WO2024113930A1

WO2024113930A1 - Battery pack and electric device

Info

Publication number: WO2024113930A1
Application number: PCT/CN2023/110472
Authority: WO
Inventors: 李坤龙; 农文彬; 王鹏飞
Original assignee: 厦门新能达科技有限公司
Priority date: 2022-11-29
Filing date: 2023-08-01
Publication date: 2024-06-06
Also published as: CN115882105A

Abstract

A battery pack and an electric device. The battery pack comprises a housing, a first battery cell assembly, a second battery cell assembly and a heat dissipation piece; the first battery cell assembly comprises a first support; the second battery cell assembly comprises a second support; the second support is connected to the first support; a gap is formed between the first battery cell assembly and the second battery cell assembly; and the heat dissipation piece is located in the gap. According to the battery pack, the first support is connected to the second support, and the heat dissipation piece is provided in the gap formed between the first battery cell assembly and the second battery cell assembly, so that the damage caused by pressing of the battery cell assemblies is reduced, thereby prolonging the service life of the battery pack.

Description

Battery packs and electrical equipment

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to Chinese patent application 202211512044.3, filed on November 29, 2022, entitled “Battery Pack and Electrical Equipment,” and the entire contents of that application are incorporated herein by reference.

Technical Field

The present application relates to the field of energy storage technology, and in particular to a battery pack and electrical equipment.

Background technique

The battery pack will generate heat during use, and a heat sink is needed to regulate the temperature. When the heat sink is set inside the battery pack shell, it is easily squeezed and damaged by the battery cell assembly, which is not conducive to the use of the battery pack.

Summary of the invention

In view of the above situation, it is necessary to provide a battery pack to reduce the damage to the heat sink in the battery pack shell due to extrusion and increase the service life of the battery pack.

An embodiment of the present application provides a battery pack, including a housing, a first battery cell assembly, a second battery cell assembly, and a heat sink. The first battery cell assembly is disposed in the housing, the first battery cell assembly includes a first battery cell and a first bracket, and the first bracket is bonded to the surface of the first battery cell. The second battery cell assembly is disposed in the housing, the first battery cell assembly and the second battery cell assembly are stacked along a first direction, the second battery cell assembly includes a second battery cell and a second bracket, the second bracket is bonded to the surface of the second battery cell, the second bracket is connected to the first bracket, and a gap is formed between the first battery cell assembly and the second battery cell assembly. The heat sink is disposed in the housing and in the gap.

The battery pack is connected via a first bracket and a second bracket, and the heat sink is disposed in a gap between the first battery cell assembly and the second battery cell assembly, which helps to reduce the risk of damage due to squeezing of the battery cell assembly.

In some embodiments of the present application, the first bracket and the second bracket are connected by abutment, which is beneficial to improve the stability of the connection between the first battery cell assembly and the second battery cell assembly and improve the vibration resistance of the battery pack.

In some embodiments of the present application, one of the first bracket and the second bracket is provided with a convex portion, and the other is provided with a concave portion, the convex portion is plugged into the concave portion, the heat sink is provided with a first through hole, and at least a portion of the convex portion and/or at least a portion of the concave portion is accommodated in the first through hole. The first bracket and the second bracket are connected in a limited position by plugging the convex portion and the concave portion into each other, which is beneficial to improving the connection stability of the first bracket and the second bracket and improving the vibration resistance of the battery pack. At least a portion of the convex portion and/or the concave portion is accommodated in the first through hole. The hole is helpful to reduce the influence of the interaction force between the first bracket and the second bracket on the heat sink, and reduce the risk of the interaction force between the first bracket and the second bracket damaging the heat sink.

In some embodiments of the present application, at least part of the protrusion is arranged in the recessed portion, so that a gap is formed between the first battery cell assembly and the second battery cell assembly; along the first direction, the length of the heat sink is less than or equal to the length of the gap, which is beneficial to further reduce the influence of the interaction force between the first bracket and the second bracket on the heat sink, and reduce the risk of damaging the heat sink by the interaction force between the first bracket and the second bracket.

In some embodiments of the present application, the first bracket covers at least part of both sides of the first battery cell along the first direction, which is conducive to protecting at least part of both sides of the first battery cell along the first direction, reducing the risk of damage to the first battery cell. The second bracket covers at least part of both sides of the second battery cell along the first direction, which is conducive to protecting at least part of both sides of the second battery cell along the first direction, reducing the risk of damage to the second battery cell.

In some embodiments of the present application, the first battery cell includes a first shell, a first electrode assembly and a first electrode terminal, the first electrode assembly is disposed inside the first shell, the first electrode terminal is connected to the first electrode assembly and extends out of the first shell, the first shell includes a first main body and a first edge sealing portion, the first edge sealing portion is connected to the first main body, the first electrode assembly is disposed inside the first main body, the first electrode terminal extends from the first edge sealing portion, and the first bracket covers at least part of the first edge sealing portion, which is beneficial to protect at least part of the first edge sealing portion and reduce the risk of damage to the first shell.

In some embodiments of the present application, the first bracket covers at least a portion of the first main body, which helps to protect at least a portion of the first main body and reduce the risk of damage to the first main body.

In some embodiments of the present application, the first edge sealing portion includes a first side sealing portion and a first top sealing portion connected to each other, the first electrode terminal extends from the first top sealing portion, and the first bracket covers at least part of the first side sealing portion and the first top sealing portion.

In some embodiments of the present application, one of the first bracket and the second bracket is provided with a convex portion, and the other is provided with a concave portion, and the convex portion is provided in the concave portion. Along the first direction, the projection of the convex portion overlaps with the projection of the first main body portion, which is beneficial to reduce the influence of the interaction force between the first bracket and the second bracket on the first top sealing portion when the first bracket is connected to the second bracket, and reduce the influence on the first electrode terminal.

In some embodiments of the present application, the heat sink is connected to the first battery cell assembly and the second battery cell assembly, which is beneficial to improve the heat dissipation of the first battery cell assembly and the second battery cell assembly and reduce the impact of heat on the first battery cell assembly and the second battery cell assembly.

In some embodiments of the present application, there are multiple first battery cell assemblies, and the multiple first battery cell assemblies are stacked along the second direction, and the second direction is perpendicular to the first direction; there are multiple second battery cell assemblies, and the multiple second battery cell assemblies are stacked along the second direction; along the first direction, a first battery cell assembly and a second battery cell assembly are arranged, and the first bracket of the first battery cell assembly is connected to the second bracket of the second battery cell assembly.

In some embodiments of the present application, along the second direction, two adjacent first brackets are connected to each other, and/or two adjacent second brackets are connected to each other, which is beneficial to improving the stability of the connection between adjacent first brackets and/or second brackets, and further improving the seismic performance.

In some embodiments of the present application, the first bracket further includes a first stopper and a second stopper. The first stopper and the second stopper are respectively located on both sides of the first bracket along the second direction, the second direction is perpendicular to the first direction, and the first stopper and the second stopper are respectively extended outwardly away from each other along the second direction; along the second direction, two adjacent first brackets are abutted by the first stopper and/or the second stopper, which is beneficial to improve the stability of the connection between the two adjacent first battery core assemblies and further improve the anti-seismic performance. The second bracket also includes a third stopper and a fourth stopper, the third stopper and the fourth stopper are respectively located on both sides of the second bracket along the second direction, and the third stopper and the fourth stopper are respectively extended outwardly away from each other along the second direction; along the second direction, two adjacent second brackets are abutted by the third stopper and/or the fourth stopper, which is beneficial to improve the stability of the connection between the two adjacent second battery core assemblies and further improve the anti-seismic performance.

In some embodiments of the present application, the first stop portion is provided with a first opening, and when observed along the third direction, at least a portion of the first opening is exposed to the second stop portion, and the first opening is allowed to pass through by a coolant to form a heat dissipation channel, which is beneficial to heat dissipation; and/or, the second stop portion is provided with a second opening, and when observed along the third direction, at least a portion of the second opening is exposed to the first stop portion, and the second opening is allowed to pass through by a coolant to form a heat dissipation channel, which is beneficial to heat dissipation.

In some embodiments of the present application, a first battery cell includes a first shell, a first electrode terminal and a third electrode terminal, and the first electrode terminal and the third electrode terminal extend from opposite sides of the first shell to the first shell respectively; a first battery cell assembly includes a plurality of first batteries, and the plurality of first batteries are arranged along a third direction, and in two adjacent first batteries along the third direction, the first electrode terminal of one first battery cell and the third electrode terminal of another first battery cell are connected to form a first connection area, and the first bracket covers at least part of the first connection area and at least part of the first shell of the two adjacent first batteries, and the third direction is perpendicular to the first direction. A second battery cell includes a second shell, a second electrode terminal and a fourth electrode terminal, and the second electrode terminal and the fourth electrode terminal extend from opposite sides of the second shell to the second shell respectively; a second battery cell assembly includes a plurality of second batteries, and the plurality of second batteries are arranged along a third direction, and in two adjacent second batteries along the third direction, the second electrode terminal of one second battery cell and the fourth electrode terminal of another second battery cell are connected to form a second connection area, and the second bracket covers at least part of the second connection area and at least part of the second shell of the two adjacent second batteries. The first bracket covers a portion of the first connection region to form a first channel penetrating along the first direction, and/or the second bracket covers a portion of the second connection region to form a second channel penetrating along the first direction.

The first channel and the second channel are beneficial to increasing the surface area of the first bracket and the second bracket, increasing the heat dissipation area, and also forming a heat dissipation channel for the coolant to pass through, thereby improving the heat dissipation of the first battery cell assembly and the second battery cell assembly.

In some embodiments of the present application, the housing is provided with a second through hole and a third through hole; the first channel is connected to the second through hole and the third through hole, and/or the second channel is connected to the second through hole and the third through hole. The coolant outside the battery pack passes through the first channel and/or the second channel through the second through hole and the three through holes, further improving the heat dissipation effect of the first bracket and/or the second bracket, and improving the heat dissipation of the first battery cell assembly and the second battery cell assembly.

In some embodiments of the present application, the first bracket is formed on at least a portion of the surface of the first battery cell by a perfusion process, and/or the second bracket is formed on at least a portion of the surface of the second battery cell by a perfusion process. surface.

An embodiment of the present application further provides an electrical device, comprising the battery pack described in any of the above embodiments.

In the above-mentioned electrical equipment, the first battery cell assembly and the second battery cell assembly form a gap, and the heat sink is arranged in the gap, which is beneficial to reduce the damage to the heat sink between the first battery cell assembly and the second battery cell assembly due to extrusion, and is beneficial to increase the service life of the battery pack and reduce the impact of the battery pack service life on the electrical equipment.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of the structure of a battery pack in one embodiment of the present application.

FIG. 2 is an exploded view of the battery pack shown in FIG. 1 .

FIG. 3 is a first view of a stack of a first battery cell assembly, a second battery cell assembly, and a heat sink in one embodiment of the present application.

FIG. 4 is a schematic diagram of the structure of a first battery cell in an embodiment of the present application.

FIG. 5 is a schematic structural diagram of a plurality of first battery cells arranged along a third direction in one embodiment of the present application.

FIG. 6 is a schematic structural diagram of a first bracket covering a portion of the surface of the structure shown in FIG. 5 in one embodiment of the present application.

FIG. 7 is a schematic structural diagram of an extended embodiment of the structure shown in FIG. 5 .

FIG8 is a schematic structural diagram of a first bracket covering a portion of the surface of the structure shown in FIG7 in one embodiment of the present application.

FIG. 9 is a schematic diagram of the structure of a second battery cell in an embodiment of the present application.

FIG. 10 is a schematic structural diagram of a plurality of second battery cells arranged along a third direction in one embodiment of the present application.

FIG. 11 is a schematic structural diagram of a second bracket covering a portion of the surface of the structure shown in FIG. 10 in one embodiment of the present application.

FIG. 12 is a schematic structural diagram of an extended embodiment of the structure shown in FIG. 10 .

FIG. 13 is a schematic structural diagram of a second bracket covering a portion of the surface of the structure shown in FIG. 12 in one embodiment of the present application.

FIG. 14 is a second view of the stacking of the first battery cell assembly, the second battery cell assembly, and the heat sink in one embodiment of the present application.

FIG. 15 is a partial enlarged view of the XV region in FIG. 14 .

FIG. 16 is an exploded view of a first battery cell assembly, a second battery cell assembly, and a heat sink in one embodiment of the present application.

FIG. 17 is another view of the exploded view shown in FIG. 16 .

FIG. 18 is a partial enlarged view of the XVIII region in FIG. 16 .

FIG. 19 is a schematic structural diagram of an extended embodiment of the structure shown in FIG. 18 .

FIG. 20 is a schematic structural diagram of an extended embodiment of the structure shown in FIG. 18 .

FIG. 21 is a schematic structural diagram of an extended embodiment of the structure shown in FIG. 18 .

FIG. 22 is a partial enlarged view of the area XXII in FIG. 16 .

FIG. 23 is a schematic structural diagram of an extended embodiment of the structure shown in FIG. 22 .

FIG. 24 is a schematic structural diagram of an extended embodiment of the structure shown in FIG. 22 .

FIG. 25 is a schematic structural diagram of an extended embodiment of the structure shown in FIG. 22 .

FIG. 26 is a schematic diagram of the structure of an electrical device in one embodiment of the present application.

Main Component Symbols Description Battery Pack 100
Housing 10
First Wall 11
Second through hole 111
Second Wall 12
The third through hole 121
Third Wall 13
The Fourth Wall 14
Fifth Wall 15
The Sixth Wall 16
First battery cell assembly 20
First cell 21
First housing 211
First body part 2111
First edge sealing 2112
First side seal 21121
First top seal 21122
First electrode terminal 212
Third electrode terminal 213
First connection area 214
First bracket 22
First side 221
First convex part 222
First concave portion 223
Third convex part 224
The third recess 225
First stopper 226
First Opening 2261
Second stopper 227
Second opening 2271
First channel 228
Second battery cell assembly 30
Second cell 31
Second housing 311
Second main body 3111
Second edge sealing part 3112
Second side seal 31121
Second top seal 31122
Second electrode terminal 312
Fourth electrode terminal 313
Second connection area 314
Second bracket 32
Second side 321
Second concave portion 322
Second convex part 323
Fourth concave portion 324
Fourth convex part 325
Third stopper 326
The third opening 3261
Fourth stopper 327
Fourth Opening 3271
Second channel 328
Heat sink 40
First surface 41
Second surface 42
First through hole 43
First Area 44
Second area 45
First heat conducting member 51
Second heat conducting member 52
Connection kit 70
First connection terminal 81
Second connection terminal 82
Gap 91
Electrical equipment 200
First direction Z
Second direction X
The third direction Y

The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings.

Detailed ways

The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be a centrally disposed element at the same time. When an element is considered to be "disposed on" another element, it may be directly disposed on the other element or there may be a centrally disposed element at the same time.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which the present application belongs. The terms used herein in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and/or" used herein includes any and all combinations of one or more related listed items.

An embodiment of the present application provides a battery pack, including a housing, a first battery cell assembly, a second battery cell assembly, and a heat sink. The first battery cell assembly is disposed in the housing, the first battery cell assembly includes a first battery cell and a first bracket, and the first bracket is bonded to the surface of the first battery cell. The second battery cell assembly is disposed in the housing, the first battery cell assembly and the second battery cell assembly are stacked along a first direction, the second battery cell assembly includes a second battery cell and a second bracket, the second bracket is bonded to the surface of the second battery cell, the second bracket is connected to the first bracket, and a gap is formed between the first battery cell and the second battery cell. The heat sink is disposed in the housing and in the gap.

The battery pack is connected via a first bracket and a second bracket, and the heat sink is disposed in a gap between the first battery cell assembly and the second battery cell assembly, which helps to reduce damage to the heat sink caused by squeezing of the battery cell assembly and improve the service life of the battery pack.

The embodiments of the present application are further described below in conjunction with the accompanying drawings.

As shown in Figures 1, 2 and 3, an embodiment of the present application provides a battery pack 100, including a shell 10, a first battery cell assembly 20, a second battery cell assembly 30, a heat sink 40 and a circuit board (not shown), the first battery cell assembly 20, the second battery cell assembly 30, the heat sink 40 and the circuit board are arranged in the shell 10, the second battery cell assembly 30 and the first battery cell assembly 20 are stacked along a first direction Z, and the first battery cell assembly 20 and the second battery cell assembly 30 are both connected to the circuit board.

In one embodiment, the circuit board controls the charging and discharging of the first battery cell assembly 20 and the second battery cell assembly 30. In one embodiment, the circuit board includes a BMS assembly (Battery Management System), and the BMS assembly includes a plurality of electronic components, which realize functions such as data collection, control, protection, communication, power calculation, signal transmission, and power transmission of the battery cells.

The first battery cell assembly 20 includes a first battery cell 21 and a first bracket 22 . The first bracket 22 is bonded to at least a portion of the surface of the first battery cell 21 .

The second battery cell assembly 30 includes a second battery cell 31 and a second bracket 32. The second bracket 32 is bonded to at least a portion of the surface of the second battery cell 31. The second bracket 32 is connected to the first bracket 22. A gap 91 is formed between the component 20 and the second battery cell assembly 30 , and the heat dissipation component 40 is disposed in the gap 91 .

The battery pack 100 is connected by the first bracket 22 and the second bracket 32. The heat sink 40 is disposed in the gap 91 between the first battery cell assembly 20 and the second battery cell assembly 30, which is beneficial to reduce the damage of the heat sink 40 caused by the extrusion of the battery cell assembly and improve the service life of the battery pack. The heat sink 40 is beneficial to improve the heat dissipation of the first battery cell assembly 20 and the second battery cell assembly 30, and reduce the influence of heat on the first battery cell assembly 20 and the second battery cell assembly 30.

In one embodiment, the first bracket 22 is formed on the surface of the first battery cell 21 by a potting process.

The infusion process may include at least one of an injection molding process and a glue potting process.

Taking the injection molding process as an example, the injection molding material (such as an insulating material) can be melted by an injection molding device so that the melted injection molding material covers the surface of the first battery cell 21 . After the injection molding material is solidified, the first bracket 22 is formed, thereby the first bracket 22 is formed on the surface of the first battery cell 21 .

Taking the glue pouring process as an example, the insulating material (such as a flowable insulating material) is used to cover the surface of the first battery cell 21 , and the insulating material is solidified to form the first bracket 22 , thereby the first bracket 22 is formed on the surface of the first battery cell 21 .

In one embodiment, the first bracket 22 is formed on the surface of the first battery cell 21 by an injection molding process, and the first bracket 22 is bonded to the first battery cell 21 , which is beneficial to improve the stability of the first bracket 22 connecting to the first battery cell 21 .

In one embodiment, the first bracket 22 is formed on a portion of the surface of the first battery cell 21 by glue injection, and the first bracket 22 is bonded to the first battery cell 21 , which is beneficial to improve the stability of the first bracket 22 connecting to the first battery cell 21 .

In one embodiment, the first bracket 22 is made of a plastic material with good thermal conductivity, which can help the first battery cell 21 to dissipate its own heat and improve the heat dissipation of the first battery cell 21. In one embodiment, the material selected for the first bracket 22 is a mixture, which is formed by filling a thermally conductive filler in a polymer matrix material. Optionally, the polymer matrix material includes but is not limited to any one of polyphenylene sulfide (PPS), nylon, synthetic rubber (TPE), polycarbonate (PC), polypropylene (PP), polyphthalamide (PPA) and polyetheretherketone (PEEK), and the thermally conductive filler includes but is not limited to any one of silicon carbide, aluminum oxide, graphite, fibrous high thermal conductivity carbon powder and flaky high thermal conductivity carbon powder.

In one embodiment, the second bracket 32 is formed on the surface of the second battery cell 31 by a potting process.

In one embodiment, the second bracket 32 is injection molded on the surface of the second battery cell 31 , and the second bracket 32 is bonded to the second battery cell 31 , which helps to improve the stability of the second bracket 32 connecting to the second battery cell 31 .

In one embodiment, the second bracket 32 is formed on a portion of the surface of the second battery cell 31 by glue injection, and the second bracket 32 is bonded to the second battery cell 31 , which is beneficial to improve the stability of the second bracket 32 connecting the second battery cell 31 .

In one embodiment, the second bracket 32 is made of a plastic material with good thermal conductivity, which can help the second battery cell 31 to dissipate its own heat and improve the heat dissipation rate of the second battery cell 31. In one embodiment, the material used for the second bracket 32 is a mixture, which is formed by filling a thermal conductive filler in a polymer matrix material. Optionally, the polymer matrix material includes but is not limited to polyphenylene sulfide (PPS), Any one of nylon, synthetic rubber (TPE), polycarbonate (PC), polypropylene (PP), polyphthalamide (PPA) and polyetheretherketone (PEEK), and the thermal conductive filler includes but is not limited to any one of silicon carbide, alumina, graphite, fibrous high thermal conductive carbon powder and flaky high thermal conductive carbon powder.

In one embodiment, the first bracket 22 and the second bracket 32 are connected to each other. In one embodiment, the first bracket 22 and the second bracket 32 are connected by abutment along the first direction Z, so that the first battery cell assembly 20 and the second battery cell assembly 30 form a gap 91, which is beneficial to reduce the damage of the heat sink 40 between the first battery cell assembly 20 and the second battery cell assembly 30 due to the extrusion of the battery cell assembly, thereby improving the service life of the battery pack.

In one embodiment, a portion of the gap 91 is located between the first bracket 22 and the second bracket 32 .

In one embodiment, the heat sink 40 connects the first battery cell assembly 20 and the second battery cell assembly 30 , which is beneficial to improve the heat dissipation of the first battery cell assembly 20 and the second battery cell assembly 30 and reduce the impact of heat on the first battery cell assembly 20 and the second battery cell assembly 30 .

In one embodiment, the heat sink 40 includes a first surface 41 and a second surface 42, the first surface 41 and the second surface 42 are respectively located on two opposite sides of the heat sink 40 along the first direction Z, the first surface 41 faces the first battery cell assembly 20, and the second surface 42 faces the second battery cell assembly 30. In one embodiment, the first surface 41 is connected to the first battery cell assembly 20. In one embodiment, the second surface 42 is connected to the second battery cell assembly 30.

The heat sink 40 is disposed between the first battery cell assembly 20 and the second battery cell assembly 30, which is conducive to absorbing the heat transferred from the first battery cell assembly 20 and the second battery cell assembly 30, accelerating the heat dissipation of the first battery cell assembly 20 and the second battery cell assembly 30, and reducing the influence of heat on the performance of the first battery cell assembly 20 and the second battery cell assembly 30. In addition, the first battery cell assembly 20 and the second battery cell assembly 30 are connected to each other by the first bracket 22 and the second bracket 32 to support and fix each other, and the heat sink 40 is disposed between the first battery cell assembly 20 and the second battery cell assembly 30, which is conducive to reducing the risk of the interaction force between the first bracket 22 and the second bracket 32 to the heat sink 40.

In one embodiment, the housing 10 includes a first wall 11, a second wall 12, a third wall 13, a fourth wall 14, a fifth wall 15 and a sixth wall 16. The first wall 11 and the second wall 12 are arranged in an array, the third wall 13 and the fourth wall 14 are arranged in an array, the fifth wall 15 and the sixth wall 16 are arranged in an array, and the fifth wall 15 and the sixth wall 16 are both connected to the first wall 11, the second wall 12, the third wall 13 and the fourth wall 14. The first wall 11, the second wall 12, the third wall 13, the fourth wall 14, the fifth wall 15 and the sixth wall 16 are arranged to form a cavity space for accommodating the first battery cell assembly 20, the second battery cell assembly 30, the heat sink 40 and the circuit board.

In order to better illustrate the structure of the battery pack 100, the structure of the battery pack 100 will be described in combination with X, Y, and Z coordinate axes. The X, Y, and Z coordinate axes are perpendicular to each other, and the Z direction is defined as the first direction, the X direction is the second direction, and the Y direction is the third direction. The first direction Z is the direction in which the first wall 11 and the second wall 12 are arranged, the second direction X is the direction in which the third wall 13 and the fourth wall 14 are arranged, and the third direction Y is the direction in which the fifth wall 15 and the sixth wall 16 are arranged.

In one embodiment, the first battery cell 21 and the second battery cell 31 are soft-pack battery cells, and the first battery cell 21 and the second battery cell 31 are connected by the first bracket 22 and the second bracket 32 to achieve position limiting and protection, which is beneficial to reduce the amount of fillers and reduce the cost of the battery pack 100. The second battery cell 31 may also be a hard shell battery cell (not shown).

For ease of understanding and description, the battery cells described in this application are further explained by taking soft-pack battery cells as an example.

In one embodiment, the heat sink 40 includes any one of a liquid cooling plate and an air cooling plate.

As shown in FIG. 4 , in one embodiment, the first battery cell 21 includes a first shell 211 , a first electrode assembly (not shown), a first electrode terminal 212 and a third electrode terminal 213 . The first electrode assembly is disposed inside the first shell 211 , and the first electrode terminal 212 and the third electrode terminal 213 are both connected to the first electrode assembly and extend out of the first shell 211 .

One of the first electrode terminal 212 and the third electrode terminal 213 is a positive electrode terminal, and the other of the first electrode terminal 212 and the third electrode terminal 213 is a negative electrode terminal.

In one embodiment, the first electrode assembly includes a positive electrode sheet, a negative electrode sheet and a separator, the separator is arranged between the positive electrode sheet and the negative electrode sheet, the positive electrode sheet, the separator and the negative electrode sheet are wound or stacked to form the first electrode assembly, the first electrode terminal 212 is connected to the positive electrode sheet, and the third electrode terminal 213 is connected to the negative electrode sheet.

In one embodiment, the first housing 211 includes a first main body 2111 and a first edge sealing portion 2112, the first edge sealing portion 2112 is connected to the first main body 2111 and extends from the first main body 2111, the first electrode assembly is disposed inside the first main body 2111, and the first electrode terminal 212 and the third electrode terminal 213 extend from the first edge sealing portion 2112. In one embodiment, the first edge sealing portion 2112 includes a first side sealing portion 21121 and a first top sealing portion 21122 connected to each other, and the first electrode terminal 212 and the third electrode terminal 213 extend from the first top sealing portion 21122.

In one embodiment, the first electrode terminal 212 and the third electrode terminal 213 are respectively located at opposite ends of the first main body 2111. There are two first top seals 21122, and two first side seals 21121. The two first top seals 21122 are respectively located at opposite sides of the first main body 2111, and the two first side seals 21121 are respectively located at opposite sides of the first main body 2111. Each first top seal 21122 is connected to two first side seals 21121, and the first electrode terminal 212 and the third electrode terminal 213 extend from the two first top seals 21122. In other embodiments, the first electrode terminal 212 and the third electrode terminal 213 are located on the same side of the first main body 2111 (not shown).

As shown in FIG. 5 and FIG. 6 , in one embodiment, the number of the first battery cells 21 in the first battery cell assembly 20 is multiple, and the multiple first battery cells 21 are arranged along the third direction Y, and two adjacent first battery cells 21 along the third direction Y are connected to each other. In one embodiment, the number of the first battery cells 21 arranged along the third direction Y in the first battery cell assembly 20 is two, three, four or more.

As an example, the following further describes the example in which the number of the first battery cells 21 arranged along the third direction Y in the first battery cell assembly 20 is three.

In one embodiment, three first battery cells 21 arranged along the third direction Y are sequentially connected in series, and the first electrode terminal 212 of one first battery cell 21 is connected to the third electrode terminal 213 of the adjacent first battery cell 21. Optionally, the first electrode terminal 212 and the third electrode terminal 213 are in contact and connected to form a first connection region 214.

In one embodiment, the first bracket 22 covers a portion of the surface of the first electrode terminal 212 and a portion of the surface of the first shell 211, so that the first electrode terminal 212 is stably connected to the first shell 211, and The number of supports for the first electrode terminal 212 can be reduced. Optionally, the first bracket 22 completely covers the first top seal portion 21122 connected to the first electrode terminal 212, and covers a portion of the first body portion 2111 and a portion of the first side seal portion 21121, which is conducive to further improving the stability of the first bracket 22 connected to the first shell 211 and reducing the risk of damage to the first electrode terminal 212.

In one embodiment, the first bracket 22 covers a portion of the surface of the third electrode terminal 213 and a portion of the surface of the first housing 211, so that the third electrode terminal 213 is stably connected to the first housing 211, and the number of supports for the third electrode terminal 213 can be reduced. Optionally, the first bracket 22 completely covers the first top seal portion 21122 connected to the third electrode terminal 213, and covers a portion of the first body portion 2111 and a portion of the first side seal portion 21121, which is conducive to further improving the stability of the first bracket 22 connected to the first housing 211 and reducing the risk of damage to the first electrode terminal 212.

In one embodiment, the first bracket 22 covers a portion of the first electrode terminal 212 located outside the first shell 211 , and the first bracket 22 covers a portion of the third electrode terminal 213 located outside the first shell 211 .

In one embodiment, the first bracket 22 covers at least part of the surface of the first connection area 214 and at least part of the surface of the two first shells 211 on both sides of the first connection area 214, so that the first electrode terminal 212 and the third electrode terminal 213 are stably connected to each other and stably connected to the first shell 211, which is conducive to reducing the number of supports for the first electrode terminal 212 and the third electrode terminal 213 and improving the stability of the connection between the first electrode terminal 212 and the third electrode terminal 213. Optionally, the first bracket 22 completely covers the surface of the first connection area 214 and covers the first top seals 21122 located on both sides of the first connection area 214, which is conducive to further improving the stability of the first bracket 22 connecting the first shell 211 and reducing the risk of damage to the first electrode terminal 212 and the third electrode terminal 213.

In one embodiment, the first bracket 22 is formed on the surface of one or more first battery cells 21 at one time to form a first battery cell assembly 20. In one embodiment, the first bracket 22 is formed on at least a portion of the surface of one or more first battery cells 21 by a perfusion process, and the first bracket 22 and the one or more first battery cells 21 form an assembly, and multiple assemblies are again connected to each other by a perfusion process to form the first battery cell assembly 20.

In one embodiment, the first bracket 22 completely covers the first shell 211 (not shown). The first bracket 22 can play a protective role, reduce the risk of the first shell 211 being damaged by foreign objects, and improve the safety performance of the battery pack 100.

As an example, the first bracket 22 covers the portion of the first shell 211, the first bracket 22 covers the portion of the first electrode terminal 212 located outside the first shell 211, and the first bracket 22 covers the portion of the third electrode terminal 213 located outside the first shell 211 as examples for further description.

As shown in FIG. 7 and FIG. 8 , in one embodiment, a plurality of first battery cells 21 are arranged along the second direction X. In one embodiment, along the second direction X, two adjacent first battery cells 21 are in contact and connected.

In one embodiment, the number of the first battery cells 21 arranged along the second direction X is two, three, four or more.

As an example, the following further describes the example where the number of the first battery cells 21 arranged along the second direction X is three.

It can be understood that in the first battery cell assembly 20, there are three first battery cells 21 along the third direction Y. Arranged, three first battery cells 21 are arranged along the second direction X, and the total number of the first battery cells 21 is nine.

In one embodiment, three first battery cells 21 arranged along the second direction X are connected in parallel with each other, wherein three first electrode terminals 212 are located on the same side of the three first battery cells 21 and are connected to each other to form a parallel terminal, and three third electrode terminals 213 are located on the other side of the three first battery cells 21 and are connected to each other to form another parallel terminal, and the two parallel terminals are connected to form a first connection area 214.

As shown in Figure 9, in one embodiment, the second battery cell 31 includes a second shell 311, a second electrode assembly (not shown), a second electrode terminal 312 and a fourth electrode terminal 313. The second electrode assembly is disposed inside the second shell 311, and the second electrode terminal 312 and the fourth electrode terminal 313 are connected to the second electrode assembly and extend out of the second shell 311.

In one embodiment, one of the second electrode terminal 312 and the fourth electrode terminal 313 is a positive electrode terminal, and the other of the second electrode terminal 312 and the fourth electrode terminal 313 is a negative electrode terminal.

In one embodiment, the second housing 311 includes a second main body 3111 and a second edge seal 3112, the second edge seal 3112 is connected to the second main body 3111 and extends from the second main body 3111, the second electrode assembly is disposed inside the second main body 3111, and the second electrode terminal 312 and the fourth electrode terminal 313 extend from the second edge seal 3112. In one embodiment, the second edge seal 3112 includes a second side seal 31121 and a second top seal 31122 connected to each other, and the second electrode terminal 312 and the fourth electrode terminal 313 extend from the second top seal 31122.

In one embodiment, the second electrode terminal 312 and the fourth electrode terminal 313 are respectively located at opposite ends of the second main body 3111. There are two second top seals 31122, and two second side seals 31121. The two second top seals 31122 are respectively located at opposite sides of the second main body 3111, and the two second side seals 31121 are respectively located at opposite sides of the second main body 3111. Each second top seal 31122 is connected to two second side seals 31121, and the second electrode terminal 312 and the fourth electrode terminal 313 extend from the two second top seals 31122. In other embodiments, the second electrode terminal 312 and the fourth electrode terminal 313 are located on the same side of the first main body 2111 (not shown).

As an example, the following further describes that the first electrode terminal 212 and the third electrode terminal 213 are respectively located at two opposite ends of the first battery cell 21 , and the second electrode terminal 312 and the fourth electrode terminal 313 are respectively located at two opposite ends of the second battery cell 31 .

As shown in FIGS. 10 and 11 , in one embodiment, the number of the second battery cells 31 in the second battery cell assembly 30 is multiple, and the multiple second battery cells 31 are arranged along the third direction Y, and two second battery cells 31 adjacent to each other along the third direction Y are connected to each other. In one embodiment, the number of the second battery cells 31 arranged along the third direction Y in the second battery cell assembly 30 is two, three, four or more.

As an example, the following further describes the example in which the number of the second battery cells 31 arranged along the third direction Y in the second battery cell assembly 30 is three.

In one embodiment, three second battery cells 31 arranged along the third direction Y are sequentially connected in series, and the second electrode terminal 312 of one second battery cell 31 is connected to the fourth electrode terminal 313 of the adjacent second battery cell 31. Optionally, the second electrode terminal 312 and the fourth electrode terminal 313 are in contact and connected to form Second connection region 314 .

In one embodiment, the second bracket 32 covers a portion of the surface of the second electrode terminal 312 and a portion of the surface of the second housing 311, so that the second electrode terminal 312 is stably connected to the second housing 311, and the number of supports at the second electrode terminal 312 can be reduced. Optionally, the second bracket 32 completely covers the second top seal portion 31122 connected to the second electrode terminal 312, and covers a portion of the second body portion 3111 and a portion of the second side seal portion 31121, which is conducive to further improving the stability of the second bracket 32 connected to the second housing 311 and reducing the risk of damage to the second electrode terminal 312.

In one embodiment, the second bracket 32 covers a portion of the surface of the fourth electrode terminal 313 and a portion of the surface of the second housing 311, so that the fourth electrode terminal 313 is stably connected to the second housing 311, and the number of supports at the fourth electrode terminal 313 can be reduced. Optionally, the second bracket 32 completely covers the second top seal portion 31122 connected to the fourth electrode terminal 313, and covers a portion of the second body portion 3111 and a portion of the second side seal portion 31121, which is conducive to further improving the stability of the second bracket 32 connected to the second housing 311 and reducing the risk of damage to the fourth electrode terminal 313.

In one embodiment, the second bracket 32 covers the portion of the second electrode terminal 312 located outside the second shell 311 , and the second bracket 32 covers the portion of the fourth electrode terminal 313 located outside the second shell 311 .

In one embodiment, the second bracket 32 covers at least part of the surface of the second connection area 314 and at least part of the surface of the two second shells 311 on both sides of the second connection area 314, so that the second electrode terminal 312 and the fourth electrode terminal 313 are stably connected to each other and stably connected to the second shell 311, which is conducive to reducing the number of supports for the second electrode terminal 312 and the fourth electrode terminal 313 and improving the stability of the connection between the second electrode terminal 312 and the fourth electrode terminal 313. Optionally, the second bracket 32 completely covers the surface of the second connection area 314 and covers the second top seals 31122 located on both sides of the second connection area 314, which is conducive to further improving the stability of the second bracket 32 connecting the second shell 311 and reducing the risk of damage to the second electrode terminal 312 and the fourth electrode terminal 313.

In one embodiment, the second bracket 32 is formed on the surface of one or more second battery cells 31 at one time to form a second battery cell assembly 30. In one embodiment, the second bracket 32 is formed on at least part of the surface of one or more second battery cells 31 by a perfusion process, and the second bracket 32 and one or more second battery cells 31 form an assembly, and multiple assemblies are again connected to each other by a perfusion process to form the second battery cell assembly 30.

In one embodiment, the second bracket 32 completely covers the second shell 311 (not shown). The second bracket 32 can play a protective role, reduce the risk of the second shell 311 being damaged by foreign objects, and improve the safety performance of the battery pack 100.

As an example, the second bracket 32 covers the portion of the second shell 311, the second bracket 32 covers the portion of the second electrode terminal 312 outside the second shell 311, and the second bracket 32 covers the portion of the fourth electrode terminal 313 outside the second shell 311. This is further described below.

As shown in FIG. 12 and FIG. 13 , in one embodiment, a plurality of second battery cells 31 are arranged along the second direction X. In one embodiment, along the second direction X, two adjacent second battery cells 31 are in contact and connected.

In one embodiment, the number of the second battery cells 31 arranged along the second direction X is two, three, four or more.

As an example, the following further describes the example where the number of the second battery cells 31 arranged along the second direction X is three.

It can be understood that, in the second battery cell assembly 30 , three second battery cells 31 are arranged along the third direction Y, and three second battery cells 31 are arranged along the second direction X, and the total number of the second battery cells 31 is nine.

In one embodiment, three second battery cells 31 arranged along the second direction X are connected in parallel with each other, wherein three second electrode terminals 312 are located on the same side of the three second battery cells 31 and are connected to each other to form a parallel terminal, and three fourth electrode terminals 313 are located on the other side of the three second battery cells 31 and are connected to each other to form another parallel terminal, and the two parallel terminals are connected to form a second connection area 314.

Please refer to FIG. 2 and FIG. 3 . In one embodiment, there are a plurality of first battery cell assemblies 20 , and the plurality of first battery cell assemblies 20 are arranged along the second direction X. In one embodiment, there are a plurality of second battery cell assemblies 30 , and the plurality of second battery cell assemblies 30 are arranged along the second direction X. The heat sink 40 is disposed between the plurality of first battery cell assemblies 20 and the plurality of second battery cell assemblies 30 . The heat sink 40 absorbs the heat transferred from the plurality of first battery cell assemblies 20 and the plurality of second battery cell assemblies 30 , which is beneficial to accelerate the heat dissipation of the first battery cell assemblies 20 and the plurality of second battery cell assemblies 30 , and reduce the influence of heat on the performance of the first battery cell assemblies 20 and the plurality of second battery cell assemblies 30 .

Along the first direction Z, the first battery cell assembly 20 and the second battery cell assembly 30 correspond to each other and are stacked and connected, and one first battery cell assembly 20 and one second battery cell assembly 30 are stacked and connected. Along the first direction Z, in the first battery cell assembly 20 and the second battery cell assembly 30 corresponding to each other, the first bracket 22 of the first battery cell assembly 20 is connected to the second bracket 32 of the second battery cell assembly 30, so that the first battery cell assembly 20 and the second battery cell assembly 30 support each other and limit each other, so that the first battery cell 21 and the second battery cell 31 are spaced apart along the first direction Z.

As shown in FIG. 14 and FIG. 15 , in one embodiment, a first battery cell assembly 20 and a second battery cell assembly 30 connected to each other constitute an assembly, and a plurality of assemblies are arranged along the second direction X, and the gaps 91 of the plurality of assemblies are connected to each other.

In one embodiment, taking the first battery cell assembly 20 and the second battery cell assembly 30 corresponding to each other and stacked and connected along the first direction Z as an example, the first bracket 22 of the first battery cell assembly 20 and the second bracket 32 of the second battery cell assembly 30 abut against each other and support and limit each other.

In one embodiment, one of the first bracket 22 of the first battery cell assembly 20 and the second bracket 32 of the second battery cell assembly 30 is provided with a protrusion, and the other of the first bracket 22 and the second bracket 32 is provided with a recess, and at least part of the protrusion is provided in the recess, so that the first bracket 22 and the second bracket 32 are connected to each other to support the limit.

In one embodiment, the first bracket 22 includes a first side surface 221 and a first protrusion 222. Along the first direction Z, the first side surface 221 faces the second bracket 32, and the first protrusion 222 extends from the first side surface 221. The second bracket 32 includes a second side surface 321 and a second recess 322. Along the first direction Z, the second side surface 321 and the first side surface 221 face each other, the second recess 322 is provided on the second side surface 321, the opening of the second recess 322 faces the first side surface 221, and at least a portion of the first protrusion 222 is provided in the second recess 322, so that the first bracket 22 and the second bracket 32 are connected to each other along the first direction Z to support and limit, forming an interval. Gap 91.

In one embodiment, along the first direction Z, the minimum length of the gap 91 is L1, and the maximum length of the heat sink 40 is L2, satisfying L2≤L1, which can reduce the influence of the interaction force between the first bracket 22 and the second bracket 32 on the heat sink 40, and reduce the risk of damaging the heat sink 40 by the interaction force between the first bracket 22 and the second bracket 32. Optionally, L2＝L1. Optionally, L2＜L1.

In one embodiment, the first bracket 22 includes a first recess 223, which is disposed on the first side surface 221, and an opening of the first recess 223 faces the second side surface 321 along the first direction Z. The second bracket 32 includes a second protrusion 323, which is disposed on the second side surface 321 and extends out of the second side surface 321. A portion of the second protrusion 323 is disposed in the first recess 223.

In one embodiment, the first bracket 22 further includes a third protrusion 224, and the third protrusion 224 and the first protrusion 222 are respectively disposed at two opposite ends of the first bracket 22 along the first direction Z, and the extension direction of the third protrusion 224 is opposite to the extension direction of the first protrusion 222. In one embodiment, the first bracket 22 further includes a third recess 225, and the third recess 225 and the first recess 223 are respectively disposed at two opposite ends of the first bracket 22 along the first direction Z.

Both ends of the first bracket 22 along the first direction Z are provided with convex parts or concave parts. When assembling the first battery cell assembly 20 and the second battery cell assembly 30, both ends of the first battery cell assembly 20 along the first direction Z can be connected to the second battery cell assembly 30, which is conducive to improving the assembly efficiency of the connection between the first battery cell assembly 20 and the second battery cell assembly 30. In addition, other battery cell assemblies can be stacked on the side of the first battery cell assembly 20 away from the second battery cell assembly 30 to increase the capacity of the battery pack 100.

In one embodiment, the second bracket 32 further includes a fourth recess 324, and the fourth recess 324 and the second recess 322 are respectively disposed at two opposite ends of the second bracket 32 along the first direction Z. In one embodiment, the second bracket 32 further includes a fourth protrusion 325, and the fourth protrusion 325 and the second recess 322 are respectively disposed at two opposite ends of the second bracket 32 along the first direction Z.

Both ends of the second bracket 32 along the first direction Z are provided with convex parts or concave parts. When assembling the first battery cell assembly 20 and the second battery cell assembly 30, both ends of the second battery cell assembly 30 along the first direction Z can be connected to the first battery cell assembly 20, which is conducive to improving the assembly efficiency of the second battery cell assembly 30 and the first battery cell assembly 20. In addition, other battery cell assemblies can be stacked on the side of the second battery cell assembly 30 away from the first battery cell assembly 20 to increase the capacity of the battery pack 100.

Please refer to FIG. 14, FIG. 15, FIG. 16 and FIG. 17 in combination. In one embodiment, along the first direction Z, the projections of all the first battery cells 21 overlap with the projections of the heat sink 40. Part of the heat on all the first battery cells 21 can be transferred out through the heat sink 40, which can improve the heat dissipation of the battery pack 100, and is conducive to reducing the temperature difference between different first battery cell components 20, and reducing the impact of heat on the battery pack 100. In one embodiment, along the first direction Z, the projections of all the first shells 211 are located within the projection of the heat sink 40.

In one embodiment, the projections of all the second battery cells 31 overlap with the projections of the heat sink 40, and part of the heat on all the second battery cells 31 can be transferred out through the heat sink 40, which can improve the heat dissipation of the battery pack 100 and help reduce the temperature difference between different second battery cell components 30, thereby reducing the impact of heat on the battery pack 100. In one embodiment, along the first direction Z, all the second shells 311 The projections of are all located within the projection of the heat sink 40.

In one embodiment, a first through hole 43 is provided on the heat sink 40, which passes through the first direction Z. The first through hole 43 passes through the first surface 41 and the second surface 42. A portion of the first protrusion 222 and/or a portion of the second recess 322 is accommodated in the first through hole 43, which can reduce the influence of the interaction force between the first bracket 22 and the second bracket 32 on the heat sink 40, and reduce the risk of the interaction force between the first bracket 22 and the second bracket 32 damaging the heat sink 40.

In one embodiment, the number of the first through holes 43 on the heat sink 40 is multiple, and the multiple first through holes 43 are arranged at intervals along the second direction X, and the multiple first through holes 43 are arranged at intervals along the third direction Y. In one embodiment, the number and position of the first through holes 43 correspond to the number and position of the mutually abutting convex parts and concave parts, so that each mutually abutting convex part and concave part passes through the corresponding first through hole 43, reducing the risk of the interaction force between the first bracket 22 and the second bracket 32 damaging the heat sink 40.

In one embodiment, the battery pack 100 further includes a first heat conductive member 51, which is disposed between the first surface 41 and the first battery cell assembly 20. The first heat conductive member 51 can improve the heat exchange efficiency between the first battery cell assembly 20 and the heat dissipation member 40, thereby improving the heat dissipation of the battery pack 100. In one embodiment, the first heat conductive member 51 connects the first surface 41 and the first battery cell assembly 20 in a contact manner.

In one embodiment, the first heat conductive member 51 is coated on the first surface 41, which can improve the heat exchange efficiency between the first heat conductive member 51 and the heat sink 40. In one embodiment, the first heat conductive member 51 is in contact with the first housing 211, which can improve the heat exchange efficiency between the first heat conductive member 51 and the first battery core 21. In one embodiment, the first heat conductive member 51 is formed by filling the first surface 41 and the first battery core 21 with heat conductive glue and then curing it.

In one embodiment, the battery pack 100 further includes a second heat conductive member 52, which is disposed between the second surface 42 and the second battery cell assembly 30. The second heat conductive member 52 can improve the heat exchange efficiency between the second battery cell assembly 30 and the heat dissipation member 40, thereby improving the heat dissipation of the battery pack 100. In one embodiment, the second heat conductive member 52 connects the second surface 42 and the second battery cell assembly 30 in a contact manner.

In one embodiment, the second heat conductive member 52 is coated on the second surface 42, which can improve the heat exchange efficiency between the second heat conductive member and the heat sink 40. In one embodiment, the second heat conductive member 52 is in contact with the second housing 311, which can improve the heat exchange efficiency between the second heat conductive member 52 and the second battery cell 31. In one embodiment, the second heat conductive member 52 is formed by filling the heat conductive glue between the second surface 42 and the second battery cell 31 and then curing.

In one embodiment, the first bracket 22 is connected to the heat sink 40, the second bracket 32 is connected to the heat sink 40, and the first bracket 22 and the second bracket 32 are indirectly connected by connecting the heat sink 40. In one embodiment, the first surface 41 of the heat sink 40 is provided with a first groove (not shown), and the second surface 42 is provided with a second groove (not shown), the first groove is formed by the first surface 41 being recessed, and the second groove is formed by the second surface 42 being recessed, the first protrusion 222 on the first bracket 22 is inserted into the first groove, and the second protrusion 323 on the second bracket 32 is inserted into the second groove.

In one embodiment, the number of the heat sink 40 is multiple (not shown). Optionally, the multiple heat sinks 40 are arranged along the second direction X. Optionally, the multiple heat sinks 40 are arranged along the third direction Y.

In one embodiment, the number of the heat sink 40 is one. In one embodiment, the first surface 41 of the heat sink 40 includes three first areas 44, and the three first areas 44 are arranged in a spaced arrangement along the third direction Y, and the first heat conductor 51 is disposed in the first area 44. The plurality of first battery cells 21 stacked along the second direction X corresponds to one first area 44. In one embodiment, along the first direction Z, the projections of all the first shells 211 overlap with the projections of the first area 44.

In one embodiment, the first through hole 43 is disposed between two adjacent first regions 44 .

In one embodiment, the second surface 42 of the heat sink 40 includes three second areas 45, and the three second areas 45 are arranged at intervals along the third direction Y, and the second heat conductor 52 is disposed in the second area 45. A plurality of second battery cells 31 stacked along the second direction X corresponds to one second area 45. In one embodiment, along the first direction Z, the projections of all the second shells 311 overlap with the projections of the second areas 45.

In one embodiment, the first through hole 43 is disposed between two adjacent second regions 45 .

Please refer to Figures 4, 8, 9 and 13. In one embodiment, the first bracket 22 covers at least a portion of the two sides of the first main body 2111 along the first direction Z. When the first bracket 22 is connected to the second bracket 32, it is helpful to reduce the influence of the interaction force between the first bracket 22 and the second bracket 32 on the first top sealing portion 21122.

In one embodiment, the first bracket 22 covers at least a portion of the first side seal portion 21121, which helps to further reduce the effect of the interaction force between the first bracket 22 and the second bracket 32 on the first top seal portion 21122 and reduce the risk of deformation of the first top seal portion 21122.

In one embodiment, along the first direction Z, the projection of the first protrusion 222 overlaps with the projection of the first main body 2111 , which helps to reduce the influence of the interaction force between the first bracket 22 and the second bracket 32 on the first top sealing portion 21122 when the first bracket 22 is connected to the second bracket 32 .

In one embodiment, the second bracket 32 covers at least a portion of the second main body portion 3111 on both sides along the first direction Z. When the first bracket 22 is connected to the second bracket 32, it is helpful to reduce the influence of the interaction force between the first bracket 22 and the second bracket 32 on the second top sealing portion 31122.

In one embodiment, the second bracket 32 covers at least a portion of the second side seal portion 31121, which is beneficial to further reduce the effect of the interaction force between the first bracket 22 and the second bracket 32 on the second top seal portion 31122 and reduce the risk of deformation of the second top seal portion 31122.

In one embodiment, along the first direction Z, the projection of the second recess 322 overlaps with the projection of the second main body portion 3111 , which helps to reduce the influence of the interaction force between the first bracket 22 and the second bracket 32 on the second top sealing portion 31122 when the first bracket 22 is connected to the second bracket 32 .

Please refer to FIG. 1, FIG. 2, FIG. 7 and FIG. 8 in combination. In one embodiment, the first support 22 covers the first connection area 214 to form a first channel 228, and the first channel 228 runs through the first support 22. The first channel 228 can form a heat dissipation channel for cooling objects to pass through, thereby improving the heat dissipation of the first connection area 214 and the first battery cell assembly 20. Optionally, the first channel 228 runs through the first support 22 along the first direction Z.

In one embodiment, the first through hole 43 and the gap 91 are connected to the first channel 228, so that a heat dissipation channel along the first direction Z can be formed in the battery pack 100, thereby improving the heat dissipation of the first battery cell assembly 20 and the second battery cell assembly 21. The heat dissipation of the component 30 and the heat dissipation component 40.

In one embodiment, the first wall 11 is provided with a second through hole 111, which passes through the first wall 11; the second wall 12 is provided with a third through hole 121, which passes through the second wall 12; the first channel 228 communicates with the second through hole 111 and the third through hole 121; the first channel 228, the second through hole 111 and the third through hole 121 form a heat dissipation channel for a coolant to pass through; the coolant outside the battery pack 100 passes through the first channel 228, the second through hole 111 and the third through hole 121, and takes away part of the heat in the battery pack 100, thereby improving the heat dissipation of the battery pack 100. In one embodiment, the first channel 228, the gap 91, the first through hole 43, the second through hole 111 and the third through hole 121 are interconnected.

In one embodiment, the cooling substance includes but is not limited to any one of cold air, cooling liquid and coolant.

Please refer to FIG. 1, FIG. 2, FIG. 12 and FIG. 13 in combination. In one embodiment, the second support 32 covers the second connection area 314 to form a second channel 328, and the second channel 328 runs through the second support 32. The second channel 328 can form a heat dissipation channel for cooling fluid to flow, thereby improving the heat dissipation of the second connection area 314 and the second battery cell assembly 30. Optionally, the second channel 328 runs through the second support 32 along the first direction Z.

In one embodiment, the first through hole 43 and the gap 91 are connected to the second channel 328 , so that a heat dissipation channel along the first direction Z can be formed in the battery pack 100 , thereby improving the heat dissipation of the first battery cell assembly 20 , the second battery cell assembly 30 and the heat sink 40 .

In one embodiment, the first channel 228 and the second channel 328 are interconnected, which is beneficial to improve the heat dissipation of the first battery cell assembly 20, the second battery cell assembly 30 and the heat sink 40. In one embodiment, along the first direction Z, the projection of the first channel 228 and the projection of the second channel 328 overlap, which is beneficial to further improve the heat dissipation of the first battery cell assembly 20, the second battery cell assembly 30 and the heat sink 40.

In one embodiment, the second channel 328 connects the second through hole 111 and the third through hole 121, and the first channel 228, the second channel 328, the second through hole 111 and the third through hole 121 form a heat dissipation channel for the coolant to pass through. The coolant outside the battery pack 100 passes through the first channel 228, the second channel 328, the second through hole 111 and the third through hole 121, and takes away part of the heat inside the battery pack 100, thereby improving the heat dissipation of the battery pack 100.

Please refer to Figures 8, 16 and 18. In one embodiment, along the second direction X, the first brackets 22 on two adjacent first battery cell assemblies 20 are connected to each other, which is beneficial to improve the stability of the connection between the adjacent first battery cell assemblies 20, reduce the number of supports between the adjacent first battery cell assemblies 20, and reduce the cost of the battery pack 100.

In one embodiment, the first bracket 22 includes a first stopper 226 and a second stopper 227, the first stopper 226 and the second stopper 227 are respectively located on both sides of the first bracket 22 along the second direction X, and the first stopper 226 and the second stopper 227 are respectively extended outwardly away from each other along the second direction X. In one embodiment, along the second direction X, the first brackets 22 of two adjacent first battery core assemblies 20 are abutted by the first stopper 226 and/or the second stopper 227, which is conducive to improving the stability of the connection between the two adjacent first battery core assemblies 20 and further improving the anti-seismic performance.

In one embodiment, the length of the first stopper 226 along the second direction X is greater than the length of the second stopper 227. The lengths along the second direction X are equal. Along the second direction X, among two adjacent first battery cell assemblies 20, the first stop portion 226 of one first battery cell assembly 20 abuts against the first bracket 22 of the other first battery cell assembly 20, and the second stop portion 227 of one first battery cell assembly 20 abuts against the first bracket 22 of the other first battery cell assembly 20.

As shown in FIG. 19 , in one embodiment, the length of the first stopper 226 and the length of the second stopper 227 along the second direction X are not equal. In one embodiment, the length of the first stopper 226 along the second direction X is greater than the length of the second stopper 227 along the second direction X, and of two first battery cell assemblies 20 adjacent to each other along the second direction X, the first stopper 226 of one first battery cell assembly 20 abuts against the first bracket 22 of the other first battery cell assembly 20.

As shown in Figure 20, in one embodiment, the length of the first stop portion 226 along the second direction X is smaller than the length of the second stop portion 227 along the second direction X, and among two adjacent first battery cell assemblies 20 along the second direction X, the second stop portion 227 of one of the first battery cell assemblies 20 abuts against the first bracket 22 of the other first battery cell assembly 20.

As shown in FIG. 21 , in one embodiment, of two first battery cell assemblies 20 adjacent to each other along the second direction X, the first stopping portion 226 of one first battery cell assembly 20 abuts against the second stopping portion 227 of the other first battery cell assembly 20 .

As an example, the following further describes the case where the first stopper 226 of a first battery cell assembly 20 abuts against the second stopper 227 of another first battery cell assembly 20 (as shown in FIG. 21 ).

In one embodiment, the first stopper 226 is provided with a first opening 2261, and along the third direction Y, the projection of the first opening 2261 is at least partially separated from the projection of the second stopper 227. In one embodiment, when viewed along the third direction Y, at least a portion of the first opening 2261 is exposed to the second stopper 227. The first opening 2261 forms a heat dissipation channel for a coolant to pass through, which is conducive to the coolant taking away at least part of the heat on the first bracket 22, thereby improving the heat dissipation of the first bracket 22 and the heat dissipation of the first battery cell assembly 20.

In one embodiment, there are multiple first openings 2261 , and the multiple first openings 2261 are arranged along the first direction Z, which is beneficial to further improve the heat dissipation of the first bracket 22 .

In one embodiment, the first opening 2261 is disposed at the end of the first stopper 226 along the second direction X, and is a groove structure with an opening. In one embodiment, the first opening 2261 is a through hole.

In one embodiment, the second stopper 227 is provided with a second opening 2271, and along the third direction Y, the projection of the second opening 2271 is at least partially separated from the projection of the first stopper 226. In one embodiment, when viewed along the third direction Y, at least a portion of the second opening 2271 is exposed to the first stopper 226. The second opening 2271 forms a heat dissipation channel for a coolant to pass through, which is conducive to the coolant taking away at least part of the heat on the first bracket 22, thereby improving the heat dissipation of the first bracket 22 and the heat dissipation of the first battery cell assembly 20.

In one embodiment, there are multiple second openings 2271 , and the multiple second openings 2271 are arranged along the first direction Z, which is beneficial to further improve the heat dissipation of the first bracket 22 .

In one embodiment, the second opening 2271 is disposed at the end of the second stopper 227 along the second direction X, and is a groove structure with an opening. In one embodiment, the second opening 2271 is a through hole.

In one embodiment, the first opening 2261 is separated from the second opening 2271. The first opening 2261 and the second opening 2271 are communicated with each other.

Please continue to refer to FIG. 18 . As an example, the following further describes the example in which the length of the first stop portion 226 along the second direction X is equal to the length of the second stop portion 227 along the second direction X.

In one embodiment, the first stop portion 226 and the second stop portion 227 are interconnected along the third direction Y, which is beneficial for limiting the two first battery cell assemblies 20 adjacent to each other along the second direction X along the third direction Y, further reducing the number of supports or fillers and reducing the cost of the battery pack 100.

In one embodiment, the number of the first stoppers 226 is two, and the two first stoppers 226 are spaced apart along the third direction Y. The number of the second stoppers 227 is two, and the two second stoppers 227 are spaced apart along the third direction Y. In one embodiment, the distance between the inner sides of the two first stoppers 226 corresponds to the distance between the outer sides of the two second stoppers 227. When the first stoppers 226 and the second stoppers 227 on different first brackets 22 abut against each other, along the third direction Y, the outer sides of the two second stoppers 227 abut against the inner sides of the two first stoppers 226, respectively, so that the two first battery cell assemblies 20 are mutually limited along the third direction Y, and the number of supports can be reduced.

In one embodiment, among two first battery cell assemblies 20 adjacent along the second direction X, when observed along the third direction Y, there is a gap between the first brackets 22 of the two first battery cell assemblies 20, and there is a gap between the first shells 211 of the two first battery cell assemblies 20, which can form a heat dissipation channel for gas circulation, thereby improving the heat dissipation of the first bracket 22 and the first battery cell 21.

Please refer to Figures 13, 16 and 22. In one embodiment, along the second direction X, the second brackets 32 on two adjacent second battery cell assemblies 30 abut against each other, which is beneficial to improve the stability of the connection between the adjacent second battery cell assemblies 30, reduce the number of supports between the adjacent second battery cell assemblies 30, and reduce the cost of the battery pack 100.

In one embodiment, the second bracket 32 includes a third stopper 326 and a fourth stopper 327, the third stopper 326 and the fourth stopper 327 are respectively located on both sides of the second bracket 32 along the second direction X, and the third stopper 326 and the fourth stopper 327 are respectively extended outwardly away from each other along the second direction X. In one embodiment, along the second direction X, the second brackets 32 of two adjacent second battery cell assemblies 30 are abutted by the third stopper 326 and/or the fourth stopper 327, which is conducive to improving the stability of the connection between the two adjacent second battery cell assemblies 30 and further improving the anti-seismic performance.

In one embodiment, the length of the third stop portion 326 along the second direction X is equal to the length of the fourth stop portion 327 along the second direction X. Along the second direction X, among two adjacent second battery cell assemblies 30, the third stop portion 326 of one second battery cell assembly 30 abuts against the second bracket 32 of the other second battery cell assembly 30, and the fourth stop portion 327 of one second battery cell assembly 30 abuts against the second bracket 32 of the other second battery cell assembly 30.

As shown in FIG. 23 , in one embodiment, the length of the third stopper 326 along the second direction X is not equal to the length of the fourth stopper 327 along the second direction X. In one embodiment, the length of the third stopper 326 along the second direction X is greater than the length of the fourth stopper 327 along the second direction X, and of two second battery cell assemblies 30 adjacent to each other along the second direction X, the third stopper 326 of one second battery cell assembly 30 abuts against the first bracket 22 of the other second battery cell assembly 30.

As shown in FIG. 24 , in one embodiment, the length of the third stopper 326 along the second direction X is less than Due to the length of the fourth stopping portion 327 along the second direction X, the fourth stopping portion 327 of one of the two second cell assemblies 30 adjacent to each other along the second direction X abuts against the first bracket 22 of the other second cell assembly 30 .

As shown in FIG. 25 , in one embodiment, among two second battery cell assemblies 30 adjacent to each other along the second direction X, the third stopping portion 326 of one second battery cell assembly 30 abuts against the fourth stopping portion 327 of the other second battery cell assembly 30 .

As an example, the following further describes the case where the third stopper 326 of one second battery cell assembly 30 abuts against the fourth stopper 327 of another second battery cell assembly 30 (as shown in FIG. 25 ).

In one embodiment, the third stopper 326 is provided with a third opening 3261, and along the third direction Y, the projection of the third opening 3261 is at least partially separated from the projection of the fourth stopper 327. In one embodiment, when viewed along the third direction Y, at least a portion of the third opening 3261 is exposed to the fourth stopper 327. The third opening 3261 forms a heat dissipation channel for a coolant to pass through, which is conducive to the coolant taking away at least part of the heat on the second bracket 32, improving the heat dissipation of the second bracket 32, and improving the heat dissipation of the second battery cell assembly 30.

In one embodiment, there are multiple third openings 3261 , and the multiple third openings 3261 are arranged along the first direction Z, which is beneficial to further improve the heat dissipation of the second bracket 32 .

In one embodiment, the third opening 3261 is disposed at the end of the third stopper 326 along the second direction X, and is a groove structure with an opening. In one embodiment, the third opening 3261 is a through hole.

In one embodiment, the fourth stopper 327 is provided with a fourth opening 3271, and along the third direction Y, the projection of the fourth opening 3271 is at least partially separated from the projection of the third stopper 326. In one embodiment, when viewed along the third direction Y, at least a portion of the fourth opening 3271 is exposed to the third stopper 326. The fourth opening 3271 forms a heat dissipation channel for a coolant to pass through, which is conducive to the coolant taking away at least part of the heat on the second bracket 32, thereby improving the heat dissipation of the second bracket 32 and the heat dissipation of the second battery cell assembly 30.

In one embodiment, there are multiple fourth openings 3271 , and the multiple fourth openings 3271 are arranged along the first direction Z, which is beneficial to further improve the heat dissipation of the second bracket 32 .

In one embodiment, the fourth opening 3271 is disposed at the end of the fourth stopper 327 along the second direction X, and is a groove structure with an opening. In one embodiment, the fourth opening 3271 is a through hole.

In one embodiment, the third opening 3261 is separated from the fourth opening 3271. In one embodiment, the third opening 3261 is connected to the fourth opening 3271.

Please refer to FIG. 22 . As an example, the following further describes the example that the length of the third stop portion 326 along the second direction X is equal to the length of the fourth stop portion 327 along the second direction X.

In one embodiment, the third stopper 326 and the fourth stopper 327 abut against each other along the third direction Y, which is conducive to connecting two second battery cell assemblies 30 adjacent to each other along the second direction X along the third direction Y to limit the position, further reducing the number of supports or fillers, and reducing the cost of the battery pack 100. In one embodiment, the number of the third stopper 326 is two, and the two third stoppers 326 are spaced apart along the third direction Y. The number of the fourth stopper 327 is two, and the two fourth stoppers 327 are spaced apart along the third direction Y. In one embodiment, the distance between the inner sides of the two third stoppers 326 corresponds to the distance between the outer sides of the two fourth stoppers 327. When the third stoppers 326 on different second brackets 32 When the blocking portion 326 and the fourth stop portion 327 are in contact, along the third direction Y, the outer sides of the two fourth stop portions 327 are respectively in contact with the inner sides of the two third stop portions 326, so that the two second battery cell assemblies 30 are mutually limited along the third direction Y, which can reduce the number of supports.

In one embodiment, among two second battery cell assemblies 30 adjacent along the second direction X, when observed along the third direction Y, there is a gap between the second brackets 32 of the two second battery cell assemblies 30, and there is a gap between the second shells 311 of the two second battery cell assemblies 30, which can form a heat dissipation channel for gas circulation, thereby improving the heat dissipation of the second brackets 32 and the second battery cells 31.

As shown in FIGS. 2 and 3 , in one embodiment, the battery pack 100 further includes a connection assembly 70, which is disposed on one side of the plurality of first battery cell assemblies 20, the plurality of second battery cell assemblies 30, and the heat sink 40 along the third direction Y. The connection assembly 70 connects the plurality of first battery cell assemblies 20 and the plurality of second battery cell assemblies 30, so that the plurality of first battery cell assemblies 20 and the plurality of second battery cell assemblies 30 are connected. Optionally, the plurality of first battery cell assemblies 20 and the plurality of second battery cell assemblies 30 are connected in series.

In one embodiment, a plurality of first battery cell assemblies 20 and a plurality of second battery cell assemblies 30 are connected to form a total positive terminal and a total negative terminal (not shown), and the total positive terminal and the total negative terminal are connected to a circuit board.

In one embodiment, the battery pack 100 further includes a first connection terminal 81 and a second connection terminal 82 , wherein the first connection terminal 81 is connected to the main positive terminal and the circuit board, and the second connection terminal 82 is connected to the main negative terminal and the circuit board.

In summary, the battery pack 100 of the present application is connected by the first bracket 22 and the second bracket 32, and a gap 91 is formed between the first battery cell assembly 20 and the second battery cell assembly 30. The heat sink 40 is arranged in the gap 91, which helps to reduce the risk of damage to the heat sink 40 due to squeezing of the battery cell assembly.

As shown in FIG. 26 , an embodiment of the present application further provides an electric device 200 , comprising the battery pack 100 described in any of the above embodiments, and the battery pack 100 can provide electrical energy to the electric device 200 .

In one embodiment, the electric device 200 includes but is not limited to any one of a drone, an electric two-wheeled vehicle, and an electric tool.

In the electrical device 200 of the present application, it is helpful to reduce the damage of the heat sink 40 between the first battery cell assembly 20 and the second battery cell assembly 30 due to extrusion, thereby increasing the service life of the battery pack 100 and reducing the impact of the service life of the battery pack 100 on the electrical device 200.

In addition, those skilled in the art may also make other changes within the spirit of the present application. Of course, these changes made according to the spirit of the present application should be included in the scope disclosed in the present application.

Claims

A battery pack, characterized by comprising:

shell;

A first battery cell assembly is disposed in the housing, wherein the first battery cell assembly comprises a first battery cell and a first bracket, wherein the first bracket is bonded to a surface of the first battery cell;

A second battery cell assembly is disposed in the housing, the second battery cell assembly comprises a second battery cell and a second bracket, the second bracket is bonded to a surface of the second battery cell, and the first battery cell assembly and the second battery cell assembly are stacked along a first direction;

The first bracket is connected to the second bracket, and a gap is formed between the first battery cell assembly and the second battery cell assembly;

The heat dissipation element is arranged in the gap.
The battery pack according to claim 1, wherein the first bracket and the second bracket are connected by abutment.
The battery pack as described in claim 1 is characterized in that one of the first bracket and the second bracket is provided with a convex portion, and the other is provided with a concave portion, and the convex portion is provided in the concave portion; the heat dissipation element is provided with a first through hole, and at least part of the convex portion and/or at least part of the concave portion is accommodated in the first through hole.
The battery pack according to claim 3, characterized in that

At least a portion of the convex portion is disposed in the concave portion to form the gap between the first battery cell assembly and the second battery cell assembly;

Along the first direction, the length of the heat sink is less than or equal to the length of the gap.
The battery pack according to claim 1, wherein:

The first bracket covers at least a portion of both sides of the first battery core along the first direction;

The second bracket covers at least a portion of two sides of the second battery core along the first direction.
The battery pack according to claim 1, wherein:

The first battery cell includes a first shell, a first electrode assembly and a first electrode terminal, the first electrode assembly is arranged inside the first shell, the first electrode terminal is connected to the first electrode assembly and extends out of the first shell, the first shell includes a first main body and a first edge sealing portion, the first edge sealing portion is connected to the first main body, the first electrode assembly is arranged inside the first main body, the first electrode terminal extends from the first edge sealing portion, and the first bracket covers at least a portion of the first edge sealing portion.
The battery pack according to claim 6, wherein the first bracket covers at least a portion of the first main body.
The battery pack as described in claim 7 is characterized in that the first edge sealing portion includes a first side sealing portion and a first top sealing portion connected to each other, the first electrode terminal extends from the first top sealing portion, and the first bracket covers at least a portion of the first side sealing portion and the first top sealing portion.
The battery pack according to claim 6, characterized in that

One of the first bracket and the second bracket is provided with a convex portion, and the other is provided with a concave portion. The convex portion is disposed on the concave portion;

Along the first direction, a projection of the convex portion overlaps with a projection of the first main body portion.
The battery pack according to claim 1, wherein:

The first bracket further includes a first stopper and a second stopper, the first stopper and the second stopper are respectively located on both sides of the first bracket along a second direction, the second direction is perpendicular to the first direction, and the first stopper and the second stopper are respectively extended outwardly away from each other along the second direction;

Along the second direction, two adjacent first brackets are in abutment with each other through the first stopper and/or the second stopper;

The second bracket further includes a third stopper and a fourth stopper, the third stopper and the fourth stopper are respectively located at two sides of the second bracket along the second direction, and the third stopper and the fourth stopper are respectively extended outwardly away from each other along the second direction;

Along the second direction, two adjacent second brackets are in abutment with each other through the third stopper and/or the fourth stopper.
The battery pack according to claim 10, characterized in that

The first stop portion is provided with a first opening, and when viewed along a third direction perpendicular to the first direction and the second direction, at least a portion of the first opening is exposed to the second stop portion;

and / or,

The second stop portion is provided with a second opening, and when viewed along the third direction, at least a portion of the second opening is exposed to the first stop portion.
The battery pack according to claim 1, wherein:

The first battery cell comprises a first shell, a first electrode terminal and a third electrode terminal, wherein the first electrode terminal and the third electrode terminal extend from opposite sides of the first shell respectively.

The first battery cell assembly includes a plurality of the first battery cells, the plurality of the first battery cells are arranged along a third direction, and among two adjacent first battery cells along the third direction, a first electrode terminal of one of the first battery cells is connected to a third electrode terminal of the other first battery cell to form a first connection area, and the first bracket covers at least a portion of the first connection area and at least a portion of the first shells of the two adjacent first battery cells, and the third direction is perpendicular to the first direction;

The second battery cell comprises a second shell, a second electrode terminal and a fourth electrode terminal, wherein the second electrode terminal and the fourth electrode terminal extend from opposite sides of the second shell respectively.

The second battery cell assembly includes a plurality of second battery cells, the plurality of second battery cells are arranged along the third direction, and in two adjacent second battery cells along the third direction, the second electrode terminal of one second battery cell is connected to the fourth electrode terminal of the other second battery cell to form a second connection area, and the second bracket covers at least part of the second connection area and at least part of the second shells of the two adjacent second battery cells;

The first bracket covers the first connection area to form a portion that penetrates along the first direction. The first channel, and/or the portion of the second bracket covering the second connecting area forms a second channel penetrating along the first direction.
The battery pack according to claim 12, characterized in that:

The housing is provided with a second through hole and a third through hole;

The first channel is connected to the second through hole and the third through hole, and/or the second channel is connected to the second through hole and the third through hole.
The battery pack according to any one of claims 1 to 13, characterized in that the first bracket is formed on at least a portion of the surface of the first battery cell by a perfusion process, and/or the second bracket is formed on at least a portion of the surface of the second battery cell by a perfusion process.
An electrical device, characterized in that it comprises a battery pack as described in any one of claims 1 to 14.