CN219759742U - Battery pack and electric equipment - Google Patents

Abstract

The utility model discloses a battery pack and electric equipment. The box body comprises an upper cover and a bottom shell which are connected. The battery pack is arranged in the box body. The battery pack comprises a plurality of single battery cells arranged side by side. And a first heat conduction component is arranged between two adjacent single battery cells in the arrangement direction of the plurality of single battery cells, and is in heat conduction connection with the two single battery cells and the upper cover. The plurality of bus bars are electrically connected with the plurality of single battery cells. In the charge-discharge process, heat between two adjacent single battery cells can be conducted to the upper cover through the first heat conduction component, and finally the heat is dissipated through the upper cover, so that the problem of large temperature difference of the single battery cells is solved, the safety of the battery pack is improved, and the service life of the battery pack is prolonged.

Description

Battery pack and electric equipment

Technical Field

The embodiment of the utility model relates to the technical field of energy storage devices, in particular to a battery pack.

Background

The battery pack comprises a plurality of single battery cells, the single battery cells can generate heat in the charging and discharging process, and if the heat is not timely dissipated, the safety and the service life of the battery pack can be affected.

The battery pack in the related art is generally provided with a cooling assembly. However, the cooling assembly of the related art has a problem in that the cooling effect is not good and the temperature difference between different regions within the battery pack is large.

Disclosure of Invention

The embodiment of the utility model provides a battery pack and electric equipment, which are used for solving the problem that the temperature difference of different areas in the battery pack is large in the related technology.

The battery pack comprises a box body, a battery pack and a plurality of converging pieces, wherein the box body comprises an upper cover and a bottom shell which are connected; the battery pack is arranged in the box body; the battery pack comprises a plurality of single battery cells which are arranged side by side; a first heat conduction component is arranged between two adjacent single battery cells in the arrangement direction of the plurality of single battery cells, and is in heat conduction connection with the two single battery cells and the upper cover; the plurality of bus pieces are electrically connected with the plurality of single battery cells.

In one embodiment of the utility model, each of the bus bars is thermally connected to the upper cover.

In one embodiment of the present utility model, each of the bus bars is in direct contact with a side surface of the upper cover facing the battery pack; or alternatively, the first and second heat exchangers may be,

a first heat conduction layer made of a heat conduction material is arranged between each of the confluence pieces and one side surface of the upper cover, which faces the battery pack.

In one embodiment of the present utility model, the first heat conduction assembly includes:

the heat absorption sheet is clamped between two adjacent single battery cells in the arrangement direction, one side surface of the heat absorption sheet is attached to one single battery cell, and the other side surface of the heat absorption sheet is attached to the other single battery cell; and

and one end of the heat conducting piece is connected with the heat absorbing sheet, and the other end of the heat conducting piece is in heat conducting connection with the upper cover.

In an embodiment of the utility model, a portion of the heat conducting member exposed out of the top surface of the battery pack includes a connection portion for heat conducting connection with the upper cover;

the bus piece comprises an arch part and two electrode connecting parts, the arch part is used for being in heat conduction connection with the upper cover, the two electrode connecting parts are respectively connected to two opposite ends of the arch part, and the two electrode connecting parts are respectively and electrically connected with electrodes of two adjacent single battery cells;

the side of the connecting part, which is away from the battery pack, is provided with a first heat conducting surface, the side of the arched part, which is away from the battery pack, is provided with a second heat conducting surface, and the first heat conducting surface and the second heat conducting surface are flush.

In an embodiment of the utility model, the single battery cell includes a battery cell body and an electrode, wherein the electrode is convexly arranged on one side surface of the battery cell body in the height direction;

the two adjacent battery cell bodies are respectively provided with large faces facing each other, the large faces are rectangular in shape, and orthographic projections of the heat absorbing sheets on the large faces along the arrangement direction are rectangular in shape;

the heat absorbing sheet is attached between the two large faces, and the orthographic projection area is larger than half of the large face area.

In one embodiment of the present utility model, the heat absorbing sheet has opposite first and second sides in a second direction, and the cell body has opposite first and second sides in the second direction; wherein the second direction is perpendicular to the arrangement direction;

the first side is aligned with the first side and the second side is aligned with the second side.

In one embodiment of the present utility model, the area of the large surface not covered by the heat absorbing sheet includes an exposed surface, and the exposed surface is connected with the surface of the cell body where the electrode is provided;

a portion of the heat conductive member is fitted between the two exposed surfaces facing each other.

In an embodiment of the present utility model, the upper cover is formed with a flow passage for accommodating a flow of a fluid, and the upper cover is configured to adjust a temperature of the battery pack by the flow of the fluid in the flow passage; the flow channel comprises a plurality of sub flow channels, a first converging flow channel and a second converging flow channel;

a plurality of the sub-flow passages extend in the arrangement direction;

the first converging flow passage and the second converging flow passage extend along a second direction, and the first converging flow passage and the second converging flow passage are respectively arranged at two ends of the plurality of sub-flow passages along the arrangement direction so as to communicate the plurality of sub-flow passages; wherein the arrangement direction is perpendicular to the second direction.

In one embodiment of the present utility model, the upper cover has an inner surface facing the battery pack, an outer surface disposed opposite to the inner surface, and side surfaces connected to the inner surface and the outer surface, respectively;

an insulating layer is provided on both the outer surface and the side surface.

In an embodiment of the utility model, the arrangement direction is defined as a first direction; the battery pack includes a plurality of the battery packs arranged side by side in a second direction; a second heat conduction component is arranged between two adjacent single battery cells in the second direction, the second heat conduction component is in heat conduction connection with the two single battery cells, and the second heat conduction component is in heat conduction connection with an upper cover; wherein the second direction is perpendicular to the first direction.

The electric equipment comprises the battery pack, wherein the battery pack is used for providing electric energy for the electric equipment.

One embodiment of the above application has at least the following advantages or benefits:

according to the battery pack disclosed by the embodiment of the utility model, the first heat conduction component is arranged between two adjacent single battery cells, the first heat conduction component is in heat conduction connection with the two single battery cells, and the first heat conduction component is in heat conduction connection with the upper cover. Therefore, in the charge and discharge process, heat between two adjacent single battery cells can be conducted to the upper cover through the first heat conduction component, and finally the heat is emitted through the upper cover, so that the problem of large temperature difference of the single battery cells is solved, the safety of the battery pack is improved, and the service life of the battery pack is prolonged.

Drawings

Fig. 1 shows a schematic structure of an energy storage container according to a first embodiment of the present utility model.

Fig. 2 is an exploded view of a battery pack according to a first embodiment of the present utility model.

Fig. 3 shows a schematic structure of the case and the confluence member omitted in fig. 1.

Fig. 4 shows a schematic structure of the omitted bottom chassis of fig. 1.

Fig. 5 shows an exploded view of fig. 4.

Fig. 6 shows a partial enlarged view at X in fig. 5.

Fig. 7 is a schematic structural diagram of the first heat conduction assembly attached to the single cell.

Fig. 8 shows a cross-sectional view of the upper cover cut perpendicular to the height direction.

Fig. 9 is a schematic structural view of a battery pack according to a second embodiment of the present utility model, in which a case and a bus bar are omitted.

Fig. 10 is a schematic diagram showing the simulation of the top and bottom temperatures of a battery pack in the prior art during charge and discharge.

Fig. 11 is a schematic diagram showing a simulation of the top and bottom temperatures of a battery pack according to an embodiment of the present utility model during charge and discharge.

Wherein reference numerals are as follows:

100. energy storage container

10. Battery pack

200. Box body

220. Upper cover

221. Inner surface

222. Outer surface

223. Side surfaces

224. Flow passage

2241. Sub-runner

2242. First confluence flow passage

2243. Second confluence flow passage

226. Inlet port

227. An outlet

240. Bottom shell

400. Battery pack

400a, cell pairs

420. Single cell

422. Battery core body

424. Electrode

425. Top surface

426. Large surface

4261. Exposed surface

427. First side surface

428. Second side surface

429. Bottom surface

500. First heat conduction assembly

510. Heat absorbing sheet

511. First side edge

512. Second side edge

513. Third side edge

514. Fourth side edge

520. Heat conducting piece

521. Connecting part

522. A first heat conducting surface

600. Converging piece

600a, crossover collector

600b, lead out confluence piece

610. Arched portion

611. Second heat conducting surface

620. Electrode connection part

800. Second heat conduction assembly

D1, first direction

D2, second direction

D3, height direction

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus detailed descriptions thereof will be omitted.

One embodiment of the present utility model provides an electrical device, which may be, but is not limited to, a mobile phone, a portable device, a notebook computer, a battery car, an electric toy, an electric tool, an electric vehicle, a ship, a spacecraft, etc., for example, a spacecraft including an airplane, a rocket, a space shuttle, a spacecraft, etc.

It will be appreciated that the technical solution described in the embodiments of the present utility model is not limited to the above-described device, but may be applied to all devices using battery packs, such as energy storage containers, but for convenience of description, the following embodiments take electric devices as examples of energy storage containers.

For example, as shown in fig. 1, for a schematic view of an energy storage container 100 according to an embodiment of the present utility model, a plurality of battery packs 10 arranged in an array may be disposed inside the energy storage container 100, and the plurality of battery packs 10 may be connected in series or parallel.

As shown in fig. 2, the battery pack 10 includes a case 200, a battery pack 400, a plurality of bus bars 600, and a first heat conductive assembly 500.

It will be understood that the terms "comprising," "including," and "having," and any variations thereof, are intended to cover non-exclusive inclusions in the embodiments of the utility model. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may alternatively include other steps or elements not listed or inherent to such process, method, article, or apparatus.

The case 200 may include an upper cover 220 and a bottom case 240, and the upper cover 220 and the bottom case 240 are coupled together and form a chamber for accommodating the battery pack 400. The shape of the upper cover 220 and the bottom case 240 coupled together may be determined according to the shape of the battery pack 400. For example, in the embodiment of the present utility model, the upper cover 220 and the bottom cover 240 are connected to form a hollow cuboid, but not limited thereto.

As an example, the bottom case 240 has a rectangular parallelepiped shape with an opening, the upper cover 220 has a plate shape, and the upper cover 220 is fastened to the opening of the bottom case 240 to form a closed chamber for accommodating the battery pack 400.

Of course, in other embodiments, the bottom case 240 may have a plate shape, and the upper cover 220 has a rectangular parallelepiped shape with an opening. Alternatively, the bottom case 240 and the upper cover 220 are both rectangular and have openings on one surface, the openings of the bottom case 240 are opposite to the openings of the upper cover 220, and the bottom case 240 and the upper cover 220 form a closed chamber for accommodating the battery pack 400 after being fastened.

As shown in fig. 2, the number of the battery packs 400 may be one or more, and each battery pack 400 includes a plurality of unit cells 420 arranged side by side in the first direction D1. When the battery pack 10 includes a plurality of battery packs 400, the plurality of battery packs 400 are arranged side by side along the second direction D2. Wherein the first direction D1 is perpendicular to the second direction D2. The arrangement direction of the plurality of unit cells 420 in each battery pack 400 is the first direction D1. The arrangement direction of the plurality of battery packs 400 is the second direction D2.

The plurality of battery packs 400 refers to two or more battery packs 400.

It is understood that the plurality of unit cells 420 may be connected in series or parallel or a series-parallel connection, wherein the series-parallel connection refers to a mixture of series connection and parallel connection.

In the embodiment of the present utility model, the two sets of battery packs 400 are connected in series, and the plurality of unit cells 420 of each set of battery pack 400 are also connected in series, but not limited thereto.

The shape of the cell 420 may have various embodiments, for example, the cell 420 may be a square cell, a cylindrical cell, or the like. For convenience of explanation, the battery pack 10 will be explained in detail below using the square cell 420 as an example. When the single cell 420 is a square single cell, the first direction D1 is the thickness direction of the single cell 420, and the second direction D2 is the length direction of the single cell 420.

As shown in fig. 2, among the plurality of unit cells 420 of the battery pack 400, two adjacent unit cells 420 in the first direction D1 are disposed opposite to each other with the largest surface area.

It should be noted that, the single cell 420 includes an electrode assembly and an electrolyte, and the electrode assembly includes a positive electrode sheet, a negative electrode sheet and a separator. The unit cell 420 operates primarily by virtue of metal ions moving between the positive and negative plates. The positive plate comprises a positive electrode current collector and a positive electrode active material layer, wherein the positive electrode active material layer is coated on the surface of the positive electrode current collector, the positive electrode current collector without the positive electrode active material layer protrudes out of the positive electrode current collector coated with the positive electrode active material layer, and the positive electrode current collector without the positive electrode active material layer is used as a positive electrode lug. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate or the like. The negative electrode sheet comprises a negative electrode current collector and a negative electrode active material layer, wherein the negative electrode active material layer is coated on the surface of the negative electrode current collector, the negative electrode current collector without the negative electrode active material layer protrudes out of the negative electrode current collector coated with the negative electrode active material layer, and the negative electrode current collector without the negative electrode active material layer is used as a negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. The isolating film may be PP, PE, etc. In addition, the electrode assembly may be a roll-to-roll structure or a lamination structure, and embodiments of the present utility model are not limited thereto.

As shown in fig. 2, the plurality of bus bars 600 are electrically connected to the electrodes 424 of the plurality of unit cells 420, so as to realize serial connection, parallel connection or series-parallel connection of the plurality of unit cells 420.

In the embodiment of the present utility model, one of the plurality of bus bars 600 serves as a crossover bus bar 600a, and the crossover bus bar 600a is used to connect two battery packs 400. Two of the plurality of bus bars 600 serve as lead-out bus bars 600b, and the two lead-out bus bars 600b serve as positive and negative electrode terminals of the two battery packs 400, respectively, for connection with a battery management system (not shown in the drawings) of the battery pack 10.

As shown in fig. 2 and 3, a first heat conductive member 500 is provided between two adjacent unit cells 420 in the first direction D1. The first heat conduction assemblies 500 are respectively and thermally connected with the two adjacent unit cells 420, and the first heat conduction assemblies 500 are thermally connected with the upper cover 220.

It is understood that the heat generated by the single cell 420 during the charge and discharge processes is mostly concentrated at the middle upper portion of the single cell 420. Since the plurality of unit cells 420 of the battery pack 400 are arranged side by side, heat between two adjacent unit cells 420 is difficult to be dissipated, which results in a large temperature difference between the middle upper region and the bottom region of the unit cells 420, and affects the safety and the life of the unit cells 420.

Based on this, in the battery pack 10 according to the embodiment of the present utility model, the first heat conduction assembly 500 is disposed between two adjacent unit cells 420, the first heat conduction assembly 500 is in heat conduction connection with the two unit cells 420, and the first heat conduction assembly 500 is in heat conduction connection with the upper cover 220. In this way, in the charge and discharge process, heat between two adjacent single cells 420 is conducted to the upper cover 220 through the first heat conducting component 500, and finally the heat is dissipated through the upper cover 220, so that the problem of large temperature difference between the single cells 420 is solved, the safety of the battery pack 10 is improved, and the service life is prolonged.

As shown in fig. 3, the plurality of unit cells 420 in one battery pack 400 are grouped in pairs into a plurality of cell pairs 400a, and one cell pair 400a includes two adjacent unit cells 420 in the first direction D1. One first heat conductive member 500 is disposed between two individual cells 420 of each cell pair 400a, and no first heat conductive member 500 is disposed between two adjacent cell pairs 400 a. In this manner, each unit cell 420 in one battery pack 400 can be thermally connected to the first thermal conductive assembly 500, so that heat is conveniently conducted to the upper cover 220. Meanwhile, since the first heat conduction assembly 500 is not arranged between the two cell pairs 400a, the cost is saved.

Of course, in other embodiments, the first heat conduction component 500 may be disposed between every two adjacent unit cells 420 in one battery pack 400. In this way, the heat conduction efficiency can be improved.

In detail, in fig. 3, one battery pack 400 includes 8 unit cells 420,8 unit cells 420 numbered sequentially from 1 to 8 in the first direction D1, and then the first heat conductive members 500 are disposed between 1 and 2, between 2 and 3, between 3 and 4, between 4 and 5, between 5 and 6, between 6 and 7, and between 7 and 8.

As shown in fig. 3, the first heat conducting assembly 500 includes a heat absorbing sheet 510 and a heat conducting member 520, the heat absorbing sheet 510 is sandwiched between two adjacent unit cells 420 in the first direction D1, one side surface of the heat absorbing sheet 510 is attached to one of the unit cells 420, and the other side surface of the heat absorbing sheet 510 is attached to the other unit cell 420. The heat absorbing sheet 510 can timely absorb heat of the two unit cells 420. One end of the heat conductive member 520 is connected to the heat absorbing sheet 510, and the other end is thermally connected to the upper cover 220. The heat of the unit cells 420 is absorbed by the heat absorbing sheet 510, and then is transferred to the other end of the heat conductive member 520 through the heat conductive member 520 by the heat transfer of the heat conductive member 520. Since the other end of the heat conductive member 520 is thermally connected to the upper cover 220, the heat of the unit cell 420 is conducted to the upper cover 220, and finally the heat of the unit cell 420 is dissipated through the upper cover 220.

As an example, the material of the heat absorbing sheet 510 may be graphene, metal, or the like. When metal, copper, aluminum, or the like may be used.

The number of the heat conductive members 520 may be one or more, and the plurality refers to two or more.

Preferably, the heat conductive member 520 may be a heat pipe. The heat pipe has the advantages of high thermal response speed and high heat dissipation efficiency, and can rapidly conduct the heat absorbed by the heat absorbing sheet 510 to the upper cover 220, thereby improving the heat dissipation efficiency.

As shown in fig. 4 and 5, each of the bus bars 600 is thermally connected to the upper cover 220. In this embodiment, by thermally connecting each of the current collecting members 600 with the upper cover 220, the heat generated by each of the current collecting members 600 can also be conducted to the upper cover 220, and finally the heat is dissipated through the upper cover 220.

The manner in which each busbar 600 is thermally connected to the upper cover 220 may be: each of the bus bars 600 is in direct contact with a side surface of the upper cover 220 facing the battery pack 400; a first heat conductive layer (not shown) made of a heat conductive material may be provided between each of the bus members 600 and a side surface of the upper cover 220 facing the battery pack 400.

When the bus bar 600 is in direct contact with a side surface of the upper cover 220 facing the battery pack 400, the upper cover 220 needs to be insulated. For example, the upper cover 220 has an inner surface 221 facing the battery pack 400, an outer surface 222 disposed opposite to the inner surface 221, and side surfaces 223 connected to the inner surface 221 and the outer surface 222, respectively. An insulating layer made of an insulating material is provided on both the outer surface 222 and the side surface 223.

The thermally conductive connection of the first thermally conductive assembly 500 to the upper cover 220 may have various embodiments. For example, the first heat conductive member 500 is directly connected with a side surface of the upper cover 220 facing the battery pack 400. Alternatively, a third heat conductive layer made of a heat conductive material is provided between the first heat conductive member 500 and a side surface of the upper cover 220 facing the battery pack 400.

Of course, in other embodiments, since each of the bus members 600 is thermally connected to the upper cover 220, the first thermal conduction assembly 500 may also be connected to the bus member 600, and the thermal conduction connection of the first thermal conduction assembly 500 to the upper cover 220 is achieved through the bus member 600.

When the first heat conductive member 500 is heat-conductive connected with the upper cover 220 through the current collecting member 600, the first heat conductive member 500 is directly connected with the current collecting member 600 or is connected through a second heat conductive layer made of a heat conductive material.

Optionally, the first heat conducting layer, the second heat conducting layer and the third heat conducting layer may be a heat conducting silica gel, but not limited thereto.

As shown in fig. 4 to 6, in the embodiment of the present utility model, the portion of the heat conductive member 520 exposed to the top surface 425 of the battery pack 400 includes a connection portion 521, and the connection portion 521 is used for heat conductive connection with the upper cover 220. The connecting portion 521 has a first heat conducting surface 522 on a side facing away from the unit cell 420, where the first heat conducting surface 522 contacts with a surface of the upper cover 220 facing toward the unit cell 420, or a third heat conducting layer is disposed between the first heat conducting surface 522 and a surface of the upper cover 220 facing toward the unit cell 420.

The bus bar 600 includes a camber portion 610 and two electrode connection portions 620, the camber portion 610 is used for thermally conductive connection with the upper cover 220, the two electrode connection portions 620 are respectively connected to two opposite ends of the camber portion 610, and the two electrode connection portions 620 are respectively electrically connected to the electrodes 424 of two adjacent unit cells 420. The side of the arch 610 facing away from the cell 420 has a second thermally conductive surface 611. The second heat conducting surface 611 may be in direct contact with a side surface of the upper cover 220 facing the battery pack 400, or a first heat conducting layer may be disposed between the second heat conducting surface 611 and a side surface of the upper cover 220 facing the battery pack 400.

As shown in fig. 4, the first thermally conductive surface 522 and the second thermally conductive surface 611 are flush. In the embodiment of the utility model, the side surface of the upper cover 220 facing the single cell 420 is simultaneously contacted with the first heat conducting surface 522 and the second heat conducting surface 611.

During the charge and discharge process of the unit cells 420, heat between two adjacent unit cells 420 in the first direction D1 may be transferred to the upper cover 220 through the first heat conductive member 500, and heat generated by each of the bus members 600 may also be transferred to the upper cover 220, so that the upper cover 220 finally dissipates heat of the battery pack 10.

As shown in fig. 7, the single cell 420 includes a cell body 422 and an electrode 424. The cell body 422 includes a top surface 425, a bottom surface 429, a first side surface 427, a second side surface 428 and two large surfaces 426, the top surface 425 and the bottom surface 429 are oppositely arranged in the height direction D3 of the single cell 420, the first side surface 427 and the second side surface 428 are oppositely arranged in the second direction D2, and the two large surfaces 426 are oppositely arranged in the first direction D1. Wherein the areas of top surface 425, bottom surface 429, first side surface 427, and second side surface 428 are each smaller than the area of large surface 426. The height direction D3 of the single cell 420 is perpendicular to the first direction D1 and the second direction D2.

The electrode 424 protrudes from the top surface 425 of the cell body 422 for electrically connecting with the bus bar 600.

Between two adjacent cell bodies 422 in the first direction D1, there are large faces 426 facing each other, and the large faces 426 are rectangular in shape. The heat absorbing sheet 510 is rectangular sheet-like in shape, and the orthographic projection of the heat absorbing sheet 510 on the large face 426 along the first direction D1 is rectangular in shape. The heat sink 510 fits between the two large faces 426, and the area of the orthographic projection of the heat sink 510 on the large faces 426 is greater than one-half the area of the large faces 426. Since the shape of the large surface 426 and the shape of the heat absorbing sheet 510 are both rectangular, and the orthographic projection area of the heat absorbing sheet 510 on the large surface 426 is larger than the area of the large surface 426 by one half, the heat absorbing sheet 510 can cover the middle area of the large surface 426 in the height direction D3, that is, the heat absorbing sheet 510 covers the middle area of the single cell 420 in the height direction D3. In this way, the heat absorbing sheet 510 can rapidly absorb heat generated in the middle region of the unit cell 420 in the height direction D3, and conduct the heat to the upper cover 220 through the heat conducting member 520.

As shown in fig. 7, the area of the large face 426 not covered by the heat absorbing sheet 510 includes an exposed surface 4261, and the exposed surface 4261 is connected to the top face 425 of the cell body 422 where the electrodes 424 are provided. A portion of the thermally conductive member 520 is fitted between the two exposed surfaces 4261 facing each other.

In the embodiment of the present utility model, the exposed surface 4261 is connected to the top surface 425, so that the exposed surface 4261 corresponds to an upper region of the cell body 422 in the height direction D3, and thus the heat generated in the upper region can be conducted to the upper cover 220 through the heat conducting member 520.

Therefore, in the charge and discharge process of the single cell 420, the heat generated in the middle region of the single cell 420 can be sequentially conducted to the upper cover 220 through the heat absorbing sheet 510 and the heat conducting member 520, and the heat generated in the upper region of the single cell 420 can be conducted to the upper cover 220 through the heat conducting member 520. Meanwhile, the bus bar 600 is thermally connected to the upper cover 220, and heat generated from the bus bar 600 can be also transferred to the upper cover 220. Finally, the heat generated from the battery pack 10 is dissipated by the upper cover 220.

With continued reference to fig. 7, the heat absorbing sheet 510 has a first side 511 and a second side 512 opposite to each other in the second direction D2. The first side 511 is aligned with the first side 427 and the second side 512 is aligned with the second side 428.

The heat sink 510 has opposite third 513 and fourth 514 sides in the height direction D3 of the individual cells 420, the third 513 side being parallel to the top 425 and the fourth 514 side being parallel to the bottom 429.

As an example, the heat absorbing sheet 510 may be rectangular in shape, but is not limited thereto.

Of course, in other embodiments, third side 513 may be aligned with top surface 425 and fourth side 514 may be aligned with bottom surface 429.

As shown in fig. 8, the upper cover 220 is formed with a flow passage 224 for accommodating a flow of a fluid, an inlet 226, and an outlet 227, and both the inlet 226 and the outlet 227 communicate with the flow passage 224. Fluid flows into the flow channel 224 from the inlet 226, passes through the flow channel 224, and then flows out of the outlet 227. The upper cover 220 is configured to regulate the temperature of the battery pack 400 by fluid flow within the flow channels 224.

It will be appreciated that the fluid flowing in the flow passage 224 may be a liquid or a gas.

The heat generated in the upper middle region of the unit cell 420 and the bus bar 600 is conducted to the upper cover 220, and the heat dissipation efficiency of the battery pack 10 is further improved in cooperation with the fluid flowing in the flow channel 224.

As shown in fig. 8, the flow passage 224 includes a plurality of sub-flow passages 2241, a first confluent flow passage 2242, and a second confluent flow passage 2243. The plurality of sub-flow passages 2241 extend along the first direction D1, the first and second confluent flow passages 2242 and 2243 each extend along the second direction D2, and the first and second confluent flow passages 2242 and 2243 are respectively provided at both ends of the plurality of sub-flow passages 2241 along the first direction D1 to communicate the plurality of sub-flow passages 2241.

In the embodiment of the utility model, the upper cover 220 is formed with two flow channels 224, the two flow channels 224 are arranged side by side along the second direction D2, and the two flow channels 224 are respectively disposed above the two sets of battery packs 400. Inlet 226 communicates with a first converging flow passage 2242 of one of flow passages 224 and outlet 227 communicates with a first converging flow passage 2242 of the other flow passage 224. The two second merging flow passages 2243 communicate so that the two flow passages 224 communicate with each other.

As shown in fig. 9, the battery pack 10 of the second embodiment has substantially the same structure in the basic structure as the battery pack 10 of the first embodiment. Therefore, in the following description of the battery pack 10 of the second embodiment, the structure already described in the first embodiment is not repeated. The same reference numerals are given to the same components as those of the battery pack 10 described in the first embodiment. Therefore, in the following description of the present embodiment, the differences from the battery pack 10 of the first embodiment will be mainly described.

In the present embodiment, the number of the battery packs 400 is two or more, and the two or more battery packs 400 are arranged side by side in the second direction D2. A second heat conducting component 800 is disposed between two adjacent single cells 420 in the second direction D2, the second heat conducting component 800 is in heat conducting connection with the two single cells 420, and the second heat conducting component 800 is in heat conducting connection with the upper cover 220.

The specific structure and arrangement of the second heat-conducting component 800 may refer to the first heat-conducting component 500, and will not be described herein.

Under the combined action of the first and second heat-conducting assemblies 500 and 800, the heat generated by the single cells 420 can be more quickly and thoroughly conducted to the upper cover 220, and finally dissipated from the upper cover 220.

It should be noted that, in still another embodiment of the present utility model, a heat conduction component (the first heat conduction component 500 or the second heat conduction component 800) is disposed between two adjacent battery packs 400, and no heat conduction component is disposed between two adjacent unit cells 420 in each battery pack 400.

That is, the heat conductive member (the first heat conductive member 500 or the second heat conductive member 800) of the present utility model may be disposed only between two unit cells 420 adjacent to each other in the first direction D1, may be disposed only between two unit cells 420 adjacent to each other in the second direction D2, and may be disposed between two unit cells 420 adjacent to each other in the first direction D1 and between two unit cells 420 adjacent to each other in the second direction D2 as shown in fig. 9.

Fig. 10 is a schematic diagram showing the simulation of the top and bottom temperatures of a battery pack in the prior art during charge and discharge. As can be seen, one battery pack 400 includes eight individual cells 420, numbered 1 through 8 from left to right. The temperature of the top of the No. 1 cell 420 was 37.22 ℃, the temperature of the bottom was 33.94 ℃, and the temperature difference between the top and bottom was 3.28 ℃. The temperature of the top of the No. 6 cell 420 was 38.1 ℃, the temperature of the bottom was 34.74 ℃, and the temperature difference between the top and bottom was 3.36 ℃. The temperature of the top of the number 8 cell 420 was 38.32 ℃, the temperature of the bottom was 34.96 ℃, and the temperature difference between the top and bottom was 3.36 ℃. Fig. 11 is a schematic diagram showing a simulation of the top and bottom temperatures of a battery pack according to an embodiment of the present utility model during charge and discharge. It can be seen that the temperature at the top of the No. 1 cell 420 is 24.99 ℃, the temperature at the bottom is 26.76 ℃, and the temperature difference between the top and the bottom is 1.77 ℃. The temperature of the top of the No. 4 cell 420 was 25.18 ℃, the temperature of the bottom was 27.38 ℃, and the temperature difference between the top and bottom was 2.2 ℃. The temperature of the top of the No. 8 cell 420 was 26.64 ℃, the temperature of the bottom was 27.72 ℃, and the temperature difference between the top and bottom was 1.08 ℃.

As can be seen from comparing fig. 10 and 11, in the charge and discharge process, the top temperature of the single cell 420 of the battery pack according to the embodiment of the utility model is lower than that of the single cell of the battery pack according to the prior art, and the bottom temperature of the single cell 420 of the battery pack according to the embodiment of the utility model is lower than that of the single cell of the battery pack according to the prior art. In addition, the temperature difference between the top and the bottom of the single battery cell 420 of the battery pack according to the embodiment of the utility model is smaller than the temperature difference between the top and the bottom of the single battery cell of the battery pack of the prior art.

It will be appreciated that the various embodiments/implementations provided by the utility model may be combined with one another without conflict and are not illustrated here.

In the examples of the application, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more, unless expressly defined otherwise. The terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the terms in the examples of application will be understood by those of ordinary skill in the art as the case may be.

In the description of the application embodiments, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience in describing the application embodiments and simplifying the description, and do not indicate or imply that the devices or units to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the application embodiments.

In the description of the present specification, the terms "one embodiment," "some embodiments," "particular embodiments," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an application embodiment. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above is only a preferred embodiment of the application embodiment, and is not intended to limit the application embodiment, and various modifications and changes may be made to the application embodiment by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the application should be included in the protection scope of the embodiments of the application.

Claims (12)

1. A battery pack, comprising:

the box body comprises an upper cover and a bottom shell which are connected;

the battery pack is arranged in the box body; the battery pack comprises a plurality of single battery cells which are arranged side by side; a first heat conduction component is arranged between two adjacent single battery cells in the arrangement direction of the plurality of single battery cells, and is in heat conduction connection with the two single battery cells and the upper cover; and

and the plurality of confluence pieces are electrically connected with the plurality of single battery cores.

2. The battery pack of claim 1, wherein each of the bus bars is thermally connected to the upper cover.

3. The battery pack according to claim 2, wherein each of the bus members is in direct contact with a side surface of the upper cover facing the battery pack; or alternatively, the first and second heat exchangers may be,

a first heat conduction layer made of a heat conduction material is arranged between each of the confluence pieces and one side surface of the upper cover, which faces the battery pack.

4. The battery pack of claim 1, wherein the first thermally conductive assembly comprises:

the heat absorption sheet is clamped between two adjacent single battery cells in the arrangement direction, one side surface of the heat absorption sheet is attached to one single battery cell, and the other side surface of the heat absorption sheet is attached to the other single battery cell; and

and one end of the heat conducting piece is connected with the heat absorbing sheet, and the other end of the heat conducting piece is in heat conducting connection with the upper cover.

5. The battery pack according to claim 4, wherein a portion of the heat conductive member exposed to the top surface of the battery pack includes a connection portion for heat conductive connection with the upper cover;

the bus piece comprises an arch part and two electrode connecting parts, the arch part is used for being in heat conduction connection with the upper cover, the two electrode connecting parts are respectively connected to two opposite ends of the arch part, and the two electrode connecting parts are respectively and electrically connected with electrodes of two adjacent single battery cells;

the side of the connecting part, which is away from the battery pack, is provided with a first heat conducting surface, the side of the arched part, which is away from the battery pack, is provided with a second heat conducting surface, and the first heat conducting surface and the second heat conducting surface are flush.

6. The battery pack according to claim 4, wherein the unit cell includes a cell body and an electrode protruding from a side surface of the cell body in a height direction thereof;

the two adjacent battery cell bodies are respectively provided with large faces facing each other, the large faces are rectangular in shape, and orthographic projections of the heat absorbing sheets on the large faces along the arrangement direction are rectangular in shape;

the heat absorbing sheet is attached between the two large faces, and the orthographic projection area is larger than half of the large face area.

7. The battery pack of claim 6, wherein the heat sink has opposing first and second sides in a second direction, the cell body having opposing first and second sides in the second direction; wherein the second direction is perpendicular to the arrangement direction;

the first side is aligned with the first side and the second side is aligned with the second side.

8. The battery pack of claim 6, wherein the area of the large face not covered by the heat absorbing sheet includes an exposed surface connected to the surface of the cell body on which the electrode is provided;

a portion of the heat conductive member is fitted between the two exposed surfaces facing each other.

9. The battery pack according to claim 1, wherein the upper cover is formed with a flow passage for accommodating a flow of a fluid, the upper cover being configured to flow within the flow passage by the fluid to regulate a temperature of the battery pack;

the flow channel comprises a plurality of sub flow channels, a first converging flow channel and a second converging flow channel;

a plurality of the sub-flow passages extend in the arrangement direction;

the first converging flow passage and the second converging flow passage extend along a second direction, and the first converging flow passage and the second converging flow passage are respectively arranged at two ends of the plurality of sub-flow passages along the arrangement direction so as to communicate the plurality of sub-flow passages; wherein the arrangement direction is perpendicular to the second direction.

10. The battery pack according to claim 1, wherein the upper cover has an inner surface facing the battery pack, an outer surface disposed opposite to the inner surface, and side surfaces connected to the inner surface and the outer surface, respectively;

an insulating layer is provided on both the outer surface and the side surface.

11. The battery pack according to claim 1, wherein the arrangement direction is defined as a first direction;

the battery pack includes a plurality of the battery packs arranged side by side in a second direction; a second heat conduction component is arranged between two adjacent single battery cells in the second direction, the second heat conduction component is in heat conduction connection with the two single battery cells, and the second heat conduction component is in heat conduction connection with an upper cover; wherein the second direction is perpendicular to the first direction.

12. A powered device comprising the battery pack of any of claims 1-11 for providing electrical energy to the powered device.