CN116802900A

CN116802900A - Battery pack and electric equipment

Info

Publication number: CN116802900A
Application number: CN202180092236.0A
Authority: CN
Inventors: 喻律师; 吴明杰
Original assignee: Dongguan Poweramp Technology Ltd
Current assignee: Dongguan Poweramp Technology Ltd
Priority date: 2021-01-29
Filing date: 2021-01-29
Publication date: 2023-09-22
Also published as: WO2022160264A1

Abstract

The embodiment of the invention relates to the technical field of batteries, and particularly discloses a battery pack and electric equipment. The battery pack housing is provided with a battery cavity. The battery cell assembly is accommodated in the battery cavity and comprises a plurality of battery cells stacked along a first direction. Each cell includes an electrode assembly, a cell housing for receiving the electrode assembly, the cell housing including a sealing portion and a receiving portion, and a tab electrically connected to the electrode assembly, the tab extending from the sealing portion to the cell housing. The support plate is fixed with the battery shell body and comprises protruding parts arranged between sealing parts of adjacent battery cells. The first resin layer is arranged between the battery cell shell and the protruding part and is used for fixing the protruding part and at least part of the accommodating part. Through the mode, the embodiment of the invention can reduce the relative displacement generated between the battery cell assembly and the battery pack shell when the battery pack falls or is impacted, thereby reducing the risk of damaging the battery cell assembly.

Description

Battery pack and electric equipment

Technical Field

The embodiment of the invention relates to the technical field of batteries, in particular to a battery pack and electric equipment.

Background

In the current market, the commonly used battery comprises a single battery core, the electric quantity of the single battery core is small, and in order to increase the electric quantity, a plurality of battery cores are generally wrapped to form a new battery pack, and the problem of small electric quantity of the battery can be solved by the new battery pack. The battery pack generally comprises a battery pack shell, a battery cell assembly and a support plate, wherein the battery cell assembly and the support plate are positioned in the battery pack shell, the support plate is positioned on the battery cell assembly, and when the battery pack falls, the battery cell assembly and the battery pack shell are relatively displaced, so that the battery cell assembly is easy to damage.

Disclosure of Invention

In view of the above problems, embodiments of the present invention provide a battery pack and an electric device, which overcome or solve the above problems.

According to one aspect of an embodiment of the present invention, a battery pack is provided. The battery pack comprises a battery pack shell, an electric core assembly, a support plate and a first resin layer. The battery pack shell is provided with a battery cavity, the battery cell assembly is accommodated in the battery cavity, and the battery cell assembly comprises a plurality of battery cells stacked along a first direction. Each cell includes an electrode assembly, a cell housing for receiving the electrode assembly, the cell housing including a sealing portion and a receiving portion, and a tab electrically connected to the electrode assembly, the tab extending from the sealing portion to the cell housing. The support plate is fixed with the battery shell body and comprises protruding parts arranged between sealing parts of adjacent battery cells. The first resin layer is arranged between the battery cell shell and the protruding part and is used for fixing the protruding part and at least part of the accommodating part.

In an alternative manner, the first resin layer is formed by post-curing resin provided between the boss and the accommodating portion.

In an alternative manner, the first resin layer is disposed between the sealing portions of the adjacent cells, and the first resin layer adhesively fixes the protruding portion and at least part of the sealing portion and the receiving portion of the adjacent cells.

In an optional manner, the tab extends from the sealing part along a second direction, the second direction is perpendicular to the first direction, the sealing part comprises a first sealing part and a second sealing part, the first sealing part is connected with the accommodating part, the second sealing part extends from one end of the first sealing part away from the battery cell casing, the length of the first sealing part in a third direction is larger than that of the second sealing part in the third direction, the third direction is perpendicular to the first direction and the second direction at the same time, and the first resin layer bonds and fixes the protruding part and at least part of the first sealing part and the accommodating part of the adjacent battery cells.

In one alternative, the boss includes a base plate including a first surface and a second surface disposed opposite in a second direction along which the first seal does not extend beyond the second surface of the boss. The first sealing portion extends beyond a first surface of the protruding portion, wherein the first surface is in contact bonding with the first resin layer, and the first surface is closer to the accommodating portion than other surfaces of the protruding portion.

In an alternative mode, the battery pack comprises a second resin layer, wherein the second resin layer is arranged between one end, far away from the support plate, of the battery cell assembly and the bottom wall of the battery pack shell, and the second resin layer is used for bonding the battery cell assembly and the battery pack shell.

In an alternative manner, the plurality of electric cells includes a first electric cell and a second electric cell that are adjacently disposed, the first electric cell includes a first electrode assembly, a first electric cell housing for accommodating the first electrode assembly, and a first tab electrically connected to the first electrode assembly, and the second electric cell includes a second electrode assembly, a second electric cell housing for accommodating the second electrode assembly, and a second tab electrically connected to the second electrode assembly. The receiving portion includes a connecting portion and two side wall portions disposed opposite to each other in a first direction, the connecting portion being connected to the side wall portions and the first sealing portion. The connecting portion of the accommodating portion of the first battery cell comprises a first portion in contact connection with the first sealing portion of the first battery cell, and the first tab extends out of the first battery cell shell from the first sealing portion of the first battery cell. The connecting portion of the accommodating portion of the second battery cell comprises a second portion in contact connection with the first sealing portion of the second battery cell, and the second electrode lug extends out of the second battery cell shell from the first sealing portion of the second battery cell. The first resin layer is arranged between the protruding part and the first part and between the protruding part and the second part, and is used for bonding and fixing the protruding part and the at least first part and bonding and fixing the protruding part and the at least second part.

In an alternative mode, the battery pack further comprises a first insulating member, the first insulating member is arranged between the first sealing parts of the adjacent battery cells, and in the second direction, the first insulating member exceeds the accommodating parts of the adjacent battery cells, and the first insulating member is used for limiting resin to pass before solidification.

In an alternative, the battery pack includes a second insulating member coupled to the first insulating member, the second insulating member being disposed between the receiving portions of adjacent cells, the second insulating member being compressible to provide space for cell expansion.

In an alternative way, the width of the boss in said first direction fulfils the following condition: d2 And the distance between the sealing parts of two adjacent electric cores along the first direction is equal to or greater than n x d1, d1 is the distance between the sealing parts of two adjacent electric cores along the first direction, d2 is the width of the protruding part along the first direction, n is a preset coefficient, and n is more than or equal to 0.6 and less than 1.

In an alternative mode, the protruding portion includes a first connecting plate and a second connecting plate, the first connecting plate and the second connecting plate are both connected with the support plate, one end of the first connecting plate is connected with one end of the bottom plate, one end of the second connecting plate is connected with the other end of the bottom plate, and the bottom plate is bonded and fixed with the first resin layer.

In an alternative manner, the first connection plate and the second connection plate are both adhesively fixed with the first resin layer.

In an alternative manner, the first connection plate forms a first angle with the opposite direction along the first direction, the first angle is greater than 30 degrees and less than 80 degrees, the second connection plate forms a second angle with the first direction, and the second angle is greater than 30 degrees and less than 80 degrees.

In an alternative, the first angle and the second angle are equal.

In an alternative mode, the support plate is provided with a clamping hook, the battery pack shell is provided with a bayonet, and the clamping hook is arranged on the bayonet.

In an optional mode, the battery pack further comprises a circuit board and a conductive sheet welded with the tab, and the circuit board is fixed with the support plate and the battery pack body respectively. The circuit board set up in the support plate is kept away from the surface of electric core subassembly, the conducting strip set up in the circuit board is kept away from the surface of support plate, and the conducting strip with the circuit board electricity is connected. The support plate is provided with a support hole for the tab to pass through, the circuit board is provided with a circuit board hole for the tab to pass through, the circuit board comprises a welding part welded with the conducting strip, and the support plate is provided with a first groove for accommodating the welding part.

In an alternative mode, the battery pack comprises a fixing piece, the circuit board is provided with a first fixing hole, the support plate is provided with a second fixing hole, and the fixing piece penetrates through the first fixing hole to be fixed in the second fixing hole.

In an alternative, the first resin layer comprises a potting adhesive.

In an alternative mode, the battery pack further comprises a first buffer pad and a second buffer pad, wherein the first buffer pad and the second buffer pad are arranged on two sides of the cell assembly, and the first buffer pad and the second buffer pad are both positioned between the cell assembly and the battery pack shell.

In an alternative mode, the battery pack case is provided with a plurality of side walls, the side walls are provided with fixing grooves communicated with the battery cavity, wherein the sealing part comprises a first sealing part, the first sealing part is located in the fixing grooves when seen along a third direction, and the first sealing part, the support plate and the battery pack case are fixed by the first resin layer.

In an alternative, the first resin layer is formed by post-curing a resin between the holder plate and the receiving portion.

In an alternative mode, the accommodating portion includes a connecting portion connected with the sealing portion, the side wall includes a fixing portion, the fixing groove is formed in the fixing portion, along a second direction, a vertical distance between the connecting portion and a top surface of the fixing portion, which is close to one end of the battery cavity opening, is H1, and a vertical distance between the connecting portion and one end of the first sealing portion, which is far away from the accommodating portion, is H2, and H2 is smaller than H1.

In an alternative, the vertical distance H3, H3 > H1 of the receptacle to the top surface of the side wall of the battery chamber is along the second direction.

In an optional manner, the number of the fixing grooves on the fixing portion is multiple, one side edge of the battery core is arranged in one fixing groove, the other side edge of the battery core is arranged in the other fixing groove which is oppositely arranged, the sealing portions of two adjacent battery cores and the top surface of the containing portion enclose to form a first groove, and the first resin layer is arranged in the first groove.

In an alternative mode, the distance between the inner wall of the fixing groove and the battery cell accommodated in the fixing groove is 0.15-0.25 mm.

In an alternative way, a surface of the support plate facing the cell assembly extends to form a plurality of protruding parts, one protruding part is arranged in one first groove, and the first resin layer is used for adhering and fixing the protruding parts and at least part of the accommodating parts.

In one alternative, the battery enclosure includes a bottom wall that is connected to the side wall. The bottom wall extends along the second direction and has the bulge layer, the bulge layer the lateral wall of battery package casing and the diapire of battery package casing enclose and close and form the second groove, observe along first direction, the second groove is located the electric core subassembly with between the diapire of battery package casing. The battery pack further comprises a second resin layer, wherein the second resin layer is arranged in the second groove and is used for bonding and fixing the battery cell assembly and the battery can body.

In an alternative manner, the sealing part comprises a second sealing part, the second sealing part is obtained by extending from one end of the first sealing part away from the battery cell casing, and is located in the fixing groove when being observed along the third direction, and the fixing part is located at one side away from the opening of the battery pack casing.

In an optional mode, the support plate is provided with a clamping hook, the side wall of the battery pack shell comprises a protruding portion protruding out of the top surface of the fixing portion, the protruding portion is provided with a bayonet, the support plate is located on the top surface of the fixing portion, and the clamping hook is clamped to the bayonet.

In an alternative mode, the tab includes a connection portion and a welding portion disposed outside the cell housing, and the welding portion is connected to the conductive sheet. The support plate comprises a support body arranged between the circuit board and the battery cell assembly and a support arm which is obtained by extending from the support body, wherein the support arm extends beyond the conducting strip and is connected with a connecting part of the tab, and the Shore A hardness of the connecting part is greater than that of the support arm.

In an alternative way, the welding part passes through the support plate and is positioned at one side of the support plate.

In an alternative mode, the supporting arm is provided with an arc-shaped part, the arc-shaped part is provided with a first round angle, the thickness of the tab welding part is T1, the radius of the first round angle is R1, and R1> T1.

In an alternative mode, along the second direction, the vertical distance from one surface of the circuit board facing the battery cell assembly to the top of the supporting arm is L1, and the vertical distance from one surface of the circuit board facing the battery cell assembly to the top of the conducting strip is d, wherein L1 is larger than or equal to d.

In an alternative manner, along the second direction, the vertical distance from the conductive sheet to the supporting arm is D, and the thickness of the welding part of the tab is T1, where D > T1.

In an alternative manner, the battery cell includes a first battery cell and a second battery cell that are disposed adjacent to each other. The support arm includes first support arm and second support arm, first support arm with the second support arm set up in conducting strip both sides, first support arm is connected the connecting portion of the utmost point ear of first electric core, the second support arm is connected the connecting portion of the utmost point ear of second electric core, the first welding portion of first electric core and the second welding portion welding of second electric core are in same conducting strip.

In an alternative manner, the support plate includes a second groove disposed between the first support arm and the second support arm, and the portion of the circuit board provided with the conductive sheet is disposed in the second groove.

In an alternative manner, the circuit board is provided with a first through hole for the first support arm to extend out of the circuit board and a second through hole for the second support arm to extend out of the circuit board.

In an alternative mode, the thickness T1 of the welding part of the tab of the first battery cell is 0.10-0.2 mm, and the thickness T2 of the welding part of the tab of the second battery cell is 0.1-0.2 mm; the thickness d of the conductive sheet is 0.5-1.0 mm.

According to another aspect of the present invention, there is provided a powered device comprising a battery pack as above.

The embodiment of the invention has the beneficial effects that: different from the situation of the prior art, in the embodiment of the invention, the battery cell assembly of the battery pack is accommodated in the battery cavity of the battery pack shell, the support plate is arranged on the battery cell assembly and is fixed with the battery pack shell, the support plate is provided with the protruding part, the protruding part is arranged between the sealing parts of the adjacent battery cells of the battery cell assembly, and the first resin layer is filled between the battery cell shell of the adjacent battery cells and the protruding part. The first resin layer is used for bonding and fixing the protruding portion and the accommodating portion of at least part of the battery cell shell, so that the battery assembly, the support plate frame and the battery cell shell are fixed, when the battery pack falls, the displacement of the battery cell assembly relative to the battery cell shell is reduced, and the damage risk of the battery cell assembly is reduced. When the battery pack falls, the first resin layer can also play a role in buffering, so that the internal components of the battery are protected from being damaged.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. Like elements or portions are generally identified by like reference numerals throughout the several figures. In the drawings, elements or portions thereof are not necessarily drawn to scale.

FIG. 1 is a schematic view of the overall assembly of a battery pack according to an embodiment of the present invention;

fig. 2 is a partially exploded view of a part of the structure of a battery pack according to an embodiment of the present invention;

FIG. 3 is a cross-sectional side view taken at B-B of FIG. 1;

FIG. 4 is a schematic view, partially in section, of a battery pack housing structure of a battery pack according to an embodiment of the present invention;

fig. 5 is an exploded view showing the overall structure of a battery pack according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of the assembly of individual cells of a battery pack according to an embodiment of the invention;

FIG. 7 is an enlarged schematic view of the partial structure of FIG. 5;

fig. 8 is a partially cut-away schematic illustration of a portion of the structure of a battery pack according to an embodiment of the present invention;

FIG. 9 is an enlarged schematic view of the partial structure of FIG. 8;

fig. 10 is a schematic structural view of a support plate of a battery pack according to an embodiment of the present invention;

FIG. 11 is another angular schematic view of the structure of the support plate of the battery pack according to the embodiment of the present invention;

fig. 12 is an exploded view showing a part of the structure of a battery pack according to an embodiment of the present invention;

FIG. 13 is a partially cut-away schematic illustration of a partial structure of a battery pack according to an embodiment of the present invention;

fig. 14 is a partially cut-away, glue-filled schematic illustration of a partial structure of a battery pack according to an embodiment of the invention;

FIG. 15 is an enlarged schematic view of the partial structure of FIG. 13;

FIG. 16 is a schematic view partially in section of the overall structure of a battery pack according to an embodiment of the present invention;

FIG. 17 is an enlarged schematic view of the partial structure of FIG. 16;

FIG. 18 is an enlarged schematic view of the partial structure of FIG. 17;

FIG. 19 is a partially cut-away side view of a partial structure of a battery pack according to an embodiment of the present invention;

FIG. 20 is an enlarged schematic view of the partial structure of FIG. 19;

fig. 21 is a schematic exploded view of a partial structure of another embodiment of a battery pack according to the present invention;

FIG. 22 is an enlarged schematic view of the partial structure of FIG. 21;

FIG. 23 is a schematic view, partially in section, of the overall structure of an embodiment of a battery pack of the present invention;

FIG. 24 is an enlarged schematic view of the partial structure of FIG. 23;

fig. 25 is a partially cut-away schematic illustration of the partial structure of another embodiment of a battery pack of the present invention;

FIG. 26 is an enlarged schematic view of the partial structure of FIG. 25;

FIG. 27 is a schematic illustration of a partially cut-away glue-filled overall construction of another embodiment of a battery pack of the present invention;

fig. 28 is an enlarged schematic view of the partial structure of fig. 27.

Reference numeral 10, a battery pack case; 11. a bottom wall; 111. a bump layer; 12. a sidewall; 121. a fixing part; 121a, the top surface of the fixing part; 1211. a fixing groove; 122. a bayonet; 13. a battery cavity; 14. a second groove;

20. a cell assembly; 21. a plurality of electrical cores; 211. a cell housing; 2111. a sealing part; 2111a, a first sealing portion; 2111b, a second sealing portion; 2112. a housing part; 212. a tab; 212a, a connection part; 212b, a welded part; 21', a first cell; 212', a first cell housing; 212a', a first portion; 211', a first tab; 211a', a connection portion of the first tab; 21", a second cell; 212", a second cell housing; 212a ", a second portion; 211", second pole ear; 211a ", a connection portion of the second tab; 2211. a first groove;

30. A support plate; 31. a bracket body; 311. a boss; 3111. a bottom plate; 3111a, a first surface; 3111b, a second surface; 3112. a first connection plate; 3113. a second connecting plate; 312. a hook; 313. a first groove; 314. a bracket hole; 315. a second fixing hole; 32. a support arm; 32a, an arc-shaped portion; 321. a first support arm; 322. a second support arm;

40. a first resin layer; 50. a second resin layer; 60. a conductive sheet; 70. a circuit board; 70a, a soldering portion of the circuit board; 71. a circuit board hole; 711. a first through hole; 712. a second through hole; 72. a first fixing hole; 80. a fixing member; 90. a first cushion pad; 100. a second cushion pad; 110. a first insulating member; 120. and a second insulating member.

Detailed Description

In order that the invention may be readily understood, a more particular description thereof will be rendered by reference to specific embodiments that are illustrated in the appended drawings. It will be understood that when an element is referred to as being "fixed" to another element, it can be directly on the other element or one or more intervening elements may be present therebetween. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 3, a battery pack 01 includes: the battery pack case 10, the battery cell assembly 20, the holder plate 30, the first resin layer 40, the second resin layer 50, the conductive sheet 60, the circuit board 70, the fixing member 80, the first cushion pad 90, and the second cushion pad 100. The battery cell assembly 20 is disposed in the battery pack housing 10, the support plate 30 is disposed on the battery cell assembly 20, and the support plate 30 is fixed with the battery pack housing 10. The circuit board 70 is disposed on the support board 30, the conductive sheet 60 is disposed on the circuit board 70, and the fixing member 80 is used for fixing the circuit board 70 to the support board 30. The first resin layer 40 is disposed between the cell assembly 20 and the holder plate 30, and fixes the cell assembly 20 and the holder plate 30. The second resin layer 50 is disposed between the end of the battery cell assembly 20 remote from the holder plate 30 and the battery pack case 10, and the second resin layer 50 fixes the battery cell assembly 20 and the battery pack case 10. The first and second cushions 90 and 100 are disposed at both sides of the cell assembly 20, and the first and second cushions 90 and 100 are used to cushion the cell assembly 20. Preferably, the first resin layer 40 includes a potting adhesive.

The battery pack case 10, as shown in fig. 3 to 5, the battery pack case 10 includes a bottom wall 11 and a side wall 12 connected to the bottom wall 11, and preferably, the bottom wall 11 is perpendicular to the side wall 12. The bottom wall 11 and the side wall 12 together enclose a battery cavity 13 with an opening (not shown), wherein the battery cavity 13 is adapted to receive a battery cell assembly 20. The inner surface of the side wall 12 is provided with a fixing portion 121, the fixing portion 121 is provided with a fixing groove 1211, and the fixing groove 1211 is used for fixing the cell assembly 20. The bottom wall 11 of the battery pack case 10 is extended with a protrusion layer 111 along the second direction, and the protrusion layer 111 is used for abutting against the battery cell assembly 20 accommodated in the battery cavity 13 to support the battery cell assembly 20. The protrusion layer 111, the side wall 12 of the battery pack case 10, and the bottom wall 11 of the battery pack case 10 enclose a second groove 14, and the second groove 14 is located between the battery cell assembly 20 and the bottom wall 11 of the battery pack case 10 when viewed along the first direction, the second groove 14 may be used for filling the second resin layer 50, and the second resin layer 50 is used for bonding the battery cell assembly 20, the side wall 12, and the bottom wall 11 to fix the battery cell assembly 20, the bottom wall 11, and the side wall 12. Preferably, the second resin layer 50 is disposed between the protrusion layer 111 and the cell assembly 20, the second resin layer 50 is further disposed in the second groove 14, and the second groove 14 can accommodate more second resin layer 50, which is advantageous for better fixing the cell assembly 20 and the battery pack case 10, and in some embodiments, the second resin layer 50 can be partially disposed in a gap between adjacent cells 21, which is close to the bottom wall 11. Preferably, the second resin layer 50 includes a potting adhesive.

In some embodiments, the side wall 12 of the battery pack housing 10 is provided with a bayonet 122, the bayonet 122 being used to snap-fit the bracket plate 30, enabling the bracket plate 30 and the battery pack housing 10 to be secured.

In some embodiments, the side wall 12 of the battery pack housing 10 includes a protrusion (not shown) protruding from the top surface of the fixing portion, and the bayonet 122 is disposed on the protrusion.

The battery cell assembly 20, as shown in fig. 5-7, the battery cell assembly 20 is accommodated in the battery cavity 13. The cell assembly 20 includes a plurality of cells 21 stacked in a first direction, and specifically, a plurality of cells 21 are stacked in a thickness direction of the cells. Each cell 21 includes a cell housing 211, tabs 212, and an electrode assembly 213. The cell case 211 includes a sealing portion 2111 and a housing portion 2112, the sealing portion 2111 includes a first sealing portion 2111a and a second sealing portion 2111b extending from an end of the first sealing portion 2111a remote from the cell case 211, the first sealing portion 2111a being connected to the housing portion 2112. The electrode assembly 213 is received in the receiving portion 2112, the tab 212 is electrically connected to the electrode assembly, and the tab 212 extends out of the cell housing 211 from the sealing portion 2111 along a second direction, which is perpendicular to the first direction. The length L1 of the first sealing portion 2111a in the third direction is greater than the length L2 of the second sealing portion 2111b in the third direction, which is perpendicular to both the first direction and the second direction. The portion of the tab 212 extending out of the battery cell housing 211 includes a connection portion 212a and a welding portion 212b disposed outside the battery cell housing 211, where the connection portion 212a is connected with the welding portion 212b, and the welding portion 212b of the tab 212 is used for connecting the conductive sheet 60, so as to connect the tab 212 with the conductive sheet 60. The receiving portion 2112 includes a connecting portion 2112a and two side wall portions (not shown) disposed opposite in the first direction, and the connecting portion 2112a connects the side wall portions and the first sealing portion 2111a.

The plurality of battery cells 21 are stacked along the first direction, the sealing portions 2111 of two adjacent battery cells 21 and the connection portion 2112a of the receiving portion 2112 enclose to form a first groove 2211, the first groove 2211 is disposed along the third direction, and the first resin layer 40 is disposed in the first groove 2211. Preferably, the first groove 2211 is used to guide injection of the first resin layer 40, and also to reduce overflow of the first resin layer 40 out of the battery pack case 10.

The side wall of the battery pack case 10 is provided with a fixing groove 1211 communicating with the battery chamber 13, the fixing groove 1211 is used for accommodating the fixing battery cell 21, the position deviation of the battery cell 21 is reduced when the first resin layer 40 is injected, and preferably, the fixing groove 1211 is provided with an insulating layer for insulating and isolating the battery cell 21 from the fixing groove 1211. Preferably, the insulating layer includes an adhesive for fixing the battery cell 21 and the side wall of the battery pack case 10. In some embodiments, the inner wall of the fixed slot 1211 is spaced a small distance from the cell 21 received in the fixed slot 1211, for example: 0.2 mm to reduce the inflow of the injected first resin layer 40 into the fixing groove 1211.

In some embodiments, the number of the fixing grooves 1211 on the fixing portion 121 is plural, the side edge of one cell 21 is disposed in one fixing groove 1211, the other side edge of one cell 21 is disposed in another fixing groove 1211 disposed oppositely, or the side edges of two cells 21 are disposed in one fixing groove 1211. In another embodiment, the number of the fixing portions 121 is two, the two fixing portions 121 are respectively located on two opposite side walls 12 of the battery pack case 10, one side of the battery cell 21 is disposed in the fixing groove 1211 on one side, and the other side is disposed in the fixing groove 1211 on the other side, so as to fix both sides of the battery cell 21, which is beneficial to the stability of fixing the battery cell 21.

In some embodiments, as shown in fig. 8 and 9, the fixing part 121 includes a top surface 121a near an end of the opening of the battery chamber 13, a vertical distance from the connection portion 2112a of the receiving part 2112 to the top surface 121a is H1 in the second direction, and a vertical distance from the connection portion 2112a of the receiving part 2112 to an end of the first sealing part 2111a remote from the receiving part 2112 is H2, preferably, H2 < H1. When the first resin layer 40 is injected, the injection is usually stopped when the first resin layer 40 is substantially flush with the first sealing portion 2111a, and H2 < H1 is such that the fixing portion 121 protrudes from the first sealing portion 2111a, and the fixing portion 121 can restrict the first resin layer 40 from overflowing the battery pack case 10.

In some embodiments, the first sealing portion 2111a of the battery cell 21 is received in the fixing groove 1211, and preferably, the sealing portion 2111 is entirely located in the fixing groove 1211, and the first resin layer fixes the sealing portion 2111 to the battery pack case 10, restricting the movement of the sealing portion 2111, which is advantageous for improving the stability of the battery pack. In the second direction, the vertical distance from the accommodation portion 2112 to the top surface of the side wall 12 of the battery chamber 13 is H3, and preferably, H3 > H1.

In some embodiments, the length of the first sealing portion 2111a is less than the length of the second sealing portion 2111b in the second direction, so that the battery assembly is not only aesthetically pleasing as a whole, but also saves material.

The conductive sheet 60, as shown in fig. 5, the conductive sheet 60 is made of a material having conductive properties, such as: copper, aluminum, iron, and the like. In some embodiments, the thickness d of the conductive sheet 60 is 0.5 millimeters.

The circuit board 70, as shown in fig. 5, the conductive sheet 60 is disposed on the circuit board 70, and the conductive sheet 60 is electrically connected to the circuit board 70.

The support plate 30 is, as shown in fig. 5, 10, 11 and 12, disposed on the battery cell assembly 20, and the support plate 30 is fixed to the battery pack case 10. The holder plate 30 includes a holder body 31 and a support arm 32 extending from the holder body 31 in the second direction. Preferably, the support plate 30 is located on the top surface of the fixing portion 121.

The bracket body 31 is provided with a plurality of protruding portions 311 and hooks 312, and the protruding portions are formed by extending from a surface of the bracket body 31 facing the battery cell assembly 20. Preferably, along the second direction, the supporting arm 32 and the protruding portion 311 are disposed on two opposite sides of the bracket body 31, and the circuit board 70 is specifically disposed on the surface of the bracket body away from the battery cell assembly 20. The clamping hooks 312 are clamped with the bayonets 122 on the battery pack housing 10, so that the support plate 30 and the battery pack housing 10 are fixed.

It will be appreciated that: the manner in which the holder plate 30 is fixed to the battery pack case 10 is not limited to the above, but may be other manners, such as: screw fixation, welded fixation, etc.

As shown in fig. 13-15, the protruding portion 311 is disposed between the sealing portions 2111 of the adjacent cells 21, when the first resin layer 40 is disposed between the cell housing 211 and the support plate 30, the protruding portion 311 is bonded to the first resin layer 40, and the protruding portion 311 is used for bonding and fixing the cell housing 211 and the support plate 30, so that the usage amount of the first resin layer 40 can be saved, and the cost can be reduced.

Specifically, the boss 311 includes a base plate 3111, a first connection plate 3112, and a second connection plate 3113. One end of the first connection plate 3112 is connected to one end of the base plate 3111, one end of the second connection plate 3113 is connected to the other end of the base plate 3111, and the other ends of the first connection plate 3112 and the second connection plate 3113 are both connected to the bracket body 31. Preferably, the first connection plate 3112, the base plate 3111 and the second connection plate 3113 are all adhesively fixed to the first resin layer 40, so that the protruding portion 311 has a plurality of faces adhesively bonded to the first resin layer 40, thereby making the adhesion between the cell housing 211 and the protruding portion 311 stronger.

As shown in fig. 16-20, the base plate 3111 includes a first surface 3111a and a second surface 3111b disposed opposite in a second direction. The first surface 3111a is closer to the accommodating portion 2112 than other surfaces of the protruding portion 311, and the first surface 3111a is in contact with and bonded to the first resin layer 40. In the second direction, the first sealing portion 2111a extends beyond the first surface 3111a of the boss 311. Here, the "other surface" refers to the other surface of the protruding part 311 than the first surface 3111a of the protruding part 311, and when the protruding part 311 and the cell case 211 are bonded and fixed with the first resin layer 40, the first surface 3111a of the protruding part 311 is preferentially bonded with the first resin layer 40 than the other surface of the protruding part 311.

In some embodiments, a first angle 1 is formed between the first connection plate 3112 and the direction opposite to the first direction, and a second angle 2 is formed between the second connection plate 3113 and the first direction, and the first angle and the second angle are both greater than 30 degrees and less than 80 degrees, so that the stress intensity of the protruding portion 311 is within a safety range. In some embodiments, the first angle is equal to the second angle, so that the stress of the protruding portion 311 is balanced and the protruding portion is not easy to damage.

In some embodiments, the width of the boss 311 in the first direction satisfies the condition: d2 D1, where d1 is the distance between the sealing portions 2111a of two adjacent cells and d2 is the width of the protruding portion 311 along the first direction. Preferably, 0.6.ltoreq.n < 1, and the convex portion 311 is advantageously provided between the sealing portions 2111 of the adjacent cells 21. A gap is formed between the protruding portion 311 and the sealing portion 2111 of the adjacent battery cell 21, preferably, the first resin layer 40 includes a pouring sealant, the pouring sealant is disposed on the gap and cured to form the first resin layer 40, and the first resin layer 40 bonds and fixes the battery cell 21 and the support plate 30, so as to reduce movement of the battery cell 21.

In some embodiments, referring again to fig. 15, a surface of the holder body 31 facing away from the cell assembly 20 is provided with a first recess 313. The first recess 313 accommodates a soldering portion 70a of the circuit board 70, the soldering portion 70a being for soldering with the conductive sheet 60.

In some embodiments, as shown in fig. 5 and 10, the holder body 31 is provided with holder holes 314 and the circuit board 70 is provided with circuit board holes 71. The bracket hole 314 and the circuit board hole 71 are electrically connected to the conductive sheet 60 after passing through the solder portion of the tab 212.

In some embodiments, the circuit board 70 is provided with a first fixing hole 72, the holder plate 30 is provided with a second fixing hole 315, and the fixing member 80 is fixed to the second fixing hole 315 after passing through the first fixing hole 72, thereby fixing the circuit board 70 and the holder plate 30. In a preferred embodiment, the fixing member 80 may be a screw, and the first fixing hole 72 and the second fixing hole 315 are screw holes, and the screw is screwed to the second fixing hole 315 through the first fixing hole 72, so as to fix the circuit board 70 and the bracket board 30.

It will be appreciated that the manner of fixing between the circuit board 70 and the bracket board 30 is not limited to the above, but may be other manners, such as: riveting, glue fixing, snap-fit fixing, and the like.

As shown in fig. 16-18, in some embodiments, in the second direction, the supporting arm 32 extends beyond the conductive sheet 60, the supporting arm 32 is connected to the connection portion 212a of the tab 212, and when the tab 212 is bent, the supporting arm 32 can play a role in supporting and protecting the tab 212, so that the tab 212 is reduced from being directly abutted against the tab 212 by the conductive sheet 60 when being bent, and stress concentration of the tab 212 is caused, thereby causing breakage of the tab 212.

In some embodiments, the shore a hardness of the connection portion 212a is greater than the shore a hardness of the support arm 32, the shore a hardness of the support arm 32 is smaller, and when the tab 212 contacts the support arm 32 to generate a larger stress, the tab 212 is not easy to break, and the support arm 32 can protect the tab 212.

It should be noted that: the Shore hardness is also called as Shore hardness, and represents one method of the hardness grades of metal, plastic and rubber materials, the Shore hardness is divided into four types of A type, B type, C type and D type, and the Shore A hardness is taken as one of the Shore A hardness and the B type.

In some embodiments, the end of the support arm 32 beyond the conductive sheet 60 is provided with an arc portion 32a, the arc portion 32a is provided with a first rounded corner (not labeled), the thickness of the welding portion 212b of the tab 212 is T1, and the radius of the first rounded corner is R1. Preferably, R1> T1. When the tab 212 is bent, the arc-shaped portion 32a is beneficial to guiding the tab 212 to bend in an arc shape, so that stress concentration is reduced, and damage to the tab 212 is reduced.

In some embodiments, support arm 32 satisfies the condition: l1 is equal to or greater than d, and along the second direction, L1 is the vertical distance from a surface of the circuit board 70 facing the cell assembly 20 to the top of the arc-shaped portion 32a, and d is the vertical distance from a surface of the circuit board 70 facing the cell assembly 20 to the top of the conductive sheet 60. The arc-shaped part 32a of the supporting arm 32 extends out of the circuit board 70 and exceeds the conductive sheet 60 on the circuit board 70, and when the tab 212 is bent, the supporting arm 32 exceeding the conductive sheet 60 can support and protect the tab 212, so that the breakage of the tab 212 caused by the contact of the tab 212 and the corner of the conductive sheet 60 is reduced.

In some embodiments, support arm 32 satisfies the condition D > T1, where D is the perpendicular distance of conductive tab 60 from support arm 32 in the first direction and T1 is the thickness of weld 212b of tab 212. The distance between the support arm 32 and the conductive sheet 60 reduces the contact between the tab 212 and the corner of the conductive sheet 60 when bending, and meanwhile, the distance between the support arm 32 and the conductive sheet 60 can facilitate the subsequent processing of the tab 212, which is beneficial to the process production.

As for the first resin layer 40 described above, as shown in fig. 14 to 16, the first resin layer 40 is provided between the cell case 211 and the protruding portion 311, and the first resin layer 40 is used to adhesively fix the protruding portion 311 and at least part of the receiving portion 2112 so as to fix the cell case 211 and the receiving portion 2112. The first resin layer 40 also serves as a buffer to reduce the chance of damage to the battery pack when the battery pack falls or other conditions cause significant impact. Specifically, at the moment when the battery pack 01 falls down towards the ground or heavy impact is caused by other working conditions, the gravity of the battery core 21 impacts towards the support plate 30, and since the first resin layer 40 is arranged between the battery core 21 and the support plate 30, the first resin layer 40 can buffer and eliminate part of the gravity or other heavy impact of the battery core 21, the rest of impact force is transmitted to the support plate 30 through the first resin layer 40, and part of impact force transmitted to the support plate 30 causes the support plate 30 to have a tendency of moving away from the battery core 21, and the support plate 30 and the battery core 21 are bonded and fixed through the first resin layer 40, at the moment, elastic restoring force exists between the first resin layer 40 and the support plate 30, and the elastic restoring force can eliminate part of impact force. In addition, the bracket plate 30 is fixed to the battery pack case 10, and a part of the impact force transmitted to the bracket plate 30 can be transmitted to the battery pack case 10. It is understood that the first resin layer 40 can reduce the probability of damage to the battery pack 01 at the moment when the battery pack 01 falls toward the ground or other conditions cause a significant impact.

In some embodiments, the first resin layer 40 is disposed between the sealing portions 2111 of the adjacent cells 21, and the first resin layer 40 adhesively secures the protruding portion 311 and at least a portion of the sealing portions 2111, the receiving portions 2112 of the adjacent cells 21, thereby adhesively securing the protruding portion 311 of the holder plate 30 and the cell housing 211 of the cell assembly 20.

As shown in fig. 16, the second resin layer 50 is disposed between the end of the battery cell assembly 20 away from the support plate 30 and the bottom wall 11 of the battery pack case 10, and the second resin layer 50 is used for bonding the battery cell 21 and the battery pack case 10, so as to fix the battery cell assembly 20 and the battery pack case 10, so that when the battery pack 01 falls or other working conditions cause significant impact, the relative displacement of the battery cell assembly 20 with respect to the battery pack case 10 is reduced. In addition, the second resin layer 50 is flexible, has elastic deformation property, and can play a role of buffering when the battery pack 01 falls down or when a significant impact occurs due to other working conditions.

In some embodiments, as shown in fig. 4, a second resin layer 50 is disposed in the second groove 14, and the second resin layer 50 is used to adhesively fix the cell assembly 20 and the bottom wall 11 of the battery pack case 10.

For the first and second cushions 90 and 100 described above, as shown in fig. 2, the first and second cushions 90 and 100 are disposed at both sides of the battery cell assembly 20, and the first and second cushions 90 and 100 are located between the battery cell assembly 20 and the battery pack case 10. When the battery pack falls, the first buffer pad 90 and the second buffer pad 100 play a role in buffering and protecting the battery cell assembly 20 inside the battery pack, and damage caused by direct collision between the battery cell assembly 20 and the battery pack shell 10 is reduced.

In some embodiments, as shown in fig. 5 and 13-15, the battery pack 01 further includes a first insulating member 110 and a second insulating member 120, and the second insulating member 120 is connected to the first insulating member 110.

The first insulator 110 and the second insulator 120 are disposed between the first sealing portions 2111a of the adjacent cells 21, and the first insulator 110 extends beyond the accommodating portion 2112 of the adjacent cells 21 along the second direction, and the first insulator 110 is used for restricting the resin before curing from passing through and reducing the flow of the first resin layer 40 between the accommodating portions 2112 of the adjacent cells 21, and meanwhile, when the first resin layer 40 is disposed between the first sealing portions 2111a of the adjacent cells 21, the first insulator 110 occupies a part of the volume, so that the usage amount of the first resin layer 40 can be saved. In addition, the second insulating member 120 may be compressed to provide a space for the expansion of the battery cells 21, and at the same time, when the first resin layer 40 is disposed between the first sealing portions 2111a of the adjacent battery cells 21, the second insulating member 120 may reduce the inflow of the first resin layer 40 between the receiving portions 2112 of the adjacent battery cells 21, thereby reducing restriction of the expansion of the battery cells 21.

It should be noted that: typically, two adjacent cells 21 are grouped in the cell assembly 20, and for convenience of readers to understand the concept of the present invention, the following description will take two adjacent cells 21 as an example:

for convenience of description, as shown in fig. 21-24, two adjacent cells 21 are respectively referred to as a first cell 21 'and a second cell 21", and the electrode assemblies, the cell cases, and the tabs of the first cell 21' are respectively referred to as a first electrode assembly (not shown), a first tab 211', and a first cell case 212' (not labeled), and the electrode assemblies, the cell cases, and the tabs of the second cell 21" are respectively referred to as a second electrode assembly (not shown), a second tab 211", and a second cell case 212" (not labeled). In other words, the plurality of battery cells 21 includes a first battery cell 21 'and a second battery cell 21", the first battery cell 21' including a first electrode assembly, a first battery cell housing 212 'for accommodating the first electrode assembly, and a first tab 211' electrically connected to the first electrode assembly. The second battery cell 21 "includes a second electrode assembly, a second battery cell housing 212" for accommodating the second electrode assembly, and a second tab 211 "electrically connected to the second electrode assembly. Further, the circuit board hole 71 includes a first through hole 711 and a second through hole 712. The support arm 32 includes a first support arm 321 and a second support arm 322. The bracket apertures 314 include a first bracket aperture (not shown) and a second bracket aperture (not shown).

The welding portion of the first cell 21' is welded to the conductive sheet 60 after passing through the first bracket hole and the first through hole 711, and the welding portion of the second tab 211 "of the second cell 21" is welded to the conductive sheet 60 after passing through the second bracket hole and the second through hole 712. The first support arm 321 and the second support arm 322 are disposed at two sides of the conductive sheet 60, and the arc portion of the first support arm 321 extends out of the conductive sheet 60 after passing through the first through hole 711 of the circuit board 70, and the arc portion of the first support arm 321 is connected to the connection portion 211a 'of the first tab 211' of the first battery 21', so as to connect the first support arm 321 to the connection portion 211a' of the first tab 211 'of the first battery 21'. The arc portion of the second support arm 322 extends out of the conductive sheet 60 after passing through the second through hole 712 of the circuit board 70, and the arc portion of the second support arm 322 is connected with the connection portion 211a "of the second tab 211" of the second battery cell 21", so as to realize the connection of the second support arm 322 with the connection portion 211a" of the second tab 211 "of the second battery cell 21".

In some embodiments, the thickness T1 of the welded portion of the first tab 211 'of the first cell 21' is 0.15 mm, and the thickness T2 of the welded portion of the second tab 211 "of the second cell 21" is 0.2 mm.

In some embodiments, as shown in fig. 25-28, the connecting portion of the receiving portion of the first cell 21 'includes a first portion 212a' that is in contact with the first sealing portion 2111a of the first cell 21', and the first tab 211' extends from the first sealing portion of the first cell 21 'to the first cell housing 212'. The first portion 212a 'may be used to fill the first resin layer 40, so as to fix the first cell 21' and the support plate 30 by bonding. The connection portion of the accommodation portion 2112 of the second cell 21 "includes a second portion 212a" in contact connection with the first sealing portion of the second cell 21", and the second tab 211" extends from the first sealing portion 2111a of the second cell 21 "out of the second cell housing 212". Wherein the second portion 212a "may be used to fill the first resin layer 40 to achieve an adhesive securement of the second cell 21" to the mounting plate 30.

In some embodiments, the first resin layer 40 is disposed between the boss 311 and the first portion 212a 'and between the boss 311 and the second portion 212a ", the first resin layer 40 is used to adhesively secure the boss 311 and at least the first portion 212a', and the first resin layer 40 is used to adhesively secure the boss 311 and at least the second portion 212 a".

In some embodiments, a second recess (not shown) is provided between the first support arm 321 and the second support arm 322, and a portion of the circuit board 70 having the conductive sheet 60 disposed thereon is snapped into the second recess. The second groove can facilitate the part of the circuit board 70 provided with the conductive sheet 60 to be clamped in, and can ensure that the first support arm 321 and the second support arm 322 are always in a state of exceeding the conductive sheet 60. It will be appreciated that the second recess is not limited to the portion of the circuit board 70 where the conductive sheet 60 is disposed, but may also be provided with other substances, such as: the insulating filler may provide support protection for the circuit board 70.

In the embodiment of the invention, the battery cell assembly of the battery pack is accommodated in the battery cavity of the battery pack shell, the support plate is arranged on the battery cell assembly and is fixed with the battery pack shell, the support plate is provided with the protruding part, the protruding part is arranged between the sealing parts of the adjacent battery cells of the battery cell assembly, and the first resin layer is filled between the battery cell shell and the protruding part of the adjacent battery cells. The first resin layer is used for bonding and fixing the protruding portion and the accommodating portion of at least part of the battery cell shell, so that the battery assembly, the support plate frame and the battery cell shell are fixed, when the battery pack falls, the displacement of the battery cell assembly relative to the battery cell shell is reduced, and the damage risk of the battery cell assembly is reduced. When the battery pack falls, the first resin layer can also play a role in buffering, so that the internal components of the battery are protected from being damaged.

The invention also provides an embodiment of the electric equipment, which comprises the battery pack, wherein the electric equipment comprises, but is not limited to, a two-wheeled electric vehicle, an energy storage device, a handheld electric tool and the like, and the functions and the structures of the battery pack can be referred to the embodiment and are not repeated herein.

The foregoing is only illustrative of the present invention and is not to be construed as limiting the scope of the invention, and all equivalent structures or equivalent flow modifications which may be made by the teachings of the present invention and the accompanying drawings or which may be directly or indirectly employed in other related art are within the scope of the invention.

Claims

A battery pack, comprising:

a battery pack housing provided with a battery cavity;

the battery cell assembly is accommodated in the battery cavity and comprises a plurality of battery cells stacked along a first direction;

each cell includes an electrode assembly, a cell housing for housing the electrode assembly, the cell housing including a sealing portion and a housing portion, and a tab electrically connected to the electrode assembly, the tab extending from the sealing portion out of the cell housing;

the support plate is fixed with the battery pack shell and comprises a protruding part arranged between sealing parts of adjacent battery cells;

The first resin layer is arranged between the battery cell shell and the protruding part and is used for bonding and fixing the protruding part and at least part of the containing part.
The battery pack of claim 1, wherein the battery pack comprises a plurality of battery cells,

the first resin layer is formed by post-curing resin between the protruding portion and the accommodating portion.
The battery pack of claim 2, wherein the battery pack comprises a plurality of battery cells,

the first resin layer is arranged between the sealing parts of the adjacent cells, and the first resin layer bonds and fixes the protruding part and at least part of the sealing parts and the accommodating parts of the adjacent cells.
The battery pack of claim 2, wherein the battery pack comprises a plurality of battery cells,

the electrode lug extends out of the battery cell shell along a second direction from the sealing part, the second direction is perpendicular to the first direction, the sealing part comprises a first sealing part and a second sealing part, the first sealing part is connected with the containing part, the second sealing part extends from one end of the first sealing part far away from the battery cell shell, the length of the first sealing part in the third direction is larger than that of the second sealing part in the third direction, the third direction is perpendicular to the first direction and the De-Japanese direction, and the first resin layer is used for fixedly bonding the protruding part and the first sealing part and the accommodating part of at least part of adjacent cells.
The battery pack of claim 4, wherein the battery pack comprises a plurality of battery cells,

the protruding portion comprises a bottom plate, the bottom plate comprises a first surface and a second surface which are oppositely arranged along a second direction, the first sealing portion does not exceed the second surface of the protruding portion along the second direction, the first sealing portion exceeds the first surface of the protruding portion, the first surface is in contact adhesion with the first resin layer, and the first surface is closer to the accommodating portion than other surfaces of the protruding portion.
The battery pack of claim 5, wherein the battery pack comprises a plurality of battery cells,

the battery pack comprises a battery cell assembly, a support plate and a battery pack shell, wherein the battery cell assembly is arranged on the battery pack shell, the battery pack shell is provided with a bottom wall, and the bottom wall is provided with a first resin layer.
The battery pack of claim 5, wherein the battery pack comprises a plurality of battery cells,

the plurality of battery cells comprises a first battery cell and a second battery cell which are adjacently arranged, the first battery cell comprises a first electrode assembly, a first battery cell shell for accommodating the first electrode assembly and a first tab electrically connected to the first electrode assembly, and the second battery cell comprises a second electrode assembly, a second battery cell shell for accommodating the second electrode assembly and a second tab electrically connected to the second electrode assembly;

The accommodating portion includes a connecting portion and a side wall portion disposed opposite in a first direction, the connecting portion being connected with the side wall portion and the first sealing portion;

the connecting part of the accommodating part of the first battery cell comprises a first part in contact connection with the first sealing part of the first battery cell, and the first tab extends out of the first battery cell shell from the first sealing part of the first battery cell;

the connecting part of the accommodating part of the second battery cell comprises a second part in contact connection with the first sealing part of the second battery cell, and the second electrode lug extends out of the second battery cell shell from the first sealing part of the second battery cell;

the first resin layer is arranged between the protruding portion and the first portion, the first resin layer is used for adhering and fixing the protruding portion and at least the first portion, the first resin layer is arranged between the protruding portion and the second portion, and the first resin layer is used for adhering and fixing the protruding portion and at least the second portion.
The battery pack of claim 7, wherein the battery pack comprises a plurality of battery cells,

the battery cell structure further comprises a first insulating piece, wherein the first insulating piece is arranged between the first sealing parts of the adjacent battery cells, extends beyond the accommodating parts of the adjacent battery cells along the second direction, and is used for limiting resin to pass through before solidification.
The battery pack of claim 8, wherein the battery pack comprises a plurality of battery cells,

the battery cell comprises a first insulating piece and a second insulating piece, wherein the first insulating piece is connected with the second insulating piece, the second insulating piece is arranged between accommodating parts of adjacent battery cells, and the second insulating piece can be compressed to provide space for expansion of the battery cells.
The battery pack of claim 5, wherein the width of the boss in the first direction satisfies the following condition:

d2≥n*d1

d1 is the distance between the sealing parts of two adjacent battery cells along the first direction, d2 is the width of the protruding part along the first direction, n is a preset coefficient, and n is more than or equal to 0.6 and less than 1.
The battery pack according to claim 5, wherein the convex portion includes a first connection plate and a second connection plate, both of which are connected to the support plate, one end of the first connection plate is connected to one end of the bottom plate, one end of the second connection plate is connected to the other end of the bottom plate, and the bottom plate is bonded to the first resin layer.
The battery pack of claim 11, wherein the battery pack comprises a plurality of battery cells,

the first connecting plate and the second connecting plate are bonded and fixed with the first resin layer.
The battery pack of claim 11, wherein the battery pack comprises a plurality of battery cells,

the first connecting plate forms a first included angle with the opposite direction of the first direction, the first included angle is larger than 30 degrees and smaller than 80 degrees, the second connecting plate forms a second included angle with the first direction, and the second included angle is larger than 30 degrees and smaller than 80 degrees.
The battery pack of claim 13, wherein the first included angle and the second included angle are equal.
The battery pack of any one of claims 1-14, wherein,

the support plate is provided with a clamping hook, the battery pack shell is provided with a bayonet, and the clamping hook is arranged on the bayonet.
The battery pack of any one of claims 1-14, further comprising a circuit board and a conductive tab welded to the tab;

the circuit board is arranged on the surface, far away from the battery cell assembly, of the support plate, the conducting strip is arranged on the surface, far away from the support plate, of the circuit board, and the conducting strip is electrically connected with the circuit board;

the support plate is provided with a support hole for the tab to pass through, the circuit board is provided with a circuit board hole for the tab to pass through, the circuit board comprises a welding part welded with the conducting strip, and the support plate is provided with a first groove for accommodating the welding part.
The battery pack of any one of claims 1-14, wherein,

the circuit board is provided with a first fixing hole, the support plate is provided with a second fixing hole, and the fixing piece penetrates through the first fixing hole to be fixed in the second fixing hole.
The battery pack of any one of claims 1-14, wherein,

the first resin layer includes a potting adhesive.
A powered device comprising a battery pack as claimed in any one of claims 1 to 18.