CN113363639A

CN113363639A - Battery bottom supporting plate and battery

Info

Publication number: CN113363639A
Application number: CN202110621613.7A
Authority: CN
Inventors: 周杰; 杨伟; 袁铖; 张耀
Original assignee: Sunwoda Electric Vehicle Battery Co Ltd
Current assignee: Xinwangda Power Technology Co ltd
Priority date: 2021-06-03
Filing date: 2021-06-03
Publication date: 2021-09-07
Anticipated expiration: 2041-06-03
Also published as: CN113363639B

Abstract

The embodiment of the application provides a battery bottom plate and battery, wherein, battery bottom plate includes: the liquid dispenser comprises a main body part, wherein a first groove is formed in the main body part, and a gap is formed in the main body part by the first groove so that liquid can flow into the first groove through the gap; the at least two limiting parts are connected with the main body part and arranged on two opposite sides of the main body part. Through set up at least one spacing portion on the side at battery bottom plate, spacing portion sets up between electric core and casing and carry on spacingly to electric core for relative movement does not take place between electric core and the casing, has restricted the displacement of electric core utmost point group in electric core casing, has solved and has collided the problem that leads to naked electric core damaged between naked electric core and the shell, has improved the resistant vibration performance of electric core utmost point group.

Description

Battery bottom supporting plate and battery

Technical Field

The invention relates to the technical field of power batteries, in particular to a battery bottom supporting plate and a battery.

Background

With the vigorous development of the new energy industry and the further popularization of new energy electric vehicles, the new energy also gradually replaces the traditional environment pollution type energy, and the battery as a representative of the new energy is also gradually accepted by mass manufacturers and consumers. In the battery processing procedure, in order to guarantee that electrolyte can fully infiltrate naked electric core, can leave certain clearance between naked electric core and casing usually, make electrolyte can flow into the casing bottom from the notes liquid hole at casing top to the through-hole entering through the casing bottom fully infiltrates naked electric core.

However, there is the clearance between naked electric core and the casing, can make to bump between naked electric core and the shell, lead to naked electric core damaged.

Disclosure of Invention

The embodiment of the application provides a battery bottom plate and a power battery, and can solve the problem that a bare cell is damaged due to the existence of a gap between the bare cell and a shell.

The embodiment of the application provides a battery bottom plate, includes:

the liquid dispenser comprises a main body part, wherein a first groove is formed in the main body part, and a gap is formed in the main body part by the first groove so that liquid can flow into the first groove through the gap;

the at least two limiting parts are connected with the main body part and arranged on two opposite sides of the main body part.

In some embodiments of the present invention, the,

at least two limiting grooves are formed in the side edge of the main body, and each limiting portion is matched with each limiting groove so that the limiting portions can be connected with the main body in a clamped mode.

In some embodiments, the main body portion includes a first side and a second side that are opposite to each other, and a third side and a fourth side that are opposite to each other, and the first side, the third side, the second side, and the fourth side are sequentially connected to each other;

the first groove is arranged along a first direction from the first side edge to the second side edge, and a notch is formed on at least one of the first side edge and the second side edge by the first groove; or

The first groove is arranged along a second direction of the third side edge towards the fourth side edge, and the first groove is arranged on at least one of the third side edge and the fourth side edge to form a notch.

In some embodiments, the limiting portion includes a limiting boss and an extending portion, and the extending portion and the limiting boss are fixedly connected in a direction perpendicular to the first direction.

In some embodiments, in the first direction, the main body portion is provided with a second groove, the limit boss is provided with a third groove therethrough, the third groove communicates with the second groove, and in a second direction from the third side to the fourth side, the limit boss is provided with a fourth groove, the third groove communicates with the fourth groove and the fourth groove communicates with the first groove, so that liquid flows into the first groove through the second groove, the third groove, and the fourth groove.

In some embodiments, the first groove comprises at least one first groove segment and at least one second groove segment;

the first groove section is arranged along the first direction;

the second groove section is arranged along the second direction, and the first groove section is communicated with the second groove section.

In some embodiments, the body portion and the restraint portion are integrally formed.

In some embodiments, the body portion includes a first portion, a second portion, and a third portion connected in sequence, and the first groove is formed in the second portion;

at least one of the first portion, the second portion and the third portion is formed with a first through hole, and the first through hole is communicated with the first groove.

An embodiment of the present application further provides a battery, where the battery includes:

a housing having a receiving cavity;

the electric core assembly is arranged in the accommodating cavity; and

the battery bottom plate, the battery bottom plate be above-mentioned arbitrary battery bottom plate, the battery bottom plate set up in the electric core subassembly with between the casing, so that the spacing portion of battery bottom plate is right the electric core subassembly carries on spacingly.

In some embodiments, the bottom of the electric core assembly is provided with at least one second through hole, the second through hole and the first groove are arranged in a staggered mode, and liquid in the first groove can enter the electric core assembly through the second through hole.

The embodiment of the application provides a battery bottom plate, through set up at least one spacing portion on the side at battery bottom plate, spacing portion sets up between electric core and casing and carries on spacingly to electric core for relative movement does not take place between electric core and the casing, has restricted the displacement of electric core utmost point group in electric core casing, has solved and has collided the problem that leads to naked electric core damaged between naked electric core and the shell, has improved the resistant vibration performance of electric core utmost point group.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments will be briefly introduced below. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

Fig. 1 is a first structural schematic diagram of a battery bottom bracket according to an embodiment of the present disclosure.

Fig. 2 is a schematic diagram of a second structure of a battery bottom bracket according to an embodiment of the present disclosure.

Fig. 3 is a schematic structural diagram of a third structure of a battery bottom bracket according to an embodiment of the present application.

Fig. 4 is a partially enlarged view of a portion a of the battery bottom plate shown in fig. 3.

Fig. 5 is a schematic view of a first structure of a main body portion of a battery bottom bracket according to an embodiment of the present disclosure.

Fig. 6 is a second structural schematic diagram of the main body portion of the battery bottom bracket according to the embodiment of the present application.

Fig. 7 is a schematic structural diagram of a third structure of a main body portion in a battery bottom bracket according to an embodiment of the present application.

Fig. 8 is a schematic diagram of a fourth structure of the main body portion of the battery bottom bracket according to the embodiment of the present application.

Fig. 9 is a schematic structural diagram of a fifth structure of a main body portion in a battery bottom bracket according to an embodiment of the present application.

Fig. 10 is a schematic view of a sixth structure of a main body portion of a battery bottom bracket according to an embodiment of the present application.

Fig. 11 is a schematic diagram of a seventh structure of the main body portion of the battery bottom bracket according to the embodiment of the present application.

Fig. 12 is an eighth structural schematic diagram of the main body portion in the battery bottom bracket provided in the embodiment of the present application.

Fig. 13 is a schematic view of a first structure of a battery according to an embodiment of the present disclosure.

Fig. 14 is an exploded view of the battery of fig. 13.

Fig. 15 is a schematic diagram of a second structure of a battery according to an embodiment of the present application.

Fig. 16 is a schematic cross-sectional view of the battery shown in fig. 15 taken along the direction B-B.

Fig. 17 is a partially enlarged view of a portion of the cell C shown in fig. 16.

Description of the reference numerals

1-battery bottom supporting plate 10-main body part 110-first groove

111-first groove section 112-second groove section 130-retaining groove 140-first side

150-second side 160-third side 170-fourth side 180-first portion 190-second portion

210-third portion 220-first through hole 230-second groove

40-limiting part 410-limiting boss 411-third groove

412-fourth groove 413-first sidewall 414-second sidewall

415-third side wall 416-fourth side wall 420-extension

6-battery 61-shell 62-electric core component

63-insulation 630-second through hole 64-cell top cover

65-liquid injection hole unit 66-explosion-proof valve 67-positive electrode conducting unit

68-negative conductive element

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The embodiment of the application provides a battery bottom supporting plate and a battery. Wherein, this battery bottom plate sets up between naked electric core and casing, is provided with spacing portion on the relative side of this battery bottom plate, and this spacing portion has carried on spacingly to electric core subassembly, makes electric core subassembly no longer displacement in the casing, has avoided the condition that bumps between electric core subassembly and the casing and leads to electric core subassembly damage. And be provided with the recess on this battery bottom plate, the through-hole that sets up on this recess and the electric core subassembly staggers to be connected, both can make electrolyte flow in the electric core subassembly through recess and through-hole, soaks naked electric core, and the setting of staggering of through-hole and recess also can avoid naked electric core pole piece or metallic foreign matter to link to each other naked electric core and aluminum hull through the bottom through-hole, takes place the problem of short circuit inefficacy. The following description will be made in detail with reference to drawings.

Referring to fig. 1 to 4, fig. 1 is a first structural schematic diagram of a battery bottom plate provided in the embodiment of the present application, fig. 2 is a second structural schematic diagram of the battery bottom plate provided in the embodiment of the present application, please continue to refer to fig. 3 to 4, and fig. 3 is a third structural schematic diagram of the battery bottom plate provided in the embodiment of the present application. Fig. 4 is a partially enlarged view of a portion a of the battery bottom plate shown in fig. 3. The battery bottom bracket plate 1 includes a main body portion 10 and a stopper portion 40 connected to the main body portion 10. Wherein, two are no less than to spacing portion 40's number, and two at least spacing portions 40 set up at two relative sides of main part 10, carry on spacingly to the electric core subassembly that sets up at the casing, make the electric core subassembly can not remove in the casing.

The main body 10 includes a first portion 180, a second portion 190 and a third portion 210 connected in sequence, the second portion 190 is provided with a first groove 110, and the first groove 110 is formed with a notch on the main body 10. By arranging the first groove 110 on the second portion 190, the electrolyte in the casing is guided into the cell assembly through the first groove 110, and the cell assembly is soaked.

It should be noted that the position of the first groove 110 on the main body 10 is not particularly limited. For example, first groove 110 may be disposed on both first portion 180 and third portion 210, first groove 110 may be disposed on both first portion 180, second portion 190, and third portion 210, or first groove 110 may be disposed on first portion 180, second portion 190, or third portion 210.

It should be noted that the number of the first grooves 110 disposed on the main body 10 is not specifically limited, and it is only required to ensure that the electrolyte in the casing can be introduced into the electric core assembly through the first grooves 110, so as to infiltrate the electric core assembly.

The number of the stopper portions 40 may be an odd number greater than two or an even number greater than or equal to two. It will be understood that the number of the position restricting portions 40 distributed on both sides of the main body portion 10 may be different. For example, 3 stopper portions 40 may be provided on one side of the main body 10, and 4 stopper portions 40 may be provided on the other side of the main body opposite to the side. Spacing portion 40 that sets up crisscross each other can reduce the number that spacing portion 40 set up under the circumstances of guaranteeing electric core subassembly stability, increases the clearance that flows.

The position of the stopper 40 provided on the main body 10 is not particularly limited in this application. Specifically, the limiting parts 40 may be disposed on two sides of the main body 10, which are disposed oppositely, to limit the electric core assembly in a certain direction in the casing. The position-limiting parts 40 may be disposed on four sides of the main body 10 to limit the electric core assembly in the horizontal direction in the housing. For example, when the number of the stopper portions 40 is six, three stopper portions 40 may be symmetrically provided on two sides of the main body 10 facing each other. Three stopper portions 40 may be asymmetrically provided on two opposite sides of the main body portion 10, respectively. The stopper portions 40 may be asymmetrically provided on the two opposite sides of the main body 10. The stopper portions 40 may be provided on the four sides of the main body 10. It should be noted that, the specific position and number of the limiting portion 40 are not limited in the present application, and it is only necessary to ensure that the limiting portion 40 is disposed on at least two opposite sides of the main body portion 10, and can limit the movement of the electric core assembly in the housing.

The limiting part 40 comprises a limiting boss 410 and an extending part 420, and the limiting boss 410 and the extending part 420 can be integrally formed or detachably connected. The extension part 420 is disposed between the electric core assembly and the housing, and limits the electric core assembly in the housing to limit the movement of the electric core assembly in the housing. The position-limiting part 40 is connected to the main body 10 through the position-limiting protrusion 410, and it should be noted that the position-limiting part 40 may be connected to the main body 10 through other methods, for example, a mortise and tenon joint structure, a snap structure, a locking bolt device, and the like. The stopper 40 may be integrally formed with the main body 10. The present embodiment will be described in detail by taking an example in which the stopper 40 is connected to the main body 10 via the stopper boss 410.

The retaining boss 410 includes a first sidewall 413, a second sidewall 414, a third sidewall 415, and a fourth sidewall 416. The second and

third sidewalls

414 and 415 are symmetrically disposed at both ends of the first sidewall 413, and the fourth sidewall 416 is connected to the first, second, and

third sidewalls

413, 414, and 415, respectively. The second sidewall 414 and the first sidewall 413 are obliquely arranged at a certain angle, and the third sidewall 415 and the first sidewall 413 are obliquely arranged at a certain angle, so that the connection between the limiting portion 40 and the main body portion 10 is facilitated. It should be noted that the limiting boss 410 may be a trapezoid, a cylinder, a cuboid, a cube, or the like, or may be in any shape, and only needs to be adapted to the main body 10 to achieve connection.

In the first direction from the second sidewall 414 to the third sidewall 415, the limiting boss 410 has a third groove 411 disposed therethrough, the first portion 180 and the second portion 190 of the main body 10 are respectively provided with a second groove 230, and the direction from the groove bottom of the second groove 230 to the notch of the second groove 230 is opposite to the direction from the groove bottom of the first groove 110 to the notch of the first groove 110. It is understood that the second groove 230 may or may not be disposed therethrough. The third recess 411 communicates with the second recess 230.

In a second direction perpendicular to the first direction, the position restricting boss 410 is provided with a fourth groove 412, and an opening is formed on a fourth side wall 416. Wherein the third recess 411 is in communication with the fourth recess 412 and the fourth recess 412 is in communication with the first recess 110. Liquid can be formed to enter the first groove 110 from the bottom of the shell through the second groove 230, the third groove 411 and the fourth groove 412, and then enter a liquid channel of the bare cell infiltrated in the cell component.

With reference to fig. 5 to 7, fig. 5 is a schematic view of a first structure of a main body portion of a battery bottom support plate according to an embodiment of the present disclosure, fig. 6 is a schematic view of a second structure of the main body portion of the battery bottom support plate according to the embodiment of the present disclosure, and fig. 7 is a schematic view of a third structure of the main body portion of the battery bottom support plate according to the embodiment of the present disclosure. The main body 10 includes a first side 140 and a second side 150 opposite to each other, and a third side 160 and a fourth side 170 opposite to each other, wherein the first side 140, the third side 160, the second side 150, and the fourth side 170 are connected in sequence. The first groove 110 may be disposed along the first direction X from the first side 140 to the second side 150, and the first groove 110 forms a notch on at least one of the first side 140 and the second side 150. Or the first groove 110 is disposed along the third side 160 toward the second direction Y of the fourth side 170, and the first groove 110 is disposed on at least one of the third side 160 and the fourth side 170 to form a notch.

Wherein the first groove 110 may be at least one first groove segment 111 arranged along the first direction X. Specifically, the first groove 110 may be a plurality of first groove segments 111 disposed through from the first side edge 140 to the second side edge 150. The first groove 110 may also be formed by at least one first groove segment 111 forming a notch at the first side edge 140, and the other first groove segments 111 forming notches at the second side edge 150. It should be noted that, in the first direction X, the plurality of first groove segments 111 may be arranged in an array on the main body portion 10, or may be distributed arbitrarily, and the specific situation is set as required. First recess 110 can increase the area of contact of naked electric core bottom and electrolyte to be favorable to improving the infiltration effect of naked electric core bottom to electrolyte.

The first groove 110 may be at least one second groove 230 segment disposed along the second direction Y. Specifically, the first groove 110 may be a plurality of second groove segments 112 penetrating from the third side 160 to the fourth side 170, and a notch is formed on the fourth side 170. The first groove 110 may be formed by at least one second groove segment 112 notched at the third side 160 and the other second groove segments 112 notched at the fourth side 170. It should be noted that, in the second direction Y, the plurality of second groove segments 112 may be arranged in an array on the main body portion 10, or may be distributed arbitrarily, and the specific situation is set as required.

It is understood that the first recess 110 may be rectangular, square, triangular, trapezoidal, etc., and may be any shape. The specific shape, number and arrangement position of the first grooves 110 are not limited in the present application.

With reference to fig. 8 to 9, fig. 8 is a fourth structural schematic diagram of the main body portion of the battery bottom support plate according to the embodiment of the present disclosure, and fig. 9 is a fifth structural schematic diagram of the main body portion of the battery bottom support plate according to the embodiment of the present disclosure. The first groove 110 may also include at least one first groove segment 111 disposed along the first direction X and at least one second groove segment 112 disposed along the second direction Y, and the first groove segment 111 and the second groove segment 112 are communicated. It should be noted that the first groove 110 may be a first groove segment 111 disposed on the second portion 190, and a plurality of second groove segments 112 disposed on the first portion 180 and the third portion 210 of the main body 10. The first groove 110 may be a plurality of first groove segments 111 disposed on the second portion 190 and on the first portion 180, and the second groove segments 112 disposed on the third portion 210 of the body portion 10.

It should be noted that the distance between adjacent second groove segments 112 may be arbitrary, and the shape and size of each second groove segment 112 may be different. For example, when the distance between the opposing walls of the second groove 230 is relatively small, a capillary groove is formed, and as liquid enters the capillary groove, the liquid level is curved, a concave liquid level is formed, and there is a tendency to flatten. Therefore, pulling force can be generated on the liquid in the groove, the liquid is promoted to flow into the first groove section 111 from the second groove section 112, and the effect of soaking the bare cell by the liquid is increased.

Referring to fig. 10 to 12, fig. 10 is a sixth structural schematic view of the main body portion of the battery bottom support plate according to the embodiment of the present disclosure, fig. 11 is a seventh structural schematic view of the main body portion of the battery bottom support plate according to the embodiment of the present disclosure, and fig. 12 is an eighth structural schematic view of the main body portion of the battery bottom support plate according to the embodiment of the present disclosure. At least one of the first, second and

third portions

180, 190, 210 of the main body 10 has a first through hole 220 formed therein, and the first through hole 220 communicates with the first groove 110. For example, the plurality of first through holes 220 may be only disposed in the second portion 190, so that the liquid can be better introduced into the first groove 110, and the effect of wetting the bare cell with the liquid is improved.

When at least two first through holes 220 are respectively arranged at two ends of the second portion 190, the first through holes 220 can be used as the assembling and positioning features of the battery bottom supporting plate 1, so that the battery cell assembling efficiency is improved.

When the plurality of first through holes 220 are provided on the first portion 180 or the third portion 210 of the main body part 10, at least a part of the first through holes 220 is provided on the first portion 180, and another part of the first through holes 220 is provided on the second portion 190. The liquid can better flow into the first groove 110, and the effect of infiltrating the bare cell is increased.

The arrangement of the first through hole 220 can improve the heat dissipation capacity inside the battery and enhance the cycle performance of the battery. Effectively reducing the space occupancy rate and the weight of the bottom supporting plate.

It should be noted that the number of the first through holes 220 disposed on the first portion 180, the second portion 190 and the third portion 210 is not limited in this application, and it is understood that the positions of the first through holes 220 disposed on the first portion 180 and the third portion 210 may be symmetrically disposed with respect to the second portion 190 or asymmetrically disposed.

Referring to fig. 13 to 14, fig. 13 is a schematic view illustrating a first structure of a battery according to an embodiment of the present disclosure, and fig. 14 is a schematic view illustrating an exploded structure of the battery shown in fig. 13. The embodiment of the application also provides a battery 6, and the battery 6 comprises a shell 61, a battery core assembly 62 and a battery bottom supporting plate 1. Wherein the housing 61 has a receiving cavity, and the battery bottom bracket 1 is any one of the battery bottom brackets 1 in the above embodiments. Cell subassembly 62 sets up in holding the intracavity, and battery 6 layer board is located between cell subassembly 62 and casing 61, and spacing portion 40 on the battery bottom plate 1 carries on spacingly to cell subassembly 62, has restricted the removal of cell subassembly 62 in casing 61, has avoided the collision of cell subassembly 62 and casing 61.

Electric core subassembly 62 includes insulating part 63, and insulating part 63 has the chamber of holding, and electric core subassembly 62 sets up in insulating part 63's the intracavity that holds for avoid contact between naked electric core and the casing 61, influence the security performance of battery 6.

It should be noted that the bottom of the insulating part 63 is provided with at least one second through hole 630, and the second through hole 630 and the first groove 110 are staggered, so that the situation that foreign matters such as metal chips and burrs are in direct contact with a bare cell through the second through hole 630 and the first groove 110 can be avoided, and the probability of potential safety hazards is reduced. The separation ability of 1 bottom of battery bottom plate can be guaranteed, the electrolyte that can also make 1 bottom of battery bottom plate remain simultaneously is as few as possible, has avoided bottom electrolyte too much and has utilized not last problem.

The battery 6 further includes a battery top cover 64, and an explosion-proof valve 66, a positive electrode conductive unit 67, and a negative electrode conductive unit 68, which are provided on the battery top cover 64, and a pour hole unit 65. The liquid inlet unit 65 is used to introduce liquid into the case 61, and the liquid is accumulated in the bottom of the case 61 after entering. Liquid enters the first groove 110 through the second groove 230, the third groove 411, the fourth groove 412, the first through hole 220 and the like, and through the connection of the first groove 110 and the second through hole 630, the liquid can infiltrate the bare cell through the second through hole 630, so that the contact area is increased, and the infiltration effect is also increased.

Referring to fig. 15 to 17, fig. 15 is a second structural schematic diagram of a battery according to an embodiment of the present disclosure, fig. 16 is a schematic cross-sectional view of the battery shown in fig. 15 along a direction B-B, and fig. 17 is a partial enlarged view of a portion C of the battery shown in fig. 16. Spacing portion 40 of battery bottom bracket board 1 establishes between electric core subassembly 62 and casing 61, and is spacing to electric core subassembly 62 in casing 61, has avoided bumping between electric core subassembly 62 and the casing 61, leads to the damaged condition of naked electric core, has improved electric core subassembly 62's resistant vibration performance. The specific details of the limiting portion 40 are described above, and are not described in detail here.

The battery bottom supporting plate and the battery provided by the embodiment of the application are described in detail above. The principles and implementations of the present application are described herein using specific examples, which are presented only to aid in understanding the present application. Meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

1. A battery bottom pallet, comprising:

2. The battery bottom tray of claim 1,

at least two limiting grooves are formed in the side edge of the main body, and each limiting portion is matched with one limiting groove, so that the limiting portions are connected with the main body in a clamping mode.

3. The battery bottom tray of claim 1, wherein the main body portion comprises a first side and a second side that are disposed opposite to each other, and a third side and a fourth side that are disposed opposite to each other, and the first side, the third side, the second side, and the fourth side are connected in sequence;

4. The battery bottom bracket plate of claim 3, wherein the limiting portion comprises a limiting boss and an extending portion, and the extending portion and the limiting boss are fixedly connected in a direction perpendicular to the first direction.

5. The battery bottom plate of claim 4, wherein in the first direction, the main body portion is provided with a second groove, the limiting boss is provided with a third groove therethrough, the third groove communicates with the second groove, and in a second direction from the third side to the fourth side, the limiting boss is provided with a fourth groove, the third groove communicates with the fourth groove and the fourth groove communicates with the first groove, such that liquid flows into the first groove through the second groove, the third groove, and the fourth groove.

6. The battery bottom tray of claim 3, wherein the first groove comprises at least one first groove segment and at least one second groove segment;

the first groove section is arranged along the first direction;

7. The battery bottom bracket plate of claim 1, wherein the main body portion and the restraining portion are integrally formed.

8. The battery bottom bracket plate of any of claims 1-7, wherein the body portion comprises a first portion, a second portion, and a third portion connected in series, the first recess being formed in the second portion;

9. A battery, comprising:

a housing having a receiving cavity;

the electric core assembly is arranged in the accommodating cavity; and

the battery bottom supporting plate according to any one of claims 1 to 8, which is arranged between the electric core assembly and the shell, so that the limit part of the battery bottom supporting plate limits the electric core assembly.

10. The battery of claim 9, wherein the bottom of the cell assembly is provided with at least one second through hole, the second through hole is staggered with the first groove, and the liquid in the first groove can enter the cell assembly through the second through hole.