CN219498102U - Battery module and electric equipment - Google Patents

Abstract

A battery module and electric equipment, the battery module includes the body, electric core and flexible circuit board; the battery cell is accommodated in the shell; the flexible circuit board comprises a body, a connecting sheet and a clamping sheet; the connecting sheet is electrically connected with the body and the anode of the battery cell; the clamping piece is electrically connected with the body and the shell; wherein, the clamping piece is clamped and fixed with the shell and is self-locking through generating elastic deformation when being installed. According to the battery module provided by the utility model, the flexible circuit board is arranged, the clamping piece is clamped and fixed with the shell through elastic deformation and is self-locking, the clamping piece can realize the positioning and pressing functions, a fixture is not required, the alignment and pressing are simple, the tolerance accumulation problem is avoided, the manufacturing cost is reduced, and the production efficiency is improved.

Description

Battery module and electric equipment

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery module and electric equipment.

Background

In power cell systems, the explosion protection valve of lithium cells is typically made of very thin aluminum materials. When the voltage of the shell is lower than 0.2-0.3V, if the electrolyte infiltrates into the explosion-proof valve, aluminum of the explosion-proof valve can undergo side reaction with lithium ions in the electrolyte, so that the risk of liquid leakage is generated. Therefore, if the electrolyte wets the explosion-proof valve, it is necessary to raise the voltage of the case. In the cell design, the positive electrode lug and the negative electrode lug are led out through the positive electrode post and the negative electrode post, and the positive electrode post, the negative electrode post and the shell are separated by an insulating piece, so that the shell is insulated from the cell.

At present, the scheme of charging the shell is mainly to electrically connect the anode of the battery cell with the shell, connect a plurality of metal sheets through a flexible circuit board, and weld the metal sheets with the shells of a plurality of battery cells.

However, the welding has higher requirements on the assembly process, the tooling is required to position and compress the metal sheets, when the number of the batteries is more and the flexible circuit board is longer, the alignment and compression become more difficult due to tolerance accumulation, the tooling has higher requirements, the manufacturing cost is increased, and the production efficiency is low.

Disclosure of Invention

The utility model aims to provide a battery module and electric equipment, which solve the problems of high manufacturing cost and low production efficiency caused by difficult alignment and compaction generated by positioning and compacting a metal sheet by using a tool.

In order to achieve the purpose of the utility model, the utility model provides the following technical scheme:

in a first aspect, the present utility model provides a battery module comprising: a housing; the battery cell is accommodated in the shell; the flexible circuit board comprises a body, a connecting sheet and a clamping sheet; the connecting sheet is electrically connected with the body and is electrically connected with the anode of the battery cell; the clamping piece is electrically connected with the body and the shell; the clamping piece is clamped with the shell through elastic deformation and is self-locked.

In one embodiment, the clamping piece comprises a main body part, a clamping part and an extending part, wherein the clamping part and the extending part are connected with the main body part, the extending part is connected with the main body, the clamping part is in a bending shape, and the clamping part is used for generating elastic deformation to clamp the shell.

In one embodiment, the number of the clamping portions is plural, one end of the plurality of clamping portions is connected with the edge of the main body portion, and the plurality of clamping portions are located on the same side of the main body portion.

In one embodiment, the plurality of clamping portions are arranged in an annular array at the center of the main body portion.

In one embodiment, the clamping portion comprises a connecting section, a clamping section and a guiding section which are sequentially connected, one end of the connecting section, which is opposite to the clamping section, is fixedly connected with the main body portion, the connecting section and the main body portion are provided with a first included angle, the clamping section extends towards the middle of the main body portion, a second included angle is formed between the connecting section and the clamping section, the guiding section extends towards one side, which is opposite to one side of the main body portion and is far away from the middle of the main body portion, and a third included angle is formed between the guiding section and the clamping section; the first included angle and the second included angle are smaller than or equal to 90 degrees, and the third included angle is smaller than 90 degrees.

In one embodiment, the guide section is curved, and two opposite ends of the middle of the guide section protrude toward one side of the middle of the main body.

In one embodiment, the shell is provided with a boss, a clamping groove is formed in the side face of the boss, and the clamping section stretches into the clamping groove and is clamped with the inner wall of the clamping groove; the clamping piece is electrically connected with the shell through the boss.

In one embodiment, the inner wall of the clamping groove comprises a first wall surface, the surface of the clamping section facing the main body part is a first surface, the first wall surface is in contact with the first surface, a fourth included angle is formed between the first wall surface and the side surface of the boss, and the fourth included angle is smaller than or equal to 90 degrees.

In one embodiment, the surface of the main body facing the boss is a second surface, a distance between the first surface and the second surface is a first distance, the boss further comprises a top surface far away from the housing, a distance between the top surface and the first wall surface is a second distance, and the first distance is smaller than or equal to the second distance.

In one embodiment, the battery module further comprises a conductive adhesive layer, and the conductive adhesive layer is connected with the top surface of the boss and the main body.

In a second aspect, the present application further provides an electric device, including the battery module set according to any one of the various embodiments of the first aspect.

According to the battery module provided by the utility model, the flexible circuit board is arranged, the clamping piece is clamped and fixed with the shell through elastic deformation and is self-locking, the clamping piece can realize the positioning and pressing functions, a fixture is not required, the alignment and pressing are simple, the tolerance accumulation problem is avoided, the manufacturing cost is reduced, and the production efficiency is improved.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the utility model, and that other drawings can be obtained from them without inventive effort for a person skilled in the art.

Fig. 1 is a schematic view of a battery module according to an embodiment;

fig. 2 is a perspective view of a single battery of the battery module of an embodiment;

fig. 3 is a perspective view of a battery module according to an embodiment;

FIG. 4 is an enlarged view of a portion of FIG. 3 at A;

FIG. 5 is a top view of a clip and boss of one embodiment;

FIG. 6 is a cross-sectional view taken in the direction B-B of FIG. 5;

FIG. 7 is an exploded view of the clip and boss of FIG. 6;

fig. 8 is an exploded view of a clip, boss and conductive adhesive layer of one embodiment.

Reference numerals illustrate:

11-a shell, 111-a first insulating part, 112-a second insulating part, 12-a battery cell, 121-a positive electrode, 122-a negative electrode, 13-a boss, 131-a clamping groove, 132-a first wall surface, 133-a top surface and 14-a resistor;

20-flexible circuit board, 21-body, 22-connection piece, 23-clamping piece, 231-main part, 232-clamping part, 233-extension, 234-connection section, 235-clamping section, 236-guiding section, 237-first surface, 238-second surface, 24-conductive adhesive layer.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, are intended to fall within the scope of the present utility model.

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 intervening elements may also be present. When a component is considered to be "connected" to another component, it can be directly connected to the other component or intervening components may also be present.

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 utility model belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

Some embodiments of the present utility model are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.

Referring to fig. 1, an embodiment of the utility model provides a battery module, which includes a housing 11 and a battery cell 12.

The housing 11 may be an aluminum housing, and the shape of the housing 11 may be square or circular, without limitation.

The battery cell 12 includes, but is not particularly limited to, a positive electrode 121 sheet (not shown), a negative electrode 122 sheet (not shown), and a separator (not shown) provided between the positive electrode 121 sheet and the negative electrode 122 sheet. The battery cell 12 is accommodated in the case 11, and the battery cell 12 has a positive electrode 121 and a negative electrode 122, specifically, the positive electrode 121 includes a positive electrode tab (not shown) led out from the battery cell 12, a positive electrode post (not shown) connected to the positive electrode tab, and the like, and the negative electrode 122 generally includes a negative electrode tab (not shown) led out from the battery cell 12, a negative electrode post (not shown) connected to the negative electrode tab, and the like. The positive electrode 121 and the negative electrode 122 may be disposed on the same end cap assembly, or may be disposed on different end cap assemblies, and the end cap assemblies generally include structures such as aluminum flakes, explosion-proof valves, and the like, which are not particularly limited.

For example, as shown in fig. 1, one of the end cap assemblies may be provided with a first insulating member 111, and the positive electrode post of the positive electrode 121 is inserted through the first insulating member 111, and the first insulating member 111 separates the positive electrode post from the aluminum sheet to realize insulation. The end cover assembly at the other end can be provided with a second insulating piece 112, a negative pole column of the negative pole 122 penetrates through the second insulating piece 112, and the second insulating piece 112 separates the negative pole column from the aluminum sheet to realize insulation. The positive pole post and the negative pole post are exposed to the outside and are used for being electrically connected with an external charger or an electrical appliance. The first insulating member 111 and the second insulating member 112 may be, for example, a ceramic ring, a plastic ring, or the like, without limitation.

In order to solve the problem that the electrolyte infiltrates into the aluminum material of the explosion-proof valve to cause a risk of leakage of the liquid, as shown in fig. 1, the positive electrode 121 is electrically connected to the case 11 to positively charge the case 11. The positive electrode 121 may be electrically connected to the case 11 using any means such as a wire, a flexible circuit board 20, etc., and the resistive member 14 may be connected in series on the connection path to control the voltage of the case 11. Alternatively, referring to fig. 1 and 2, a boss 13 may be disposed on the housing 11, the positive electrode 121 is electrically connected to the boss 13, and the boss 13 transmits the voltage to the housing 11.

In one embodiment of the present utility model, referring to fig. 3 and 4, the positive electrode 121 of the battery cell 12 and the housing 11 are electrically connected using the flexible circuit board 20. Specifically, the flexible circuit board 20 includes a body 21, a connecting piece 22, and a clamping piece 23; the connecting piece 22 is electrically connected with the body 21 and is electrically connected with the positive electrode 121 of the battery cell 12; the engaging piece 23 is electrically connected to the body 21 and to the housing 11.

One end of the connecting piece 22 is electrically connected with the wiring on the body 21 by binding welding or the like, and the other end is electrically connected with the positive electrode 121. The connection between the connection piece 22 and the positive electrode 121 may be specifically realized by connecting the connection piece 22 to a positive electrode tab or a positive electrode post. As shown in fig. 4, the connecting piece 22 is connected with a metal cover covered on the positive pole of the end cover assembly, and the specific connection mode can be clamping connection, welding connection and the like. The connection piece 22 is electrically connected to the battery 12 through the metal cap, the positive electrode post, the connection piece connecting the positive electrode post and the positive electrode tab, and the positive electrode tab in this order. The structures of the end cover assembly, the positive pole post, the switching piece, the positive pole lug and the like can refer to the related content in the prior art, and the embodiment of the utility model is not limited. The material, size, etc. of the connection piece 22 are not limited.

One end of the clamping piece 23 and the wiring on the body 21 can be electrically connected by binding welding and the like, and the other end is electrically connected with the shell 11. The engagement piece 23 is electrically connected to the housing 11 by engagement. The clamping piece 23 can be directly clamped and fixed with the shell 11, or can be clamped and fixed by other intermediate members arranged on the shell 11, and the intermediate members can be a boss 13 or other structures, and are not limited. The engaging piece 23 is electrically connected to the housing 11 through the intermediate member. The locking piece 23 is locked and self-locked with the housing 11 by elastic deformation during installation. In other words, when the clamping piece 23 is mounted, the clamping piece 23 contacts with the shell 11 or the middle member first, when pressure is applied to the clamping piece 23, the clamping piece 23 generates elastic deformation, and when the clamping piece 23 is in place, the clamping piece 23 returns to the original state, and can not be separated from the shell 11 or the middle member under the action of small pulling force due to the structural design of the clamping piece 23, namely, the self-locking of the clamping piece 23 is realized. The clamping piece 23 can be nickel or other metal conductive materials, has certain elasticity and strength, and can rebound and reset by itself after being slightly bent and stressed. The thickness of the clip 23 may be approximately the same throughout the thickness, and may be 0.15mm-0.3mm, the thickness not being too thick, otherwise the elasticity being insufficient, the thickness not being too thin, otherwise the strength being insufficient.

The connecting piece 22 is electrically connected with the clamping piece 23 through a wiring on the body 21, and the body 21 can be provided with a required resistor 14 to meet the adjustment of the voltage of the shell 11.

Compared with the existing scheme of positioning and compacting the metal sheet by adopting the tool, the battery module provided by the embodiment of the utility model has the advantages that the flexible circuit board 20 is arranged, the clamping piece 23 is clamped and fixed with the shell 11 through elastic deformation and is self-locked, the clamping piece 23 realizes the positioning and compacting functions, the tool is not required, the alignment and compacting are simple, the tolerance accumulation problem is avoided, the manufacturing cost is reduced, and the production efficiency is improved.

Alternatively, referring to fig. 5 to 7, the clamping piece 23 includes a main body 231, a clamping portion 232 and an extending portion 233, wherein the clamping portion 232 and the extending portion 233 are connected to the main body 231, the extending portion 233 is connected to the main body 21, the clamping portion 232 is curved, and the clamping portion 232 is used for elastically deforming to clamp the housing 11.

The body 231 may have a substantially flat plate shape, the engagement portion 232 may protrude from one side of the body 231, and the extension portion 233 may be connected to one side edge of the body 231 and may protrude from the body 231. Alternatively, the clamping portion 232 and the extending portion 233 respectively protrude from two opposite side surfaces of the main body 231. The main body 231, the clamping portion 232 and the extending portion 233 can be in smooth transition connection, so that stress concentration portions are avoided, and the risk of easy breakage is reduced. The main body 231, the clamping portion 232, and the extension portion 233 may be integrally formed to enhance structural strength.

The engaging portion 232 is curved, and the specific shape thereof is not limited. The specific manner in which the engagement portion 232 is engaged with the housing 11 is not limited, and any structure and manner that can achieve engagement may be used.

By providing the clip piece 23 including the main body portion 231, the clip portion 232, and the extension portion 233, the structure is simple, the cost is low, and connection with the body 21 of the flexible circuit board 20 and the housing 11 is easily achieved.

Alternatively, referring to fig. 6 to 8, the number of the clamping portions 232 is plural, one end of each of the clamping portions 232 is connected to the edge of the main body 231, and the clamping portions 232 are located on the same side of the main body 231.

The plurality of clamping portions 232 are uniformly distributed at the peripheral edges of the main body portion 231, and the plurality of clamping portions 232 and the main body portion 231 jointly enclose a space to be clamped so as to be clamped with the shell 11. Specifically, fig. 6 to 8 show that the number of the catching portions 232 is 2, and 2 catching portions 232 are provided at opposite side edges of the main body portion 231. Of course, the number of the clamping portions 232 may be other numbers, which is not limited.

Alternatively, the plurality of clamping portions 232 are arranged in an annular array at the center of the main body 231. In other words, on one hand, the shapes and structures of the plurality of clamping portions 232 are the same, on the other hand, the plurality of clamping portions 232 are arranged in an annular array mode, the enclosed space to be clamped is regular, and the clamping stability can be improved.

Alternatively, the number of the clamping portions 232 may be 1, and may be disposed at the middle, edge, etc. of the main body 231, without limitation. Alternatively, the plurality of engaging portions 232 may be disposed on the main body 231 in other arrangements, which is not limited.

Optionally, referring to fig. 7, the clamping portion 232 includes a connecting section 234, a clamping section 235, and a guiding section 236 that are sequentially connected. One end of the connecting section 234, which is opposite to the clamping section 235, is fixedly connected with the main body 231, the connecting section 234 and the main body 231 have a first included angle alpha, the clamping section 235 extends towards the middle of the main body 231, a second included angle beta is formed between the connecting section 234 and the clamping section 235, the guiding section 236 extends towards one side opposite to the main body 231 and away from the middle of the main body 231, and a third included angle gamma is formed between the guiding section 236 and the clamping section 235. The first included angle alpha and the second included angle beta are smaller than or equal to 90 degrees, and the third included angle gamma is smaller than 90 degrees.

The connecting section 234 and the main body 231 are in smooth transition connection, the holding section 235 and the connecting section 234 are in smooth transition connection, and the guiding section 236 and the holding section 235 are in smooth transition connection. The connecting section 234 may be substantially flat, and the first included angle α is an included angle between a flat plate of the main body 231 and a flat plate of the connecting section 234. The holding section 235 may also be substantially plate-shaped, and the second angle β is an angle between the plate of the holding section 235 and the plate of the connecting section 234. The guide section 236 may be a flat plate or a curved plate, and when the guide section 236 is a flat plate, the third included angle γ is an included angle between the flat plate of the guide section 236 and the flat plate of the holding section 235; when the guide section 236 is a curved plate, the third included angle γ is an included angle between a connecting line between one end of the guide section 236 connected with the holding section 235 and the opposite end and a flat plate of the holding section 235.

The first included angle α and the second included angle β are smaller than or equal to 90 ° so that the holding section 235 is parallel to the main body 231, or one end of the holding section 235 away from the connecting section 234 is tilted upward toward the main body 231, so that the opening of the space enclosed by the main body 231, the connecting section 234 and the holding section 235 is not larger than the size of the internal space, and when the holding is performed, the housing 11 is accommodated in the space enclosed by the main body 231, the connecting section 234 and the holding section 235, thereby the holding section 235 can be stably held with the housing 11.

The third included angle gamma is smaller than 90 degrees, so that the guide section 236 is outwards turned over relative to the clamping section 235, when the clamping piece 23 is installed, the outwards turned guide section 236 is firstly contacted with the shell 11, the clamping piece 23 moves towards the shell 11, the shell 11 and the guide section 236 relatively slide, the shell 11 extrudes the guide section 236 and the clamping section 235 to elastically deform outwards, and after the guide section 236 and the clamping section 235 return in place, the clamping connection is realized. Because the first included angle α and the second included angle β are smaller than or equal to 90 °, the clamped clamping section 235 cannot easily withdraw from the housing 11.

The specific included angle between the first included angle α and the second included angle β may be 60 ° -90 °, for example 60 °, 70 °, 80 °,90 °, etc., without limitation. The third angle γ may be 45 ° -80 °, for example 45 °, 60 °, 70 °, 80 °, etc., without limitation.

Alternatively, referring to fig. 6 and 7, the guide section 236 is curved, and opposite ends of the middle portion of the guide section 236 protrude toward one side of the middle portion of the body portion 231. In this way, when the guide section 236 is just in contact with the housing 11, the guide section 236 is turned out a distance away from the end of the holding section 235, so that better alignment is possible. In other words, taking the two clamping portions 232 of fig. 6 and 7 as an example, the middle portions of the guiding sections 236 of the two clamping portions 232 are protruded towards one another at opposite ends, so that the end of the two guiding sections 236 away from the corresponding clamping section 235 has a larger opening, which can be aligned with the corresponding mounting position of the housing 11 more easily, and can finish the mounting more quickly.

The aforementioned engaging piece 23 may be engaged with the housing 11 directly, or may be engaged with an intermediate structure provided on the housing 11, and a specific embodiment is provided below.

Referring to fig. 3 and 4, and referring to fig. 5 to 8, the housing 11 is provided with a boss 13, a clamping groove 131 is formed on a side surface of the boss 13, and a clamping section 235 extends into the clamping groove 131 and is clamped with an inner wall of the clamping groove 131; the engaging piece 23 is electrically connected to the housing 11 through the boss 13.

The boss 13 is used as an intermediate structure, and the boss 13 can be directly connected and fixed with the shell 11; other structures may also be provided between boss 13 and housing 11, for example, boss 13 is provided on an aluminum tab of the end cap assembly that is connected to housing 11, i.e., the intermediate structure includes boss 13 and an aluminum tab. The shape of the boss 13 is not limited, and as shown in fig. 8, the boss 13 may be substantially in a truncated cone shape, and the shape of the corresponding main body 231 and the plurality of engaging portions 232 may be matched with the shape of the boss 13 to achieve engagement with the boss 13. The boss 13 may be provided in a shape in which the size of the boss 13 gradually decreases from the bottom to the top, and the peripheral edge of the top of the boss 13 may be provided with a chamfer or rounded corner to facilitate installation with the clamping portion 232.

Through setting up boss 13, the draw-in groove 131 is opened to the side of boss 13 to be convenient for cooperate with the card section 235 of holding of card tab 23, the card section 235 stretches into draw-in groove 131 and holds with the inner wall card of draw-in groove 131, thereby realizes the card of card tab 23 and boss 13 and holds, and card tab 23 remains contact with boss 13 all the time, makes between card tab 23 and boss 13 and the casing 11 keep electric connection, thereby can make casing 11 electrified.

Alternatively, referring to fig. 7, the inner wall of the clamping groove 131 includes a first wall surface 132, and a surface of the clamping section 235 facing the main body 231 is a first surface 237. When the holding section 235 is held by the inner wall of the slot 131, the first wall 132 contacts the first surface 237. A fourth included angle delta is formed between the first wall surface 132 and the side surface of the boss 13, and the fourth included angle delta is smaller than or equal to 90 degrees.

The fourth included angle δ may be the included angle between the tangent line of the side surface of the boss 13 and the tangent line of the inner wall of the clamping groove 131 (i.e. the first wall surface 132) in the two tangent lines where the side surface of the boss 13 meets. The fourth included angle δ is less than or equal to 90 °, so that when the holding section 235 contacts the first wall 132, the holding section 235 is far away from the connecting section 234 and parallel to the main body 231, or one end of the connecting section 234 far away from the connecting section 234 is tilted towards the main body 231, so that the holding is more stable. The fourth angle δ may be, but not limited to, 60 ° -90 °, for example, 60 °, 70 °, 80 °,90 °, etc.

Optionally, referring to fig. 7, a surface of the main body 231 facing the boss 13 is a second surface 238, a distance between the first surface 237 and the second surface 238 is a first distance C, the boss 13 further includes a top surface 133 remote from the housing 11, a distance between the top surface 133 and the first wall 132 is a second distance D, and the first distance C is less than or equal to the second distance D. So set up for joint portion 232 and boss 13 joint time, joint portion 232 warp the atress, and its resilience force is used in the first wall 132 of draw-in groove 131, makes main part 231 and boss 13's top surface 133 also be contact, thereby can make the more steady of joint, can not rock, and the reliability of electricity connection is also better.

After the clamping piece 23 is clamped with the boss 13, the welding can be performed subsequently, and the clamping piece 23 is welded with the boss 13, so that stable connection is realized.

In one embodiment, referring to fig. 8, the battery module further includes a conductive adhesive layer 24, where the conductive adhesive layer 24 connects the top surface 133 of the boss 13 and the main body 231. The conductive adhesive layer 24 may be specifically conductive silica gel or other conductive adhesive, and is used for realizing electrical connection between the boss 13 and the main body 231, meanwhile, the conductive adhesive layer 24 fills a gap between the boss 13 and the main body 231, keeps good interface contact, reduces contact resistance, and further makes connection between the clamping piece 23 and the boss 13 more stable. In this embodiment, the subsequent welding reinforcement is unnecessary, so that the welding procedure can be saved, the undesirable risks of cracks, air holes, cold joint and the like accompanying welding are avoided, the cost is reduced, and the production efficiency is improved.

The embodiment of the application also provides electric equipment, which comprises the battery module in any embodiment. The electric equipment can be an electric automobile, energy storage equipment, any other equipment using electric energy and the like, and is not limited.

In the description of the embodiments of the present utility model, it should be noted that, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like refer to the orientation or positional relationship described based on the drawings, which are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

The above disclosure is only a preferred embodiment of the present utility model, and it should be understood that the scope of the utility model is not limited thereto, but all or part of the procedures for implementing the above embodiments can be modified by one skilled in the art according to the scope of the appended claims.

Claims (11)

1. A battery module, comprising:

a housing;

the battery cell is accommodated in the shell;

the flexible circuit board comprises a body, a connecting sheet and a clamping sheet;

the connecting sheet is electrically connected with the body and is electrically connected with the anode of the battery cell;

the clamping piece is electrically connected with the body and the shell;

the clamping piece is clamped with the shell through elastic deformation and is self-locked.

2. The battery module according to claim 1, wherein the engaging piece includes a main body portion, an engaging portion and an extending portion, the engaging portion and the extending portion are connected to the main body portion, the extending portion is connected to the main body portion, the engaging portion is curved, and the engaging portion is configured to be elastically deformed to engage the case.

3. The battery module according to claim 2, wherein the number of the clamping portions is plural, one ends of the plurality of clamping portions are connected with the edge of the main body portion, and the plurality of clamping portions are located on the same side of the main body portion.

4. The battery module according to claim 3, wherein the plurality of clamping portions are arranged in an annular array with a center of the main body portion.

5. The battery module according to claim 4, wherein the clamping portion comprises a connecting section, a clamping section and a guiding section which are sequentially connected, one end of the connecting section, which is opposite to the clamping section, is fixedly connected with the main body portion, the connecting section and the main body portion have a first included angle, the clamping section extends towards the middle of the main body portion, a second included angle is formed between the connecting section and the clamping section, the guiding section extends towards one side, which is opposite to one side of the main body portion and is far away from the middle of the main body portion, and a third included angle is formed between the guiding section and the clamping section; the first included angle and the second included angle are smaller than or equal to 90 degrees, and the third included angle is smaller than 90 degrees.

6. The battery module according to claim 5, wherein the guide section is curved, and opposite ends of the middle portion of the guide section protrude toward one side of the middle portion of the main body portion.

7. The battery module according to claim 5, wherein the housing is provided with a boss, a clamping groove is formed in a side surface of the boss, and the clamping section extends into the clamping groove and is clamped with an inner wall of the clamping groove; the clamping piece is electrically connected with the shell through the boss.

8. The battery module of claim 7, wherein the inner wall of the clamping groove comprises a first wall surface, the surface of the clamping section facing the main body part is a first surface, the first wall surface is in contact with the first surface, a fourth included angle is formed between the first wall surface and the side surface of the boss, and the fourth included angle is smaller than or equal to 90 °.

9. The battery module of claim 8, wherein a surface of the body portion facing the boss is a second surface, a distance between the first surface and the second surface is a first distance, the boss further comprises a top surface remote from the housing, a distance between the top surface and the first wall surface is a second distance, and the first distance is less than or equal to the second distance.

10. The battery module according to any one of claims 7 to 9, further comprising a conductive adhesive layer connecting the top surface of the boss and the main body portion.

11. A powered device comprising a battery module according to any one of claims 1 to 10.