CN210744061U - Battery module, battery pack and device - Google Patents

Abstract

The present application relates to a battery module, a battery pack and a device, the battery module including: a battery cell including an electrode lead; an electrical connection member connecting electrode leads of the battery cells; the electrode lead comprises a first body part and a first extension part, wherein the first body part protrudes relative to the first extension part along the height direction of the battery module; the electric connection component comprises a second body part and a second extension part, and the second body part protrudes relative to the second extension part along the height direction; the first body part is connected with the second body part, and the first extension part is connected with the second extension part. When the electrode lead is connected with the electric connection part, at least two connection surfaces are correspondingly connected, so that the connection area between the two is large, the connection reliability between the two is improved, meanwhile, the flow area of the two after connection can be increased, the risk of heating of the connection position of the electrode lead and the electric connection part in the working process of the battery module is reduced, and the safety and the service life of the battery module are improved.

Description

Battery module, battery pack and device

Technical Field

The application relates to the technical field of energy storage devices, in particular to a battery module, a battery pack and a device.

Background

The battery module comprises a plurality of battery monomers, each battery monomer comprises an electrode lead, and the electrode leads of the battery monomers are connected through an electric connection component, so that grouping of the battery monomers in the battery module is realized. At present, an electrode lead is of a columnar structure, an electric connecting part is of a sheet structure, when the electric connecting part is connected with the electrode lead, the connecting area of the electric connecting part and the electrode lead is small, the connecting reliability is low, the flow area between the electric connecting part and the electrode lead is small, and the heating value of the joint of the electric connecting part and the electrode lead is high.

SUMMERY OF THE UTILITY MODEL

The present application provides a battery module, a battery pack, and a device, in which the connection area between an electrical connection member and an electrode lead of the battery module is large, and the connection reliability and the flow area are large.

A first aspect of embodiments of the present application provides a battery module, including:

a battery cell including an electrode lead;

an electrical connection member connected to the electrode leads of the battery cells;

wherein the electrode lead includes a first body part and a first extension part, the first body part protruding with respect to the first extension part in a height direction of the battery module;

the electric connection component comprises a second body part and a second extension part, and the second body part protrudes relative to the second extension part along the height direction;

the first body portion is connected to the second body portion, and the first extension portion is connected to the second extension portion.

In one possible design, the second extension portion is provided with a limit portion, the first extension portion is provided with a matching portion, and the limit portion is connected with the matching portion.

In one possible design, the limiting part is provided with a limiting hole and an upper end surface;

the matching part protrudes out of the first extension part and comprises a first section and a second section;

the first section is connected with the first extension part, and the size of the first section is smaller than that of the second section, so that a step surface is formed between the first section and the second section;

the first section is matched with the limiting hole, the second section extends out of the limiting hole, and the step surface is abutted to the upper end face.

In a possible design, the second extending portion is provided with a through hole;

the limiting part comprises a plurality of clamping jaws which are arranged along the circumferential direction of the through hole, and the plurality of clamping jaws enclose the limiting hole;

in the height direction, the jaws have first end portions and second end portions, the second end portions are connected with the second extending portions, and the first end portions of the jaws form the upper end face.

In one possible design, each of the jaws is spaced apart.

In one possible design, the jaws approach each other in a direction from the second end towards the first end.

In one possible design, the limiting part is in interference fit with each clamping jaw.

In one possible design, the outer contour of the second section is curved.

In one possible design, the cross-sectional area of the first body portion decreases gradually in a direction away from the first extension portion;

the electrical connection component further includes a transition portion connected between the second body portion and the second extension portion;

the transition part is obliquely arranged.

In a possible design, the first body portion is provided with a groove, and the second body portion is provided with a protrusion;

the sectional area of the protrusion is gradually reduced in a direction toward the electrode lead, and the sectional area of the groove is gradually increased in a direction away from the electrical connection member;

the protrusion is in interference fit with the groove.

A second aspect of the embodiments of the present application provides a battery pack, including:

a case having a receiving cavity;

a battery module, which is the above battery module;

wherein the battery module is accommodated in the accommodating cavity.

A third aspect of the embodiments of the present application provides an apparatus using a battery cell as a power source, the apparatus including:

a power source for providing a driving force to the device; and the combination of (a) and (b),

a battery module as described above, or a battery pack as described above, configured to provide electrical energy to the power source.

In the embodiment of the application, free electrode lead of battery includes two at least connection faces, and likewise, electric connecting part also includes two at least connection faces, and when the two was connected, two at least connection faces corresponded the connection for area of connection between the two is great, thereby improves the connection reliability between the two, and simultaneously, can also increase the two area of overflowing after connecting, reduce the risk that electrode lead and electric connection portion hookup location generate heat in the battery module course of operation, improve battery module's security and life.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

FIG. 1 is a schematic diagram of an apparatus provided in an embodiment of the present application;

fig. 2 is a schematic structural view of the battery pack of fig. 1;

FIG. 3 is a schematic diagram of the battery module of FIG. 2 in one embodiment;

FIG. 4 is an exploded view of FIG. 3;

FIG. 5 is an enlarged view of a portion I of FIG. 4;

FIG. 6 is a schematic structural view of the electrical connection component of FIG. 4;

FIG. 7 is an enlarged view of a portion II of FIG. 6;

FIG. 8 is a cross-sectional view of FIG. 6;

fig. 9 is a cross-sectional view of the battery cell of fig. 4;

FIG. 10 is an enlarged view of a portion III of FIG. 9;

fig. 11 is a sectional view illustrating the electrode lead of fig. 10 being coupled with an electrical connection member.

Reference numerals:

d-means;

an M-cell group;

m1-case;

m11-upper box body;

m12-lower box;

m13-containing cavity;

m2-battery module;

1-a battery cell;

11-electrode lead;

111-a first body portion;

111 a-inclined wall;

112-a first extension;

113-a groove;

114-a mating portion;

114 a-first segment;

114 b-a second segment;

114 c-step face;

2-an electrical connection member;

21-a second body portion;

22-a second extension;

221-a through hole;

23-a transition;

24-a limiting part;

241-jaw;

241 a-a first end portion;

241 b-a second end;

242-limiting holes;

243-upper end face;

25-projection;

3-an end plate;

4-side plate.

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.

Detailed Description

For better understanding of the technical solutions of the present application, the following detailed descriptions of the embodiments of the present application are provided with reference to the accompanying drawings.

It should 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 terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

It should be noted that the terms "upper", "lower", "left", "right", and the like used in the embodiments of the present application are described in terms of the angles shown in the drawings, and should not be construed as limiting the embodiments of the present application. In addition, in this context, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on "or" under "the other element or be indirectly on" or "under" the other element via an intermediate element.

The embodiment of the application provides a device D using a battery cell 1 as a power source, a battery pack M and a battery module M2, wherein the device D using the battery cell 1 as the power source comprises a vehicle, a ship, a small airplane and other mobile equipment, the device D comprises a power source for providing driving force for the device D, and the power source can be configured as the battery module M2 for providing electric energy for the device D. The driving force of the device D may be electric energy, or may include electric energy and other energy sources (e.g., mechanical energy), the power source may be the battery module M2 (or the battery pack M), and the power source may also be the battery module M2 (or the battery pack M) and the engine, etc. Therefore, a device D that can use the battery cell 1 as a power source is within the scope of the present application.

As shown in fig. 1, taking a vehicle as an example, the device D in the embodiment of the present application may be a new energy vehicle, which may be a pure electric vehicle, a hybrid electric vehicle, or an extended range vehicle. The vehicle can comprise a battery pack M and a vehicle main body, wherein the battery pack M is arranged on the vehicle main body, the vehicle main body is also provided with a driving motor, the driving motor is electrically connected with the battery pack M, the battery pack M provides electric energy, and the driving motor is connected with wheels on the vehicle main body through a transmission mechanism so as to drive the vehicle to move. Specifically, the battery pack M may be horizontally disposed at the bottom of the vehicle body.

As shown in fig. 2, the battery pack M includes a box M1 and a battery module M2 according to the embodiment of the present disclosure, wherein the box M1 has a receiving cavity M13, the battery module M2 is received in the receiving cavity M13, the number of the battery modules M2 may be one or more, and a plurality of battery modules M2 are arranged in the receiving cavity M13. The type of the case M1 is not limited, and may be a frame-like case, a disc-like case, a box-like case, or the like. Specifically, as shown in fig. 2, the case M1 may include a lower case M12 accommodating the battery module M2 and an upper case M11 covering the lower case M12.

More specifically, the battery module M2 includes a plurality of battery cells 1 and a frame structure for fixing the battery cells 1, wherein the plurality of battery cells 1 are stacked on each other in the length direction X. The frame structure may include end plates 3, the end plates 3 being located at two ends of the single battery 1 along the length direction X for limiting the movement of the single battery 1 along the length direction X, and in one embodiment, the frame structure may further include side plates 4, the two side plates 4 being located at two sides of the single battery 1 along the width direction Y, and the side plates 4 being connected with the end plates 3, thereby forming a frame structure; in another embodiment, the frame structure may be provided without side plates 4, and the end plates 3 and the bands may be connected by a first band or by a first band and a second band after the battery cells 1 are stacked to form the frame structure.

Specifically, the battery cells 1 include the electrode leads 11, and each battery cell 1 includes a positive electrode lead and a negative electrode lead, in the battery module M2, a plurality of battery cells 1 are electrically connected to form a circuit of the battery module M2, and each battery cell 1 may be connected in series and/or parallel, and the battery cells 1 are connected by the electrical connection member 2, for example, when the battery cells 1 are connected in series, the positive electrode lead of one battery cell 1 and the negative electrode lead of another battery cell 1 are connected by the electrical connection member 2.

Specifically, in the present embodiment, as shown in fig. 5, the electrode lead 11 includes a first body portion 111 and a first extension portion 112, the first body portion 111 protrudes relative to the first extension portion 112 along the height direction Z of the battery module, and the first body portion 111 protrudes along the outer side of the battery cell 1; accordingly, as shown in fig. 6, the electrical connection member 2 includes a second body portion 21 and a second extension portion 22, the second body portion 21 protrudes relative to the second extension portion 22 along the height direction Z, and the second body portion 21 protrudes along the outside of the battery cell 1, i.e., the second body portion 21 protrudes in the same direction as the first body portion 111 of the electrode lead 11.

Therefore, when the electrode lead 11 is connected to the electrical connection portion 2, the first body portion 111 of the electrode lead 11 is connected to the second body portion 21 of the electrical connection portion 2, and the first extension portion 112 of the electrode lead 11 is connected to the second extension portion 22 of the electrical connection portion 2.

In this embodiment, the electrode lead 11 of the battery cell 1 includes at least two connection faces, and similarly, the electric connection part 2 also includes at least two connection faces, and when the two are connected, at least two connection faces are correspondingly connected, so that the connection area between the two is large, thereby improving the connection reliability between the two, and simultaneously, the flow area after the two are connected can also be increased, the risk that the connection position of the electrode lead 11 and the electric connection part 2 generates heat in the working process of the battery module is reduced, and the safety and the service life of the battery module are improved.

In one possible design, as shown in fig. 6 and 8, in the electrical connection component 2, the second extension portion 22 is provided with one or more limiting portions 24, and the number of the limiting portions 24 may be one or more; accordingly, as shown in fig. 5, in the electrode lead 11, the first extending portion 112 is provided with one or more engaging portions 114, and the number of the engaging portions 114 may be one or more, and the engaging portions 114 are arranged in a one-to-one correspondence with the position-limiting portions 24, and when the electrode lead 11 is connected to the electrical connection component 2, the position-limiting portions 24 are correspondingly connected to the engaging portions 114.

In this embodiment, the electrode lead 11 and the electrically connecting component 2 are limited by the connection between the limiting portion 24 and the matching portion 114, that is, the electrode lead 11 and the electrically connecting component 2 are mechanically connected, which can simplify the assembly process of the battery module, prevent the influence of the over-high temperature on the battery cell 1 during the welding process, and prolong the service life of the battery module, compared with the prior art in which the electrode lead 11 and the electrically connecting component 2 are welded.

Specifically, as shown in fig. 7 and 8, the position-limiting portion 24 has a position-limiting hole 242 and an upper end surface 243, wherein the engaging portion 114 protrudes from the first extending portion 112, and as shown in fig. 5 and 10, along the height direction Z, the engaging portion 114 includes a first section 114a and a second section 114b, wherein the first section 114a is connected with the first extending portion 112, and the size of the first section 114a is smaller than that of the second section 114b, so that a step surface 114c is formed between the first section 114a and the second section 114 b. As shown in fig. 11, when the engaging portion 114 engages with the position-limiting portion 24, the first section 114a of the engaging portion 114 engages with the position-limiting hole 242 (at least a portion of the first section 114a extends into the position-limiting hole 242), and the second section 114b extends out of the position-limiting hole 242, and after extending out, the stepped surface 114c abuts against the upper end surface 243 of the position-limiting portion 24 along the height direction Z.

In this embodiment, when the step surface 114c of the matching portion 114 abuts against the upper end surface 243 of the limiting portion 24, the limiting portion 24 is limited between the second section 114b and the first extending portion 112, and the relative movement of the matching portion 114 and the limiting portion 243 along the height direction Z can be limited, so that the connection between the electrical connection component 2 and the electrode lead 11 along the height direction Z is realized, and the two are connected in a clamping manner without welding.

More specifically, as shown in fig. 7, in the electrical connecting component 2, the second extending portion 22 is opened with a through hole 221, and the limiting portion 24 of the electrical connecting component 2 includes a plurality of claws 241, the plurality of claws 241 are arranged along the circumferential direction of the through hole 221, and the plurality of claws 241 surround the limiting hole 242, that is, the limiting hole 242 is communicated with the through hole 221. As shown in fig. 7, the jaws 241 have a first end 241a and a second end 241b opposite to each other along the height direction Z, the second end 241b is connected to the second extending portion 22, and the first end 241a of each jaw 241 forms the upper end face 243.

Therefore, when the position-limiting portion 24 is engaged with the engaging portion 114, as shown in fig. 11, the position-limiting portion 114 passes through the through hole 221 and extends into the position-limiting hole 242, and the second section 114b of the position-limiting portion 114 extends out of the position-limiting hole 242, so as to achieve connection between the position-limiting portion 24 and the engaging portion 114.

As shown in fig. 11, the engaging portion 114 is in interference fit with each of the claws 241, specifically, the step surface 114c of the engaging portion 114 may be in interference fit with the upper end surface 243 of the position-limiting portion 24, that is, the step surface 114c is in interference fit with the top of the claw 241, and meanwhile, the claw 241 of the position-limiting portion 24 may also be in interference fit with the first section 114a of the engaging portion 114, so as to further improve the connection reliability between the position-limiting portion 24 and the engaging portion 114.

In addition, the interference magnitude between the stepped surface 114c and the upper end surface 243, and the interference magnitude between the clamping jaw 241 and the first segment 114a may be set according to actual working conditions, as long as reliable connection between the limiting portion 24 and the matching portion 114 can be achieved.

More specifically, as shown in fig. 7, the jaws 241 are spaced apart along the circumferential direction of the through-hole 221, i.e., a gap is provided between adjacent jaws 241.

In this embodiment, the claws 241 arranged at intervals are elastically deformed, and after the claws 241 are deformed, the size of the limiting hole 242 can be changed. When the position-limiting portion 114 extends into the position-limiting hole 242 (defined by the claws 241), the claws 241 can be separated from each other under the action of the position-limiting portion 114, so that the position-limiting portion 114 can be installed, and the claws 241 can be elastically deformed, so that the second section 114b of the position-limiting portion 114 can extend out from between the claws 241. After the second section 114b extends out, under the action of the resilience force of the claws 241, the claws 241 can approach each other, so that the first section 114a of the limiting part 114 is clamped by the claws 242, and the connection reliability between the claws 242 and the limiting part 114 is improved.

The claws 241 can be uniformly distributed on the periphery of the through hole 221, so that the acting force of the claws 242 on the limiting portion 114 is uniform, and the connection reliability between the limiting portion 114 and the matching portion 24 is further improved.

In one embodiment, as shown in fig. 7, the jaws 241 are close to each other in a direction from the second end 241b toward the first end 241a, i.e., in a direction away from the through hole 221, and the cross-sectional area of the stopper hole 242 is gradually reduced.

In this embodiment, as shown in fig. 7, the through hole 221 is communicated with the limiting hole 242, and the limiting portion 114 enters the limiting hole 242 through the through hole 221, so that the second section 114b of the limiting portion 114 can enter the limiting hole 242, the sectional area of the through hole 242 should not be smaller than that of the second section 114b, and meanwhile, the second section 114b can extend out of the limiting hole 242, and the stepped surface 114c is abutted to the upper end surface 243 of the matching portion 24.

Specifically, as shown in fig. 10, the outer contour of the second segment 114b is arc-shaped, and as described above, in the process of fitting the fitting portion 24 and the limiting portion 114, the second segment 114b of the limiting portion 114 moves in the limiting hole 243 of the fitting portion 24, so that when the outer contour of the second segment 114b is arc-shaped, the resistance of the limiting portion 114 to the movement of the fitting portion 24 can be reduced, and meanwhile, the wear of the limiting portion 114 to the fitting portion 24 in the movement process can be reduced, and the service lives of the two parts can be prolonged.

More specifically, as shown in fig. 6, the second extension part 22 of the electrical connection member 2 is provided with four engaging parts 24, and two of the four engaging parts 24 are arranged in the length direction X and two are arranged in the width direction Y, and accordingly, as shown in fig. 5, the two first position-limiting parts 112 of the electrode lead 11 are respectively provided with position-limiting parts 114, and the two position-limiting parts 114 are arranged in the width direction Y. As shown in fig. 3 and 4, the fitting portions 24 arranged along the width direction Y are respectively used for fitting with two position-limiting portions 114 of the same electrode lead 11, and two pairs of fitting portions 24 arranged along the length direction X are respectively used for fitting with position-limiting portions 114 of adjacent electrode leads 11, so as to form the structure shown in fig. 3 and 4.

In this embodiment, the spacing between the electrode lead 11 and the electrical connection component 2 along the length direction X, the width direction Y, and the height direction Z can be limited by the cooperation of the limiting portions 114 and the fitting portion 24, so that the mechanical connection between the electrode lead 11 and the electrical connection component 2 is realized, and the high-temperature damage caused by the excessively high temperature during the welding of the electrode lead 11 and the electrical connection component 2 can be avoided while the reliability of the connection between the electrode lead and the electrical connection component is improved.

On the other hand, as shown in fig. 5 and 10, the cross-sectional area of the first body portion 111 is gradually reduced in a direction away from the first extension portion 112, that is, the cross-section of the first body portion 111 is a trapezoid, and the side wall thereof is an inclined wall 111a, and accordingly, as shown in fig. 6 and 8, the electrical connection component 2 further includes a transition portion 23, the transition portion 23 is connected between the second body portion 21 and the second extension portion 22, and the transition portion 23 is disposed obliquely.

In the present embodiment, as shown in fig. 11, when the electrode lead 11 is mated with the electrical connection component 2, the obliquely arranged transition portion 23 can be fitted with the inclined wall 111a of the first body portion 111 having a trapezoidal structure, so as to improve the connection reliability between the electrical connection component 2 and the electrode lead 11, and at the same time, the transition portion 23 can be abutted against the inclined wall 111a, so as to increase the flow area between the electrode lead 11 and the electrical connection component 2.

In the above embodiments, as shown in fig. 10, the first body portion 111 of the electrode lead 11 is opened with the groove 113, and the groove 113 extends in a direction away from the electrical connection part 2, and correspondingly, as shown in fig. 8, the second body portion 21 of the electrical connection part 2 is provided with the protrusion 25, and the protrusion 25 protrudes in a direction close to the electrode lead 11, and when the electrical connection part 2 is connected with the motor lead 11, the protrusion 25 can be located in the corresponding groove 113, so that the connection between the first body portion 111 and the second body portion 21 is realized.

Specifically, the sectional area of the protrusion 25 is gradually reduced in a direction toward the electrode lead 11, and the sectional area of the groove 113 is gradually increased in a direction away from the electrical connection part 2, so that the protrusion 25 and the groove 113 are interference-fitted.

In this embodiment, in the process of matching the protrusion 25 with the groove 113, the interference between the protrusion 25 and the groove 113 is gradually increased in a direction toward the inside of the battery cell 1 (from top to bottom direction shown in fig. 11), and the interference between the protrusion 25 and the groove 113 may be set according to specific conditions, and in order to enable the electrical connection member 2 to be assembled with the electrode lead 11 normally, the interference between the protrusion 25 and the groove 113 should not be too large.

In summary, in the embodiment of the present application, the electrical connection component 2 and the electrode lead 11 do not need to be connected by welding, but are mechanically connected, specifically, the mechanical connection between the electrical connection component 2 and the electrode lead 11 is realized by the clamping connection between the limiting portion 114 and the fitting portion 24 and the interference fit between the protrusion 25 and the groove 113, and a large flow area can be formed between the two.

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

Claims (12)

1. A battery module (M2), characterized in that the battery module (M2) comprises:

a battery cell (1), the battery cell (1) comprising an electrode lead (11);

an electrical connection member (2), the electrical connection member (2) connecting the electrode leads (11) of the battery cells (1);

wherein the electrode lead (11) includes a first body part (111) and a first extension part (112), the first body part (111) protruding with respect to the first extension part (112) in a height direction (Z) of the battery module (M2);

the electrical connection component (2) comprises a second body portion (21) and a second extension portion (22), the second body portion (21) projecting relative to the second extension portion (22) in a height direction (Z);

the first body part (111) is connected to the second body part (21), and the first extension part (112) is connected to the second extension part (22).

2. The battery module (M2) according to claim 1, wherein the second extension portion (22) is provided with a stopper portion (24), the first extension portion (112) is provided with a fitting portion (114), and the stopper portion (24) is connected to the fitting portion (114).

3. The battery module (M2) according to claim 2, wherein the stopper portion (24) has a stopper hole (242) and an upper end surface (243);

the matching part (114) protrudes out of the first extending part (112), and the matching part (114) comprises a first section (114a) and a second section (114 b);

the first section (114a) is connected with the first extension part (112), and the size of the first section (114a) is smaller than that of the second section (114b), so that a step surface (114c) is formed between the first section (114a) and the second section (114 b);

the first section (114a) is matched with the limiting hole (242), the second section (114b) extends out of the limiting hole (242), and the step surface (114c) is abutted to the upper end surface (243).

4. The battery module (M2) according to claim 3, wherein the second extension (22) is opened with a through hole (221);

the limiting part (24) comprises a plurality of clamping jaws (241), the clamping jaws (241) are arranged along the circumferential direction of the through hole (221), and the plurality of clamping jaws (241) enclose the limiting hole (242);

in the height direction (Z), the jaws (241) have a first end portion (241a) and a second end portion (241b), the second end portion (241b) being connected with the second extension (22), the first end portion (241a) of each jaw (241) forming the upper end surface (243).

5. The battery module (M2) of claim 4, wherein each of the jaws (241) is spaced apart.

6. The battery module (M2) according to claim 4, wherein the jaws (241) are close to each other in a direction from the second end (241b) toward the first end (241 a).

7. The battery module (M2) according to claim 4, wherein the stopper portion (24) is in interference fit with each of the claws (241).

8. The battery module (M2) according to any one of claims 3-7, wherein the outer contour of the second section (114b) is arc-shaped.

9. The battery module (M2) according to any one of claims 1-7, wherein the first body portion (111) has a gradually decreasing cross-sectional area in a direction away from the first extension portion (112);

the electrical connection component (2) further comprises a transition portion (23), the transition portion (23) being connected between the second body portion (21) and the second extension portion (22);

the transition part (23) is obliquely arranged.

10. The battery module (M2) according to any one of claims 1-7, wherein the first body portion (111) is grooved (113) and the second body portion (21) is provided with a protrusion (25);

the sectional area of the protrusion (25) is gradually reduced along the direction towards the electrode lead (11), and the sectional area of the groove (113) is gradually increased along the direction away from the electric connecting part (2);

the protrusion (25) is in interference fit with the groove (113).

11. A battery pack (M), characterized in that the battery pack (M) comprises:

a box (M1), the box (M1) having a containing cavity (M13);

a battery module (M2), the battery module (M2) being the battery module (M2) of any one of claims 1 to 10;

wherein the battery module (M2) is accommodated in the accommodation cavity (M13).

12. A device (D) using a battery cell (1) as a power source, characterized in that it comprises:

a power source for providing a driving force for the device (D); and the combination of (a) and (b),

the battery module (M2) according to any one of claims 1 to 10, or the battery pack (M) according to claim 11, configured to supply electrical energy to the power source.

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