CN209747626U - battery module - Google Patents

Abstract

The embodiment of the application provides a battery module, includes: a battery assembly including a plurality of battery cells, the battery assembly having an output electrode connection part; end plates disposed at both ends of the battery module in a length direction; a fastener connecting the output electrode connecting part and the end plate; wherein, at the output pole of battery module, output pole connecting portion are provided with dodges the portion, dodge the portion and cave in towards battery pack's direction. In this application, set up in the portion of dodging of output pole connecting portion and sunken towards the direction of battery module, and should dodge the portion and be used for dodging the fastener to make behind output pole connecting portion and the end plate, can reduce the space of the battery module that fastener and output pole connecting portion occupy, thereby increase battery pack's the space of arranging, improve the capacity and the energy density of battery module. Meanwhile, after the output electrode connecting part is connected with the end plate through the fastening piece, the connection reliability between the output electrode connecting part and the end plate can be improved.

Description

Battery module

[ technical field ] A method for producing a semiconductor device

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

[ background of the invention ]

The battery module comprises a shell and a plurality of battery units located in the inner cavity of the shell, the battery units are provided with electric connecting terminals, adjacent electric connecting terminals are connected through connecting pieces, and therefore electric connection between adjacent battery units is achieved.

In the existing battery module, after the output electrode connecting part is connected with the end plate, the occupied space of the battery module is larger, and the capacity and the energy density of the battery module are reduced.

[ Utility model ] content

in view of this, the present application provides a battery module, so as to solve the problem in the prior art that the battery module capacity is low due to the fact that the output electrode connecting portion occupies a large space after being connected with the end plate.

the embodiment of the application provides a battery module, battery module includes:

A battery assembly including a plurality of battery cells, the battery assembly having an output electrode connection part;

end plates disposed at both ends of the battery assembly in a length direction;

A fastener connecting the output pole connecting portion and the end plate;

the output electrode of the battery module is provided with an avoiding part facing the direction of the battery assembly.

In one possible design, the output electrode connecting portion includes a first connecting piece connected to the battery module and a second connecting piece connected to the fastening member;

At the output pole of the battery module, the first connecting piece is positioned at the end part of the battery assembly along the length direction;

The avoiding part is arranged on the first connecting piece and used for avoiding the fastening piece.

in one possible embodiment, the second connecting piece is bent relative to the first connecting piece in a direction away from the battery pack.

In one possible design, at the output electrode of the battery module, the end plate is provided with a recess portion to which at least part of the fastening member is attached in the length direction.

In one possible design, the fastener includes a first connection portion, the recess includes a first groove;

Along length direction, first connecting portion joint in first recess.

In one possible design, the first groove is provided with a first limiting wall and a second limiting wall which are oppositely arranged along the length direction;

along the length direction, the first connecting part is provided with a first matching wall and a second matching wall which are oppositely arranged;

the first matching wall is abutted against the first limiting wall, and the second matching wall is abutted against the first limiting wall.

in one possible design, the first groove has a first side wall and a second side wall which are oppositely arranged along the width direction;

Along the width direction, the first connecting part is provided with a third matching wall and a fourth matching wall which are oppositely arranged;

the third matching wall is abutted against the first side wall, and the fourth matching wall is abutted against the second side wall.

In one possible design, the recess has the same dimensions as the fastener in the height direction.

in one possible design, the fastener further comprises a second connecting portion for connecting with the output pole connecting portion;

The first limiting wall is close to the inner side of the battery pack and provided with an opening, and part or all of the second connecting part extends out of the opening.

In one possible design, the output electrode connecting part is provided with a first mounting hole, and the second connecting part is provided with a second mounting hole;

the output pole connecting part is connected with the fastening piece through the first mounting hole and the second mounting hole.

in one possible design, the second connecting portion includes a straight section and an arc section, the straight section is fixedly connected with the first connecting portion,

the concave part also comprises a second groove, and the straight section is matched with the second groove;

the arc section protrudes out of the end plate.

In one possible design, the battery module further comprises an upper cover located at the upper end of the battery assembly in the height direction;

the upper cover is provided with an installation part which extends downwards along the height direction;

The upper end of end plate is provided with dodges the breach, dodge the breach with the installation department corresponds the setting, the depressed part is located dodge the below of breach.

in this application, set up in the portion of dodging of output pole connecting portion and sunken towards the direction of battery module, and should dodge the portion and be used for dodging the fastener to make behind output pole connecting portion and the end plate, can reduce the space of the battery module that fastener and output pole connecting portion occupy, thereby increase battery pack's the space of arranging, improve the capacity and the energy density of battery module. Meanwhile, after the output electrode connecting part is connected with the end plate through the fastening piece, the connection reliability between the output electrode connecting part and the end plate can be improved.

[ description of the drawings ]

in order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a battery module provided in the present application in one embodiment;

FIG. 2 is a schematic view of the end plate, side plate and fastener of FIG. 1;

FIG. 3 is an enlarged view of a portion I of FIG. 2;

FIG. 4 is a schematic view of the structure of FIG. 3 with the fastener removed;

FIG. 5 is a schematic structural view of the fastener of FIG. 3;

FIG. 6 is a schematic view of the fastener of FIG. 2 shown mounted to an end plate;

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

FIG. 8 is a schematic structural view of the battery module of FIG. 1;

fig. 9 is a top view of the battery module shown in fig. 1 with an upper cover removed;

FIG. 10 is a sectional view taken along line A-A of FIG. 9;

Fig. 11 is a partial enlarged view of a portion iii in fig. 10.

Reference numerals:

A-a battery module;

1-an end plate;

11-a recess;

111-a first recess;

111 a-a first stop wall;

111 b-a second stop wall;

111 c-opening;

111 d-first side wall;

111 e-a second sidewall;

112-a second groove;

112 a-third side wall;

112 b-a fourth side wall;

12-avoiding a notch;

121-bottom wall;

13-a reinforcement;

2-side plate;

3-covering the cover;

31-a mounting portion;

4-a battery assembly;

41-battery cell;

42-output pole connection;

421-a first connecting piece;

421 a-an escape part;

422-a second connecting sheet;

422 a-first mounting hole; 5-a fastener;

51-a first connection;

511-a first mating wall;

512-a second mating wall;

513-a third mating wall;

514-a fourth mating wall;

52-a second connection;

521-a straight section;

522-arc segment;

523-second mounting hole;

6-bottom plate.

[ detailed description ] embodiments

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.

Referring to fig. 1 to 11, fig. 1 is a schematic structural diagram of a battery module provided in the present application in an embodiment; FIG. 2 is a schematic view of the end plate, side plate and fastener of FIG. 1; FIG. 3 is an enlarged view of a portion I of FIG. 2; FIG. 4 is a schematic view of the structure of FIG. 3 with the fastener removed; FIG. 5 is a schematic structural view of the fastener of FIG. 3; FIG. 6 is a schematic view of the fastener of FIG. 2 shown mounted to an end plate; FIG. 7 is an enlarged view of a portion II of FIG. 6; FIG. 8 is a schematic structural view of the battery module of FIG. 1; fig. 9 is a top view of the battery module shown in fig. 1 with an upper cover removed; FIG. 10 is a sectional view taken along line A-A of FIG. 9; fig. 11 is a partial enlarged view of a portion iii in fig. 10.

the embodiment of the application provides a battery module a, as shown in fig. 1, the battery module a includes a plurality of battery units 41 and a frame structure, wherein, the battery unit 41 can be a secondary battery capable of being repeatedly charged and discharged for use, and can be a pouch battery, a square battery or a cylindrical battery, the plurality of battery units 41 are stacked to form a battery assembly 4, the stacking direction can be a length direction X, a width direction Y or a height direction Z, and the battery assembly 4 is located in an inner cavity formed by the frame structure.

wherein, this frame construction includes two end plates 1, two curb plates 2, upper cover 3 and bottom plate 6, and two end plates 1 are located battery pack 4 respectively along length direction X's both ends, and two side plates 2 are located battery pack 4 respectively along width direction Y's both sides, and upper cover 3 is located battery pack 4's top, and bottom plate 6 is located battery pack 4's below.

In order to enable the battery module a to output a high voltage, the battery unit 4 is provided with an output electrode connection part 42, and each battery unit 41 is electrically connected through an electrical connection terminal and is electrically connected to the output electrode connection part 42 so as to be able to output electrical energy through the output electrode connection part 42, and therefore, the output electrode connection part 42 is provided at the output electrode of the battery module a, and the battery module a includes two output electrode connection parts 42, which are a positive electrode connection part and a negative electrode connection part, respectively, for electrically connecting with the negative electrode and the positive electrode of the electric device (or the adjacent battery module a), thereby realizing output of electrical energy (or series connection of the battery modules a).

meanwhile, as shown in fig. 1, the battery module a further includes a fastening member 5, where the fastening member 5 is located at the output electrode of the battery module a and is used for connecting the output electrode connecting portion 42 with the end plate 1, so as to connect the output electrode connecting portion 42 with the end plate 1 into a whole, and the output electrode connecting portion 42 is provided with a relief portion 421a at the output electrode of the battery module a, and the relief portion 421a is recessed toward the battery assembly 4.

in this application, the avoiding portion 421a provided in the output electrode connecting portion 42 is recessed toward the direction of the battery module 4, and the avoiding portion 421a is used to avoid the fastener 5, so that the space of the battery module a occupied by the fastener 5 and the output electrode connecting portion 42 can be reduced after the fastener 5 is connected to the output electrode connecting portion 42 and the end plate 1, thereby increasing the arrangement space of the battery assembly 4 and improving the capacity and energy density of the battery module a. Meanwhile, after the output electrode connecting portion 42 and the end plate 1 are connected by the fastening member 5, the connection reliability between the two can be improved.

the output electrode connecting portion 42 includes a first connecting piece 421 and a second connecting piece 422, the first connecting piece 421 is located at an end portion of the battery pack 4 along the length direction X at the output electrode of the battery module a and is used for being connected to an electrical connection terminal of the battery unit 41, the second connecting piece 422 is connected to the fastening member 421, and the escape portion 421a is provided on the first connecting piece 421.

as shown in fig. 11, in order to fixedly connect the second connection piece 422 and the second connection portion 52, the second connection portion 52 extends in the direction of the first connection piece 421, and in order to ensure the connection reliability of the second connection piece 422 and the second connection portion 52, the area of the end surface where the second connection piece 422 and the second connection portion 52 are in contact needs to be large enough, so that the second connection portion 52 has a large enough extension amount, and in order to avoid interference between the second connection portion 52 and the first connection piece 421, the first connection piece 421 is provided with a relief portion 421a, and the relief portion 421a is recessed in the direction of the battery pack 4 to relieve the second connection portion 52 of the fastener 5, and the relief portion 421a can reduce the space in the length direction X occupied by the fastener 5 after being connected to the output electrode connection portion 42, thereby further improving the capacity and energy density of the battery module a. In addition, as shown in fig. 11, an end surface of the first connecting piece 421 is perpendicular to the length direction X, the second connecting piece 422 is bent relative to the first connecting piece 421, and the first connecting piece 421 is perpendicular to the second connecting piece 422, that is, the end surface of the second connecting piece 422 is perpendicular to the height direction Z, so that the second connecting piece 422 is bent relative to the first connecting piece 421 in a direction away from the battery assembly 4. As shown in fig. 11, the second connecting piece 422 is located above the fastening member 5 and abuts against the upper end surface of the second connecting portion 52 in the fastening member 5.

In one possible design, as shown in fig. 3, the end plate 1 is provided with a recess 11 at the output pole of the battery module a, and at least part of the fastening member 5 is fitted to the recess 11 in the longitudinal direction X.

in this application, because the output electrode connecting portion 42 is connected with the end plate 1 as a whole through the fastener 5, when the battery module a vibrates, the relative movement between the output electrode connecting portion 42 and the end plate 1 can be reduced, thereby preventing the output electrode connecting portion 42 and the electric connection terminal from being damaged due to the vibration of the battery module a, and improving the reliability of the battery module a. Meanwhile, by installing the fastening member 5 at least partially in the recessed portion 11, after the fastening member 5 is installed in the end plate 1, the space of the battery module a occupied by the fastening member is reduced in the length direction X, and the end plate 1 does not need to be provided with a large thickness, so that the arrangement space of the battery assembly 4 in the inner cavity of the frame structure is increased, and the capacity and the energy density of the battery module a are improved.

Specifically, as shown in fig. 3 and 5, the fastening member 5 includes a first connecting portion 51, as shown in fig. 3 and 4, the recess 11 includes a first groove 111, and the first groove 111 is disposed on the end plate 1, and along the length direction X, the first connecting portion 51 is clamped in the first groove 111.

in this embodiment, when the first connecting portion 51 is connected to the first groove 111 in a clamped manner, at least the first connecting portion 51 is located in the recess 11 of the fastening member 5, and does not occupy the inner space of the end plate 1, and the fastening member 5 can be connected to the end plate 1 by the first connecting portion 51 being connected to the first groove 111 in a clamped manner.

more specifically, as shown in fig. 4, the first groove 111 has a first stopper wall 111a and a second stopper wall 111b disposed opposite to each other in the length direction X; as shown in fig. 5, the first connection portion 51 has a first fitting wall 511 and a second fitting wall 512 which are oppositely arranged along the length direction X, and with reference to fig. 3 and 7, the first fitting wall 511 abuts against the first limiting wall 111a, and the second fitting wall 512 abuts against the first limiting wall 111a, so that the first connection portion 51 and the first groove 111 are fixedly connected along the length direction X, and when the battery module a vibrates, the fastening member 5 and the end plate 1 can be relatively stationary along the length direction X.

Meanwhile, as shown in fig. 4, the first groove 111 has a first side wall 111d and a second side wall 111e which are oppositely disposed in the width direction Y; as shown in fig. 5, the first connection portion 51 has a third mating wall 513 and a fourth mating wall 514 oppositely arranged in the width direction Y; with reference to fig. 3 and 7, the third mating wall 513 abuts against the first side wall 111d, and the fourth mating wall 514 abuts against the second side wall 111e, so that the first connection portion 51 is fixedly connected to the first groove 111 along the width direction Y, and when the battery module a vibrates, the fastening member 5 and the end plate 1 can be relatively stationary along the width direction Y.

As shown in fig. 4, in the first groove 111, the first limiting wall 111a and the second limiting wall 111b are perpendicular to the first side wall 111d and the second side wall 111e, that is, the first groove 111 is a rectangular groove. Meanwhile, as shown in fig. 5, in the first connection portion 51, the first and second mating walls 511 and 512 are perpendicular to the third and fourth mating walls 513 and 514, that is, the first connection portion 51 has a rectangular structure, and the first groove 111 is matched with the first connection portion 51.

Of course, the first groove 111 and the first connection portion 51 may also have other shapes, such as a diamond shape, a polygon shape, etc., however, in this embodiment, the groove 111 and the first connection portion 51 having a rectangular structure have the advantages of simple structure and convenient processing.

in one possible design, as shown in FIG. 5, the fastener 5 further includes a second connection portion 52, the second connection portion 52 being adapted to connect to the output pole connection portion 42. Therefore, in the fastening tool 5, the first connection portion 51 is fixedly connected to the end plate 1, and the second connection portion 52 is fixedly connected to the output electrode connection portion 42.

as shown in fig. 4, in the recessed portion 11, the first limiting wall 111a of the first groove 111 is close to the battery assembly 4, that is, the first limiting wall 111a is located inside the second limiting wall 111b, the first limiting wall 111a has an opening 111c, a part or all of the second connecting portion 52 protrudes from the opening 111c, and a part or all of the second connecting portion 52 protrudes from the inner end surface of the end plate 1 along the length direction X.

In this embodiment, since the output electrode connecting portion 42 is located inside the end plate 1, the second connecting portion 52 of the fastening member 5 protrudes from the inner end surface of the end plate 1, and the fixed connection between the output electrode connecting portion 42 and the fastening member 5 can be conveniently achieved.

Specifically, as shown in fig. 5, the second connecting portion 52 includes a straight section 521 and an arc section 522, wherein the straight section 521 is fixedly connected with the first connecting portion 51, and the arc section 522 protrudes from the end plate 1; as shown in fig. 4, the recess 11 further includes a second groove 112, the second groove 112 is communicated with the first groove 111 through the opening 111c, so that the straight section 521 and the circular arc section 522 protrude from the opening 111c of the first groove 111, and the straight section 521 is matched with the second groove 112.

as shown in fig. 4, the second groove 112 has a third sidewall 112a and a fourth sidewall 112b opposite to each other along the width direction Y, and the third sidewall 112a and the fourth sidewall 112b are parallel to each other, so that the second groove 112 has a rectangular structure, and therefore, in the recess 11, the first groove 111 and the second groove 112 are both rectangular grooves, and the two rectangular grooves have different sizes along the width direction Y.

As shown in fig. 7, the straight section 521 is adapted to the second groove 112, and the circular arc section 522 extends from the second groove 112, so that, in the fastening member 5, both the first connecting portion 51 and the straight section 521 are clamped with the recessed portion 11 of the end plate 1, and only the circular arc section 522 extends out of the inner end surface of the end plate 1, so that the fastening member 5 occupies a smaller space inside the frame structure of the battery module a, thereby further increasing the capacity of the battery module a.

specifically, as shown in fig. 8 and 9, the output electrode connecting portion 42 is opened with a first mounting hole 422a, as shown in fig. 5, the second connecting portion 52 is opened with a second mounting hole 523, and the first mounting hole 422a is communicated with the second connecting hole 523, and the two are connected by a connecting member such as a bolt. In the second connecting portion 52, a part of the second mounting hole 523 is located at the straight section 521, and another part is located at the circular-arc section 522.

it is understood that the circular arc segment 522 does not have to be a circular arc structure, but may be other structures commonly used in the art, such as a rectangular structure, etc., however, since the circular arc segment 522 and the straight segment 521 are provided with the circular second mounting hole 523, the volume and the weight of the circular arc segment 522 are minimized when the circular arc structure is adopted, thereby contributing to the improvement of the energy density of the battery module a.

When the battery module A is assembled, the output electrode connecting part 42 is firstly fixed on the electrode assembly 4, the fastener 5 is fixed on the output electrode connecting part 42, the assembled electrode assembly 4 is assembled into the inner cavity of the frame structure from top to bottom, and in the assembling process, the first connecting part 51 and the straight section 521 of the fastener 5 can be connected with the concave part 11 in a clamping manner, so that the connection between the fastener 5 and the end plate 1 can be realized, and meanwhile, the interference between the fastener 5 and the end plate 1 can be avoided. Of course, when the battery module a is assembled, the output electrode connecting part 42 is fixed to the electrode assembly 4 and is put into the inner cavity of the frame structure from the top down, and then the fastening member 5 is put in, since the end surface of the second connection piece 422 of the output electrode connecting part 42 is perpendicular to the height direction Z, the fastening member 5 needs to be put in from the side.

In the above embodiments, as shown in fig. 1, the battery module a further includes the upper cover 3, the upper cover 3 is located at the upper end of the battery assembly 4 along the height direction Z, and the upper cover 3 is provided with the mounting portion 31, the mounting portion 31 extends downward along the height direction Z, and when the upper cover 3 is fixedly connected with the end plate 1, the mounting portion 31 is used for protecting the connection structure between the upper cover 3 and the end plate 1. Accordingly, as shown in fig. 3, the upper end of the end plate 1 is provided with an avoiding notch 12, the avoiding notch 12 is provided corresponding to the mounting portion 31, and when the upper cover 3 is fixedly connected to the end plate 1, the mounting portion 31 abuts against the bottom wall 121 of the avoiding notch 12, or the mounting portion 31 does not abut against the bottom wall 121 of the avoiding portion 12, that is, a gap is provided between the mounting portion 31 and the bottom wall 121, and the avoiding portion 12 can avoid the mounting portion 31 and the output electrode base as long as the finger can be prevented from extending into the gap.

Meanwhile, as shown in fig. 3, the recess 11 for connecting the fastener 5 is located below the avoidance gap 12.

In addition, the size of the recess 11 in the height direction Z is not mathematically exactly the same as the size of the fastener 5 as long as both can be fitted in the height direction Z, and therefore, both may have substantially the same size.

In the above embodiments, as shown in fig. 2, the end plate 1 is provided with a reinforcing part 13 near the inner end face of the cell assembly 4, and in a possible design, the reinforcing part 13 may be a plurality of reinforcing ribs arranged in a cross manner.

After the end plate 1 is provided with the recessed portion 11 and the avoiding notch 12, the strength and rigidity of the end plate 1 are inevitably reduced, and in the embodiment, the strength and rigidity of the end plate 1 can be improved by providing the reinforcing portion 13, so that the performance of the battery module a is improved.

the above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.

Claims (12)

1. The utility model provides a battery module which characterized in that, battery module includes:

A battery assembly including a plurality of battery cells, the battery assembly having an output electrode connection part;

End plates disposed at both ends of the battery assembly in a length direction (X);

A fastener connecting the output pole connecting portion and the end plate;

The output electrode of the battery module is provided with an avoiding part facing the direction of the battery assembly.

2. The battery module according to claim 1, wherein the output electrode connection part includes a first connection tab connected to the battery pack and a second connection tab connected to the fastener;

At the output pole of the battery module, the first connecting piece is positioned at the end part of the battery assembly along the length direction (X);

the avoiding part is arranged on the first connecting piece and used for avoiding the fastening piece.

3. the battery module according to claim 2, wherein the second connecting tab is bent with respect to the first connecting tab in a direction away from the battery assembly.

4. the battery module according to claim 1, wherein the end plate is provided with a recess, to which at least part of the fastening member is mounted in a length direction (X), at an output pole of the battery module.

5. the battery module according to claim 4, wherein the fastener includes a first connection portion, and the recess includes a first groove;

along length direction (X), first connecting portion joint in first recess.

6. the battery module according to claim 5, wherein the first groove has a first stopper wall and a second stopper wall that are oppositely disposed in the length direction (X);

the first connecting part is provided with a first matching wall and a second matching wall which are oppositely arranged along the length direction (X);

The first matching wall is abutted against the first limiting wall, and the second matching wall is abutted against the first limiting wall.

7. The battery module according to claim 5, wherein the first groove has first and second side walls disposed opposite to each other in the width direction (Y);

The first connecting part is provided with a third matching wall and a fourth matching wall which are oppositely arranged along the width direction (Y);

the third matching wall is abutted against the first side wall, and the fourth matching wall is abutted against the second side wall.

8. the battery module according to claim 4, wherein the recess has the same size as the fastener in a height direction (Z).

9. the battery module according to claim 6, wherein the fastener further comprises a second connection part for connecting with the output pole connection part;

the first limiting wall is close to the inner side of the battery pack and provided with an opening, and part or all of the second connecting part extends out of the opening.

10. The battery module as recited in claim 9, wherein the output electrode connecting portion defines a first mounting hole, and the second connecting portion defines a second mounting hole;

The output pole connecting part is connected with the fastening piece through the first mounting hole and the second mounting hole.

11. the battery module according to claim 9, wherein the second connecting portion includes a straight section and a circular-arc section, the straight section being fixedly connected with the first connecting portion,

The concave part also comprises a second groove, and the straight section is matched with the second groove;

the arc section protrudes out of the end plate.

12. the battery module according to any one of claims 4 to 11, further comprising an upper cover located at an upper end of the battery assembly in the height direction (Z);

The upper cover is provided with a mounting part which extends downwards along the height direction (Z);

the upper end of end plate is provided with dodges the breach, dodge the breach with the installation department corresponds the setting, the depressed part is located dodge the below of breach.