CN112332007A

CN112332007A - Battery module, battery pack, vehicle, and method for assembling battery module

Info

Publication number: CN112332007A
Application number: CN201910927445.7A
Authority: CN
Inventors: 于鑫
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2019-09-27
Filing date: 2019-09-27
Publication date: 2021-02-05
Anticipated expiration: 2039-09-27
Also published as: CN112332007B

Abstract

The invention provides a battery module, a battery pack, a vehicle and an assembling method of the battery module. The battery module comprises a plurality of batteries, a first side plate and a second side plate. The plurality of batteries are sequentially arranged along the length direction; the first side plate comprises a first main body part and a first protrusion part; the second side plate comprises a second main body part and a second protrusion part; the first main body part and the second main body part are positioned on two sides of the plurality of batteries along the width direction; the first protrusion is connected to the end part of the first main body part along the length direction, and the second protrusion is connected to the end part of the second main body part along the length direction; the first protrusion and the second protrusion are located on the same side of the plurality of batteries in the length direction; the number of the first protrusions is at least two; in the length direction, the first protruding parts and the second protruding parts are alternately arranged, and in a plane perpendicular to the length direction, the projection of the first protruding parts and the projection of the second protruding parts are at least partially overlapped; the first protrusion farthest from the battery in the longitudinal direction is fixed to the second protrusion.

Description

Battery module, battery pack, vehicle, and method for assembling battery module

Technical Field

The invention relates to the field of power batteries, in particular to a battery module, a battery pack, a vehicle and an assembling method of the battery module.

Background

In the use process of the battery module, the battery can expand continuously along with the increase of the charging and discharging cycle times, if the rigidity of the battery module is too high, the expansion force is larger and larger due to the fact that the expansion deformation cannot be released, and even exceeds the pressure range which can be borne by a battery shell, the battery is damaged, and the performance of the battery is directly influenced; if the rigidity of the battery module is too low, although the expansion force can be released, the battery module can generate large deformation, so that the problems that the battery module interferes with other components and the electrical safety distance is too small in the normal use process of the battery pack are caused.

Disclosure of Invention

In view of the drawbacks of the prior art, an object of the present invention is to provide a battery module, a battery pack, a vehicle, and a method for assembling a battery module, which are capable of adaptively adjusting a battery expansion force and reducing an influence of the battery expansion force on the battery module.

In order to achieve the above object, in a first aspect, the present invention provides a battery module including a plurality of batteries, a first side plate, and a second side plate. The plurality of batteries are sequentially arranged along the length direction; the first side plate comprises a first main body part and a first protrusion part; the second side plate comprises a second main body part and a second protrusion part; the first main body part and the second main body part are positioned on two sides of the plurality of batteries along the width direction; the first protrusion is connected to the end part of the first main body part along the length direction, and the second protrusion is connected to the end part of the second main body part along the length direction; the first protrusion and the second protrusion are located on the same side of the plurality of batteries in the length direction; the number of the first protrusions is at least two; in the length direction, the first protruding parts and the second protruding parts are alternately arranged, and in a plane perpendicular to the length direction, the projection of the first protruding parts and the projection of the second protruding parts are at least partially overlapped; the first protrusion farthest from the battery in the longitudinal direction is fixed to the second protrusion.

In one embodiment, the second protrusion is provided in plurality.

In one embodiment, the first protrusion has a first extending section and a first folding section, the first extending section extends along the width direction, and the first folding section folds back from the end of the first extending section along the width direction and extends toward the direction close to the end of the first main body part along the length direction.

In one embodiment, the second protrusion has a second extending section extending in the width direction and a second folded-back section folded back from an end of the second extending section in the width direction and extending in a direction close to an end of the second main body portion in the length direction.

In one embodiment, the at least two first protrusions and the first body portion are integrally molded, and the plurality of second protrusions and the second body portion are integrally molded.

In one embodiment, the first protrusion is provided with a protrusion and the second protrusion is provided with a groove, the protrusion being inserted into the groove.

In one embodiment, the first protrusion is provided with a groove and the second protrusion is provided with a protrusion, the protrusion being inserted into the groove.

In one embodiment, an overlapping dimension of an overlapping portion of a projection of the first protrusion and a projection of the second protrusion in the width direction in a plane perpendicular to the length direction is larger than half of a dimension of the battery in the width direction.

In one embodiment, the first protrusion farthest from the battery in the length direction is welded and fixed to the second protrusion.

In one embodiment, the battery module further includes an insulating plate disposed between the first protrusion or the second protrusion and a battery located at an end of the plurality of batteries in the length direction.

In a second aspect, the present invention provides a battery pack including the battery module according to the first aspect.

In a third aspect, the present invention provides a vehicle comprising a power source and the battery pack as set forth in the second aspect; the power source is used for providing driving force for the vehicle, and the battery pack is configured to provide electric energy for the power source.

In a fourth aspect, the present invention provides a method for assembling a battery module, including: providing a plurality of batteries, and arranging the batteries in sequence along the length direction; providing a first side plate and a second side plate, and placing the first side plate and the second side plate on two sides of the plurality of batteries along the width direction; moving the first side plate towards the direction close to the plurality of batteries, so that the first main body part of the first side plate is attached to the plurality of batteries, and the first protruding part is positioned on one side of the plurality of batteries in the length direction; moving the second side plate towards the direction close to the plurality of batteries, so that the second main body part of the second side plate is attached to the plurality of batteries, and the second protruding part is inserted between the first protruding parts; the first protrusion and the second protrusion, which are farthest from the battery in the longitudinal direction, are fixed.

The invention has the following beneficial effects:

in the battery module according to the present invention, the first side plate and the second side plate constitute a frame structure that fastens a plurality of batteries in a group, the first protrusions of the first side plate and the second protrusions of the second side plate are alternately arranged and inserted into each other in the longitudinal direction, and the first protrusions that are farthest from the batteries in the longitudinal direction are fixed to the second protrusions. The rigidity of the frame structure of the battery module can be increased along with the expansion deformation of the battery, the frame structure can restrict the expansion of the battery in turn, so that the deformation of the battery is not too large, and when the expansion force is too large, the rigidity of the frame structure is relatively weakened, so that the too large expansion force is released, the damage to the battery can be avoided, and therefore the battery module can adaptively adjust the expansion force of the battery and reduce the influence of the expansion force of the battery on the battery module.

In the assembling method of the battery module according to the present invention, the first side plate and the second side plate, which fasten the plurality of batteries in a group to complete the assembly of the battery module, are assembled by inserting the second protrusions between the first protrusions and fixing the second protrusions with the first protrusions. The assembling method is convenient and simple to operate, is beneficial to improving the production efficiency of the battery module, can reduce the possibility that a plurality of batteries are damaged (for example, collided), and improves the product quality of the battery module. In addition, the assembling method enables the battery module to adaptively adjust the battery expansion force and reduces the influence of the battery expansion force on the battery module.

Drawings

Fig. 1 is a perspective view of a battery module according to the present invention.

Fig. 2 is a perspective view of a portion a of the battery module according to fig. 1.

Fig. 3 is a plan view of the battery module according to fig. 1.

Fig. 4 is a front view of the battery module according to fig. 1.

Fig. 5 is a sectional view taken along line a-a in fig. 4.

Fig. 6 is an exploded perspective view of the battery module according to fig. 1.

Fig. 7 is a perspective view of a first side plate and a second side plate of the battery module according to fig. 1.

Fig. 8 is a partial perspective view of the first side panel according to fig. 7.

Fig. 9 is a partial perspective view of the second side plate according to fig. 7.

Fig. 10 is a partial perspective view of the first side panel of fig. 7 from another angle.

Fig. 11 is a partial perspective view of the first side panel of fig. 7 from a further angle.

Fig. 12 is a partial perspective view of the second side plate of fig. 7 viewed from another angle.

Fig. 13 is a partial perspective view of the second side plate of fig. 7 from a further angle.

Wherein the reference numerals are as follows:

m Battery Module 23 first connection

1 battery 3 second side plate

11 second body part of housing 31

111 end of large surface 31a

12 Top cover 32 second projection

13 electrode terminal 321 second extension

14 explosion-proof valve 321a end

D size 322 second folded section

2 first side plate 323 groove

21 first body portion 33 second connecting portion

21a end 4 insulating plate

22 first projection 5 cushion

221 first extension L in the longitudinal direction

221a end portion W width direction

222 height direction of the first folding section H

223 raised d overlap dimension

Detailed Description

The accompanying drawings illustrate embodiments of the present invention and it is to be understood that the disclosed embodiments are merely exemplary of the invention, which can be embodied in various forms, and therefore, specific details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present invention.

In the description of the present application, unless explicitly stated or limited otherwise, the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means more than two (including two); the term "coupled", unless otherwise specified or indicated, is to be construed broadly, e.g., "coupled" may be a fixed or removable connection or a connection that is either integral or electrical or signal; "connected" may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In the description of the present application, it should be understood that the directional terms such as "upper" and "lower" used in the embodiments of the present application are used in the angle shown in the drawings, and should not be construed as limiting the embodiments of the present application.

Hereinafter, a battery module, a battery pack, a vehicle, and an assembling method of the battery module according to the present invention will be described in detail with reference to the accompanying drawings.

The vehicle according to the present invention includes the battery pack according to the present invention and a vehicle main body. The battery pack is provided to the vehicle body. Wherein, the vehicle is new energy automobile, and it can be pure electric automobile, also can hybrid vehicle or increase form car. The vehicle main part is provided with the power supply, and the power supply is connected with the battery package electricity, and the power supply is used for the vehicle provides drive power, and the battery package configuration is for providing the electric energy to the power supply. The power source is, for example, a driving motor, and the driving motor is connected to wheels on the vehicle body through a transmission mechanism, so as to drive the vehicle to move. Preferably, the battery pack may be horizontally disposed at the bottom of the vehicle body.

The battery pack includes the battery module M according to the present invention. The battery modules M can be accommodated in the box body, the number of the battery modules M is one or more, and the plurality of battery modules M are arranged in the box body. The type of the case is not limited, and the case may be a frame-shaped case, a disc-shaped case, a box-shaped case, or the like, and specifically, the case may include a lower case that houses the battery module M and an upper case that covers the lower case.

Referring to fig. 1 to 6, a battery module M according to the present invention includes a plurality of batteries 1, a first side plate 2, and a second side plate 3. The battery module M may further include an insulation plate 4 and a buffer pad 5.

Referring to fig. 1 to 3, a plurality of batteries 1 are sequentially arranged in a longitudinal direction L. The battery 1 may be a hard-case battery (or referred to as a can-type battery) or a pouch-type battery (or referred to as a pouch-type battery). The hard-case battery includes an electrode assembly, a case 11, a top cap 12, an electrode terminal 13, an explosion-proof valve 14, a pour hole, and the like. The case 11 has an interior forming a receiving cavity to receive the electrode assembly and the electrolyte. The electrode assembly includes a positive electrode tab, a negative electrode tab, and a separator film separating the positive electrode tab and the negative electrode tab. The pouch cell includes an envelope (formed, for example, of an aluminum plastic film), an electrode assembly (similar to the construction and molding of a hard-case battery), and tabs.

As shown in fig. 1 to 5, the first side plate 2 includes a first main body portion 21 and a first protrusion 22. The second side plate 3 includes a second body portion 31 and a second protrusion 32. The first and second

main body portions

21 and 31 are located on both sides of the plurality of cells 1 in the width direction W. The first protrusion 22 is connected to an end 21a of the first body 21 in the longitudinal direction L, and the second protrusion 32 is connected to an end 31a of the second body 31 in the longitudinal direction L. The first projections 22 and the second projections 32 are located on the same side of the plurality of cells 1 in the longitudinal direction L, and at least two first projections 22 are provided. In the length direction L, the first protrusions 22 and the second protrusions 32 are alternately arranged, and in a plane perpendicular to the length direction L, a projection of the first protrusion 22 and a projection of the second protrusion 32 at least partially overlap; the first protrusion 22 farthest from the battery 1 in the longitudinal direction L is fixed to the second protrusion 32. The first protrusion 22 farthest from the battery 1 in the longitudinal direction L is welded and fixed to the second protrusion 32, and specifically, an end of the first protrusion 22 in the width direction W (in an embodiment described later, an end 221a of the first extension 221 in the width direction W) is welded and fixed to the second protrusion 32. The first body portion 21 and the first protrusion 22 of the first side plate 2 may be integrally formed, and the second body portion 31 and the second protrusion 32 of the second side plate 3 may be integrally formed.

In the battery module M according to the present invention, the first side plate 2 and the second side plate 3 constitute a frame structure that fastens a plurality of batteries 1 in a group, the first protrusions 22 of the first side plate 2 and the second protrusions 32 of the second side plate 3 are alternately arranged and inserted into each other in the length direction L, and the first protrusions 22 farthest from the batteries 1 in the length direction L are fixed to the second protrusions 32. The rigidity of the frame structure of the battery module M can be increased along with the expansion deformation of the battery 1, and the frame structure can restrict the expansion of the battery 1 in turn, so that the deformation of the battery 1 is not too large, and when the expansion force is too large, the rigidity of the frame structure is relatively weakened, so that the excessive expansion force is released, the damage to the battery 1 can be avoided, and therefore the battery module M can adaptively adjust the expansion force of the battery, and the influence of the expansion force of the battery on the battery module is reduced.

Specifically, after the assembly of the battery module M is completed, when the plurality of batteries 1 start to expand and deform, the large surface 111 of the battery 1 gradually applies an expansion force to the first protrusion 22 of the first side plate 2 and the second protrusion 32 of the second side plate 3, and the gap between the first protrusion 22 and the second protrusion 32 which are inserted into each other gradually decreases, and at this time, the expansion force is substantially a certain value, and because of the buffer effect of the gap, the expansion force is not suddenly excessive; when the battery 1 deforms to a certain degree, no gap exists between the first protrusion 22 and the second protrusion 32, the friction force between the first protrusion 22 and the second protrusion 32 is gradually increased, the rigidity of the whole battery module M is gradually enhanced, and therefore the expansion deformation of the battery 1 is limited, and at the moment, the expansion force can be rapidly increased; when the expansion force is excessively large beyond the allowable range, at this time, the force of the first protrusion 22 and the second protrusion 32 separating from each other exceeds the frictional force therebetween, the portions where the first protrusion 22 and the second protrusion 32 overlap with each other move outward in the width direction W in the direction away from each other, the rigidity of the battery module M gradually decreases, the deformation of the battery module M gradually increases, and the expansion force exceeding the allowable range portion is released, so that the battery 1 is not damaged by the excessive expansion force. In the whole process, the friction force between the first protrusion 22 and the second protrusion 32 acts as a buffer and a force distribution for the direct stress at the fixing position of the first protrusion 22 and the second protrusion 32 (if the first protrusion 22 is welded and fixed to the second protrusion 32, the fixing position is the welding seam) farthest away from the battery 1, and the frame structure formed by the first side plate 2 and the second side plate 3 does not cause the excessive expansion force of the battery 1, so that failures such as the fracture of the welding seam and the like are not caused, and the influence of the expansion force of the battery on the battery module can be reduced.

It is to be noted that, in the example shown in fig. 6 and 7, the first protrusion 22 is connected to both ends 21a of the first body 21 in the longitudinal direction L, and the second protrusion 32 is connected to both ends 31a of the second body 31 in the longitudinal direction L, so that there are two sets of the first protrusion 22 and the second protrusion 32 located on the same side of the plurality of cells 1 in the longitudinal direction L.

In some embodiments, taking a set of the first protrusion 22 and the second protrusion 32 located on the same side of the plurality of batteries 1 in the length direction L as an example, the second protrusion 32 may be provided in plurality. As shown in fig. 1, 2, and 5, the second protrusions 32 are provided in two, the first protrusions 22 are provided in three, and the second protrusions 32 are inserted between the corresponding adjacent second protrusions 32. The second protrusion 32 may be provided in one, and the first protrusion 22 may be provided in two. The number of the second protrusions 32 is not limited thereto, and the number of the first protrusions 22 is not limited thereto. As long as the first protrusions 22 and the at least two second protrusions 32 are arranged alternately and the projection of the first protrusion 22 and the projection of the second protrusion 32 at least partially overlap in a plane perpendicular to the length direction L, i.e. the first protrusion 22 and the at least two second protrusions 32 are plugged into each other. The number of the first and

second protrusions

22 and 32, the size of the gap between the first and

second protrusions

22 and 32 in the length direction L, and the overlapping dimension d of the overlapping portion of the projection of the first protrusion 22 and the projection of the second protrusion 32 in the width direction W directly affect the initial rigidity of the frame structure of the battery module M. The greater the number of first and

second projections

22, 32, the greater the initial stiffness of the frame structure; the smaller the gap between the first and

second projections

22, 32 in the length direction L, the greater the initial stiffness of the frame structure; the larger the overlapping dimension d in the width direction W of the overlapping portion of the projection of the first protrusion 22 and the projection of the second protrusion 32, the greater the initial rigidity of the frame structure. The number of the first and

second protrusions

22 and 32, the gap between the first and

second protrusions

22 and 32 in the length direction L, and the overlapping dimension d of the overlapping portion of the projection of the first protrusion 22 and the projection of the second protrusion 32 in the width direction W may be determined according to the requirements for the initial rigidity of the frame structure in particular. In a plane perpendicular to the longitudinal direction L, an overlapping dimension D of an overlapping portion of a projection of the first protrusion 22 and a projection of the second protrusion 32 in the width direction W is larger than half of a dimension D of the battery 1 in the width direction W. Since the middle region of the large surface 111 of the battery 1 is subjected to large expansion deformation, the range of the overlap dimension d ensures that the portion where the first protrusion 22 and the second protrusion 32 overlap does not come loose and separate quickly, and ensures that the rigidity of the frame structure of the battery module M is not too low to play a role in limiting the expansion of the battery.

The first projection 22 has a flat plate shape. Specifically, in some embodiments, referring to fig. 2 to 5, the first protrusion 22 has a first extending section 221 and a first folding section 222, the first extending section 221 extends along the width direction W, and the first folding section 222 folds back from an end 221a of the first extending section 221 along the width direction W and extends toward a direction close to an end 21a of the first body portion 21 along the length direction L, the structure of the first protrusion 22 can enhance the rigidity of the first protrusion 22, and a gap is formed between the first extending section 221 and the first folding section 222, which contributes to the absorption of the cell expansion force. The first projection 22 has a flat plate shape. Specifically, in some embodiments, referring to fig. 2 to 5, the second protrusion 32 has a second extending section 321 and a second folded-back section 322, the second extending section 321 extends in the width direction W, and the second folded-back section 322 is folded back from an end 321a of the second extending section 321 in the width direction W and extends toward a direction close to an end 31a of the second main body portion 31 in the length direction L, the structure of the second protrusion 32 can reinforce the rigidity of the second protrusion 32, and a gap is formed between the second extending section 321 and the second folded-back section 322, the gap facilitating absorption of the battery expansion force. Taking a set of first protrusions 22 and second protrusions 32 located on the same side of the plurality of cells 1 in the length direction L as an example, the at least two first protrusions 22 and the first body 21 may be integrally formed, and the plurality of second protrusions 32 and the second body 31 may also be integrally formed for ease of processing.

Referring to the example shown in fig. 1 and 2, a first connection portion 23 is provided on the first protrusion 22 farthest from the battery 1 in the length direction L, and a second connection portion 33 is provided on the second protrusion 32 farthest from the battery 1 in the length direction L, and the first connection portion 23 and the second connection portion 33 are used for connection with a battery pack (e.g., connection with a case of the battery pack). The first connection portion 23 may be integrally formed with the first protrusion 22, and the second connection portion 33 may be integrally formed with the second protrusion 32. In the example shown in fig. 1 and 2, the first connection portion 23 and the second connection portion 33 are hollow structures, and may be connected to the case of the battery pack by fastening connectors (e.g., bolts) penetrating the first connection portion 23 and the second connection portion 33. In addition, in the assembly process of the battery module M, after the first side plate 2 and the second side plate 3 are assembled, the first protrusion 22 farthest away from the battery 1 along the length direction L abuts against the second connecting portion 33, and the second connecting portion 33 prevents the first protrusion 22 from further moving along the width direction W, so that the second connecting portion 33 can play a role of a stopper to determine that the first side plate 2 and the second side plate 3 are assembled in place, which is helpful for accurately assembling the battery module M.

Referring to the example shown in fig. 5 and 8 to 13, the first protrusion 22 is provided with a protrusion 223, the second protrusion 32 is provided with a groove 323, and the protrusion 223 is inserted into the groove 323. The engagement of the projection 223 with the groove 323 increases the resistance against detachment between the first projection 22 and the second projection 32, and strengthens the strength of the first projection 22 and the second projection 32 themselves. The opposite arrangement is of course possible, and in other embodiments the first protrusion 22 is provided with a recess and the second protrusion 32 is provided with a projection, which is inserted into the recess.

Referring to fig. 1 and 6, the insulating plate 4 is provided between the first protrusion 22 or the second protrusion 32 and the battery 1 located at the end in the longitudinal direction L among the plurality of batteries 1. The insulating plate 4 serves as insulation between the first protrusion 22 or the second protrusion 32 and the battery 1.

Referring to fig. 1 and 6, the buffer pad 5 is disposed between the adjacent batteries 1. The cushion pad 5 serves a cushioning function.

The method for assembling a battery module according to the present invention includes: providing a plurality of batteries 1, and arranging the plurality of batteries 1 in sequence along the length direction L; providing a first side plate 2 and a second side plate 3, and placing the first side plate 2 and the second side plate 3 on two sides of the plurality of batteries 1 in the width direction W; moving the first side plate 2 in a direction to approach the plurality of batteries 1, so that the first main body 21 of the first side plate 2 is attached to the plurality of batteries 1 and the first protrusion 22 is positioned on one side of the plurality of batteries 1 in the longitudinal direction L; moving the second side plate 3 in a direction to approach the plurality of batteries 1, so that the second body part 31 of the second side plate 3 is attached to the plurality of batteries 1, and the second protrusion 32 is inserted between the first protrusions 22; the first protrusion 22 farthest from the battery 1 in the longitudinal direction L is fixed to the second protrusion 32.

In the assembling method of the battery module according to the present invention, the first side plate 2 and the second side plate 3 are assembled by inserting the second protrusions 32 between the first protrusions 22 and fixing the second protrusions 32 with the first protrusions 22, and the first side plate 2 and the second side plate 3 fasten a plurality of batteries in a group to complete the assembly of the battery module. The assembling method is convenient and simple to operate, is beneficial to improving the production efficiency of the battery module, can reduce the possibility that the plurality of batteries 1 are damaged (for example, collided), and improves the product quality of the battery module. In addition, the assembling method enables the battery module to adaptively adjust the battery expansion force and reduces the influence of the battery expansion force on the battery module.

The above detailed description describes exemplary embodiments, but is not intended to limit the combinations explicitly disclosed herein. Thus, unless otherwise specified, various features disclosed herein can be combined together to form a number of additional combinations that are not shown for the sake of brevity.

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

1. A battery module (M) is characterized by comprising a plurality of batteries (1), a first side plate (2) and a second side plate (3);

a plurality of batteries (1) are sequentially arranged along the length direction (L);

the first side plate (2) comprises a first main body part (21) and a first protrusion part (22); the second side plate (3) comprises a second main body part (31) and a second protruding part (32);

the first main body part (21) and the second main body part (31) are positioned on both sides of the plurality of batteries (1) in the width direction (W); the first protrusion (22) is connected to an end (21a) of the first body (21) in the longitudinal direction (L), and the second protrusion (32) is connected to an end (31a) of the second body (31) in the longitudinal direction (L);

the first protrusion (22) and the second protrusion (32) are located on the same side of the plurality of batteries (1) in the longitudinal direction (L);

at least two first protrusions (22); in the length direction (L), the first protrusions (22) and the second protrusions (32) are alternately arranged, and in a plane perpendicular to the length direction (L), the projection of the first protrusions (22) and the projection of the second protrusions (32) at least partially overlap;

a first protrusion (22) farthest from the battery (1) in the longitudinal direction (L) is fixed to the second protrusion (32).

2. The battery module (M) according to claim 1, wherein the second protrusion (32) is provided in plurality.

3. The battery module (M) according to claim 1, wherein the first protrusion (22) has a first extending section (221) and a first folding section (222), the first extending section (221) extends in the width direction (W), and the first folding section (222) folds back from an end (221a) of the first extending section (221) in the width direction (W) and extends toward a direction close to an end (21a) of the first body portion (21) in the length direction (L).

4. The battery module (M) according to claim 3, wherein the second protrusion (32) has a second extending section (321) and a second folded section (322), the second extending section (321) extends in the width direction (W), and the second folded section (322) is folded back from an end (321a) of the second extending section (321) in the width direction (W) and extends toward a direction close to an end (31a) of the second main body portion (31) in the length direction (L).

5. The battery module (M) according to claim 4, wherein the at least two first protrusions (22) and the first body portion (21) are integrally molded, and the plurality of second protrusions (32) and the second body portion (31) are integrally molded.

6. The battery module (M) according to claim 1, wherein the first protrusion (22) is provided with a protrusion (223), the second protrusion (32) is provided with a groove (323), and the protrusion (223) is inserted into the groove (323).

7. The battery module (M) according to claim 1, wherein the first protrusion (22) is provided with a groove, and the second protrusion (32) is provided with a protrusion, the protrusion being inserted into the groove.

8. The battery module (M) according to claim 1, wherein an overlap dimension (D) in the width direction (W) of an overlap portion of a projection of the first protrusion (22) and a projection of the second protrusion (32) in a plane perpendicular to the length direction (L) is larger than half of a dimension (D) in the width direction (W) of the battery (1).

9. The battery module (M) according to claim 1, wherein the first protrusion (22) farthest from the battery (1) in the length direction (L) is welded and fixed to the second protrusion (32).

10. The battery module (M) according to claim 1, wherein the battery module (M) further comprises an insulating plate (4), and the insulating plate (4) is provided between the first protrusion (22) or the second protrusion (32) and the battery (1) located at the end in the longitudinal direction (L) among the plurality of batteries (1).

11. A battery pack, characterized by comprising the battery module (M) according to any one of claims 1 to 10.

12. A vehicle characterized by comprising a power source and the battery pack according to claim 11;

the power source is used for providing driving force for the vehicle, and the battery pack is configured to provide electric energy for the power source.

13. An assembling method of a battery module, comprising:

providing a plurality of batteries (1), and arranging the plurality of batteries (1) in sequence along the length direction (L);

providing a first side plate (2) and a second side plate (3), and placing the first side plate (2) and the second side plate (3) at two sides of the plurality of batteries (1) along the width direction (W);

moving the first side plate (2) in a direction approaching the plurality of batteries (1), so that the first main body part (21) of the first side plate (2) is attached to the plurality of batteries (1) and the first protrusion part (22) is positioned on one side of the plurality of batteries (1) in the length direction (L);

moving the second side plate (3) in a direction approaching the plurality of batteries (1), so that the second main body part (31) of the second side plate (3) is attached to the plurality of batteries (1), and the second protruding part (32) is inserted between the first protruding parts (22);

a first protrusion (22) and a second protrusion (32) which are farthest from the battery (1) in the longitudinal direction (L) are fixed.