CN220856768U - Battery module and battery pack - Google Patents

Abstract

The utility model discloses a battery module, which comprises a battery box body, wherein the battery box body is provided with a bottom plate and a plurality of side plates surrounding the bottom plate, the side plates surround the bottom plate to form a containing cavity, and liquid cooling flow channels are arranged on the bottom plate and at least one side plate; the battery module is provided with a plurality of battery cells, is assembled in the accommodating cavity of the battery box body and exchanges heat with the liquid cooling runner; the box end plate is positioned in the arrangement direction of the plurality of battery monomers, is clamped between the battery module and the side plates of the battery box, and is welded with the bottom plate and/or at least one side plate. Meanwhile, the battery pack using the battery module is also disclosed, the problem that the structural strength of the existing battery pack is reduced due to the fact that the extrusion end plate is fixed in a threaded mode is solved, the integral weight of the battery pack is prevented from being increased, meanwhile, the structural strength of the battery pack is improved, and the assembly difficulty of the battery pack is reduced.

Description

Battery module and battery pack

Technical Field

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

Background

Aiming at the problems of poor heat transfer effect and poor safety performance of the existing battery pack in the battery industry that a liquid cooling plate of the existing battery pack is only arranged at the bottom or the top of the battery pack, the battery pack with an authorized bulletin number CN219106298U is disclosed in the 5 th month 30 th year 2023, the battery pack comprises a battery box body and a battery module assembled in the battery box body, the battery box body comprises a bottom plate and a plurality of side plates surrounding the bottom plate, the plurality of side plates surround the bottom plate to form a containing cavity, and the battery module is positioned in the containing cavity; wherein, all be provided with the liquid cooling runner on bottom plate and the at least curb plate, and the liquid cooling runner on the bottom plate communicates with the liquid cooling runner on the curb plate. Thus, the cooling system for the battery pack in the related art is improved in the technical problem of poor cooling effect.

Because be provided with the liquid cooling runner on the bottom plate and the curb plate of this battery package, and extrusion end plate 42 adopts bolted connection mode to be fixed in on the battery box in this battery package, direct shaping screw hole promptly on the battery box, the structural strength who holds chamber shaping threaded hole position tends to lead to reduces, when this battery package runs into impact or collision, takes place to damage in the weaker position of structural strength easily and leads to the inside coolant liquid of liquid cooling runner to get into and hold the chamber, causes the risk of the short circuit of battery package. The increased thickness dimension of the bottom plate at the position where the pressing end plate 42 is installed promotes a drastic increase in the overall weight of the battery pack, which is not advantageous for the lightweight design of the battery pack.

Disclosure of utility model

In order to overcome at least one defect in the prior art, the utility model provides a battery module and a battery pack, which solve the problem of reduced structural strength caused by the adoption of a threaded fixing mode of an extrusion end plate in the conventional battery pack, avoid the increase of the whole weight of the battery pack, improve the structural strength of the battery pack and reduce the assembly difficulty of the battery pack.

The utility model adopts the technical proposal for solving the problems that:

A battery module, comprising:

The battery box body is provided with a bottom plate and a plurality of side plates surrounding the bottom plate, wherein the side plates surround the bottom plate to form a containing cavity, and liquid cooling flow channels are arranged on the bottom plate and at least one side plate;

The battery module is provided with a plurality of battery cells, is assembled in the accommodating cavity of the battery box body and exchanges heat with the liquid cooling runner;

the box end plate is positioned in the arrangement direction of the battery cells, and is clamped between the battery module and the side plates of the battery box, and the bottom plate and/or at least one side plate is/are welded with the box end plate.

In some embodiments of the present utility model, the case end plate includes a first stress portion, a second stress portion, and two support deformation portions, where the first stress portion, the second stress portion, and the two support deformation portions enclose a forming deformation buffer cavity, the first stress portion abuts against the battery module, and the second stress portion abuts against a side plate of the battery case.

In some embodiments of the present utility model, a deformation buffer gap is provided between the side plate near the side of the support deformation portion and the support deformation portion.

In some embodiments of the utility model, an end plate insulator is disposed between the first stress portion and the battery module.

In some embodiments of the present utility model, the first force receiving portion, the second force receiving portion, and the two support deformation portions are integrally formed.

In some embodiments of the utility model, a deformation buffer is disposed between two adjacent battery cells.

In some embodiments of the present utility model, the battery box further has a liquid inlet and a liquid outlet, and both the liquid inlet and the liquid outlet are communicated with the liquid cooling flow channel.

In some embodiments of the utility model, the liquid inlet and the liquid outlet are disposed on opposite sides of the liquid cooling channel. Or the liquid inlet and the liquid outlet are both positioned on the same side of the liquid cooling runner.

In some embodiments of the present utility model, the liquid cooling channels include a plurality of bottom liquid cooling channels disposed on the bottom plate, and a plurality of side liquid cooling channels disposed on the side plates, each of the bottom liquid cooling channels and each of the side liquid cooling channels extending along an arrangement direction of the plurality of battery cells.

The utility model also discloses a battery pack, which comprises a plurality of the battery modules, wherein the battery modules of the battery modules are connected in series and parallel, and the liquid cooling flow channels of the battery modules are communicated.

In summary, the battery module and the battery pack provided by the utility model have the following technical effects:

According to the utility model, the box end plate is fixed on the battery box in a welding connection mode, so that punching is not required on the battery box, the problem of reduced structural strength caused by the fact that the extrusion end plate in the existing battery pack is in a threaded fixing mode is solved, the thickness of the battery box is not required to be increased to ensure the structural strength of the battery box, and the box end plate is not required to be reinforced by structures such as an end plate locking screw rod, a steel belt, a module interlocking steel sheet and the like, so that the overall weight of the battery module is greatly reduced, the purpose of light-weight design is achieved, meanwhile, the assembly process is simplified, and the overall efficiency of assembly is facilitated.

Drawings

Fig. 1 is an overall structure view of a battery module according to the present utility model;

fig. 2 is a schematic front view of a battery module according to the present utility model;

FIG. 3 is an enlarged partial schematic view of FIG. 2A;

FIG. 4 is a schematic diagram of the assembly of a battery case and case end plates according to the present utility model;

FIG. 5 is a schematic diagram of the distribution of the liquid cooling channels and heat exchange medium according to the present utility model.

Icon: the battery pack comprises a 1-battery box body, a 11-bottom plate, a 111-bottom heat exchange cavity, a 112-bottom diversion body, a 12-side plate, a 121-side stress plate, a 122-side heat exchange plate, a 123-side heat exchange cavity, a 124-side diversion body, a 13-containing cavity, a 14-liquid cooling runner, a 141-bottom liquid cooling runner, a 142-side liquid cooling runner, a 15-liquid inlet, a 16-liquid outlet, a 2-battery module, a 21-deformation buffer piece, a 22-battery cell, a 3-box end plate, a 31-first stress part, a 32-second stress part, a 33-supporting deformation part, a 34-deformation buffer cavity, a 4-deformation buffer gap and a 5-end plate insulator.

Detailed Description

For a better understanding and implementation, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model.

In the description of the present utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.

Referring to fig. 1, fig. 2 and fig. 4, the present utility model discloses a battery module, which includes:

The battery box 1, the battery box 1 has a bottom plate 11 and a plurality of side plates 12 surrounding the bottom plate 11, the plurality of side plates 12 form a containing cavity 13 around the bottom plate 11, and the bottom plate 11 and at least one side plate 12 are provided with liquid cooling flow channels 14;

The battery module 2 is provided with a plurality of battery cells 22, and the battery module 2 is assembled in the accommodating cavity 13 of the battery box body 1 and exchanges heat with the liquid cooling flow channel 14;

The box end plate 3, the box end plate 3 is located in the arrangement direction of the plurality of battery cells 22, and is clamped between the battery module 2 and the side plates 12 of the battery box 1, and the bottom plate 11 and/or at least one side plate 12 is welded with the box end plate 3.

In this embodiment, when the battery module 2 releases heat and generates expansion deformation, the heat released by the battery module 2 enters the liquid cooling flow channel 14 through the cavity wall of the accommodating cavity 13, wherein the liquid cooling flow channel 14 is filled with heat exchange medium, the heat is absorbed by the heat exchange medium and then is transported to the outside of the battery module along the liquid cooling flow channel 14, and the expansion deformation generated by the battery module 2 acts on the box end plate 3 along the arrangement direction of the plurality of battery cells 22 of the battery module 2, that is, when each battery cell 22 of the battery module 2 is in expansion deformation, the plurality of battery cells 22 accumulate the expansion deformation to be extruded on the box end plate 3, and the box end plate 3 is stressed and deformed to absorb the expansion deformation generated by the battery module 2.

Wherein, because box end plate 3 is fixed in battery box 1 through the welding mode, be fixed in battery box 1 with the mode that adopts the material adding promptly with box end plate 3 on, this not only makes box end plate 3's fixed more firm, so, also avoid box end plate 3 bolt to become flexible and lead to battery module 2 to be difficult to accuse pretightning force at the in-process of equipment assembly, simultaneously, also guarantee that battery module can effectively guarantee the compactness of assembly between battery module 2, box end plate 3 and the battery box 1 in the use.

In addition, the box end plate 3 is welded with the bottom plate 11 and/or at least one side plate 12 of the battery box 1, and the battery box 1 is not required to be drilled in advance, so that the problem that hole sites are difficult to align due to assembly tolerance or machining errors in the assembly process is avoided, and meanwhile, structures such as an end plate locking screw, a steel belt and a module interlocking steel sheet are omitted, so that the battery module is more convenient and efficient to assemble.

More importantly, the problem of structural strength reduction at the position of the hole site is also avoided, and conversely, the structural strength of the whole battery module can be improved to a greater extent by utilizing a welding process. It should be noted that, the strength of the welding seam is improved, the stability and the safety of the whole welding structure are ensured, and the assembly personnel can also perfect by optimizing the welding condition, selecting proper welding materials, performing proper post-treatment and the like.

Further, the above-mentioned case end plate 3 may be an existing extrusion end plate, and in addition, the inventor provides a case end plate 3, and specifically please refer to fig. 2, 3 and 4, the case end plate 3 includes a first stress portion 31, a second stress portion 32 and two support deformation portions 33, the first stress portion 31, the second stress portion 32 and the two support deformation portions 33 enclose a forming deformation buffer cavity 34, the first stress portion 31 abuts against the battery module 2, and the second stress portion 32 abuts against the side plate 12 of the battery case 1.

Preferably, the first stress portion 31, the second stress portion 32 are integrally formed with two support deformation portions 33, for example: the injection molding process is used to mold the case end plate 3, the bending process is used in combination with the welding process to mold the case end plate 3, etc., and the case end plate 3 may be molded by not being limited to the above-described process but being a process. The first stress portion 31, the second stress portion 32 and the two supporting deformation portions 33 are surrounded and formed into a shape like a Chinese character 'hui' or a shape like a Chinese character 'hui', wherein the first stress portion 31 and the second stress portion 32 are preferably arranged oppositely, and the two supporting deformation portions 33 are preferably arranged oppositely, so that when the first stress portion 31 receives expansion deformation of the battery module 2, the first stress portion 31 can deform towards the inside of the accommodating cavity 13, and when the expansion deformation amount of the battery module 2 is large, the two supporting deformation portions 33 can deform towards the inside of the accommodating cavity 13. In this way, the deformation buffer chamber 34 provides a sufficient deformation space, so that the expansion deformation generated by the battery module 2 can be absorbed more effectively.

Unexpectedly, compared with the existing extrusion end plate, the box end plate 3 has no criss-cross reinforcing rib structure and no structure of the material reduction groove, is simpler in structure and convenient to design and produce, so that the production cost can be reduced very well, the material of the box end plate 3 can be reduced effectively, the weight of the box end plate 3 and the battery module is reduced, and the lightweight design of the battery pack is facilitated.

It should be noted that, in the cross section of the case end plate 3, the support deformation portion 33 may extend linearly from the first stress portion 31 toward the second stress portion 32, or may extend in an arc shape from the first stress portion 31 toward the second stress portion 32.

As a further preferable mode of this embodiment, specifically referring to fig. 2 and 3, a deformation buffer gap 4 is provided between the side plate 12 near the support deformation portion 33 and the support deformation portion 33. Preferably, a deformation buffer gap 4 is provided between each of the two opposite side supporting deformation parts 33 of the first stress part 31 and the corresponding side plate 12, or a deformation buffer gap 4 may be provided between one side supporting deformation part 33 of the first stress part 31 and the side plate 12.

On the one hand, when the first stress portion 31 receives the extrusion effort of the battery module 2, the supporting deformation portion 33 may further deform toward the deformation buffer gap 4 side, so that the deformation space of the first stress portion 31 is further improved through the cooperation between the case end plate 3 and the battery case 1, and thus the expansion performance generated by the battery module 2 is better absorbed.

On the other hand, the welding position between the case end plate 3 and the battery case 1 can be located inside the deformation buffer gap 4, so that the problem that the battery module 2 is damaged or short-circuited due to the fact that substances such as slag remain at the contact position between the battery module 2 and the case end plate 3 can be avoided, and the use safety of the battery module is improved.

It should be noted that the size of the deformation buffer gap 4 may be set according to structural design and assembly requirements, and the deformation buffer gap 4 is not limited herein.

In order to ensure the structural strength of the box end plate 3, the box end plate 3 can be made of metal materials. In order to prevent the battery module 2 from being damaged during expansion or worn during assembly, and thus from leaking electricity, or even causing a short circuit to fire.

In view of the above problems and risks, the inventors have also provided a preferred manner, specifically please refer to fig. 2 and 3, in which an end plate insulator 5 is disposed between the first stress portion 31 and the battery module 2. Here end plate insulator 5 adopts the material that possesses comparatively good insulating property and comparatively good elasticity ability, then under the effect of end plate insulator 5, not only avoid carrying out direct contact between first atress portion 31 and the battery module 2, also avoid remaining the material such as slag to wearing and tearing or damaging battery module 2 in the electric welding process to guarantee effectively that possess good insulating property between battery module 2 and the box end plate 3, thereby guarantee the security and the stability of this battery module in the use.

It should be noted that the end plate 3 is not limited to a metal material, and the end plate 3 may be made of a non-metal material according to design requirements and stress analysis.

It should also be noted that, the battery module is preferably configured with two box end plates 3, the two box end plates 3 are disposed on two opposite sides of the battery module 2, and each box end plate 3 is welded and fixed with the battery box 1, so that in the process of expanding and deforming along the arrangement direction of the plurality of battery cells 22, both ends of the battery module 2 act on the box end plates 3, which not only further improves the absorbing capacity of expanding and deforming the battery module 2, but also, more importantly, avoids the risk that one end of the battery module 2 is in rigid contact with the battery box 1, resulting in damage to the battery module 2 in the process of expanding and deforming, thereby further improving the use stability and safety of the battery module.

Optionally, a module insulating member is further disposed between the battery module 2 and the side plate 12 of the battery box 1, which is not shown in the figure, and the module insulating member has good insulation, such as a PC material, so as to effectively prevent the problem of short circuit caused by breakage of the blue film on the battery module 2 during assembly or use, thereby improving the use stability and safety of the battery module.

Referring to fig. 1, 2 and 4, the battery case 1 further has a liquid inlet 15 and a liquid outlet 16, and both the liquid inlet 15 and the liquid outlet 16 are connected to the liquid cooling channel 14. Through inlet 15 and liquid outlet 16, so, will be able to last steadily to the liquid cooling runner 14 of battery box 1 carry heat transfer medium for heat transfer medium can carry out the heat exchange with battery module 2, thereby can guarantee that battery module 2 is in the preferred temperature range, and then make this battery module possess better performance.

It should be noted that, as shown in fig. 1 and 4, the liquid inlet 15 and the liquid outlet 16 are preferably disposed on the bottom plate 11 of the battery case 1, and the liquid inlet 15 and the liquid outlet 16 may also be disposed on the side plate 12 of the battery case 1.

As a preferred mode of this embodiment, specifically, as shown in fig. 2, a deformation buffer 21 is disposed between two adjacent battery cells 22. The deformation buffer 21 is made of foam material, silica gel material, aerogel material, etc., that is, the deformation buffer 21 has good deformation capability and insulation performance.

In this way, by using the deformation buffer 21, not only can good insulation be ensured between two adjacent battery cells 22, thereby improving the safety of the battery module 2 and the battery module. Meanwhile, the expansion deformation of two adjacent battery cells 22 can be absorbed very effectively by utilizing the elastic deformation capacity of the deformation buffer member 21, so that the effect of self-regulation of the expansion deformation of the battery module 2 in the use process is realized. In general, the deformation buffer 21 is formed as a sheet with a relatively thin thickness, and the deformation buffer 21 is made of foam, aerogel or the like, so that the deformation buffer 21 has a relatively light overall weight, thereby making the battery module relatively light overall weight, and facilitating the realization of the lightweight design of the battery module and the battery pack thereof.

Preferably, as shown in fig. 5, the gray arrow in fig. 5 indicates the flow direction of the heat exchange medium having a lower temperature just inputted from the liquid inlet 15, and the black arrow indicates the flow direction of the heat exchange medium having a higher temperature flowing to the liquid outlet 16. Among the plurality of side plates 12, the side plate 12 located in the arrangement direction of the plurality of battery cells 22 is a side force-receiving plate 121, and then the side plate 12 located between the two side force-receiving plates 121 and at one side of the battery module 2 is a side heat-exchanging plate 122, the two side force-receiving plates 121 are fixedly connected with each side heat-exchanging plate 122, the second force-receiving portion 32 of the box end plate 3 is abutted against the side force-receiving plate 121 acting on the side plate 12, each side heat-exchanging plate 122 is provided with the liquid cooling flow channel 14, so that each battery cell 22 of the battery module 2 can exchange heat with the bottom plate 11 and the two side heat-exchanging plates 122, thereby forming the effect of three-side heat exchange of the battery cell 22.

The side heat exchange plate 122 is provided with a side heat exchange cavity 123 inside, at least one side drainage body 124 is provided inside the side heat exchange cavity 123, each side drainage body 124 extends from the side of the liquid inlet 15 toward the side of the liquid outlet 16, and then the side heat exchange cavity 123 is separated into a plurality of side liquid channels 142 by the at least one side drainage body 124, so as to achieve the purpose of providing a plurality of side liquid channels 142 on the side plate 12.

It should be noted that, as shown in fig. 3, the welding is performed in the region where the support deformation portion 33 of the case end plate 3 meets the side force receiving plate 121 of the side plate 12, at this time, the purpose that the welding position between the case end plate 3 and the battery case 1 is located inside the deformation buffer gap 4 is achieved, or the welding may be performed between the support deformation portion 33 of the case end plate 3 and the bottom plate of the battery case 1, and at the same time, the welding position is located inside the deformation buffer gap 4.

In addition, a bottom heat exchange cavity 111 is disposed in the bottom plate 11, at least one bottom drainage body 112 is disposed in the bottom heat exchange cavity 111, each bottom drainage body 112 extends from a side of the liquid inlet 15 toward a side of the liquid outlet 16, and the bottom heat exchange cavity 111 is separated into a plurality of bottom liquid channels 141 by at least one bottom drainage body 112, so as to achieve the purpose of disposing a plurality of bottom liquid channels 141 on the bottom plate 11.

Therefore, the liquid cooling channel 14 includes a plurality of bottom liquid cooling channels 141 disposed on the bottom plate 11 and a plurality of side liquid cooling channels 142 disposed on the side plate 12, and the heat exchange medium flows from one end of the liquid inlet 15 to the liquid outlet 16 along the bottom liquid cooling channels 141 and the side liquid cooling channels 142, that is, each bottom liquid cooling channel 141 and each side liquid cooling channel 142 extends along the arrangement direction of the plurality of battery cells 22, the flow path of the heat exchange medium passes through each battery cell 22 of the battery module 2, so that the battery cells 22 can exchange heat with the heat exchange medium.

It should be noted that the heat exchange medium is also called a heat transfer medium, and is a compound with thermal stability and chemical stability and is used for connecting heat transfer media such as heating or heat removal, and the heat exchange medium can be selected from water and glycol mixed solution, refrigerant, cooling oil, special cooling liquid, and the like.

It should be noted that the side guide 124 and the bottom guide 112 are preferably linear, and of course, the side guide 124 and the bottom guide 112 may also be wavy or curved.

As a preferred mode of this embodiment, referring to fig. 2 and 5, the liquid inlet 15 and the liquid outlet 16 are disposed on opposite sides of the liquid cooling channel 14. In this way, the flow path of the heat exchange medium can pass through each battery cell 22 of the battery module 2, so that the battery cells 22 can exchange heat with the heat exchange medium.

As another preferable mode of this embodiment, the liquid inlet 15 and the liquid outlet 16 may be located on the same side of the liquid cooling channel 14. In this way, through the cooperation between the side drainage body 124 and the cavity wall of the side heat exchange cavity 123, the side liquid cooling channels 142 are formed into curved channels with reciprocating roundabout, so that the heat exchange time between the heat exchange medium and the battery module 2 is increased, and the utilization rate of the heat exchange medium is greatly improved. Similarly, by matching the bottom drainage body 112 with the cavity wall of the bottom heat exchange cavity 111, the plurality of bottom liquid channels 141 are formed into curved channels with reciprocating roundabout, so that the heat exchange time between the heat exchange medium and the battery module 2 is increased, and the utilization rate of the heat exchange medium is greatly improved.

Based on the structure and connection relationship of the battery modules, the inventor also discloses a battery pack, which comprises the battery modules, wherein the battery modules 2 of a plurality of battery modules are connected in series and parallel, and the liquid cooling runners 14 of a plurality of battery modules are communicated.

That is, the battery modules can be used as a single battery unit, and the battery pack can flexibly adjust the number of the battery modules according to design requirements (such as capacitance, output power, etc.). When a certain battery module in the battery pack fails, the battery module can be independently disassembled, replaced and maintained. In this way, the efficiency of service and maintenance is faster and, since no replacement of other intact battery modules is required, the maintenance costs of the battery pack will also be greatly reduced.

Specifically, as shown in fig. 1, 2 and 4, the bottom plate 11 of the battery case 1 of each battery module is provided with a fastening through hole, where the fastening through hole may be a threaded hole, a through hole, or another type of hole. The number of the fastening through holes is preferably configured to be four, and the four fastening through holes are uniformly distributed at four corners of the bottom plate 11. The battery pack further includes a battery main case, and each battery module can be mounted inside the battery main case by a fastener.

The technical means disclosed by the scheme of the utility model is not limited to the technical means disclosed by the embodiment, and also comprises the technical scheme formed by any combination of the technical features. It should be noted that modifications and adaptations to the utility model may occur to one skilled in the art without departing from the principles of the present utility model and are intended to be within the scope of the present utility model.

Claims (10)

1. A battery module, comprising:

the battery box body (1), the battery box body (1) is provided with a bottom plate (11) and a plurality of side plates (12) surrounding the bottom plate (11), the side plates (12) surround the bottom plate (11) to form a containing cavity (13), and liquid cooling flow channels (14) are arranged on the bottom plate (11) and at least one side plate (12);

The battery module (2) is provided with a plurality of battery cells (22), and the battery module (2) is assembled in the accommodating cavity (13) of the battery box body (1) and exchanges heat with the liquid cooling flow channel (14);

The battery box comprises a box body end plate (3), wherein the box body end plate (3) is positioned in the arrangement direction of a plurality of battery cells (22) and is clamped between the battery module (2) and a side plate (12) of the battery box body (1), and the bottom plate (11) and/or at least one side plate (12) is/are welded with the box body end plate (3).

2. The battery module of claim 1, wherein: the box end plate (3) comprises a first stress part (31), a second stress part (32) and two supporting deformation parts (33), wherein the first stress part (31), the second stress part (32) and the two supporting deformation parts (33) enclose a forming deformation buffer cavity (34), the first stress part (31) is abutted to the battery module (2), and the second stress part (32) is abutted to the side plate (12) of the battery box (1).

3. The battery module of claim 2, wherein: a deformation buffer gap (4) is arranged between the side plate (12) close to one side of the support deformation part (33) and the support deformation part (33).

4. The battery module of claim 2, wherein: an end plate insulator (5) is arranged between the first stress part (31) and the battery module (2).

5. The battery module of claim 2, wherein: the first stress part (31), the second stress part (32) and the two supporting deformation parts (33) are integrally formed.

6. The battery module according to any one of claims 1 to 5, wherein: a deformation buffer member (21) is arranged between two adjacent battery monomers (22).

7. The battery module according to any one of claims 1 to 5, wherein: the battery box body (1) is also provided with a liquid inlet (15) and a liquid outlet (16), and the liquid inlet (15) and the liquid outlet (16) are communicated with the liquid cooling runner (14).

8. The battery module of claim 7, wherein: the liquid inlet (15) and the liquid outlet (16) are respectively arranged at two opposite sides of the liquid cooling runner (14); or the liquid inlet (15) and the liquid outlet (16) are both positioned on the same side of the liquid cooling runner (14).

9. The battery module of claim 7, wherein: the liquid cooling flow channels (14) comprise a plurality of bottom liquid cooling channels (141) arranged on the bottom plate (11) and a plurality of side liquid cooling channels (142) arranged on the side plates (12), and each bottom liquid cooling channel (141) and each side liquid cooling channel (142) extend along the arrangement direction of the plurality of battery monomers (22).

10. A battery pack, characterized in that: a battery module comprising a plurality of battery modules according to any one of claims 1 to 9, wherein the battery modules (2) of the plurality of battery modules are connected in series and parallel, and the liquid cooling flow channels (14) of the plurality of battery modules are communicated.