Battery module and battery pack

Abstract

The utility model provides a battery module and a battery pack, the battery module comprises two oppositely arranged side plates and two oppositely arranged end plates, the two end plates and the two side plates enclose to form an accommodating space, a cell stack is accommodated in the accommodating space, each side plate comprises a side plate main body and a compression-resistant assembly, and the compression-resistant assembly is arranged between the side plate main body and the compression-resistant assembly. The side plate main body is connected with the battery cell stacking body, the compression-resistant assembly is arranged on at least one end part of the side plate main body in the vertical direction, and a gap exists between the compression-resistant assembly and the battery cell stacking body. When the end part or the side direction of the module is extruded, due to the fact that the interval exists between the inner surface of the compression-resistant assembly and the battery cell stacking body, the compression-resistant assembly is firstly bent and deformed under the action of extrusion force, and the existence of the interval can provide a certain compression-resistant buffer space for the battery cell stacking body, so that the possibility of deformation of the battery cell stacking body is reduced, and the battery cell stacking body is prevented from being damaged. And therefore, the risks of cracking, liquid leakage and even explosion of the battery core stacking body are reduced, and the safety of the battery core stacking body is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery module and a battery pack. Background Art

[0002] The side plates of the existing battery module are relatively long. When the module is laterally squeezed, due to the weak stiffness and small load-bearing capacity of the side plates, the deformation of the module increases under the same extrusion force, the intrusion amount of the battery cells increases, and there is a risk of liquid leakage or fire and explosion of the battery cells. Summary of the Utility Model

[0003] In view of this, the purpose of the present utility model is to provide a battery module and a battery pack to improve the stiffness and strength of the battery cell module to withstand lateral extrusion force.

[0004] Based on the above purpose, the first aspect of the present utility model provides a battery module, including: two relatively arranged side plates and two relatively arranged end plates. The two end plates and the two side plates enclose a receiving space, and a battery cell stack is received in the receiving space. Each side plate includes a side plate main body and a compression-resistant component. The side plate main body is connected to the battery cell stack, and the compression-resistant component is arranged on at least one end of the side plate main body in the vertical direction, and there is a gap between the compression-resistant component and the battery cell stack.

[0005] Optionally, the compression-resistant component includes a first compression-resistant part, and the first compression-resistant part extends in a direction away from the battery cell stack, and the gap is formed between the first compression-resistant part and the side wall of the battery cell stack.

[0006] Optionally, the first compression-resistant part is inclined, and along the direction from the side plate main body to the first compression-resistant part, the gap gradually increases.

[0007] Optionally, the first compression-resistant part includes a horizontal compression-resistant member and a vertical compression-resistant member. The horizontal compression-resistant member is connected to the side plate main body and extends in the horizontal direction, and the vertical compression-resistant member is connected to the horizontal compression-resistant member and extends in the vertical direction, and the gap is formed between the vertical compression-resistant member and the battery cell stack.

[0008] Optionally, the first compression-resistant part is an arc-shaped structure protruding in a direction away from the battery cell stack.

[0009] Optionally, the compression-resistant component further includes a second compression-resistant part. The second compression-resistant part is connected to the first compression-resistant part and extends in a direction close to the battery cell stack. There are gaps between the second compression-resistant part and the top surface of the battery cell stack and the terminals of each battery cell of the battery cell stack.

[0010] Optionally, the compression-resistant component is disposed on the top of the side plate main body, and the side plate further includes a bent portion disposed at the bottom of the side plate main body.

[0011] Optionally, the thicknesses of both the second compression-resistant portion and the bent portion are greater than or equal to 1.5 mm; and / or the distance between the second compression-resistant portion and the battery cell stack in the vertical direction is greater than or equal to 1 mm.

[0012] Optionally, the dimension of the interval in the horizontal direction is greater than or equal to 3 mm.

[0013] A second aspect of the present application provides a battery pack, including the battery module according to any one of the first aspects above.

[0014] As can be seen from the above, for the battery module and the battery pack provided by the present utility model, the battery module includes two relatively arranged side plates, each side plate includes a side plate main body and a compression-resistant component, the compression-resistant component is disposed on at least one end of the side plate main body in the vertical direction, and there is an interval between the compression-resistant component and the battery cell stack. Thus, when the end or side of the module is squeezed, due to the interval between the inner surface of the compression-resistant component and the battery cell stack, the compression-resistant component first undergoes a bending deformation under the action of the squeezing force. The existence of the interval will provide a certain compression buffer space for the battery cell stack, reducing the possibility of deformation of the battery cell stack, and further reducing the risks of cracking, leakage, and even explosion of the battery cell stack, ensuring the safety of the battery cell stack. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0016] Figure 1 It is an exploded view of the battery module provided by the present utility model;

[0017] Figure 2 It is a side view of the first type of side plate provided by the present utility model;

[0018] Figure 3 It is a side view of the second type of side plate provided by the present utility model;

[0019] Figure 4 It is a side view of the third type of side plate provided by the present utility model;

[0020] Figure 5 It is a side view of the battery module installed with the first type of side plate provided by the present utility model;

[0021] Figure 6 A side view of the third side plate battery module provided by the present utility model.

[0022] In the figure: 1. Side plate; 11. Side plate main body; 12. Compression resistance component; 121. First compression resistance part; 1211. Horizontal compression resistance member; 1212. Vertical compression resistance member; 122. Second compression resistance part; 13. Bending part; 14. Reinforcement part; 141. Through hole; 2. Battery cell stack; 3. End plate; 31. Installation groove; 4. Adhesive; 100. Spacing; 200. Accommodation space; 300. Terminal. Detailed implementation manners

[0023] In order to make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0024] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present utility model should be the generally understood meanings by those with ordinary skills in the field to which this application belongs. The "first", "second" and similar terms used in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. The terms such as "including" or "comprising" mean that the elements or objects appearing before this term cover the elements or objects listed after this term and their equivalents, without excluding other elements or objects. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left" and "right" are only used to represent relative position relationships, and when the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0025] Currently, in order to improve the assembly efficiency of the battery module, the structural design of the side plate of the battery module is generally relatively simple. And during assembly, the inner surface of the side plate is usually adhesively bonded to the side surface of the battery cell. After the battery module is assembled, it is locked to the battery pack frame, and then adjusted or taken by the staff.

[0026] However, since the length direction of the side plate is parallel to the stacking direction of the battery cells, when the size of the battery cell stack is relatively large, the length of the side plate will be relatively long. When the module is subjected to lateral extrusion force, the overall stiffness of the side plate is weak due to its excessive length, resulting in poor load-bearing capacity, and further causing relatively large deformation of the battery module, increasing the intrusion amount of the battery cells, and even leading to risks of battery cell leakage and fire and explosion.

[0027] Based on this, it is necessary to propose a new type of battery cell module to improve the stiffness and strength of the battery cell module to withstand lateral extrusion force.

[0028] Figure 1 shows an exploded view of the battery module, see Figure 1 , this embodiment provides a battery module, including two side plates 1 arranged oppositely and two end plates 3 arranged oppositely. Among them, the two end plates 3 and the two side plates 1 enclose a receiving space 200, and a battery cell stack 2 is received in the receiving space 200; each side plate 1 includes a side plate main body 11 and a compressive component 12. The side plate main body 11 is connected to the battery cell stack 2, and the compressive component 12 is arranged on at least one end of the side plate main body 11 in the vertical direction, and there is a gap 100 between the compressive component 12 and the battery cell stack 2.

[0029] Specifically, see Figure 1 , the two end plates 3 are arranged at intervals along the width direction of the battery cell stack 2, and the two side plates 1 are arranged at intervals along the length direction of the battery cell stack 2. In this way, the two side plates 1 and the two end plates 3 can form a rectangular receiving space 200 for receiving the battery cell stack 2, so as to facilitate the assembly by the staff.

[0030] Installation grooves 31 are provided at both ends of the end plate 3, and the two installation grooves 31 correspond to and are connected to the two side plates 1 respectively. The installation groove 31 can cover the end of the side plate 1 to protect the side plate 1.

[0031] The battery module further includes an adhesive 4. Among them, the adhesive 4 is arranged between the side plate 1 and the battery cell stack 2, and the adhesive 4 bonds the battery cell stack 2 to the side plate 1 to realize the connection between the side plate main body 11 and the battery cell stack 2. Exemplarily, the adhesive 4 is made of a heat-conducting material to facilitate the conduction of the heat of the battery cell stack 2 to the side plate 1, and then facilitate heat dissipation and save manufacturing costs.

[0032] In the vertical direction, the compressive component 12 can be arranged at both the upper end and the lower end of the side plate main body 11 at the same time, or can be arranged only at the upper end or the lower end of the side plate main body 11. The setting position and the number of the compressive components 12 are not limited and are set according to actual needs.

[0033] When the battery cell module is subjected to radial or lateral extrusion, the extruded object first contacts the compressive component 12 at the top of the side plate 1, so that the compressive component 12 first undergoes a bending deformation under the action of the extrusion force. Since there is a gap 100 between the inner surface of the compressive component 12 and the battery cell stack 2, the existence of the gap 100 will provide a certain compressive buffer space for the battery cell stack 2, reduce the possibility of the battery cell stack 2 deforming, and further reduce the risks of the battery cell stack 2 cracking, leaking liquid or even exploding, ensuring the safety of the battery cell stack 2.

[0034] The gap 100 can be formed between the compression-resistant component 12 and the side wall and the top surface of the battery cell stack 2 simultaneously, so that the side wall and the top surface of the battery cell stack 2 can be compressed and buffered at the same time; the gap 100 can also be formed only between the compression-resistant component 12 and the side wall of the battery cell stack 2 to provide compression and buffering for the side wall of the battery cell stack 2.

[0035] During specific implementation, for the battery cell stack 2, when its top weld is impacted or deformed, it is very easy to crack and leak liquid. Therefore. Exemplarily, refer to Figure 1 ., the compression-resistant component 12 is arranged at the upper end of the side plate main body 11. At this time, there is a gap 100 between the compression-resistant component 12 and the top weld of the battery cell stack 2, so as to provide a certain buffer space for the top weld of the battery cell stack 2, thereby avoiding cracking at the weld and reducing the risk of liquid leakage and explosion of the battery cell stack 2, and improving the safety of the battery cell stack 2.

[0036] In addition, since the compression-resistant component 12 is arranged at at least one end of the side plate main body 11 in the vertical direction, the setting of the compression-resistant component 12 improves the stiffness of the entire side plate 1. When the battery module is subjected to lateral extrusion force or end extrusion, the strong stiffness of the side plate 1 can resist the extrusion force, reduce the magnitude of the extrusion force received by the battery cell stack 2, and reduce the possibility of deformation of the battery cell stack 2 due to extrusion, ensuring the safety of the battery cell stack 2.

[0037] Figure 2 The side view of the first side plate 1 is shown. Refer to Figure 2 ., the compression-resistant component 12 includes a first compression-resistant part 121. Among them, the first compression-resistant part 121 extends away from the battery cell stack 2, and the gap 100 is formed between the first compression-resistant part 121 and the side wall of the battery cell stack 2.

[0038] Specifically, when the battery module is subjected to a lateral extrusion force, the gap 100 between the first compression-resistant part 121 and the side wall of the battery cell stack 2 can provide a certain lateral avoidance space for the battery cell stack 2, avoid interference between the battery cell stack 2 and the side plate 1, buffer the lateral extrusion force, reduce the intensity of the force on the side wall of the battery cell and the weld of the battery cell top cover, and further reduce the risk of battery cell liquid leakage, fire and explosion. In addition, using the first compression-resistant part 121 and the battery cell stack 2 to form a gap 100 to achieve compression and buffering can improve the safety performance of the battery cell stack 2 while not increasing the volume of the battery cell module as much as possible.

[0039] In some embodiments, refer to Figure 2 ., the first compression-resistant part 121 is inclined, and along the direction from the side plate main body 11 to the first compression-resistant part 121, the gap 100 gradually increases.

[0040] Specifically, along the direction from the side plate body 11 to the first compressive part 121, the interval 100 gradually increases. Thus, the interval 100 is larger at the top of the battery cell stack 2, achieving a more favorable buffering and avoidance of the top weld of the battery cell stack 2, more effectively reducing the magnitude of the extrusion force received by the top weld, and avoiding liquid leakage of the weld due to extrusion force.

[0041] In addition, since the size of the interval 100 varies in the direction from the side plate body 11 to the first compressive part 121, thus, in the face of deformations of different degrees, the interval 100 can provide a suitable space for buffering. On the basis of providing buffering, the maximization of space utilization is ensured.

[0042] Figure 3 The side view of the second side plate 1 is shown. Refer to Figure 3 , the first compressive part 121 is an arc-shaped structure protruding in the direction away from the battery cell stack 2. The arc-shaped first compressive part 121 can provide a larger interval 100. At the same time, compared with a straight-line structure, the arc-shaped structure has better anti-bending performance and can bear a greater force.

[0043] Figure 4 The side view of the third side plate 1 is shown. Refer to Figure 4 , the first compressive part 121 includes a horizontal compressive member 1211 and a vertical compressive member 1212. The horizontal compressive member 1211 is connected to the side plate body 11 and extends in the horizontal direction. The vertical compressive member 1212 is connected to the horizontal compressive member 1211 and extends in the vertical direction. The interval 100 is formed between the vertical compressive member 1212 and the battery cell stack 2.

[0044] Specifically, the horizontal extension of the horizontal compressive member 1211 can ensure that there is a certain distance between the first compressive part 121 and the battery cell stack 2 in the horizontal direction. On this basis, the vertical compressive member 1212 extends vertically and forms an interval 100 with the battery cell stack 2. Compared with other structures, the vertical compressive member 1212 can provide sufficient compressive buffering space, further ensuring the safety of the battery cell stack 2. At the same time, the vertical structure of this embodiment is convenient for processing. That is to say, the size of the interval 100 can be adjusted only by adjusting the length of the horizontal compressive member 1211. For those skilled in the art, the implementation of this structure is relatively simple and easy to achieve.

[0045] In this embodiment, the horizontal compression members 1211 and the vertical compression members 1212 have the same length, which is convenient for ensuring the overall stability of the compression assembly 12. In other embodiments, the length of the vertical compression members 1212 can also be made less than the length of the horizontal compression members 1211, so as to minimize the overall center of gravity of the side plate 1 as much as possible and ensure that the staff can transfer it more stably during transportation. In addition, the length of the vertical compression members 1212 can also be made greater than the length of the horizontal compression members 1211, so as to provide a more ample radial buffer space for the battery cell module, thereby improving the radial compression strength of the battery cell module. Thus, during actual operation, the staff can select a suitable structure according to actual needs, which is not specifically limited herein.

[0046] Figure 5 A side view of a battery module equipped with the first side plate 1 is shown; Figure 6 A side view of a battery module equipped with the third side plate 1 is shown. Refer to Figure 5 and Figure 6 The compression assembly 12 further includes a second compression portion 122. The second compression portion 122 is connected to the first compression portion 121. The second compression portion 122 extends in a direction close to the battery cell stack 2. There are gaps between the second compression portion 122 and the top surface of the battery cell stack 2 and the terminals 300 of each battery cell in the battery cell stack 2.

[0047] Specifically, refer to Figure 5 and Figure 6 The extending direction of the second compression portion 122 is horizontal. By further providing a second compression portion 122 extending in the width direction of the battery module at the end of the first compression portion 121, the strength of the side plate 1 is further improved. At the same time, there are gaps between the second compression portion 122 and the battery cell stack 2 and the terminals 300 of each battery cell, avoiding interference between the second compression portion 122 and the battery cell stack 2 and the terminals 300 of the battery cells, resulting in damage to the battery cells. Further, the gap between the second compression portion 122 and the terminals 300 of each battery cell needs to meet the requirements of creepage distance.

[0048] In some embodiments, the second compression portion 122 can also be inclined, that is, the distance between the second compression portion 122 and the battery cell stack 2 is variable. Its advantage is that it provides sufficient avoidance and buffer space for the battery cell stack 2, ensuring the safety of the battery cell stack 2. In addition, the shape of the second compression portion 122 can also be curved, which is not specifically limited herein.

[0049] In some embodiments, continue to refer to Figure 2 、 Figure 3 and Figure 4, the side plate 1 further includes a reinforcing portion 14. Wherein, the reinforcing portion 14 is provided on the side of the side plate body 11 facing away from the battery module. When the battery module is laterally squeezed and the side plate body 11 is deformed, the arrangement of the reinforcing portion 14 can improve the strength of the side plate body 11, reduce the deformation amount of the side plate body 11 under the same squeezing force, and further reduce the possibility of the battery cell stack 2 being squeezed.

[0050] Reference Figure 5 and Figure 6 , the reinforcing portion 14 can be located in the middle part of the side plate body 11 to facilitate balancing the center of gravity position of the side plate body 11. In other embodiments, the reinforcing portion 14 can also be provided on the upper or lower part of the side plate body 11 to strengthen the stiffness of the side plate body 11 according to actual needs. The setting position of the reinforcing portion 14 is not specifically limited herein.

[0051] Further, there can be only one reinforcing portion 14, or there can be multiple reinforcing portions 14. When there are multiple reinforcing portions 14, the multiple reinforcing portions 14 are evenly arranged on the side wall of the side plate body 11 facing away from the battery module to improve the lateral stiffness of the side plate body 11.

[0052] Specifically, referring to Figure 1 , a through hole 141 is further provided on the reinforcing portion 14 for fixing the battery module in the battery pack.

[0053] Optionally, in some embodiments, referring to Figure 1 , the shape of the through hole 141 is circular, and there are several through holes 141, and the several through holes 141 are equidistantly spaced. In other embodiments, the shape of the through hole 141 can also be square, star-shaped, etc., which is not specifically limited herein.

[0054] In some embodiments, the compression-resistant component 12 is provided on the top of the side plate body 11, and the side plate 1 further includes a bending portion 13 provided at the bottom of the side plate body 11. The cooperation of the two can provide greater bending stiffness. When the battery cell stack 2 is subjected to a squeezing force, the side plate 1 as a whole will not bend and deform prematurely, effectively reducing the squeezing deformation amount of the side plate 1 and making the battery module safer.

[0055] During specific implementation, when the battery module is subjected to a lateral pressure, the squeezing object will first contact the compression-resistant component 12 located on the top of the side plate body 11. However, since there is a gap 100 between the compression-resistant component 12 and the battery cell stack 2, the weld of the battery cell will not crack. When the battery module is further subjected to a lateral squeezing force, the side plate 1 will bend. Due to the presence of the second compression-resistant portion 122 on the top of the side plate 1 and the bending portion 13 at the bottom, the side plate 1 can provide greater bending stiffness, so that under the same squeezing force, the squeezing force on the battery cell stack 2 is smaller and the squeezing deformation amount is smaller.

[0056] When the battery module is subjected to end extrusion, the first compression part 121 and the second compression part 122 at the top of the side plate 1, and the bending part 13 at the bottom of the side plate 1 can jointly provide higher stiffness, so that the side plate 1 will not buckle prematurely, further reducing the extrusion deformation amount of the battery cell stack 2 and making the battery module safer.

[0057] It should be noted that in other embodiments, the positions of the side plate 1 and the bending part 13 can also be exchanged, that is, the compression component 12 is arranged at the bottom of the side plate main body 11, and the bending part 13 is arranged at the top of the side plate main body 11. The staff can select according to actual needs and the force condition of the battery cell stack 2, and no specific limitation is made here.

[0058] Optionally, in some embodiments, as Figure 5 and Figure 6 shown, a T-shaped structure can be formed between the bending part 13 and the side plate main body 11, that is, a part of the bending part 13 extends towards the direction close to the battery cell stack 2 and is connected to the bottom of the battery cell stack 2 to support the bottom of the battery cell stack 2 and enhance the end stiffness of the side plate 1, and the other part of the bending part 13 extends away from the battery cell stack 2 to improve the lateral stiffness of the side plate 1.

[0059] In some embodiments, the bending part 13 can only extend towards the direction close to the battery cell stack 2 and be connected to the bottom of the battery cell stack 2 to support the bottom of the battery cell stack 2 and enhance the end stiffness of the side plate 1.

[0060] In some embodiments, the bending part 13 can also only extend away from the battery cell stack 2 to improve the lateral stiffness of the side plate 1.

[0061] In some embodiments, the thicknesses of both the second compression part 122 and the bending part 13 are greater than or equal to 1.5 mm, so as to ensure that the side plate 1 has a certain stiffness. Furthermore, when the battery cell stack 2 is subjected to extrusion force, the side plate 1 will not bend and deform prematurely, further ensuring the safety of the battery cell stack 2. Exemplarily, the thicknesses of the second compression part 122 and the bending part 13 can be 1.5 mm, 2.5 mm, 3.5 mm, 4.5 mm, etc., and no specific limitation is made here.

[0062] It should be noted that for the width of the bending part 13, it also needs to be adjusted according to the size of the blue film window opening area at the bottom of the battery cell. In this embodiment, the creepage distance requirement needs to be met.

[0063] In some embodiments, the distance between the second compression part 122 and the battery cell stack 2 in the vertical direction is greater than or equal to 1 mm, so as to ensure a buffer space between the second compression part 122 and the top surface of the battery cell stack 2 and the battery cell weld. That is to say, when the battery module is squeezed in the end direction, the above buffer space provides a certain avoidance for the position of the battery cell weld, effectively reducing the intrusion amount of the battery cell and the risks of battery cell leakage, fire and explosion. Exemplarily, the distance between the second compression part 122 and the battery cell stack 2 in the vertical direction can be 1.0 mm, 2.0 mm, 3.0 mm, 4.0 mm, etc., which is not specifically limited herein.

[0064] In some embodiments, the size of the spacer 100 in the horizontal direction is greater than or equal to 3 mm, so as to ensure that when the battery cell module is squeezed and the side plate 1 is bent, the spacer 100 can provide sufficient avoidance space, further ensuring the safety of the battery cell stack 2. Exemplarily, the size of the spacer 100 in the horizontal direction can be 3.0 mm, 4.0 mm, 5.0 mm, 6.0 mm, etc., which is not specifically limited herein.

[0065] Optionally, the above-mentioned side plate 1 is an integrally formed structure, which saves the production time and cost of the side plate 1. At the same time, it ensures the production accuracy of the side plate 1 and is convenient for mass production.

[0066] This application also provides a battery pack, including the battery module of any of the above embodiments. Exemplarily, the battery pack may include only one battery module, or may include a plurality of battery modules arranged in sequence. The battery pack has the technical effects of any of the above embodiments, which will not be elaborated herein.

[0067] Those of ordinary skill in the art should understand that: the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the present application is limited to these examples; under the concept of the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the present invention as described above, which are not provided in detail for the sake of brevity.

[0068] The embodiments of the present invention are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A battery module, characterized in that: include: Two side plates are arranged opposite to each other and two end plates are arranged opposite to each other. The two end plates and the two side plates together form a storage space. The storage space accommodates a battery cell stack. Each of the side plates includes a side plate body and a pressure-resistant component. The side plate body is connected to the battery cell stack. The pressure-resistant component is arranged on at least one end of the side plate body in the vertical direction. There is a gap between the pressure-resistant component and the battery cell stack.

2. The battery module according to claim 1, characterized in that: The pressure-resistant assembly includes a first pressure-resistant portion, the first pressure-resistant portion extends in a direction away from the battery cell stack, and the gap is formed between the first pressure-resistant portion and a side wall of the battery cell stack.

3. The battery module according to claim 2, characterized in that: The first anti-pressure portion is arranged obliquely, and the interval gradually increases along the direction from the side plate body to the first anti-pressure portion.

4. The battery module according to claim 2, characterized in that: The first pressure-resistant part includes a horizontal pressure-resistant part and a vertical pressure-resistant part. The horizontal pressure-resistant part is connected to the side plate body and extends in the horizontal direction. The vertical pressure-resistant part is connected to the horizontal pressure-resistant part and extends in the vertical direction. The gap is formed between the vertical pressure-resistant part and the battery cell stack.

5. The battery module according to claim 2, characterized in that: The first pressure-resistant portion is an arc-shaped structure protruding in a direction away from the battery cell stack.

6. The battery module according to any one of claims 2 to 5, characterized in that: The pressure-resistant component also includes a second pressure-resistant part, which is connected to the first pressure-resistant part and extends toward the direction close to the battery cell stack. There is a gap between the second pressure-resistant part and the top surface of the battery cell stack and the terminal of each battery cell of the battery cell stack.

7. The battery module according to claim 6, characterized in that: The pressure-resistant component is arranged on the top of the side plate body, and the side plate further comprises a bending portion, and the bending portion is arranged on the bottom of the side plate body.

8. The battery module according to claim 7, characterized in that: The thickness of the second pressure-resistant portion and the bending portion are both greater than or equal to 1.5 mm; and / or the distance between the second pressure-resistant portion and the battery cell stack in the vertical direction is greater than or equal to 1 mm.

9. The battery module according to claim 1, characterized in that: The dimension of the interval in the horizontal direction is greater than or equal to 3 mm 。 10. A battery pack, characterized in that: Comprising a battery module as described in any one of claims 1 to 9.

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