Battery pack

Abstract

The utility model provides a battery pack. The battery pack comprises a box body, a plurality of battery modules and a filling piece, wherein the box body comprises a plurality of side walls; each battery module comprises a plurality of battery cells arranged along a first direction, and a plurality of battery modules are arranged along a second direction; the filling piece comprises a first sub-part and a second sub-part, the first sub-part is arranged between the battery module and the second side wall, the second sub-part is arranged between two adjacent battery modules, and the elastic modulus of the filling piece is smaller than that of the battery cell. In the embodiment of the invention, the filling piece is arranged between the battery modules arranged along the second direction, and when the battery pack is under the working conditions of vibration, impact and the like, as the elastic modulus of the filling piece is smaller than that of the battery core, the filling piece is easier to be stressed and deformed relative to the battery core, so that the impact force on the battery core is reduced, and the battery pack is more compact. And the technical problems of insufficient safety and stability of the battery pack under the working conditions of vibration, impact and the like are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery pack. BACKGROUND

[0002] The current requirements for battery pack grouping efficiency and energy density are increasingly high, and the grouping method of the battery pack is gradually developing from the original CTM (Cell to Module) technology to the CTP (Cell To Pack) technology. The CTM technology refers to grouping the battery cells into a module, and the module is fixed to the box or structural member to form the battery pack. The CTP technology refers to directly fixing the battery cells to the box through the structural member to form the battery pack.

[0003] The safety and stability of the battery pack using the CTP technology are insufficient under the working conditions of vibration, impact, etc. In the related technology, a pressing strip is additionally arranged on the top of the battery cell, and the pressing strip and the bottom wall of the box are used to fix the battery cell. However, the connection between the pressing strip and the battery cell is rigid, and when the battery pack is under the working conditions of vibration, impact, etc., the internal welding point stress of the battery cell will increase and be damaged under the pressure of the pressing strip.

[0004] Therefore, it is urgent to solve the above technical problems. CONTENT OF THE INVENTION

[0005] Embodiments of the present application provide a battery pack, which can improve the technical problem of insufficient safety and stability of the battery pack using the CTP technology under the working conditions of vibration, impact, etc.

[0006] Embodiments of the present application provide a battery pack, which comprises:

[0007] A box, comprising a plurality of side walls, and the plurality of side walls form an accommodating space;

[0008] A plurality of battery modules arranged in the accommodating space, wherein one battery module comprises a plurality of battery cells arranged along a first direction, and the plurality of battery modules are arranged along a second direction.

[0009] A filler comprising a first sub-part and a second sub-part, wherein the first sub-part is arranged between the battery module and the second side wall, the second sub-part is arranged between two adjacent battery modules, and the elastic modulus of the filler is less than the elastic modulus of the battery cell.

[0010] In some embodiments, the filler is arranged in contact with the battery cell, and the height of the filler is less than or equal to the height of the battery cell.

[0011] In some embodiments, the ratio of the height of the filler to the height of the battery cell is 10% to 90%.

[0012] In some embodiments, the thickness of the second sub-part is less than or equal to the thickness of the first sub-part.

[0013] In some embodiments, the battery module comprises a first structural member arranged between two adjacent battery cells, and the elastic modulus of the first structural member is less than the elastic modulus of the filler.

[0014] In some embodiments, the first structural member comprises two first sub-members arranged along the second direction, and the two first sub-members are respectively arranged corresponding to an edge region of the battery cell, and the size of the first sub-member in the height direction of the battery pack is greater than or equal to the height of the second sub-part and less than or equal to the height of the battery cell.

[0015] In some embodiments, the first structural member comprises two second sub-members arranged along the height direction of the battery pack, and the two second sub-members are respectively arranged corresponding to an edge region of the battery cell, and the two ends of the second sub-member abut against the first sub-member.

[0016] In some embodiments, the elastic modulus of the first sub-member is greater than or equal to the elastic modulus of the second sub-member.

[0017] In some embodiments, the battery pack comprises an end plate arranged on the surface of the two ends of the battery module in the first direction, and a second structural member is arranged between the end plate and the battery module, and the elastic modulus of the second structural member is less than the elastic modulus of the filler.

[0018] In some embodiments, the battery pack comprises a cover, and the cover is combined with the box body, and a gap is arranged between the cover and the side surface of the battery module close to the cover.

[0019] The beneficial effects of the embodiments of the present application are as follows:

[0020] In the embodiments of the present application, by arranging the filler between the battery modules arranged along the second direction, when the battery pack is in the working conditions of vibration, impact, etc., since the elastic modulus of the filler is less than the elastic modulus of the battery cell, the filler is more easily deformed under force relative to the battery cell, thereby reducing the impact force received by the battery cell, and improving the technical problem of insufficient safety and stability of the battery pack in the working conditions of vibration, impact, etc. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0022] Figure 1 is a perspective view of a battery pack provided by an embodiment of the present application;

[0023] Figure 2 is Figure 1 is a disassembled structural schematic view of the battery pack in

[0024] Figure 3 is Figure 1 is a top view of a partial structure of the battery pack in

[0025] Figure 4 is Figure 3 is a sectional structural schematic view of a B-B section in

[0026] Figure 5 is Figure 3 is a sectional structural schematic view of a C-C section in

[0027] Figure 6 is Figure 5 is an enlarged structural schematic view of a dashed line marked area in

[0028] Explanation of Reference Signs:

[0029] Battery pack 1;

[0030] Box 10, first side wall 11, second side wall 12;

[0031] Battery module 20, battery cell 21, first structural member 22, first sub-member 221, second sub-member 222;

[0032] Filling member 30, first sub-portion 31, second sub-portion 32;

[0033] End plate 40, second structural member 41;

[0034] Box cover 50;

[0035] Height h1 of filling member 30, height h2 of battery cell 21, thickness s1 of first sub-portion 31, thickness s2 of second sub-portion 32;

[0036] First direction D1, second direction D2. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts are within the scope of the present application. In addition, it should be understood that the specific implementation described herein is only used to illustrate and explain the present application, and is not used to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower of the device in the actual use or working state, and specifically refer to the direction of the drawing surface in the drawings; and "inner" and "outer" refer to the contour of the device.

[0038] The embodiments of the present application provide a battery pack 1, as shown in the drawings, the battery pack 1 comprises a box body 10, a plurality of battery modules 20 and a filler 30, the box body 10 comprises a plurality of side walls, the plurality of side walls are connected to form an accommodation space; the plurality of battery modules 20 are arranged in the accommodation space, one battery module 20 comprises a plurality of battery cells 21 arranged along a first direction D1, the plurality of battery modules 20 are arranged along a second direction D2; the filler 30 comprises a first sub-portion 31 and a second sub-portion 32, the first sub-portion 31 is arranged between the battery module 20 and a second side wall 12, the second sub-portion 32 is arranged between two battery modules 20 adjacent along the second direction D2, and the elastic modulus of the filler 30 is less than the elastic modulus of the battery cell 21. Figures 1 to 3 The box body 10 comprises a plurality of side walls, and the plurality of side walls are connected to form an accommodation space. The shape of the box body 10 can be set as required, and the number of the side walls can also be set as required.

[0039] In some embodiments, the box body 10 comprises two first side walls 11 arranged opposite along the first direction D1 and two second side walls 12 arranged opposite along the second direction D2, two ends of the first side wall 11 are connected with one second side wall 12 respectively, and two ends of the second side wall 12 are connected with one first side wall 11 respectively, and the plurality of side walls are connected to form the accommodation space.

[0040] In some embodiments, the included angle between the first direction D1 and the second direction D2 is an acute angle or a right angle. The included angle between the first direction D1 and the second direction D2 is a right angle in the drawings of the present application, but should not be understood as a limitation of the present application.

[0041] It should be noted that the first side wall 11 can be arranged inside the battery pack 1, that is, the first side wall 11 and the side wall of the battery pack 1 can be different side walls. As shown in the drawings, a first side wall 11 and the side wall of the battery pack 1 are spaced apart to form an accommodation space, which can be used to arrange a battery management system (BMS) and the like.

[0042] Figure 2 It should be noted that the first side wall 11 can be arranged inside the battery pack 1, that is, the first side wall 11 and the side wall of the battery pack 1 can be different side walls. As shown in the drawings, a first side wall 11 and the side wall of the battery pack 1 are spaced apart to form an accommodation space, which can be used to arrange a battery management system (BMS) and the like.​

[0043] The box body 10 further comprises a bottom, a plurality of side walls are arranged at the periphery of the edge of the bottom, and the bottom and the plurality of side walls form a box-shaped structure. The battery module 20 is arranged in the box body 10.

[0044] It should be noted that the number of battery modules 20 can be set as needed. When the number of battery modules 20 is small, the battery modules 20 can be arranged only along the second direction D2; when the number of battery modules 20 is large, the battery modules 20 can be arranged along the first direction D1 and along the second direction D2 at the same time. When the battery modules 20 are arranged along the first direction D1 and along the second direction D2 at the same time, an intermediate beam can be arranged between two adjacent battery modules 20 arranged along the first direction D1, and an intermediate beam can be arranged between two adjacent battery modules 20 arranged along the second direction D2. The two intermediate beams in different directions intersect to form a cross shape. Figure 2 and Figure 3 As shown in the drawings, two intermediate beams in a cross shape are shown, and the intermediate beams are used to separate two adjacent battery modules 20 and increase the overall strength of the battery pack.

[0045] As shown in the drawings, Figure 2 and Figure 3 The battery module 20 comprises a plurality of battery cells 21 arranged along the first direction D1. The battery cell 21 can be a square battery cell 21 or a cylindrical battery cell 21, which is not limited here.

[0046] In some embodiments, as shown in the drawings, Figure 2 and Figure 3 The battery cell 21 comprises a shell and a cover plate, the shell is arranged in contact with the bottom, and the cover plate is located on the side of the shell away from the bottom. The material of the shell can be metal, such as aluminum, but is not limited thereto.

[0047] In the embodiments of the present application, as shown in the drawings, Figure 2 and Figure 3 The battery pack 1 adopts CTP technology, a filler 30 is arranged between two adjacent battery modules 20, and the battery module 20 is directly fixed to the box body 10 through the filler 30. The filler 30 is arranged between two adjacent battery modules 20 along the second direction D2, the filler 30 and the second side wall 12 realize the pre-tightening of the battery module 20, prevent the battery cell 21 from shaking, and improve the safety and stability of the battery pack 1.

[0048] The elastic modulus of the filling piece 30 is less than that of the battery cell 21. The shell of the battery cell 21 is usually made of metal material and is relatively hard, and the elastic modulus of the battery cell 21 is relatively high. When the battery cell 21 is impacted by external force, stress is easily generated inside the shell, which causes damage to the shell. The elastic modulus of the filling piece 30 is relatively small. When the filling piece 30 is impacted by external force, the filling piece 30 is easily deformed under stress, which plays a buffering role and reduces the impact on the battery cell 21, thereby reducing the risk of damage to the battery cell 21. The elastic modulus refers to the ratio of stress to strain of a material under stress. Under the same stress, the greater the elastic modulus of the material, the less likely it is to deform; the smaller the elastic modulus of the material, the more likely it is to deform.

[0049] The material of the filling piece 30 can be a glue material, such as foaming glue, pouring glue, etc., but is not limited thereto. The material of the filling piece 30 can be selected according to the space to be filled.

[0050] As shown in Figure 2 and Figure 3 , the first sub-part 31 is arranged between the battery module 20 and the side wall, and the second sub-part 32 is arranged between two adjacent battery modules 20 along the second direction D2. The first sub-part 31 and the second sub-part 32 can bond and fix the plurality of battery modules 20 and the second side wall 12 in the box body 10. Through the above arrangement, the battery cell 21 and the box body 10 can become an integral whole, which increases the stability and reliability of the system.

[0051] The materials of the first sub-part 31 and the second sub-part 32 can be the same, so that the same process is adopted to form them, thereby simplifying the manufacturing process of the battery pack 1.

[0052] As shown in Figure 2 and Figure 3 , the size of the first sub-part 31 in the first direction D1 is greater than or equal to the size of the battery module 20 in the first direction D1, so that the length of the first sub-part 31 in the first direction D1 covers the entire battery module 20 as much as possible.

[0053] In some embodiments, as shown in Figure 3 and Figure 5 , the filling piece 30 is arranged in contact with the battery cell 21, and the height h1 of the filling piece 30 is less than or equal to the height h2 of the battery cell 21.

[0054] In this application, the height refers to the direction perpendicular to the first direction D1 and the second direction D2 at the same time, and the height direction is also perpendicular to the direction of the bearing surface of the box bottom.

[0055] As shown in Figure 5As shown, the lower surface of the filler 30 can be at the same level as the lower surface of the battery cell 21, that is, the lower surface of the filler 30 can be in contact with the bottom of the box, and the lower surface of the battery cell 21 is also in contact with the bottom of the box. The height h1 of the filler 30 is less than the height h2 of the battery cell 21, so as to avoid the filler 30 overflowing to the upper surface of the battery cell 21 and affecting the closing of the box 10 and the cover 50.

[0056] In some embodiments, the ratio of the height h1 of the filler 30 to the height h2 of the battery cell 21 is 10% to 90%. Through the above setting, the height h1 of the filler 30 can be at least 10% lower than the height h2 of the battery cell 21, further reducing the risk of the filler 30 overflowing to the upper surface of the battery cell 21.

[0057] In some embodiments, as shown, Figure 5 The thickness s2 of the second sub-portion 32 is less than or equal to the thickness s1 of the first sub-portion 31. The thickness s2 of the second sub-portion 32 refers to the dimension in the direction in which the minimum dimension of the second sub-portion 32 is located. As shown, Figure 3 and Figure 5 The thickness s2 of the second sub-portion 32 is the dimension of the second sub-portion 32 in the second direction D2, and the thickness s1 of the first sub-portion 31 is the dimension of the first sub-portion 31 in the second direction D2. By setting the second sub-portion 32 to be less than or equal to the thickness s1 of the first sub-portion 31, the pitch of the two adjacent battery cell 21 modules in the second direction D2 can be reduced, and the energy density of the battery pack 1 can be increased. While the thickness s1 of the first sub-portion 31 is greater than the thickness s2 of the second sub-portion 32, the fixing between the second side wall 12 and the battery module 20 can be more secure.

[0058] In some embodiments, as shown, Figures 3 to 5 The battery module 20 includes a first structural member 22 arranged between two adjacent battery cells 21, and the elastic modulus of the first structural member 22 is less than the elastic modulus of the filler 30.

[0059] The first structural member 22 is arranged between two adjacent battery cells 21 along the first direction D1. On the one hand, the first structural member 22 can provide a pre-tightening force in the first direction D1 for the battery module 20. On the other hand, the elastic modulus of the first structural member 22 is less than the elastic modulus of the filler 30, and the first structural member 22 is more susceptible to deformation relative to the battery cell 21, thereby reducing the impact force on the battery cell 21 in the first direction D1, and further improving the safety and stability of the battery pack 1 under vibration, impact and other working conditions.

[0060] The material of the first structural member 22 is different from the material of the filler 30. For example, the first structural member 22 can be a material such as foam that has a cushioning capability. The first structural member is more susceptible to deformation relative to the filler 30.

[0061] It should be noted that the battery cell 21 will expand after being used for a certain period of time, and the battery cell 21 can have different expansion amounts in different directions. For example, taking a square battery cell 21 as an example, two of the side walls of the square battery cell 21 have a larger area than the other two, and for ease of description, the two surfaces of the square battery cell 21 with the larger area are referred to as large end surfaces, and the two surfaces of the square battery cell 21 with the smaller area are referred to as small end surfaces. The battery cell 21 has a larger expansion amount in a direction perpendicular to the large end surfaces, and therefore, a material with a smaller elastic modulus can be arranged between the large end surfaces of two adjacent battery cells 21 to absorb the deformation of the battery cell 21 due to expansion during the life cycle, thereby improving the problem of stress concentration of the battery cell 21 due to its own expansion.

[0062] Please refer to Figure 2 In this application, the large end surfaces of the battery cell 21 are perpendicular to the first direction D1, and the small end surfaces of the battery cell 21 are perpendicular to the second direction D2. The first structural member 22 is arranged between two adjacent battery cells 21 along the first direction D1, and the elastic modulus of the first structural member 22 is smaller than the elastic modulus of the filler 30, so that the deformation of the battery cell 21 due to expansion can be better absorbed.

[0063] As Figures 5 to 6 shown, in order to avoid interference between two first structural members 22 adjacent along the second direction D2, the first structural member 22 can be arranged not to exceed the large end surface of the battery cell 21.

[0064] In some embodiments, as Figure 5 and Figure 6 shown, the first structural member 22 includes two first sub-members 221 arranged along the second direction D2, and the two first sub-members 221 are respectively arranged corresponding to an edge region of the battery cell 21, and the size of the first sub-member 221 in the height direction of the battery pack 1 is greater than or equal to the height of the second sub-member 32 and less than or equal to the height h2 of the battery cell 21.

[0065] As Figure 6 shown, the two first sub-members 221 can be respectively arranged corresponding to the left side edge and the right side edge of the large end surface of the battery cell 21. The size of the first sub-member 221 in the height direction of the battery pack 1 is less than or equal to the height h2 of the battery cell 21, so as to avoid the first sub-member 221 exceeding the large end surface of the battery cell 21 in the height direction of the battery pack 1. The size of the first sub-member 221 in the second direction D2 is less than the size of the battery cell 21 in the second direction D2, and the two adjacent first sub-members 221 are arranged with a spacing, so that the first sub-member 221 does not exceed the large end surface of the battery cell 21 in the second direction D2. Through the above arrangement, the orthographic projection of the first sub-member 221 on the large end surface of the battery cell 21 can be located on the large end surface of the battery cell 21, that is, the first sub-member 221 does not exceed the large end surface of the battery cell 21.

[0066] Optionally, such as Figure 6 As shown, in some embodiments, the first sub-component 221 has a dimension in the height direction of the battery pack 1 that is greater than or equal to the height of the second sub-component 32, so that the first sub-component 221 can block the filler 30 and prevent the filler 30 from overflowing from the left and right sides of the cell 21 into the large end face of two adjacent cells 21 during the potting process.

[0067] Furthermore, such as Figure 6 As shown, the end of the first sub-component 221 near the bottom of the casing is close to the bottom surface of the battery cell 21, thereby reducing the risk of the filler 30 overflowing from the gap between the first sub-component 221 and the bottom surface of the battery cell 21 into the large end face of the battery cell 21. For example, the distance between the lower end of the first sub-component 221 and the lower surface of the battery cell 21 can be smaller than the distance between the upper end of the first sub-component 221 and the upper surface of the battery cell 21.

[0068] In some embodiments, such as Figure 6 As shown, the first structural component 22 includes two second sub-components 222 arranged along the height direction of the battery pack 1. The two second sub-components 222 are respectively disposed corresponding to an edge region of the battery cell 21, and the two ends of the second sub-components 222 abut against the first sub-components 221.

[0069] like Figure 6 As shown, two second sub-components 222 are respectively disposed on the upper and lower edges of the large end face of the cell 21. In the second direction D2, the size of the second sub-component 222 is smaller than the size of the cell 21; in the height direction of the battery pack 1, the size of the second sub-component 222 is smaller than the height h2 of the cell 21, and the two second sub-components 222 are spaced apart in the height direction of the battery pack 1. The second sub-components 222 can prevent the filler 30 from overflowing from the upper and lower sides of the cell 21 to the large end face of the cell 21.

[0070] Optionally, both ends of the second sub-component 222 abut against the first sub-component 221. Specifically, the left end of the second sub-component 222 abuts against the first sub-component 221 located on the left edge, and the right end of the second sub-component 222 abuts against the first sub-component 221 located on the right edge. With the above arrangement, the first sub-component 221 and the second sub-component 222 can form an approximately closed frame structure, further reducing the risk of the filler 30 overflowing onto the large end face of the cell 21.

[0071] It should be noted that in the battery pack 1, both the first sub-component 221 and the second sub-component 222 are in a compressed state, and the thickness of the first sub-component 221 after compression is the same as the thickness of the second sub-component 222. Both the first sub-component 221 and the second sub-component 222 can be used to provide pre-tightening force to achieve pre-tightening fixation of the battery cell 21 in the first direction D1.

[0072] In some embodiments, the first sub-member 221 has an elastic modulus greater than or equal to the elastic modulus of the second sub-member 222.

[0073] Optionally, the first sub-member 221 and the second sub-member 222 are both made of foam, but the first sub-member 221 and the second sub-member 222 have different expansion ratios of the foam, so that the first sub-member 221 and the second sub-member 222 have different elastic moduli. The first sub-member 221 has a smaller expansion ratio of the foam than the second sub-member 222. For example, the first sub-member 221 can be made of 5 times expanded foam, and the second sub-member 222 can be made of 10 to 20 times expanded foam.

[0074] In some embodiments, as shown in Figure 4 The battery pack 1 includes an end plate 40 arranged on the surface of the battery module 20 at opposite ends in the first direction D1, and a second structural member 41 is arranged between the end plate 40 and the battery module 20, and the elastic modulus of the second structural member 41 is less than the elastic modulus of the filler 30.

[0075] The material of the second structural member 41 can be foam, and the expansion ratio of the foam can be set as needed. For example, the foam of the second structural member 41 can have the same expansion ratio as the foam of the first sub-member 221. The second structural member 41 can further achieve pre-tightening fixation of the battery cells 21 in the first direction D1.

[0076] The end plate 40 is used to enhance structural stability, improve safety, and optimize thermal management. The end plate 40 can be made of high-strength materials such as metal or composite materials. These materials have good mechanical strength and impact resistance. When the battery module 20 is subjected to external impact or vibration, the end plate 40 can provide additional protection to prevent the battery cells 21 from being pressed against each other or damaged, thereby reducing the risk of short circuit, thermal runaway, and other safety risks of the battery cells 21.

[0077] In some embodiments, as shown in Figure 1 and Figure 2 The battery pack 1 includes a cover 50 that covers the box 10, and a gap is arranged between the cover 50 and the side surface of the battery module 20 close to the cover 50.

[0078] The cover 50 covers the side wall of the box 10. Since the battery module 20 is pre-tightened in the first direction D1 and the second direction D2 by the filler 30 and the first structural member 22, the cover plate and the upper surface of the battery module 20 can be arranged at intervals, i.e., the side surface of the cover 50 close to the box 10 is arranged at an interval from the side surface of the battery module 20 close to the cover 50. Through the above arrangement, the cover 50 can prevent the battery cells 21 from being pressed in the height direction of the battery pack 1, causing damage to the battery cells 21.

[0079] The above has carried out the detailed introduction to the embodiment of the application, the principle and implementation mode of the application are described by applying specific examples in this paper, the above embodiment is only used to help understanding the method of the application and its core idea; at the same time, for the person skilled in the art, according to the idea of the application, the specific implementation mode and application range will have changes, and the above, the content of the specification should not be understood as the limitation of the application.

Claims

1. A battery pack (1), characterized in that, include: The box (10) includes multiple side walls, which together form an accommodating space; Multiple battery modules (20) are disposed within the accommodating space. One of the battery modules (20) includes multiple battery cells (21) arranged along a first direction (D1), and the multiple battery modules (20) are arranged along a second direction (D2). The filler (30) includes a first sub-part (31) and a second sub-part (32). The first sub-part (31) is disposed between the battery module (20) and the side wall, and the second sub-part (32) is disposed between two adjacent battery modules (20). The elastic modulus of the filler (30) is less than that of the cell (21).

2. The battery pack (1) according to claim 1, characterized in that, The filler (30) is disposed in contact with the battery cell (21), and the height (h1) of the filler (30) is less than or equal to the height (h2) of the battery cell (21).

3. The battery pack (1) according to claim 2, characterized in that, The ratio of the height (h1) of the filler (30) to the height (h2) of the cell (21) is 10% to 90%.

4. The battery pack (1) according to claim 1, characterized in that, The thickness (s2) of the second sub-part (32) is less than or equal to the thickness (s1) of the first sub-part (31).

5. The battery pack (1) according to any one of claims 1 to 4, characterized in that, The battery module (20) includes a first structural member (22) disposed between two adjacent battery cells (21), the elastic modulus of the first structural member (22) being less than the elastic modulus of the filler (30).

6. The battery pack (1) according to claim 5, characterized in that, The first structural member (22) includes two first sub-members (221) arranged along the second direction (D2). The two first sub-members (221) are respectively disposed corresponding to an edge region of the battery cell (21), and the dimension of the first sub-member (221) in the height direction of the battery pack (1) is greater than or equal to the height of the second sub-part (32) and less than or equal to the height (h2) of the battery cell (21).

7. The battery pack (1) according to claim 6, characterized in that, The first structural member (22) includes two second sub-members (222) arranged along the height direction of the battery pack (1). The two second sub-members (222) are respectively disposed corresponding to an edge region of the battery cell (21), and the two ends of the second sub-members (222) abut against the first sub-member (221).

8. The battery pack (1) according to claim 7, characterized in that, The elastic modulus of the first sub-component (221) is greater than or equal to the elastic modulus of the second sub-component (222).

9. The battery pack (1) according to any one of claims 1 to 4 or any one of claims 6 to 8, characterized in that, The battery pack (1) includes an end plate (40), which is disposed on the surfaces of the battery module (20) at opposite ends along the first direction (D1). A second structural member (41) is disposed between the end plate (40) and the battery module (20), and the elastic modulus of the second structural member (41) is less than the elastic modulus of the filler (30).

10. The battery pack (1) according to any one of claims 1 to 4 or any one of claims 6 to 8, characterized in that, The battery pack (1) includes a cover (50) that covers the housing (10), and a gap is provided between the cover (50) and the side surface of the battery module (20) near the cover (50).

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