End plate structure, end plate assembly, battery pack and automobile

Abstract

The utility model provides an end plate structure, end plate subassembly, battery pack and car, the end plate structure is used for setting up between battery module and battery pack box, the end plate structure includes first surface and second surface that sets up oppositely, one of first surface and second surface sets up towards the inner wall of said box, the other one of the first surface and the second surface is arranged towards the battery cell at the end part in the battery module; a first side protruding structure is arranged on the first surface, and a second side concave structure is formed in the position, corresponding to the first side protruding structure, of the second surface. Compared with a traditional end plate, the end plate structure can better absorb the expansion force of the battery cell in the battery module, and the safety of the battery cell is improved.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts technology, specifically to an end plate structure, an end plate assembly, a battery pack, and an automobile. Background Technology

[0002] Battery pack housings typically have multiple module cavities for arranging battery modules. To prevent the outermost cells of the battery modules from directly contacting the battery pack housing, such as... Figure 1 As shown, an end plate is typically placed between the battery cell 21 at the very end of the battery module 2 and the casing 3 to achieve insulation between the cell and the casing 3. Secondly, the end plate is generally made of plastic, which can absorb the expansion force in the thickness direction of the cell within the module to a certain extent, improving cell safety. However, as... Figure 1 As shown, the existing end plate 01 is generally a simple flat plate structure, which has limited effect on absorbing the expansion force of the battery cell 21 in the battery module 2. Utility Model Content

[0003] The present invention aims to improve the absorption effect of the end plate on the expansion force of the battery cell.

[0004] To solve the above problems, this utility model provides an end plate structure for being disposed between the battery module and the battery pack housing. The end plate structure includes a first surface and a second surface disposed opposite to each other. The first surface is provided with a first side protrusion structure, and the second surface is provided with a second side recess structure at a position corresponding to the first side protrusion structure.

[0005] The end plate structure provided by this utility model is disposed between the battery cell at the far end of the battery module and the casing. For example, the first surface of the end plate structure faces the casing, and the second surface faces the battery cell. The first protruding structure on the first surface of the end plate structure can contact the inner wall of the casing, while the second surface of the end plate structure partially contacts the battery cell. Since the first protruding structure on the first surface simultaneously forms a corresponding recessed structure on the second surface, meaning the first protruding structure is essentially a hollow protrusion, the second recessed structure is formed simultaneously by stamping from the second surface towards the first surface. This results in an end plate structure with an uneven surface and a relatively uniform thickness at different locations. Consequently, when the first and second surfaces are subjected to pressure, the end plate structure is more prone to stretching and deformation. Furthermore, when the cell expands, the expansion force of the cell can be transmitted to the end plate structure, which can cause the non-flat end plate structure to extend to a certain extent. During the extension of the end plate structure, it can better absorb the expansion force of the cell in the battery module and improve the cell safety.

[0006] Furthermore, the plurality of first side protrusions are distributed sequentially along the first direction, or the plurality of first side protrusions are arrayed in two dimensions.

[0007] Furthermore, the first surface is also provided with a first side recessed structure, and the second surface has a second side protrusion structure formed at the position corresponding to the first side recessed structure.

[0008] Furthermore, a plurality of first side recessed structures and a plurality of first side protruding structures are alternately distributed along the first direction; or, a plurality of first protruding structures and a plurality of first recessed structures are arrayed in two dimensions, and each first protruding structure is staggered with the adjacent first recessed structure in the two dimensions.

[0009] Furthermore, adjacent first side protrusions and first side recesses are connected to form a wave-like undulation; and / or, adjacent second side protrusions and second side recesses are connected to form a wave-like undulation on the second surface.

[0010] Furthermore, the end plate structure has a cavity inside.

[0011] This utility model also provides an end plate assembly, including the end plate structure and substrate as described above, wherein the substrate is disposed on the side of the end plate structure facing the battery module.

[0012] Compared to the battery pack casing, the cell casing is far more fragile. Therefore, this invention provides an end plate assembly. This end plate assembly is positioned between the casing and the cell at the very end of the battery module. Specifically, the substrate in the end plate assembly faces the cell; that is, the substrate is located between the end plate structure and the cell. This increases the force-bearing area between the cell and the end plate structure, allowing for more even distribution of the cell's expansion force to the end plate structure, resulting in better absorption of the expansion force. Furthermore, due to the presence of the substrate, the cell at the very end will not be damaged by excessively concentrated reaction forces from the end plate structure. Instead, the substrate can more evenly distribute the reaction forces from the end plate structure to the cell at the very end, further improving cell safety.

[0013] Furthermore, the end plate assembly also includes a connecting plate, the periphery of the substrate is provided with a flange, the periphery of the end plate structure is provided with the connecting plate, the connecting plate and the first flange at least partially overlap and are connected and fixed, and the second side protrusion structure of the end plate structure is spaced apart from the substrate.

[0014] This utility model also provides a battery pack, including a housing and an end plate structure or an end plate assembly as described above.

[0015] Since the technical improvements and effects of the battery pack are the same as those of the end plate structure or end plate assembly, the battery pack will not be described in detail again.

[0016] This utility model also provides an automobile, including the battery pack as described above.

[0017] Since the technological improvements and effects of the vehicle are the same as those of the battery pack, the vehicle will not be described in detail again. Attached Figure Description

[0018] Figure 1 A schematic diagram of an existing end plate positioned between the battery module and the housing;

[0019] Figure 2 This is a schematic diagram of the first end plate structure according to an embodiment of the present utility model from a first surface view.

[0020] Figure 3 This is a schematic diagram of the first end plate structure according to an embodiment of the present invention from a second surface perspective;

[0021] Figure 4 This is a front view of the first end plate structure according to an embodiment of the present utility model, below the first surface;

[0022] Figure 5 for Figure 4 Sectional views along the AA, BB, and CC directions;

[0023] Figure 6 This is a schematic diagram of the second end plate structure according to an embodiment of the present utility model from the perspective of the first surface;

[0024] Figure 7 This is a top view of the second end plate structure according to an embodiment of the present utility model;

[0025] Figure 8 This is a schematic diagram of the end plate assembly according to an embodiment of the present utility model;

[0026] Figure 9 for Figure 8 A schematic diagram of the exploded structure;

[0027] Figure 10 This is a front view of the end plate assembly on the first surface according to an embodiment of the present invention;

[0028] Figure 11 for Figure 10 Sectional views along the DD and EE directions;

[0029] Figure 12 This is a schematic diagram of the end plate assembly disposed between the battery module and the housing according to an embodiment of the present utility model.

[0030] Figure 13 A schematic diagram of the second type of end plate structure of this utility model embodiment, which is disposed between the battery module and the housing;

[0031] Figure 14 This is a schematic diagram showing the cell expansion force in a battery module when the battery pack uses existing end plates and when it uses the end plate structure or end plate assembly of this utility model.

[0032] Explanation of reference numerals in the attached figures:

[0033] 01. Existing end plate; 1. End plate structure; 11. First surface; 111. First side protruding structure; 112. First side recessed structure; 12. Second surface; 121. Second side recessed structure; 122. Second side protruding structure; 13. Cavity; 14. Support plate rib; 2. Battery module; 21. Battery cell; 3. Housing; 4. Base plate; 41. Flanged edge; 5. Connecting plate. Detailed Implementation

[0034] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0035] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0036] Furthermore, in the attached diagram, the X-axis represents the vertical direction, with the positive direction of the X-axis indicating forward and the negative direction indicating backward; the Y-axis represents the horizontal direction, with the positive direction of the Y-axis indicating left and the negative direction indicating right; and the Z-axis represents the vertical direction, that is, the up-down direction, with the positive direction of the Z-axis indicating up and the negative direction indicating down.

[0037] It should also be noted that the aforementioned X-axis, Y-axis and Z-axis are only for the purpose of facilitating the description of this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0038] See Figure 2-7 and Figure 13An end plate structure 1 according to an embodiment of the present utility model is used to be disposed between the battery module 2 and the housing 3 of the battery pack. The end plate structure 1 includes a first surface 11 and a second surface 12 disposed opposite to each other. The first surface 11 is provided with a first side protrusion structure 111, and the second surface 12 is provided with a second side recess structure 121 at the position corresponding to the first side protrusion structure 111.

[0039] In this embodiment, after the end plate structure 1 is disposed between the end cell 21 at the far end of the battery module 2 and the housing 3, the end plate structure 1 has, for example, a first surface 11 facing the housing 3 and a second surface 12 facing the cell 21. Furthermore, the first side protrusion 111 of the first surface 11 of the end plate structure 1 can contact the inner wall of the housing 3, while the second surface 12 of the end plate structure 1 partially contacts the cell 21. Because the first surface 11 forms a first side protrusion 111 while simultaneously forming a second side recess 121 at the corresponding position on the second surface 12, the first side protrusion 111 is essentially a hollow protrusion. For example, while the first side protrusion 111 is formed by pressing from the second surface 12 towards the first surface 11, the second side recess 121 is also formed. Ultimately, the end plate structure 1 not only has an uneven surface, but also has a thickness that is basically the same at different positions. That is, the entire end plate structure 1 is a non-flat structure with local bending deformation. Thus, when the first surface 11 and the second surface 12 are subjected to pressure, the end plate structure 1 is more likely to undergo elongation deformation. Furthermore, when the cell 21 expands, the expansion force of the cell 21 can be transmitted to the end plate structure 1, thereby causing the non-flat end plate structure 1 to elongate to a certain extent. During the elongation process, the end plate structure 1 can better absorb the expansion force of the cell 21 in the battery module 2, improving the safety of the cell 21.

[0040] In this invention, the shape and size of the protruding structure are not limited; it can be a frustum-shaped protruding structure, a long strip-shaped protruding structure, or even a protruding structure of other shapes and sizes. For ease of understanding, this invention is illustrated with two end plate structures 1 in conjunction with the accompanying drawings. The first end plate structure 1 is as follows... Figure 2-5 The second type of end plate structure 1 is as shown in Figure 1. Figure 6-7 The end plate structure 1 is shown.

[0041] Preferably, regardless of the type of protrusion structure, the highest point of the first-side protrusion structure 111 in the protrusion direction is a planar portion (parallel to the XZ plane) to make surface-to-surface contact with the inner wall of the housing 3, rather than point-to-surface or line-to-surface contact. This serves two purposes: first, it prevents the end plate structure 1 from damaging the inner wall of the housing 3 under stress (although the hardness of the housing 3 is much greater than the hardness of the cell 21's shell), and it also prevents the first-side protrusion structure 111 from scratching the inner wall of the housing 3 or the operator when the end plate structure 1 is installed between the battery module 2 and the inner wall of the housing 3; second, it ensures that after the first-side protrusion structure 111 of the end plate structure 1 makes surface-to-surface contact with the inner wall of the housing 3, the subsequent end plate structure 1, after absorbing the expansion force of the cell 21, can more easily extend on the XZ plane.

[0042] Optionally, a plurality of the first side protrusions 111 are distributed sequentially along a first direction, or a plurality of the first side protrusions 111 are arrayed in two dimensions.

[0043] In this embodiment, the plurality of first side protrusions 111 can be distributed along one dimension, see [reference]. Figure 6-7 The second type of end plate structure shown is distributed sequentially along the first direction (X-axis direction in the figure). In this way, the contact area between the end plate structure 1 and the inner wall of the housing 3 can be increased by multiple first side protrusions 111 in the first direction. This can ensure the stability of the end plate structure 1 and ensure that the end plate structure 1 can extend along the first direction at different positions when absorbing expansion force. Compared with a single first side protrusion 111, the effect of absorbing the expansion force of the battery cell 21 is better.

[0044] In this embodiment, see Figure 6-7 In the second type of end plate structure 1, the first side protrusion structure 111 can be a long strip protrusion structure, that is, the first side protrusion structure 111 extends to both ends of the end plate structure 1 along the second direction. At this time, such a long strip first side protrusion structure 111 can be distributed sequentially along the first direction. In this way, the multiple long strip first side protrusion structures 111 can further increase the contact area between the end plate structure 1 and the inner wall of the housing 3, and facilitate the overall extension of the end plate structure 1 along the X direction to absorb the expansion force of the battery cell 21.

[0045] In this embodiment, the multiple first side protrusion structures 111 can be arrayed in two dimensions, see [reference]. Figure 2-5The first endplate structure 1 shown can have a first side protrusion 111 that is a frustum-shaped protrusion. Its dimension in the first direction is smaller than that of the endplate structure 1 in the first direction, and its dimension in the second direction (Z-axis direction in the figure) is also smaller than that of the endplate structure 1 in the second direction. Thus, the frustum-shaped first side protrusions 111 can be arranged sequentially not only in the first direction but also in the second direction, equivalent to multiple frustum-shaped first side protrusions 111 being arrayed in two dimensions, i.e., multiple first side protrusions 111 are distributed in a rectangular array. Therefore, the first endplate structure 1 has a certain degree of extension not only in the first direction but also in the second direction. Furthermore, the first endplate structure 1 can be arranged either parallel to the front-rear direction of the vehicle in the first direction or parallel to the front-rear direction of the vehicle in the second direction, depending on the size of the battery pack and cell 21, making it more versatile.

[0046] Optionally, the first direction and the second direction are the length direction and the width direction of the end plate structure, respectively.

[0047] Optionally, the first surface 11 is further provided with a first side recess structure 112, and the second surface 12 is provided with a second side protrusion structure 122 at the position corresponding to the first side recess structure 112.

[0048] In this embodiment, see Figure 2-5 For example, in the aforementioned first type of end plate structure 1, the first surface 11 is provided with not only a first side protrusion structure 111, but also a first side recess structure 112. Similar to the first side protrusion structure 111, while the first side recess structure 112 is provided on the first surface 11, a second side protrusion structure 122 is formed at the corresponding position on the second surface 12. That is to say, the second side protrusion structure 122 is also equivalent to a hollow protrusion structure. For example, while the second side protrusion structure 122 is formed by stamping from the first surface 11 to the second surface 12, the first side recess structure 112 is also formed. When both the first side protrusion structure 111 and the second side protrusion structure 122 exist, the degree of deformation of the end plate structure 1 in the expansion direction of the cell 21 (that is, the Y-axis direction) can be higher. Correspondingly, the end plate structure 1 can absorb more expansion force to achieve a greater degree of extension.

[0049] It is understandable that, regardless of whether it is the first type of end plate structure 1 or the second type of end plate structure 1, and regardless of whether it is the first side protrusion structure 111 or the second side protrusion structure 122, the "hardness" of the end plate structure 1 in the Y-axis direction can be adjusted by the protrusion height of these protrusion structures. The lower the hardness, the easier it is for the end plate structure 1 to absorb the expansion force and collapse in the Y-axis direction. The collapse of the end plate structure 1 after absorbing the expansion force in the Y-axis direction also indicates the extension of the end plate structure 1 in the XZ plane.

[0050] Optionally, a plurality of first side recessed structures 112 are alternately distributed along a first direction, or a plurality of first protruding structures 111 and a plurality of first recessed structures 112 are arrayed in two dimensions, and each first protruding structure 111 and the adjacent first recessed structure 112 are staggered in two dimensions.

[0051] In this embodiment, multiple first-side recessed structures 112 and multiple first-side protruding structures 111 are alternately distributed along the first direction, which is equivalent to multiple second-side protruding structures 122 and multiple second-side recessed structures 121 being alternately distributed along the first direction. At this time, both the first-side recessed structures 112 and the first-side protruding structures 111 can be elongated. The alternating distribution of multiple first-side recessed structures 112 and multiple first-side protruding structures 111 along the first direction can further enhance the extension and deformation of the end plate structure 1 along the first direction, which is beneficial for absorbing expansion forces.

[0052] In this embodiment, similar to the first side protrusion structure 111, the second side protrusion structure 122 can also be a frustum-shaped protrusion structure. Its dimension in the first direction is smaller than that of the end plate structure 1 in the first direction, and its dimension in the second direction is also smaller than that of the end plate structure 1 in the second direction. Thus, the frustum-shaped second side protrusion structures 122 can be arranged sequentially in the first direction or sequentially in the second direction, that is, they can be arranged in a rectangular array to further improve the ability of the first end plate structure 1 to collapse in the Y-axis direction at different positions and absorb the expansion force of the cell 21. When multiple first-side protrusions 111 are arrayed in two dimensions, the multiple first-side protrusions 111 are also arrayed in two dimensions. In this case, each first-side protrusion 111 is staggered from its adjacent first-side recess 112 in the two dimensions; or, each first-side recess 112 is staggered from its adjacent first-side protrusion 111 in the two dimensions. That is, the first-side recess 112 and its adjacent first-side protrusion 111 are neither aligned in the first direction nor in the second direction. Thus, with a given size for the first-side protrusions 111, adjacent first-side protrusions 111 can be positioned closer together, achieving a smooth transition between adjacent first-side protrusions 111, and simultaneously achieving a smooth transition between the first-side protrusions 111 and the first-side recess 112. This not only facilitates the stamping of the first end plate structure 1 but also ensures that the end plate structure 1 has sufficient capacity to absorb the expansion force of the battery cell 21.

[0053] Optionally, adjacent first side protrusions 111 are connected to first side recesses 112 in a wave-like undulation; and / or, adjacent second side protrusions 122 are connected to second side recesses 121 to make the second surface wave-like undulation.

[0054] In this embodiment, as Figure 2-5 As shown, the first side protrusion 111 and its adjacent first side recess are connected to form a wave-like undulation. There is no planar portion between the first side protrusion 111 and the adjacent first side recess 112; they are smoothly transitioned by an arc surface. While ensuring that the forming of the first side protrusion 111 and the first side recess 112 does not interfere with each other, the first side protrusion 111 and the first side recess 112 can fully utilize the surface area of ​​the end plate structure to distribute more first side protrusions 111 and first side recesses 112, improving the ductility of the end plate structure. Simultaneously, the wave-like undulation surface is more prone to deformation and can absorb more expansion force. Similarly, the adjacent second side protrusion 122 is connected to the second side recess 121 to make the second surface undulate in a wave-like shape.

[0055] Optionally, the end plate structure 1 has a cavity 13 inside.

[0056] In this embodiment, for example Figure 6 In the second type of end plate structure 1 shown, the end plate structure 1 is a hollow structure, that is, the end plate structure 1 has a cavity 13 inside. In this way, the end plate structure 1 can reduce the overall weight of the battery pack and further improve its collapse deformation capability in the Y-axis direction, so as to further improve the absorption of the expansion force of the cell 21.

[0057] Optionally, the cavity 13 extends through the end plate structure 1 along a first direction or a second direction, and / or a supporting rib 14 is provided inside the cavity 13.

[0058] In this embodiment, for example Figure 6 In the second type of end plate structure 1 shown, the cavity 13 penetrates the end plate structure 1 along the first direction. That is, the front and rear ends of the cavity 13 are open ends rather than closed ends. This can reduce the difficulty of the end plate structure 1 collapsing in the Y-axis direction to a certain extent. In addition, this through cavity 13 is easy to form during processing.

[0059] In this embodiment, a support rib can also be provided in the cavity 13. The support rib extends along the penetrating direction of the cavity 13, and multiple support ribs are arranged sequentially along the penetrating direction perpendicular to the cavity 13. In this way, the support rib can provide a certain support for the end plate structure 1, so that the end plate structure 1 will not have too low strength due to the presence of the cavity 13.

[0060] Another embodiment of the present invention provides an end plate assembly, including the end plate structure 1 and the substrate 4 as described above, wherein the substrate 4 is disposed on the side of the end plate structure 1 facing the battery module 2.

[0061] In this embodiment, compared to the battery pack housing 3, the housing of the cell 21 is much more fragile than the battery pack housing 3. The protrusions and / or recesses on the first side 11 and the second side 12 of the end plate structure 1 will reduce the contact area between the end plate structure 1 and the cell or the battery pack housing. Therefore, this utility model provides an end plate assembly. After the end plate assembly is arranged between the housing 3 and the cell 21 at the far end of the battery module 2, the end plate assembly is specifically positioned with the substrate 4 facing the cell 21. That is, the substrate 4 is located between the end plate structure 1 and the cell 21. In this way, the substrate 4 can increase the force-bearing area between the cell 21 and the end plate structure 1. The expansion force of the cell 21 is transmitted to the end plate structure 1 more evenly through the substrate 4, and the absorption effect of the expansion force of the cell 21 is better. Secondly, due to the presence of the substrate 4, the end cell 21 will not be damaged due to the excessive concentration of the reaction force from the end plate structure 1. Instead, the substrate 4 can more evenly transmit the reaction force from the end plate structure 1 to the end cell 21, further improving the safety of the cell 21.

[0062] Optionally, see Figure 8-9 The end plate assembly further includes a connecting plate 5. The periphery of the substrate 4 is provided with a flange 41. The periphery of the end plate structure 1 is provided with the connecting plate 5. The connecting plate 5 and the first flange 41 at least partially overlap and are connected and fixed. The second side protrusion structure 122 of the end plate structure 1 is spaced apart from the substrate 4.

[0063] In this embodiment, the end plate structure 1 in the end plate assembly is illustrated by the first type of end plate structure 1 described above. The first type of end plate structure 1 can be a solid plate. The periphery of the end plate structure 1 (the front side, the rear side, the upper side, and the lower side constitute the periphery) is provided with a connecting plate 5 forming an annular shape. The end of the connecting plate 5 away from the substrate 4 does not exceed the first surface 11 of the end plate structure 1 (this end of the connecting plate 5 is connected to the side between the first surface 11 and the second surface 12 of the end plate structure 1). The other end of the annular connecting plate 5 can be inserted into or fitted into the annular flange 41 of the substrate 4. The connecting plate 5 and the flange 41 of the substrate 4 can be fixed by means of, for example, welding, to form the end plate assembly.

[0064] The second side protrusion 122 of the second surface 12 of the end plate structure 1 can contact the substrate 4 or not, preferably not. That is, the second side protrusion 122 is the part of the end plate structure 1 closest to the substrate 4, and it is spaced apart from the substrate 4. In this way, a cavity is also formed between the substrate 4 and the end plate structure 1 in the end plate assembly, thereby reducing the hardness of the end plate assembly on the Y-axis, improving the collapsible deformation capability of the end plate assembly on the Y-axis, and further improving the absorption capability of the expansion force of the cell 21 in the battery module 2.

[0065] Another embodiment of the present invention provides a battery pack, including a housing 3 and an end plate structure 1 as described above or an end plate assembly as described above.

[0066] Since the technical improvements and effects of the battery pack are the same as those of the end plate structure 1 or the end plate assembly, the battery pack will not be described in detail again.

[0067] See Figure 1 This is a schematic diagram showing the existing end plate 01 positioned between the battery module 2 and the housing 3; see [link / reference]. Figure 12 This is a schematic diagram showing the structure where the aforementioned end plate assembly replaces the existing end plate 01 and is disposed between the battery module 2 and the housing 3; see also Figure 13 This represents a schematic diagram of the structure where the second type of end plate structure 1 replaces the existing end plate 01 and is disposed between the battery module 2 and the housing 3. Figure 1 , Figure 12-13 In the battery pack, there are two battery modules 2, each battery module 2 includes 6 battery cells 21, and the two battery modules 2 have a total of 12 battery cells 21. Assume that these 12 battery cells 21 are numbered from left to right as cell 1, cell 2, cell 3, cell 4, cell 5, cell 6, cell 7, cell 8, cell 9, cell 10, cell 11, and cell 12.

[0068] See Figure 14 After simulation analysis, it was found that when the existing end plate 01 is placed between the battery module 2 and the housing 3, the expansion force of the cells 21 (cells 1, 6, 7, and 12) closer to the existing end plate 01 in the battery module 2 is greater than that of the cells 21 (cells 2, 3, 4, 5, 8, 9, 10, and 11) in the middle part. The expansion force of the 12 cells shows a W-shaped distribution, while the expansion force of the 6 cells 21 in a single battery module 2 shows a V-shaped distribution. The unevenness of the expansion force reaches 44.8%, and the maximum expansion force reaches 15.3KN. However, by using the present invention... Figure 12 The endplate assembly shown may be adopted Figure 13 When the second type of end plate structure 1 is shown, the expansion force non-uniformity is greatly reduced to only 18.4%, the non-uniformity is reduced by 25.6%, and the maximum expansion force is only 9.3KN, which is 39% lower than before. It can be seen that the end plate assembly of this embodiment or the aforementioned second type of end plate structure has a significant absorption effect on the expansion force of the cell 21 compared to the existing end plate 01.

[0069] Another embodiment of this utility model provides an automobile, including the battery pack as described above.

[0070] Since the technological improvements and effects of the vehicle are the same as those of the battery pack, the vehicle will not be described in detail again.

[0071] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" and "second" may explicitly or implicitly include at least one of those features.

[0072] Although the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. An end plate structure for being disposed between a battery module (2) and a battery pack housing (3), characterized in that, The end plate structure (1) includes a first surface (11) and a second surface (12) disposed opposite to each other. The first surface (11) is provided with a first side protrusion structure (111), and the second surface (12) is provided with a second side recess structure (121) at a position corresponding to the first side protrusion structure (111).

2. The end plate structure according to claim 1, characterized in that, Multiple first side protrusions (111) are distributed sequentially along a first direction, or multiple first side protrusions (111) are arrayed in two dimensions.

3. The end plate structure according to claim 2, characterized in that, The first surface (11) is further provided with a first side recess structure (112), and the second surface (12) is provided with a second side protrusion structure (122) at the position corresponding to the first side recess structure (112).

4. The end plate structure according to claim 3, characterized in that, Multiple first side recessed structures (112) and multiple first side protruding structures (111) are sequentially and alternately distributed along the first direction; or, multiple first side protruding structures (111) and multiple first side recessed structures (112) are arrayed in two dimensions, and each first side protruding structure (111) is staggered with the adjacent first side recessed structure (112) in two dimensions.

5. The end plate structure according to claim 4, characterized in that, The adjacent first side protrusion structure (111) is connected to the first side recess structure (112) to make the first surface undulate in a wave-like manner; and / or, the adjacent second side protrusion structure (122) is connected to the second side recess structure (121) to make the second surface undulate in a wave-like manner.

6. The end plate structure according to claim 1, characterized in that, The end plate structure (1) has a cavity (13) inside.

7. An endplate assembly, characterized in that, Includes an end plate structure (1) and a substrate (4) as described in any one of claims 1-6, wherein the substrate (4) is disposed on the side of the end plate structure (1) facing the battery module (2).

8. The end plate assembly according to claim 7, characterized in that, It also includes a connecting plate (5), the periphery of the substrate (4) is provided with a flange (41), the periphery of the end plate structure (1) is provided with the connecting plate (5), the connecting plate (5) and the flange (41) overlap at least partially and are connected and fixed, and the second side protrusion structure (122) of the end plate structure (1) is spaced apart from the substrate (4).

9. A battery pack, characterized in that, It includes a housing (3) and an endplate structure (1) as described in claims 1-6 or an endplate assembly as described in any one of claims 7-8.

10. A car, characterized in that, Includes the battery pack as described in claim 9.

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