Battery module and battery pack

Abstract

The utility model discloses a kind of battery module and battery pack, it is related to battery technical field.The battery module of the utility model includes battery pack and separator, battery pack includes multiple monomer batteries arranged along first direction, separator is located between two adjacent monomer batteries, separator includes first deformation part, second deformation part and third deformation part arranged along third direction, first deformation part, second deformation part and third deformation part all extend along second direction;Wherein, the minimum thickness of first deformation part along first direction is greater than the maximum thickness of second deformation part, the minimum thickness of third deformation part along first direction is greater than the maximum thickness of second deformation part.The battery module of the application is different by setting different position of separator as different thickness, to improve the uniformity of monomer battery stress.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery module and battery pack. Background Technology

[0002] During charge-discharge cycles, individual battery cells continuously expand, gradually generating and accumulating expansion forces between them. This can easily lead to damage to individual cells under pressure, deformation of the battery pack structure, and consequently affect the safety and lifespan of the battery pack. To mitigate this problem, existing technologies typically place foam of equal thickness between adjacent individual cells. The elastic deformation of the foam buffers the expansion forces, reducing damage to the individual cells and the battery pack structure.

[0003] However, in actual charge-discharge cycles, the expansion of individual battery cells is not uniformly distributed. Generally, it exhibits a larger expansion in the middle and a smaller expansion at the ends along the vertical direction. Because the foam is designed with uniform thickness, the middle part of the foam undergoes greater deformation due to the larger expansion amount during battery cell expansion, resulting in a greater elastic reaction force. This causes the compressive force on the middle of the battery cell to be much greater than the force on the ends. Consequently, this uneven stress on the individual battery cells leads to inconsistent performance at different locations, thus accelerating the performance degradation of individual cells and affecting the lifespan of the battery pack. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a battery module that improves the uniformity of force distribution on individual cells by setting different thicknesses at different positions of the separators.

[0005] This utility model also proposes a battery pack having the above-mentioned battery module.

[0006] The battery module according to a first aspect embodiment of the present invention includes: The battery pack includes multiple individual cells arranged along a first direction; A separator is disposed between two adjacent individual cells. The separator includes a first deformable portion, a second deformable portion, and a third deformable portion arranged along the third direction. The first deformable portion, the second deformable portion, and the third deformable portion all extend along the second direction. Wherein, the minimum thickness of the first deformable part along the first direction is greater than the maximum thickness of the second deformable part, and the minimum thickness of the third deformable part along the first direction is greater than the maximum thickness of the second deformable part.

[0007] The battery module according to the embodiment of this utility model has at least the following beneficial effects: In this application, the second deformable portion of the separator is thinner, while the first and third deformable portions are thicker. Therefore, even when at least one of the first and third deformable portions comes into contact with the large surface of the individual battery cell, a certain gap still exists between the second deformable portion and the large surface of the individual battery cell. During the initial expansion phase, when the central region of the individual battery cell expands and deforms first, this gap can be gradually filled. As the charge-discharge cycle progresses, the expansion of the individual battery cell gradually increases, and the end regions begin to expand and deform, applying pressure to the first and third deformable portions respectively. The central region also comes into contact with and applies pressure to the second deformable portion, causing all the deformable portions of the separator to undergo elastic deformation simultaneously. Simultaneously, the separator applies a uniform reaction force to the individual battery cell, effectively alleviating localized stress concentration caused by uneven force distribution and effectively extending the overall lifespan of the battery pack.

[0008] According to some embodiments of the present invention, the separator includes a first edge line and a second edge line disposed opposite to each other along the second direction, and the first deformable portion, the second deformable portion and the third deformable portion are all located between the first edge line and the second edge line; Each of the first deformable portion, the second deformable portion, and the third deformable portion extends to the first edge line and the second edge line at both ends along the second direction, respectively.

[0009] According to some embodiments of the present invention, the single battery cell includes a large surface perpendicular to the first direction, the large surface abutting against the separator; the large surface includes a third edge line and a fourth edge line extending along the second direction, the third edge line and the fourth edge line being arranged opposite to each other along the third direction, the large surface also having a center line, the third edge line and the fourth edge line being symmetrical with respect to the center line; Wherein, the center line, when projected onto the large surface along the first direction, falls within the projection area of ​​the second deformed part, the projection area of ​​the first deformed part is located between the third edge line and the center line, and the projection area of ​​the third deformed part is located between the fourth edge line and the center line.

[0010] According to some embodiments of the present invention, the thickness of the first deformed portion gradually decreases along the direction from the third edge line to the center line; And / or, along the direction from the fourth edge line to the center line, the thickness of the third deformed portion gradually decreases.

[0011] According to some embodiments of the present invention, along the direction from the third edge line to the fourth edge line, the thickness of the second deformed portion first gradually decreases and then gradually increases.

[0012] According to some embodiments of the present invention, the thickness of the first deformable portion is equal at all points along the third direction, the thickness of the second deformable portion is equal at all points along the third direction, and the thickness of the third deformable portion is equal at all points along the third direction.

[0013] According to some embodiments of the present invention, the thickness of the first deformed portion is equal to the thickness of the third deformed portion.

[0014] According to some embodiments of the present invention, the single battery cell includes a large surface perpendicular to the first direction, the large surface abutting against the separator; the separator has a central surface parallel to the large surface; The first deformable portion includes a first wall surface and a second wall surface disposed opposite to each other along the first direction, the first wall surface and the second wall surface being symmetrical with respect to the central surface.

[0015] According to some embodiments of the present invention, the single battery cell includes a large surface perpendicular to the first direction, the large surface abutting against the separator; the separator has a central surface parallel to the large surface; The second deformable part includes a third wall surface and a fourth wall surface disposed opposite to each other along the first direction, and the third wall surface and the fourth wall surface are symmetrical with respect to the center surface; And / or, the third deformable portion includes a fifth wall surface and a sixth wall surface disposed opposite to each other along the first direction, the fifth wall surface and the sixth wall surface being symmetrical with respect to the center surface.

[0016] According to some embodiments of the present invention, the maximum thickness of each separator gradually increases along the first direction from the end of the battery pack to the middle of the battery pack.

[0017] The battery pack according to a second aspect embodiment of the present invention includes the battery module mentioned in any of the above embodiments.

[0018] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the battery module according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the separator as viewed along the first direction according to an embodiment of the present utility model; Figure 3 This is an exploded schematic diagram of the separator and the adjacent single battery cell in an embodiment of the present invention. Figure 4 This is an exploded schematic diagram of the separator and the adjacent single cell in another embodiment of the present invention. Figure 5 This is a schematic diagram of the battery module of this utility model as viewed along the second direction; Figure 6 This is a schematic diagram of the separator as viewed along a first direction, representing another embodiment of the present invention.

[0020] Figure label: First direction X; Second direction Y; Third direction Z; Battery pack 100; Individual cell 110; Large surface 111; Third edge line 1111; Fourth edge line 1112; Center line 1113; Separator 200; First edge line 201; Second edge line 202; Center surface 203; First deformable part 210; First wall surface 211; Second wall surface 212; Second deformable part 220; Third wall surface 221; Fourth wall surface 222; Third deformable part 230; Fifth wall surface 231; Sixth wall surface 232; Fourth deformable part 240; Fifth deformable part 250; End plate 300. Detailed Implementation

[0021] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0022] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional 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.

[0023] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0024] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0025] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0026] During charge-discharge cycles, individual battery cells continuously expand, gradually generating and accumulating expansion forces between them. This can easily lead to damage to individual cells under pressure, deformation of the battery pack structure, and consequently affect the safety and lifespan of the battery pack. To mitigate this problem, existing technologies typically place foam of equal thickness between adjacent individual cells. The elastic deformation of the foam buffers the expansion forces, reducing damage to the individual cells and the battery pack structure.

[0027] However, in actual charge-discharge cycles, the expansion of individual battery cells is not uniformly distributed. Generally, it exhibits a larger expansion in the middle and a smaller expansion at the ends along the vertical direction. Because the foam is designed with uniform thickness, the middle part of the foam undergoes greater deformation due to the larger expansion amount during battery cell expansion, resulting in a greater elastic reaction force. This causes the compressive force on the middle of the battery cell to be much greater than the force on the ends. Consequently, this uneven stress on the individual battery cells leads to inconsistent performance at different locations, thus accelerating the performance degradation of individual cells and affecting the lifespan of the battery pack.

[0028] To address the aforementioned problems, this application proposes a battery module. For ease of subsequent description, this battery module is defined as having a first direction X, a second direction Y, and a third direction Z that are mutually perpendicular. The battery module is typically housed within the casing of a battery pack. The battery module includes at least one battery pack 100, such as... Figure 1 As shown, each battery pack 100 includes multiple individual battery cells 110 arranged along a first direction X. If the battery module includes multiple battery packs 100, then each battery pack 100 is arranged along a second direction Y.

[0029] In order to absorb the expansion force generated by the single cell 110 during charge and discharge cycles, such as Figure 1As shown, a separator 200 is provided between two adjacent individual cells 110. The separator 200 is made of a flexible material that can undergo elastic deformation under pressure. For example, the separator 200 can be made of aerogel, glass fiber, silicone, and other non-metallic heat-insulating materials. The separator 200 abuts against the corresponding individual cells 110 on both sides along the first direction X, thereby bearing and dispersing the expansion force exerted by the individual cells 110.

[0030] In addition, to accommodate the differences in expansion force at different locations of the individual cell 110, such as Figures 2 to 5 As shown, the separator 200 includes a first deformable portion 210, a second deformable portion 220, and a third deformable portion 230 arranged along a third direction Z. All three portions extend along a second direction Y. It should be noted that the first deformable portion 210 and the third deformable portion 230 correspond to the two ends of the single cell 110 along the third direction Z, while the second deformable portion 220 corresponds to the middle of the single cell 110 along the third direction Z. The minimum thickness of the first deformable portion 210 along the first direction X is greater than the maximum thickness of the second deformable portion 220, and the minimum thickness of the third deformable portion 230 along the first direction X is greater than the maximum thickness of the second deformable portion 220, thus exhibiting a distribution characteristic of being thinner in the middle and thicker at both ends along the third direction Z.

[0031] Understandably, because the second deformable portion 220 of the separator 200 is thinner, while the first deformable portion 210 and the third deformable portion 230 are thicker, a certain gap still exists between the second deformable portion 220 and the large surface 111 of the single cell 110 after at least one of the first deformable portion 210 and the third deformable portion 230 comes into contact with it. In the initial stage of expansion, when the central region of the single cell 110 expands and deforms first, this gap can be gradually filled. As the charge-discharge cycle progresses, the expansion of the single cell 110 gradually increases, and the end regions begin to expand and deform, applying pressure to the first deformable portion 210 and the third deformable portion 230 respectively. The central region also comes into contact with the second deformable portion 220 and applies pressure to it, thereby causing all the deformable portions of the separator 200 to undergo elastic deformation simultaneously. Simultaneously, the separator 200 applies a uniform reaction force to the individual cell 110, thereby effectively alleviating the local stress concentration caused by uneven force on the individual cell 110 and effectively extending the overall service life of the battery pack 100.

[0032] It should be explained that the thickness difference between the first deformation part 210 and the second deformation part 220, and the thickness difference between the third deformation part 230 and the second deformation part 220, can be designed and adjusted according to the specific expansion stress conditions. It is preferred that the deformation of the first deformation part 210, the second deformation part 220, and the third deformation part 230 are equal (i.e., the expansion forces they experience are equal). In practical applications, if the deformation difference between the first deformation part 210 and the second deformation part 220 is not greater than a set threshold, and the deformation difference between the third deformation part 230 and the second deformation part 220 is not greater than a set threshold, the overall stress balance of the single cell 110 can be ensured, reducing the impact of the reaction force of the separator 200 on the performance of the single cell 110.

[0033] In some embodiments, such as Figure 2 As shown, the separator 200 includes a first edge line 201 and a second edge line 202 disposed opposite to each other along a second direction Y, both extending along a third direction Z. A first deformable portion 210, a second deformable portion 220, and a third deformable portion 230 are all located between the first edge line 201 and the second edge line 202. Figure 2 As shown, the first deformation portion 210 extends to the first edge line 201 and the second edge line 202 at both ends along the second direction Y, and the second deformation portion 220 and the third deformation portion 230 are similarly extended, so that the separator 200 presents a structure that is thin in the middle and thick at both ends along the third direction Z.

[0034] In some embodiments, such as Figure 3 As shown, the single cell 110 includes a large surface 111 perpendicular to the first direction X, which abuts against the separator 200. The large surface 111 includes a third edge line 1111 and a fourth edge line 1112 extending along the second direction Y, with the third edge line 1111 and the fourth edge line 1112 positioned opposite each other along the third direction Z. The large surface 111 also has a center line 1113. The third edge line 1111 and the fourth edge line 1112 are symmetrical with respect to the center line 1113, meaning the distance from the third edge line 1111 to the center line 1113 is equal to the distance from the fourth edge line 1112 to the center line 1113. Therefore, the center line 1113 is located in the central region of the single cell 110.

[0035] The centerline 1113, projected onto the large surface 111 along the first direction X, falls within the projection area of ​​the second deformation portion 220, so that the second deformation portion 220 corresponds to the middle region of the single cell 110. The projection area of ​​the first deformation portion 210 is located between the third edge line 1111 and the centerline 1113, so that the first deformation portion 210 corresponds to one end region of the single cell 110. The projection area of ​​the third deformation portion 230 is located between the fourth edge line 1112 and the centerline 1113, so that the third deformation portion 230 corresponds to the other end region of the single cell 110. Thus, each deformation portion on the separator 200 corresponds one-to-one with each deformation region on the large surface 111 of the single cell 110, thereby reducing the difference in reaction force received by each region on the single cell 110 and improving the uniformity of force on the single cell 110.

[0036] In some embodiments, the thickness of the first deformable portion 210 gradually decreases along the direction from the third edge line 1111 to the center line 1113. The two sides of the first deformable portion 210 along the first direction X can be as follows: Figure 4 The arc shape shown can also be a slope, etc., to achieve a gradual decrease in thickness. Similarly, the third deformation part 230 can also be configured to have a gradual decrease in thickness, that is, the thickness of the third deformation part 230 gradually decreases along the direction from the fourth edge line 1112 to the center line 1113. Similarly, the second deformation part 220 can also be configured to have a gradual change in thickness, with the thickness of the second deformation part 220 first gradually decreasing and then gradually increasing along the direction from the third edge line 1111 to the fourth edge line 1112.

[0037] Understandably, by setting a deformation part with gradually varying thickness, the separator 200 can better adapt to the deformation pattern of the single cell 110 when it expands, which is conducive to achieving more refined absorption of expansion force, thereby improving the stress uniformity of the separator 200.

[0038] In some embodiments, the separator 200 may also employ a gradient thickness variation. That is, as... Figure 3 As shown, the first deformable portion 210 has equal thickness along the third direction Z, the second deformable portion 220 has equal thickness along the third direction Z, and the third deformable portion 230 also has equal thickness along the third direction Z. The thickness of the second deformable portion 220 is less than the thickness of both the first and third deformable portions 210, thus forming U-shaped structures on both sides of the separator 200. It is understandable that this type of separator 200 is simple to manufacture and has low cost.

[0039] Furthermore, the thickness of the first deformation portion 210 is equal to the thickness of the third deformation portion 230, thereby maintaining the force symmetry and consistency of the end region of the single cell 110.

[0040] It should be noted that, in this application, the separator 200 is described by way of example, including a first deformable portion 210, a second deformable portion 220, and a third deformable portion 230. However, those skilled in the art will understand that the separator 200 may also include a greater number of deformable portions, such as a fourth deformable portion 240, a fifth deformable portion 250, etc. For example, as shown... Figure 6 As shown, if the separator 200 is further provided with a fourth deformation part 240 and a fifth deformation part 250 on the outside of the first deformation part 210 and the third deformation part 230, the fourth deformation part 240, the first deformation part 210, the second deformation part 220, the third deformation part 230 and the fifth deformation part 250 are arranged sequentially along the third direction Z, and the thickness of the fourth deformation part is greater than the thickness of the first deformation part 210, and the thickness of the fifth deformation part is greater than the thickness of the third deformation part 230, thereby achieving a finer thickness gradient distribution, thereby matching the more complex expansion deformation characteristics of the single cell 110.

[0041] In some embodiments, the separator 200 further has a center surface 203 parallel to the large surface 111. To ensure uniform force distribution on the individual cells 110 on both sides adjacent to the separator 200, the separator 200 is symmetrically arranged with respect to the center surface 203. Specifically, as shown... Figure 3 As shown, the first deformable portion 210 includes a first wall surface 211 and a second wall surface 212 arranged opposite to each other along the first direction X, and the first wall surface 211 and the second wall surface 212 are symmetrical with respect to the center surface 203. The second deformable portion 220 includes a third wall surface 221 and a fourth wall surface 222 arranged opposite to each other along the first direction X, and the third wall surface 221 and the fourth wall surface 222 are symmetrical with respect to the center surface 203. The third deformable portion 230 includes a fifth wall surface 231 and a sixth wall surface 232 arranged opposite to each other along the first direction X, and the fifth wall surface 231 and the sixth wall surface 232 are symmetrical with respect to the center surface 203.

[0042] The foregoing embodiments all describe the structural design of a single separator 200 to match the expansion deformation characteristics of a single battery cell 110. For the entire battery pack 100, since the single batteries 110 at both ends are often in contact with the end plates 300, the expansion displacement and expansion force of the single batteries 110 at both ends are transmitted towards the single battery 110 in the middle. Therefore, a distribution pattern emerges where the expansion stress on the end single batteries 110 is small, and the expansion stress on the middle single batteries 110 is large. To match this non-uniform stress distribution characteristic, the thickness of the separators 200 at different locations can also be designed differently. For example, as shown... Figure 5 As shown, along the first direction X from the end of the battery pack 100 to the middle of the battery pack 100, the maximum thickness of each separator 200 gradually increases to provide sufficient expansion buffer space and absorb the corresponding expansion stress.

[0043] In some embodiments, such as Figure 3 As shown, the maximum thickness A of the separator 200 along the first direction X has the following relationship with the thickness B of the single cell 110: 0.01B≤A≤0.1B.

[0044] A second aspect of this application also provides a battery pack comprising the battery module mentioned in any of the foregoing embodiments. Since this battery pack includes all the technical solutions in any of the foregoing embodiments, it should also include the beneficial effects of those embodiments, which will not be elaborated upon here.

[0045] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A battery module having a first direction (X), a second direction (Y), and a third direction (Z) that are mutually perpendicular, characterized in that, include: The battery pack (100) includes a plurality of individual cells (110) arranged along a first direction (X). A separator (200) is disposed between two adjacent single cells (110). The separator (200) includes a first deformable portion (210), a second deformable portion (220), and a third deformable portion (230) arranged along the third direction (Z). The first deformable portion (210), the second deformable portion (220), and the third deformable portion (230) all extend along the second direction (Y). Wherein, the minimum thickness of the first deformable part (210) along the first direction (X) is greater than the maximum thickness of the second deformable part (220), and the minimum thickness of the third deformable part (230) along the first direction (X) is greater than the maximum thickness of the second deformable part (220).

2. The battery module according to claim 1, characterized in that, The separator (200) includes a first edge line (201) and a second edge line (202) disposed opposite to each other along the second direction (Y), and the first deformable part (210), the second deformable part (220) and the third deformable part (230) are all located between the first edge line (201) and the second edge line (202); Each of the first deformable portion (210), the second deformable portion (220) and the third deformable portion (230) extends to the first edge line (201) and the second edge line (202) respectively along the second direction (Y).

3. The battery module according to claim 1, characterized in that, The single cell (110) includes a large surface (111) perpendicular to the first direction (X), the large surface (111) abutting against the separator (200); the large surface (111) includes a third edge line (1111) and a fourth edge line (1112) extending along the second direction (Y), the third edge line (1111) and the fourth edge line (1112) being arranged opposite to each other along the third direction (Z), the large surface (111) also having a center line (1113), the third edge line (1111) and the fourth edge line (1112) being symmetrical with respect to the center line (1113); Among them, the orthographic projection along the first direction (X) onto the large surface (111) is such that the center line (1113) falls into the projection area of ​​the second deformable part (220), the projection area of ​​the first deformable part (210) is located between the third edge line (1111) and the center line (1113), and the projection area of ​​the third deformable part (230) is located between the fourth edge line (1112) and the center line (1113).

4. The battery module according to claim 3, characterized in that, Along the direction from the third edge line (1111) to the center line (1113), the thickness of the first deformed part (210) gradually decreases; And / or, along the direction from the fourth edge line (1112) to the center line (1113), the thickness of the third deformed portion (230) gradually decreases.

5. The battery module according to claim 3, characterized in that, Along the direction from the third edge line (1111) to the fourth edge line (1112), the thickness of the second deformed portion (220) first gradually decreases and then gradually increases.

6. The battery module according to claim 1, characterized in that, The first deformable portion (210) has equal thickness at all points along the third direction (Z), the second deformable portion (220) has equal thickness at all points along the third direction (Z), and the third deformable portion (230) has equal thickness at all points along the third direction (Z).

7. The battery module according to claim 6, characterized in that, The thickness of the first deformed part (210) is equal to the thickness of the third deformed part (230).

8. The battery module according to claim 1, characterized in that, The single cell (110) includes a large surface (111) perpendicular to the first direction (X), the large surface (111) abutting against the separator (200); the separator (200) has a central surface (203) parallel to the large surface (111). The first deformable part (210) includes a first wall surface (211) and a second wall surface (212) disposed opposite to each other along the first direction (X), the first wall surface (211) and the second wall surface (212) being symmetrical with respect to the central plane (203).

9. The battery module according to claim 1, characterized in that, The single cell (110) includes a large surface (111) perpendicular to the first direction (X), the large surface (111) abutting against the separator (200); the separator (200) has a central surface (203) parallel to the large surface (111). The second deformable part (220) includes a third wall surface (221) and a fourth wall surface (222) disposed opposite to each other along the first direction (X), wherein the third wall surface (221) and the fourth wall surface (222) are symmetrical with respect to the center surface (203); And / or, the third deformable part (230) includes a fifth wall surface (231) and a sixth wall surface (232) disposed opposite to each other along the first direction (X), the fifth wall surface (231) and the sixth wall surface (232) being symmetrical with respect to the center surface (203).

10. The battery module according to claim 1, characterized in that, Along the first direction (X) from the end of the battery pack (100) to the middle of the battery pack (100), the maximum thickness of each separator (200) gradually increases.

11. A battery pack, characterized in that, Includes the battery module as described in any one of claims 1 to 10.

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