Battery cushion and battery module

Abstract

The utility model discloses a battery cushion pad and battery module, wherein the battery cushion pad comprises a cushion pad body and a plurality of buffer modules, the cushion pad body is provided with a plurality of buffer modules, each buffer module comprises a buffer shell, a filler and a weak part, the buffer shell is provided with a buffer cavity, and a storage area and a buffer area are arranged in the buffer cavity. The filler is arranged in the storage area, weak parts are arranged between the storage area and the buffer area as well as between the buffer area and the buffer shell, the filler can break through the weak parts arranged adjacent to the filler to extend to the buffer area, and the filler can continue to break through other weak parts until the buffer cavity is filled with the filler. According to the battery buffer pad, the buffer module is arranged on the buffer pad body, and the filler in the storage area of the buffer module can break through the weak part to be released to the buffer area under the expansion extrusion of the battery, so that the storage space of the filler is increased, and the abutting force between the filler and the battery is reduced; therefore, the overall expansibility of the battery module can be reduced.

Description

Technical Field

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

[0002] Lithium-ion battery modules have advantages such as high volumetric energy density and gravimetric energy density, long lifespan, low self-discharge, and environmental friendliness, and are widely used in mobile communication devices, laptops, electric vehicles, and other fields. During daily charge and discharge cycles, lithium-ion battery modules are prone to expansion and deformation. Therefore, buffer pads are usually placed between two adjacent batteries or between the battery and the casing to alleviate the expansion force of the battery.

[0003] Currently, the buffer pads of battery modules are typically made of elastic foam of a single material, sandwiched between the battery and the casing or between two adjacent batteries. Existing technology has the following drawbacks: the elastic foam is continuously compressed as the battery expands, leading to a continuous increase in the overall expansion force of the battery module, affecting its performance and lifespan in the later stages of use. Utility Model Content

[0004] The purpose of this utility model is to provide a battery buffer pad and a battery module, which has a simple structure and the clamping force of the filling material in the buffer module is adjustable.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] In a first aspect, a battery buffer pad is provided, which is disposed between a battery and a casing or between two adjacent batteries. The battery buffer pad includes a buffer pad body and buffer modules. Multiple buffer modules are spaced apart on the buffer pad body. Each buffer module includes a buffer casing, a filler, and a weak part. The buffer casing has a buffer cavity, which is provided with a storage area and at least one buffer zone. The filler is disposed in the storage area. The weak part is provided between the storage area and the buffer zone, and between the buffer zone and the buffer casing. Under the expansion and compression of the battery, the filler can break through the weak parts arranged adjacent to the filler and extend into the buffer zone. Under continuous compression, the filler can also continue to break through other weak parts until it fills the buffer cavity.

[0007] As a preferred embodiment of the battery buffer pad, the buffer module further includes a first elastic bag and a second elastic bag. The storage area is disposed in the first elastic bag, and the buffer zone is disposed in the second elastic bag. At least one second elastic bag is sleeved outside the first elastic bag at intervals. The second elastic bags are disposed at intervals within the buffer cavity. The first elastic bag and the second elastic bag form the weak part.

[0008] As a preferred embodiment of the battery cushioning pad, the rupture pressure value of the second elastic bag is S1, and the rupture pressure value of the first elastic bag is S2, where S1 > S2.

[0009] As a preferred embodiment of the battery cushioning pad, the cushioning module includes a plurality of second elastic bags, with the first elastic bag being covered by a plurality of second elastic bags in layers.

[0010] As a preferred embodiment of the battery cushioning pad, the bursting pressure value of the second elastic bag body farther away from the filler is greater than that of the second elastic bag body closer to the filler.

[0011] As a preferred embodiment of the battery buffer pad, the number of the second elastic pockets of the buffer module near the center of the buffer pad body is Q1, and the number of the second elastic pockets of the buffer module near the outer edge of the buffer pad body is Q2, where Q1 > Q2.

[0012] As a preferred embodiment of the battery cushioning pad, the cushioning cavity and / or the second elastic bag body are vacuum-set.

[0013] As a preferred embodiment of the battery buffer pad, the buffer cavity is provided with a plurality of weak portions spaced apart along a first direction. The plurality of weak portions space the buffer cavity to form a storage cavity and a plurality of release cavities arranged side by side along the first direction on one side of the storage cavity. The storage area is disposed in the storage cavity, and the buffer zone is disposed in the release cavity.

[0014] As a preferred embodiment of the battery cushioning pad, along the first direction, the rupture pressure value of the weak portion away from the filler is greater than the rupture pressure value of the weak portion near the filler.

[0015] As a preferred embodiment of the battery buffer pad, the buffer cavity is provided with a plurality of weak parts, all of which are arranged at intervals along the circumference of the buffer cavity, dividing the buffer cavity into a first buffer sub-cavity and a plurality of second buffer sub-cavities. The first buffer sub-cavity is provided with a storage area, and each second buffer sub-cavity is provided with a buffer zone.

[0016] As a preferred embodiment of the battery buffer pad, the buffer pad body abuts against the battery or the housing on one side along the second direction, and a plurality of buffer modules are spaced apart on at least one side of the buffer pad body along the second direction; or,

[0017] The buffer pad body is provided with a plurality of mounting ports at intervals. All of the mounting ports penetrate the buffer pad body on both sides along the second direction. The buffer module is disposed in the mounting port, and at least part of the filler is exposed in the mounting port and abuts against the battery or the housing.

[0018] As a preferred embodiment of the battery buffer pad, the filler is provided in a gaseous, liquid, or powdered solid state.

[0019] Secondly, a battery module is provided, including a housing, a battery and the aforementioned battery buffer pad. The housing is provided with a placement cavity, and multiple batteries are arranged side by side to form a battery pack. The battery pack is inserted into the placement cavity, and the battery buffer pad is provided between the battery pack and the cavity wall of the placement cavity and / or between two adjacent batteries.

[0020] The beneficial effects of this utility model are as follows: By setting a buffer module on the buffer pad body, and the filler in the buffer module's storage area can break through the weak part and be released into the buffer zone under the pressure of battery expansion, the filling space is increased, the clamping force between the filler and the battery is reduced, thereby reducing the overall expansion force of the battery module, mitigating the fatigue, performance degradation, and structural aging of battery module materials caused by excessive battery expansion, and ensuring the safety and service life of the overall battery module structure. By setting at least one buffer zone, the filler can continue to break through the weak part of the buffer zone and extend to the next buffer zone or be released into the buffer cavity under the continuous expansion and pressure of the battery. This allows the clamping force of the battery expansion on the filler to rise to the rupture pressure value of the weak part of the buffer zone and be effectively released, actively reducing the expansion force inside the battery module, so that the expansion force of the battery module can be maintained in a relatively stable and reasonable range, improving the long-term performance and reliability of the battery module. Attached Figure Description

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a schematic diagram of the structure of a battery buffer pad according to an embodiment of the present invention;

[0023] Figure 2 This is a cross-sectional view of a battery buffer pad according to an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of the battery buffer pad according to another embodiment of the present invention. Figure 1 ;

[0025] Figure 4 This is a schematic diagram of the structure of the battery buffer pad according to another embodiment of the present invention. Figure 2 ;

[0026] Figure 5 This is a schematic diagram of the structure of the battery buffer pad according to another embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of the structure of a battery buffer pad according to another embodiment of the present invention.

[0028] In the picture:

[0029] 1. Buffer pad body; 11. Mounting port; 2. Buffer module; 21. Buffer housing; 211. Buffer cavity; 2111. Storage area; 2112. Buffer zone; 2113. Storage cavity; 2114. Release cavity; 2115. First buffer sub-cavity; 2116. Second buffer sub-cavity; 22. Filler; 23. Weak part; 231. First elastic bag body; 232. Second elastic bag body. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0031] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0034] like Figure 1 and Figure 2 As shown, the battery buffer pad of this embodiment is disposed between the battery and the casing or between two adjacent batteries. The battery buffer pad includes a buffer pad body 1 and buffer modules 2. Multiple buffer modules 2 are spaced apart on the buffer pad body 1. Each buffer module 2 includes a buffer shell 21, a filler 22, and a weak part 23. The buffer shell 21 has a buffer cavity 211, which is provided with a storage area 2111 and at least one buffer zone 2112. The filler 22 is disposed in the storage area 2111. Weak parts 23 are provided between the storage area 2111 and the buffer zone 2112, and between the buffer zone 2112 and the buffer shell 21. Under the expansion and compression of the battery, the filler 22 can break through the weak parts 23 adjacent to the filler 22 and extend into the buffer zone 2112. Under continuous compression, the filler 22 can also continue to break through other weak parts 23 until it fills the buffer cavity 211. It should be noted that other weak parts 23 usually refer to weak parts 23 that are not adjacent to the filler 22.

[0035] It is understandable that by setting a buffer module 2 on the buffer pad body 1, and the filler 22 in the storage area 2111 of the buffer module 2 being able to break through the weak part 23 and be released into the buffer zone 2112 under the pressure of battery expansion, the storage space of the filler 22 is increased, the clamping force between the filler 22 and the battery is reduced, thereby reducing the overall expansion force of the battery module, mitigating the fatigue, performance degradation and structural aging of the battery module material caused by excessive battery expansion, and ensuring the safety and service life of the overall structure of the battery module; by setting at least one buffer zone 2112, the filler 22 can continue to break through the weak part 23 of the buffer zone 2112 and extend to the next buffer zone 2112 or be released into the buffer cavity 211 under the continuous expansion and pressure of the battery, so that the clamping force of the battery expansion on the filler 22 can be effectively released after rising to the rupture pressure value of the weak part 23 of the buffer zone 2112, actively reducing the expansion force inside the battery module, so that the expansion force of the battery module can be maintained in a relatively stable and reasonable range, and improving the long-term performance and reliability of the battery module.

[0036] In some embodiments, such as Figure 2As shown, the buffer module 2 also includes a first elastic bag 231 and a second elastic bag 232. A storage area 2111 is disposed within the first elastic bag 231, and a buffer zone 2112 is disposed within the second elastic bag 232. At least one second elastic bag 232 is spaced outside the first elastic bag 231. The second elastic bags 232 are spaced within the buffer cavity 211. The first elastic bag 231 and the second elastic bag 232 form a weak point 23. Taking the example of only one second elastic bag 232 outside the first elastic bag 231, by placing the filler 22 inside the first elastic bag 231, the filler 22, under the pressure of battery expansion, can continuously press against the filler 22 inside the first elastic bag 231. This allows the filler 22 to pre-break through the first elastic bag 231 and be released into the second elastic bag 232, which has a larger capacity. This effectively releases the expansion stress on the filler 22 and the overall expansion force of the battery module after reaching the rupture pressure value of the first elastic bag 231.

[0037] Of course, as the battery continues to expand, it will exert an increasing expansion force on the second elastic bag 232 and the filling material 22 inside the second elastic bag 232, until the filling material 22 breaks through the second elastic bag 232 and is released into the buffer cavity 211 with a larger capacity. This allows the expansion stress on the filling material 22 and the overall expansion force of the battery module to reach the rupture pressure value of the second elastic bag 232 and be effectively released again.

[0038] Optionally, when the buffer module 2 includes multiple second elastic bags 232, taking the example of only one second elastic bag 232 layered outside the first elastic bag 231, as the battery continues to expand, it will apply an increasing expansion force to the second elastic bags 232 arranged adjacent to the first elastic bag 231 and the filling material 22 inside the second elastic bag 232, until the filling material 22 breaks through the second elastic bag 232 and is released into the next second elastic bag 232 with a larger accommodating space. This process is repeated layer by layer to break through the second elastic bags 232 and finally fill the buffer cavity 211. This ensures that the expansion stress on the filling material 22 and the overall expansion force of the battery module reach the rupture pressure value of each second elastic bag 232 and are continuously and effectively released, maintaining a relatively stable and reasonable range, effectively improving the long-term performance and reliability of the battery module.

[0039] Furthermore, the rupture pressure value of the second elastic bag 232 is S1, and the rupture pressure value of the first elastic bag 231 is S2, where S1 > S2. In other words, the accommodating space of the second elastic bag 232 is larger than that of the first elastic bag 231. Therefore, by increasing the rupture pressure value of the second elastic bag 232, the extreme value of the overall expansion force of the battery module can be balanced. Moreover, by increasing the rupture pressure value of the second elastic bag 232, i.e., increasing the toughness of the second elastic bag 232, the rate of change of pressure borne by the second elastic bag 232 can be reduced, preventing the sudden change in pressure generated by expansion from causing a certain impact on the battery buffer pad or even the entire battery module.

[0040] Similarly, the rupture pressure value of the second elastic bag 232 farther away from the filler 22 is greater than that of the second elastic bag 232 closer to the filler 22. That is, the accommodating space of the outer second elastic bag 232 is greater than that of the inner second elastic bag 232 (or the accommodating elastic bag adjacent to the first elastic bag 231). Therefore, by increasing the rupture pressure value of the outer second elastic bag 232, the extreme value of the overall expansion force of the battery module can be balanced. Furthermore, by gradually increasing the rupture pressure value of the second elastic bag 232 from the inside out, that is, gradually increasing the toughness of the second elastic bag 232 from the inside out, the rate of change of stress borne by the outer second elastic bag 232 can be gradually reduced, preventing the stress generated by expansion from changing suddenly and causing a certain impact on the battery buffer pad or even the entire battery module.

[0041] Furthermore, the stress and expansion degree vary at each location on the contact surface between the battery and the battery buffer pad. The expansion is greater near the center of the battery, resulting in greater stress on the battery buffer pad at that location. Therefore, the number of second elastic pockets 232 in the buffer module 2 near the center of the buffer pad body 1 is Q1, and the number of second elastic pockets 232 in the buffer module 2 near the outer edge of the buffer pad body 1 is Q2, where Q1 > Q2. This allows the buffer module 2 at the center of the battery buffer pad to provide more buffer space to release the expansion force, while also ensuring more uniform stress distribution across the contact surface between the battery and the battery buffer pad. Additionally, the expansion force variation curves at all locations on the entire contact surface are relatively stable, guaranteeing the safety of the battery and battery module.

[0042] Preferably, the buffer cavity 211 and the second elastic bag 232 are vacuum-sealed. By vacuum-sealing the buffer cavity 211 and the second elastic bag 232, a larger capacity for the buffer material is provided, ensuring the tight fit between the filler 22 and the battery. Of course, in some embodiments, the buffer cavity 211 is vacuum-sealed while the second elastic bag 232 contains some gas; or the buffer cavity 211 contains some gas to provide a smoother space for the filler 22 to extend, while the second elastic bag 232 is vacuum-sealed.

[0043] In other embodiments, such as Figure 5 As shown, a plurality of weak portions 23 are provided at intervals along the first direction in the buffer cavity 211. The plurality of weak portions 23 divide the buffer cavity 211 into a receiving cavity 2113 and a plurality of release cavities 2114 arranged side by side along the first direction on one side of the receiving cavity 2113. The receiving area 2111 is provided in the receiving cavity 2113 and the buffer zone 2112 is provided in the release cavity 2114. Under the expansion and compression of the battery, the filler 22 can break through the storage cavity 2113 and extend along the first direction into the release cavity 2114 adjacent to the storage cavity 2113. Under the continuous expansion and compression of the battery, the filler 22 can also continue to break through the weak part 23 between the release cavities 2114 one by one along the first direction and extend into the next release cavity 2114 until it fills the entire buffer cavity 211. Under the continuous expansion and compression of the battery, the filler 22 can continuously break through the weak part 23 along the first direction and extend into the next release cavity 2114. That is, the pressure of the battery expansion on the filler 22 can be effectively released after it rises to the rupture pressure value of the weak part 23 of the space where the storage cavity 2113 and the release cavity 2114 meet. This actively reduces the expansion force inside the battery module, so that the expansion force of the battery module can be maintained in a relatively stable and reasonable range, thereby improving the long-term performance and reliability of the battery module.

[0044] Furthermore, along the first direction, the rupture pressure value of the weak portion 23 away from the filler 22 is greater than that of the weak portion 23 closer to the filler 22. As the filler 22 continuously breaks through the weak portion 23 along the first direction, the accommodating space of the filler 22 becomes larger and larger. Therefore, by increasing the rupture pressure value of the weak portion 23 away from the filler 22, the extreme value of the overall expansion force of the battery module can be balanced. Moreover, as the filler 22 continuously breaks through along the first direction, the stress it experiences due to battery expansion and the rate of stress change also become larger and larger. Therefore, by increasing the rupture pressure value of the weak portion 23 away from the filler 22, that is, increasing the toughness of the weak portion 23 away from the filler 22, the rate of stress change experienced by the weak portion 23 away from the filler 22 can be reduced, ensuring the stability of the buffer module 2 in use.

[0045] In other embodiments, such as Figure 6As shown, the buffer cavity 211 is provided with a plurality of weak parts 23. All the weak parts 23 are arranged at intervals along the circumference of the buffer cavity 211, dividing the buffer cavity 211 into a first buffer sub-cavity 2115 and a plurality of second buffer sub-cavities 2116. The first buffer sub-cavity 2115 is provided with a storage area 2111, and each second buffer sub-cavity 2116 is provided with a buffer zone 2112.

[0046] For example, taking the cross-section of the buffer cavity 211 as circular, i.e., the buffer cavity 211 is a cylindrical cavity, multiple weak parts 23 are evenly distributed in a ring around the central axis of the cylindrical cavity to space the buffer cavity 211. The two second buffer sub-cavities 2116 adjacent to the first buffer sub-cavity 2115 are the first buffer sub-cavity and the tail buffer sub-cavity. Multiple second buffer sub-cavities 2116 are also provided between the first buffer sub-cavity and the tail buffer sub-cavity. Therefore, the filling material 22 in the first buffer sub-cavity 2115 can break through the weak part 23 between it and the first buffer sub-cavity and extend into the first buffer sub-cavity. Moreover, the circumference of the cylindrical cavity can successively break through the weak part 23 and extend to the next second buffer sub-cavity 2116 until it breaks through to the tail buffer sub-cavity.

[0047] If the strength of the weak points 23 between the first buffer sub-cavity 2115 and the first buffer sub-cavity, and between the first buffer sub-cavity 2115 and the tail buffer sub-cavity is consistent, then the filler 22 can simultaneously break through the weak points 23 between the first buffer sub-cavity 2115 and the first buffer sub-cavity, and between the first buffer sub-cavity 2115 and the tail buffer sub-cavity, and extend into both the first and tail buffer sub-cavities. This allows the force exerted on the filler 22 by the battery expansion to rise to the rupture pressure value of the weak point 23 in that area, and then be effectively released, actively reducing the expansion force inside the battery module. Furthermore, the cross-section of the buffer cavity 211 can also be triangular, quadrilateral, pentagonal, etc., which will not be listed here.

[0048] In this embodiment, as Figure 1 As shown, the buffer pad body 1 abuts against the battery or housing on one side along the second direction, and multiple buffer modules 2 are spaced apart on at least one side of the buffer pad body 1 along the second direction. By placing the buffer modules 2 on the surface of the buffer pad body 1, the buffer modules 2 can directly contact the battery, effectively improving the fit between the buffer modules 2 and the battery and ensuring the buffering performance of the buffer modules 2.

[0049] In addition, such as Figure 3 and Figure 4As shown, in addition to setting the buffer module 2 on the surface of the buffer pad body 1, multiple mounting holes 11 can be provided at intervals on the buffer pad body 1. All mounting holes 11 penetrate both sides of the buffer pad body 1 along the second direction (the second direction is the Y direction shown in the figure). The buffer module 2 is set inside the mounting hole 11, and at least part of the filler 22 is exposed outside the mounting hole 11 and abuts against the battery or casing. By setting the buffer module 2 inside the mounting hole 11, the space occupied by the battery buffer pad along the second direction is effectively reduced, thereby ensuring the space utilization rate of the battery module. It should be noted that, in order to ensure the buffering performance of the battery buffer pad, the filler 22 is still partially exposed outside the mounting hole 11 and abuts against the battery even after breaking through all the weak parts 23, so as to ensure that the filler 22 can always buffer the expansion and clamping force of the battery. It should be noted that when the batteries are arranged side by side along the second direction, the expansion force between the batteries is mainly concentrated in the second direction, which is perpendicular to the first direction mentioned above (the first direction is the X direction shown in the figure).

[0050] Furthermore, the filler 22 is provided in a gaseous, liquid, or powdered solid state. That is, the filler 22 can be a medium of gas, liquid, or pulverized solid. Gas compression is relatively difficult, so for cost considerations, liquid or powdered solid is preferred. It has good flow effect, that is, good extensibility.

[0051] This utility model also provides a battery module, including a housing, a battery, and a battery buffer pad from any of the above embodiments. The housing has a placement cavity, and multiple batteries are arranged side by side to form a battery pack. The battery pack is inserted into the placement cavity, and battery buffer pads are provided between the battery pack and the cavity wall and between two adjacent batteries. The battery buffer pad of this solution can effectively regulate the clamping force between the batteries. That is, the filling material 22 of the buffer module 2 of the battery buffer pad can break through the weak part 23 and be released into the buffer zone 2112 under the pressure of battery expansion, thereby increasing the accommodating space of the filling material 22 and reducing the clamping force between the filling material 22 and the battery. This can actively reduce the overall expansion force of the battery module, so that the expansion force of the battery module can be maintained within a relatively stable and reasonable range, improving the long-term performance and reliability of the battery module.

[0052] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A battery cushion pad disposed between a battery and a housing or between two adjacent batteries, characterized by, The battery cushion pad comprises: a cushion pad body; a plurality of buffer modules are arranged on the cushion pad body, each buffer module comprises a buffer shell, a filler and a weak part, the buffer shell has a buffer cavity, the buffer cavity is provided with a receiving area and at least one buffer area, the filler is arranged in the receiving area, the receiving area and the buffer area, and the buffer area and the buffer shell are provided with the weak part, under the expansion and extrusion of the battery, the filler can break through the weak part arranged adjacent to the filler and extend to the buffer area, and under continuous extrusion, the filler can continue to break through other weak parts until the buffer cavity is filled.

2. The battery cushion of claim 1, wherein, The buffer module further comprises a first elastic bag body and a second elastic bag body, the receiving area is arranged in the first elastic bag body, the buffer area is arranged in the second elastic bag body, at least one second elastic bag body is arranged outside the first elastic bag body, and the second elastic bag body is arranged in the buffer cavity; the first elastic bag body and the second elastic bag body form the weak part.

3. The battery cushion of claim 2, wherein, The breaking pressure value of the second elastic bag body is S1, and the breaking pressure value of the first elastic bag body is S2, S1>S2.

4. The battery cushion of claim 2, wherein, The buffer module comprises a plurality of second elastic bag bodies, and a plurality of second elastic bag bodies are arranged outside the first elastic bag body in a hierarchical manner.

5. The battery cushion of claim 4, wherein, The breaking pressure value of the second elastic bag body away from the filler is greater than that of the second elastic bag body close to the filler.

6. The battery cushion of claim 4, wherein, The number of second elastic bag bodies of the buffer module close to the center position of the cushion pad body is Q1, and the number of second elastic bag bodies of the buffer module close to the outer edge position of the cushion pad body is Q2, Q1>Q2.

7. The battery cushion of claim 2, wherein, The buffer cavity and / or the second elastic bag body are provided with a vacuum.

8. The battery cushion of claim 1, wherein, A plurality of weak parts are arranged in the buffer cavity in a first direction, and the buffer cavity is divided into a receiving cavity and a plurality of release cavities arranged side by side on one side of the receiving cavity by the plurality of weak parts, the receiving area is arranged in the receiving cavity, and the buffer area is arranged in the release cavity.

9. The battery cushion of claim 8, wherein, In the first direction, the breaking pressure value of the weak part away from the filler is greater than that of the weak part close to the filler.

10. The battery cushion of claim 1, wherein, A plurality of weak parts are arranged in the buffer cavity, and all the weak parts are arranged in a circumferential direction of the buffer cavity to divide the buffer cavity into a first buffer sub-cavity and a plurality of second buffer sub-cavities, the receiving area is arranged in the first buffer sub-cavity, and the buffer area is arranged in each second buffer sub-cavity.

11. The battery cushion of any one of claims 1-10, wherein, One side of the cushion pad body in a second direction abuts against the battery or the shell, and a plurality of buffer modules are arranged on the surface of at least one side of the cushion pad body in the second direction; or A plurality of mounting openings are arranged on the cushion body in intervals, all of the mounting openings penetrating through the cushion body along both sides of the second direction, the cushion module is arranged in the mounting opening, and at least part of the filler is exposed to the mounting opening and abuts against the battery or the shell.

12. The battery cushion of any one of claims 1-10, wherein, The filler is in a gaseous state, a liquid state or a powder solid state.

13. A battery module, comprising a shell, a battery and the battery cushion as claimed in any one of claims 1-12, the shell being provided with a placing cavity, a plurality of the batteries being arranged side by side to form a battery pack, the battery pack being inserted into the placing cavity, and the battery cushion being arranged between the battery pack and a cavity wall of the placing cavity and / or between two adjacent batteries.

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