Battery and electric equipment

Abstract

The invention discloses a battery (100) and electric equipment, and relates to the field of batteries. A battery (100) includes a battery cell (20) and a support (30). The battery monomer (20) comprises a shell (21) and a pressure relief component (212), the shell (21) comprises a first wall part (211), and the pressure relief component (212) is arranged on the first wall part (211). The pressure relief component (212) comprises a first groove (2121), and the pressure relief component (212) is configured to be capable of cracking along the first groove (2121) when the battery monomer (20) is subjected to pressure relief. The supporting piece (30) supports the first wall part (211), the supporting piece (30) is provided with a supporting face (31) facing the first wall part (211), and the supporting face (31) is provided with an avoiding part (32). The projection of the first groove (2121) is located in the avoiding part (32) in the thickness direction of the first wall part (211). According to the present invention, by providing the avoidance portion (32) on the support member (30) and positioning the projection of the first groove (2121) in the thickness direction of the first wall portion (211) in the avoidance portion (32), the avoidance portion (32) can avoid the first groove (2121), and the support member (30) is not easy to abut against the outer side of the first groove (2121) when the battery cell (20) is subjected to pressure relief, and is not easy to suppress the cracking of the first groove (2121), thereby improving the reliability of the battery cell (20). Therefore, the first groove (2121) can crack in time when the battery monomer (20) is decompressed, and the reliability of the battery (100) can be improved.

Description

Batteries and electrical equipment Technical Field

[0001] The present application relates to the field of batteries, and more specifically, to a battery and an electrical device. Background Art

[0002] Batteries are widely used in new energy applications, such as electric vehicles and new energy vehicles. These have become a new trend in the automotive industry. The development of battery technology requires consideration of multiple design factors, including performance parameters such as battery life, energy density, discharge capacity, and charge / discharge rate. Furthermore, battery reliability must be considered. However, current battery reliability is relatively poor.

[0003] Summary of the Invention

[0004] The purpose of the embodiments of the present application is to provide a battery and an electrical device, which are intended to improve the problem of poor reliability of batteries in related technologies.

[0005] In the first aspect, an embodiment of the present application provides a battery cell, which includes a battery cell and a support member, the battery cell including a shell and a pressure relief component, the shell including a first wall portion, the pressure relief component is arranged on the first wall portion, the pressure relief component includes a first groove, and the pressure relief component is configured to be able to crack along the first groove when the battery cell releases pressure; the support member supports the first wall portion, the support member has a supporting surface facing the first wall portion, the supporting surface is provided with an avoidance portion, and along the thickness direction of the first wall portion, the projection of the first groove is located within the avoidance portion.

[0006] In the above technical solution, a pressure relief component is provided on the first wall portion of the battery cell. When the battery cell releases pressure, the pressure relief component can split along the first groove to allow the fluid medium in the battery cell to flow out and release pressure. The support member can support the battery cell. By providing a relief portion on the support member and positioning the projection of the first groove along the thickness direction of the first wall portion within the relief portion, the relief portion can avoid the first groove. When the battery cell releases pressure, the support member is unlikely to abut against the outside of the first groove, which is difficult to inhibit deformation of the pressure relief component and cracking of the first groove. This allows the first groove to split promptly when the battery cell releases pressure, which is beneficial to improving the timeliness of the battery cell pressure release and the reliability of the battery.

[0007] As an optional technical solution of an embodiment of the present application, the avoidance portion forms a first opening on the support surface, and the minimum distance between the projection of the first groove on the support surface along the thickness direction of the first wall portion and the edge of the first opening is A, satisfying: A≥3mm.

[0008] In the above technical solution, when the minimum distance between the projection of the first groove on the support surface along the thickness direction of the first wall and the edge of the first opening is greater than or equal to 3 mm, the first groove is farther from the edge of the first opening in a direction perpendicular to the thickness direction of the first wall, and the avoidance portion has a better avoidance effect on the first groove. During battery cell pressure relief, the support member is less likely to abut against the outside of the first groove, which is less likely to inhibit deformation of the pressure relief component and cracking of the first groove. This allows the first groove to promptly crack during battery cell pressure relief, thereby improving the timeliness of battery cell pressure relief and battery reliability. In addition, by ensuring that the minimum distance between the projection of the first groove on the support surface along the thickness direction of the first wall and the edge of the first opening is greater than or equal to 3 mm, the first opening of the avoidance portion is larger, which can absorb assembly errors and reduce assembly requirements.

[0009] As an optional technical solution of an embodiment of the present application, the first wall portion is a rectangular structure, and the minimum distance between the projection of the first groove along the thickness direction of the first wall portion on the support surface and the edge of the first opening in the length direction of the first wall portion is A1, and the minimum distance between the projection of the first groove along the thickness direction of the first wall portion on the support surface and the edge of the first opening in the width direction of the first wall portion is A2, satisfying: A=A2, A2<A1.

[0010] In the above technical solution, the minimum distance between the projection of the first groove on the support surface along the thickness direction of the first wall and the edge of the first opening in the width direction of the first wall is the minimum distance between the projection of the first groove on the support surface along the thickness direction of the first wall and the edge of the first opening. Furthermore, the minimum distance between the projection of the first groove on the support surface along the thickness direction of the first wall and the edge of the first opening in the length direction of the first wall is greater than the minimum distance between the projection of the first groove on the support surface along the thickness direction of the first wall and the edge of the first opening in the width direction of the first wall. In this way, the support member can further suppress deformation of the pressure relief component in the length direction of the first wall. The first wall portion is a rectangular structure, and the stiffness of the pressure relief component in the width direction of the first wall portion changes slightly, while the stiffness of the pressure relief component in the length direction of the first wall portion changes significantly. The deformation of the pressure relief component at the middle position in the length direction of the first wall portion is larger than the deformation of the pressure relief component at the edge position in the length direction of the first wall portion. The deformation of the pressure relief component at the middle position in the width direction of the first wall portion is smaller than the deformation of the pressure relief component at the edge position in the width direction of the first wall portion. By making the minimum distance between the projection of the first groove on the support surface along the thickness direction of the first wall portion and the edge of the first opening in the length direction of the first wall portion greater than the minimum distance between the projection of the first groove on the support surface along the thickness direction of the first wall portion and the edge of the first opening in the width direction of the first wall portion, the suppression of the deformation of the pressure relief component in the length direction of the first wall portion is reduced, so that the pressure relief component deforms more significantly when the battery cell is depressurized, so that the first groove can rupture more promptly when the battery cell is depressurized, which is beneficial to improving the timeliness of the pressure relief of the battery cell and improving the reliability of the battery.

[0011] As an optional technical solution of the embodiment of the present application, A1≥5mm.

[0012] In the above technical solution, when the minimum distance between the projection of the first groove along the thickness direction of the first wall portion on the support surface and the edge of the first opening along the length direction of the first wall portion is greater than or equal to 5 mm, the first groove is farther from the edge of the first opening along the length direction of the first wall portion, and the avoidance portion has a better avoidance effect on the first groove. When the battery cell is depressurized, the support member is less likely to abut against the outside of the first groove, which is less likely to suppress deformation of the pressure relief component and cracking of the first groove. This allows the first groove to crack promptly when the battery cell is depressurized, which is beneficial for improving the timeliness of the battery cell pressure relief and the reliability of the battery. In addition, by ensuring that the minimum distance between the projection of the first groove along the thickness direction of the first wall portion on the support surface and the edge of the first opening along the length direction of the first wall portion is greater than or equal to 5 mm, the avoidance portion has a larger dimension along the length direction of the first wall portion, which can absorb assembly errors and reduce assembly requirements.

[0013] As an optional technical solution of an embodiment of the present application, the difference between A1 and A2 is less than 10 mm.

[0014] In the above technical solution, by making the difference between A1 and A2 less than 10 mm, A1 and A2 are made closer, and the deformation suppression of the pressure relief component in the length direction of the first wall portion and the deformation suppression of the pressure relief component in the width direction of the first wall portion are both smaller, so that the pressure relief component is easier to deform in both the length direction and the width direction of the first wall portion, so that the first groove can be cracked more promptly when the battery cell is depressurized, which is beneficial to improving the timeliness of the pressure relief of the battery cell and improving the reliability of the battery.

[0015] As an optional technical solution of an embodiment of the present application, the first groove defines a predetermined pressure relief area, and the pressure relief component includes a second groove, which is configured to guide at least a portion of the predetermined pressure relief area to flip so as to open at least a portion of the predetermined pressure relief area; wherein, along the thickness direction of the first wall portion, the projection of the second groove is located within the avoidance portion.

[0016] In the above technical solution, by providing a second groove, the strength of the pressure relief component at the second groove position is weakened, making it easier for the predetermined pressure relief area to flip open under the action of the fluid medium. This not only increases the probability of the predetermined pressure relief area opening, but also increases the speed of the predetermined pressure relief area opening, achieving rapid pressure relief, reducing the risk of battery cell explosion and fire, and facilitating improved battery cell reliability. By providing an escape portion on the support member and positioning the projection of the second groove along the thickness direction of the first wall portion within the escape portion, the escape portion can avoid the second groove. When the battery cell is depressurized, the support member is less likely to abut against the outside of the predetermined pressure relief area, making it less likely to prevent the predetermined pressure relief area from flipping open. This allows the predetermined pressure relief area to flip open promptly when the battery cell is depressurized, facilitating improved battery cell depressurization timeliness and battery reliability.

[0017] As an optional technical solution of an embodiment of the present application, the avoidance portion forms a first opening on the support surface, and the minimum distance between the projection of the second groove on the support surface along the thickness direction of the first wall portion and the edge of the first opening is B, satisfying: B≥3mm.

[0018] In the above technical solution, when the minimum distance between the projection of the second groove on the support surface along the thickness direction of the first wall and the edge of the first opening is greater than or equal to 3 mm, the second groove is farther from the edge of the first opening in a direction perpendicular to the thickness direction of the first wall, and the avoidance portion has a better avoidance effect on the second groove. This makes it less likely that the support member will abut against the predetermined pressure relief area during battery cell pressure relief, and less likely to inhibit the predetermined pressure relief area from flipping over. This allows the predetermined pressure relief area to flip open promptly during battery cell pressure relief, thereby improving the timeliness of battery cell pressure relief and battery reliability. Furthermore, by ensuring that the minimum distance between the projection of the second groove on the support surface along the thickness direction of the first wall and the edge of the first opening is greater than or equal to 3 mm, the first opening of the avoidance portion is larger, which can absorb assembly errors and reduce assembly requirements.

[0019] As an optional technical solution of an embodiment of the present application, the first wall portion is a rectangular structure, the minimum distance between the projection of the second groove along the thickness direction of the first wall portion on the support surface and the edge of the first opening in the length direction of the first wall portion is B1, and the minimum distance between the projection of the second groove along the thickness direction of the first wall portion on the support surface and the edge of the first opening in the width direction of the first wall portion is B2, satisfying: B=B2, B2<B1.

[0020] In the above technical solution, the minimum distance between the projection of the second groove on the support surface along the thickness direction of the first wall and the edge of the first opening in the width direction of the first wall is the minimum distance between the projection of the second groove on the support surface along the thickness direction of the first wall and the edge of the first opening. Furthermore, the minimum distance between the projection of the second groove on the support surface along the thickness direction of the first wall and the edge of the first opening in the length direction of the first wall is greater than the minimum distance between the projection of the second groove on the support surface along the thickness direction of the first wall and the edge of the first opening in the width direction of the first wall. In this way, the support member can further suppress deformation of the pressure relief component in the length direction of the first wall. The first wall portion has a rectangular structure. The stiffness of the pressure relief component in the width direction of the first wall portion changes slightly, while the stiffness of the pressure relief component in the length direction of the first wall portion changes significantly. The deformation of the pressure relief component at the middle position in the length direction of the first wall portion changes significantly compared to the deformation at the edge positions in the length direction of the first wall portion. The deformation of the pressure relief component at the middle position in the width direction of the first wall portion changes slightly compared to the deformation at the edge positions in the width direction of the first wall portion. By making the minimum distance between the projection of the second groove on the support surface along the thickness direction of the first wall portion and the edge of the first opening in the length direction of the first wall portion greater than the minimum distance between the projection of the second groove on the support surface along the thickness direction of the first wall portion and the edge of the first opening in the width direction of the first wall portion, the suppression of the deformation of the pressure relief component in the length direction of the first wall portion is reduced, so that the pressure relief component deforms significantly when the battery cell releases pressure, allowing the predetermined pressure relief area to flip open in time when the battery cell releases pressure, which is beneficial to improving the timeliness of the pressure relief of the battery cell and improving the reliability of the battery.

[0021] As an optional technical solution of an embodiment of the present application, the first groove and the second groove are arranged along the width direction of the first wall portion, and the minimum distance between the projection of the first groove along the thickness direction of the first wall portion on the support surface and the edge of the first opening in the width direction of the first wall portion is A1, A1>B1.

[0022] In the above technical solution, in the width direction of the first wall portion, the second groove is closer to the edge of the first opening than the first groove. In this way, the support member is not easy to suppress the cracking of the first groove, so that the first groove can be cracked in time when the battery cell is depressurized.

[0023] As an optional technical solution of an embodiment of the present application, along the width direction of the first wall portion, the projection of the second groove on the support surface is located between the projection of the first groove on the support surface and the edge of the first opening.

[0024] In the above technical solution, by making the projection of the second groove on the support surface between the projection of the first groove on the support surface and the edge of the first opening, in the width direction of the first wall portion, the first groove is farther away from the edge of the first opening than the second groove. In this way, the support member is less likely to suppress the cracking of the first groove, so that the first groove can crack in time when the battery cell is depressurized.

[0025] As an optional technical solution of the embodiment of the present application, the second grooves are provided on both sides of the first groove along the width direction of the first wall portion.

[0026] In the above technical solution, by arranging second grooves on both sides of the first groove along the width direction of the first wall portion, predetermined pressure relief areas are respectively defined on both sides of the first groove along the width direction of the first wall portion. When the battery cell releases pressure, the two predetermined pressure relief areas are flipped open under the guidance of their corresponding second grooves, so that the battery cell has a larger pressure relief area, which is beneficial to improving the pressure relief rate of the battery cell and improving the reliability of the battery cell.

[0027] As an optional technical solution of an embodiment of the present application, the pressure relief component has a first surface and a second surface arranged opposite to each other in the thickness direction of the first wall portion, the first groove is arranged on the first surface, and the second groove is arranged on the second surface.

[0028] In the above technical solution, the first groove and the second groove are respectively arranged on the first surface and the second surface of the pressure relief component, so that the first groove and the second groove are respectively located on both sides of the pressure relief component, thereby facilitating the processing of the first groove and the second groove on both sides of the pressure relief component, which is beneficial to reducing the mutual influence of the first groove and the second groove during the processing.

[0029] As an optional technical solution of an embodiment of the present application, the first surface is the surface of the pressure relief component facing away from the interior of the shell, and the second surface is the surface of the pressure relief component facing the interior of the shell.

[0030] In the above technical solution, by arranging the first groove on the surface of the pressure relief component facing away from the interior of the housing, the tension required to be overcome by the first groove when cracking is reduced, making it easier to crack. By arranging the second groove on the surface of the pressure relief component facing the interior of the housing, the tension required to be overcome by the predetermined pressure relief area when flipping is reduced, thereby facilitating the rapid flipping and opening of the predetermined pressure relief area, which is beneficial for improving the reliability of the battery cell.

[0031] As an optional technical solution of an embodiment of the present application, the first groove includes a first groove section, a second groove section and a third groove section, the first groove section and the third groove section are arranged opposite to each other, the second groove section connects the first groove section and the third groove section, and the first groove section, the second groove section and the third groove section define the predetermined pressure relief area.

[0032] In the above technical solution, the first groove includes a first groove section, a second groove section and a third groove section, and the second groove section connects the first groove section and the third groove section, so that the pressure relief component can split along the first groove section, the second groove section and the third groove section when the battery cell releases pressure, so as to open the predetermined pressure relief area to release the internal pressure of the battery cell. The first groove with this structure makes the connection position between the first groove section and the second groove section and the connection position between the first groove section and the third groove section weaker, easier to split and open the predetermined pressure relief area for pressure relief, and can further improve the pressure relief area and pressure relief rate of the battery cell.

[0033] As an optional technical solution of an embodiment of the present application, the first groove defines two predetermined pressure relief areas, and the two predetermined pressure relief areas are respectively located on both sides of the second groove section, and at least one second groove is correspondingly provided for each predetermined pressure relief area.

[0034] In the above technical solution, the first groove defines two predetermined pressure relief areas, and each predetermined pressure relief area is correspondingly provided with at least one second groove. When the battery cell releases pressure, the two predetermined pressure relief areas are flipped open under the guidance of their corresponding second grooves, so that the battery cell has a larger pressure relief area, which is beneficial to improving the pressure relief rate of the battery cell and improving the reliability of the battery cell.

[0035] As an optional technical solution of the embodiment of the present application, each of the predetermined pressure relief areas is correspondingly provided with a second groove, and the first groove is located between two second grooves.

[0036] In the above technical solution, the predetermined pressure relief areas correspond one-to-one with the second grooves, which can reduce the number of second grooves provided, reduce the number of times the pressure relief component needs to be processed, and reduce the stress on the pressure relief component. By arranging the first groove between the two second grooves, when the battery cell releases pressure, the pressure relief component can split along the first groove section, the second groove section, and the third groove section, thereby opening the two predetermined pressure relief areas. The two predetermined pressure relief areas are then flipped open under the guidance of their corresponding second grooves, giving the battery cell a larger pressure relief area, which is beneficial for improving the pressure relief rate of the battery cell and enhancing the reliability of the battery cell.

[0037] As an optional technical solution of an embodiment of the present application, the position where the second slot segment is connected to the first slot segment deviates from the two ends of the first slot segment, and the position where the second slot segment is connected to the third slot segment deviates from the two ends of the third slot segment.

[0038] In the above technical solution, by setting the connection position between the second groove segment and the first groove segment to be located between the two ends of the second groove segment, and setting the connection position between the second groove segment and the third groove segment to be located between the two ends of the third groove segment, so that the first groove segment, the second groove segment and the third groove segment form a structure similar to an "H" shape, so that predetermined pressure relief areas can be formed on both sides of the second groove segment of the first groove, and the two predetermined pressure relief areas can be opened in a split manner to relieve pressure when the battery cell is depressurized, which is beneficial to further increase the pressure relief effect of the battery cell and can effectively improve the pressure relief rate of the battery cell.

[0039] As an optional technical solution of an embodiment of the present application, the first slot segment, the second slot segment and the third slot segment are all spaced apart from the second groove.

[0040] In the above technical solution, by arranging the first groove section, the second groove section and the third groove section to be spaced apart from the second groove, on the one hand, the mutual influence between the first groove and the second groove during the processing can be reduced; on the other hand, the phenomenon that the pressure relief component cracks along the second groove when the pressure relief component cracks along the first groove to relieve pressure can be reduced, and the stress influence between the area where the first groove of the pressure relief component is set and the area where the second groove of the pressure relief component is set can be reduced.

[0041] As an optional technical solution of an embodiment of the present application, the second slot segment and the second groove are arranged opposite to each other along a first direction, and along the first direction, the first slot segment and the third slot segment are both arranged spaced apart from the second groove.

[0042] In the above technical solution, by arranging the second slot segment and the second groove relative to each other along the first direction, the first slot segment and the third slot segment are both spaced apart from the second groove in the first direction, so that the predetermined pressure relief area defined by the first slot segment, the second slot segment and the third slot segment can be flipped around the area of ​​the pressure relief component where the second groove is provided when the pressure relief component is opened, and the flipping angle of the predetermined pressure relief area after being opened can be increased, thereby increasing the pressure relief area of ​​the battery cell.

[0043] As an optional technical solution of an embodiment of the present application, the first wall portion is a rectangular structure, and the first direction is parallel to the width direction of the first wall portion.

[0044] In the above technical solution, the second slot segment and the second groove are arranged along the width of the first wall. Along the width of the first wall, both the first and third slot segments are spaced apart from the second groove. The first slot segment has a larger width, making it easier to machine the first and second grooves. Furthermore, during production, the detonation pressure of multiple battery cells produced is relatively consistent.

[0045] As an optional technical solution of an embodiment of the present application, the pressure relief component has a first surface and a second surface arranged opposite to each other in the thickness direction of the first wall portion, and the first groove includes a multi-level groove arranged in sequence along the direction from the first surface to the second surface. In the two adjacent levels of the grooves, the first-level groove away from the first surface is arranged at the groove bottom surface of the first-level groove close to the first surface.

[0046] In the above technical solution, the multi-level grooves are sequentially arranged on the pressure relief component along the direction from the first surface to the second surface. During molding, the multi-level grooves can be formed step by step, thereby reducing the molding force on the pressure relief component and reducing the risk of cracks in the pressure relief component. The pressure relief component is not likely to fail due to cracks in the position where the grooves are set, thereby improving the reliability of the battery cell. When forming the multi-level grooves, stamping or cold heading can be used, so that the groove wall will undergo cold work hardening (the grain arrangement changes, resulting in lattice distortion, reducing the plasticity of the metal and increasing the hardness of the material), and its ability to resist external impact is enhanced, and it is not easily damaged by external impact. This is conducive to reducing the risk of leakage in the pressure relief component.

[0047] As an optional technical solution of the embodiment of the present application, the battery cell includes an electrode terminal, and the electrode terminal is provided on other walls of the housing except the first wall portion.

[0048] In the above technical solution, the electrode terminals and the pressure relief component are respectively arranged on different walls of the shell. When the battery cell is depressurized, the ejected fluid medium is not likely to act on the electrode terminals and cause the electrode terminals to short-circuit, thereby reducing the risk of short circuit when the battery cell is depressurized.

[0049] As an optional technical solution of the embodiment of the present application, the electrode terminal is arranged on the wall of the shell opposite to the first wall portion.

[0050] In the above technical solution, the electrode terminal is arranged on the wall of the shell opposite to the first wall, and the electrode terminal is far away from the pressure relief component. When the battery cell is depressurized, the ejected fluid medium is less likely to act on the electrode terminal and cause the electrode terminal to short-circuit, further reducing the risk of short circuit when the battery cell is depressurized.

[0051] As an optional technical solution of an embodiment of the present application, the outer shell includes a shell and an end cover, the shell has a second opening; the end cover is connected to the shell and closes the second opening; wherein, the end cover is the first wall portion, or the shell includes the first wall portion.

[0052] In the above technical solution, when the end cap is the first wall portion, the pressure relief component is disposed on the end cap, which simplifies and facilitates manufacturing. When the housing includes the first wall portion, the pressure relief component is disposed on one wall of the housing. The fluid medium ejected by the pressure relief component is less likely to act on other electrical connection structures on the end cap, thereby reducing the risk of short circuits in the battery cells.

[0053] As an optional technical solution of the embodiment of the present application, the avoidance portion is a through hole or a groove provided on the support member.

[0054] In the above technical solution, a through hole or a groove is formed on the support member as the avoidance portion, which is simple, convenient and easy to manufacture.

[0055] As an optional technical solution of the embodiment of the present application, the avoidance portion corresponds one-to-one to the pressure relief component.

[0056] In the above technical solution, by aligning the relief portions with the pressure relief components one-to-one, a relief effect is achieved for each pressure relief component, allowing smooth pressure relief for each battery cell, thereby improving battery reliability. Furthermore, since the relief portions correspond one-to-one with the pressure relief components, each relief portion can be smaller, and the structure remaining between two adjacent relief portions can be considered a reinforcing rib, thus providing greater strength to the support member.

[0057] As an optional technical solution of the embodiment of the present application, at least one of the avoidance portions is provided corresponding to the pressure relief components of the plurality of battery cells.

[0058] In the above technical solution, a single relief portion can correspond to the pressure relief components of multiple battery cells. The structure remaining between two adjacent relief portions can be considered a reinforcing rib, providing greater strength to the support member. Furthermore, a single relief portion can be larger, accommodating assembly tolerances and reducing assembly requirements.

[0059] As an optional technical solution of the embodiment of the present application, the battery includes multiple rows of battery cells, and one avoidance portion is provided corresponding to the pressure relief components of at least two battery cells in a row of battery cells.

[0060] In the above technical solution, the battery includes multiple rows of battery cells. Correspondingly, the avoidance parts can also be set in multiple rows. The number of avoidance parts is less than the number of battery cells, so that one avoidance part can correspond to the pressure relief component setting of at least two battery cells in a row of battery cells.

[0061] As an optional technical solution of the embodiment of the present application, the battery includes multiple rows of battery cells, and one avoidance portion is provided corresponding to the pressure relief component of a row of battery cells.

[0062] In the above technical solution, the battery includes multiple rows of battery cells. Correspondingly, the avoidance parts are also arranged in multiple rows. One avoidance part is arranged corresponding to the pressure relief component of a row of battery cells. This is conducive to absorbing assembly tolerances and reducing assembly requirements.

[0063] As an optional technical solution of an embodiment of the present application, the support member is connected to the first wall portion via an adhesive layer.

[0064] In the above technical solution, the support member is bonded and fixed to the wall portion, which enables the battery cell to be stably connected to the support member, reducing the risk of the battery cell being separated from the support member during use, and has low assembly difficulty and low cost.

[0065] As an optional technical solution of the embodiment of the present application, the avoidance portion forms a first opening on the support surface, and there is a gap between the adhesive layer and the edge of the first opening.

[0066] In the above technical solution, by providing a gap between the adhesive layer and the edge of the first opening, the adhesive layer is arranged around the outside of the first opening, so that the adhesive layer is not easily inhibited from deforming the pressure relief component and cracking the first groove, so that the first groove can be cracked in time when the battery cell is depressurized, which is beneficial to improving the timeliness of the pressure relief of the battery cell and improving the reliability of the battery.

[0067] As an optional technical solution of an embodiment of the present application, the battery includes an electrical cavity and an exhaust cavity. Along the thickness direction of the first wall portion, the electrical cavity and the exhaust cavity are located on both sides of the support member. The electrical cavity is used to accommodate the battery cell, and the exhaust cavity is used to guide gas circulation when the battery cell is depressurized.

[0068] In the above technical solution, an electrical cavity is provided to accommodate the battery cell, and an exhaust cavity is provided to discharge the fluid medium. The electrical cavity and the exhaust cavity are respectively provided on both sides of the support member, so that the discharged fluid medium is not likely to act on the battery cell in the electrical cavity, and is not likely to cause a short circuit in the battery cell, which is beneficial to improving the reliability of the battery.

[0069] As an optional technical solution of an embodiment of the present application, the support member is configured to be able to perform thermal management on the battery cell.

[0070] In the above technical solution, the support member can also perform thermal management on the battery cell to control the temperature of the battery cell within an appropriate range, which is conducive to the battery cell to perform its performance. A single support member can perform multiple functions, which is conducive to simplifying the battery structure.

[0071] As an optional technical solution of the embodiment of the present application, the minimum thickness of the area of ​​the support member other than the avoidance portion is greater than the maximum thickness of the first wall portion.

[0072] In the above technical solution, by making the minimum thickness of the support member except the avoidance portion greater than the maximum thickness of the first wall portion, the thickness of the support member is large and the support member has sufficient strength to stably support the battery cell.

[0073] In a second aspect, an embodiment of the present application further provides an electrical device, which includes the above-mentioned battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0074] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0075] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0076] FIG2 is an exploded view of the structure of a battery provided in some embodiments of the present application;

[0077] FIG3 is a schematic structural diagram of a battery cell and a support member provided in some embodiments of the present application;

[0078] FIG4 is a cross-sectional view of a battery cell and a support member provided in some embodiments of the present application;

[0079] FIG5 is an enlarged view of position A in FIG4 ;

[0080] FIG6 is a bottom view schematic diagram of a battery cell and a support member provided in some embodiments of the present application;

[0081] FIG7 is an enlarged view of position B in FIG6 ;

[0082] FIG8 is a schematic structural diagram of a battery cell provided in some embodiments of the present application;

[0083] FIG9 is an exploded view of a battery cell provided in some embodiments of the present application;

[0084] FIG10 is a schematic structural diagram of a battery cell and a support member provided in other embodiments of the present application;

[0085] FIG11 is a cross-sectional view of a battery cell and a support member provided in some other embodiments of the present application;

[0086] FIG12 is a schematic structural diagram of a battery cell and a support member provided in some other embodiments of the present application;

[0087] FIG13 is a cross-sectional view of a battery cell and a support member provided in some other embodiments of the present application;

[0088] FIG14 is a cross-sectional view of a battery cell and a support member provided in some further embodiments of the present application.

[0089] Icons: 1000-vehicle; 100-battery; 10-casing; 11-first casing body; 12-second casing body; 20-battery cell; 21-casing; 211-first wall; 212-pressure relief component; 2121-first groove; 21211-predetermined pressure relief area; 2121a-first groove section; 2121b-second groove section; 2121c-third groove section; 2121d-fourth groove section; 2122-first surface; 2123-second surface; 2124-second groove; 213-end cover; 214-casing; 2141-second opening; 22-electrode assembly; 23-electrode terminal; 24-current collecting member; 30-support member; 31-support surface; 32-avoidance portion; 321-first opening; 40-adhesive layer; 50-electrical cavity; 60-exhaust cavity; 200-controller; 300-motor. DETAILED DESCRIPTION

[0090] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0091] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0092] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0093] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0094] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0095] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0096] The term "plurality" used in this application refers to two or more (including two).

[0097] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0098] The battery cells can be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc., which are not limited in the embodiments of the present application.

[0099] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are inserted and removed between the positive and negative electrodes. The separator, placed between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing the active ions to pass through.

[0100] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0101] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0102] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0103] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include but are not limited to at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include but are not limited to lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also referred to as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05O2) and at least one of its modified compounds, etc.

[0104] In some embodiments, a positive electrode may utilize a metal foam. The metal foam may include nickel foam, copper foam, aluminum foam, alloy foam, or the like. When a metal foam is used as the positive electrode, the surface of the metal foam may or may not include a positive electrode active material. For example, a lithium source material, potassium metal, or sodium metal may be filled or / and deposited within the metal foam, where the lithium source material is lithium metal and / or a lithium-rich material.

[0105] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0106] As an example, the negative electrode current collector may be a metal foil, a metal foam, or a composite current collector. For example, as the metal foil, aluminum or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrode, nickel, or titanium, etc. may be used. The metal foam may be nickel foam, copper foam, aluminum foam, alloy foam, etc. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0107] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0108] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is provided on either or both of the two facing surfaces of the negative electrode current collector.

[0109] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells that is well known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0110] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0111] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0112] In some embodiments, the separator is a separator membrane. There are many types of separator membranes, and any known separator membrane with a porous structure having good chemical stability and mechanical stability can be selected.

[0113] As an example, the separator can be made of at least one of fiberglass, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator can be a single-layer film or a multi-layer composite film. In the case of a multi-layer composite film, the materials of each layer can be the same or different. The separator can be a separate component positioned between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0114] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0115] In some embodiments, the battery cell further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel, or solid. Liquid electrolytes include an electrolyte salt and a solvent.

[0116] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonyl imide, lithium bistrifluoromethanesulfonyl imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium bisoxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0117] In some embodiments, the solvent may include at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methylpropyl carbonate, ethylpropyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent may also be an ether solvent. The ether solvent may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.

[0118] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0119] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0120] As an example, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, polyionic liquid-lithium salt, cellulose, or the like.

[0121] As an example, the inorganic solid electrolyte may include an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0122] As an example, a composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0123] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0124] In some embodiments, the electrode assembly is a laminate structure.

[0125] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be provided respectively, and the multiple positive electrode sheets and the multiple negative electrode sheets can be alternately stacked.

[0126] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0127] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded segments.

[0128] As an example, a plurality of separators may be provided, each of which is disposed between any adjacent positive electrode sheets or negative electrode sheets.

[0129] As an example, the separator may be provided continuously, and may be provided between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0130] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0131] In some embodiments, the electrode assembly is provided with tabs that can conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0132] In some embodiments, a battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (e.g., polypropylene), a composite metal housing (e.g., a copper-aluminum composite housing), or an aluminum-plastic film.

[0133] As an example, the battery cells may be cylindrical, prismatic, soft-pack or other shaped battery cells. Prismatic battery cells include but are not limited to square-shell, blade-shaped, and polygonal batteries, such as hexagonal batteries.

[0134] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0135] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0136] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are housed in the case.

[0137] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0138] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0139] Batteries are widely used in new energy applications, such as electric vehicles and new energy vehicles. These have become a new trend in the automotive industry. The development of battery technology requires consideration of multiple design factors, including performance parameters such as battery life, energy density, discharge capacity, and charge / discharge rate. Furthermore, battery reliability must be considered. However, current battery reliability is relatively poor.

[0140] For battery cells, in order to improve the reliability of battery cells, the existing technology is to weld a pressure relief mechanism on the battery cells. The pressure relief mechanism opens when the internal pressure of the battery cells reaches the detonation pressure to release the pressure inside the battery cells, thereby reducing the risk of battery cell explosion and fire.

[0141] However, when the battery cell is placed in the box, the pressure relief mechanism is supported by the support member, which suppresses the deformation of the pressure relief mechanism, resulting in the pressure relief mechanism being unable to open or opening slowly, and unable to quickly release the pressure inside the battery cell, so that the battery cell still has a greater risk of explosion and fire, resulting in poor reliability of the battery cell.

[0142] In view of this, an embodiment of the present application provides a battery cell, comprising a battery cell and a support member. The battery cell includes a housing and a pressure relief member, wherein the housing includes a first wall portion, and the pressure relief member is disposed on the first wall portion. The pressure relief member includes a first groove, and the pressure relief member is configured to break along the first groove when the battery cell releases pressure. The support member supports the first wall portion, and the support member has a support surface facing the first wall portion, and the support surface is provided with an escape portion. Along the thickness direction of the first wall portion, the projection of the first groove is located within the escape portion.

[0143] A pressure relief component is provided on the first wall portion of the battery cell. When the battery cell releases pressure, the pressure relief component can split along the first groove to allow the fluid medium in the battery cell to flow out and release pressure. The support member can support the battery cell. By providing a relief portion on the support member and positioning the projection of the first groove along the thickness direction of the first wall portion within the relief portion, the relief portion can avoid the first groove. When the battery cell releases pressure, the support member is unlikely to abut against the outside of the first groove, which is difficult to suppress deformation of the pressure relief component and cracking of the first groove. This allows the first groove to split promptly when the battery cell releases pressure, which is beneficial to improving the timeliness of the battery cell pressure relief and the reliability of the battery.

[0144] The battery disclosed in the embodiments of the present application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. The battery disclosed in the present application can be used to form a power supply system for the electrical device, which is beneficial to improving the reliability of the battery cell.

[0145] The present invention provides an electric device that uses a battery as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0146] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device according to an embodiment of the present application.

[0147] Please refer to Figure 1, which is a structural schematic diagram of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000. The battery 100 can be arranged at the bottom of the vehicle 1000, or at the head of the vehicle 1000, or at the tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can be used as an operating power source or a power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0148] In some embodiments of the present application, the battery 100 can not only serve as the operating power source or usage power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0149] Please refer to Figure 2, which is an exploded view of the structure of a battery 100 provided in some embodiments of the present application. The battery 100 includes a housing 10 and a battery cell 20, wherein the battery cell 20 is accommodated in the housing 10.

[0150] The housing 10 is used to provide assembly space for the battery cells 20 and can adopt a variety of structures. In some embodiments, the housing 10 can include a first housing body 11 and a second housing body 12. The first housing body 11 and the second housing body 12 cover each other, and the first housing body 11 and the second housing body 12 jointly define an assembly space for accommodating the battery cells 20. The second housing body 12 can be a hollow structure with one end open, and the first housing body 11 can be a plate-like structure. The first housing body 11 covers the open side of the second housing body 12, so that the first housing body 11 and the second housing body 12 jointly define the assembly space. The first housing body 11 and the second housing body 12 can also be hollow structures with one end open, and the open side of the first housing body 11 covers the open side of the second housing body 12.

[0151] Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder, a cuboid or a cube, etc. For example, in FIG2 , the box body 10 is in the shape of a cuboid.

[0152] In the battery 100, there can be one or more battery cells 20 disposed within the housing 10. When there are multiple battery cells 20 disposed within the housing 10, the multiple battery cells 20 can be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel configurations within the multiple battery cells 20. The multiple battery cells 20 can be directly connected in series, in parallel, or in a hybrid configuration, and then the entire battery cell 20 can be housed within the housing 10. Alternatively, the battery 100 can be constructed by first connecting multiple battery cells 20 in series, in parallel, or in a hybrid configuration to form a battery module. The multiple battery modules can then be connected in series, in parallel, or in a hybrid configuration to form a single unit, which is then housed within the housing 10.

[0153] In some embodiments, the battery 100 may further include other structures. For example, the battery 100 may further include a busbar component, which is used to connect the multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20 .

[0154] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 can be in the form of a cuboid, a cylinder, a prism, or other shapes. For example, the battery cell 20 is a cuboid.

[0155] Please refer to Figures 3, 4, 5, 6, 7, 8 and 9. Figure 3 is a schematic structural diagram of the battery cell 20 and the support member 30 provided in some embodiments of the present application. Figure 4 is a cross-sectional view of the battery cell 20 and the support member 30 provided in some embodiments of the present application. Figure 5 is an enlarged view of position A in Figure 4. Figure 6 is a bottom-up schematic diagram of the battery cell 20 and the support member 30 provided in some embodiments of the present application. Figure 7 is an enlarged view of position B in Figure 6. Figure 8 is a schematic structural diagram of the battery cell 20 provided in some embodiments of the present application. Figure 9 is an exploded view of the battery cell 20 provided in some embodiments of the present application. An embodiment of the present application provides a battery cell 20, and the battery cell 20 includes a battery cell 20 and a support member 30. The battery cell 20 includes a shell 21 and a pressure relief component 212. The shell 21 includes a first wall portion 211, and the pressure relief component 212 is arranged on the first wall portion 211. The pressure relief component 212 includes a first groove 2121 and is configured to rupture along the first groove 2121 when pressure is released from the battery cell 20. A support member 30 supports the first wall 211 and has a support surface 31 facing the first wall 211. The support surface 31 is provided with a relief portion 32. Along the thickness direction of the first wall 211, the projection of the first groove 2121 is located within the relief portion 32.

[0156] The battery cell 20 refers to the smallest unit constituting the battery 100 .

[0157] The housing 21 includes an end cover 213 and a shell 214 . The shell 214 has a second opening 2141 . The end cover 213 is connected to the shell 214 and closes the second opening 2141 .

[0158] The end cap 213 refers to a component that covers the second opening 2141 of the shell 214 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 213 can be adapted to the shape of the shell 214 to match the shell 214. Optionally, the end cap 213 can be made of a material with a certain hardness and strength (such as an aluminum alloy). In this way, the end cap 213 is not easily deformed when squeezed or collided, so that the battery cell 20 can have a higher structural strength and improved safety performance. The material of the end cap 213 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application are not particularly limited to this. In some embodiments, the battery cell 20 also includes an insulating member, which is arranged on the inner side of the end cap 213. The insulating member can be used to isolate the electrical connection components in the shell 214 from the end cap 213 to reduce the risk of short circuit. Exemplary, the insulating member can be plastic, rubber, etc.

[0159] The housing 214 is a component that cooperates with the end cap 213 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 22, electrolyte, and other components. The housing 214 and the end cap 213 can be independent components. A second opening 2141 can be provided on the housing 214, and the end cap 213 is closed at the second opening 2141 to form the internal environment of the battery cell 20. Alternatively, the end cap 213 and the housing 214 can be integrated. Specifically, the end cap 213 and the housing 214 can form a common joint surface before other components are inserted into the housing. When the interior of the housing 214 needs to be encapsulated, the end cap 213 is closed to the housing 214. The housing 214 can have a variety of shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the housing 214 can be determined based on the specific shape and size of the electrode assembly 22. The shell 214 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0160] The electrode assembly 22 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 22 may be contained in the housing 21. The electrode assembly 22 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly 22, and the parts of the positive and negative electrode sheets without active materials each constitute a tab. The positive and negative electrode tabs may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery 100, the positive electrode active material and the negative electrode active material react with the electrolyte.

[0161] The first wall portion 211 may be the end cap 213 of the housing 21, or may be a wall of the shell 214 of the housing 21. For example, in Figures 8 and 9, the first wall portion 211 is the bottom wall of the shell 214, which is disposed opposite the end cap 213. In other embodiments, the first wall portion 211 may also be a side wall of the shell 214, which is adjacent to and connected to the end cap 213.

[0162] The pressure relief component 212 can be a component mounted on the first wall portion 211. In this case, the pressure relief component 212 is separately mounted and connected to the first wall portion 211. For example, the pressure relief component 212 is a burst-proof disk mounted on the first wall portion 211. The pressure relief component 212 can also be a portion of the first wall portion 211. In this case, the pressure relief component 212 and the first wall portion 211 are integrally formed. The location of the pressure relief component 212 can be used to determine which wall of the housing 21 is the first wall portion 211. For example, when the pressure relief component 212 is mounted on the end cap 213, the end cap 213 is the first wall portion 211. When the pressure relief component 212 is mounted on the bottom wall of the housing 214, the bottom wall is the first wall portion 211. When the pressure relief component 212 is mounted on a side wall of the housing 214, the side wall is the first wall portion 211.

[0163] The first groove 2121 serves to release pressure, and is used to enable the pressure relief member 212 to rupture along the first groove 2121 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value, so as to release the pressure inside the battery cell 20 .

[0164] Optionally, the first groove 2121 can be arranged on the side of the pressure relief component 212 facing the interior of the shell 21, or can be arranged on the side of the pressure relief component 212 facing away from the interior of the shell 21. For example, in Figures 4 and 5, the first groove 2121 is arranged on the side of the pressure relief component 212 facing away from the interior of the shell 21, that is, the first groove 2121 is arranged on the surface of the side of the pressure relief component 212 facing away from the interior of the shell 21.

[0165] The support member 30 is a component used to support the first wall portion 211. In some embodiments, the support member 30 may be a bottom support plate disposed at the bottom of the battery cell 20, which supports the first wall portion 211 of the battery cell 20. In other embodiments, the support member 30 may be a portion of the housing 10, for example, the support member 30 may be the bottom wall of the housing 10, which supports the first wall portion 211 of the battery cell 20. In still other embodiments, the support member 30 may be a thermal management component, for example, a water-cooled plate, which supports the first wall portion 211 of the battery cell 20.

[0166] The support surface 31 is the surface of the support member 30 facing the first wall portion 211 . The support surface 31 may be directly supported on the first wall portion 211 , or indirectly supported on the first wall portion 211 via an intermediate component.

[0167] The relief portion 32 is a structure for avoiding the first groove 2121. The relief portion 32 is provided on the support member 30. Specifically, the relief portion 32 is provided on the support surface 31 of the support member 30. In some embodiments, the relief portion 32 is a through hole that passes through the support surface 31 and the surface of the support member 30 opposite the support surface 31. In other embodiments, the relief portion 32 is a groove that is recessed from the support surface 31 in a direction away from the first wall portion 211.

[0168] 3 , 4 and 5 , the thickness direction of the first wall portion 211 may be the X direction shown in the figures.

[0169] The relief portion 32 is formed with a first opening 321 on the support surface 31. The phrase "along the thickness direction of the first wall portion 211, the projection of the first groove 2121 is located within the relief portion 32" can also be understood as: the projection of the first groove 2121 on the support surface 31 along the thickness direction of the first wall portion 211 is located within the first opening 321.

[0170] A pressure relief member 212 is provided on the first wall portion 211 of the battery cell 20. When the battery cell 20 releases pressure, the pressure relief member 212 can rupture along the first groove 2121, allowing the fluid medium in the battery cell 20 to flow out and release pressure. The support member 30 can support the battery cell 20. By providing a relief portion 32 on the support member 30 and positioning the projection of the first groove 2121 along the thickness direction of the first wall portion 211 within the relief portion 32, the relief portion 32 can avoid the first groove 2121. When the battery cell 20 releases pressure, the support member 30 is unlikely to abut against the outside of the first groove 2121, which can prevent deformation of the pressure relief member 212 and cracking of the first groove 2121. This allows the first groove 2121 to rupture promptly when the battery cell 20 releases pressure, thereby improving the timeliness of the pressure relief of the battery cell 20 and the reliability of the battery 100.

[0171] 3, 4, 5, 6 and 7, the avoidance portion 32 forms a first opening 321 on the support surface 31. The minimum distance A between the projection of the first groove 2121 along the thickness direction of the first wall portion 211 on the support surface 31 and the edge of the first opening 321 satisfies: A ≥ 3 mm.

[0172] The avoidance portion 32 has a peripheral wall, which intersects with the support surface 31 to form an edge line, and the edge line encloses the first opening 321 .

[0173] A represents the minimum distance between the projection of the first groove 2121 on the support surface 31 along the thickness direction of the first wall portion 211 and the edge of the first opening 321 (ie, the aforementioned edge line).

[0174] The minimum distance between the projection of the first groove 2121 on the support surface 31 along the thickness direction of the first wall portion 211 and the edge of the first opening 321 can be: A = 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, etc.

[0175] When the minimum distance between the projection of the first groove 2121 on the support surface 31 along the thickness direction of the first wall portion 211 and the edge of the first opening 321 is greater than or equal to 3 mm, in the direction perpendicular to the thickness direction of the first wall portion 211, the first groove 2121 is farther away from the edge of the first opening 321, and the avoidance effect of the avoidance portion 32 on the first groove 2121 is better. When the battery cell 20 is depressurized, the support member 30 is less likely to abut against the outside of the first groove 2121, and it is less likely to suppress the deformation of the pressure relief component 212 and the cracking of the first groove 2121, so that the first groove 2121 can crack in time when the battery cell 20 is depressurized, which is beneficial to improving the timeliness of the pressure relief of the battery cell 20 and improving the reliability of the battery 100. In addition, by ensuring that the minimum distance between the projection of the first groove 2121 on the support surface 31 along the thickness direction of the first wall portion 211 and the edge of the first opening 321 is greater than or equal to 3 mm, the first opening 321 of the avoidance portion 32 is larger, which can absorb assembly errors and has lower assembly requirements.

[0176] 3, 4, 5, 6, and 7, in some embodiments, the first wall portion 211 is a rectangular structure. The minimum distance between the projection of the first groove 2121 along the thickness direction of the first wall portion 211 on the support surface 31 and the edge of the first opening 321 in the length direction of the first wall portion 211 is A1, and the minimum distance between the projection of the first groove 2121 along the thickness direction of the first wall portion 211 on the support surface 31 and the edge of the first opening 321 in the width direction of the first wall portion 211 is A2, satisfying the following: A = A2, A2 < A1.

[0177] 7 , the length direction of the first wall portion 211 may be the Y direction shown in the figure, and the width direction of the first wall portion 211 may be the Z direction shown in the figure.

[0178] Along the length of the first wall portion 211, the first opening 321 has a first short side and a second short side that are oppositely disposed. The minimum distance between the projection of the first groove 2121 along the thickness direction of the first wall portion 211 on the support surface 31 and the first short side is a first distance, and the minimum distance between the projection of the first groove 2121 along the thickness direction of the first wall portion 211 on the support surface 31 and the second short side is a second distance. A1 represents the minimum of the first and second distances.

[0179] Along the width direction of the first wall portion 211, the first opening 321 has a first long side and a second long side that are oppositely disposed. The first long side, the first short side, the second long side, and the second short side are connected end to end. The minimum distance between the projection of the first groove 2121 on the support surface 31 along the thickness direction of the first wall portion 211 and the first long side is a third distance. The minimum distance between the projection of the first groove 2121 on the support surface 31 along the thickness direction of the first wall portion 211 and the second long side is a fourth distance. A2 represents the minimum distance between the third and fourth distances.

[0180] A=A2, that is, the minimum distance between the projection of the first groove 2121 on the support surface 31 along the thickness direction of the first wall portion 211 and the edge of the first opening 321 in the width direction of the first wall portion 211 is the minimum distance between the projection of the first groove 2121 on the support surface 31 along the thickness direction of the first wall portion 211 and the edge of the first opening 321.

[0181] A2<A1, that is, the minimum distance between the projection of the first groove 2121 on the support surface 31 along the thickness direction of the first wall portion 211 and the edge of the first opening 321 in the width direction of the first wall portion 211 is smaller than the minimum distance between the projection of the first groove 2121 on the support surface 31 along the thickness direction of the first wall portion 211 and the edge of the first opening 321 in the length direction of the first wall portion 211.

[0182] The minimum distance between the projection of the first groove 2121 on the support surface 31 along the thickness direction of the first wall portion 211 and the edge of the first opening 321 in the length direction of the first wall portion 211 is greater than the minimum distance between the projection of the first groove 2121 on the support surface 31 along the thickness direction of the first wall portion 211 and the edge of the first opening 321 in the width direction of the first wall portion 211. In this way, the support member 30 has a smaller effect on suppressing the deformation of the pressure relief component 212 in the length direction of the first wall portion 211. The first wall portion 211 is a rectangular structure. The stiffness of the pressure relief component 212 in the width direction of the first wall portion 211 changes slightly, and the stiffness of the pressure relief component 212 in the length direction of the first wall portion 211 changes significantly. The deformation of the pressure relief component 212 at the middle position in the length direction of the first wall portion 211 changes significantly compared to the deformation of the pressure relief component 212 at the edge position in the length direction of the first wall portion 211. The deformation of the pressure relief component 212 at the middle position in the width direction of the first wall portion 211 changes slightly compared to the deformation of the pressure relief component 212 at the edge position in the width direction of the first wall portion 211. By making the first groove 2121 along the thickness of the first wall portion 211 The minimum distance between the projection of the first groove 2121 on the support surface 31 along the thickness direction of the first wall portion 211 and the edge of the first opening 321 in the length direction of the first wall portion 211 is greater than the minimum distance between the projection of the first groove 2121 on the support surface 31 along the thickness direction of the first wall portion 211 and the edge of the first opening 321 in the width direction of the first wall portion 211, thereby reducing the suppression of the deformation of the pressure relief component 212 in the length direction of the first wall portion 211, so that the pressure relief component 212 deforms more greatly when the battery cell 20 releases pressure, allowing the first groove 2121 to crack more promptly when the battery cell 20 releases pressure, which is beneficial to improving the timeliness of the pressure relief of the battery cell 20 and improving the reliability of the battery 100.

[0183] In some embodiments, A1 ≥ 5 mm.

[0184] The minimum distance between the projection of the first groove 2121 on the support surface 31 along the thickness direction of the first wall portion 211 and the edge of the first opening 321 in the length direction of the first wall portion 211 can be: A1 = 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, etc.

[0185] When the minimum distance between the projection of the first groove 2121 on the support surface 31 along the thickness direction of the first wall portion 211 and the edge of the first opening 321 in the length direction of the first wall portion 211 is greater than or equal to 5 mm, in the length direction of the first wall portion 211, the first groove 2121 is farther away from the edge of the first opening 321, and the avoidance effect of the avoidance portion 32 on the first groove 2121 is better. When the battery cell 20 is depressurized, the support member 30 is less likely to abut against the outside of the first groove 2121, and it is less likely to suppress the deformation of the pressure relief component 212 and the cracking of the first groove 2121, so that the first groove 2121 can be cracked in time when the battery cell 20 is depressurized, which is beneficial to improving the timeliness of the pressure relief of the battery cell 20 and improving the reliability of the battery 100. In addition, by ensuring that the minimum distance between the projection of the first groove 2121 on the support surface 31 along the thickness direction of the first wall portion 211 and the edge of the first opening 321 in the length direction of the first wall portion 211 is greater than or equal to 5 mm, the avoidance portion 32 is larger in the length direction of the first wall portion 211, which can absorb assembly errors and has lower assembly requirements.

[0186] In some embodiments, the difference between A1 and A2 is less than 10 mm.

[0187] “The difference between A1 and A2 is less than 10mm” means: A1-A2<10mm.

[0188] By making the difference between A1 and A2 less than 10 mm, A1 and A2 are made closer, and the deformation suppression of the pressure relief component 212 in the length direction of the first wall portion 211 and the deformation suppression of the pressure relief component 212 in the width direction of the first wall portion 211 are both small, so that the pressure relief component 212 is more likely to deform in both the length direction and the width direction of the first wall portion 211, so that the first groove 2121 can be cracked more promptly when the battery cell 20 is depressurized, which is beneficial to improving the timeliness of the pressure relief of the battery cell 20 and improving the reliability of the battery 100.

[0189] 3, 4, 5, 6, and 7, in some embodiments, the first groove 2121 defines a predetermined pressure relief area 21211. The pressure relief component 212 includes a second groove 2124, which is configured to guide at least a portion of the predetermined pressure relief area 21211 to flip over, thereby opening at least a portion of the predetermined pressure relief area 21211. Along the thickness direction of the first wall portion 211, the projection of the second groove 2124 is located within the avoidance portion 32.

[0190] The first groove 2121 defines a predetermined pressure relief area 21211 . When the battery cell 20 releases pressure, the first groove 2121 cracks along the edge of the predetermined pressure relief area 21211 , so that the predetermined pressure relief area 21211 can be opened to release pressure.

[0191] The second groove 2124 serves to guide at least a portion of the predetermined pressure relief area 21211 to flip open. Optionally, the depth of the first groove 2121 is greater than the depth of the second groove 2124. When the battery cell 20 releases pressure, the pressure relief component 212 first splits along the first groove 2121, allowing the fluid medium within the battery cell 20 to flow out and release pressure. Subsequently, under the influence of the fluid medium, the predetermined pressure relief area 21211 rotates outward about the second groove 2124, opening a larger first opening 321 and achieving rapid pressure relief.

[0192] The second groove 2124 can be arranged on the same side of the pressure relief component 212 as the first groove 2121, or can be respectively arranged on both sides of the pressure relief component 212. For example, in Figures 4 and 5, the first groove 2121 and the second groove 2124 are respectively arranged on both sides of the pressure relief component 212, the first groove 2121 is arranged on the side of the pressure relief component 212 away from the interior of the shell 21, and the second groove 2124 is arranged on the side of the pressure relief component 212 facing the interior of the shell 21.

[0193] Exemplarily, the first groove 2121 and the second groove 2124 are both formed by a stamping process.

[0194] The provision of the second groove 2124 weakens the strength of the pressure relief component 212 at the location of the second groove 2124, making it easier for the predetermined pressure relief area 21211 to flip open under the action of the fluid medium. This not only increases the probability of the predetermined pressure relief area 21211 opening, but also increases the speed of the predetermined pressure relief area 21211 opening, achieving rapid pressure relief, reducing the risk of explosion or fire of the battery cell 20, and thereby improving the reliability of the battery cell 20. By providing the relief portion 32 on the support member 30 and positioning the projection of the second groove 2124 along the thickness direction of the first wall portion 211 within the relief portion 32, the relief portion 32 avoids the second groove 2124. This prevents the support member 30 from abutting against the outside of the predetermined pressure relief area 21211 during pressure relief from the battery cell 20, thereby preventing the predetermined pressure relief area 21211 from flipping open. This allows the predetermined pressure relief area 21211 to flip open promptly during pressure relief from the battery cell 20, thereby improving the timeliness of pressure relief from the battery cell 20 and the reliability of the battery 100.

[0195] 3, 4, 5, 6, and 7, in some embodiments, the avoidance portion 32 forms a first opening 321 on the support surface 31. The minimum distance B between the projection of the second groove 2124 along the thickness direction of the first wall portion 211 on the support surface 31 and the edge of the first opening 321 is satisfied: B ≥ 3 mm.

[0196] B represents the minimum distance between the projection of the second groove 2124 on the support surface 31 along the thickness direction of the first wall portion 211 and the edge of the first opening 321 (ie, the aforementioned edge line).

[0197] The minimum distance between the projection of the second groove 2124 on the support surface 31 along the thickness direction of the first wall portion 211 and the edge of the first opening 321 can be: B = 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, etc.

[0198] When the minimum distance between the projection of the second groove 2124 on the support surface 31 along the thickness direction of the first wall portion 211 and the edge of the first opening 321 is greater than or equal to 3 mm, the second groove 2124 is farther from the edge of the first opening 321 in a direction perpendicular to the thickness direction of the first wall portion 211, and the relief portion 32 effectively avoids the second groove 2124. This makes it less likely that the support member 30 will abut against the predetermined pressure relief area 21211 during pressure relief of the battery cell 20, and less likely to inhibit the predetermined pressure relief area 21211 from flipping over. This allows the predetermined pressure relief area 21211 to flip open promptly during pressure relief of the battery cell 20, thereby improving the timeliness of pressure relief for the battery cell 20 and the reliability of the battery 100. Furthermore, by ensuring that the minimum distance between the projection of the second groove 2124 on the support surface 31 along the thickness direction of the first wall portion 211 and the edge of the first opening 321 is greater than or equal to 3 mm, the first opening 321 of the relief portion 32 is larger, thereby absorbing assembly errors and reducing assembly requirements.

[0199] Referring to Figures 3, 4, 5, 6, and 7, in some embodiments, the first wall portion 211 is a rectangular structure. The minimum distance between the projection of the second groove 2124 along the thickness direction of the first wall portion 211 on the support surface 31 and the edge of the first opening 321 in the length direction of the first wall portion 211 is B1, and the minimum distance between the projection of the second groove 2124 along the thickness direction of the first wall portion 211 on the support surface 31 and the edge of the first opening 321 in the width direction of the first wall portion 211 is B2, satisfying the following: B = B2, B2 < B1.

[0200] The minimum distance between the projection of the second groove 2124 on the support surface 31 along the thickness direction of the first wall portion 211 and the first short side is the fifth distance, and the minimum distance between the projection of the second groove 2124 on the support surface 31 along the thickness direction of the first wall portion 211 and the second short side is the sixth distance, and B1 represents the minimum distance between the fifth distance and the sixth distance.

[0201] The minimum distance between the projection of the second groove 2124 on the support surface 31 along the thickness direction of the first wall portion 211 and the first long side is the seventh distance, and the minimum distance between the projection of the second groove 2124 on the support surface 31 along the thickness direction of the first wall portion 211 and the second long side is the eighth distance, and B2 represents the minimum distance between the seventh distance and the eighth distance.

[0202] B=B2, that is, the minimum distance between the projection of the second groove 2124 on the support surface 31 along the thickness direction of the first wall portion 211 and the edge of the first opening 321 in the width direction of the first wall portion 211 is the minimum distance between the projection of the second groove 2124 on the support surface 31 along the thickness direction of the first wall portion 211 and the edge of the first opening 321.

[0203] B2<B1, that is, the minimum distance between the projection of the second groove 2124 on the support surface 31 along the thickness direction of the first wall portion 211 and the edge of the first opening 321 in the length direction of the first wall portion 211 is greater than the minimum distance between the projection of the second groove 2124 on the support surface 31 along the thickness direction of the first wall portion 211 and the edge of the first opening 321 in the width direction of the first wall portion 211.

[0204] The minimum distance between the projection of the second groove 2124 on the support surface 31 along the thickness direction of the first wall portion 211 and the edge of the first opening 321 in the length direction of the first wall portion 211 is greater than the minimum distance between the projection of the second groove 2124 on the support surface 31 along the thickness direction of the first wall portion 211 and the edge of the first opening 321 in the width direction of the first wall portion 211. In this way, the support member 30 can suppress the deformation of the pressure relief component 212 in the length direction of the first wall portion 211 to a lesser extent. The first wall portion 211 is a rectangular structure. The stiffness of the pressure relief component 212 in the width direction of the first wall portion 211 changes slightly, and the stiffness of the pressure relief component 212 in the length direction of the first wall portion 211 changes significantly. The deformation of the pressure relief component 212 at the middle position in the length direction of the first wall portion 211 changes significantly compared to the deformation of the pressure relief component 212 at the edge position in the length direction of the first wall portion 211. The deformation of the pressure relief component 212 at the middle position in the width direction of the first wall portion 211 changes slightly compared to the deformation of the pressure relief component 212 at the edge position in the width direction of the first wall portion 211. By making the second groove 2124 along the thickness of the first wall portion 211 The minimum distance between the projection of the second groove 2124 on the support surface 31 along the thickness direction of the first wall portion 211 and the edge of the first opening 321 in the length direction of the first wall portion 211 is greater than the minimum distance between the projection of the second groove 2124 on the support surface 31 along the thickness direction of the first wall portion 211 and the edge of the first opening 321 in the width direction of the first wall portion 211, thereby reducing the suppression of the deformation of the pressure relief component 212 in the length direction of the first wall portion 211, so that the pressure relief component 212 deforms more when the battery cell 20 releases pressure, allowing the predetermined pressure relief area 21211 to be flipped open in time when the battery cell 20 releases pressure, which is beneficial to improving the timeliness of the pressure relief of the battery cell 20 and improving the reliability of the battery 100.

[0205] 3, 4, 5, 6, and 7, in some embodiments, the first groove 2121 and the second groove 2124 are arranged along the width direction of the first wall portion 211. The minimum distance between the projection of the first groove 2121 along the thickness direction of the first wall portion 211 on the support surface 31 and the edge of the first opening 321 in the width direction of the first wall portion 211 is A1, where A1>B1.

[0206] The first groove 2121 and the second groove 2124 are arranged along the width direction of the first wall portion 211 . The first groove 2121 and the second groove 2124 may be spaced apart, or the first groove 2121 and the second groove 2124 may be connected.

[0207] A1>B1, that is, the minimum distance between the projection of the first groove 2121 on the support surface 31 along the thickness direction of the first wall portion 211 and the edge of the first opening 321 in the width direction of the first wall portion 211 is greater than the minimum distance between the projection of the second groove 2124 on the support surface 31 along the thickness direction of the first wall portion 211 and the edge of the first opening 321 in the width direction of the first wall portion 211.

[0208] In the width direction of the first wall portion 211 , the second groove 2124 is closer to the edge of the first opening 321 than the first groove 2121 . In this way, the support member 30 is less likely to suppress the cracking of the first groove 2121 , so that the first groove 2121 can crack in time when the battery cell 20 is depressurized.

[0209] 3 , 4 , 5 , 6 and 7 , in some embodiments, along the width direction of the first wall portion 211 , the projection of the second groove 2124 on the support surface 31 is located between the projection of the first groove 2121 on the support surface 31 and the edge of the first opening 321 .

[0210] “Along the width direction of the first wall portion 211, the projection of the second groove 2124 on the support surface 31 is located between the projection of the first groove 2121 on the support surface 31 and the edge of the first opening 321” can also be understood as: the projection of the second groove 2124 on the support surface 31 along the thickness direction of the first wall portion 211 is located between the first long side and the projection of the first groove 2121 on the support surface 31 along the thickness direction of the first wall portion 211, or the projection of the second groove 2124 on the support surface 31 along the thickness direction of the first wall portion 211 is located between the second long side and the projection of the first groove 2121 on the support surface 31 along the thickness direction of the first wall portion 211.

[0211] By making the projection of the second groove 2124 on the support surface 31 between the projection of the first groove 2121 on the support surface 31 and the edge of the first opening 321, in the width direction of the first wall portion 211, the first groove 2121 is farther away from the edge of the first opening 321 than the second groove 2124. In this way, the support member 30 is less likely to suppress the cracking of the first groove 2121, so that the first groove 2121 can crack in time when the battery cell 20 is depressurized.

[0212] 3 , 4 , 5 , 6 and 7 , in some embodiments, second grooves 2124 are disposed on both sides of the first groove 2121 along the width direction of the first wall portion 211 .

[0213] Second grooves 2124 are provided on both sides of the first groove 2121 along the width direction of the first wall portion 211 . Along the width direction of the first wall portion 211 , the number of second grooves 2124 on one side of the first groove 2121 can be one or more.

[0214] By arranging second grooves 2124 on both sides of the first groove 2121 along the width direction of the first wall portion 211, predetermined pressure relief areas 21211 are respectively defined on both sides of the first groove 2121 along the width direction of the first wall portion 211. When the battery cell 20 releases pressure, the two predetermined pressure relief areas 21211 are flipped open under the guidance of their corresponding second grooves 2124, so that the battery cell 20 has a larger pressure relief area, which is beneficial to improving the pressure relief rate of the battery cell 20 and improving the reliability of the battery cell 20.

[0215] Please refer to Figures 3, 4, 5, 6 and 7. In some embodiments, the pressure relief component 212 has a first surface 2122 and a second surface 2123 arranged opposite to each other in the thickness direction of the first wall portion 211, the first groove 2121 is arranged on the first surface 2122, and the second groove 2124 is arranged on the second surface 2123.

[0216] The first groove 2121 is provided on the first surface 2122 , and the second groove 2124 is provided on the second surface 2123 . The first groove 2121 and the second groove 2124 are respectively located on two opposite surfaces of the pressure relief component 212 along the thickness direction of the first wall portion 211 .

[0217] The first groove 2121 and the second groove 2124 can be formed by various methods, such as stamping, cold heading, etc. For example, the first groove 2121 can be formed by stamping on the pressure relief component 212 along the direction from the first surface 2122 to the second surface 2123.

[0218] Stamping or cold heading the first and second grooves 2121, 2124 causes the groove walls of the first and second grooves 2121, 2124 to undergo cold work hardening (changing the grain arrangement, causing lattice distortion, reducing the metal's plasticity, and increasing the material's hardness). This enhances their ability to resist external impacts and makes them less susceptible to damage from external impacts. This helps reduce the risk of fluid leakage from the pressure relief component 212.

[0219] By respectively arranging the first groove 2121 and the second groove 2124 on the first surface 2122 and the second surface 2123 of the pressure relief component 212, so that the first groove 2121 and the second groove 2124 are respectively located on both sides of the pressure relief component 212, it is convenient to process the first groove 2121 and the second groove 2124 on both sides of the pressure relief component 212, which is beneficial to reduce the mutual influence of the first groove 2121 and the second groove 2124 during the processing.

[0220] 3 , 4 , 5 , 6 and 7 , in some embodiments, the first surface 2122 is the surface of the pressure relief component 212 facing away from the interior of the housing 21 , and the second surface 2123 is the surface of the pressure relief component 212 facing the interior of the housing 21 .

[0221] The first surface 2122 is the surface of the pressure relief component 212 facing away from the interior of the housing 21 , that is, the outer surface of the pressure relief component 212 . The second surface 2123 is the surface of the pressure relief component 212 facing the interior of the housing 21 , that is, the inner surface of the pressure relief component 212 .

[0222] The first groove 2121 is provided on the outer surface of the pressure relief component 212 , and the second groove 2124 is provided on the inner surface of the pressure relief component 212 .

[0223] By arranging the first groove 2121 on the surface of the pressure relief component 212 facing away from the interior of the housing 21, the tension that the first groove 2121 needs to overcome when cracking is reduced, making it easier to crack. By arranging the second groove 2124 on the surface of the pressure relief component 212 facing the interior of the housing 21, the tension that the predetermined pressure relief area 21211 needs to overcome when flipping is reduced, thereby facilitating the rapid flipping and opening of the predetermined pressure relief area 21211, thereby improving the reliability of the battery cell 20.

[0224] Referring to Figures 3, 4, 5, 6, and 7, in some embodiments, the first groove 2121 includes a first groove section 2121a, a second groove section 2121b, and a third groove section 2121c. The first groove section 2121a and the third groove section 2121c are arranged opposite each other, and the second groove section 2121b connects the first groove section 2121a and the third groove section 2121c. The first groove section 2121a, the second groove section 2121b, and the third groove section 2121c define a predetermined pressure relief area 21211.

[0225] The first slot section 2121a and the third slot section 2121c are spaced apart and at least partially opposite to each other. Optionally, the first slot section 2121a and the third slot section 2121c both extend along the width direction of the first wall portion 211.

[0226] The second slot segment 2121b connects the first slot segment 2121a and the third slot segment 2121c, that is, the second slot segment 2121b is located between the first slot segment 2121a and the third slot segment 2121c, and the two ends of the second slot segment 2121b are respectively connected to the first slot segment 2121a and the third slot segment 2121c. Of course, in other embodiments, the two ends of the second slot segment 2121b can extend out of the first slot segment 2121a and the third slot segment 2121c, respectively.

[0227] Referring to Figure 7 , a line connecting the free end of the first slot segment 2121a and the free end of the second slot segment 2121b is a first line. The first line is disposed opposite the second slot segment 2121b along the width direction of the first wall portion 211. The enclosed area collectively enclosed by the first slot segment 2121a, the second slot segment 2121b, the third slot segment 2121c, and the first line is a predetermined pressure relief area 21211. That is to say, the first slot section 2121a, the second slot section 2121b and the third slot section 2121c are structures arranged along the edge of the predetermined pressure relief area 21211, so that the predetermined pressure relief area 21211 can be opened with the first slot section 2121a, the second slot section 2121b and the third slot section 2121c as boundaries, that is, the predetermined pressure relief area 21211 is formed in the area enclosed by the first slot section 2121a, the second slot section 2121b and the third slot section 2121c, so that the part of the pressure relief component 212 located in the predetermined pressure relief area 21211 can be opened with the first slot section 2121a, the second slot section 2121b and the third slot section 2121c as boundaries when the battery cell 20 is depressurized, thereby releasing the internal pressure of the battery cell 20.

[0228] The first groove 2121 includes a first groove section 2121a, a second groove section 2121b and a third groove section 2121c. The second groove section 2121b connects the first groove section 2121a and the third groove section 2121c, so that the pressure relief component 212 can split along the first groove section 2121a, the second groove section 2121b and the third groove section 2121c when the battery cell 20 releases pressure, so as to open the predetermined pressure relief area 21211 to release the internal pressure of the battery cell 20. The first groove 2121 with this structure makes the connection position between the first groove section 2121a and the second groove section 2121b and the connection position between the first groove section 2121a and the third groove section 2121c weaker, easier to split and open the predetermined pressure relief area 21211 for pressure relief, and can further improve the pressure relief area and pressure relief rate of the battery cell 20.

[0229] Optionally, the first groove 2121 further includes a fourth groove section 2121d, which is located between the first groove section 2121a and the third groove section 2121c and intersects with the second groove section 2121b. This makes the connection between the fourth groove section 2121d and the second groove section 2121b weaker, making it easier to break and open the predetermined pressure relief area 21211 for pressure relief, thereby further increasing the pressure relief area and pressure relief rate of the battery cell 20.

[0230] 3, 4, 5, 6, and 7, in some embodiments, the first groove 2121 defines two predetermined pressure relief areas 21211, which are located on either side of the second groove section 2121b. Each predetermined pressure relief area 21211 is provided with at least one second groove 2124.

[0231] 7 , the first groove 2121 formed by the first groove section 2121a, the second groove section 2121b and the third groove section 2121c may be in an “H”-shaped structure to form two predetermined pressure relief areas 21211 on the pressure relief component 212, and the two predetermined pressure relief areas 21211 are respectively located on both sides of the second groove section 2121b.

[0232] Each predetermined pressure relief area 21211 may be provided with one second groove 2124 , two second grooves 2124 , three second grooves 2124 or more than three second grooves 2124 . As shown in FIG. 7 , each predetermined pressure relief area 21211 is provided with one second groove 2124 .

[0233] The first groove 2121 defines two predetermined pressure relief areas 21211, and each predetermined pressure relief area 21211 is correspondingly provided with at least one second groove 2124. When the battery cell 20 releases pressure, the two predetermined pressure relief areas 21211 are flipped open under the guidance of their corresponding second grooves 2124, so that the battery cell 20 has a larger pressure relief area, which is beneficial to improving the pressure relief rate of the battery cell 20 and improving the reliability of the battery cell 20.

[0234] 3 , 4 , 5 , 6 and 7 , in some embodiments, each predetermined pressure relief area 21211 is correspondingly provided with a second groove 2124 , and the first groove 2121 is located between two second grooves 2124 .

[0235] The predetermined pressure relief areas 21211 correspond one to one with the second grooves 2124. Along the width direction of the first wall portion 211, the two second grooves 2124 are located on both sides of the first groove 2121.

[0236] As shown in Figure 7, along the width direction of the first wall portion 211, the first groove 2121 is located between the two second grooves 2124, that is: along the width direction of the first wall portion 211, the first groove section 2121a, the second groove section 2121b and the third groove section 2121c are all located between the two second grooves 2124.

[0237] The predetermined pressure relief areas 21211 correspond one-to-one with the second grooves 2124, which can reduce the number of second grooves 2124 required, reduce the number of times the pressure relief component 212 needs to be processed, and reduce the stress on the pressure relief component 212. By positioning the first groove 2121 between the two second grooves 2124, when the battery cell 20 releases pressure, the pressure relief component 212 can split along the first groove section 2121a, the second groove section 2121b, and the third groove section 2121c, thereby opening the two predetermined pressure relief areas 21211. The two predetermined pressure relief areas 21211 are then flipped open under the guidance of their corresponding second grooves 2124, providing the battery cell 20 with a larger pressure relief area. This helps to increase the pressure relief rate and reliability of the battery cell 20.

[0238] 3 , 4 , 5 , 6 and 7 , in some embodiments, the position where the second slot segment 2121b is connected to the first slot segment 2121a deviates from the two ends of the first slot segment 2121a, and the position where the second slot segment 2121b is connected to the third slot segment 2121c deviates from the two ends of the third slot segment 2121c.

[0239] Among them, the connection position of the second slot segment 2121b and the first slot segment 2121a deviates from the two ends of the first slot segment 2121a, that is, the second slot segment 2121b is connected between the two ends of the first slot segment 2121a. Similarly, the connection position of the third slot segment 2121c and the second slot segment 2121b deviates from the two ends of the third slot segment 2121c, that is, the second slot segment 2121b is connected between the two ends of the third slot segment 2121c, so that the shape of the first groove 2121 formed by the first slot segment 2121a, the second slot segment 2121b and the third slot segment 2121c is an approximately "H"-shaped structure.

[0240] By setting the connection position of the second groove section 2121b and the first groove section 2121a to be located between the two ends of the second groove section 2121b, and setting the connection position of the second groove section 2121b and the third groove section 2121c to be located between the two ends of the third groove section 2121c, so that the first groove section 2121a, the second groove section 2121b and the third groove section 2121c form a structure similar to an "H" shape, so that predetermined pressure relief areas 21211 can be formed on both sides of the second groove section 2121b of the first groove 2121, and the two predetermined pressure relief areas 21211 can be opened in a split manner for pressure relief when the battery cell 20 is relieved of pressure, which is beneficial to further increase the pressure relief effect of the battery cell 20 and can effectively improve the pressure relief rate of the battery cell 20.

[0241] 3 , 4 , 5 , 6 and 7 , in some embodiments, the first slot segment 2121 a , the second slot segment 2121 b and the third slot segment 2121 c are spaced apart from the second groove 2124 .

[0242] Along the thickness direction of the first wall portion 211, the projection of the first groove 2121 does not overlap with the projection of the second groove 2124, that is, the projection of the first groove segment 2121a along the thickness direction of the first wall portion 211, the projection of the second groove 2124 along the thickness direction of the first wall portion 211, and the projection of the third groove segment 2121c along the thickness direction of the first wall portion 211 do not overlap with the second groove 2124.

[0243] By arranging the first groove section 2121a, the second groove section 2121b and the third groove section 2121c to be spaced apart from the second groove 2124, on the one hand, the mutual influence between the first groove 2121 and the second groove 2124 during the processing can be reduced; on the other hand, the phenomenon that the pressure relief component 212 cracks along the second groove 2124 when the pressure relief component 212 cracks along the first groove 2121 to relieve pressure can be reduced, and the stress influence between the area where the pressure relief component 212 is provided with the first groove 2121 and the area where the pressure relief component 212 is provided with the second groove 2124 can be reduced.

[0244] 3, 4, 5, 6 and 7, in some embodiments, the second slot section 2121b is disposed opposite to the second groove 2124 along the first direction. The first slot section 2121a and the third slot section 2121c are both spaced apart from the second groove 2124 along the first direction.

[0245] Along the first direction, the second slot segment 2121b is disposed opposite the second groove 2124, and the first slot segment 2121a and the third slot segment 2121c are both spaced apart from the second groove 2124. A distance exists between the first slot segment 2121a and the second groove 2124 in the direction in which the second slot segment 2121b and the second groove 2124 are disposed opposite each other. A distance exists between the third slot segment 2121c and the second groove 2124 in the direction in which the second slot segment 2121b and the second groove 2124 are disposed opposite each other.

[0246] By arranging the second slot section 2121b and the second groove 2124 relative to each other along the first direction, the first slot section 2121a and the third slot section 2121c are spaced apart from the second groove 2124 in the first direction, so that the predetermined pressure relief area 21211 defined by the first slot section 2121a, the second slot section 2121b and the third slot section 2121c can be flipped around the area of ​​the pressure relief component 212 where the second groove 2124 is provided when it is opened, and the flipping angle of the predetermined pressure relief area 21211 after being opened can be increased, thereby improving the pressure relief area of ​​the battery cell 20.

[0247] 3 , 4 , 5 , 6 and 7 , in some embodiments, the first wall portion 211 is a rectangular structure, and the first direction is parallel to the width direction of the first wall portion 211 .

[0248] The second groove section 2121b and the second groove 2124 are arranged along the width of the first wall portion 211. The first groove section 2121a and the third groove section 2121c are spaced apart from the second groove 2124 along the width of the first wall portion 211. The first groove section 2121a has a larger width, making it easier to machine the first groove 2121 and the second groove 2124. Furthermore, during production, the detonation pressure of the multiple battery cells 20 machined is relatively consistent.

[0249] 3, 4, 5, 6, and 7, in some embodiments, the pressure relief component 212 has a first surface 2122 and a second surface 2123 disposed opposite each other in the thickness direction of the first wall portion 211. The first groove 2121 includes multiple levels of grooves sequentially arranged from the first surface 2122 to the second surface 2123. In two adjacent levels of grooves, the first level groove farther from the first surface 2122 is disposed at the bottom surface of the first level groove closer to the first surface 2122.

[0250] The pressure relief component 212 is provided with a plurality of grooves. The grooves are arranged in sequence along the direction from the first surface 2122 to the second surface 2123. The bottom surface profile of each groove gradually decreases. The cross-sectional shape of the grooves can be various, such as rectangular or circular. The grooves on the pressure relief component 212 can be formed by various methods, such as stamping, cold heading, etc.

[0251] For example, as shown in Figures 4 and 5, the pressure relief component 212 is provided with three levels of grooves, namely, a first-level groove, a second-level groove, and a third-level groove. During processing and forming, the first-level groove can be first stamped on the first surface 2122, then the second-level groove can be stamped on the bottom surface of the first-level groove, and finally the third-level groove can be stamped on the bottom surface of the second-level groove.

[0252] The multi-level grooves are sequentially arranged on the pressure relief component 212 along the direction from the first surface 2122 to the second surface 2123 . During molding, the multi-level grooves can be sequentially molded on the pressure relief component 212 along the direction from the first surface 2122 to the second surface 2123 .

[0253] The multi-level grooves are sequentially arranged on the pressure relief component 212 in the direction from the first surface 2122 to the second surface 2123. During molding, the multi-level grooves can be formed step by step, thereby reducing the molding force on the pressure relief component 212 and reducing the risk of cracks in the pressure relief component 212. The pressure relief component 212 is not likely to fail due to cracks in the locations where the grooves are set, thereby improving the reliability of the battery cell 20. When forming the multi-level grooves, stamping or cold heading can be used. In this way, the groove walls will undergo cold work hardening (the grain arrangement changes, resulting in lattice distortion, reducing the plasticity of the metal and increasing the hardness of the material), and its ability to resist external impact is enhanced, making it less susceptible to damage due to external impact. This helps to reduce the risk of leakage from the pressure relief component 212.

[0254] 3 , 4 , 5 , 6 , 7 , 8 and 9 , in some embodiments, the battery cell 20 includes an electrode terminal 23 , which is disposed on other walls of the housing 21 except the first wall 211 .

[0255] The electrode terminal 23 and the pressure relief member 212 are disposed on different walls of the housing 21. For example, when the first wall portion 211 is the bottom wall of the housing 214, the electrode terminal 23 can be disposed on a side wall of the housing 214 or on the end cap 213. For another example, when the first wall portion 211 is one side wall of the housing 214, the electrode terminal 23 can be disposed on another side wall, the bottom wall, or the end cap 213 of the housing 214. When the first wall portion 211 is the end cap 213, the electrode terminal 23 can be disposed on a side wall or the bottom wall of the housing 214.

[0256] The electrode terminal 23 and the pressure relief component 212 are respectively arranged on different walls of the shell 21. When the battery cell 20 is depressurized, the ejected fluid medium is not likely to act on the electrode terminal 23 and cause the electrode terminal 23 to short-circuit, thereby reducing the risk of short circuit when the battery cell 20 is depressurized.

[0257] Optionally, the electrode terminal 23 is provided on a wall of the housing 21 opposite to the first wall portion 211 .

[0258] When the first wall portion 211 is the bottom wall of the housing 214, the electrode terminal 23 can be disposed on the end cap 213. When the first wall portion 211 is a side wall of the housing 214, the electrode terminal 23 can be disposed on the other side wall of the housing 214 opposite the first wall portion 211. When the first wall portion 211 is the end cap 213, the electrode terminal 23 can be disposed on the bottom wall of the housing 214.

[0259] The electrode terminal 23 is arranged on the wall of the shell 21 opposite to the first wall. The electrode terminal 23 is far away from the pressure relief component 212. When the battery cell 20 is depressurized, the ejected fluid medium is less likely to act on the electrode terminal 23 and cause the electrode terminal 23 to short-circuit, further reducing the risk of short circuit when the battery cell 20 is depressurized.

[0260] In some embodiments, the battery cell 20 may also include two current collecting components 24, both of which are arranged in the outer shell 21. Each current collecting component 24 is used to connect an electrode terminal 23 and a plurality of electrode assemblies 22 with the same polarity of the electrode lugs to achieve electrical connection between the electrode terminal 23 and the electrode assembly 22, which is conducive to reducing the difficulty of assembly between the electrode lugs and the electrode terminal 23.

[0261] 3 , 4 , 5 , 6 , 7 , 8 , and 9 , in some embodiments, the housing 21 includes a shell 214 and an end cap 213 . The shell 214 has a second opening 2141 . The end cap 213 is connected to the shell 214 and closes the second opening 2141 . The end cap 213 is the first wall portion 211 , or the shell 214 includes the first wall portion 211 .

[0262] The shell 214 includes an integrally formed side wall and bottom wall, that is, the shell 214 is manufactured using an integral molding process, such as an integral molding process such as stamping, casting or extrusion molding. In other words, the side wall and bottom wall of the shell 214 are an integral structure.

[0263] The housing 214 includes a first wall portion 211. That is, the first wall portion 211 is a wall of the housing 214. For example, in FIG9 , the first wall portion 211 is a bottom wall of the housing 214 disposed opposite the end cap 213 in the thickness direction of the first wall portion 211. Of course, in other embodiments, the first wall portion 211 may also be a side wall of the housing 214.

[0264] It should be noted that the structure of the battery cell 20 is not limited to this. In some embodiments, the battery cell 20 may also have other structures. For example, the outer shell 21 may include a shell 214 and an end cover 213. The interior of the shell 214 forms a accommodating cavity with a second opening 2141, and the accommodating cavity is used to accommodate the electrode assembly 22. The end cover 213 closes the second opening 2141, and the end cover 213 is the first wall portion 211.

[0265] It should be noted that the structure of the battery cell 20 can be various. In some embodiments, the outer shell 21 may include a shell 214 and two end covers 213. A accommodating cavity is formed inside the shell 214, and the accommodating cavity is used to accommodate the electrode assembly 22. The shell 214 has second openings 2141 formed at both ends in the thickness direction of the first wall portion 211, and the two second openings 2141 are connected to the accommodating cavity. The two end covers 213 respectively close the two second openings 2141, and one of the two end covers 213 is the first wall portion 211.

[0266] The shell 214 of the outer shell 21 is provided with second openings 2141 at both ends in the thickness direction of the first wall portion 211, and the two end covers 213 respectively close the two second openings 2141. The first wall portion 211 is one of the two end covers 213. The battery cell 20 adopting this structure is convenient for assembling the battery cell 20 from both ends of the shell 214, which is beneficial to reducing the manufacturing difficulty and assembly difficulty of the battery cell 20.

[0267] When the end cap 213 is the first wall portion 211, the pressure relief component 212 is disposed on the end cap 213, which simplifies and facilitates manufacturing. When the housing 214 includes the first wall portion 211, the pressure relief component 212 is disposed on a wall of the housing 214. The fluid medium ejected by the pressure relief component 212 is less likely to act on other electrical connection structures on the end cap 213, thereby reducing the risk of short circuits in the battery cells 20.

[0268] In some embodiments, the avoidance portion 32 is a through hole or a groove provided in the support member 30 .

[0269] When the relief portion 32 is a through hole provided in the support member 30 , the through hole penetrates the support member 30 along the thickness direction of the first wall portion 211 . When the relief portion 32 is a groove provided in the support member 30 , the groove is recessed from the support surface 31 away from the battery cell 20 .

[0270] In the embodiment where the avoidance portion 32 is a groove provided in the support member 30 , the bottom wall of the groove can be set to be relatively thin. When the battery cell 20 releases pressure, the fluid medium can break through the bottom wall of the groove to facilitate pressure release.

[0271] By forming a through hole or a groove on the support member 30 as the avoidance portion 32 , it is simple, convenient and easy to manufacture.

[0272] 3 and 4 , in some embodiments, the avoidance portion 32 corresponds to the pressure relief component 212 in a one-to-one manner.

[0273] Each pressure relief component 212 of each battery cell 20 has a corresponding escape portion 32. The escape portion 32 and the pressure relief component 212 are in a one-to-one relationship.

[0274] By aligning the relief portions 32 with the pressure relief components 212 on a one-to-one basis, each pressure relief component 212 can be effectively relieved, allowing each battery cell 20 to release pressure smoothly, thereby improving the reliability of the battery 100. Furthermore, since the relief portions 32 correspond one-to-one with the pressure relief components 212, each relief portion 32 can be smaller, and the structure remaining between two adjacent relief portions 32 can be considered a reinforcing rib, thus providing greater strength to the support member 30.

[0275] Please refer to Figures 10 and 11. Figure 10 is a schematic diagram of the structure of a battery cell 20 and a support member 30 according to other embodiments of the present application. Figure 11 is a cross-sectional view of a battery cell 20 and a support member 30 according to other embodiments of the present application. In other embodiments, at least one avoidance portion 32 is provided corresponding to the pressure relief component 212 of multiple battery cells 20.

[0276] At least one avoidance portion 32 and the pressure relief component 212 are in a one-to-many relationship, that is, at least one avoidance portion 32 can be used to avoid more than two pressure relief components 212. Of course, each avoidance portion 32 and the pressure relief component 212 can also be in a one-to-many relationship.

[0277] One relief portion 32 can correspond to the pressure relief components 212 of multiple battery cells 20. The structure remaining between two adjacent relief portions 32 can be considered a reinforcing rib, providing greater strength to the support member 30. Furthermore, a single relief portion 32 can be larger, accommodating assembly tolerances and reducing assembly requirements.

[0278] 10 and 11 , in some embodiments, the battery 100 includes multiple rows of battery cells 20 , and one avoidance portion 32 is disposed corresponding to the pressure relief components 212 of at least two battery cells 20 in a row of battery cells 20 .

[0279] One avoidance portion 32 can be set corresponding to the pressure relief components 212 of two battery cells 20 in a row of battery cells 20, one avoidance portion 32 can also be set corresponding to the pressure relief components 212 of three battery cells 20 in a row of battery cells 20, one avoidance portion 32 can also be set corresponding to the pressure relief components 212 of four battery cells 20 in a row of battery cells 20, and one avoidance portion 32 can also be set corresponding to the pressure relief components 212 of more than four battery cells 20 in a row of battery cells 20.

[0280] The battery 100 includes multiple rows of battery cells 20. Correspondingly, the avoidance portions 32 can also be set in multiple rows. The number of avoidance portions 32 is less than the number of battery cells 20, so that one avoidance portion 32 can correspond to the pressure relief components 212 of at least two battery cells 20 in a row of battery cells 20.

[0281] Please refer to Figures 12 and 13. Figure 12 is a schematic diagram of the structure of a battery cell 20 and a support member 30 provided in further embodiments of the present application. Figure 13 is a cross-sectional view of a battery cell 20 and a support member 30 provided in further embodiments of the present application. In further embodiments, the battery 100 includes multiple rows of battery cells 20, and a relief portion 32 is provided corresponding to the pressure relief member 212 of a row of battery cells 20.

[0282] One avoidance portion 32 is provided corresponding to the pressure relief components 212 of a row of battery cells 20 . Along the thickness direction of the first wall portion 211 , the projections of the pressure relief components 212 of a row of battery cells 20 all fall within one avoidance portion 32 .

[0283] The battery 100 includes multiple rows of battery cells 20. Correspondingly, the avoidance portions 32 are also arranged in multiple rows. One avoidance portion 32 is arranged corresponding to the pressure relief component 212 of one row of battery cells 20. This is conducive to absorbing assembly tolerances and reducing assembly requirements.

[0284] Please refer to FIG14 , which is a cross-sectional view of a battery cell 20 and a support member 30 provided in some further embodiments of the present application. In some further embodiments, the support member 30 is connected to the first wall portion 211 via an adhesive layer 40 .

[0285] “The support member 30 and the first wall portion 211 are connected via the adhesive layer 40 ” means that the support member 30 and the first wall portion 211 are bonded and fixed.

[0286] The support member 30 is bonded and fixed to the wall portion, which enables the battery cell 20 to be stably connected to the support member 30 , reducing the risk of the battery cell 20 being separated from the support member 30 during use of the battery 100 , and has low assembly difficulty and low cost.

[0287] Referring to FIG. 14 , in some embodiments, the avoidance portion 32 is formed with a first opening 321 on the support surface 31 , and a gap is formed between the adhesive layer 40 and an edge of the first opening 321 .

[0288] Along the thickness direction of the first wall portion 211 , a projection of the adhesive layer 40 on the support surface 31 is located outside the edge of the first opening 321 .

[0289] By providing a gap between the adhesive layer 40 and the edge of the first opening 321, the adhesive layer 40 is arranged around the outside of the first opening 321, so that the adhesive layer 40 is not easily inhibited from deforming the pressure relief component 212 and cracking the first groove 2121, so that the first groove 2121 can be cracked in time when the battery cell 20 releases pressure, which is beneficial to improving the timeliness of the pressure relief of the battery cell 20 and improving the reliability of the battery 100.

[0290] Referring to Figure 14, in some embodiments, the battery 100 includes an electrical cavity 50 and an exhaust cavity 60. Along the thickness direction of the first wall portion 211, the electrical cavity 50 and the exhaust cavity 60 are located on both sides of the support member 30. The electrical cavity 50 is used to accommodate the battery cell 20, and the exhaust cavity 60 is used to guide gas circulation when the battery cell 20 is depressurized.

[0291] The support member 30 separates the housing 10 into an electrical chamber 50 and an exhaust chamber 60. The electrical chamber 50 and the exhaust chamber 60 are located on either side of the support member 30 along the thickness of the first wall portion 211. The battery cells 20 are housed within the electrical chamber 50, and the exhaust chamber 60 is used to guide airflow and fluid during pressure relief from the battery cells 20.

[0292] By setting an electrical cavity 50 to accommodate the battery cell 20 and setting an exhaust cavity 60 for discharging the fluid medium, the electrical cavity 50 and the exhaust cavity 60 are respectively set on both sides of the support member 30, so that the discharged fluid medium is not likely to act on the battery cell 20 in the electrical cavity 50, and is not likely to cause a short circuit in the battery cell 20, which is beneficial to improving the reliability of the battery 100.

[0293] In some embodiments, the support member 30 is configured to enable thermal management of the battery cells 20 .

[0294] The support member 30 may be a heat management component. For example, the support member 30 is a water-cooling plate that supports the first wall portion 211 of the battery cell 20 .

[0295] The support member 30 can also perform thermal management on the battery cell 20 to control the temperature of the battery cell 20 within an appropriate range, which is beneficial for the battery cell 20 to perform its performance. The support member 30 can perform multiple functions in one component, which is beneficial for simplifying the structure of the battery 100.

[0296] Referring to FIG. 14 , in some embodiments, the minimum thickness of the support member 30 excluding the avoidance portion 32 is greater than the maximum thickness of the first wall portion 211 .

[0297] 14 , the minimum thickness of the support member 30 excluding the avoidance portion 32 is C, and the maximum thickness of the first wall portion 211 is D, satisfying: C>D.

[0298] By making the minimum thickness of the support member 30 except the escape portion 32 greater than the maximum thickness of the first wall portion 211 , the support member 30 is thicker and has sufficient strength to stably support the battery cell 20 .

[0299] An embodiment of the present application further provides an electric device, which includes the battery 100 described above.

[0300] According to some embodiments of the present application, please refer to Figures 3 to 14.

[0301] An embodiment of the present application provides a battery cell 20, which includes the battery cell 20 and a support member 30. The battery cell 20 includes a housing 21 and a pressure relief component 212. The housing 21 includes a first wall portion 211, and the pressure relief component 212 is disposed on the first wall portion 211. The pressure relief component 212 includes a first groove 2121, and is configured to rupture along the first groove 2121 when the battery cell 20 releases pressure. The support member 30 supports the first wall portion 211. The support member 30 has a support surface 31 facing the first wall portion 211, and the support surface 31 is provided with a relief portion 32. Along the thickness direction of the first wall portion 211, the projection of the first groove 2121 is located within the relief portion 32. The pressure relief component 212 is disposed on the first wall portion 211 of the battery cell 20. When the battery cell 20 releases pressure, the pressure relief component 212 can rupture along the first groove 2121 to allow the fluid medium in the battery cell 20 to flow out and release pressure. The support member 30 can support the battery cell 20. By arranging an avoidance portion 32 on the support member 30 and making the projection of the first groove 2121 along the thickness direction of the first wall portion 211 located within the avoidance portion 32, the avoidance portion 32 can avoid the first groove 2121. When the battery cell 20 is depressurized, the support member 30 is not easy to abut against the outside of the first groove 2121, and it is not easy to suppress the deformation of the pressure relief component 212 and the cracking of the first groove 2121. Therefore, the first groove 2121 can be cracked in time when the battery cell 20 is depressurized, which is beneficial to improving the timeliness of the pressure relief of the battery cell 20 and improving the reliability of the battery 100.

[0302] The relief portion 32 forms a first opening 321 on the support surface 31. The minimum distance A between the projection of the first groove 2121 on the support surface 31 along the thickness direction of the first wall portion 211 and the edge of the first opening 321 satisfies the following condition: A ≥ 3 mm. When the minimum distance between the projection of the first groove 2121 on the support surface 31 along the thickness direction of the first wall portion 211 and the edge of the first opening 321 is greater than or equal to 3 mm, the first groove 2121 is farther from the edge of the first opening 321 in a direction perpendicular to the thickness direction of the first wall portion 211. This effectively avoids the relief portion 32 from the first groove 2121. This reduces the likelihood that the support member 30 will abut against the outside of the first groove 2121 during pressure relief from the battery cell 20, thereby preventing deformation of the pressure relief component 212 and cracking of the first groove 2121. This allows the first groove 2121 to promptly rupture during pressure relief from the battery cell 20, thereby improving the timely pressure relief of the battery cell 20 and the reliability of the battery 100. In addition, by ensuring that the minimum distance between the projection of the first groove 2121 on the support surface 31 along the thickness direction of the first wall portion 211 and the edge of the first opening 321 is greater than or equal to 3 mm, the first opening 321 of the avoidance portion 32 is larger, which can absorb assembly errors and has lower assembly requirements.

[0303] The first wall portion 211 has a rectangular structure. The minimum distance between the projection of the first groove 2121 along the thickness direction of the first wall portion 211 on the support surface 31 and the edge of the first opening 321 in the length direction of the first wall portion 211 is A1. The minimum distance between the projection of the first groove 2121 along the thickness direction of the first wall portion 211 on the support surface 31 and the edge of the first opening 321 in the width direction of the first wall portion 211 is A2, satisfying the following: A = A2, A2 < A1. The minimum distance between the projection of the first groove 2121 along the thickness direction of the first wall portion 211 on the support surface 31 and the edge of the first opening 321 in the width direction of the first wall portion 211 is the minimum distance between the projection of the first groove 2121 along the thickness direction of the first wall portion 211 on the support surface 31 and the edge of the first opening 321. In addition, the minimum distance between the projection of the first groove 2121 on the support surface 31 along the thickness direction of the first wall portion 211 and the edge of the first opening 321 in the length direction of the first wall portion 211 is greater than the minimum distance between the projection of the first groove 2121 on the support surface 31 along the thickness direction of the first wall portion 211 and the edge of the first opening 321 in the width direction of the first wall portion 211. In this way, the support member 30 can suppress the deformation of the pressure relief component 212 in the length direction of the first wall portion 211 to a lesser extent. The first wall portion 211 is a rectangular structure. The stiffness of the pressure relief component 212 in the width direction of the first wall portion 211 changes slightly, and the stiffness of the pressure relief component 212 in the length direction of the first wall portion 211 changes significantly. The deformation of the pressure relief component 212 at the middle position in the length direction of the first wall portion 211 changes significantly compared to the deformation of the pressure relief component 212 at the edge position in the length direction of the first wall portion 211. The deformation of the pressure relief component 212 at the middle position in the width direction of the first wall portion 211 changes slightly compared to the deformation of the pressure relief component 212 at the edge position in the width direction of the first wall portion 211. By making the first groove 2121 along the thickness of the first wall portion 211 The minimum distance between the projection of the first groove 2121 on the support surface 31 along the thickness direction of the first wall portion 211 and the edge of the first opening 321 in the length direction of the first wall portion 211 is greater than the minimum distance between the projection of the first groove 2121 on the support surface 31 along the thickness direction of the first wall portion 211 and the edge of the first opening 321 in the width direction of the first wall portion 211, thereby reducing the suppression of the deformation of the pressure relief component 212 in the length direction of the first wall portion 211, so that the pressure relief component 212 deforms more greatly when the battery cell 20 releases pressure, allowing the first groove 2121 to crack more promptly when the battery cell 20 releases pressure, which is beneficial to improving the timeliness of the pressure relief of the battery cell 20 and improving the reliability of the battery 100.

[0304] A1 ≥ 5 mm. When the minimum distance between the projection of the first groove 2121 on the support surface 31 along the thickness direction of the first wall portion 211 and the edge of the first opening 321 along the length direction of the first wall portion 211 is greater than or equal to 5 mm, the first groove 2121 is farther from the edge of the first opening 321 along the length direction of the first wall portion 211, and the avoidance portion 32 has a better avoidance effect on the first groove 2121. When the battery cell 20 is depressurized, the support member 30 is less likely to abut against the outside of the first groove 2121, which is less likely to suppress deformation of the pressure relief component 212 and cracking of the first groove 2121. This allows the first groove 2121 to crack promptly when the battery cell 20 is depressurized, thereby improving the timeliness of the pressure relief of the battery cell 20 and the reliability of the battery 100. In addition, by ensuring that the minimum distance between the projection of the first groove 2121 on the support surface 31 along the thickness direction of the first wall portion 211 and the edge of the first opening 321 in the length direction of the first wall portion 211 is greater than or equal to 5 mm, the avoidance portion 32 is larger in the length direction of the first wall portion 211, which can absorb assembly errors and has lower assembly requirements.

[0305] The first groove 2121 defines a predetermined pressure relief area 21211. The pressure relief component 212 includes a second groove 2124, which is configured to guide at least a portion of the predetermined pressure relief area 21211 to flip over, so as to open at least a portion of the predetermined pressure relief area 21211. In the thickness direction of the first wall portion 211, the projection of the second groove 2124 is located within the avoidance portion 32. By providing the second groove 2124, the strength of the pressure relief component 212 at the position of the second groove 2124 is weakened, making it easier for the predetermined pressure relief area 21211 to flip open under the action of the fluid medium, which not only increases the probability of the predetermined pressure relief area 21211 opening, but also increases the opening speed of the predetermined pressure relief area 21211, thereby achieving rapid pressure relief, reducing the risk of explosion and fire of the battery cell 20, and helping to improve the reliability of the battery cell 20. By arranging an avoidance portion 32 on the support member 30 and making the projection of the second groove 2124 along the thickness direction of the first wall portion 211 be located within the avoidance portion 32, the avoidance portion 32 can avoid the second groove 2124. When the battery cell 20 is depressurized, the support member 30 is not easy to abut against the outside of the predetermined pressure relief area 21211, and it is not easy to prevent the predetermined pressure relief area 21211 from flipping open, so that the predetermined pressure relief area 21211 can be flipped open in time when the battery cell 20 is depressurized, which is beneficial to improving the timeliness of the pressure relief of the battery cell 20 and improving the reliability of the battery 100.

[0306] The relief portion 32 forms a first opening 321 on the support surface 31. The minimum distance B between the projection of the second groove 2124 on the support surface 31 along the thickness direction of the first wall portion 211 and the edge of the first opening 321 satisfies the following condition: B ≥ 3 mm. When the minimum distance between the projection of the second groove 2124 on the support surface 31 along the thickness direction of the first wall portion 211 and the edge of the first opening 321 is greater than or equal to 3 mm, the second groove 2124 is farther from the edge of the first opening 321 in a direction perpendicular to the thickness direction of the first wall portion 211. This effectively avoids the second groove 2124, making it less likely that the support member 30 will abut against the predetermined pressure relief area 21211 during pressure relief of the battery cell 20, and thus less likely to inhibit the predetermined pressure relief area 21211 from flipping over. This allows the predetermined pressure relief area 21211 to flip open promptly when the battery cell 20 releases pressure, thereby improving the timeliness of pressure relief for the battery cell 20 and the reliability of the battery 100. In addition, by ensuring that the minimum distance between the projection of the second groove 2124 on the support surface 31 along the thickness direction of the first wall portion 211 and the edge of the first opening 321 is greater than or equal to 3 mm, the first opening 321 of the avoidance portion 32 is larger, which can absorb assembly errors and has lower assembly requirements.

[0307] In some embodiments, the relief portions 32 correspond one-to-one with the pressure relief components 212. This one-to-one correspondence between the relief portions 32 and the pressure relief components 212 provides a uniform relief effect for each pressure relief component 212, allowing for smooth pressure relief for each battery cell 20 and improving the reliability of the battery 100. Furthermore, since the relief portions 32 correspond one-to-one with the pressure relief components 212, each relief portion 32 can be smaller, and the structure remaining between two adjacent relief portions 32 can be considered a reinforcing rib, thus providing greater strength to the support member 30.

[0308] In other embodiments, at least one relief portion 32 is provided corresponding to the pressure relief components 212 of multiple battery cells 20. One relief portion 32 can correspond to the pressure relief components 212 of multiple battery cells 20. The structure remaining between two adjacent relief portions 32 can be considered a reinforcing rib, providing greater strength to the support member 30. Furthermore, a single relief portion 32 can be larger, accommodating assembly tolerances and reducing assembly requirements.

[0309] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery, wherein: include: A battery cell, comprising a housing and a pressure relief component, wherein the housing comprises a first wall portion, the pressure relief component is disposed on the first wall portion, the pressure relief component comprises a first groove, and the pressure relief component is configured to be able to rupture along the first groove when the pressure of the battery cell is released; A support member supports the first wall portion, the support member has a support surface facing the first wall portion, the support surface is provided with an avoidance portion, and along the thickness direction of the first wall portion, the projection of the first groove is located in the avoidance portion.

2. The battery according to claim 1, wherein The avoidance portion forms a first opening on the support surface, and a minimum distance A between a projection of the first groove on the support surface along the thickness direction of the first wall portion and an edge of the first opening satisfies: A≥3mm.

3. The battery according to claim 2, wherein: The first wall portion is a rectangular structure, and the minimum distance between the projection of the first groove along the thickness direction of the first wall portion on the support surface and the edge of the first opening in the length direction of the first wall portion is A1. The minimum distance between the projection of the first groove along the thickness direction of the first wall portion on the support surface and the edge of the first opening in the width direction of the first wall portion is A2, satisfying: A=A2, A2<A1.

4. The battery according to claim 3, wherein: A1≥5mm.

5. The battery according to claim 3 or 4, wherein: The difference between A1 and A2 is less than 10mm.

6. The battery according to any one of claims 1 to 5, wherein: The first groove defines a predetermined pressure relief area, and the pressure relief component includes a second groove, wherein the second groove is configured to guide at least a portion of the predetermined pressure relief area to flip over to open at least a portion of the predetermined pressure relief area; Along the thickness direction of the first wall portion, a projection of the second groove is located within the avoidance portion.

7. The battery according to claim 6, wherein: The avoidance portion forms a first opening on the support surface, and a minimum distance B between a projection of the second groove on the support surface along the thickness direction of the first wall portion and an edge of the first opening satisfies: B≥3mm.

8. The battery according to claim 7, wherein: The first wall portion is a rectangular structure, and the minimum distance between the projection of the second groove along the thickness direction of the first wall portion on the support surface and the edge of the first opening in the length direction of the first wall portion is B1, and the minimum distance between the projection of the second groove along the thickness direction of the first wall portion on the support surface and the edge of the first opening in the width direction of the first wall portion is B2, satisfying: B=B2, B2<B1.

9. The battery according to claim 8, wherein: The first groove and the second groove are arranged along the width direction of the first wall portion, and the minimum distance between the projection of the first groove along the thickness direction of the first wall portion on the support surface and the edge of the first opening in the width direction of the first wall portion is A1, and A1>B1.

10. The battery according to claim 8 or 9, wherein: Along the width direction of the first wall portion, a projection of the second groove on the support surface is located between the projection of the first groove on the support surface and an edge of the first opening.

11. The battery according to any one of claims 8 to 10, wherein: The second grooves are provided on both sides of the first groove along the width direction of the first wall portion.

12. The battery according to any one of claims 6 to 11, wherein: The pressure relief component has a first surface and a second surface that are opposite to each other in the thickness direction of the first wall portion. The first groove is provided on the first surface, and the second groove is provided on the second surface.

13. The battery according to claim 12, wherein: The first surface is a surface of the pressure relief component facing away from the interior of the housing, and the second surface is a surface of the pressure relief component facing the interior of the housing.

14. The battery according to any one of claims 6 to 13, wherein: The first groove includes a first groove section, a second groove section and a third groove section. The first groove section and the third groove section are arranged opposite to each other. The second groove section connects the first groove section and the third groove section. The first groove section, the second groove section and the third groove section define the predetermined pressure relief area.

15. The battery according to claim 14, wherein: The first groove defines two predetermined pressure relief areas, which are respectively located on both sides of the second groove section, and each predetermined pressure relief area is correspondingly provided with at least one second groove.

16. The battery according to claim 15, wherein: Each of the predetermined pressure relief areas is correspondingly provided with a second groove, and the first groove is located between two of the second grooves.

17. The battery according to any one of claims 14 to 16, wherein: The position where the second slot segment is connected to the first slot segment deviates from the two ends of the first slot segment, and the position where the second slot segment is connected to the third slot segment deviates from the two ends of the third slot segment.

18. The battery according to any one of claims 14 to 17, wherein: The first slot section, the second slot section and the third slot section are all spaced apart from the second groove.

19. The battery according to claim 18, wherein: The second slot section and the second groove are arranged opposite to each other along a first direction. Along the first direction, the first slot section and the third slot section are both arranged spaced apart from the second groove.

20. The battery according to claim 19, wherein: The first wall portion is a rectangular structure, and the first direction is parallel to a width direction of the first wall portion.

21. The battery according to any one of claims 1 to 20, wherein: The pressure relief component has a first surface and a second surface arranged opposite to each other in the thickness direction of the first wall portion, and the first groove includes a plurality of grooves arranged in sequence along the direction from the first surface to the second surface. In two adjacent grooves, the first groove away from the first surface is arranged at the groove bottom surface of the first groove close to the first surface.

22. The battery according to any one of claims 1 to 21, wherein: The battery cell includes an electrode terminal, and the electrode terminal is provided on a wall of the housing other than the first wall.

23. The battery according to claim 22, wherein: The electrode terminal is provided on a wall of the housing opposite to the first wall portion.

24. The battery according to any one of claims 1 to 23, wherein: The housing comprises: a housing having a second opening; an end cover connected to the housing and closing the second opening; The end cover is the first wall portion, or the housing includes the first wall portion.

25. The battery according to any one of claims 1 to 24, wherein: The avoidance portion is a through hole or a groove provided on the support member.

26. The battery according to any one of claims 1 to 25, wherein: The avoidance portions correspond to the pressure relief components in a one-to-one manner.

27. The battery according to any one of claims 1 to 26, wherein: At least one of the avoidance portions is provided corresponding to the pressure relief components of the plurality of battery cells.

28. The battery according to claim 27, wherein: The battery includes a plurality of rows of battery cells, and one avoidance portion is provided corresponding to the pressure relief components of at least two battery cells in a row of battery cells.

29. The battery according to claim 27, wherein: The battery includes multiple rows of battery cells, and one avoidance portion is provided corresponding to the pressure relief component of a row of battery cells.

30. The battery according to any one of claims 1 to 29, wherein: The support member is connected to the first wall portion through an adhesive layer.

31. The battery according to claim 30, wherein: The avoidance portion is formed with a first opening on the support surface, and a gap is provided between the adhesive layer and an edge of the first opening.

32. The battery according to any one of claims 1 to 31, wherein The battery includes an electrical cavity and an exhaust cavity. Along the thickness direction of the first wall portion, the electrical cavity and the exhaust cavity are located on both sides of the support member. The electrical cavity is used to accommodate a battery cell, and the exhaust cavity is used to guide gas circulation when the battery cell is depressurized.

33. The battery according to any one of claims 1 to 32, wherein: The support member is configured to enable thermal management of the battery cell.

34. The battery according to any one of claims 1 to 33, wherein The minimum thickness of the support member except the escape portion is greater than the maximum thickness of the first wall portion.

35. An electrical device, wherein: Comprising a battery according to any one of claims 1-34.

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