Battery and electric equipment

Abstract

The utility model provides a battery and electric equipment, and relates to the field of batteries. A battery includes a battery cell and a support. The battery monomer comprises a shell and a pressure relief component, the shell comprises a first wall part, and the pressure relief component is arranged on the first wall part. The pressure relief part comprises a first groove, and the pressure relief part is configured to be capable of cracking along the first groove when the battery monomer is subjected to pressure relief. The supporting piece supports the first wall part and is provided with a supporting face facing the first wall part, and the supporting face is provided with an avoiding part. The projection of the first groove is located in the avoiding part in the thickness direction of the first wall part. The avoiding part is arranged on the supporting piece, and the projection of the first groove in the thickness direction of the first wall part is located in the avoiding part, so that the avoiding part can avoid the first groove, the supporting piece is not easy to abut against the outer side of the first groove when the battery monomer is subjected to pressure relief, the cracking of the first groove is not easy to inhibit, and the service life of the battery monomer is prolonged. Therefore, the first groove can crack in time when the battery monomer is decompressed, and the reliability of the battery is improved.

Description

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 the field of new energy, such as electric vehicles and new energy vehicles. New energy vehicles and electric vehicles have become a new trend in the development of the automotive industry. The development of battery technology must consider many design factors at the same time, such as battery life, energy density, discharge capacity, charge and discharge rate and other performance parameters. In addition, the reliability of the battery must also be considered. However, the reliability of current batteries is poor. Utility Model Content

[0003] 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.

[0004] In the first aspect, an embodiment of the present application provides a battery cell, comprising a battery cell and a support member, wherein the battery cell comprises an outer shell and a pressure relief component, the outer shell comprises a first wall portion, the pressure relief component is arranged on the first wall portion, the pressure relief component comprises a first groove, and the pressure relief component is configured to be able to split 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.

[0005] In the above technical solution, a pressure relief component is provided on the first wall portion of the battery cell. When the battery cell is depressurized, the pressure relief component can be 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 an avoidance portion on the support member and making the projection of the first groove along the thickness direction of the first wall portion located in the avoidance portion, the avoidance portion can avoid the first groove. When the battery cell is depressurized, the support member is not easy to abut against the outside of the first groove, and it is not easy to suppress the deformation of the pressure relief component and the cracking of the first groove. The first groove can be split in time when the battery cell is depressurized, which is conducive to improving the timeliness of the pressure relief of the battery cell and the reliability of the battery.

[0006] 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.

[0007] 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 3mm, in the direction perpendicular to the thickness direction of the first wall, the first groove is farther from the edge of the first opening, and the avoidance effect of the avoidance part on the first groove is better. When the battery cell is depressurized, the support member is less likely to abut against the outer side of the first groove, and the deformation of the pressure relief component is less likely to be suppressed, and the cracking of the first groove is less likely to be suppressed, 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 the reliability of the battery. In addition, by making 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 greater than or equal to 3mm, the first opening of the avoidance part is larger, which can absorb assembly errors and has lower assembly requirements.

[0008] 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 supporting 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 supporting surface and the edge of the first opening in the width direction of the first wall portion is A2, satisfying: A=A2, A2<A1.

[0009] 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. In addition, 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, so that the support member can suppress the deformation of the pressure relief component in the length direction of the first wall less. The first wall portion is a rectangular structure, the stiffness of the pressure relief component in the width direction of the first wall portion changes less, the stiffness of the pressure relief component in the length direction of the first wall portion changes more, the deformation of the pressure relief component in the middle position in the length direction of the first wall portion changes more 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 in the middle position in the width direction of the first wall portion changes less 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 when the battery cell is depressurized, 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 the reliability of the battery.

[0010] As an optional technical solution of the embodiment of the present application, A1≥5mm.

[0011] 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 in the length direction of the first wall is greater than or equal to 5 mm, in the length direction of the first wall, the first groove is farther from the edge of the first opening, and the avoidance effect of the avoidance portion on the first groove is better. When the battery cell is depressurized, the support member is less likely to abut against the outer side of the first groove, and the deformation of the pressure relief component is less likely to be suppressed, and the cracking of the first groove is less likely to be suppressed, 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 the reliability of the battery. In addition, by making 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 greater than or equal to 5 mm, the size of the avoidance portion in the length direction of the first wall is larger, which can absorb assembly errors and has lower assembly requirements.

[0012] As an optional technical solution of an embodiment of the present application, the difference between A1 and A2 is less than 10 mm.

[0013] In the above technical solution, by making the difference between A1 and A2 less than 10mm, 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 small, 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 the reliability of the battery.

[0014] 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, and the second groove 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.

[0015] In the above technical solution, by setting the second groove, the strength of the pressure relief component at the position of the second groove is weakened, so that the predetermined pressure relief area is more likely to be flipped open under the action of the fluid medium, which can not only increase the probability of the predetermined pressure relief area opening, but also increase the opening speed of the predetermined pressure relief area, achieve rapid pressure relief, reduce the risk of battery cell explosion and fire, and help improve the reliability of the battery cell. By setting an avoidance portion on the support member and making the projection of the second groove along the thickness direction of the first wall portion located in the avoidance portion, the avoidance portion can avoid the second groove, and the support member is not easy to abut against the outside of the predetermined pressure relief area when the battery cell is depressurized, and it is not easy to prevent the predetermined pressure relief area from flipping open, so that the predetermined pressure relief area can be flipped open in time when the battery cell is depressurized, which is conducive to improving the timeliness of the pressure relief of the battery cell and the reliability of the battery.

[0016] 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.

[0017] 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 3mm, in the direction perpendicular to the thickness direction of the first wall, the second groove is farther from the edge of the first opening, and the avoidance effect of the avoidance portion on the second groove is better. When the battery cell is depressurized, the support is less likely to abut against the predetermined pressure relief area, and it is less likely to inhibit the predetermined pressure relief area from turning over, so that the predetermined pressure relief area can be turned over and opened in time when the battery cell is depressurized, which is beneficial to improving the timeliness of the pressure relief of the battery cell and the reliability of the battery. In addition, by making 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 greater than or equal to 3mm, the first opening of the avoidance portion is larger, which can absorb assembly errors and has lower assembly requirements.

[0018] 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 second groove along the thickness direction of the first wall portion on the supporting 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 supporting surface and the edge of the first opening in the width direction of the first wall portion is B2, satisfying: B=B2, B2<B1.

[0019] 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. In addition, 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, so that the support member has less suppression on the deformation of the pressure relief component in the length direction of the first wall. The first wall portion is a rectangular structure, the stiffness of the pressure relief component in the width direction of the first wall portion changes slightly, 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 in the middle position in the length direction of the first wall portion changes significantly compared with 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 in the middle position in the width direction of the first wall portion changes slightly compared with 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 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 is depressurized, and the predetermined pressure relief area is promptly flipped open when the battery cell is depressurized, which is beneficial to improving the timeliness of the pressure relief of the battery cell and the reliability of the battery.

[0020] 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.

[0021] 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, so that 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.

[0022] 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.

[0023] In the above technical solution, by making the projection of the second groove on the supporting surface between the projection of the first groove on the supporting 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.

[0024] As an optional technical solution of an embodiment of the present application, the second grooves are arranged on both sides of the first groove along the width direction of the first wall portion.

[0025] In the above technical solution, by arranging the 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 is pressure-released, 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.

[0026] As an optional technical solution of the 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.

[0027] 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.

[0028] As an optional technical solution of an embodiment of the present application, the first surface is a surface of the pressure relief component facing away from the interior of the shell, and the second surface is a surface of the pressure relief component facing the interior of the shell.

[0029] In the above technical solution, by arranging the first groove on the surface of the pressure relief component facing away from the inside of the shell, the tension that the first groove needs to overcome when cracking is small, and it is easy to crack. By arranging the second groove on the surface of the pressure relief component facing the inside of the shell, the tension that the predetermined pressure relief area needs to overcome when flipping is small, so that the predetermined pressure relief area is easy to flip open quickly, which is beneficial to improving the reliability of the battery cell.

[0030] 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.

[0031] 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 is relieved of pressure, so as to open the predetermined pressure relief area to release the internal pressure of the battery cell. The first groove with such a 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, and is 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.

[0032] As an optional technical solution of an embodiment of the present application, the first groove defines two predetermined pressure relief areas, 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 arranged for each predetermined pressure relief area.

[0033] In the above technical solution, the first groove defines two predetermined pressure relief areas, each of which is correspondingly provided with at least one second groove. When the battery cell is pressure-released, the two predetermined pressure relief areas are flipped open under the guidance of the 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.

[0034] As an optional technical solution of an embodiment of the present application, a second groove is correspondingly arranged in each of the predetermined pressure relief areas, and the first groove is located between two of the second grooves.

[0035] In the above technical solution, the predetermined pressure relief area corresponds to the second groove one by one, which can reduce the number of second grooves, reduce the number of times the pressure relief component is processed, and reduce the stress of the pressure relief component. The first groove is set between the two second grooves. When the battery cell is depressurized, the pressure relief component can be split along the first groove section, the second groove section and the third groove section, thereby opening the two predetermined pressure relief areas, so that the two predetermined pressure relief areas are flipped open under the guidance of the corresponding second grooves, so that the battery cell has a larger pressure relief area, which is conducive to improving the pressure relief rate of the battery cell and improving the reliability of the battery cell.

[0036] 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.

[0037] In the above technical solution, by setting the connection position between the second groove section and the first groove section to be located between the two ends of the second groove section, and setting the connection position between the second groove section and the third groove section to be located between the two ends of the third groove section, so that the first groove section, the second groove section and the third groove section form a structure similar to an "H" shape, both sides of the second groove section of the first groove can form a predetermined pressure relief area, and the two predetermined pressure relief areas can be opened in a split manner for pressure relief 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.

[0038] 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.

[0039] 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, and 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 pressure relief component is set with the first groove and the area where the pressure relief component is set with the second groove can be reduced.

[0040] 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 at intervals from the second groove.

[0041] In the above technical solution, by making the second groove section and the second groove be arranged opposite to each other along the first direction, the first groove section and the third groove section are both arranged spaced apart from the second groove in the first direction, so that the predetermined pressure relief area defined by the first groove section, the second groove section and the third groove section can be flipped around the area where the second groove is provided in the pressure relief component when it is opened, and the flipping angle of the predetermined pressure relief area after being opened can be increased, so as to increase the pressure relief area of ​​the battery cell.

[0042] 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.

[0043] In the above technical solution, the second groove section and the second groove are arranged along the width direction of the first wall portion, and along the width direction of the first wall portion, the first groove section and the third groove section are spaced from the second groove. The space in the width direction of the first groove section is large, and it is easy to process the first groove and the second groove. In addition, during production, the detonation pressure of multiple battery cells processed is relatively consistent.

[0044] 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 plurality of grooves arranged in sequence from the first surface to the second surface, and in two adjacent levels of the grooves, a first-level groove away from the first surface is arranged on the groove bottom surface of the first-level groove close to the first surface.

[0045] 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 molded 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 easy to fail due to cracks in the position where the grooves are set, thereby improving the reliability of the battery cell. When molding 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. In this way, it is helpful to reduce the risk of leakage in the pressure relief component.

[0046] As an optional technical solution of the embodiment of the present application, the battery cell includes an electrode terminal, and the electrode terminal is arranged on other walls of the housing except the first wall portion.

[0047] 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 easy 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.

[0048] As an optional technical solution of the embodiment of the present application, the electrode terminal is arranged on a wall of the housing opposite to the first wall portion.

[0049] 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 sprayed 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.

[0050] 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.

[0051] In the above technical solution, when the end cover is the first wall portion, the pressure relief component is arranged on the end cover, which is simple and convenient to manufacture. When the shell includes the first wall portion, the pressure relief component is arranged on a wall of the shell, and the fluid medium sprayed by the pressure relief component is not easy to act on other electrical connection structures on the end cover, which is conducive to reducing the risk of short circuit of the battery cell.

[0052] As an optional technical solution of the embodiment of the present application, the avoidance portion is a through hole or a groove arranged on the support member.

[0053] In the above technical solution, a through hole or a groove is formed on the support member as an avoidance portion, which is simple, convenient and easy to manufacture.

[0054] As an optional technical solution of the embodiment of the present application, the avoidance portion corresponds one-to-one with the pressure relief component.

[0055] In the above technical solution, by making the avoidance part correspond to the pressure relief component one by one, each pressure relief component can have an avoidance effect, so that each battery cell can release pressure smoothly, which is beneficial to improving the reliability of the battery. In addition, since the avoidance part corresponds to the pressure relief component one by one, a single avoidance part can be set smaller, and the structure left between two adjacent avoidance parts can be regarded as a reinforcing rib, so that the support member has a higher strength.

[0056] 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.

[0057] In the above technical solution, one avoidance portion can be set corresponding to the pressure relief components of multiple battery cells, and the structure left between two adjacent avoidance portions can be regarded as a reinforcing rib, so that the support member has a higher strength. In addition, a single avoidance portion can be set larger, which can absorb assembly tolerance and reduce assembly requirements.

[0058] As an optional technical solution of the embodiment of the present application, the battery includes a plurality of rows of battery cells, and one avoidance portion is arranged corresponding to the pressure relief components of at least two battery cells in a row of battery cells.

[0059] In the above technical solution, the battery includes multiple rows of battery cells. Correspondingly, the avoidance parts can also be arranged 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.

[0060] As an optional technical solution of the embodiment of the present application, the battery includes a plurality of rows of battery cells, and one avoidance portion is arranged corresponding to a pressure relief component of a row of battery cells.

[0061] 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 one row of battery cells. This is conducive to absorbing assembly tolerances and reducing assembly requirements.

[0062] 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.

[0063] In the above technical solution, the support member is bonded and fixed to the wall portion, so that the battery cell can be stably connected to the support member, reducing the risk of the battery cell detaching from the support member during use of the battery, and the assembly difficulty and cost are relatively low.

[0064] 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.

[0065] 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 easy to inhibit the deformation of the pressure relief component and the cracking of the first groove, so that the first groove can be cracked in time when the battery cell releases pressure, which is beneficial to improving the timeliness of the pressure relief of the battery cell and the reliability of the battery.

[0066] 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.

[0067] 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 easy to act on the battery cell in the electrical cavity, and is not easy to cause a short circuit in the battery cell, which is beneficial to improving the reliability of the battery.

[0068] 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.

[0069] In the above technical solution, the support 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 exert its performance. One support component can play multiple functions, which is conducive to simplifying the structure of the battery.

[0070] As an optional technical solution of an embodiment of the present application, the minimum thickness of the support member except the avoidance portion is greater than the maximum thickness of the first wall portion.

[0071] 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.

[0072] In a second aspect, an embodiment of the present application further provides an electrical device, wherein the electrical device comprises the above-mentioned battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0073] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. 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 related drawings can be obtained based on these drawings without paying creative work.

[0074] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0075] Figure 2 An exploded view of the structure of a battery provided in some embodiments of the present application;

[0076] Figure 3 A schematic diagram of the structure of a battery cell and a support member provided in some embodiments of the present application;

[0077] Figure 4 A cross-sectional view of a battery cell and a support member provided in some embodiments of the present application;

[0078] Figure 5 for Figure 4 A magnified view of position A in the middle;

[0079] Figure 6 A bottom view schematic diagram of a battery cell and a support member provided in some embodiments of the present application;

[0080] Figure 7 for Figure 6 A magnified view of position B in the middle;

[0081] Figure 8 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0082] Fig. 9 An exploded view of a battery cell provided for some embodiments of the present application;

[0083] Fig.10 A schematic diagram of the structure of a battery cell and a support member provided in some other embodiments of the present application;

[0084] Fig.11Cross-sectional views of battery cells and support members provided in other embodiments of the present application;

[0085] Fig.12 A schematic diagram of the structure of a battery cell and a support member provided in some other embodiments of the present application;

[0086] Fig.13 A cross-sectional view of a battery cell and a support member provided in some other embodiments of the present application;

[0087] Fig.14 Cross-sectional views of battery cells and support members provided in some further embodiments of the present application.

[0088] 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

[0089] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0090] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. 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 and secondary relationship.

[0091] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0092] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0093] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0094] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0095] The term "plurality" used in the present application refers to two or more (including two).

[0096] 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.

[0097] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0098] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and removed between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0099] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet 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.

[0100] 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 disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0101] 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 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.).

[0102] 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 positive electrode active materials for batteries can also be used. These positive electrode active materials can 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 NCM622 )、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 0.05 O2) and its modified compounds, etc.

[0103] In some embodiments, the positive electrode may be a foamed metal. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, etc. When the foamed metal is used as the positive electrode, the positive electrode active material may not be provided on the surface of the foamed metal, but of course, the positive electrode active material may also be provided. As an example, a lithium source material, potassium metal or sodium metal may also be filled or / and deposited in the foamed metal, and the lithium source material is lithium metal and / or a lithium-rich material.

[0104] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0105] As an example, the negative electrode current collector may be a metal foil, a foamed metal or a composite current collector. For example, as the metal foil, aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, nickel or titanium with a silver surface treatment may be used. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, etc. The composite current collector may include a polymer material base 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.).

[0106] 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.

[0107] 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 disposed on either or both of the two facing surfaces of the negative electrode current collector.

[0108] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells 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.

[0109] 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.

[0110] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0111] In some embodiments, the separator is a separator membrane. There may be many types of separator membranes, and any known porous separator membrane with good chemical stability and mechanical stability may be selected.

[0112] As an example, the material of the separator may include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer may be the same or different. The separator may be a separate component located between the positive and negative electrodes, or may be attached to the surface of the positive and negative electrodes.

[0113] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0114] In some embodiments, the battery cell further includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes. The electrolyte can be liquid, gel or solid. Among them, the liquid electrolyte includes an electrolyte salt and a solvent.

[0115] 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 dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0116] In some embodiments, the solvent may include at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl 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.

[0117] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0118] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0119] 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, and the like.

[0120] 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.

[0121] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0122] 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.

[0123] In some embodiments, the electrode assembly is a laminate structure.

[0124] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked.

[0125] 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.

[0126] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded sections that are stacked.

[0127] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0128] As an example, the separator may be disposed continuously, and may be disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0129] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0130] In some embodiments, the electrode assembly is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0131] In some embodiments, the 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 (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0132] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes but is not limited to a square-shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery, etc.

[0133] 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.

[0134] 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.

[0135] 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 accommodated in the case.

[0136] 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.

[0137] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0138] Batteries are widely used in the field of new energy, such as electric vehicles and new energy vehicles. New energy vehicles and electric vehicles have become a new trend in the development of the automotive industry. The development of battery technology must consider many design factors at the same time, such as battery life, energy density, discharge capacity, charge and discharge rate and other performance parameters. In addition, the reliability of the battery must also be considered. However, the reliability of current batteries is poor.

[0139] For battery cells, in order to improve the reliability of battery cells, the prior art 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 explosion and fire of the battery cells.

[0140] 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, causing the pressure relief mechanism to be unable to open or open 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.

[0141] In view of this, an embodiment of the present application provides a battery cell, which includes a battery cell and a support member. The battery cell includes a housing and a pressure relief component, the housing includes a first wall portion, and 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 split along the first groove when the battery cell is depressurized. The support member supports the first wall portion, the support member has a supporting surface facing the first wall portion, and the supporting surface is provided with an avoidance portion. Along the thickness direction of the first wall portion, the projection of the first groove is located within the avoidance portion.

[0142] A pressure relief component is provided on the first wall of the battery cell. When the battery cell is depressurized, the pressure relief component can be 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 an avoidance portion on the support member and making the projection of the first groove along the thickness direction of the first wall portion located in the avoidance portion, the avoidance portion can avoid the first groove. When the battery cell is depressurized, the support member is not easy to abut against the outside of the first groove, and it is not easy to suppress the deformation of the pressure relief component and the cracking of the first groove. The first groove can be split in time when the battery cell is depressurized, which is conducive to improving the timeliness of the pressure relief of the battery cell and the reliability of the battery.

[0143] The battery disclosed in the embodiment of the present application can be used in, but not limited to, electrical devices such as vehicles, ships or aircraft. The battery disclosed in the present application can be used to form a power supply system of the electrical device, which is beneficial to improve the reliability of the battery cell.

[0144] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, 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., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0145] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0146] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided 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 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source or a power source for the vehicle 1000, etc. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for the starting, navigation and working power requirements of the vehicle 1000 during driving.

[0147] In some embodiments of the present application, the battery 100 can not only serve as an operating power source or a use power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0148] Please refer to Figure 2 , Figure 2 The structure of the battery 100 provided in some embodiments of the present application is exploded. The battery 100 includes a box body 10 and a battery cell 20, and the battery cell 20 is used to be accommodated in the box body 10.

[0149] The box body 10 is used to provide an assembly space for the battery cell 20, and the box body 10 can adopt a variety of structures. In some embodiments, the box body 10 may include a first box body 11 and a second box body 12, the first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cell 20. The second box body 12 may be a hollow structure with one end open, and the first box body 11 may be a plate-like structure, and the first box body 11 covers the open side of the second box body 12, so that the first box body 11 and the second box body 12 jointly define an assembly space; the first box body 11 and the second box body 12 may also be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12.

[0150] 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. Figure 2 In the embodiment, the box body 10 is in the shape of a rectangular parallelepiped.

[0151] In the battery 100, the battery cell 20 disposed in the box 10 may be one or more. When there are more than one battery cell 20 disposed in the box 10, the multiple battery cells 20 may be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10; of course, the battery 100 may also be a battery = module form in which multiple battery cells 20 are first connected in series, in parallel, or in mixed connection, and multiple battery modules are then connected in series, in parallel, or in mixed connection to form a whole, and the whole is accommodated in the box 10.

[0152] 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 plurality of battery cells 20 to achieve electrical connection between the plurality of battery cells 20 .

[0153] Each battery cell 20 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be a rectangular parallelepiped, a cylinder, a prism or other shapes. For example, the battery cell 20 is a rectangular parallelepiped structure.

[0154] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Fig. 9 , Figure 3This is a schematic structural diagram of a battery cell 20 and a support member 30 provided in some embodiments of the present application. Figure 4 A cross-sectional view of a battery cell 20 and a support member 30 provided in some embodiments of the present application. Figure 5 for Figure 4 Enlarged view of position A in the middle. Figure 6 A bottom view of a battery cell 20 and a support member 30 provided in some embodiments of the present application. Figure 7 for Figure 6 Enlarged view of position B in the middle. Figure 8 This is a schematic diagram of the structure of a battery cell 20 provided in some embodiments of the present application. Fig. 9 An exploded view of a battery cell 20 provided for 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 housing 21 and a pressure relief component 212, the housing 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 the pressure relief component 212 is configured to be able to split along the first groove 2121 when the battery cell 20 releases pressure. The support member 30 supports the first wall portion 211, and the support member 30 has a support surface 31 facing the first wall portion 211, and the support surface 31 is provided with an avoidance portion 32. Along the thickness direction of the first wall portion 211, the projection of the first groove 2121 is located within the avoidance portion 32.

[0155] The battery cell 20 refers to the smallest unit constituting the battery 100 .

[0156] 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 .

[0157] 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), so that the end cap 213 is not easily deformed when it is squeezed and collided, so that the battery cell 20 can have a higher structural strength and the safety performance can also be improved. 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. Exemplarily, the insulating member can be plastic, rubber, etc.

[0158] The shell 214 is a component used to cooperate 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, the electrolyte and other components. The shell 214 and the end cap 213 can be independent components, and a second opening 2141 can be set on the shell 214, and the end cap 213 is covered with the second opening 2141 at the second opening 2141 to form the internal environment of the battery cell 20. Without limitation, the end cap 213 and the shell 214 can also be integrated. Specifically, the end cap 213 and the shell 214 can form a common joint surface before other components are put into the shell, and when it is necessary to encapsulate the interior of the shell 214, the end cap 213 is covered with the shell 214. The shell 214 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 214 can be determined according to the specific shape and size of the electrode assembly 22. The shell 214 can be made of a variety of 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.

[0159] The electrode assembly 22 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 22 may be included 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 lug. The positive electrode lug and the negative electrode lug 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.

[0160] The first wall portion 211 may be an end cover 213 of the housing 21, or may be a wall of a shell 214 of the housing 21. Figure 8 and Fig. 9 In the embodiment, the first wall portion 211 is a bottom wall of the housing 214 disposed opposite to the end cover 213. In other embodiments, the first wall portion 211 may also be a side wall of the housing 214 adjacent to the end cover 213 and connected to each other.

[0161] The pressure relief component 212 may be a component installed on the first wall portion 211, in which case the pressure relief component 212 is separately arranged and connected to the first wall portion 211. For example, the pressure relief component 212 is an explosion-proof disk installed on the first wall portion 211. The pressure relief component 212 may also be a part of the first wall portion 211, in which case the pressure relief component 212 is integrally formed with the first wall portion 211. The setting position 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 arranged on the end cover 213, the end cover 213 is the first wall portion 211. When the pressure relief component 212 is arranged on the bottom wall of the housing 214, the bottom wall is the first wall portion 211. When the pressure relief component 212 is arranged on the side wall of the housing 214, the side wall is the first wall portion 211.

[0162] 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 to release the pressure inside the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

[0163] Optionally, the first groove 2121 may be disposed on a side of the pressure relief component 212 facing the interior of the housing 21, or may be disposed on a side of the pressure relief component 212 facing away from the interior of the housing 21. Figure 4 and Figure 5 In the embodiment, the first groove 2121 is disposed on the side of the pressure relief component 212 facing away from the interior of the housing 21 , that is, the first groove 2121 is disposed on the surface of the pressure relief component 212 facing away from the interior of the housing 21 .

[0164] The support member 30 is a component for supporting 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, and the bottom support plate supports the first wall portion 211 of the battery cell 20. In other embodiments, the support member 30 may be a part of the box 10, for example, the support member 30 is the bottom wall of the box 10, and the bottom wall of the box 10 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, the support member 30 is a water cooling plate, and the water cooling plate supports the first wall portion 211 of the battery cell 20.

[0165] 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 some intermediate component.

[0166] The avoidance portion 32 is a structure for avoiding the first groove 2121, and the avoidance portion 32 is provided on the support member 30, specifically, the avoidance portion 32 is provided on the support surface 31 of the support member 30. In some embodiments, the avoidance portion 32 is a through hole, and the through hole passes through the support surface 31 and the surface of the support member 30 opposite to the support surface 31. In other embodiments, the avoidance portion 32 is a groove, and the groove is recessed from the support surface 31 to the direction away from the first wall portion 211.

[0167] Please refer to Figure 3 , Figure 4 and Figure 5 , the thickness direction of the first wall portion 211 may be the X direction shown in the figure.

[0168] The avoidance portion 32 is formed with a first opening 321 on the support surface 31. “Along the thickness direction of the first wall portion 211, the projection of the first groove 2121 is located inside the avoidance 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 inside the first opening 321.

[0169] A pressure relief component 212 is provided on the first wall portion 211 of the battery cell 20. When the battery cell 20 is depressurized, the pressure relief component 212 can be split 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 providing 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 in 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 outer side 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. The first groove 2121 can be split in time when the battery cell 20 is depressurized, which is conducive to improving the timeliness of the pressure relief of the battery cell 20 and the reliability of the battery 100.

[0170] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 The avoidance portion 32 forms a first opening 321 on the support surface 31. 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 A, which satisfies: A ≥ 3 mm.

[0171] The avoidance portion 32 has a peripheral wall, and the peripheral wall intersects with the support surface 31 to form an edge line, and the edge line surrounds the first opening 321 .

[0172] 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).

[0173] The minimum distance between the projection of the first groove 2121 on the supporting 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.

[0174] 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 outer side 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 the reliability of the battery 100. In addition, by making 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 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.

[0175] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 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: A=A2, A2<A1.

[0176] Please refer to Figure 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.

[0177] The first opening 321 has a first short side and a second short side that are arranged opposite to each other along the length direction 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 first short side is the first distance, and 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 short side is the second distance, and A1 represents the minimum distance between the first distance and the second distance.

[0178] 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 arranged opposite to each other. 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 the third distance, and 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 the fourth distance, and A2 represents the minimum distance between the third distance and the fourth distance.

[0179] 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.

[0180] 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.

[0181] 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 rigidity of the pressure relief component 212 in the width direction of the first wall portion 211 changes slightly, while the rigidity 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 in the middle position in the length direction of the first wall portion 211 changes significantly compared with 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 in the middle position in the width direction of the first wall portion 211 changes slightly compared with 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 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 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, and allows 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 the reliability of the battery 100.

[0182] In some embodiments, A1 ≥ 5 mm.

[0183] 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.

[0184] When the minimum distance between the projection of the first groove 2121 on the supporting 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 outer side 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 the reliability of the battery 100. In addition, by making 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 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.

[0185] In some embodiments, the difference between A1 and A2 is less than 10 mm.

[0186] “The difference between A1 and A2 is less than 10mm” means: A1-A2<10mm.

[0187] 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 easier 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 releases pressure, which is beneficial to improving the timeliness of the pressure relief of the battery cell 20 and the reliability of the battery 100.

[0188] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 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, and the second groove 2124 is configured to guide at least a portion of the predetermined pressure relief area 21211 to flip 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 in the avoidance portion 32.

[0189] The first groove 2121 defines a predetermined pressure relief area 21211 . When the battery cell 20 releases pressure, the first groove 2121 is cracked along the edge of the predetermined pressure relief area 21211 , so that the predetermined pressure relief area 21211 can be opened to release pressure.

[0190] 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 is depressurized, the pressure relief component 212 first splits along the first groove 2121 to allow the fluid medium in the battery cell 20 to flow out and release pressure. Afterwards, the predetermined pressure relief area 21211 can flip outward with the second groove 2124 as the rotation axis under the action of the fluid medium to open a larger first opening 321 to achieve rapid pressure relief.

[0191] The second groove 2124 can be disposed on the same side of the pressure relief component 212 as the first groove 2121, or can be disposed on both sides of the pressure relief component 212. Figure 4 and Figure 5 In the embodiment, 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 inside of the housing 21, and the second groove 2124 is arranged on the side of the pressure relief component 212 facing the inside of the housing 21.

[0192] Exemplarily, the first groove 2121 and the second groove 2124 are both formed by a stamping process.

[0193] By providing the second groove 2124, the strength of the pressure relief component 212 at the position of the second groove 2124 is weakened, so that the predetermined pressure relief area 21211 is more likely to be turned over and opened under the action of the fluid medium, which can not only increase the probability of the predetermined pressure relief area 21211 opening, but also increase the opening speed of the predetermined pressure relief area 21211, achieve rapid pressure relief, reduce the risk of explosion and fire of the battery cell 20, and help improve the reliability of the battery cell 20. By providing the 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 located in the avoidance portion 32, the avoidance portion 32 can avoid the second groove 2124, and the support member 30 is not easy to abut against the outside of the predetermined pressure relief area 21211 when the battery cell 20 is depressurized, and it is not easy to prevent the predetermined pressure relief area 21211 from turning over and opening, so that the predetermined pressure relief area 21211 can be turned over and opened in time when the battery cell 20 is depressurized, which is conducive to improving the timeliness of the pressure relief of the battery cell 20 and the reliability of the battery 100.

[0194] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 In some embodiments, the avoidance portion 32 forms a first opening 321 on the support surface 31. 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 B, satisfying: B ≥ 3 mm.

[0195] 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).

[0196] 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.

[0197] 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 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 211, the second groove 2124 is farther from the edge of the first opening 321, and the avoidance effect of the avoidance portion 32 on the second groove 2124 is better. When the battery cell 20 is depressurized, the support member 30 is less likely to abut against the predetermined pressure relief area 21211, and is less likely to inhibit the predetermined pressure relief area 21211 from turning over, so that the predetermined pressure relief area 21211 can turn over and open in time when the battery cell 20 is depressurized, which is conducive to improving the timeliness of the pressure relief of the battery cell 20 and the reliability of the battery 100. In addition, by making the minimum distance between the projection of the second groove 2124 on the support surface 31 along the thickness direction of the first wall 211 and the edge of the first opening 321 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.

[0198] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 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: B = B2, B2 < B1.

[0199] 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.

[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 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 shortest distance between the seventh distance and the eighth distance.

[0201] 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.

[0202] 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.

[0203] 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 rigidity of the pressure relief component 212 in the width direction of the first wall portion 211 changes slightly, while the rigidity 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 in the middle position in the length direction of the first wall portion 211 changes significantly compared with 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 in the middle position in the width direction of the first wall portion 211 changes slightly compared with 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 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 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, and allows 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 the reliability of the battery 100.

[0204] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 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 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 A1, and A1>B1.

[0205] 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 from each other, or the first groove 2121 and the second groove 2124 may be connected.

[0206] 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.

[0207] 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 , so that the support member 30 is not easy to suppress the cracking of the first groove 2121 , so that the first groove 2121 can be cracked in time when the battery cell 20 releases pressure.

[0208] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 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 .

[0209] “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.

[0210] 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.

[0211] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 In some embodiments, along the width direction of the first wall portion 211 , second grooves 2124 are provided on both sides of the first groove 2121 .

[0212] 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 may be one or more.

[0213] By arranging the 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 is pressure-released, the two predetermined pressure relief areas 21211 are respectively 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.

[0214] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 In some embodiments, the pressure relief component 212 has a first surface 2122 and a second surface 2123 that are oppositely arranged 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 .

[0215] The first groove 2121 is disposed on the first surface 2122 , and the second groove 2124 is disposed on the second surface 2123 . The first groove 2121 and the second groove 2124 are respectively located on two surfaces of the pressure relief component 212 that are oppositely disposed along the thickness direction of the first wall portion 211 .

[0216] 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.

[0217] The first groove 2121 and the second groove 2124 are formed by stamping or cold heading, so that the groove walls of the first groove 2121 and the second groove 2124 are cold-work hardened (the grain arrangement changes, resulting in lattice distortion, which reduces the metal plasticity and increases the material hardness), and the ability to resist external impact is enhanced, and it is not easy to be damaged by external impact. In this way, the risk of leakage of the pressure relief component 212 is reduced.

[0218] 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.

[0219] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 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 .

[0220] The first surface 2122 is the surface of the pressure relief component 212 facing away from the inside 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 inside of the housing 21, that is, the inner surface of the pressure relief component 212.

[0221] The first groove 2121 is disposed on the outer surface of the pressure relief component 212 , and the second groove 2124 is disposed on the inner surface of the pressure relief component 212 .

[0222] By arranging the first groove 2121 on the surface of the pressure relief component 212 facing away from the inside of the housing 21, the tension that the first groove 2121 needs to overcome when cracking is small, and it is easy to crack. By arranging the second groove 2124 on the surface of the pressure relief component 212 facing the inside of the housing 21, the tension that the predetermined pressure relief area 21211 needs to overcome when flipping is small, so that the predetermined pressure relief area 21211 can be quickly flipped open, which is beneficial to improving the reliability of the battery cell 20.

[0223] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 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 to 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.

[0224] The first slot section 2121a and the third slot section 2121c are arranged at intervals 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 .

[0225] 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.

[0226] Please refer to Figure 7 The line connecting the free end of the first slot section 2121a and the free end of the second slot section 2121b is the first line, and the first line is arranged opposite to the second slot section 2121b along the width direction of the first wall portion 211. The closed area enclosed by the first slot section 2121a, the second slot section 2121b, the third slot section 2121c and the first line is the predetermined pressure relief area 21211. That is to say, the first groove section 2121a, the second groove section 2121b and the third groove 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 groove section 2121a, the second groove section 2121b and the third groove section 2121c as boundaries, that is to say, the predetermined pressure relief area 21211 is formed in the area enclosed by the first groove section 2121a, the second groove section 2121b and the third groove 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 groove section 2121a, the second groove section 2121b and the third groove section 2121c as boundaries when the battery cell 20 is depressurized, thereby releasing the internal pressure of the battery cell 20.

[0227] 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 be split along the first groove section 2121a, the second groove section 2121b and the third groove section 2121c when the battery cell 20 is pressure-relieved, 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 such a 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, and is easier to split and open the predetermined pressure relief area 21211 for pressure relief, and can further increase the pressure relief area and pressure relief rate of the battery cell 20.

[0228] 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. In this way, the connection between the fourth groove section 2121d and the second groove section 2121b is weaker, and it is easier to split and open the predetermined pressure relief area 21211 for pressure relief, and the pressure relief area and pressure relief rate of the battery cell 20 can be further increased.

[0229] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 In some embodiments, the first groove 2121 defines two predetermined pressure relief areas 21211, and the two predetermined pressure relief areas 21211 are respectively located on both sides of the second groove section 2121b. At least one second groove 2124 is correspondingly provided for each predetermined pressure relief area 21211.

[0230] See also Figure 7 As shown, the shape of the first groove 2121 formed by the first groove section 2121a, the second groove section 2121b and the third groove section 2121c can be 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.

[0231] 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, see Figure 7 As shown, each predetermined pressure relief area 21211 is correspondingly provided with a second groove 2124 .

[0232] 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 is pressure-relieved, the two predetermined pressure relief areas 21211 are flipped open under the guidance of the 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.

[0233] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 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 .

[0234] The predetermined pressure relief area 21211 corresponds to the second grooves 2124 one by one. 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 .

[0235] See also Figure 7 As shown, 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 2121 a , the second groove section 2121 b and the third groove section 2121 c are all located between the two second grooves 2124 .

[0236] The predetermined pressure relief area 21211 corresponds to the second groove 2124 one by one, which can reduce the number of second grooves 2124, reduce the number of times the pressure relief component 212 is processed, and reduce the stress of the pressure relief component 212. The first groove 2121 is set between the two second grooves 2124. When the battery cell 20 is depressurized, the pressure relief component 212 can be 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, so that the two predetermined pressure relief areas 21211 are respectively turned over and opened under the guidance of the corresponding second grooves 2124, so that the battery cell 20 has a larger pressure relief area, which is conducive to improving the pressure relief rate of the battery cell 20 and improving the reliability of the battery cell 20.

[0237] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 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.

[0238] Among them, the connection position of the second groove segment 2121b and the first groove segment 2121a deviates from the two ends of the first groove segment 2121a, that is, the second groove segment 2121b is connected between the two ends of the first groove segment 2121a. Similarly, the connection position of the third groove segment 2121c and the second groove segment 2121b deviates from the two ends of the third groove segment 2121c, that is, the second groove segment 2121b is connected between the two ends of the third groove segment 2121c, so that the shape of the first groove 2121 formed by the first groove segment 2121a, the second groove segment 2121b and the third groove segment 2121c is a structure approximately in an "H" shape.

[0239] 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 both sides of the second groove section 2121b of the first groove 2121 can form a predetermined pressure relief area 21211, 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.

[0240] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 In some embodiments, the first slot segment 2121a, the second slot segment 2121b and the third slot segment 2121c are all spaced apart from the second groove 2124.

[0241] 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.

[0242] 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.

[0243] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 In some embodiments, the second slot segment 2121b is disposed opposite to the second groove 2124 along the first direction. The first slot segment 2121a and the third slot segment 2121c are both disposed spaced apart from the second groove 2124 along the first direction.

[0244] Along the first direction, the second slot section 2121b is arranged opposite to the second groove 2124, and the first slot section 2121a and the third slot section 2121c are arranged at intervals from the second groove 2124. There is a distance between the first slot section 2121a and the second groove 2124 in the direction in which the second slot section 2121b and the second groove 2124 are arranged opposite to each other. There is a distance between the third slot section 2121c and the second groove 2124 in the direction in which the second slot section 2121b and the second groove 2124 are arranged opposite to each other.

[0245] By arranging the second groove section 2121b and the second groove 2124 relative to each other along the first direction, the first groove section 2121a and the third groove 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 groove section 2121a, the second groove section 2121b and the third groove section 2121c can be flipped around the area of ​​the pressure relief component 212 where the second groove 2124 is provided when being opened, and the flipping angle of the predetermined pressure relief area 21211 after being opened can be increased, so as to increase the pressure relief area of ​​the battery cell 20.

[0246] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 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 .

[0247] The second groove section 2121b and the second groove 2124 are arranged along the width direction 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 direction of the first wall portion 211. The first groove section 2121a has a larger space in the width direction, which makes it easy to process the first groove 2121 and the second groove 2124. In addition, during production, the detonation pressures of the processed multiple battery cells 20 are relatively consistent.

[0248] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 In some embodiments, the pressure relief component 212 has a first surface 2122 and a second surface 2123 that are arranged opposite to each other in the thickness direction of the first wall portion 211. The first groove 2121 includes multiple levels of grooves that are sequentially arranged from the first surface 2122 to the second surface 2123. In two adjacent levels of grooves, the first level groove away from the first surface 2122 is arranged at the groove bottom surface of the first level groove close to the first surface 2122.

[0249] The pressure relief component 212 is provided with multiple grooves, which are sequentially arranged on the pressure relief component 212 from the first surface 2122 to the second surface 2123, and the contour of the bottom surface of the multiple grooves decreases step by step. The cross-sectional shape of the groove can be various, such as rectangular, circular, etc. The groove on the pressure relief component 212 can be processed and formed in various ways, such as stamping, cold heading, etc.

[0250] For example, Figure 4 and Figure 5 As shown, the pressure relief component 212 is provided with three levels of grooves, namely, the first level groove, the second level groove and the third level groove. During processing and forming, the first level groove can be firstly punched on the first surface 2122, and then the second level groove can be punched on the bottom surface of the first level groove, and finally the third level groove can be punched on the bottom surface of the second level groove.

[0251] 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 .

[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 molded 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 at the position where the grooves are arranged, thereby improving the reliability of the battery cell 20. When molding the multi-level grooves, stamping or cold heading can be used, so that the groove wall of the groove 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. In this way, it is helpful to reduce the risk of leakage of the pressure relief component 212.

[0253] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Fig. 9 In some embodiments, the battery cell 20 includes an electrode terminal 23 , and the electrode terminal 23 is disposed on other walls of the housing 21 except the first wall portion 211 .

[0254] The electrode terminal 23 and the pressure relief component 212 are arranged 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 arranged on the side wall of the housing 214 or the end cover 213. For another example, when the first wall portion 211 is a side wall of the housing 214, the electrode terminal 23 can be arranged on other side walls, the bottom wall or the end cover 213 of the housing 214. When the first wall portion 211 is the end cover 213, the electrode terminal 23 can be arranged on the side wall or the bottom wall of the housing 214.

[0255] 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 easy 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.

[0256] Optionally, the electrode terminal 23 is disposed on a wall of the housing 21 opposite to the first wall portion 211 .

[0257] When the first wall portion 211 is the bottom wall of the housing 214, the electrode terminal 23 may be disposed on the end cap 213. When the first wall portion 211 is one side wall of the housing 214, the electrode terminal 23 may be disposed on the other side wall of the housing 214 opposite to the first wall portion 211. When the first wall portion 211 is the end cap 213, the electrode terminal 23 may be disposed on the bottom wall of the housing 214.

[0258] 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.

[0259] 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, and each current collecting component 24 is used to connect an electrode terminal 23 and a plurality of electrode assemblies 22 with the same polarity 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 lug and the electrode terminal 23.

[0260] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Fig. 9In some embodiments, the housing 21 includes a shell 214 and an end cover 213, the shell 214 has a second opening 2141, and the end cover 213 is connected to the shell 214 and closes the second opening 2141. The end cover 213 is the first wall portion 211, or the shell 214 includes the first wall portion 211.

[0261] The shell 214 includes an integrally formed side wall and a bottom wall, that is, the shell 214 is manufactured by an integral molding process, such as an integral molding process such as stamping, casting or extrusion molding, that is, the side wall and the bottom wall of the shell 214 are an integral structure.

[0262] The housing 214 includes a first wall portion 211, that is, the first wall portion 211 is a wall of the housing 214. Fig. 9 In the embodiment, the first wall portion 211 is a bottom wall of the housing 214 disposed opposite to the end cover 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.

[0263] 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 be 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.

[0264] 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. The shell 214 has a housing cavity formed inside, which is used to accommodate the electrode assembly 22. The shell 214 has second openings 2141 formed at both ends of the first wall portion 211 in the thickness direction, and the two second openings 2141 are connected to the housing 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.

[0265] The shell 214 of the outer shell 21 is provided with second openings 2141 at both ends of the first wall portion 211 in the thickness direction, 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.

[0266] When the end cover 213 is the first wall portion 211, the pressure relief component 212 is disposed on the end cover 213, which is simple and convenient to manufacture. When the housing 214 includes the first wall portion 211, the pressure relief component 212 is disposed on a wall of the housing 214, and the fluid medium ejected by the pressure relief component 212 is not likely to act on other electrical connection structures on the end cover 213, which is conducive to reducing the risk of short circuit of the battery cell 20.

[0267] In some embodiments, the avoidance portion 32 is a through hole or a groove disposed on the support member 30 .

[0268] When the escape 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 escape portion 32 is a groove provided in the support member 30 , the groove is recessed from the support surface 31 in a direction away from the battery cell 20 .

[0269] In the embodiment where the avoidance portion 32 is a groove disposed on 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.

[0270] 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.

[0271] Please refer to Figure 3 and Figure 4 In some embodiments, the avoidance portion 32 corresponds to the pressure relief component 212 one by one.

[0272] Each pressure relief component 212 of each battery cell 20 has a corresponding avoidance portion 32. The avoidance portion 32 and the pressure relief component 212 are in a one-to-one relationship.

[0273] By making the avoidance portion 32 correspond to the pressure relief component 212 one by one, each pressure relief component 212 can have an avoidance effect, so that each battery cell 20 can release pressure smoothly, which is beneficial to improving the reliability of the battery 100. In addition, since the avoidance portion 32 corresponds to the pressure relief component 212 one by one, a single avoidance portion 32 can be set smaller, and the structure left between two adjacent avoidance portions 32 can be regarded as a reinforcing rib, so that the support member 30 has a higher strength.

[0274] Please refer to Fig.10 and Fig.11 , Fig.10 Schematic diagram of the structure of the battery cell 20 and the support member 30 provided in some other embodiments of the present application. Fig.11 The cross-sectional view of the battery cell 20 and the support member 30 provided in some other embodiments of the present application. In some other embodiments, at least one avoidance portion 32 is provided corresponding to the pressure relief components 212 of the plurality of battery cells 20 .

[0275] 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.

[0276] One escape portion 32 can be set corresponding to the pressure relief components 212 of multiple battery cells 20, and the structure left between two adjacent escape portions 32 can be regarded as a reinforcing rib, so that the support member 30 has a higher strength. In addition, a single escape portion 32 can be set larger to absorb assembly tolerances and reduce assembly requirements.

[0277] Please refer to Fig.10 and Fig.11 In some embodiments, the battery 100 includes a plurality of 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 one row of battery cells 20 .

[0278] 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.

[0279] The battery 100 includes multiple rows of battery cells 20, and 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.

[0280] Please refer to Fig.12 and Fig.13 , Fig.12 Schematic diagram of the structure of the battery cell 20 and the support member 30 provided in some other embodiments of the present application. Fig.13 The cross-sectional view of the battery cell 20 and the support member 30 provided in some other embodiments of the present application. In some other embodiments, the battery 100 includes multiple rows of battery cells 20, and one avoidance portion 32 is disposed corresponding to the pressure relief component 212 of one row of battery cells 20.

[0281] 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 .

[0282] 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 components 212 of one row of battery cells 20. This is conducive to absorbing assembly tolerances and reducing assembly requirements.

[0283] Please refer to Fig.14 , Fig.14 The cross-sectional view of the battery cell 20 and the support member 30 provided in some other embodiments of the present application. In some other embodiments, the support member 30 is connected to the first wall portion 211 through an adhesive layer 40 .

[0284] “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.

[0285] The support member 30 is bonded and fixed to the wall, so that the battery cell 20 can 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 the assembly difficulty and cost are low.

[0286] Please refer to Fig.14 In some embodiments, the avoidance portion 32 is formed with a first opening 321 on the support surface 31 , and there is a gap between the adhesive layer 40 and the edge of the first opening 321 .

[0287] Along the thickness direction of the first wall portion 211 , the projection of the adhesive layer 40 on the support surface 31 is located outside the edge of the first opening 321 .

[0288] By providing a gap between the adhesive layer 40 and the edge of the first opening 321, the adhesive layer 40 is disposed 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.

[0289] Please refer to Fig.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.

[0290] The support member 30 separates the electrical cavity 50 and the exhaust cavity 60 in the box body 10, and the electrical cavity 50 and the exhaust cavity 60 are respectively located on both sides of the support member 30 along the thickness direction of the first wall portion 211. The battery cell 20 is accommodated in the electrical cavity 50, and the exhaust cavity 60 is used to guide the air flow when the battery cell 20 is depressurized, so that the battery cell 20 can be depressurized smoothly.

[0291] An electrical cavity 50 is provided to accommodate the battery cell 20, and an exhaust cavity 60 is provided to discharge the fluid medium. The electrical cavity 50 and the exhaust cavity 60 are respectively provided on both sides of the support member 30, so that the discharged fluid medium is not easy to act on the battery cell 20 in the electrical cavity 50, and is not easy to cause a short circuit in the battery cell 20, which is beneficial to improving the reliability of the battery 100.

[0292] In some embodiments, the support member 30 is configured to enable thermal management of the battery cells 20 .

[0293] The support member 30 may be a heat management component. For example, the support member 30 is a water-cooling plate, and the water-cooling plate supports the first wall portion 211 of the battery cell 20 .

[0294] 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 exert its performance. The support member 30 can perform multiple functions in one component, which is beneficial for simplifying the structure of the battery 100.

[0295] Please refer to Fig.14 In some embodiments, the minimum thickness of the support member 30 except the avoidance portion 32 is greater than the maximum thickness of the first wall portion 211 .

[0296] Please refer to Fig.14 The minimum thickness of the support member 30 except the avoidance portion 32 is C, and the maximum thickness of the first wall portion 211 is D, satisfying: C>D.

[0297] 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 has a greater thickness and sufficient strength to stably support the battery cell 20 .

[0298] The embodiment of the present application further provides an electric device, which includes the battery 100 described above.

[0299] According to some embodiments of this application, please refer to Figure 3 to Figure 14 .

[0300] The embodiment of the present application provides a battery cell 20, which includes a 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 arranged on the first wall portion 211. The pressure relief component 212 includes a first groove 2121, and the pressure relief component 212 is configured to be able to split along the first groove 2121 when the battery cell 20 is depressurized. The support member 30 supports the first wall portion 211, and the support member 30 has a support surface 31 facing the first wall portion 211, and the support surface 31 is provided with an avoidance portion 32. Along the thickness direction of the first wall portion 211, the projection of the first groove 2121 is located in the avoidance portion 32. The pressure relief component 212 is arranged on the first wall portion 211 of the battery cell 20, and when the battery cell 20 is depressurized, the pressure relief component 212 can be split 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 be 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 outer side 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.

[0301] The avoidance portion 32 is formed with a first opening 321 on the support surface 31, and 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 A, which satisfies: 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, in the direction perpendicular to the thickness direction of the first wall portion 211, the first groove 2121 is farther from the edge of the first opening 321, 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 outer side of the first groove 2121, and the deformation of the pressure relief component 212 is less likely to be suppressed, and the cracking of the first groove 2121 is less likely to be suppressed, so that the first groove 2121 can be cracked in time when the battery cell 20 is depressurized, which is conducive to improving the timeliness of the pressure relief of the battery cell 20 and the reliability of the battery 100. In addition, by making 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 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.

[0302] The first wall portion 211 is a rectangular structure. 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 A1, and 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 A2, which satisfies: A=A2, A2<A1. 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. 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 rigidity of the pressure relief component 212 in the width direction of the first wall portion 211 changes slightly, while the rigidity 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 in the middle position in the length direction of the first wall portion 211 changes significantly compared with 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 in the middle position in the width direction of the first wall portion 211 changes slightly compared with 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 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 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, and allows 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 the reliability of the battery 100.

[0303] A1≥5mm. 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 5mm, the first groove 2121 is farther away from the edge of the first opening 321 in the length direction of the first wall portion 211, 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 outer side of the first groove 2121, and the deformation of the pressure relief component 212 is less likely to be suppressed, and the cracking of the first groove 2121 is less likely to be suppressed, 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 the reliability of the battery 100. In addition, by making 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 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.

[0304] The first groove 2121 defines a predetermined pressure relief area 21211. The pressure relief component 212 includes a second groove 2124, and the second groove 2124 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. Among them, along 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, so that the predetermined pressure relief area 21211 is more easily flipped open under the action of the fluid medium, which can not only increase the probability of the predetermined pressure relief area 21211 opening, but also increase 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 providing 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. Therefore, 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 the reliability of the battery 100.

[0305] The avoidance portion 32 is formed with a first opening 321 on the support surface 31, 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 edge of the first opening 321 is B, which satisfies: 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, in the direction perpendicular to the thickness direction of the first wall portion 211, the second groove 2124 is farther from the edge of the first opening 321, and the avoidance portion 32 has a better avoidance effect on the second groove 2124. When the battery cell 20 is depressurized, the support member 30 is less likely to abut against the predetermined pressure relief area 21211, and is less likely to inhibit the predetermined pressure relief area 21211 from turning over, so that the predetermined pressure relief area 21211 can be turned over and opened in time when the battery cell 20 is depressurized, which is conducive to improving the timeliness of the pressure relief of the battery cell 20 and the reliability of the battery 100. In addition, by making 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 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.

[0306] In some embodiments, the avoidance portion 32 corresponds to the pressure relief component 212 one by one. By making the avoidance portion 32 correspond to the pressure relief component 212 one by one, each pressure relief component 212 can have an avoidance effect, so that each battery cell 20 can release pressure smoothly, which is beneficial to improving the reliability of the battery 100. In addition, since the avoidance portion 32 corresponds to the pressure relief component 212 one by one, a single avoidance portion 32 can be set smaller, and the structure left between two adjacent avoidance portions 32 can be regarded as a reinforcing rib, so that the support member 30 has a higher strength.

[0307] In other embodiments, at least one avoidance portion 32 is provided corresponding to the pressure relief components 212 of multiple battery cells 20. One avoidance portion 32 can be provided corresponding to the pressure relief components 212 of multiple battery cells 20, and the structure remaining between two adjacent avoidance portions 32 can be regarded as a reinforcing rib, so that the support member 30 has a higher strength. In addition, a single avoidance portion 32 can be provided larger, which can absorb assembly tolerance and reduce assembly requirements.

[0308] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery, characterized in that: 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 split along the first groove when the battery cell is depressurized; A support member supports the first wall portion, wherein 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, characterized in that: The avoidance portion forms a first opening on the support surface, and a minimum distance 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 is A, satisfying: A≥3mm.

3. The battery according to claim 2, characterized in that: 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 supporting 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 supporting 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, characterized in that: A1≥5mm.

5. The battery according to claim 3, characterized in that: The difference between A1 and A2 is less than 10mm.

6. The battery according to any one of claims 1 to 5, characterized in that: The first groove defines a predetermined pressure relief area, and the pressure relief component includes a second groove, and the second groove 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.

7. The battery according to claim 6, characterized in that: The avoidance portion forms a first opening on the support surface, and a minimum distance 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 is B, satisfying: B≥3mm.

8. The battery according to claim 7, characterized in that: 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, characterized in that: 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, characterized in that: 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 claim 8, characterized in that: The second grooves are arranged on both sides of the first groove along the width direction of the first wall portion.

12. The battery according to claim 6, characterized in that: 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 disposed on the first surface, and the second groove is disposed on the second surface.

13. The battery according to claim 12, characterized in that: 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 claim 6, characterized in that: 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.

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

16. The battery according to claim 15, characterized in that: 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 claim 14, characterized in that: 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 claim 14, characterized in that: 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, characterized in that: 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 arranged at intervals from the second groove.

20. The battery according to claim 19, characterized in that: 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 5, characterized in that: 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 from the first surface to the second surface, and in two adjacent grooves, a first-level groove away from the first surface is arranged on the groove bottom surface of the first-level groove close to the first surface.

22. The battery according to any one of claims 1 to 5, characterized in that: The battery cell includes an electrode terminal, and the electrode terminal is provided on a wall of the housing other than the first wall portion.

23. The battery according to claim 22, characterized in that: 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 5, characterized in that: The housing comprises: a housing having a second opening; an end cover connected to the housing and closing the second opening; Wherein, the end cover is the first wall portion, or the shell includes the first wall portion.

25. The battery according to any one of claims 1 to 5, characterized in that: The avoidance portion is a through hole or a groove arranged on the support member.

26. The battery according to any one of claims 1 to 5, characterized in that: The avoidance portions correspond to the pressure relief components one by one.

27. The battery according to any one of claims 1 to 5, characterized in that: At least one of the avoidance portions is disposed correspondingly to the pressure relief components of the plurality of battery cells.

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

29. The battery according to claim 27, characterized in that: The battery comprises a plurality of rows of battery cells, and one avoidance portion is arranged corresponding to a pressure relief component of a row of battery cells.

30. The battery according to any one of claims 1 to 5, characterized in that: The support member is connected to the first wall portion via an adhesive layer.

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

32. The battery according to any one of claims 1 to 5, characterized in that: The battery includes an electrical cavity and an exhaust cavity, which are located on both sides of the support member along the thickness direction of the first wall portion. The electrical cavity is used to accommodate a battery cell, and the exhaust cavity is used to guide gas flow when the battery cell is depressurized.

33. The battery according to any one of claims 1 to 5, characterized in that: The support member is configured to enable thermal management of the battery cell.

34. The battery according to any one of claims 1 to 5, characterized in that: 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, characterized in that: Comprising a battery according to any one of claims 1-34.

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