Battery monomer, battery and electric device

Abstract

The embodiment of the invention provides a battery monomer, a battery and an electric device. The reliability of the battery monomer can be improved. The battery cell includes: a housing having a first wall; the pressure relief mechanism is arranged on the first wall; an electrode assembly, wherein the electrode assembly is accommodated in the shell; and the supporting component is arranged opposite to the pressure relief mechanism and is used for limiting the electrode assembly to move towards the first wall.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. In this case, electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] With the development of battery technology, various battery performances are constantly improving. During the use of batteries, the reliability of the battery cells in exerting their electrical performance is an important factor in measuring the quality of the battery. Therefore, how to improve the reliability of battery cells is still a problem that needs to be solved. Summary of the invention

[0004] The embodiments of the present application provide a battery cell, a battery, and an electrical device, which can improve the reliability of the battery cell.

[0005] In a first aspect, a battery cell is provided, comprising: a housing having a first wall;

[0006] a pressure relief mechanism, the pressure relief mechanism being arranged on the first wall; an electrode assembly, the electrode assembly being accommodated in the shell; and a supporting member, the supporting member being arranged opposite to the pressure relief mechanism and being used to limit the movement of the electrode assembly toward the first wall.

[0007] The support member is arranged relative to the pressure relief mechanism, and can limit the movement of the pressure relief mechanism when the electrode assembly moves toward the pressure relief mechanism, so that the electrode assembly is not easy to block the pressure relief mechanism, which is beneficial for the pressure relief mechanism to be actuated under the action of high-temperature and high-pressure substances inside the battery cell to quickly discharge the temperature or pressure inside the battery cell, thereby improving the reliability of the battery cell.

[0008] In some embodiments, an exhaust passage connecting the pressure relief mechanism and the electrode assembly is provided between the support member and the pressure relief mechanism.

[0009] In the embodiment of the present application, the discharge channel is conducive to guiding the high-temperature and high-pressure substances to move toward the pressure relief mechanism, so that the pressure relief mechanism can be actuated to quickly discharge the high-temperature and high-pressure substances inside the battery cell. At the same time, the support member can be used to form the discharge channel, limit the deformation of the discharge channel, reduce the possibility of the electrode assembly blocking the discharge channel, keep the discharge channel unobstructed to a certain extent, and improve the reliability of the battery cell.

[0010] In some embodiments, the battery cell includes an insulating member disposed between the electrode assembly and the first wall, and the supporting member is connected to the insulating member.

[0011] In the embodiment of the present application, the insulating member can play an insulating role to insulate the electrode assembly from the first wall. The connection between the support member and the insulating member can also reduce the possibility that the support member connects the electrode assembly to the first wall.

[0012] In some embodiments, the support member is disposed between the first wall and the insulating member.

[0013] In the normal use state of the battery cell, the support member is arranged between the first wall and the insulating member to reduce the possibility of contact between the electrode assembly and the support member. At the same time, the insulating member is conducive to isolating the support member from at least part of the electrode assembly, thereby improving the insulation performance between the support member and the electrode assembly.

[0014] In some embodiments, the support member is connected to a surface of the insulating member facing the first wall.

[0015] The portion where the support member is connected to the insulating member can be insulated from the electrode assembly by the insulating member. At the same time, the portion where the support member is connected to the insulating member is located between the insulating member and the first wall, which can reduce the possibility of the support member being dislocated when squeezed by the electrode assembly and strengthen the protection of the support member to the pressure relief mechanism.

[0016] In some embodiments, the insulating member includes a first through hole, the first through hole is arranged opposite to the pressure relief mechanism in the thickness direction of the first wall, and at least a portion of the supporting member is accommodated in the first through hole.

[0017] In the embodiment of the present application, the high-temperature and high-pressure gas inside the battery cell can quickly reach the area where the pressure relief mechanism is located through the first through hole, which is conducive to the actuation of the pressure relief mechanism to quickly release the temperature or pressure inside the battery cell. At least part of the support member is accommodated in the first through hole, which also allows a certain gap between the support member and the pressure relief mechanism, while limiting the movement of the electrode assembly toward the first wall, it can also keep the discharge channel unobstructed.

[0018] In some embodiments, a surface of the support member facing the electrode assembly is provided with an insulating layer.

[0019] The insulating layer can improve the insulation performance between the support member and the electrode assembly. Even when the electrode assembly is in contact with the support member, the electric energy generated in the electrode assembly is not easily conducted to the first wall, thereby improving the reliability of the battery cell.

[0020] In some embodiments, a second groove is disposed on a surface of the insulating member facing the first wall, and an accommodation space is formed between the second groove and the first wall, and the supporting member is accommodated in the accommodation space.

[0021] The convex structure formed by the second groove on the side of the insulating member facing the electrode assembly can protect the support member, so that the support member is not likely to fall into the area where the electrode assembly is located. At the same time, the convex structure can play an insulating role between the support member and the electrode assembly, reducing the possibility of the support member conducting the electrode assembly with the first wall.

[0022] In some embodiments, the second groove has an opening in the length direction of the first wall and / or the width direction of the first wall, and the opening is used to connect the pressure relief mechanism with the electrode assembly.

[0023] The opening of the second groove in the length direction of the first wall and / or the width direction of the first wall is conducive to guiding the high-temperature and high-pressure materials inside the battery cell to be discharged quickly toward the pressure relief mechanism, so as to quickly release the temperature or pressure inside the battery cell, thereby improving the reliability of the battery cell.

[0024] In some embodiments, in the thickness direction of the first wall, a projection of the bottom wall of the second groove covers a projection of the supporting member.

[0025] The projection of the bottom wall of the second groove covers the projection of the support member, so that the electrode assembly is not easy to directly contact the support member when moving toward the first wall, thereby strengthening the insulation between the support member and the electrode assembly and improving the reliability of the battery cell.

[0026] In some embodiments, the support member includes a connected support wall and at least one connecting portion, the support wall is used to limit the movement of the electrode assembly toward the first wall, and the connecting portion is used to connect the insulating member and the support wall.

[0027] The support member is connected to the insulating member through the connecting part so that a certain gap can be provided between the support member and the pressure relief structure. The support member can still reserve at least part of the discharge channel for the pressure relief mechanism while restricting the movement of the electrode assembly, so that the high-temperature and high-pressure materials inside the battery cell can reach the pressure relief mechanism through the discharge channel.

[0028] In some embodiments, the connecting portion is snap-fitted to the insulating member.

[0029] The connection between the connecting portion and the insulating member through the snap connection can easily fix the supporting member and the insulating member, and at the same time can enhance the fixing strength between the two, so that the supporting member is not easy to fall off from the insulating member.

[0030] In some embodiments, the insulating member is provided with a first groove, the opening direction of the first groove is perpendicular to the thickness direction of the first wall, and at least a part of the connecting portion is accommodated in the first groove.

[0031] The first groove can limit the movement of the connecting portion, thereby achieving a fixed connection between the supporting member and the insulating member, and can also improve the connection strength between the supporting member and the insulating member, so that the supporting member is not likely to fall off from the insulating member.

[0032] In some embodiments, a first protrusion is disposed on a surface of the insulating member, and the first groove is disposed in the first protrusion.

[0033] Providing the first protrusion on the surface of the insulating member and providing the first groove in the first protrusion can improve the strength of the insulating member and improve the limiting effect between the insulating member and the support member. At the same time, the corresponding thickening of the connecting portion can also improve the strength of the support member, so that the support member is not easily damaged when being squeezed by the electrode assembly, thereby being able to limit the movement of the electrode assembly.

[0034] In some embodiments, a portion of the connecting portion accommodated in the first groove is provided with a first step structure, the first groove has a second step structure, and the first step structure cooperates with the second step structure.

[0035] During the assembly process, the narrower part of the first step structure first passes through the wider part of the second step structure, and then extends into the narrower part of the second step structure. The cooperation between the first step structure and the second step structure is conducive to guiding the connecting wall to be accommodated in the first groove, thereby reducing the positioning accuracy during the assembly process.

[0036] In some embodiments, the connection portion is connected to a surface of the insulating member facing the first wall.

[0037] The connection between the connecting portion and the surface of the insulating component facing the first wall can make the supporting component fixed by both the first wall and the insulating component at the same time, and it is not easy to be dislocated when squeezed by the electrode assembly, and can play a certain protective role for the pressure relief mechanism at a position opposite to the pressure relief mechanism.

[0038] In some embodiments, the connection portion is connected to a surface of the insulating member facing the electrode assembly.

[0039] The support wall can limit the deformation of the electrode assembly, making it difficult for the electrode assembly to move further toward the pressure relief mechanism. The connecting portion can connect the support wall to the insulating component, so that the support component can limit the deformation of the electrode assembly at a fixed position, so that a certain gap can be maintained between the electrode assembly and the pressure relief mechanism, thereby keeping the discharge channel unobstructed.

[0040] In some embodiments, the connection portion includes at least one first connection wall parallel to a thickness direction of the first wall, and the first connection wall is used to form a gap between the insulating member and the support wall.

[0041] The gap between the first connecting wall and the first wall can maintain a certain discharge channel around the pressure relief mechanism, so that high-temperature and high-pressure substances can reach the pressure relief mechanism along the discharge channel, thereby actuating the pressure relief mechanism to discharge high-temperature and high-pressure substances inside the battery cell.

[0042] In some embodiments, the connecting portion includes a second connecting wall connecting the first connecting wall and the insulating member.

[0043] The second connecting wall can increase the connection area between the supporting member and the insulating member, which is beneficial to improving the connection strength between the supporting member and the insulating member, so that the supporting member is not easily deformed or falls off the insulating member when squeezed by the electrode assembly, and can effectively limit the movement of the electrode assembly.

[0044] In some embodiments, at least one of the first connecting walls includes two first connecting walls, and the two first connecting walls are arranged opposite to each other at edges of the supporting wall.

[0045] The first connecting walls arranged opposite to each other can make the connection between the supporting member and the insulating member more stable, and are not easily deformed in the process of restricting the movement of the electrode assembly, which is beneficial to better restrict the movement of the electrode assembly.

[0046] In some embodiments, the first connecting wall has a through hole, and the through hole is used to connect the pressure relief mechanism and the electrode assembly.

[0047] The through hole can increase the discharge channel and discharge path inside the battery cell, which is conducive to guiding the high-temperature and high-pressure materials inside the battery cell to flow in the direction of the pressure relief mechanism, so that the pressure relief mechanism can be actuated to quickly discharge the high-temperature and high-pressure materials, reducing the possibility of more serious explosion accidents, thereby improving the reliability of the battery cell.

[0048] In some embodiments, a projection of the support wall in the thickness direction of the first wall covers a projection of the pressure relief mechanism in the thickness direction of the first wall.

[0049] The support member can protect the pressure relief mechanism over a larger range, so that when the electrode assembly moves toward the first wall, on the one hand, it will be restricted by the support member, and on the other hand, it is difficult to move directly to the pressure relief mechanism and block the pressure relief mechanism, thereby maintaining the unobstructed discharge channel inside the battery cell and improving the reliability of the battery cell.

[0050] In some embodiments, the support member is connected to a surface of the first wall facing the electrode assembly in a thickness direction of the first wall.

[0051] The connection between the support member and the first wall can more directly protect the pressure relief mechanism, reduce the possibility of the electrode assembly blocking the pressure relief mechanism when moving toward the first wall, and help improve the reliability of the battery cell.

[0052] In some embodiments, the support member includes a connected support wall and at least one connecting portion, the support wall is used to limit the movement of the electrode assembly toward the first wall, and the connecting portion is used to connect the first wall and the support wall.

[0053] The connecting portion in the support member can realize the connection between the first wall and the support member, and the support wall can limit the movement of the electrode assembly while maintaining the patency of the internal discharge channel of the battery cell, so that the pressure relief mechanism can be actuated under the action of high temperature and high pressure substances inside the battery cell.

[0054] In some embodiments, the connecting portion includes at least one first connecting wall parallel to a thickness direction of the first wall, and the first connecting wall is used to form a gap between the first wall and the supporting wall.

[0055] The gap between the first connecting wall and the first wall can maintain a certain discharge channel around the pressure relief mechanism, so that high-temperature and high-pressure substances can reach the pressure relief mechanism along the discharge channel, thereby actuating the pressure relief mechanism to discharge high-temperature and high-pressure substances inside the battery cell.

[0056] In some embodiments, the connecting portion includes a second connecting wall connecting the first connecting wall and the first wall.

[0057] The second connecting wall can increase the connection area between the support member and the insulating member, which is beneficial to improving the connection strength between the support member and the first wall, so that the support member is not easily deformed or falls off the insulating member when squeezed by the electrode assembly, and can effectively limit the movement of the electrode assembly.

[0058] In some embodiments, at least one of the first connecting walls includes two first connecting walls, and the two first connecting walls are arranged opposite to each other at edges of the supporting wall.

[0059] The first connecting walls arranged opposite to each other can make the connection between the supporting member and the first wall more stable, and are not easily deformed in the process of restricting the movement of the electrode assembly, which is beneficial to better restrict the movement of the electrode assembly.

[0060] In some embodiments, the first connecting wall has a through hole, and the through hole is used to connect the pressure relief mechanism and the electrode assembly.

[0061] The through hole can increase the discharge channel and discharge path inside the battery cell, which is conducive to guiding the high-temperature and high-pressure materials inside the battery cell to flow in the direction of the pressure relief mechanism, so that the pressure relief mechanism can be actuated to quickly discharge the high-temperature and high-pressure materials, reducing the possibility of more serious explosion accidents, thereby improving the reliability of the battery cell.

[0062] In some embodiments, a projection of the support wall in the thickness direction of the first wall covers a projection of the pressure relief mechanism in the thickness direction of the first wall.

[0063] The support member can protect the pressure relief mechanism over a larger range, so that when the electrode assembly moves toward the first wall, on the one hand, it will be restricted by the support member, and on the other hand, it is difficult to move directly to the pressure relief mechanism and block the pressure relief mechanism, thereby maintaining the unobstructed discharge channel inside the battery cell and improving the reliability of the battery cell.

[0064] In some embodiments, the battery cell includes an insulating member disposed between the electrode assembly and the first wall.

[0065] The insulating component can play an insulating role, insulating the electrode assembly from the first wall, and reducing the possibility of conduction between the electrode assembly and the first wall.

[0066] In some embodiments, the insulating member includes a first through hole, the first through hole is arranged opposite to the pressure relief mechanism in the thickness direction of the first wall, and at least a portion of the supporting member is accommodated in the first through hole.

[0067] In the embodiment of the present application, the high-temperature and high-pressure gas inside the battery cell can quickly reach the area where the pressure relief mechanism is located through the first through hole, which is conducive to the actuation of the pressure relief mechanism to quickly release the temperature or pressure inside the battery cell. At least part of the support member is accommodated in the first through hole, which also allows a certain gap between the support member and the pressure relief mechanism, while limiting the movement of the electrode assembly toward the first wall, it can also keep the discharge channel unobstructed.

[0068] In some embodiments, a surface of the support member facing the electrode assembly is provided with an insulating layer.

[0069] The insulating layer can improve the insulation performance between the support member and the electrode assembly. Even when the electrode assembly is in contact with the support member, the electric energy generated in the electrode assembly is not easily conducted to the first wall, thereby improving the reliability of the battery cell.

[0070] In some embodiments, a second groove is disposed on a surface of the insulating member facing the first wall, and an accommodation space is formed between the second groove and the first wall, and the supporting member is accommodated in the accommodation space.

[0071] The convex structure formed by the second groove on the side of the insulating member facing the electrode assembly can protect the support member, so that the support member is not likely to fall into the area where the electrode assembly is located. At the same time, the convex structure can play an insulating role between the support member and the electrode assembly, reducing the possibility of the support member conducting the electrode assembly with the first wall.

[0072] In some embodiments, the second groove has an opening in the length direction of the first wall and / or the width direction of the first wall, and the opening is used to connect the pressure relief mechanism with the electrode assembly.

[0073] The opening of the second groove in the length direction of the first wall and / or the width direction of the first wall is conducive to guiding the high-temperature and high-pressure materials inside the battery cell to be discharged quickly toward the pressure relief mechanism, so as to quickly release the temperature or pressure inside the battery cell, thereby improving the reliability of the battery cell.

[0074] In some embodiments, in the thickness direction of the first wall, a projection of the bottom wall of the second groove covers a projection of the supporting member.

[0075] The projection of the bottom wall of the second groove covers the projection of the support member, so that the electrode assembly is not easy to directly contact the support member when moving toward the first wall, thereby strengthening the insulation between the support member and the electrode assembly and improving the reliability of the battery cell.

[0076] In some embodiments, the melting point of the support member is higher than the melting point of the insulating member.

[0077] In the same temperature environment, the supporting member is less likely to melt or dissolve than the insulating member, and can maintain its original shape and position inside the battery cell, thereby limiting the electrode assembly moving toward the pressure relief mechanism, making it difficult for the electrode assembly to move to a position that blocks the discharge channel, thereby limiting the deformation of the discharge channel and providing a discharge channel for high-temperature and high-pressure materials to reach the pressure relief mechanism, which is beneficial to improving the reliability of the battery cell.

[0078] In some embodiments, the melting point of the support member is greater than 100°C.

[0079] In the embodiment of the present application, a support member with a melting point greater than 100°C is used. This is beneficial in that it is not easily melted when thermal runaway occurs in the battery cell, and an exhaust channel connected to the pressure relief mechanism can be formed between the first wall and the electrode assembly, so that the thermal runaway gas can be discharged to the outside of the battery cell through the pressure relief mechanism in a timely manner, which is beneficial to improving the reliability of the battery cell.

[0080] In a second aspect, a battery is provided, comprising the battery cell described in any embodiment of the first aspect.

[0081] In a third aspect, an electrical device is provided, comprising the battery described in any embodiment of the second aspect, wherein the battery is used to provide electrical energy to the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0082] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

[0083] Figure 1 It is a structural schematic diagram of a vehicle provided in an embodiment of the present application.

[0084] Figure 2 It is a schematic diagram of the structure of a battery provided in an embodiment of the present application.

[0085] Figure 3 It is a schematic diagram of the structure of a battery cell provided in an embodiment of the present application.

[0086] Figure 4 It is a schematic diagram of the structure of another battery cell provided in an embodiment of the present application.

[0087] Figure 5 It is a structural schematic diagram of an insulating component and a supporting component provided in an embodiment of the present application, which are located on one side of the first wall in the thickness direction of the first wall.

[0088] Figure 6 yes Figure 5 Schematic diagram of the structure of the side facing the electrode assembly in the thickness direction of the first wall.

[0089] Figure 7 yes Figure 5 Cross-section of the structure in the AA direction.

[0090] Figure 8 It is a schematic structural diagram of another insulating member and a supporting member provided in an embodiment of the present application, on one side of the first wall in the thickness direction of the electrode assembly.

[0091] Fig. 9 yes Figure 8 Schematic diagram of the enlarged structure of the M part.

[0092] Fig.10 yes Figure 8 Cross-section of the structure along the BB direction.

[0093] Fig.11 It is a structural schematic diagram of a supporting component provided in an embodiment of the present application.

[0094] Fig.12 It is a schematic structural diagram of another insulating member and a supporting member provided in an embodiment of the present application, on one side of the first wall in the thickness direction of the electrode assembly.

[0095] Fig.13 yes Fig.12 Cross-section of the structure along the CC direction.

[0096] Fig.14 yes Fig.13 Schematic diagram of the enlarged structure of part N.

[0097] In the drawings, the drawings are not drawn to scale. DETAILED DESCRIPTION

[0098] The following detailed description and drawings of the embodiments of the present application are used to illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0099] In the description of the present application, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly perpendicular, but within the tolerance range. "Parallel" is not strictly parallel, but within the tolerance range. All technical and scientific terms used in the present application have the same meaning as those generally understood by technicians in the technical field of the present application; the terms used in the present application and in the specification of the application are only for the purpose of describing specific embodiments, and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0100] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0101] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations 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. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0102] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists, A and B exist, and B exists. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0103] The term "multiple" as used in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple sheets" refers to more than two sheets (including two sheets).

[0104] 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.

[0105] In the present application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, lithium metal batteries or magnesium-ion batteries, etc., and the embodiments of the present application do not limit this. Battery cells may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, and the embodiments of the present application do not limit this.

[0106] 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. For example, the battery mentioned in the present application may include a battery module or a battery pack. The battery generally includes a box for encapsulating one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0107] The battery cell includes an electrode assembly and an electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The positive electrode collector not coated with the positive electrode active material layer serves as the positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide. The negative electrode sheet includes a negative electrode collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode collector. The negative electrode collector not coated with the negative electrode active material layer protrudes from the negative electrode collector coated with the negative electrode active material layer. The negative electrode collector not coated with the negative electrode active material layer serves as the negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, lithium metal or lithium alloy, etc. In order to ensure that a large current passes without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. The material of the isolation film may be polypropylene (PP) or polyethylene (PE), etc. In addition, the electrode assembly in the embodiment of the present application includes but is not limited to a winding structure or a laminated structure.

[0108] During the use of battery cells, the battery cells may produce a large amount of high-temperature and high-pressure substances such as thermal runaway gases due to mechanical external forces or internal chemical reactions. These high-temperature and high-pressure substances need to reach the pressure relief structure through the discharge channel formed by the through holes set on the electrode assembly and other structures inside the battery cell, and the pressure relief mechanism is actuated by high temperature or high pressure to discharge the high-temperature and high-pressure substances inside the battery cell. However, as the energy density of battery cells continues to increase, the thermal runaway rate of battery cells continues to increase, and the gas production rate and gas production volume are significantly increased. When the gas production rate and gas production volume are large enough, the electrode assembly may move towards the direction of the pressure relief mechanism driven by the high-temperature and high-pressure substances, blocking the pressure relief mechanism, causing the pressure relief mechanism to be unable to actuate normally, and thus unable to quickly discharge the high-temperature and high-pressure substances. In this case, the battery cell is prone to cracking, and the reliability of the battery cell is greatly reduced.

[0109] In view of this, an embodiment of the present application provides a battery cell, in which a support member is provided, and the support member is arranged opposite to the pressure relief mechanism. Even if the electrode assembly moves toward the pressure relief mechanism under the drive of high-temperature and high-pressure substances, the support member can limit the movement of the electrode assembly toward the pressure relief mechanism, reduce the distance that the electrode assembly moves toward the pressure relief mechanism, and make it difficult for the electrode assembly to move to a position that blocks the pressure relief mechanism, thereby maintaining the patency of the discharge channel, which is beneficial to increasing the discharge speed of the high-temperature and high-pressure substances inside the battery cell and improving the reliability of the battery cell.

[0110] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using batteries. Electrical devices may be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and electric tools, etc. Vehicles may be fuel vehicles, gas vehicles, or new energy vehicles, and new energy vehicles may be pure electric vehicles, hybrid vehicles, or extended-range vehicles, etc.; spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The embodiments of the present application include but are not limited to the above-mentioned electrical devices.

[0111] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0112] like Figure 1 As shown, it is a structural schematic diagram of a vehicle 1 according to an embodiment of the present application. The vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A motor 90, a controller 80 and a battery 10 may be arranged inside the vehicle 1. The controller 80 is used to control the battery 10 to supply power to the motor 90. For example, a battery 10 may be arranged at the bottom, front or rear of the vehicle 1. The battery 10 may be used to supply power to the vehicle 1. For example, the battery 10 may be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, for the working power requirements during the start-up, navigation and operation of the vehicle 1. In another embodiment of the present application, the battery 10 may not only be used as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0113] In order to meet different power requirements, the battery may include multiple battery cells, wherein the multiple battery cells may be connected in series, in parallel, or in a hybrid connection, wherein the hybrid connection refers to a mixture of series and parallel connections. The battery may also be referred to as a battery pack. Optionally, multiple battery cells may be connected in series, in parallel, or in a hybrid connection to form a battery module, and multiple battery modules may be connected in series, in parallel, or in a hybrid connection to form a battery. In other words, multiple battery cells may be directly connected to form a battery, or may be first connected to form a battery module, and then the battery module may be connected to form a battery.

[0114] For example, Figure 2 The schematic diagram of the structure of a battery 10 according to an embodiment of the present application is shown. The battery 10 may include at least one battery module 200. The battery module 200 includes a plurality of battery cells 20. The battery 10 may also include a box 11, the inside of the box 11 is a hollow structure, and the plurality of battery cells 20 are accommodated in the box 11. Figure 2 A possible implementation of the box 11 of the embodiment of the present application is shown, such as Figure 2 As shown, the box body 11 may include two parts, which are respectively referred to as a first part 111 and a second part 112, and the first part 111 and the second part 112 are buckled together. The shapes of the first part 111 and the second part 112 may be determined according to the shape of the battery module 200 combination, and at least one of the first part 111 and the second part 112 has an opening. For example, Figure 2 As shown, the first part 111 and the second part 112 can both be hollow rectangular parallelepipeds and each has only one open face, the opening of the first part 111 and the opening of the second part 112 are arranged opposite to each other, and the first part 111 and the second part 112 are interlocked to form a box body 11 with a closed chamber.

[0115] For example, different from Figure 2 As shown, only one of the first part 111 and the second part 112 may be a hollow cuboid with an opening, while the other may be in the shape of a plate to cover the opening. For example, here, the second part 112 is a hollow cuboid with only one face as an opening face, and the first part 111 is in the shape of a plate. Then, the first part 111 covers the opening of the second part 112 to form a box 11 with a closed chamber, which can be used to accommodate multiple battery cells 20. Multiple battery cells 20 are connected in parallel, in series, or in a mixed combination and placed in the box 11 formed by the first part 111 and the second part 112 being buckled together.

[0116] Optionally, the battery 10 may also include other structures, which are not described one by one here. For example, the battery 10 may also include a busbar component, which is used to realize electrical connection between multiple battery cells 20, such as parallel connection, series connection, or mixed connection. Specifically, the busbar component can realize electrical connection between the battery cells 20 by connecting the electrode terminals of the battery cells 20. Further, the busbar component can be fixed to the electrode terminals of the battery cells 20 by welding. The electrical energy of multiple battery cells 20 can be further led out through the conductive structure through the box body 11.

[0117] According to different power requirements, the number of battery cells 20 in the battery module 200 can be set to any value. Multiple battery cells 20 can be connected in series, parallel or mixed to achieve a larger capacity or power. Since the number of battery cells 20 included in each battery 10 may be large, in order to facilitate installation, the battery cells 20 are grouped and each group of battery cells 20 constitutes a battery module 200. The number of battery cells 20 included in the battery module 200 is not limited and can be set according to requirements. The battery 10 may include multiple battery modules 200, which can be connected in series, parallel or mixed.

[0118] Figure 3 A schematic diagram of the exploded structure of a battery cell 2020 provided in an embodiment of the present application is shown. Figure 3 As shown, the battery cell 20 includes a housing 21 , a pressure relief mechanism 213 , an electrode assembly 22 and a support member 24 .

[0119] The electrode assembly 22 is accommodated in the housing 21. The housing 21 has a first wall 211. The pressure relief mechanism 213 is disposed on the first wall 211. The support member 24 is disposed opposite to the pressure relief mechanism 213 and is used to limit the movement of the electrode assembly 22 toward the first wall 211.

[0120] The battery cell 20 may include a housing 21 and one or more electrode assemblies 22, wherein the housing 21 may have multiple walls, and the first wall 211 refers to one or more walls of the housing 21. The housing 21 of the battery cell 20 may be determined according to the shape of the one or more electrode assemblies 22 after being combined, for example, the housing 21 may be a cuboid, a cube or a cylinder. The housing 21 may include a first wall 211 and a shell 212, and the shell 212 may be a hollow structure, for example, the shell 212 may be a hollow cuboid, a cube or a cylinder, and one of the faces of the shell 212 may have an opening so that one or more electrode assemblies 22 may be placed in the shell 212. For example, when the shell 212 is a hollow cuboid or a cube, one of the planes of the shell 212 is an open face, that is, the plane does not have a wall body so that the inside and outside of the shell 212 are connected. When the shell 212 is a hollow cylinder, the end face of the shell 212 is an open face, that is, the end face does not have a wall body so that the inside and outside of the shell 212 are connected. The first wall 211 covers the opening and is connected to the housing 212 to form a closed cavity for accommodating the electrode assembly 22. The housing 212 is filled with electrolyte, such as electrolyte solution.

[0121] The electrode assembly 22 is a component in the battery cell 20 where an electrochemical reaction occurs. The electrode assembly 22 may be a cylinder, a cuboid, etc. If the electrode assembly 22 is a cylindrical structure, the shell 212 may also be a cylindrical structure. If the electrode assembly 22 is a cuboid structure, the shell 212 may also be a cuboid structure. For ease of explanation, the embodiment of the present application takes the shell 212 as an example of a cuboid. For any electrode assembly 22, the electrode assembly 22 may include at least two tabs, and the at least two tabs may include at least one positive tab and at least one negative tab. The positive tab may be formed by stacking a portion of the positive electrode sheet that is not coated with the positive active material layer, and the negative tab may be formed by stacking a portion of the negative electrode sheet that is not coated with the negative active material layer.

[0122] The battery cell 20 may also include a pressure relief mechanism 213, which can be actuated when the temperature and / or pressure inside the battery cell 20 reaches a threshold value to release the temperature and / or pressure inside the battery cell 20. The "actuation" mentioned in the embodiments of the present application means that the pressure relief mechanism 213 is in action or activated to a certain state, so that the internal pressure and temperature of the battery cell 20 can be released. The action produced by the pressure relief mechanism 213 may include but is not limited to: at least a part of the pressure relief mechanism 213 is broken, shattered, torn or opened, etc. When the pressure relief mechanism 213 is actuated, the high-temperature and high-pressure substances inside the battery cell 20 will be discharged from the actuated part as emissions. In this way, the battery cell 20 can be depressurized and released under controllable pressure or temperature, thereby reducing the possibility of accidents. The emissions from the battery cell 20 mentioned in the embodiments of the present application include but are not limited to: electrolyte, dissolved or split positive and negative pole pieces, fragments of the separator, high-temperature and high-pressure gas generated by the reaction, flames, etc.

[0123] The support member 24 is disposed opposite to the pressure relief mechanism 213, and specifically, can be disposed opposite to the pressure relief mechanism 213 in the thickness direction Z of the first wall 211. Figure 3 As shown, the support member 24 can be disposed between the first wall 211 and the electrode assembly 22. The support member 24 is a structure with a certain rigidity and has a certain ability to resist deformation when subjected to external forces. When a large amount of high-temperature and high-pressure substances are generated inside the battery cell 20, the electrode assembly 22 will move toward the pressure relief mechanism 213 driven by the high-temperature and high-pressure substances. When the support member 24 is squeezed by the electrode assembly 22, the original structural shape can be maintained to a certain extent, and the electrode assembly 22 can be restricted from further moving toward the pressure relief mechanism 213 at the position where the support member 24 is located.

[0124] The support member 24 is arranged opposite to the pressure relief mechanism 213, and can limit the movement of the pressure relief mechanism 213 when the electrode assembly 22 moves toward the pressure relief mechanism 213, so that the electrode assembly 22 is not easy to block the pressure relief mechanism 213, which is beneficial for the pressure relief mechanism 213 to be actuated under the action of high-temperature and high-pressure substances inside the battery cell 20, so as to quickly discharge the temperature or pressure inside the battery cell 20, thereby improving the reliability of the battery cell 20.

[0125] According to some embodiments of the present application, optionally, a discharge channel connecting the pressure relief mechanism 213 and the electrode assembly 22 is provided between the support member 24 and the pressure relief mechanism 213 .

[0126] The support member 24 may have a certain gap with the pressure relief mechanism 213, for example, a certain gap may be formed with the pressure relief mechanism 213 in the thickness direction Z of the first wall 211, and the pressure relief mechanism 213 is connected to the gap. The gap is also connected to the area where the electrode assembly 22 is located, and the area where the pressure relief mechanism 213 is located can also be connected to the area where the electrode assembly 22 is located, forming a discharge channel between the pressure relief mechanism 213 and the electrode assembly 22. In the case where high-temperature and high-pressure substances are generated inside the battery cell 20, the high-temperature and high-pressure substances can reach the pressure relief mechanism 213 through the discharge channel, so that the pressure relief mechanism 213 is actuated.

[0127] In the embodiment of the present application, the discharge channel is conducive to guiding the high-temperature and high-pressure substances to move toward the pressure relief mechanism 213, so that the pressure relief mechanism 213 can be actuated to quickly discharge the high-temperature and high-pressure substances inside the battery cell 20. At the same time, the support member 24 can be used to form the discharge channel, limit the deformation of the discharge channel, reduce the possibility of the electrode assembly 22 blocking the discharge channel, keep the discharge channel unobstructed to a certain extent, and improve the reliability of the battery cell 20.

[0128] According to some embodiments of the present application, optionally, the battery cell 20 includes an insulating member 23 , the insulating member 23 is disposed between the electrode assembly 22 and the first wall 211 , and the supporting member 24 is connected to the insulating member 23 .

[0129] like Figure 4 As shown, Figure 4 It is only used to illustrate that the insulating member 23 is disposed between the electrode assembly 22 and the first wall 211, and no limitation is imposed on the relative position of the insulating member 23 and the support member 24. For example, the support member 24 may be disposed between the insulating member 23 and the first wall 211, or between the insulating member 23 and the electrode assembly 22, or alternatively, may pass through the insulating member 23 and be disposed between the first wall 211 and the electrode assembly 22.

[0130] The insulating member 23 can be used to insulate the electrode assembly 22 from the first wall 211 to reduce the possibility of charging the first wall 211. Optionally, the material of the insulating member 23 may include polypropylene (PP) material, polyphenylene sulfide (PPS) material or soluble polytetrafluoroethylene (PFA) material.

[0131] The insulating member 23 may have a through hole to form at least a portion of the exhaust passage, connecting the pressure relief mechanism 213 and the electrode assembly 22. Specifically, the through hole may be disposed opposite to the pressure relief mechanism 213 in the thickness direction Z of the first wall 211.

[0132] In some embodiments, the support member 24 may be connected to the insulating member 23. Specifically, on one hand, the support member 24 and the insulating member 23 may be connected by injection molding, welding, bonding, clamping, etc.; on the other hand, the support member 24 may be connected to the surface of the insulating member 23 facing the first wall 211 or the surface facing the electrode assembly 22 in the thickness direction Z of the first wall 211. Optionally, the support member 24 may also be at least partially accommodated in the accommodation space formed by the insulating member 23.

[0133] In the embodiment of the present application, the insulating member 23 can play an insulating role to insulate the electrode assembly 22 from the first wall 211 . The connection between the support member 24 and the insulating member 23 can also reduce the possibility of the support member 24 connecting the electrode assembly 22 and the first wall 211 .

[0134] According to some embodiments of the present application, optionally, the support member 24 is disposed between the first wall 211 and the insulating member 23 .

[0135] In some embodiments, the insulating member 23 may be provided with an escape space on the surface of the first wall 211 in the thickness direction Z of the first wall 211, and the escape space is provided between the first wall 211 and the insulating member 23. The escape space may be provided opposite to the pressure relief mechanism 213, and the support member 24 may be accommodated in the escape space. In some embodiments, when the support member 24 is accommodated in the escape space, there may still be a certain gap between the support member 24 and the pressure relief mechanism 213, and the gap may connect the pressure relief mechanism 213 and the electrode assembly 22 to form at least a part of the discharge channel.

[0136] In the normal use state of the battery cell 20, the support member 24 is disposed between the first wall 211 and the insulating member 23 to reduce the possibility of contact between the electrode assembly 22 and the support member 24. At the same time, the insulating member 23 is conducive to separating the support member 24 from at least part of the electrode assembly 22, thereby improving the insulation performance between the support member 24 and the electrode assembly 22.

[0137] According to some embodiments of the present application, optionally, the support member 24 is connected to a surface of the insulating member 23 facing the first wall 211 .

[0138] Figure 5 2 shows a structure in which the support member 24 is connected to the surface of the insulating member 23 facing the first wall 211, as shown in FIG. Figure 5 As shown, in some embodiments, an edge of the support member 24 may be connected to the insulating member 23 , for example, two opposite edges of the support member 24 are connected to the insulating member 23 .

[0139] In some embodiments, the portion of the support member 24 connected to the insulating member 23 may be in contact with the first wall 211 to strengthen the connection strength between the support member 24 and the insulating member 23. The portion of the support member 24 not connected to the insulating member 23 may have a certain gap with the pressure relief mechanism 213 to form a discharge channel connecting the pressure relief mechanism 213 and the electrode assembly 22.

[0140] The portion where the support member 24 is connected to the insulating member 23 can be insulated from the electrode assembly 22 through the insulating member 23. At the same time, the portion where the support member 24 is connected to the insulating member 23 is located between the insulating member 23 and the first wall 211, which can reduce the possibility of the support member 24 being dislocated when being squeezed by the electrode assembly 22 and strengthen the protection of the support member 24 on the pressure relief mechanism 213.

[0141] According to some embodiments of the present application, optionally, the insulating member 23 includes a first through hole 231 , which is arranged opposite to the pressure relief mechanism 213 in the thickness direction Z of the first wall 211 , and at least a portion of the support member 24 is accommodated in the first through hole 231 .

[0142] Figure 5 FIG. 2 shows a structure of the insulating member 23 and the supporting member 24 on one side of the first wall 211 in the thickness direction Z of the first wall 211. Figure 6 The structure of the insulating member 23 and the supporting member 24 on one side of the first wall 211 facing the electrode assembly 22 in the thickness direction Z is shown. Figure 7 It is shown that Figure 5 Cross-section of the structure in the AA direction.

[0143] like Figures 5 to 7 As shown, the first through hole 231 penetrates the insulating member 23 in the thickness direction Z of the first wall 211, and is arranged opposite to the pressure relief mechanism 213 in the thickness direction Z of the first wall 211. The first through hole 231 can connect the area where the pressure relief mechanism 213 is located with the area where the electrode assembly 22 is located at a position opposite to the pressure relief mechanism 213 to form at least a part of the exhaust channel.

[0144] exist Figures 5 to 7 In the structure shown, the portion of the support member 24 not connected to the insulating member 23 may be received in the first through hole 231 , or alternatively, the portion of the support member 24 not connected to the insulating member 23 may pass through the first through hole 231 .

[0145] In some embodiments, a portion of the support member 24 that is not connected to the insulating member 23 may have a certain gap with the first wall 211, such as Figure 7The gap H shown in FIG. 2 can be used to form a discharge channel. In some embodiments, the first through hole 231 can still communicate the pressure relief mechanism 213 with the electrode assembly 22 when at least a portion of the support member 24 is accommodated in the first through hole 231 .

[0146] In the embodiment of the present application, the high-temperature and high-pressure gas inside the battery cell 20 can quickly reach the area where the pressure relief mechanism 213 is located through the first through hole 231, which is conducive to the actuation of the pressure relief mechanism 213 to quickly release the temperature or pressure inside the battery cell 20. At least part of the support member 24 is accommodated in the first through hole 231, so that there is a certain gap between the support member 24 and the pressure relief mechanism 213, which can limit the movement of the electrode assembly 22 toward the first wall 211 while keeping the discharge channel unobstructed.

[0147] According to some embodiments of the present application, optionally, a surface of the support member 24 facing the electrode assembly 22 is provided with an insulating layer.

[0148] In some embodiments, at least the surface of the support member 24 facing the electrode assembly 22 is provided with an insulating layer to improve the insulation performance between the support member 24 and the electrode assembly 22. The insulating layer refers to a structure on the surface of the support member 24 that can play an insulating role, for example, an insulating material can be coated on the surface of the support member 24 to form an insulating layer. Optionally, the surface of the support member 24 can be provided with an insulating layer; optionally, the support member 24 can be made of an insulating material.

[0149] The insulating layer can improve the insulation performance between the support member 24 and the electrode assembly 22 . Even when the electrode assembly 22 is in contact with the support member 24 , the electric energy generated in the electrode assembly 22 is not easily conducted to the first wall 211 , thereby improving the reliability of the battery cell 20 .

[0150] According to some embodiments of the present application, optionally, a second groove 232 is provided on a surface of the insulating member 23 facing the first wall 211 , and an accommodation space is formed between the second groove 232 and the first wall 211 , and the supporting member 24 is accommodated in the accommodation space.

[0151] Figure 8 FIG. 2 shows another structure in which the insulating member 23 and the supporting member 24 are located on one side of the first wall 211 in the thickness direction Z facing the electrode assembly 22. Fig. 9 yes Figure 8 The enlarged structural diagram of the M part in the figure. Fig.10 yes Fig. 9 Cross-section of the structure along the BB direction.

[0152] like Figures 8 to 10As shown, the opening of the second groove 232 faces the first wall 211, and the bottom wall and the side wall of the second groove 232 form a protruding structure 233 on the side of the insulating member 23 facing the electrode assembly 22. In some embodiments, the protruding structure 233 can be made of an insulating material, and optionally, the protruding structure 233 can be made by integral molding with the insulating member 23.

[0153] There is a gap between the bottom wall of the second groove 232 and the first wall 211, and the gap forms an accommodating space. At least part of the support member 24 is accommodated in the accommodating space. Specifically, the part of the support member 24 that is not connected to the insulating member 23 is accommodated in the accommodating space.

[0154] In some embodiments, the insulating member 23 is provided with a first through hole 231, and the second groove 232 may be arranged opposite to the first through hole 231. In the thickness direction Z of the first wall 211, the protrusion structure 233 formed by the second groove 232 on the side of the insulating member 23 facing the electrode assembly 22 may cover a portion of the first through hole 231, and a channel connecting the pressure relief mechanism 213 and the electrode assembly 22 is provided between the second groove 232 and the first through hole 231, and the channel may form at least a portion of the discharge channel.

[0155] The convex structure 233 formed by the second groove 232 on the side of the insulating member 23 facing the electrode assembly 22 can protect the support member 24, so that the support member 24 is not easy to fall to the area where the electrode assembly 22 is located. At the same time, the convex structure 233 can play an insulating role between the support member 24 and the electrode assembly 22, reducing the possibility of the support member 24 conducting the electrode assembly 22 and the first wall 211.

[0156] According to some embodiments of the present application, optionally, the second groove 232 has an opening in the length direction Y of the first wall 211 and / or the width direction X of the first wall 211 , and the opening is used to connect the pressure relief mechanism 213 with the electrode assembly 22 .

[0157] In the embodiment of the present application, the opening opposite to the bottom wall of the second groove 232 faces the first wall 211. In some embodiments, the second groove 232 may have an opening at least at one end of the length direction Y of the first wall 211. Optionally, an opening is provided at least at one end of the width direction X of the first wall 211. Optionally, an opening is provided at least at one end of the length direction Y of the first wall 211 and at least at one end of the width direction X of the first wall 211. In some embodiments, a portion of the side wall of the second groove 232 is an opening, and another portion is connected to the insulating member 23. For example, a portion of the side wall of the second groove 232 in the length direction Y of the first wall 211 is an opening, and the opening connects the pressure relief mechanism 213 and the electrode assembly 22; optionally, a portion of the side wall of the second groove 232 in the width direction X of the first wall 211 is an opening; optionally, a portion of the second groove 232 in the length direction Y and the width direction X of the first wall 211 may be an opening at the same time.

[0158] For example, the second groove 232 has a side wall in the width direction X of the first wall 211 and has an opening at least at one end in the length direction Y of the first wall 211, then the opening in the length direction Y of the first wall 211 can connect the pressure relief mechanism 213 and the electrode assembly 22, and optionally, the opening of the second groove 232 in the length direction Y of the first wall 211 can be connected with the first through hole 231. Similarly, the second groove 232 can have a side wall in the length direction Y of the first wall 211 and have an opening at least at one end in the width direction X of the first wall 211, and the opening connects the pressure relief mechanism 213 and the electrode assembly 22. Optionally, the openings of the second groove 232 at one end in the length direction Y of the first wall 211 and one end in the width direction X of the first wall 211 can also connect the pressure relief mechanism 213 and the electrode assembly 22.

[0159] The opening of the second groove 232 in the length direction Y of the first wall 211 and / or the width direction X of the first wall 211 is conducive to guiding the high-temperature and high-pressure materials inside the battery cell 20 to be discharged quickly in the direction of the pressure relief mechanism 213, so as to quickly release the temperature or pressure inside the battery cell 20, thereby improving the reliability of the battery cell 20.

[0160] According to some embodiments of the present application, optionally, in the thickness direction Z of the first wall 211 , the projection of the bottom wall of the second groove 232 covers the projection of the supporting member 24 .

[0161] like Figures 8 to 10As shown, the bottom wall of the second groove 232 is located between the support member 24 and the electrode assembly 22, separating the support member 24 from the electrode assembly 22. In the thickness direction Z of the first wall 211, the projection of the bottom wall of the second groove 232 covers the projection of the support member 24. In some embodiments, the projection of the protruding structure 233 formed by the bottom wall and the side wall of the second groove 232 on the side of the insulating member 23 facing the electrode assembly 22 may cover the projection of the support member 24.

[0162] The projection of the bottom wall of the second groove 232 covers the projection of the support member 24 , so that the electrode assembly 22 is not easily in direct contact with the support member 24 during the movement toward the first wall 211 , thereby strengthening the insulation between the support member 24 and the electrode assembly 22 and improving the reliability of the battery cell 20 .

[0163] According to some embodiments of the present application, optionally, the support member 24 includes a connected support wall 241 and at least one connecting portion 242 , the support wall 241 is used to limit the movement of the electrode assembly 22 toward the first wall 211 , and the connecting portion 242 is used to connect the insulating member 23 and the support wall 241 .

[0164] Fig.11 FIG. 2 shows a schematic diagram of the structure of a support member 24. Fig.11 As shown, the support member 24 includes a support wall 241 and at least one connecting portion 242, and the support wall 241 is connected to the connecting portion 242. Figures 5 to 10 In the structure shown in FIG. 2 , in the thickness direction Z of the first wall 211 , the support wall 241 is opposite to the pressure relief mechanism 213 , and can limit the movement of the electrode assembly 22 when the electrode assembly 22 moves toward the first wall 211 , so as to reduce the possibility of the electrode assembly 22 blocking the pressure relief mechanism 213 .

[0165] The connecting portion 242 is connected to the insulating member 23, and the supporting wall 241 can be connected to the insulating member 23. Optionally, the supporting wall 241 can be fixedly connected to the connecting portion 242, and the connecting portion 242 is fixedly connected to the insulating member 23, and the connecting wall can fix the supporting member 24 to the insulating member 23.

[0166] In some embodiments, the support wall 241 may be a wall perpendicular to the thickness direction Z of the first wall 211, and the connecting portion 242 may be a wall parallel to the thickness direction Z of the first wall 211, then one end of the connecting portion 242 in the thickness direction Z of the first wall 211 is connected to the insulating member 23, and the other end is connected to the support wall 241. In this case, there may be a certain gap between the support wall 241 and the insulating member 23. Optionally, the support wall 241 and the connecting portion 242 may both be walls perpendicular to the thickness direction Z of the first wall 211, then the support wall 241 and the connecting portion 242 may be connected on the same plane. In this case, the gap between the support wall 241 and the pressure relief mechanism 213 mainly includes the gap between the insulating member 23 and the pressure relief structure.

[0167] The support member 24 is connected to the insulating member 23 via the connecting portion 242 so that a certain gap exists between the support member 24 and the pressure relief structure. The support member 24 can still reserve at least a portion of the discharge channel for the pressure relief mechanism 213 while limiting the movement of the electrode assembly 22, so that the high-temperature and high-pressure materials inside the battery cell 20 can reach the pressure relief mechanism 213 via the discharge channel.

[0168] According to some embodiments of the present application, optionally, the connection portion 242 is snap-connected with the insulating member 23 .

[0169] Fig.12 The structure shown is a structure in which the support member 24 is clamped with the insulating member 23 through the connecting portion 242. The clamping means that the connecting portion 242 of the support member 24 and the insulating member 23 limit each other so that the relative position of the support member 24 and the insulating member 23 is fixed.

[0170] In a possible implementation, the toughness of the support member 24 itself can allow at least a portion of the connection portion 242 to be accommodated in the groove of the insulating member 23 , and the groove can limit the portion of the connection portion 242 accommodated in the groove after the support member 24 returns to its original shape.

[0171] In another possible embodiment, an avoidance space and a groove may be provided on the insulating component 23, and the connecting portion 242 may be transformed from the position of the avoidance space to the position of the groove by moving or rotating, and the groove and the connecting wall may limit each other to achieve fixation between the insulating support component 24 and the insulating component 23.

[0172] The above embodiments are only examples, and the clamping method of the connecting wall and the insulating member 23 can be flexibly set according to actual needs.

[0173] The connection portion 242 and the insulating member 23 are connected by snapping, so that the support member 24 and the insulating member 23 can be fixed relatively easily, and the fixing strength between the two can be enhanced, so that the support member 24 is not easy to fall off from the insulating member 23.

[0174] According to some embodiments of the present application, optionally, the insulating member 23 is provided with a first groove 235 , the opening direction of the first groove 235 is perpendicular to the thickness direction Z of the first wall 211 , and at least a portion of the connecting portion 242 is accommodated in the first groove 235 .

[0175] Fig.13 yes Fig.12 The cross-section of the structure along the CC direction, Fig.14 yes Fig.13 The enlarged structural diagram of the N part. Figure 12 to Figure 14 As shown, the first groove 235 is disposed on the insulating member 23 , forming a certain accommodation space on the insulating member 23 , and at least a portion of the connecting portion 242 is accommodated in the accommodation space formed by the first groove 235 .

[0176] The opening direction of the first groove 235 is perpendicular to the thickness direction Z of the first wall 211. Figure 12 to Figure 14 The opening direction of the first groove 235 shown is toward the width direction X of the first wall 211, and the support member 24 can be fixedly connected to the insulating member 23 in the width direction X of the first wall 211. In some embodiments, the opening direction of the first groove 235 can be toward the length direction Y of the first wall 211, and the support member 24 can be fixedly connected to the insulating member 23 in the length direction Y of the first wall 211. Optionally, the first groove 235 can be provided in both the length direction Y and the width direction X of the first wall 211, and the support member 24 is fixedly connected to the insulating member 23 in the width direction X and the length direction Y of the first wall 211, respectively.

[0177] exist Figure 12 to Figure 14 In the illustrated embodiment, the insulating member 23 can limit the movement of the connection portion 242 in the thickness direction Z of the first wall 211 through the first groove 235 to achieve fixed connection between the connection portion 242 and the insulating member 23 , thereby achieving fixed connection between the support member 24 and the insulating member 23 .

[0178] The first groove 235 can cooperate with the connecting part 242. For example, the shape of the accommodating space formed by the first groove 235 and the shape of the part of the connecting part 242 accommodated in the first groove 235 are mutually interlocked, so that the part of the connecting wall accommodated in the first groove 235 is not easy to shake in the first groove 235, which can improve the connection strength between the supporting member 24 and the insulating member 23.

[0179] The first groove 235 can limit the movement of the connection portion 242 to achieve fixed connection between the support member 24 and the insulating member 23 , and can also improve the connection strength between the support member 24 and the insulating member 23 , making it difficult for the support member 24 to fall off from the insulating member 23 .

[0180] According to some embodiments of the present application, optionally, a first protrusion 234 is provided on the surface of the insulating member 23 , and the first groove 235 is provided in the first protrusion 234 .

[0181] like Figure 12 to Figure 14 As shown, the position where the first groove 235 needs to be provided on the insulating member 23 can be thickened to increase the size of the accommodation space formed by the first groove 235, and the thickened portion is the first protrusion 234 provided on the surface of the insulating member 23. Correspondingly, the portion of the connecting portion 242 accommodated in the first groove 235 can also be appropriately thickened to improve the strength of the connecting portion 242.

[0182] Providing the first protrusion 234 on the surface of the insulating member 23 and providing the first groove 235 in the first protrusion 234 can improve the strength of the insulating member 23 and improve the limiting effect between the insulating member 23 and the support member 24. At the same time, the corresponding thickening of the connecting portion 242 can also improve the strength of the support member 24, so that the support member 24 is not easily damaged when being squeezed by the electrode assembly 22, thereby being able to limit the movement of the electrode assembly 22 to a limited extent.

[0183] According to some embodiments of the present application, optionally, the portion of the connecting portion 242 accommodated in the first groove 235 is provided with a first step structure 243 , the first groove 235 has a second step structure 236 , and the first step structure 243 and the second step structure 236 cooperate with each other.

[0184] like Fig.13 and Fig.14 As shown, the first groove 235 and the connecting portion 242 can be matched with each other through a step structure. For example, along the opening direction of the first groove 235, the end of the first groove 235 away from the opening is narrower, and the end close to the opening is wider.

[0185] In some embodiments, the first groove 235 may be interference fit with the connecting wall to improve the connection strength between the insulating member 23 and the connecting wall. For example, the connecting portion 242 may be interference fit with the first groove 235 in the thickness direction Z of the first wall 211, wherein the interference fit means that when the connecting portion 242 has not yet been accommodated in the first groove 235, the size of the portion of the connecting portion 242 that needs to be accommodated in the first groove 235 in the thickness direction Z of the first wall 211 is larger than the size of the corresponding position in the first groove 235 in the thickness direction Z of the first wall 211, and during the assembly process, the elasticity of the material of the insulating member 23 is used to expand and deform the first groove 235 in the thickness direction Z of the first wall 211 so as to accommodate the connecting portion 242 of the supporting member 24, and after the first groove 235 is restored, it can generate a force to fix at least a part of the connecting portion 242 in the first groove 235.

[0186] During the assembly process, the narrower part of the first step structure 243 first passes through the wider part of the second step structure 236, and then extends into the narrower part of the second step structure 236. The cooperation between the first step structure 243 and the second step structure 236 is conducive to guiding the connecting wall to be accommodated in the first groove 235, thereby reducing the positioning accuracy during the assembly process.

[0187] According to some embodiments of the present application, optionally, the connection portion 242 is connected to a surface of the insulating member 23 facing the first wall 211 .

[0188] In some embodiments, the support member 24 can be connected to the surface of the insulating member 23. Specifically, the connecting portion 242 on the support member 24 can be connected to the surface of the insulating member 23. For example, it can be connected to the surface of the insulating member 23 facing the first wall 211 in the thickness direction Z of the first wall 211.

[0189] like Figures 5 to 10 As shown, the connection portion 242 connects the support wall 241 and the surface of the insulating member 23 facing the first wall 211 . In the battery cell 20 , the portion of the connection portion 242 connected to the insulating member 23 may be located between the insulating member 23 and the first wall 211 .

[0190] In some embodiments, Figures 5 to 7 As shown, the connection portion 242 may include a portion parallel to the thickness direction Z of the first wall 211, and the portion may pass through the first through hole 231, so that the support wall 241 is located on the side of the insulating member 23 facing the electrode assembly 22 in the thickness direction Z of the first wall 211. In this case, in the length and / or width direction X of the first wall 211, the projection of the support member 24 partially overlaps with the projection of the insulating member 23, which can reduce the additional space occupied by the support member 24.

[0191] In some embodiments, Figures 8 to 10 As shown, the connection portion 242 may include a portion parallel to the thickness direction Z of the first wall 211, which may be accommodated in the second groove 232. In this case, the bottom wall and the side wall of the second groove 232 can insulate the connection portion 242, thereby improving the insulation effect of the insulating member 23 on the supporting member 24.

[0192] The connection between the connecting portion 242 and the surface of the insulating member 23 facing the first wall 211 can enable the support member 24 to be fixed by both the first wall 211 and the insulating member 23 at the same time, and is not easily dislocated when squeezed by the electrode assembly 22, and can play a certain protective role for the pressure relief mechanism 213 at a position opposite to the pressure relief mechanism 213.

[0193] According to some embodiments of the present application, optionally, the connection portion 242 is connected to a surface of the insulating member 23 facing the electrode assembly 22 .

[0194] The surface of the connection portion 242 facing the first wall 211 in the thickness direction Z of the first wall 211 is connected to the insulating member 23, and the surface of the connection portion 242 facing the electrode assembly 22 is connected to the support wall 241. In this case, the support member 24 is closer to the electrode assembly 22 than the insulating member 23, and can limit the movement of the electrode assembly 22 before the insulating member 23, so that a certain gap can be maintained between the electrode assembly 22 and the pressure relief mechanism 213, thereby maintaining the unobstructed discharge channel.

[0195] The support wall 241 can limit the deformation of the electrode assembly 22, making it difficult for the electrode assembly 22 to move further toward the pressure relief mechanism 213. The connecting portion 242 can connect the support wall 241 with the insulating member 23, so that the support member 24 can limit the deformation of the electrode assembly 22 at a fixed position, so that a certain gap can be maintained between the electrode assembly 22 and the pressure relief mechanism 213, thereby maintaining the patency of the discharge channel.

[0196] According to some embodiments of the present application, optionally, the connection portion 242 includes at least one first connection wall 2421 parallel to the thickness direction Z of the first wall 211 , and the first connection wall 2421 is used to form a gap between the insulating member 23 and the support wall 241 .

[0197] Fig.11 A possible structure of the support member 24 is shown. Fig.11As shown, the first connecting wall 2421 may be a portion of the connecting portion 242 parallel to the thickness direction Z of the first wall 211. The first connecting wall 2421 is connected to the support wall 241 at one end along the thickness direction Z of the first wall 211, and is connected to the insulating member 23 at the other end. In the case where the connecting portion 242 is connected to the surface of the insulating member 23 facing the first wall 211, there may be a certain gap between the supporting wall 241 and the first wall 211; in the case where the connecting portion 242 is connected to the surface of the insulating member 23 facing the electrode assembly 22, the gap between the supporting wall 241 and the first wall 211 includes the gap between the supporting wall 241 and the insulating member 23, the gap formed by the first through hole 231 of the insulating member 23, and the gap between the insulating member 23 and the first wall 211.

[0198] The gap between the first connecting wall 2421 and the first wall 211 can maintain a certain discharge channel in the area around the pressure relief mechanism 213, so that high-temperature and high-pressure substances can reach the pressure relief mechanism 213 along the discharge channel, thereby actuating the pressure relief mechanism 213 to discharge the high-temperature and high-pressure substances inside the battery cell 20.

[0199] According to some embodiments of the present application, optionally, the connecting portion 242 includes a second connecting wall 2422 , and the second connecting wall 2422 connects the first connecting wall 2421 and the insulating member 23 .

[0200] like Fig.11 As shown, the connecting portion 242 may include a first connecting wall 2421 and a second connecting wall 2422 connected to each other. In some embodiments, the plane where the first connecting wall 2421 is located is perpendicular to the plane where the second connecting wall 2422 is located. Optionally, the plane where the first connecting wall 2421 is located and the plane where the second connecting wall 2422 is located may have a certain angle, which may be an acute angle or an obtuse angle.

[0201] In some embodiments, the second connection wall 2422 may be fixedly connected to the surface of the insulating member 23 , and the support member 24 may be fixedly connected to the insulating member 23 via the second connection wall 2422 of the connection portion 242 .

[0202] The second connecting wall 2422 can increase the connection area between the support member 24 and the insulating member 23, which is beneficial to improving the connection strength between the support member 24 and the insulating member 23, so that the support member 24 is not easily deformed or fallen off from the insulating member 23 when squeezed by the electrode assembly 22, and can effectively limit the movement of the electrode assembly 22.

[0203] According to some embodiments of the present application, optionally, the at least one first connecting wall 2421 includes two first connecting walls 2421 , and the two first connecting walls 2421 are arranged opposite to the edge of the supporting wall 241 .

[0204] exist Fig.11 In the illustrated support member 24, the support member 24 may include two first connecting walls 2421, which are respectively arranged at the edges of the support wall 241 along the width direction X of the first wall 211, that is, both ends of the support wall 241 along the width direction X of the first wall 211 may be respectively connected to one first connecting wall 2421. One end of the first connecting wall 2421 along the thickness direction Z of the first wall 211 is connected to the support wall 241, and the other end is connected to the second connecting wall 2422 or the insulating member 23. In some embodiments, the plane where the second connecting wall 2422 is located may be parallel to the plane where the support wall 241 is located, and staggered with the plane where the support wall 241 is located in the thickness direction Z of the first wall 211.

[0205] Optionally, two first connecting walls 2421 may also be disposed at two ends of the supporting wall 241 along the length direction Y of the first wall 211 .

[0206] The first connecting walls 2421 arranged opposite to each other can make the connection between the supporting member 24 and the insulating member 23 more stable, and are not easily deformed in the process of restricting the movement of the electrode assembly 22 , which is beneficial to better restrict the movement of the electrode assembly 22 .

[0207] According to some embodiments of the present application, optionally, the first connecting wall 2421 has a through hole 246 , and the through hole 246 is used to connect the pressure relief mechanism 213 and the electrode assembly 22 .

[0208] like Fig.11 As shown, the first connecting wall 2421 may have a through hole 246 that penetrates the first connecting wall 2421 in the thickness direction Z of the first connecting wall 2421. For example, in the width direction X of the first wall 211, the first connecting wall 2421 is disposed at both ends of the supporting wall 241, and the through holes 246 may penetrate the first connecting wall 2421 in the width direction X of the first wall 211, and communicate with each other in the width direction X of the first wall 211, forming at least a portion of the exhaust channel, thereby connecting the pressure relief mechanism 213 and the electrode assembly 22.

[0209] The through hole 246 can increase the discharge channel and discharge path inside the battery cell 20, which is beneficial to guide the high-temperature and high-pressure material inside the battery cell 20 to flow in the direction of the pressure relief mechanism 213, so that the pressure relief mechanism 213 can be actuated to quickly discharge the high-temperature and high-pressure material, reducing the possibility of more serious explosion accidents, thereby improving the reliability of the battery cell 20.

[0210] According to some embodiments of the present application, optionally, a projection of the support wall 241 in the thickness direction Z of the first wall 211 covers a projection of the pressure relief mechanism 213 in the thickness direction Z of the first wall 211 .

[0211] In the embodiment of the present application, the support member 24 is arranged opposite to the pressure relief mechanism 213, and in the thickness direction Z of the first wall 211, the projection of the support wall 241 covers the projection of the pressure relief mechanism 213. In this case, the support member 24 can separate the pressure relief mechanism 213 from the electrode assembly 22, and the high-temperature and high-pressure material inside the battery cell 20 can move from the gap between the support member 24 and the first wall 211 to the pressure relief mechanism 213, and be discharged from the battery cell 20 when the pressure relief mechanism 213 is actuated.

[0212] The support member 24 can protect the pressure relief mechanism 213 in a larger range, so that when the electrode assembly 22 moves toward the first wall 211, on the one hand, it will be restricted by the support member 24, and on the other hand, it is difficult to move directly to the pressure relief mechanism 213 and block the pressure relief mechanism 213, thereby maintaining the internal discharge channel of the battery cell 20 unobstructed and improving the reliability of the battery cell 20.

[0213] According to some embodiments of the present application, optionally, the support member 24 is connected to a surface of the first wall 211 facing the electrode assembly 22 in the thickness direction Z of the first wall 211 .

[0214] The support member 24 is disposed inside the battery cell 20 and connected to the surface of the first wall 211 facing the inside of the battery cell 20, which surface may also be the surface of the first wall 211 facing the electrode assembly 22. The support member 24 is disposed opposite to the pressure relief mechanism 213, and at a position opposite to the pressure relief mechanism 213, there is a certain gap between the support member 24 and the pressure relief mechanism 213 in the thickness direction Z of the first wall 211.

[0215] In some embodiments, an insulating layer may be provided on the surface of the support member 24 facing the electrode assembly 22 to reduce the possibility that the support member 24 conducts electricity between the electrode assembly 22 and the first wall 211 .

[0216] The connection between the support member 24 and the first wall 211 can more directly protect the pressure relief mechanism 213 , reduce the possibility of the electrode assembly 22 blocking the pressure relief mechanism 213 when moving toward the first wall 211 , and help improve the reliability of the battery cell 20 .

[0217] According to some embodiments of the present application, optionally, the support member 24 includes a connected support wall 241 and at least one connecting portion 242 , the support wall 241 is used to limit the movement of the electrode assembly 22 toward the first wall 211 , and the connecting portion 242 is used to connect the first wall 211 and the support wall 241 .

[0218] The support member 24 may be Fig.11 In the structure shown, when the support member 24 is connected to the first wall 211, the connecting portion 242 is connected to the first wall 211, the support wall 241 is opposite to the pressure relief mechanism 213, and there is a certain gap between the support wall 241 and the pressure relief mechanism 213 in the thickness direction Z of the first wall 211, and the gap can form at least a part of the discharge channel.

[0219] The connecting portion 242 in the support member 24 can realize the connection between the first wall 211 and the support member 24. The support wall 241 can limit the movement of the electrode assembly 22 while maintaining the patency of the internal discharge channel of the battery cell 20, so that the pressure relief mechanism 213 can be actuated under the action of high temperature and high pressure materials inside the battery cell 20.

[0220] According to some embodiments of the present application, optionally, the connecting portion 242 includes at least one first connecting wall 2421 parallel to the thickness direction Z of the first wall 211 , and the first connecting wall 2421 is used to form a gap between the first wall 211 of the insulating member 23 and the supporting wall 241 .

[0221] The first connecting wall 2421 may be a portion of the connecting portion 242 parallel to the thickness direction Z of the first wall 211. One end of the first connecting wall 2421 along the thickness direction Z of the first wall 211 is connected to the supporting wall 241, and the other end is connected to the first wall 211. The first connecting wall 2421 has a certain length in the thickness direction Z of the first wall 211, so that a certain gap can be formed between the supporting wall 241 and the first wall 211.

[0222] The gap between the first connecting wall 2421 and the first wall 211 can maintain a certain discharge channel in the area around the pressure relief mechanism 213, so that high-temperature and high-pressure substances can reach the pressure relief mechanism 213 along the discharge channel, thereby actuating the pressure relief mechanism 213 to discharge the high-temperature and high-pressure substances inside the battery cell 20.

[0223] According to some embodiments of the present application, optionally, the connecting portion 242 includes a second connecting wall 2422 , and the second connecting wall 2422 connects the first connecting wall 2421 and the first wall 211 of the insulating member 23 .

[0224] The connecting portion 242 may include a first connecting wall 2421 and a second connecting wall 2422 connected to each other. In some embodiments, the plane where the first connecting wall 2421 is located is perpendicular to the plane where the second connecting wall 2422 is located. Optionally, the plane where the first connecting wall 2421 is located and the plane where the second connecting wall 2422 is located may have a certain angle, which may be an acute angle or an obtuse angle.

[0225] In some embodiments, the second connecting wall 2422 may be fixedly connected to the surface of the first wall 211 , and the supporting member 24 may be fixedly connected to the first wall 211 via the second connecting wall 2422 of the connecting portion 242 .

[0226] The second connecting wall 2422 can increase the connection area between the support member 24 and the insulating member 23, which is beneficial to improving the connection strength between the support member 24 and the first wall 211, so that the support member 24 is not easily deformed or falls off the insulating member 23 when squeezed by the electrode assembly 22, and can effectively limit the movement of the electrode assembly 22.

[0227] According to some embodiments of the present application, optionally, the at least one first connecting wall 2421 includes two first connecting walls 2421 , and the two first connecting walls 2421 are arranged opposite to the edge of the supporting wall 241 .

[0228] The support member 24 may include two first connecting walls 2421, which are respectively arranged at the edges of the support wall 241 along the width direction X of the first wall 211, that is, both ends of the support wall 241 along the width direction X of the first wall 211 may be respectively connected to one first connecting wall 2421. One end of the first connecting wall 2421 along the thickness direction Z of the first wall 211 is connected to the support wall 241, and the other end is connected to the second connecting wall 2422 or the first wall 211. In some embodiments, the plane where the second connecting wall 2422 is located may be parallel to the plane where the support wall 241 is located, and staggered with the plane where the support wall 241 is located in the thickness direction Z of the first wall 211.

[0229] Optionally, two first connecting walls 2421 may also be disposed at two ends of the supporting wall 241 along the length direction Y of the first wall 211 .

[0230] The first connecting walls 2421 arranged opposite to each other can make the connection between the supporting member 24 and the first wall 211 more stable, and are not easily deformed in the process of restricting the movement of the electrode assembly 22 , which is beneficial to better restrict the movement of the electrode assembly 22 .

[0231] According to some embodiments of the present application, optionally, the first connecting wall 2421 has a through hole 246 , and the through hole 246 is used to connect the pressure relief mechanism 213 and the electrode assembly 22 .

[0232] The first connection wall 2421 may have a through hole 246 that penetrates the first connection wall 2421 in the thickness direction Z of the first connection wall 2421. For example, in the width direction X of the first wall 211, the first connection wall 2421 is disposed at both ends of the support wall 241, and the through holes 246 may penetrate the first connection wall 2421 in the width direction X of the first wall 211, and communicate with each other in the width direction X of the first wall 211 to form at least a portion of the discharge channel, thereby connecting the pressure relief mechanism 213 and the electrode assembly 22.

[0233] The through hole 246 can increase the discharge channel and discharge path inside the battery cell 20, which is beneficial to guide the high-temperature and high-pressure material inside the battery cell 20 to flow in the direction of the pressure relief mechanism 213, so that the pressure relief mechanism 213 can be actuated to quickly discharge the high-temperature and high-pressure material, reducing the possibility of more serious explosion accidents, thereby improving the reliability of the battery cell 20.

[0234] According to some embodiments of the present application, optionally, a projection of the support wall 241 in the thickness direction Z of the first wall 211 covers a projection of the pressure relief mechanism 213 in the thickness direction Z of the first wall 211 .

[0235] In the embodiment of the present application, the support member 24 is arranged opposite to the pressure relief mechanism 213, and in the thickness direction Z of the first wall 211, the projection of the support wall 241 covers the projection of the pressure relief mechanism 213. In this case, the support member 24 can separate the pressure relief mechanism 213 from the electrode assembly 22, and the high-temperature and high-pressure material inside the battery cell 20 can move from the gap between the support member 24 and the first wall 211 to the pressure relief mechanism 213, and be discharged from the battery cell 20 when the pressure relief mechanism 213 is actuated.

[0236] The support member 24 can protect the pressure relief mechanism 213 in a larger range, so that when the electrode assembly 22 moves toward the first wall 211, on the one hand, it will be restricted by the support member 24, and on the other hand, it is difficult to move directly to the pressure relief mechanism 213 and block the pressure relief mechanism 213, thereby maintaining the internal discharge channel of the battery cell 20 unobstructed and improving the reliability of the battery cell 20.

[0237] According to some embodiments of the present application, optionally, the battery cell 20 includes an insulating member 23 disposed between the electrode assembly 22 and the first wall 211 .

[0238] In some embodiments, the insulating member 23 may be disposed between the support member 24 and the electrode assembly 22. Optionally, the insulating member 23 may have a first through hole 231, and at least a portion of the support member 24 is accommodated in the first through hole 231. Optionally, the insulating member 23 may be provided with a second groove 232, the opening of the second groove 232 faces the first wall 211, and at least a portion of the support member 24 is accommodated in the second groove 232.

[0239] The insulating member 23 can play an insulating role, insulating the electrode assembly 22 from the first wall 211 , and reducing the possibility of electrical conduction between the electrode assembly 22 and the first wall 211 .

[0240] According to some embodiments of the present application, optionally, the insulating member 23 includes a first through hole 231 , which is arranged opposite to the pressure relief mechanism 213 in the thickness direction Z of the first wall 211 , and at least a portion of the support member 24 is accommodated in the first through hole 231 .

[0241] The first through hole 231 penetrates the insulating member 23 in the thickness direction Z of the first wall 211, and is disposed opposite to the pressure relief mechanism 213 in the thickness direction Z of the first wall 211. The first through hole 231 can connect the area where the pressure relief mechanism 213 is located with the area where the electrode assembly 22 is located at a position opposite to the pressure relief mechanism 213 to form at least a portion of the exhaust channel.

[0242] The support member 24 may be completely accommodated in the first through hole 231 of the insulating member 23. Specifically, the support member 24 is connected to the first wall 211, and the first through hole 231 may avoid the support member 24 in the area where the support member 24 is located. Optionally, the support member 24 may be partially accommodated in the first through hole 231 of the insulating member 23. Specifically, the support member 24 is connected to the first wall 211 on one side in the thickness direction Z of the first wall 211, and the other side is located on the side of the insulating member 23 facing the electrode assembly 22, and the support member 24 may pass through the first through hole 231 in the thickness direction Z of the first wall 211.

[0243] In some embodiments, the portion of the support member 24 that is not connected to the first wall 211 may have a certain gap with the first wall 211, and the gap can be used to form a discharge channel. In some embodiments, the first through hole 231 can still connect the pressure relief mechanism 213 and the electrode assembly 22 when accommodating at least a portion of the support member 24.

[0244] In the embodiment of the present application, the high-temperature and high-pressure gas inside the battery cell 20 can quickly reach the area where the pressure relief mechanism 213 is located through the first through hole 231, which is conducive to the actuation of the pressure relief mechanism 213 to quickly release the temperature or pressure inside the battery cell 20. At least part of the support member 24 is accommodated in the first through hole 231, so that there is a certain gap between the support member 24 and the pressure relief mechanism 213, which can limit the movement of the electrode assembly 22 toward the first wall 211 while keeping the discharge channel unobstructed.

[0245] According to some embodiments of the present application, optionally, a surface of the support member 24 facing the electrode assembly 22 is provided with an insulating layer.

[0246] In some embodiments, at least the surface of the support member 24 facing the electrode assembly 22 is provided with an insulating layer to improve the insulation performance between the support member 24 and the electrode assembly 22. The insulating layer refers to a structure on the surface of the support member 24 that can play an insulating role, for example, an insulating material can be coated on the surface of the support member 24 to form an insulating layer. Optionally, the surface of the support member 24 can be provided with an insulating layer; optionally, the support member 24 can be made of an insulating material.

[0247] The insulating layer can improve the insulation performance between the support member 24 and the electrode assembly 22 . Even when the electrode assembly 22 is in contact with the support member 24 , the electric energy generated in the electrode assembly 22 is not easily conducted to the first wall 211 , thereby improving the reliability of the battery cell 20 .

[0248] According to some embodiments of the present application, optionally, a second groove 232 is provided on a surface of the insulating member 23 facing the first wall 211 , and an accommodation space is formed between the second groove 232 and the first wall 211 , and the supporting member 24 is accommodated in the accommodation space.

[0249] The opening of the second groove 232 faces the first wall 211, and the bottom wall and the side wall of the second groove 232 form a protruding structure 233 on the side of the insulating member 23 facing the electrode assembly 22. In some embodiments, the protruding structure 233 can be made of an insulating material, and optionally, the protruding structure 233 can be made by integral molding with the insulating member 23.

[0250] There is a gap between the bottom wall of the second groove 232 and the first wall 211 , and the gap forms an accommodation space, in which at least a portion of the support member 24 is accommodated.

[0251] In some embodiments, the insulating member 23 is provided with a first through hole 231, and the second groove 232 may be arranged opposite to the first through hole 231. In the thickness direction Z of the first wall 211, the protrusion structure 233 formed by the second groove 232 on the side of the insulating member 23 facing the electrode assembly 22 may cover a portion of the first through hole 231, and a channel connecting the pressure relief mechanism 213 and the electrode assembly 22 is provided between the second groove 232 and the first through hole 231, and the channel may form at least a portion of the discharge channel.

[0252] The convex structure 233 formed by the second groove 232 on the side of the insulating member 23 facing the electrode assembly 22 can protect the support member 24, so that the support member 24 is not easy to fall to the area where the electrode assembly 22 is located. At the same time, the convex structure 233 can play an insulating role between the support member 24 and the electrode assembly 22, reducing the possibility of the support member 24 conducting the electrode assembly 22 and the first wall 211.

[0253] According to some embodiments of the present application, optionally, the second groove 232 has an opening in the length direction Y of the first wall 211 and / or the width direction X of the first wall 211 , and the opening is used to connect the pressure relief mechanism 213 with the electrode assembly 22 .

[0254] In the embodiment of the present application, the opening opposite to the bottom wall of the second groove 232 faces the first wall 211. In some embodiments, the second groove 232 may have an opening at least at one end of the length direction Y of the first wall 211. Optionally, an opening is provided at least at one end of the width direction X of the first wall 211. Optionally, an opening is provided at least at one end of the length direction Y of the first wall 211 and at least at one end of the width direction X of the first wall 211. In some embodiments, a portion of the side wall of the second groove 232 is an opening, and another portion is connected to the insulating member 23. For example, a portion of the side wall of the second groove 232 in the length direction Y of the first wall 211 is an opening, and the opening connects the pressure relief mechanism 213 and the electrode assembly 22; optionally, a portion of the side wall of the second groove 232 in the width direction X of the first wall 211 is an opening; optionally, a portion of the second groove 232 in the length direction Y and the width direction X of the first wall 211 may be an opening at the same time.

[0255] For example, the second groove 232 has a side wall in the width direction X of the first wall 211 and has an opening at least at one end in the length direction Y of the first wall 211, then the opening in the length direction Y of the first wall 211 can connect the pressure relief mechanism 213 and the electrode assembly 22, and optionally, the opening of the second groove 232 in the length direction Y of the first wall 211 can be connected with the first through hole 231. Similarly, the second groove 232 can have a side wall in the length direction Y of the first wall 211 and have an opening at least at one end in the width direction X of the first wall 211, and the opening connects the pressure relief mechanism 213 and the electrode assembly 22. Optionally, the openings of the second groove 232 at one end in the length direction Y of the first wall 211 and one end in the width direction X of the first wall 211 can also connect the pressure relief mechanism 213 and the electrode assembly 22.

[0256] The opening of the second groove 232 in the length direction Y of the first wall 211 and / or the width direction X of the first wall 211 is conducive to guiding the high-temperature and high-pressure materials inside the battery cell 20 to be discharged quickly in the direction of the pressure relief mechanism 213, so as to quickly release the temperature or pressure inside the battery cell 20, thereby improving the reliability of the battery cell 20.

[0257] According to some embodiments of the present application, optionally, in the thickness direction Z of the first wall 211 , the projection of the bottom wall of the second groove 232 covers the projection of the supporting member 24 .

[0258] The bottom wall of the second groove 232 is located between the support member 24 and the electrode assembly 22, separating the support member 24 from the electrode assembly 22. In the thickness direction Z of the first wall 211, the projection of the bottom wall of the second groove 232 covers the projection of the support member 24. In some embodiments, the projection of the protruding structure 233 formed by the bottom wall and the side wall of the second groove 232 on the side of the insulating member 23 facing the electrode assembly 22 may cover the projection of the support member 24.

[0259] The projection of the bottom wall of the second groove 232 covers the projection of the support member 24 , so that the electrode assembly 22 is not easily in direct contact with the support member 24 during the movement toward the first wall 211 , thereby strengthening the insulation between the support member 24 and the electrode assembly 22 and improving the reliability of the battery cell 20 .

[0260] According to some embodiments of the present application, optionally, the melting point of the support member 24 is higher than the melting point of the insulating member 23 .

[0261] In the later stage of thermal runaway, the electrode assembly 22 may move toward the first wall 211 driven by the high temperature and high pressure substance, and even abut against the insulating member 23. The insulating member 23 melts and softens under the action of the high temperature and high pressure substance. When the electrode assembly 22 moves further toward the first wall 211, it is easy to deform, blocking the original discharge channel, so that the high temperature and high pressure substance cannot reach the pressure relief mechanism 213 through the discharge channel. In the embodiment of the present application, the melting point of the support member 24 is higher than the melting point of the insulating member 23. In the same temperature environment, the support member 24 is less likely to melt or melt than the insulating member 23, and can maintain the original shape and position inside the battery cell 20, which restricts the electrode assembly 22 moving toward the pressure relief mechanism 213, making it difficult for the electrode assembly 22 to move to a position that blocks the discharge channel, thereby limiting the deformation of the discharge channel, providing a discharge channel for the high temperature and high pressure substance to reach the pressure relief mechanism 213, and is conducive to improving the reliability of the battery cell 20.

[0262] According to some embodiments of the present application, optionally, the melting point of the support member 24 is greater than 100°C.

[0263] In one example, the material of the support member 24 may be a single material, for example, the material of the support member 24 is a single material such as aluminum material or copper material. In this case, the support member 24 has a fixed melting point.

[0264] In another example, the material of the support member 24 may be a composite material. For example, the support member 24 may be a mixed material of aluminum material and copper material. In this case, the support member 24 does not have a fixed melting point, that is, the melting point of the support member 24 is the melting point range of various materials. For example, the melting point of aluminum material is 660°C, and the melting point of copper is 1083°C, then the melting point range of the support member 24 is 660°C to 1083°C, and the melting point of the support member 24 is higher than the melting point of the insulating member 23. It can be understood that the lowest melting point in the melting point range of the support member 24 is higher than the melting point of the insulating member 23.

[0265] For example, if the positive electrode material of the battery cell 20 is a compound with an olivine structure, the melting point of the support member 24 can be greater than 150°C, so that the thermal runaway gas can smoothly reach the pressure relief mechanism 213 before the pressure relief mechanism 213 opens the valve. Further optionally, the melting point of the support member 24 is greater than 500°C, so that the battery cell 20 can still maintain mechanical strength during the thermal runaway process. Among them, the compound with an olivine structure can be selected from lithium iron phosphate, lithium iron manganese phosphate, or a mixture of lithium iron phosphate and lithium iron manganese phosphate.

[0266] For another example, the positive electrode material of the battery cell 20 contains a layered compound, and the melting point of the support member 24 can be greater than 100°C, so that the thermal runaway gas can smoothly reach the pressure relief mechanism 213 before the pressure relief mechanism 213 opens the valve. Further optionally, the melting point of the support member 24 is greater than 400°C, so that the battery cell 20 can still maintain mechanical strength during thermal runaway. Among them, the layered compound can be selected from lithium nickel cobalt manganese oxygen ternary layered materials, or a mixture of lithium iron phosphate and lithium nickel cobalt manganese oxygen ternary layered materials, or a mixture of lithium manganese iron and lithium nickel cobalt manganese oxygen ternary layered materials.

[0267] Optionally, the material of the support member 24 may be a high temperature resistant material. For example, the material of the support member 24 may include at least one hard material selected from metal, graphite, polytetrafluoroethylene, mica, ceramics, and the like.

[0268] In this embodiment, a support member 24 having a melting point greater than 100°C is used, which is advantageous in that the battery cell 20 is not easily melted when thermal runaway occurs, thereby being able to form an exhaust passage connected to the pressure relief mechanism 213 between the first wall 211 and the electrode assembly 22, so that the thermal runaway gas can be discharged to the outside of the battery cell 20 through the pressure relief mechanism 213 in a timely manner, which is beneficial to improving the reliability of the battery cell 20.

[0269] An embodiment of the present application further provides a battery, comprising the battery cell 20 described in any of the above embodiments.

[0270] An embodiment of the present application further provides an electrical device, comprising the battery described in any of the above embodiments, and the battery is used to provide electrical energy to the electrical device.

[0271] The present application provides a battery cell 20, including a housing 21, a pressure relief mechanism 213, an electrode assembly 22 and a support member 24. The electrode assembly 22 is accommodated in the housing 21, the housing 21 has a first wall 211, and the pressure relief mechanism 213 is arranged on the first wall 211. The support member 24 is arranged opposite to the pressure relief mechanism 213, and is used to limit the movement of the electrode assembly 22 toward the first wall 211. The support member 24 may include a connecting portion 242 and a supporting wall 241. In some embodiments, the connecting portion 242 may be connected to the first wall 211. In other embodiments, the battery cell 20 may include an insulating member 23, and the connecting portion 242 is connected to the insulating member 23. For example, the connecting portion 242 may be connected to the surface of the insulating member 23 facing the first wall 211, and the insulating member 23 has a first through hole 231, and at least a portion of the support member 24 is accommodated in the first through hole 231. Optionally, the insulating member 23 is provided with a protruding structure 233, the projection of the protruding structure 233 in the thickness direction Z of the first wall 211 covers the projection of the supporting member 24 in the thickness direction Z of the first wall 211. Optionally, the insulating member 23 is provided with a first protruding portion 234, the first protruding portion 234 has a first groove 235, at least part of the connecting portion 242 of the supporting member 24 is accommodated in the first groove 235, so that the supporting member 24 is engaged with the insulating member 23.

[0272] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A battery cell, characterized in that: include: a housing having a first wall; a pressure relief mechanism, the pressure relief mechanism being arranged on the first wall; an electrode assembly, the electrode assembly being accommodated in the housing; A support member is disposed opposite to the pressure relief mechanism and is used to limit the movement of the electrode assembly toward the first wall.

2. The battery cell according to claim 1, characterized in that: A discharge passage connecting the pressure relief mechanism and the electrode assembly is provided between the support member and the pressure relief mechanism.

3. The battery cell according to claim 1 or 2, characterized in that: include: An insulating member is disposed between the electrode assembly and the first wall, and the supporting member is connected to the insulating member.

4. The battery cell according to claim 3, characterized in that: The supporting member is disposed between the first wall and the insulating member.

5. The battery cell according to claim 3 or 4, characterized in that: The supporting member is connected to a surface of the insulating member facing the first wall.

6. The battery cell according to claim 3, characterized in that: The insulating member includes a first through hole, the first through hole is arranged opposite to the pressure relief mechanism in the thickness direction of the first wall, and at least a portion of the supporting member is accommodated in the first through hole.

7. The battery cell according to claim 6, characterized in that: A surface of the support member facing the electrode assembly is provided with an insulating layer.

8. The battery cell according to any one of claims 3 to 7, characterized in that: A second groove is disposed on a surface of the insulating member facing the first wall. An accommodation space is formed between the second groove and the first wall. The supporting member is accommodated in the accommodation space.

9. The battery cell according to claim 8, characterized in that: The second groove has an opening in the length direction of the first wall and / or the width direction of the first wall, and the opening is used to connect the pressure relief mechanism with the electrode assembly.

10. The battery cell according to claim 8 or 9, characterized in that: In the thickness direction of the first wall, a projection of the bottom wall of the second groove covers a projection of the supporting member.

11. The battery cell according to any one of claims 3 to 10, characterized in that: The support member includes a connected support wall and at least one connecting portion, the support wall is used to limit the movement of the electrode assembly toward the first wall, and the connecting portion is used to connect the insulating member and the support wall.

12. The battery cell according to claim 11, characterized in that: The connecting portion is engaged with the insulating component.

13. The battery cell according to claim 11 or 12, characterized in that: The insulating member is provided with a first groove, the opening direction of the first groove is perpendicular to the thickness direction of the first wall, and at least a part of the connecting portion is accommodated in the first groove.

14. The battery cell according to claim 13, characterized in that: A first protrusion is disposed on the surface of the insulating member, and the first groove is disposed in the first protrusion.

15. The battery cell according to claim 13 or 14, characterized in that: The portion of the connecting portion accommodated in the first groove is provided with a first step structure, the first groove has a second step structure, and the first step structure and the second step structure cooperate with each other.

16. The battery cell according to claim 11, characterized in that: The connection portion is connected to a surface of the insulating member facing the first wall.

17. The battery cell according to claim 11, characterized in that: The connection portion is connected to a surface of the insulating member facing the electrode assembly.

18. The battery cell according to any one of claims 11 to 17, characterized in that: The connection portion includes at least one first connection wall parallel to a thickness direction of the first wall, the first connection wall being used to form a gap between the insulating member and the support wall.

19. The battery cell according to claim 18, characterized in that: The connecting portion includes a second connecting wall connecting the first connecting wall and the insulating member.

20. The battery cell according to claim 18 or 19, characterized in that: At least one of the first connecting walls includes two first connecting walls, and the two first connecting walls are arranged opposite to each other at the edge of the supporting wall.

21. The battery cell according to any one of claims 18 to 20, characterized in that: The first connecting wall has a through hole, and the through hole is used to connect the pressure relief mechanism and the electrode assembly.

22. The battery cell according to any one of claims 18 to 21, characterized in that: A projection of the supporting wall in the thickness direction of the first wall covers a projection of the pressure relief mechanism in the thickness direction of the first wall.

23. The battery cell according to claim 1 or 2, characterized in that: The support member is connected to a surface of the first wall facing the electrode assembly in a thickness direction of the first wall.

24. The battery cell according to claim 23, characterized in that: The support member includes a connected support wall and at least one connecting portion, the support wall is used to limit the movement of the electrode assembly toward the first wall, and the connecting portion is used to connect the first wall and the support wall.

25. The battery cell according to claim 24, characterized in that: The connecting portion includes at least one first connecting wall parallel to a thickness direction of the first wall, and the first connecting wall is used to form a gap between the first wall and the supporting wall.

26. The battery cell according to claim 25, characterized in that: The connecting portion includes a second connecting wall connecting the first connecting wall and the first wall.

27. The battery cell according to claim 25 or 26, characterized in that: At least one of the first connecting walls includes two first connecting walls, and the two first connecting walls are arranged opposite to each other at the edge of the supporting wall.

28. The battery cell according to any one of claims 25 to 27, characterized in that: The first connecting wall has a through hole, and the through hole is used to connect the pressure relief mechanism and the electrode assembly.

29. The battery cell according to any one of claims 24 to 28, characterized in that: A projection of the supporting wall in the thickness direction of the first wall covers a projection of the pressure relief mechanism in the thickness direction of the first wall.

30. The battery cell according to any one of claims 23 to 29, characterized in that: include: An insulating member is disposed between the electrode assembly and the first wall.

31. The battery cell according to claim 30, characterized in that: The insulating member includes a first through hole, the first through hole is arranged opposite to the pressure relief mechanism in the thickness direction of the first wall, and at least a portion of the supporting member is accommodated in the first through hole.

32. The battery cell according to claim 31, characterized in that: A surface of the support member facing the electrode assembly is provided with an insulating layer.

33. The battery cell according to any one of claims 30 to 32, characterized in that: A second groove is disposed on a surface of the insulating member facing the first wall. An accommodation space is formed between the second groove and the first wall. The supporting member is accommodated in the accommodation space.

34. The battery cell according to claim 33, characterized in that: The second groove has an opening in the length direction of the first wall and / or the width direction of the first wall, and the opening is used to connect the pressure relief mechanism with the electrode assembly.

35. The battery cell according to claim 33 or 34, characterized in that: In the thickness direction of the first wall, a projection of the bottom wall of the second groove covers a projection of the supporting member.

36. The battery cell according to any one of claims 3 to 35, characterized in that: The supporting member has a higher melting point than the insulating member.

37. The battery cell according to claim 36, characterized in that: The supporting member has a melting point greater than 100°C.

38. A battery, characterized in that: include: A battery cell as claimed in any one of claims 1 to 37.

39. An electrical device, characterized in that: The battery comprises a battery as described in claim 38, wherein the battery is used to provide electrical energy to the electrical device.

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