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; an electrode assembly, wherein the electrode assembly is accommodated in the shell; an insulating member provided between the electrode assembly and the first wall; and the supporting component is arranged between the insulating component and the electrode assembly, and the supporting component 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 shell having a first wall; an electrode assembly, the electrode assembly being accommodated in the shell; an insulating member, the insulating member being arranged between the electrode assembly and the first wall; and a supporting member, the supporting member being arranged between the insulating member and the electrode assembly, the supporting member being used to limit the movement of the electrode assembly toward the first wall.

[0006] The battery cell provided in the embodiment of the present application can utilize the support member to limit the movement of the electrode assembly toward the first wall, thereby reducing the possibility of the discharge channel or the pressure relief structure being blocked by the electrode assembly. In the event of thermal runaway inside the battery cell, the discharge channel can be kept unobstructed, which is beneficial to the actuation of the pressure relief mechanism to quickly discharge high-temperature and high-pressure substances inside the battery cell, thereby improving the reliability of the battery cell.

[0007] In some embodiments, the melting point of the support member is higher than the melting point of the insulating member.

[0008] In the same temperature environment, the supporting member is less likely to melt or dissolve than the insulating member, and can maintain the original shape and position between the insulating member and the electrode assembly, thereby supporting the electrode assembly moving toward the pressure relief mechanism, limiting the movement of the electrode assembly toward the first wall, and making it difficult for the electrode assembly to move to a position that blocks the discharge channel, thereby 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.

[0009] In some embodiments, the melting point of the support member is greater than 100°C.

[0010] In this embodiment, a support member with a melting point greater than 100°C is used. This is advantageous in that the support member is not easily melted when thermal runaway occurs in the battery cell, thereby effectively limiting the movement of the electrode assembly and maintaining the patency of the exhaust passage connected to the pressure relief mechanism, 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.

[0011] In some embodiments, the support member is disposed along an edge of the insulating member.

[0012] The support member is arranged at the edge of the insulating member to reduce the possibility of the edge of the first wall abutting against the electrode assembly as much as possible, so that the high-temperature and high-pressure material in the battery cell can reach the pressure relief mechanism.

[0013] In some embodiments, the support member is located at an edge of the insulating member in a width direction of the first wall.

[0014] The support member is arranged along the longer side of the insulating member so that the support member can play a certain supporting role for the insulating member and the electrode assembly in a larger range, limit the movement of the electrode assembly, and limit the deformation of the exhaust passage.

[0015] In some embodiments, the support members are spaced apart along the length direction of the first wall.

[0016] The gaps between the support components can serve as channels for high-temperature and high-pressure substances to pass through, which is beneficial for high-temperature and high-pressure substances generated by thermal runaway to quickly reach the pressure relief mechanism.

[0017] In some embodiments, the supporting member is located at an edge of the insulating member in the length direction of the first wall.

[0018] The support member is arranged on the short side of the insulating member to limit the movement of the electrode assembly toward the first wall at the corresponding position of the insulating member, thereby reducing the probability of the electrode assembly blocking the discharge channel and keeping the discharge channel unobstructed.

[0019] In some embodiments, a pressure relief mechanism is disposed on the first wall, and the support member is disposed along the circumference of the pressure relief mechanism.

[0020] The support member is arranged along the circumference of the pressure relief mechanism, which can more directly limit the electrode assembly around the pressure relief mechanism from moving further toward the pressure relief mechanism, thereby limiting the deformation of the discharge channel near the pressure relief mechanism and reducing the possibility of the pressure relief mechanism and the discharge channel being blocked by the electrode assembly. The high-temperature and high-pressure substances inside the battery cell can reach the pressure relief mechanism through the discharge channel, so that the pressure relief mechanism is actuated to discharge the high-temperature and high-pressure substances inside the battery cell, thereby improving the reliability of the battery cell.

[0021] In some embodiments, a plurality of the support members are continuously arranged along the circumference of the pressure relief mechanism, and the plurality of the support members enclose to form a receiving space, and the pressure relief mechanism is arranged in the receiving space.

[0022] The continuous arrangement of multiple support members along the circumference of the pressure relief mechanism can strengthen the restriction on the movement of the electrode assembly in the area around the pressure relief mechanism, maintain the unobstructed discharge channel in the area around the pressure relief mechanism, and reduce the probability of the electrode assembly moving toward the first wall and blocking the pressure relief mechanism on the first wall.

[0023] In some embodiments, the supporting member includes an elongated main body.

[0024] The main body is in an elongated strip shape, which can limit the movement of the electrode assembly within a larger range without affecting the discharge capacity of the discharge channel, thereby maintaining the unobstructed discharge channel, reducing the possibility of deformation of the discharge channel resulting in the inability to discharge high-temperature and high-pressure materials, and improving the reliability of the battery cell.

[0025] In some embodiments, the support member is interference fit with the insulating member.

[0026] In this way, the support member can be fixed in the first gap more easily, so that the support member is not easy to fall off the insulating member, which is beneficial to maintaining the original position and limiting the movement of the electrode assembly when high temperature and high pressure substances are generated inside the battery cell, and is beneficial to improving the reliability of the battery cell.

[0027] In some embodiments, the support member is interference-fitted with the insulating member at both ends of the main body in the extension direction.

[0028] In this way, the movement of the electrode assembly can be restricted by the larger surface of the support member, which is beneficial to improving the restriction effect on the electrode assembly. At the same time, this can also make the assembly process simpler.

[0029] In some embodiments, the support member includes a connected support wall and at least one connecting wall, the support wall is used to limit the movement of the electrode assembly toward the first wall, and the connecting wall is used to connect the insulating member and the support wall.

[0030] The support member is connected to the insulating member through the connecting wall so that there is a certain gap 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 limiting the movement of the electrode assembly, so that the substances inside the battery cell can reach the pressure relief mechanism through the discharge channel.

[0031] In some embodiments, the connecting wall is snap-fitted to the insulating member.

[0032] The connecting wall and the insulating member can be connected by snapping to 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.

[0033] 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 portion of the connecting wall is accommodated in the first groove.

[0034] The first groove can limit the movement of the connecting wall, 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.

[0035] In some embodiments, a protrusion is disposed on the surface of the insulating member, and the first groove is disposed in the protrusion.

[0036] Providing a protrusion on the surface of the insulating member and providing the first groove in the 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.

[0037] In some embodiments, a portion of the connecting wall 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.

[0038] 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.

[0039] In some embodiments, the connection wall is connected to a surface of the insulating member facing the electrode assembly.

[0040] 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 wall 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.

[0041] In some embodiments, the connecting wall includes at least one first connecting portion parallel to a thickness direction of the first wall, and the first connecting portion is used to form a gap between the insulating member and the supporting wall.

[0042] While limiting the movement of the electrode assembly, the gap formed by the first connecting portion can maintain a certain discharge channel in the area surrounding 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 a large amount of high-temperature and high-pressure substances generated by thermal runaway inside the battery cell.

[0043] In some embodiments, the connecting wall includes a second connecting portion, and the first connecting portion is connected to the second connecting portion.

[0044] The second connecting portion 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 insulating member, 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.

[0045] In some embodiments, at least one of the first connection portions includes two first connection portions, and the two first connection portions are arranged opposite to each other at edges of the supporting wall.

[0046] The first connecting parts arranged opposite to each other can make the connection between the supporting member and the insulating member more stable, and are not easy to deform in the process of restricting the movement of the electrode assembly, which is conducive to better restricting the movement of the electrode assembly. At the same time, the interval between the two first connecting parts can be used as a channel for high-temperature and high-pressure substances to pass through, which is conducive to the high-temperature and high-pressure substances generated by thermal runaway to flow to the pressure relief mechanism, and then discharged to the outside of the battery cell through the pressure relief mechanism.

[0047] In some embodiments, the first connecting portion has a through hole, and the through hole is used to connect the pressure relief mechanism and the electrode assembly.

[0048] 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 discharge the high-temperature and high-pressure materials, thereby reducing the possibility of more serious explosion accidents, thereby improving the reliability of the battery cell.

[0049] 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.

[0050] 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.

[0051] In some embodiments, the first wall is provided with a pressure relief mechanism, and the supporting member is arranged opposite to the pressure relief mechanism.

[0052] The relative arrangement of the support member and the pressure relief mechanism can provide protection for the pressure relief mechanism. When the electrode assembly moves toward the pressure relief mechanism driven by the high-temperature and high-pressure substances generated by thermal runaway, the continued movement of the electrode assembly can be restricted at a position relative to the pressure relief mechanism, so that a certain gap is maintained between the electrode assembly and the pressure relief mechanism as much as possible, reducing the possibility of the discharge channel or the pressure relief structure being blocked by the electrode assembly, which is beneficial to the actuation of the pressure relief mechanism to quickly discharge the high-temperature and high-pressure substances inside the battery cell, thereby improving the reliability of the battery cell.

[0053] In some embodiments, a pressure relief mechanism is disposed on the first wall, and the insulating member has a discharge channel connecting the pressure relief mechanism and the electrode assembly.

[0054] The discharge channel can guide the high-temperature and high-pressure substances inside the battery cell to flow to the area of ​​the pressure relief mechanism, which is conducive to the timely actuation of the pressure relief mechanism and reduces the possibility of explosion caused by the high-temperature and high-pressure substances inside the battery cell.

[0055] In some embodiments, the insulating member includes a side wall, the side wall is parallel to the thickness direction of the first wall, and a discharge hole is provided on the side wall and penetrates the side wall in the thickness direction of the side wall, and the discharge hole is used to form the discharge channel.

[0056] The discharge holes on the side wall can form a discharge channel inside the battery cell, guiding the high-temperature and high-pressure substances to flow toward the pressure relief mechanism, which is beneficial to the actuation of the pressure relief structure to quickly discharge the high-temperature and high-pressure substances inside the battery cell, thereby improving the reliability of the battery cell.

[0057] In some embodiments, the insulating member includes a main body wall, which is perpendicular to a thickness direction of the first wall and connected to the side wall.

[0058] The main body wall can play an insulating role in a large range and provide space for the setting of supporting components. It can form a discharge channel while protecting the pressure relief mechanism to guide high-temperature and high-pressure materials to flow to the pressure relief mechanism.

[0059] In some embodiments, the side wall includes a first side portion, the first side portion is arranged on both sides of the pressure relief mechanism in the length direction of the first wall, and the discharge hole includes a first through hole, the first through hole penetrates the first side portion in the length direction of the first wall, and the first through hole is used to form the discharge channel.

[0060] The first side portion and the first through hole can form a discharge channel in the surrounding area of ​​the pressure relief mechanism, which is beneficial for guiding the high-temperature and high-pressure substances generated by thermal runaway to flow to the area of ​​the pressure relief mechanism when thermal runaway occurs inside the battery cell, so that the pressure relief mechanism can be actuated in time, thereby improving the reliability of the battery cell.

[0061] In some embodiments, the insulating member has a second through hole penetrating the insulating member in the thickness direction of the first wall, the second through hole is arranged opposite to the pressure relief mechanism, and the second through hole is used to form the discharge channel.

[0062] The second through hole can more directly connect the pressure relief mechanism and the electrode assembly, so that the high-temperature and high-pressure material inside the battery cell can flow to the pressure relief mechanism faster, so that the pressure relief mechanism can be actuated in time, thereby improving the reliability of the battery cell.

[0063] In some embodiments, the supporting member is provided with a third through hole, and the third through hole is used to form the exhaust channel.

[0064] The third through hole can provide a path for the high-temperature and high-pressure material to flow inside the battery cell, which is beneficial to the discharge of the high-temperature and high-pressure material, so that the pressure relief mechanism can be actuated in time, thereby improving the reliability of the battery cell.

[0065] In some embodiments, a surface of the support member facing the electrode assembly in the thickness direction of the first wall and / or a surface of the support member facing the first wall in the thickness direction of the first wall has an insulating layer.

[0066] The insulating layer can improve the insulation performance between the support member and the first wall, reduce the possibility that the outer shell of the battery cell is charged through the support member, and thus improve the reliability of the battery cell.

[0067] In a second aspect, a battery is provided, comprising the battery cell described in any embodiment of the first aspect.

[0068] In a third aspect, an electrical device is provided, comprising a battery as described in any embodiment of the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] 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.

[0070] Figure 1 It is a structural schematic diagram of a vehicle provided in an embodiment of the present application.

[0071] Figure 2 It is a schematic diagram of the structure of a battery provided in an embodiment of the present application.

[0072] Figure 3 It is a schematic diagram of the structure of a battery cell provided in an embodiment of the present application.

[0073] Figure 4 It is a structural schematic diagram of a first wall, an insulating component and a supporting component provided in an embodiment of the present application.

[0074] Figure 5 yes Figure 4 A schematic diagram of the decomposition structure of the medium.

[0075] Figure 6 It is a schematic diagram of the structure of another first wall, insulating component and supporting component provided in an embodiment of the present application.

[0076] Figure 7 It is a schematic diagram of the structure of another first wall, insulating component and supporting component provided in an embodiment of the present application.

[0077] Figure 8 It is a schematic diagram of the structure of another first wall, insulating component and supporting component provided in an embodiment of the present application.

[0078] Fig. 9 It is a structural schematic diagram of a supporting component provided in an embodiment of the present application.

[0079] Fig.10 This is a view of a structure of a first wall, an insulating member, and a supporting member provided in an embodiment of the present application along the thickness direction of the first wall.

[0080] Fig.11 yes Fig.10 A cross-sectional view of the structure along the AA direction.

[0081] Fig.12 yes Fig.11 Schematic diagram of the enlarged structure of part B.

[0082] Fig.13 This is a simplified structural diagram of a discharge path provided in an embodiment of the present application.

[0083] In the drawings, the drawings are not drawn to scale. DETAILED DESCRIPTION

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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).

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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 toward the direction of the pressure relief mechanism driven by the high-temperature and high-pressure substances, blocking the pressure relief mechanism. Some structures in the battery cell used to form the exhaust channel may also melt in a high-temperature environment, further reducing the emission, resulting in the battery cell being unable to quickly discharge the high-temperature and high-pressure substances, making the battery cell prone to cracking and reducing the reliability of the battery cell.

[0095] 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 provided on the surface of the insulating member facing the electrode assembly. Even if the electrode assembly moves toward the pressure relief mechanism driven by the high-temperature and high-pressure substance, the support member can limit the deformation of the electrode assembly, reduce the distance 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 unobstructed discharge channel, which is conducive to increasing the discharge speed of the high-temperature and high-pressure substance inside the battery cell and improving the reliability of the battery cell.

[0096] 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.

[0097] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0098] like Figure 1As 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.

[0099] 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.

[0100] 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.

[0101] For example, unlike Figure 2As 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.

[0102] 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.

[0103] 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.

[0104] Figure 3 FIG. 1 shows a schematic diagram of the exploded structure of a battery cell 20 provided in an embodiment of the present application. Figure 3 As shown, the battery cell 20 includes a housing 21, an electrode assembly 22, an insulating member 23 and a supporting member 24. The housing 21 has a first wall 211, and the electrode assembly 22 is accommodated in the housing 21. The insulating member 23 is disposed between the electrode assembly 22 and the first wall 211, and the supporting member 24 is disposed between the insulating member 23 and the electrode assembly 22, and the supporting member 24 is used to limit the movement of the electrode assembly 22 toward the first wall 211.

[0105] 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.

[0106] The electrode assembly 22 is a component in the battery cell 20 where an electrochemical reaction occurs. The electrode assembly 22 can be a cylinder, a cuboid, etc. If the electrode assembly 22 is a cylindrical structure, the housing 21 can also be a cylindrical structure. If the electrode assembly 22 is a cuboid structure, the housing 21 can also be a cuboid structure. For ease of explanation, the embodiment of the present application is described as an example of a housing 21 being 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 pole tab and at least one negative pole tab. The positive pole 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 pole tab may be formed by stacking a portion of the negative electrode sheet that is not coated with the negative active material layer.

[0107] The battery cell 20 may also include an electrode terminal 214. The first wall 211 is generally in the shape of a flat plate. The electrode terminal 214 is fixed on the flat surface of the first wall 211. The electrode terminal 214 includes a positive electrode terminal 214a and a negative electrode terminal 214b. Each electrode terminal 214 is provided with a corresponding connecting member 2525, or it may also be called a current collecting member, which is located between the first wall 211 and the electrode assembly 22 and is used to electrically connect the electrode assembly 22 and the electrode terminal 214. The positive pole tabs of one or more electrode assemblies 22 are connected to the positive electrode terminal 214a through a connecting member 2525, and the negative pole tabs of one or more electrode assemblies 22 are connected to the negative electrode terminal 214b through another connecting member 2525. In the battery cell 20, according to actual use requirements, the electrode assembly 22 can be provided as a single or multiple.

[0108] The insulating member 23 is disposed between the electrode assembly 22 and the first wall 211, and is used to insulate the electrode assembly 22 from the first wall 211, and reduce the possibility of the first wall 211 being charged. Optionally, the material of the insulating member 23 may include polypropylene (PP) material, polyphenylene sulfide (PPS) material, or soluble polytetrafluoroethylene (PFA) material, etc. The insulating member 23 may have a certain accommodation space for accommodating the connecting member 25 and the pole ear of the electrode assembly 22. The electric energy generated in the electrode assembly 22 can be led to the electrode terminal 214 through the pole ear and the connecting member 25 to provide it to the electrical device.

[0109] The support member 24 is disposed between the insulating member 23 and the electrode assembly 22. Figures 4 to 8 As shown, specifically, the support member 24 may be disposed on a surface of the insulating member 23 facing the electrode assembly 22 in the thickness direction Z of the first wall 211 . Figure 4 2 shows a structure of a first wall 211, an insulating member 23 and a supporting member 24. Figure 5 for Figure 4 Schematic diagram of the decomposition structure, Figure 6 and Figure 7 Several schematic diagrams of the exploded structures of the first wall 211, the insulating member 23 and the supporting member 24 are shown respectively. Figure 8 Another structure of the first wall 211 , the insulating member 23 and the supporting member 24 is shown.

[0110] In a possible implementation, the support member 24 may be fixedly connected to the insulating member 23 to reduce the possibility of the support member 24 falling off during the assembly process. Figure 4 and Figure 5 In the structure shown, the support member 24 can be bonded to the insulating member 23 at both ends of the first wall 211 in the length direction Y; Figure 6 and Figure 7 In the structure shown, the support member 24 can be bonded to the insulating member 23 at both ends of the first wall 211 in the width direction X; Figure 8 In the structure shown, the four sides of the support member 24 can be bonded to the insulating member 23. In another possible implementation, the support member 24 can be interference fit with the insulating member 23, for example, Figure 4 and Figure 5 In the structure shown, the support member 24 can be interference-fitted with the insulating member 23 in the length direction Y of the first wall 211; Figure 6 and Figure 7 In the structure shown, the support member 24 may be interference-fitted with the insulating member 23 in the width direction X of the first wall 211 .

[0111] In some embodiments, the support member 24 may be made of a different material than the insulating member 23. For example, the hardness, melting point, and other properties of the material of the support member 24 may be different from those of the material of the insulating member 23. Specifically, the material of the support member 24 may be a high temperature resistant material. That is, when the battery cell 20 has a thermal runaway, the support member 24 will not be melted by the high temperature material generated by the thermal runaway. Optionally, the material of the support member 24 may include at least one hard material selected from metal, graphite, polytetrafluoroethylene, mica, or ceramics.

[0112] In some cases, the electrode assembly 22 may move toward the first wall 211. For example, during transportation or use, the shaking of the battery cell 20 may cause the electrode assembly 22 to move toward the first wall 211, blocking the discharge channel around the first wall 211; or, in the case of thermal runaway inside the battery cell 20, the electrode assembly 22 moves toward the first wall 211 driven by high-temperature and high-pressure materials, which may also block the discharge channel around the first wall 211. In the embodiment of the present application, the support member 24 is disposed between the insulating member 23 and the electrode assembly 22. In the process of the electrode assembly 22 moving toward the first wall 211, the support member 24 can play a certain blocking role and limit the further movement of the electrode assembly 22 toward the first wall 211.

[0113] The battery cell 20 provided in the embodiment of the present application can utilize the support member 24 to limit the movement of the electrode assembly 22 toward the first wall 211, thereby reducing the possibility of the discharge channel or the pressure relief structure being blocked by the electrode assembly 22. In the event of thermal runaway inside the battery cell 20, the discharge channel can be kept unobstructed, which is beneficial to the actuation of the pressure relief mechanism 213 to quickly discharge high-temperature and high-pressure materials inside the battery cell 20, thereby improving the reliability of the battery cell 20.

[0114] 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 .

[0115] 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, and is easily deformed when the electrode assembly 22 moves further toward the first wall 211, 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 between the insulating member 23 and the electrode assembly 22, supporting the electrode assembly 22 moving toward the pressure relief mechanism 213, limiting the movement of the electrode assembly 22 toward the first wall 211, making it difficult for the electrode assembly 22 to move to a position that blocks the discharge channel, thereby providing a discharge channel for the high temperature and high pressure substance to reach the pressure relief mechanism 213, which is conducive to improving the reliability of the battery cell 20.

[0116] According to some embodiments of the present application, optionally, the melting point of the support member 24 is greater than 100°C.

[0117] 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.

[0118] 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.

[0119] For example, when 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.

[0120] 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.

[0121] 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.

[0122] In this embodiment, a support member 24 having a melting point greater than 100°C is used, which is advantageous in that the support member 24 is not easily melted when thermal runaway occurs in the battery cell 20, thereby effectively limiting the movement of the electrode assembly 22 and maintaining the patency of the exhaust passage connected to the pressure relief mechanism 213, 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 in improving the reliability of the battery cell 20.

[0123] According to some embodiments of the present application, optionally, the support member 24 is disposed along an edge of the insulating member 23 .

[0124] like Figures 4 to 6 As shown, the edge of the insulating member 23 refers to the long side and / or wide side of the insulating member 23. Specifically, on a plane perpendicular to the thickness direction Z of the first wall 211, the insulating member 23 may be approximately rectangular, and the support member 24 may be located on the long side and / or wide side of the rectangle. For example, Figure 4 and Figure 5 The diagram shows a case where the support member 24 is disposed on the long side of the rectangle, and the support member 24 extends along the length direction Y of the first wall 211; Figure 6 The supporting member 24 is shown as being disposed on the wide side of the rectangle, and the supporting member 24 extends along the width direction X of the first wall 211 .

[0125] The support member 24 is disposed at the edge of the insulating member 23 to reduce the possibility of the edge of the first wall 211 abutting against the electrode assembly 22 as much as possible, so that the high-temperature and high-pressure material in the battery cell 20 can reach the pressure relief mechanism.

[0126] According to some embodiments of the present application, optionally, the support member 24 is located at an edge of the insulating member 23 in the width direction X of the first wall 211 .

[0127] The edge of the insulating member 23 in the width direction X of the first wall 211 refers to the long side of the insulating member 23, that is, the side of the insulating member 23 extending along the length direction Y of the first wall 211. Figure 4 and Figure 5 As shown, the support member 24 may be located at least on one side edge of the insulating member 23 in the width direction X of the first wall 211 .

[0128] In some embodiments, the support member 24 may extend from one end to the other end of the long side of the insulating member 23 ; alternatively, the support member 24 may be disposed only on a portion of the long side of the insulating member 23 .

[0129] The support member 24 is arranged along the longer side of the insulating member 23 so that the support member 24 can play a certain supporting role for the insulating member 23 and the electrode assembly 22 in a larger range, limit the movement of the electrode assembly 22, and limit the deformation of the exhaust passage.

[0130] According to some embodiments of the present application, optionally, the support members 24 are arranged at intervals along the length direction Y of the first wall 211 .

[0131] like Figure 4 and Figure 5 As shown, the support members 24 may extend along the length direction Y of the first wall 211 and be spaced apart in the length direction Y of the first wall 211 , which may reduce the overall weight of the battery cell 20 while limiting the movement of the electrode assembly 22 toward the first wall 211 .

[0132] Optionally, Figure 4 and Figure 5 For example, Figure 4 and Figure 5 The figure shows that two support members 24 are provided in the length direction Y of the first wall 211, and the interval between the two support members 24 is located in the surrounding area of ​​the pressure relief mechanism 213. This can provide more space for the high-temperature and high-pressure material to move toward the pressure relief mechanism 213, which is conducive to guiding the high-temperature and high-pressure material to move toward the pressure relief mechanism 213.

[0133] The gaps between the support members 24 can serve as passages for high-temperature and high-pressure substances to pass through, which is beneficial for high-temperature and high-pressure substances generated by thermal runaway to quickly reach the pressure relief mechanism 213 .

[0134] According to some embodiments of the present application, optionally, the support member 24 is located at an edge of the insulating member 23 in the length direction Y of the first wall 211 .

[0135] The edge of the insulating member 23 in the length direction Y of the first wall 211 refers to the wide side of the insulating member 23, that is, the side of the insulating member 23 extending along the width direction X of the first wall 211, which can also be called the short side of the insulating member 23. Figure 6 As shown, the support member 24 may extend along the width direction X of the first wall 211. Optionally, the support member 24 may be located at least one side edge of the insulating member 23 in the length direction Y of the first wall 211. Optionally, the support members 24 may be arranged at intervals along the width direction X of the first wall 211.

[0136] In some embodiments, the support member 24 may be disposed at the edges of the insulating member 23 in the length direction Y and the width direction X of the first wall 211 at the same time.

[0137] The support member 24 disposed on the short side of the insulating member 23 can limit the movement of the electrode assembly 22 toward the first wall 211 at the corresponding position of the insulating member 23, reduce the probability of the electrode assembly 22 blocking the discharge channel, and keep the discharge channel unobstructed.

[0138] According to some embodiments of the present application, optionally, a pressure relief mechanism 213 is provided on the first wall 211 , and the support member 24 is provided along the circumference of the pressure relief mechanism 213 .

[0139] The pressure relief mechanism 213 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.

[0140] The circumference of the pressure relief mechanism 23 refers to the direction surrounding the pressure relief mechanism 23. The support members 24 can be arranged continuously along the circumference of the pressure relief mechanism 23, or can be arranged at intervals along the circumference of the pressure relief mechanism 23. In some embodiments, the support members 24 can be arranged in the surrounding area of ​​the pressure relief mechanism 213. Figure 7The illustrated case is that the support member 24 extends along the width direction X of the first wall 211 and is disposed on at least one side of the pressure relief mechanism 213 in the length direction Y of the first wall 211. Optionally, the support member 24 may extend along the length direction Y of the first wall 211 and be disposed on at least one side of the pressure relief mechanism 213 in the width direction X of the first wall 211. Optionally, a support member 24 extending along the width direction X of the first wall 211 may be disposed on at least one side of the pressure relief mechanism 213 in the length direction Y of the first wall 211, and a support member 24 extending along the length direction Y of the first wall 211 may be disposed on at least one side of the pressure relief mechanism 213 in the width direction X of the first wall 211. In a possible embodiment, the support member 24 may be at least a portion of an annular structure.

[0141] The support member 24 is arranged along the circumference of the pressure relief mechanism 213, which can more directly limit the electrode assembly 22 around the pressure relief mechanism 213 from further moving toward the pressure relief mechanism 213, thereby limiting the deformation of the discharge channel near the pressure relief mechanism 213, and reducing the possibility that the pressure relief mechanism 213 and the discharge channel are blocked by the electrode assembly 22. The high-temperature and high-pressure substances inside the battery cell 20 can reach the pressure relief mechanism 213 through the discharge channel, so that the pressure relief mechanism 213 is actuated to discharge the high-temperature and high-pressure substances inside the battery cell 20, thereby improving the reliability of the battery cell 20.

[0142] According to some embodiments of the present application, optionally, a plurality of support members 24 are continuously arranged along the circumference of the pressure relief mechanism 213 , and the plurality of support members 24 enclose a receiving space, and the pressure relief mechanism 213 is arranged in the receiving space.

[0143] In some embodiments, support members 24 may be disposed around the pressure relief mechanism 213. For example, support members 24 may be disposed on both sides of the pressure relief mechanism 213 in the length direction Y and the width direction X of the first wall 211. The continuous arrangement of multiple support members 24 may refer to multiple support members 24 being connected end to end. In this case, the multiple support members 24 can enclose a certain accommodation space, enclosing the pressure relief mechanism 213 in the middle, that is, the pressure relief mechanism 213 is located in the accommodation space.

[0144] Multiple support members 24 are continuously arranged along the circumference of the pressure relief mechanism 213 to strengthen the restriction on the movement of the electrode assembly 22 in the area around the pressure relief mechanism 213, thereby maintaining the unobstructed discharge channel in the area around the pressure relief mechanism 213 and reducing the probability of the electrode assembly 22 moving toward the first wall 211 and blocking the pressure relief mechanism 213 on the first wall 211.

[0145] According to some embodiments of the present application, optionally, the support member 24 includes a long strip-shaped main body.

[0146] A support member 24 provided in an embodiment of the present application includes a long strip-shaped main body, which refers to a portion of the support member 24 extending in a certain direction. In some embodiments, the support member 24 may extend from one end of the insulating member 23 to the other end along the length direction Y of the first wall 211. Optionally, the main body may be a columnar structure, such as a cylinder, a prism, etc. In some embodiments, the support member 24 may also include structures such as protrusions or grooves.

[0147] The main body is in an elongated strip shape, which can limit the movement of the electrode assembly 22 within a larger range without affecting the discharge capacity of the discharge channel, thereby maintaining the patency of the discharge channel, reducing the possibility of deformation of the discharge channel resulting in the inability to discharge high-temperature and high-pressure materials, and improving the reliability of the battery cell 20.

[0148] According to some embodiments of the present application, optionally, the support member 24 and the insulating member 23 are interference fit.

[0149] Interference fit means that the size of the support member 24 in a certain direction is larger than the size of the part of the insulating member 23 used to accommodate the support member 24 in this direction. During the assembly process, the elasticity of the material of the insulating member 23 is used to make the part of the insulating member 23 used to accommodate the support member 24 expand and deform in this direction so as to accommodate the support member 24. After the part of the insulating member 23 used to accommodate the support member 24 is restored, it can generate force to fix the support member 24 in this part of the insulating member 23.

[0150] In this way, the support member 24 can be fixed in the first gap more easily, so that the support member 24 is not easy to fall off the insulating member 23, which is beneficial for maintaining the original position and limiting the movement of the electrode assembly 22 when high temperature and high pressure substances are generated inside the battery cell 20, and is beneficial for improving the reliability of the battery cell 20.

[0151] According to some embodiments of the present application, optionally, the support member 24 is interference-fitted with the insulating member 23 at both ends of the extension direction of the main body.

[0152] In a possible implementation, the support member 24 may be interference-fitted with the portion of the insulating member 23 for accommodating the support member 24 in the length direction Y of the first wall 211, and the size of the support member 24 in the length direction Y of the first wall 211 may be slightly larger than the size of the corresponding portion of the insulating member 23 in the length direction Y of the first wall 211. During the assembly process, the size of the corresponding portion of the insulating member 23 in the length direction Y of the first wall 211 may be enlarged by external force, and the support member 24 is placed in the portion, so that the support member 24 can be clamped in the length direction Y of the first wall 211 after the structure of the portion in the length direction Y of the first wall 211 is restored.

[0153] In another possible implementation, the support member 24 may be interference-fitted with the portion of the insulating member 23 for accommodating the support member 24 in the width direction X of the first wall 211, and the size of the support member 24 in the width direction X of the first wall 211 may be slightly larger than the size of the corresponding portion of the insulating member 23 in the width direction X of the first wall 211. During the assembly process, the size of the corresponding portion of the insulating member 23 in the width direction X of the first wall 211 may be enlarged by external force, and the support member 24 may be placed in the portion, and the support member 24 may be clamped in the width direction X of the first wall 211 after the structure of the portion in the width direction X of the first wall 211 is restored.

[0154] In another possible implementation, the support member 24 may be interference fit with the portion of the insulating member 23 for accommodating the support member 24 in the thickness direction Z of the first wall 211. Alternatively, the support member 24 may be interference fit with the portion of the insulating member 23 for accommodating the support member 24 in multiple directions at the same time.

[0155] In this way, the movement of the electrode assembly 22 can be restricted by the larger surface of the support member 24, which is beneficial to improving the restriction effect on the electrode assembly 22. At the same time, this can also make the assembly process simpler.

[0156] According to some embodiments of the present application, optionally, the support member 24 includes a connected support wall 241 and at least one connecting wall 242 , the support wall 241 is used to limit the movement of the electrode assembly 22 toward the first wall 211 , and the connecting wall 242 is used to connect the insulating member 23 and the support wall 241 .

[0157] Figure 8 2 shows a schematic structural diagram of a first wall 211, an insulating member 23 and a supporting member 24. Fig. 9 It is a schematic diagram of the structure of a supporting member 24. Fig.10 is a view of the structure of the first wall 211, the insulating member 23 and the supporting member 24 in the thickness direction Z of the first wall 211, Fig.11 yes Fig.10 The cross-section along the AA direction. Figures 8 to 11 As shown, the support member 24 includes a support wall 241 and at least one connecting wall 242, the support wall 241 is connected to the connecting wall 242, the connecting wall 242 is connected to the insulating member 23, and the connecting wall 242 can connect the support wall 241 to the insulating member 23. Optionally, the support wall 241 can be fixedly connected to the connecting wall 242, the connecting wall 242 is fixedly connected to the insulating member 23, and the connecting wall 242 can fix the support wall 241 to the insulating member 23.

[0158] The support wall 241 is used to limit the movement of the electrode assembly 22 toward the first wall 211, and the connecting wall 242 connects the support wall 241 to the insulating component 23, so that the support wall 241 can remain in its original position and limit the movement of the electrode assembly 22 when the electrode assembly 22 has a tendency to move toward the first wall 211.

[0159] 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 wall 242 may be a wall parallel to the thickness direction Z of the first wall 211, then one end of the connecting wall 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 wall 242 may both be walls perpendicular to the thickness direction Z of the first wall 211, then the support wall 241 and the connecting wall 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.

[0160] The support member 24 is connected to the insulating member 23 via the connecting wall 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 part of the discharge channel for the pressure relief mechanism 213 while limiting the movement of the electrode assembly 22, so that the substances inside the battery cell 20 can reach the pressure relief mechanism 213 via the discharge channel.

[0161] According to some embodiments of the present application, optionally, the connecting wall 242 is snap-fitted to the insulating member 23 .

[0162] Fig.11 The structure shown is a structure in which the support member 24 is clamped with the insulating member 23 through the connecting wall 242. The clamping means that the connecting wall 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.

[0163] In a possible implementation, the toughness of the support member 24 itself can be used to allow at least a portion of the connecting wall 242 to be accommodated in the groove of the insulating member 23 , and the groove can limit the portion of the connecting wall 242 accommodated in the groove after the support member 24 returns to its original shape.

[0164] In another possible embodiment, an avoidance space and a groove may be set on the insulating component 23, and the connecting wall 242 may be moved or rotated from the position of the avoidance space to the position of the groove, and the groove and the connecting wall 242 may limit each other to achieve fixation between the insulating support component 24 and the insulating component 23.

[0165] The above embodiments are only examples, and the clamping method of the connecting wall 242 and the insulating member 23 can be flexibly set according to actual needs.

[0166] The connecting wall 242 and the insulating member 23 can be connected by snapping to easily fix the supporting member 24 and the insulating member 23 , and at the same time can enhance the fixing strength between the two, so that the supporting member 24 is not easy to fall off from the insulating member 23 .

[0167] According to some embodiments of the present application, optionally, the insulating member 23 is provided with a first groove 232 , the opening direction of the first groove 232 is perpendicular to the thickness direction Z of the first wall 211 , and at least a portion of the connecting wall 242 is accommodated in the first groove 232 .

[0168] Fig.12 yes Fig.11 The enlarged structural diagram of part B is shown in FIG. Fig.11 and Fig.12 As shown, the first groove 232 is disposed on the insulating member 23 , and a certain accommodation space is formed on the insulating member 23 . At least a portion of the connecting wall 242 is accommodated in the accommodation space formed by the first groove 232 .

[0169] The opening direction of the first groove 232 is perpendicular to the thickness direction Z of the first wall 211. Fig.11 and Fig.12 It is shown that the opening direction of the first groove 232 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 232 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. Fig.11 and Fig.12 In the illustrated embodiment, the insulating member 23 can limit the movement of the connecting wall 242 in the thickness direction Z of the first wall 211 through the first groove 232 to achieve fixed connection between the connecting wall 242 and the insulating member 23 , thereby achieving fixed connection between the supporting member 24 and the insulating member 23 .

[0170] The first groove 232 can cooperate with the connecting wall 242. For example, the shape of the accommodating space formed by the first groove 232 and the shape of the part of the connecting wall 242 accommodated in the first groove 232 are mutually interlocked, so that the part of the connecting wall 242 accommodated in the first groove 232 is not easy to shake in the first groove 232, which can improve the connection strength between the supporting member 24 and the insulating member 23.

[0171] The first groove 232 can limit the movement of the connecting wall 242 to achieve fixed connection between the supporting member 24 and the insulating member 23 , and can also improve the connection strength between the supporting member 24 and the insulating member 23 , making it difficult for the supporting member 24 to fall off from the insulating member 23 .

[0172] According to some embodiments of the present application, optionally, a protrusion 231 is provided on the surface of the insulating member 23 , and the first groove 232 is provided in the protrusion 231 .

[0173] like Fig.11 and Fig.12 As shown, the position where the first groove 232 is required to be provided on the insulating member 23 can be thickened to increase the size of the accommodation space formed by the first groove 232, and the thickened portion is the protrusion 231 provided on the surface of the insulating member 23. Correspondingly, the portion of the connecting wall 242 accommodated in the first groove 232 can also be appropriately thickened to improve the strength of the connecting wall 242.

[0174] Providing the protrusion 231 on the surface of the insulating member 23 and providing the first groove 232 in the protrusion 231 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 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.

[0175] According to some embodiments of the present application, optionally, a portion of the connecting wall 242 accommodated in the first groove 232 is provided with a first step structure 2423 , the first groove 232 has a second step structure 2321 , and the first step structure 2423 cooperates with the second step structure 2321 .

[0176] like Fig.12 As shown, the first groove 232 and the connecting wall 242 can be matched with each other through a step structure. For example, along the opening direction of the first groove 232, the end of the first groove 232 away from the opening is narrower, and the end close to the opening is wider.

[0177] In some embodiments, the first groove 232 may be interference-fitted with the connecting wall 242 to improve the connection strength between the insulating member 23 and the connecting wall 242. For example, the first groove 232 and the connecting wall 242 may be interference-fitted in the thickness direction Z of the first wall 211.

[0178] During the assembly process, the narrower part of the first step structure 2423 first passes through the wider part of the second step structure 2321, and then extends into the narrower part of the second step structure 2321. The cooperation between the first step structure 2423 and the second step structure 2321 is conducive to guiding the connecting wall 242 to be accommodated in the first groove 232, thereby reducing the positioning accuracy during the assembly process.

[0179] According to some embodiments of the present application, optionally, the connection wall 242 is connected to a surface of the insulating member 23 facing the electrode assembly 22 .

[0180] In some embodiments, the connecting wall 242 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 electrode assembly 22 in the thickness direction Z of the first wall 211; optionally, it can be connected to the surface of the insulating member 23 facing away from the electrode assembly 22 in the thickness direction Z of the first wall 211; optionally, it can be connected to the surface of the insulating member 23 parallel to the thickness direction Z of the first wall 211.

[0181] Figure 8 What is shown is the situation where the connecting wall 242 is connected to the surface of the insulating member 23 facing the electrode assembly 22. In this case, the supporting 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 keeping the discharge channel unobstructed.

[0182] 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 wall 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 keeping the discharge channel unobstructed.

[0183] According to some embodiments of the present application, optionally, the connecting wall 242 includes at least one first connecting portion 2421 parallel to the thickness direction Z of the first wall 211 , and the first connecting portion 2421 is used to form a gap between the insulating member 23 and the supporting wall 241 .

[0184] Fig. 9 A possible structure of the support member 24 is shown. Fig. 9As shown, the first connection portion 2421 may be a portion of the connection wall 242 parallel to the thickness direction Z of the first wall 211. The first connection portion 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. There is a certain gap between the support wall 241 and the insulating member 23, and the distance between the two is the size of the first connection portion 2421 in the thickness direction Z of the first wall 211.

[0185] While limiting the movement of the electrode assembly 22, the gap formed by the first connecting portion 2421 can maintain a certain discharge channel in the area surrounding the pressure relief mechanism 213, so that high-temperature and high-pressure materials can reach the pressure relief mechanism 213 along the discharge channel, thereby actuating the pressure relief mechanism 213 to discharge a large amount of high-temperature and high-pressure materials generated inside the battery cell 20 due to thermal runaway.

[0186] According to some embodiments of the present application, optionally, the connecting wall 242 includes a second connecting portion 2422 , and the first connecting portion 2421 is connected to the second connecting portion 2422 .

[0187] like Fig. 9 As shown, the connecting wall 242 may include a first connecting portion 2421 and a second connecting portion 2422 connected to each other. In some embodiments, the plane where the first connecting portion 2421 is located and the plane where the second connecting portion 2422 is located may be perpendicular to each other. Optionally, the plane where the first connecting portion 2421 is located and the plane where the second connecting portion 2422 is located may have a certain angle, which may be an acute angle or an obtuse angle.

[0188] In some embodiments, the second connection portion 2422 may be fixedly connected to the surface of the insulating member 23 facing the electrode assembly 22 , and the support member 24 may be fixedly connected to the insulating member 23 via the second connection portion 2422 of the connecting wall 242 .

[0189] The second connecting portion 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.

[0190] According to some embodiments of the present application, optionally, the at least one first connection portion 2421 includes two first connection portions 2421 , and the two first connection portions 2421 are arranged opposite to each other at the edge of the supporting wall 241 .

[0191] exist Fig. 9In the illustrated embodiment, the support member 24 may include two first connection portions 2421, which are respectively disposed 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 connection portion 2421. One end of the first connection portion 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 connection portion 2422 or the insulating member 23. In some embodiments, the plane where the second connection portion 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.

[0192] Optionally, the two first connection portions 2421 may also be disposed at two ends of the support wall 241 along the length direction Y of the first wall 211 .

[0193] The first connecting parts 2421 arranged opposite to each other can make the connection between the support 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 conducive to better restricting the movement of the electrode assembly 22. At the same time, the interval between the two first connecting parts 2421 can be used as a channel for high-temperature and high-pressure substances to pass through, which is conducive to the high-temperature and high-pressure substances generated by thermal runaway to flow to the pressure relief mechanism 23, and then discharged to the outside of the battery cell 20 through the pressure relief mechanism 23.

[0194] According to some embodiments of the present application, optionally, the first connection portion 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 .

[0195] like Fig. 9 As shown, the first connection part 2421 may have a through hole 246 that penetrates the first connection part 2421 in the thickness direction Z of the first connection part 2421. For example, in the width direction X of the first wall 211, the first connection part 2421 is provided at both ends of the support wall 241, and the through hole 246 may penetrate the first connection part 2421 in the width direction X of the first wall 211. The through hole 246 can form a channel connecting the two sides of the first connection part 2421 in the through direction, thereby connecting the pressure relief mechanism 213 and the electrode assembly 22.

[0196] 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 discharge the high-temperature and high-pressure material, so as to reduce the possibility of more serious explosion accidents, thereby improving the reliability of the battery cell 20.

[0197] 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 .

[0198] In a possible implementation, the support member 24 may be disposed near 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.

[0199] 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.

[0200] According to some embodiments of the present application, optionally, the first wall 211 is provided with a pressure relief mechanism 213 , and the support member 24 is arranged opposite to the pressure relief mechanism 213 .

[0201] exist Figure 8 In the illustrated structure, the support member 24 and the pressure relief mechanism 213 are arranged opposite to each other in the thickness direction Z of the first wall 211 .

[0202] The support member 24 is located on the side of the pressure relief mechanism 213 facing the electrode assembly 22 along the thickness direction Z of the first wall 211, and at least a portion of the support member 24 has a certain gap with the pressure relief mechanism 213 in the thickness direction Z of the first wall 211. Specifically, in some embodiments, the insulating member 23 includes a first insulating wall, which is arranged on the side of the pressure relief mechanism 213 facing the electrode assembly 22 in the thickness direction Z of the first wall 211, and has a certain gap with the pressure relief mechanism 213 in the thickness direction Z of the first wall 211, and the support member 24 is arranged on the surface of the first wall 211 facing the electrode assembly 22, and the support member 24 and the pressure relief mechanism 213 also have a certain gap. Optionally, the first insulating wall is arranged on the side of the pressure relief mechanism 213 facing the electrode assembly 22, the support member 24 is arranged on the surface of the first insulating wall facing the electrode assembly 22, and at least a portion of the support member 24 has a certain gap with the first insulating wall, and at least a portion of the support member 24 also has a certain gap with the pressure relief mechanism 213.

[0203] The support member 24 and the pressure relief mechanism 213 are arranged relative to each other to provide protection for the pressure relief mechanism 213. When the electrode assembly 22 moves toward the pressure relief mechanism 213 driven by the high-temperature and high-pressure substances generated by thermal runaway, the electrode assembly 22 can be restricted from continuing to move at a position relative to the pressure relief mechanism 213, so that a certain gap is maintained between the electrode assembly 22 and the pressure relief mechanism 213 as much as possible, thereby reducing the possibility of the discharge channel or the pressure relief structure being blocked by the electrode assembly 22, which is beneficial to the actuation of the pressure relief mechanism 213 to quickly discharge the high-temperature and high-pressure substances inside the battery cell 20, thereby improving the reliability of the battery cell 20.

[0204] According to some embodiments of the present application, optionally, a pressure relief mechanism 213 is provided on the first wall 211 , and the insulating member 23 has a discharge channel connecting the pressure relief mechanism 213 and the electrode assembly 22 .

[0205] The discharge channel may be formed by the space inside the battery cell 20, the through hole on the insulating member 23, the through hole on the supporting member 24, and other structures, and refers to the path for the high-temperature and high-pressure material to reach the pressure relief mechanism 213 from the inside of the battery cell 20 when the high-temperature and high-pressure material is generated inside the battery cell 20. In some embodiments, the high-temperature and high-pressure material may be generated in the area where the electrode assembly 22 is located, and the discharge channel may also refer to a structure for connecting the area where the electrode assembly 22 is located inside the battery cell 20 with the area where the pressure relief mechanism 213 is located.

[0206] The discharge channel can guide the high-temperature and high-pressure substances inside the battery cell 20 to flow to the area of ​​the pressure relief mechanism 213, which is conducive to the timely actuation of the pressure relief mechanism 213 and reduces the possibility of explosion caused by the high-temperature and high-pressure substances inside the battery cell 20.

[0207] According to some embodiments of the present application, optionally, the insulating member 23 includes a side wall 233, which is parallel to the thickness direction Z of the first wall 211, and is provided with a discharge hole 234 that penetrates the side wall 233 in the thickness direction Z of the side wall 233, and the discharge hole 234 is used to form a discharge channel.

[0208] like Figures 4 to 8 As shown, the side wall 233 is a structure on the insulating member 23 parallel to the thickness direction Z of the first wall 211, and the discharge hole 234 penetrates the side wall 233 in the thickness direction Z of the side wall 233. The high-temperature and high-pressure substances generated inside the battery cell 20 can pass through the discharge hole 234, especially when the side wall 233 is arranged in the surrounding area of ​​the pressure relief mechanism 213, the discharge hole 234 is conducive to guiding the high-temperature and high-pressure substances to flow to the position where the pressure relief mechanism 213 is located, so as to actuate the pressure relief mechanism 213.

[0209] In a possible implementation manner, the side wall 233 of the insulating member 23 extending along the thickness direction Z of the first wall 211 and the width direction X of the first wall 211 is provided with a discharge hole 234, such as Figures 4 to 8 Optionally, the side wall 233 of the insulating member 23 extending along the thickness direction Z of the first wall 211 and the length direction Y of the first wall 211 may also be provided with a discharge hole 234 .

[0210] The discharge hole 234 on the side wall 233 can form a discharge channel inside the battery cell 20, guiding the high-temperature and high-pressure material to flow toward the pressure relief mechanism 213, which is beneficial to the actuation of the pressure relief structure to quickly discharge the high-temperature and high-pressure material inside the battery cell 20, thereby improving the reliability of the battery cell 20.

[0211] According to some embodiments of the present application, optionally, the insulating member 23 includes a main body wall 235 , which is perpendicular to the thickness direction Z of the first wall 211 and connected to the side wall 233 .

[0212] like Figures 4 to 8 As shown, the main body wall 235 may include a single layer of walls or multiple layers of walls, and the side wall 233 may connect two layers of walls arranged along the thickness direction Z of the first wall 211. The main body wall 235 and the side wall 233 may enclose a certain space, and in the case where the discharge hole 234 is provided on the side wall 233, the discharge hole 234 and the space may be used together to form a discharge channel.

[0213] The main wall 235 can play an insulating role in a larger range and provide space for the setting of the support member 24 . It can protect the pressure relief mechanism 213 and form a discharge channel to guide high-temperature and high-pressure substances to flow toward the pressure relief mechanism 213 .

[0214] According to some embodiments of the present application, optionally, the side wall 233 includes a first side portion 2331, the first side portion 2331 is arranged on both sides of the pressure relief mechanism 213 in the length direction Y of the first wall 211, and the discharge hole 234 includes a first through hole 2341, the first through hole 2341 penetrates the first side portion 2331 in the length direction Y of the first wall 211, and the first through hole 2341 is used to form a discharge channel.

[0215] The first side portion 2331 refers to the portion of the side wall 233 disposed on both sides of the pressure relief mechanism 213 in the length direction Y of the first wall 211. In some embodiments, the pressure relief mechanism 213 may be disposed in the middle area of ​​the first wall 211, and the first side portion 2331 may correspond to the position of the pressure relief mechanism 213 and be disposed in the middle area of ​​the insulating member 23.

[0216] The first through hole 2341 refers to the discharge hole 234 arranged on the first side portion 2331 in the discharge hole 234. The first through hole 2341 penetrates the first side portion 2331 in the length direction Y of the first wall 211. The first side portion 2331 is arranged along the length direction Y of the first wall 211. The first through hole 2341 can connect the area where the pressure relief mechanism 213 is located with the area where the electrode assembly 22 is located, forming at least a part of the discharge channel.

[0217] The first side portion 2331 and the first through hole 2341 can form a discharge channel in the surrounding area of ​​the pressure relief mechanism 213, which is beneficial for guiding the high-temperature and high-pressure substances generated by thermal runaway to flow to the area of ​​the pressure relief mechanism 213 when thermal runaway occurs inside the battery cell 20, so that the pressure relief mechanism 213 can be actuated in time, thereby improving the reliability of the battery cell 20.

[0218] According to some embodiments of the present application, optionally, the insulating member 23 has a second through hole 236 that penetrates the insulating member 23 in the thickness direction Z of the first wall 211 , and the second through hole 236 is arranged opposite to the pressure relief mechanism 213 , and the second through hole 236 is used to form a discharge channel.

[0219] like Figures 4 to 8 As shown, the second through hole 236 penetrates the insulating member 23 in the thickness direction Z of the first wall 211. In a possible embodiment, the insulating member 23 includes a main body wall 235, and the second through hole 236 can penetrate the main body wall 235 in the thickness direction Z of the first wall 211. The second through hole 236 is arranged opposite to the pressure relief mechanism 213, and the second through hole 236 can connect the area where the pressure relief mechanism 213 is located with the area of ​​the electrode assembly 22 at a position opposite to the pressure relief mechanism 213, thereby forming at least a part of the discharge channel.

[0220] The second through hole 236 can more directly connect the pressure relief mechanism 213 and the electrode assembly 22 , so that the high-temperature and high-pressure material inside the battery cell 20 can flow to the pressure relief mechanism 213 more quickly, so that the pressure relief mechanism 213 can be actuated in time, thereby improving the reliability of the battery cell 20 .

[0221] According to some embodiments of the present application, optionally, the support member 24 is provided with a third through hole 247 , and the third through hole 247 is used to form a discharge channel.

[0222] The third through hole 247 may communicate with the space inside the battery cell 20 to form a discharge channel. For example, it may communicate with the gap or space in the area where the insulating member 23 is located, optionally, it may communicate with the electrode assembly 22 and the area where it is located, and optionally, it may communicate with the pressure relief mechanism 213 and the area where it is located.

[0223] In a possible embodiment, the third through hole 247 may penetrate the support member 24 along a certain direction. For example, when the support member 24 extends along the width direction X of the first wall 211, the third through hole 247 may penetrate the support member 24 along the length direction Y of the first wall 211; alternatively, when the support member 24 extends along the length direction Y of the first wall 211, the third through hole 247 may penetrate the support member 24 along the width direction X of the first wall 211. In another possible embodiment, the third through hole 247 may form channels on the support member 24 from two intersecting directions. For example, the openings of the third through hole 247 on the surface of the support member 24 may be respectively located on the intersecting surfaces of the support member 24, and these openings are interconnected inside the support member 24.

[0224] In a possible implementation, the third through hole 247 may be disposed opposite to the through hole disposed on the insulating member 23, and specifically, may be communicated with the through hole on the insulating member 23, and together form at least a portion of the discharge channel. For example, the third through hole 247 may be communicated with the discharge hole 234, specifically, may be communicated with the discharge hole 234 disposed at the edge of the insulating member 23; alternatively, the third through hole 247 may be communicated with the first through hole 2341; alternatively, the third through hole 247 may be communicated with the second through hole 236.

[0225] The third through hole 247 penetrates the support member 24 to form at least a portion of the discharge channel, and the high-temperature and high-pressure substances inside the battery cell 20 can pass through the third through hole 247. In some embodiments, the high-temperature and high-pressure substances inside the battery cell 20 can be guided to flow in a certain direction by designing the path of the third through hole 247.

[0226] The third through hole 247 can provide a path for the high-temperature and high-pressure substance to flow inside the battery cell 20 , which is beneficial to the discharge of the high-temperature and high-pressure substance, so that the pressure relief mechanism 213 can be actuated in time, thereby improving the reliability of the battery cell 20 .

[0227] According to some embodiments of the present application, optionally, the surface of the support member 24 facing the electrode assembly 22 in the thickness direction Z of the first wall 211 and / or the surface of the support member 24 facing the first wall 211 in the thickness direction Z of the first wall 211 has an insulating layer.

[0228] Specifically, in some embodiments, an insulating layer may be provided on the surface of the support member 24 facing the first wall 211 to reduce the possibility that the support member 24 contacts the first wall 211 and causes the first wall 211 to be charged.

[0229] In some embodiments, a surface of the support member 24 facing the electrode assembly 22 is provided with an insulating layer to reduce the possibility that the support member 24 conducts the electrical energy generated by the electrode assembly 22 to the first wall 211 .

[0230] In some embodiments, the surfaces of the support member 24 facing the first wall 211 and the electrode assembly 22 may be provided with an insulating layer at the same time, or the surfaces of the support member 24 may be coated with an insulating material to improve the insulating effect of the support member 24 .

[0231] In some embodiments, the support member 24 may be made of an insulating material, for example, may be made of high temperature resistant ceramics.

[0232] The insulating layer can improve the insulation performance between the support member 24 and the first wall 211 , and reduce the possibility that the housing 21 of the battery cell 20 is charged by the support member 24 , thereby improving the reliability of the battery cell 20 .

[0233] Fig.13 It shows a simplified structural diagram of the discharge path of high-temperature and high-pressure substances generated by thermal runaway and the support member 24 limiting the deformation of the electrode assembly 22 when thermal runaway occurs inside the battery cell 20 .

[0234] like Fig.13 As shown in , when the high-temperature and high-pressure substances generated inside the battery cell 20 are small, the high-temperature and high-pressure substances can be gathered near the pressure relief mechanism 213 through the discharge channel inside the battery cell 20, so that the pressure relief mechanism 213 is actuated to discharge the high-temperature and high-pressure substances inside the battery cell 20.

[0235] like Fig.13 As shown in , when the battery cell 20 is not provided with a support member 24 and 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, and the insulating member 23 is easily melted and softened under the action of the high-temperature substances. The electrode assembly 22 may further move toward the pressure relief mechanism 213 and cause the melted and softened insulating member 23 to deform, causing the electrode assembly 22 to block the pressure relief mechanism 213, making the pressure relief mechanism 213 unable to actuate normally, and the high-temperature and high-pressure substances accumulate inside the battery cell 20, which may easily cause an explosion.

[0236] Fig.13 The battery cell 20 is provided with Figure 4 and Figure 5In the case of the support member 24 shown in the figure, the support member 24 can limit the movement of the electrode assembly 22 when the electrode assembly 22 moves toward the pressure relief mechanism 213, so that the electrode assembly 22 can maintain a certain distance from the pressure relief mechanism 213 as much as possible, thereby maintaining the unobstructed discharge channel. Specifically, the support member 24 can be provided at the edge of the insulating member 23 along the length direction Y and / or the width direction X of the first wall 211, and the support member 24 can limit the movement of the electrode assembly 22 at the edge along the length direction Y and / or the width direction X of the first wall 211, thereby reducing the distance that the electrode assembly 22 moves toward the pressure relief mechanism 213.

[0237] Fig.13 The battery cell 20 is provided with Figures 8 to 12 In the case of the support member 24 shown in the figure, similarly, the support member 24 can limit the movement of the electrode assembly 22 when the electrode assembly 22 moves toward the pressure relief mechanism 213, so that the electrode assembly 22 is kept at a certain distance from the pressure relief mechanism 213 as much as possible, thereby keeping the discharge channel unobstructed. Specifically, the support member 24 can be arranged relative to the pressure relief mechanism 213 in the thickness direction Z of the first wall 211, and the support member 24 can directly limit the movement of the electrode assembly 22 toward the pressure relief mechanism 213 at the corresponding position, so that the electrode assembly 22 is kept at a certain distance from the pressure relief structure as much as possible, thereby keeping the discharge channel unobstructed.

[0238] 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.

[0239] The embodiment of the present application provides a battery cell 20, including a shell 21, an electrode assembly 22, an insulating member 23 and a support member 24. An electrode terminal 214 is arranged on a first wall 211 of the shell 21, and is electrically connected to the electrode assembly 22 accommodated in the shell 21 through a connecting member 25. An insulating member 23 is arranged between the first wall 211 and the electrode assembly 22, and a support member 24 is arranged between the insulating member 23 and the electrode assembly 22. The melting point of the support member 24 can be higher than the melting point of the insulating member 23. In the event of thermal runaway inside the battery cell 20, the support member 24 is not easy to melt under the action of high-temperature and high-pressure substances, nor is it easy to be deformed by the extrusion of the electrode assembly 22. The deformation of the electrode assembly 22 can be limited at the position where the support member 24 is located, so that the electrode assembly 22 is not easy to block the discharge channel inside the battery cell 20, so that the pressure relief mechanism 213 can be normally actuated to discharge the high-temperature and high-pressure substances, thereby improving the reliability of the battery cell 20.

[0240] 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 (21), wherein the housing (21) has a first wall (211); an electrode assembly (22), the electrode assembly (22) being accommodated in the housing (21); an insulating member (23), the insulating member (23) being disposed between the electrode assembly (22) and the first wall (211); A support member (24) is disposed between the insulating member (23) and the electrode assembly (22), and is used to limit the movement of the electrode assembly (22) toward the first wall.

2. The battery cell according to claim 1, characterized in that: The supporting member (24) has a melting point higher than that of the insulating member (23).

3. The battery cell according to claim 2, characterized in that: The melting point of the supporting member (24) is greater than 100°C.

4. The battery cell according to any one of claims 1 to 3, characterized in that: The supporting member (24) is arranged along the edge of the insulating member (23).

5. The battery cell according to claim 4, characterized in that: The supporting member is located at an edge of the insulating member (23) in the width direction (Y) of the first wall (211).

6. The battery cell according to claim 5, characterized in that: The support members (24) are arranged at intervals along the length direction of the first wall (211).

7. The battery cell according to any one of claims 4 to 6, characterized in that: The supporting member (24) is located at an edge of the insulating member (23) in the length direction of the first wall (211).

8. The battery cell according to any one of claims 1 to 7, characterized in that: A pressure relief mechanism (213) is provided on the first wall (211), and the support member (24) is arranged along the circumference of the pressure relief mechanism (213).

9. The battery cell according to claim 8, characterized in that: The plurality of support members (24) are continuously arranged along the circumference of the pressure relief mechanism (213); the plurality of support members (24) enclose a receiving space, and the pressure relief mechanism (213) is arranged in the receiving space.

10. The battery cell according to any one of claims 1 to 9, characterized in that: The supporting member (24) comprises a long strip-shaped main body.

11. The battery cell according to claim 10, characterized in that: The supporting member (24) and the insulating member (23) are interference fit.

12. The battery cell according to claim 11, characterized in that: The supporting member (24) is interference-fitted with the insulating member (23) at both ends of the main body in the extending direction.

13. The battery cell according to any one of claims 1 to 12, characterized in that: The support member (24) comprises a connected support wall (241) and at least one connecting wall (242), wherein the support wall (241) is used to limit the movement of the electrode assembly (22) toward the first wall (211), and the connecting wall (242) is used to connect the insulating member (23) and the support wall (241).

14. The battery cell according to claim 13, characterized in that: The connecting wall (242) is snap-connected with the insulating component (23).

15. The battery cell according to claim 14, characterized in that: The insulating member (23) is provided with a first groove (232), the opening direction of the first groove (232) is perpendicular to the thickness direction of the first wall (211), and at least a part of the connecting wall (242) is accommodated in the first groove (232).

16. The battery cell according to claim 15, characterized in that: A protrusion (231) is provided on the surface of the insulating component (23), and the first groove (232) is provided in the protrusion (231).

17. The battery cell according to claim 15 or 16, characterized in that: The portion of the connecting wall (242) accommodated in the first groove (232) is provided with a first step structure (2423), the first groove (232) has a second step structure, and the first step structure (2423) cooperates with the second step structure (2321).

18. The battery cell according to claim 13, characterized in that: The connection wall (242) is connected to a surface of the insulating member (23) facing the electrode assembly (22).

19. The battery cell according to any one of claims 13 to 18, characterized in that: The connecting wall (242) includes at least one first connecting portion (2421) parallel to the thickness direction (Z) of the first wall (211), and the first connecting portion (2421) is used to form a gap between the insulating member (23) and the supporting wall (241).

20. The battery cell according to any one of claims 13 to 19, characterized in that: The connecting wall (242) includes a second connecting portion (2422), and the first connecting portion (2421) is connected to the second connecting portion (2422).

21. The battery cell according to claim 19 or 20, characterized in that: At least one of the first connection parts (2421) includes two first connection parts (2421), and the two first connection parts (2421) are arranged opposite to each other at the edge of the supporting wall (241).

22. The battery cell according to any one of claims 13 to 21, characterized in that: The first connecting portion (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).

23. The battery cell according to any one of claims 13 to 22, characterized in that: The projection of the support wall (241) in the thickness direction (Z) of the first wall (211) covers the projection of the pressure relief mechanism (213) in the thickness direction (Z) of the first wall (211).

24. The battery cell according to any one of claims 13 to 23, characterized in that: The first wall (211) is provided with a pressure relief mechanism (213), and the support member (24) is arranged opposite to the pressure relief mechanism (213).

25. The battery cell according to any one of claims 1 to 24, characterized in that: A pressure relief mechanism (213) is provided on the first wall (211), and the insulating component (23) has a discharge channel connecting the pressure relief mechanism (213) and the electrode assembly (22).

26. The battery cell according to claim 25, characterized in that: The insulating member (23) includes a side wall (233), the side wall (233) is parallel to the thickness direction (Z) of the first wall (211), and the side wall (233) is provided with a discharge hole (234) penetrating the side wall (233) in the thickness direction of the side wall (233), and the discharge hole (234) is used to form the discharge channel.

27. The battery cell according to claim 26, characterized in that: The insulating member (23) includes a main body wall (235) which is perpendicular to the thickness direction (Z) of the first wall (211) and connected to the side wall (233).

28. The battery cell according to claim 26 or 27, characterized in that: The side wall (233) includes a first side portion (2331), and the first side portion (2331) is arranged on both sides of the pressure relief mechanism (213) in the length direction (Y) of the first wall (211); the discharge hole (234) includes a first through hole (2341), and the first through hole (2341) penetrates the first side portion (2331) in the length direction (Y) of the first wall (211); the first through hole (2341) is used to form the discharge channel.

29. The battery cell according to any one of claims 25 to 28, characterized in that: The insulating member (23) has a second through hole (236) penetrating the insulating member (23) in the thickness direction of the first wall (211), the second through hole (236) being arranged opposite to the pressure relief mechanism (213), and the second through hole (236) being used to form the discharge channel.

30. The battery cell according to claims 25 to 29, characterized in that: The supporting member (24) is provided with a third through hole (247), and the third through hole (247) is used to form the discharge passage.

31. The battery cell according to any one of claims 1 to 30, characterized in that: The surface of the support member (24) facing the electrode assembly (22) in the thickness direction (Z) of the first wall (211) and / or the surface of the support member (24) facing the first wall (211) in the thickness direction (Z) of the first wall (211) has an insulating layer.

32. A battery, characterized in that: include: A battery cell as claimed in any one of claims 1 to 31.

33. An electrical device, characterized in that: Comprising the battery as described in claim 32, the battery is used to provide electrical energy to the electrical device.

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