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 monomer comprises a shell, the shell is provided with a first wall, and the first wall is provided with a pressure relief mechanism; an electrode assembly, wherein the electrode assembly is accommodated in the shell; the insulating component is arranged between the electrode assembly and the first wall, the insulating component is provided with an accommodating cavity, and the insulating component is provided with a discharge channel which is communicated with the pressure relief mechanism and the electrode assembly; and the supporting component is contained in the containing cavity and used for limiting deformation of the discharging channel.

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, on which a pressure relief mechanism is provided; an electrode assembly, which is accommodated in the shell; an insulating member, which is arranged between the electrode assembly and the first wall, and has a accommodating cavity, and has a discharge channel connecting the pressure relief mechanism and the electrode assembly; and a supporting member, which is accommodated in the accommodating cavity and is used to limit deformation of the discharge channel.

[0006] The battery cell provided in the embodiment of the present application can limit the deformation of the discharge channel through the support member when thermal runaway occurs inside the battery cell, thereby 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.

[0007] In some embodiments, the insulating member includes a first insulating wall, and the accommodating cavity is formed between the first insulating wall and the first wall.

[0008] The first insulating wall can provide support for the support member, reduce the possibility of the support member falling from the accommodating cavity, and help maintain the position of the support member relative to the insulating member, thereby improving the effect of the support member in limiting the deformation of the exhaust channel.

[0009] In some embodiments, a projection of the first insulating wall in the thickness direction of the first wall covers a projection of the supporting member in the thickness direction of the first wall.

[0010] This can ensure better insulation performance between the electrode assembly and the first wall, reduce the possibility of the first wall being charged due to contact between the electrode assembly and the support member, or between the support member and the first wall, and help improve the reliability of the battery cell.

[0011] In some embodiments, the insulating component includes a second insulating wall, which is disposed between the first insulating wall and the first wall and forms the accommodating cavity with the first insulating wall.

[0012] The second insulating wall can isolate the support member from the first wall, thereby improving the insulation performance between the support member and the first wall. At the same time, the accommodation cavity formed by the second insulating wall and the first insulating wall can provide a more stable accommodation space for the support member, so that the support member is not easy to fall during the assembly process.

[0013] In some embodiments, the insulating member includes a second insulating wall, which is arranged on the surface of the insulating member facing the first wall in the thickness direction of the first wall, and the accommodating cavity is formed between the second insulating wall and the surface of the insulating member facing the electrode assembly in the thickness direction of the first wall.

[0014] The second insulating wall can separate the support member from the first wall, and play an insulating role between the support member and the first wall, so that the first wall is not easily charged, thereby improving the reliability of the battery cell.

[0015] In some embodiments, the insulating component includes a connecting wall, the connecting wall connects the first insulating wall and the second insulating wall, and the connecting wall extends along the first direction.

[0016] The connecting wall can improve the anti-deformation strength of the insulating component in the thickness direction of the first wall, and provide support for the supporting component accommodated in the accommodating cavity, so that the supporting component is not easy to fall.

[0017] In some embodiments, the connecting wall is provided with a discharge hole penetrating the connecting wall in a thickness direction of the connecting wall.

[0018] The discharge hole on the connecting wall can form a discharge channel together with the accommodating cavity to guide the high-temperature and high-pressure material to flow toward the pressure relief mechanism, which is conducive to the actuation of the pressure relief structure to quickly discharge the high-temperature and high-pressure material inside the battery cell, thereby improving the reliability of the battery cell.

[0019] In some embodiments, the connecting wall includes a first connecting portion, which 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, which penetrates the first connecting portion in the length direction of the first wall, and the first through hole is used to form the discharge channel.

[0020] The first connecting 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.

[0021] 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.

[0022] 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.

[0023] In some embodiments, the support member is disposed at an edge of the insulating member on a plane perpendicular to a thickness direction of the first wall.

[0024] The support member is arranged at the edge of the insulating member so as not to interfere with other members in the battery cell, which is beneficial to improving the qualified rate of the battery cell.

[0025] In some embodiments, the support member is located at an edge of the insulating member in a width direction of the first wall.

[0026] 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, thereby limiting the deformation of the exhaust passage.

[0027] In some embodiments, the support members are spaced apart along the length direction of the first wall.

[0028] This can reduce the overall weight of the battery cell while limiting deformation of the exhaust passage.

[0029] In some embodiments, the supporting member is located at an edge of the insulating member in the length direction of the first wall.

[0030] The support member is arranged on the wide side of the insulating member to limit the deformation of the insulating member at the corresponding position of the insulating member, and at the same time limit the movement of the electrode assembly toward the pressure relief mechanism to a certain extent, reduce the probability of the electrode assembly blocking the pressure relief mechanism, and keep the discharge channel unobstructed.

[0031] In some embodiments, the support member is disposed in a surrounding area of ​​the pressure relief mechanism.

[0032] The support member is arranged in the surrounding area of ​​the pressure relief mechanism, which can more directly limit the electrode assembly near 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. 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.

[0033] In some embodiments, a plurality of the support members enclose a surrounding area of ​​the pressure relief mechanism to form a receiving space, and the pressure relief mechanism is disposed in the receiving space.

[0034] The multiple support members disposed around the pressure relief mechanism can further limit the deformation of the structure around the pressure relief mechanism and keep the discharge channel in the area around the pressure relief mechanism unobstructed.

[0035] 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.

[0036] 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.

[0037] In some embodiments, the supporting member includes an elongated main body.

[0038] 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.

[0039] In some embodiments, the melting point of the support member is higher than the melting point of the insulating member.

[0040] In the same temperature environment, the supporting member is less likely to melt or dissolve than the insulating member, and can maintain its original shape and position in the accommodating cavity, thereby supporting the electrode assembly moving toward the pressure relief mechanism, making it difficult for the electrode assembly to move to a position that blocks the discharge channel, thereby limiting the deformation of the discharge channel, and providing a discharge channel for high-temperature and high-pressure materials to reach the pressure relief mechanism, which is beneficial to improving the reliability of the battery cell.

[0041] In some embodiments, the melting point of the support member is greater than 100°C.

[0042] This is beneficial in that when the battery cell experiences thermal runaway, it is not easily melted, and an exhaust channel connected to the pressure relief mechanism can be formed between the first wall and the electrode assembly, so that the thermal runaway gas can be discharged to the outside of the battery cell through the pressure relief mechanism in time, which is beneficial to improving the reliability of the battery cell.

[0043] In some embodiments, the first wall is provided with an electrode terminal, the battery cell comprises: a connecting member for electrically connecting the electrode terminal and the electrode assembly, the insulating member having a avoidance hole penetrating the insulating member in the first direction, at least a portion of the connecting member being accommodated in the avoidance hole.

[0044] The avoidance hole can provide space for the connecting member to electrically connect the electrode terminal and the electrode assembly, so that the electric energy generated in the electrode assembly can be led out of the battery cell to provide electric energy to the electric device.

[0045] In some embodiments, the support member is interference fit with the accommodating cavity.

[0046] In this way, the support member can be fixed in the accommodating cavity more easily, so that the support member is not easy to fall out of the accommodating cavity, which is beneficial to keep the discharge channel unobstructed when high-temperature and high-pressure substances are generated inside the battery cell, and is beneficial to improving the reliability of the battery cell.

[0047] 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.

[0048] 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.

[0049] In a second aspect, a battery is provided, comprising: a battery cell as described in any embodiment of the first aspect.

[0050] In a third aspect, an electrical device is provided, comprising a battery as described in any embodiment of the second aspect, wherein the battery is used to provide electrical energy to the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] 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.

[0052] Figure 1It is a structural schematic diagram of a vehicle provided in an embodiment of the present application.

[0053] Figure 2 It is a schematic diagram of the structure of a battery provided in an embodiment of the present application.

[0054] Figure 3 It is a schematic diagram of the exploded structure of a battery cell provided in an embodiment of the present application.

[0055] Figure 4 It is a schematic diagram of the exploded structure of a first wall, an insulating component and a supporting component provided in an embodiment of the present application.

[0056] Figure 5 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.

[0057] Figure 6 This is a simplified structural diagram of a discharge path provided in an embodiment of the present application.

[0058] 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.

[0059] Figure 8 yes Figure 7 A view of the structure along the thickness direction of the first wall.

[0060] Fig. 9 yes Figure 8 A cross-sectional view of the structure along the AA direction.

[0061] Fig.10 yes Figure 8 Another cross-sectional view of the structure along the AA direction.

[0062] Fig.11 is with Fig.10 The structure shown corresponds to an axonometric view.

[0063] Fig.12 yes Figure 8 Another cross-sectional view of the structure along the AA direction.

[0064] Fig.13 yes Figure 7 A schematic diagram of the decomposition structure of the structure in .

[0065] Fig.14 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.

[0066] Fig.15 yes Fig.14 A schematic diagram of the decomposition structure of the structure in .

[0067] Fig.16 It is a schematic diagram of the decomposed structure of another first wall, insulating component and supporting component provided in an embodiment of the present application.

[0068] Fig.17 It is a schematic diagram of the decomposed structure of another first wall, insulating component and supporting component provided in an embodiment of the present application.

[0069] In the drawings, the drawings are not drawn to scale. DETAILED DESCRIPTION

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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).

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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 gap between the electrode assembly and the shell, or the discharge channel formed by the through holes set in other structures, 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 cells. 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 cells used to form exhaust channels may also melt in a high-temperature environment, further reducing the amount of emissions, resulting in the battery cells being unable to quickly discharge high-temperature and high-pressure substances, making the battery cells prone to cracking and reducing the reliability of the battery cells.

[0080] In view of this, an embodiment of the present application provides a battery cell, in which a support member is provided in the insulating member of the battery cell. Even if the electrode assembly moves toward the direction of the pressure relief mechanism under the drive of the high-temperature and high-pressure material, the support member can limit the deformation of the insulating member and reduce the movement distance of the electrode assembly, making it difficult for the electrode assembly to move to a position that blocks the pressure relief mechanism, thereby maintaining the patency of the discharge channel, which is beneficial to increasing the discharge speed of the high-temperature and high-pressure material inside the battery cell and improving the reliability of the battery cell.

[0081] 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.

[0082] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0083] like Figure 1 As shown, it is a structural schematic diagram of a vehicle 1 according to an embodiment of the present application. The vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A motor 90, a controller 80 and a battery 10 may be arranged inside the vehicle 1. The controller 80 is used to control the battery 10 to supply power to the motor 90. For example, a battery 10 may be arranged at the bottom, front or rear of the vehicle 1. The battery 10 may be used to supply power to the vehicle 1. For example, the battery 10 may be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, for the working power requirements during the start-up, navigation and operation of the vehicle 1. In another embodiment of the present application, the battery 10 may not only be used as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0084] 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.

[0085] 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.

[0086] For example, unlike Figure 2 As shown, only one of the first part 111 and the second part 112 may be a hollow cuboid with an opening, while the other may be in the shape of a plate to cover the opening. For example, here, the second part 112 is a hollow cuboid with only one face as an opening face, and the first part 111 is in the shape of a plate. Then, the first part 111 covers the opening of the second part 112 to form a box 11 with a closed chamber, which can be used to accommodate multiple battery cells 20. Multiple battery cells 20 are connected in parallel, in series, or in a mixed combination and placed in the box 11 formed by the first part 111 and the second part 112 being buckled together.

[0087] 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.

[0088] 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.

[0089] Figure 3 FIG. 2 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, on which a pressure relief mechanism 213 is disposed, 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 has a receiving cavity 26. The insulating member 23 has a discharge channel connecting the pressure relief mechanism 213 and the electrode assembly 22. The supporting member 24 is accommodated in the receiving cavity 26 to limit the deformation of the discharge channel.

[0090] 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.

[0091] A pressure relief mechanism 213 is provided on the first wall 211. 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 embodiment 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 embodiment 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.

[0092] The electrode assembly 22 is a component in the battery cell 20 where an electrochemical reaction occurs. The electrode assembly 22 may be a cylinder, a cuboid, etc. If the electrode assembly 22 is a cylindrical structure, the shell 212 may also be a cylindrical structure. If the electrode assembly 22 is a cuboid structure, the shell 212 may also be a cuboid structure. For ease of explanation, the embodiment of the present application takes the shell 212 as an example of a cuboid. For any electrode assembly 22, the electrode assembly 22 may include at least two tabs, and the at least two tabs may include at least one positive tab and at least one negative tab. The positive tab may be formed by stacking a portion of the positive electrode sheet that is not coated with the positive active material layer, and the negative tab may be formed by stacking a portion of the negative electrode sheet that is not coated with the negative active material layer.

[0093] 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, thereby reducing the possibility of charging of the first wall 211. Optionally, the material of the insulating member 23 may include polypropylene (PP) material, polyphenylene sulfide (PPS) material, or soluble polytetrafluoroethylene (PFA) material, etc. Figure 4 A schematic diagram of the structure of the first wall 211, the insulating member 23 and the supporting member 24 is shown. Figure 4 As shown, the insulating member 23 may include a space that is recessed relative to the main body of the insulating member 23, and these recessed spaces form a receiving cavity 26 of the insulating member 23. The insulating member 23 has a discharge channel that connects the pressure relief mechanism 213 and the electrode assembly 22, wherein the discharge channel refers to the path of the high-temperature and high-pressure material from the inside of the battery cell 20 to the pressure relief mechanism 213 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 can also be understood as being used to connect 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.

[0094] The support member 24 is disposed in the accommodating cavity 26 of the insulating member 23. Figure 5 As shown, in some embodiments, at least a portion of the support member 24 is accommodated in the accommodating cavity 26. In some embodiments, the support member 24 may be made of a different material from 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 can be prevented from being melted by the high temperature substance generated by the thermal runaway. Optionally, the material of the support member 24 may include at least one hard material selected from materials such as metal, graphite, polytetrafluoroethylene, mica or ceramic.

[0095] In a possible implementation, the support member 24 may be fixedly connected to the insulating member 23, for example, the support member 24 may be bonded to the surface of the insulating member 23. In another possible implementation, the support member 24 may be accommodated in the accommodating cavity 26 by interference fit, thereby reducing the possibility of the support member 24 falling from the accommodating cavity 26.

[0096] In the event of thermal runaway inside the battery cell 20, the support member 24 can limit the deformation of the exhaust channel and keep the exhaust channel unobstructed, so that the high-temperature and high-pressure substances generated by the thermal runaway can reach the pressure relief mechanism 213 along the exhaust channel, so that the pressure relief mechanism 213 is actuated. In the embodiment of the present application, the support member can limit the deformation of the exhaust channel formed by the insulating member, wherein the deformation of the exhaust channel refers to the deformation exceeding the elastic range of the insulating member itself, and limiting the deformation of the exhaust channel refers to reducing the degree of deformation of the exhaust channel. In other words, the embodiment of the present application allows the exhaust channel to deform within its own elastic range. Compared with the case where no support member is provided on the insulating member, the support member can reduce the deformation of the exhaust channel formed by the insulating member under the action of external force to a greater extent, so that the exhaust channel is not easily deformed to the extent that the high-temperature and high-pressure substances cannot be discharged to the pressure relief mechanism.

[0097] by Figure 6 Take this as an example to illustrate: Figure 6 The figure shows a possible discharge path of the high-temperature and high-pressure substances generated by thermal runaway when thermal runaway occurs inside the battery cell 20, and a simplified structural diagram of the changes that occur in the electrode assembly 22 under the action of the high-temperature and high-pressure substances. Figure 6 As shown in (a) of FIG. 1 , 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. Figure 6As shown in (b), 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. When the electrode assembly 22 further moves toward the pressure relief mechanism 213, the melted and softened insulating member 23 will also deform with the movement of the electrode assembly 22, resulting in blockage of the discharge channel. On the one hand, the high-temperature and high-pressure substances cannot reach the pressure relief mechanism 213 through the discharge channel, and the temperature or pressure in the area around the pressure relief mechanism 213 does not reach the actuation threshold, so the pressure relief mechanism 213 cannot be actuated; on the other hand, the electrode assembly 22 may further block the pressure relief mechanism 213 driven by the high-temperature and high-pressure substances, and may also make the pressure relief mechanism 213 unable to actuate normally. When the high-temperature and high-pressure substances accumulate to a certain extent inside the battery cell 20, it is easy to cause an explosion. As Figure 6 As shown in (c), the battery cell 20 provided in the embodiment of the present application is provided with a support member 24. When a large amount of high-temperature and high-pressure substances are generated inside the battery cell 20, even if the insulating member 23 is melted and softened under the action of the high-temperature substances, the support member 24 can limit the deformation of the discharge channel on the insulating member 23, and keep the discharge channel as unobstructed as possible when the electrode assembly 22 moves, so that the high-temperature and high-pressure substances can reach the pressure relief mechanism 213. At the same time, the support member 24 can also limit the further movement of the electrode assembly 22, reduce the possibility that the pressure relief mechanism 213 is directly blocked by the electrode assembly 22, and thus can also keep the discharge channel unobstructed.

[0098] The battery cell 20 provided in the embodiment of the present application can limit the deformation of the discharge channel through the support member 24 when thermal runaway occurs inside the battery cell 20, 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 materials inside the battery cell 20, thereby improving the reliability of the battery cell 20.

[0099] According to some embodiments of the present application, optionally, the insulating member 23 includes a first insulating wall 231 , and an accommodating cavity 26 is formed between the first insulating wall 231 and the first wall 211 .

[0100] like Figure 7 As shown, the first insulating wall 231 is located on a surface of the insulating member 23 facing the battery assembly along the thickness direction Z of the first wall 211. Specifically, the first insulating wall 231 may be a thin sheet structure perpendicular to the thickness direction Z of the first wall 211.

[0101] There is a gap between the first insulating wall 231 and the first wall 211, specifically, there is a gap in the thickness direction Z of the first wall 211. The thickness direction Z of the first wall 211 may be the thickness direction Z of the insulating member 23, which is perpendicular to the length direction X and the width direction Y of the first wall 211. The gap is used to form an accommodating cavity 26 for accommodating the supporting member 24.

[0102] like Figure 7 As shown, the support member 24 is accommodated in the accommodation cavity formed between the first insulating wall 231 and the first wall 211 , and the first insulating wall 231 provides support for the support member 24 on one side of the support member 24 along the thickness direction Z of the first wall 211 toward the electrode assembly 22 .

[0103] The first insulating wall 231 can provide support for the support member 24, reduce the possibility of the support member 24 falling from the accommodating cavity 26, and help maintain the position of the support member 24 relative to the insulating member 23, thereby improving the effect of the support member 24 in limiting the deformation of the exhaust channel.

[0104] According to some embodiments of the present application, optionally, a projection of the first insulating wall 231 in the thickness direction Z of the first wall 211 covers a projection of the support member 24 in the thickness direction Z of the first wall 211 .

[0105] In a possible implementation, the support member 24 is disposed in the accommodating cavity 26, and the support member 24 contacts the first wall 211 on one side along the thickness direction Z of the first wall 211, and contacts the first insulating wall 231 on the other side. In the thickness direction Z of the first wall 211, the projection of the first insulating wall 231 covers the projection of the support member 24, and the first insulating wall 231 can achieve insulation between the support member 24 and the electrode assembly 22 in the thickness direction Z of the first wall 211. Regardless of whether the support member 24 itself is an insulating material, the first insulating wall 231 can improve the insulation performance between the electrode assembly 22 and the support member 24.

[0106] This can ensure better insulation performance between the electrode assembly 22 and the first wall 211 , reduce the possibility of the first wall 211 being charged due to contact between the electrode assembly 22 and the support member 24 , or between the support member 24 and the first wall 211 , and help improve the reliability of the battery cell 20 .

[0107] According to some embodiments of the present application, optionally, the insulating member 23 includes a second insulating wall 232 , which is disposed between the first insulating wall 231 and the first wall 211 , and forms a receiving cavity 26 with the first insulating wall 231 .

[0108] In the embodiment of the present application, the insulating member 23 may include a first insulating wall 231 and a second insulating wall 232, and the second insulating wall 232 may be a thin sheet structure perpendicular to the thickness direction Z of the first wall 211. There is a certain gap between the first insulating wall 231 and the second insulating wall 232, and the gap is the accommodating cavity 26 for accommodating the supporting member.

[0109] Figure 8 It is shown that Figure 7 A view of the structure along the thickness direction Z of the first wall 211, Fig. 9 yes Figure 8 A possible cross-section of the structure along the AA direction.

[0110] like Figure 8 and Fig. 9 As shown, the second insulating wall 232 may be a portion of the insulating member 23 that is in direct contact with the first wall 211. Optionally, the second insulating wall 232 may be fixedly connected to the first wall 211. An accommodating cavity 26 is formed between the second insulating wall 232 and the first insulating wall 231, and the support member 24 is accommodated in the accommodating cavity 26. Portions of the first wall 211 that are not provided with components with certain functions may be covered by the second insulating wall 232, wherein the components with certain functions on the first wall 211 may be, for example, components for electrically connecting the electrode terminal 214 and the electrode assembly 22, injection holes, etc. Figure 8 and Fig. 9 The second insulating wall 232 shown covers the surface of the first wall 211 facing the electrode assembly 22 as much as possible, which can improve the insulating performance of the insulating member 23 .

[0111] Fig.10 yes Figure 8 Another possible cross-sectional view of the structure in the AA direction, Fig.11 is with Fig.10 The structure shown corresponds to an axonometric view.

[0112] like Fig.10 and Fig.11 As shown, the second insulating wall 232 can also be a portion of the insulating member 23 that is in direct contact with the first wall 211. The second insulating wall 232 can be located only in the area where the support member 24 is located, isolating the support member 24 from the first wall 211. The support member 24 is accommodated in the accommodation cavity 26 formed between the second insulating wall 232 and the first insulating wall 231. In a possible implementation, in the thickness direction Z of the first wall 211, the projection of the second insulating wall 232 can cover the projection of the support member 24. Fig.10 and Fig.11The second insulating wall 232 shown can reduce the weight of the insulating component 23 and reduce the manufacturing cost of the insulating component 23 while satisfying the insulation performance between the first wall 211 and the electrode assembly 22 .

[0113] The second insulating wall 232 can isolate the support member 24 from the first wall 211, thereby improving the insulation performance between the support member 24 and the first wall 211. At the same time, the accommodation cavity 26 formed by the second insulating wall 232 and the first insulating wall 231 can provide a more stable accommodation space for the support member 24, so that the support member 24 is not easy to fall during the assembly process.

[0114] According to some embodiments of the present application, optionally, the insulating member 23 includes a second insulating wall 232, which is arranged on the surface of the insulating member 23 facing the first wall 211 in the thickness direction Z of the first wall 211, and a accommodating cavity 26 is formed between the second insulating wall 232 and the surface of the insulating member 23 facing the electrode assembly 22 in the thickness direction Z of the first wall 211.

[0115] Fig.12 yes Figure 8 Another possible cross-sectional view of the structure in the AA direction is as follows: Fig.12 As shown, the second insulating wall 232 is disposed on the surface of the insulating member 23 facing the first wall 211 in the thickness direction Z of the first wall 211. Optionally, the second insulating wall 232 may be connected to the first wall 211. Fig.12 In the illustrated embodiment, the insulating member 23 may include a second insulating wall 232 but not a first insulating wall 231. In a possible implementation, all portions of the first wall 211 where components with certain functions are not provided may be covered by the second insulating wall 232; alternatively, the second insulating wall 232 may be located only in the region where the support member 24 is located, isolating the support member 24 from the first wall 211.

[0116] An accommodation cavity 26 may be formed between the second insulating wall 232 and a surface of the insulating member 23 facing the electrode assembly 22 in the thickness direction Z of the first wall 211 , and the support member 24 is accommodated in the accommodation cavity 26 .

[0117] The second insulating wall 232 can separate the support member 24 from the first wall 211 , and play an insulating role between the support member 24 and the first wall 211 , so that the first wall 211 is not easily charged, thereby improving the reliability of the battery cell 20 .

[0118] According to some embodiments of the present application, optionally, the insulating member 23 includes a connecting wall 233 , the connecting wall 233 connects the first insulating wall 231 and the second insulating wall 232 , and the connecting wall 233 extends along the thickness direction Z of the first wall 211 .

[0119] like Figures 7 to 12 As shown, in a possible implementation, the connecting wall 233 may extend along the thickness direction Z of the first wall 211 and the width direction Y of the first wall 211 to provide support for the gap between the first insulating wall 231 and the second insulating wall 232. Optionally, the connecting wall 233 may be disposed at the edge of the insulating member 23 or at the middle region of the insulating member 23 to enhance the anti-deformation strength of the corresponding region of the insulating member 23.

[0120] In another possible implementation, the connecting wall 233 may extend along the thickness direction Z of the first wall 211 and the length direction X of the first wall 211. The connecting wall 233 is disposed at the edge of the insulating member 23, and can provide support for the gap between the first insulating wall 231 and the second insulating wall 232, and can also form a receiving cavity 26 for receiving the supporting member 24 together with the first insulating wall 231 and the second insulating wall 232. In this case, the connecting wall 233 can provide support for the supporting member 24 in the width direction Y of the first wall 211.

[0121] In another possible implementation, the edges of the insulating member 23 in the length direction X of the first wall 211 and the width direction Y of the first wall 211 may be provided with connecting walls 233 at the same time to improve the overall strength and stability of the insulating member 23. Optionally, the middle area of ​​the insulating member 23 may also be provided with a connecting wall 233 to enhance the anti-deformation strength of the middle area of ​​the insulating member 23.

[0122] The connecting wall 233 can improve the anti-deformation strength of the insulating member 23 in the thickness direction Z of the first wall 211 , and provide support for the supporting member 24 accommodated in the accommodating cavity 26 , so that the supporting member 24 is not easy to fall off.

[0123] According to some embodiments of the present application, optionally, the connecting wall 233 is provided with a discharge hole 234 penetrating the connecting wall 233 in a thickness direction Z of the connecting wall 233 .

[0124] The connecting wall 233 is a structure connecting the first insulating wall 231 and the second insulating wall 232 on the insulating member 23. The discharge hole 234 penetrates the connecting wall 233 in the thickness direction Z of the connecting wall 233. The high-temperature and high-pressure substances generated inside the battery cell 20 can escape to the gap between the first connecting wall 233 and the second connecting wall 233 through the discharge hole 234. The discharge hole 234 and the gap can form a discharge channel. In particular, when the connecting 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 location of the pressure relief mechanism 213, so as to actuate the pressure relief mechanism 213.

[0125] In a possible implementation manner, the connecting wall 233 of the insulating member 23 extending along the thickness direction Z of the first wall 211 and the width direction Y of the first wall 211 is provided with a discharge hole 234, such as Figures 7 to 9 Optionally, the connecting wall 233 of the insulating member 23 extending along the thickness direction Z of the first wall 211 and the length direction X of the first wall 211 may also be provided with a discharge hole 234 .

[0126] The discharge hole 234 on the connecting wall 233 can form a discharge channel together with the accommodating cavity 26 to guide the high-temperature and high-pressure material to flow toward the pressure relief mechanism 213, which is conducive to the actuation of the pressure relief structure to quickly discharge the high-temperature and high-pressure material inside the battery cell, thereby improving the reliability of the battery cell 20.

[0127] According to some embodiments of the present application, optionally, the connecting wall 233 includes a first connecting portion 2331, the first connecting portion 2331 is arranged on both sides of the pressure relief mechanism 213 in the length direction X of the first wall 211, and the discharge hole 234 includes a first through hole 2341, the first through hole 2341 penetrates the first connecting portion 2331 in the length direction X of the first wall 211, and the first through hole 2341 is used to form a discharge channel.

[0128] like Figures 7 to 12 As shown, the first connection portion 2331 refers to the portion of the connecting wall 233 disposed on both sides of the pressure relief mechanism 213 in the length direction X of the first wall 211. In some embodiments, the pressure relief mechanism 213 can be disposed in the middle area of ​​the first wall 211, and the first connection portion 2331 can correspond to the position of the pressure relief mechanism 213 and be disposed in the middle area of ​​the insulating member 23.

[0129] The first through hole 2341 refers to the discharge hole 234 arranged on the first connection part 2331 in the discharge hole 234. The first through hole 2341 penetrates the first connection part 2331 in the length direction X of the first wall 211. The first connection part 2331 is arranged along the length direction X of the first wall 211. Then, the first through hole 2341 can connect the area where the pressure relief mechanism 213 is located with the area where the accommodating chamber 26 is located, thereby forming at least a part of the discharge channel.

[0130] The first connection 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.

[0131] 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.

[0132] like Figures 7 to 12 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 the first insulating wall 231 or the second insulating wall 232, and the second through hole 236 can penetrate the first insulating wall 231 or the second insulating wall 232 in the thickness direction Z of the first wall 211; optionally, the insulating member 23 includes the first insulating wall 231 and the second insulating wall 232, and the second through hole 236 penetrates the first insulating wall 231 and the second insulating wall 232 at the same time. 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.

[0133] 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 .

[0134] According to some embodiments of the present application, optionally, the support member 24 is disposed on an edge of the insulating member 23 on a plane perpendicular to the thickness direction Z of the first wall 211 .

[0135] like Figures 13 to 15 As shown, Fig.13 yes Figure 7 A schematic diagram of the exploded structure of the structure shown in FIG. Fig.14 is another schematic diagram of the structure of the first wall, the insulating member and the supporting member, Fig.15 yes Fig.14 Schematic diagram of the exploded structure of the structure shown in FIG.

[0136] On a plane perpendicular to the thickness direction Z of the first wall 211, the support member 24 may be disposed at the edge of the insulating member 23. Specifically, on the plane, the insulating member 23 may be approximately rectangular, and the support member 24 may be located at the long side or the wide side of the rectangle. Figures 13 to 15 The supporting member 24 is shown as being disposed on the long side of the rectangle, and the supporting member 24 extends along the length direction X of the first wall 211. Similarly, the supporting member 24 may extend along the width direction Y of the first wall 211 and be disposed on the wide side of the rectangle.

[0137] The support member 24 is disposed on the edge of the insulating member 23 so as not to interfere with other members in the battery cell 20 , which is beneficial to improving the qualified rate of the battery cell 20 .

[0138] 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 Y of the first wall 211 .

[0139] The edge of the insulating member 23 in the width direction Y 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 X of the first wall 211 .

[0140] 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 .

[0141] 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 on the insulating member 23 and the electrode assembly 22 in a larger range, thereby limiting the deformation of the exhaust passage.

[0142] According to some embodiments of the present application, optionally, the support members 24 are arranged at intervals along the length direction X of the first wall 211 .

[0143] like Fig.13 As shown, the support members 24 may extend along the length direction X of the first wall 211 and be spaced apart in the length direction X of the first wall 211 , which can reduce the overall weight of the battery cell 20 while limiting deformation of the exhaust passage.

[0144] Optionally, Fig.13 For example, Fig.13 It is shown that two support members 24 are arranged in the length direction X 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.

[0145] 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 X of the first wall 211 .

[0146] The edge of the insulating member 23 in the length direction X 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 Y of the first wall 211. Fig.16 As shown, the support members 24 may extend along the width direction Y of the first wall 211. Alternatively, the support members 24 may be arranged at intervals along the width direction Y of the first wall 211.

[0147] In some embodiments, the support member 24 may be disposed at the edges of the insulating member 23 in the length direction X and the width direction Y of the first wall 211 at the same time.

[0148] The support member 24 is arranged on the wide side of the insulating member 23 to limit the deformation of the insulating member 23 at the corresponding position of the insulating member 23, and at the same time limit the movement of the electrode assembly 22 toward the pressure relief mechanism 213 to a certain extent, thereby reducing the probability of the electrode assembly 22 blocking the pressure relief mechanism 213 and keeping the discharge channel unobstructed.

[0149] According to some embodiments of the present application, optionally, the support member 24 is disposed in a surrounding area of ​​the pressure relief mechanism 213 .

[0150] Fig.17 The support member 24 is shown to extend along the width direction Y of the first wall 211 and is disposed on at least one side of the pressure relief mechanism 213 in the length direction X of the first wall 211. Alternatively, the support member 24 may extend along the length direction X of the first wall 211 and be disposed on at least one side of the pressure relief mechanism 213 in the width direction Y of the first wall 211. Alternatively, the support member 24 may be disposed opposite to the pressure relief mechanism 213 in the thickness direction Z of the first wall 211.

[0151] The support member 24 is disposed in the surrounding area of ​​the pressure relief mechanism 213, which can more directly limit the electrode assembly 22 near 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. 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.

[0152] According to some embodiments of the present application, optionally, a plurality of support members 24 enclose a surrounding area of ​​the pressure relief mechanism 213 to form an accommodation space, and the pressure relief mechanism 213 is disposed in the accommodation space.

[0153] 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 X and the width direction Y of the first wall 211. In this case, a plurality of support members 24 may be enclosed to form 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.

[0154] The plurality of support members 24 disposed around the pressure relief mechanism 213 can further limit the deformation of the structure around the pressure relief mechanism 213 and keep the discharge channel around the pressure relief mechanism 213 unobstructed.

[0155] According to some embodiments of the present application, optionally, the support member 24 is provided with a third through hole 241 , and the third through hole 241 is used to form a discharge channel.

[0156] The third through hole 241 may be in communication with the accommodating chamber 26 , and optionally, may be in communication with the electrode assembly 22 and the region where it is located, and optionally, may be in communication with the pressure relief mechanism 213 and the region where it is located.

[0157] In one possible embodiment, the third through hole 241 may penetrate the support member 24 along a certain direction. For example, when the support member 24 extends along the width direction Y of the first wall 211, the third through hole 241 may penetrate the support member 24 along the length direction X of the first wall 211; alternatively, when the support member 24 extends along the length direction X of the first wall 211, the third through hole 241 may penetrate the support member 24 along the width direction Y of the first wall 211. In another possible embodiment, the third through hole 241 may form channels on the support structure from two intersecting directions. For example, the openings of the third through hole 241 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.

[0158] In a possible implementation, the third through hole 241 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 241 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 241 may be communicated with the first through hole 2341; alternatively, the third through hole 241 may be communicated with the second through hole 236.

[0159] The third through hole 241 penetrates the support structure 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 241. 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 241.

[0160] The third through hole 241 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 .

[0161] According to some embodiments of the present application, optionally, the support member 24 includes a long strip-shaped main body.

[0162] 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 accommodating cavity 26 to the other end along the length direction X 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.

[0163] 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.

[0164] 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 .

[0165] 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 in the accommodating cavity 26, and play a supporting role for the electrode assembly 22 moving toward the pressure relief mechanism 213, so that the electrode assembly 22 is difficult to move to a position that blocks the discharge channel, thereby limiting the deformation of the discharge channel, providing a discharge channel for the high temperature and high pressure substance to reach the pressure relief mechanism 213, and is conducive to improving the reliability of the battery cell 20.

[0166] According to some embodiments of the present application, optionally, the melting point of the support member 24 is greater than 100°C.

[0167] 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.

[0168] 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.

[0169] 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.

[0170] 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.

[0171] 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.

[0172] In this embodiment, a support member 24 having a melting point greater than 100°C is used, which is advantageous in that the battery cell 20 is not easily melted when thermal runaway occurs, thereby enabling a gas exhaust passage connected to the pressure relief mechanism 213 to be formed between the first wall 211 and the electrode assembly 22, so that the thermal runaway gas can be discharged to the outside of the battery cell 20 through the pressure relief mechanism 213 in a timely manner, thereby helping to improve the reliability of the battery cell 20.

[0173] According to some embodiments of the present application, optionally, the first wall 211 is provided with an electrode terminal 214, the battery cell 20 includes a connecting member 25, the connecting member 25 is used to electrically connect the electrode terminal 214 and the electrode assembly 22, the insulating member 23 has an avoidance hole 235 that penetrates the insulating member 23 in the thickness direction Z of the first wall 211, and at least a portion of the connecting member 25 is accommodated in the avoidance hole 235.

[0174] Optionally, the battery cell 20 may further 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, and 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 25, 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 25, and the negative pole tabs of one or more electrode assemblies 22 are connected to the negative electrode terminal 214b through another connecting member 25. In the battery cell 20, according to actual use requirements, the electrode assembly 22 can be provided as a single or multiple.

[0175] The avoidance hole 235 penetrates the insulating member 23 and is used to avoid the connecting member 25, so that the connecting member 25 can be electrically connected to the electrode terminal 214 on the one hand, and the connecting member 25 can be electrically connected to the electrode assembly 22 on the other hand. Figures 13 to 17 As shown, in some embodiments, the avoidance hole 235 may have the same shape as the connecting member 25, in which case the connecting member 25 may be completely accommodated in the avoidance hole 235. Optionally, the area occupied by the avoidance hole 235 may be larger than the area occupied by the connecting member 25 on the first wall 211, and the connecting member 25 may also be completely accommodated in the avoidance hole 235. Optionally, the avoidance hole 235 may be provided only at the portion where the connecting member 25 is connected to the electrode terminal 214, in which case the portion of the connecting member 25 used for connecting to the electrode terminal 214 is accommodated in the avoidance hole 235, and the other portion is accommodated in the accommodation cavity 26.

[0176] The avoidance hole 235 can provide space for the connection member 25 to electrically connect the electrode terminal 214 and the electrode assembly 22 , so that the electric energy generated in the electrode assembly 22 can be led out of the battery cell 20 to provide electric energy to the electric device.

[0177] According to some embodiments of the present application, optionally, the support member 24 is interference fit with the accommodating cavity 26 .

[0178] Interference fit means that the size of the support member 24 in a certain direction is larger than the size of the accommodating cavity 26 in that direction. During the assembly process, the elasticity of the material of the insulating member 23 is utilized to allow the accommodating cavity 26 to expand and deform in that direction so as to accommodate the support member 24. After the accommodating cavity 26 recovers, it can generate force to fix the support member 24 in the accommodating cavity 26.

[0179] In a possible embodiment, the support member 24 may be interference fit with the accommodating cavity 26 in the length direction X of the first wall 211. The support member 24 may abut against the connecting wall 233 on the insulating member 23 in the length direction X of the first wall 211, and the size of the support member 24 in the length direction X of the first wall 211 may be slightly larger than the distance between the two connecting walls 233 arranged opposite to each other in the length direction X of the first wall 211. During the assembly process, the size of the accommodating cavity 26 in the length direction X of the first wall 211 may be expanded by external force, and the support member 24 may be placed in the accommodating cavity 26, and the accommodating cavity 26 in the length direction X of the first wall 211 may be clamped in the length direction X of the first wall 211 after the structure of the accommodating cavity 26 in the length direction X of the first wall 211 is restored.

[0180] Optionally, the support member 24 may be interference fit with the accommodating cavity 26 in the thickness direction Z of the first wall 211. For example, if the insulating member 23 is provided with a first insulating wall 231, the first insulating wall 231 and the first wall 211 may exert a force on the support member 24 in the thickness direction Z of the first wall 211. For another example, if the insulating member 23 is provided with a first insulating wall 231 and a second insulating wall 232, the first insulating wall 231 and the second insulating wall 232 may exert a force on the support member 24 in the thickness direction Z of the first wall 211. The size of the support member 24 in the thickness direction Z of the first wall 211 may be slightly larger than the size of the accommodating cavity 26 in the thickness direction Z of the first wall 211, wherein the size of the accommodating cavity 26 in the thickness direction Z of the first wall 211 may refer to the distance between the two surfaces forming the accommodating cavity in the thickness direction Z of the first wall 211. During the assembly process, external force can be used to expand the size of the accommodating cavity 26 in the thickness direction Z of the first wall 211, and the supporting member 24 can be placed in the accommodating cavity 26. After the structure of the accommodating cavity 26 in the thickness direction Z of the first wall 211 is restored, the supporting member 24 can be clamped in the thickness direction Z of the first wall 211.

[0181] Optionally, the support member 24 may be interference fit with the accommodating cavity 26 in the width direction Y of the first wall 211. For example, in the case where the support member 24 extends along the width direction Y of the first wall 211, the size of the support member 24 in the width direction Y of the first wall 211 may be slightly larger than the size of the accommodating cavity 26 in the width direction Y of the first wall 211, wherein the size of the accommodating cavity 26 in the width direction Y of the first wall 211 may refer to the distance between the two surfaces of the insulating member 23 that contact the support member 24 in the width direction Y of the first wall 211. During the assembly process, the size of the accommodating cavity 26 in the width direction Y of the first wall 211 may be expanded by external force, and the support member 24 may be placed in the accommodating cavity 26. Then, after the structure of the accommodating cavity 26 in the width direction Y of the first wall 211 is restored, the support member 24 can be clamped in the width direction Y of the first wall 211.

[0182] Optionally, the accommodating cavity 26 and the supporting member 24 may be interference-fitted in multiple directions simultaneously.

[0183] In this way, the support member 24 can be fixed in the accommodating cavity 26 more easily, so that the support member 24 is not easy to fall out of the accommodating cavity 26, which is beneficial to keep the discharge channel unobstructed when high-temperature and high-pressure substances are generated inside the battery cell 20, and is beneficial to improving the reliability of the battery cell 20.

[0184] 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.

[0185] 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.

[0186] 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 .

[0187] 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 .

[0188] In some embodiments, the support member 24 may be made of an insulating material, for example, may be made of high temperature resistant ceramics.

[0189] 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 .

[0190] The present application also provides a battery, comprising the battery cell 20 described in any of the above embodiments.

[0191] The present application also provides an electrical device, comprising the battery described in any of the above embodiments, wherein the battery is used to provide electrical energy to the electrical device.

[0192] The embodiment of the present application provides a battery cell 20, the housing 21 of the battery cell 20 includes a first wall 211 and a shell 212, and the electrode assembly 22 is accommodated in the shell 212. The first wall 211 is provided with an electrode terminal 214 and a pressure relief mechanism 213, and the electrode terminal 214 is electrically connected to the electrode assembly 22 through a connecting member 25. An insulating member 23 is provided between the first wall 211 and the electrode assembly 22, and the insulating member 23 has a receiving cavity 26, and the support member 24 is accommodated in the receiving cavity 26. The insulating member 23 has a discharge channel connecting the pressure relief mechanism 213 and the electrode assembly 22, and the support member 24 is used to limit the deformation of the discharge channel. 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 easily melted under the action of high-temperature and high-pressure substances, and can maintain the shape and position of the insulating member 23. At the same time, it limits the movement of the electrode assembly 22 toward the first wall 211, keeps the discharge channel unobstructed, and enables the pressure relief mechanism 213 to be normally actuated to discharge high-temperature and high-pressure substances, thereby improving the reliability of the battery cell 20.

[0193] 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), the housing (21) having a first wall (211), the first wall (211) being provided with a pressure relief mechanism (213); 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), the insulating member (23) having a receiving cavity (26), and the insulating member (23) having a discharge channel connecting the pressure relief mechanism (213) and the electrode assembly (22); A support member (24) is accommodated in the accommodation chamber (26) and is used to limit deformation of the discharge passage.

2. The battery cell according to claim 1, characterized in that: The insulating component (23) comprises a first insulating wall (231), and the accommodating cavity (26) is formed between the first insulating wall (231) and the first wall (211).

3. The battery cell according to claim 2, characterized in that: A projection of the first insulating wall (231) in the thickness direction (Z) of the first wall (211) covers a projection of the supporting member (24) in the thickness direction (Z) of the first wall (211).

4. The battery cell according to claim 2 or 3, characterized in that: The insulating component (23) comprises a second insulating wall (232), which is arranged between the first insulating wall (231) and the first wall (211), and forms the accommodating cavity (26) between the second insulating wall (232) and the first insulating wall (231).

5. The battery cell according to claim 1, characterized in that: The insulating component (23) includes a second insulating wall (232), which is arranged on a surface of the insulating component (23) facing the first wall (211) in the thickness direction (Z) of the first wall (211), and the accommodating cavity (26) is formed between the second insulating wall (232) and the surface of the insulating component (23) facing the electrode assembly (22) in the thickness direction (Z) of the first wall (211).

6. The battery cell according to claim 4, characterized in that: The insulating component (23) comprises a connecting wall (233), wherein the connecting wall (233) connects the first insulating wall (231) and the second insulating wall (232), and the connecting wall (233) extends along the first direction (Z).

7. The battery cell according to claim 6, characterized in that: The connecting wall (233) is provided with a discharge hole (234) penetrating the connecting wall (233) in the thickness direction of the connecting wall (233).

8. The battery cell according to claim 7, characterized in that: The connecting wall (233) includes a first connecting portion (2331), and the first connecting portion (2331) is arranged on both sides of the pressure relief mechanism (213) in the length direction (X) of the first wall (211); the discharge hole (234) includes a first through hole (2341), and the first through hole (2341) passes through the first connecting portion (2331) in the length direction (X) of the first wall (211); the first through hole (2341) is used to form the discharge channel.

9. The battery cell according to any one of claims 1 to 8, characterized in that: The insulating member (23) has a second through hole (236) penetrating the insulating member (23) in the thickness direction (Z) 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.

10. The battery cell according to any one of claims 1 to 9, characterized in that: The supporting member (24) is disposed on an edge of the insulating member (23) on a plane perpendicular to a thickness direction (Z) of the first wall (211).

11. The battery cell according to claim 10, characterized in that: The supporting member (24) is located at an edge of the insulating member (23) in the width direction (Y) of the first wall (211).

12. The battery cell according to claim 11, characterized in that: The support members (24) are arranged at intervals along the length direction (X) of the first wall (211).

13. The battery cell according to any one of claims 10 to 12, characterized in that: The supporting member (24) is located at an edge of the insulating member (23) in the length direction (X) of the first wall (211).

14. The battery cell according to any one of claims 1 to 13, characterized in that: The supporting member (24) is arranged in the surrounding area of ​​the pressure relief mechanism (213).

15. The battery cell according to claim 14, characterized in that: The plurality of support members (24) enclose a surrounding area of ​​the pressure relief mechanism (213) to form a receiving space, and the pressure relief mechanism (213) is arranged in the receiving space.

16. The battery cell according to claims 10 to 15, characterized in that: The supporting member (24) is provided with a third through hole (241), and the third through hole (241) is used to form the discharge passage.

17. The battery cell according to any one of claims 1 to 16, characterized in that: The supporting member (24) comprises a long strip-shaped main body.

18. The battery cell according to any one of claims 1 to 17, characterized in that: The supporting member (24) has a melting point higher than that of the insulating member (23).

19. The battery cell according to claim 18, characterized in that: The melting point of the supporting member (24) is greater than 100°C.

20. The battery cell according to any one of claims 1 to 19, characterized in that: The first wall (211) is provided with an electrode terminal (214), and the battery cell comprises: A connecting member (25) is used to electrically connect the electrode terminal (214) and the electrode assembly (22); the insulating member (23) has a avoidance hole (235) that penetrates the insulating member (23) in the first direction (Z); at least a portion of the connecting member (25) is accommodated in the avoidance hole (235).

21. The battery cell according to any one of claims 1 to 20, characterized in that: The supporting member (24) and the accommodating cavity (26) are interference fit.

22. The battery cell according to any one of claims 1 to 21, 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.

23. A battery, characterized in that: include: A battery cell as claimed in any one of claims 1 to 22.

24. An electrical device, characterized in that: The battery as claimed in claim 23 is used to provide electrical energy to the electrical device.

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