Battery cell, battery and electric device

Abstract

The utility model is suitable for the technical field of batteries, and provides a battery monomer, a battery and an electric device. Each battery cell comprises a shell, an electrode assembly, an insulating member and a supporting member; the shell is provided with a first wall, a second wall and a pressure relief mechanism, the pressure relief mechanism is arranged on the first wall, and the first wall and the second wall intersect; the electrode assembly is arranged in the shell; a first space is formed between the outer peripheral wall of the electrode assembly and the second wall; the insulating component is arranged in the shell and located between the first wall and the electrode assembly, and a second space is formed between the insulating component and the pressure relief mechanism; the supporting component is provided with a second exhaust channel. The projection area of the supporting component on the insulating component is located in the area outside the first exhaust channel, and the melting point of the supporting component is larger than that of the insulating component. According to the battery monomer, the battery and the power utilization device provided by the invention, the side weld cracking risk of the battery monomer can be reduced to a certain extent.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and in particular relates to a battery cell, a battery and an electrical device. Background Art

[0002] Batteries are increasingly used. Batteries are repeatedly charged and discharged during use, generating high temperatures. When a battery experiences thermal runaway, the exhaust channel between the electrode assembly and the pressure relief mechanism of the battery cell is easily closed, causing the side weld of the battery cell to crack. Utility Model Content

[0003] In view of the above problems, the present application provides a battery cell, a battery and an electrical device, aiming to improve the technical problem that the side weld of the battery cell is prone to cracking in the case of thermal runaway.

[0004] In a first aspect, an embodiment of the present application provides a battery cell, including:

[0005] A shell having a first wall, a second wall and a pressure relief mechanism, wherein the pressure relief mechanism is arranged on the first wall, and the first wall and the second wall are arranged to intersect each other; an electrode assembly is arranged in the shell; a first space is formed between the outer peripheral wall of the electrode assembly and the second wall; an insulating member is arranged in the shell and is located between the first wall and the electrode assembly, a second space is formed between the insulating member and the pressure relief mechanism, and a first exhaust channel is provided on the insulating member; the first exhaust channel connects the first space and the second space; and a supporting member is arranged in the shell and is located between the first wall and the insulating member, and a second exhaust channel is provided on the supporting member, and the second exhaust channel is used to connect the first space and the second space; wherein the projection of the supporting member on the insulating member is located outside the first exhaust channel, and the melting point of the supporting member is greater than the melting point of the insulating member.

[0006] The battery cell provided in the embodiment of the present application has a first exhaust channel set in the insulating member, a support member with a higher melting point than the insulating member is added to the battery cell, and a second exhaust channel is set in the support member. In this way, the structural reliability of the support member can be higher than the structural reliability of the insulating member, and the battery cell can be exhausted to the location of the pressure relief mechanism through the first exhaust channel in the early stage of thermal runaway. After the first exhaust channel is melted in the later stage of thermal runaway, the exhaust can be achieved with the help of the second exhaust channel, so that the battery cell provided in this embodiment can continue to maintain the connection between the side cavity and the pressure relief mechanism at all stages of thermal failure, so as to reduce the risk of cracking on the side of the battery cell and improve the safety of the battery cell. Among them, the projection of the support member on the insulating member is located outside the first exhaust channel, which can avoid the support member from blocking or shielding the first exhaust channel, so as not to affect the discharge of gas in the shell in the early stage of thermal runaway.

[0007] In some embodiments, the first end surface of the electrode assembly in the first direction is spaced apart from the second wall, and at least a portion of the first space is formed therebetween, and the position of the support member corresponds to the position of the first end surface. By adopting the solution provided in this embodiment, the support member can be located above at least a portion of the first space, so that the gas in the first space can quickly pass through the support member into the second space in the case of hot melting, thereby achieving rapid exhaust.

[0008] In some embodiments, the support member is spaced apart from the second wall, and the second exhaust channel penetrates the support member along a second direction, and the second direction is parallel to the first direction or is arranged at an angle to the first direction. In this way, after the insulating member is hot-melted, the gas in the first space can quickly enter the second space through the second exhaust channel to achieve rapid exhaust.

[0009] In some embodiments, the first direction is the length direction of the electrode assembly. Under normal circumstances, the outer peripheral wall of the electrode assembly is surrounded by two end faces in the length direction and two end faces in the width direction. The above four end faces are generally spaced apart from the second wall of the shell. However, when the electrode assembly is fully charged, the two end faces in the width direction of the electrode assembly are generally in contact with the inner wall of the shell. At this time, only the two end faces in the length direction of the electrode assembly are spaced apart from the inner wall of the shell. Therefore, the first direction adopts the length direction of the electrode assembly, which can make the support member located above the end face in the length direction of the electrode assembly, so that in the hot melt state, the gas in the first space can enter the second exhaust channel through a shorter path to achieve rapid exhaust.

[0010] In some embodiments, the insulating member is provided with a receiving groove, and at least part of the supporting member is located in the receiving groove. The solution provided by this embodiment can make the volume of the assembly of the insulating member and the supporting member smaller, which is convenient for the miniaturization design of the battery cell.

[0011] In some embodiments, the entire support member is located in the receiving groove. Compared with a support member partially located in the receiving groove and another part located outside the receiving groove, the solution provided by this embodiment can further reduce the volume of the assembly of the insulating member and the support member, facilitating the miniaturization design of the battery cell.

[0012] In some embodiments, the height of the support member and the depth of the receiving groove satisfy the following relationship: H1 / H2=1.0-1.6; wherein H1 is the depth of the receiving groove, and H2 is the height of the support member. The solution provided in this embodiment can make the support member easy to assemble and the exhaust space larger, which can meet the use needs and achieve multiple goals at one stroke.

[0013] In some embodiments, the length dimension of the support member and the length dimension of the receiving groove satisfy the following relationship: L1 / L2=1.0-1.3; wherein L1 is the length of the receiving groove, and L2 is the length of the support member. The solution provided in this embodiment can make the support member easy to assemble and the exhaust space larger, which can meet the use needs and achieve multiple goals at one stroke.

[0014] In some embodiments, the receiving groove includes: a first side wall parallel to the length direction of the supporting member; a second side wall arranged opposite to the first side wall and located on the side of the first side wall away from the center of the insulating member; and two third side walls, provided and spaced apart; the first side wall, the second side wall and the two third side walls are all arranged on the bottom wall of the receiving groove, and together with the bottom wall, form a groove body with an open top. The receiving groove adopts the structure provided by this embodiment, which is simple in structure and easy to process.

[0015] In some embodiments, at least one end of the second side wall extends outside the slot body and protrudes from the corresponding third side wall, so that the size of the second side wall can be larger and the structure of the receiving slot can be stable.

[0016] In some embodiments, both ends of the second side wall extend outside the slot body and protrude from the corresponding third side wall, so that the size of the second side wall can be larger and the structure of the receiving slot can be stable.

[0017] In some embodiments, the battery cell further comprises: an insulating sheet disposed in the housing, the insulating sheet being disposed around the electrode assembly and connected to the insulating member, the insulating sheet being used to cooperate with the insulating member to electrically isolate the housing and the electrode assembly; the insulating sheet being connected to the second side wall. By adopting the solution provided in this embodiment, the connection area between the insulating sheet and the insulating member can be larger, and the connection structure can be stable.

[0018] In some embodiments, the support member is connected to the first wall, so that after the insulating member is melted, the position of the support member does not change, so that it can still be supported between the first wall and the main body of the electrode assembly to ensure the exhaust effect of the second exhaust channel.

[0019] In some embodiments, the support member has an opening disposed toward the bottom wall of the receiving groove, and the opening is connected to the second exhaust channel to form an exhaust cavity. The solution provided in this embodiment is adopted to facilitate the welding operation of the support member and the first wall.

[0020] In some embodiments, the size of the opening in at least one direction is greater than or equal to 3 mm. This can meet the welding requirements of the support member and the first wall and facilitate smooth welding.

[0021] In some embodiments, a reinforcement portion is provided on the bottom wall of the receiving groove, and the reinforcement portion is used to enhance the mechanical strength of the bottom wall. The solution provided by this embodiment can improve the mechanical strength of the bottom wall, the receiving groove and the insulating member to a certain extent.

[0022] In some embodiments, the reinforcement portion protrudes from the bottom wall to form a convex portion, and the convex portion extends into the exhaust cavity through the opening. By adopting the solution provided in this embodiment, the height setting of the reinforcement portion can be less affected by the support member, so that the height of the reinforcement portion is larger, and the reinforcement effect on the receiving groove is better.

[0023] In some embodiments, the height of the protrusion is greater than or equal to 0.5 mm and is less than the distance between the top surface of the exhaust cavity and the bottom wall. By adopting the solution provided in this embodiment, the height of the protrusion can be made larger, so that it has a better reinforcing effect on the structure of the receiving groove and the insulating member. In addition, the protrusion will not abut against the support member when the height range is adopted, so that the volume of the assembly composed of the support member and the insulating member will not be increased due to the presence of the protrusion, and the installation space of the electrode assembly will not be squeezed, achieving multiple goals at one stroke.

[0024] In some embodiments, the protrusion is connected to two side walls of the receiving groove that are arranged opposite to each other. By adopting the solution provided in this embodiment, the protrusion can be connected to the side walls of the receiving groove, so that the provision of the reinforcing part can not only enhance the mechanical strength of the bottom wall of the receiving groove, but also enhance the mechanical strength of part of the side walls of the receiving groove to a certain extent, so that the structure of the receiving groove and the insulating member is more stable.

[0025] In some embodiments, the reinforcement part and the insulating member are integrally formed, so that the connection structure between the reinforcement part and the insulating member is stable and easy to process.

[0026] In some embodiments, the support member includes: a first support portion connected to the first wall; and a second support portion provided between the first support portion and the insulating member and connected to the first support portion, wherein the second support portion and the first support portion enclose the second exhaust channel. The support member adopts the structure provided in this embodiment, which is simple in structure and easy to process.

[0027] In some embodiments, the second support portion includes: a first sheet disposed opposite to the first support portion; and a second sheet connecting the first sheet and the first support portion. The second support portion adopts the structure provided by this embodiment, which is simple in structure and easy to process.

[0028] In some embodiments, the second sheet and the first sheet can be deformed under the action of an external force to enclose an exhaust channel with a triangular cross section with at least part of the first support portion. By adopting the solution provided in this embodiment, in the case of thermal runaway, when the electrode assembly moves toward the first wall, the second sheet will not fit with the first support portion to squeeze out the second exhaust channel, but the first sheet, the second sheet and the first support portion will form an exhaust channel with a triangular cross section, thereby achieving stable support for the electrode assembly and ensuring that the second exhaust channel still exists, which can improve the safety of the battery cell in the case of thermal runaway to a certain extent.

[0029] In some embodiments, the second sheet is integrally formed with the first sheet, so that the connection structure between the second sheet and the first sheet is stable.

[0030] In some embodiments, two second support parts are provided, and the two second support parts are spaced apart and disposed at both ends of the first support part. With the structure provided in this embodiment, the above-mentioned opening can be formed between the two second support parts to facilitate welding of the support member and the first wall.

[0031] In some embodiments, the material of the support member is the same as that of the first wall. Since the support member and the first wall are generally connected by welding, the solution provided in this embodiment facilitates the welding operation between the support member and the first wall.

[0032] In some embodiments, the first exhaust channel is provided with two groups, and the two groups of the first exhaust channels are provided on both sides of the pressure relief mechanism. The support member is also provided with two groups, and the two groups of the support members are provided corresponding to the two groups of the first exhaust channels. Compared with the solution in which the first exhaust channel and the support member are provided with one group, the solution provided in this embodiment can enable the gas on the side where the main body of the electrode assembly is located to quickly reach the pressure relief mechanism through the first exhaust channel or the second exhaust channel on the support member in the case of thermal runaway, so that the battery cell is safer to use.

[0033] In some embodiments, each group of the first exhaust channels includes two first exhaust channels, the two first exhaust channels in the same group are arranged at intervals, and any group of the support members is arranged between the corresponding two first exhaust channels. By adopting the solution provided in this embodiment, the number of first exhaust channels can be large, which is convenient for rapid exhaust in the early stage of thermal runaway.

[0034] In some embodiments, there is a gap between any group of the first exhaust channels and the side wall of the insulating member, and each group of the support members includes two support members, and the two support members in the same group are arranged on both sides of the first exhaust channels of the corresponding group. The solution provided in this embodiment enables a large number of support members, which facilitates rapid exhaust in the later stage of thermal runaway.

[0035] In some embodiments, the insulating member has bosses protruding toward the electrode assembly at both ends in the length direction, and each boss is provided with a group of the first exhaust channels and a group of the support members. Since the receiving groove can accommodate all of the support members, and the support member is provided with the second exhaust channel, the size of the support member in the normal direction of the first wall facing the support member is generally greater than the thickness of the main body of the insulating member. The solution provided in this embodiment can reduce the thickness of the main body of the insulating member, which is convenient for the lightweight design of the battery cell.

[0036] In some embodiments, the support member comprises a metal member. The structure provided by this embodiment makes the support member stable in structure, strong in support strength and high in melting point.

[0037] In some embodiments, the support member is an integrally formed structure. The solution provided in this embodiment is adopted to make the structure of the support member stable.

[0038] In the second aspect, the embodiments of the present application provide a battery, including the battery cell provided by any of the above embodiments. The battery provided by the embodiments of the present application, including the battery cell provided by any of the above embodiments, can continuously maintain the connection between the side cavity of the battery cell and the pressure relief mechanism at various stages of thermal failure, so as to reduce the risk of cracking of the side of the battery cell and improve the safety of the battery cell and the battery in use.

[0039] In a third aspect, an embodiment of the present application provides an electrical device, characterized in that it includes a battery provided by any of the above embodiments. The electrical device provided by an embodiment of the present application, including a battery provided by any of the above embodiments, can continuously maintain the connection between the side cavity of the battery cell and the pressure relief mechanism at various stages of thermal failure, so as to reduce the risk of cracking of the side of the battery cell and improve the safety of the battery cell, the battery and the electrical device.

[0040] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0042] Figure 1 A schematic diagram of the structure of a vehicle according to some embodiments of the present application;

[0043] Figure 2 A schematic diagram of the exploded structure of a battery according to some embodiments of the present application;

[0044] Figure 3 A schematic diagram of the exploded structure of a battery cell according to some embodiments of the present application;

[0045] Figure 4 for Figure 3 The schematic diagram of the main structure of the battery cell shown;

[0046] Figure 5 For battery cells Figure 4 Schematic diagram of the cross-section structure in the AA direction;

[0047] Figure 6 for Figure 5 A schematic diagram of the local enlarged structure at point A in the middle;

[0048] Figure 7 A schematic diagram of a partial cross-sectional structure of a battery cell according to some embodiments of the present application;

[0049] Figure 8 for Figure 3 Schematic diagram of the exploded structure of the insulating member and the supporting member;

[0050] Fig. 9 for Figure 8 A schematic diagram of the local enlarged structure at B in the middle;

[0051] Fig.10 for Figure 8 Structural schematic diagram of the middle support member;

[0052] Fig.11 Schematic diagram of the exploded structure of battery cells of other embodiments of the present application;

[0053] Fig.12 for Fig.11 A schematic cross-sectional structure diagram of a battery cell shown;

[0054] Fig.13 for Fig.12 A schematic diagram of the local enlarged structure at C in the middle;

[0055] Fig.14 for Fig.11 Schematic diagram of the exploded structure of the insulating components and supporting components.

[0056] The reference numerals in the specific implementation manner are as follows:

[0057] 1000. Vehicles;

[0058] 100, battery; 200, controller; 300, motor;

[0059] 10. Box body; 11. First part; 12. Second part;

[0060] 20. Battery cell; 20', housing; 21. End cap; 21a. Electrode terminal; 22. Housing; 22a. First wall; 22b. Pressure relief mechanism; 22c. Second wall; 23. Electrode assembly; 23a. Tab; 23b. Main body; 23c. First end face; 24. Insulating member; 24a. First exhaust channel; 25. Support member; 25a. Second exhaust channel; 26. Insulating sheet; 27. Adapter sheet; 28. Bottom support plate; 29. ​​Wrapping paper;

[0061] 241, receiving groove; 242, bottom wall; 243, reinforcing portion; 244, boss; 251, opening; 252, first supporting portion; 253, second supporting portion;

[0062] 2411, first side wall; 2412, second side wall; 2413, third side wall; 2531, first sheet; 2532, second sheet;

[0063] H1, depth of the receiving groove; H2, height of the supporting member; L1, length of the receiving groove, L2, length of the supporting member; H3, height of the protrusion; X, first direction; Y, second direction. DETAILED DESCRIPTION

[0064] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0065] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0066] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0067] Reference to "embodiments" herein 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 herein may be combined with other embodiments.

[0068] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0069] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0070] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0071] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0072] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0073] Research on battery thermal runaway is becoming increasingly important. Battery thermal runaway refers to a cumulative enhancement of current and battery temperature and gradual damage when the battery is charged at a constant voltage. This is mainly due to the fact that the heat generation inside the battery is much higher than the heat dissipation rate, and a large amount of heat is accumulated inside the battery, causing a chain reaction, leading to battery fire and explosion. There are both internal and external factors that cause battery thermal runaway. Among them, the internal factors are mainly: internal short circuit caused by defects in battery production; improper use of batteries, resulting in the generation of lithium dendrites inside, causing short circuits between the positive and negative electrodes, etc. The external factors are mainly: external factors such as extrusion and puncture causing battery short circuits; external short circuits of batteries causing excessive accumulation of heat inside the battery, etc.

[0074] In order to reduce the risk of explosion in the state of thermal runaway of the battery, an explosion-proof valve is generally provided on the battery. In addition, an insulating component is generally provided between the electrode assembly of the battery and the explosion-proof valve. The insulating component is provided with an exhaust channel so that the gas on the electrode assembly side can quickly pass through the exhaust channel to the location of the explosion-proof valve in the state of thermal runaway, and exhaust is achieved through the explosion-proof valve, so that the pressure can be released in time during the thermal runaway process of the battery.

[0075] However, the current insulating components have a low melting point and are easily melted in a thermal runaway state. At the same time, the electrode assembly is easily moved toward the side of the explosion-proof valve under the impact of the high-pressure airflow in the battery casing, thereby abutting against the side wall of the battery cell equipped with the explosion-proof valve, closing the exhaust channel between the electrode assembly and the explosion-proof valve, and preventing the gas in the side cavity from quickly flowing to the bottom of the explosion-proof valve for exhaust, causing the side weld of the battery cell to burst, and high-temperature metal particles to spray to adjacent battery cells, causing heat spread.

[0076] In order to improve the above problems, an embodiment of the present application provides a battery cell, in which a first exhaust channel is provided in an insulating member, a support member having a higher melting point than the insulating member is added to the battery cell, and a second exhaust channel is provided in the support member. In this way, the structural reliability of the support member can be higher than that of the insulating member, and the battery cell can be exhausted to the location of the pressure relief mechanism through the first exhaust channel in the early stage of thermal runaway. After the first exhaust channel is melted in the late stage of thermal runaway, exhaust can be achieved with the help of the second exhaust channel, so that the battery cell provided in this embodiment can continue to maintain the connection between the side cavity and the pressure relief mechanism at various stages of thermal failure, so as to reduce the risk of cracking on the side of the battery cell and improve the safety of the battery cell.

[0077] The battery cell disclosed in the embodiments of the present application can be used in electrical devices that use batteries as power sources or various energy storage systems that use batteries as energy storage elements. Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, etc. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0078] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0079] Please refer to Figure 1 , Figure 1A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0080] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0081] Please refer to Figure 2 , Figure 2 An exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a box 10 and a battery cell 20, and the battery cell 20 is contained in the box 10. Among them, the box 10 is used to provide a storage space for the battery cell 20, and the box 10 can adopt a variety of structures. In some embodiments, the box 10 may include a first part 11 and a second part 12, the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define a storage space for accommodating the battery cell 20. The second part 12 may be a hollow structure with one end open, the first part 11 may be a plate-like structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a storage space; the first part 11 and the second part 12 may also be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12. Of course, the box 10 formed by the first part 11 and the second part 12 may be in a variety of shapes, such as a cylinder, a cuboid, etc. In some cases, the battery cells can also be directly installed in the vehicle without a box or shell, that is, there is no need to form a battery pack, and the structure of the vehicle body itself serves as a fixing structure for the battery cells.

[0082] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 10. The battery 100 may also include other structures, for example, the battery 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 20.

[0083] Each battery cell 20 may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0084] Please refer to Figure 3 , Figure 3 The schematic diagram of the exploded structure of the battery cell 20 provided in some embodiments of the present application. The battery cell 20 refers to the smallest unit that constitutes the battery. Figure 3 The battery cell 20 includes a shell 20', an electrode assembly 23 and other functional components. Among them, the shell 20' is a closed structure, which can form the internal environment of the battery cell 20, and generally includes an end cover 21 and a shell 22. The shell 22 and the end cover 21 can be two independent components. An opening can be set on the shell 22, and the shell 20' is formed by covering the opening with the end cover 21. Without limitation, the shell 20' can also be an integrated structure, that is, the end cover 21 and the shell 22 are integrated. Specifically, the end cover 21 and the shell 22 can form a common connection surface before other components are put into the shell. When the interior of the shell 22 needs to be encapsulated, the end cover 21 is covered with the shell 22.

[0085] Among them, the end cap 21 refers to a component that covers the opening of the shell 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 21 can be adapted to the shape of the shell 22 to match the shell 22. Optionally, the end cap 21 can be made of a material with a certain hardness and strength, such as an aluminum alloy, so that the end cap 21 is not easily deformed when squeezed and collided, so that the battery cell 20 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals 21a can be provided on the end cap 21. The electrode terminal 21a can be used to electrically connect to the electrode assembly 23 for outputting or inputting electrical energy of the battery cell 20. In some embodiments, the end cap 21 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The material of the end cap 21 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this. In some embodiments, an insulating member may be provided inside the end cap 21 to isolate the electrical connection components in the housing 22 from the end cap 21 to reduce the risk of short circuit. For example, the insulating member may be plastic, rubber, or the like.

[0086] The shell 22 is a component used to cooperate with the end cap 21 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 23, the electrolyte and other components. The shell 22 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 22 can be determined according to the specific shape and size of the electrode assembly 23. The material of the shell 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this.

[0087] The electrode assembly 23 is a component in the battery cell 100 where electrochemical reactions occur. One or more electrode assemblies 23 may be included in the housing 22. The electrode assembly 23 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly, and the parts of the positive and negative electrode sheets without active materials each constitute a tab 23a. The positive tab and the negative tab may be located together at one end of the main body or at both ends of the main body, respectively. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the tab 23a connects the electrode terminals to form a current loop.

[0088] like Figures 3 to 7As shown, the embodiment of the present application provides a battery cell 20, which includes a shell 20', an electrode assembly 23, an insulating member 24 and a supporting member 25. The shell 20' has a first wall 22a, a second wall 22c and a pressure relief mechanism 22b, and the pressure relief mechanism 22b is arranged on the first wall 22a. The first wall 22a and the second wall 22c are arranged to intersect. The electrode assembly 23 is arranged in the shell 20'. A first space a is formed between the outer peripheral wall of the electrode assembly 23 and the second wall 22c.

[0089] The insulating member 24 is disposed in the housing 20' and is located between the first wall 22a and the electrode assembly 23. A second space b is formed between the insulating member 24 and the pressure relief mechanism 22b. A first exhaust channel 24a is provided on the insulating member 24. The first exhaust channel 24a is the first space a and the second space b. The support member 25 is disposed in the housing 20' and is located between the first wall 22a and the insulating member 24. A second exhaust channel 25a is provided on the support member 25. The second exhaust channel 25a is used to connect the first space a and the second space b. Among them, the projection of the support member 25 on the insulating member 24 is located outside the first exhaust channel 24a, and the melting point of the support member 25 is greater than the melting point of the insulating member 24.

[0090] As mentioned above, the outer shell 20' is a closed structure, which is used to form the internal environment of the battery cell 20, and generally includes an end cover 21 and a shell 22. The shell 22 and the end cover 21 can be two independent components, or an integrated structure, which will not be repeated here. Among them, the shell 22 generally has multiple side walls and a bottom wall, and the end cover 21 is generally a single plate or a composite plate with a certain thickness. The first wall 22a can be a side wall in the shell 22 or the bottom wall of the shell 22, or it can be the end cover 21, which can be set according to the specific needs of use. The second wall 22c is one or more side walls connected to the first wall 22a. The pressure relief mechanism 22b can be an explosion-proof valve, or other mechanisms that can achieve pressure relief, such as setting a notch on the outer shell 20'. When the air pressure in the outer shell 20' is high, the gas can break through the notch to achieve pressure relief. At this time, the notch and the area surrounded by the notch are the pressure relief mechanism 22b.

[0091] The first exhaust channel 24a can be a hole, a microporous structure, an opening, etc. opened on the insulating member 24, and can be determined according to the use requirements. Through the first exhaust channel 24a, the gas located on the side where the main body 23b of the electrode assembly 23 is located (i.e., in the first space a) can flow to the space between the insulating member 24 and the first wall 22a (i.e., the second space b). Among them, the main body 23b of the electrode assembly 23 is the part of the electrode assembly 23 where the positive electrode sheet has an active material layer and the negative electrode sheet has an active material layer, and is also the part of the electrode assembly 23 except the tab 23a.

[0092] The support member 25 can be used to support between the main body of the electrode assembly 23 and the first wall 22a after at least part of the insulating member 24 is heat-melted, so that the gas on the side of the main body 23b of the electrode assembly 23 (i.e., the gas in the first space a) can flow to the location of the pressure relief mechanism 22b (i.e., the second space b) through the second exhaust channel 25a on the support member 25. Exemplarily, the support member 25 can be made of a material such as metal or ceramic having a melting point higher than that of the insulating member 24. The second exhaust channel 25a can be a hole, a microporous structure, an opening, etc. opened on the support member 25, which can be determined according to the specific needs of use. The second exhaust channel 25a is used to connect the first space a and the second space b, which means that in the initial state, that is, before the insulating member 24 is heat-melted, the second exhaust channel 25a can be blocked or exposed, as long as it can connect the first space a and the second space b after the insulating member 24 is heat-melted.

[0093] The projection of the support member 25 on the insulating member 24 is located outside the first exhaust channel 24a, which means that the projection area of ​​the support member 25 on the insulating member 24 falls outside the first exhaust channel 24a and does not overlap with the first exhaust channel 24a.

[0094] The melting point is the temperature at which a solid changes its physical state from solid to liquid. The melting point of the support member 25 is the temperature at which the physical state of the support member 25 changes from solid to liquid, and the melting point of the insulating member 24 is the temperature at which the physical state of the insulating member 24 changes from solid to liquid.

[0095] The exhaust method of the battery cell 20 provided in the embodiment of the present application in the thermal runaway state is as follows:

[0096] In the initial state, the second exhaust channel 25 a on the supporting member 25 may be exposed outside the insulating member 24 or may be blocked by the insulating member 24 .

[0097] In the early stage of thermal runaway, the insulating component 24 has not melted and the first exhaust channel 24a still exists. At this time, the gas on the side where the main body of the electrode assembly 23 is located (i.e., the gas in the first space a) can enter the second space b through the first exhaust channel 24a and reach the position of the pressure relief mechanism 22b, and exhaust is achieved through the pressure relief mechanism 22b.

[0098] In the middle and late stages of thermal runaway, when the temperature inside the housing 20' is greater than the melting point of the insulating member 24 but less than the melting point of the supporting member 25, the insulating member 24 melts, the first exhaust channel 24a disappears, and the second exhaust channel 25a is exposed. The supporting member 25 is supported between the electrode assembly 23 and the first wall 22a. The gas on the side where the main body of the electrode assembly 23 is located (i.e., the gas in the first space a) can enter the second space b through the second exhaust channel 25a and reach the location of the pressure relief mechanism 22b, and exhaust is achieved through the pressure relief mechanism 22b.

[0099] The battery cell 20 provided in the embodiment of the present application has a first exhaust channel 24a arranged in the insulating member 24, a support member 25 having a higher melting point than the insulating member 24 is added to the battery cell 20, and a second exhaust channel 25a is arranged in the support member 25. In this way, the structural reliability of the support member 25 can be higher than that of the insulating member 24, and the battery cell 20 can exhaust gas to the location of the pressure relief mechanism 22b through the first exhaust channel 24a at the early stage of thermal runaway. After the first exhaust channel 24a is melted in the late stage of thermal runaway, the exhaust gas can be achieved by means of the second exhaust channel 25a, so that the battery cell 20 provided in this embodiment can continue to maintain the connection between the side cavity and the pressure relief mechanism 22b at each stage of thermal failure, so as to reduce the risk of cracking of the side of the battery cell 20 and improve the safety of the battery cell 20. Among them, the projection of the support member 25 on the insulating member 24 is located outside the first exhaust channel 24a, which can avoid the support member 25 from blocking or shielding the first exhaust channel 24a, so as not to affect the discharge of gas in the housing 20' at the early stage of thermal runaway.

[0100] like Figure 3 As shown, in some embodiments, the first end surface 23c of the electrode assembly 23 is spaced apart from the second wall 22c in the first direction X, and at least a portion of the first space a is formed therebetween. The position of the support member 25 corresponds to the position of the first end surface 23c.

[0101] The first direction X may be a length direction of the electrode assembly 23 or a width direction of the electrode assembly 23 .

[0102] At least part of the first space a is formed between the two, including the following situations: first, the first space a is formed only between the end face of the electrode assembly 23 in the first direction X and the second wall 22c. At this time, the first end face 23c of the electrode assembly 23 in the first direction X and the second wall 22c form the entire second space; second, the first space a includes not only the space formed between the first end face 23c of the electrode assembly 23 in the first direction X and the second wall 22c, but also other spaces, such as the space formed between the other end faces of the electrode assembly 23 and the second wall 22c. At this time, the first end face 23c of the electrode assembly 23 in the first direction X and the second wall 22c form a part of the second space.

[0103] The position of the support member 25 corresponds to the position of the first end surface 23c, which means that the support member 25 is located above the first end surface 23c of the electrode assembly 23, which can be directly above or obliquely above, depending on the specific usage requirements.

[0104] By adopting the solution provided in this embodiment, the support member 25 can be located above at least a portion of the first space a, so that the gas in the first space a can quickly pass through the support member 25 into the second space under hot melting conditions, thereby achieving rapid exhaust.

[0105] like Figure 7 and Figure 8 As shown, in some embodiments, the support member 25 is spaced apart from the second wall 22c. The second exhaust channel 25a penetrates the support member 25 along the second direction Y. The second direction Y is parallel to the first direction X or is arranged at an angle to the first direction X.

[0106] The support member 25 and the second wall 22c are spaced apart, which means that they are not in contact with each other. After the insulating member 24 is at least partially melted, the first space a can be connected to the second exhaust channel 25a through the gap between the support member 25 and the second wall 22c, thereby achieving communication with the second space. The second direction Y can be a straight line direction or a curved line direction.

[0107] The second direction Y is parallel to the first direction X or is arranged at an angle to the first direction X, so that the gas in the first space a can quickly enter the second space through the second exhaust channel 25a after the insulating component 24 is thermally melted, thereby achieving rapid exhaust.

[0108] like Figure 3 As shown, in some embodiments, the first direction X is the length direction of the electrode assembly 23 .

[0109] Because under normal circumstances, the outer peripheral wall of the electrode assembly 23 is formed by connecting two end faces in the length direction and two end faces in the width direction end to end. The above four end faces are generally spaced apart from the second wall 22c of the shell 22. However, when the electrode assembly 23 is fully charged, the two end faces in the width direction of the electrode assembly 23 are generally in contact with the inner wall of the shell 22. At this time, only the two end faces in the length direction of the electrode assembly 23 are spaced apart from the inner wall of the shell 22. Therefore, the first direction X adopts the length direction of the electrode assembly 23, which can make the support member 25 located above the end face in the length direction of the electrode assembly 23, so that in the hot melt state, the gas in the first space a can enter the second exhaust channel 25a through a shorter path to achieve rapid exhaust.

[0110] like Figure 6 As shown, in some embodiments, the insulating member 24 is provided with a receiving groove 241 , and at least a portion of the supporting member 25 is located in the receiving groove 241 .

[0111] The receiving groove 241 is a groove body for receiving at least part of the support member 25, and can be directly prepared when preparing the insulating member 24, or can be prepared by cutting, stamping, etc. after the insulating member 24 is formed. The size of the receiving groove 241 can be prepared according to the size of the support member 25 and its use requirements.

[0112] By adopting the solution provided in this embodiment, the volume of the assembly of the insulating member 24 and the supporting member 25 can be reduced, which facilitates the miniaturization design of the battery cell 20 .

[0113] like Figure 6 As shown, in some embodiments, the entirety of the support member 25 is located within the receiving groove 241 .

[0114] Compared with a part of the support member 25 being located in the receiving groove 241 and the other part being located outside the receiving groove 241 , the solution provided in this embodiment can further reduce the volume of the assembly of the insulating member 24 and the support member 25 , facilitating the miniaturization design of the battery cell 20 .

[0115] like Figure 6 As shown, in some embodiments, the height of the support member 25 and the depth of the receiving groove 241 satisfy the following relationship:

[0116] H1 / H2=1.0-1.6;

[0117] Here, H1 is the depth of the receiving groove 241 , and H2 is the height of the supporting member 25 .

[0118] If the ratio of H1 / H2 is less than the above range, the depth of the receiving groove 241 is less than the height of the support member 25, that is, the size of the receiving groove 241 is small, and the support member 25 is not easy to operate when assembled to the receiving groove 241. If the ratio of H1 / H2 is greater than the above range, when the size of the receiving groove 241 is fixed, the size of the support member 25 will be small, which will easily limit the exhaust space of the support member 25 (that is, the exhaust space of the second exhaust channel 25a). Therefore, the solution provided in this embodiment can make the support member 25 easy to assemble and the exhaust space larger, which can meet the use needs and achieve multiple goals at one stroke.

[0119] like Figure 6 As shown, in some embodiments, the length dimension of the support member 25 and the length dimension of the receiving groove 241 satisfy the following relationship:

[0120] L1 / L2=1.0~1.3;

[0121] Wherein, L1 is the length of the receiving groove 241 , and L2 is the length of the supporting member 25 .

[0122] If the ratio of L1 / L2 is less than the above range, the depth of the receiving groove 241 is less than the height of the support member 25, that is, the size of the receiving groove 241 is small, and the support member 25 is not easy to operate when assembled to the receiving groove 241. If the ratio of L1 / L2 is greater than the above range, when the size of the receiving groove 241 is fixed, the size of the support member 25 will be small, which will easily limit the exhaust space of the support member 25 (that is, the exhaust space of the second exhaust channel 25a). Therefore, the solution provided in this embodiment can make the support member 25 easy to assemble and the exhaust space larger, which can meet the use needs and achieve multiple goals at one stroke.

[0123] like Figure 8 and Fig. 9 As shown, in some embodiments, the receiving groove 241 includes a first side wall 2411 , a second side wall 2412 and a third side wall 2413 .

[0124] The first side wall 2411 is parallel to the length direction of the support member 25. The second side wall 2412 is arranged opposite to the first side wall 2411 and is located on the side of the first side wall 2411 away from the center of the insulating member 24. Two third side walls 2413 are provided and are arranged at intervals. The first side wall 2411, the second side wall 2412 and the two third side walls 2413 are all arranged on the bottom wall 242, and together with the bottom wall 242, form a trough body with an open top.

[0125] Since the support member 25 is generally a body with a certain length, width, and thickness, in this embodiment, the first side wall 2411 and the second side wall 2412 are respectively arranged corresponding to the length direction of the support member 25, and the third side wall 2413 is arranged corresponding to the width direction of the support member 25. The first side wall 2411, the second side wall 2412, and the third side wall 2413 all have a certain thickness. Among them, the second side wall 2412 is located on the side of the first side wall 2411 away from the center of the insulating member 24, that is, located on the outside of the first side wall 2411.

[0126] The accommodating groove 241 adopts the structure provided in this embodiment, which has a simple structure and is easy to process.

[0127] like Fig. 9 As shown, in some embodiments, at least one end of the second side wall 2412 extends outside the slot body, protruding from the corresponding third side wall 2413 .

[0128] At least one end of the second side wall 2412 extends outside the tank body, which means that the length of the second side wall 2412 is greater than the interval between the two third side walls 2413, and at least one end of the second side wall 2412 protrudes from one of the third side walls 2413. The length of the second side wall 2412 refers to the size of the second side wall 2412 in the arrangement direction of the two third side walls 2413. At least one end of the second side wall 2412 is at least one end of the second side wall 2412 in its own length direction.

[0129] In this way, the size of the second side wall 2412 can be larger, so that the structure of the receiving groove 241 is stable.

[0130] In some embodiments, both ends of the second side wall 2412 extend outside the tank body, protruding from the corresponding three side walls 2413 .

[0131] In this way, the size of the second side wall 2412 can be larger, so that the structure of the receiving groove 241 is stable.

[0132] like Figure 3 and Fig. 9 As shown, in some embodiments, the battery cell 20 further includes an insulating sheet 26. The insulating sheet 26 is disposed in the housing 20'. The insulating sheet 26 is disposed around the electrode assembly 23 and is connected to the insulating member 24. The insulating sheet 26 is used to cooperate with the insulating member 24 to electrically isolate the housing 20' and the electrode assembly 23. The insulating sheet 26 is connected to the second side wall 2412.

[0133] The material of the insulating sheet 26 can be the same as the material of the insulating member 24, or it can be different from the material of the insulating member 24, as long as the insulating sheet 26 can cooperate with the insulating member 24 to achieve electrical isolation between the housing 20' and the electrode assembly 23. The insulating sheet 26 can be an integrally formed structure, or it can be composed of multiple sheets, which can be determined according to the use requirements.

[0134] The insulating sheet 26 is connected to the second side wall 2412 by hot-melt connection or by gluing or other methods.

[0135] By adopting the solution provided in this embodiment, the connection area between the insulating sheet 26 and the insulating member 24 can be made larger and the connection structure is stable.

[0136] like Figure 6 As shown, in some embodiments, the support member 25 is connected to the first wall 22a.

[0137] The support member 25 and the first wall 22a can be connected by welding, integral molding, or the like.

[0138] In this way, after the insulating member 24 is melted, the position of the supporting member 25 will not change, so that it can still be supported between the first wall 22a and the main body of the electrode assembly 23 to ensure the exhaust effect of the second exhaust channel 25a.

[0139] like Fig.10 As shown, in some embodiments, the support member 25 has an opening 251 disposed toward the bottom wall 242 , and the opening 251 is communicated with the second exhaust channel 25 a to form an exhaust cavity.

[0140] The opening 251 can be made by removing a part of the side wall of the second exhaust passage 25a after the support member 25 is formed, or can be directly formed on the support member 25 when the support member 25 is prepared. The opening 251 can connect the second sheet 2532 channel with the space outside the support member 25, and at the same time, the welding beam can enter the second exhaust passage 25a through the opening 251 to contact the part of the support member 25 that contacts the first wall 22a, so as to achieve welding of the support member 25 and the first wall 22a. Therefore, the solution provided in this embodiment is adopted to facilitate the welding operation of the support member 25 and the first wall 22a.

[0141] In some embodiments, the dimension of the opening 251 in at least one direction is greater than or equal to 3 mm.

[0142] In this way, the welding requirements between the support member 25 and the first wall 22a can be met, and the welding can be smoothly performed.

[0143] like Figures 6 to 9As shown, in some embodiments, a reinforcing portion 243 is provided on the bottom wall 242 of the receiving groove 241 , and the reinforcing portion 243 is used to enhance the mechanical strength of the bottom wall 242 .

[0144] The reinforcing portion 243 may be integrally formed on the bottom wall 242 of the receiving groove 241, or may be connected to the bottom wall 242 of the receiving groove 241 by plugging, bonding, etc. The reinforcing portion 243 may be one component or multiple components, and may be of a regular shape or an irregular shape, as long as the mechanical strength of the bottom wall 242 can be enhanced.

[0145] By adopting the solution provided in this embodiment, the mechanical strength of the bottom wall 242 , the receiving groove 241 and the insulating member 24 can be improved to a certain extent.

[0146] In some embodiments, the reinforcement portion 243 protrudes from the bottom wall 242 to form a convex portion, and the convex portion extends into the exhaust cavity through the opening 251 .

[0147] Since the reinforcing portion 243 and the bottom wall 242 are both components with a certain thickness or height, the reinforcing portion 243 protrudes from the bottom wall 242, including but not limited to the following situations: first, a portion of the reinforcing portion 243 is located inside the bottom wall 242, and the other portion is located outside the bottom wall 242, and the portion located outside the bottom wall 242 is located in the receiving groove 241, and the top surface is higher than the top surface of the bottom wall 242; second, the reinforcing portion 243 is entirely located in the receiving groove 241, and the bottom surface of the reinforcing portion 243 is connected to the top surface of the bottom wall 242.

[0148] The convex portion extends into the exhaust cavity through the opening 251 , which means that the convex portion is located in the coverage area of ​​the opening 251 on the support member 25 , and can be inserted into the second exhaust channel 25 a through the opening 251 after the support member 25 is inserted into the receiving groove 241 .

[0149] By adopting the solution provided in this embodiment, the height setting of the reinforcing portion 243 can be less affected by the supporting member 25 , so that the height of the reinforcing portion 243 is larger, and the reinforcing effect on the receiving groove 241 is better.

[0150] In some embodiments, the height H3 of the protrusion is greater than or equal to 0.5 mm and is smaller than the distance between the top surface of the exhaust cavity and the bottom wall 242 .

[0151] The height H3 of the convex portion refers to the dimension of the convex portion in the depth direction of the receiving groove 241. This height needs to take into account the assembly tolerance. The spacing between the top surface of the exhaust cavity and the bottom wall 242 refers to the vertical distance between the top surface of the exhaust cavity and the bottom wall 242.

[0152] Since the support member 25 is connected to the first wall 22a, after it is inserted into the receiving groove 241, there may be a gap between the bottom surface of the support member 25 and the bottom wall 242 of the receiving groove 241. By adopting the solution provided in this embodiment, the height H3 of the protrusion can be made larger, so that it has a better reinforcing effect on the structure of the receiving groove 241 and the insulating member 24. In addition, the protrusion will not abut against the support member 25 when it adopts the above-mentioned height range, so that the volume of the assembly composed of the support member 25 and the insulating member 24 will not be enlarged due to the existence of the protrusion, and the installation space of the electrode assembly 23 will not be squeezed, and multiple birds are achieved at one stroke.

[0153] like Fig. 9 As shown, in some embodiments, the protrusion is connected to two oppositely disposed side walls of the receiving groove 241 .

[0154] The two side walls opposite to each other in the receiving groove 241 are two side walls in the receiving groove 241 that are in contact with two ends of the protrusion and opposite to each other, such as the first side wall 2411 and the second side wall 2412 mentioned above.

[0155] By adopting the solution provided in this embodiment, the protrusion can be connected to the side wall of the accommodating groove 241. In this way, the setting of the reinforcing portion 243 can not only enhance the mechanical strength of the bottom wall 242 of the accommodating groove 241, but also enhance the mechanical strength of part of the side wall of the accommodating groove 241 to a certain extent, thereby making the structure of the accommodating groove 241 and the insulating component 24 more stable.

[0156] In some embodiments, the reinforcement portion 243 is integrally formed with the insulating member 24 .

[0157] The reinforcing portion 243 and the insulating member 24 in this embodiment can be manufactured by an integral molding process such as injection molding and stamping, so that the connection structure between the reinforcing portion 243 and the insulating member 24 can be stable and easy to process.

[0158] like Fig.10 As shown, in some embodiments, the support member 25 includes a first support portion 252 and a second support portion 253. The first support portion 252 is connected to the first wall 22a. The second support portion 253 is disposed between the first support portion 252 and the insulating member 24 and is connected to the first support portion 252. The second support portion 253 and the first support portion 252 enclose a second exhaust channel 25a.

[0159] The first support portion 252 and the second support portion 253 are both part of the support member 25, wherein the first support portion 252 is the portion of the support member 25 used to connect with the first wall 22a, and the second support portion 253 is the portion of the support member 25 that is not in contact with the first wall 22a and is located at the first support portion 252 away from the first wall 22a.

[0160] The first support portion 252 and the second support portion 253 may each consist of one component, such as a sheet or a plate, or may each consist of multiple components, such as two spaced-apart sheets or plates, etc., depending on the usage requirements.

[0161] The first support portion 252 and the second support portion 253 may be integrally formed, or may be two separately prepared components, which may be connected by welding, plugging, or the like.

[0162] The supporting member 25 adopts the structure provided in this embodiment, which is simple in structure and easy to process.

[0163] like Fig.10 As shown, in some embodiments, the second support portion 253 includes a first sheet 2531 and a second sheet 2532. The first sheet 2531 is disposed opposite to the first support portion 252. The second sheet 2532 connects the first sheet 2531 and the first support portion 252.

[0164] The first sheet 2531 and the second sheet 2532 are respectively a part of the second supporting portion 253 , and the two may be formed as one piece, or may be two separately prepared sheets connected by welding, plugging, or the like.

[0165] The second supporting portion 253 adopts the structure provided in this embodiment, which has a simple structure and is easy to process.

[0166] In some embodiments, the second sheet 2532 and the first sheet 2531 can be deformed under the action of an external force to enclose an exhaust channel with a triangular cross-section together with at least a portion of the first support portion 252 .

[0167] In this embodiment, the second sheet 2532 can be tilted toward the side where the first support portion 252 is located under the action of the upward thrust, so that the exhaust passage with a triangular cross section is formed with at least part of the first sheet 2531 and the first support portion 252. It can be understood that the above triangle can be a closed triangle or a triangle with an opening 251. The triangle with an opening 251 means that the second sheet 2532 is not in contact with the first support portion 252, and there is a gap between the two to form an opening 251.

[0168] By adopting the solution provided in this embodiment, in the case of thermal runaway, when the electrode assembly 23 moves toward the first wall 22a, the second sheet 2532 will not fit into the first support portion 252 to squeeze the second exhaust channel 25a away. Instead, the first sheet 2531, the second sheet 2532 and the first support portion 252 will form an exhaust channel with a triangular cross-section, thereby achieving stable support for the electrode assembly 23 and ensuring that the second exhaust channel 25a still exists. This can improve the safety of the use of the battery cell 20 in the case of thermal runaway to a certain extent.

[0169] In some embodiments, the second sheet 2532 and the first sheet 2531 are integrally formed, so that the connection structure between the second sheet 2532 and the first sheet 2531 is stable.

[0170] like Fig.10 As shown, in some embodiments, two second support portions 253 are provided, and the two second support portions 253 are spaced apart and disposed at two ends of the first support portion 252 .

[0171] The interval arrangement means that there is a certain interval between the two second support parts 253. The two second support parts 253 are arranged at both ends of the first support part 252 respectively.

[0172] By adopting the structure provided in this embodiment, the opening 251 can be formed between the two second supporting portions 253 to facilitate welding of the supporting member 25 and the first wall 22 a.

[0173] In some embodiments, the material of the support member 25 is the same as the material of the first wall 22a.

[0174] In general, the support member 25 is connected to the first wall 22a by welding. The solution provided in this embodiment is adopted to facilitate the welding operation between the support member 25 and the first wall 22a.

[0175] like Figure 8 As shown, in some embodiments, two groups of first exhaust channels 24a are provided, and the two groups of first exhaust channels 24a are respectively arranged on both sides of the pressure relief mechanism 22b, and two groups of support members 25 are also provided, and the two groups of support members 25 are arranged corresponding to the two groups of first exhaust channels 24a.

[0176] The corresponding arrangement is that one group of first exhaust channels 24a corresponds to one group of support members 25, that is, the two groups of support members 25 are also arranged on both sides of the pressure relief mechanism 22b.

[0177] Compared with the solution in which both the first exhaust channel 24a and the support member 25 are provided with a group, the solution provided in this embodiment can allow the gas on the side where the main body of the electrode assembly 23 is located to quickly reach the pressure relief mechanism 22b through the first exhaust channel 24a or the second exhaust channel 25a on the support member 25 in the event of thermal runaway, thereby making the battery cell 20 safer to use.

[0178] like Figure 8 As shown, in some embodiments, each group of first exhaust channels 24a includes two first exhaust channels 24a, and the two first exhaust channels 24a in the same group are arranged at intervals, and any group of support members 25 is arranged between the corresponding two first exhaust channels 24a.

[0179] For example, the two groups of first exhaust channels 24a are respectively the first group of exhaust channels and the second group of exhaust channels, and the two groups of support members 25 are respectively the first support member 25 and the second support member 25, wherein the first support member 25 corresponds to the first group of exhaust channels, and the second support member 25 corresponds to the second group of exhaust channels. Any of the above-mentioned groups of support members 25 is arranged between the two corresponding first exhaust channels 24a, which means that the first support member 25 is located between the two first exhaust channels 24a in the first group of exhaust channels, and the second support member 25 is located between the two second exhaust channels 25a in the second group of exhaust channels.

[0180] It should be noted that, in the present embodiment, a first exhaust channel 24a does not necessarily have only one exhaust channel. A first exhaust channel 24a may be composed of multiple exhaust channels. The multiple exhaust channels in the same first exhaust channel 24a may be connected or arranged at intervals.

[0181] By adopting the solution provided in this embodiment, the number of first exhaust channels 24a can be increased, which is convenient for rapid exhaust in the early stage of thermal runaway.

[0182] like Figures 11 to 14 As shown, in some embodiments, there is a gap between any group of first exhaust channels 24a and the side wall of the insulating member 24, and each group of support members 25 includes two support members 25, and the two support members 25 in the same group are arranged on both sides of the corresponding group of first exhaust channels 24a.

[0183] For example, the two groups of first exhaust channels 24a are respectively the first group of exhaust channels and the second group of exhaust channels, and the two groups of support members 25 are respectively the first group of support members 25 and the second group of support members 25, wherein the first group of support members 25 corresponds to the first group of exhaust channels, and the second group of support members 25 corresponds to the second group of exhaust channels. The two support members 25 in the same group are arranged on both sides of the corresponding group of first exhaust channels 24a, which means that the two support members 25 in the first group of support members 25 are respectively arranged on both sides of the first group of exhaust channels, and the two support members 25 in the second group of support members 25 are respectively arranged on both sides of the second group of exhaust channels.

[0184] By adopting the solution provided in this embodiment, the number of supporting members 25 is large, which is convenient for rapid exhaust in the later stage of thermal runaway.

[0185] like Fig.14 As shown, in some embodiments, the insulating member 24 has bosses 244 protruding toward the electrode assembly 23 at both ends in the length direction, and each boss 244 is provided with a group of first exhaust channels 24 a and a group of support members 25 .

[0186] The boss 244 is generally a block protruding from the side of the insulating member 24 facing the electrode assembly 23, and one or more bosses may be provided. The boss 244 may be integrally formed with the main body of the insulating member 24, or may be installed on the main body of the insulating member 24 by plugging, snapping, etc. The main body of the insulating member 24 refers to the portion of the insulating member 24 excluding the boss 244.

[0187] Since the accommodating groove 241 can accommodate the entire support member 25, and a second exhaust channel 25a is provided on the support member 25, the size of the support member 25 in the normal direction of the first wall 22a facing the side of the support member 25 is generally larger than the thickness of the main body of the insulating member 24. The solution provided in this embodiment can make the thickness of the main body of the insulating member 24 smaller, which is convenient for the lightweight design of the battery cell 20.

[0188] In some embodiments, support member 25 comprises a metal member.

[0189] The structure provided in this embodiment makes the supporting member 25 have a stable structure, a strong supporting strength and a high melting point.

[0190] In some embodiments, support member 25 is an integrally formed structure.

[0191] In this embodiment, the support member 25 can be manufactured by an integral forming process such as casting, molding, and bending.

[0192] The solution provided in this embodiment is adopted to ensure that the structure of the supporting member 25 is stable.

[0193] According to some embodiments of the present application, the present application also provides a battery, which includes the battery cell provided by any of the above embodiments.

[0194] The battery provided in the embodiments of the present application, including the battery cell provided in any of the above embodiments, can continuously maintain the connection between the side cavity of the battery cell and the pressure relief mechanism at various stages of thermal failure to reduce the risk of cracking on the side of the battery cell and improve the safety of the battery cell and the battery in use.

[0195] According to some embodiments of the present application, the present application further provides an electrical device, which includes the battery provided by any of the above embodiments.

[0196] The power-consuming device may be any of the aforementioned devices or systems using batteries.

[0197] The electrical device provided in the embodiments of the present application, including the battery provided in any of the above embodiments, can continuously maintain the connection between the side cavity of the battery cell and the pressure relief mechanism at various stages of thermal failure, so as to reduce the risk of cracking on the side of the battery cell and improve the safety of the battery cell, the battery and the electrical device.

[0198] Please refer to Figures 3 to 14 As shown, the embodiment of the present application embodies a battery cell 20. The battery cell 20 includes a shell 20', an electrode assembly 23, an insulating member 24 and a supporting member 25. The shell 20' has a first wall 22a, a second wall 22c and a pressure relief mechanism 22b, and the pressure relief mechanism 22b is arranged on the first wall 22a. The first wall 22a and the second wall 22c are arranged to intersect. The electrode assembly 23 is arranged in the shell 20'. A first space a is formed between the outer peripheral wall of the electrode assembly 23 and the second wall 22c.

[0199] The insulating member 24 is disposed in the housing 20' and is located between the first wall 22a and the electrode assembly 23. A second space b is formed between the insulating member 24 and the pressure relief mechanism 22b. A first exhaust channel 24a is provided on the insulating member 24. The first exhaust channel 24a communicates with the first space a and the second space b. The supporting member 25 is disposed in the housing 20' and is located between the first wall 22a and the insulating member 24. A second exhaust channel 25a is provided on the supporting member 25. The second exhaust channel 25a is used to communicate the first space a and the second space b.

[0200] The projection of the support member 25 on the insulating member 24 is located outside the first exhaust passage 24 a , and the melting point of the support member 25 is greater than the melting point of the insulating member 24 .

[0201] In some embodiments, the first wall 22a is an end cap 21, and the second wall 22c is one or more side walls connected to the first wall 22a. The pressure relief mechanism 22b is an explosion-proof valve. The first exhaust channel 24a can be a hole, a microporous structure, an opening, etc. opened on the insulating member 24, which can be determined according to the specific use requirements.

[0202] The first end surface 23c of the electrode assembly 23 in the first direction X is spaced apart from the second wall 22c, and at least a portion of the first space a is formed therebetween. The position of the support member 25 corresponds to the position of the first end surface 23c. The first direction X is the length direction of the electrode assembly 23. The support member 25 is spaced apart from the second wall 22c. The second exhaust channel 25a penetrates the support member 25 along the second direction Y. The second direction Y is parallel to the first direction X.

[0203] The support member 25 is welded to the first wall 22 a . The insulating member 24 is provided with a receiving groove 241 , and the entirety of the support member 25 is located in the receiving groove 241 .

[0204] The height of the supporting member 25 and the depth of the receiving groove 241 satisfy the following relationship:

[0205] H1 / H2=1.0-1.6;

[0206] Here, H1 is the depth of the receiving groove 241 , and H2 is the height of the supporting member 25 .

[0207] The length dimension of the supporting member 25 and the length dimension of the receiving groove 241 satisfy the following relationship:

[0208] L1 / L2=1.0~1.3;

[0209] Wherein, L1 is the length of the receiving groove 241 , and L2 is the length of the supporting member 25 .

[0210] The receiving groove 241 includes a first side wall 2411, a second side wall 2412 and a third side wall 2413. The first side wall 2411 is parallel to the length direction of the support member 25. The second side wall 2412 is arranged opposite to the first side wall 2411, and is located on the side of the first side wall 2411 away from the center of the insulating member 24. There are two third side walls 2413, and they are arranged at intervals. The first side wall 2411, the second side wall 2412 and the two third side walls 2413 are all arranged on the bottom wall 242, and together with the bottom wall 242, they form a groove body with an open top. Both ends of the second side wall 2412 extend out of the groove body, and the corresponding third side wall 2413 is protruded.

[0211] The battery cell 20 further includes an insulating sheet 26. The insulating sheet 26 is disposed in the housing 20'. The insulating sheet 26 is disposed around the electrode assembly 23 and is connected to the insulating member 24. The insulating sheet 26 is used to cooperate with the insulating member 24 to electrically isolate the housing 20' and the electrode assembly 23. The insulating sheet 26 is connected to the second side wall 2412. The insulating sheet 26 is generally mylar. Mylar refers to a tough polyester polymer.

[0212] The support member 25 includes a first support portion 252 and a second support portion 253. The first support portion 252 is connected to the first wall 22a. The second support portion 253 is disposed between the first support portion 252 and the insulating member 24, and is connected to the first support portion 252. The second support portion 253 and the first support portion 252 enclose a second exhaust passage 25a. The second support portion 253 includes a first sheet 2531 and a second sheet 2532. The first sheet 2531 is disposed opposite to the first support portion 252. The second sheet 2532 connects the first sheet 2531 and the first support portion 252. The second sheet 2532 and the first sheet 2531 can be deformed under the action of an external force to enclose an exhaust passage having a triangular cross section with at least part of the first support portion 252. Two second support portions 253 are provided, and the two second support portions 253 are disposed at intervals and are disposed at both ends of the first support portion 252. An opening 251 is formed between the two second support portions 253. The size of the opening 251 in at least one direction is greater than or equal to 3 mm.

[0213] A reinforcing portion 243 is provided on the bottom wall 242 of the receiving groove 241, and the reinforcing portion 243 is used to enhance the mechanical strength of the bottom wall 242. The reinforcing portion 243 protrudes from the bottom wall 242 to form a convex portion, and the convex portion extends into the second exhaust channel 25a through the opening 251. The height of the convex portion is greater than or equal to 0.5 mm and is less than the distance between the top surface of the exhaust cavity and the bottom wall 242. The convex portion is connected to two side walls arranged opposite to each other in the receiving groove 241. The reinforcing portion 243 is integrally formed with the insulating member 24.

[0214] There are two groups of first exhaust channels 24a, and the two groups of first exhaust channels 24a are disposed on both sides of the pressure relief mechanism 22b. There are also two groups of support members 25, and the two groups of support members 25 are disposed corresponding to the two groups of first exhaust channels 24a. In some embodiments, each group of first exhaust channels 24a includes two first exhaust channels 24a, and the two first exhaust channels 24a in the same group are disposed at intervals, and any group of support members 25 is disposed between the corresponding two first exhaust channels 24a. In other embodiments, there is an interval between any group of first exhaust channels 24a and the side wall of the insulating member 24, and each group of support members 25 includes two support members 25, and the two support members 25 in the same group are disposed on both sides of the corresponding group of first exhaust channels 24a.

[0215] The insulating member 24 has bosses 244 at both ends in the length direction, which protrude toward the electrode assembly 23 . Each boss 244 is provided with a group of first exhaust channels 24 a and a group of support members 25 .

[0216] The supporting member 25 is an integrally formed metal member formed by bending a sheet.

[0217] The supporting member 25 is mainly made of aluminum alloy material, preferably Al 3003H18, to facilitate welding with the end cover 21. The supporting member 25 is provided with two groups, which are respectively provided at both ends of the end cover 21 in the length direction.

[0218] By using the battery cell 20 provided in this embodiment, in the late stage of thermal runaway of the battery cell 20, when the insulating member 24 melts, the supporting member 25 can continue to conduct the side cavity and the bottom of the pressure relief mechanism 22b like a bridge that will not fall down until the thermal runaway process ends. This can reduce the risk of cracking of the side weld of the battery cell to a certain extent and improve the safety of the battery cell.

[0219] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: A housing having a first wall, a second wall and a pressure relief mechanism, wherein the pressure relief mechanism is arranged on the first wall, and the first wall and the second wall are arranged to intersect; An electrode assembly is disposed in the housing; a first space is formed between the outer peripheral wall of the electrode assembly and the second wall; an insulating member, disposed in the housing and between the first wall and the electrode assembly, a second space being formed between the insulating member and the pressure relief mechanism, and a first exhaust channel being provided on the insulating member; The first exhaust passage communicates with the first space and the second space; as well as a supporting member, disposed in the housing and between the first wall and the insulating member, wherein the supporting member is provided with a second exhaust passage, and the second exhaust passage is used to connect the first space and the second space; The projection of the supporting member on the insulating member is located outside the first exhaust channel, and the melting point of the supporting member is greater than the melting point of the insulating member.

2. The battery cell according to claim 1, characterized in that: The first end surface of the electrode assembly in the first direction is spaced apart from the second wall, and at least a portion of the first space is formed therebetween. The position of the support member corresponds to the position of the first end surface.

3. The battery cell according to claim 2, characterized in that: The support member is spaced apart from the second wall, and the second exhaust passage penetrates the support member along a second direction, and the second direction is parallel to the first direction or is arranged at an angle to the first direction.

4. The battery cell according to claim 2, characterized in that: The first direction is the length direction of the electrode assembly.

5. The battery cell according to any one of claims 1 to 4, characterized in that: The insulating member is provided with a receiving groove, and at least a portion of the supporting member is located in the receiving groove.

6. The battery cell according to claim 5, characterized in that: The entirety of the supporting member is located in the receiving groove.

7. The battery cell according to claim 5, characterized in that: The height of the supporting member and the depth of the receiving groove satisfy the following relationship: H1 / H2=1.0-1.6; Wherein, H1 is the depth of the receiving groove, and H2 is the height of the supporting member.

8. The battery cell according to claim 5, characterized in that: The length dimension of the supporting member and the length dimension of the receiving groove satisfy the following relationship: L1 / L2=1.0~1.3; Wherein, L1 is the length of the accommodating groove, and L2 is the length of the supporting member.

9. The battery cell according to claim 5, characterized in that: The receiving tank comprises: A first side wall, parallel to the length direction of the support member; a second side wall, disposed opposite to the first side wall and located on a side of the first side wall away from a center of the insulating member; and The third side walls are provided with two and are spaced apart from each other; The first side wall, the second side wall and the two third side walls are all arranged on the bottom wall of the accommodating groove, and together with the bottom wall, form a groove body with an open top.

10. The battery cell according to claim 9, characterized in that: At least one end of the second side wall extends outside the tank body and protrudes from the corresponding third side wall.

11. The battery cell according to claim 9, characterized in that: Both ends of the second side wall extend out of the slot body and protrude from the corresponding third side wall arrangement.

12. The battery cell according to any one of claims 9 to 11, characterized in that: The battery cell further comprises: An insulating sheet, disposed in the housing, the insulating sheet is disposed around the electrode assembly and connected to the insulating member, and the insulating sheet is used to cooperate with the insulating member to electrically isolate the housing and the electrode assembly; The insulating sheet is connected to the second side wall.

13. The battery cell according to claim 5, characterized in that: The support member is connected to the first wall.

14. The battery cell according to claim 13, characterized in that: The supporting member has an opening disposed toward a bottom wall of the accommodating groove, and the opening is communicated with the second exhaust passage to form an exhaust cavity.

15. The battery cell according to claim 14, characterized in that: The size of the opening in at least one direction is greater than or equal to 3 mm.

16. The battery cell according to claim 14, characterized in that: A reinforcement portion is provided on the bottom wall of the accommodating groove, and the reinforcement portion is used to enhance the mechanical strength of the bottom wall.

17. The battery cell according to claim 16, characterized in that: The reinforcement portion protrudes from the bottom wall to form a convex portion, and the convex portion extends into the exhaust cavity through the opening.

18. The battery cell according to claim 17, characterized in that: The height of the protrusion is greater than or equal to 0.5 mm and is smaller than the distance between the top surface of the exhaust cavity and the bottom wall.

19. The battery cell according to claim 17, characterized in that: The protrusion is connected to two side walls of the receiving groove that are arranged opposite to each other.

20. The battery cell according to any one of claims 16 to 19, characterized in that: The reinforcement portion is integrally formed with the insulating member.

21. The battery cell according to any one of claims 14 to 19, characterized in that: The supporting member comprises: A first supporting portion connected to the first wall; and The second supporting portion is disposed between the first supporting portion and the insulating component and connected to the first supporting portion. The second supporting portion and the first supporting portion form the second exhaust passage.

22. The battery cell according to claim 21, characterized in that The second supporting portion comprises: A first sheet body, disposed opposite to the first supporting portion; and The second sheet body connects the first sheet body and the first supporting part.

23. The battery cell according to claim 22, characterized in that: The second sheet and the first sheet can be deformed under the action of an external force to enclose an exhaust channel with a triangular cross section together with at least a portion of the first support portion.

24. The battery cell according to claim 22 or 23, characterized in that: The second sheet body is integrally formed with the first sheet body.

25. The battery cell according to claim 21, characterized in that There are two second supporting parts, and the two second supporting parts are arranged at intervals and respectively arranged at two ends of the first supporting part.

26. The battery cell according to claim 13, characterized in that: The material of the supporting member is the same as that of the first wall.

27. The battery cell according to claim 1, characterized in that: The first exhaust channels are provided with two groups, and the two groups of the first exhaust channels are respectively arranged on both sides of the pressure relief mechanism. The support members are also provided with two groups, and the two groups of the support members are arranged correspondingly to the two groups of the first exhaust channels.

28. The battery cell according to claim 27, characterized in that: Each group of the first exhaust channels includes two first exhaust channels, and the two first exhaust channels in the same group are arranged at an interval, and any group of the supporting members is arranged between the corresponding two first exhaust channels.

29. The battery cell according to claim 27, characterized in that There is a gap between any group of the first exhaust channels and the side wall of the insulating component. Each group of the support components includes two support components. The two support components in the same group are respectively arranged on both sides of the corresponding group of the first exhaust channels.

30. The battery cell according to any one of claims 27 to 29, characterized in that: The insulating member has bosses at both ends in the length direction that protrude toward the electrode assembly, and each of the bosses is provided with a group of the first exhaust channels and a group of the supporting members.

31. The battery cell according to any one of claims 1 to 4, characterized in that: The support member includes a metal member.

32. The battery cell according to any one of claims 1 to 4, characterized in that: The supporting member is an integrally formed structure.

33. A battery, characterized in that: A battery cell comprising any one of claims 1-32.

34. An electrical device, characterized in that: Comprising the battery of claim 33.

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