Battery cell, battery and electric device

Abstract

A battery cell (20), a battery (100) and an electric device relate to the technical field of batteries. The battery cell (20) includes a case (20 ') having a first wall (22a), a second wall (22c), a pressure relief mechanism (22b), and an electrode terminal (26), an electrode assembly (23) disposed within the case (20'), and a support member (25); a first space (a) is formed between the electrode assembly (23) and the first wall (22a), and a second space (b) is formed between the electrode assembly (23) and the second wall; the supporting component (25) is arranged in the shell (20 '), at least part of the supporting component (25) is located in the first space (a), the supporting component (25) is provided with a first exhaust channel (25a), the first exhaust channel (25a) is used for communicating the first space (a) with the second space (b), and at least part of a first projection (c) of the first exhaust channel (25a) on the second wall (22c) is located outside a second projection (d) of the electrode terminal (26) on the second wall (22c). The battery cell (20), the battery (100), and the electric device can realize rapid pressure relief.

Description

Battery cells, batteries and electrical devices Technical Field

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

[0002] During charging and discharging, batteries release heat due to electrochemical reactions. When the rate of heat release exceeds the rate of heat dissipation, thermal runaway occurs. Thermal runaway can cause battery bulging and even explosion. In related technologies, in the later stages of thermal runaway, insufficient venting can lead to problems such as side welds bursting open and high-temperature metal particles being ejected into adjacent battery cells, causing heat propagation.

[0003] Summary of the Invention

[0004] The purpose of this application is to provide a battery cell, a battery, and an electrical device, which aims to improve the technical problem of untimely venting in the later stages of thermal runaway. Technical solutions

[0005] The technical solution adopted in the embodiments of this application is:

[0006] In a first aspect, embodiments of this application provide a battery cell, comprising: a housing having a first wall, a second wall, a pressure relief mechanism, and electrode terminals, wherein the pressure relief mechanism and electrode terminals are both disposed on the first wall, and the electrode terminals and the pressure relief mechanism are arranged at intervals along a first direction, and the first wall and the second wall are intersecting; an electrode assembly disposed within the housing; a first space is formed between the electrode assembly and the first wall, and a second wall is disposed on one side of the electrode assembly along the first direction, and a second space is formed between the second wall and the electrode assembly; and a support member disposed within the housing, wherein at least a portion of the support member is located within the first space, and a first exhaust channel is provided on the support member; wherein, along the first direction, at least a portion of the first projection of the first exhaust channel on the second wall is located outside the second projection of the electrode terminals on the second wall.

[0007] The battery cell provided in this application embodiment has a support member between the electrode assembly and the first wall. Simultaneously, along the first direction, at least a portion of the first projection of the first venting channel on the second wall is located outside the second projection of the electrode terminals on the second wall. This allows at least a portion of the gas to reach the pressure relief mechanism without being blocked by the electrode terminals during the later stages of thermal runaway, thus achieving rapid pressure relief and reducing the risk of side cracking of the battery cell to some extent, thereby improving the safety of the battery cell. In some embodiments, the area of ​​the portion of the first projection outside the second projection is greater than or equal to 5 mm². 2This allows more gas to reach the pressure relief mechanism through the first exhaust channel, enabling rapid pressure relief of the battery cells in the event of thermal runaway, which can reduce the risk of side cracking of the battery cells to some extent.

[0008] In some embodiments, the electrode terminal includes a first connection portion and a second connection portion, at least a portion of the first connection portion is located within a first space and connected to the electrode assembly, at least a portion of the second connection portion is located outside the housing, and the second connection portion is connected to the first connection portion; along a first direction, at least a portion of the first projection is located outside the projection of the first connection portion on the second wall.

[0009] The solution provided in this embodiment has a simple electrode terminal structure and a small size in the direction perpendicular to the first direction, which allows for a smaller spacing between two support members in the same group, resulting in a compact battery cell structure.

[0010] In some embodiments, the electrode terminal further includes an adapter piece located within a first space, and a first connection portion connected to the electrode assembly via the adapter piece; along a first direction, the projection of the combined structure of the adapter piece and the first connection portion onto the second wall is a second projection.

[0011] The solution provided in this embodiment allows for a larger spacing between two support members located in the same group, which facilitates installation.

[0012] In some embodiments, the battery cell further includes: an insulating member disposed within the housing, with at least a portion of the insulating member located within the first space; the insulating member having a second exhaust channel; the second exhaust channel connecting the first space and the second space; and the insulating member having a third connecting portion, through which the insulating member is connected to the first wall. The third connecting portion allows for the fixation of the relative position between the insulating member and the first wall. On one hand, this facilitates the overall installation of the insulating member and the first wall onto other parts of the housing, improving the assembly efficiency of the battery cell; on the other hand, it prevents the position of the insulating member from shifting relative to the first wall during battery cell use. This ensures that the relative positions of the second exhaust channel, the pressure relief mechanism, the first space, and the second space remain relatively stable, allowing gas passing through the second exhaust channel to flow smoothly from the second space to the first space and the location of the pressure relief mechanism, thus stabilizing the performance of the battery cell.

[0013] In some embodiments, the third connecting portion is detachably connected to the first wall. This detachable connection facilitates the replacement or maintenance of the insulating components.

[0014] In some embodiments, the first wall has a first groove on the side facing the insulating member, and at least a portion of the third connecting part protrudes towards the first wall to form a plug-in portion, which is inserted into the first groove. The plug-in portion and the first groove enable the third connecting part to be plugged into and positioned with the first wall, facilitating the connection and separation of the third connecting part and the first wall.

[0015] In some embodiments, a second groove is provided on the sidewall of the first groove, and the second groove and the first groove form a combined groove for accommodating the third connecting part after heat fusion. The provision of the second groove allows the third connecting part to enter the combined groove formed by the first groove and the second groove as much as possible after heat fusion, thereby achieving a tight connection with the first wall.

[0016] In some embodiments, multiple second grooves are provided, and the multiple second grooves are spaced apart along the depth direction of the first groove. This can increase the amount of the third connecting part after heat fusion entering the assembly groove, and also increase the contact area between the third connecting part after heat fusion and the assembly groove, thereby stabilizing the connection between the third connecting part after heat fusion and the first wall.

[0017] In some embodiments, the position of the third connecting part corresponds to the position of the supporting member, and the supporting member is provided with a through hole for the third connecting part to pass through. Due to the limited width of the first wall, the solution provided in this embodiment allows the third connecting part and the supporting member to be located at the same or approximately the same position on the first wall, resulting in a compact structure within the battery cell that does not affect the installation of other structures. Furthermore, when the third connecting part is an insulator, in the event of thermal runaway of the battery cell, the third connecting part can be thermally melted and adhered between the supporting member and the first wall, reinforcing the connection between the supporting member and the first wall and reducing the risk of separation between the supporting member and the first wall in the event of thermal runaway of the battery cell.

[0018] In some embodiments, the size of the through hole is larger than the size of the third connector. This facilitates the passage of the third connector through the through hole, thereby improving the assembly efficiency of the battery cell.

[0019] In some embodiments, the through hole is a circular hole, and the third connecting part is a cylinder. Using a cylinder for the third connecting part, compared to using a prism structure, eliminates the need to consider the insertion angle when the third connecting part passes through the through hole, facilitating assembly. The circular shape of the through hole matches the shape of the third connecting part, making it easy for the third connecting part to pass through.

[0020] In some embodiments, the diameter of the third connecting part is 1mm-5mm. Using the dimensions provided in this embodiment, the third connecting part can have a certain supporting strength without affecting the installation of other components due to excessive size, while also ensuring a certain positioning effect, achieving multiple benefits.

[0021] In some embodiments, the inner diameter D2 of the through hole and the diameter D1 of the third connecting part satisfy: 0 < D2 - D1 ≤ 1 mm. The diameter of the through hole is within the range provided in this embodiment, which facilitates the passage of the third connecting part without making the size of the through hole too large, thus affecting the supporting strength of the supporting member.

[0022] In some embodiments, a reinforcing portion is provided on the third connecting portion to enhance its mechanical strength. Since the third connecting portion needs to possess a certain level of mechanical strength, the solution provided in this embodiment can improve its mechanical strength to a certain extent.

[0023] In some embodiments, the reinforcing portion includes an annular portion and a protrusion. The annular portion forms a closed structure around the outer peripheral wall of the third connecting portion, and the protrusion is disposed on the outer wall of the annular portion and connected to the insulating member. The annular portion connected to the outer peripheral wall of the third connecting portion can increase at least a portion of the thickness of the third connecting portion, thereby increasing the mechanical strength of the portion of the third connecting portion with the annular portion. The protrusion can further increase the local thickness of the annular portion and the third connecting portion, thereby increasing the local mechanical strength of the third connecting portion. Simultaneously, the protrusion and the insulating member can cooperate with the annular portion to achieve stable support for the third connecting portion.

[0024] In some embodiments, the insulating member is provided with a receiving groove, and at least a portion of the supporting member is located within the receiving groove. Using the solution provided in this embodiment, the combination of the insulating member and the supporting member can be made smaller in size, facilitating the miniaturization design of the battery cell.

[0025] In some embodiments, the reinforcing portion is located within the receiving groove and connected to the bottom wall of the receiving groove. This design ensures that the reinforcing portion does not significantly increase the thickness of the insulating member, resulting in a compact structure within the battery cell that does not occupy the original design space of the electrode assembly. Furthermore, the relative position of the reinforcing portion and the receiving groove is stable, thereby enhancing the mechanical strength of the third connection portion while providing better support.

[0026] In some embodiments, multiple protrusions are provided, spaced apart along the outer peripheral wall of the annular portion, and at least one protrusion is connected to the sidewall of the receiving groove. The multiple protrusions spaced apart along the outer peripheral wall of the annular portion allow the protrusions to provide support to the annular portion at multiple angles, thereby enabling the reinforcing portion to provide support to the third connecting portion at multiple angles. Simultaneously, the connection of at least one protrusion to the sidewall of the receiving groove further improves the connection stability between the reinforcing portion, the receiving groove, and the insulating member, while also strengthening the supporting effect of the reinforcing portion on the third connecting portion.

[0027] In some embodiments, the support member has an opening facing the bottom wall of the receiving groove, and the opening communicates with the first exhaust channel to form an exhaust chamber. The solution provided in this embodiment facilitates the welding operation between the support member and the first wall.

[0028] In some embodiments, at least a portion of the reinforcing portion is located within the exhaust chamber. This location minimizes the constraints imposed by the space between the supporting member and the bottom wall of the receiving groove, thereby ensuring that the reinforcing effect meets the usage requirements.

[0029] In some embodiments, the third connecting portion is integrally formed with the insulating member. This design ensures a stable connection between the third connecting portion and the insulating member and facilitates processing.

[0030] In some embodiments, the support member includes: a first support portion connected to a first wall; and a second support portion disposed on the side of the first support portion away from the first wall and connected to the first support portion, wherein the second support portion and the first support portion form a first exhaust channel. The support member adopts the structure provided in this embodiment, which is simple in structure and easy to process.

[0031] 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 in this embodiment, which is simple in structure and easy to manufacture.

[0032] In some embodiments, two second support portions are provided, spaced apart and located at opposite ends of the first support portion. The structure provided in this embodiment allows the aforementioned opening to be formed between the two second support portions, facilitating welding of the support member to the first wall.

[0033] In some embodiments, the support member is formed by bending a single sheet. This ensures a stable connection structure between the various parts of the support member. In some embodiments, the support member is connected to the first wall. This ensures that the position of the support member does not change after the insulating member is thermally melted, allowing it to remain supported between the first wall and the main body of the electrode assembly, thus guaranteeing the venting effect of the first venting channel.

[0034] In some embodiments, the support member is bonded to the first wall. Bonding the support member and the first wall can form a continuous surface connection between them, thereby reducing stress concentration, ensuring the strength of the support member and the first wall, improving the fatigue life of the support member and the first wall, and reducing the assembly cost of both.

[0035] In some embodiments, the melting point of the support member is greater than or equal to 300°C. A melting point greater than or equal to 300°C for the support member can meet the requirements for use in the event of thermal runaway of a single battery cell.

[0036] In some embodiments, the support member is welded to the first wall. Welding the support member to the first wall ensures a stable connection between the two, facilitates operation, and makes it easy to mechanize and automate.

[0037] In some embodiments, the melting point of the support member differs from that of the first wall by less than 100°C. This facilitates welding between the two.

[0038] In some embodiments, support members are provided at both opposite ends of the first space. Compared to providing a support member only at one location in the first space, the solution provided in this embodiment allows 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 on the support member in the event of thermal runaway. This results in higher safety for the battery cell and ensures good exhaust support on both sides of the electrode assembly to a certain extent.

[0039] In some embodiments, two support members are respectively provided at opposite ends of the first space, and the two support members at the same end are symmetrically arranged along a first center line along the length direction of the first wall. The solution provided in this embodiment facilitates the determination of the support member positions and the assembly of the support members.

[0040] Secondly, embodiments of this application provide a battery, including the battery cell provided in any of the above embodiments.

[0041] The battery provided in this application embodiment, including the battery cell provided in any of the above embodiments, can maintain the communication between the side cavity of the battery cell and the pressure relief mechanism at each stage of thermal failure, thereby achieving rapid pressure relief and reducing the risk of side cracking of the battery cell to a certain extent, thus improving the safety of the battery cell in use.

[0042] Thirdly, embodiments of this application provide an electrical device, including the battery provided in any of the above embodiments.

[0043] The electrical device provided in this application embodiment includes the battery provided in any of the above embodiments. It can maintain the communication between the side cavity of the battery cell and the pressure relief mechanism at each stage of thermal failure, so as to achieve rapid pressure relief, reduce the risk of side cracking of the battery cell, and improve the safety of the battery cell, battery and electrical device.

[0044] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or exemplary technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 is a structural schematic diagram of a vehicle provided in some embodiments of this application;

[0047] Figure 2 is an exploded structural diagram of a battery provided in some embodiments of this application;

[0048] Figure 3 is a schematic diagram of the exploded structure of a battery cell provided in some embodiments of this application;

[0049] Figure 4 is a partial cross-sectional structural diagram of a battery cell provided in some embodiments of this application;

[0050] Figure 5 is a schematic diagram of the structure of the insulating component in a battery cell provided in some embodiments of this application;

[0051] Figure 6 is a side view of the assembly structure of the first wall and supporting member in a battery cell provided in some embodiments of this application;

[0052] Figure 7 is a schematic cross-sectional view of a battery cell along the AA direction in Figure 6 provided in some embodiments of this application;

[0053] Figure 8 is a schematic diagram showing the positions of the first and second projections corresponding to a single battery cell provided in some embodiments of this application;

[0054] Figure 9 is a front view structural schematic diagram of the middle end cover of a battery cell provided in some embodiments of this application;

[0055] Figure 10 is a schematic diagram of the cross-sectional structure along the CC direction in Figure 9;

[0056] Figure 11 is a magnified view of part D in Figure 10;

[0057] Figure 12 is a side view of the assembly structure of the first wall, supporting member and insulating member in a battery cell provided in some embodiments of this application;

[0058] Figure 13 is a schematic cross-sectional view of a battery cell along the BB direction in Figure 12, provided in some embodiments of this application.

[0059] Figure 14 is a partial enlarged structural diagram of point A in Figure 13;

[0060] Figure 15 is a partial structural schematic diagram of the insulating component in a battery cell provided in some embodiments of this application;

[0061] Figure 16 is a schematic diagram of the structure of the support member in a battery cell provided in some embodiments of this application.

[0062] The reference numerals in the detailed embodiments are as follows: 1000, vehicle; 100, battery; 200, controller; 300, motor; 10, housing; 11, first part; 12, second part; 20, battery cell; 20', outer casing; 21, end cap; 22, housing; 22a, first wall; 22b, pressure relief mechanism; 22c, Second wall; 23, Electrode assembly; 23a, Tab; 23b, Main body; 24, Insulating member; 24a, Second exhaust channel; 24b, Receiving groove; 25, Support member; 25a, First exhaust channel; 25b, Through hole; 25c, Opening; 251, First support part; 252, Second support part; 2521, First sheet; 2522, Second sheet; 26, Electrode terminal; 26a, Electrode post; 26b, Adapter piece; 261, First connecting part; 262, Second connecting part; 27, Third connecting part; 271, Insertion part; 28a, First groove; 28b, Second groove; 29, Reinforcing part; 291, Annular part; 292, Protrusion; a, First space; b, Second space; c, First projection; d, Second projection; D1, Diameter of the third connecting part; D2, inner diameter of the through hole; X, first direction; Y, second direction; L1, first center line. Detailed Implementation

[0063] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0064] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0065] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0066] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0067] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0068] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0069] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0070] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0071] During charging and discharging, batteries release heat due to electrochemical reactions. When the rate of heat release exceeds the rate of heat dissipation, thermal runaway can occur. Thermal runaway can cause the battery to bulge or even explode.

[0072] To reduce the risk of explosion during battery thermal runaway, batteries are generally equipped with explosion-proof valves. In addition, there is usually an insulating component between the battery electrode assembly and the explosion-proof valve. The insulating component has an exhaust channel so that gas from the electrode assembly side can quickly reach the explosion-proof valve in the event of thermal runaway, and the gas can be vented through the explosion-proof valve to release pressure in a timely manner during battery thermal runaway.

[0073] However, the current insulating components have low melting points and are easily melted under thermal runaway conditions. At the same time, the electrode assembly is easily moved towards the side where the explosion-proof valve is located under the impact of the high-pressure gas flow inside the battery casing. This causes it to come into contact with the side wall of the battery cell where the explosion-proof valve is installed, thereby closing the exhaust channel between the electrode assembly and the explosion-proof valve. This prevents the gas in the side cavity from flowing quickly to the bottom of the explosion-proof valve for exhaust, causing the side weld of the battery cell to burst open. High-temperature metal particles are ejected to adjacent battery cells, causing heat spread.

[0074] To address these issues, related technologies attempt to add support components with melting points higher than the insulating components to the battery cells, and to incorporate venting channels within these support components. This allows for venting after the insulating components have melted during the later stages of thermal runaway. However, the design of these support components does not consider their positional relationship with the electrode terminals (such as terminals and adapters) within the battery. Consequently, gas vented through the venting channels on the support components to the explosion-proof valve is often blocked by the electrode terminals, resulting in delayed venting. This makes the battery still prone to problems such as side weld cracking, high-temperature metal particles being ejected into adjacent battery cells, and thermal propagation.

[0075] To address the aforementioned issues, this application provides a battery cell. This battery cell has an insulating member and a supporting member disposed between the electrode assembly and the first wall. Simultaneously, along a first direction, at least a portion of the first projection of the first venting channel on the second wall is located outside the second projection of the electrode terminals on the second wall. This allows the battery cell to vent gas via the first venting channel on the supporting member during the later stages of thermal runaway, ensuring that at least a portion of the gas reaches the pressure relief mechanism without being blocked by the electrode terminals, achieving rapid pressure relief. This, in turn, reduces the risk of side cracking of the battery cell to a certain extent, improving the safety of the battery cell in use.

[0076] The battery cells disclosed in this application can be used in electrical devices that use batteries as a power source or in 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, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0077] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0078] Please refer to Figure 1, which is a structural schematic diagram of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery 100 is disposed inside the vehicle 1000, and the battery 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000; for example, the battery 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0079] In some embodiments of this application, the battery 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0080] Please refer to Figure 2, which is an exploded structural diagram of a battery 100 provided in some embodiments of this application. The battery 100 includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. The housing 10 provides a space for the battery cell 20 and can adopt various structures. In some embodiments, the housing 10 may include a first portion 11 and a second portion 12, which overlap each other, jointly defining a space for accommodating the battery cell 20. The second portion 12 may be a hollow structure with one open end, and the first portion 11 may be a plate-like structure, covering the open side of the second portion 12 so that the first portion 11 and the second portion 12 jointly define the space. Alternatively, the first portion 11 and the second portion 12 may both be hollow structures with one open side, with the open side of the first portion 11 covering the open side of the second portion 12. Of course, the housing 10 formed by the first portion 11 and the second portion 12 can be of various shapes, such as a cylinder, a cuboid, etc. In some cases, battery cells can be directly installed in the vehicle without a casing or outer shell, meaning there is no need to form a battery pack; the vehicle's own structure serves as the fixing structure for the battery cells.

[0081] In battery 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, battery 100 can also be composed of multiple battery cells 20 first connected in series, parallel, or in a mixed manner to form a battery module, and then multiple battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 10. Battery 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 20.

[0082] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 20 can be cylindrical, flat, cuboid, or other shapes.

[0083] Please refer to Figure 3, which is an exploded structural diagram of a battery cell 20 provided in some embodiments of this application. A battery cell 20 refers to the smallest unit that makes up a battery. The battery cell 20 includes a casing 20', electrode assemblies 23, and other functional components. The casing 20' is a closed structure that forms the internal environment of the battery cell 20, and generally includes an end cap 21 and a housing 22. The housing 22 and the end cap 21 can be two independent components. An opening can be provided on the housing 22, and the end cap 21 can be used to close the opening to form the casing 20'. Alternatively, the casing 20' can also be an integrated structure, i.e., the end cap 21 and the housing 22 are integrated. Specifically, the end cap 21 and the housing 22 can form a common connecting surface before other components are inserted into the casing. When it is necessary to encapsulate the interior of the housing 22, the end cap 21 closes the housing 22.

[0084] In this context, end cap 21 refers to a component that covers the opening of housing 22 to isolate the internal environment of battery cell 20 from the external environment. The shape of end cap 21 can be adapted to the shape of housing 22 to fit it. Optionally, end cap 21 can be made of a material with certain hardness and strength, such as aluminum alloy. This makes end cap 21 less prone to deformation under pressure and impact, allowing battery cell 20 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 26 can be provided on end cap 21. Electrode terminals 26 can be used for electrical connection with electrode assembly 23 to output or input electrical energy to battery cell 20. In some embodiments, end cap 21 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of battery cell 20 reaches a threshold. The material of end cap 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this.

[0085] The housing 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 accommodate the electrode assembly 23, electrolyte, and other components. The housing 22 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 22 can be determined according to the specific shape and size of the electrode assembly 23. The material of the housing 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this.

[0086] Electrode assembly 23 is the component in the battery cell 100 where electrochemical reactions occur. The casing 22 may contain one or more electrode assemblies 23. The electrode assembly 23 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly, while the portions of the positive and negative electrode sheets without active material each constitute a tab 23a. The positive and negative tabs may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs 23a connect to the electrode terminals 26 to form a current loop.

[0087] As shown in Figures 3 to 7, Figure 4 is a partial cross-sectional structural diagram of a battery cell provided in some embodiments of this application; Figure 5 is a structural diagram of an insulating member in a battery cell provided in some embodiments of this application; Figure 6 is a side view structural diagram of the first wall and supporting member in a battery cell provided in some embodiments of this application; Figure 7 is a cross-sectional structural diagram of a battery cell provided in some embodiments of this application along the AA direction in Figure 6.

[0088] This application provides a battery cell 20. The battery cell 20 includes a housing 20', an electrode assembly 23, and a support member 25. The housing 20' has a first wall 22a, a second wall 22c, a pressure relief mechanism 22b, and electrode terminals 26. The pressure relief mechanism 22b and the electrode terminals 26 are both disposed on the first wall 22a. The electrode terminals 26 and the pressure relief mechanism 22b are arranged at intervals along a first direction X. The first wall 22a and the second wall 22c are intersecting. The electrode assembly 23 is disposed inside the housing 20'. A first space a is formed between the electrode assembly 23 and the first wall 22a. The second wall 22c is disposed on one side of the electrode assembly 23 along the first direction X, and a second space b is formed between the second wall 22c and the electrode assembly 23.

[0089] A support member 25 is disposed within the outer casing 20', and at least a portion of the support member 25 is located within the first space a. A first exhaust channel 25a is provided on the support member 25. The first exhaust channel 25a is used to connect the first space a and the second space b during the later stages of thermal runaway.

[0090] Wherein, along the first direction X, at least a portion of the first projection c of the first exhaust passage 25a on the second wall 22c is located outside the second projection d of the electrode terminal 26 on the second wall 22c.

[0091] As mentioned above, the outer casing 20' is a closed structure used to form the internal environment of the battery cell 20, and generally includes an end cap 21 and a housing 22. The housing 22 and the end cap 21 can be two independent components or an integrated structure, which will not be elaborated further here. The housing 22 generally has multiple side walls and a bottom wall, while the end cap 21 is generally a single plate or a combination plate with a certain thickness. The first wall 22a can be a side wall of the housing 22 or the bottom wall of the housing 22, or it can be the end cap 21, depending on the application requirements. The second wall 22c is one or more side walls connected to the first wall 22a.

[0092] The pressure relief mechanism 22b can be an explosion-proof valve or other mechanism that can achieve pressure relief, such as setting a groove on the outer casing 20'. When the gas pressure inside the outer casing 20' is high, the gas can break through the groove to achieve pressure relief. At this time, the groove and the area enclosed by the groove are the pressure relief mechanism 22b.

[0093] The electrode assembly 23 is a three-dimensional structure with a certain height, width, and length. The outer peripheral wall of the electrode assembly 23 includes two end walls in the height direction and a side wall connecting these two end walls. Generally, one of the two end walls is in contact with the outer casing 20', and the other end wall is spaced apart from the outer casing 20'. The first space a refers to the space formed between the end wall or side wall of the electrode assembly 23 that is opposite to and spaced apart from the first wall 22a, and the first wall 22a. The second space b refers to the space formed between all the end walls and / or side walls of the electrode assembly 23 that are opposite to and spaced apart from the second wall 22c, and the second wall 22c. For ease of understanding, the structure shown in Figure 3 will be used as an example for explanation. End cap 21 is the first wall 22a. One end wall of electrode assembly 23 is the bottom wall of electrode assembly 23, which is in contact with the bottom wall of housing 22. The other end wall of electrode assembly 23 is the top wall of electrode assembly 23, which is spaced apart from end cap 21. At this time, the first space a is the space between the top wall of electrode assembly 23 and end cap 21, and the second space b is the space between the side wall of electrode assembly 23 and the side wall of housing 22.

[0094] The support member 25 is used to support the electrode assembly 23's main body 23b and the first wall 22a after at least a portion of the insulating member 24 has been heat-melted, so that gas on the side where the electrode assembly 23's main body 23b is located (i.e., gas in the second space b) can flow through the first exhaust channel 25a on the support member 25 to the location of the pressure relief mechanism 22b. For example, the support member 25 can be made of a material such as metal or ceramic with a melting point higher than that of the insulating member 24. Generally, the melting point of the support member 25 is higher than that of the insulating member 24. The melting point is the temperature at which a solid changes its state of matter from solid to liquid. The melting point of the support member 25 is the temperature at which the support member 25 changes its state of matter from solid to liquid, and the melting point of the insulating member 24 is the temperature at which the insulating member 24 changes its state of matter from solid to liquid.

[0095] The first exhaust channel 25a can be a hole, micropore structure, opening, etc., formed on the supporting member 25, and the specific design can be determined according to the application requirements. The first exhaust channel 25a is used to connect the first space a and the second space b. In the initial state, that is, before the insulating member 24 is heat-melted, the first 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.

[0096] Electrode terminal 26 is a connection terminal that electrically connects the electrode assembly 23 and the external electrical components of the battery cell 20. It may include a terminal post 26a, an adapter piece 26b, etc., which can be determined according to the usage requirements. A part of the electrode terminal 26 is located in the first space a and connected to the electrode assembly 23, and another part extends through the first wall 22a to the outside of the outer casing 20'. The first direction X can be the length direction, height direction, or other direction of the first wall 22a, which can be determined according to the position of the first wall 22a and the layout of the battery cell 20. For example, when the first wall 22a is an end cap 21, the first direction X is generally the length direction of the first wall 22a; when the first wall 22a is a small surface of the casing 22 (i.e., the side with a smaller area in the side wall of the casing 22), the first direction X can be the height direction of the first wall 22a.

[0097] The first projection c of the first exhaust passage 25a on the second wall 22c refers to the projection of the first exhaust passage 25a along the first direction X on the second wall 22c. The second projection d of the electrode terminal 26 on the second wall 22c refers to the projection of the electrode terminal 26 along the first direction X on the second wall 22c.

[0098] It is understandable that, since the first exhaust channel 25a is a virtual structure such as a through hole 25b and a channel, the aforementioned first projection c is formed by the inner wall of the supporting member 25. That is, the projection of the inner wall of the supporting member 25 that forms the first exhaust channel 25a onto the second wall 22c is the outer contour of the first exhaust channel 25a. At least a portion of the first projection c of the first exhaust channel 25a onto the second wall 22c is located outside the second projection d of the electrode terminal 26 onto the second wall 22c, meaning that the area enclosed by the projection of the outer contour of the first exhaust channel 25a is at least partially located outside the projection area of ​​the electrode terminal 26 onto the second wall 22c. As shown in Figure 7, the area enclosed by the dashed frame L2 on the left half of the first exhaust channel 25a is located outside the outer contour line L3 of the electrode terminal 26.

[0099] The arrangement of the first projection c and the second projection d is shown in Figure 8. It can be understood that since the first exhaust channel 25a is a virtual structure such as a through hole 25b and a channel, the area corresponding to the first projection c is a transparent structure. The pattern filled in the first projection c in Figure 8 is an auxiliary line set to facilitate the observation of the range of the first projection c, and does not mean that there is a pattern or filling in that projection.

[0100] The venting method for the battery cell 20 under thermal runaway state provided in this application embodiment is as follows:

[0101] The battery cell 20 generally also has an insulating member 24 through which the battery cell 20 vents air before thermal runaway. In the initial state, the first venting channel 25a on the support member 25 can be exposed outside the insulating member 24 or can be blocked by the insulating member 24.

[0102] In the early stage of thermal runaway, the insulating component 24 has not melted, and the exhaust channel on the insulating component 24 (denoted as the second exhaust channel 24a) still exists. At this time, the gas on the side where the main body 23b of the electrode assembly 23 is located (i.e. the gas in the second space b) can enter the first space a through the second exhaust channel 24a and reach the location of the pressure relief mechanism 22b, and exhaust is achieved through the pressure relief mechanism 22b.

[0103] During the later stages of thermal runaway, when the temperature inside the outer casing 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 second exhaust channel 24a disappears, and the first exhaust channel 25a is exposed. The supporting member 25 is supported between the electrode assembly 23 and the first wall 22a, preventing the electrode assembly 23 from completely contacting the first wall 22a. Gas from the side where the main body 23b of the electrode assembly 23 is located (i.e., gas in the second space b) can then enter the first space a through the first exhaust channel 25a and reach the location of the pressure relief mechanism 22b, where it is vented. Furthermore, during this period, since at least a portion of the first projection c of the first exhaust channel 25a along the first direction X on the second wall 22c is located outside the second projection d of the electrode terminal 26 along the first direction X on the second wall 22c, the gas flowing from the first exhaust channel 25a to the pressure relief mechanism 22b is not completely blocked by the electrode terminal 26, and at least a portion of the gas can reach the pressure relief mechanism 22b without being obstructed.

[0104] The battery cell 20 provided in this application embodiment has a support member 25 between the electrode assembly 23 and the first wall 22a. At least a portion of the first projection c of the first exhaust channel 25a on the second wall 22c along the first direction X is located outside the second projection d of the electrode terminal 26 on the second wall 22c. In this way, when the battery cell 20 exhausts gas through the first exhaust channel 25a on the support member 25 in the later stage of thermal runaway, at least a portion of the gas can reach the location of the pressure relief mechanism 22b without being blocked by the electrode terminal 26, thereby achieving rapid pressure relief. This can reduce the risk of side cracking of the battery cell 20 to a certain extent and improve the safety of the battery cell 20 in use.

[0105] In some embodiments, the area of ​​the portion of the first projection located outside the second projection is greater than or equal to 5 mm². 2 .

[0106] This allows more gas to reach the pressure relief mechanism 22b through the first exhaust channel 25a, enabling the battery cell 20 to be depressurized quickly in the event of thermal runaway, which can reduce the risk of cracking on the side of the battery cell 20 to a certain extent.

[0107] As shown in Figures 9 to 11, in some embodiments, the electrode terminal 26 includes a first connecting portion 261 and a second connecting portion 262. At least a portion of the first connecting portion 261 is located within a first space and connected to the electrode assembly 23. At least a portion of the second connecting portion 262 is located outside the housing 20', and the second connecting portion 262 is connected to the first connecting portion 261.

[0108] Along the first direction, at least a portion of the first projection c is located outside the projection of the first connection portion 261 onto the second wall 22c.

[0109] The first connecting part 261 and the second connecting part 262 are each part of the aforementioned pole post 26a. The first connecting part 261 and the second connecting part 262 can be connected by screws, bolts, etc., or they can be connected directly by plugging, welding, etc., depending on the application requirements.

[0110] In this embodiment, the electrode terminal 26 may include only the electrode post 26a, or it may include other components in addition to the electrode post 26a, depending on the usage requirements.

[0111] Using the solution provided in this embodiment, the electrode terminal 26 has a simple structure and a small size in the direction perpendicular to the first direction X, which allows for a smaller spacing between the two support members 25 in the same group, making the battery cell 20 have a compact structure.

[0112] In some embodiments, the electrode terminal 26 further includes an adapter piece 26b. The adapter piece 26b is located within the first space, and the first connection portion 261 is connected to the electrode assembly 23 via the adapter piece 26b.

[0113] Along the first direction X, the projection of the combined structure of the adapter piece 26b and the first connecting part 261 onto the second wall 22c is the second projection.

[0114] The solution provided in this embodiment results in a larger spacing between two support members 25 located in the same group, which facilitates installation.

[0115] In some embodiments, the dimension of the pole post 26a in the second direction Y is 10mm-40mm. The second direction Y is perpendicular to the first direction X.

[0116] The electrode post 26a adopts the dimensions provided in this embodiment, which allows the electrode post 26a to have greater support strength, while not causing adverse effects on other structures within the battery cell 20 due to excessive size.

[0117] As shown in Figures 12 and 13, Figure 12 is a side view of the first wall, supporting member, and insulating member in a battery cell according to some embodiments of this application; Figure 13 is a cross-sectional view of the battery cell along the BB direction in Figure 12 according to some embodiments of this application. In some embodiments, the battery cell 20 further includes an insulating member. The insulating member 24 is disposed within the housing 20', and at least a portion of the insulating member 24 is located within the first space a. The insulating member 24 is provided with a second exhaust channel 24a. The second exhaust channel 24a connects the first space a and the second space b. The insulating member 24 is provided with a third connecting portion 27. The insulating member 24 is connected to the first wall 22a through the third connecting portion 27.

[0118] The insulating member 24 is a component used to isolate the main body 23b of the electrode assembly 23 from the first wall 22a to reduce the risk of battery short circuit. For example, the insulating member 24 can be made of plastic, rubber, etc. "At least a portion of the insulating member 24 is located within the first space a" means that the insulating member 24 can be entirely located within the first space a, or it can be partially located within the first space a and partially located outside the first space a.

[0119] The second exhaust channel 24a can be a hole, micropore structure, opening, etc., formed on the insulating member 24, and can be specifically determined according to the application requirements. Through the second 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 second space b) can flow into the space between the insulating member 24 and the first wall 22a (i.e., the first space a). The main body 23b of the electrode assembly 23 is the part of the electrode assembly 23 that has an active material layer on the positive electrode and the part of the electrode assembly 23 that has an active material layer on the negative electrode, and is also the part of the electrode assembly 23 excluding the tab 23a.

[0120] The third connecting part 27 is a component provided on the insulating member 24 for connecting with the first wall 22a. It can be integrally formed with the insulating member 24 or separately provided, depending on the application requirements. The third connecting part 27 can be fixedly connected to the first wall 22a or detachably connected to the first wall 22a, depending on the application requirements.

[0121] The third connecting part 27 can fix the relative position of the insulating member 24 and the first wall 22a. On the one hand, it is convenient for the insulating member 24 and the first wall 22a to be assembled and installed on other parts of the outer casing 20', so as to improve the assembly efficiency of the battery cell 20. On the other hand, it can make the position of the insulating member 24 less likely to move relative to the first wall 22a when the battery cell 20 is in use. This makes it less likely for the relative position of the second exhaust channel 24a, the pressure relief mechanism 22b, the first space a, and the second space b to change. This allows the gas passing through the second exhaust channel 24a to flow smoothly from the second space b to the first space a and the location of the pressure relief mechanism 22b, so as to stabilize the performance of the battery cell 20.

[0122] In some embodiments, the third connecting portion 27 is detachably connected to the first wall 22a.

[0123] A detachable connection means that the third connecting part 27 and the first wall 22a can be separated after installation without damaging their structure. The detachable connection methods include, but are not limited to, plug-in, snap-fit, and threaded connections.

[0124] The third connecting part 27 is detachably connected to the first wall 22a, which facilitates the replacement or maintenance of the insulating component 24.

[0125] As shown in Figures 13 and 14, Figure 14 is a partially enlarged structural diagram of point A in Figure 13. In some embodiments, the side of the first wall 22a facing the insulating member 24 is provided with a first groove 28a. At least a portion of the third connecting portion 27 protrudes towards the first wall 22a and forms a plug-in portion 271. The plug-in portion 271 is inserted into the first groove 28a.

[0126] The first groove 28a can be integrally formed on the first wall 22a, or it can be separately formed from the first wall 22a. When the first groove 28a is integrally formed on the first wall 22a, the first groove 28a can be formed during the preparation of the first wall 22a by casting, pouring, or other processes, or it can be formed after the first wall 22a is made by removing (e.g., by cutting) a portion of the structure of the first wall 22a. When the first groove 28a and the first wall 22a are separately formed, they can be prepared separately, and then connected by bonding, welding, or other processes after preparation.

[0127] The side of the insulating member 24 facing the first wall 22a can be a plane, a curved surface, or an irregular surface. For ease of description, the side of the insulating member 24 facing the first wall 22a will be referred to as the first surface. The statement that at least a portion of the third connecting portion 27 protrudes towards the first wall 22a means that when the first surface is a plane, at least a portion of the third connecting portion 27 protrudes from that plane; when the first surface is a curved surface, at least a portion of the third connecting portion 27 protrudes from the point on the curved surface closest to the first wall 22a.

[0128] It is understandable that the third connecting part 27 may or may not have elasticity. When the third connecting part 27 has elasticity, the insertion part 271 also has elasticity. In this case, the size of the insertion part 271 can be the same as or slightly larger than the size of the first groove 28a. When the third connecting part 27 does not have elasticity, the insertion part 271 also does not have elasticity. In this case, in order for the insertion part 271 to be smoothly inserted into the first groove 28a, the size of the insertion part 271 is generally smaller than the size of the first groove 28a.

[0129] The insertion part 271 and the first groove 28a enable the third connecting part 27 to be inserted into and positioned with the first wall 22a, facilitating the connection and separation of the third connecting part 27 and the first wall 22a.

[0130] In some embodiments, a second groove 28b is provided on the sidewall of the first groove 28a. The second groove 28b and the first groove 28a form a combined groove. The combined groove is used to accommodate the third connecting portion 27 after heat fusion.

[0131] The second groove 28b can be formed on the side wall of the first groove 28a after the first groove 28a is formed, or it can be integrally formed with the first groove 28a, depending on the application requirements. The second groove 28b communicates with the first groove 28a. The second groove 28b can be provided only on one side of the first groove 28a, or it can be provided around the first groove 28a.

[0132] The second groove 28b is provided so that after the third connecting part 27 is heat-melted, it can enter as much as possible into the combined groove formed by the first groove 28a and the second groove 28b, thereby achieving a tight connection with the first wall 22a.

[0133] In some embodiments, a plurality of second grooves 28b are provided. The plurality of second grooves 28b are spaced apart along the depth direction of the first groove 28a.

[0134] The depth direction refers to the vertical direction from the top to the bottom of the first groove 28a.

[0135] The shapes and sizes of the multiple second grooves 28b can be the same or different, depending on the application requirements. As shown in Figure 14, the shapes and sizes of the two second grooves 28b are different. In other embodiments, the shapes and sizes of the multiple second grooves 28b can be the same. This can increase the amount of the third connecting part 27 after heat fusion entering the combined groove, and also increase the contact area between the third connecting part 27 after heat fusion and the combined groove, thereby stabilizing the connection between the third connecting part 27 after heat fusion and the first wall 22a.

[0136] As shown in Figures 13 and 14, in some embodiments, the position of the third connecting portion 27 corresponds to the position of the supporting member 25, and the supporting member 25 is provided with a through hole 25b. The through hole 25b is used for the third connecting portion 27 to pass through.

[0137] The position of the third connecting part 27 corresponds to the position of the supporting member 25 in that, along the depth direction of the first groove 28a, at least a portion of the projection of the third connecting part 27 onto the first wall 22a is located within the projection of the supporting member 25 onto the first wall 22a.

[0138] The through hole 25b generally penetrates the support member 25 in a direction perpendicular to the first wall 22a, or it can penetrate the support member 25 in other directions that are at an angle to the above direction, as long as the third connecting part 27 can pass through the support member 25.

[0139] Since the width of the first wall 22a is limited, the solution provided in this embodiment allows the third connecting part 27 and the supporting member 25 to be located at the same or approximately the same position as the first wall 22a, making the structure within the battery cell 20 compact and not affecting the setting and installation of other structures. On the other hand, when the third connecting part 27 is an insulator, in the event of thermal runaway of the battery cell 20, the third connecting part 27 can be thermally melted and adhered between the supporting member 25 and the first wall 22a, reinforcing the connection between the supporting member 25 and the first wall 22a, thereby reducing the risk of separation between the supporting member 25 and the first wall 22a in the event of thermal runaway of the battery cell 20.

[0140] In some embodiments, the size of the through hole 25b is larger than the size of the third connecting portion 27.

[0141] The size of the through hole 25b being larger than the size of the third connecting portion 27 means that the size of the through hole 25b is larger than the size of the third connecting portion 27 in at least one direction. It is understood that the aforementioned direction refers to directions other than the insertion depth direction.

[0142] This facilitates the passage of the third connecting part 27 through the through hole 25b, thereby improving the assembly efficiency of the battery cell 20.

[0143] In some embodiments, the through hole 25b is a circular hole, and the third connecting part 27 is a cylinder.

[0144] The third connecting part 27 adopts a cylindrical shape, which, compared to a prism structure, allows the third connecting part 27 to pass through the through hole 25b without needing to pay attention to the insertion angle, facilitating assembly. The through hole 25b is a circular hole that matches the shape of the third connecting part 27, making it easy for the third connecting part 27 to pass through.

[0145] In some embodiments, the diameter D1 of the third connecting portion 27 is 1mm-5mm.

[0146] The third connecting part 27 adopts the dimensions provided in this embodiment, which can make the third connecting part 27 have a certain supporting strength and will not affect the installation of other components due to excessive size. At the same time, it can ensure a certain positioning effect, achieving multiple benefits.

[0147] In some embodiments, the inner diameter D2 of the through hole 25b and the diameter D1 of the third connecting portion 27 satisfy: 0 < D2 - D1 ≤ 1 mm.

[0148] The inner diameter of the through hole 25b is within the range provided in this embodiment, which facilitates the passage of the third connecting part 27 without making the size of the through hole 25b too large, thus affecting the support strength of the support member 25.

[0149] As shown in Figure 13, in some embodiments, the third connecting portion 27 is provided with a reinforcing portion 29. The reinforcing portion 29 is used to enhance the mechanical strength of the third connecting portion 27.

[0150] The reinforcing part 29 can be integrally formed on the third connecting part 27, or it can be connected to the third connecting part 27 by means of insertion, bonding, etc. The reinforcing part 29 can be one or more parts, and it can be a regular shape or an irregular shape, as long as it can enhance the mechanical strength of the third connecting part 27.

[0151] Since the third connecting part 27 needs to have a certain mechanical strength, the solution provided in this embodiment can improve the mechanical strength of the third connecting part 27 to a certain extent.

[0152] As shown in Figure 15, which is a partial structural schematic diagram of the insulating member in a battery cell provided in some embodiments of this application, in some embodiments, the reinforcing portion 29 includes an annular portion 291 and a protrusion 292. The annular portion 291 surrounds the outer peripheral wall of the third connecting portion 27 to form a closed structure. The protrusion 292 is provided on the outer wall of the annular portion 291 and is connected to the insulating member 24.

[0153] The annular portion 291 can be integrally formed with the third connecting portion 27, or it can be separately provided from the third connecting portion 27. The protrusion 292 can be integrally formed with the annular portion 291 and the insulating member 24, or it can be separately provided from the annular portion 291 and the insulating member 24. Furthermore, the annular portion 291 and the protrusion 292 can each be composed of a single component, or they can be composed of multiple components, depending on the application requirements. The protrusion 292 can be a raised ridge, a protrusion, etc., depending on the application requirements.

[0154] The annular portion 291 is connected to the outer peripheral wall of the third connecting portion 27, which can increase at least a portion of the thickness of the third connecting portion 27, thereby increasing the mechanical strength of the portion of the third connecting portion 27 with the annular portion 291. The protrusion 292 can further increase the local thickness of the annular portion 291 and the third connecting portion 27, thereby increasing the local mechanical strength of the third connecting portion 27. At the same time, the protrusion 292 and the insulating member 24 can cooperate with the annular portion 291 to achieve stable support for the third connecting portion 27.

[0155] In some embodiments, the insulating member 24 is provided with a receiving groove 24b. At least a portion of the support member 25 is located within the receiving groove 24b.

[0156] The receiving groove 24b is a groove used to accommodate at least a portion of the support member 25. It can be directly produced during the preparation of the insulating member 24, or it can be produced by cutting, stamping, or other methods after the insulating member 24 has been formed. The dimensions of the receiving groove 24b can be determined according to the dimensions of the support member 25 and its usage requirements.

[0157] The solution provided in this embodiment can make the combination of insulating member 24 and supporting member 25 smaller in size, which facilitates the miniaturization design of battery cell 20.

[0158] In some embodiments, the reinforcing part 29 is located within the receiving groove 24b and is connected to the bottom wall of the receiving groove 24b.

[0159] The receiving groove 24b is a three-dimensional space with a certain height, length, and width, and is surrounded by a bottom wall and multiple side walls. The bottom wall is the surface of the surface surrounding the receiving groove 24b that faces the first wall 22a.

[0160] Since the annular portion 291 and the protrusion 292 in the reinforcing portion 29 can be integrally formed with the insulating member 24 or separately provided with the insulating member 24, the connection between the reinforcing portion 29 and the bottom wall of the receiving groove 24b can be achieved by at least one of the annular portion 291 and the protrusion 292 being connected to the bottom wall of the receiving groove 24b, and there are various connection methods. For example, when the annular portion 291 and the protrusion 292 are integrally formed with the insulating member 24, at least one of the annular portion 291 and the protrusion 292 is integrally connected with the bottom wall of the receiving groove 24b; when the part of the annular portion 291 and the protrusion 292 that is connected to the insulating member 24 is separately provided with the insulating member 24, the two can be connected by means of gluing, welding, plugging, etc.

[0161] The reinforcing part 29 is located inside the receiving groove 24b and is connected to the bottom wall of the receiving groove 24b. This makes it easy to avoid increasing the thickness of the insulating member 24, resulting in a compact structure within the battery cell that does not occupy the original design space of the electrode assembly. At the same time, the relative position of the reinforcing part 29 and the receiving groove 24b is stable, thereby strengthening the mechanical strength of the third connecting part 27 while providing better support for the third connecting part 27.

[0162] In some embodiments, a plurality of protrusions 292 are provided. The plurality of protrusions 292 are spaced apart along the outer peripheral wall of the annular portion 291, and at least one protrusion 292 is connected to the side wall of the receiving groove 24b.

[0163] As mentioned above, the receiving groove 24b is formed by a bottom wall and multiple side walls. The side walls in the connection between at least one protrusion 292 and a side wall of the receiving groove 24b refer to any one or more side walls that form the receiving groove 24b, which can be determined according to the usage requirements. It is understood that when multiple protrusions 292 are connected to multiple side walls respectively, and when the same protrusion 292 is connected to multiple side walls, the supporting strength of the reinforcing part 29 is greater than the supporting strength when a single protrusion 292 is connected to a single side wall.

[0164] The protrusions 292 are provided in multiple portions and spaced apart along the outer peripheral wall of the annular portion 291, so that the protrusions 292 can provide support for the annular portion 291 at multiple angles, thereby enabling the reinforcing portion 29 to provide support for the third connecting portion 27 at multiple angles. At the same time, at least one protrusion 292 is connected to the side wall of the receiving groove 24b, which can further improve the connection stability between the reinforcing portion 29, the receiving groove 24b, and the insulating member 24, and at the same time strengthen the supporting effect of the reinforcing portion 29 on the third connecting portion 27.

[0165] In some embodiments, the support member 25 has an opening 25c disposed toward the bottom wall of the receiving groove 24b, and the opening 25c communicates with the first exhaust passage 25a to form an exhaust chamber.

[0166] The opening 25c can be formed after the support member 25 is formed by removing a portion of the sidewall of the first exhaust channel 25a, or it can be directly formed on the support member 25 during its fabrication. This opening 25c connects the first exhaust channel 25a to the space outside the support member 25. Simultaneously, through this opening 25c, a welding beam can enter the first exhaust channel 25a and partially contact the first wall 22a of the support member 25, thereby achieving welding between the support member 25 and the first wall 22a. Therefore, the solution provided in this embodiment facilitates the welding operation between the support member 25 and the first wall 22a.

[0167] In some embodiments, at least a portion of the reinforcing portion 29 is located within the exhaust chamber.

[0168] Understandably, to facilitate the entry of the reinforcing part 29 into the first exhaust passage 25a through the opening 25c, the cross-sectional dimension of the opening 25c is generally larger than the cross-sectional dimension of the reinforcing part 29. For example, if the opening 25c is rectangular and the reinforcing part 29 is cylindrical, the width of the opening 25c is greater than the diameter of the reinforcing part 29. Since at least a portion of the reinforcing part 29 is located within the exhaust chamber, the arrangement of the reinforcing part 29 is less restricted by the space between the supporting member 25 and the bottom wall of the receiving groove 24b, thereby ensuring that the reinforcing effect of the reinforcing part 29 meets the usage requirements.

[0169] In some embodiments, the third connecting portion 27 is integrally formed with the insulating member 24.

[0170] The third connecting part 27 and the insulating member 24 are integrally formed, meaning that the third connecting part 27 and the insulating member 24 are combined together in one machining or casting process to form a complete article. This approach ensures a stable connection between the third connecting part 27 and the insulating member 24 and facilitates machining.

[0171] As shown in Figure 16, in some embodiments, the support member 25 includes a first support portion 251 and a second support portion 252. The first support portion 251 is connected to the first wall 22a. The second support portion 252 is disposed on the side of the first support portion 251 opposite to the first wall 22a and is connected to the first support portion 251. The second support portion 252 and the first support portion 251 form a first exhaust channel 25a.

[0172] The first support portion 251 and the second support portion 252 are both part of the support member 25, wherein the first support portion 251 is the part of the support member 25 used to connect with the first wall 22a, and the second support portion 252 is the part of the support member 25 that does not contact the first wall 22a and is located away from the first wall 22a in the first support portion 251.

[0173] The first support part 251 and the second support part 252 can each be composed of a single component, such as a sheet or plate, or they can each be composed of multiple components, such as two spaced-apart sheets or plates, depending on the specific application requirements.

[0174] The first support part 251 and the second support part 252 can be integrally formed or they can be two separately manufactured parts that can be connected by welding, plugging or other methods.

[0175] The supporting component 25 adopts the structure provided in this embodiment, which is simple and easy to process.

[0176] As shown in Figure 16, in some embodiments, the second support portion 252 includes a first sheet 2521 and a second sheet 2522. The first sheet 2521 is disposed opposite to the first support portion 251. The second sheet 2522 connects the first sheet 2521 and the first support portion 251.

[0177] The first piece 2521 and the second piece 2522 are each part of the second support 252. They can be integrally formed or they can be two separately prepared pieces connected by welding, plugging or other methods.

[0178] The second support part 252 adopts the structure provided in this embodiment, which is simple and easy to process.

[0179] In some embodiments, the second piece 2522 and the first piece 2521 can deform under external force to form an exhaust channel with a triangular cross-section, together with at least a portion of the first support portion 251.

[0180] In this embodiment, the second piece 2522 can tilt towards the side where the first support 251 is located under the action of an upward thrust, thereby forming an exhaust channel with at least a portion of the first piece 2521 and the first support 251, which has a triangular cross-section. It is understood that the triangle can be a closed triangle or a triangle with an opening 25c. A triangle with an opening 25c means that the second piece 2522 and the first support 251 are not in contact, and there is a gap between them forming an opening 25c.

[0181] By adopting the solution provided in this embodiment, when the electrode assembly 23 moves toward the first wall 22a in the event of thermal runaway, the second sheet 2522 will not come into contact with the first support portion 251 to squeeze the first exhaust channel 25a out. Instead, the first sheet 2521, the second sheet 2522 and the first support portion 251 will form an exhaust channel with a triangular cross-section, thereby achieving stable support for the electrode assembly 23 and ensuring that the first exhaust channel 25a still exists. This can improve the safety of the battery cell 20 in the event of thermal runaway to a certain extent.

[0182] As shown in Figure 16, in some embodiments, there are two second support portions 252, which are spaced apart and located at both ends of the first support portion 251.

[0183] "Interval setting" means that there is a certain interval between the two second support parts 252. "Distributed at both ends of the first support part 251" means that the two second support parts 252 are respectively disposed at the two ends of the first support part 251 in the length direction.

[0184] The structure provided in this embodiment allows the opening 25c to be formed between the two second support portions 252, so as to facilitate the welding of the support member 25 to the first wall 22a.

[0185] In some embodiments, the support member 25 is formed by bending a single sheet. This ensures a stable connection structure between the various parts of the support member.

[0186] In some embodiments, the support member 25 is connected to the first wall 22a.

[0187] The supporting member 25 and the first wall 22a can be connected by welding, integral molding or other methods.

[0188] This ensures that the position of the supporting member 25 does not change after the insulating member 24 is heat-melted, so that it can still be supported between the first wall 22a and the main body 23b of the electrode assembly 23, thus ensuring the exhaust effect of the first exhaust channel 25a.

[0189] In some embodiments, the support member 25 is bonded to the first wall 22a.

[0190] Adhesion is a method of firmly connecting the support member 25 to the first wall 22a by using the adhesive force generated on a solid surface through an adhesive. In this embodiment, the support member 25 and the first wall 22a can be made of the same material or different materials.

[0191] The bonding of the support member 25 and the first wall 22a can form a continuous surface connection between them, thereby reducing stress concentration, ensuring the strength of the support member 25 and the first wall 22a, improving the fatigue life of the support member 25 and the first wall 22a, and reducing the assembly cost of the two.

[0192] In some embodiments, the melting point of the support member 25 is greater than or equal to 300°C.

[0193] The melting point of the support component 25 is greater than or equal to 300°C, which can meet the usage requirements under the condition of thermal runaway of the battery cell 20.

[0194] In some embodiments, the support member 25 is welded to the first wall 22a.

[0195] Welding is the process of joining metals or other thermoplastic materials (such as plastics) together by heating, high temperature, or high pressure. In this embodiment, the supporting member 25 and the first wall 22a are generally made of metal, but can also be made of other thermoplastic materials (such as plastics). The materials of the two can be the same or different, depending on the application requirements.

[0196] The support member 25 is welded to the first wall 22a, which makes the connection between the two stable, convenient to operate, and easy to realize mechanization and automation.

[0197] In some embodiments, the melting point of the support member 25 differs from the melting point of the first wall 22a by less than 100°C.

[0198] In this embodiment, both the support member 25 and the first wall 22a can be made of metal materials with a melting point difference of less than 100°C, which facilitates the welding operation of the two.

[0199] In some embodiments, support members 25 are provided at both opposite ends of the first space a.

[0200] Since the side of the first wall 22a facing the electrode assembly 23 is generally a rectangular surface with a certain length and width, and the side of the electrode assembly 23 facing the first wall 22a can also be approximated as a rectangular surface with a certain length and width, then the first space a can be approximated as a cube structure. The opposite ends of the first space a refer to the two ends in the length direction of the first space a.

[0201] Compared to setting the support member 25 only at one location in the first space a, the solution provided in this embodiment allows the gas on the side where the main body 23b of the electrode assembly 23 is located to quickly reach the pressure relief mechanism 22b through the first exhaust channel 25a on the support member 25 in the event of thermal runaway. This makes the battery cell 20 safer to use and can ensure good exhaust support on both sides of the electrode assembly to a certain extent.

[0202] In some embodiments, two support members 25 are provided at opposite ends of the first space a, and the two support members 25 at the same end are symmetrically arranged along the first center line L1 along the length direction of the first wall 22a.

[0203] The solution provided in this embodiment facilitates the determination of the position of the support member 25 and the assembly of the support member 25.

[0204] In some embodiments, the third connecting portion 27 is integrally formed with the insulating member 24.

[0205] The third connecting part 27 and the insulating component 24 can be manufactured using integral molding processes such as casting, molding, and bending. Integrating the two together ensures a stable connection and facilitates processing.

[0206] According to some embodiments of this application, this application also provides a battery, including a battery cell 20 of any of the above schemes.

[0207] The battery provided in this application embodiment, including the battery cell 20 provided in any of the above embodiments, can maintain the communication between the side cavity of the battery cell 20 and the pressure relief mechanism 22b at various stages of thermal failure, thereby achieving rapid pressure relief and reducing the risk of side cracking of the battery cell 20 to a certain extent, thus improving the safety of the battery cell 20 in use.

[0208] According to some embodiments of this application, this application also provides an electrical device including a battery of any of the above-described schemes, and the battery is used to provide electrical energy to the electrical device.

[0209] The electrical device can be any of the aforementioned battery-powered devices or systems.

[0210] The electrical device provided in this application embodiment includes the battery provided in any of the above embodiments. It can maintain the communication between the side cavity of the battery cell 20 and the pressure relief mechanism 22b at each stage of thermal failure, so as to achieve rapid pressure relief, reduce the risk of side cracking of the battery cell 20, and improve the safety of the battery cell 20, the battery and the electrical device.

[0211] As shown in Figures 3 to 16, according to some embodiments of this application, a battery cell 20 is provided. The battery cell 20 includes a housing 20', an electrode assembly 23, an insulating member 24, a support member 25, and electrode terminals 26. The housing 20' has a first wall 22a, a second wall 22c, and a pressure relief mechanism 22b. The pressure relief mechanism 22b is disposed on the first wall 22a. The first wall 22a and the second wall 22c intersect. The electrode assembly 23 is disposed within the housing 20'. A first space a is formed between the outer peripheral wall of the electrode assembly 23 and the first wall 22a, and a second space b is formed between the outer peripheral wall of the electrode assembly 23 and the second wall 22c. The insulating member 24 is disposed within the housing 20', and at least a portion of the insulating member 24 is located within the first space a. A second venting channel 24a is provided on the insulating member 24. The second venting channel 24a connects the first space a and the second space b.

[0212] A support member 25 is disposed within the outer casing 20', and at least a portion of the support member 25 is located within the first space a. A first exhaust passage 25a is provided on the support member 25. The first exhaust passage 25a connects the first space a and the second space b.

[0213] Electrode terminals 26 are disposed on the first wall 22a and are spaced apart from the pressure relief mechanism 22b along the first direction X. A portion of the electrode terminals 26 is located in the first space a and connected to the electrode assembly 23, while another portion extends through the first wall 22a to the outside of the housing 20'.

[0214] Specifically, along the first direction X, at least a portion of the first projection of the first exhaust channel 25a onto the second wall 22c lies outside the second projection of the electrode terminal 26 onto the second wall 22c. Furthermore, the area of ​​the portion of the first projection outside the second projection is greater than or equal to 5 mm². 2 .

[0215] The insulating member 24 is provided with a third connecting portion 27 that connects to the first wall 22a. The side of the first wall 22a facing the insulating member 24 is provided with a first groove 28a. At least a portion of the third connecting portion 27 protrudes from the side of the insulating member 24 facing the first wall 22a to form a plug-in portion 271. The plug-in portion 271 is inserted into the first groove 28a.

[0216] A second groove 28b is provided on the side wall of the first groove 28a. The second groove 28b and the first groove 28a form a combined groove. The combined groove is used to accommodate the third connecting part 27 after heat fusion. There are multiple second grooves 28b. The multiple second grooves 28b are spaced apart along the depth direction of the first groove 28a.

[0217] The third connecting part 27 is positioned corresponding to the supporting member 25. The supporting member 25 has a through hole 25b for the third connecting part 27 to pass through. The third connecting part 27 is cylindrical. The diameter D1 of the third connecting part 27 is 1mm-5mm. The cross-section of the through hole 25b is circular, and the inner diameter of the through hole 25b satisfies: 0<D2-D1≤1mm, where D2 is the inner diameter of the through hole 25b.

[0218] The third connecting portion 27 is provided with a reinforcing portion 29. The reinforcing portion 29 is used to enhance the mechanical strength of the third connecting portion 27. The reinforcing portion 29 includes an annular portion 291 and a protrusion 292. The annular portion 291 forms a closed structure around the third connecting portion 27. The protrusion 292 is provided on the outer wall of the annular portion 291. The insulating member 24 is provided with a receiving groove 24b. At least a portion of the supporting member 25 is located within the receiving groove 24b. At least a portion of the third connecting portion 27 is located within the receiving groove 24b. At least one of the annular portion 291 and the protrusion 292 is connected to the bottom wall of the receiving groove 24b. Multiple protrusions 292 are provided. Multiple protrusions 292 are spaced apart along the outer peripheral wall of the annular portion 291, and at least one protrusion 292 is connected to the side wall of the receiving groove 24b.

[0219] The support member 25 has an opening 25c facing the bottom wall of the receiving groove 24b, and the opening 25c communicates with the first exhaust channel 25a to form an exhaust chamber. The support member 25 is formed by bending a single sheet, as shown in Figure 16.

[0220] The support member 25 is connected to the first wall 22a. The first wall 22a is an end cap, and the support member 25 can be bonded to the lower surface of the end cap. The material of the support member 25 can be a material resistant to high temperatures above 300℃. The material of the support member 25 can be polyimide (PI), fusible polytetrafluoroethylene (PFA), or aluminum, stainless steel SUS304, SUS430, 305, 316, etc. The support member 25 can also be welded to the end cap. In this case, the melting point of the material of the support member 25 is close to that of the material of the end cap, with an error within 100℃. The material of the support member 25 can be aluminum, stainless steel SUS304, SUS430, 305, 316, etc.

[0221] Both ends of the insulating member 24 are provided with bosses, each boss has a receiving groove 24b, and each receiving groove 24b has a supporting member 25. Each receiving groove 24b has two supporting members 25, and the two supporting members 25 in the same receiving groove 24b are symmetrically arranged along the first center line L1 of the first wall 22a. The first center line refers to the center line arranged along the length direction of the first wall 22a. The supporting members 25 of different receiving grooves 24b do not need to be symmetrical.

[0222] The electrode terminal 26 can be a pole post 26a, or a combination of a pole post 26a and an adapter plate 26b. A portion of the pole post 26a is located within the first space a and connected to the electrode assembly 23, while the other portion extends through the first wall 22a to the outside of the housing 20'. The adapter plate 26b is located within the first space a, and the pole post 26a is connected to the electrode assembly 23 via the adapter plate 26b. The pole post 26a has a dimension of 10mm-40mm in the second direction Y, which is perpendicular to the first direction X.

[0223] The third connecting part 27 is integrally formed with the insulating component 24.

[0224] The battery cell provided in this application embodiment is suitable for situations where the electrode terminals (such as poles) protrude from the first wall. This is because protruding electrode terminals (such as poles) from the first wall would block the exhaust path from the side cavity to the explosion-proof valve area. Since the electrode terminals are generally placed in the center, the center of the supporting member should be offset relative to the centerline.

[0225] In this embodiment, the insulating component can be made of ordinary polypropylene (PP). The supporting component is a metal bracket with a U-shaped structure, corresponding to the electrode terminals, and can continuously support and allow communication between the side cavity of the battery cell and the area below the explosion-proof valve in the later stages of thermal runaway.

[0226] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, The battery cell comprises: a housing having a first wall, a second wall, a pressure relief mechanism and an electrode terminal, the pressure relief mechanism and the electrode terminal are arranged on the first wall, and the electrode terminal and the pressure relief mechanism are arranged in a first direction, the first wall is arranged in intersection with the second wall; an electrode assembly arranged in the housing, a first space is formed between the electrode assembly and the first wall, the second wall is arranged on one side of the electrode assembly in the first direction, and a second space is formed between the second wall and the electrode assembly; a support member arranged in the housing, at least part of the support member is located in the first space, and a first exhaust passage is arranged on the support member; wherein, in the first direction, at least part of a first projection of the first exhaust passage on the second wall is located outside a second projection of the electrode terminal on the second wall. The electrode terminal comprises a first connecting portion and a second connecting portion, at least part of the first connecting portion is located in the first space and connected with the electrode assembly, at least part of the second connecting portion is located outside the housing, and the second connecting portion is connected with the first connecting portion; 2. The battery cell of claim 1, wherein, The area of the portion of the first projection located outside the second projection is greater than or equal to 5 mm 2 .

3. The battery cell according to claim 1 or 2, wherein in the first direction, at least part of the first projection is located outside the projection of the first connecting portion on the second wall. The electrode terminal further comprises a transition sheet, the transition sheet is located in the first space, and the first connecting portion is connected with the electrode assembly through the transition sheet; 4. The battery cell of claim 3, wherein, in the first direction, the projection of the combination structure of the transition sheet and the first connecting portion on the second wall is the second projection. The battery cell further comprises:

5. The battery cell of any one of claims 1-4, wherein, an insulating member arranged in the housing, at least part of the insulating member is located in the first space, a second exhaust passage is arranged on the insulating member, the second exhaust passage communicates the first space and the second space, a third connecting portion is arranged on the insulating member, and the insulating member is connected with the first wall through the third connecting portion. The third connecting portion is detachably connected with the first wall.

6. The battery cell of claim 5, wherein, One side of the first wall facing the insulating member is provided with a first groove, at least part of the third connecting portion protrudes towards the first wall and forms a plug-in portion, and the plug-in portion is arranged in the first groove.

7. The battery cell according to claim 5 or 6, wherein A second groove is arranged on the side wall of the first groove, the second groove and the first groove form a combined groove, and the combined groove is used for accommodating the third connecting portion after melting.

8. The battery cell of claim 7, wherein the cathode comprises a lithium metal oxide. A plurality of second grooves are arranged, and the plurality of second grooves are arranged in the depth direction of the first groove.

9. The battery cell of claim 8, wherein the cathode comprises a lithium metal oxide. The position of the third connecting portion corresponds to the position of the support member, a through hole is arranged on the support member, and the through hole is used for passing through the third connecting portion.

10. The battery cell of any one of claims 5-9, wherein, The size of the through hole is greater than the size of the third connecting portion.

11. The battery cell of claim 10, wherein the cathode comprises a lithium metal oxide. The through hole is a circular hole, and the third connecting portion is a circular column.

12. The battery cell as described in claim 10, characterized in that, The diameter of the third connecting portion is 1mm-5mm.

13. The battery cell as described in claim 12, characterized in that, The inner diameter D2 of the through hole and the diameter D1 of the third connecting portion satisfy: 0 14. The battery cell as described in claim 12 or 13, characterized in that, A reinforcing portion is arranged on the third connecting portion, and the reinforcing portion is used for reinforcing the mechanical strength of the third connecting portion.

15. The battery cell of any one of claims 5-14, wherein, ​ 16. The battery cell of claim 15, wherein, The reinforcing part comprises a ring-shaped part and a protruding part, the ring-shaped part is formed on the outer wall of the third connecting part to form a closed structure, and the protruding part is arranged on the outer wall of the ring-shaped part and connected with the insulating member.

17. The battery cell as described in claim 16, characterized in that, The insulating member is provided with a receiving groove, and at least part of the supporting member is located in the receiving groove.

18. The battery cell of claim 17, wherein, The reinforcing part is located in the receiving groove and connected with the bottom wall of the receiving groove.

19. The battery cell of claim 18, wherein the cathode comprises a lithium metal oxide. The protruding part is provided with a plurality of protruding parts, the plurality of protruding parts are arranged at intervals along the outer wall of the ring-shaped part, and at least one protruding part is connected with the side wall of the receiving groove.

20. The battery cell of any one of claims 17-19, wherein, The supporting member has an opening arranged towards the bottom wall of the receiving groove, and the opening is connected with the first exhaust passage to form an exhaust cavity.

21. The battery cell as described in claim 20, characterized in that, At least part of the reinforcing part is located in the exhaust cavity.

22. The battery cell of any one of claims 5-21, wherein, The third connecting part is integrally formed with the insulating member.

23. The battery cell of any one of claims 5-22, wherein, The supporting member comprises: a first supporting part connected with the first wall; and a second supporting part arranged on the side of the first supporting part away from the first wall and connected with the first supporting part, the second supporting part and the first supporting part form the first exhaust passage.

24. The battery cell as described in claim 23, characterized in that, The second supporting part comprises: a first sheet arranged opposite to the first supporting part; and a second sheet connected with the first sheet and the first supporting part.

25. The battery cell as described in claim 24, characterized in that, The second supporting part is provided with two second supporting parts arranged at intervals and arranged at two ends of the first supporting part.

26. The battery cell of any one of claims 1-25, wherein, The supporting member is formed by bending one sheet.

27. The battery cell of any one of claims 1-26, wherein, The supporting member is connected with the first wall.

28. The battery cell of any one of claims 1-27, wherein, The supporting member is bonded with the first wall.

29. The battery cell as described in claim 28, characterized in that, The melting point of the supporting member is greater than or equal to 300℃.

30. The battery cell of any one of claims 1-27, wherein, The supporting member is welded with the first wall.

31. The battery cell of claim 30, wherein the cathode comprises a lithium metal oxide. The melting point of the supporting member is within 100℃ of the melting point of the first wall.

32. The battery cell of any one of claims 1-31, wherein, The first space is provided with the supporting member at opposite ends.

33. The battery cell as described in claim 32, characterized in that, The first space is provided with two supporting members at opposite ends respectively, and the two supporting members arranged at the same end are arranged symmetrically along the first center line in the length direction of the first wall.

34. A battery, comprising: The battery cell of any one of claims 1-33.

35. An electrical device, comprising: The battery of claim 34.

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