Battery cell, battery and electric device

Abstract

The utility model is suitable for the technical field of batteries, and provides a battery monomer, a battery and an electric device. The battery monomer comprises a shell, an electrode assembly and a supporting component, the shell is provided with a first wall, a second wall, a pressure relief mechanism and an electrode terminal, and the electrode assembly is arranged in the shell; a first space is formed between the electrode assembly and the first wall, and a second space is formed between the electrode assembly and the second wall; the supporting component is arranged in the shell, at least part of the supporting component is located in the first space, the supporting component is provided with a first exhaust channel, the first exhaust channel is used for communicating the first space with the second space, and at least part of a first projection of the first exhaust channel on the second wall is located outside a second projection of the electrode terminal on the second wall. According to the battery monomer, the battery and the power utilization device provided by the invention, rapid pressure relief can be realized.

Description

Technical Field

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

[0002] Batteries release heat due to electrochemical reactions during charging and discharging. When the rate of heat release exceeds the rate of heat dissipation, thermal runaway occurs. This can cause battery bulging and even explosion. In related technologies, batteries in the late stages of thermal runaway are prone to problems such as bursting side welds, erupting high-temperature metal particles into adjacent battery cells, and causing heat spread due to untimely venting. Utility Model Content

[0003] In view of the above problems, the present application provides a battery cell, a battery and an electrical device, aiming to improve the technical problem of untimely exhaust in the late stage of thermal runaway.

[0004] In a first aspect, an embodiment of the present application provides a battery cell, comprising: a housing having a first wall, a second wall, a pressure relief mechanism, and an electrode terminal, wherein the pressure relief mechanism and the electrode terminal are both disposed on the first wall, and the electrode terminal and the pressure relief mechanism are spaced apart and arranged 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,

[0005] The second wall is arranged on at least one side of the electrode assembly along the first direction, and forms a second space between the second wall and the electrode assembly; and the support member is arranged in the outer shell, and at least a portion of the support member is located in the first space, and is located between the second space and the pressure relief mechanism, 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 terminal on the second wall.

[0006] In the battery cell provided in the embodiment of the present application, a support member is provided between the electrode assembly and the first wall. At the same time, 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 terminal on the second wall. In this way, when the battery cell is exhausted by means of the first exhaust channel on the support member in the late stage of thermal runaway, at least a portion of the gas can reach the location of the pressure relief mechanism without being blocked by the electrode terminal, thereby achieving rapid pressure relief. This can reduce the risk of cracking on the side of the battery cell to a certain extent and improve the safety of the battery cell. In some embodiments, the area of ​​the portion of the first projection located outside the second projection is greater than or equal to 5mm 2 This allows more gas to reach the pressure relief mechanism through the first exhaust channel, allowing the battery cell to quickly release pressure in the event of thermal runaway, which can reduce the risk of cracking on the side of the battery cell to a certain extent.

[0007] In some embodiments, the electrode terminal includes a first connecting portion and a second connecting portion, at least a portion of the first connecting portion is located within the first space and is connected to the electrode assembly, at least a portion of the second connecting portion is located outside the outer shell, and the second connecting portion is connected to the first connecting portion; along the first direction, at least a portion of the first projection is located outside the projection of the first connecting portion on the second wall.

[0008] With the solution provided in this embodiment, the electrode terminal has a simple structure and a small size in a direction perpendicular to the first direction, so that the distance between two supporting members in the same group can be small, making the structure of the battery cell compact.

[0009] In some embodiments, the electrode terminal further includes a transfer plate, which is located in the first space, and the first connecting portion is connected to the electrode assembly through the transfer plate; along the first direction, the projection of the combined structure of the transfer plate and the first connecting portion on the second wall is a second projection.

[0010] By adopting the solution provided in this embodiment, the distance between two supporting members in the same group is larger, which facilitates installation.

[0011] In some embodiments, the battery cell further comprises: an insulating member disposed within the housing, with at least a portion of the insulating member located within the first space, the insulating member being provided with a second exhaust channel; the second exhaust channel connecting the first space and the second space; and a third connecting portion disposed on the insulating member, the insulating member being connected to the first wall via the third connecting portion. The provision of the third connecting portion can secure the relative position of the insulating member and the first wall. This, on the one hand, facilitates the integral installation of the insulating member and the first wall on other portions of the housing after assembly, thereby improving the assembly efficiency of the battery cell; and, on the other hand, can prevent the insulating member from moving relative to the first wall during use of the battery cell. This prevents the relative position of the second exhaust channel, the pressure relief mechanism, the first space, and the second space from changing. This allows 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, thereby stabilizing the performance of the battery cell.

[0012] In some embodiments, the third connection portion is detachably connected to the first wall, which facilitates replacement or maintenance of the insulating component.

[0013] In some embodiments, a first groove is defined on a surface of the first wall facing the insulating member, and at least a portion of the third connecting portion protrudes toward the first wall to form a plug-in portion, which is inserted into the first groove. The provision of the plug-in portion and the first groove allows the third connecting portion to be plugged into and positioned with the first wall, facilitating connection and disconnection operations between the third connecting portion and the first wall.

[0014] 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 portion after heat smelting. The provision of the second groove allows the third connecting portion to enter the combined groove formed by the first and second grooves as much as possible after heat smelting, thereby achieving a tight connection with the first wall.

[0015] In some embodiments, a plurality of second grooves are provided, and the plurality of second grooves are spaced apart along the depth direction of the first groove. This can increase the amount of the third connecting portion that enters the combined groove after heat staking, increase the contact area between the third connecting portion and the combined groove after heat staking, and stabilize the connection between the third connecting portion and the first wall after heat staking.

[0016] In some embodiments, the position of the third connection portion corresponds to the position of the support member, and the support member is provided with a through-hole for the third connection portion to pass through. Due to the limited width of the first wall, the solution provided by this embodiment allows the third connection portion and the support member to be located at the same or approximately the same position on the first wall, making the structure within the battery cell compact and not affecting the arrangement and installation of other structures. Furthermore, if the third connection portion is an insulator, in the event of thermal runaway of the battery cell, the third connection portion can be hot-melted and adhered between the support member and the first wall, thereby strengthening the connection between the support member and the first wall and reducing the risk of separation of the support member and the first wall in the event of thermal runaway of the battery cell.

[0017] In some embodiments, the size of the through hole is larger than that of the third connecting portion, so as to facilitate the third connecting portion to pass through the through hole, thereby improving the assembly efficiency of the battery cell.

[0018] In some embodiments, the through-hole is a circular hole, and the third connecting portion is a cylindrical structure. Compared to a prismatic structure, a cylindrical third connecting portion allows the third connecting portion to pass through the through-hole without having to pay attention to the insertion angle, facilitating assembly. The circular through-hole matches the shape of the third connecting portion, facilitating its passage.

[0019] In some embodiments, the diameter of the third connection portion is 1 mm to 5 mm. The third connection portion adopts the size provided in this embodiment, which can provide the third connection portion with a certain supporting strength without affecting the installation of other components due to its large size, and can also ensure a certain positioning effect, achieving multiple goals at one stroke.

[0020] In some embodiments, the inner diameter D2 of the through hole and the diameter D1 of the third connecting portion satisfy the following relationship: 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 portion without increasing the size of the through hole and affecting the support strength of the support member.

[0021] In some embodiments, a reinforcement portion is provided on the third connection portion to enhance the mechanical strength of the third connection portion. Since the third connection portion needs to have a certain mechanical strength, the solution provided in this embodiment can improve the mechanical strength of the third connection portion to a certain extent.

[0022] In some embodiments, the reinforcing portion includes an annular portion and a convex portion. The annular portion surrounds the outer peripheral wall of the third connecting portion to form a closed structure, and the convex portion is provided on the outer wall of the annular portion and connected to the insulating member. The annular portion is connected to the outer peripheral wall of the third connecting portion, which can increase the thickness of at least a portion of the third connecting portion, thereby increasing the mechanical strength of the portion of the third connecting portion where the annular portion is provided. The convex portion can further increase the thickness of the annular portion and the third connecting portion, thereby increasing the mechanical strength of the portion of the third connecting portion. At the same time, the convex portion and the insulating member can cooperate with the annular portion to provide stable support for the third connecting portion.

[0023] In some embodiments, the insulating member is provided with a receiving groove, and at least a portion of the support member is located in the receiving groove. Using the solution provided by this embodiment, the volume of the assembly of the insulating member and the support member can be reduced, facilitating the miniaturization design of the battery cell.

[0024] In some embodiments, the reinforcement portion is located within the receiving groove and connected to the bottom wall of the receiving groove. This arrangement can prevent the thickness of the insulating member from increasing, making the structure within the battery cell compact and not occupying the original design space of the electrode assembly. Furthermore, the relative position of the reinforcement portion and the receiving groove is stable, thereby enhancing the mechanical strength of the third connecting portion while providing better support for the third connecting portion.

[0025] In some embodiments, multiple protrusions are provided, spaced apart along the outer circumferential wall of the annular portion, and at least one protrusion is connected to the side wall of the receiving groove. Multiple protrusions are provided and spaced apart along the outer circumferential wall of the annular portion, so that the protrusions can provide support for the annular portion at multiple angles, thereby enabling the reinforcement portion to provide support for the third connecting portion at multiple angles. Furthermore, at least one protrusion is connected to the side wall of the receiving groove, which can further improve the connection stability between the reinforcement portion, the receiving groove, and the insulating member, while also strengthening the reinforcement portion's support for the third connecting portion.

[0026] In some embodiments, the support member has an opening disposed toward the bottom wall of the receiving groove, the opening being connected to the first exhaust channel to form an exhaust cavity. The solution provided in this embodiment facilitates welding operations between the support member and the first wall.

[0027] In some embodiments, at least a portion of the reinforcement portion is located within the exhaust cavity. This allows the reinforcement portion to be positioned with minimal restriction on the space between the support member and the bottom wall of the receiving groove, thereby ensuring that the reinforcement effect of the reinforcement portion meets usage requirements.

[0028] In some embodiments, the third connecting portion is integrally formed with the insulating member. This solution can ensure a stable connection between the third connecting portion and the insulating member and facilitate processing.

[0029] In some embodiments, the support member includes: a first support portion connected to the first wall; and a second support portion disposed on a side of the first support portion facing away from the first wall and connected to the first support portion, the second support portion and the first support portion forming a first exhaust passage. The support member adopts the structure provided in this embodiment, which is simple and easy to manufacture.

[0030] In some embodiments, the second support portion includes: a first sheet disposed opposite 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 process.

[0031] In some embodiments, two second support portions are provided, and the two second support portions are spaced apart and disposed at both ends of the first support portion. With the structure provided in this embodiment, the above-mentioned opening can be formed between the two second support portions to facilitate welding of the support member to the first wall.

[0032] In some embodiments, the support member is formed by bending a single sheet. This stabilizes the connection structure of the various components of the support member. In some embodiments, the support member is connected to the first wall. This ensures that after the insulating member is thermally melted, the position of the support member remains unchanged, allowing it to remain supported between the first wall and the main body of the electrode assembly, thereby ensuring exhaust efficiency in the first exhaust channel.

[0033] In some embodiments, the support member is bonded to the first wall. Bonding the support member and the first wall can form a continuous interfacial connection between the two, thereby reducing stress concentration, ensuring the strength of the support member and the first wall, and improving the fatigue life of the support member and the first wall. Furthermore, the assembly cost of the two is relatively low.

[0034] In some embodiments, the melting point of the support member is greater than or equal to 300° C. The melting point of the support member is greater than or equal to 300° C., which can meet the use requirements in the case of thermal runaway of the battery cell.

[0035] In some embodiments, the support member is welded to the first wall. Welding the support member to the first wall can ensure a stable connection between the two, facilitate operation, and facilitate mechanization and automation.

[0036] In some embodiments, the melting point of the support member and the melting point of the first wall are within 100° C. This facilitates welding of the two.

[0037] In some embodiments, support members are provided at opposite ends of the first space. Compared to providing a support member only at one location in the first space, the solution provided by this embodiment allows gas on the main body side of the electrode assembly to quickly reach the pressure relief mechanism through the first exhaust channel on the support member in the event of thermal runaway, thereby improving the safety of the battery cells and ensuring, to a certain extent, good exhaust support on both sides of the electrode assembly.

[0038] In some embodiments, two support members are provided at opposite ends of the first space, and the two support members provided at the same end are symmetrically arranged along the first centerline in the longitudinal direction of the first wall. The solution provided in this embodiment facilitates positioning and assembly of the support members.

[0039] In a second aspect, an embodiment of the present application provides a battery, comprising a battery cell provided by any of the above embodiments.

[0040] The battery provided in the embodiments of the present application, including the battery cell provided in any of the above embodiments, can continuously maintain the connection between the side cavity of the battery cell and the pressure relief mechanism at various stages of thermal failure to achieve rapid pressure relief, thereby reducing the risk of cracking on the side of the battery cell to a certain extent and improving the safety of the battery cell use.

[0041] In a third aspect, an embodiment of the present application provides an electrical device comprising a battery provided in any of the above embodiments.

[0042] The electrical device provided in the embodiments of the present application, including the battery provided in any of the above embodiments, can continuously maintain the connection between the side cavity of the battery cell and the pressure relief mechanism at various stages of thermal failure, thereby achieving rapid pressure relief, thereby reducing the risk of cracking on the side of the battery cell and improving the safety of the battery cell, battery and electrical device.

[0043] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0045] Figure 1 A schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0046] Figure 2 A schematic diagram of the exploded structure of a battery provided in some embodiments of the present application;

[0047] Figure 3 A schematic diagram of the exploded structure of a battery cell provided in some embodiments of the present application;

[0048] Figure 4 A schematic diagram of a partial cross-sectional structure of a battery cell provided in some embodiments of the present application;

[0049] Figure 5 A schematic structural diagram of an insulating component in a battery cell provided in some embodiments of the present application;

[0050] Figure 6 A side view of an assembly structure of a first wall and a support member in a battery cell provided in some embodiments of the present application;

[0051] Figure 7 The battery cells provided in some embodiments of the present application are Figure 6 Schematic diagram of the cross-sectional structure in the AA direction;

[0052] Figure 8 A schematic diagram of the positions of the first projection and the second projection corresponding to the battery cells provided in some embodiments of the present application;

[0053] Figure 9 A schematic diagram of the main structure of the end cover of a battery cell provided in some embodiments of the present application;

[0054] Figure 10 For the Figure 9 Schematic diagram of the cross-sectional structure in the CC direction;

[0055] Figure 11 for Figure 10 A partial enlarged schematic diagram of point D in the middle;

[0056] Figure 12 A side view of an assembly structure of a first wall, a support member, and an insulating member in a battery cell provided in some embodiments of the present application;

[0057] Figure 13 The battery cells provided in some embodiments of the present application are Figure 12 Schematic diagram of the cross-sectional structure in the middle BB direction;

[0058] Figure 14 for Figure 13 Schematic diagram of the local enlarged structure at A in the middle;

[0059] Figure 15 A schematic diagram of a partial structure of an insulating component in a battery cell provided in some embodiments of the present application;

[0060] Figure 16 A schematic structural diagram of a support structure in a battery cell provided in some embodiments of the present application.

[0061] The accompanying drawings in the specific implementation manner are as follows:

[0062] 1000. Vehicle;

[0063] 100, battery; 200, controller; 300, motor;

[0064] 10. Box body; 11. First part; 12. Second part;

[0065] 20. Battery cell; 20', housing; 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.

[0066] Second exhaust channel; 24b, accommodating groove; 25, supporting member; 25a, first exhaust channel; 25b, through hole; 25c, opening; 251, first supporting portion; 252, second supporting portion; 2521, first sheet; 2522, second sheet; 26, electrode terminal; 26a, pole; 26b, adapter; 261, first connecting portion; 262, second connecting portion; 27, third connecting portion; 271, plug-in portion; 28a, first groove; 28b, second groove; 29, reinforcement portion; 291, annular portion; 292, protrusion;

[0067] a, first space; b, second space; c, first projection; d, second projection; D1, diameter of the third connecting portion; D2, inner diameter of the through hole; X, first direction; Y, second direction; L1, first center line. DETAILED DESCRIPTION

[0068] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0069] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0070] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0071] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0072] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0073] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0074] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0075] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0076] Batteries release heat during the charge and discharge process due to electrochemical reactions. When the rate of heat release is greater than the rate of heat dissipation, thermal runaway can occur. This can cause the battery to bulge or even explode.

[0077] In order to reduce the risk of explosion in the event of thermal runaway of the battery, an explosion-proof valve is generally provided on the battery. In addition, an insulating component is generally provided between the electrode assembly of the battery and the explosion-proof valve. The insulating component is provided with an exhaust channel so that the gas on the electrode assembly side can quickly pass through the exhaust channel to the location of the explosion-proof valve in the event of thermal runaway, and exhaust is achieved through the explosion-proof valve so that the pressure can be released in time during the thermal runaway process of the battery.

[0078] However, the current insulating components have a low melting point and are easily melted in a thermal runaway state. At the same time, the electrode assembly is easily moved toward the side where the explosion-proof valve is located under the impact of the high-pressure airflow in the battery casing, thereby abutting against 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, hindering the rapid flow of gas in the side cavity to the bottom of the explosion-proof valve for exhaust, causing the side weld of the battery cell to burst, and high-temperature metal particles to spray to adjacent battery cells, causing heat spread.

[0079] To improve the above-mentioned problems, related technologies attempt to add support members with a higher melting point than the insulating member to the battery cells, and set exhaust channels in the support members so that after the insulating member is melted in the late stage of thermal runaway, the battery can be vented with the help of the exhaust channels on the support members. However, the setting of the support members in related technologies does not take into account the positional relationship between the support members and the electrode terminals (such as poles, adapters, etc.) in the battery. As a result, the gas discharged to the explosion-proof valve through the exhaust channels on the support members is usually blocked by the electrode terminals, resulting in untimely exhaust. As a result, the battery is still prone to side weld explosions, high-temperature metal particles are ejected to adjacent battery cells, causing heat spread and other problems.

[0080] To address the aforementioned issues, embodiments of the present application provide a battery cell. This battery cell comprises an insulating member and a support member disposed between the electrode assembly and the first wall. Furthermore, along a first direction, at least a portion of a first projection of a first exhaust channel on the second wall is positioned outside a second projection of an electrode terminal on the second wall. This allows the battery cell to vent gas via the first exhaust channel on the support member in the late stage of thermal runaway, allowing at least some gas to reach the pressure relief mechanism without being blocked by the electrode terminal, achieving rapid pressure relief. This, in turn, reduces the risk of cracking on the sides of the battery cell and improves the safety of the battery cell.

[0081] The battery cells disclosed in the embodiments of the present application can be used in electrical devices that use batteries as power sources or various energy storage systems that use batteries as energy storage elements. Electrical devices can include, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, battery-powered vehicles, electric vehicles, ships, spacecraft, and the like. Electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, among others.

[0082] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0083] Please refer to Figure 1 , Figure 1 A schematic structural diagram of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000. The battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000. For example, the battery 100 may serve as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, to meet the power requirements for starting, navigating and driving the vehicle 1000.

[0084] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0085] Please refer to Figure 2 , Figure 2This is a schematic diagram of the exploded structure of a battery 100 provided in some embodiments of the present 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 is used to provide a storage space for the battery cell 20 and can have various structures. In some embodiments, the housing 10 can include a first portion 11 and a second portion 12, which overlap each other and together define a storage space for the battery cell 20. The second portion 12 can be a hollow structure with one end open. The first portion 11 can be a plate-like structure, with the first portion 11 overlapping the open side of the second portion 12, so that the first portion 11 and the second portion 12 together define a storage space. The first portion 11 and the second portion 12 can also be hollow structures with one end open, with the open side of the first portion 11 overlapping 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 have various shapes, such as a cylinder, a rectangular parallelepiped, etc. In some cases, the battery cells can also be directly installed in the vehicle without a box or shell, that is, there is no need to form a battery pack, and the structure of the vehicle body itself serves as the fixing structure of the battery cells.

[0086] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell 20 may be housed within the housing 10. Alternatively, the battery 100 may be constructed by first connecting multiple battery cells 20 in series, in parallel, or in a hybrid connection to form a battery module, which is then connected in series, in parallel, or in a hybrid connection to form a complete battery module, and then housed within the housing 10. The battery 100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 20.

[0087] Each battery cell 20 may be a secondary battery or a primary battery, and may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0088] Please refer to Figure 3 , Figure 3Schematic diagram of the decomposed structure of the battery cell 20 provided for some embodiments of the present application. The battery cell 20 refers to the smallest unit that makes up the battery. The battery cell 20 includes an outer shell 20', an electrode assembly 23 and other functional components. Among them, the outer shell 20' is a closed structure that can form the internal environment of the battery cell 20, generally including an end cover 21 and a shell 22. The shell 22 and the end cover 21 can be two independent components. An opening can be provided on the shell 22, and the outer shell 20' is formed by covering the opening with the end cover 21 at the opening. Without limitation, the outer shell 20' can also be an integrated structure, that is, the end cover 21 and the shell 22 are integrated. Specifically, the end cover 21 and the shell 22 can form a common connection surface before other components are put into the shell. When the interior of the shell 22 needs to be encapsulated, the end cover 21 is covered with the shell 22.

[0089] The end cap 21 is a component that covers the opening of the housing 22 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the end cap 21 can be adapted to the shape of the housing 22 to fit the housing 22. Optionally, the end cap 21 can be made of a material with a certain degree of hardness and strength, such as an aluminum alloy. This prevents the end cap 21 from deforming under compression or collision, thereby enhancing the structural strength and safety of the battery cell 20. Functional components such as electrode terminals 26 can be provided on the end cap 21. The electrode terminals 26 can be used to electrically connect to the electrode assembly 23 to transmit or receive electrical energy from the battery cell 20. In some embodiments, the end cap 21 can also be provided with a pressure relief mechanism to release internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The end cap 21 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic, and this is not particularly limited in the present embodiments.

[0090] The shell 22 is a component used to cooperate with the end cap 21 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 23, electrolyte and other components. The shell 22 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 22 can be determined according to the specific shape and size of the electrode assembly 23. The material of the shell 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this.

[0091] The electrode assembly 23 is a component in the battery cell 100 where electrochemical reactions occur. One or more electrode assemblies 23 may be contained in the housing 22. The electrode assembly 23 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly, and the parts of the positive and negative electrode sheets without active materials each constitute a tab 23a. The positive and negative electrode tabs may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the tab 23a is connected to the electrode terminal 26 to form a current loop.

[0092] like Figures 3 to 7 As shown, Figure 4 A schematic diagram of a partial cross-sectional structure of a battery cell provided in some embodiments of the present application; Figure 5 A schematic structural diagram of an insulating component in a battery cell provided in some embodiments of the present application; Figure 6 A schematic side view of the first wall and support member in a battery cell provided in some embodiments of the present application; Figure 7 The battery cells provided in some embodiments of the present application are Figure 6 Schematic diagram of the cross-sectional structure in the AA direction.

[0093] An embodiment of the present 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 an electrode terminal 26. The pressure relief mechanism 22b and the electrode terminal 26 are both arranged on the first wall 22a. The electrode terminal 26 and the pressure relief mechanism 22b are spaced apart along the first direction X. The first wall 22a and the second wall 22c are arranged to intersect. The electrode assembly 23 is arranged in the housing 20'. A first space a is formed between the electrode assembly 23 and the first wall 22a. The second wall 22c is arranged on at least 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.

[0094] Support member 25 is disposed within housing 20', with at least a portion of support member 25 located within first space a and between second space b and pressure relief mechanism 22b. Support member 25 is provided with a first exhaust passage 25a. First exhaust passage 25a is used to connect first space a and second space b during the middle and late stages of thermal runaway.

[0095] In this case, along the first direction X, at least a portion of a first projection c of the first exhaust channel 25 a on the second wall 22 c is located outside a second projection d of the electrode terminal 26 on the second wall 22 c .

[0096] As mentioned above, the outer shell 20' is a closed structure used to form the internal environment of the battery cell 20, and generally includes an end cover 21 and a shell 22. The shell 22 and the end cover 21 can be two independent components or an integrated structure, which will not be repeated here. Among them, the shell 22 generally has multiple side walls and a bottom wall, and the end cover 21 is generally a single plate or a composite plate with a certain thickness. The first wall 22a can be a side wall in the shell 22 or the bottom wall of the shell 22, or it can be the end cover 21, and the specific setting can be based on the needs of use. The second wall 22c is one or more side walls connected to the first wall 22a. The second wall 22c is at least provided on one side of the electrode assembly 23 along the first direction X, which means that when the second wall 22c is provided with a side wall, it is provided on one side of the electrode assembly 23 along the first direction X. When the second wall 22c has two side walls, one of them can be provided on one side of the electrode assembly 23 along the first direction X, and the other can be provided on the other side of the electrode assembly 23 along the first direction X.

[0097] The pressure relief mechanism 22b can be an explosion-proof valve, or other mechanisms that can achieve pressure relief. For example, a notch is set on the shell 20'. When the air pressure in the shell 20' is high, the gas can break through the notch to achieve pressure relief. At this time, the notch and the area surrounded by the notch are the pressure relief mechanism 22b.

[0098] 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 of the electrode assembly 23 in the height direction, and a side wall connecting the two end walls. Generally, of the two end walls, one end wall is in contact with the outer shell 20', and the other end wall is spaced apart from the outer shell 20'. The first space a refers to the end wall or the space formed between the side wall and the first wall 22a in each wall of the electrode assembly 23 that is opposite to and spaced apart from the first wall 22a. The second space b refers to the space formed between all the end walls and / or side walls in each wall 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, Figure 3 Taking the structure shown as an example, the end cover 21 is the first wall 22a, one end wall of the electrode assembly 23 is the bottom wall of the electrode assembly 23, which contacts the bottom wall in the shell 22, and the other end wall of the electrode assembly 23 is the top wall of the electrode assembly 23, which is spaced apart from the end cover 21. At this time, the first space a is the space between the top wall of the electrode assembly 23 and the end cover 21, and the second space b is the space between the side wall of the electrode assembly 23 and the side wall of the shell 22.

[0099] The support member 25 is a member for supporting between the main body 23b and the first wall 22a of the electrode assembly 23 after at least a portion of the insulating member 24 is heat-melted, so that the gas on the side of the main body 23b of the electrode assembly 23 (i.e., the gas in the second space b) can flow to the position of the pressure relief mechanism 22b through the first exhaust channel 25a on the support member 25. Exemplarily, the support member 25 can be made of a material such as metal or ceramic having a melting point higher than that of the insulating member 24. 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 physical state from solid (melts) to liquid. The melting point of the support member 25 is the temperature at which the physical state of the support member 25 changes (melts) from solid to liquid, and the melting point of the insulating member 24 is the temperature at which the physical state of the insulating member 24 changes (melts) from solid to liquid.

[0100] The first exhaust passage 25a may be a hole, microporous structure, or opening formed on the support member 25, depending on the intended use. The first exhaust passage 25a is used to connect the first space a and the second space b. In the initial state, i.e., before the insulating member 24 is heat-fused, the first exhaust passage 25a may be blocked or left exposed, as long as it can connect the first space a and the second space b after the insulating member 24 is heat-fused.

[0101] The 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 can include a pole 26a, a transition piece 26b, etc., and the specific details can be determined according to the needs of use. A portion of the electrode terminal 26 is located in the first space a and is connected to the electrode assembly 23, and the other portion extends through the first wall 22a to the outside of the shell 20'. The first direction X can be the length direction, height direction or other direction of the first wall 22a, and 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 the end cover 21, the first direction X is generally the length direction of the first wall 22a; when the first wall 22a is the small surface of the shell 22 (that is, the side with the smaller area in the side wall of the shell 22), the first direction X can be the height direction of the first wall 22a.

[0102] The first projection c of the first exhaust channel 25a on the second wall 22c refers to the projection of the first exhaust channel 25a on the second wall 22c along the first direction X. The second projection d of the electrode terminal 26 on the second wall 22c refers to the projection of the electrode terminal 26 on the second wall 22c along the first direction X.

[0103] It can be understood that since the first exhaust channel 25a is a virtual structure such as a through hole 25b or a channel, the first projection c is formed by the inner wall of the support member 25, that is, the projection of the inner wall of the support member 25 that forms the first exhaust channel 25a on 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 on the second wall 22c is located outside the second projection d of the electrode terminal 26 on the second wall 22c, which means 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 on the second wall 22c. Figure 7 The area of ​​the left half of the first exhaust passage 25 a enclosed by the dotted frame L2 is located outside the outer contour line L3 of the electrode terminal 26 .

[0104] The first projection c and the second projection d are set as follows Figure 8 It can be understood that since the first exhaust channel 25a is a virtual structure such as a through hole 25b or a channel, the area corresponding to the first projection c is a transparent structure. Figure 8 The pattern filled in the first projection c is an auxiliary line set to facilitate observation of the range of the first projection c. It does not mean that there is a pattern or fill in the projection at this location.

[0105] The exhaust method of the battery cell 20 provided in the embodiment of the present application in the thermal runaway state is as follows:

[0106] The battery cell 20 generally further includes an insulating member 24 , through which the battery cell 20 vents before thermal runaway. In the initial state, the first venting channel 25 a on the support member 25 may be exposed outside the insulating member 24 or may be blocked by the insulating member 24 .

[0107] In the early stage of thermal runaway, the insulating component 24 has not melted, and the exhaust channel on the insulating component 24 (referred to as the second exhaust channel 24a) still exists. At this time, the gas on the side of the main body 23b of the electrode assembly 23 (i.e., the gas in the second space b) can pass through the second exhaust channel 24a into the first space a and reach the position of the pressure relief mechanism 22b, and exhaust is achieved through the pressure relief mechanism 22b.

[0108] During the middle and late stages of thermal runaway, when the temperature within the housing 20' is greater than the melting point of the insulating member 24 but less than the melting point of the support member 25, the insulating member 24 melts, causing the second exhaust channel 24a to disappear. Simultaneously, the first exhaust channel 25a is exposed, and the support member 25 is supported between the electrode assembly 23 and the first wall 22a, preventing the electrode assembly 23 from fully contacting the first wall 22a. Gas on the side of the main body 23b of the electrode assembly 23 (i.e., gas within the second space b) can then pass through the first exhaust channel 25a into the first space a and reach the location of the pressure relief mechanism 22b, where it can be exhausted through the pressure relief mechanism 22b. Furthermore, during this period, because at least a portion of the first projection c of the first exhaust channel 25a onto the second wall 22c along the first direction X is located outside the second projection d of the electrode terminal 26 onto the second wall 22c along the first direction X, gas flowing through the first exhaust channel 25a toward the pressure relief mechanism 22b is not completely blocked by the electrode terminal 26, allowing at least a portion of the gas to reach the pressure relief mechanism 22b without being blocked.

[0109] The battery cell 20 provided in the embodiment of the present application has a support member 25 arranged between the electrode assembly 23 and the first wall 22a. At the same time, along the first direction X, at least part of the first projection of the first exhaust channel 25a on the second wall 22c is located outside the second projection of the electrode terminal 26 on the second wall 22c. In this way, when the battery cell 20 is exhausted with the help of the first exhaust channel 25a on the support member 25 in the late stage of thermal runaway, at least part of the gas will not be blocked by the electrode terminal 26 and can reach the position of the pressure relief mechanism 22b, thereby realizing rapid pressure relief, thereby reducing the risk of cracking on the side of the battery cell 20 to a certain extent and improving the safety of the use of the battery cell 20.

[0110] In some embodiments, the area of ​​the portion of the first projection outside the second projection is greater than or equal to 5 mm. 2 .

[0111] In this way, more gas can reach the pressure relief mechanism 22b through the first exhaust channel 25a, so that the battery cell 20 can quickly relieve pressure 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.

[0112] like Figures 9 to 11 As shown, in some embodiments, the electrode terminal 26 includes a first connection portion 261 and a second connection portion 262. At least a portion of the first connection portion 261 is located within the first space and is connected to the electrode assembly 23. At least a portion of the second connection portion 262 is located outside the housing 20' and is connected to the first connection portion 261.

[0113] Along the first direction, at least a portion of the first projection c is located outside the projection of the first connecting portion 261 on the second wall 22 c.

[0114] The first connecting portion 261 and the second connecting portion 262 are respectively a part of the pole 26a. The first connecting portion 261 and the second connecting portion 262 can be connected by screws, bolts, etc., or directly connected by plugging, welding, etc., depending on the use requirements.

[0115] In this embodiment, the electrode terminal 26 may include only the pole 26 a, or may include other components in addition to the pole 26 a, depending on the specific use requirements.

[0116] With the solution provided in this embodiment, the electrode terminal 26 has a simple structure and a small size in a direction perpendicular to the first direction X, so that the distance between two support members 25 in the same group can be small, making the structure of the battery cell 20 compact.

[0117] In some embodiments, the electrode terminal 26 further includes a transition piece 26 b . The transition piece 26 b is located in the first space, and the first connection portion 261 is connected to the electrode assembly 23 via the transition piece 26 b .

[0118] Along the first direction X, a projection of the combined structure of the adapter plate 26 b and the first connecting portion 261 on the second wall 22 c is a second projection.

[0119] By adopting the solution provided in this embodiment, the distance between two supporting members 25 in the same group is larger, which facilitates installation.

[0120] In some embodiments, the pole 26 a has a dimension of 10 mm to 40 mm in the second direction Y. The second direction Y is a direction perpendicular to the first direction X.

[0121] The pole 26 a adopts the size provided in this embodiment, which can make the pole 26 a have greater supporting strength, while not causing adverse effects on other structures in the battery cell 20 due to its excessive size.

[0122] like Figure 12 and Figure 13 As shown, Figure 12 A schematic side view of the structure of a first wall, a support member, and an insulating member in a battery cell provided in some embodiments of the present application; Figure 13 The battery cells provided in some embodiments of the present application are Figure 12Schematic diagram of a cross-sectional structure taken along the BB direction. In some embodiments, the battery cell 20 further includes an insulating member. The insulating member 24 is disposed within the housing 20', with at least a portion of the insulating member 24 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 via the third connecting portion 27.

[0123] The insulating member 24 is used to isolate the main body 23b of the electrode assembly 23 from the first wall 22a to reduce the risk of battery short circuits. For example, the insulating member 24 may be made of plastic, rubber, or the like. "At least a portion of the insulating member 24 is located within the first space a" means that the insulating member 24 may be completely located within the first space a, or partially located within the first space a and partially located outside the first space a.

[0124] The second exhaust passage 24a can be a hole, microporous structure, or opening formed on the insulating member 24, and can be determined based on specific needs. Through the second exhaust passage 24a, gas located on the side of the main body 23b of the electrode assembly 23 (i.e., within 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 comprises the portion of the electrode assembly 23 with the active material layer on the positive electrode sheet and the portion of the electrode assembly 23 with the active material layer on the negative electrode sheet, and is also the portion of the electrode assembly 23 excluding the tabs 23a.

[0125] The third connecting portion 27 is provided on the insulating member 24 and is used to connect to the first wall 22a. It can be integrally formed with the insulating member 24 or provided separately from the insulating member 24, depending on the specific needs. The third connecting portion 27 can be fixedly connected to the first wall 22a or detachably connected to the first wall 22a, depending on the specific needs.

[0126] The provision of the third connection portion 27 can achieve the fixation of 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 combined and installed as a whole on other parts of the shell 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 than the first wall 22a when the battery cell 20 is in use, so that the relative position of the second exhaust channel 24a and the pressure relief mechanism 22b, the first space a, and the second space b is less likely to change, so that the gas passing through the second exhaust channel 24a can smoothly flow from the second space b to the first space a and the location of the pressure relief mechanism 22b, so that the performance of the battery cell 20 is stable.

[0127] In some embodiments, the third connecting portion 27 is detachably connected to the first wall 22a.

[0128] The detachable connection means that the third connecting portion 27 and the first wall 22a can be separated after installation without damaging the structure of the third connecting portion 27 and the first wall 22a. The detachable connection includes but is not limited to plug-in connection, snap-on connection, threaded connection, etc.

[0129] The third connecting portion 27 is detachably connected to the first wall 22 a , which facilitates replacement or maintenance of the insulating member 24 .

[0130] like Figure 13 and Figure 14 As shown, Figure 14 for Figure 13 A partial enlarged structural diagram at point A in the middle. In some embodiments, a first groove 28a is defined on a surface of the first wall 22a facing the insulating member 24. At least a portion of the third connecting portion 27 protrudes toward the first wall 22a and forms an inserting portion 271. The inserting portion 271 is inserted into the first groove 28a.

[0131] The first groove 28a can be integrally formed on the first wall 22a or 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. Alternatively, the first groove 28a can be formed by removing (e.g., by cutting, etc.) a portion of the first wall 22a after the first wall 22a is formed. When the first groove 28a is separately formed from the first wall 22a, the first groove 28a can be prepared separately and then connected by bonding, welding, or other processes.

[0132] The surface of the insulating member 24 facing the first wall 22a can be flat, curved, or irregular. For ease of description, the surface of the insulating member 24 facing the first wall 22a is referred to as the first surface. The aforementioned protrusion of at least a portion of the third connecting portion 27 toward the first wall 22a means that, when the first surface is flat, at least a portion of the third connecting portion 27 protrudes from the plane; when the first surface is curved, at least a portion of the third connecting portion 27 protrudes from the point on the curved surface closest to the first wall 22a.

[0133] It is understood that the third connecting portion 27 may or may not have a certain degree of elasticity. When the third connecting portion 27 is elastic, the plug-in portion 271 is also elastic. In this case, the size of the plug-in portion 271 can be the same as or slightly larger than the size of the first groove 28a. When the third connecting portion 27 is not elastic, the plug-in portion 271 is also not elastic. In this case, in order for the plug-in portion 271 to be smoothly inserted into the first groove 28a, the size of the plug-in portion 271 is generally smaller than the size of the first groove 28a.

[0134] The provision of the plug-in portion 271 and the first groove 28a enables the third connecting portion 27 to be plugged in and positioned and assembled with the first wall 22a, thereby facilitating the connection and separation operations between the third connecting portion 27 and the first wall 22a.

[0135] 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 for accommodating the third connecting portion 27 after hot melting.

[0136] The second groove 28b can be formed on the sidewall 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 specific needs. The second groove 28b is connected to 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.

[0137] The second groove 28b allows the third connection portion 27 to enter the combined groove formed by the first groove 28a and the second groove 28b as much as possible after being hot-melted, thereby achieving a tight connection with the first wall 22a.

[0138] In some embodiments, a plurality of second grooves 28b are provided, and the plurality of second grooves 28b are spaced apart along the depth direction of the first groove 28a.

[0139] The depth direction refers to a vertical direction from the top to the bottom of the first groove 28a.

[0140] The shapes and sizes of the plurality of second grooves 28b may be the same or different, depending on the specific needs. Figure 14 As shown, the two second grooves 28b have different shapes and sizes. 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 portion 27 that enters the combined groove after heat fusion, increase the contact area between the third connecting portion 27 and the combined groove after heat fusion, and stabilize the connection between the third connecting portion 27 and the first wall 22a after heat fusion.

[0141] like Figure 13 and Figure 14 As shown, in some embodiments, the position of the third connection portion 27 corresponds to the position of the support member 25, and the support member 25 is provided with a through hole 25b. The through hole 25b is used for the third connection portion 27 to pass through.

[0142] The position of the third connection portion 27 corresponds to the position of the support member 25, which means that along the depth direction of the first groove 28a, at least part of the projection of the third connection portion 27 on the first wall 22a is located within the projection of the support member 25 on the first wall 22a.

[0143] The through hole 25 b generally penetrates the support member 25 in a direction perpendicular to the first wall 22 a , and may also penetrate the support member 25 in other directions at an angle to the above direction, as long as the third connection portion 27 can pass through the support member 25 .

[0144] Since the width space of the first wall 22a is limited, the solution provided in this embodiment is adopted. On the one hand, the third connecting portion 27 and the support member 25 are located at the same position or approximately the same position on the first wall 22a, so that the structure inside the battery cell 20 is compact and does not affect the arrangement and installation of other structures; on the other hand, when the third connecting portion 27 is an insulator, in the event of thermal runaway of the battery cell 20, the third connecting portion 27 can be hot-melted and adhered between the support member 25 and the first wall 22a, thereby strengthening the connection between the support member 25 and the first wall 22a and reducing the risk of separation of the support member 25 and the first wall 22a in the event of thermal runaway of the battery cell 20.

[0145] In some embodiments, the size of the through hole 25 b is larger than that of the third connection portion 27 .

[0146] The size of the through hole 25b is larger than the size of the third connection portion 27, which means that the size of the through hole 25b in at least one direction is larger than the size of the third connection portion 27. It can be understood that the above direction refers to the direction other than the depth direction of insertion.

[0147] This makes it easier for the third connection portion 27 to pass through the through hole 25 b, thereby improving the assembly efficiency of the battery cell 20 .

[0148] In some embodiments, the through hole 25b is a circular hole, and the third connecting portion 27 is a cylinder.

[0149] The cylindrical shape of the third connecting portion 27, as opposed to the prismatic structure of the third connecting portion 27, allows the third connecting portion 27 to pass through the through hole 25b without having 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 portion 27, facilitating the passage of the third connecting portion 27.

[0150] In some embodiments, the diameter D1 of the third connecting portion 27 is 1 mm-5 mm.

[0151] The third connection portion 27 adopts the size provided in this embodiment, which can ensure that the third connection portion 27 has a certain supporting strength and will not affect the installation of other components due to its large size. At the same time, it can ensure a certain positioning effect, achieving multiple goals at one stroke.

[0152] In some embodiments, the inner diameter D2 of the through hole 25 b and the diameter D1 of the third connecting portion 27 satisfy: 0<D2−D1≤1 mm.

[0153] The inner diameter of the through hole 25 b is within the range provided in this embodiment, which facilitates the passage of the third connecting portion 27 while not making the size of the through hole 25 b larger and affecting the supporting strength of the supporting member 25 .

[0154] like Figure 13 As shown, in some embodiments, a reinforcement portion 29 is provided on the third connection portion 27. The reinforcement portion 29 is used to enhance the mechanical strength of the third connection portion 27.

[0155] The reinforcement portion 29 may be integrally formed on the third connecting portion 27, or may be connected to the third connecting portion 27 by plugging, bonding, or the like. The reinforcement portion 29 may be a single component or multiple components, and may be of a regular or irregular shape, as long as it can enhance the mechanical strength of the third connecting portion 27.

[0156] Since the third connection portion 27 needs to have a certain mechanical strength, the solution provided in this embodiment can improve the mechanical strength of the third connection portion 27 to a certain extent.

[0157] like Figure 15 As shown, Figure 15 Schematic diagram of a partial structure of an insulating member in a battery cell according to some embodiments of the present application. In some embodiments, the reinforcing portion 29 includes an annular portion 291 and a protrusion 292. The annular portion 291 surrounds the outer 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.

[0158] The annular portion 291 can be integrally formed with the third connecting portion 27 or separately formed from the third connecting portion 27. The protrusion 292 can be integrally formed with the annular portion 291 and the insulating member 24 or separately formed 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 multiple components, depending on the specific application. The protrusion 292 can be a ridge, a bump, or the like, depending on the specific application.

[0159] The annular portion 291 is connected to the outer peripheral wall of the third connecting portion 27, which can increase the thickness of at least a portion of the third connecting portion 27, thereby increasing the mechanical strength of the portion of the third connecting portion 27 provided with the annular portion 291. The protrusion 292 can further increase the thickness of the annular portion 291 and a portion of the third connecting portion 27, thereby increasing the mechanical strength of the portion 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 provide stable support for the third connecting portion 27.

[0160] In some embodiments, the insulating member 24 is provided with a receiving groove 24b, and at least a portion of the supporting member 25 is located in the receiving groove 24b.

[0161] The receiving groove 24b is a groove body for receiving at least part of the support member 25. It can be directly manufactured when preparing the insulating member 24, or it can be manufactured by cutting, stamping, etc. after the insulating member 24 is formed. The size of the receiving groove 24b can be determined according to the size of the support member 25 and its usage requirements.

[0162] By adopting the solution provided in this embodiment, the volume of the assembly of the insulating member 24 and the supporting member 25 can be reduced, which facilitates the miniaturization design of the battery cell 20 .

[0163] In some embodiments, the reinforcement portion 29 is located in the receiving groove 24b and connected to the bottom wall of the receiving groove 24b.

[0164] The receiving groove 24b is a three-dimensional space with a certain height, length, and width, and is surrounded by a bottom wall and a plurality of side walls. The bottom wall is the surface of the receiving groove 24b that faces the first wall 22a.

[0165] Since the annular portion 291 and the convex portion 292 of the reinforcing portion 29 can be integrally formed with the insulating member 24 or separately provided from 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 convex portion 292 being connected to the bottom wall of the receiving groove 24b, and the connection can be achieved in a variety of ways. For example, when the annular portion 291 and the convex portion 292 are integrally formed with the insulating member 24, at least one of the annular portion 291 and the convex portion 292 is integrally connected to the bottom wall of the receiving groove 24b. When the annular portion 291 and the convex portion 292 that is connected to the insulating member 24 is separately provided from the insulating member 24, the two can be connected by gluing, welding, plug-in connection, etc.

[0166] The reinforcing portion 29 is located in the accommodating groove 24b and is connected to the bottom wall of the accommodating groove 24b. The arrangement of the reinforcing portion 29 can prevent the thickness of the insulating component 24 from increasing, making the structure in the battery cell compact and not occupying the original design space of the electrode assembly. At the same time, the relative position of the reinforcing portion 29 and the accommodating groove 24b is stable, thereby strengthening the mechanical strength of the third connecting portion 27 while providing better support for the third connecting portion 27.

[0167] 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.

[0168] As previously mentioned, the receiving groove 24b is formed by a bottom wall and multiple side walls. The side wall in which at least one protrusion 292 is connected to the side wall of the receiving groove 24b refers to any one or more side walls that enclose the receiving groove 24b, and the specific side walls can be determined based on usage needs. It is understood that when multiple protrusions 292 are connected to multiple side walls, or when the same protrusion 292 is connected to multiple side walls, the support strength of the reinforcing portion 29 is greater than the support strength when a single protrusion 292 is connected to a single side wall.

[0169] Multiple protrusions 292 are provided and spaced apart along the outer circumferential wall of the annular portion 291. This allows the protrusions 292 to provide support for the annular portion 291 at multiple angles, thereby enabling the reinforcement portion 29 to provide support for the third connecting portion 27 at multiple angles. Furthermore, at least one protrusion 292 is connected to the sidewall of the receiving groove 24b, further improving the connection stability between the reinforcement portion 29, the receiving groove 24b, and the insulating member 24, while also strengthening the support provided by the reinforcement portion 29 to the third connecting portion 27.

[0170] In some embodiments, the support member 25 has an opening 25 c disposed toward the bottom wall of the accommodating groove 24 b , and the opening 25 c is communicated with the first exhaust channel 25 a to form an exhaust cavity.

[0171] Opening 25c can be formed by removing a portion of the sidewall of first exhaust channel 25a after support member 25 is formed, or it can be formed directly on support member 25 during its fabrication. This opening 25c connects first exhaust channel 25a with the space outside support member 25. Furthermore, through this opening 25c, a welding beam can enter first exhaust channel 25a and contact the portion of support member 25 that contacts first wall 22a, thereby achieving welding between support member 25 and first wall 22a. Therefore, the solution provided in this embodiment facilitates the welding operation between support member 25 and first wall 22a.

[0172] In some embodiments, at least a portion of the reinforcement 29 is located within the exhaust cavity.

[0173] It will be appreciated that to facilitate the entry of the reinforcement portion 29 into the first exhaust passage 25a through the opening 25c, the cross-sectional dimensions of the opening 25c are generally larger than those of the reinforcement portion 29. For example, if the opening 25c is rectangular and the reinforcement portion 29 is cylindrical, the width of the opening 25c is greater than the diameter of the reinforcement portion 29. Positioning at least a portion of the reinforcement portion 29 within the exhaust cavity minimizes the limitation of the space between the support member 25 and the bottom wall of the receiving groove 24b in the placement of the reinforcement portion 29, thereby ensuring that the reinforcement effect of the reinforcement portion 29 meets the required requirements.

[0174] In some embodiments, the third connection portion 27 is integrally formed with the insulating member 24 .

[0175] The third connecting portion 27 and the insulating member 24 are integrally formed, which means that the third connecting portion 27 and the insulating member 24 are combined together through a single processing or casting process to form a complete article. This solution can ensure a stable connection between the third connecting portion 27 and the insulating member 24 and facilitate processing.

[0176] like Figure 16 As shown, 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 located on a side of the first support portion 251 facing away from the first wall 22a and is connected to the first support portion 251. The second support portion 252 and the first support portion 251 enclose a first exhaust passage 25a.

[0177] 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 portion of the support member 25 used to connect with the first wall 22a, and the second support portion 252 is the portion of the support member 25 that does not contact the first wall 22a and is located on the first support portion 251 away from the first wall 22a.

[0178] The first support portion 251 and the second support portion 252 can each be composed of one component, such as a sheet or a plate, or can each be composed of multiple components, such as two spaced-apart sheets or plates, etc., depending on the specific needs of use.

[0179] The first support portion 251 and the second support portion 252 may be integrally formed or may be two separately prepared components, which may be connected by welding, plugging, or the like.

[0180] The supporting member 25 adopts the structure provided in this embodiment, which is simple in structure and easy to process.

[0181] like Figure 16 As shown, 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.

[0182] The first sheet 2521 and the second sheet 2522 are respectively part of the second supporting portion 252 , and the two can be integrally formed or can be two separately prepared sheets connected by welding, plugging, or the like.

[0183] The second supporting portion 252 adopts the structure provided in this embodiment, which has a simple structure and is easy to process.

[0184] In some embodiments, the second sheet 2522 and the first sheet 2521 can be deformed under an external force to form an exhaust channel with a triangular cross-section together with at least a portion of the first support portion 251 .

[0185] In this embodiment, the second sheet 2522 can be tilted toward the side of the first support portion 251 under the action of the upward thrust, thereby forming an exhaust passage with a triangular cross-section with the first sheet 2521 and at least a portion of the first support portion 251. It is understood that the above-mentioned triangle can be a closed triangle or a triangle with an opening 25c. The triangle with an opening 25c means that the second sheet 2522 and the first support portion 251 do not contact each other, and there is a gap between them to form the opening 25c.

[0186] By adopting the solution provided in this embodiment, in the case of thermal runaway, when the electrode assembly 23 moves toward the first wall 22a, the second sheet 2522 will not fit against the first support portion 251 to squeeze out the first exhaust channel 25a. 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 case of thermal runaway to a certain extent.

[0187] like Figure 16 As shown, in some embodiments, two second support portions 252 are provided, and the two second support portions 252 are spaced apart and disposed at both ends of the first support portion 251 .

[0188] The term "spaced arrangement" means that there is a certain interval between the two second support portions 252. The term "separated at both ends of the first support portion 251" means that the two second support portions 252 are respectively arranged at the two ends of the first support portion 251 in the length direction.

[0189] By adopting the structure provided in this embodiment, the opening 25 c can be formed between the two second support portions 252 , so as to facilitate welding of the support member 25 and the first wall 22 a .

[0190] In some embodiments, the support member 25 is formed by bending a sheet, which can stabilize the connection structure of each part of the support member.

[0191] In some embodiments, the support member 25 is connected to the first wall 22a.

[0192] The support member 25 and the first wall 22a can be connected by welding, integral molding, or the like.

[0193] In this way, after the insulating member 24 is melted, the position of the supporting member 25 does not change, so that it can still be supported between the first wall 22a and the main body 23b of the electrode assembly 23 to ensure the exhaust effect of the first exhaust channel 25a.

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

[0195] Adhesion is a method of firmly connecting the support member 25 and the first wall 22a by the adhesion force generated by an adhesive on a solid surface. In this embodiment, the support member 25 and the first wall 22a can be made of the same material or different materials.

[0196] The bonding of the support member 25 and the first wall 22a can form a continuous interfacial connection between the two to reduce stress concentration, ensure the strength of the support member 25 and the first wall 22a, and improve the fatigue life of the support member 25 and the first wall 22a, and the assembly cost of the two is low.

[0197] In some embodiments, the melting point of the support member 25 is greater than or equal to 300°C.

[0198] The melting point of the support member 25 is greater than or equal to 300° C., which can meet the use requirements in the case of thermal runaway of the battery cell 20 .

[0199] In some embodiments, the support member 25 is welded to the first wall 22a.

[0200] 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 support 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 specific application requirements.

[0201] The support member 25 is welded to the first wall 22a, which can ensure a stable connection between the two, facilitate operation, and facilitate mechanization and automation.

[0202] In some embodiments, the melting point of the support member 25 is within 100° C. of the melting point of the first wall 22 a .

[0203] 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 welding operations between the two.

[0204] In some embodiments, support members 25 are provided at opposite ends of the first space a.

[0205] Since the side of the first wall 22a facing the electrode assembly 23 is generally a rectangular surface with a certain length and width, the side of the electrode assembly 23 facing the first wall 22a can also be approximately regarded as a rectangular surface with a certain length and width, then the first space a can be approximately regarded as a cubic structure, and the opposite ends of the first space a refer to the two ends in the length direction of the first space a.

[0206] Compared with setting the support member 25 only at one place in the first space a, the solution provided in this embodiment can allow the gas on the side of the main body 23b of the electrode assembly 23 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, so that the battery cell 20 is safer to use and can ensure to a certain extent that both sides of the electrode assembly have good exhaust support.

[0207] In some embodiments, two supporting members 25 are respectively provided at two opposite ends of the first space a, and the two supporting members 25 provided at the same end are symmetrically arranged along the first center line L1 in the longitudinal direction of the first wall 22 a.

[0208] 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 .

[0209] In some embodiments, the third connection portion 27 is integrally formed with the insulating member 24 .

[0210] The third connecting portion 27 and the insulating member 24 can be made by an integral forming process such as casting, molding, bending, etc. Integral forming of the two can ensure a stable connection between the two and facilitate processing.

[0211] According to some embodiments of the present application, the present application further provides a battery, comprising a battery cell 20 according to any of the above solutions.

[0212] The battery provided in the embodiments of the present application, including the battery cell 20 provided in any of the above embodiments, can continuously maintain the connection 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, thereby reducing the risk of cracking on the side of the battery cell 20 to a certain extent and improving the safety of the use of the battery cell 20.

[0213] According to some embodiments of the present application, the present application further provides an electrical device, comprising a battery according to any of the above solutions, and the battery is used to provide electrical energy to the electrical device.

[0214] The power-consuming device may be any of the aforementioned devices or systems using batteries.

[0215] The electrical device provided in the embodiments of the present application, including the battery provided in any of the above embodiments, can continuously maintain the connection between the side cavity of the battery cell 20 and the pressure relief mechanism 22b at various stages of thermal failure, thereby achieving rapid pressure relief, thereby reducing the risk of cracking on the side of the battery cell 20 and improving the safety of the battery cell 20, the battery, and the electrical device.

[0216] like Figures 3 to 16 As shown, according to some embodiments of the present application, a battery cell 20 is provided. The battery cell 20 includes a shell 20', an electrode assembly 23, an insulating member 24, a support member 25 and an electrode terminal 26. The shell 20' has a first wall 22a, a second wall 22c and a pressure relief mechanism 22b. The pressure relief mechanism 22b is arranged on the first wall 22a. The first wall 22a and the second wall 22c are arranged to intersect. The electrode assembly 23 is arranged in the shell 20'. A first space a is formed between the outer peripheral wall of the electrode assembly 23 and the 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 arranged in the shell 20', and at least a portion of the insulating member 24 is located in the first space a. A second exhaust channel 24a is provided on the insulating member 24. The second exhaust channel 24a connects the first space a and the second space b.

[0217] The support member 25 is disposed in the housing 20', and at least a portion of the support member 25 is located in the first space a. A first exhaust passage 25a is provided on the support member 25. The first exhaust passage 25a is used to connect the first space a and the second space b.

[0218] The electrode terminal 26 is disposed on the first wall 22a and spaced apart from the pressure relief mechanism 22b along the first direction X. A portion of the electrode terminal 26 is located in the first space a and connected to the electrode assembly 23 , while another portion passes through the first wall 22a and extends outside the housing 20 ′.

[0219] In the first direction X, at least a portion of the first projection of the first exhaust channel 25a on the second wall 22c is located outside the second projection of the electrode terminal 26 on the second wall 22c. The area of ​​the portion of the first projection outside the second projection is greater than or equal to 5 mm. 2 .

[0220] The insulating member 24 is provided with a third connecting portion 27 connected to the first wall 22a. A first groove 28a is defined on the side of the first wall 22a facing the insulating member 24. 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 an inserting portion 271. The inserting portion 271 is inserted into the first groove 28a.

[0221] A second groove 28b is formed on the sidewall of the first groove 28a. The second groove 28b forms a combined groove with the first groove 28a. The combined groove is used to accommodate the third connecting portion 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.

[0222] The position of the third connecting portion 27 corresponds to that of the support member 25. The support member 25 is provided with a through hole 25b for the third connecting portion 27 to pass through. The third connecting portion 27 is cylindrical. The diameter D1 of the third connecting portion 27 is between 1 mm and 5 mm. The cross-section of the through hole 25b is circular, and the inner diameter of the through hole 25b satisfies the following: 0 < D2 - D1 ≤ 1 mm, where D2 is the inner diameter of the through hole 25b.

[0223] A reinforcement portion 29 is provided on the third connection portion 27. The reinforcement portion 29 is used to strengthen the mechanical strength of the third connection portion 27. The reinforcement portion 29 includes an annular portion 291 and a convex portion 292. The annular portion 291 surrounds the third connection portion 27 to form a closed structure. The convex portion 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 support member 25 is located in the receiving groove 24b. At least a portion of the third connection portion 27 is located in the receiving groove 24b. At least one of the annular portion 291 and the convex portion 292 is connected to the bottom wall of the receiving groove 24b. A plurality of convex portions 292 are provided. A plurality of convex portions 292 are arranged at intervals along the outer peripheral wall of the annular portion 291, and at least one convex portion 292 is connected to the side wall of the receiving groove 24b.

[0224] The support member 25 has an opening 25c disposed toward the bottom wall of the receiving groove 24b. The opening 25c is connected to the first exhaust passage 25a to form an exhaust cavity. The support member 25 is formed by bending a sheet to form a Figure 16 The structure shown.

[0225] 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 that is resistant to high temperatures above 300°C. 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, so that the melting point of the material of the support member 25 is close to that of the end cap, and the error is within 100°C. The material of the support member 25 can be aluminum, stainless steel SUS304, SUS430, 305, 316, etc.

[0226] The insulating member 24 has bosses at both ends, each of which is provided with a receiving groove 24b. Each receiving groove 24b is provided with a support member 25. Each receiving groove 24b is provided with two support members 25. The two support members 25 in the same receiving groove 24b are symmetrically arranged along the first centerline L1 of the first wall 22a. The first centerline is the centerline along the length of the first wall 22a. The support members 25 in different receiving grooves 24b do not need to be symmetrical.

[0227] The electrode terminal 26 can be a post 26a or a combination of a post 26a and an adapter 26b. A portion of the post 26a is located within the first space a and connected to the electrode assembly 23, while the remaining portion extends through the first wall 22a and out of the housing 20'. The adapter 26b is located within the first space a and connects the post 26a to the electrode assembly 23 via the adapter 26b. The post 26a has a dimension in the second direction Y, which is perpendicular to the first direction X, of 10 mm to 40 mm.

[0228] The third connection portion 27 is integrally formed with the insulating member 24 .

[0229] The battery cells provided in the embodiments of the present application are suitable for situations where the electrode terminals (e.g., poles) protrude beyond the first wall. This is because protrusion of the electrode terminals (e.g., poles) beyond the first wall would block the exhaust path from the side cavity to the explosion-proof valve area. Since the electrode terminals are generally centered, the center of the support member should be offset relative to the centerline.

[0230] In this embodiment, the insulating member can be made of common polypropylene (PP). The supporting member is a metal bracket with a U-shaped structure, which is aligned with the electrode terminals. It can continuously support and ensure that the side cavity of the battery cell and the bottom of the explosion-proof valve are connected in the late stage of thermal runaway.

[0231] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: a housing having a first wall, a second wall, a pressure relief mechanism, and an electrode terminal, wherein the pressure relief mechanism and the electrode terminal are both disposed on the first wall, and the electrode terminal and the pressure relief mechanism are spaced apart along a first direction, and the first wall and the second wall are intersecting; an electrode assembly disposed in the housing; a first space is formed between the electrode assembly and the first wall; and the second wall is disposed at least on one side of the electrode assembly along the first direction and forms a second space between the second wall and the electrode assembly; as well as a support member disposed in the housing, with at least a portion of the support member located in the first space and between the second space and the pressure relief mechanism, and a first exhaust passage being provided on the support member; Wherein, along the first direction, at least a portion of a first projection of the first exhaust channel on the second wall is located outside a second projection of the electrode terminal on the second wall.

2. The battery cell according to claim 1, wherein The area of ​​the portion of the first projection outside the second projection is greater than or equal to 5 mm 2 .

3. The battery cell according to claim 1, wherein The electrode terminal includes a first connecting portion and a second connecting portion, wherein at least a portion of the first connecting portion is located in the first space and connected to the electrode assembly, and at least a portion of the second connecting portion is located outside the housing and connected to the first connecting portion; Along the first direction, at least a portion of the first projection is located outside a projection of the first connecting portion on the second wall.

4. The battery cell according to claim 3, wherein: The electrode terminal further includes a transfer plate, the transfer plate is located in the first space, and the first connecting portion is connected to the electrode assembly through the transfer plate; Along the first direction, a projection of the combined structure of the adapter plate and the first connecting portion on the second wall is the second projection.

5. The battery cell according to claim 1, wherein: The battery cell further comprises: An insulating component is provided in the shell, and at least part of the insulating component is located in the first space, and a second exhaust channel is provided on the insulating component; the second exhaust channel connects the first space and the second space; a third connecting portion is provided on the insulating component, and the insulating component is connected to the first wall through the third connecting portion.

6. The battery cell according to claim 5, wherein: The third connecting portion is detachably connected to the first wall.

7. The battery cell according to claim 5, wherein: A first groove is provided on a surface of the first wall facing the insulating component. At least a portion of the third connecting portion protrudes toward the first wall to form an inserting portion. The inserting portion is inserted into the first groove.

8. The battery cell according to claim 7, wherein: A second groove is provided 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 to accommodate the third connecting portion after hot melting.

9. The battery cell according to claim 8, wherein: There are a plurality of second grooves, and the plurality of second grooves are spaced apart along the depth direction of the first groove.

10. The battery cell according to claim 5, wherein The position of the third connection portion corresponds to the position of the support member. The support member is provided with a through hole, and the through hole is used for the third connection portion to pass through.

11. The battery cell according to claim 10, wherein: The through hole has a size greater than that of the third connecting portion.

12. The battery cell according to claim 10, wherein: The through hole is a circular hole, and the third connecting portion is a cylinder.

13. The battery cell according to claim 12, wherein: The diameter of the third connecting portion is 1 mm-5 mm.

14. The battery cell according to claim 12, wherein: The inner diameter D2 of the through hole and the diameter D1 of the third connecting portion satisfy: 0<D2-D1≤1mm.

15. The battery cell according to claim 5, wherein: A reinforcement portion is provided on the third connecting portion.

16. The battery cell according to claim 15, wherein: The reinforcement portion includes an annular portion and a convex portion. The annular portion surrounds the outer peripheral wall of the third connecting portion to form a closed structure. The convex portion is provided on the outer wall of the annular portion and connected to the insulating component.

17. The battery cell according to claim 16, wherein: The insulating member is provided with a receiving groove, and at least a portion of the supporting member is located in the receiving groove.

18. The battery cell according to claim 17, wherein: The reinforcement portion is located in the accommodating groove and is connected to the bottom wall of the accommodating groove.

19. The battery cell according to claim 18, wherein There are a plurality of convex portions, which are spaced apart along the outer peripheral wall of the annular portion, and at least one of the convex portions is connected to the side wall of the accommodating groove.

20. The battery cell according to claim 17, wherein: The supporting member has an opening disposed toward the bottom wall of the accommodating groove, and the opening is communicated with the first exhaust channel to form an exhaust cavity.

21. The battery cell according to claim 20, wherein: At least a portion of the reinforcement portion is located within the exhaust cavity.

22. The battery cell according to any one of claims 5 to 21, characterized in that: The third connecting portion is integrally formed with the insulating member.

23. The battery cell according to any one of claims 5 to 21, characterized in that: The support member comprises: a first supporting portion connected to the first wall; and The second supporting portion is provided on a side of the first supporting portion away from the first wall and is connected to the first supporting portion. The second supporting portion and the first supporting portion form the first exhaust channel.

24. The battery cell according to claim 23, wherein: The second supporting portion includes: a first sheet disposed opposite to the first supporting portion; and The second sheet connects the first sheet and the first supporting portion.

25. The battery cell according to claim 24, wherein: There are two second supporting parts, which are spaced apart and respectively arranged at two ends of the first supporting part.

26. The battery cell according to any one of claims 1 to 21, characterized in that: The supporting member is formed by bending a sheet.

27. The battery cell according to any one of claims 1 to 21, characterized in that: The support member is connected to the first wall.

28. The battery cell according to any one of claims 1 to 21, characterized in that: The supporting member is bonded to the first wall.

29. The battery cell according to claim 28, wherein The supporting member has a melting point greater than or equal to 300°C.

30. The battery cell according to any one of claims 1 to 21, characterized in that: The support member is welded to the first wall.

31. The battery cell according to claim 30, wherein The melting point of the support member is within 100° C. of the melting point of the first wall.

32. The battery cell according to any one of claims 1 to 21, characterized in that: The supporting members are provided at opposite ends of the first space.

33. The battery cell according to claim 32, wherein: Two supporting members are respectively provided at two opposite ends of the first space, and the two supporting members provided at the same end are symmetrically arranged along a first center line in the longitudinal direction of the first wall.

34. A battery, characterized in that: A battery cell comprising the battery cell according to any one of claims 1 to 33.

35. An electrical device, characterized in that: Including the battery of claim 34.

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