Battery cells, batteries and electrical devices

Abstract

The present application provides a battery cell, a battery, and an electric device. The battery cell includes a housing, an electrode assembly, an electric energy extraction part, a pressure release mechanism, and a support member, the housing includes a first wall, the electrode assembly is installed in the housing, the electric energy extraction part is installed in the housing and connected to the electrode assembly, the pressure release mechanism is installed on the first wall, and the support member is installed in the housing, configured to prevent a pressure release hole formed in the pressure release mechanism from being blocked by the electric energy extraction part when the battery cell experiences thermal runaway. The support member according to the technical solution of the present application can prevent the battery cell from being unable to smoothly release gas and release pressure due to the pressure release hole formed in the pressure release mechanism being blocked by the electric energy extraction part when the battery cell experiences thermal runaway, thereby reducing the risk of fire or explosion caused by the pressure not being smoothly released when the battery cell experiences thermal runaway, and effectively improving the safety performance of the battery cell.

Description

[Technical field]

[0001] The present application is in the field of battery technology, and in particular, battery cells, batteries and electrical devices. [Background technology]

[0002] Energy conservation is very important for the sustainable development of the automotive industry. Electric vehicles are energy-saving and environmentally friendly, making them a key element for the sustainable development of the automotive industry. Battery technology is a key element for the development of electric vehicles. Summary of the Invention [Problem to be solved by the invention]

[0003] A challenge in battery technology is to improve the safety performance of batteries. [Means for solving the problem]

[0004] The present application provides a battery cell, a battery and an electric device, which can effectively improve the safety performance of the battery cell.

[0005] In a first aspect, the present application provides a battery cell, the battery cell including a housing, an electrode assembly, an electric energy extraction part, a pressure release mechanism, and a support member, the housing including a first wall, the electrode assembly disposed within the housing, the electric energy extraction part disposed within the housing and connected to the electrode assembly, the pressure release mechanism disposed on the first wall, and the support member disposed within the housing, configured to limit a pressure release hole formed in the pressure release mechanism from being blocked by the electric energy extraction part during thermal runaway of the battery cell.

[0006] In the battery cell according to the technical solution of the present application, a support member is installed in the housing, and when thermal runaway occurs in the battery cell, high-temperature and high-pressure gas generated in the housing flows toward the pressure release mechanism, at which time the pressure release mechanism is activated or destroyed, forming a pressure release hole for releasing the internal pressure or temperature, and when the electric energy take-off part installed in the housing is subjected to heat or force, it is likely to deform and the pressure release hole of the pressure release mechanism is blocked by the electric energy take-off part. The support member installed in the housing according to the present application effectively restricts the pressure release hole from being blocked by the deformed or moved electric energy take-off part, and prevents the problem that the battery cell cannot smoothly discharge gas and cannot release pressure due to the electric energy take-off part blocking the pressure release hole of the pressure release mechanism, thereby reducing the risk of fire or explosion due to pressure not being smoothly released when thermal runaway occurs in the battery cell, and effectively improving the safety performance of the battery cell.

[0007] In some embodiments of the present application, the melting point of the support member is greater than 200°C.

[0008] In the above technical solution, the melting point of the supporting member is above 200°C, which can reduce the damage to the structural stability of the supporting member caused by high temperature and high pressure gas, and effectively ensure the performance stability of the supporting member.

[0009] In some embodiments of the present application, the support member is a metal member.

[0010] In the above technical solution, the support member is a metal member. The metal support member has higher structural strength, which can effectively ensure the blocking and position limiting effect of the support member on the electric energy output portion. And the metal support member has a relatively high melting point, which can effectively ensure the structural stability of the support member in a high temperature environment.

[0011] In some embodiments of the present application, the battery cell further includes an insulating member, at least a portion of which is disposed between the first wall and the electrical energy extraction portion and configured to insulate and isolate the first wall and the electrical energy extraction portion, and the melting point of the support member is higher than the melting point of the insulating member, and the support member is configured to limit the pressure relief hole formed in the pressure release mechanism from being blocked by the electrical energy extraction portion in the event of thermal runaway of the battery cell after the insulating member melts.

[0012] In the above technical solution, an insulating member is installed inside the battery cell, and in normal use, the insulating member insulates and isolates the first wall and the electric energy extraction part, preventing abnormal short circuits in the battery cell. When thermal runaway occurs in the battery cell, the insulating member is likely to melt at high temperatures and lose its function of restricting the position of the electric energy extraction part. The support member restricts the position of the electric energy extraction part after the insulating member melts, and can restrict the pressure release hole of the pressure release mechanism from being blocked due to deformation or movement of the electric energy extraction part.

[0013] In some embodiments of the present application, the support member is secured to the first wall.

[0014] In the above technical solution, the support member is fixed to the first wall, so that the support member can be stably installed in the battery cell, thereby improving the connection stability of the support member and improving the stability of the support member when subjected to force.

[0015] In some embodiments of the present application, the support member is integrally formed with the first wall.

[0016] In the above technical solution, the support member and the first wall are integrally formed, which facilitates the manufacturing and assembly and effectively ensures the structural strength of the support member.

[0017] In some embodiments of the present application, the support member is disposed about the pressure release mechanism.

[0018] In the above technical solution, a support member is installed around the pressure release mechanism, thereby providing stable support around the pressure release mechanism and further improving the stability of the support member's support and positional restriction relative to the electrical energy extraction section.

[0019] In some embodiments of the present application, the support member includes a plurality of sub-support members disposed about the pressure release mechanism.

[0020] In the above technical solution, the support member includes a plurality of sub-support members disposed around the pressure release mechanism, the sub-support members play a role of supporting the electric energy extracting part at a plurality of positions, a gas discharge passage communicating with the pressure release mechanism is formed between two adjacent sub-support members, and the high-temperature and high-pressure gas can be discharged through the gas discharge passage via the pressure release mechanism.

[0021] In some embodiments of the present application, the support member includes a gas exhaust passageway disposed over the pressure release mechanism and communicating an interior space of the support member with an exterior space of the support member.

[0022] In the above technical solution, the support member is installed on the pressure release mechanism. The support member plays a protective role like a protective cover for the pressure release mechanism. In this way, on the one hand, the structural strength of the support member can be effectively guaranteed, and the stability of the support member when subjected to force can be effectively guaranteed. On the other hand, the support member is installed on the pressure release mechanism, which can reliably limit the blocking of the pressure release hole of the battery cell at the electric energy extraction part, and the support member is provided with a gas exhaust passage that communicates the internal space and the external space of the support member, so that when the battery cell is overheated, the gas in the battery cell can smoothly reach the pressure release mechanism through the gas exhaust passage, and the pressure release mechanism can smoothly release the pressure.

[0023] In some embodiments of the present application, the support member includes a first bottom wall and a first side wall, the first bottom wall and the pressure release mechanism are arranged opposite each other in the thickness direction of the first wall, a gap is formed between the first bottom wall and the pressure release mechanism, the first side wall is connected to each of the first bottom wall and the first wall, and a gas discharge passage is formed in the first side wall.

[0024] In the above technical solution, the first bottom wall and the first wall are installed opposite to each other, thereby forming a gap between the first bottom wall and the pressure release mechanism, and the first bottom wall is configured to extend to the electrode assembly, thereby limiting the pressure release mechanism from being blocked by the electrical energy output section; and the gas discharge passage is formed in the first side wall, thereby effectively reducing the risk of the gas discharge passage being blocked by the electrical energy output section, and effectively ensuring the smooth pressure release of the pressure release mechanism.

[0025] In some embodiments of the present application, the battery cell further includes an electrode lead-out portion installed on the first wall, the electrical energy extraction portion includes an adapter and a tab, the tab is connected to the electrode assembly, the adapter is installed between the first wall and the electrode assembly, the tab and the electrode lead-out portion are electrically connected via the adapter, and the support member is configured to limit blocking of the pressure release hole formed in the pressure release mechanism by the adapter in the event of thermal runaway of the battery cell.

[0026] In the above technical solution, the electrical energy extraction part includes an adapter and a tab, the tab may be integrally formed with the electrode assembly or may be connected by welding or other methods, and the adapter is configured to connect the tab and the electrode lead-out part. When thermal runaway occurs in the battery cell, the tab connected to the electrode assembly is likely to be deformed due to the impact force of high temperature and high pressure gas, which causes the adapter to deform and approach the pressure release mechanism in the first wall, and the deformed adapter is likely to block the pressure release hole formed in the pressure release mechanism, so that the airflow is blocked in the pressure release mechanism and cannot be discharged from the battery cell in a timely manner. The support member can limit the pressure release hole of the pressure release mechanism from being blocked by the adapter, thereby preventing the problem of the pressure release hole being blocked by the adapter due to the deformation of the adapter, effectively ensuring smooth and timely gas discharge during thermal runaway of the battery cell, reducing the risk of battery cell explosion, and effectively improving the safety performance of the battery cell.

[0027] In some embodiments of the present application, the adapter includes a reinforcing portion, and a projection of the reinforcing portion on the first wall and a projection of the support member on the first wall at least partially overlap in a thickness direction of the first wall.

[0028] In the above technical solution, a reinforcing part is provided on the adapter, which increases the structural strength of the adapter, making it difficult for the adapter to deform when thermal runaway occurs in the battery cell, thereby reducing the risk of the pressure release hole being blocked by the adapter. Furthermore, the projection of the reinforcing part on the first wall and the projection of the support member on the first wall at least partially overlap each other, so that when thermal runaway occurs in the battery cell, the reinforcing part on the adapter at least partially abuts against the support member, and the support member restricts the position of the adapter, effectively restricting the pressure release hole from being blocked by the adapter, thereby ensuring that the pressure release mechanism releases pressure normally, and the battery cell has a relatively high safety.

[0029] In some embodiments of the present application, the adapter includes a first connection portion and a second connection portion, the first connection portion is connected to the tab, the second connection portion is electrically connected to the electrode lead portion, and the reinforcing portion is installed on the first connection portion.

[0030] In the above technical solution, the adapter includes a first connection part and a second connection part, and the first connection part is connected to the tab. When thermal runaway occurs in the battery cell, the first connection part tends to approach the first wall when the tab is deformed. Therefore, by installing the reinforcing part on the first connection part, the first connection part becomes difficult to deform, and the reinforcing part can abut against the support member to prevent the first connection part from blocking the pressure release hole of the pressure release mechanism.

[0031] In some embodiments of the present application, the reinforcing portion is a first folded portion connected to an edge of the first connection portion, the first connection portion having a first surface facing the first wall and a second surface spaced apart from the first wall, and the first folded portion is configured to be folded to the first surface side or the second surface side.

[0032] In the above technical solution, the reinforcing portion is a first folded portion, and the first folded portion is folded to the third surface side, or the first folded portion is folded to the first surface side, which makes it easy to process and shape, and ensures that the strength of the reinforcing portion of the first connection portion is greater than the strength of other portions of the first connection portion.

[0033] In some embodiments of the present application, the first connection portion has a first surface facing the first wall and a second surface spaced apart from the first wall, and a protrusion is formed on the first surface or the second surface, the protrusion being a reinforcing portion.

[0034] In the above technical solution, the reinforcing part is a protrusion disposed on the adapter, which is easy to manufacture and process, and can effectively ensure the structural strength of the reinforcing part.

[0035] In some embodiments of the present application, the reinforcing portion is located on a side of the first connecting portion facing the first wall.

[0036] In the above technical solution, the reinforcing portion is located on the side of the first connection portion facing the first wall, thereby forming a gas discharge gap between the support member and the reinforcing portion, and when thermal runaway occurs in the battery cell, the gas discharge gap connects the pressure release hole to the inside of the battery cell. This makes it possible to avoid the reinforcing portion being located in the area where the first connection portion and the tab are connected, thereby preventing the connection between the adapter and the tab from being hindered.

[0037] In some embodiments of the present application, the battery cell further includes an insulating member, at least a portion of which is disposed between the first wall and the electrical energy extraction portion and configured to insulate the first wall from the electrical energy extraction portion, the insulating member including a third surface facing the first wall, a groove formed in the third surface, and at least a portion of the support member being accommodated in the groove.

[0038] In the above technical solution, the insulating member is configured to insulate and isolate the first wall and the electric energy output part, thereby preventing a short circuit caused by contact between the first wall and the electric energy output part. The provision of the groove not only ensures the insulating effect between the first wall and the electric energy output part, but also prevents the support member from occupying too much of the internal space of the battery cell, and effectively protects the energy density of the battery cell.

[0039] In some embodiments of the present application, the battery cell further includes an electrode lead-out portion installed on the first wall, the electrical energy extraction portion includes an adapter and a tab, the adapter is installed between the first wall and the electrode assembly, the tab is connected to the electrode assembly, and the tab and the electrode lead-out portion are electrically connected via the adapter, and the support member is installed on the adapter and configured to limit blocking of the pressure release hole formed in the pressure release mechanism by the adapter in the event of thermal runaway of the battery cell.

[0040] In the above technical solution, the electrical energy extraction part includes an adapter and a tab, the tab may be integrally formed with the electrode assembly or may be connected by welding or other methods, the adapter connects the tab and the electrode lead-out part, when thermal runaway occurs in the battery cell, the tab connected to the electrode assembly is easily deformed due to the impact force of high temperature and high pressure gas, so that the adapter is deformed and approaches the pressure release mechanism in the first wall, and the pressure release hole of the pressure release mechanism is easily blocked by the deformed adapter, so that the airflow is blocked in the pressure release mechanism and cannot be discharged from the battery cell in a timely manner. The support member can limit the pressure release hole formed in the pressure release mechanism from being blocked by the adapter when the battery cell thermal runaway occurs, thereby preventing the adapter from deforming and blocking the pressure release hole, effectively ensuring smooth and timely gas discharge when the battery cell thermal runaway occurs, reducing the risk of the battery cell explosion, and effectively improving the safety performance of the battery cell. Then, the support member is installed on the adapter. In this way, on the one hand, the structural strength of the adapter is increased by the support member, making it difficult for the adapter to be deformed due to thermal runaway of the battery cell, and on the other hand, if the support member is installed in the adapter, the space utilization rate of the support member can be effectively reduced, which is favorable for improving both the safety performance and the energy density of the battery cell.

[0041] In some embodiments of the present application, the adapter includes a first connection portion and a second connection portion, the first connection portion is connected to the tab, the second connection portion is connected to the electrode lead portion, and the support member is mounted to the first connection portion.

[0042] In the above technical solution, the adapter includes a first connection part and a second connection part, and the first connection part is connected to the tab. When thermal runaway occurs in the battery cell, the first connection part tends to approach the first wall when the tab deforms, and the pressure release hole formed in the pressure release mechanism is likely to be blocked due to the deformation of the first connection part when the battery cell experiences thermal runaway. By installing the support member on the first connection part, the deformation of the first connection part becomes difficult, and after the deformation of the first connection part, the support member can limit the first connection part from blocking the pressure release hole formed in the pressure release mechanism when the battery cell experiences thermal runaway.

[0043] In some embodiments of the present application, the first connection portion has a first surface facing the first wall and a second surface spaced from the first wall, and the support member has a recess formed on the first surface and a protrusion formed on the second surface at a location corresponding to the recess, and in the thickness direction of the first wall, a projection of the recess on the first wall can cover at least a portion of the pressure release mechanism.

[0044] In the above technical solution, the support member is molded on the first connection part, a recess is formed on the first surface, and a protrusion is formed on the second surface, and the projection of the recess on the first wall can cover at least a part of the pressure release mechanism. The support member having such a structure can effectively increase the structural strength of the first connection part and suppress deformation of the first connection part, and after the first connection part deforms to the first wall, the recess in the first connection part can ensure a certain degree of gap between the pressure release mechanism and the first connection part, thereby preventing the pressure release hole in the first connection part from being blocked when thermal runaway occurs in the battery cell, and allowing the pressure release mechanism to smoothly release pressure.

[0045] In some embodiments of the present application, the recess extends to an edge of the first connecting portion.

[0046] In the above technical solution, the recess extends to the edge of the first connection part, so that the space in the recess is directly connected to the space outside the edge of the first connection part. When thermal runaway occurs in the battery cell, gas can directly enter the recess through the edge of the first connection part and reach the pressure release mechanism, ensuring a smooth flow of gas.

[0047] In some embodiments of the present application, the battery cell further comprises a reinforcing member, at least a portion of the reinforcing member being disposed within the recess.

[0048] In the above technical solution, at least a portion of the reinforcing member is disposed within the recess, which can increase the structural strength of the support member and further improve the structural stability of the recess when subjected to force.

[0049] In some embodiments of the present application, the reinforcing member includes a second bottom wall and a second side wall, the second bottom wall being in close contact with the bottom surface of the recess, the second side wall being formed on an edge of the second bottom wall, and the second side wall being in close contact with the side surface of the recess.

[0050] In the above technical solution, the second bottom wall of the reinforcing member is in close contact with the bottom surface of the recess, and the second side wall of the reinforcing member is in close contact with the side surface of the recess, so that the supporting effect of the reinforcing member which conforms to the shape of the recess is relatively good, which effectively improves the structural strength of the entire supporting member and effectively improves the stability of the supporting member when subjected to force.

[0051] In some embodiments of the present application, the reinforcing member further includes a second folded portion, the second folded portion is connected to the second sidewall, and the second folded portion is located outside the recess and in intimate contact with the first surface.

[0052] In the above technical solution, the reinforcing member includes a bent portion that is in close contact with the first surface, and the arrangement of the bent portion improves the stability of the connection between the tab and the adapter and the stability when subjected to force, and also serves to support and reinforce the first connection portion. When thermal runaway occurs in the battery cell, the reinforcing member makes it more difficult for the first connection portion to deform, and improves the stability of the entire first connection portion when subjected to force.

[0053] In some embodiments of the present application, the first connection portion includes a main body region and a connection region, the connection region is connected to the tab, a convex portion is formed on the main body region, the connection region protrudes relative to the second surface, and a height of the portion of the convex portion protruding relative to the second surface is less than or equal to a height of the portion of the connection region protruding relative to the second surface.

[0054] In the above technical solution, the connection area is connected to the tab, and the protrusion is formed on the main area, so that the connection area between the connection area and the tab is not affected by the protrusion. The height of the protrusion protruding from the second surface is equal to or less than the height of the connection area protruding from the second surface, and the space occupied by the protrusion in the thickness direction is relatively small, so that the connection between the connection area and the tab is not affected under the premise of ensuring the strength of the support member.

[0055] In a second aspect, the present application provides a battery, the battery comprising a battery cell according to any of the above schemes.

[0056] In a third aspect, the present application further provides an electric device, comprising a battery cell according to any of the above schemes, the battery cell being for providing electric energy. [Brief description of the drawings]

[0057] In order to more clearly describe the technical solutions of the embodiments of the present application, the drawings used in the embodiments of the present application are briefly described below. The drawings described are only some embodiments of the present application. Those skilled in the art can obtain other related drawings based on these drawings without using inventive abilities.

[0058] [Figure 1] FIG. 1 is a schematic diagram of a vehicle according to some embodiments of the present application. [Diagram 2] FIG. 2 is an exploded view of a battery according to some embodiments of the present application. [Diagram 3] FIG. 3 is an exploded view of a battery cell according to some embodiments of the present application. [Figure 4] FIG. 4 is an exploded view illustrating a first wall, an adapter, and an insulating member of a battery cell according to some embodiments of the present application. [Diagram 5] FIG. 5 is a cross-sectional view of the first wall and the support member when thermal runaway occurs in a battery cell according to some embodiments of the present application. [Figure 6]FIG. 6 is an exploded view showing a first wall, an insulating member, and a support member of a battery cell according to some other embodiments of the present application. [Figure 7] FIG. 7 is a cross-sectional view of a first wall and a support member according to some other embodiments of the present application. [Figure 8] FIG. 8 is a schematic diagram of an adapter provided with a reinforcing portion according to some embodiments of the present application. [Figure 9] FIG. 9 is a schematic configuration diagram illustrating an unfolded state of a first bent portion in an adapter according to some embodiments of the present application. [Figure 10] FIG. 10 is a schematic configuration diagram illustrating a folded state of a first bent portion in an adapter according to some embodiments of the present application. [Figure 11] FIG. 11 is a partial cross-sectional view of a battery cell according to some embodiments of the present application. [Figure 12] FIG. 12 is a cross-sectional view showing a manner in which an insulating member and a supporting member are fitted together according to some embodiments of the present application. [Figure 13] FIG. 13 is a cross-sectional view showing a fitting manner between an insulating member and a supporting member according to some other embodiments of the present application. [Figure 14] FIG. 14 is a schematic diagram of an adapter in a deployed state according to some embodiments of the present application. [Figure 15] FIG. 15 is a perspective view illustrating an adapter according to some embodiments of the present application assembled to a battery cell. [Figure 16] FIG. 16 is a schematic diagram showing a fitting manner between an adapter and a reinforcing member according to some embodiments of the present application. [Figure 17] FIG. 17 is a front cross-sectional view illustrating a manner in which an adapter and a reinforcing member are fitted together according to some embodiments of the present application.

[0059] With respect to the drawings, the drawings are not necessarily drawn to scale. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0060] In order to more clearly describe the objectives, technical solutions and advantages of the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings used in the embodiments of the present application. The described embodiments are only some of the embodiments of the present application, but not all of the embodiments. The components in the embodiments of the present application shown in the drawings here can be arranged and designed in various arrangement ways.

[0061] Therefore, the following detailed description of the embodiments of the present application shown in the drawings is merely intended to illustrate selected embodiments of the present application, and does not limit the scope of the present application to be protected. Based on the embodiments of the present application, all other embodiments obtained by a person skilled in the art without using his / her inventive ability also belong to the protection scope of the present application.

[0062] Hereinafter, the embodiments of the technical solution of the present application will be described in detail with reference to the drawings. The following embodiments are merely illustrative for more clearly illustrating the technical solution of the present application, and are not intended to limit the scope of protection of the present application.

[0063] Unless otherwise specified, all technical and scientific terms used herein have the meanings that are commonly understood by those skilled in the art. The terms used herein are only for describing specific examples and are not intended to limit the present application. The terms "include", "have" and any variations thereof in the description of the present application, claims and the above drawings mean inclusive and non-exclusive.

[0064] In the description of the embodiments of the present application, technical terms such as "first", "second", etc. are merely used to distinguish different elements, and do not express or imply relative importance, imply the number of technical features, or stipulate a particular order or primary and secondary. In the description of the embodiments of the present application, unless otherwise specified, "plurality" means two or more.

[0065] When the term "embodiment" is used in this specification, it means that a particular feature, configuration, or characteristic described using the embodiment is included in at least one embodiment of the present application. When the term is used in various parts of the specification, it does not necessarily refer to the same embodiment, and it is not intended to limit independent or alternative embodiments that are mutually exclusive with other embodiments. It is understood by those skilled in the art that the embodiments described in this specification may be combined with other embodiments.

[0066] In describing the embodiments of the present application, the term "plurality" means two or more (including two).

[0067] In describing the embodiments of the present application, directions or positional relationships expressed by terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "up," "down," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are based on the drawings and are intended merely to simply and concisely describe the embodiments of the present application, and are not intended to expressly or imply that the relevant devices or elements necessarily have a specific orientation or are configured or operated in a specific direction, and therefore are not intended to limit the embodiments of the present application.

[0068] In the description of the embodiments of the present application, unless otherwise clearly defined or limited, technical terms such as "installation", "mounting", "linking", "connection", and "fixing" should be understood in a broad sense. For example, it may be a fixed connection, a removable connection, or an integral connection. It may be a mechanical connection, an electrical connection, or a signal connection. It may also be a direct connection, an indirect connection through an intermediate object, or the interiors of two elements may communicate with each other or the two elements may interact with each other. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present application according to the specific situation.

[0069] In the embodiments of the present application, like reference numerals denote like parts, and for the sake of simplicity, detailed descriptions of like parts in different embodiments will be omitted. The dimensions such as thickness, length, etc. of various parts in the embodiments of the present application shown in the drawings, and the dimensions such as thickness, length, width, etc. of the entire integrated device are merely for illustrative purposes and are not intended to limit the present application.

[0070] The battery described in the embodiments of the present application refers to a physical module including one or more battery cells, thereby providing higher voltage and capacity. The battery cells may be connected in series, in parallel, or in a manner including both. The battery further includes a housing for packaging the one or more battery cells. The housing can prevent liquids or other foreign objects from affecting the charging and discharging of the battery cells.

[0071] In the present application, the battery cell includes a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, or a magnesium ion battery, etc., and is not limited thereto in the embodiments of the present application. The battery cell may be cylindrical, laminated, rectangular, or have other shapes, and is not limited thereto in the embodiments of the present application.

[0072] The battery cell includes an electrode assembly and an electrolyte, and the electrode assembly is composed of a positive electrode plate, a negative electrode plate, and a separator. The battery cell functions mainly by the movement of metal ions between the positive electrode plate and the negative electrode plate. The positive electrode plate includes a positive electrode collector and a positive electrode active material layer, and the positive electrode active material layer is applied to the surface of the positive electrode collector, and the portion of the positive electrode collector where the positive electrode active material layer is not applied protrudes from the portion of the positive electrode collector where the positive electrode active material layer is applied, and the portion of the positive electrode collector where the positive electrode active material layer is not applied is a positive electrode tab. For example, in a lithium-ion battery, the material of the positive electrode collector is aluminum, and the positive electrode active material is lithium cobalt oxide, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative electrode plate includes a negative electrode collector and a negative electrode active material layer, the negative electrode active material layer is applied to the surface of the negative electrode collector, the negative electrode active material layer is not applied to the negative electrode collector part protrudes from the negative electrode active material layer applied to the negative electrode collector part, and the negative electrode active material layer is not applied to the negative electrode collector part. The material of the negative electrode collector may be copper, and the negative electrode active material may be carbon-based or silicon-based. In order to ensure that they do not melt when a large current flows, both the positive electrode tab and the negative electrode tab are laminated in multiple pieces. The material of the separator is PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly may be a wound type structure or a laminated type structure, and the embodiment of the present application is not limited thereto.

[0073] When thermal runaway occurs in battery cells, they are prone to ignition and explosion, posing a relatively large safety risk, so improving the safety performance of batteries is one of the challenges in the development of battery technology.

[0074] The inventors have devised through their research that if a pressure release mechanism is installed in a battery cell in order to effectively improve the safety performance of the battery cell, when the pressure or temperature inside the battery cell suddenly rises due to thermal runaway of the battery cell, the pressure release mechanism will be activated to form a pressure release hole. The pressure release hole will connect the inside and outside of the battery cell, allowing the internal pressure of the battery cell to be released to the outside in a timely manner, thereby preventing explosion or fire of the battery cell and effectively improving the safety performance of the battery cell.

[0075] However, the inventors have realized that even if a pressure release mechanism is provided in the battery cell, it does not effectively solve the problem of the battery cell being susceptible to ignition or explosion due to thermal runaway.

[0076] According to the inventors' analysis, the cause is that an electric energy extraction part is installed inside the battery cell so that electric energy generated in the electrode assembly can be extracted from the battery cell through the electric energy extraction part, and an insulating member is further provided inside the battery cell to insulate and isolate the housing from the electric energy extraction part. When thermal runaway occurs in the battery cell, the pressure release mechanism is activated to form a pressure release hole, the insulating member melts, and the high-temperature, high-pressure gas inside the battery cell impacts the electric energy extraction part in the process of flowing toward the pressure release mechanism. As a result, at least a part of the electric energy extraction part moves toward the pressure release hole due to the influence of the high temperature and gas acting force, and since it is no longer blocked by the insulating member, the electric energy extraction part covers the pressure release hole and deforms at the location corresponding to the pressure release hole. Part of the deformed electric energy extraction part enters and blocks the pressure release hole, so that the internal pressure of the battery cell cannot be released timely and effectively, leading to an explosion or fire of the battery cell.

[0077] In consideration of the above-mentioned causes, and to solve the problem of poor safety performance of a battery cell caused by the electrical energy extraction part deforming and blocking the pressure release hole, the inventors designed a battery cell in which a support member is installed within the housing body of the battery cell, which can limit the pressure release hole formed in the pressure release mechanism from being blocked by the electrical energy extraction part in the event of thermal runaway of the battery cell.

[0078] When thermal runaway occurs in the battery cell, the internal pressure of the battery cell is released by the pressure release mechanism, causing high-temperature, high-pressure gas to flow into the pressure release mechanism, and the electrical energy extraction portion is easily deformed due to the temperature and acting force of the high-temperature, high-pressure gas. The support member effectively limits the pressure release hole from being blocked by the deformed or moved electrical energy extraction portion, preventing the problem of the battery cell being unable to smoothly discharge gas and release pressure due to the electrical energy extraction portion blocking the pressure release hole. This reduces the risk of fire or explosion due to pressure not being released smoothly when thermal runaway occurs in the battery cell, and effectively improves the safety performance of the battery cell.

[0079] The battery cells according to the embodiments of the present application can be applied to, but are not limited to, electric devices such as vehicles, ships, and aircraft, etc. The battery cells, batteries, etc. according to the present application can be used to configure the power supply system of the electric devices.

[0080] The embodiment of the present application provides an electric device that uses a battery as a power source. The electric device includes, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, an electric car, an electric vehicle, a boat, an aircraft, etc. The electric toy can be stationary or mobile, and includes, for example, a game console, an electric car toy, an electric boat toy, an electric plane toy, etc. The aircraft can include an airplane, a rocket, a space shuttle, and a spaceship, etc.

[0081] The battery according to the embodiment of the present application can be applied not only to the above electric device but also to all electric devices using a battery. For convenience of explanation, in the following embodiment, a vehicle is used as an example to explain an electric device according to an embodiment of the present application.

[0082] FIG. 1 is a schematic diagram of a vehicle 1000 according to some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a natural gas vehicle, or a new energy vehicle, and the new energy vehicle may be an electric vehicle, a hybrid vehicle, or a range-extended electric vehicle, etc. A battery 100 is disposed inside the vehicle 1000, and the battery 100 is disposed at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000, for example, as a power source for driving the vehicle 1000. The vehicle 1000 further includes a control device 200 and an engine 300, and the control device 200 controls the power supply from the battery 100 to the engine 300, for example, used to supply work electricity during starting, navigation, and running of the vehicle 1000.

[0083] In some other embodiments, the battery 100 can be used not only as a power source for steering the vehicle 1000, but also as a traction power source to provide driving power to the vehicle 1000 in place of or in part in place of gasoline or natural gas.

[0084] FIG. 2 is an exploded view of a battery 100 according to some embodiments of the present application. The battery 100 includes a housing 10 and a battery cell 20, and the battery cell 20 is housed in the housing 10. The housing 10 provides a housing space for the battery cell 20, and various configurations may be used. In some embodiments, the housing 10 includes a first portion 11 and a second portion 12, and the first portion 11 and the second portion 12 together define a housing space for housing the battery cell 20. The second portion 12 has a hollow structure with one end open, the first portion 11 has a plate-like structure, and the first portion 11 is covered so as to cover the open side of the second portion 12, and the first portion 11 and the second portion 12 define the housing space. The first portion 11 and the second portion 12 each have a hollow structure with one side open, and the open side of the first portion 11 may be covered so as to cover 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 rectangle or a cube.

[0085] The battery 100 may have a plurality of battery cells 20, and the plurality of battery cells 20 may be connected in series, in parallel, or in a manner including both, and "connected in a manner including both" means that among the plurality of battery cells 20, some are connected in series and some are connected in parallel. The plurality of battery cells 20 can be connected in direct series or in parallel, or in a manner including both.

[0086] 3 to 5, FIG. 3 is an exploded view of a battery cell according to some embodiments of the present application, FIG. 4 is an exploded view showing a first wall, an adapter, and an insulating member of the battery cell according to some embodiments of the present application, and FIG. 5 is a cross-sectional view of the first wall and the support member when thermal runaway occurs in the battery cell according to some embodiments of the present application. A battery cell 20 according to some embodiments of the present application includes a housing 21, an electrode assembly 25, an electric energy extraction unit 24, a pressure release mechanism 22, and a support member 26. The housing 21 includes a first wall 213, and the pressure release mechanism 22 is installed on the first wall 213. The electrode assembly 25 is installed in the housing 21, and the electric energy extraction unit 24 is installed in the housing 21 and connected to the electrode assembly 25. The support member 26 is installed inside the housing 21 and is configured to limit the pressure relief hole 221 formed in the pressure relief mechanism 22 from being blocked by the electrical energy extraction portion 24 in the event of thermal runaway of the battery cell 20 .

[0087] The housing 21 is a component for accommodating the electrode assembly 25. The housing 21 may have various shapes such as a cylindrical shape, a rectangular parallelepiped shape, etc. The housing 21 includes a housing body 211 and a lid body 212. The lid body 212 is provided so as to cover an opening of the housing body 211, and the lid body 212 and the housing body 211 define a sealed space.

[0088] The housing body 211 may be a hollow structure with one end open or with opposite ends open, and may be made of various materials such as copper, iron, aluminum, steel, and aluminum alloys.

[0089] The lid 212 is a component that closes the opening of the housing body 211 to isolate the internal environment of the battery cell 20 from the external environment. The lid 212 and the housing body 211 define an enclosed space that contains the electrode assembly 25, the electrolyte, and other components. The lid 212 is connected to the housing body 211 by welding or seaming so as to close the opening of the housing body 211. The shape of the lid 212 matches the shape of the housing 21. For example, when the housing body 211 has a rectangular parallelepiped structure, the lid 212 has a rectangular plate-like structure that matches the shape of the housing 21, and when the housing body 211 has a cylindrical shape, the lid 212 has a disk-like structure that matches the shape of the housing body 211. The lid 212 can be made of various materials such as copper, iron, aluminum, steel, and aluminum alloy.

[0090] The battery cell 20 may have one or two lid bodies 212. In an embodiment in which the housing body 211 has a hollow structure with both ends open, two lid bodies 212 are installed, and the two lid bodies 212 close the two openings of the housing body 211, respectively, and a sealed space is defined by the two lid bodies 212 and the housing body 211. In an embodiment in which the housing body 211 has a hollow structure with one end open, one lid body 212 is installed, and the lid body 212 closes the opening at one end of the housing body 211, and a sealed space is defined by the one lid body 212 and the housing body 211.

[0091] In some embodiments, the first wall 213 is the lid 212. Of course, the first wall 213 may be another side wall of the housing body 211.

[0092] The electrode assembly 25 is a component where an electrochemical reaction occurs in the battery cell 20. The electrode assembly 25 includes a positive electrode plate, a negative electrode plate, and a separator. The electrode assembly 25 may have a wound structure formed by winding a positive electrode plate, a separator, and a negative electrode plate, or the electrode assembly 25 may have a stacked structure.

[0093] The pressure release mechanism 22 is an element or component that releases the internal pressure or temperature of the battery cell 20. The pressure release mechanism 22 may take the form of an explosion-proof valve, an air valve, a pressure release valve, a safety valve, a notch provided in the housing 21, or the like, and may specifically be a pressure-sensitive element or a temperature-sensitive element, or a pressure-sensitive structure or a temperature-sensitive structure. That is, when the internal pressure or temperature of the battery cell 20 reaches a threshold value, the pressure release mechanism 22 is activated or a fragile structure provided in the pressure release mechanism 22 is destroyed, thereby forming a pressure release hole 221 for releasing the internal pressure or temperature of the battery cell.

[0094] The pressure relief hole 221 refers to a hole that is formed in the housing 21 when the battery cell experiences thermal runaway, and that allows the inside and outside of the battery cell to communicate with each other. The pressure relief hole can be formed by the operation of a pressure relief mechanism, and for example, when the internal pressure of the battery cell 20 exceeds a threshold, at least a part of the pressure relief mechanism is destroyed and the pressure relief hole 221 is formed.

[0095] Actions taken by pressure relief mechanism 22 include, but are not limited to, at least a portion of pressure relief mechanism 22 bursting, crushing, breaking, opening, etc.

[0096] As shown in FIG. 3, when the first wall 213 is a cover 212, the pressure release mechanism 22 can be installed in the cover 212.

[0097] The electric energy output part 24 is installed in the housing 21, connected to the electrode assembly 25, and plays a role of passing and collecting current. One end of the electric energy output part 24 is connected to the electrode assembly 25, and the other end is connected to the electrode lead part 23 installed in the housing 21. The electrode lead part 23 is a component that outputs electric energy of the battery cell 20, and electrically connects to the adjacent battery cell 20 or other conductive components. The electrode lead part 23 can be implemented in various forms. For example, the electrode lead part 23 may be an electrode terminal such as a sheet-like structure or a columnar structure installed in the housing 21, or may be a part or the whole of the first wall. As shown in FIG. 3, the electrode lead part 23 may be installed in the cover body 212, and in other embodiments, the electrode lead part 23 may be installed in the housing main body 211.

[0098] Referring to FIG. 3, in some embodiments of the present application, the electrical energy extraction portion 24 includes a tab 241, which is connected to the electrode assembly 25 by welding, bonding with a conductive adhesive, or the like.

[0099] Of course, the tab 241 may be an integral part of the electrode assembly 25, i.e., the portion of the plate that is not coated with an active material layer is formed as the tab 241. The tab may be a copper or aluminum foil having a relatively thin thickness.

[0100] 3, in some other embodiments, the electric energy output portion 24 includes a tab 241 and an adapter 242. As described above, the tab 241 is configured to be connected to the electrode assembly 25, and the adapter 242 is configured to connect the tab 241 and the electrode lead portion 23. The material of the adapter 242 is copper, aluminum, stainless steel, or the like.

[0101] The support member 26 may take various forms. For example, the support member 26 may be columnar, and the columnar support member 26 may be mounted on the first wall 213 and be located near the pressure release mechanism 22. Of course, the support member 26 may include multiple columnar structures, and the multiple columnar structures may be spaced apart from each other and positioned around the pressure release mechanism 22.

[0102] The support member 26 may be annular and disposed around the pressure release mechanism 22. A passage may be provided in the side wall of the annular support member 26, connecting the internal space of the annular support member 26 with the external space of the annular support member 26. When the electric energy take-off portion 24 abuts against the end face of the annular support member 26, the passage in the side wall of the support member 26 allows gas to smoothly enter the internal space of the annular support member 26 and be discharged through the pressure release mechanism 22. The annular support member 26 may be in the shape of a circular ring, an elliptical ring, a frame, or the like.

[0103] The support member 26 may be a kind of cover structure that covers the pressure release mechanism 22, and the cover structure has one or more through holes. When the electric energy take-off portion 24 is deformed and abuts against the support member 26, the support member 26 can restrict the electric energy take-off portion from approaching and blocking the pressure release hole 221, and the through holes in the support member 26 can allow the gas to smoothly enter the inner space of the annular support member 26 and be discharged through the pressure release mechanism 22.

[0104] When the support member 26 is fixedly installed to the first wall 213 and the electrical energy extraction portion 24 approaches the pressure release mechanism 22, the support member 26 can prevent the pressure release hole 221 formed in the pressure release mechanism 22 from being blocked by the electrical energy extraction portion 24 in the event of thermal runaway of the battery cell 20.

[0105] A support member 26 may be provided in the electric energy extraction portion 24. When a portion of the electric energy extraction portion 24 approaches the first wall 213, the support member 26 provided in the electric energy extraction portion 24 abuts against the first wall 213 and prevents the portion of the electric energy extraction portion 24 corresponding to the pressure release mechanism 22 from approaching further toward the pressure release mechanism 22. This ensures a gap between the first wall 213 and the electric energy extraction portion 24 through which gas can pass, and prevents the passage through which gas inside the battery cell flows to the pressure release hole 221 from being blocked by the electric energy extraction portion 24.

[0106] Of course, the support member 26 may be an independent member that is installed in and connected to the housing 21 and is located between the electric energy extraction portion 24 and the first wall 213. For example, the support member 26 is one or more position limiting posts that are connected to the inner wall of the housing body 211, and the position limiting posts protrude from the inner wall of the housing body 211. When a part of the electric energy extraction portion 24 is deformed and approaches the first wall 213, the support member 26 prevents the electric energy extraction portion from deforming toward the pressure release hole 221, thereby restricting the pressure release hole 221 formed in the pressure release mechanism 22 from being blocked by the electric energy extraction portion 24 when the thermal runaway of the battery cell 20 occurs.

[0107] The above does not list all the structures of the support member 26, and the support member 26 may have a different structure. The support member 26 only needs to realize the function of restricting the pressure release hole of the pressure release mechanism 22 from being blocked by the electric energy take-off part, in other words, only needs to secure a gap through which gas can pass between the first wall 213 and the electric energy take-off part 24. "The pressure release hole 221 formed in the pressure release mechanism 22 is blocked by the electric energy take-off part 24 when the battery cell 20 experiences thermal runaway" means that when thermal runaway occurs in the battery cell 20, at least a part of the electric energy take-off part 24 moves to the first wall to cover or block the pressure release hole formed in the pressure release mechanism 22, and as a result, the pressure release hole 221 formed in the pressure release mechanism 22 cannot communicate between the internal chamber of the housing 21 and the outside of the battery cell, or a part of the pressure release hole 221 is blocked by the electric energy take-off part 24, reducing the pressure release ability of the pressure release hole 221.

[0108] In the battery cell 20 according to the embodiment of the present application, a support member 26 is installed in the housing 21, and the support member 26 can restrict the pressure release hole 221 of the pressure release mechanism 22 from being blocked by the electric energy extraction part 24 when the battery cell 20 experiences thermal runaway. When thermal runaway occurs in the battery cell 20, high-temperature, high-pressure gas generated in the housing 21 flows toward the pressure release mechanism 22, and the electric energy extraction part 24 installed in the housing 21 is deformed or moved toward the first wall 213 due to the acting force of the heat and airflow, thereby blocking the pressure release hole 221 of the pressure release mechanism 22. In the present application, the support member 26 installed within the housing 21 effectively restricts the pressure release hole 221 of the pressure release mechanism 22 from being blocked by the deformed or moved electrical energy extraction part 24, thereby preventing the problem of high-temperature, high-pressure gas not being able to be discharged in a timely manner from the housing 21 due to the electrical energy extraction part 24 blocking the pressure release hole 221. This reduces the risk of an explosion due to gas not being discharged smoothly when thermal runaway occurs in the battery cell 20, and improves the safety performance of the battery cell 20.

[0109] In some embodiments of the present application, the melting point of the support member 26 is greater than 200°C.

[0110] The support member 26 may be made of a metal material with a high melting point, a ceramic material, or the like. The melting point of the support member 26 may be above 300°C, above 400°C, above 500°C, or the like, and may even be above 600°C or even higher. The higher the melting point of the support member 26, the better the structural stability in a high temperature and high pressure environment. A support member 26 with a high melting point can effectively ensure the stability of the function of the support member 26 when thermal runaway occurs in the battery cell 20.

[0111] In some embodiments of the present application, the support member 26 is a metal member.

[0112] The support member 26 may be made of a material such as copper, iron, aluminum, aluminum alloy, etc. In an embodiment in which the support member 26 is installed on the first wall 213, the support member 26 may be made of the same material as the first wall 213, which may contribute to the support member 26 being welded or integrally formed with the first wall 213. Of course, the support member 26 may be made of a material different from that of the first wall 213 and the electrical energy extraction portion 24. Exemplarily, the support member 26 is made of a metal material having a melting point of more than 200°C.

[0113] The support member 26 made of a metal material can provide higher structural strength, which can effectively ensure the blocking and position limiting effects on the electric energy output portion of the support member 26. Furthermore, the support member 26 made of a metal material can be fixed inside the housing 21, which contributes to the production and manufacturing of the battery cells 20.

[0114] 3 and 4, in some embodiments of the present application, the battery cell 20 further includes an insulating member 27. At least a portion of the insulating member 27 is disposed between the first wall 213 and the electric energy extraction portion 24, and is configured to insulate and isolate the first wall 213 and the electric energy extraction portion 24. The melting point of the support member 26 is higher than the melting point of the insulating member 27. The support member 26 is configured to limit the pressure release hole 221 formed in the pressure release mechanism 22 from being blocked by the electric energy extraction portion 24 during thermal runaway of the battery cell 20 after the insulating member 27 melts.

[0115] The material of the insulating member 27 may be plastic, such as PP (polypropylene) or PE (polyethylene), which is advantageous for reducing the weight of the battery cell 20 while ensuring the insulating effect.

[0116] "At least a portion of the insulating member 27 is installed between the first wall 213 and the electrical energy extraction portion 24" means that a portion of the structure of the insulating member 27 is located between the first wall 213 and the electrical energy extraction portion 24, or the entire structure of the insulating member 27 is located between the first wall 213 and the electrical energy extraction portion 24.

[0117] Generally, a through hole 274 is provided in the insulating member 27 at a location corresponding to the pressure release mechanism 22, and this through hole 274 allows the gas inside the battery cell 20 to smoothly reach the pressure release mechanism 22. However, when thermal runaway occurs in the battery cell 20, the temperature and pressure inside the battery cell 20 are relatively high, so that the insulating member 27 may melt, and the electrical energy extraction part 24 may partially deform and block the pressure release hole 221, preventing the gas inside the battery cell from flowing to the pressure release hole 221.

[0118] By installing the support member, when the battery cell 20 is in a normal state, the insulating member 27 insulates and isolates the first wall 213 and the electrical energy extraction portion 24, and when thermal runaway occurs in the battery cell 20, the insulating member 27 is likely to melt at high temperatures and the electrical energy extraction portion 24 is likely to deform. In this case, the support member 26 plays a supporting role between the electrical energy extraction portion 24 and the first wall 213 so as to form a passage for gas to pass between the electrical energy extraction portion 24 and the first wall 213. As a result, gas inside the battery cell 20 can pass through the passage and be discharged from the battery cell 20 via the pressure release mechanism 22, and the deformed or displaced electrical energy extraction portion 24 can be prevented from blocking the pressure release hole 221 of the pressure release mechanism 22.

[0119] In some embodiments of the present application, the support member 26 is secured to the first wall 213 .

[0120] Specifically, the first wall 213 includes an inner surface facing the electrode assembly 25, and the support member 26 is fixed to the inner surface of the first wall 213 and protrudes from the inner surface. There are various manners in which the support member 26 is fixed to the first wall 213. For example, the support member 26 may be integrally formed with the first wall 213, or may be formed separately from the first wall 213 and fixedly connected to the first wall 213 by welding, bonding with an adhesive, engagement, fastening with a fastening member, or the like. The support member 26 may be made of the same material as the first wall 213 so as to contribute to welding or integrally forming with the first wall 213, or may be made of a different material from the first wall 213. For example, the material of the first wall 213 may be aluminum, stainless steel, or aluminum alloy, and the material of the support member 26 may be ceramic.

[0121] The support member 26 is fixed to the first wall 213, thereby ensuring the stability of the connection of the support member 26, which in turn ensures the stability of the force received by the support member 26 and is advantageous in enabling the support member 26 to fully exert its limiting effect on the electrical energy extraction portion 24.

[0122] In some embodiments of the present application, the support member 26 and the first wall 213 are integrally formed.

[0123] The support member may be made of the same material as the first wall 213, and may be integrally formed with the first wall 213 by forging, casting, press molding, or the like.

[0124] The support member and the first wall 213 are integrally formed, which facilitates the manufacture and assembly of the battery cell 20 and effectively ensures the structural strength of the support member 26.

[0125] In some embodiments of the present application, a support member 26 is disposed about the pressure relief mechanism 22 .

[0126] As described above, the support member 26 may be annular and disposed around the pressure release mechanism 22. The annular support member 26 has one end fixedly connected to the first wall 213 and the other end extending to the electric energy take-off portion 24, and a passage is provided on the side wall of the annular support member 26 to communicate the inner space of the annular support member 26 with the outer space of the annular support member 26. When the electric energy take-off portion 24 is deformed and abuts against the end of the annular support member 26, the passage on the side wall of the support member 26 can effectively ensure that the gas can smoothly enter the inner space of the annular support member 26 and be discharged through the pressure release mechanism 22. The annular support member 26 may be in the shape of a circular ring, an elliptical ring, a rectangular frame, or the like.

[0127] Of course, the support member 26 may include multiple separate structures arranged around the pressure release mechanism 22, and the multiple separate structures may be arranged around the pressure release mechanism 22 at intervals, such that a passage is formed between two adjacent separate structures to connect the pressure release mechanism 22 to the outside of the support member 26, and when the electrical energy extraction portion 24 is deformed and abuts against some or all of the separate structures, the passage can effectively ensure that gas is smoothly discharged through the pressure release mechanism 22.

[0128] A support member 26 is disposed around the pressure release mechanism 22, thereby providing stable support around the pressure release mechanism 22 and further improving the stability of the support and positional restriction of the support member 26 relative to the electrical energy take-off portion 24.

[0129] Referring to Figures 4 and 5, Figure 5 is a front cross-sectional view of a first wall and support member according to some embodiments of the present application, in which the support member 26 includes a plurality of sub-support members 261 positioned around the pressure release mechanism 22.

[0130] Each sub-support member 261 may have a cylindrical structure, a hexahedral structure, a cone structure, a structure such as an arc-shaped protrusion 243b, etc., and a plurality of sub-support members 261 are arranged around the pressure release mechanism 22 at intervals. The sub-support member 261 is configured such that one end is integrally formed with or fixedly connected to the first wall 213, and the other end facing the first wall 213 extends to the electric energy take-off portion 24. The end of the sub-support member 261 extending to the electric energy take-off portion 24 has a curved segment. The curved segment is arranged facing the first wall 213, and the projection of the curved segment on the first wall 213 may or may not be located on the pressure release mechanism 22. The curved segment effectively increases the contact area between the electric energy take-off portion 24 and the support member 26, and can further improve the effect of blocking and position restriction of the support member 26 against the electric energy take-off portion 24.

[0131] The support member 26 may include two, three, four or more sub-support members 261. Illustratively, the support member 26 includes two sub-support members 261, which are fixed to the first wall 213 and located on opposite sides of the pressure release mechanism 22, respectively.

[0132] The support member 26 includes a plurality of sub-support members 261 disposed around the pressure release mechanism 22. The plurality of sub-support members 261 play a role in supporting the electric energy output unit 24 at a plurality of positions, and a gas discharge passage 264 communicating with the pressure release mechanism 22 is formed between two adjacent sub-support members 261, so that high-temperature, high-pressure gas can be discharged through the gas discharge passage 264 and via the pressure release mechanism 22, resulting in a simple configuration and excellent practicality.

[0133] 6 and 7, Fig. 6 is an exploded view showing a first wall, an insulating member, and a support member of a battery cell according to some other embodiments of the present application, and Fig. 7 is a cross-sectional view of the first wall and the support member according to some other embodiments of the present application. In some other embodiments of the present application, the support member 26 is covered by the pressure release mechanism 22 and has a gas exhaust passage 264 that communicates between the internal space of the support member 26 and the external space of the support member 26.

[0134] Specifically, the support member 26 has a cover-like structure, and an open surface of the cover faces the first wall 213 and is fixedly connected to the first wall 213, thereby covering the pressure release mechanism 22 so as to be located within the support member 26. The pressure release mechanism 22 may be covered entirely by the support member 26, or only a portion of the pressure release mechanism 22 may be covered by the support member 26.

[0135] The support member 26 is a mesh or porous cover structure, and the mesh in the support member 26 is formed as the above-mentioned gas discharge passage 264, and the shape of the support member 26 may be a hemisphere, a cylinder with one open end, etc. Of course, the support member 26 may include a support wall disposed opposite the pressure release mechanism 22 and a side wall connecting the support wall and the first wall 213, and the support wall is configured to abut against the deformed electric energy output portion 24, and the gas discharge passage 264 is disposed in the side wall.

[0136] The support member 26 covers the pressure release mechanism 22. The support member 26 plays a protective role like a protective cover for the pressure release mechanism 22. In this way, on the one hand, the structural strength of the support member 26 itself can be effectively ensured, and the stability of the support member 26 that receives force can be effectively ensured, and on the other hand, the support member 26 covering the pressure release mechanism 22 can sufficiently restrict the electric energy take-off part 24 from blocking the pressure release hole 221, and the support member 26 is provided with a gas discharge passage 264 that communicates the internal space of the support member 26 with the external space, so that when thermal runaway occurs in the battery cell 20, the gas in the battery cell 20 can smoothly reach the electric energy take-off part 24 through the gas discharge passage 264, and it can be ensured that pressure release proceeds smoothly in the electric energy take-off part 24.

[0137] 6 and 7, in some embodiments of the present application, the support member 26 includes a first bottom wall 262 and a first side wall 263, the first bottom wall 262 and the pressure release mechanism 22 are arranged opposite each other in the thickness direction of the first wall 213, a gap is formed between the first bottom wall 262 and the pressure release mechanism 22, the first side wall 263 is connected to each of the first bottom wall 262 and the first wall 213, and a gas discharge passage 264 is formed in the first side wall 263.

[0138] As shown in FIG. 7, the thickness direction of the first wall 213 is the first direction Z, and the first bottom wall 262 and the first wall 213 are installed at a distance from each other along the first direction Z, thereby forming a gap between the first bottom wall 262 and the pressure release mechanism 22.

[0139] The first side wall 263 is connected to the first bottom wall 262 and the first wall 213, respectively, and a gas discharge passage 264 is formed in the first side wall 263. The first side wall 263 and the first passage may have various embodiments. For example, the first side wall 263 may be an incompletely closed annular structure, the first side wall 263 may be disposed around the pressure release mechanism 22 and surrounding the first bottom wall 262, and an opening in the first side wall 263 may be formed as the gas discharge passage 264.

[0140] For example, the first side wall 263 may be a completely closed annular structure, and one or more through holes may be provided in the wall portion of the first side wall 263, and the through holes may be formed as the gas exhaust passage 264.

[0141] Of course, the first side wall 263 may include multiple sub-side walls, which are spaced apart around the pressure release mechanism 22, and a gas discharge passage 264 is formed between two adjacent sub-side walls.

[0142] For example, as shown in FIG. 6 , the first side wall 263 includes a first sub-side wall 2631 and a second sub-side wall 2632, the first sub-side wall 2631 is an arc-shaped wall whose axial direction is the first direction Z, the second sub-side wall 2632 is installed at an angle relative to the first bottom wall 262, the first sub-side wall 2631 and the second sub-side wall 2632 are installed with a gap between them and are located on opposite sides of the first bottom wall 262, and a gas discharge passage 264 is formed between the first sub-side wall 2631 and the second sub-side wall 2632.

[0143] By arranging the first bottom wall and the first wall 213 opposite each other, a gap is formed between the first bottom wall 262 and the pressure release mechanism 22, and the first bottom wall 262 is configured to extend toward the electric energy take-off portion 24, thereby restricting the approach of the electric energy take-off portion 24 to the pressure release mechanism 22, thereby restricting the pressure release hole 221 from being blocked by the electric energy take-off portion 24. In addition, by forming the gas discharge passage 264 in the first side wall 263, the risk of the gas discharge passage 264 being blocked by the electric energy take-off portion 24 can be effectively reduced, and smooth pressure release by the pressure release mechanism 22 can be effectively ensured.

[0144] 3 and 8 to 11, Fig. 8 is a schematic diagram of an adapter provided with a reinforcing portion according to some embodiments of the present application, Fig. 9 is a schematic diagram showing a first bent portion in an adapter according to some embodiments of the present application in an unfolded state, Fig. 10 is a schematic diagram showing a first bent portion in an adapter according to some embodiments of the present application in a folded-back state, and Fig. 11 is a partial cross-sectional view of a battery cell according to some embodiments of the present application. In some embodiments of the present application, the battery cell 20 further includes an electrode lead portion 23 disposed on the first wall 213. The electrical energy extraction portion 24 includes an adapter 242 and a tab 241, the tab 241 is connected to the electrode assembly 25, the adapter 242 is installed between the first wall 213 and the electrode assembly 25, the tab 241 and the electrode lead-out portion 23 are electrically connected via the adapter 242, and the support member 26 is configured to limit the pressure release hole 221 formed in the pressure release mechanism 22 from being blocked by the adapter 242 during thermal runaway of the battery cell 20.

[0145] As described above, the electrode lead portion 23 is a component that extracts electrical energy from the battery cell 20, and is configured to be electrically connected to an adjacent battery cell 20 or other conductive components. There are various embodiments of the electrode lead portion 23. Exemplarily, the electrode lead portion 23 may be an electrode terminal installed in the housing 21, and may have a sheet-like structure, a columnar structure, or the like. Exemplarily, the electrode lead portion 23 is an electrode terminal.

[0146] The tab 241 may be connected to the electrode assembly 25 by welding, bonding with a conductive adhesive, or the like, or the tab 241 may be integral with the electrode assembly 25. For example, a portion of the electrode plate on which an active material layer is not applied is formed as the tab 241.

[0147] The adapter 242 serves to pass and collect current, and is configured to electrically connect the tab 241 and the electrode lead portion 23 .

[0148] There are various embodiments of the adaptor 242. For example, the adaptor 242 has a sheet shape, a thickness direction of the adaptor 242 is the thickness direction of the first wall 213 (first direction Z shown in the drawings), the adaptor 242 has a first connection surface and a second connection surface that are installed opposite to each other in the thickness direction, the first connection surface faces the tab 241 and is welded to the tab 241, and the second connection surface faces the first wall 213 and is electrically connected to the electrode lead portion 23.

[0149] The electric energy take-off portion includes an adapter 242 and a tab 241, and the tab 241 may be integrally formed with the electrode assembly 25 or may be connected by a method such as welding, and the adapter 242 is configured to connect the tab 241 to the electrode lead-out portion 23. When thermal runaway occurs in the battery cell 20, the tab 241 connected to the electrode assembly 25 is likely to be deformed by the impact force of the high-temperature, high-pressure gas, which causes the adapter 242 to deform so as to approach the pressure release mechanism 22 in the first wall 213, and the deformed adapter 242 blocks the pressure release hole 221 of the pressure release mechanism 22. In this case, the airflow is obstructed by the pressure release mechanism 22 and cannot be discharged from the battery cell 20 in a timely manner. The support member 26 can limit the pressure release hole 221 formed in the pressure release mechanism 22 from being blocked by the adapter 242 when the battery cell 20 experiences thermal runaway, thereby preventing the problem of the pressure release hole 221 formed in the pressure release mechanism 22 being blocked by the deformed adapter 242 when the battery cell 20 experiences thermal runaway, effectively ensuring smooth and timely gas release when the battery cell 20 experiences thermal runaway, reducing the risk of the battery cell 20 exploding, and effectively improving the safety performance of the battery cell 20.

[0150] In some embodiments of the present application, as shown in Figures 8 and 11, the adapter 242 has a reinforcing portion 243, and in the thickness direction of the first wall 213, a projection of the reinforcing portion 243 on the first wall 213 at least partially overlaps with a projection of the support member 26 on the first wall 213.

[0151] The thickness direction of the first wall 213 is the first direction Z, and "the projection of the reinforcing portion 243 on the first wall 213 and the projection of the support member 26 on the first wall 213 at least partially overlap" may mean that the projection of the reinforcing portion 243 on the first wall 213 and the projection of the support member 26 on the first wall 213 completely overlap or may partially overlap. The purpose of this installation is that when the adapter 242 moves toward the pressure release mechanism 22, at least a part of the structure of the reinforcing portion 243 abuts against the support member 26, and a gas discharge passage that communicates the pressure release hole with the inside of the battery cell is formed between the reinforcing portion 243 and the support member 26, and the cooperation of the reinforcing portion 243 of the adapter 242 and the support member 26 restricts and prevents the adapter 242 from approaching the pressure release mechanism 22 and blocking the pressure release hole 221 of the pressure release mechanism 22.

[0152] There are various embodiments of the reinforcing portion 243. For example, a part of the adapter 242 may be made thicker, and the thicker part of the adapter 242 may be formed as the reinforcing portion 243. Alternatively, a groove may be formed by press molding or the like on a surface of the adapter 242 that is away from the first wall 213, and a protrusion may be formed on the surface of the adapter 242 that faces the first wall 213 at a position corresponding to the groove, and the protrusion may be formed as the reinforcing portion 243.

[0153] The adapter is provided with a reinforcing portion 243, which increases the structural strength of the adapter 242, so that when thermal runaway occurs in the battery cell 20, the adapter 242 is less likely to deform, thereby reducing the risk that the adapter 242 will block the pressure release hole 221. Furthermore, the projection of the reinforcing portion 243 on the first wall 213 and the projection of the support member 26 on the first wall 213 at least partially overlap each other, so that when the battery cell 20 experiences thermal runaway and the adapter 242 approaches the first wall 213, the reinforcing portion 243 of the adapter 242 at least partially abuts against the support member 26, and the support member 26 restricts the position of the adapter 242, effectively restricting the adapter 242 from blocking the pressure release hole 221, thereby ensuring that the pressure release hole 221 can normally release pressure, and the battery cell 20 has a relatively high level of safety.

[0154] Referring to FIG. 8, in some embodiments of the present application, the adapter 242 includes a first connection portion 2421 and a second connection portion 2424, the first connection portion 2421 is connected to the tab 241, the second connection portion 2424 is electrically connected to the electrode lead portion 23, and a reinforcing portion 243 is provided on the first connection portion 2421.

[0155] As described above, the adapter 242 is a component that realizes an electrical connection between the electrode lead portion 23 and the tab 241. The first connection portion 2421 and the second connection portion 2424 are two parts that constitute the adapter 242, and are located at both opposing ends of the adapter 242, respectively. The first connection portion 2421 and the second connection portion 2424 are folded and installed in the housing 21. The adapter includes the first connection portion 2421 and the second connection portion 2424, and the first connection portion 2421 is connected to the tab 241. In order to ensure the stability of the connection between the first connection portion 2421 and the tab 241, the first connection portion 2421 is relatively large, and the projection of the first connection portion 2421 on the first wall can cover the pressure release mechanism 22, and in order to reduce weight, the second connection portion 2424 is relatively small, and the second connection portion 2424 generally cannot cover the pressure release mechanism 22. When thermal runaway occurs in the battery cell 20, the tab 241 deforms, causing the first connection portion 2421 to deform and approach the first wall 213, and the pressure release hole 221 formed in the pressure release mechanism 22 during thermal runaway of the battery cell is likely to be blocked by the deformed first connection portion 2421. In this case, by providing the reinforcing portion 243 at the first connection portion 2421, the first connection portion 2421 becomes less likely to deform, and the reinforcing portion 243 comes into contact with the support member 26, thereby limiting the pressure release hole 221 of the pressure release mechanism 22 from being blocked by the first connection portion 2421.

[0156] As shown in Figures 9 and 10, in some embodiments of the present application, the reinforcing portion 243 is a first folded portion 243a connected to an edge portion of the first connection portion 2421, and the first connection portion 2421 has a first surface 2422 facing the first wall 213 and a second surface 2423 spaced from the first wall 213, and is configured so that the first folded portion 243a is folded to the first surface 2422 side or the second surface 2423 side.

[0157] The first surface 2422 and the second surface 2423 of the first connection portion 2421 are two opposing surfaces in the thickness direction of the first connection portion 2421, which is the thickness direction of the first wall 213 (the first direction Z shown in the drawing).

[0158] The reinforcing portion 243 may be integrally formed with the first connecting portion 2421, or may be welded to the first connecting portion 2421. A crease may be provided at the connection point between the reinforcing portion 243 and the edge of the first connecting portion 2421 to facilitate folding back the reinforcing portion 243.

[0159] "The first folding portion 243a is configured to be folded to the first surface 2422 or the second surface 2423" means that the reinforcing portion 243 is folded from the edge of the first connecting portion 2421 toward the first surface 2422 to form the first folding portion 243a, or the reinforcing portion 243 is folded from the edge of the first connecting portion 2421 toward the second surface 2423 to form the first folding portion 243a.

[0160] The reinforcing portion is the first bent portion 243a, and the first bent portion 243a is bent toward the third surface 271, or the first bent portion 243a is bent toward the first surface 2422, which contributes to the processing and shaping of the adapter 242 and the reinforcing portion 243 and ensures that the strength of the reinforcing portion 243 of the first connection portion 2421 is greater than the strength of other portions of the first connection portion 2421.

[0161] As shown in FIG. 11 , in some embodiments of the present application, the first connection portion 2421 has a first surface 2422 facing the first wall 213 and a second surface 2423 spaced from the first wall 213, and a protrusion 243b is formed on the first surface 2422 or the second surface 2423, and the protrusion 243b is a reinforcing portion 243.

[0162] As described above, the first surface 2422 and the second surface 2423 of the first connection portion 2421 are two opposing surfaces in the thickness direction of the first connection portion 2421, which is the thickness direction of the first wall 213 (the first direction Z shown in the drawing).

[0163] There are various ways to form the protrusion 243b on the first surface 2422 or the second surface 2423. For example, a member such as a block-shaped structure or a sheet-shaped structure is fixedly connected to the first surface 2422 by welding, and the member is configured as the protrusion 243b, or a local thick-walled region is formed in the adapter 242 by integral molding, and the local thick-walled region is configured as the protrusion 243b.

[0164] For example, as shown in FIG. 11 , a protrusion 243b is formed on a first surface 2422 of the adapter 242 by integral molding, and a groove is formed on a portion of the second surface 2423 of the adapter 242 corresponding to the protrusion 243b. The adapter 242 having such a structure avoids excessive increase in weight of the adapter 242 when providing the reinforcing portion 243, and is advantageous in reducing the weight of the battery cell 20.

[0165] The reinforcing portion is a protrusion 243b provided on the adapter 242, which is easy to manufacture and process, and can effectively ensure the structural strength of the reinforcing portion 243.

[0166] In some embodiments of the present application, the reinforcing portion 243 is located on the side of the first connecting portion 2421 facing the first wall 213 .

[0167] As described above, the first connection portion 2421 has the first surface 2422 facing the first wall 213 and the second surface 2423 spaced apart from the first wall 213. The reinforcing portion 243 is located on the side of the first connection portion 2421 facing the first wall 213, which means that the reinforcing portion 243 is located on the first surface 2422 side.

[0168] That is, in an embodiment in which "reinforcing portion 243 is first folded portion 243a connected to an edge portion of first connecting portion 2421", reinforcing portion 243 is folded from the edge portion of first connecting portion 2421 to first surface 2422 to form first folded portion 243a. In an embodiment in which "protrusion 243b is formed on first surface 2422 or second surface 2423, and protrusion 243b is reinforcing portion 243", protrusion 243b is formed on first surface 2422, and protrusion 243b is reinforcing portion 243.

[0169] The reinforcing portion is located on the side of the first connection portion 2421 facing the first wall 213, thereby preventing the reinforcing portion 243 from interfering with the connection between the adapter 242 and the tab 241 by being provided in the area where the first connection portion 2421 and the tab 241 are connected.

[0170] 4 to 6, 12 and 13, FIG. 12 is a cross-sectional view showing a fitting manner between an insulating member and a support member according to some embodiments of the present application, and FIG. 13 is a cross-sectional view showing a fitting manner between an insulating member and a support member according to some other embodiments of the present application. In some embodiments of the present application, the battery cell 20 further includes an insulating member 27. At least a portion of the insulating member 27 is disposed between the first wall 213 and the electric energy output portion 24, and is configured to insulate and isolate the first wall 213 and the electric energy output portion 24. The insulating member 27 has a third surface 271 facing the first wall 213, and a groove 272 is formed in the third surface 271, and at least a portion of the support member 26 is accommodated in the groove 272.

[0171] As described above, the material of the insulating member 27 may be plastic, such as PP (polypropylene) or PE (polyethylene), which is advantageous for ensuring the insulating effect while reducing the weight of the battery cell 20.

[0172] As described above, the insulating member 27 generally has a through hole 274 at a location corresponding to the pressure release mechanism 22, and the through hole 274 allows gas inside the battery cell 20 to reach the pressure release mechanism 22 smoothly.

[0173] The recessed groove 272 is a portion that is provided in the insulating member 27 to avoid the support member 26 , and is a recessed area that is recessed in the direction away from the first wall 213 in the third surface 271 .

[0174] The installation position and installation manner of the groove 272 can correspond to the support member 26. For example, as shown in Fig. 12, based on the embodiment in which "the support member 26 is fixed to the first wall 213 and includes a plurality of sub-support members 261 installed around the pressure release mechanism 22", the groove 272 includes a plurality of sub-grooves 2721, and the sub-grooves 2721 correspond one-to-one to the sub-support members 261 along the thickness direction of the first wall 213 (first direction Z shown in the drawing), and the end of each sub-support member 261 remote from the first wall 213 is inserted into the corresponding sub-groove 2721.

[0175] In some other embodiments, as shown in FIG. 13 , based on the embodiment in which “the support member 26 includes a first bottom wall 262 and a first side wall 263, the first bottom wall 262 and the pressure release mechanism 22 are arranged opposite each other in the thickness direction of the first wall 213, a gap is formed between the first bottom wall 262 and the pressure release mechanism 22, the first side wall 263 is connected to each of the first bottom wall 262 and the first wall 213, and a gas discharge passage 264 is formed in the first side wall 263,” the groove 272 corresponds to the support member 26, the inner surface of the groove 272 corresponds to the outer surface of the support member 26, the first bottom wall 262 completely enters the groove 272, and at least a portion of the first side wall 263 enters the groove 272.

[0176] In some other embodiments, as shown in FIG. 12, the insulating member 27 further includes a fourth surface 273 facing the third surface 271 in the thickness direction of the first wall 213 (first direction Z shown in the drawings), i.e., the fourth surface 273 faces the electrode assembly 25, and a protrusion 2722 is formed on the fourth surface 273 at a location corresponding to the groove 272. According to this design, the structure of the insulating member 27 other than the groove 272 can be made thin, which can effectively reduce the space utilization rate of the insulating member 27, reduce the weight of the insulating member 27, and save the material of the insulating member 27. When the supporting member 26 is a metal member, an insulating part 2723 is installed between the supporting member 26 and the electric energy output part 24. As shown in FIG. 11 and FIG. 12, the insulating part 2723 may be integrally formed with the insulating member 27, and of course, in some other embodiments, the insulating part 2723 may be installed separately from the insulating member 27.

[0177] The support member 26 is in contact with the electric energy output portion 24 via the insulating part 2723, which can reduce vibration of the electrode assembly 25.

[0178] The insulating member 27 is configured to insulate and isolate the first wall 213 from the electric energy output portion 24, thereby preventing a short circuit due to contact between the first wall 213 and the electric energy output portion 24. The provision of the groove 272 ensures the insulating effect between the first wall 213 and the electric energy output portion 24, and prevents the internal space of the battery cell 20 from being excessively occupied by the support member 26 and the insulating member 27, thereby effectively ensuring the energy density of the battery cell 20.

[0179] 3 to 13 and 14 to 17, FIG. 14 is a schematic diagram of an adapter in an open state according to some embodiments of the present application, FIG. 15 is a perspective view showing an embodiment in which the adapter according to some embodiments of the present application is assembled to a battery cell, FIG. 16 is a schematic diagram showing an engagement between the adapter and a reinforcing member according to some embodiments of the present application, and FIG. 17 is a front cross-sectional view showing an engagement between the adapter and a reinforcing member according to some embodiments of the present application. In some embodiments of the present application, the battery cell 20 further includes an electrode lead portion 23 disposed on the first wall 213. The electric energy output portion 24 includes an adapter 242 and a tab 241, the adapter 242 is disposed between the first wall 213 and the electrode assembly 25, the tab 241 is connected to the electrode assembly 25, and the tab 241 is electrically connected to the electrode lead portion 23 via the adapter 242. The support member 26 is installed on the adapter 242 and is configured to limit the pressure release hole 221 formed in the pressure release mechanism 22 from being blocked by the adapter 242 in the event of thermal runaway of the battery cell 20 .

[0180] As described above, the electrode lead portion 23 is a component for extracting electrical energy from the battery cell 20, and is configured to be electrically connected to an adjacent battery cell 20 or other conductive components. The electrode lead portion 23 can be implemented in various forms. Exemplarily, the electrode lead portion 23 may be an electrode terminal installed in the housing 21, and may have a sheet-like structure, a columnar structure, or the like. Exemplarily, the electrode lead portion 23 is an electrode terminal.

[0181] The tab 241 may be connected to the electrode assembly 25 by welding, bonding with a conductive adhesive, or the like, or the tab 241 may be integral with the electrode assembly 25. For example, a portion of the electrode plate on which an active material layer is not applied is formed as the tab 241.

[0182] The adapter 242 serves to pass and collect current, and is configured to electrically connect the tab 241 and the electrode lead portion 23 .

[0183] There are various embodiments in which the support member 26 is installed on the adapter 242. For example, the adapter 242 includes a first connection surface facing the first wall 213, the support member 26 is a protrusion protruding from the first connection surface, and the protrusion has an incompletely closed annular structure installed around the pressure release mechanism 22. When the adapter 242 moves to the pressure release hole 221, the end of the support member 26 away from the adapter 242 abuts against the first wall 213, thereby separating the adapter 242 and the pressure release hole 221 to a certain extent in the thickness direction of the first wall 213, thereby realizing the effect of limiting the blocking of the pressure release hole 221 by the adapter 242, and the notch of the incompletely closed annular support member 26 is formed as a passage for the flow of gas, which can contribute to normal gas discharge of the pressure release mechanism 22.

[0184] The electric energy take-off portion includes an adapter 242 and a tab 241, and the tab 241 may be integrally formed with the electrode assembly 25 or may be connected by a method such as welding. When the adapter 242 connects the tab 241 to the electrode lead-out portion 23 and thermal runaway occurs in the battery cell 20, the tab 241 connected to the electrode assembly 25 is likely to deform due to the impact force of the high-temperature, high-pressure gas, which causes the adapter 242 to deform and approach the pressure release mechanism 22 in the first wall 213, and the pressure release hole 221 of the pressure release mechanism 22 is likely to be blocked by the deformed adapter 242, and the airflow is obstructed by the pressure release mechanism 22, making it impossible for the air to be discharged from the battery cell 20 in a timely manner. The support member 26 can limit the pressure release hole 221 of the pressure release mechanism 22 from being blocked by the adapter 242, thereby preventing the problem of the adapter 242 deforming and blocking the pressure release hole 221 of the pressure release mechanism 22, effectively ensuring that gas discharge proceeds smoothly and timely during thermal runaway of the battery cell 20, reducing the risk of explosion of the battery cell 20, and effectively improving the safety performance of the battery cell 20. Then, the support member 26 is installed on the adapter 242. In this way, on the one hand, the support member 26 itself increases the structural strength of the adapter 242, increasing the structural strength of the adapter 242 and making it difficult for the adapter 242 to deform during thermal runaway of the battery cell 20. On the other hand, if the support member 26 is installed on the adapter 242, the space utilization rate of the support member 26 can be effectively reduced, which is favorable for improving both the safety performance and the energy density of the battery cell 20.

[0185] Referring to Figures 3 and 4, in some embodiments of the present application, the adapter 242 includes a first connection portion 2421 and a second connection portion 2424, the first connection portion 2421 is connected to the tab 241, the second connection portion 2424 is connected to the electrode lead portion 23, and the support member 26 is installed on the first connection portion 2421.

[0186] The first connection portion 2421 and the second connection portion 2424 are two portions that constitute the adapter 242, and are located at opposite ends of the adapter 242. The first connection portion 2421 and the second connection portion 2424 are installed in the housing 21 so as to be folded.

[0187] The adapter 242 includes a first connection part 2421 and a second connection part 2424, and the first connection part 2421 is connected to the tab 241. In order to ensure the stability of the connection between the first connection part 2421 and the tab 241, the first connection part 2421 is configured to be relatively large, so that the projection of the first connection part 2421 on the first wall can cover the pressure release mechanism 22, and in order to reduce weight, the second connection part 2424 is configured to be relatively small, so that the second connection part 2424 generally cannot cover the pressure release mechanism 22. When thermal runaway occurs in the battery cell 20, if the tab 241 is deformed, the first connection part 2421 is deformed and approaches the first wall 213, and the pressure release hole 221 formed in the pressure release mechanism 22 is likely to be blocked by the deformed first connection part 2421 during thermal runaway of the battery cell. In this case, by installing the support member 26 on the first connection part 2421, the first connection part 2421 becomes less likely to deform, and after the first connection part 2421 deforms, the support member 26 can directly restrict the first connection part 2421 from blocking the pressure release hole 221.

[0188] As shown in Figures 14 and 15, in some embodiments of the present application, the first connection portion 2421 has a first surface 2422 facing the first wall 213 and a second surface 2423 spaced from the first wall 213, and the support member 26 has a recess 265 formed in the first surface 2422 and a protrusion 266 formed in the second surface 2423 at a location corresponding to the recess 265, and in the thickness direction of the first wall 213, the projection of the recess 265 on the first wall 213 can cover at least a portion of the pressure release mechanism 22.

[0189] When the first surface 2422 of the first connection portion faces the first wall 213, a recess 265 is formed in the first surface 2422, the open surface of the recess 265 faces the first wall 213, and the first connection portion 2421 approaches the first wall 213, the structural strength of the support member 26 is relatively high and the support member 26 is less likely to deform than other portions of the first connection portion 2421.

[0190] The projection of the recess 265 on the first wall 213 can cover at least a part of the pressure release mechanism 22, which means that the projection of the recess 265 on the first wall 213 can cover the entire pressure release mechanism 22 or can cover a part of the pressure release mechanism 22. In this way, when thermal runaway occurs in the battery cell, a pressure release hole 221 is formed in the pressure release mechanism, the first connection portion 2421 approaches the first wall 213, the recess 265 of the support member 26 can cover the pressure release mechanism 22 or at least a part of the pressure release mechanism 22, a space that allows gas to pass between the recess 265 and the pressure release mechanism 22 can be secured, and the pressure release hole 221 can be effectively prevented from being blocked by the first connection portion 2421.

[0191] There are various embodiments of the recess 265 of the support member 26. For example, the recess 265 is provided so as to extend to the edge of the first connection portion 2421, whereby gas in the battery cell 20 can enter the recess 265 via the edge of the first connection portion 2421 and be discharged via the pressure release mechanism 22 covered by the recess 265. Alternatively, a passage is provided in the side wall of the recess 265 to communicate the internal space of the recess 265 with the external space of the recess 265, whereby gas in the battery cell 20 can enter the recess 265 via the passage and be discharged via the pressure release mechanism 22.

[0192] The support member 26 may be integrally molded with the first connecting portion 2421 by press molding, or may be installed separately from the first connecting portion 2421 and connected to the first connecting portion 2421 by welding or the like. For example, the support member 26 is integrally molded with the first connecting portion 2421.

[0193] The support member 26 is installed on the first connection portion 2421, a recess 265 is formed on the first surface 2422, and a protrusion 266 is formed on the second surface 2423, and the projection of the recess 265 on the first wall 213 can cover at least a part of the pressure release mechanism 22. The support member 26 having such a structure can effectively increase the structural strength of the first connection portion 2421 and suppress deformation of the first connection portion 2421, and after the first connection portion 2421 deforms to the first wall 213, the recess 265 in the first connection portion 2421 can ensure a certain degree of gap between the pressure release mechanism 22 and the first connection portion 2421, thereby preventing the pressure release hole 221 from being blocked by the first connection portion 2421 and allowing the pressure release mechanism 22 to smoothly release pressure.

[0194] As shown in FIG. 14, in some embodiments of the present application, the recess 265 extends to the edge of the first connecting portion 2421 .

[0195] The recess 265 extends to the edge of the first connection portion 2421, thereby directly connecting the space of the recess 265 to the space outside the edge of the first connection portion 2421. When thermal runaway occurs in the battery cell 20, gas can enter the recess 265 directly from the edge of the first connection portion 2421 and reach the pressure release mechanism 22, effectively ensuring the smooth flow of gas.

[0196] As shown in FIG. 16 , in some embodiments of the present application, the battery cell 20 further includes a reinforcing member 28 , at least a portion of the reinforcing member 28 being disposed within the recess 265 .

[0197] The reinforcing member 28 plays a role in supporting and reinforcing the structure of the supporting member 26. By disposing a part of the reinforcing member 28 in the recess 265, it is advantageous to improve the structural strength and stability of the recess 265 after the first connecting portion 2421 is deformed.

[0198] There are various embodiments of the reinforcing member 28. The reinforcing member 28 may be a reinforcing wall that is in close contact with the bottom wall of the recess 265, or may be an arc-shaped wall that is fitted into the recess 265, with both ends of the arc-shaped wall abutting against two inner walls of the recess 265, respectively, and with the outer circumferential surface of the arc-shaped wall abutting against the bottom wall of the recess 265.

[0199] At least a portion of the reinforcing member is disposed within the recess 265, which can increase the structural strength of the support member 26 and further improve the structural stability of the recess 265 when subjected to force.

[0200] In some embodiments of the present application, as shown in Figures 16 and 17, the reinforcing member 28 includes a second bottom wall 281 and a second side wall 282, the second bottom wall 281 being in close contact with the bottom surface of the recess 265, and the second side wall 282 being formed on the edge of the second bottom wall 281 and in close contact with the side surface of the recess 265.

[0201] The second bottom wall 281 and the second side wall 282 are two components of the reinforcing member 28. The second side wall 282 is formed on the edge of the second bottom wall 281, and the second side wall 282 and the second bottom wall 281 are integrally formed.

[0202] The second bottom wall 281 is in close contact with the bottom surface of the recess 265, so that the contact area between the second bottom wall 281 and the bottom surface of the recess 265 is relatively large, and the second bottom wall 281 has a relatively excellent effect of reinforcing and restricting the position of the bottom surface of the recess 265. The second bottom wall 281 may be welded to the bottom surface of the recess 265, so that the connection strength between the second bottom wall 281 and the bottom surface of the recess 265 is relatively good.

[0203] The second side wall 282 is in close contact with the side surface of the recess 265, so that the contact area between the second side wall 282 and the side surface of the recess 265 is relatively large, and the effect of reinforcing and restricting the position of the side surface of the recess 265 by the second side wall 282 is relatively excellent. The second side wall 282 may be welded to the side surface of the recess 265, so that the connection strength between the second side wall 282 and the side surface of the recess 265 is relatively good.

[0204] The second bottom wall 281 of the reinforcing member 28 is in close contact with the bottom surface of the recess 265, and the second side wall 282 of the reinforcing member 28 is in close contact with the side surface of the recess 265. As a result, the support effect provided by the reinforcing member 28, which conforms to the shape of the recess 265, is relatively excellent, which effectively improves the structural strength of the entire supporting member 26 and effectively improves the stability of the supporting member 26 when subjected to force.

[0205] 16 and 17, in some embodiments of the present application, the reinforcing member 28 further includes a second folded portion 283, which is connected to the second side wall 282, and which is located outside the recess 265 and in close contact with the first surface 2422.

[0206] The second bent portion 283 is located outside the recess 265 and is in close contact with the first surface 2422, which provides a relatively stable connection between the reinforcing member 28 and the first connecting portion 2421. To ensure good connection strength between the second bent portion 283 and the first connecting portion 2421, the second bent portion 283 may be welded to the first surface 2422.

[0207] Providing second bent portion 283 improves the stability of connection of reinforcing member 28 with first connection portion 2421 and its stability when subjected to force, and can also serve to support and reinforce first connection portion 2421. When thermal runaway occurs in battery cell 20, reinforcing member 28 makes it more difficult for first connection portion 2421 to deform, thereby improving the stability of first connection portion 2421 as a whole when subjected to force.

[0208] As shown in FIG. 15, in some embodiments of the present application, the first connecting portion 2421 includes a main body region 242a and a connecting region 242b, the connecting region 242b is connected with the tab 241, and a protrusion 266 is formed on the main body region 242a.

[0209] The main body region 242a and the connection region 242b are two regions that configure the first connecting portion 2421. The connection region 242b is a region for direct connection with the tab 241. To ensure the stability of the connection between the first connecting portion 2421 and the tab 241, the connection region 242b may be welded to the tab 241. The connection region 242b is connected to the tab 241, and a protrusion 266 is formed in the main body region 242a, so that the connection area between the first connecting portion 2421 and the tab 241 can be prevented from being affected by the protrusion 266.

[0210] In some embodiments of the present application, the connection region 242b protrudes relative to the second surface 2423, and the height of the portion of the convex portion 266 that protrudes relative to the second surface 2423 is less than the height of the portion of the connection region 242b that protrudes relative to the second surface 2423.

[0211] The height of the portion of the convex portion 266 that protrudes from the second surface 2423 is equal to or less than the height of the portion of the connection region 242b that protrudes from the second surface 2423, and the space that the convex portion 266 occupies in the thickness direction (first direction Z) is relatively small, thereby preventing any effect on the connection between the connection region 242b and the tab 241, while ensuring the strength of the support member 26.

[0212] In some embodiments of the present application, the present application further provides a battery 100. The battery 100 includes a battery cell 20 according to any one of the above schemes.

[0213] In some embodiments of the present application, the present application further provides an electric device, comprising a battery 100 according to the above proposal, said battery 100 for providing electric energy.

[0214] The electrical device can be any one of the appliances or systems that uses the battery 100 .

[0215] 3 to 5 and 8 to 12, some embodiments of the present application provide a battery cell 20. The battery cell 20 includes a housing 21, an electrode assembly 25, an electrode lead portion 23, an electric energy output portion 24, a pressure release mechanism 22, a support member 26, and an insulating member 27. The housing 21 includes a first wall 213, and the pressure release mechanism 22 and the electrode lead portion 23 are both installed on the first wall 213. The electrode assembly 25 and the electric energy output portion 24 are both installed in the housing 21. The electric energy output portion 24 includes a tab 241 and an adapter 242, and the tab 241 is connected to the electrode assembly 25. The adapter 242 includes a first connection portion 2421 and a second connection portion 2424, and the first connection portion 2421 is connected to the tab 241, and the second connection portion 2424 is electrically connected to the electrode lead portion 23.

[0216] The support member 26 is fixed to the first wall 213 and includes two sub-support members 261 , one on each side of the pressure release mechanism 22 .

[0217] The insulating member 27 is disposed between the first wall 213 and the adapter 242, and is configured to insulate and isolate the first wall 213 from the electric energy extraction unit 24. The insulating member 27 includes a third surface 271 facing the first wall 213, and a recessed groove 272 is formed in the third surface 271, and the ends of the two sub-support members 261 facing the adapter 242 are accommodated in the recessed groove 272.

[0218] A reinforcing portion 243 is provided at the first connection portion 2421, and in the thickness direction of the first wall 213, a projection of the reinforcing portion 243 on the first wall 213 and a projection of the support member 26 on the first wall 213 at least partially overlap with each other.

[0219] The reinforcing portion 243 is a first folded portion 243a connected to an edge portion of the first connecting portion 2421, and the first connecting portion 2421 has a first surface 2422 facing the first wall 213 and a second surface 2423 spaced from the first wall 213, and is configured so that the first folded portion 243a is folded toward the first surface 2422.

[0220] 3 to 5 and 8 to 12, some embodiments of the present application provide a battery cell 20. The battery cell 20 includes a housing 21, an electrode assembly 25, an electrode lead portion 23, an electric energy output portion 24, a pressure release mechanism 22, a support member 26, and an insulating member 27. The housing 21 includes a first wall 213, and the pressure release mechanism 22 and the electrode lead portion 23 are both installed on the first wall 213. The electrode assembly 25 and the electric energy output portion 24 are both installed in the housing 21. The electric energy output portion 24 includes a tab 241 and an adapter 242, and the tab 241 is connected to the electrode assembly 25. The adapter 242 includes a first connection portion 2421 and a second connection portion 2424, and the first connection portion 2421 is connected to the tab 241, and the second connection portion 2424 is electrically connected to the electrode lead portion 23.

[0221] The support member 26 is fixed to the first wall 213 and includes two sub-support members 261 , one on each side of the pressure release mechanism 22 .

[0222] The insulating member 27 is disposed between the first wall 213 and the adapter 242, and is configured to insulate and isolate the first wall 213 from the electric energy extraction unit 24. The insulating member 27 includes a third surface 271 facing the first wall 213, and a recessed groove 272 is formed in the third surface 271, and the ends of the two sub-support members 261 facing the adapter 242 are accommodated in the recessed groove 272.

[0223] A reinforcing portion 243 is provided at the first connection portion 2421, and in the thickness direction of the first wall 213, a projection of the reinforcing portion 243 on the first wall 213 and a projection of the support member 26 on the first wall 213 at least partially overlap with each other.

[0224] The first connection portion 2421 has a first surface 2422 facing the first wall 213 and a second surface 2423 spaced from the first wall 213, and a protrusion 243b is formed on the first surface 2422 or the second surface 2423, and the protrusion 243b is a reinforcing portion 243.

[0225] 3, 6, 7 and 13, some embodiments of the present application provide a battery cell 20. The battery cell 20 includes a housing 21, an electrode assembly 25, an electrode lead portion 23, an electric energy output portion 24, a pressure release mechanism 22, a support member 26, and an insulating member 27. The housing 21 includes a first wall 213, and the pressure release mechanism 22 and the electrode lead portion 23 are both installed on the first wall 213. The electrode assembly 25 and the electric energy output portion 24 are both installed in the housing 21. The electric energy output portion 24 includes a tab 241 and an adapter 242, and the tab 241 is connected to the electrode assembly 25, and the adapter 242 includes a first connection portion 2421 and a second connection portion 2424, and the first connection portion 2421 is connected to the tab 241, and the second connection portion 2424 is electrically connected to the electrode lead portion 23.

[0226] The support member 26 is fixed to the first wall 213 and is covered by the pressure release mechanism 22, the support member 26 includes a first bottom wall 262 and a first side wall 263, the first bottom wall 262 and the pressure release mechanism 22 are arranged opposite each other in the thickness direction of the first wall 213, a gap is formed between the first bottom wall 262 and the pressure release mechanism 22, the first side wall 263 is connected to each of the first bottom wall 262 and the first wall 213, and the first side wall 263 has a gas discharge passage 264.

[0227] The insulating member 27 is disposed between the first wall 213 and the adapter 242, and is configured to insulate and isolate the first wall 213 from the electric energy extraction unit 24. The insulating member 27 includes a third surface 271 facing the first wall 213, and a recessed groove 272 is formed in the third surface 271, and the ends of the first bottom wall 262 and the first side wall 263 facing the adapter 242 are accommodated in the recessed groove 272.

[0228] 3 and 14 to 17, some embodiments of the present application provide a battery cell 20. The battery cell 20 includes a housing 21, an electrode assembly 25, an electrode lead portion 23, an electric energy output portion 24, a pressure release mechanism 22, an insulating member 27, a support member 26, and a reinforcing member 28. The housing 21 includes a first wall 213, and the pressure release mechanism 22 and the electrode lead portion 23 are both installed on the first wall 213. The electrode assembly 25 and the electric energy output portion 24 are both installed in the housing 21. The electric energy output portion 24 includes a tab 241 and an adapter 242, and the tab 241 is connected to the electrode assembly 25. The adapter 242 includes a first connection portion 2421 and a second connection portion 2424, and the first connection portion 2421 is connected to the tab 241, and the second connection portion 2424 is connected to the electrode lead portion 23.

[0229] The insulating member 27 is disposed between the first wall 213 and the adapter 242 and is configured to insulate the first wall 213 from the electrical energy extraction unit 24 .

[0230] The support member 26 is installed on the first connecting portion 2421. The first connecting portion 2421 has a first surface 2422 facing the first wall 213 and a second surface 2423 spaced apart from the first wall 213. The support member 26 has a recess 265 formed on the first surface 2422 and a protrusion 266 formed on the second surface 2423 at a position corresponding to the recess 265. In the thickness direction of the first wall 213, a projection of the recess 265 on the first wall 213 can cover the pressure release mechanism 22, and the recess 265 extends to an edge of the first connecting portion 2421.

[0231] The reinforcing member 28 includes a second bent portion 283, a second bottom wall 281, and a second side wall 282, the second bottom wall 281 being in close contact with the bottom surface of the recess 265, and the second side wall 282 being formed on the edge of the second bottom wall 281 and in close contact with the side surface of the recess 265. The second bent portion 283 is connected to the second side wall 282, is located outside the recess 265, and is in close contact with the first surface 2422.

[0232] Unless there is a contradiction, the features in the embodiments of the present application can be combined with each other. Although the present application has been described using preferred embodiments, various modifications and equivalent replacements of parts may be made without departing from the scope of the present application. In particular, the technical features in each embodiment may be combined in any manner unless there is a structural contradiction. The present application is not limited to the specific embodiments disclosed in the specification, but includes all technical solutions falling within the scope of the claims. [Explanation of symbols]

[0233] 1000 vehicles 100 batteries 10. Chassis 11 Part 1 12 Part 2 20 Battery Cells 21 Housing 211 Housing body 212 Lid 213 1st wall 22 Pressure release mechanism 221 Pressure relief hole 23 Electrode lead 24 Electrical energy extraction section 241 tabs 242 Adapter 2421 First connection part 242a Subject area 242b Connection area 2422 1st surface 2423 2nd surface 2424 Second connection part 243 Reinforcement 243a First bending part 243b Protrusion 25 Electrode Assembly 26 Support member 261 Sub-support member 262 1st Bottom Wall 263 First Side Wall 2631 1st sub-side wall 2632 Second sub-side wall 264 Gas exhaust passage 265 Recess 266 Convex 27 Insulating materials 271 Third surface 272 Groove 2721 Sub-groove 2722 Protrusion 2723 Insulation parts 273 4th surface 274 Through hole 28 Reinforcement members 281 Second Bottom Wall 282 Second Side Wall 283 Second bending part 200 Control device 300 Engine

Claims

1. A battery cell, The device includes a housing, an electrode assembly, an electrical energy output, a pressure release mechanism, and a support member; the housing includes a first wall; the electrode assembly is disposed within the housing; the electrical energy takeoff is disposed within the housing and connected to the electrode assembly; the pressure release mechanism is mounted to the first wall; The support member is installed in the housing and configured to limit a pressure release hole formed in the pressure release mechanism from being blocked by the electrical energy extraction unit when the battery cell experiences thermal runaway. Battery cell.

2. The melting point of the support member is greater than 200° C. The battery cell according to claim 1 .

3. The support member is a metal member. The battery cell according to claim 1 or 2.

4. Further comprising an insulating member; At least a portion of the insulating member is disposed between the first wall and the electrical energy extraction portion, and is configured to insulate and isolate the first wall and the electrical energy extraction portion; a melting point of the support member is higher than a melting point of the insulating member, and the support member is configured to limit a pressure release hole formed in the pressure release mechanism from being blocked by the electrical energy extraction section when a thermal runaway occurs in the battery cell after the insulating member melts; The battery cell according to any one of claims 1 to 3.

5. The support member is fixed to the first wall. The battery cell according to any one of claims 1 to 4.

6. The support member is integrally formed with the first wall. The battery cell according to claim 5 .

7. The support member is disposed about the pressure release mechanism. The battery cell according to any one of claims 1 to 6.

8. the support member includes a plurality of sub-support members disposed about the pressure release mechanism; The battery cell according to claim 7.

9. the support member is covered by the pressure release mechanism and has a gas exhaust passage that communicates an internal space of the support member with an external space of the support member. The battery cell according to any one of claims 1 to 8.

10. the support member includes a first bottom wall and a first side wall, the first bottom wall and the pressure release mechanism are disposed opposite to each other in a thickness direction of the first wall, a gap is formed between the first bottom wall and the pressure release mechanism, the first side wall is connected to each of the first bottom wall and the first wall, and the gas discharge passage is formed in the first side wall; The battery cell of claim 9 .

11. The electrode lead portion is further provided on the first wall. the electrical energy extraction portion includes an adapter and a tab, the tab is connected to the electrode assembly, the adapter is installed between the first wall and the tab, the tab and the electrode lead portion are electrically connected via the adapter, and the support member is configured to limit blocking of a pressure release hole formed in the pressure release mechanism by the adapter during thermal runaway of the battery cell. The battery cell according to any one of claims 1 to 10.

12. The adapter includes a reinforcing portion, and a projection of the reinforcing portion on the first wall and a projection of the support member on the first wall at least partially overlap in a thickness direction of the first wall. The battery cell of claim 11.

13. the adapter includes a first connection portion and a second connection portion, the first connection portion is connected to the tab, the second connection portion is electrically connected to the electrode lead portion, and the reinforcing portion is installed on the first connection portion; The battery cell of claim 12.

14. the reinforcing portion is a first folded portion connected to an edge portion of the first connection portion, the first connection portion having a first surface facing the first wall and a second surface spaced apart from the first wall, and the first folded portion is configured to be folded to the first surface side or the second surface side. The battery cell of claim 13.

15. the first connection portion has a first surface facing the first wall and a second surface spaced from the first wall, a protrusion is formed on the first surface or the second surface, and the protrusion is the reinforcing portion; The battery cell of claim 13.

16. The reinforcing portion is located on a side of the first connection portion facing the first wall. The battery cell according to any one of claims 13 to 15.

17. The electrical energy extraction unit may further include an insulating member, at least a portion of which is disposed between the first wall and the electrical energy extraction unit and configured to insulate the first wall and the electrical energy extraction unit; the insulating member includes a third surface facing the first wall, the third surface having a groove formed therein, and at least a portion of the support member is received within the groove; The battery cell according to any one of claims 1 to 16.

18. The electrode lead portion is further provided on the first wall. the electrical energy extraction portion includes an adapter and a tab, the tab is connected to the electrode assembly, the adapter is installed between the first wall and the tab, and the tab and the electrode lead portion are electrically connected via the adapter; The support member is installed in the adapter and configured to limit a pressure release hole formed in the pressure release mechanism from being blocked by the adapter during thermal runaway of the battery cell. The battery cell according to any one of claims 1 to 4.

19. the adapter includes a first connection portion and a second connection portion, the first connection portion is connected to the tab, the second connection portion is connected to the electrode lead portion, and the support member is installed on the first connection portion; 20. The battery cell of claim 18.

20. the first connection portion has a first surface facing the first wall and a second surface spaced from the first wall, the support member has a recess formed on the first surface and a protrusion formed on the second surface at a location corresponding to the recess, and a projection of the recess on the first wall in a thickness direction of the first wall can cover at least a portion of the pressure release mechanism.

20. The battery cell of claim 19.

21. The recess extends to an edge of the first connection portion.

21. The battery cell of claim 20.

22. Further comprising a reinforcing member, at least a portion of the reinforcing member being disposed within the recess.

22. The battery cell according to claim 20 or 21.

23. the reinforcing member includes a second bottom wall and a second side wall, the second bottom wall is in close contact with a bottom surface of the recess, the second side wall is formed on an edge portion of the second bottom wall, and the second side wall is in close contact with a side surface of the recess; 23. The battery cell of claim 22.

24. the reinforcing member further includes a second bent portion, the second bent portion is connected to the second side wall, the second bent portion is located outside the recess and is in close contact with the first surface; 24. The battery cell of claim 23.

25. the first connection portion includes a main region and a connection region, the connection region is connected to the tab, the protrusion is formed on the main region, the connection region protrudes from the second surface, and a height of a portion of the protrusion protruding from the second surface is equal to or less than a height of a portion of the connection region protruding from the second surface; The battery cell according to any one of claims 20 to 24.

26. A battery cell according to any one of claims 1 to 25, wherein the battery cell is accommodated in the battery cell housing. battery.

27. A battery cell according to any one of claims 1 to 25, the battery cell being for providing electrical energy. Electrical equipment.

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