Battery cells, batteries, and electrical equipment

Abstract

The embodiments of the present application provide a battery cell, a battery, and an electric device. The battery cell includes a housing having a first wall, a pressure relief mechanism provided on the first wall, an electrode lead-out portion provided on the housing, an electrode unit provided in the housing and having a tab, and an adapter connecting the electrode lead-out portion and the tab, the adapter being provided with a reinforcing portion, and a projection of the reinforcing portion onto the first wall in the thickness direction of the first wall covers at least a part of the pressure relief mechanism. This battery cell has high safety.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to battery cells, batteries, and electrical devices.

Background Art

[0002] Energy conservation and emission reduction are the key points for the sustainable development of the automotive industry. Electric vehicles have the advantages of energy conservation and environmental protection, and thus become an important part of the sustainable development of the automotive industry. Also, for electric vehicles, battery technology is an important factor related to their development.

[0003] In the development of battery technology, not only the energy density of the battery needs to be improved, but safety cannot be ignored. Therefore, how to improve the safety of the battery has become an urgent technical problem to be solved in battery technology.

Summary of the Invention

[0004] This application aims to provide a battery cell, a battery, and an electrical device. This battery cell has high safety.

[0005] This application is realized by the following technical solutions.

[0006] In a first aspect, this application provides a battery cell. The battery cell includes a housing having a first wall, a pressure relief mechanism provided on the first wall, an electrode lead-out portion provided on the housing, an electrode unit provided in the housing and having tabs, and an adapter connecting the electrode lead-out portion and the tabs. A reinforcing portion is provided on the adapter, and a projection of the reinforcing portion on the first wall in the thickness direction of the first wall covers at least a part of the pressure relief mechanism.

[0007] According to the embodiment of the present application, the adapter is provided with a reinforcing portion to improve the strength of the adapter. Since the projection of the reinforcing portion onto the first wall covers at least a part of the pressure relief mechanism, the adapter is less likely to deform if thermal runaway occurs in the battery cell, reducing the risk of the adapter blocking the relief holes of the battery cell, ensuring pressure release in the battery cell, and giving the battery cell a high level of safety.

[0008] In some embodiments of this application, the adapter includes a tab connection portion that connects to the tab, and the reinforcing portion is provided on the tab connection portion.

[0009] In the above embodiment, the reinforcement portion is provided at the tab connection portion, thereby improving the strength of the tab connection portion and reducing the risk of deformation of the tab connection portion.

[0010] In some embodiments of this application, the reinforcing portion is a first bent portion of the tab connection portion, the tab connection portion having a first surface facing the first wall and a second surface away from the first wall, and the first bent portion is bent to one side of the first surface or to one side of the second surface.

[0011] In the above embodiment, the reinforcing portion is a first bent portion, and the molding process is facilitated by bending the first bent portion toward the first surface side or the second surface side.

[0012] In some embodiments of this application, the first bent portion is applied to the first surface or the second surface.

[0013] In the above embodiment, the first bent portion is positioned against the first or second surface, thereby reducing the risk of the first bent portion lifting up and making the reinforcing portion less susceptible to deformation.

[0014] In some embodiments of this application, the tab connection portion has a first surface facing the first wall and a second surface away from the first wall, and a projection is formed on the first surface, the projection being the reinforcing portion.

[0015] In some embodiments of this application, grooves are formed on the second surface at positions corresponding to the protrusions.

[0016] In the above embodiment, forming grooves corresponding to protrusions on either the first or second surface facilitates the molding process of the reinforcing portion and reduces the weight of the adapter.

[0017] In some embodiments of this application, the tab connection portion has a first surface facing the first wall and a second surface away from the first wall, and the reinforcing portion has a projection formed on the second surface and a groove formed on the first surface at a position corresponding to the projection.

[0018] In the above embodiment, the reinforcing portion has protrusions formed on the second surface and grooves formed on the first surface, thereby improving the strength of the adapter and making it less likely for the adapter to deform toward the first wall.

[0019] In some embodiments of this application, the projection of the groove onto the first wall covers at least a portion of the pressure relief mechanism.

[0020] In the above embodiment, the projection of the groove onto the first wall covers at least a part of the pressure relief mechanism, making it less likely for the reinforcing part to deform and obstruct or block the relief hole, thereby ensuring pressure release for the battery cell.

[0021] In some embodiments of this application, the groove extends to the edge of the adapter.

[0022] In the above embodiment, the groove extends to the edge of the adapter, forming a passage for gas to flow at the location of the reinforcement portion. The gas flows through the reinforcement portion towards the pressure relief mechanism, facilitating pressure release by the pressure relief mechanism.

[0023] In some embodiments of this application, a first exhaust passage is provided in the groove wall of the groove, which connects the inside and outside of the groove.

[0024] In the above aspect, a first exhaust passage that communicates the inside and the outside of the groove is provided in the groove wall of the groove, so that gas can easily enter the groove and flow toward the pressure relief mechanism, ensuring that the gas flows smoothly and facilitating the pressure relief by the pressure relief mechanism.

[0025] In some embodiments of the present application, in the thickness direction, when the distance between the bottom surface of the groove and the first wall is C1 and the distance between the first surface and the first wall is C2, 0.5 mm ≤ C1 - C2 ≤ 5 mm is satisfied.

[0026] In the above aspect, when the distance C1 between the bottom surface of the groove and the first wall and the distance C2 between the first surface and the first wall satisfy the above relationship, it is ensured that gas flows toward the pressure relief mechanism, and it is difficult for the relief hole to be blocked even if the reinforcing part is deformed. Also, it is ensured that the reinforcing part does not occupy too much of the mounting space, and it is ensured that the battery cell has a high energy density.

[0027] In some embodiments of the present application, 1 mm ≤ C1 - C2 ≤ 3 mm is satisfied.

[0028] In the above aspect, when the distance C1 between the bottom surface of the groove and the first wall and the distance C2 between the first surface and the first wall satisfy the above relationship, compared with the case of 0.5 mm ≤ C1 - C2 ≤ 5 mm, it is further ensured that gas flows smoothly toward the pressure relief mechanism, and the energy density of the battery cell is ensured by reasonably using the mounting space.

[0029] In some embodiments of the present application, the battery cell further includes a support member including a bottom wall and a side wall, the bottom wall is applied to the bottom surface of the groove, and the side wall is formed at the edge of the bottom wall and applied to the side surface of the groove.

[0030] In the above aspect, the support member is provided in the groove, the bottom wall is applied to the bottom surface of the groove, and the side wall is applied to the side surface of the groove, thereby further improving the strength of the reinforcing portion, reducing the risk that the pressure relief mechanism is blocked and closed, and ensuring the pressure release by the pressure relief mechanism.

[0031] In some embodiments of the present application, the support member further includes a second bending portion, the second bending portion is connected to the side wall, is located outside the groove, and is applied to the first surface.

[0032] In the above aspect, by applying the second bending portion to the first surface, a large connection area between the support member and the adapter is ensured, and good connection stability between the support member and the adapter is ensured.

[0033] In some embodiments of the present application, the tab connection portion includes a main body segment and a connection segment, the connection segment is connected to the tab, and the reinforcing portion is provided on the main body segment.

[0034] In the above aspect, by connecting the connection segment to the tab and providing the reinforcing portion on the main body segment, the reinforcing portion is prevented from interfering with the connection between the tab connection portion and the tab.

[0035] In some embodiments of the present application, the connection segment protrudes from the second surface, and the height of the reinforcing portion protruding from the second surface is not more than the height of the connection segment protruding from the second surface.

[0036] In the above aspect, by setting the height of the reinforcing portion protruding from the second surface to be not more than the height of the connection segment protruding from the second surface, the space occupied by the reinforcing portion in the thickness direction is reduced, the strength of the reinforcing portion is ensured, and the connection between the connection segment and the tab is not interfered.

[0037] In some embodiments of this application, the battery cell further includes a stopper provided between the first wall and the reinforcing portion, the stopper being configured to contact the first wall and the reinforcing portion when the battery cell experiences thermal runaway, thereby forming a second exhaust passage between the reinforcing portion and the first wall.

[0038] In the above embodiment, when the battery cell experiences thermal runaway, the stopper comes into contact with the first wall and the reinforcing portion, forming a second exhaust passage between the reinforcing portion and the first wall. This makes it easier for the gas to flow through the second exhaust passage towards the pressure relief mechanism, facilitating pressure release by the pressure relief mechanism.

[0039] In some embodiments of this application, the battery cell further includes an insulating member located between the first wall and the adapter to insulate and separate the first wall from the adapter, the stopper having a melting point higher than the melting point of the insulating member, and the stopper is configured to prevent the adapter from obstructing the pressure relief mechanism after the insulating member has melted.

[0040] In the above embodiment, the insulating member insulates and separates the first wall from the adapter, thereby preventing a short circuit between the first wall and the adapter. Furthermore, by setting the melting point of the stopper higher than that of the insulating member, the stopper will not melt even if the insulating member melts during thermal runaway of the battery cell, thus forming a second exhaust passage between the reinforcing portion and the first wall.

[0041] In some embodiments of this application, the first wall has a third surface facing the interior of the battery cell, and the stopper is fixed to the first wall and protrudes from the third surface.

[0042] In the above embodiment, the stopper is fixed to the first wall, thereby ensuring the strength of the connection between the stopper and the first wall, and the stopper protruding from the third surface facilitates the formation of a second exhaust passage between the reinforcing portion and the third surface.

[0043] In some embodiments of this application, the insulating member includes a fourth surface facing the first wall and a fifth surface away from the first wall, and the insulating member is provided with a housing portion for housing the stopper, the housing portion having a projection formed on the fifth surface and a groove corresponding to the projection formed on the fourth surface.

[0044] In the above embodiment, the provision of a housing ensures insulation between the first wall and the adapter.

[0045] In some embodiments of this application, the adapter includes a tab connector that connects to the tab, the tab connector having a first surface facing the first wall, and when H1 is the distance between the sixth surface of the projection facing the tab connector and the first wall, H2 is the distance between the first surface and the first wall, and W1 is the thickness of the reinforcing portion in the thickness direction, then H1 + W1 ≤ H2.

[0046] In the above embodiment, the distance H1 between the sixth surface and the third surface, the distance H2 between the first surface and the third surface, and the thickness W1 of the reinforcing portion satisfy the above relationship in the thickness direction, thereby reducing the space occupied and allowing the stopper to contact the reinforcing portion and form a second exhaust passage when the battery cell experiences thermal runaway.

[0047] In some embodiments of this application, the melting point of the stopper is higher than 200°C.

[0048] In the above embodiment, the melting point of the stopper satisfies the above conditions, preventing the stopper from easily melting and ensuring an excellent stopping effect.

[0049] In some embodiments of this application, the stopper includes a first substopper and a second substopper, and the pressure relief mechanism is provided between the first substopper and the second substopper.

[0050] In the above embodiment, the pressure relief mechanism is provided between the first substopper and the second substopper, thereby securing the reinforcing portion at two points and further ensuring the stopping effect of the stopper.

[0051] In some embodiments of this application, in the thickness direction, the projection of the reinforcing portion onto the first wall covers at least a portion of the first substopper and at least a portion of the second substopper.

[0052] In the above embodiment, the projection of the reinforcing portion covers at least a part of the first substopper and at least a part of the second substopper, thereby forming a simple girder and reducing the risk of deformation of the reinforcing portion.

[0053] In some embodiments of this application, in the thickness direction, the projections of the centers of the first substopper and the second substopper onto the adapter fall within the reinforcing portion.

[0054] In the above embodiment, the projection of the center of the first substopper and the center of the second substopper onto the adapter falls within the reinforcing portion, thereby securing a large overlapping area between the first substopper and the second substopper of the reinforcing portion. This ensures that the first and second substoppers effectively hold the reinforcing portion in place during thermal runaway of the battery cell, reducing the risk of the reinforcing portion deforming and obstructing or blocking the relief holes.

[0055] In some embodiments of this application, the tab is formed at the end of the electrode unit near the first wall, and the electrode lead-out is provided on the first wall.

[0056] In the above embodiment, the electrode lead-out portion is provided on the first wall, and by reducing the distance between the tab and the first wall, the size of the adapter in the thickness direction of the first wall is reduced, making it easier to achieve electrical connection between the tab and the electrode lead-out portion.

[0057] In a second embodiment, the present application provides a battery comprising a housing and a plurality of battery cells according to the above embodiment, wherein the plurality of battery cells are installed within the housing.

[0058] In a third embodiment, the present application provides an electrical device, which includes a battery cell according to the above embodiment.

[0059] Other aspects and advantages of this application are partially shown in the following description, partially revealed based on the following description, or understood through the practice of this application. [Brief explanation of the drawing]

[0060] To more clearly explain the technical concepts of the embodiments in this application, the drawings necessary for describing the embodiments are briefly described below. The drawings described are only a selection of embodiments of this application. A person skilled in the art can obtain other drawings based on these drawings without inventive ability. The drawings are not drawn to scale. [Figure 1] This is a schematic diagram of the vehicle configuration according to several embodiments of this application. [Figure 2] This is an exploded view of a battery according to some embodiments of this application. [Figure 3] This is an exploded view of a battery cell according to some embodiments of this application. [Figure 4] This is a schematic diagram illustrating the configuration of some components of a battery cell according to several embodiments of this application. [Figure 5] This is a schematic diagram of the unfolded state of an adapter according to some embodiments of this application. [Figure 6] This is a plan view of a battery cell according to some embodiments of this application. [Figure 7] This is a schematic diagram of the adapter in its deployed state according to some other embodiments of this application. [Figure 8] This is a schematic diagram of the configuration of a reinforcing part according to several embodiments of this application. [Figure 9] Schematic diagrams illustrating the configuration of reinforcing parts according to some other embodiments of this application. [Figure 10] This is a schematic diagram of the configuration of a reinforcing part according to several other embodiments of this application. [Figure 11] This is a magnified view of part A in Figure 10. [Figure 12] This is a schematic diagram of the first exhaust passage according to some embodiments of the present application. [Figure 13] This is a cross-sectional view of some components of a battery cell according to several embodiments of this application. [Figure 14] This is a partial cross-sectional view of a battery cell after thermal runaway (melting of the insulating material) according to some embodiments of this application. [Figure 15] This is a cross-sectional view of some components of a battery cell according to several embodiments of this application. [Figure 16] This is a schematic diagram of the configuration of the first wall according to some embodiments of this application. [Modes for carrying out the invention]

[0061] To clarify the purpose, technical concept, and advantages of the embodiments of this application, the technical concept of the embodiments will be clearly described below with reference to the drawings of the embodiments of this application. The embodiments described are only a selection of embodiments of this application and, naturally, not all embodiments. All other embodiments obtained by a person skilled in the art without using their inventive ability, based on the embodiments of this application, also fall within the scope of protection of this application.

[0062] Unless otherwise specified, all technical and scientific terms used in this application have the same meaning as those commonly understood by a general expert in the art to which this application pertains. In this application, the terms used in the specification are solely for the purpose of specifically describing the embodiments and are not intended to limit this application. Furthermore, the terms “includes,” “has,” and their synonyms in the description of the specification, claims, and drawings of this application are intended to cover non-exclusive inclusion. Terms such as “first,” “second,” etc., in the description, claims, and drawings of this application are solely for the purpose of distinguishing similar subjects and are not intended to limit any particular order or priority.

[0063] The term “Examples” as used in this application means that certain features, structures, or properties described in relation to the Examples may be included in at least one Example of this Application. The appearance of this term in various parts of the Specification does not all refer to the same Example, nor do they represent separate or alternative Examples excluding each other.

[0064] In the description of this application, unless otherwise clearly defined or limited, terms such as “attachment,” “connection,” “joining,” and “fixing” should be understood in a broad sense. For example, it could be a fixed connection, a removable connection, or an integral connection. It could also be a direct connection, an indirect connection via an intermediate object, or two elements communicating internally or interacting with each other. A person skilled in the art will be able to understand the specific meaning of the above terms in this application depending on the specific situation.

[0065] In the embodiments of this application, similar reference numerals indicate similar parts, and for the sake of brevity, detailed descriptions of the same parts are omitted between different embodiments. Furthermore, the dimensions such as thickness, length, and width of each part of the embodiments of this application shown in the drawings, as well as the overall dimensions such as thickness, length, and width of the integrating device, are illustrative only and should not be understood as limiting to this application.

[0066] In this application, "multiple" means two or more (including two).

[0067] In this application, the term "battery cell" may include, but is not limited to, a battery cell for a lithium-ion secondary battery, a battery cell for a lithium-ion primary battery, a battery cell for a lithium-sulfur battery, a battery cell for a sodium-lithium-ion battery, a battery cell for a sodium-ion battery, or a battery cell for a magnesium-ion battery.

[0068] The battery described in the embodiments of this application is a single physical module comprising one or more battery cells to provide higher voltage and capacity. The battery typically comprises a housing for enclosing one or more battery cells. The housing can prevent liquids or other foreign matter from affecting the charging and discharging of the battery cells.

[0069] A battery cell comprises an electrode unit and an electrolyte, the electrode unit consisting of a positive electrode plate, a negative electrode plate, and a separator. The battery cell operates primarily by the movement of metal ions between the positive and negative electrode plates. The positive electrode plate comprises a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode current collector. A positive electrode current collector without the positive electrode active material layer protrudes from a positive electrode current collector with the positive electrode active material layer and is used as a positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode current collector is aluminum, and the positive electrode active material may be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode plate comprises a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. A negative electrode current collector without a negative electrode active material layer is used as a negative electrode tab, protruding from a negative electrode current collector with a negative electrode active material layer. The negative electrode current collector is made of copper, and the negative electrode active material may be carbon, silicon, etc. To ensure that it does not melt even when a large current passes through it, multiple positive electrode tabs are provided and stacked, and multiple negative electrode tabs are provided and stacked. The separator material may be PP (polypropylene) or PE (polyethylene), etc.

[0070] The battery cell further includes an electrode lead section and an adapter, the electrode lead section extracts electrical energy from the battery cell, and the adapter connects the electrode lead section to a tab.

[0071] As battery technology advances, many design elements must be considered, including performance parameters such as energy density, cycle life, discharge capacity, and C-rate. Furthermore, battery safety must also be taken into consideration.

[0072] A pressure relief mechanism refers to an element or component in a battery cell that operates to release internal pressure or heat. The operation of the pressure relief mechanism may occur when the internal pressure or temperature of the battery cell reaches a preset threshold, or it may be controlled to open by measurement and adjustment of a measuring device. The pressure relief mechanism may be an explosion-proof valve, an air valve, a pressure relief valve, or a safety valve. Furthermore, it may employ a pressure-sensitive element or a temperature-sensitive element, or a pressure-sensitive structure or temperature-sensitive structure, or the formation of a notch in the battery cell case. That is, when the internal pressure or temperature of the battery cell reaches a preset threshold, the pressure relief mechanism is activated, or a vulnerable structure provided in the pressure relief mechanism is destroyed, thereby forming a relief hole to release the internal pressure or heat.

[0073] As used in this application, “operation” means that the pressure relief mechanism operates or is activated until it reaches a specific state in which it releases internal pressure and heat from the battery cell. Operation of the pressure relief mechanism includes, but is not limited to, rupture, shattering, tearing, or opening of at least a portion of the pressure relief mechanism. This allows the pressure and heat from the battery cell to be released within a controllable range of pressure or temperature, thereby avoiding the occurrence of potentially more serious accidents.

[0074] The pressure relief mechanism in battery cells is crucial for battery safety. For example, in the event of a short circuit or overcharging, thermal runaway can occur inside the battery cell, causing pressure and temperature to rise. In this case, the pressure relief mechanism releases the internal pressure and heat, preventing the battery cell from exploding or catching fire.

[0075] In conventional technology, even if a pressure relief mechanism is provided in the battery cell, explosions or fires can still occur in the battery cell. The inventors' research has shown that the cause of the above problem is that when thermal runaway occurs in the battery cell, the pressure relief mechanism activates and forms a relief hole for exhaust, but the insulating material that separates the housing and the adapter melts, causing the adapter to deform during exhaust and obstruct or block the relief hole. As a result, the internal pressure of the battery cell cannot be released, or the release rate is drastically reduced, leading to the explosion or fire of the battery cell.

[0076] In light of this, to address the problem of the adapter deforming and obstructing the pressure relief mechanism during thermal runaway of the battery cell, thereby compromising the safety of the battery cell, the inventors diligently conducted research and developed a battery cell with a reinforced adapter. This reinforcement improves the strength of the adapter and makes it less likely to deform during thermal runaway of the battery cell, thereby reducing the risk of the adapter obstructing the pressure relief mechanism and resulting in a battery cell with high safety.

[0077] In such a battery cell, the projection of the reinforcing part covers at least a portion of the pressure relief mechanism. Therefore, if thermal runaway occurs in the battery cell, the pressure relief mechanism activates to release internal pressure, and the gas inside the battery cell flows toward the pressure relief mechanism. Because the reinforcing part improves the strength of the adapter, even if airflow acts on the adapter, the adapter is less likely to deform, and the reinforcing part is also less likely to deform, reducing the risk of obstructing or blocking the relief holes, making it easier for the pressure relief mechanism to release pressure, and improving the safety of the battery cell.

[0078] The battery cells disclosed in the embodiments of this application can be applied to, but are not limited to, electrical equipment such as vehicles, ships, or aircraft. Furthermore, the battery cells and batteries disclosed in this application may be used to configure a power supply system for such electrical equipment.

[0079] Embodiments of this application provide battery-powered electrical equipment. Electrical equipment may include, but is not limited to, vehicles, mobile phones, portable devices, laptop computers, ships, aircraft, electric toys, and power tools. Vehicles include gasoline cars, natural gas cars, or new energy cars, and new energy cars include electric cars, hybrid cars, or range-extender electric cars. Aircraft include airplanes, rockets, space shuttles, and spacecraft. Electric toys include stationary or mobile toys, such as game consoles, electric car toys, electric boat toys, and electric airplane toys. Power tools include metal cutting power tools, polishing power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers. Embodiments of this application are not particularly limited to the above-mentioned electrical equipment.

[0080] In the following embodiments, for the sake of explanation, we will use the example where the electrical equipment is a vehicle.

[0081] Figure 1 is a schematic diagram of the configuration of a vehicle according to several embodiments of this application. As shown in Figure 1, a battery 100 is located inside the vehicle 1000. The battery 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 100 is for supplying power to the vehicle 1000 and can, for example, serve as the operating power source for the vehicle 1000.

[0082] The vehicle 1000 further includes a controller 200 and a motor 300. The controller 200 controls the battery 100 to supply power to the motor 300, and controls the battery 100 to supply the power necessary for starting, navigating, and driving the vehicle 1000, for example.

[0083] In some embodiments of this application, the battery 100 can be used not only as an operating power source for the vehicle 1000, but also as a power source for the vehicle 1000 to provide driving power to the vehicle 1000 instead of gasoline or natural gas.

[0084] Figure 2 is an exploded view of a battery according to some embodiments of the present application. As shown in Figure 2, the battery 100 includes a housing 10 and battery cells 20, the battery cells 20 being located inside the housing 10.

[0085] Here, the housing 10 is a component that houses the battery cell 20 and provides a housing space for the battery cell 20, and may be composed of multiple structures. In some embodiments, the housing 10 includes a first part 11 and a second part 12, and when the first part 11 and the second part 12 are combined, they form a housing space for housing the battery cell 20. The first part 11 and the second part 12 may be formed in various shapes, such as a rectangular parallelepiped or a cylinder. The first part 11 may be a hollow structure with one end open, and the second part 12 may also be a hollow structure with one end open, and the combination of the open side of the second part 12 and the open side of the first part 11 forms a housing 10 having a housing space. Alternatively, the first part 11 may be a hollow structure with one end open, and the second part 12 may be a plate-like structure, and the second part 12 may cover the open side of the first part 11 to form a housing 10 having a housing space. The first portion 11 and the second portion 12 may be sealed by sealing members such as a sealing ring or sealant.

[0086] The battery 100 may include a plurality of battery cells 20. The plurality of battery cells 20 may be connected in series, in parallel, or in series-parallel. Series-parallel refers to connecting the plurality of battery cells 20 in series and in parallel. The plurality of battery cells 20 may first be connected in series, in parallel, or in series-parallel to form a battery module, and then the plurality of battery modules may be connected in series, in parallel, or in series-parallel to form a single unit and housed in the housing 10. Alternatively, all the battery cells 20 may be directly connected in series, in parallel, or in series-parallel, and then the entire unit composed of all the battery cells 20 may be housed in the housing 10.

[0087] In some embodiments, the battery 100 may further include a busbar. Multiple battery cells 20 can be electrically connected by the busbar, thereby enabling series, parallel, or series-parallel connections of the multiple battery cells 20. The busbar may be a metal conductor, such as copper, iron, aluminum, stainless steel, or an aluminum alloy.

[0088] Figure 3 is an exploded view of a battery cell according to some embodiments of the present application. As shown in Figure 3, the battery cell 20 includes a housing 21, a pressure relief mechanism 22, an electrode lead-out section 23, an electrode unit 24, and an adapter 25.

[0089] The housing 21 is a component for housing the electrode unit 24. The housing 21 can be formed in various shapes, such as a cylinder or a rectangular parallelepiped. The housing 21 includes a housing body 211 and a lid 212. The lid 212 covers the opening of the housing body 211 and together with the housing body 211 forms a sealed space.

[0090] Here, the housing body 211 may be a hollow structure with an opening formed at one end, or a hollow structure with openings formed at both opposing ends. The material of the housing body 211 can vary and may be, for example, copper, iron, aluminum, steel, aluminum alloy, etc.

[0091] The cover 212 is a component that seals the opening of the housing body 211, isolating the internal environment of the battery cell 20 from the external environment. The cover 212 and the housing body 211 form a sealed space for housing the electrode unit 24, electrolyte, and other components. The cover 212 may be connected to the housing body 211 by welding or crimping to seal the opening of the housing body 211. The shape of the cover 212 corresponds to the shape of the housing 21. For example, if the housing body 211 has a rectangular parallelepiped structure, the cover 212 may have a rectangular plate-like structure corresponding to the housing 21. Alternatively, if the housing body 211 has a cylindrical structure, the cover 212 may have a disc-like structure corresponding to the housing body 211. The material of the cover 212 can vary and may be copper, iron, aluminum, steel, aluminum alloy, etc.

[0092] The battery cell 20 may include one or two covers 212. In embodiments where the housing body 211 is a hollow structure with openings at both ends, two covers 212 are provided. The two covers 212 each close the two openings of the housing body 211, and the two covers 212 and the housing body 211 form a sealed space. In embodiments where the housing body 211 is a hollow structure with an opening at one end, one cover 212 is provided. The cover 212 closes the opening at one end of the housing body 211, and the one cover 212 and the housing body 211 form a sealed space.

[0093] The electrode unit 24 is a component in the battery cell 20 where an electrochemical reaction occurs. The electrode unit 24 includes a positive electrode plate, a negative electrode plate, and a separator. The electrode unit 24 may be a wound structure formed by winding the positive electrode plate, the separator, and the negative electrode plate. The electrode unit 24 has a positive electrode tab and a negative electrode tab, where the positive electrode tab is the portion of the positive electrode plate that is not coated with a positive electrode active material layer, and the negative electrode tab is the portion of the negative electrode plate that is not coated with a negative electrode active material layer. The electrode unit 24 includes a main body portion 241 and tabs 242 extending from the ends of the main body portion 241. For example, the positive electrode tab and the negative electrode tab may extend from one end of the main body portion 241, or from two opposing ends of the main body portion 241.

[0094] The pressure relief mechanism 22 is an element or component that operates when the battery cell 20 experiences thermal runaway to release internal pressure or temperature. As shown in Figure 3, the pressure relief mechanism 22 is provided on the lid 212. In other embodiments, the pressure relief mechanism 22 may be provided on the housing body 211.

[0095] The electrode lead-out section 23 is a component that extracts electrical energy from the battery cell 20 and is used for electrical connection with adjacent battery cells 20 or other conductive components. As shown in Figure 3, the electrode lead-out section 23 is provided on the cover 212. In other embodiments, the electrode lead-out section 23 may be provided on the housing body 211. The electrode lead-out section 23 may be an electrode terminal attached to the first wall 213, or it may be part of the housing 21.

[0096] The adapter 25 is a component that enables electrical connection between the electrode lead-out section 23 and the tab 242.

[0097] Figure 4 is a schematic diagram of the configuration of some components of a battery cell according to some embodiments of this application, Figure 5 is a schematic diagram of the adapter in an unfolded state according to some embodiments of this application, and Figure 6 is a plan view of a battery cell according to some embodiments of this application. Figure 6 is also a schematic diagram showing the projection of the pressure relief mechanism and tab connection along the thickness direction of the first wall. As shown in Figures 3 to 6, some embodiments of this application provide a battery cell 20. The battery cell 20 includes a housing 21, a pressure relief mechanism 22, an electrode lead-out section 23, an electrode unit 24, and an adapter 25. The housing 21 has a first wall 213, and the pressure relief mechanism 22 is provided in the first wall 213. The electrode lead-out section 23 is provided in the housing 21. The electrode unit 24 is provided inside the housing 21 and includes a tab 242. The adapter 25 connects the electrode lead-out section 23 and the tab 242. Here, the adapter 25 is provided with a reinforcing portion 2511, and the projection of the reinforcing portion 2511 onto the first wall 213 in the thickness direction of the first wall 213 covers at least a portion of the pressure relief mechanism 22.

[0098] In the drawing, the direction indicated by the letter Z is the thickness direction Z of the first wall 213.

[0099] The electrode unit 24 includes a main body 241 and a tab 242 extending from the main body 241. The tab 242 may extend from both sides of the main body 241 or from one side of the main body 241.

[0100] The electrode lead-out section 23 may be provided in the housing 21 in various ways. For example, the electrode lead-out section 23 may be provided on the first wall 213, or on another wall of the housing 21, such as a wall adjacent to the first wall 213. The electrode lead-out section 23 may also be an electrode terminal.

[0101] The adapter 25 is a component that enables electrical connection between the electrode lead-out section 23 and the tab 242.

[0102] The reinforcing portion 2511 is a structure that improves the strength of the adapter 25 so that the adapter 25 is less likely to deform. For example, the reinforcing portion 2511 is provided on the tab connection portion 251, and the position or region of the tab connection portion 251 where the reinforcing portion 2511 is provided is less likely to deform even when an external force (e.g., airflow) is applied.

[0103] The phrase "the projection of the reinforcing portion 2511 onto the first wall 213 covers at least a portion of the pressure relief mechanism 22" means that the projection of the reinforcing portion 2511 onto the first wall 213 may cover only a portion of the pressure relief mechanism 22, or it may cover the pressure relief mechanism 22 completely.

[0104] In some embodiments, the reinforcing portion 2511 is an annular structure. In this case, the strength of the region enclosed by the contour of the annular structure is improved. The projection of the region enclosed by the contour of this annular structure onto the first wall 213 covers at least a portion of the pressure relief mechanism 22.

[0105] According to the embodiment of the present application, if thermal runaway occurs in the battery cell 20, the pressure relief mechanism 22 is activated to form a relief hole 221 that connects the inside and outside of the battery cell 20 (see Figure 14). The adapter 25 is provided with a reinforcing portion 2511 to improve the strength of the adapter 25, and the projection of the reinforcing portion 2511 onto the first wall 213 covers at least a part of the pressure relief mechanism 22. As a result, the part of the adapter 25 corresponding to the pressure relief mechanism 22 is less likely to deform, reducing the risk of the adapter 25 obstructing or blocking the relief hole, ensuring pressure release for the battery cell 20, and giving the battery cell 20 high safety.

[0106] In some embodiments of this application, the adapter 25 includes a tab connector 251 that connects to a tab 242, and a reinforcing portion 2511 is provided on the tab connector 251.

[0107] The adapter 25 further includes an extraction section connection section 252 that connects to the electrode extraction section 23, and the tab connection section 251 and the extraction section connection section 252 may be located at opposite ends of the adapter 25. The reinforcing section 2511 is provided on the tab connection section 251, so that even if an external force (e.g., airflow) is applied, the position or region of the tab connection section 251 where the reinforcing section 2511 is provided is less likely to deform. If thermal runaway occurs in the battery cell 20, the tab connection section 251 will also deform due to the deformation of the tab 242 and move closer to the first wall 213, so by providing the reinforcing section 2511 on the tab connection section 251, the tab connection section 251 becomes less likely to deform. Furthermore, the tab connection portion 251 generally has a large area, and its projection onto the first wall 213 covers the pressure relief mechanism 22, while the drawer connection portion 252 generally has a small area, and its projection onto the first wall 213 does not cover the pressure relief mechanism 22. Therefore, a reinforcing portion 2511 is provided on the tab connection portion 251.

[0108] Figure 7 is a schematic diagram of the unfolded state of the adapter according to some other embodiments of the present application. In some embodiments of the present application, as shown in Figure 7, the reinforcing portion 2511 is the first bent portion of the tab connector 251. The tab connector 251 has a first surface 251a facing the first wall 213 (see Figure 4) and a second surface 251b moving away from the first wall 213, and the first bent portion is bent either toward the first surface 251a side or the second surface 251b side.

[0109] The reinforcing portion 2511 may also be a bent structure of the tab connection portion 251.

[0110] The first surface 251a and the second surface 251b are two opposing surfaces of the tab connection portion 251 in the thickness direction, and the thickness direction of the tab connection portion 251 is parallel to the thickness direction Z of the first wall 213.

[0111] The first bent portion is bent toward the first surface 251a, in other words, the reinforcing portion 2511 is formed when the tab connecting portion 251 is bent toward the first surface 251a. The first bent portion is bent toward the second surface 251b, in other words, the reinforcing portion 2511 is formed when the tab connecting portion 251 is bent toward the second surface 251b.

[0112] The reinforcing portion 2511 is a first bent portion, and the molding process is facilitated by bending the first bent portion toward either the first surface 251a or the second surface 251b.

[0113] In some embodiments, the reinforcing portion 2511 is connected to the edge of the tab connector portion 251 so that it can be easily bent.

[0114] In some embodiments of this application, the first bent portion is applied to either the first surface 251a or the second surface 251b.

[0115] When the first bent portion is positioned against the first surface 251a, the contact area between the first bent portion and the first surface 251a is increased. If thermal runaway occurs in the battery cell 20 and airflow acts on the tab connection portion 251, the first bent portion can prevent the first surface 251a from deforming toward the first wall 213. As a result, the area of ​​the first bent portion that covers the first surface 251a is less likely to deform, reducing the risk of the tab connection portion 251 obstructing or blocking the relief hole.

[0116] As the first bent portion is positioned against the second surface 251b, the contact area between the first bent portion and the second surface 251b increases. If thermal runaway occurs in the battery cell 20 and airflow acts on the tab connection portion 251, the second surface 251b can prevent the first bent portion from deforming toward the first wall 213. This makes the area of ​​the first bent portion that covers the second surface 251b less prone to deformation, reducing the risk of the tab connection portion 251 obstructing or blocking the relief hole.

[0117] Figure 8 is a schematic diagram of the configuration of the reinforcing portion according to some embodiments of this application. In some embodiments of this application, as shown in Figure 8, the tab connection portion 251 has a first surface 251a facing the first wall 213 and a second surface 251b away from the first wall 213, and a projection 2511a is formed on the first surface 251a, and the projection 2511a is the reinforcing portion 2511.

[0118] The first surface 251a and the second surface 251b are two opposing surfaces in the thickness direction of the tab connection portion 251. If the reinforcing portion 2511 is a projection 2511a formed on the first surface 251a, the reinforcing portion 2511 protrudes from the first surface 251a in the thickness direction of the tab connection portion 251.

[0119] The tab connector 251 includes the main body segment 2512. The main body segment 2512 connects to the tab 242, and the reinforcing portion 2511 is provided on the main body segment 2512. The reinforcing portion 2511 may be provided separately from the main body segment 2512 and fixed to the first surface 251a. For example, the reinforcing portion 2511 is a plate-like or sheet-like structure and is welded to the main body segment 2512. Alternatively, the reinforcing portion 2511 is part of the main body segment 2512, for example, a press-formed portion of the tab connector 251, or a thickened portion of the tab connector 251.

[0120] Figure 9 is a schematic diagram of the configuration of the reinforcing portion according to some other embodiments of this application. In some embodiments of this application, as shown in Figure 9, a groove 2511b is formed at a position corresponding to the projection 2511a on the second surface 251b.

[0121] In some embodiments, as shown in Figure 9, the reinforcing portion 2511 is integrally molded with the tab connector portion 251 and protrudes from the first surface 251a. A groove 2511b is formed on the second surface 251b at a position corresponding to the projection 2511a. Based on the above structure, the reinforcing portion 2511 may also be a reinforcing bar formed by press molding relative to the tab connector portion 251.

[0122] In the above embodiment, by forming grooves corresponding to the protrusions on the second surface 251b, the molding process of the reinforcing portion 2511 is facilitated, and the weight of the tab connecting portion 251 can be reduced.

[0123] In some embodiments of this application, as shown in Figures 7 to 9, the reinforcing portion 2511 is located on the side of the tab connection portion 251 facing the first wall 213 (see Figure 4).

[0124] The tab connection portion 251 has a first surface 251a facing the first wall 213, and the reinforcing portion 2511 is located on the first surface 251a side of the tab connection portion 251; in other words, the reinforcing portion 2511 is provided on the first surface 251a.

[0125] Since the reinforcing portion 2511 is located on the side of the tab connector 251 facing the first wall 213, it is possible to prevent the tab connector 251 from deforming toward the first wall 213, thereby reducing the risk of the tab connector 251 obstructing or blocking the relief hole.

[0126] Figure 10 is a schematic diagram of the configuration of the reinforcing portion according to some other embodiments of the present application, and Figure 11 is a partially enlarged view of portion A in Figure 10. In some embodiments of the present application, as shown in Figures 10 and 11, the tab connection portion 251 has a first surface 251a facing the first wall 213 and a second surface 251b away from the first wall 213, and the reinforcing portion 2511 has a projection formed on the second surface 251b and a groove formed on the first surface 251a at a position corresponding to the projection.

[0127] The reinforcing portion 2511 may be formed by press molding of the adapter 25. Since the reinforcing portion 2511 has protrusions formed on the second surface 251b and grooves formed on the first surface 251a, the strength of the adapter 25 is improved and the adapter 25 becomes less likely to deform toward the first wall 213.

[0128] In some embodiments of this application, the projection of the groove onto the first wall 213 covers at least a portion of the pressure relief mechanism 22.

[0129] The fact that the projection of the groove onto the first wall 213 covers at least a portion of the pressure relief mechanism 22 means that the projection of the groove onto the first wall 213 may cover only a portion of the pressure relief mechanism 22, or it may cover the pressure relief mechanism 22 completely. In the above installation, there is a gap between the pressure relief mechanism 22 and the tab connector 251 in the thickness direction Z of the first wall 213, thereby reducing the risk of the tab connector 251 obstructing or blocking the relief hole.

[0130] In the above embodiment, the projection of the groove onto the first wall 213 covers at least a portion of the pressure relief mechanism 22, making it less likely for the reinforcing portion 2511 to deform and obstruct or block the relief hole, thereby ensuring pressure release for the battery cell 20.

[0131] In some embodiments of this application, as shown in Figure 10, the groove extends to the edge of the adapter 25.

[0132] In an embodiment in which the reinforcing portion 2511 is provided on the tab connection portion 251, the groove may extend to the edge of the tab connection portion 251 so as to communicate with the space on the side of the tab connection portion 251. This allows the gas in the battery cell 20 to flow toward the pressure relief mechanism 22, by passing through the edge of the tab connection portion 251 into the groove and flowing toward the pressure relief mechanism 22.

[0133] In the above embodiment, the groove extends to the edge of the adapter, forming a passage through which gas flows to the reinforcing portion 2511. This makes it easier for gas to flow through the reinforcing portion 2511 towards the pressure relief mechanism 22, facilitating pressure release by the pressure relief mechanism 22.

[0134] Figure 12 is a schematic diagram of a first exhaust passage according to some embodiments of the present application. In some embodiments of the present application, as shown in Figure 12, a first exhaust passage 2514 is provided in the groove wall of the groove, connecting the inside and outside of the groove.

[0135] The first exhaust passage 2514 is a passage that penetrates the groove wall of the groove, and the first exhaust passage 2514 may also be a through hole.

[0136] In the above embodiment, the first exhaust passage 2514 connects the inside and outside of the groove, making it easier for gas to enter the groove through the exhaust passage and flow toward the pressure relief mechanism 22, ensuring smooth gas flow and facilitating pressure release by the pressure relief mechanism 22.

[0137] Figure 13 is a cross-sectional view of some components of a battery cell according to some embodiments of this application. In some embodiments of this application, as shown in Figure 13, if the distance between the bottom surface of the groove and the first wall 213 is C1 and the distance between the first surface 251a and the first wall 213 is C2 in the thickness direction Z, then the condition 0.5 mm ≤ C1 - C2 ≤ 5 mm is satisfied.

[0138] In the thickness direction Z, the opening of the groove faces the first wall 213, and the groove is formed by the first surface being recessed in a direction away from the first wall 213 in the thickness direction Z, with the bottom surface of the groove being the surface facing the first wall 213. The bottom surface of the groove is further away from the first wall 213 than the first surface.

[0139] In the above embodiment, the distance C1 between the bottom surface of the groove and the first wall 213 and the distance C2 between the first surface 251a and the first wall 213 satisfy the above relationship, ensuring that gas flows toward the pressure relief mechanism 22 and making it less likely for the reinforcing portion 2511 to block the relief hole even if it deforms. In addition, since the reinforcing portion 2511 does not occupy too much of the mounting space, it ensures that the battery cell 20 has a high energy density. The reinforcing portion 2511 deforms when the battery cell 20 experiences thermal runaway. If the value obtained by subtracting the distance C2 between the first surface 251a and the first wall 213 from the distance C1 between the bottom surface of the groove and the first wall 213 is less than 0.5 mm, the reinforcing portion 2511 is more likely to obstruct or block the relief hole after deformation, affecting the pressure release by the pressure relief mechanism 22. If the difference between the distance C1 between the bottom surface of the groove and the first wall 213 and the distance C2 between the first surface 251a and the first wall 213 is greater than 5 mm, the mounting space occupied by the reinforcing portion 2511 in the thickness direction Z will increase, affecting the energy density of the battery cell 20.

[0140] Optionally, the difference between the distance C1 between the bottom surface of the groove and the first wall 213 and the distance C2 between the first surface 251a and the first wall 213 may be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, etc.

[0141] In some embodiments of this application, the condition 1 mm ≤ C1-C2 ≤ 3 mm is satisfied.

[0142] When the distance C1 between the bottom surface of the groove and the first wall 213 and the distance C2 between the first surface 251a and the first wall 213 satisfy the above relationship, compared to the case where 0.5 mm ≤ C1 - C2 ≤ 5 mm, it is further ensured that the gas flows smoothly toward the pressure relief mechanism 22, and the energy density of the battery cell 20 is ensured by rationally utilizing the mounting space.

[0143] Optionally, the difference between the distance C1 between the bottom surface of the groove and the first wall 213 and the distance C2 between the first surface 251a and the first wall 213 may be 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, etc.

[0144] In some embodiments of this application, as shown in Figures 10 and 11, the battery cell 20 further includes a support member 26 having a bottom wall 261 and a side wall 262, the bottom wall 261 being fitted to the bottom surface of the groove, and the side wall 262 being formed on the edge of the bottom wall 261 and fitted to the side surface of the groove.

[0145] The support member 26 is a component for supporting the reinforcing portion 2511. When the battery cell 20 experiences thermal runaway, the support member 26 suppresses deformation of the reinforcing portion 2511, making it less susceptible to deformation.

[0146] The bottom wall 261 and the side wall 262 are two components of the support member 26, with the side wall 262 being formed on the edge of the bottom wall 261 and integrally molded with the bottom wall 261.

[0147] The bottom wall 261 is positioned against the bottom surface of the groove, and since it has a large contact area with the bottom surface of the groove, it has an excellent stopping effect against the bottom surface of the groove. The bottom wall 261 may be welded to the bottom surface of the groove to ensure connection strength with the bottom surface of the groove.

[0148] The side wall 262 is positioned against the side of the groove and has a large contact area with the side of the groove, thus providing an excellent stopping effect against the side of the groove. The side wall 262 may be welded to the side of the groove to ensure connection strength with the side of the groove.

[0149] In the above embodiment, the support member 26 is provided in the groove, the bottom wall 261 is positioned against the bottom surface of the groove, the side wall 262 is positioned against the side surface of the groove, and the contour of the support member 26 corresponds to the contour of the groove. This further improves the strength of the reinforcing portion 2511, reduces the risk of the pressure relief mechanism 22 being obstructed and blocked, and ensures pressure release by the pressure relief mechanism 22.

[0150] In some embodiments of this application, as shown in Figure 11, the support member 26 further includes a second bent portion 263, which is connected to the side wall 262, located outside the groove, and facing the first surface 251a.

[0151] The second bent section 263 is a bent structure connected to the side wall 262.

[0152] The second bent portion 263 is located outside the groove and is positioned against the first surface 251a, thereby ensuring good connection stability between the support member 26 and the tab connection portion 251. The second bent portion 263 may be welded to the first surface 251a to ensure connection strength with the tab connection portion 251.

[0153] The second bent portion 263 is positioned against the first surface 251a, thereby increasing the connection area between the support member 26 and the adapter 25, and ensuring good connection stability between the support member 26 and the adapter 25.

[0154] Figure 14 is a partial cross-sectional view of a battery cell after thermal runaway (melting of the insulating material) according to some other embodiments of this application, and Figure 14 is a cross-sectional view of a part of the structure of the battery cell 20 after thermal runaway. In some embodiments of this application, as shown in Figure 14, if the distance between the surface of the bottom wall 261 facing the first wall 213 and the first wall 213 is C3, and the distance between the first surface 251a and the first wall 213 is C2, then the condition 0.5 mm ≤ C3 - C2 ≤ 5 mm is satisfied.

[0155] In the above embodiment, the distance C3 between the surface of the bottom wall 261 facing the first wall 213 and the first wall 213, and the distance C2 between the first surface 251a and the first wall 213 satisfy the above relationship, ensuring that gas flows toward the pressure relief mechanism 22, and making it less likely for the reinforcing portion 2511 to block the relief holes even if it deforms. In addition, since the reinforcing portion 2511 and the support member 26 do not occupy too much of the mounting space, it is ensured that the battery cell 20 has a high energy density. When the battery cell 20 experiences thermal runaway, the reinforcing portion 2511 deforms. If the value obtained by subtracting the distance C2 between the first surface 251a and the first wall 213 from the distance C3 between the surface of the bottom wall 261 facing the first wall 213 and the first wall 213 is less than 0.5 mm, the support member 26 is more likely to obstruct or block the relief holes after the reinforcing portion 2511 deforms, affecting the pressure release by the pressure relief mechanism 22. If the difference between the distance C3 between the surface of the bottom wall 261 facing the first wall 213 and the first wall 213, and the distance C2 between the first surface 251a and the first wall 213, is greater than 5 mm, the mounting space occupied by the reinforcing portion 2511 and the support member 26 in the thickness direction Z will increase, affecting the energy density of the battery cell 20.

[0156] In some embodiments of this application, as shown in Figure 10, the tab connection portion 251 includes a main segment 2512 and a connecting segment 2513, the connecting segment 2513 is connected to the tab 242, and the reinforcing portion 2511 is provided on the main segment 2512.

[0157] The connecting segment 2513 is an area for direct connection to the tab 242. The connecting segment 2513 may be welded to the tab 242 to ensure connection stability between the tab connector 251 and the tab 242. When the connecting segment 2513 is connected to the tab 242 and the reinforcing portion 2511 is provided on the main segment 2512, the reinforcing portion 2511 will not interfere with the connection between the tab connector 251 and the tab 242.

[0158] In some embodiments of this application, as shown in Figure 11, the connecting segment 2513 protrudes from the second surface 251b, and the height of the reinforcing portion 2511 protruding from the second surface 251b is less than or equal to the height of the connecting segment 2513 protruding from the second surface 251b.

[0159] In the above embodiment, by making the height of the reinforcing portion 2511 protruding from the second surface 251b less than or equal to the height of the connecting segment 2513 protruding from the second surface 251b, the space occupied by the reinforcing portion 2511 in the thickness direction Z is reduced, thereby ensuring the strength of the reinforcing portion 2511 and not hindering the connection between the connecting segment 2513 and the tab 242.

[0160] In some embodiments of this application, when the thickness of the reinforcing portion 2511 is W1 and the thickness of the main body segment 2512 is W2, the condition W1 / W2 > 1.1 is satisfied.

[0161] In an embodiment in which the reinforcing portion 2511 is integrally molded with the tab connection portion 251, the reinforcing portion 2511 may be a part of the tab connection portion 251 that has been thickened.

[0162] As shown in Figure 8, in an embodiment in which the reinforcing portion 2511 is provided separately from the tab connecting portion 251, the reinforcing portion 2511 may be in the form of a plate or a sheet, and the material of the main body segment 2512 may be the same as the material of the reinforcing portion 2511. By satisfying the above relationship between the thickness W1 of the reinforcing portion 2511 and the thickness W2 of the main body segment 2512, the reinforcing portion 2511 becomes stronger and less prone to deformation than other parts of the main body segment 2512 where the reinforcing portion 2511 is not provided.

[0163] In an embodiment in which the reinforcing portion 2511 is a projection formed on the first surface 251a, the thickness W1 of the reinforcing portion 2511 may be the height of the reinforcing portion 2511 protruding from the first surface 251a.

[0164] Figure 15 is a cross-sectional view of some components of a battery cell according to some embodiments of the present application. In some embodiments of the present application, as shown in Figures 4 and 15, the battery cell 20 further includes a stopper 27 provided between a first wall 213 and a reinforcing portion 2511, the stopper 27 being configured to contact the first wall 213 and the reinforcing portion 2511 when the battery cell 20 experiences thermal runaway, thereby forming a second exhaust passage 29 between the reinforcing portion 2511 and the first wall 213.

[0165] The stopper 27 is a component used to stop the vehicle.

[0166] When the battery cell 20 experiences thermal runaway, the stopper 27 comes into contact with the first wall 213 and the reinforcing portion 2511, creating a gap between the reinforcing portion 2511 and the first wall 213 in the thickness direction Z of the first wall 213, thereby forming a second exhaust passage 29. As a result, gas flows from this second exhaust passage 29 towards the pressure relief mechanism 22.

[0167] In the above embodiment, when the battery cell 20 experiences thermal runaway, the stopper 27 comes into contact with the first wall 213 and the reinforcing portion 2511, forming a second exhaust passage 29 between the reinforcing portion 2511 and the first wall 213. This makes it easier for gas to flow through the second exhaust passage 29 towards the pressure relief mechanism 22, facilitating pressure release by the pressure relief mechanism 22.

[0168] In some embodiments of this application, as shown in Figures 4 and 15, the battery cell 20 further includes an insulating member 28 located between the first wall 213 and the adapter 25 to insulate and separate the first wall 213 from the adapter 25. Herein, the stopper 27 has a higher melting point than the insulating member 28 and is configured to prevent the adapter 25 from blocking the relief hole after the insulating member 28 has melted.

[0169] The insulating member 28 may be made of a plastic such as PP (polypropylene) or PE (polyethylene).

[0170] Since the melting point of the stopper 27 is higher than that of the insulating member 28, even if the insulating member 28 melts during thermal runaway of the battery cell 20, the stopper 27 supports the reinforcing portion 2511 and the first wall 213, and a second exhaust passage 29 is formed between the reinforcing portion 2511 and the first wall 213, thereby preventing the adapter 25 from blocking the relief hole.

[0171] In the above embodiment, the insulating member 28 insulates and separates the first wall 213 and the adapter 25, thereby avoiding a short circuit between the first wall 213 and the adapter 25. By making the melting point of the stopper 27 higher than that of the insulating member 28, even if the insulating member 28 melts during thermal runaway of the battery cell 20, the stopper 27 will not melt, making it easier to form the second exhaust passage 29 between the reinforcing portion 2511 and the first wall 213.

[0172] Figure 16 is a schematic diagram of the configuration of the first wall according to some embodiments of the present application. In some embodiments of the present application, as shown in Figure 16, the first wall 213 has a third surface 2131 facing the inside of the battery cell 20, and the stopper 27 is fixed to the first wall 213 and protrudes from the third surface 2131.

[0173] The third surface 2131 is the surface of the first wall 213 that faces the inside of the battery cell 20; in other words, the third surface 2131 is the surface of the first wall 213 that is close to the electrode unit 24 in the thickness direction Z.

[0174] There are various ways to fix the stopper 27 to the first wall 213. For example, the stopper 27 may be integrally molded with the first wall 213, or it may be provided separately from the first wall 213 and then integrally fixed. Alternatively, the stopper 27 may be welded to the first wall 213, or it may be fitted into a mounting hole in the first wall 213. The material of the stopper 27 may be the same as the material of the first wall 213 for welding purposes. Alternatively, the material of the stopper 27 may be different from the material of the first wall 213. For example, the material of the first wall 213 may be aluminum, stainless steel, or an aluminum alloy, and the material of the stopper 27 may be ceramic. This provides excellent insulation and strength.

[0175] The fact that the stopper 27 protrudes from the third surface 2131 means that, in the thickness direction Z, the end of the stopper 27 that is away from the first wall 213 is closer to the electrode unit 24 than to the third surface 2131.

[0176] In the above embodiment, since the stopper 27 is fixed to the first wall 213, the strength of the connection between the stopper 27 and the first wall 213 is ensured. Also, since the stopper 27 protrudes from the third surface 2131, it becomes easier to form the second exhaust passage 29 between the reinforcing portion 2511 and the third surface 2131.

[0177] In some embodiments of this application, as shown in Figures 15 and 16, the insulating member 28 includes a fourth surface 281 facing the first wall 213 and a fifth surface 282 away from the first wall 213, and the insulating member 28 is provided with a housing portion 283 for housing the stopper 27, the housing portion 283 having a projection formed on the fifth surface 282 and a groove formed on the fourth surface 281 corresponding to the projection.

[0178] The fourth surface 281 and the fifth surface 282 are two opposing surfaces of the insulating member 28 in the thickness direction of the insulating member 28, and the thickness direction of the insulating member 28 is parallel to the thickness direction Z of the first wall 213.

[0179] The housing portion 283 is a part of the insulating member 28 for housing the stopper 27, and the housing portion 283 is formed by the fourth surface 281 being recessed in the thickness direction Z in a direction away from the first wall 213.

[0180] By providing the housing section 283, an insulating effect is ensured between the first wall 213 and the adapter 25.

[0181] In some embodiments, the housing portion 283 is a through hole. In this case, the material of the stopper 27 is an insulating material, and the stopper 27 is drilled through the through hole. The stopper 27 may be in contact with the reinforcing portion 2511, or there may be a gap between the stopper 27 and the reinforcing portion 2511 in the thickness direction Z.

[0182] In some embodiments of this application, as shown in Figure 15, the adapter 25 includes a tab connector 251, the tab connector 251 having a first surface 251a facing the first wall 213, and when H1 is the distance between the sixth surface 2831 facing the protruding tab connector 251 and the first wall 213, H2 is the distance between the first surface 251a and the first wall 213, and W1 is the thickness of the reinforcing portion 2511 in the thickness direction Z, then H1 + W1 ≤ H2 is satisfied.

[0183] The first surface 251a is the surface of the tab connector 251 that faces the first wall 213. The reinforcing portion 2511 is provided on the first surface 251a side of the tab connector 251 and may be integrally molded with the first surface 251a, or it may be a projection formed on the first surface 251a. Alternatively, the reinforcing portion 2511 may be formed on the edge of the tab connector 251 and may be a first bent portion that bends toward the first surface 251a. Alternatively, the reinforcing portion 2511 may be provided separately from the adapter 25 and welded to the first surface 251a.

[0184] The sixth surface 2831 is a surface that moves away from the first wall 213 of the projection, that is, a surface that moves away from the first wall 213 of the housing portion 283. The distance H1 between the sixth surface 2831 and the first wall 213 is the distance between the surface that moves away from the first wall 213 of the housing portion 283 and the first wall 213.

[0185] The first surface 251a is parallel to the third surface 2131, and the sixth surface 2831 is parallel to the third surface 2131.

[0186] The thickness W1 of the reinforcing portion 2511 in the thickness direction Z is the height of the reinforcing portion 2511 that protrudes from the first surface 251a, that is, the distance between the surface of the reinforcing portion 2511 that is away from the first surface 251a and the first surface 251a. Also, since the thickness direction of the reinforcing portion 2511 is parallel to the thickness direction Z of the first wall 213, the thickness W1 of the reinforcing portion 2511 in the thickness direction Z is the thickness of the reinforcing portion 2511 itself.

[0187] In the above embodiment, the distance H1 between the sixth surface 2831 and the third surface 2131, the distance H2 between the first surface 251a and the third surface 2131, and the thickness W1 of the reinforcing portion 2511 in the thickness direction Z satisfy the above relationship, thereby reducing the space occupied and allowing the stopper 27 to contact the reinforcing portion 2511 to form the second exhaust passage 29 when the battery cell 20 experiences thermal runaway. When H1 + W1 = H2 is satisfied, the housing portion 283 contacts the reinforcing portion 2511. Alternatively, the housing portion 283 may contact the reinforcing portion 2511 to restrict the adapter 25 from moving in the thickness direction Z.

[0188] In some embodiments of this application, the melting point of the stopper 27 is higher than 200°C.

[0189] The melting point of the stopper 27 is higher than 200°C. For example, the material of the stopper 27 may be metal (e.g., iron, copper, aluminum, etc.) or ceramic.

[0190] The melting point of the insulating member 28 may be less than 200°C. In the event of thermal runaway of the battery cell 20, the insulating member 28 melts first, and the stopper 27 is supported between the reinforcing portion 2511 and the first wall 213 after the insulating member 28 has melted. This forms a second exhaust passage 29 between the reinforcing portion 2511 and the first wall 213.

[0191] In the above embodiment, the melting point of the stopper 27 satisfies the above conditions, so the stopper 27 does not melt easily and has an excellent stopping effect.

[0192] In some embodiments of this application, as shown in Figure 16, the stopper 27 includes a first substopper 27a and a second substopper 27b, and the pressure relief mechanism 22 is provided between the first substopper 27a and the second substopper 27b.

[0193] The first substopper 27a and the second substopper 27b are two components of the stopper 27, and the first substopper 27a and the second substopper 27b are provided with a gap between them.

[0194] The pressure relief mechanism 22 is provided between the first sub-stopper 27a and the second sub-stopper 27b, thereby stopping the reinforcing portion 2511 at two points and further ensuring the stopping effect of the stopper 27.

[0195] In some embodiments of this application, in the thickness direction Z, the projection of the reinforcing portion 2511 onto the first wall 213 covers at least a portion of the first substopper 27a and at least a portion of the second substopper 27b.

[0196] The projection of the reinforcing portion 2511 onto the first wall 213 can cover a portion of the first substopper 27a and a portion of the second substopper 27b. Furthermore, the projection of the reinforcing portion 2511 onto the first wall 213 can cover the entirety of the first substopper 27a and the entirety of the second substopper 27b.

[0197] In other words, in the thickness direction Z, the projection of the reinforcing portion 2511 has a large overlapping area with the first substopper 27a and the second substopper 27b.

[0198] The reinforcing portion 2511 has high strength, and when the reinforcing portion 2511 comes into contact with the first substopper 27a and the second substopper 27b, the reinforcing portion 2511 forms a simple beam with the first substopper 27a and the second substopper 27b, reducing the risk of the reinforcing portion 2511 deforming and obstructing or blocking the relief hole.

[0199] In some embodiments of this application, in the thickness direction Z, the projection onto the adapter 25 of the center of the first substopper 27a and the center of the second substopper 27b falls within the reinforcing portion 2511.

[0200] The center of the first substopper 27a and the center of the second substopper 27b are both the geometric centers of the first substopper 27a and the second substopper 27b, respectively.

[0201] The projection of the centers of the first substopper 27a and the second substopper 27b onto the adapter 25 fits within the reinforcing portion 2511, ensuring a large overlapping area between the reinforcing portion 2511 and the first substopper 27a and the second substopper 27b. In the event of thermal runaway of the battery cell, the first substopper 27a and the second substopper 27b effectively stop the reinforcing portion 2511, reducing the risk of the reinforcing portion 2511 deforming and obstructing or blocking the relief hole 221.

[0202] As shown in Figures 5 and 16, the first substopper 27a and the second substopper 27b are spaced apart in the first direction X, and when L1 is the distance between the center line P1 of the first substopper 27a and the center line P2 of the second substopper 27b, and L2 is the size of the reinforcing portion 2511 in the first direction X, L1 ≤ L2 is satisfied.

[0203] In the drawing, the direction indicated by the letter X is the first direction, and the first direction X is perpendicular to the thickness direction Z.

[0204] For example, if the cross-sections of the first substopper 27a and the second substopper 27b are of a regular shape, by making the distance from the center line of the reinforcing portion 2511 to the center line of the first substopper 27a equal to the distance from the center line of the reinforcing portion 2511 to the center line of the second substopper 27b, the forces that the reinforcing portion 2511 receives from the first substopper 27a and the second substopper 27b are ensured to be the same when the battery cell 20 experiences thermal runaway.

[0205] In the above embodiment, the distance L1 between the center line P1 of the first substopper 27a and the center line P2 of the second substopper 27b, and the size L2 of the reinforcing portion 2511 in the first direction X satisfy the above relationship, thus ensuring that the overlapping area of ​​the reinforcing portion 2511 with the first substopper 27a and the second substopper 27b is large. Therefore, in the event of thermal runaway of the battery cell 20, the reinforcing portion 2511 is stretched over the first substopper 27a and the second substopper 27b, and the first substopper 27a and the second substopper 27b firmly hold the reinforcing portion 2511 in place, thereby reducing the risk of the reinforcing portion 2511 deforming and obstructing or blocking the relief holes.

[0206] In some embodiments of this application, the adapter 25 includes an outlet connector 252 and a tab connector 251. The outlet connector 252 is connected to the electrode outlet 23. The tab connector 251 includes a main body segment 2512 and a connecting segment 2513. The connecting segment 2513 is connected to the tab 242, and the reinforcing portion 2511 is provided on the main body segment 2512.

[0207] The reinforcing portion 2511 is provided on the main body segment 2512 so as not to obstruct the connecting segment 2513, and the connecting segment 2513 is connected to the tab 242 to ensure connection stability between the tab connecting portion 251 and the tab 242 and to facilitate current transmission.

[0208] In some embodiments of this application, as shown in Figure 4, the tab 242 is formed at the end of the electrode unit 24 near the first wall 213, and the electrode lead-out portion 23 is provided on the first wall 213.

[0209] The electrode unit 24 includes a main body 241 and a tab 242 extending from the main body 241, the tab 242 extending from the end of the main body 241 closest to the first wall 213.

[0210] By providing the electrode lead-out section 23 on the first wall 213 and reducing the distance between the tab 242 and the first wall 213, the size of the adapter 25 in the thickness direction Z of the first wall 213 is reduced, making it easier to achieve electrical connection between the tab 242 and the electrode lead-out section 23.

[0211] In some embodiments of this application, as shown in Figure 4, the housing 21 includes a housing body 211 and a cover 212. The housing body 211 has an opening, and the electrode unit 24 is installed inside the housing body 211. The cover 212 covers the opening to form a sealed space. The cover 212 is a first wall 213, and the electrode lead-out portion 23 is provided on the cover 212.

[0212] The pressure relief mechanism 22 and the electrode lead-out section 23 are both provided on the cover 212. When the tab 242 is formed at the end of the electrode unit 24 closest to the cover 212, the configuration of the battery cell 20 becomes more compact, and the mounting space can be used more efficiently.

[0213] In some embodiments, the first wall 213 may be a wall of the housing body 211.

[0214] In some embodiments of this application, as shown in Figures 4, 5, 7, and 10, the adapter 25 further includes an intermediate connection portion 253 connecting a tab connection portion 251 and an extension connection portion 252. To reduce the mounting space occupied by the adapter 25, the intermediate connection portion 253 is bent relative to the tab connection portion 251 and also bent relative to the extension connection portion 252 to form a Z shape.

[0215] In the thickness direction Z, the projection of the drawer connection portion 252 onto the first wall 213 and the projection of the intermediate connection portion 253 onto the first wall 213 do not overlap with the pressure relief mechanism 22. The reinforcing portion 2511 is located at the end of the tab connection portion 251 that is away from the connection point between the tab connection portion 251 and the intermediate connection portion 253.

[0216] Some embodiments of this application further provide a battery, which comprises a housing and a plurality of battery cells 20 according to the above embodiments, wherein the plurality of battery cells 20 are installed within the housing.

[0217] Some embodiments of this application further provide electrical devices, the electrical devices comprising a battery cell 20 according to the above embodiments, the battery cell 20 supplying power to the electrical devices.

[0218] The electrical equipment may be an equipment or system to which any of the above-mentioned battery cells 20 are applied.

[0219] Some embodiments of this application provide a cylindrical battery cell as shown in Figures 3, 4, and 15. The cylindrical battery cell includes a housing 21, a pressure relief mechanism 22, an electrode lead-out section 23, an electrode unit 24, an adapter 25, and a stopper 27. The housing 21 includes a housing body 211 and a cover 212. The housing body 211 has an opening, and the cover 212 covers the opening so as to form a sealed space. The cover 212 is a first wall 213. The pressure relief mechanism 22 is provided in the first wall 213, and the electrode lead-out section 23 is provided in the first wall 213. The electrode unit 24 is installed inside the housing body 211. The electrode unit 24 includes a tab 242 formed at the end of the electrode unit 24 closest to the first wall 213. The adapter 25 includes a tab connector 251, an outlet connector 252, and a relay connector 253. The relay connector 253 connects the tab connector 251 and the outlet connector 252, the tab connector 251 is connected to the tab 242, and the outlet connector 252 is connected to the electrode outlet 23. The tab connector 251 is provided with a reinforcing portion 2511, and the projection of the reinforcing portion 2511 onto the first wall 213 in the thickness direction Z of the first wall 213 completely covers the pressure relief mechanism 22. The reinforcing portion 2511 is a first bent portion connected to the edge of the tab connecting portion 251, and the tab connecting portion 251 has a first surface 251a facing the first wall 213 and a second surface 251b away from the first wall 213, and the first bent portion is bent toward the first surface 251a and comes into contact with the first surface 251a. The stopper 27 is provided between the first wall 213 and the reinforcing portion 2511 and is configured to come into contact with the first wall 213 and the reinforcing portion 2511 when the battery cell 20 experiences thermal runaway, thereby forming a second exhaust passage 29 between the reinforcing portion 2511 and the first wall 213.

[0220] In such a cylindrical battery cell, the reinforcing portion 2511 improves the strength of the tab connection portion 251, and the stopper 27 is provided between the first wall 213 and the reinforcing portion 2511. Therefore, when the battery cell 20 experiences thermal runaway, a second exhaust passage 29 is formed between the reinforcing portion 2511 and the first wall 213, reducing the risk of the reinforcing portion 2511 obstructing or blocking the relief hole, and facilitating pressure release by the pressure relief mechanism 22, thus providing the cylindrical battery cell with high safety.

[0221] While this application has been described with reference to preferred embodiments, various improvements may be made thereto, and components may be replaced with equivalent ones, without departing from the scope of this application. In particular, the technical features mentioned in each embodiment may be combined in any manner, provided that no structural inconsistencies exist. This application is not limited to the specific embodiments disclosed herein, but encompasses all technical ideas within the claims. [Explanation of symbols]

[0222] 100 batteries 10 cabinets 11 Part 1 12 Part 2 20 battery cells 21 Housing 211 Housing body 212 Lid 213 The First Wall 2131 Third surface 22 Pressure relief mechanism 221 Escape hole 23 Electrode extraction part 24 Electrode Units 241 Main body 242 tabs 25 adapters 251 Tab connection section 251a 1st surface 251b 2nd surface 2511 Reinforcement section 2511a Protrusion 2511b Groove 2512 Main Segment 2513 Connection Segment 2514 First exhaust passage 252 Drawer connection section 253 Relay connection section 26 Support member 261 Bottom wall 262 Side wall 263 Second folding section 27 Stopper 27a First Substopper 27b Second Substopper 28 Insulating material 281 4th surface 282 5th surface 283 Storage Unit 2831 6th surface 29. Second exhaust passage 200 controllers 300 motor 1000 vehicles

Claims

1. A housing having a first wall, The pressure relief mechanism provided in the first wall, An electrode extraction portion provided in the housing, An electrode unit provided within the housing and having a tab, An adapter connecting the electrode extraction section and the tab, Includes, The adapter is provided with a reinforcing portion, and the projection of the reinforcing portion onto the first wall in the thickness direction of the first wall covers at least a part of the pressure relief mechanism. The battery cell wherein the adapter includes a tab connection portion for connecting to the tab and an electrode lead portion for connecting to the electrode lead portion, the tab connection portion and the lead portion connection portion are located at opposite ends of the adapter, and the reinforcing portion is provided on the tab connection portion.

2. The reinforcing portion is the first bent portion of the tab connection portion, The tab connection portion has a first surface facing the first wall and a second surface away from the first wall, and the first bend portion is bent toward either the first surface or the second surface. The battery cell according to claim 1.

3. The battery cell according to claim 2, wherein the first bent portion is applied to the first surface or the second surface.

4. The tab connection portion has a first surface facing the first wall and a second surface away from the first wall, and a projection is formed on the first surface, the projection being the reinforcing portion. The battery cell according to claim 1.

5. The battery cell according to claim 4, wherein grooves are formed on the second surface at positions corresponding to the protrusions.

6. The tab connection portion has a first surface facing the first wall and a second surface away from the first wall. The reinforcing portion has protrusions formed on the second surface and grooves formed on the first surface at positions corresponding to the protrusions. The battery cell according to claim 1.

7. The projection of the groove onto the first wall covers at least a portion of the pressure relief mechanism in the battery cell according to claim 6.

8. The battery cell according to claim 6 or 7, wherein the groove extends to the edge of the tab connection portion.

9. The battery cell according to claim 6 or 7, wherein a first exhaust passage is provided in the groove wall of the groove, which connects the inside and outside of the groove.

10. In the thickness direction, if the distance between the bottom surface of the groove and the first wall is C1, and the distance between the first surface and the first wall is C2, then C1 and C2 satisfy 0.5 mm ≤ C1 - C2 ≤ 5 mm. The battery cell according to claim 6 or 7.

11. The battery cell according to claim 10, wherein C1 and C2 satisfy 1 mm ≤ C1 - C2 ≤ 3 mm.

12. It further includes a support member including a bottom wall and side walls, The bottom wall is positioned against the bottom surface of the groove, and the side wall is formed on the edge of the bottom wall and is positioned against the side surface of the groove. The battery cell according to claim 6 or 7.

13. The support member further includes a second bent portion, The second bent portion is connected to the side wall, located outside the groove, and is positioned against the first surface. The battery cell according to claim 12.

14. The tab connection section includes a main body segment and a connection segment. The connecting segment is connected to the tab, and the reinforcing portion is provided on the main body segment. The battery cell according to claim 6 or 7.

15. The connecting segment protrudes from the second surface, and the height of the reinforcing portion protruding from the second surface is less than or equal to the height of the connecting segment protruding from the second surface. The battery cell according to claim 14.

16. The invention further includes a stopper provided between the first wall and the reinforcing portion, The stopper is configured to contact the first wall and the reinforcing portion when the battery cell experiences thermal runaway, thereby forming a second exhaust passage between the reinforcing portion and the first wall. A battery cell according to any one of claims 1 to 7.

17. To insulate and separate the first wall from the adapter, the system further includes an insulating member located between the first wall and the adapter. The stopper has a melting point higher than the melting point of the insulating member. The stopper is configured to prevent the adapter from obstructing the pressure relief mechanism after the insulating member has melted. The battery cell according to claim 16.

18. The first wall has a third surface facing the interior of the battery cell, and the stopper is fixed to the first wall and protrudes from the third surface. The battery cell according to claim 17.

19. The insulating member includes a fourth surface facing the first wall and a fifth surface away from the first wall. The insulating member is provided with a housing portion for housing the stopper, and the housing portion has a projection formed on the fifth surface and a groove corresponding to the projection formed on the fourth surface. The battery cell according to claim 17.

20. The adapter includes a tab connection portion that connects to the tab, The tab connection portion has a first surface facing the first wall, If H1 is the distance between the sixth surface of the projection facing the tab connection portion and the first wall, H2 is the distance between the first surface and the first wall, and W1 is the thickness of the reinforcing portion in the thickness direction, then H1, W1, and H2 satisfy H1 + W1 ≤ H2. The battery cell according to claim 19.

21. The battery cell according to claim 17, wherein the melting point of the stopper is higher than 200°C.

22. The stopper includes a first substopper and a second substopper, and the pressure relief mechanism is provided between the first substopper and the second substopper. The battery cell according to claim 17.

23. In the thickness direction, the projection of the reinforcing portion onto the first wall covers at least a portion of the first substopper and at least a portion of the second substopper. The battery cell according to claim 22.

24. In the thickness direction, the projection of the center of the first substopper and the center of the second substopper onto the adapter falls within the reinforcing portion. The battery cell according to claim 23.

25. The tab is formed at the end of the electrode unit near the first wall, and the electrode lead-out portion is provided on the first wall. A battery cell according to any one of claims 1 to 7.

26. A battery comprising a housing and a plurality of battery cells as described in any one of claims 1 to 7, wherein the plurality of battery cells are installed inside the housing.

27. An electrical device comprising a battery cell according to any one of claims 1 to 7.

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