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

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automotive industry. Electric vehicles have the advantages of energy conservation and environmental protection, and are an important part of the sustainable development of the automotive industry. Battery technology is also a key factor in the development of electric vehicles.

[0003] In the development of battery technology, not only is it necessary to improve the energy density of batteries, but safety cannot be ignored either. Therefore, how to improve the safety of batteries has become a technical issue that must be resolved as soon as possible. Summary of the Invention

[0004] The present application aims to provide a battery cell, a battery, and an electric device. The battery cell has a high level of safety.

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

[0006] In a first aspect, the present application provides a battery cell, the battery cell including a housing having a first wall, a pressure relief mechanism provided in the first wall, an electrode lead portion provided in the housing, an electrode unit provided in the housing and including a tab, and an adapter connecting the electrode lead portion and the tab, the adapter being provided with a reinforcing portion, and a projection of the reinforcing portion onto the first wall in a thickness direction of the first wall covers at least a portion of the pressure relief mechanism.

[0007] According to the battery cell according to the embodiment of the present application, the adapter is provided with a reinforcing portion that improves 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, if thermal runaway occurs in the battery cell, the adapter is less likely to deform and the risk of the adapter blocking the relief hole of the battery cell can be reduced, ensuring pressure relief for the battery cell and making the battery cell highly safe.

[0008] In some embodiments of the present application, the adapter includes a tab connection portion that connects with the tab, and the reinforcement portion is provided at the tab connection portion.

[0009] In the above aspect, the reinforcing 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 the present 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 aspect, the reinforcing portion is the first bent portion, and the first bent portion is bent toward the first surface side or the second surface side, which facilitates molding.

[0012] In some embodiments of the present application, the first fold is applied to the first surface or the second surface.

[0013] In the above aspect, the first folded portion is applied to the first surface or the second surface, thereby reducing the risk of the first folded portion floating up and making the reinforcing portion less likely to deform.

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

[0015] In some embodiments of the present application, grooves are formed in the second surface at locations corresponding to the protrusions.

[0016] In the above aspect, by forming a groove corresponding to the protrusion on either the first surface or the second surface, the molding process of the reinforcing portion can be facilitated and the weight of the adapter can be reduced.

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

[0018] In the above aspect, the reinforcing portion has a protrusion formed on the second surface and a groove formed on the first surface, thereby improving the strength of the adapter and making the adapter less likely to deform toward the first wall.

[0019] In some embodiments of the present 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 portion of the pressure relief mechanism, making it difficult for the reinforcing portion to deform and block or obstruct the relief hole, thereby ensuring pressure relief for the battery cell.

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

[0022] In the above aspect, the groove extends to the edge of the adapter, forming a passage for gas flow at the position of the reinforcement portion, allowing gas to flow through the reinforcement portion toward the pressure relief mechanism, making it easier for the pressure relief mechanism to release pressure.

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

[0024] In the above aspect, a first exhaust passage that connects the inside and outside of the groove is provided in the groove wall of the groove, making it easier for gas to enter the groove and flow toward the pressure relief mechanism, ensuring a smooth flow of gas and making it easier for pressure to be released by the pressure relief mechanism.

[0025] In some embodiments of the present application, when the distance in the thickness direction 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, the relationship 0.5 mm≦C1-C2≦5 mm is satisfied.

[0026] In the above embodiment, 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, which ensures that the gas flows toward the pressure relief mechanism and that the relief hole is less likely to be blocked even if the reinforcement part is deformed. It also ensures that the reinforcement part does not occupy too much of the mounting space, and ensures 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 embodiment, 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, which further ensures that gas flows smoothly toward the pressure relief mechanism compared to the case where 0.5 mm≦C1-C2≦5 mm, and ensures the energy density of the battery cell by rationally utilizing the installation 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 being applied to a bottom surface of the groove, and the side wall being formed on an edge of the bottom wall and applied to a side surface of the groove.

[0030] In the above aspect, the support member is provided within 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 reinforcement portion, reducing the risk of the pressure relief mechanism being obstructed and blocked, and ensuring pressure relief by the pressure relief mechanism.

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

[0032] In the above aspect, the second bent portion is applied to the first surface, thereby ensuring a large connection area between the support member and the adapter, and ensuring good connection stability between the support member and the adapter.

[0033] In some embodiments of the present application, the tab connection includes a body segment and a connecting segment, the connecting segment being connected to the tab, and the reinforcement portion being disposed on the body segment.

[0034] In the above aspect, the connection segment is connected to the tab, and the reinforcing portion is provided on the main body segment, so that the reinforcing portion does not interfere with the connection between the tab connection portion and the tab.

[0035] In some embodiments of the present application, the connection segments protrude from the second surface, and a height of the reinforcement portion protruding from the second surface is less than or equal to a height of the connection segments protruding from the second surface.

[0036] In the above aspect, by making the height of the reinforcement portion protruding from the second surface less than the height of the connection segment protruding from the second surface, the space occupied by the reinforcement portion in the thickness direction is reduced, ensuring the strength of the reinforcement portion while not interfering with the connection between the connection segment and the tab.

[0037] In some embodiments of the present application, the battery cell further includes a stopper provided between the first wall and the reinforcing portion, and the stopper is configured to abut against the first wall and the reinforcing portion during thermal runaway of the battery cell to form a second exhaust passage between the reinforcing portion and the first wall.

[0038] In the above-described aspect, when thermal runaway occurs in the battery cell, the stopper abuts against the first wall and the reinforcing portion to form a second exhaust passage between the reinforcing portion and the first wall, making it easier for gas to flow through the second exhaust passage toward the pressure relief mechanism, making it easier for the pressure relief mechanism to release pressure.

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

[0040] In the above aspect, the insulating member insulates and separates the first wall and the adapter, thereby preventing a short circuit between the first wall and the adapter, and by making the melting point of the stopper higher than the melting point of the insulating member, the stopper does not melt even if the insulating member melts during thermal runaway of the battery cell, thereby forming a second exhaust passage between the reinforcement portion and the first wall.

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

[0042] In the above aspect, 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 protrudes from the third surface, making it easier to form a second exhaust passage between the reinforcement portion and the third surface.

[0043] In some embodiments of the present 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 an accommodating portion for accommodating the stopper, the accommodating portion having a protrusion formed on the fifth surface and a groove corresponding to the protrusion formed on the fourth surface.

[0044] In the above aspect, the housing portion is provided to ensure the insulating effect between the first wall and the adapter.

[0045] In some embodiments of the present application, the adapter includes a tab connection portion that connects to the tab, the tab connection portion having a first surface facing the first wall, and where H1 is a distance between a sixth surface of the protrusion facing the tab connection portion and the first wall, H2 is a distance between the first surface and the first wall, and W1 is a thickness of the reinforcing portion in the thickness direction, H1+W1≦H2 is satisfied.

[0046] In the above aspect, the distance H1 between the sixth surface and the third surface in the thickness direction, the distance H2 between the first surface and the third surface, and the thickness W1 of the reinforcement portion satisfy the above relationship, thereby reducing the space occupied and enabling the stopper to abut against the reinforcement portion to form a second exhaust passage in the event of thermal runaway of the battery cell.

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

[0048] In the above embodiment, the melting point of the stopper satisfies the above condition, so that the stopper does not melt easily and an excellent stopping effect is ensured.

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

[0050] In the above aspect, the pressure relief mechanism is provided between the first sub-stopper and the second sub-stopper, thereby stopping the reinforcing portion at two locations and further ensuring the stopping effect of the stopper.

[0051] In some embodiments of the present application, in the thickness direction, a projection of the reinforcing portion onto the first wall covers at least a part of the first sub-stopper and at least a part of the second sub-stopper.

[0052] In the above aspect, the projection of the reinforcing portion covers at least a part of the first sub-stopper and at least a part of the second sub-stopper, thereby forming a simple beam and reducing the risk of deformation of the reinforcing portion.

[0053] In some embodiments of the present application, a projection of a center of the first sub-stopper and a center of the second sub-stopper onto the adapter in the thickness direction falls within the reinforcing portion.

[0054] In the above-described embodiment, the projection of the center of the first sub-stopper and the center of the second sub-stopper onto the adapter fits within the reinforcement portion, thereby ensuring a large overlapping area between the first sub-stopper and the second sub-stopper of the reinforcement portion. In the event of thermal runaway of the battery cell, the first sub-stopper and the second sub-stopper effectively stop the reinforcement portion, thereby reducing the risk of the reinforcement portion deforming and blocking or blocking the escape hole.

[0055] In some embodiments of the present application, the tab is formed at an end of the electrode unit close to the first wall, and the electrode lead portion is provided on the first wall.

[0056] In the above aspect, by providing the electrode lead-out portion on the first wall and 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 aspect, the present application provides a battery, the battery including a housing and a plurality of battery cells according to the above embodiments, the plurality of battery cells being disposed within the housing.

[0058] In a third aspect, the present application provides an electric device, the electric device including a battery cell according to the above embodiment.

[0059] Other aspects and advantages of the present application will be set forth in part in the description which follows, and in part will be obvious based on the following, or may be learned by the practice of the present application. [Brief description of the drawings]

[0060] In order to more clearly describe the technical solutions of the embodiments in this application, the drawings necessary for describing the embodiments are briefly described below. The drawings described only show some embodiments of this application. Those skilled in the art can obtain other drawings based on these drawings without using inventive abilities. The drawings are not drawn to scale. [Figure 1] FIG. 1 is a schematic diagram of a vehicle according to some embodiments of the present application. [Diagram 2] FIG. 2 is an exploded view of a battery according to some embodiments of the present application. [Diagram 3] FIG. 2 is an exploded view of a battery cell according to some embodiments of the present application. [Figure 4] FIG. 2 is a schematic diagram of some components of a battery cell according to some embodiments of the present application. [Diagram 5] 1A-1C are schematic diagrams of an adapter in a deployed state according to some embodiments of the present application. [Figure 6] FIG. 2 is a plan view of a battery cell according to some embodiments of the present application. [Figure 7] 13A-13C are schematic diagrams of an adapter in an expanded state according to some other embodiments of the present application. [Figure 8] 2A to 2C are schematic diagrams illustrating the configuration of a reinforcing part according to some embodiments of the present application. [Figure 9] 5A to 5C are schematic diagrams illustrating the configuration of a reinforcing portion according to some other embodiments of the present application. [Figure 10] 11A to 11C are schematic diagrams illustrating the configuration of a reinforcing portion according to still other embodiments of the present application. [Figure 11] FIG. 11 is a partial enlarged view of part A in FIG. [Figure 12] 2 is a schematic diagram of a first exhaust passage according to some embodiments of the present application. [Figure 13] 1 is a cross-sectional view of some components of a battery cell according to some embodiments of the present application. [Figure 14] FIG. 2 is a partial cross-sectional view of a battery cell after thermal runaway (insulating member melted) according to some embodiments of the present application. [Figure 15] 1 is a cross-sectional view of some components of a battery cell according to some embodiments of the present application. [Figure 16] FIG. 2 is a schematic diagram of a first wall configuration according to some embodiments of the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0061] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be described below with reference to the drawings of the embodiments of the present application. The described embodiments are only some of the embodiments of the present application, and of course are not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without using inventive ability also belong to the protection scope of the present application.

[0062] Unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by a person of ordinary skill in the art to which this application belongs. In this application, the terms used in the specification are merely for the purpose of specifically describing the embodiments, and are not intended to limit the present application. In addition, the terms "include", "have" and similar terms in the specification, claims and drawings of this application are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the specification, claims and drawings of this application are merely intended to distinguish similar objects, and are not intended to limit a specific order or sequence.

[0063] The term "an embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of the term in various parts of the specification are not all referring to the same embodiment, nor are they separate or alternative embodiments exclusive of one another.

[0064] In the description of this application, unless otherwise clearly defined or limited, the terms "attached", "coupled", "connected", "fixed" and the like should be understood in a broad sense. For example, they may be fixedly connected, detachably connected, or integrally connected. They may also be directly connected, indirectly connected via an intermediate object, or the interiors of two elements may communicate with each other or the two elements may interact with each other. Those skilled in the art can understand the specific meanings of the above terms in this application according to the specific circumstances.

[0065] In the embodiments of the present application, like reference numerals denote like parts, and for the sake of simplicity, detailed descriptions of the same parts between different embodiments will be omitted. In addition, it is understood that the dimensions such as thickness, length, width, etc. of each part of the embodiments of the present application and the overall dimensions such as thickness, length, width, etc. of the integrated device shown in the drawings are merely illustrative and do not limit the present application.

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

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

[0068] The battery described in the embodiments of the present application is a single physical module that includes one or more battery cells to provide higher voltage and capacity. The battery usually includes a housing for enclosing one or more battery cells. The housing can prevent liquids and other foreign objects from affecting the charging and discharging of the battery cells.

[0069] The battery cell includes an electrode unit and an electrolyte, and the electrode unit is composed of a positive electrode plate, a negative electrode plate and a separator. The battery cell mainly operates by the movement of metal ions between the positive electrode plate and the negative electrode plate. The positive electrode plate includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is applied to the surface of the positive electrode collector. The positive electrode collector without the positive electrode active material layer protrudes from the positive electrode collector with the positive electrode active material layer applied thereto and is used as a positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive electrode collector is aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganate, etc. The negative electrode plate includes a negative electrode collector and a negative electrode active material layer. The negative electrode active material layer is applied to the surface of the negative electrode collector. The negative electrode current collector on which the negative electrode active material layer is not applied protrudes from the negative electrode current collector on which the negative electrode active material layer is applied and is used as a negative electrode tab. The material of the negative electrode current collector is copper, and the negative electrode active material can be carbon, silicon, etc. In order to ensure that the negative electrode current collector 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 material of the separator can be PP (polypropylene), PE (polyethylene), etc.

[0070] The battery cell further includes an electrode lead-out portion and an adapter, the electrode lead-out portion drawing out electrical energy from the battery cell, and the adapter connecting the electrode lead-out portion and the tab.

[0071] As battery technology develops, many design factors must be considered, such as performance parameters such as energy density, cycle life, discharge capacity, C-rate, etc. In addition, battery safety must also be considered.

[0072] The pressure relief mechanism refers to an element or member that operates in the battery cell to release the internal pressure or heat. The operation of the pressure relief mechanism is performed when the internal pressure or temperature of the battery cell reaches a preset threshold, or may be controlled to open by measuring or adjusting a measuring device. The pressure relief mechanism may be an explosion-proof valve, an air valve, a pressure relief valve, a safety valve, etc. Furthermore, a pressure-sensitive element or a temperature-sensitive element, or a pressure-sensitive structure or a temperature-sensitive structure, or a notch may be formed on the case of the battery cell. That is, when the internal pressure or temperature of the battery cell reaches a preset threshold, the pressure relief mechanism is configured to operate or to break a fragile structure provided in the pressure relief mechanism to form a relief hole for releasing the internal pressure or heat.

[0073] "Activation" as referred to in this application refers to the pressure relief mechanism operating or being activated to release the internal pressure and heat of the battery cell until a certain condition is reached. The operation of the pressure relief mechanism includes, but is not limited to, rupturing, crushing, breaking, opening, etc., at least a portion of the pressure relief mechanism. This allows the pressure and heat of the battery cell to be released within a pressure or temperature controllable range, and prevents the occurrence of a potentially more serious accident.

[0074] The pressure relief mechanism of a battery cell is important for the safety of the battery. For example, if a short circuit or overcharging occurs, thermal runaway may occur inside the battery cell, causing the pressure and temperature to rise. In this case, the pressure relief mechanism can be activated to release the internal pressure and heat, preventing the battery cell from exploding or catching fire.

[0075] In the prior art, even if a pressure relief mechanism is provided in the battery cell, the battery cell may explode or catch fire. As a result of research by the inventors, the cause of the above problem is that when thermal runaway occurs in the battery cell, the pressure relief mechanism is activated to form a relief hole for exhaust, but the insulating material for insulating and isolating the housing and the adapter melts, and the adapter deforms during exhaust, blocking or blocking the relief hole, so that the internal pressure of the battery cell cannot be released or the release speed is significantly reduced, resulting in the battery cell exploding or catching fire.

[0076] In light of this, and in order to solve the problem of the adapter deforming and blocking the pressure relief mechanism when the battery cell experiences thermal runaway, thereby compromising the safety of the battery cell, the inventors conducted extensive research and developed a battery cell in which a reinforcing part is provided in the adapter. This reinforcing part improves the strength of the adapter and makes it less likely to deform when the battery cell experiences thermal runaway, thereby reducing the risk of the adapter blocking the pressure relief mechanism and resulting in a high level of safety for the battery cell.

[0077] In such a battery cell, the projection of the reinforcing portion covers at least a portion of the pressure relief mechanism, so that in the event of thermal runaway in the battery cell, the pressure relief mechanism is activated to release the internal pressure, causing the gas inside the battery cell to flow toward the pressure relief mechanism. Because the reinforcing portion improves the strength of the adapter, the adapter is less likely to deform even when airflow acts on the adapter, and the reinforcing portion is also less likely to deform, reducing the risk of blocking or blocking the relief hole, 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 the present application can be applied to, but are not limited to, electric devices such as vehicles, ships, and aircraft, and the power supply system of the electric devices may be configured using the battery cells and batteries disclosed in the present application.

[0079] The embodiment of the present application provides an electric device powered by a battery. The electric device may be, but is not limited to, a vehicle, a mobile phone, a portable device, a laptop, a ship, an aircraft, an electric toy, and an electric tool. The vehicle includes a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle, and the new energy vehicle includes an electric vehicle, a hybrid vehicle, or a range-extender electric vehicle. The aircraft includes an airplane, a rocket, a space shuttle, and a spaceship. The electric toys include stationary or mobile ones, such as a game machine, an electric car toy, an electric ship toy, and an electric airplane toy. The electric tools include metal cutting electric tools, polishing electric tools, assembly electric tools, and railway electric tools, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator, and an electric planer. The embodiment of the present application is not particularly limited to the above electric devices.

[0080] In the following embodiment, for convenience of explanation, a case where the electrical device is a vehicle will be described as an example.

[0081] Fig. 1 is a schematic diagram of a vehicle according to some embodiments of the present application. As shown in Fig. 1, a battery 100 is disposed inside a vehicle 1000. The battery 100 can be disposed at the bottom, front, or rear of the vehicle 1000. The battery 100 is for supplying power to the vehicle 1000, and can be, for example, an operating power source for the vehicle 1000.

[0082] The vehicle 1000 further includes a controller 200 and a motor 300. The controller 200 is for controlling the battery 100 to power the motor 300, for example, controlling the battery 100 to supply power required for starting, navigating, and running the vehicle 1000.

[0083] In some embodiments of the present 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 for the vehicle 1000 in place of gasoline or natural gas.

[0084] 2 is an exploded view of a battery according to some embodiments of the present application. As shown in FIG. 2, the battery 100 includes a housing 10 and a battery cell 20, and the battery cell 20 is disposed in the housing 10.

[0085] Here, the housing 10 is a component that houses the battery cells 20 and provides a storage space for the battery cells 20, and may be configured with a plurality of structures. In some embodiments, the housing 10 includes a first portion 11 and a second portion 12, and when the first portion 11 and the second portion 12 are combined, a storage space for storing the battery cells 20 is formed. The first portion 11 and the second portion 12 may be formed in various shapes, such as a rectangular parallelepiped or a cylindrical body. The first portion 11 may have a hollow structure with one side open, and the second portion 12 may also have a hollow structure with one side open, and the combination of the open side of the second portion 12 and the open side of the first portion 11 forms the housing 10 having the storage space. In addition, the first portion 11 may have a hollow structure with one side open, and the second portion 12 may have a plate-shaped structure, and the second portion 12 covers the open side of the first portion 11 to form the housing 10 having the storage space. The first portion 11 and the second portion 12 may be sealed by a sealing member such as a seal ring or a 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 means that the plurality of battery cells 20 are connected in series and then 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 the plurality of battery modules may be connected in series, in parallel, or in series-parallel to be housed as an integrated unit in the housing 10. Alternatively, all the battery cells 20 may be connected directly in series, in parallel, or in series-parallel, and the entire unit made up of all the battery cells 20 may be housed in the housing 10.

[0087] In some embodiments, the battery 100 may further include a bus bar. The multiple battery cells 20 may be electrically connected through the bus bar, thereby realizing a series connection, a parallel connection, or a series-parallel connection of the multiple battery cells 20. The bus bar may be a metal conductor, such as copper, iron, aluminum, stainless steel, an aluminum alloy, or the like.

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

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

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

[0091] The lid 212 is a component that closes the opening of the housing body 211 to separate the internal environment of the battery cell 20 from the external environment. The lid 212 and the housing body 211 form a sealed space for accommodating the electrode unit 24, the electrolyte, and other components. The lid 212 may be connected to the housing body 211 by welding or seaming so as to close the opening of the housing body 211. The shape of the lid 212 corresponds to the shape of the housing 21. For example, the housing body 211 may have a rectangular parallelepiped structure, and the lid 212 may have a rectangular plate-like structure corresponding to the housing 21. The housing body 211 may have a cylindrical structure, and the lid 212 may have a disk-like structure corresponding to the housing body 211. The material of the lid 212 may be various, and may be, for example, copper, iron, aluminum, steel, aluminum alloy, etc.

[0092] The battery cell 20 may include one or two lids 212. In an embodiment in which the housing body 211 has a hollow structure with openings formed at both ends, two lids 212 are provided. The two lids 212 close the two openings of the housing body 211, respectively, and the two lids 212 and the housing body 211 form a sealed space. In an embodiment in which the housing body 211 has a hollow structure with an opening formed at one end, one lid 212 is provided. The lid 212 closes the opening at one end of the housing body 211, and the one lid 212 and the housing body 211 form a sealed space.

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

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

[0095] The electrode lead-out portion 23 is a component that draws out 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 Fig. 3, the electrode lead-out portion 23 is provided on the cover body 212. In other embodiments, the electrode lead-out portion 23 may be provided on the housing main body 211. The electrode lead-out portion 23 may be an electrode terminal attached to the first wall 213, or may be a part of the housing 21.

[0096] The adapter 25 is a component that realizes an electrical connection between the electrode lead portion 23 and the tab 242 .

[0097] FIG. 4 is a schematic diagram of the configuration of some components of a battery cell according to some embodiments of the present application, FIG. 5 is a schematic diagram of an adapter according to some embodiments of the present application in an expanded state, and FIG. 6 is a plan view of a battery cell according to some embodiments of the present application. Also, FIG. 6 is a schematic diagram showing a projection of a pressure relief mechanism and a tab connection part along the thickness direction of a first wall. As shown in FIG. 3 to FIG. 6, some embodiments of the present application provide a battery cell 20. The battery cell 20 includes a housing 21, a pressure relief mechanism 22, an electrode lead-out part 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 on the first wall 213. The electrode lead-out part 23 is provided in the housing 21. The electrode unit 24 is provided in the housing 21 and includes a tab 242. The adapter 25 connects the electrode lead-out part 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 drawings, 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 portion 241 and a tab 242 extending from the main body portion 241. The tab 242 may extend from both sides of the main body portion 241, or may extend from one side of the main body portion 241.

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

[0101] The adapter 25 is a component for realizing an electrical connection between the electrode lead portion 23 and the tab 242 .

[0102] The reinforcing portion 2511 is a structure for improving the strength of the adapter 25 so that the adapter 25 is less likely to deform. For example, the reinforcing portion 2511 is provided in 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., air current) is applied.

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

[0104] In some embodiments, the reinforcement portion 2511 is an annular structure, which provides increased strength to the area surrounded by the contour of the annular structure, the projection of which on the first wall 213 covers at least a portion of the pressure relief mechanism 22.

[0105] According to the battery cell 20 according to the embodiment of the present application, when thermal runaway occurs in the battery cell 20, the pressure relief mechanism 22 is activated to form a relief hole 221 that communicates between the inside and outside of the battery cell 20 (see FIG. 14). The adapter 25 is provided with a reinforcing portion 2511 that improves 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, making the portion of the adapter 25 that corresponds to the pressure relief mechanism 22 less likely to deform, reducing the risk that the adapter 25 will block or block the relief hole, ensuring pressure relief in the battery cell 20, and making the battery cell 20 highly safe.

[0106] In some embodiments of the present application, the adapter 25 includes a tab connection portion 251 that connects with the tab 242 , and a reinforcement portion 2511 is provided at the tab connection portion 251 .

[0107] The adapter 25 further includes a lead-out portion connection portion 252 that connects to the electrode lead-out portion 23, and the tab connection portion 251 and the lead-out portion connection portion 252 may be located at opposite ends of the adapter 25. A reinforcing portion 2511 is provided in the tab connection portion 251, so that even if an external force (e.g., airflow) is applied, the position or region of the tab connection portion 251 where the reinforcing portion 2511 is provided is less likely to deform. When thermal runaway occurs in the battery cell 20, the tab connection portion 251 also deforms due to the deformation of the tab 242 and moves closer to the first wall 213. Therefore, by providing the reinforcing portion 2511 in the tab connection portion 251, the tab connection portion 251 is less likely to deform. In addition, 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 draw-out portion connection portion 252 generally has a small area and its projection onto the first wall 213 does not cover the pressure relief mechanism 22, so a reinforcing portion 2511 is provided in the tab connection portion 251.

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

[0109] The reinforcing portion 2511 may 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 towards the first surface 251a, in other words, the reinforcing portion 2511 is formed by folding the tab connection portion 251 towards the first surface 251a. The first bent portion is bent towards the second surface 251b, in other words, the reinforcing portion 2511 is formed by folding the tab connection portion 251 towards the second surface 251b.

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

[0113] In some embodiments, the reinforcement portion 2511 is connected to an edge of the tab connection portion 251 to facilitate folding.

[0114] In some embodiments of the present application, the first fold is directed to the first surface 251a or the second surface 251b.

[0115] The first bent portion is applied to the first surface 251a, so that the contact area between the first bent portion and the first surface 251a is increased. When thermal runaway occurs in the battery cell 20 and an 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. This makes it difficult for the area of ​​the first bent portion covering the first surface 251a to deform, reducing the risk that the tab connection portion 251 will block or block the relief hole.

[0116] By having the first bent portion facing the second surface 251b, the contact area between the first bent portion and the second surface 251b is increased. When thermal runaway occurs in the battery cell 20 and an 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 it difficult for the area of ​​the first bent portion covering the second surface 251b to deform, reducing the risk that the tab connection portion 251 will block or block the relief hole.

[0117] 8 is a schematic diagram of a reinforcing part according to some embodiments of the present application. In some embodiments of the present application, as shown in FIG. 8, the tab connection part 251 has a first surface 251a facing the first wall 213 and a second surface 251b away from the first wall 213, and a protrusion 2511a is formed on the first surface 251a, and the protrusion 2511a is the reinforcing part 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. When the reinforcing portion 2511 is a protrusion 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 connection portion 251 includes a 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 a part of the main body segment 2512, for example, a pressed portion of the tab connection portion 251 or a thickened portion of the tab connection portion 251.

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

[0121] 9, the reinforcing portion 2511 is an integrally molded structure with the tab connection portion 251 and protrudes from the first surface 251a. A groove 2511b is formed in the second surface 251b at a position corresponding to the protrusion 2511a. Based on the above structure, the reinforcing portion 2511 may be a reinforcing bar formed by press molding the tab connection portion 251.

[0122] In the above embodiment, the grooves corresponding to the protrusions are formed on the second surface 251b, which makes it easier to mold the reinforcing portion 2511 and reduces the weight of the tab connection portion 251.

[0123] In some embodiments of the present application, as shown in FIGS. 7 to 9, the reinforcing portion 2511 is located on the side of the tab connection portion 251 facing the first wall 213 (see FIG. 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 connection portion 251 facing the first wall 213, the tab connection portion 251 can be prevented from deforming toward the first wall 213, reducing the risk that the tab connection portion 251 will block or block the relief hole.

[0126] Fig. 10 is a schematic diagram of a reinforcing part according to still other embodiments of the present application, and Fig. 11 is a partially enlarged view of part A in Fig. 10. In some embodiments of the present application, as shown in Fig. 10 and Fig. 11, the tab connection part 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 part 2511 has a protrusion formed on the second surface 251b and a groove formed at a position corresponding to the protrusion on the first surface 251a.

[0127] The reinforcing portion 2511 may be formed by performing press molding on the adapter 25. Since the reinforcing portion 2511 has a protrusion formed on the second surface 251b and a groove 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 the present application, the projection of the groove onto the first wall 213 covers at least a portion of the pressure relief mechanism 22 .

[0129] The projection of the groove onto the first wall 213 covering 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 the projection of the groove onto the first wall 213 may completely cover the pressure relief mechanism 22. In the above installation, there is a gap between the pressure relief mechanism 22 and the tab connection portion 251 in the thickness direction Z of the first wall 213, thereby reducing the risk that the tab connection portion 251 will block or block 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 that the reinforcing portion 2511 will deform and block or obstruct the relief hole, thereby ensuring pressure relief for the battery cell 20.

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

[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 a space on the side of the tab connection portion 251. This allows the gas to enter the groove through the edge of the tab connection portion 251 and flow toward the pressure relief mechanism 22 when the gas in the battery cell 20 flows 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 can flow in the reinforcement portion 2511, making it easier for gas to flow through the reinforcement portion 2511 toward the pressure relief mechanism 22, making it easier for the pressure relief mechanism 22 to release pressure.

[0134] 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 FIG. 12, a first exhaust passage 2514 that communicates between the inside and the outside of the groove is provided in the groove wall 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 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 a smooth flow of gas and making it easier for the pressure relief mechanism 22 to release pressure.

[0137] 13 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 FIG. 13, when the distance between the bottom surface of the groove and the first wall 213 in the thickness direction Z is C1, and the distance between the first surface 251a and the first wall 213 is C2, the relationship 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, the groove is formed by the first surface being recessed in a direction away from the first wall 213 in the thickness direction Z, and the bottom surface of the groove is the surface of the groove that faces the first wall 213. The bottom surface of the groove is farther 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, so that the gas is ensured to flow toward the pressure relief mechanism 22, and the relief hole is not easily blocked even if the reinforcement portion 2511 is deformed. In addition, the reinforcement portion 2511 does not occupy too much of the mounting space, so that the battery cell 20 is ensured to have a high energy density. When the battery cell 20 experiences thermal runaway, the reinforcement portion 2511 is deformed. 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 reinforcement portion 2511 is likely to block or block the relief hole after deformation, which affects pressure release by the pressure relief mechanism 22. 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 greater than 5 mm, the mounting space occupied by the reinforcing portion 2511 in the thickness direction Z will become large, which will affect 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 the present application, 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 possible to further ensure that gas flows smoothly toward the pressure relief mechanism 22, and the energy density of the battery cell 20 is ensured by rationally utilizing the installation 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 the present application, as shown in Figures 10 and 11, the battery cell 20 further includes a support member 26 including a bottom wall 261 and a side wall 262, where the bottom wall 261 is applied to the bottom surface of the groove and the side wall 262 is formed on the edge of the bottom wall 261 and is applied to the side surface of the groove.

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

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

[0147] The bottom wall 261 is fitted to the bottom surface of the groove and has a large contact area with the bottom surface of the groove, so that 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 the connection strength with the bottom surface of the groove.

[0148] The side wall 262 is applied to the side of the groove and has a large contact area with the side of the groove, so that it has 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 the 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, thereby further improving the strength of the reinforcing portion 2511, reducing the risk that the pressure relief mechanism 22 will be obstructed and blocked, and ensuring pressure relief by the pressure relief mechanism 22.

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

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

[0152] Since the second bent portion 263 is located outside the groove and is applied to the first surface 251a, good connection stability is achieved 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] By assembling the second bent portion 263 to the first surface 251a, a large connection area between the support member 26 and the adapter 25 is ensured, and good connection stability between the support member 26 and the adapter 25 is ensured.

[0154] Fig. 14 is a partial cross-sectional view of a battery cell according to some other embodiments of the present application after thermal runaway (insulating member melts), and Fig. 14 is a cross-sectional view of a portion of the structure of the battery cell 20 after thermal runaway. In some embodiments of the present application, as shown in Fig. 14, when 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, 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, so that the gas is ensured to flow toward the pressure relief mechanism 22, and the relief hole is less likely to be blocked even if the reinforcement portion 2511 is deformed. In addition, the reinforcement portion 2511 and the support member 26 do not occupy too much of the mounting space, so that the battery cell 20 is ensured to have a high energy density. When the battery cell 20 experiences thermal runaway, the reinforcement portion 2511 is deformed. 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 likely to block or block the relief hole after the reinforcement portion 2511 is deformed, which affects pressure release by the pressure relief mechanism 22. 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 greater than 5 mm, the mounting space occupied by the reinforcing portion 2511 and the support member 26 in the thickness direction Z will become large, which will affect the energy density of the battery cell 20.

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

[0157] The connection segment 2513 is a region for direct connection with the tab 242. The connection segment 2513 may be welded to the tab 242 to ensure the stability of the connection between the tab connection portion 251 and the tab 242. When the connection segment 2513 is connected to the tab 242 and the reinforcing portion 2511 is provided on the main body segment 2512, the reinforcing portion 2511 does not interfere with the connection between the tab connection portion 251 and the tab 242.

[0158] In some embodiments of the present application, as shown in FIG. 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 equal to or less than 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 while not interfering with the connection between the connecting segment 2513 and the tab 242.

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

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

[0162] 8, in an embodiment in which the reinforcing portion 2511 is provided separately from the tab connection portion 251, the reinforcing portion 2511 may be plate-shaped or sheet-shaped, and the main body segment 2512 may be made of the same material as the reinforcing portion 2511. When the thickness W1 of the reinforcing portion 2511 and the thickness W2 of the main body segment 2512 satisfy the above relationship, the reinforcing portion 2511 becomes stronger and less likely to deform than other portions 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 protrusion 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] 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 FIG. 4 and FIG. 15, the battery cell 20 further includes a stopper 27 provided between the first wall 213 and the reinforcing portion 2511, and the stopper 27 is configured to abut against the first wall 213 and the reinforcing portion 2511 during thermal runaway of the battery cell 20 to form a second exhaust passage 29 between the reinforcing portion 2511 and the first wall 213.

[0165] The stopper 27 is a part for stopping.

[0166] When thermal runaway occurs in the battery cell 20, the stopper 27 comes into contact with the first wall 213 and the reinforcing portion 2511, so that a gap always exists between the reinforcing portion 2511 and the first wall 213 in the thickness direction Z of the first wall 213, thereby forming the second exhaust passage 29. This allows gas to flow from this second exhaust passage 29 toward the pressure relief mechanism 22.

[0167] In the above embodiment, when thermal runaway occurs in the battery cell 20, the stopper 27 abuts against the first wall 213 and the reinforcing portion 2511 to form a second exhaust passage 29 between the reinforcing portion 2511 and the first wall 213, making it easier for gas to flow through the second exhaust passage 29 toward the pressure relief mechanism 22, making it easier for the pressure relief mechanism 22 to release pressure.

[0168] 4 and 15, in some embodiments of the present application, the battery cell 20 further includes an insulating member 28 positioned between the first wall 213 and the adapter 25 to insulate the first wall 213 and the adapter 25. Here, the stopper 27 has a melting point higher than that of the insulating member 28 and is configured to prevent the adapter 25 from blocking the escape hole after the insulating member 28 melts.

[0169] The material of the insulating member 28 may be, for example, a plastic such as PP (polypropylene) or PE (polyethylene).

[0170] Since the melting point of the stopper 27 is higher than the melting point 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 forms a second exhaust passage 29 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 first wall 213 and the adapter 25 are insulated and separated by the insulating member 28, thereby preventing a short circuit between the first wall 213 and the adapter 25. By making the melting point of the stopper 27 higher than the melting point of the insulating member 28, even if the insulating member 28 melts during thermal runaway of the battery cell 20, the stopper 27 does not melt, and the second exhaust passage 29 is more easily formed between the reinforcing portion 2511 and the first wall 213.

[0172] Fig. 16 is a schematic diagram of a first wall according to some embodiments of the present application. In some embodiments of the present application, as shown in Fig. 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 a surface of the first wall 213 that faces the inside of the battery cell 20. In other words, the third surface 2131 is a surface of the first wall 213 that is closer to the electrode unit 24 in the thickness direction Z.

[0174] There are various methods for fixing the stopper 27 to the first wall 213. For example, the stopper 27 may be integrally formed with the first wall 213, or may be provided separately from the first wall 213 and fixed integrally thereto. The stopper 27 may be welded to the first wall 213, or 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 the stopper 27 to the first wall 213. 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 is aluminum, stainless steel, or aluminum alloy, and the material of the stopper 27 is ceramic. This provides excellent insulation effect and strength.

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

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

[0177] In some embodiments of the present 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 an accommodating portion 283 for accommodating the stopper 27, and the accommodating portion 283 has a protrusion formed on the fifth surface 282 and a groove corresponding to the protrusion formed on the fourth surface 281.

[0178] The fourth surface 281 and the fifth surface 282 are two surfaces of the insulating member 28 that face each other 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 accommodation portion 283 is a portion of the insulating member 28 for accommodating the stopper 27, and is formed by the fourth surface 281 being recessed in a direction away from the first wall 213 in the thickness direction Z.

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

[0181] In some embodiments, the accommodation portion 283 is a through hole. In this case, the material of the stopper 27 is an insulating material, and the stopper 27 penetrates into the through hole. The stopper 27 may abut against the reinforcing portion 2511, or may have a gap between the stopper 27 and the reinforcing portion 2511 in the thickness direction Z.

[0182] In some embodiments of the present application, as shown in FIG. 15 , the adapter 25 includes a tab connection portion 251, which has a first surface 251a facing the first wall 213, and satisfies H1+W1≦H2, where H1 is the distance between a sixth surface 2831 facing the protruding tab connection portion 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.

[0183] The first surface 251a is a surface of the tab connection portion 251 facing the first wall 213. The reinforcing portion 2511 is provided on the first surface 251a side of the tab connection portion 251 and may be integrally molded with the first surface 251a, or may be a protrusion formed on the first surface 251a. The reinforcing portion 2511 may be a first bent portion formed on an edge of the tab connection portion 251 and bent toward the first surface 251a. 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 of the protrusion that faces away from the first wall 213, i.e., a surface that faces away from the first wall 213 of the accommodation portion 283. A distance H1 between the sixth surface 2831 and the first wall 213 is a distance between the surface of the accommodation portion 283 that faces away from the first wall 213 and the first wall 213.

[0185] The first surface 251 a 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 protruding from the first surface 251a, that is, the distance between the first surface 251a and the face of the reinforcing portion 2511 away from the first surface 251a. In addition, 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 in the thickness direction Z, 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 enabling the stopper 27 to abut against the reinforcing portion 2511 to form the second exhaust passage 29 when thermal runaway occurs in the battery cell 20. When H1+W1=H2 is satisfied, the accommodating portion 283 comes into contact with the reinforcing portion 2511. Also, the accommodating portion 283 may abut against the reinforcing portion 2511 so as to restrict movement of the adapter 25 in the thickness direction Z.

[0188] In some embodiments of the present application, the melting point of the stopper 27 is greater 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 a metal (for example, iron, copper, aluminum, etc.) or a ceramic.

[0190] The melting point of the insulating member 28 may be less than 200° C., and 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 melts. As a result, a second exhaust passage 29 is formed 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 condition, so that the stopper 27 does not melt easily and has an excellent stopping effect.

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

[0193] The first sub-stopper 27a and the second sub-stopper 27b are two components that constitute the stopper 27, and the first sub-stopper 27a and the second sub-stopper 27b are provided with a gap between them.

[0194] By providing the pressure relief mechanism 22 between the first sub-stopper 27a and the second sub-stopper 27b, the reinforcing portion 2511 is stopped at two points, and the stopping effect of the stopper 27 is further ensured.

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

[0196] The projection of the reinforcing portion 2511 onto the first wall 213 can cover a part of the first sub-stopper 27a and a part of the second sub-stopper 27b. Moreover, the projection of the reinforcing portion 2511 onto the first wall 213 can cover the entirety of the first sub-stopper 27a and the entirety of the second sub-stopper 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 sub-stopper 27a and the second sub-stopper 27b.

[0198] The reinforcing portion 2511 has high strength, and when the reinforcing portion 2511 abuts against the first sub-stopper 27a and the second sub-stopper 27b, the reinforcing portion 2511 forms a simple beam with the first sub-stopper 27a and the second sub-stopper 27b, reducing the risk that the reinforcing portion 2511 will deform and block or obstruct the relief hole.

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

[0200] The center of the first sub-stopper 27a and the center of the second sub-stopper 27b are both the geometric centers of the first sub-stopper 27a and the second sub-stopper 27b.

[0201] The projection of the center of the first sub-stopper 27a and the center of the second sub-stopper 27b onto the adapter 25 falls within the reinforcing portion 2511, thereby ensuring a large overlapping area between the reinforcing portion 2511 and the first sub-stopper 27a and the second sub-stopper 27b. In the event of thermal runaway of the battery cell, the first sub-stopper 27a and the second sub-stopper 27b effectively stop the reinforcing portion 2511, thereby reducing the risk that the reinforcing portion 2511 will deform and block or obstruct the relief hole 221.

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

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

[0204] Optionally, taking as an example the case where the cross section of the first sub-stopper 27a and the cross section of the second sub-stopper 27b are regular shapes, by making the distance from the center line of the reinforcing portion 2511 to the center line of the first sub-stopper 27a equal to the distance from the center line of the reinforcing portion 2511 to the center line of the second sub-stopper 27b, it is ensured that the forces received by the reinforcing portion 2511 from the first sub-stopper 27a and the second sub-stopper 27b are uniform during thermal runaway of the battery cell 20.

[0205] In the above aspect, the distance L1 between the center line P1 of the first sub-stopper 27a and the center line P2 of the second sub-stopper 27b, and the size L2 of the reinforcing portion 2511 in the first direction X satisfy the above relationship, ensuring a large overlapping area between the reinforcing portion 2511 and the first sub-stopper 27a and the second sub-stopper 27b. Therefore, during thermal runaway of the battery cell 20, the reinforcing portion 2511 is bridged across the first sub-stopper 27a and the second sub-stopper 27b, and the first sub-stopper 27a and the second sub-stopper 27b effectively stop the reinforcing portion 2511, reducing the risk that the reinforcing portion 2511 will deform and block or block the relief hole.

[0206] In some embodiments of the present application, the adapter 25 includes a lead connection portion 252 and a tab connection portion 251. The lead connection portion 252 connects to the electrode lead portion 23. The tab connection portion 251 includes a body segment 2512 and a connection segment 2513. The connection segment 2513 connects to the tab 242, and the reinforcing portion 2511 is provided on the body segment 2512.

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

[0208] In some embodiments of the present application, as shown in FIG. 4, the tab 242 is formed at an end of the electrode unit 24 close to the first wall 213 , and the electrode lead portion 23 is provided on the first wall 213 .

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

[0210] By providing the electrode lead-out portion 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 portion 23.

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

[0212] The pressure relief mechanism 22 and the electrode lead-out portion 23 are both provided on the lid 212. When the tab 242 is formed on the end of the electrode unit 24 close to the lid 212, the configuration of the battery cell 20 becomes compact and the installation space can be utilized efficiently.

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

[0214] 4, 5, 7, and 10, in some embodiments of the present application, the adapter 25 further includes an intermediate connection portion 253 that connects the tab connection portion 251 and the draw-out portion connection portion 252. In order 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 draw-out portion connection portion 252 to form a Z-shape.

[0215] In the thickness direction Z, the projection of the pull-out portion connection portion 252 onto the first wall 213 and the projection of the relay connection portion 253 onto the first wall 213 are configured so as not to overlap with the pressure relief mechanism 22. The reinforcing portion 2511 is located at an end of the tab connection portion 251 away from the connection portion between the tab connection portion 251 and the relay connection portion 253.

[0216] Some embodiments of the present application further provide a battery, the battery including a housing and a plurality of battery cells 20 according to the above embodiments, the plurality of battery cells 20 being disposed in the housing.

[0217] Some embodiments of the present application further provide an electric device, which includes the battery cell 20 according to the above embodiment, and the battery cell 20 supplies power to the electric device.

[0218] The electric device may be a device or system to which any of the battery cells 20 described above is applied.

[0219] Some embodiments of the present application provide a cylindrical battery cell as shown in Figs. 3, 4, and 15. The cylindrical battery cell includes a housing 21, a pressure relief mechanism 22, an electrode lead-out portion 23, an electrode unit 24, an adapter 25, and a stopper 27. The housing 21 includes a housing body 211 and a lid 212. The housing body 211 has an opening, and the lid 212 covers the opening to form a sealed space. The lid 212 is a first wall 213. The pressure relief mechanism 22 is provided on the first wall 213, and the electrode lead-out portion 23 is provided on the first wall 213. The electrode unit 24 is installed in the housing body 211. The electrode unit 24 includes a tab 242 formed on an end of the electrode unit 24 close to the first wall 213. The adapter 25 includes a tab connection portion 251, a pull-out portion connection portion 252, and an intermediate connection portion 253. The intermediate connection portion 253 connects the tab connection portion 251 and the pull-out portion connection portion 252, the tab connection portion 251 is connected to the tab 242, and the pull-out portion connection portion 252 is connected to the electrode pull-out portion 23. A reinforcing portion 2511 is provided in the tab connection portion 251, and a 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 an edge of the tab connection portion 251, and 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 first bent portion is bent toward the first surface 251a and is addressed to the first surface 251a. The stopper 27 is provided between the first wall 213 and the reinforcing portion 2511, and is configured to abut against the first wall 213 and the reinforcing portion 2511 during thermal runaway of the battery cell 20, 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 strength of the tab connection portion 251 is improved by the reinforcing portion 2511, and a stopper 27 is provided between the first wall 213 and the reinforcing portion 2511. Therefore, in the event of thermal runaway of the battery cell 20, a second exhaust passage 29 is formed between the reinforcing portion 2511 and the first wall 213, reducing the risk that the reinforcing portion 2511 will block or block the relief hole, making it easier to release pressure by the pressure relief mechanism 22, and resulting in a cylindrical battery cell with high safety.

[0221] Although the present application has been described with reference to the preferred embodiments, various modifications may be made thereto, and parts therein may be replaced with equivalents, without departing from the scope of the present application. In particular, the respective technical features mentioned in each embodiment may be combined in any manner, provided there is no structural contradiction. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions within the scope of the claims. [Explanation of symbols]

[0222] 100 batteries 10. Chassis 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 Relief hole 23 Electrode extraction part 24 Electrode Unit 241 Main body 242 tabs 25 Adapter 251 Tab connection 251a 1st surface 251b 2nd surface 2511 Reinforcement 2511a Protrusion 2511b Groove 2512 Body Segment 2513 connection segments 2514 First exhaust passage 252 Drawer connection part 253 Relay connection part 26 Support member 261 Bottom wall 262 Side wall 263 Second bending part 27 Stopper 27a First sub stopper 27b Second sub stopper 28 Insulating materials 281 4th surface 282 5th surface 283 Storage Unit 2831 6th surface 29 Second exhaust passage 200 Controller 300 Motor 1000 vehicles

Claims

1. a housing having a first wall; a pressure relief mechanism provided in the first wall; an electrode lead portion provided on the housing; an electrode unit disposed within the housing and including a tab; an adapter that connects the electrode lead portion and the tab; Including, A battery cell, wherein the adapter is provided with a reinforcing portion, and a projection of the reinforcing portion onto the first wall in a thickness direction of the first wall covers at least a portion of the pressure relief mechanism.

2. The battery cell according to claim 1 , wherein the adapter includes a tab connection portion that connects with the tab, and the reinforcing portion is provided on the tab connection portion.

3. the reinforcing portion is a 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 bent portion is bent toward the first surface or the second surface. The battery cell according to claim 2 .

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

5. The tab connection portion has a first surface facing the first wall and a second surface away from the first wall, and a protrusion is formed on the first surface, the protrusion being the reinforcing portion. The battery cell according to claim 2 .

6. The battery cell according to claim 5 , wherein a groove is formed in the second surface at a position corresponding to the protrusion.

7. The tab connection portion has a first surface facing the first wall and a second surface facing away from the first wall, The reinforcing portion has a protrusion formed on the second surface and a groove formed on the first surface at a position corresponding to the protrusion. The battery cell according to claim 2 .

8. The battery cell of claim 7 , wherein the projection of the groove onto the first wall covers at least a portion of the pressure relief mechanism.

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

10. 9. The battery cell according to claim 7, wherein a first exhaust passage is provided in a groove wall of the groove, the first exhaust passage communicating between the inside and the outside of the groove.

11. 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, C1 and C2 satisfy 0.5 mm≦C1−C2≦5 mm. The battery cell according to any one of claims 7 to 10.

12. The battery cell according to claim 11 , wherein C1 and C2 satisfy 1 mm≦C1−C2≦3 mm.

13. a support member including a bottom wall and a side wall; The bottom wall is applied to a bottom surface of the groove, and the side wall is formed on an edge of the bottom wall and applied to a side surface of the groove. The battery cell according to any one of claims 7 to 12.

14. 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 applied to the first surface. The battery cell of claim 13.

15. The tab connection includes a body segment and a connector segment, The connecting segment is connected to the tab, and the reinforcement portion is provided on the body segment. The battery cell according to any one of claims 7 to 14.

16. The connection segment protrudes from the second surface, and a height of the reinforcement portion protruding from the second surface is equal to or less than a height of the connection segment protruding from the second surface. The battery cell of claim 15.

17. The housing further includes a stopper provided between the first wall and the reinforcing portion, The stopper is configured to come into contact with the first wall and the reinforcing portion during thermal runaway of the battery cell to form a second exhaust passage between the reinforcing portion and the first wall. The battery cell according to any one of claims 1 to 16.

18. further comprising an insulating member located between the first wall and the adapter for insulatingly isolating the first wall and the adapter; the stopper has a melting point higher than a melting point of the insulating member, The stopper is configured to prevent the adapter from blocking the pressure relief mechanism after the insulating member melts.

20. The battery cell of claim 17.

19. The first wall has a third surface facing the inside of the battery cell, and the stopper is fixed to the first wall and protrudes from the third surface.

20. The battery cell of claim 18.

20. the insulating member includes a fourth surface facing the first wall and a fifth surface facing away from the first wall; The insulating member is provided with a receiving portion for receiving the stopper, and the receiving portion has a protrusion formed on the fifth surface and a groove formed on the fourth surface corresponding to the protrusion.

20. The battery cell according to claim 18 or 19.

21. the adapter includes a tab connection portion that connects with the tab, the tab connection portion has a first surface facing the first wall; When the distance between the sixth surface of the projection facing the tab connection portion and the first wall is H1, the distance between the first surface and the first wall is H2, and the thickness of the reinforcing portion in the thickness direction is W1, the H1, the W1, and the H2 satisfy H1+W1≦H2.

21. The battery cell of claim 20.

22. The battery cell of claim 18 , wherein the stopper has a melting point greater than 200° C.

23. The stopper includes a first sub-stopper and a second sub-stopper, and the pressure relief mechanism is provided between the first sub-stopper and the second sub-stopper.

20. The battery cell of claim 18.

24. In the thickness direction, a projection of the reinforcing portion onto the first wall covers at least a part of the first sub-stopper and at least a part of the second sub-stopper.

23. The battery cell of claim 22.

25. In the thickness direction, a projection of a center of the first sub-stopper and a center of the second sub-stopper onto the adapter falls within the reinforcing portion.

25. The battery cell of claim 24.

26. The tab is formed at an end of the electrode unit close to the first wall, and the electrode lead portion is provided on the first wall. The battery cell according to any one of claims 1 to 25.

27. A battery comprising: a housing; and a plurality of battery cells according to any one of claims 1 to 26, the plurality of battery cells being disposed within the housing.

28. An electrical device comprising the battery cell according to any one of claims 1 to 26.

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