Battery monomer, battery and electric equipment

Abstract

The invention provides a battery monomer, a battery and electric equipment, and relates to the technical field of batteries. The battery monomer comprises a shell, an electrode assembly, an end cover assembly and a first insulating part; the electrode assembly is accommodated in the shell; the end cover assembly is connected with the shell and seals the opening of the shell; the first insulating part surrounds the periphery of the electrode assembly, and a first connecting part of the first insulating part is connected with the end cover assembly; the end cover assembly is provided with a blocking part, and the blocking part is configured to prevent the first connecting part from extending to the connecting position of the end cover assembly and the shell, so that the risk that the first connecting part extends to the connecting position of the end cover assembly and the shell due to the fact that the first connecting part is matched with the electrode assembly or the end cover assembly or due to the connecting technology (the welding technology, the welding technology and the like) and the like can be reduced; therefore, the first connecting part is prevented from interfering with the connection of the end cover assembly and the shell, so that the connection quality of the end cover assembly and the shell is improved, the production yield of the battery and the sealing performance of the battery monomer are improved, and the risk of liquid leakage corrosion is reduced.

Description

Battery cells, batteries and electrical equipment Technical Field

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

[0002] At present, the batteries most commonly used in vehicles are lithium-ion batteries. As a rechargeable battery, lithium-ion batteries have the advantages of small size, high energy density, high power density, many cycles and long storage time.

[0003] A battery cell consists of an end cap assembly, a housing, and an electrode assembly. The end cap assembly connects to the housing and seals the opening in the housing, creating a space for the electrode assembly. The quality of the connection between the end cap assembly and the housing is crucial to the performance of the battery cell. Therefore, improving the connection quality between the end cap assembly and the housing has become an urgent problem in the field of battery technology.

[0004] Summary of the Invention

[0005] Embodiments of the present application provide a battery cell, a battery, and an electrical device to improve the connection quality between an end cap assembly and a housing of a battery cell.

[0006] In a first aspect, an embodiment of the present application provides a battery cell comprising a shell, an electrode assembly, an end cover assembly, and a first insulating member; the shell has an opening; the electrode assembly is accommodated in the shell; the end cover assembly is connected to the shell and is used to close the opening; the first insulating member is arranged around the periphery of the electrode assembly, the first insulating member includes a first connecting portion, and the first connecting portion is connected to the end cover assembly; wherein the end cover assembly includes a blocking portion, and the blocking portion is configured to block the first connecting portion from extending to the connection position between the end cover assembly and the shell.

[0007] In the above technical solution, the end cover assembly is formed with a blocking portion. During and after the connection process between the first connecting portion and the end cover assembly, the blocking portion blocks the first connecting portion of the first insulating member from extending to the connection position between the end cover assembly and the shell. This can reduce the risk of the first connecting portion extending to the connection position between the end cover assembly and the shell due to the cooperation of the electrode assembly or the end cover assembly or due to the connection process (welding process, welding process, etc.) and other reasons, thereby avoiding the first connecting portion interfering with the connection between the end cover assembly and the shell, thereby improving the connection quality of the end cover assembly and the shell, improving the production efficiency of the battery, and is conducive to improving the sealing performance between the end cover assembly and the shell, reducing the risk of leakage corrosion, and improving the safety performance of the battery cell.

[0008] In some embodiments of the first aspect of the present application, the blocking portion is located between the first connecting portion and the connecting position.

[0009] In the above technical solution, the blocking portion is located between the connection position between the end cover assembly and the shell and the first connection portion, so that the blocking portion can more conveniently block the first connection portion from extending in a direction close to the connection position.

[0010] In some embodiments of the first aspect of the present application, the end cap assembly includes an end cap and a second insulating member, the end cap is connected to the shell to close the opening and form the connection position, the second insulating member is arranged on the side of the end cap facing the electrode assembly, the second insulating member is configured to separate the end cap and the electrode assembly, and the first connecting portion is connected to the second insulating member.

[0011] In the above technical solution, the second insulating member can insulate and separate the end cap and electrode assembly, reducing the risk of short circuits in the battery cells and improving the safety performance of the battery cells. The first connecting portion of the first insulating member is connected to the second insulating member, so that the first insulating member and the end cap assembly are connected as a whole. This reduces the risk of the first insulating member and the electrode assembly shaking when the end cap assembly is connected to the housing, and facilitates a high-quality connection between the end cap and the housing.

[0012] In some embodiments of the first aspect of the present application, the end cover is formed with the blocking portion.

[0013] In the above technical solution, a blocking portion is formed on the end cover, which is convenient for the blocking portion to be set corresponding to the connection position of the end cover and the shell, so that the blocking portion can accurately block the first connection portion from extending to the connection position of the end cover and the shell.

[0014] In some embodiments of the first aspect of the present application, a surface of the end cover facing the electrode assembly is provided with a groove, and at least a portion of a side surface of the groove forms the blocking portion.

[0015] In the above technical solution, a groove is provided on the surface of the end cover facing the electrode assembly, and at least a portion of the groove side surface forms a blocking portion, so that the blocking portion is formed in a relatively simple manner, and there is no need to provide a separate blocking portion to occupy additional space inside the shell.

[0016] In some embodiments of the first aspect of the present application, the end cover includes a connection area extending beyond an outer edge of the second insulating member, the connection area is connected to the shell and forms the connection position, and the blocking portion is formed in the connection area.

[0017] In the above technical solution, the blocking portion is formed in the connection area where the end cover extends beyond the second insulating member, reducing the risk of the blocking portion interfering with the second insulating member and causing the blocking portion to fail to block the first connecting portion.

[0018] In some embodiments of the first aspect of the present application, the second insulating member is formed with the blocking portion.

[0019] In the above technical solution, a blocking portion is formed on the second insulating part, so the blocking portion can be further away from the connection position between the end cover and the shell, and can block the first connection portion at a position farther away from the connection position between the end cover and the shell, further reducing the risk of the first connection portion interfering with the connection between the end cover and the shell.

[0020] In some embodiments of the first aspect of the present application, a surface of the second insulating member facing the electrode assembly is provided with a groove, and at least a portion of a side surface of the groove forms the blocking portion.

[0021] In the above technical solution, a groove is provided on the surface of the second insulating part facing the electrode assembly, and at least a portion of the side surface of the groove forms a blocking portion, so that the formation method of the blocking portion is relatively simple, and there is no need to set a separate blocking portion to occupy additional space inside the shell.

[0022] In some embodiments of the first aspect of the present application, the second insulating member includes an insulating body and a second connecting portion, the insulating body and the end cover are stacked, the second connecting portion extends from the insulating body in a direction facing the electrode assembly, and the first connecting portion is connected to the outer side surface of the second connecting portion; the insulating body includes an extension area protruding from the outer side surface of the second connecting portion, and the groove is formed in the extension area.

[0023] In the above technical solution, the groove is formed in the extension area of ​​the insulating body beyond the second connecting portion, thereby forming a blocking portion in the extension area, reducing the risk of the blocking portion interfering with the second connecting portion, resulting in the blocking portion failing to block the first connecting portion. The second connecting portion extends from the insulating body in a direction facing the electrode assembly, and the first connecting portion is connected to the outer side of the second connecting portion, resulting in a larger connection area between the first and second connecting portions, which is beneficial for improving the connection stability between the first and second connecting portions.

[0024] In some embodiments of the first aspect of the present application, along the arrangement direction of the end cover assembly and the electrode assembly, the distance between the bottom surface of the groove and the end of the blocking portion close to the electrode assembly is H1, and the distance between the surface of the insulating body facing the end cover and the end of the second connecting portion facing the electrode assembly is H2, satisfying: 0

[0025] ​In the above technical solution, if H1 / H2>1, the size of the blocking part along the arrangement direction of the end cover assembly and the electrode assembly exceeds the size of the second connecting part along the arrangement direction of the end cover assembly and the electrode assembly, and exceeds the connection area of ​​the first connecting part and the second connecting part. Part of the blocking part cannot play the role of blocking the first connecting part, resulting in excess function and waste. Therefore, 0

[0026] In some embodiments of the first aspect of the present application, the end cover assembly includes an end cover, and the outer peripheral surface of the end cover is connected to the inner peripheral surface of the shell to form the connection position.

[0027] In the above technical solution, the connection between the end cover and the shell is achieved through the outer circumference of the end cover and the inner circumference of the shell. Then, along the thickness direction of the end cover, at least a part of the end cover is accommodated in the shell, which is conducive to reducing the overall structural dimensions of the battery cell along the thickness direction of the end cover.

[0028] In some embodiments of the first aspect of the present application, the blocking portion is a closed-loop structure extending along the circumference of the electrode assembly; or, there are multiple blocking portions, and the multiple blocking portions are arranged at intervals along the circumference of the electrode assembly.

[0029] In the above technical solution, if the blocking portion is a closed-loop structure extending along the circumference of the electrode assembly, the blocking portion can block the first connecting portion from extending toward the connection point between the end cap assembly and the housing at any position along the circumference of the electrode assembly, thereby achieving a better blocking effect. If multiple blocking portions are arranged at intervals along the circumference of the electrode assembly, the blocking portion can be formed at a position where the first connecting portion extends significantly or in an area corresponding to the first connecting portion extending toward the connection point. This can simplify the structure of the end cap assembly and avoid waste caused by excessive blocking portion functionality.

[0030] In some embodiments of the first aspect of the present application, along the first direction, the blocking portion includes a first blocking surface arranged facing the outer side of the first connecting portion, the distance between the outer side surface of the first connecting portion and the first blocking surface is L1, and the distance between the outer side surface of the first connecting portion and the inner circumferential surface of the shell is L2, satisfying: 0.02≤L1 / L2<1.

[0031] ​In the above technical solution, if L1 / L2 is less than 0.02, the distance between the first connecting part and the blocking part is too small, and the blocking part cannot completely block the first connecting part from extending toward the connection position between the end cover assembly and the shell. L1 / L2>1 does not conform to the actual product design. Therefore, 0.02≤L1 / L2<1 enables the blocking part to effectively block the first connecting part from extending toward the connection position between the end cover assembly and the shell during and after the connection between the first connecting part and the end cover assembly, thereby reducing the risk of the first connecting part interfering with the connection between the shell and the end cover assembly and improving the connection quality of the shell and the end cover assembly.

[0032] In a second aspect, an embodiment of the present application provides a battery, comprising the battery cell provided by any embodiment of the first aspect.

[0033] In a third aspect, an embodiment of the present application provides an electrical device, comprising the battery provided in the embodiment of the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0035] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0036] FIG2 is a schematic structural diagram of a battery provided in some embodiments of the present application;

[0037] FIG3 is a schematic diagram of the exploded structure of a battery cell provided in some embodiments of the present application;

[0038] FIG4 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0039] Figure 5 is an enlarged view of point B in Figure 4;

[0040] FIG6 is a partial cross-sectional view of a battery cell provided in some other embodiments of the present application;

[0041] FIG7 is an enlarged view of point D in FIG6 ;

[0042] FIG8 is a partial cross-sectional view of a battery cell provided in some other embodiments of the present application;

[0043] FIG9 is an enlarged view of point E in FIG8 ;

[0044] FIG10 is a partial cross-sectional view of a battery cell provided in yet other embodiments of the present application;

[0045] FIG11 is an enlarged view of point F in FIG10 ;

[0046] FIG12 is a partial cross-sectional view of a battery cell provided in yet other embodiments of the present application;

[0047] FIG13 is an enlarged view of point G in FIG12;

[0048] FIG14 is a partial cross-sectional view of a battery cell provided in yet other embodiments of the present application;

[0049] FIG15 is an enlarged view of point H in FIG14 ;

[0050] FIG16 is a partial cross-sectional view of a battery cell provided in some other embodiments of the present application;

[0051] FIG17 is an enlarged view of point J in FIG16 ;

[0052] FIG18 is a partial cross-sectional view of a battery cell provided in some other embodiments of the present application;

[0053] FIG19 is an enlarged view of point K in FIG18 .

[0054] Icons: 1000-vehicle; 100-battery; 10-housing; 11-first part; 12-second part; 20-battery cell; 21-housing; 211-opening; 212-inner circumference of the housing; 213-outer circumference of the housing; 22-electrode assembly; 221-main body; 222-ear; 23-end cap assembly; 231-blocking part; 2311-first blocking surface; 232-liquid injection hole; 233-end cap; 2331-outer circumference of the end cap; 2332-cap body; 2333-edge portion; 23331-inner circumference of the edge portion; 2334-connecting area; 23341-first surface; 234-second Two insulating parts; 2341-insulating body; 23411-outer edge of the insulating body; 23412-extension area; 23413-second surface; 2342-second connecting part; 23421-outer side surface of the second connecting part; 235-groove; 24-first insulating part; 241-first connecting part; 2411-outer side surface of the first connecting part; 2412-inner side surface of the first connecting part; 242-open end; 25-electrode terminal; 26-current collecting component; 27-pressure relief mechanism; 28-sealing pin; 29-first protrusion; 200-controller; 300-motor; A-connection position; X-arrangement direction; Y-first direction. DETAILED DESCRIPTION

[0055] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0056] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0057] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0058] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0059] In the description of the embodiments of the present application, it should be noted that the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of the application is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. These are merely for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present application. In addition, the terms "first," "second," "third," etc. are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0060] Currently, market developments indicate that power batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0061] A battery cell includes a housing, an electrode assembly, an end cap assembly, and a first insulating member. The electrode assembly is housed in the housing, and the end cap assembly is connected to the housing and serves to seal the housing opening. The first insulating member surrounds the electrode assembly and is connected to the end cap assembly, forming a single, integrated structure.

[0062] The inventors discovered that during the connection process between the end cap assembly and the first insulating member, the first insulating member undergoes deformation from compression with the end cap assembly, melting under high temperatures, and other factors, causing the structural morphology of the portion where the first insulating member and the end cap assembly meet to change, extending in other directions and even extending to the connection point between the end cap assembly and the housing. During this connection process, the extended first insulating member interferes with the connection point between the end cap assembly and the housing, resulting in a poor connection quality between the housing and the end cap assembly, reducing the sealing performance between the end cap assembly and the housing, and increasing the risk of leakage and corrosion, thereby reducing the safety performance of the battery cells. This poor connection quality between the housing and the end cap assembly also increases the defective rate of battery cells during production.

[0063] Based on the above considerations, in order to alleviate the problem of poor connection quality between the shell and the end cover assembly, the inventors have designed a battery cell after in-depth research. The first insulating part of the battery cell includes a first connecting part, which is connected to the end cover assembly of the battery cell; the end cover assembly has a blocking part, which is configured to block the first connecting part from extending to the connection position between the end cover assembly and the shell.

[0064] The end cap assembly is formed with a blocking portion. During and after the connection between the first connecting portion and the end cap assembly, the blocking portion blocks the first connecting portion of the first insulating member from extending to the connection position between the end cap assembly and the shell. This can reduce the risk of the first connecting portion extending to the connection position between the end cap assembly and the shell due to cooperation with the electrode assembly or the end cap assembly or due to connection processes (welding processes, welding processes, etc.) and other reasons, thereby avoiding the first connecting portion interfering with the connection between the end cap assembly and the shell, thereby improving the connection quality between the end cap assembly and the shell, improving the production efficiency of the battery, and helping to improve the sealing performance between the end cap assembly and the shell, reducing the risk of leakage corrosion, and improving the safety performance of the battery cell.

[0065] The battery cells disclosed in the embodiments of this application can be used, but are not limited to, in electrical equipment such as vehicles, ships, or aircraft. A power supply system comprising the battery cells and batteries disclosed in this application can be used to alleviate the problem of poor connection quality between the battery cell housing and end cap assembly, thereby improving the safety performance of the battery.

[0066] The embodiments of the present application provide an electric device that uses a battery as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0067] Please refer to Figure 1, which is a schematic structural diagram of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0068] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0069] Please refer to Figure 2, which is an exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. The housing 10 is used to provide a storage space for the battery cell 20, and the housing 10 can have various structures. In some embodiments, the housing 10 can include a first portion 11 and a second portion 12, which overlap each other and together define a storage space for the battery cell 20. The second portion 12 can be a hollow structure with one end open to form a storage cavity for the battery cell 20. The first portion 11 can be a plate-like structure, which overlaps the open side of the second portion 12, so that the first portion 11 and the second portion 12 together define a storage space. Alternatively, the first portion 11 and the second portion 12 can each be a hollow structure with one end open to form a storage cavity for the battery cell 20, with the open side of the first portion 11 overlapping the open side of the second portion 12. Of course, the box body 10 formed by the first part 11 and the second part 12 can be in various shapes, such as a cylinder, a cuboid, etc.

[0070] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell 20 may be housed within the housing 10. Alternatively, the battery 100 may be constructed by first connecting multiple battery cells 20 in series, in parallel, or in a hybrid connection to form a battery module, which is then connected in series, in parallel, or in a hybrid connection to form a complete battery module, and then housed within the housing 10. The battery 100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 20.

[0071] Each battery cell 20 may be a secondary battery or a primary battery, and may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0072] As shown in Figures 3 and 4, the battery cell 20 includes a shell 21, an electrode assembly 22, an end cover assembly 23 and a first insulating member 24; the shell 21 has an opening 211; the electrode assembly 22 is accommodated in the shell 21; the end cover assembly 23 is connected to the shell 21 and is used to close the opening 211; the first insulating member 24 is arranged around the periphery of the electrode assembly 22, and the first insulating member 24 includes a first connecting portion 241, which is connected to the end cover assembly 23; wherein the end cover assembly 23 includes a blocking portion 231, which is configured to block the first connecting portion 241 from extending to the connection position A between the end cover assembly 23 and the shell 21.

[0073] The battery cell 20 is the smallest unit that makes up the battery 100. The housing 21 is a component that cooperates with the end cap assembly 23 to form the internal environment of the battery cell 20. This internal environment can be used to accommodate the electrode assembly 22, electrolyte, and other components. The housing 21 and the end cap assembly 23 can be separate components. An opening 211 can be provided in the housing 21, and the end cap assembly 23 is placed over the opening 211 to form the internal environment of the battery cell 20. Alternatively, the end cap assembly 23 and the housing 21 can be integrated. Specifically, the end cap assembly 23 and the housing 21 can form a common connection surface before other components are inserted into the housing. When the interior of the housing 21 needs to be enclosed, the end cap assembly 23 is placed over the housing 21. The housing 21 can have a variety of shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the housing 21 can be determined based on the specific shape and size of the electrode assembly 22. The shell 21 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0074] The end cap assembly 23 covers the opening 211 of the housing 21 to separate the internal environment of the battery cell 20 from the external environment.

[0075] The electrode assembly 22 is the component in the battery cell 20 where the electrochemical reaction occurs. One or more electrode assemblies 22 may be contained within the housing 21. The electrode assembly 22 is primarily formed by winding or stacking positive and negative electrode sheets, and a separator is typically provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active materials constitute the main body 221 of the electrode assembly 22, while the portions of the positive and negative electrode sheets without active materials each constitute a tab 222. The positive and negative electrode tabs may be located together at one end of the main body 221 or separately at both ends of the main body 221.

[0076] Other functional components may also be provided on the end cap assembly 23. For example, the end cap assembly 23 may be provided with an electrode terminal 25, which may be electrically connected to the tab 222 to output electrical energy from the battery cell 20. The tab 222 and the electrode terminal 25 may be electrically connected via a current collecting member 26. The end cap assembly 23 may be provided with one electrode terminal 25 or two electrode terminals 25. In an embodiment in which one electrode terminal 25 is provided on the end cap assembly 23, one of the positive and negative tabs is electrically connected to the electrode terminal 25, and the other of the positive and negative tabs may be electrically connected to the housing 21. In an embodiment in which two electrode terminals 25 are provided on the end cap assembly 23, the two electrode terminals 25 may be electrically connected to the positive and negative tabs, respectively. During the charge and discharge process of the battery 100, the positive and negative active materials react with the electrolyte, and the tab 222 connects to the electrode terminal 25 to form a current circuit.

[0077] The end cap assembly 23 may also be provided with a pressure relief mechanism 27 for releasing the pressure inside the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a threshold value, thereby reducing the risk of fire, explosion, or other safety accidents caused by thermal runaway of the battery cell 20 .

[0078] The end cap assembly 23 may further be provided with a liquid injection hole 232 , through which electrolyte may be injected into the battery cell 20 , and the liquid injection hole 232 may be sealed by a sealing pin 28 .

[0079] The first insulating member 24 is disposed around the outer circumference of the main body 221 of the electrode assembly 22 to insulate the main body 221 from the housing 21. Along the arrangement direction X of the electrode assembly 22 and the end cap assembly 23, at least one end of the first insulating member 24 is an open end 242. One open end 242 of the first insulating member 24 is disposed opposite the end cap assembly 23. The tab 222 of the electrode assembly 22 can extend from the open end 242 out of the space enclosed by the first insulating member 24 and be electrically connected to the electrode terminal 25. Along the arrangement direction X of the electrode assembly 22 and the end cap assembly 23, the first insulating member 24 protrudes from one end of the main body 221 in a direction closer to the end cap assembly 23. At least the portion of the first insulating member 24 that protrudes from one end of the main body 221 in a direction closer to the end cap assembly 23 forms a first connecting portion 241. The first connecting portion 241 may be a closed loop structure that is enclosed along the circumference of the electrode assembly 22. The first connection portion 241 may also be a non-enclosed structure extending along the circumference of the electrode assembly 22 . The first insulating member 24 may include a plurality of first connection portions 241 , which are arranged at intervals along the circumference of the electrode assembly 22 .

[0080] The material of the first insulating member 24 can be a special insulating material (such as polysulfone, polyarylate, polytetrafluoroethylene, polyimide, etc.), a general insulating material (such as polystyrene, polypropylene, polyethylene, etc.), a thermosetting plastic (such as polyurethane, furan, allyl ester, phenolic, unsaturated polyester, silicone, amino plastic, etc.), or an engineering plastic (such as polycarbonate, thermoplastic polyester, nylon, modified polyphenylene ether, thermoplastic polyester, etc.).

[0081] The connection method between the first connection portion 241 and the end cover assembly 23 can be at least one of welding connection, interference fit, adhesive connection, etc.

[0082] The first connecting portion 241 is connected to the end cap assembly 23, so that the first insulating member 24 and the end cap assembly 23 are connected as a whole. When the end cap assembly 23 and the housing 21 are connected, the first insulating member 24 does not shake relative to the end cap assembly 23 and the housing 21. The end cap assembly 23 and the housing 21 can be connected by welding, adhesive bonding, etc.

[0083] Before connecting the end cap assembly 23 to the housing 21, first connect the first connecting portion 241 to the end cap assembly 23, so that the first insulating member 24 and the end cap assembly 23 are connected to form a single unit. The end cap assembly 23 is then connected to the housing 21, so that the end cap assembly 23 covers the opening 211 of the housing 21. To ensure a good connection between the end cap assembly 23 and the housing 21, the first insulating member 24 and the end cap assembly 23 must not interfere with the connection point A between the end cap assembly 23 and the housing 21. For example, as shown in Figures 4 and 5, when the first connection part 241 and the end cover assembly 23 are welded, the first connection part 241 and the end cover assembly 23 will be partially molten when exposed to high temperature, and the shape of the melted first connection part 241 will change. After solidification, the first connection part 241 may extend irregularly in the direction close to the connection position A between the end cover assembly 23 and the shell 21. If the extension size is too large, the end cover assembly 23 and the shell 21 may not fit well, thereby making it impossible to achieve high-quality connection between the end cover assembly 23 and the shell 21. For another example, the first connecting portion 241 is interference fit with the end cover assembly 23, and the end cover assembly 23 causes the first connecting portion 241 to deform toward the direction close to the connection position A between the end cover assembly 23 and the shell 21, or during the cooperation between the first insulating member 24 and the electrode assembly 22, that is, during the process in which the first insulating member 24 is arranged around the outer periphery of the electrode assembly 22, the end surface of the open end 242 of the first insulating member 24 facing the end cover assembly 23 is not flush, resulting in a part of the end surface of the open end 242 being closer to the connection position A between the end cover assembly 23 and the shell 21, and another part of the end surface being further away from the connection position A between the end cover assembly 23 and the shell 21. The area closer to the connection position A between the end cover assembly 23 and the shell 21 may interfere with the connection between the end cover assembly 23 and the shell 21.

[0084] The blocking portion 231 blocks the first connecting portion 241 from extending toward the connection position A between the end cap assembly 23 and the housing 21. The first connecting portion 241 itself may be extended until it abuts against the blocking portion 231, and the blocking portion 231 can block the first connecting portion 241 from further extending toward the connection position A between the end cap assembly 23 and the housing 21. The blocking portion 231 blocks the first connecting portion 241 from extending toward the connection position A between the end cap assembly 23 and the housing 21. The blocking portion 231 may also block the first connecting portion 241 from extending toward the connection position A between the end cap assembly 23 and the housing 21 after the first connecting portion 241 is extended. For example, after the first connecting portion 241 is extended, the first connecting portion 241 is manually bent until it abuts against the blocking portion 231, so that the blocking portion 231 blocks the first connecting portion 241 from extending toward the connection position A between the end cap assembly 23 and the housing 21.

[0085] Therefore, the end cover assembly 23 is formed with a blocking portion 231. During and after the connection between the first connecting portion 241 and the end cover assembly 23, the blocking portion 231 blocks the first connecting portion 241 of the first insulating member 24 from extending to the connection position A between the end cover assembly 23 and the shell 21. This can reduce the risk of the first connecting portion 241 extending to the connection position A between the end cover assembly 23 and the shell 21 due to cooperation with the electrode assembly 22 or the end cover assembly 23 or due to connection processes (welding processes, welding processes, etc.) and other reasons, thereby avoiding the first connecting portion 241 interfering with the connection between the end cover assembly 23 and the shell 21, thereby improving the connection quality between the end cover assembly 23 and the shell 21, improving the production efficiency of the battery 100, and helping to improve the sealing performance between the end cover assembly 23 and the shell 21, reducing the risk of leakage corrosion, and improving the safety performance of the battery cell 20.

[0086] As shown in FIG. 5 , in some embodiments, the blocking portion 231 is located between the first connecting portion 241 and the connecting position A.

[0087] Along the first direction Y, the blocking portion 231 is located outside the first connecting portion 241, and the connection position A is located outside the blocking portion 231. The first direction Y is perpendicular to the arrangement direction X of the electrode assembly 22 and the end cap assembly 23. The first direction Y can be any direction perpendicular to the arrangement direction X of the electrode assembly 22 and the end cap assembly 23.

[0088] The outer side of the first connecting portion 241 is located along the first direction Y, on a side of the first connecting portion 241 away from the electrode assembly 22, that is, the entire blocking portion 231 is located on a side of the first connecting portion 241 away from the electrode assembly 22 along the first direction Y. The outer side of the blocking portion 231 is located along the first direction Y, on a side of the blocking portion 231 away from the electrode assembly 22, that is, the connection position A between the electrode assembly 22 and the end cap assembly 23 is located on a side of the blocking portion 231 away from the electrode assembly 22 along the first direction Y.

[0089] Observing along the arrangement direction X of the electrode assembly 22 and the end cover assembly 23, the blocking portion 231 is located in the space between the connection position A (the connection position A between the end cover assembly 23 and the shell 21) and the first connection portion 241, and the blocking portion 231 is located on the path extending from the first connection portion 241 to the connection position A between the end cover assembly 23 and the shell 21.

[0090] The blocking portion 231 is located between the connection position A between the end cover assembly 23 and the shell 21 and the first connection portion 241 , so that the blocking portion 231 can more conveniently block the first connection portion 241 from extending in a direction close to the connection position A.

[0091] In other embodiments, a portion of the blocking portion 231 is located at another position, and another portion extends between the outer side of the first connecting portion 241 and the inner side of the connection position A (the connection position A between the end cap assembly 23 and the shell 21). This allows the blocking portion 231 to be more flexibly arranged. Exemplarily, the blocking portion 231 includes a connected connecting segment and a blocking segment, the connecting segment is connected to the surface opposite to the end cap assembly 23 and the electrode assembly 22, and the blocking segment extends from the connecting segment to between the outer side of the first connecting portion 241 and the inner side of the connection position A. When viewed along the arrangement direction X of the electrode assembly 22 and the end cap assembly 23, at least a portion of the blocking portion 231 is located in the space between the outer side of the first connecting portion 241 and the connection position A, and the blocking portion 231 is located on the path extending from the first connecting portion 241 to the connection position A between the end cap assembly 23 and the shell 21.

[0092] In some embodiments, the blocking portion 231 is closer to the connecting position A than the first connecting portion 241 .

[0093] It can be understood that, along the arrangement direction X of the electrode assembly 22 and the end cap assembly 23, the distance between the end of the blocking portion 231 closest to the connection position A between the end cap assembly 23 and the housing 21 and the connection position A is smaller than the distance between the end of the first connection portion 241 closest to the blocking portion 231 and the end of the blocking portion 231 closest to the first connection portion 241. And / or, along the first direction Y, the distance between the end of the blocking portion 231 closest to the connection position A between the end cap assembly 23 and the housing 21 and the connection position A is smaller than the distance between the side of the first connection portion 241 closest to the blocking portion 231 and the side of the blocking portion 231 closest to the first connection portion 241.

[0094] The blocking portion 231 is closer to the connection position A between the end cover assembly 23 and the shell 21 than the first connecting portion 241, so there is a larger space between the blocking portion 231 and the first connecting portion 241 to allow the first connecting portion 241 to extend, which is conducive to better cooperation between the end cover assembly 23 and the first connecting portion 241, thereby improving the connection quality between the end cover assembly 23 and the first connecting portion 241.

[0095] In other embodiments, the distance between the blocking portion 231 and the first connecting portion 241 may be the same as the distance between the blocking portion 231 and the connecting position A. Alternatively, the blocking portion 231 may be further away from the connecting position A than the first connecting portion 241 .

[0096] As shown in Figure 5, in some embodiments, the end cover assembly 23 includes an end cover 233 and a second insulating member 234, the end cover 233 is connected to the shell 21 to close the opening 211 and form a connection position A, the second insulating member 234 is arranged on the side of the end cover 233 facing the electrode assembly 22, the second insulating member 234 is configured to separate the end cover 233 and the electrode assembly 22, and the first connecting portion 241 is connected to the second insulating member 234.

[0097] The end cap 233 may be a plate-like structure. The end cap 233 covers the opening 211 of the shell 21 to separate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 233 may be adapted to the shape of the shell 21 to match the shell 21. Optionally, the end cap 233 may be made of a material with a certain hardness and strength (such as an aluminum alloy). In this way, the end cap 233 is less likely to deform when squeezed or collided, so that the battery cell 20 can have a higher structural strength and improved safety performance. Functional components such as electrode terminals 25 may be provided on the end cap 233. The electrode terminal 25 can be used to electrically connect to the electrode assembly 22 for outputting or inputting electrical energy of the battery cell 20. In some embodiments, the end cap 233 may also be provided with a pressure relief mechanism 27 for releasing internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The injection hole 232 may also be provided on the end cap 233. The end cap 233 may also be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0098] The arrangement direction X of the electrode assembly 22 and the end cap assembly 23 is parallel to the thickness direction of the end cap 233 .

[0099] The end cover 233 and the housing 21 can be connected by welding, bonding, crimping, etc.

[0100] Along the arrangement direction X of the electrode assembly 22 and the end cap assembly 23, at least a portion of the second insulating member 234 is stacked with the end cap 233. The second insulating member 234 insulates and isolates the end cap 233 from the electrode assembly 22 to reduce the risk of short circuits. The material of the second insulating member 234 can be similar to or different from that of the first insulating member 24. For example, the second insulating member 234 can be made of plastic, rubber, or the like.

[0101] The first connection portion 241 and the second insulating member 234 may be connected by at least one of welding, interference fit, and adhesive connection.

[0102] The second insulating member 234 insulates and separates the end cap 233 from the electrode assembly 22, reducing the risk of short circuits in the battery cells 20 and improving the safety of the battery cells 20. The first connecting portion 241 of the first insulating member 24 is connected to the second insulating member 234, thereby connecting the first insulating member 24 and the end cap assembly 23 into a single unitary structure. This reduces the risk of shaking between the first insulating member 24 and the electrode assembly 22 when the end cap assembly 23 is connected to the housing 21, and facilitates a high-quality connection between the end cap 233 and the housing 21.

[0103] As shown in FIG. 4 , FIG. 5 , FIG. 6 , and FIG. 7 , in some embodiments, the end cover 233 is formed with a blocking portion 231 .

[0104] The blocking portion 231 formed on the end cap 233 can be provided separately from the end cap 233, and then the end cap 233 and the blocking portion 231 are connected as a whole by welding, bonding, snap connection, etc. The material of the blocking portion 231 can be the same as or different from that of the end cap 233.

[0105] The blocking portion 231 formed on the end cover 233 may also be integrally formed with the end cover 233 .

[0106] A blocking portion 231 is formed on the end cover 233 so that the blocking portion 231 is set corresponding to the connection position A between the end cover 233 and the shell 21, so that the blocking portion 231 can accurately block the first connection portion 241 from extending to the connection position A between the end cover 233 and the shell 21.

[0107] There are many ways to form the blocking portion 231 on the end cover 233. As shown in Figure 5, in some embodiments, a groove 235 is provided on the surface of the end cover 233 facing the electrode assembly 22, and at least a portion of the groove side of the groove 235 forms the blocking portion 231.

[0108] The groove 235 is recessed from the surface of the end cap 233 facing the electrode assembly 22 toward a direction away from the electrode assembly 22. The depth of the recessed groove 235 is less than the thickness of the end cap 233 in the arrangement direction X of the electrode assembly 22 and the end cap assembly 23.

[0109] The groove 235 can have various shapes, such as a rectangular groove, a circular groove, etc., which is not limited in this application. For example, as shown in FIG5 , the groove 235 is a rectangular groove, and the groove side surface of the groove 235 has two portions arranged oppositely along the first direction Y. Of the two portions of the groove side surface of the groove 235 that are opposite in the first direction Y, the one closer to the housing 21 forms the blocking portion 231.

[0110] As shown in FIG5 , during and after the connection between the first connecting portion 241 and the end cap assembly 23, if the first connecting portion 241 extends too far toward the connection position A between the end cap assembly 23 and the housing 21, the side surface of the groove 235 adjacent to the housing 21 will prevent the first connecting portion 241 from further extending toward the connection position A between the end cap assembly 23 and the housing 21. In FIG5 , the first connecting portion 241 in dashed form that abuts against the blocking portion 231 represents a significant extension of the first connecting portion 241.

[0111] A groove 235 is provided on the surface of the end cover 233 facing the electrode assembly 22, and at least a portion of the groove side surface of the groove 235 forms a blocking portion 231, so that the formation method of the blocking portion 231 is relatively simple, and there is no need to separately provide the blocking portion 231 to cause additional occupation of the internal space of the shell 21.

[0112] In other embodiments, as shown in Figures 6 and 7, a first protrusion 29 is provided on the surface of the end cap 233 facing the electrode assembly 22. The first protrusion 29 is a blocking portion 231 formed on the end cap 233. The first protrusion 29 and the end cap 233 can be provided separately, and then connected to each other as a whole by welding, bonding, snap connection, etc. The first protrusion 29 and the end cap 233 can also be integrally formed. The first connecting portion 241 in the form of a dotted line that offsets the blocking portion 231 in Figure 7 represents a case where the first connecting portion 241 extends a large amount.

[0113] 5 and 7 , in some embodiments, the end cap 233 includes a connection area 2334 extending beyond the outer edge of the second insulating member 234 . The connection area 2334 connects to the housing 21 and forms a connection position A. The blocking portion 231 is formed in the connection area 2334 .

[0114] Along a direction perpendicular to the arrangement direction X of the electrode assembly 22 and the end cap assembly 23, the outer peripheral surface 2331 of the end cap protrudes beyond the outer edge of the second insulating member 234. The end cap 233 may extend beyond a portion of the outer edge of the second insulating member 234, or may extend beyond the outer edge at any position along the circumference of the second insulating member 234.

[0115] The projection of the end cap 233 in a plane perpendicular to the arrangement direction X of the electrode assembly 22 and the end cap assembly 23 covers the projection of the second insulating member 234 in a plane perpendicular to the arrangement direction X of the electrode assembly 22 and the end cap assembly 23. The area between the outer peripheral surface 2331 of the end cap 233 and the outer edge of the second insulating member 234 is a connection area 2334. The blocking portion 231 on the end cap 233 is formed in the connection area 2334.

[0116] The blocking portion 231 is formed at the connection area 2334 where the end cap 233 extends beyond the second insulating member 234, reducing the risk of the blocking portion 231 interfering with the second insulating member 234 and causing the blocking portion 231 to fail to block the first connecting portion 241. Furthermore, the end cap 233 extends beyond the second insulating member 234, facilitating the connection between the outer circumference 2331 of the end cap and the inner circumference 212 of the housing, thereby reducing the risk of damage to the second insulating member 234 due to high temperatures during welding of the end cap 233 to the housing 21.

[0117] The blocking portion 231 may be formed in the connection area 2334 by opening a groove 235 in the connection area 2334. For example, referring to FIG5 , the connection area 2334 has a first surface 23341 facing the electrode assembly 22, and the first surface 23341 is provided with a groove 235. At least a portion of the groove side surface of the groove 235 forms the blocking portion 231.

[0118] The first surface 23341 is a portion of the surface of the end cap 233 that faces the electrode assembly 22. The groove 235 is recessed from the first surface 23341 in a direction away from the electrode assembly 22.

[0119] A groove 235 is provided on the first surface 23341 of the connection area 2334 facing the electrode assembly 22, and at least a portion of the groove side surface of the groove 235 forms a blocking portion 231, so that the formation method of the blocking portion 231 is relatively simple, and there is no need to separately provide the blocking portion 231 to occupy additional space inside the shell 21.

[0120] Of course, as shown in FIG. 7 , forming the blocking portion 231 in the connection area 2334 may also be formed by providing a first protrusion 29 on the first surface 23341 .

[0121] As shown in FIG8 and FIG9 , in some embodiments, the second insulating member 234 is formed with a blocking portion 231 .

[0122] The blocking portion 231 formed on the second insulating member 234 can be provided separately from the second insulating member 234, and then the second insulating member 234 and the blocking portion 231 are connected as a whole by welding, bonding, snap connection, etc. The material of the blocking portion 231 can be the same as or different from the material of the second insulating member 234.

[0123] The blocking portion 231 formed on the second insulating member 234 may also be integrally formed with the second insulating member 234 .

[0124] A blocking portion 231 is formed on the second insulating member 234, so that the blocking portion 231 can be further away from the connection position A between the end cover 233 and the shell 21, and can block the first connection portion 241 at a position farther away from the connection position A between the end cover 233 and the shell 21, further reducing the risk of the first connection portion 241 interfering with the connection between the end cover 233 and the shell 21.

[0125] There are many ways to form the blocking portion 231 on the second insulating member 234. As shown in FIG9 , a groove 235 is provided on the surface of the second insulating member 234 facing the electrode assembly 22. At least a portion of the side surface of the groove 235 forms the blocking portion 231.

[0126] The groove 235 on the second insulating member 234 is recessed from the surface of the second insulating member 234 facing the electrode assembly 22 toward a direction away from the electrode assembly 22 .

[0127] The groove 235 on the second insulating member 234 can have various shapes, such as a rectangular groove, a circular groove, etc., which is not limited in this application. For example, as shown in Figure 9, the groove 235 on the second insulating member 234 is a rectangular groove. The groove side surface of the groove 235 has two portions arranged oppositely along the first direction Y. Of the two portions of the groove side surface of the groove 235 that are opposite in the first direction Y, the one closer to the housing 21 forms the blocking portion 231.

[0128] During the connection process between the first connecting portion 241 and the second insulating member 234 and after the connection is completed, if the first connecting portion 241 extends too far toward the connection position A between the end cover assembly 23 and the shell 21, at least a portion of the groove side surface of the groove 235 will prevent the first connecting portion 241 from further extending toward the connection position A between the end cover assembly 23 and the shell 21.

[0129] A groove 235 is provided on the surface of the second insulating member 234 facing the electrode assembly 22, and at least a portion of the groove side surface of the groove 235 forms a blocking portion 231, so that the formation method of the blocking portion 231 is relatively simple, and there is no need to separately provide the blocking portion 231 to cause additional occupation of the internal space of the shell 21.

[0130] In other embodiments, as shown in Figures 10 and 11, a first protrusion 29 is provided on the surface of the second insulating member 234 facing the electrode assembly 22. The first protrusion 29 is a blocking portion 231 formed on the second insulating member 234. The first protrusion 29 and the second insulating member 234 can be provided separately, and then connected to the first protrusion 29 and the second insulating member 234 by welding, adhesive connection, snap connection, etc. The first protrusion 29 and the second insulating member 234 can also be integrally formed.

[0131] As shown in Figures 9 and 11, in some embodiments, the second insulating member 234 includes an insulating body 2341 and a second connecting portion 2342, the insulating body 2341 and the end cover 233 are stacked, the second connecting portion 2342 extends from the insulating body 2341 in a direction facing the electrode assembly 22, the first connecting portion 241 is connected to the outer side surface 23421 of the second connecting portion, and the insulating body 2341 is formed with a blocking portion 231.

[0132] Along the arrangement direction X of the electrode assembly 22 and the end cap assembly 23 , the surface of the second insulating member 234 facing the electrode assembly 22 is the surface of the insulating body 2341 facing the electrode assembly 22 .

[0133] The second connection portion 2342 extends from the insulating body 2341 in a direction facing the electrode assembly 22. The first connection portion 241 is connected to the outer side surface 23421 of the second connection portion, thereby providing a larger connection area between the first connection portion 241 and the second connection portion 2342, thereby improving the connection stability between the first connection portion 241 and the second connection portion 2342. The insulating body 2341 is formed with a blocking portion 231 to facilitate blocking the first connection portion 241 from extending toward the connection position A between the end cap assembly 23 and the housing 21.

[0134] As shown in FIG. 9 and FIG. 11 , in some embodiments, the insulating body 2341 includes an extension region 23412 protruding from an outer side surface 23421 of the second connecting portion, and the blocking portion 231 is formed in the extension region 23412 .

[0135] Along a direction perpendicular to the arrangement direction X of the electrode assembly 22 and the end cap assembly 23, the outer circumferential surface of the insulating body 2341 protrudes beyond the outer side surface 23421 of the second connecting portion. The insulating body 2341 may extend beyond a portion of the outer side surface 23421 of the second connecting portion, or may extend beyond the outer side surface at any position along the circumference of the second connecting portion 2342.

[0136] The projection of the insulating body 2341 in a plane perpendicular to the arrangement direction X of the electrode assembly 22 and the end cap assembly 23 covers the projection of the second connecting portion 2342 in a plane perpendicular to the arrangement direction X of the electrode assembly 22 and the end cap assembly 23. The area between the outer edge 23411 of the insulating body 2341 and the outer side surface 23421 of the second connecting portion is an extension region 23412. The blocking portion 231 on the second insulating member 234 is formed in the extension region 23412.

[0137] The blocking portion 231 is formed in an extension area 23412 of the insulating body 2341 beyond the second connection portion 2342 , reducing the risk of the blocking portion 231 interfering with the second connection portion 2342 and causing the blocking portion 231 to fail to block the first connection portion 241 .

[0138] One end of the second connection part 2342 is connected to the insulating body 2341, and extends from the insulating body 2341 to the inner side of the first connection part 241 facing the electrode assembly 22. When viewed along the direction X perpendicular to the arrangement direction of the electrode assembly 22 and the end cover assembly 23, the second connection part 2342 and the first connection part 241 are stacked, and the inner side surface 2412 of the first connection part is connected to the outer side surface 23421 of the second connection part.

[0139] The outer side surface 23421 of the second connecting portion may be coplanar with or non-coplanar with the outer edge 23411 of the insulating body. For example, along the first direction Y, the outer edge 23411 of the insulating body may protrude beyond the outer side surface 23421 of the second connecting portion, so that the outer side surface 23421 of the second connecting portion and the outer edge 23411 of the insulating body are not coplanar. Alternatively, along the first direction Y, the outer side surface 23421 of the second connecting portion may protrude beyond the outer edge 23411 of the insulating body, so that the outer side surface 23421 of the second connecting portion and the outer edge 23411 of the insulating body are not coplanar.

[0140] In the embodiment where the outer edge 23411 of the insulating body protrudes from the outer side surface 23421 of the second connecting portion, the outer edge of the second insulating member 234 is the outer edge 23411 of the insulating body, and the area of ​​the end cap 233 that exceeds the outer edge 23411 of the insulating body is the connecting area 2334.

[0141] In the embodiment where the outer side surface 23421 of the second connection portion protrudes beyond the outer edge 23411 of the insulating body, the outer edge of the second insulating member 234 is the outer side surface 23421 of the second connection portion, and the area where the end cover 233 extends beyond the outer side surface 23421 of the second connection portion is the connection area 2334.

[0142] The second connecting portion 2342 may be a closed loop structure that is enclosed along the circumference of the electrode assembly 22. The second connecting portion 2342 may be connected to the first connecting portion 241 at any position along the circumference of the insulating body 2341. In embodiments where the second connecting portion 2342 is a closed loop structure that is enclosed along the circumference of the electrode assembly 22, the outer contour of the second connecting portion 2342 is larger than the inner contour of the first connecting portion 241. Insertion of the second connecting portion 2342 within the space enclosed by the first connecting portion 241 causes the first connecting portion 241 to deform, which in turn causes the first connecting portion 241 to extend toward the connection location A between the end cap assembly 23 and the housing 21. This deformation can be understood as being caused by an interference fit between the first connecting portion 241 and the second connecting portion 2342. The blocking portion 231 also serves to prevent the first connecting portion 241 from extending toward the connection location A between the end cap assembly 23 and the housing 21 due to the fit between the first connecting portion 241 and the second connecting portion 2342.

[0143] The second connection portion 2342 may also be a non-closed loop structure extending along the circumference of the electrode assembly 22. In the embodiment in which the second connection portion 2342 is a non-closed loop structure extending along the circumference of the electrode assembly 22, the second insulating member 234 may include one second connection portion 2342 or may include multiple second connection portions 2342. In the embodiment in which the second insulating member 234 includes multiple second connection portions 2342, the multiple second connection portions 2342 are arranged at uniform or non-uniform intervals along the circumference of the electrode assembly 22. In the embodiment in which the second insulating member 234 includes multiple second connection portions 2342, a blocking portion 231 may be provided on the outside of the position where the first connection portion 241 overlaps with each second connection portion 2342, so as to prevent the connection position A between the first connection portion 241 and any second connection portion 2342 from extending toward the connection position A between the end cap assembly 23 and the shell 21.

[0144] The second connection part 2342 extends from the insulating body 2341 in a direction facing the electrode assembly 22, and the first connection part 241 is connected to the outer side surface 23421 of the second connection part, so that there is a larger connection area between the first connection part 241 and the second connection part 2342, which is beneficial to improving the connection stability of the first connection part 241 and the second connection part 2342.

[0145] The blocking portion 231 formed in the extension area 23412 can be formed by opening a groove 235 in the insulating body 2341. For example, please refer to Figure 9. In some embodiments, the second insulating member 234 includes an insulating body 2341 and a second connecting portion 2342. The insulating body 2341 and the end cover 233 are stacked, and the second connecting portion 2342 extends from the insulating body 2341 in a direction facing the electrode assembly 22. The first connecting portion 241 is connected to the outer side surface 23421 of the second connecting portion; the insulating body 2341 includes an extension area 23412 protruding from the outer side surface 23421 of the second connecting portion, and the groove 235 is formed in the extension area 23412.

[0146] Specifically, referring to FIG. 9 , the extension region 23412 has a second surface 23413 facing the first connection portion 241 . The second surface 23413 is provided with a groove 235 . At least a portion of a side surface of the groove 235 forms the blocking portion 231 .

[0147] The second surface 23413 is a portion of the surface of the insulating body 2341 (also known as the second insulating member 234 ) facing the electrode assembly 22 . The groove 235 is recessed from the second surface 23413 in a direction away from the electrode assembly 22 .

[0148] A groove 235 is provided on the second surface 23413 of the extension area 23412 facing the electrode assembly 22, and the groove 235 forms a blocking portion 231 close to the groove side of the shell 21, so that the formation method of the blocking portion 231 is relatively simple, and there is no need to set the blocking portion 231 separately to occupy additional internal space of the shell 21.

[0149] Of course, as shown in FIG. 11 , forming the blocking portion 231 in the extension region 23412 may also be formed by providing a first protrusion 29 on the second surface 23413 .

[0150] As shown in Figure 9, in an embodiment where a groove 235 is provided in the extension area 23412 of the second insulating member 234 to form a blocking portion 231, along the arrangement direction X of the electrode assembly 22 and the end cover assembly 23, the distance between the bottom surface of the groove 235 and the end of the blocking portion 231 close to the electrode assembly 22 is H1, and the distance between the surface of the insulating body 2341 facing the end cover 233 and the end of the second connecting portion 2342 facing the electrode assembly 22 is H2, satisfying: 0

[0151] H1 / H2 can be 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, etc.

[0152] If H1 / H2>1, the dimension of the blocking portion 231 along the arrangement direction X of the electrode assembly 22 and the end cover assembly 23 exceeds the dimension of the second connection portion 2342 along the arrangement direction X of the electrode assembly 22 and the end cover assembly 23, and exceeds the connection area of ​​the first connection portion 241 and the second connection portion 2342. Part of the blocking portion 231 cannot play the role of blocking the first connection portion 241, resulting in excess function and waste. Therefore, 0

[0153] Furthermore, 0.2

[0154] H1 / H2 can be 0.21, 0.23, 0.25, 0.35, 0.45, 0.55, 0.65, 0.75, 0.85, 0.9, etc.

[0155] ​​​If H1 / H2≤0.2, the size of the first connection part 241 along the arrangement direction X of the electrode assembly 22 and the end cover assembly 23 is relatively small, and it cannot effectively block the first connection part 241 from extending toward the connection position A between the end cover assembly 23 and the shell 21. If H1 / H2>0.9, the size of the portion of the blocking part 231 extending to the side of the first connection part 241 away from the second connection part 2342 is too large, resulting in inconvenient connection between the first connection part 241 and the second connection part 2342, affecting the connection quality. Therefore, 0.2

[0156] In an embodiment in which the second insulating member 234 includes an insulating body 2341 and a second connecting portion 2342, and a blocking portion 231 is formed on the second insulating member 234, the blocking portion 231 can also be formed on the second connecting portion 2342. As shown in Figures 12 and 13, the blocking portion 231 is connected to the outer side surface 23421 of the second connecting portion and partially extends between the connection position A between the end cover assembly 23 and the shell 21 and the first connecting portion 241.

[0157] As shown in Figures 5, 7, 9, 11, and 13, in some embodiments, the end cover assembly 23 includes an end cover 233, and the outer peripheral surface 2331 of the end cover is connected to the inner peripheral surface 212 of the shell to form a connection position A.

[0158] The outer circumferential surface 2331 of the end cap is the surface of the end cap 233 that is arranged along an axis parallel to the arrangement direction X of the electrode assemblies 22 and end cap assemblies 23, and is visible along a plane perpendicular to the arrangement direction X of the electrode assemblies 22 and end cap assemblies 23. The inner circumferential surface 212 of the housing is the inner surface of the housing 21 that is arranged along an axis parallel to the arrangement direction X of the electrode assemblies 22 and end cap assemblies 23. The inner circumferential surface 212 of the housing is arranged around the outer circumferential surface 2331 of the end cap. In any direction perpendicular to the arrangement direction X of the electrode assemblies 22 and end cap assemblies 23, the inner circumferential surface 212 of the housing is arranged opposite the outer circumferential surface 2331 of the end cap. When viewed along the arrangement direction X perpendicular to the electrode assemblies 22 and end cap assemblies 23, the area where the outer circumferential surface 2331 of the end cap overlaps the inner circumferential surface 212 of the housing forms the connection point A between the end cap assembly 23 and the housing 21.

[0159] ​Along the arrangement direction X of the electrode assembly 22 and the end cap assembly 23, at least a portion of the end cap 233 is accommodated within the housing 21. As shown in Figures 5, 7, 9, 11, and 13, along the arrangement direction X of the electrode assembly 22 and the end cap assembly 23, the end surface of the housing 21 having the opening 211 is flush with the surface of the end cap 233 facing away from the interior of the battery cell 20.

[0160] The connection between the end cover 233 and the shell 21 is achieved through the outer circumferential surface 2331 of the end cover and the inner circumferential surface 212 of the shell. Then, along the thickness direction of the end cover 233, at least a portion of the end cover 233 is accommodated in the shell 21, which is conducive to reducing the overall structural dimensions of the battery cell 20 along the thickness direction of the end cover 233.

[0161] In other embodiments, the end cap assembly 23 and the housing 21 may be connected in other directions to form the connection position A between the end cap assembly 23 and the housing 21. For example, as shown in Figures 14 and 15, the end cap 233 includes a cap body 2332 and an edge portion 2333. The cap body 2332 is disposed opposite the opening 211 of the housing 21. The edge portion 2333 is disposed around the periphery of the cap body 2332, and one end of the edge portion 2333 is connected to the cap body 2332. The edge portion 2333 is disposed around the periphery of the housing 21 and is connected to the outer peripheral surface 213 of the housing. The inner peripheral surface 23331 of the edge portion is connected to the outer peripheral surface 213 of the housing to form the connection position A between the end cap assembly 23 and the housing 21.

[0162] Of course, as shown in Figures 16 and 17, in other embodiments, the surface of the end cap 233 facing the electrode assembly 22 may be connected to the end surface of the housing 21 having the opening 211 to form a connection position A between the end cap assembly 23 and the housing 21. The dashed first connecting portion 241 abutting against the blocking portion 231 in Figure 17 illustrates a situation where the first connecting portion 241 extends significantly and can be blocked by the blocking portion 231.

[0163] In some embodiments, the blocking portion 231 is a closed-loop structure extending along the circumference of the electrode assembly 22 ; or, there are multiple blocking portions 231 , which are arranged at intervals along the circumference of the electrode assembly 22 .

[0164] Exemplarily, the battery cell 20 is a square-shell battery cell. Along the circumference of the electrode assembly 22, the battery cell 20 has a long side region and a short side region. The end cap assembly 23 may have a blocking portion 231 at positions corresponding to the long side region and the short side region. The blocking portions 231 located in the long side region and the blocking portions 231 located in the short side region are spaced apart along the circumference of the electrode assembly. Exemplarily, the second insulating member 234 has blocking portions 231 formed at positions corresponding to the long side region, and the second insulating member has blocking portions 231 formed at positions corresponding to the short side region. The blocking portions 231 of the second insulating member 234 located in the long side region and the blocking portions 231 of the second insulating member located in the short side region are spaced apart along the circumference of the electrode assembly 22. Alternatively, the blocking portion 231 may be provided only in the long side region or only in the short side region.

[0165] In some embodiments, along the circumference of the electrode assembly 22, the leading and trailing ends of the first insulating member 24 overlap and terminate at one side of the electrode assembly 22 located in the short side region, forming a tail overlapping portion of the first insulating member 24 (not shown), thereby completing the arrangement of the first insulating member 24 around the outer circumference of the electrode assembly 22. The tail overlapping portion can form a first connecting portion 241 of the first insulating member, and the end cap assembly 23 includes a blocking portion 231 for preventing the tail overlapping portion from extending to the connection position A between the end cap assembly 23 and the housing 21.

[0166] If the blocking portion 231 is a closed loop structure extending along the circumference of the electrode assembly 22, in an embodiment where a groove 235 is provided on the end cap 233 to form the blocking portion 231, the groove 235 is a closed loop groove extending along the circumference of the electrode assembly 22. In an embodiment where a first protrusion 29 is provided on the end cap 233 to form the blocking portion 231, the first protrusion 29 is a closed loop structure extending along the circumference of the electrode assembly 22.

[0167] In an embodiment where a groove 235 is provided on the second insulating member 234 to form the blocking portion 231, the groove 235 is a closed-loop groove extending along the circumference of the electrode assembly 22. In an embodiment where a first protrusion 29 is provided on the second insulating member 234 to form the blocking portion 231, the first protrusion 29 is a closed-loop structure extending along the circumference of the electrode assembly 22.

[0168] The blocking portion 231 is a closed-loop structure extending along the circumference of the electrode assembly 22. The blocking portion 231 can block the first connecting portion 241 from extending toward the connection position A between the end cover assembly 23 and the shell 21 at any position along the circumference of the electrode assembly 22, thereby achieving a better blocking effect.

[0169] Of course, the blocking portion 231 may also be a non-closed loop structure along the circumference of the electrode assembly 22. In the embodiment where the blocking portion 231 is a non-closed loop structure along the circumference of the electrode assembly 22, the number of the blocking portion 231 may be one or more.

[0170] If there are multiple blocking portions 231, the multiple blocking portions 231 are spaced apart along the circumference of the electrode assembly 22. In an embodiment where grooves 235 are provided on the end cap 233 to form the blocking portions 231, the multiple grooves 235 are spaced apart along the circumference of the electrode assembly 22, with at least a portion of the side surface of each groove 235 forming a blocking portion 231. In an embodiment where first protrusions 29 are provided on the end cap 233 to form the blocking portions 231, the multiple first protrusions 29 are spaced apart along the circumference of the electrode assembly 22, with each first protrusion 29 forming a blocking portion 231.

[0171] In an embodiment where grooves 235 are provided on the second insulating member 234 to form the blocking portion 231, a plurality of grooves 235 are spaced apart on the insulating body 2341 of the second insulating member 234 along the circumference of the electrode assembly 22, with at least a portion of the side surface of each groove 235 forming a blocking portion 231. In an embodiment where first protrusions 29 are provided on the second insulating member 234 to form the blocking portion 231, a plurality of first protrusions 29 are spaced apart on the insulating body 2341 of the second insulating member 234 along the circumference of the electrode assembly 22, with each first protrusion 29 forming a blocking portion 231.

[0172] If multiple blocking portions 231 are arranged at intervals along the circumference of the electrode assembly 22, the blocking portion 231 can be formed at a position where the first connecting portion 241 extends a large amount or in an area where the blocking portion 231 corresponds to the first connecting portion 241 and extends toward the connection position A. This can simplify the structure of the end cover assembly 23 and avoid waste caused by excessive functions of the blocking portion 231.

[0173] In the embodiment where the end cap assembly 23 includes an end cap 233 and a second insulating member 234, the blocking portion 231 may be formed only on the end cap 233, and the blocking portion 231 may not be formed on the second insulating member 234 (as shown in Figures 5, 7, and 14); the blocking portion 231 may also be formed only on the second insulating member 234, and the blocking portion 231 may not be formed on the end cap 233 (as shown in Figures 9 and 11) as shown in Figures 18 and 19, or the blocking portion 231 may be formed on both the end cap 233 and the second insulating member 234. In the embodiment where the insulating body 2341 has an extension area 23412 protruding from the outer side surface 23421 of the second connecting portion, the connecting area 2334 of the end cap 233 is the area where the end cap 233 extends beyond the outer edge 23411 of the insulating body.

[0174] Although the first connection portion 241 may extend during the connection process with the end cover assembly 23, it does not necessarily extend to the point where it abuts the blocking portion 231. The blocking effect of the blocking portion 231 on the first connection portion 241 can only be reflected when the extension amount of the first extension portion is large. The first connection portion 241 in dotted form abutting the blocking portion 231 in Figures 4-5 shows a situation where the first connection portion 241 extends a large amount and can be blocked by the blocking portion 231. The first connection portion 241 in solid form in Figure 5 is a situation where the first connection portion 241 extends a small amount and will not be blocked by the blocking portion 231. In the case where the first connection portion 241 extends a small amount, the first connection portion 241 may not be blocked by the blocking portion 231. Along the first direction, there is a distance between the first connection portion 241 and the blocking portion 231.

[0175] In an embodiment where the first connection portion 241 extends less and will not be blocked by the blocking portion 231, along the first direction Y, the blocking portion 231 includes a first blocking surface 2311 arranged facing the outer side surface 2411 of the first connection portion, and the distance between the outer side surface 2411 of the first connection portion and the first blocking surface 2311 is L1 (shown in Figure 5), and the distance between the outer side surface 2411 of the first connection portion and the inner circumferential surface 212 of the shell is L2 (shown in Figure 5), satisfying: 0.02≤L1 / L2<1.

[0176] After the first connecting portion 241 and the end cap assembly 23 are connected, along the first direction Y, the outer surface of the first connecting portion 241 is the surface of the first connecting portion 241 that is farthest from the electrode assembly 22 along the first direction Y, and the inner circumferential surface 212 of the housing is the surface of the housing 21 that is closest to the blocking portion 231 along the first direction Y. It should be noted that although the first direction Y can be any direction perpendicular to the arrangement direction X of the electrode assembly 22 and the end cap assembly 23, when measuring L1 and L2, they need to be measured in the same direction.

[0177] In an embodiment (shown in Figures 5 and 9) in which a groove 235 is provided on the surface of the end cover 233 and / or the insulating body 2341 facing the electrode assembly 22 and the groove side surface of the groove 235 includes a portion arranged opposite to the outer side surface 2411 of the first connecting part along the first direction Y, the portion of the groove side surface of the groove 235 arranged facing the outer side surface 2411 of the first connecting part along the first direction Y forms the blocking part 231, which is also the first blocking surface 2311 of the blocking part 231, and L1 is the distance between the portion of the groove side surface of the groove 235 arranged facing the outer side surface 2411 of the first connecting part along the first direction and the outer side surface 2411 of the first connecting part.

[0178] A first protrusion 29 is provided on the surface of the end cover 233 and / or the insulating body 2341 facing the electrode assembly 22. In an embodiment (shown in Figures 7 and 11) in which the first protrusion 29 forms the blocking portion 231, the first protrusion 29 has a surface provided along the first direction facing the outer side surface 2411 of the first connecting portion, which is the first blocking surface 2311 of the blocking portion 231, and L1 is the distance between the surface of the first protrusion 29 provided along the first direction facing the outer side surface 2411 of the first connecting portion and the outer side surface 2411 of the first connecting portion.

[0179] L1 / L2 can be 0.02, 0.05, 0.1, 0.15, 0.2, 0.25, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, etc.

[0180] If L1 / L2 is less than 0.02, the distance between the first connection part 241 and the blocking part 231 is too small, and the blocking part 231 is difficult to completely block the first connection part 241 from extending toward the connection position A between the end cover assembly 23 and the shell 21. L1 / L2>1 does not conform to the actual product design. Therefore, 0.02≤L1 / L2<1 enables the blocking part 231 to effectively block the first connection part 241 from extending toward the connection position A between the end cover assembly 23 and the shell 21 during and after the connection between the first connection part 241 and the end cover assembly 23, thereby reducing the risk of the first connection part 241 interfering with the connection between the shell 21 and the end cover assembly 23 and improving the connection quality between the shell 21 and the end cover assembly 23.

[0181] In some embodiments, 0.05≤L1 / L2≤0.75.

[0182] Illustratively, L1 / L2 can be 0.05, 0.07, 0.12, 0.17, 0.19, 0.22, 0.27, 0.29, 0.33, 0.36, 0.38, 0.42, 0.46, 0.48, 0.57, 0.67, 0.72, 0.75, etc.

[0183] If 0.05>L1 / L2≥0.02, the distance between the first connecting portion 241 and the blocking portion 231 is too small, and the blocking portion 231 may interfere with the connection between the end cover assembly 23 and the first connecting portion 241. If high temperature is generated during the connection between the first connecting portion 241 and the end cover assembly 23, the blocking portion 231 may also be melted by the high temperature. If 0.75<L1 / L2<1, the blocking portion 231 is close to the connection position A between the end cover assembly 23 and the shell 21 along the first direction Y. The blocking portion 231 may interfere with the connection between the end cover assembly 23 and the shell 21, and the blocking portion 231 is too far away from the first connecting portion 241, and cannot play a good role in blocking. The blocking portion 231 is blocked, therefore, 0.05≤L1 / L2≤0.75, which can reduce the risk of the blocking portion 231 interfering with the connection between the first connecting portion 241 and the end cover assembly 23, as well as the risk of high-temperature melting of the blocking portion 231 generated during the connection between the first connecting portion 241 and the end cover assembly 23, and reduce the risk of the blocking portion 231 interfering with the connection between the end cover assembly 23 and the shell 21, so that the first connecting portion 241 and the end cover assembly 23, as well as the end cover assembly 23 and the shell 21 can be connected with high quality, and the blocking portion 231 can effectively block the first connecting portion 241 from extending to the connection position A between the end cover assembly 23 and the shell 21.

[0184] An embodiment of the present application further provides a battery 100 , which includes the battery cell 20 provided in any of the above embodiments.

[0185] An embodiment of the present application further provides an electric device, which includes the battery 100 provided in the above embodiment.

[0186] The present embodiment provides a battery cell 20, which includes a housing 21, an electrode assembly 22, an end cap assembly 23, and a first insulating member 24. The end cap assembly 23 includes a cover body and a second insulating member 234. The outer circumferential surface 2331 of the end cap and the inner circumferential surface 212 of the housing are connected to form a connection point A between the end cap assembly 23 and the housing 21. Along the arrangement direction X of the electrode assembly 22 and the end cap assembly 23, the insulating body 2341 of the second insulating member 234 and the end cap 233 are stacked. The second connecting portion 2342 of the second insulating member 234 extends from the insulating body 2341 in a direction facing the electrode assembly 22 to the inner side of the first connecting portion 241. The outer side surface 23421 of the second connecting portion is connected to the inner side surface 2412 of the first connecting portion.

[0187] A groove 235 is provided on a first surface 23341 of the end cap 233, facing the electrode assembly 22, in a connection region 2334 extending beyond the outer edge of the second insulating member 234. At least a portion of the side surface of the groove 235 forms the blocking portion 231. Alternatively, a groove 235 is provided on a second surface 23413 of the insulating body 2341, facing the electrode assembly 22, in an extension region 23412 extending beyond the outer side surface 23421 of the second connecting portion. At least a portion of the side surface of the groove 235 forms the blocking portion 231.

[0188] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery cell, comprising: A housing having an opening; An electrode assembly received in the housing; An end cap assembly connected to the housing and configured to close the opening; A first insulating member disposed around the outer periphery of the electrode assembly, the first insulating member including a first connecting portion connected to the end cap assembly; Wherein, the end cap assembly includes a blocking portion configured to block the first connecting portion from extending to the connection position between the end cap assembly and the housing.

2. The battery cell according to claim 1, wherein, The blocking portion is located between the first connecting portion and the connection position.

3. The battery cell according to claim 1 or 2, wherein, The end cap assembly includes an end cap and a second insulating member. The end cap is connected to the housing to close the opening and form the connection position. The second insulating member is disposed on a side of the end cap facing the electrode assembly and is configured to separate the end cap and the electrode assembly. The first connecting portion is connected to the second insulating member.

4. The battery cell according to claim 3, wherein, The end cap forms the blocking portion.

5. The battery cell according to claim 3 or 4, wherein, A groove is provided on a surface of the end cap facing the electrode assembly, and at least a part of a side surface of the groove forms the blocking portion.

6. The battery cell according to claim 4 or 5, wherein The end cap includes a connection area extending beyond an outer edge of the second insulating member. The connection area is connected to the housing to form the connection position, and the blocking portion is formed in the connection area.

7. The battery cell according to any one of claims 3-6, wherein, The second insulating member forms the blocking portion.

8. The battery cell according to claim 7, wherein, A groove is provided on a surface of the second insulating member facing the electrode assembly, and at least a part of a side surface of the groove forms the blocking portion.

9. The battery cell according to claim 8, wherein, The second insulating member includes: An insulating body stacked with the end cap; A second connecting portion extending from the insulating body in a direction facing the electrode assembly. The first connecting portion is connected to an outer side surface of the second connecting portion; The insulating body includes an extending area protruding from the outer side surface of the second connecting portion, and the groove is formed in the extending area.

10. The battery cell according to claim 9, wherein, Along the arrangement direction of the end cap assembly and the electrode assembly, a distance between a bottom surface of the groove and one end of the blocking portion close to the electrode assembly is H1, and a distance between a surface of the insulating body facing the end cap and one end of the second connecting portion facing the electrode assembly is H2, satisfying: 0 < H1 / H2 ≤ 1.

11. The battery cell according to any one of claims 3-10, wherein, An outer peripheral surface of the end cap is connected to an inner peripheral surface of the housing to form the connection position.

12. The battery cell according to any one of claims 1-11, wherein, The blocking portion is a closed-loop structure extending along the circumference of the electrode assembly; or, the number of the blocking portions is multiple, and the multiple blocking portions are arranged at intervals along the circumference of the electrode assembly.

13. The battery cell according to any one of claims 1-12, wherein, Along the first direction, the blocking portion includes a first blocking surface disposed facing the outer side surface of the first connecting portion. The distance between the outer side surface of the first connecting portion and the first blocking surface is L1, and the distance between the outer side surface of the first connecting portion and the inner peripheral surface of the housing is L2 , satisfying: 0.02 ≤ L1 / L2 < 1, and the first direction is perpendicular to the arrangement direction of the electrode assembly and the end cover assembly.

14. A battery, comprising the battery cell according to any one of claims 1-13.

15. An electrical device, comprising the battery according to claim 14.

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