Battery monomer, battery device and electric equipment

Abstract

The embodiment of the utility model discloses a battery monomer, a battery device and electric equipment. The battery cell includes: a housing; the first electrode terminal is arranged on the shell and is electrically insulated from the shell; the electrode assembly is contained in the shell and comprises a first pole piece and a second pole piece which are opposite in polarity, the first pole piece and the second pole piece are alternately stacked in the thickness direction of the electrode assembly, the electrode assembly comprises two oppositely-arranged first end faces and two oppositely-arranged second end faces in the circumferential direction, and the area of the second end faces is larger than that of the first end faces; the first pole piece is provided with a first pole lug, the second pole piece is provided with a second pole lug, the first pole lug is electrically connected with the first electrode terminal, the second pole lug is electrically connected with the shell, and the second pole lug is located on the second end face. According to the battery monomer, the battery device and the electric equipment provided by the embodiment of the invention, the performance and the reliability of the battery monomer can be improved.

Description

Technical Field

[0001] The present application relates to the field of batteries, and more specifically, to a battery cell, a battery device and an electrical device. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. In this case, electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] In the development of battery technology, how to improve the performance of battery devices is an issue that cannot be ignored. Battery devices usually include multiple battery cells. Therefore, the performance of battery cells during the charging and discharging process directly affects the performance of the battery device. How to improve the performance of battery cells is a technical issue that needs to be solved urgently in the development of battery technology. Utility Model Content

[0004] The embodiments of the present application provide a battery cell, a battery device and an electrical equipment, which can improve the performance and reliability of the battery cell.

[0005] In a first aspect, a battery cell is provided, which includes: a shell; a first electrode terminal, which is arranged on the shell and electrically insulated from the shell; an electrode assembly, which is accommodated in the shell, and the electrode assembly includes a first pole sheet and a second pole sheet with opposite polarities, and the first pole sheet and the second pole sheet are alternately stacked along the thickness direction of the electrode assembly, and the circumference of the electrode assembly includes two oppositely arranged first end faces and two oppositely arranged second end faces, the area of the second end face is larger than the area of the first end face, the first pole sheet is provided with a first pole ear, and the second pole sheet is provided with a second pole ear, the first pole ear is electrically connected to the first electrode terminal, the second pole ear is electrically connected to the shell, and the second pole ear is located at the second end face.

[0006] Therefore, for the battery cell of the embodiment of the present application, the second end face where the second tab is located is not the end face with the smallest area of the electrode assembly. Compared with the case where the second tab is disposed on other end faces, on the one hand, the size of the second tab can be increased, thereby increasing the contact area between the second tab and the housing, reducing the impedance, reducing heat concentration, and contributing to improving the heat dissipation capacity of the battery cell; on the other hand, the potential difference of the electrode where the second tab is located can be reduced. Especially when the lengths of the edges of different end faces of the electrode assembly vary greatly, the potential difference can be effectively reduced, the energy loss during the charge and discharge process of the battery cell can be reduced, and the performance and reliability of the battery cell can be improved. Further, the first tab of the electrode assembly is electrically connected to the first electrode terminal of the battery cell, and the first electrode terminal is disposed on the housing but electrically insulated from the housing, while the second tab located on the second end face is electrically connected to the housing. On the one hand, the structure of the second tab can be simplified, and the connection components required for electrically connecting the second tab can be saved or simplified, thereby reducing the structural complexity of the battery cell; on the other hand, the housing can be used for heat dissipation, improving the heat dissipation capacity of the battery cell during use, and further improving the reliability of the battery cell.

[0007] In some embodiments, the electrode assembly includes at least one first tab and at least one second tab, and the total width of the at least one second tab is greater than the total width of the at least one first tab. On the one hand, the difference in the total width between the at least one second tab and the at least one first tab can improve the flexibility of the size design of the at least one first tab and the at least one second tab; on the other hand, increasing the size of the second tab can increase the contact area between the second tab and the housing, reduce the impedance, reduce heat concentration, and contribute to improving the heat dissipation capacity of the battery cell.

[0008] In some embodiments, along the width direction of the at least one second tab, the value range of the ratio of the total width of the at least one second tab to the width of the second end face is [0.5, 0.95]. Increasing the total width of the at least one second tab can improve the effect of potential balance, effectively increase the current-carrying area, reduce heat concentration, and contribute to heat dissipation. However, the ratio of the total width of the at least one second tab to the width of the second end face should be less than 0.95 to protect the second tab and reduce the influence of other components on the second tab.

[0009] In some embodiments, the first tab is located on the first end face, and the first end face and the second end face are different end faces of the electrode assembly, so as to reduce the interference between the first tab and the second tab, reduce the processing difficulty, and setting the first tab and the second tab on different end faces facilitates increasing the sizes of the first tab and the second tab to reduce heat concentration caused by current concentration, which is beneficial to heat dissipation.

[0010] In some embodiments, the first tab and the second tab are respectively located on two oppositely arranged second end faces. On the one hand, the size of the first tab can be increased, thereby increasing the contact area between the first tab and the outer shell, reducing the impedance, reducing heat concentration, and helping to improve the heat dissipation capacity of the battery cell. On the other hand, the potential difference of the electrode tab where the first tab is located can also be reduced, reducing the energy loss during the charge and discharge process of the battery cell, and improving the performance and reliability of the battery cell.

[0011] In some embodiments, a plurality of the second tabs are arranged on the second end face at intervals along the length direction of the electrode assembly, so as to reduce the potential difference of the electrode assembly and reduce the weight of the electrode assembly, thereby reducing the weight of the battery cell and the battery device and improving the energy density.

[0012] In some embodiments, a plurality of the second tabs are arranged on the second end face at intervals along the thickness direction of the electrode assembly, so as to further reduce the weight of the electrode assembly and reduce the weight of the battery cell and the battery device and improve the energy density.

[0013] In some embodiments, multiple columns of second tabs are arranged on the second end face along the length direction of the electrode assembly. Each column of the second tabs in the multiple columns includes a plurality of the second tabs arranged at intervals along the thickness direction of the electrode assembly, and adjacent columns of the second tabs in the multiple columns are arranged in a staggered manner. On the one hand, the weight of the electrode assembly can be reduced while reducing the potential difference of the electrode assembly, thereby reducing the weight of the battery cell and the battery device and improving the energy density. On the other hand, considering that the electrode assembly needs to be compacted when assembled into the inner part of the outer shell, the staggered arrangement can save the space occupied by the second tabs, improve the utilization rate of the internal space of the battery cell, and thus improve the energy density of the battery cell.

[0014] In some embodiments, the first tab is a positive tab and the second tab is a negative tab. Setting the negative tab on the second end face can reduce the potential difference of the negative electrode tab where the negative tab is located. Especially when the lengths of the edges of different end faces of the electrode assembly differ greatly, for example, when the second end face has the longest side of the electrode assembly and the length of the longest side of the electrode assembly differs greatly from the lengths of other sides, the potential difference can be effectively reduced. In addition, for lithium-ion batteries or sodium-ion batteries, etc., reducing the potential difference can reduce the metal precipitation phenomenon on the negative electrode tab, and can also reduce the energy loss during the charge and discharge process of the battery cell, and improve the performance and reliability of the battery cell.

[0015] In some embodiments, the electrode assembly further includes: a separator membrane for separating the first electrode tab and the second electrode tab. The height of the second electrode tab protruding from the separator membrane ranges from [3 mm, 8 mm]. Setting the height of the second electrode tab protruding from the separator membrane to be greater than or equal to 3 mm can increase the contact area between the second electrode tab and the housing, thereby enhancing the effect of current and potential balance and improving the reliability of the electrical connection between the second electrode tab and the housing. Conversely, setting the height of the second electrode tab protruding from the separator membrane to be less than or equal to 8 mm can reduce the excessive space occupied by the second electrode tab inside the battery cell, improve the energy density of the battery cell, and also reduce the weight of the electrode assembly, thereby reducing the weight of the battery cell and the battery device.

[0016] In some embodiments, the housing further includes: a housing body having an opening; a cover plate for covering the opening of the housing body. The cover plate is provided with the first electrode terminal, and the first electrode terminal is electrically insulated from the cover plate to facilitate processing and assembly.

[0017] In some embodiments, the cover plate is further provided with a second electrode terminal, and the second electrode terminal is electrically connected to the housing body through the cover plate. This is not only convenient for processing but also facilitates the electrical connection between multiple battery cells through the second electrode terminal and the first electrode terminal. For example, the electrical connection between multiple battery cells can be achieved by welding a busbar component to the second electrode terminal. Moreover, welding the busbar component to the second electrode terminal can also improve the connection stability and reliability between multiple battery cells.

[0018] In some embodiments, the second electrode tab is welded to the housing to improve the connection reliability between the second electrode tab and the housing, enhance the stability of the electrical connection between the second electrode tab and the housing, and thereby improve the reliability of the battery cell.

[0019] In a second aspect, a battery device is provided, including: the battery cell according to the first aspect or any one of the embodiments in the first aspect.

[0020] In a third aspect, an electrical device is provided, including: a battery device. The battery device includes the battery cell according to the first aspect or any one of the embodiments in the first aspect, and the battery device is used to supply power to the electrical device.

[0021] In some embodiments, the electrical device is a vehicle, a ship, or a spacecraft. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of a vehicle according to an embodiment of the present application;

[0023] Figure 2 Exploded structural schematic diagram of a battery device according to an embodiment of the present application;

[0024] Figure 3 Structural schematic diagram of a battery cell according to an embodiment of the present application;

[0025] Figure 4 Partial exploded structural schematic diagram of a battery cell according to an embodiment of the present application;

[0026] Figure 5 Structural schematic diagram of an electrode assembly according to an embodiment of the present application;

[0027] Figure 6 Side view schematic diagram of an electrode assembly according to an embodiment of the present application;

[0028] Figure 7 Top view schematic diagram of an electrode assembly according to an embodiment of the present application;

[0029] Figure 8 Cross-sectional schematic diagram of an electrode assembly according to an embodiment of the present application;

[0030] Figure 9 Cross-sectional schematic diagram of an electrode assembly according to another embodiment of the present application;

[0031] Figure 10 Structural schematic diagram of an electrode assembly according to another embodiment of the present application;

[0032] Figure 11 Side view schematic diagram of an electrode assembly according to another embodiment of the present application;

[0033] Figure 12 Structural schematic diagram of an electrode assembly according to yet another embodiment of the present application;

[0034] Figure 13 Side view schematic diagram of an electrode assembly according to yet another embodiment of the present application;

[0035] Figure 14 Cross-sectional schematic diagram of a battery cell according to an embodiment of the present application;

[0036] Figure 15 Partial enlarged cross-sectional schematic diagram of a battery cell according to an embodiment of the present application;

[0037] Figure 16 Cross-sectional schematic diagram of the cover plate of a battery cell according to an embodiment of the present application;

[0038] Figure 17 Exploded structural schematic diagram of the cover plate according to an embodiment of the present application;

[0039] Figure 18 Structural schematic diagram of a battery cell according to another embodiment of the present application;

[0040] Figure 19Schematic structural diagram of an electrode assembly according to another embodiment of the present application.

[0041] In the drawings, the drawings are not drawn to actual scale. Detailed implementation manners

[0042] The technical solutions in the embodiments of the present application will be described below with reference to the drawings.

[0043] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art without making creative efforts based on the embodiments in the present application belong to the scope of protection of the present application.

[0044] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs; the terms used in the description of the present application in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the description and claims of the present application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the description and claims of the present application or the above drawings are used to distinguish different objects and are not used to describe a specific order or primary-secondary relationship.

[0045] Referring to "embodiments" in the present application means that specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described in the present application can be combined with other embodiments.

[0046] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0047] In this application, the term "and / or" only describes the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, in this application, the character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0048] In the embodiments of this application, the same reference numerals represent the same components. For the sake of brevity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the thickness, length, width, etc. of various components shown in the drawings in the embodiments of this application, as well as the overall thickness, length, width, etc. of the integrated device, are only for illustrative purposes and should not constitute any limitation to this application.

[0049] The term "a plurality of" as used in this application means two or more (including two). Similarly, "a plurality of groups" means two or more groups (including two groups), and "a plurality of sheets" means two or more sheets (including two sheets).

[0050] In the embodiments of this application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging so that the active material can continue to be used.

[0051] The battery cell can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc. The embodiments of this application do not limit this.

[0052] In some implementation manners, the battery cell in the embodiments of this application can be a metal battery. Specifically, the metal battery can include a lithium metal secondary battery, a sodium metal battery, a magnesium metal battery, etc. The embodiments of this application do not limit this.

[0053] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can prevent the short circuit between the positive and negative electrodes and at the same time allow the active ions to pass through.

[0054] In some embodiments, the positive electrode can be a positive electrode sheet, and the positive electrode sheet can include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0055] As an example, the positive electrode current collector has two surfaces opposite to each other in its own thickness direction, and the positive electrode active material is disposed on any one or both of the two opposite surfaces of the positive electrode current collector.

[0056] As an example, the positive electrode current collector can be a metal foil, a foam metal, or a composite current collector. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium, etc. can be used. The foam metal can be foam nickel, foam copper, foam aluminum, foam alloy, or foam carbon, etc. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0057] As an example, the positive electrode active material can include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials can also be used. These positive electrode active materials can be used alone or in combination of two or more. Among them, examples of the lithium-containing phosphate can include but are not limited to lithium iron phosphate (such as LiFePO4 (which can also be abbreviated as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and at least one of a composite material of lithium manganese iron phosphate and carbon.

[0058] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative electrode current collector and a negative electrode active material provided on at least one surface of the negative electrode current collector.

[0059] As an example, the negative electrode current collector has two surfaces opposite to each other in its own thickness direction, and the negative electrode active material is provided on either one or both of the two opposite surfaces of the negative electrode current collector.

[0060] As an example, the negative electrode current collector can be a metal foil, a foam metal, or a composite current collector. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium, etc. can be used. The foam metal can be foam nickel, foam copper, foam aluminum, foam alloy, or foam carbon, etc. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (such as copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0061] In some embodiments, the electrode assembly further includes a separator, and the separator is disposed between the positive electrode and the negative electrode.

[0062] In some embodiments, the separator is a separator membrane. The present application does not particularly limit the type of the separator membrane, and any publicly known porous structure separator membrane with good chemical stability and mechanical stability can be selected.

[0063] As an example, the main material of the separator membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics.

[0064] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive electrode and the negative electrode, and simultaneously functions to transport ions and isolate the positive and negative electrodes.

[0065] In some embodiments, the battery cell further includes an electrolyte, and the electrolyte functions to conduct ions between the positive and negative electrodes. The present application does not specifically limit the type of the electrolyte, and it can be selected according to requirements. The electrolyte can be liquid, gel-like, or solid.

[0066] In some embodiments, the electrode assembly is provided with tabs, and the tabs can conduct current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0067] In some embodiments, the battery cell can include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc. The housing includes a shell body and an end cover.

[0068] The battery device mentioned in the embodiments of the present application can include one or more battery cells to provide a single physical module with a higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, parallel, or in a hybrid connection through a busbar component.

[0069] In some embodiments, the battery device can be a battery pack, and the battery pack includes a box body and battery cells, and the battery cells or battery modules are accommodated in the box body.

[0070] In some embodiments, the box body can be a part of the chassis structure of a vehicle. For example, a part of the box body can become at least a part of the floor of the vehicle, or a part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0071] In some embodiments, the battery device can be located in an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0072] The development of battery technology needs to consider various design factors simultaneously. For example, performance parameters such as energy density, cycle life, discharge capacity, charge-discharge rate, etc. Considering that the shapes of the electrode assemblies inside battery cells of different shapes are also different, setting tabs in different regions of the electrode assembly will affect the performance of the electrode assembly. For example, for a cuboid battery cell, the internal electrode assembly is usually also cuboid. Since the sizes of different end faces of the cuboid electrode assembly are different, the setting position of the tab of the electrode assembly will affect the performance of the battery cell.

[0073] The battery cell provided by the embodiment of the present application includes a housing, a first electrode terminal, and an electrode assembly. The first electrode terminal is disposed on the housing and is electrically insulated from the housing; the electrode assembly is accommodated in the housing. The electrode assembly includes a first pole piece and a second pole piece with opposite polarities, and the first pole piece and the second pole piece are alternately stacked along the thickness direction of the electrode assembly. The circumferential direction of the electrode assembly includes two relatively arranged first end faces and two relatively arranged second end faces, and the area of the second end face is larger than that of the first end face. The first pole piece is provided with a first tab, and the second pole piece is provided with a second tab, and the second tab is located on the second end face. In this way, the second end face where the second tab is located is not the end face with the smallest area of the electrode assembly. Compared with the case where the second tab is set on other end faces, on the one hand, the size of the second tab can be increased, thereby increasing the contact area between the second tab and the housing, reducing impedance, reducing heat concentration, and helping to improve the heat dissipation ability of the battery cell; on the other hand, it can reduce the potential difference of the pole piece where the second tab is located. Especially when the lengths of the edges of different end faces of the electrode assembly differ greatly, it can effectively reduce the potential difference and reduce the energy loss during the charge and discharge process of the battery cell, improving the performance and reliability of the battery cell.

[0074] Further, the first tab of the electrode assembly is electrically connected to the first electrode terminal of the battery cell. The first electrode terminal is disposed on the housing but is electrically insulated from the housing, while the second tab located on the second end face is electrically connected to the housing. On the one hand, it can simplify the structure of the second tab and save or simplify the connection components required for electrically connecting the second tab, thereby reducing the structural complexity of the battery cell; on the other hand, it can also utilize the housing for heat dissipation, improving the heat dissipation ability of the battery cell during use, and further improving the reliability of the battery cell.

[0075] The technical solutions described in the embodiments of the present application are applicable to various electrical equipment using battery devices.

[0076] The electrical equipment can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle, a spaceship, etc.; the electric toy includes a stationary or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and a railway electric tool, for example, an electric drill, an electric grinding wheel, an electric wrench, an electric screwdriver, a hammer drill, an impact electric drill, a concrete vibrator, a planer, etc. The embodiments of the present application do not impose special restrictions on the above electrical equipment.

[0077] For the convenience of description, the following embodiments will take the electrical equipment as a vehicle as an example for description.

[0078] For example, as Figure 1 shown, it is a schematic structural diagram of a vehicle 1 according to an embodiment of the present application. The vehicle 1 can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A motor 40, a controller 30 and a battery device 10 can be arranged inside the vehicle 1, and the controller 30 is used to control the battery device 10 to supply power to the motor 40. For example, the battery device 10 can be arranged at the bottom, the front end or the rear end of the vehicle 1. The battery device 10 can be used for power supply of the vehicle 1. For example, the battery device 10 can be used as the operating power source of the vehicle 1 and used for the circuit system of the vehicle 1, for example, for the working power requirements during the start, navigation and operation of the vehicle 1. In another embodiment of the present application, the battery device 10 can not only be used as the operating power source of the vehicle 1, but also be used as the driving power source of the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0079] For example. Figure 2 shows a partial schematic structural diagram of the battery device 10 according to an embodiment of the present application. As Figure 2 shown, the battery device 10 according to an embodiment of the present application can include a plurality of battery cells 20 to meet different power usage requirements. The shape of the battery cell 20 according to an embodiment of the present application can be set according to actual applications. For example, the battery cell 20 can be cylindrical as Figure 2 shown, or it can also be a cuboid different from Figure 2 shown or other shapes, and the embodiments of the present application are not limited thereto.

[0080] It should be understood that as Figure 2As shown, the battery device 10 of the embodiment of the present application may further include a box body 11, which can be used to accommodate a plurality of battery cells 20. The interior of the box body 11 of the embodiment of the present application is a hollow structure, and a plurality of battery cells 20 are accommodated in the box body 11. The box body 11 may include two parts, which are respectively referred to as a first box body part 111 and a second box body part 112, and the first box body part 111 and the second box body part 112 are snapped together. The shapes of the first box body part 111 and the second box body part 112 may be determined according to the shapes of the components accommodated inside, for example, according to the shape of the combination of a plurality of battery cells 20 accommodated inside. At least one of the first box body part 111 and the second box body part 112 has an opening. For example, as Figure 2 shown, the first box body part 111 and the second box body part 112 may both be hollow cuboids and each has a surface as an opening surface. The opening of the first box body part 111 and the opening of the second box body part 112 are arranged opposite to each other, and the first box body part 111 and the second box body part 112 are snapped together to form a box body 11 with a closed chamber, and this chamber can be used to accommodate a plurality of battery cells 20. A plurality of battery cells 20 are placed in parallel or in series or in a mixed connection combination inside the box body 11 formed after the first box body part 111 and the second box body part 112 are snapped together.

[0081] For another example, different from Figure 2 shown, only one of the first box body part 111 and the second box body part 112 may be a hollow cuboid with an opening, and the other may be plate-shaped to cover the opening. Taking the second box body part 112 as a hollow cuboid with an opening and the first box body part 111 as plate-shaped as an example, then the first box body part 111 covers the opening of the second box body part 112 to form a box body 11 with a closed chamber, and this chamber can be used to accommodate a plurality of battery cells 20.

[0082] In some embodiments, the battery device 10 may further include other components. For example, the battery device 10 may further include a busbar component, and the busbar component can be used to achieve electrical connection between a plurality of battery cells 20, such as in parallel or in series or in a mixed connection. Specifically, the busbar component can achieve electrical connection between battery cells 20 by connecting the electrode terminals 23 of the battery cells 20; or, the busbar component can also achieve electrical connection between battery cells 20 by connecting other components of the battery cells 20. The busbar component can be fixed to the corresponding components of the battery cells 20 by welding. For example, it can be fixed to the electrode terminals 23, the sealing structure or the housing, etc. The embodiment of the present application is not limited thereto.

[0083] Figure 3 shows a schematic structural diagram of the battery cell 20 of the embodiment of the present application; Figure 4 shows an exploded structural diagram of the outer shell 21 of the battery cell 20 of the embodiment of the present application. For example, Figure 4The shown housing 21 can be the housing 21 of the battery cell 20 as shown in Figure 3 The housing 21 of the battery cell 20; Figure 5 The structural schematic diagram of the electrode assembly 22 of the battery cell 20 according to the embodiment of the present application is shown. For example, Figure 5 The shown electrode assembly 22 can be Figure 3 The electrode assembly 22 included in the battery cell 20 shown; Figure 6 And Figure 7 The schematic diagrams of two different angles of the electrode assembly 22 of the battery cell 20 according to the embodiment of the present application are respectively shown. For example, Figure 6 And Figure 7 Can be respectively Figure 5 The schematic diagrams of different angles of the electrode assembly 22 shown.

[0084] In the embodiment of the present application, the battery cell 20 includes: a housing 21, a first electrode terminal 231, and an electrode assembly 22. Specifically, as Figures 3 to 7 Shown, the first electrode terminal 231 is disposed on the housing 21 and is electrically insulated from the housing 21; the electrode assembly 22 is accommodated in the housing 21. The electrode assembly 22 includes a first pole piece 225 and a second pole piece 226 with opposite polarities. The first pole piece 225 and the second pole piece 226 are alternately stacked along the thickness direction of the electrode assembly 22. The circumferential direction of the electrode assembly 22 includes two relatively arranged first end faces 2201 and two relatively arranged second end faces 2202. The area of the second end face 2202 is larger than the area of the first end face 2201. The first pole piece 225 is provided with a first pole tab 221, the second pole piece 226 is provided with a second pole tab 222. The first pole tab 221 is electrically connected to the first electrode terminal 231, and the second pole tab 222 is electrically connected to the housing 21. The second pole tab 222 is located on the second end face 2202.

[0085] It should be understood that the shape of the battery cell 20 according to the embodiment of the present application can be flexibly set according to actual applications, that is, the battery cell 20 can be any polyhedron structure. For example, it can be set as a cuboid or a cylinder, etc. Specifically, as Figures 3 to 7 Shown, the housing 21 of the battery cell 20 can include multiple walls so that the battery cell 20 is a polyhedron structure. Exemplarily, the housing 21 can be a cuboid or an approximate cuboid. The housing 21 can include six walls, and each wall is a rectangle or an approximate rectangle. In addition, the external shape of the battery cell 20 can be the same as or different from the shape of the electrode assembly 22 inside. For example, if the electrode assembly 22 is a cuboid structure, the housing 21 can usually also be a cuboid structure, but the embodiment of the present application is not limited thereto.

[0086] The embodiments of the present application are mainly described by taking the rectangular battery cell 20 as an example. In addition, for the convenience of description, three reference directions are defined in the embodiments of the present application. The thickness direction of the battery cell 20 is the direction Y, the height direction of the battery cell 20 is the direction Z, and the length direction of the battery cell 20 is the direction X. Among them, the thickness direction Y, height direction Z, and length direction X of the battery cell 20 are perpendicular to each other, and the size of the thickness direction Y of the battery cell 20 is smaller than the size of the length direction X.

[0087] It should be understood that the electrode assembly 22 in the embodiments of the present application is a component in the battery cell 20 where an electrochemical reaction occurs. According to actual usage requirements, one or more electrode assemblies 22 can be provided in the battery cell 20. For any one electrode assembly 22, the electrode assembly 22 includes a first electrode tab 225 and a second electrode tab 226 with opposite polarities, and the electrode assembly 22 is a stacked electrode assembly. Specifically, the first electrode tab 225 and the second electrode tab 226 are alternately stacked along the thickness direction of the electrode assembly 22, that is, the thickness direction of the electrode assembly 22 is the stacking direction of the electrode assembly 22. Here, the thickness direction of the electrode assembly 22 is taken as the thickness direction Y of the battery cell 20 as an example.

[0088] In the embodiments of the present application, the circumferential direction of the stacked electrode assembly 22 includes two relatively arranged first end faces 2201 and two relatively arranged second end faces 2202. Among them, the circumferential direction of the electrode assembly 22 is the direction around the stacking direction of the electrode assembly 22, and the first end face 2201 and the second end face 2202 in the circumferential direction of the electrode assembly 22 can be parallel to the stacking direction of the electrode assembly 22, or approximately parallel to the stacking direction of the electrode assembly 22, that is, the first end face 2201 and the second end face 2202 are not surfaces perpendicular to the stacking direction of the electrode assembly 22.

[0089] In the embodiments of the present application, the area of the second end face 2202 is larger than the area of the first end face 2201, that is, the second end face 2202 is not the end face with the smallest area of the electrode assembly 22. As Figures 3 to 7 shown, taking the electrode assembly 22 in the shape of a cuboid or approximately a cuboid as an example, when the second end face 2202 is not the end face with the smallest area, the second end face 2202 has the longest side 2203 of the electrode assembly 22.

[0090] It should be understood that the first pole piece 225 of the electrode assembly 22 in the embodiments of the present application is provided with a first pole tab 221. For example, the portion of the first pole piece 225 that is not coated with the active material layer is stacked to form the first pole tab 221. The second pole piece 226 is provided with a second pole tab 222. For example, the portion of the second pole piece 226 that is not coated with the active material layer is stacked to form the second pole tab 222. The first pole piece 225 and the second pole piece 226 in the embodiments of the present application have opposite polarities. Therefore, the first pole tab 221 and the second pole tab 222 also have opposite polarities. For example, the first pole tab 221 can be a positive pole tab, and the second pole tab is a negative pole tab; or, the first pole tab 221 can be a negative pole tab, and the second pole tab is a positive pole tab. The positive pole tab can be formed by stacking the portion of the positive pole piece that is not coated with the positive active material layer, and the negative pole tab can be formed by stacking the portion of the negative pole piece that is not coated with the negative active material layer. Moreover, the first pole tab 221 and the second pole tab 222 of the electrode assembly 22 in the embodiments of the present application can be located on the same or different end faces of the electrode assembly 22.

[0091] In the embodiments of the present application, the second pole tab 222 of the battery cell 20 is located on the second end face 2202. For the case where the second end face 2202 is not the end face with the smallest area of the electrode assembly 22, compared with the case of disposing the second pole tab 222 on other end faces, on the one hand, the size of the second pole tab 222 can be increased, thereby increasing the contact area between the second pole tab 222 and the housing 21, reducing the impedance, reducing heat concentration, and contributing to improving the heat dissipation capacity of the battery cell 20; on the other hand, the potential difference of the pole piece where the second pole tab 222 is located can be reduced. Especially when the lengths of the edges of different end faces of the electrode assembly 22 vary greatly, for example, when the second end face 2202 has the longest side 2203 of the electrode assembly 22 and the length of the longest side 2203 of the electrode assembly 22 varies greatly compared with the lengths of other sides, the potential difference can be effectively reduced, the energy loss during the charge and discharge process of the battery cell 20 can be reduced, and the performance and reliability of the battery cell 20 can be improved.

[0092] Furthermore, in the embodiments of the present application, the battery cell 20 can also be provided with an electrode terminal 23. The electrode terminal 23 is used to be electrically connected to the electrode assembly 22 to output the electric energy of the battery cell 20. Specifically, as Figures 3 to 7 shown, the battery cell 20 can include at least one first electrode terminal 231. The first electrode terminal 231 is disposed on the housing 21 but is electrically insulated from the housing. For example, the first electrode terminal 231 can be located at any position of the housing 21 of the battery cell 20, for example, it can be located on any one wall of the housing 21.

[0093] The first tab 221 of the electrode assembly 22 is electrically connected to the first electrode terminal 231 of the battery cell 20, while the second tab 222 located on the second end face 2202 is electrically connected to the housing 21. On the one hand, the structure of the second tab 222 can be simplified, and the connection components required for electrically connecting to the second tab 222 can be saved or simplified, thereby reducing the structural complexity of the battery cell 20; on the other hand, the housing 21 can also be used for heat dissipation, improving the heat dissipation capacity of the battery cell 20 during use, and thus improving the reliability of the battery cell 20.

[0094] Figure 8 and Figure 9 respectively show schematic cross-sectional views of different types of electrode assemblies 22. For example, the Figures 8 to 9 shown electrode assembly 22 can be the electrode assembly 22 included in the battery cell 20 of any embodiment of the present application. The cross-section is perpendicular to the length direction X of the battery cell 20, and for the sake of convenience of description, the tabs included in each electrode sheet are not shown here. As Figures 8 to 9 shown, the electrode assembly 22 of the embodiment of the present application is a stacked electrode assembly, and the specific structure of the electrode assembly 22 can be set according to actual applications. For example, the electrode assembly 22 of the embodiment of the present application can include a tab portion and a main electrode sheet portion 223. Specifically, the tab portion can include a positive tab and a negative tab. The positive tab can be formed by laminating the part of the positive electrode sheet that is not coated with the positive active material layer, and the part of the positive electrode sheet that is coated with the positive active material layer can form the main electrode sheet portion 223 by laminating; the negative tab can be formed by laminating the part of the negative electrode sheet that is not coated with the negative active material layer, and the part of the negative electrode sheet that is coated with the negative active material layer can form the main electrode sheet portion 223 by laminating.

[0095] In some embodiments, as Figure 8 shown, the electrode assembly 22 includes a plurality of first electrode sheets 225 and a plurality of second electrode sheets 226. The plurality of first electrode sheets are provided with first tabs 221, and the plurality of second electrode sheets are provided with second tabs 222; the plurality of first electrode sheets 225 and the plurality of second electrode sheets 226 are alternately laminated along the thickness direction of the electrode assembly 22. Since the plurality of first electrode sheets 225 and the plurality of second electrode sheets 226 are alternately laminated along the thickness direction of the electrode assembly 22, for any end face in the circumferential direction of the electrode assembly 22, it can be used to set the first tab 221 and the second tab 222, which is convenient for processing. For example, each of the two relatively arranged first end faces 2201 and the two relatively arranged second end faces 2202 of the electrode assembly 22 can be used to set the tabs.

[0096] For another example, as Figure 9As shown, the electrode assembly 22 includes a plurality of first electrode tabs 225 and second electrode tabs 226. The second electrode tab 226 may include at least one bent section and a plurality of stacked sections. Each bent section is used to connect two stacked sections. The plurality of first electrode tabs 225 and the plurality of stacked sections of the second electrode tab 226 are alternately stacked along the thickness direction of the electrode assembly 22 to form another stacked electrode assembly 22. Limited by the bent section of the second electrode tab 226, as Figure 9 shown, the second tab 222 of the electrode assembly 22 cannot be disposed on the end face where the bent section is located. For example, the second end face 2202 where the second tab 222 is located may be perpendicular to the bent section. The first tab 221 of the first electrode tab 225 is limited by the bent section of the second electrode tab 226. As long as the tab of each first electrode tab 225 does not extend toward the bent section of the second electrode tab 226, that is, the first tab 221 can be disposed on any end face in the circumferential direction of the electrode assembly 22.

[0097] Or, on the contrary, Figure 9 the electrode assembly 22 may further include a first electrode tab 225 and a plurality of second electrode tabs 226. The first electrode tab 225 includes at least one bent section and a plurality of stacked sections. The plurality of second electrode tabs 226 and the plurality of stacked sections of the first electrode tab 225 are alternately stacked along the thickness direction of the electrode assembly 22 to form another stacked electrode assembly 22. Then, limited by the bent section of the first electrode tab 225, the first tab 221 of the electrode assembly 22 cannot be disposed on the end face where the bent section is located. For example, the end face where the first tab 221 is located may be perpendicular to the bent section. The second tab 222 of the second electrode tab 226 is limited by the bent section of the first electrode tab 225. As long as the tab of each second electrode tab 226 does not extend toward the bent section of the first electrode tab 225, that is, the second tab 222 can be disposed on any end face in the circumferential direction of the electrode assembly 22.

[0098] It should be understood that the battery cell 20 of the embodiment of the present application further includes a separator 224, and the separator 224 is used to separate the first electrode tab 225 and the second electrode tab 226. The polarities of the first electrode tab 225 and the second electrode tab 226 in the embodiment of the present application are opposite. For example, if the first electrode tab 225 is a positive electrode tab, then the second electrode tab 226 is a negative electrode tab; if the first electrode tab 225 is a negative electrode tab, then the second electrode tab 226 is a positive electrode tab. Figures 8 to 9 In this case, mainly taking the first electrode tab 225 as the positive electrode tab and the second electrode tab 226 as the negative electrode tab as an example, the size of the positive electrode tab is set to be slightly smaller than the size of the negative electrode tab, which can reduce the phenomenon of lithium or sodium deposition for a lithium-ion battery cell or a sodium-ion battery cell, so as to improve the performance of the battery cell 20.

[0099] It should be understood that the first tab 221 and the second tab 222 in the embodiments of the present application have opposite polarities. In some embodiments, the first tab 221 is a positive tab, and the second tab 222 is a negative tab, that is, the negative tab is electrically connected to the housing 21, and the positive tab is electrically connected to the first electrode terminal 231. Setting the negative tab at the second end face 2202 can reduce the potential difference of the negative electrode tab where the negative tab is located. Especially when the lengths of the edges of different end faces of the electrode assembly 22 differ greatly. For example, when the second end face 2202 has the longest side 2203 of the electrode assembly 22, and the length of the longest side 2203 of the electrode assembly 22 differs greatly from the lengths of other sides, the potential difference can be effectively reduced; in addition, for lithium-ion batteries or sodium-ion batteries, etc., reducing the potential difference can reduce the phenomenon of metal precipitation on the negative electrode tab, and can also reduce the energy loss during the charge and discharge process of the battery cell 20, improving the performance and reliability of the battery cell 20.

[0100] In the embodiments of the present application, the second tab 222 is electrically connected to the housing 21. For example, the second tab 222 can be in direct contact with the housing 21 so that the second tab 222 is electrically connected to the housing 21, and no additional connection methods such as welding are required between the two, so as to simplify the processing process.

[0101] For another example, the second tab 222 is welded to the housing 21 to improve the connection reliability between the second tab 222 and the housing 21, improve the stability of the electrical connection between the second tab 222 and the housing 21, and further improve the reliability of the battery cell 20.

[0102] In the embodiments of the present application, the second tab 222 is located at the second end face 2202, and the first tab 221 can be located on the same end face as the second tab 222 or on a different end face.

[0103] In some embodiments, the first tab 221 and the second tab 222 are not located on the same end face of the electrode assembly 22 to reduce the interference between the first tab 221 and the second tab 222, reduce the processing difficulty, and setting the first tab 221 and the second tab 222 on different end faces facilitates increasing the sizes of the first tab 221 and the second tab 222 to reduce the heat concentration caused by current concentration, which is beneficial to heat dissipation.

[0104] In some embodiments, as Figures 3 to 9 shown, the first tab 221 is located at the first end face 2201. Considering that the first tab 221 is electrically connected to the first electrode terminal 231, the setting position of the first tab 221 can be related to the first electrode terminal 231; the first electrode terminal 231 is usually located on the wall with a smaller area of the housing 21, and correspondingly, the first tab 221 is located on the first end face 2201 with a smaller area to improve the integration of the battery cell 20 and facilitate processing.

[0105] In some embodiments, the first tab 221 and the second tab 222 are respectively located on two oppositely arranged second end faces 2202. On the one hand, the size of the first tab 221 can be increased, thereby increasing the contact area between the first tab 221 and the housing 21, reducing the impedance, reducing heat concentration, and helping to improve the heat dissipation capacity of the battery cell 20; on the other hand, the potential difference of the electrode sheet where the first tab 221 is located can also be reduced, reducing the energy loss during the charge and discharge process of the battery cell 20, and improving the performance and reliability of the battery cell 20.

[0106] In some embodiments, the electrode assembly 22 includes at least one first tab 221 and at least one second tab 222, and the total width L2 of the at least one second tab 222 is greater than the total width L1 of the at least one first tab 221. On the one hand, the difference between the total width L2 of the at least one second tab 222 and the total width L1 of the at least one first tab 221 can improve the flexibility of the size design of the at least one first tab 221 and the at least one second tab 222; on the other hand, increasing the size of the second tab 222 can increase the contact area between the second tab 222 and the housing 21, reduce the impedance, reduce heat concentration, and help to improve the heat dissipation capacity of the battery cell 20.

[0107] In some embodiments, along the width direction Z of the at least one second tab 222, the value range of the ratio of the total width L2 of the at least one second tab 222 to the width L0 of the second end face 2202 is [0.5, 0.95]. Increasing the total width L2 of the at least one second tab 222 can improve the effect of potential balance, effectively increase the current-carrying area, reduce heat concentration, and help with heat dissipation. However, the ratio of the total width L2 of the at least one second tab 222 to the width L0 of the second end face 2202 should be less than 0.95 to protect the second tab 222 and reduce the influence of other components on the second tab 222.

[0108] In some embodiments, along the width direction Z of the at least one second tab 222, the specific value of the ratio of the total width L2 of the at least one second tab 222 to the width L0 of the second end face 2202 can be any of the following values or any value between any two of the following values: 0.5, 0.53, 0.55, 0.58, 0.6, 0.63, 0.65, 0.68, 0.7, 0.73, 0.75, 0.78, 0.8, 0.83, 0.85, 0.88, 0.9, 0.93, and 0.95.

[0109] It should be understood that the calculation method of the total width L1 of at least one first tab 221 in the embodiment of the present application is related to the number of first tabs 221 included in the electrode assembly 22, and the calculation method of the total width L2 of at least one second tab 222 in the embodiment of the present application is related to the number of second tabs 222 included in the electrode assembly 22. For example, taking the second tab 222 as an example, as Figures 5 to 7 shown, if the electrode assembly 22 includes one second tab 222, and the dimension of this second tab 222 along its width direction Z is L2, then the total width L2 of at least one second tab 222 of this electrode assembly 22 is the width L2 of this one second tab 222. For another example, if the electrode assembly 22 includes multiple second tabs 222, then the total width L2 of at least one second tab 222 of the electrode assembly 22 is equal to the sum of the widths of these multiple second tabs 222.

[0110] It should be understood that if the electrode assembly 22 includes multiple second tabs 222, the arrangement manner of these multiple second tabs 222 can be set according to actual applications.

[0111] Figure 10 Fig. shows a schematic structural diagram of the electrode assembly 22 of the battery cell 20 in the embodiment of the present application. For example, Figure 10 it can be Figure 3 another possible schematic structural diagram of the electrode assembly 22 included in the battery cell 20 shown; Figure 11 Fig. shows a side view schematic diagram of the electrode assembly 22 of the battery cell 20 in the embodiment of the present application. For example, Figure 11 it can be Figure 10 a schematic diagram of another angle of the electrode assembly 22 shown.

[0112] In some embodiments, a plurality of second tabs 222 are arranged at intervals along the length direction Z of the electrode assembly 22, so as to reduce the potential difference of the electrode assembly 22 and reduce the weight of the electrode assembly 22, thereby reducing the weight of the battery cell 20 and the battery device 10 and improving the energy density. It should be understood that the length direction Z of the electrode assembly 22 is the extending direction Z of the longest side 2203 of the electrode assembly 22, and in the embodiment of the present application, the length direction Z of this electrode assembly 22 is taken as the length direction Z of the battery cell 20 as an example.

[0113] In some embodiments, the widths of different second tabs 222 among the plurality of second tabs 222 arranged at intervals along the length direction Z of the electrode assembly 22 can be the same or different. For example, if the widths of different second tabs 222 among the plurality of second tabs 222 arranged at intervals along the length direction Z of the electrode assembly 22 are the same, as Figure 10 and Figure 11As shown, taking the width of each second tab 222 as L3 for example, the total width L2 of at least one second tab 222 is equal to the product of the number of multiple second tabs 222 spaced apart along the length direction Z of the electrode assembly 22 and the width L3. For another example, if the widths of different second tabs 222 among the multiple second tabs 222 spaced apart along the length direction Z of the electrode assembly 22 are different, the total width L2 of at least one second tab 222 is equal to the sum of the widths of the multiple second tabs 222.

[0114] In some embodiments, a plurality of second tabs 222 are disposed on the second end face 2202 at intervals along the thickness direction Y of the electrode assembly 22, so as to reduce the weight of the electrode assembly 22, and reduce the weights of the battery cell 20 and the battery device 10, and improve the energy density. It should be understood that the thickness direction Y of the electrode assembly 22 is the stacking direction of the electrode assembly 22 and is perpendicular to the extending direction Z of the longest side 2203 of the electrode assembly 22; in addition, in the embodiments of the present application, the thickness direction Y of the electrode assembly 22 is taken as the thickness direction Y of the battery cell 20 as an example.

[0115] Figure 12 The structural schematic diagram of the electrode assembly 22 of the battery cell 20 according to the embodiment of the present application is shown. For example, Figure 12 It can be Figure 3 Another possible structural schematic diagram of the electrode assembly 22 included in the battery cell 20 shown as Figure 13 The side view schematic diagram of the electrode assembly 22 of the battery cell 20 according to the embodiment of the present application is shown. For example, Figure 13 It can be Figure 12 The schematic diagram of another angle of the electrode assembly 22 shown as

[0116] In some embodiments, multiple columns of second tabs 222 are disposed on the second end face 2202 along the length direction Z of the electrode assembly 22. Each column of second tabs 222 in the multiple columns of second tabs 222 includes multiple second tabs 222 spaced apart along the thickness direction Y of the electrode assembly 22, and two adjacent columns of second tabs 222 in the multiple columns of second tabs 222 are staggeredly distributed. Specifically, as Figure 12 and Figure 11As shown, a plurality of rows of second tabs 222 are provided on the second end face 2202 and are distributed along the length direction Z of the electrode assembly 22. If one row of second tabs 222 is identified as a second tab row 2221, then a plurality of second tab rows 2221 are provided on the second end face 2202 and are distributed along the length direction Z of the electrode assembly 22. For any second tab row 2221, it includes a plurality of second tabs 222 that are spaced apart along the thickness direction Y of the electrode assembly 22. For example, each second tab row 2221 may include a plurality of second tabs 222 that are distributed along the thickness direction Y of the electrode assembly 22. Moreover, the number of second tabs 222 included in different second tab rows 2221 among the plurality of second tab rows 2221 may be the same or different.

[0117] As Figure 12 and Figure 13 shown, for any two adjacent second tab rows 2221, the second tabs 222 they include are staggeredly distributed. For example, they are staggeredly distributed in the length direction Z of the electrode assembly 22 and are also staggeredly distributed in the thickness direction Y of the electrode assembly 22. In this way, on the one hand, while reducing the potential difference of the electrode assembly 22, the weight of the electrode assembly 22 can be reduced, and further the weights of the battery cell 20 and the battery device 10 can be reduced, improving the energy density. On the other hand, considering that when the electrode assembly 22 is assembled into the interior of the housing 21, it needs to undergo a compaction process. The staggered distribution can save the space occupied by the second tabs 222, improve the utilization rate of the internal space of the battery cell 20, and further improve the energy density of the battery cell 20.

[0118] Figure 14 shows a cross-sectional schematic diagram of the battery cell 20 according to an embodiment of the present application. For example, this Figure 14 may be a cross-sectional schematic diagram of the battery cell 20 as Figures 3 to 4 shown, and this cross-section is perpendicular to the height direction Z of the battery cell 20. Figure 15 shows a partial cross-sectional schematic diagram of the battery cell 20 according to an embodiment of the present application. For example, this Figure 15 may be a Figure 14 partial enlarged view of region A. As Figure 14 and Figure 15 shown, the electrode assembly 22 after being compacted is located inside the housing 21. For the electrode assembly 22 after being compacted, the tabs will have local bending or curving. For example, the second tab 222 will bend along the thickness direction Y of the electrode assembly 22 after being compacted. Therefore, for as Figures 12 to 13The shown electrode assembly 22 has gaps between multiple second tab ears 222 with misaligned distribution. After being compacted, these gaps can be used to accommodate the bent second tab ears 222, reducing the space occupied by the second tab ears 222 in the thickness direction Y of the electrode assembly 22, improving the utilization rate of the internal space of the battery cell 20, and further increasing the energy density of the battery cell 20.

[0119] In the embodiment of the present application, the electrode assembly 22 further includes: a separator film 224 for separating the first electrode plate 225 and the second electrode plate 226.

[0120] In some embodiments, the size of the second tab ear 222 in the embodiment of the present application can be set according to actual applications. For example, the value range of the height L4 of the second tab ear 222 protruding from the separator film 224 is [3 mm, 8 mm]. Setting the height L4 of the second tab ear 222 protruding from the separator film 224 to be greater than or equal to 3 mm can increase the contact area between the second tab ear 222 and the outer shell 21, thereby increasing the effect of current and potential balance, and can also improve the reliability of the electrical connection between the second tab ear 222 and the outer shell 21; conversely, setting the height L4 of the second tab ear 222 protruding from the separator film 224 to be less than or equal to 8 mm can reduce the excessive space occupied by the second tab ear 222 inside the battery cell 20 to increase the energy density of the battery cell 20. Additionally, it can reduce the weight of the electrode assembly 22, and further reduce the weight of the battery cell 20 and the battery device 10.

[0121] In some embodiments, the value of the height L4 of the second tab ear 222 protruding from the separator film 224 can be any of the following values or between any two of the following values: 3 mm, 3.3 mm, 3.5 mm, 3.8 mm, 4 mm, 4.3 mm, 4.5 mm, 4.8 mm, 5 mm, 5.3 mm, 5.5 mm, 5.8 mm, 6 mm, 6.3 mm, 6.5 mm, 6.8 mm, 7 mm, 7.3 mm, 7.5 mm, 7.8 mm, and 8 mm.

[0122] In the embodiment of the present application, the size of the first tab ear 221 can also be set according to actual applications. For example, the height L5 of the first tab ear 221 protruding from the separator film 224 is generally greater than the height L4 of the second tab ear 222 protruding from the separator film 224 to facilitate the electrical connection between the first tab ear 221 and the first electrode terminal 231. For another example, taking the electrical connection between the first tab ear 221 and the first electrode terminal 231 through the connecting member 25 as an example, the value range of the height L5 of the first tab ear 221 protruding from the separator film 224 can be set to [20 mm, 30 mm] for easy assembly.

[0123] It should be understood that for the electrode assembly 22 after being compacted, the tab may have local bending or curving. For example, after being compacted, the second tab 222 will bend along the thickness direction Y of the electrode assembly 22, and the straight height L6 of the bent second tab 222 exceeding the separator 224 is less than the height L4 before bending. For example, as Figure 14 and Figure 15 shown, the value range of the straight height L5 of the bent second tab 222 exceeding the separator 224 is generally [0.8 mm, 2 mm], but the embodiments of the present application are not limited thereto.

[0124] In the embodiments of the present application, the housing 21 of the battery cell 20 may include a housing body 211 and a cover plate 212. Specifically, the housing body 211 has an opening 2111. For example, the electrode assembly 22 is accommodated in the housing body 211 through the opening 2111; the cover plate 212 is used to cover the opening 2111 of the housing body 211 to isolate the external environment.

[0125] Figure 16 shows a cross-sectional schematic diagram of the cover plate 212 of the embodiments of the present application. For example, the Figure 16 shown cover plate 212 may be the cover plate 212 of the battery cell 20 as shown in Figure 3 and Figure 4 shown, and this cross-section is perpendicular to the thickness direction Y of the battery cell 20. Figure 17 shows an exploded structural schematic diagram of the cover plate 212 of the embodiments of the present application. For example, the Figure 17 shown cover plate 212 may be the exploded structure of the cover plate 212 as shown in Figure 14 shown. As Figure 16 and Figure 17 shown, the housing body 211 of the embodiments of the present application may be a hollow structure with an opening 2111 formed at at least one end, and the shape of the cover plate 212 may be adapted to the shape of the housing body 211. The cover plate 212 is used to cover the opening 2111 of the housing body 211 so that the housing 21 isolates the internal environment of the battery cell 20 from the external environment. For example, if the housing body 211 is a hollow structure with an opening 2111 formed at one end, the cover plate 212 may be provided as one; or, differently, the housing body 211 may be a hollow structure with openings 2111 formed at opposite ends, so as to facilitate the internal electrode assembly 22 to enter the housing interior from either side, improving the installation efficiency. And correspondingly, the cover plate 212 may be provided as two, and the two cover plates 212 respectively cover the openings 2111 at both ends of the housing body 211, but the embodiments of the present application are not limited thereto.

[0126] The material of the housing 211 in the embodiments of the present application may include one or more types. For example, it may include copper, iron, aluminum, steel, aluminum alloy, etc. The material of the cover plate 212 may also be one or more types. For example, it may include copper, iron, aluminum, steel, aluminum alloy, etc. Among them, the material of the cover plate 212 may be the same as or different from the material of the housing 211; the materials of different walls of the housing 211 may also be the same or different.

[0127] In some embodiments, for a sodium-ion battery cell, the current collectors of the positive electrode tab and the negative electrode tab included in the electrode assembly 22 may both be made of aluminum foil. The positive electrode tab of the positive electrode tab and the negative electrode tab of the negative electrode tab may both be electrically connected to the housing 211, and the material of the housing 211 may be aluminum or steel. For a lithium-ion battery cell, if the material of the housing 211 is aluminum, lithium ions are likely to form a lithium-aluminum alloy with the aluminum shell. Therefore, when the second tab 222 of the electrode assembly 22 of the lithium-ion battery is electrically connected to the housing 211, the material of the housing 211 generally cannot be aluminum.

[0128] The shapes of the housing 211 and the cover plate 212 in the embodiments of the present application cooperate with each other. For example, as Figure 16 and Figure 17 shown, the housing 211 may be an approximate cuboid structure, and the cover plate 212 is an approximate rectangular plate-like structure adapted to the housing 211. The cover plate 212 may be any wall of the outer shell 21. For example, the cover plate 212 may be the wall with the largest area, or the smallest area, or other walls among the multiple walls included in the outer shell 21. The embodiments of the present application are not limited thereto. Alternatively, the cover plate 212 may also be other structures. For example, the cover plate 212 may also be a groove structure with an opening to cover the opening 2111 of the housing 211 with the opening of the cover plate 212. The embodiments of the present application are not limited thereto.

[0129] For the convenience of description, the present application mainly takes the outer shell 21 as an approximate cuboid as shown in Figures 3 to 4 ; the housing 211 is a hollow structure with one end open. Correspondingly, as shown in Figure 16 and Figure 17 shown, by covering the opening 2111 of the housing 211 with the cover plate 212 with an approximately rectangular surface provided, for example, through welding, a sealed connection between the housing 211 and the cover plate 212 can be achieved to form a closed cavity for placing the electrode assembly 22 and improve the sealing reliability.

[0130] In some embodiments, as shown in Figure 16 and Figure 17 shown, the cover plate 212 in the embodiments of the present application may include a top cover sheet 2121 and a bracket 2122. The bracket 2122 is used to support the top cover sheet 2121 and the components provided on the cover plate 212.

[0131] In an embodiment of the present application, the first electrode terminal 231 is disposed on the outer shell 21, and the first electrode terminal 231 may be located on any wall of the outer shell 21. For example, the cover plate 212 is provided with the first electrode terminal 231, and the first electrode terminal 231 is electrically insulated from the cover plate 212 to facilitate processing and assembly. As Figure 16 and Figure 17 shown, the first electrode terminal 231 of the embodiment of the present application is used to be electrically connected to the first tab 221. For example, the first electrode terminal 231 may be electrically connected to the first tab 221 through a connecting member 25. The first electrode terminal 231 may be a positive electrode terminal, then the first tab 221 is a positive tab; on the contrary, the first electrode terminal 231 may be a negative electrode terminal, then the first tab 221 is a negative tab.

[0132] It should be understood that the structure of the first electrode terminal 231 of the embodiment of the present application may be set according to actual applications. For example, as Figure 16 and Figure 17 shown, the cover plate 212 may include a first electrode lead-out hole 2123 corresponding to the first electrode terminal 231, and the first electrode terminal 231 is electrically connected to the first tab 221 below through the first electrode lead-out hole 2123. For example, at least a part of the first electrode terminal 231 may be received in the first electrode lead-out hole 2123, but the embodiment of the present application is not limited thereto.

[0133] As Figure 16 and Figure 17 shown, the first electrode terminal 231 may include a first pole column 2311 and a first fixing structure 2312. The first pole column 2311 is fixed to the cover plate 212 through the first fixing structure 2312. For example, the first fixing structure 2312 may be a riveting block, and the first pole column 2311 is riveted to the cover plate 212 through the riveting block.

[0134] Furthermore, the first electrode terminal 231 further includes an insulating member for electrically insulating the first electrode terminal 231 from the cover plate 212. For example, the insulating member may include a first insulating structure 2313 and a second insulating structure 2314, and electrical insulation between the first electrode terminal 231 and the cover plate 212 is achieved through the first insulating structure 2313 and the second insulating structure 2314.

[0135] It should be understood that the second tab 222 of the embodiment of the present application is electrically connected to the outer shell 21. For example, the second tab 222 may be in contact with any wall of the housing 211 to achieve electrical connection with the housing 211.

[0136] In some embodiments, the battery cell 20 of the embodiments of the present application may further include a second electrode terminal 232, which is electrically connected to the housing 211 and further to the second tab 222 to output electrical energy. For example, the second electrode terminal 232 may be a positive electrode terminal, and the second tab 222 is a positive tab; conversely, the second electrode terminal 232 may be a negative electrode terminal, and the second tab 222 is a negative tab. The second electrode terminal 232 is electrically connected to the second tab 222 through the housing 211, which can save connection components and simplify the structure of the battery cell 20. This can not only reduce the weight of the battery cell 20 but also facilitate the processing and assembly of the battery cell 20. In addition, the second electrode terminal 232 can also be used to realize the electrical connection between multiple battery cells 20. For example, the electrical connection between multiple battery cells 20 is realized by welding a bus bar component to the second electrode terminal 232. Moreover, welding the bus bar component to the second electrode terminal 232 can also improve the connection stability and reliability between multiple battery cells 20.

[0137] It should be understood that the second electrode terminal 232 of the embodiments of the present application can be located on any wall of the battery cell 20; and the second electrode terminal 232 can be located on the same or different walls as the first electrode terminal 231. For example, the second electrode terminal 232 can be arranged on the same wall as the first electrode terminal 231 to facilitate processing and assembly.

[0138] In some embodiments, the cover plate 212 is also provided with a second electrode terminal 232. The second electrode terminal 232 is electrically connected to the housing 211 through the cover plate 212. Arranging both the second electrode terminal 232 and the first electrode terminal 231 on the cover plate 212 not only facilitates processing but also facilitates the electrical connection between multiple battery cells 20 through the second electrode terminal 232 and the first electrode terminal 231.

[0139] It should be understood that the structure of the second electrode terminal 232 of the embodiments of the present application can be set according to actual applications. For example, as Figure 16 and Figure 17 shown, the cover plate 212 may include a second electrode lead-out hole 2124 corresponding to the second electrode terminal 232. For example, at least a part of the second electrode terminal 232 can be received in the second electrode lead-out hole 2124, but the embodiments of the present application are not limited thereto.

[0140] As Figure 16 and Figure 17As shown, the second electrode terminal 232 may include a second pole column 2321 and a second fixing structure 2322. The second pole column 2321 is fixed to the cover plate 212 through the second fixing structure 2322. For example, the second fixing structure 2322 may be a riveting block, and the second pole column 2321 is riveted and electrically connected to the cover plate 212 through the riveting block, and is further electrically connected to the housing through the cover plate 212 to realize electrical connection with the second tab 222.

[0141] In some embodiments, the cover plate 212 may further be provided with other structures. For example, the battery cell 20 may further include a pressure relief mechanism 24. For example, the pressure relief mechanism 24 may be disposed on the cover plate 212. The pressure relief mechanism 24 refers to an element or component that is actuated when the internal pressure or temperature of the battery cell 20 reaches a predetermined threshold to release the internal pressure or temperature. The threshold design varies according to different design requirements. The threshold may depend on one or several of the materials of the positive electrode plate, negative electrode plate, electrolyte, and separator in the battery cell 20.

[0142] As used in this application, "actuate" means that the pressure relief mechanism 24 generates an action or is activated to a certain state, so that the internal pressure and temperature of the battery cell 20 can be released. The actions generated by the pressure relief mechanism 24 may include, but are not limited to: at least a part of the pressure relief mechanism 24 rupturing, breaking, being torn, or opening, etc. When the pressure relief mechanism 24 is actuated, the high-temperature and high-pressure substances inside the battery cell 20 will be discharged outward from the actuated part as emissions. In this way, the battery cell 20 can be depressurized and cooled under controllable pressure or temperature, thereby avoiding potential more serious accidents.

[0143] The emissions from the battery cell 20 mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of the separator, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0144] It should be understood that the structure of the pressure relief mechanism 24 in the embodiments of this application can be set according to actual applications. For example, the pressure relief mechanism 24 may include a pressure relief sheet 241, and the pressure relief sheet 241 may be provided with a notch so that when the internal pressure or temperature of the battery cell 20 reaches a predetermined threshold, the notch of the pressure relief sheet 241 is damaged to timely release the internal pressure of the battery cell 20. The pressure relief mechanism 24 may further include a protection sheet 242 to protect the pressure relief sheet 241 and improve the service life of the pressure relief mechanism 24.

[0145] In some embodiments, the battery cell 20 may also be provided with only the first electrode terminal 231 without the second electrode terminal 232. Figure 18 The structural schematic diagram of the battery cell 20 according to another embodiment of this application is shown, as Figure 18As shown, the battery cell 20 may include at least one first electrode terminal 231 and does not include a second electrode terminal 232. As will be Figure 18 shown, when a plurality of battery cells 20 are electrically connected, the electrical connection between the two battery cells 20 can be achieved by directly connecting the first electrode terminal 231 of one battery cell 20 to the housing 211 of another battery cell 20. This can reduce the number of electrode terminals of the battery cell 20, which is convenient for processing, simplifies the structure, and further reduces the weight of the battery cell 20.

[0146] It should be understood that in the above description, it is mainly described by taking the second end face 2202 where the second tab 222 is located as not the smallest end face area of the electrode assembly 22. Alternatively, differently, the second end face 2202 where the second tab 222 of the electrode assembly 22 is located may also be other end faces of the electrode assembly 22.

[0147] Figure 19 The structural schematic diagram of the electrode assembly 22 according to another embodiment of the present application is shown. As Figure 19 shown, the electrode assembly 22 includes a first tab 221 and a second tab 222 with opposite polarities. Among them, the electrode assembly 22 includes a plurality of second tabs 222 located on different end faces. The first tab 221 is electrically connected to the first electrode terminal 231 of the battery cell 20, and the plurality of second tabs 222 are all electrically connected to the housing 21 of the battery cell 20. By arranging the second tabs 222 on multiple end faces of the electrode assembly 22, the overcurrent area can be effectively increased, the charge and discharge rate of the battery cell 20 can be improved, the heat dissipation performance can be improved, and thus the performance and reliability of the battery cell 20 can be improved. In addition, for electrode assemblies 22 of different sizes, arranging the second tabs 222 on multiple end faces can also reduce the potential difference of the electrode assembly 22, reduce the energy loss during the charge and discharge process of the battery cell 20, and improve the performance and reliability of the battery cell 20.

[0148] In some embodiments, taking the first tab 221 located on the first end face 2201 and the second tab 222 located on the second end face 2202 as an example, as Figure 19 shown, the electrode assembly 22 may include a plurality of second end faces 2202, and the plurality of second end faces 2202 may intersect or be opposite to each other. The second end face 2202 and the first end face 2201 may be the same end face or different end faces. For example, Figure 19 taking the electrode assembly including two relatively arranged second end faces 2202 as an example, the two second end faces 2202 are arranged along the extension direction of the longest side 2203 of the electrode assembly 22 to reduce the potential difference of the electrode assembly 22; Figure 19 in [description], the second end face 2202 and the first end face 2201 are different end faces to reduce the mutual influence between the first tab 221 and the second tab 222.

[0149] It should be understood that for any second end face 2202 of the electrode assembly 22, the manner of arranging the second tab 222 can refer to the relevant description in Figures 5 to 13 For the sake of brevity, it will not be elaborated here one by one.

[0150] According to some embodiments of the present application, the present application further provides a battery device 10, including the battery cell 20 described in any of the above solutions.

[0151] According to some embodiments of the present application, the present application further provides an electrical device, including the battery device 10 described in any of the above solutions, and the battery device 10 is used to provide electrical energy for the electrical device.

[0152] The electrical device can be any of the aforementioned devices or systems using batteries.

[0153] According to some embodiments of the present application, referring to Figures 3 to 17 , the present application provides a battery cell, including: a housing 21; a first electrode terminal 231, the first electrode terminal 231 is disposed on the housing 21 and is electrically insulated from the housing 21; an electrode assembly 22, accommodated in the housing 21, the electrode assembly 22 includes a first electrode plate 225 and a second electrode plate 226 with opposite polarities, the first electrode plate 225 and the second electrode plate 226 are alternately stacked along the thickness direction of the electrode assembly 22, the circumferential direction of the electrode assembly 22 includes two relatively arranged first end faces 2201 and two relatively arranged second end faces 2202, the area of the second end face 2202 is larger than the area of the first end face 2201, the first electrode plate 225 is provided with a first tab 221, the second electrode plate 226 is provided with a second tab 222, the first tab 221 is electrically connected to the first electrode terminal 231, the second tab 222 is electrically connected to the housing 21, and the second tab 222 is located on the second end face 2202. The first tab 221 is located on the first end face 2201; or, the first tab 221 and the second tab 222 are respectively located on two relatively arranged second end faces 2202. The first tab 221 is a positive tab, and the second tab 222 is a negative tab. The electrode assembly 22 includes at least one first tab 221 and at least one second tab 222, and the total width of at least one second tab 222 is greater than the total width of at least one first tab 221.

[0154] The second end face 2202 is provided with a plurality of second tab ears 222 that are spaced apart along the length direction of the electrode assembly 22. Alternatively, the second end face 2202 is provided with a plurality of second tab ears 222 that are spaced apart along the thickness direction of the electrode assembly 22. Alternatively, the second end face 2202 is provided with multiple columns of second tab ears 222 that are distributed along the length direction of the electrode assembly 22. Each column of the second tab ears 222 in the multiple columns of second tab ears 222 includes a plurality of second tab ears 222 that are spaced apart along the thickness direction of the electrode assembly 22, and adjacent two columns of the second tab ears 222 in the multiple columns of second tab ears 222 are staggeredly distributed.

[0155] The electrode assembly 22 further includes: a separator film 224, which is used to isolate the first electrode plate 225 and the second electrode plate 226, and the height by which the second tab ear 222 protrudes from the separator film 224 ranges from [3 mm, 8 mm].

[0156] The housing 21 includes: a housing body 211 having an opening 2111; and a cover plate 212, which is used to cover the opening 2111 of the housing body 211. The cover plate 212 is provided with a first electrode terminal 231, and the first electrode terminal 231 is electrically insulated from the cover plate 212. The cover plate 212 is further provided with a second electrode terminal 232, and the second electrode terminal 232 is electrically connected to the housing body 211 through the cover plate 212.

[0157] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered within the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that, Comprising: A housing (21); A first electrode terminal (231) which is disposed on the housing (21) and is electrically insulated from the housing (21); An electrode assembly (22) accommodated in the housing (21). The electrode assembly (22) includes a first pole piece (225) and a second pole piece (226) with opposite polarities. The first pole piece (225) and the second pole piece (226) are alternately stacked along the thickness direction of the electrode assembly (22). The circumferential direction of the electrode assembly (22) includes two oppositely arranged first end faces (2201) and two oppositely arranged second end faces (2202). The area of the second end face (2202) is larger than the area of the first end face (2201). The first pole piece (225) is provided with a first pole tab (221), and the second pole piece (226) is provided with a second pole tab (222). The first pole tab (221) is electrically connected to the first electrode terminal (231), and the second pole tab (222) is electrically connected to the housing (21). The second pole tab (222) is located on the second end face (2202).

2. The battery cell according to claim 1, wherein The electrode assembly (22) includes at least one first pole tab (221) and at least one second pole tab (222), and the total width of the at least one second pole tab (222) is greater than the total width of the at least one first pole tab (221).

3. The battery cell according to claim 2, wherein Along the width direction of the at least one second pole tab (222), the value range of the ratio of the total width of the at least one second pole tab (222) to the width of the second end face (2202) is [0.5, 0.95].

4. The battery cell according to any one of claims 1 to 3, characterized in that, The first pole tab (221) is located on the first end face (2201).

5. The battery cell according to any one of claims 1 to 3, characterized in that, The first pole tab (221) and the second pole tab (222) are respectively located on two oppositely arranged second end faces (2202).

6. The battery cell according to any one of claims 1 to 3, characterized in that, The second end face (2202) is provided with a plurality of the second pole tabs (222) which are spaced apart along the length direction of the electrode assembly (22).

7. The battery cell according to claim 6, wherein The second end face (2202) is provided with a plurality of the second pole tabs (222) which are spaced apart along the thickness direction of the electrode assembly (22).

8. The battery cell according to claim 6, wherein, The second end face (2202) is provided with multiple columns of second pole tabs (222) which are distributed along the length direction of the electrode assembly (22). Each column of second pole tabs (222) in the multiple columns of second pole tabs (222) includes a plurality of the second pole tabs (222) which are spaced apart along the thickness direction of the electrode assembly (22), and adjacent two columns of second pole tabs (222) in the multiple columns of second pole tabs (222) are staggeredly distributed.

9. The battery cell according to any one of claims 1 to 3, characterized in that, The first pole tab (221) is a positive pole tab, and the second pole tab (222) is a negative pole tab.

10. The battery cell according to any one of claims 1 to 3, characterized in that, The electrode assembly (22) further includes: A separator film (224) which is used to isolate the first pole piece (225) and the second pole piece (226). The value range of the height by which the second pole tab (222) protrudes from the separator film (224) is [3 mm, 8 mm].

11. The battery cell according to any one of claims 1 to 3, characterized in that, The housing (21) includes: A housing (211) having an opening (2111); A cover plate (212) for covering the opening (2111) of the housing (211), the cover plate (212) being provided with the first electrode terminal (231), and the first electrode terminal (231) being electrically insulated from the cover plate (212).

12. The battery cell according to claim 11, characterized in that, The cover plate (212) is further provided with a second electrode terminal (232), and the second electrode terminal (232) is electrically connected to the housing (211) through the cover plate (212).

13. The battery cell according to any one of claims 1 to 3, characterized in that, The second tab (222) is welded to the outer shell (21).

14. A battery device, characterized in that, Comprising: A battery cell according to any one of claims 1 to 13.

15. An electrical device, characterized in that, Comprising: A battery device, the battery device comprising a battery cell according to any one of claims 1 to 13, and the battery device being configured to supply power to the electrical device.

Images