Battery cell, battery, and electric device

Abstract

A battery cell (100), a battery (1000), and an electric device (2000). The battery cell (100) comprises: an electrode assembly (10), the electrode assembly (10) having a main body portion (11) and a tab (12), wherein the tab (12) protrudes from the main body portion (11) in a first direction (F1); a casing (20), which is configured to accommodate the electrode assembly (10); and an electrode terminal (30), the electrode terminal (30) being arranged on the casing (20), wherein the electrode terminal (30) is located on one side of the tab (12) in a second direction (F2), at least part of the electrode terminal (30) and at least part of the tab (12) are arranged opposite each other in the second direction (F2), and the second direction (F2) is perpendicular to the first direction (F1).

Description

Battery cells, batteries and electrical devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure is based on and claims the priority of Chinese patent application with application number 202420289215.9 and application date February 7, 2024. The entire content of this Chinese patent application is incorporated herein by reference into this disclosure. Technical Field

[0003] The present application relates to the field of batteries, and in particular to a battery cell, a battery, and an electrical device. Background Art

[0004] In the related art, electrode terminals are provided on the battery cells, and the electrode terminals of two adjacent battery cells are connected through a busbar, so that multiple battery cells can be connected in series or in parallel. However, the electrode terminals are usually installed on the outside of the battery cell shell, and the electrode terminals protrude too much from the shell, resulting in the entire battery cell being too large.

[0005] Summary of the Invention

[0006] In view of the above problems, the present application provides a battery cell, a battery and an electrical device, which can solve the problem of large battery cell size.

[0007] In a first aspect, the present application provides a battery cell, comprising: an electrode assembly, the electrode assembly having a main body and a tab, the tab protruding from the main body in a first direction; a shell for accommodating the electrode assembly, an electrode terminal, the electrode terminal being arranged on the shell, wherein the electrode terminal is located on one side of the tab in a second direction, and at least part of the electrode terminal and at least part of the tab are arranged relative to each other in the second direction, and the second direction is perpendicular to the first direction.

[0008] In the technical solution of the embodiment of the present application, the electrode terminal and the tab are arranged relative to each other in the second direction, so that the electrode terminal and the tab can share a part of the space in the first direction, so that the electrode terminal can utilize the space on the side of the tab, thereby effectively reducing the size of the portion of the electrode terminal protruding from the shell, reducing the overall size of the battery cell, and at the same time, making full use of the space between the main body and the shell, improving the utilization rate of the space, and on the basis of a certain size of the battery cell, helping to increase the space for accommodating the main body, thereby helping to improve the energy density of the battery cell.

[0009] In some embodiments, the housing includes a first wall, the electrode terminal is disposed on the first wall, the electrode assembly extends the electrode tab toward an end surface of the first wall, and the first direction is the thickness direction of the first wall. In the above technical solution, the protrusion of the electrode terminal from the first wall can be reduced, which helps to reduce the size of the battery cell in the first direction and reduce the space occupied by the battery cell arrangement.

[0010] In some embodiments, the end of the electrode terminal away from the main body has a first end surface, and the first end surface is flush with the outer surface of the first wall or located inward of the outer surface of the first wall. In the above technical solution, the electrode terminal does not protrude from the outer shell of the battery cell, thereby further reducing the height of the battery cell. At the same time, since the electrode terminal does not protrude from the outer shell of the battery cell, it also facilitates the stacking of the battery cells, thereby reducing the size of the stacked battery cells.

[0011] In some embodiments, the housing includes a first wall having a mounting hole, the electrode terminal includes a terminal plate located on a side of the first wall proximate to the electrode assembly, and the terminal plate covers the mounting hole, and the battery cell further includes a sealing ring sandwiched between the terminal plate and the first wall. In the above technical solution, gaps are avoided at the connection between the electrode terminal and the housing, thereby preventing leakage of the battery cell to a certain extent.

[0012] In some embodiments, the surface of the sealing ring facing away from the electrode assembly is flush with the outer surface of the first wall, or the surface of the sealing ring facing away from the electrode assembly is located inward of the outer surface of the first wall. In this technical solution, the sealing ring can be prevented from protruding from the outer shell, thereby preventing the battery cell from increasing in size in the first direction. This allows the electrode terminal, sealing ring, and tab to share the space between the main body and the outer surface of the first wall, thereby fully utilizing the space in the battery cell.

[0013] In some embodiments, the first wall has a mounting ring, at least a portion of the mounting hole is formed in the middle of the mounting ring, and the sealing ring is cooperatively connected to the mounting ring. In the above technical solution, the mounting ring is provided to achieve the installation and fixation of the sealing ring on the housing. Moreover, since the mounting ring protrudes toward the main body, after the sealing ring is connected to the mounting ring, it can be prevented from protruding from the housing, thereby reducing the size of the battery cell in the first direction. This allows the electrode terminal, the sealing ring, and the tab to share the space between the main body and the outer surface of the housing, thereby fully utilizing the space of the battery cell.

[0014] In some embodiments, the device further comprises a fixing member, the fixing member at least partially surrounding the electrode terminal, the electrode terminal being connected to the first wall via the fixing member. In the above technical solution, the electrode terminal is mounted on the housing via the fixing member to achieve installation and fixation of the electrode terminal.

[0015] In some embodiments, the fixing member includes: a first fixing portion, the first fixing portion at least partially surrounding the terminal plate to fix the electrode terminal to the first fixing portion; and a second fixing portion, including a main body and a first connecting portion connected to the main body and extending away from the terminal plate, the main body engaging the first fixing portion, and the first connecting portion engaging the first wall. In the above technical solution, the first fixing portion secures the electrode terminal, and the second fixing portion engages the first wall, so that the electrode terminal is mounted on the housing.

[0016] In some embodiments, the fixing member defines a limiting hole, and the limiting hole includes a first limiting section and a second limiting section with different apertures. The second limiting section is located on a side of the first limiting section close to the main body and has an aperture smaller than that of the first limiting section. A limiting step is formed between the second limiting section and the first limiting section, and part of the electrode terminal is mounted on the limiting step. In the above technical solution, by providing the limiting hole with two sections with different apertures, a limiting step can be formed, so that the electrode terminal can be mounted on the limiting step, making the electrode terminal easier to install. At the same time, the limiting step can support and fix the electrode terminal, preventing the electrode terminal from falling completely into the housing.

[0017] In some embodiments, a surface of the housing adjacent to the electrode assembly has a mounting groove that is recessed away from the electrode assembly, the mounting hole being defined at the bottom of the mounting groove, and a portion of the fixing member being located within the mounting groove and fixedly connected to the housing. In the above technical solution, the fixing member is located between the main body of the electrode assembly and the outer surface of the housing, so that the fixing member does not protrude from the housing, thereby reducing the size of the battery cell in the first direction and allowing the electrode terminal, fixing member, and tab to share the space between the main body and the outer surface of the housing, thereby fully utilizing the space of the battery cell. The provision of the mounting groove can increase the space between the main body and the housing, facilitating the installation of various structural components and further improving the utilization rate of the battery cell space.

[0018] In some embodiments, the device further includes: a transition piece, through which the electrode terminal and the tab are connected, the transition piece comprising a first connecting segment, a second connecting segment, and a third connecting segment connected in sequence, the first connecting segment being connected to the electrode terminal, the third connecting segment being connected to the tab, the third connecting segment and the first connecting segment being located on opposite sides of the second connecting segment in the second direction, and the third connecting segment and the first connecting segment being located on opposite sides of the second connecting segment in the first direction. In the above technical solution, two oppositely arranged tabs and electrode terminals can be connected, making full use of the space between the main body and the housing, thereby improving space utilization.

[0019] In some embodiments, the device further comprises a support member disposed between the housing and the main body, the support member having a clearance space for the electrode terminal and the tab, wherein, in the second direction, the projections of the electrode terminal, the tab, and the support member at least partially overlap. In the above technical solution, the electrode terminal and the tab can share the clearance space in the middle of the support member, thereby fully utilizing the space.

[0020] In some embodiments, the housing comprises a shell and an end cap, wherein at least one side of the shell has an opening, the end cap is connected to the shell and is used to close the opening, and the electrode terminal is disposed on a side of the end cap proximal to the electrode assembly. In the above technical solution, the electrode terminal can extend into the shell and does not protrude above the upper surface of the end cap, thereby effectively reducing the size of the battery cell and facilitating the stacking of the battery cells, thereby reducing the size of the stacked battery cells.

[0021] In some embodiments, the battery cell also includes a protective member, which is arranged on the outside of the shell and has an avoidance hole. The electrode terminal is located on the inner side of the protective member, and the avoidance hole corresponds to the position of at least part of the electrode terminal. In the above technical solution, the electrode terminal is hidden on the inner side of the protective member, and the electrode terminal does not protrude from the protective member, which can effectively reduce the size of the battery cell and reduce the space occupied by the battery cell arrangement.

[0022] In a second aspect, the present application provides a battery comprising the battery cells and a busbar in the above embodiment, wherein one of the battery cells is adapted to be connected to another of the battery cells via the busbar.

[0023] In some embodiments, the busbar comprises a body and a protrusion, and the battery cells are provided with avoidance holes. The protrusion protrudes from one side of the body and is adapted to extend into the avoidance hole to connect with the electrode terminal. In the above technical solution, the protrusion is inserted into the avoidance hole to electrically connect with the electrode terminal, and a portion of the protrusion can extend into the battery cell in the first direction, thereby reducing the size of the busbar protruding from the battery cell, thereby reducing the height of the entire battery in the first direction after multiple battery cells are connected, thereby improving the utilization of the entire internal space of the battery.

[0024] In a third aspect, the present application provides an electrical device, which includes the battery in the above embodiment, and the battery is used to provide electrical energy.

[0025] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0027] FIG1 is a schematic diagram of an electric device in the related art;

[0028] FIG2 is a schematic diagram of a battery in the related art;

[0029] FIG3 is a schematic diagram of a battery cell in the related art;

[0030] FIG4 is a schematic diagram of a battery cell provided in some embodiments of the present application;

[0031] FIG5 is a cross-sectional view of a battery cell provided in some embodiments of the present application;

[0032] FIG6 is a schematic diagram of circle A in FIG5 ;

[0033] FIG7 is a schematic diagram of an end cap provided in some embodiments of the present application;

[0034] FIG8 is a cross-sectional view of an end cap provided in some embodiments of the present application;

[0035] FIG9 is a schematic diagram of circle B in FIG8 ;

[0036] FIG10 is a schematic diagram of a battery according to some embodiments of the present application.

[0037] Reference numerals:

[0038] Battery 1000, power device 2000, box 200, upper shell 210, lower shell 220,

[0039] Battery cell 100,

[0040] The electrode assembly 10, the main body 11, the tab 12, the second end surface 121,

[0041] Housing 20, first wall 201, housing 21, end cover 22, mounting hole 23, mounting groove 24, mounting ring 25,

[0042] Electrode terminal 30, third end face 31, first end face 32, terminal plate 33, sealing ring 40, fixing member 50, first fixing portion 501, second fixing portion 502, main body 5021, first connecting portion 5022, limiting hole 503, limiting step 51, protective member 60, avoidance hole 61, adapter 70, first connecting section 71, second connecting section 72, third connecting section 73, support member 80, bus 90, main body 91, protrusion 92. DETAILED DESCRIPTION

[0043] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

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

[0045] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0046] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0047] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0048] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0049] The term "plurality" used in this application refers to two or more (including two).

[0050] In this application, a battery refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the batteries mentioned in this application may include battery modules or battery packs. Some batteries may include a casing for enclosing one or more battery cells or multiple battery modules. The casing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells. Of course, some batteries may not include the above-mentioned casing and are directly installed in the battery installation compartment of the electrical device.

[0051] In this application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application do not limit this. Battery cells may be cylindrical, flat, rectangular, or other shapes, etc., and the embodiments of this application do not limit this. Battery cells are generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the embodiments of this application do not limit this.

[0052] For example, a battery cell may include a housing, an electrode assembly, and an electrolyte, wherein the housing is used to contain the electrode assembly and the electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet, and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer, and the positive electrode collector not coated with the positive electrode active material layer serves as the positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc.

[0053] The negative electrode sheet consists of a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The negative current collector uncoated with the negative active material layer protrudes from the negative current collector coated with the negative active material layer. The negative current collector uncoated with the negative active material layer serves as the negative electrode tab. The negative current collector can be made of copper, and the negative active material can be carbon, silicon, or other materials. To ensure that high currents can pass without melting, multiple positive electrode tabs are stacked together, and multiple negative electrode tabs are stacked together.

[0054] The material of the isolation film may be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly may be a wound structure or a laminated structure, but the embodiments of the present application are not limited thereto.

[0055] Battery cells can be equipped with electrode terminals and other components connected to the tabs, serving as electrical connections. Furthermore, they can have pressure relief features. When the internal pressure in a battery cell becomes excessive (e.g., due to thermal runaway), these features release substances (e.g., gas, liquid, particulate matter, etc.) from the cell to reduce the internal pressure. This prevents excessive internal pressure from causing dangerous accidents such as explosions. For example, these relief features can be explosion-proof valves, explosion-proof discs, and the like.

[0056] For example, as shown in Figures 1 and 2 , some electrical devices 2000 are powered by batteries 1000. The battery 1000 includes a housing 200 and battery cells 100. The housing 200 includes an upper shell 210 and a lower shell 220. Conventionally, as shown in Figure 3 , the battery cells 100 are provided with electrode terminals 30. Busbars 90 connect the electrode terminals 30 of two adjacent battery cells 100, thereby connecting multiple battery cells 100 in series or in parallel. However, the electrode terminals 30 are typically mounted on the outside of the housing 20 of the battery cells 100, protruding excessively from the housing 20. The electrode terminals 30 are electrically connected to the tabs 12 within the battery cells 100, requiring space within the battery cells 100 for the tabs. The electrode terminal spaces and tab spaces for mounting the electrode terminals 30 are arranged from top to bottom, occupying a significant amount of space in the vertical direction and resulting in an oversized battery cell 100.

[0057] To this end, the present application proposes a battery cell 100 comprising: an electrode assembly 10 and a shell 20, the electrode assembly 10 having a main body 11 and a tab 12, the tab 12 protruding from the main body 11 in a first direction F1; the shell 20 is used to accommodate the electrode assembly 10, and the battery cell 100 also includes an electrode terminal 30, which is provided on the shell 20, wherein the electrode terminal 30 is located on one side of the tab 12 in a second direction F2, and at least a portion of the electrode terminal 30 and at least a portion of the tab 12 are arranged relative to each other in the second direction F2, and the second direction F2 is perpendicular to the first direction F1.

[0058] In the battery cell 100 of the above-mentioned structure, the electrode terminal 30 and the tab 12 are arranged relative to each other in the second direction F2, and the electrode terminal 30 and the tab 12 can share a part of the space in the first direction F1, so that the electrode terminal 30 can utilize the space on the side of the tab 12, thereby effectively reducing the size of the portion of the electrode terminal 30 protruding from the shell 20, reducing the overall size of the battery cell 100, and at the same time, making full use of the space between the main body 11 and the shell 20, thereby improving the utilization rate of the space. On the basis of a certain size of the battery cell 100, it is beneficial to increase the space for accommodating the main body 11, and further beneficial to improving the energy density of the battery cell 100.

[0059] The battery 1000 disclosed in the embodiment of the present application can be used in, but not limited to, an electrical device 2000 such as a vehicle, ship, or aircraft. The power supply system of the electrical device 2000 can be composed of the battery 1000 disclosed in the present application to ensure the safety and reliability of the electrical device 2000.

[0060] For example, the power-consuming device 2000 disclosed in the embodiments of the present application may be, but is not limited to, a vehicle, a mobile phone, a tablet, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. A vehicle may be a fuel vehicle, a gas vehicle, a new energy vehicle, or a rail vehicle, and a new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc.; a spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, etc.; an electric toy includes a fixed or mobile electric toy, such as a game console, an electric vehicle toy, an electric ship toy, and an electric airplane toy, etc.; an electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, etc.

[0061] Hereinafter, a battery 1000 according to an embodiment of the present application will be described with reference to the accompanying drawings.

[0062] As shown in Figures 4 to 6, Figure 4 is a schematic diagram of a battery cell 100 provided in some embodiments of the present application; Figure 5 is a cross-sectional view of a battery cell 100 provided in some embodiments of the present application; Figure 6 is a schematic diagram of circle A in Figure 5; the battery cell 100 of the embodiment of the present application includes: an electrode assembly 10 and a shell 20, the electrode assembly 10 has a main body 11 and a tab 12, the tab 12 protrudes from the main body 11 in a first direction F1; the shell 20 is used to accommodate the electrode assembly 10, the shell 20 has an electrode terminal 30, the electrode terminal 30 is provided on the shell 20 and the electrode terminal 30 extends in a direction close to the main body 11, wherein the electrode terminal 30 is located on one side of the tab 12 in the second direction F2, and at least a portion of the electrode terminal 30 and at least a portion of the tab 12 are arranged relative to each other in the second direction F2, and the second direction F2 is perpendicular to the first direction F1.

[0063] The housing 20 is a structural component of the battery cell 100 , and contains the electrode assembly 10 and electrolyte.

[0064] The electrode assembly 10 is disposed within the housing 20. The housing 20 may contain one or more electrode assemblies 10. Each electrode assembly 10 includes at least one positive electrode sheet and at least one negative electrode sheet. The positive and negative electrode sheets are wound or stacked, and a separator is typically provided between the positive and negative electrode sheets.

[0065] The electrode assembly 10 includes a main body 11 and tabs 12. The tabs 12 protrude from the main body 11 in a first direction F1, as shown in FIG4 . The first direction F1 is the vertical direction. The portions of the positive and negative electrode sheets containing active material constitute the main body 11 of the electrode assembly 10, while the portions of the positive and negative electrode sheets not containing active material each constitute a tab 12. Specifically, the tabs 12 include a positive tab 12 and a negative tab 12. The positive and negative tabs 12 can be located together at one end of the main body 11 or separately at opposite ends of the main body 11. During the charge and discharge process of the battery 1000, the positive and negative active materials react with the electrolyte, and the tabs 12 connect to the electrode terminals 30 to form a current circuit.

[0066] The electrode terminal 30 is disposed on the housing 20 . The electrode terminal 30 can be used to electrically connect to the tab 12 of the electrode assembly 10 to output or input electrical energy of the battery cell 100 .

[0067] The electrode terminal 30 extends along a first direction F1 toward the main body 11. As shown in Figure 5 , the electrode terminal 30 extends downward. In a second direction F2, the electrode terminal 30 is located on one side of the tab 12, and at least a portion of the electrode terminal 30 is arranged opposite at least a portion of the tab 12. That is, when the electrode terminal 30 and the tab 12 are projected onto a plane along the second direction F2, the projection of the electrode terminal 30 and the projection of the tab 12 at least partially overlap. As a result, in the first direction F1, the electrode terminal 30 and the tab 12 can share a portion of space. As shown in Figure 5 , the second direction F2 is a left-right direction and is perpendicular to the first direction F1.

[0068] In the technical solution of the embodiment of the present application, the electrode terminal 30 and the tab 12 are arranged relative to each other in the second direction F2, and the electrode terminal 30 and the tab 12 can share a part of the space in the first direction F1, so that the electrode terminal 30 can utilize the space on the side of the tab 12, thereby effectively reducing the size of the portion of the electrode terminal 30 protruding from the outer shell 20, reducing the overall size of the battery cell 100, and at the same time, making full use of the space between the main body 11 and the outer shell 20, thereby improving the utilization rate of the space. On the basis of a certain size of the battery cell 100, it is beneficial to increase the space for accommodating the main body 11, and further beneficial to improving the energy density of the battery cell 100.

[0069] As shown in FIG6 , in some embodiments, the electrode terminal 30 has a third end surface 31 at one end close to the main body 11 , and the tab 12 has a second end surface 121 at one end away from the main body 11 . The third end surface 31 is closer to the main body 11 than the second end surface 121 .

[0070] As shown in Figure 6, the lower surface of the electrode terminal 30 is the third end face 31, and the upper surface of the tab 12 is the second end face 121. In the up and down direction, the third end face 31 is located below the second end face 121. Therefore, in the left and right direction, a portion of the electrode terminal 30 is located on one side of the tab 12, and the portion of the electrode terminal 30 can be arranged opposite to the portion of the tab 12. In the up and down direction, a portion of the electrode terminal 30 and a portion of the tab 12 can share the same space, effectively reducing the height dimension of the battery cell 100 in the first direction F1.

[0071] As shown in FIG5 , in some embodiments, the housing 20 includes a first wall 201 , the electrode terminal 30 is disposed on the first wall 201 , the electrode assembly 10 extends a tab 12 toward the end surface of the first wall 201 , and the first direction F1 is the thickness direction of the first wall 201 .

[0072] As shown in Figure 5, the top of the shell 20 is the first wall 201, and the thickness direction of the first wall 201 is the up and down direction as shown in the figure. The first direction F1 is the up and down direction, and the upper end face of the electrode assembly 10 extends out of the pole ear 12. The second direction F2 is the left and right direction as shown in Figure 5. A portion of the electrode terminal 30 is located on the left or right side of a portion of the pole ear 12, thereby reducing the size of the electrode terminal 30 protruding from the first wall 201, which is beneficial to reducing the size of the battery cell 100 in the first direction F1 and reducing the space occupied by the battery cell 100.

[0073] As shown in FIG. 6 , in some embodiments, the end of the electrode terminal 30 away from the main body 11 has a first end surface 32 , which is flush with the outer surface of the first wall 201 or located inside the outer surface of the first wall 201 .

[0074] As shown in Figure 6, the upper surface of the electrode terminal 30 is the first end surface 32, and the first end surface 32 is located on the lower side of the upper surface of the first wall 201. Therefore, the electrode terminal 30 will not protrude from the outer shell 20 of the battery cell 100, thereby further reducing the height of the battery cell 100. At the same time, since the electrode terminal 30 does not protrude from the outer shell 20 of the battery cell 100, it is also beneficial to the stacking of the battery cells 100, thereby reducing the size of the stacked battery cells 100.

[0075] Of course, the upper surface of the electrode terminal 30 can also be flush with the upper surface of the first wall 201, that is, the first end face 32 is located on the side of the outer surface of the first wall 201 close to the main body 11, thereby avoiding the electrode terminal 30 protruding from the outer shell 20 and causing the size of the battery cell 100 to increase. At the same time, it is also beneficial to the stacking of the battery cells 100 and can reduce the size of the stacked battery cells 100.

[0076] As shown in Figure 6, in some embodiments, the housing 20 includes a first wall 201, the first wall 201 has a mounting hole 23, the electrode terminal 30 includes a terminal plate 33, the terminal plate 33 is located on the side of the first wall 201 close to the electrode assembly 10, the terminal plate 33 covers the mounting hole 23, and the battery cell 100 also includes a sealing ring 40, which is clamped between the terminal plate 33 and the first wall 201.

[0077] As shown in Figure 6, a mounting hole 23 is provided on the first wall 201 of the outer shell 20, and a part of the electrode terminal 30 is the terminal plate 33, or the electrode terminal 30 is the terminal plate 33 as a whole. The size of the terminal plate 33 is larger than the size of the mounting hole 23, so that the terminal plate 33 can be located on one side of the mounting hole 23 without falling out of the mounting hole 23. A sealing ring 40 is provided at the mounting hole 23, and the sealing ring 40 is clamped between the terminal plate 33 and the first wall 201, thereby achieving a sealed fit between the electrode terminal 30 and the first wall 201, avoiding the formation of gaps at the connection between the electrode terminal 30 and the outer shell 20, and thus avoiding leakage of the battery cell 100 to a certain extent.

[0078] As shown in FIG6 , in some embodiments, the side surface of the sealing ring 40 away from the electrode assembly 10 is flush with the outer surface of the first wall 201 or the side surface of the sealing ring 40 away from the electrode assembly 10 is located on the inner side of the outer surface of the first wall 201 .

[0079] As shown in Figure 6, the upper surface of the sealing ring 40 is located below the upper surface of the first wall 201, thereby preventing the sealing ring 40 from protruding from the first wall 201 and causing the size of the battery cell 100 to increase in the first direction F1, so that the electrode terminal 30, the sealing ring 40 and the tab 12 can share the space between the main body 11 and the outer surface of the first wall 201, thereby fully utilizing the space of the battery cell 100.

[0080] Of course, the upper surface of the sealing ring 40 can also be flush with the upper surface of the first wall 201, so that the sealing ring 40 will not protrude from the first wall 201, thereby avoiding the increase in the size of the battery cell 100 in the first direction F1 to a certain extent. The electrode terminal 30, the sealing ring 40 and the tab 12 can share the space between the main body 11 and the outer surface of the first wall 201, thereby fully utilizing the space of the battery cell 100.

[0081] As shown in FIG. 6 , in some embodiments, the first wall 201 has a mounting ring 25 , at least a portion of the mounting hole 23 is formed in the middle of the mounting ring 25 , and the sealing ring 40 is cooperatively connected to the mounting ring 25 .

[0082] As shown in Figure 6, a mounting ring 25 is provided on the first wall 201, and a mounting hole 23 or a part of the mounting hole 23 is formed in the middle of the mounting ring 25. The mounting ring 25 extends downward, and the sealing ring 40 can be fixed on the mounting ring 25. For example, the sealing ring 40 is defined by an annular slot, and the mounting ring 25 can be inserted into the annular slot, so that the sealing ring 40 can be wrapped around the outside of the mounting ring 25 to achieve the installation of the sealing ring 40 on the outer shell 20. At the same time, the sealing ring 40 abuts against the electrode terminal 30, thereby sealing the gap between the electrode terminal 30 and the outer shell 20 to prevent liquid leakage, etc.; of course, a slot can also be formed on the mounting ring 25, and a part of the sealing ring 40 is inserted into the mounting ring 25, and the other part of the sealing ring 40 abuts against the electrode terminal 30.

[0083] In the above technical solution, the installation and fixation of the sealing ring 40 on the outer shell 20 is achieved by providing a mounting ring 25, and since the mounting ring 25 protrudes toward the main body 11, after the sealing ring 40 is connected to the mounting ring 25, the sealing ring 40 can be prevented from protruding from the outer shell 20, thereby reducing the size of the battery cell 100 in the first direction F1, so that the electrode terminal 30, the sealing ring 40 and the tab 12 can share the space between the main body 11 and the outer surface of the outer shell 20, thereby fully utilizing the space of the battery cell 100.

[0084] As shown in FIG. 6 , in some embodiments, the battery cell 100 further includes a fixing member 50 , the fixing member 50 at least partially surrounding the electrode terminal 30 , and the electrode terminal 30 is connected to the first wall 201 through the fixing member 50 .

[0085] As shown in Figure 6, the outer periphery of the fixing member 50 is connected to the outer shell 20, and a limiting hole 503 is formed in the middle of the fixing member 50. The electrode terminal 30 can be installed in the middle of the fixing member 50, so that the electrode terminal 30 is installed on the outer shell 20 through the fixing member 50. The fixing member 50 can be an insulating member. Since the electrode terminal 30 is connected to the outer shell 20 through the fixing member 50, the electrode terminal 30 is not directly connected to the outer shell 20, thereby avoiding the risk of short circuit.

[0086] As shown in Figures 8 and 9, in some embodiments, the fixing member 50 includes: a first fixing portion 501, the first fixing portion 501 at least partially surrounds the terminal plate 33 to fix the electrode terminal 30 to the first fixing portion 501; and a second fixing portion 502, including a main body 5021 and a first connecting portion 5022 connected to the main body 5021 and extending in a direction away from the terminal plate 33, the main body 5021 is engaged with the first fixing portion 501, and the first connecting portion 5022 is engaged with the first wall 201.

[0087] As shown in Figures 8 and 9, the first fixing part 501 can be surrounded by the outer periphery of the terminal plate 33. The inner side of the first fixing part 501 has a limiting step 51, and the electrode terminal 30 can be supported on the limiting step 51. The first fixing part 501 fixes the electrode terminal, and the main body 5021 of the second fixing part 502 extends into the first fixing part 501. The first connecting part 5022 of the second fixing part 502 is engaged with the outer shell, so that the electrode terminal 30 is installed on the outer shell 20. There is no need for the electrode terminal 30 to be directly connected to the outer shell 20, which is convenient for installation.

[0088] As shown in Figure 6, in some embodiments, the fixing member 50 defines a limiting hole 503, and the limiting hole 503 includes a first limiting section and a second limiting section with different apertures. The second limiting section is located on the side of the first limiting section close to the main body 11, and the aperture of the second limiting section is smaller than the aperture of the first limiting section. A limiting step 51 is formed between the second limiting section and the first limiting section, and the electrode terminal 30 is installed on the limiting step 51.

[0089] As shown in Figure 6, the limiting hole 503 includes a first limiting section and a second limiting section, and the apertures of the first limiting section and the second limiting section are different, thereby forming a limiting step 51 on the periphery of the limiting hole. The periphery of the electrode terminal 30 can be supported on the limiting step 51 to realize the connection between the electrode terminal 30 and the fixing member 50, and the lower end of the electrode terminal 30 can pass through the limiting hole and extend into the interior of the shell 20, which is beneficial to the electrical connection between the electrode terminal 30 and the tab 12.

[0090] By setting the limiting hole into two sections with different apertures, a limiting step 51 can be formed, so that the electrode terminal 30 can be installed on the limiting step 51, making the installation of the electrode terminal 30 convenient. At the same time, the limiting step 51 can support and fix the electrode terminal 30, preventing the electrode terminal 30 from falling completely into the interior of the shell 20, etc.

[0091] As shown in Figure 6, in some embodiments, the side surface of the first wall 201 close to the electrode assembly 10 has a mounting groove 24 that is recessed in a direction away from the electrode assembly 10, and the bottom of the mounting groove 24 is defined by a mounting hole 23. A portion of the fixing member 50 is located in the mounting groove 24 and is fixedly connected to the outer shell 20.

[0092] As shown in Figure 6, a portion of the lower side surface of the first wall 201 is recessed upward to form a mounting groove 24, and the fixing member 50 is installed in the mounting groove 24, so that the fixing member 50 is located between the main body 11 of the electrode assembly 10 and the outer surface of the first wall 201, so that the fixing member 50 does not protrude from the outer shell 20, reducing the size of the battery cell 100 in the first direction F1, so that the electrode terminal 30, the fixing member 50 and the tab 12 can share the space between the main body 11 and the outer surface of the outer shell 20, thereby fully utilizing the space of the battery cell 100; the setting of the mounting groove 24 can increase the space between the main body 11 and the first wall 201, which is beneficial to the installation of various structural parts and further improves the utilization rate of the space of the battery cell 100.

[0093] As shown in Figures 4 to 6, in some embodiments, the battery cell 100 also includes: an adapter 70, the electrode terminal 30 is connected to the tab 12 through the adapter 70, the adapter 70 includes a first connecting segment 71, a second connecting segment 72 and a third connecting segment 73 connected in sequence, the first connecting segment 71 is connected to the electrode terminal 30, the third connecting segment 73 is connected to the tab 12, the third connecting segment 73 and the first connecting segment 71 are respectively located on opposite sides of the second connecting segment 72 in the second direction F2, and the third connecting segment 73 and the first connecting segment 71 are located on opposite sides of the second connecting segment 72 in the first direction F1.

[0094] As shown in FIG. 4 , the battery cell 100 further includes a connecting piece 70 , which is used to connect the tab 12 and the electrode terminal 30 to form a current loop.

[0095] The adapter 70 includes a first connecting segment 71, a second connecting segment 72 and a third connecting segment 73. The first connecting segment 71 is connected to the electrode terminal 30, and the third connecting segment 73 is connected to the tab 12. The third connecting segment 73 and the first connecting segment 71 are connected through the second connecting segment 72, and in the second direction F2, the third connecting segment 73 and the first connecting segment 71 are respectively located on opposite sides of the second connecting segment 72.

[0096] As shown in Figure 4, taking the adapter 70 on the left as an example, the tab 12 is located on the right side of the electrode terminal 30. In the second direction F2, the first connecting segment 71 is located on the left side of the second connecting segment 72, and the third connecting segment 73 is located on the right side of the second connecting segment 72. In the first direction F1, the first connecting segment 71 is located on the lower side of the second connecting segment 72, and the third connecting segment 73 is located on the upper side of the second connecting segment 72, so that the first connecting segment 71 is located on the lower side of the third connecting segment 73, thereby making it possible for the two relatively arranged tabs 12 and electrode terminals 30 to be connected, and the space between the main body 11 and the shell 20 can be fully utilized, thereby improving the utilization rate of the space.

[0097] As shown in Figure 4, the second connecting section 72 extends in the up-down direction, thereby reducing the space occupied by the second connecting section 72 in the second direction F2, and further reducing the distance between the tab 12 and the electrode terminal 30 in the second direction F2, reducing the size of the battery cell 100 in the second direction F2, improving the compactness of the structure, improving the utilization of space, and helping to improve the energy density of the battery cell 100.

[0098] As shown in Figures 5 and 6, in some embodiments, the battery cell 100 further includes: a support member 80, which is arranged between the outer shell 20 and the main body 11, and the support member 80 has an avoidance space for avoiding the electrode terminal 30 and the tab 12. In the second direction F2, the projection of the electrode terminal 30, the projection of the tab 12 and the projection of the support member 80 at least partially overlap.

[0099] The support member 80 is disposed inside the housing 20 and is made of an insulating material. The support member 80 can be used to isolate the electrical connection components inside the housing 20 from the housing 20 to reduce the risk of short circuits. For example, the support member 80 can be made of plastic, rubber, etc.

[0100] As shown in Figure 6, the lower side of the support member 80 abuts against the main body 11, and the upper side of the support member 80 abuts against the inner surface of the shell 20. For example, the support member 80 is connected to the end cover 22. The support member 80 can be injection molded on the lower surface of the end cover 22, so that the support member 80 is fixedly connected to the end cover 22. On the basis of achieving the fixation of the support member 80, the end cover 22 and the main body 11 are effectively isolated, reducing the risk of short circuit.

[0101] An avoidance space is formed on the support member 80, and the electrode terminal 30 and the pole tab 12 can be located in the avoidance space so that the electrode terminal 30 and the pole tab 12 can be connected. In the second direction F2, the projection of the electrode terminal 30, the projection of the pole tab 12 and the projection of the support member 80 at least partially overlap, and the electrode terminal 30 and the pole tab 12 can share the avoidance space in the middle of the support member 80, thereby fully utilizing the space.

[0102] As shown in Figures 4 and 7, in some embodiments, the outer shell 20 includes: a shell 21 and an end cover 22, at least one side of the shell 21 has an opening, the end cover 22 is connected to the shell 21 and is used to close the opening, and the electrode terminal 30 is provided on the side of the end cover 22 close to the electrode assembly 10.

[0103] The housing 21 may be a hollow structure with an opening at one end, or a hollow structure with openings at two opposite ends. The housing 21 may be in various shapes, such as a prism.

[0104] The end cap 22 is a component that closes the opening of the shell 21 to isolate the internal environment of the battery cell 100 from the external environment. The end cap 22 and the shell 21 together define a storage space for accommodating the electrode assembly 10, the electrolyte and other components. The shape of the end cap 22 can be adapted to the shape of the shell 20. For example, the shell 21 is a rectangular parallelepiped structure, and the end cap 22 is a rectangular plate structure adapted to the shell 20. For another example, the shell 21 is a cylindrical structure, and the end cap 22 is a circular plate structure adapted to the shell 21. The material of the end cap 22 can also be a variety of materials, such as copper, iron, aluminum, steel, aluminum alloy, plastic, etc. The material of the end cap 22 and the shell 21 can be the same or different.

[0105] In an embodiment where the housing 21 is open at one end, one end cap 22 may be provided. In an embodiment where the housing 21 is open at two opposite ends, two end caps 22 may be provided, each of which closes the two openings of the housing 21, and the two end caps 22 and the housing 21 together define a receiving space.

[0106] The electrode terminal 30 is arranged on the lower side of the end cover 22. Therefore, when the end cover 22 is installed above the shell 21, the electrode terminal 30 can extend into the shell 21, and the electrode terminal 30 does not protrude from the upper surface of the end cover 22, thereby effectively reducing the size of the battery cell 100. It is also beneficial to the stacking of the battery cell 100, and further reducing the size of the stacked battery cell 100.

[0107] As shown in Figures 4 and 10, in some embodiments, the battery cell 100 further includes a protective member 60, which is provided on the outer side of the shell 20 and has an avoidance hole 61. The electrode terminal 30 is located on the inner side of the protective member 60, and the avoidance hole 61 corresponds to at least a portion of the position of the electrode terminal 30.

[0108] As shown in Figure 4 , the battery cell 100 also has a protective member 60 , which is disposed outside the outer shell 20 . The protective member 60 may include an insulating sheet and insulating adhesive. The insulating sheet is secured to the outer shell 20 via the insulating adhesive, which may be a filler or double-sided tape. This provides effective insulation, high-voltage protection, and enhances the overall structural strength of the battery cell 100 The insulating sheet can be made of any material and may, for example, be mica, and may also be fire-resistant and resistant to high temperatures.

[0109] The protective member 60 may also be an insulating film or an insulating cover. The insulating film is wrapped around the outside of the shell 20 , and the insulating cover may be arranged on the outside of the shell 20 to achieve insulation and protection.

[0110] An avoidance hole 61 is provided on the protective member 60. The electrode terminal 30 is projected onto the protective member 60 along the first direction F1, and can cover the avoidance hole 61 or be located in the avoidance hole 61. The electrode terminal 30 is located on the lower side of the protective member 60. Therefore, it is convenient to connect the busbar 90 with the electrode terminal 30, and the electrode terminal 30 can be hidden on the inner side of the protective member 60. The electrode terminal 30 does not protrude from the protective member 60, which can effectively reduce the size of the battery cell 100 and reduce the space occupied by the battery cell 100.

[0111] The battery 1000 according to the second embodiment of the present application includes a battery cell 100 and a busbar 90 according to the first embodiment of the present application, and one battery cell 100 is suitable for connecting to another battery cell 100 through the busbar 90.

[0112] As shown in FIG10 , in some embodiments, a mounting hole 23 is provided on the battery cell 100 , and the busbar 90 includes a body 91 and a protrusion 92 . The protrusion 92 protrudes from one side of the body 91 and is suitable for being inserted into the mounting hole 23 and connected to the electrode terminal 30 .

[0113] Two adjacent battery cells 100 are connected by a busbar 90. The busbar 90 includes a main body 91 and a protrusion 92. The protrusion 92 protrudes from one side of the main body 91. The main body 91 can be placed above the outer shell 20. The protrusion 92 is inserted into the mounting hole 23 to be electrically connected to the electrode terminal 30. Under the action of the protective member 60, a short circuit caused by the electrical connection between the main body 91 and the outer shell 20 can be avoided. In the first direction F1, a part of the protrusion 92 can extend under the fixing member 50 of the battery cell 100, which can reduce the size of the busbar 90 protruding from the battery cell 100, thereby reducing the height size of multiple battery cells 100 in the first direction F1 after being connected, thereby improving the utilization rate of the internal space of the entire battery 1000.

[0114] According to the third embodiment of the present application, the power device 2000 includes the battery 1000 according to the second embodiment of the present application, and the battery 1000 is used to provide power to the power device 2000. Therefore, by using the above-mentioned battery 1000, the safety and reliability of the power device 2000 are improved.

[0115] Optionally, as shown in FIG1 , when battery 1000 is used in a vehicle, it can be located at the bottom, front, or rear of the vehicle. Battery 1000 can be used to power the vehicle, for example, as an operating power source for the vehicle. The vehicle can also include a controller and a motor, with the controller controlling battery 1000 to power the motor, for example, to meet the vehicle's starting, navigation, and operating power requirements during driving.

[0116] A battery 1000 and a vehicle having the same according to a specific embodiment of the present application will be described below with reference to the accompanying drawings.

[0117] As shown in FIG. 1 , a battery 1000 is provided at the bottom of a vehicle, and as shown in FIG. 2 , the battery 1000 includes a plurality of battery cells 100 , each of which includes an electrode assembly 10 and a housing 20 .

[0118] The electrode assembly 10 is arranged in the outer shell 20, and the electrode assembly 10 includes a positive electrode sheet and a negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body 11 of the electrode assembly 10, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute a pole ear 12, and the pole ear 12 protrudes from the main body 11 in the first direction F1.

[0119] The housing 20 includes a shell 21 and an end cap 22. The shell 21 is a hollow structure with one end open. The end cap 22 is located at one end of the shell 21 in the first direction and closes the opening of the shell 21. The end cap 22 is provided with a mounting hole 23. The electrode terminal 30 is mounted on the end cap 22 via a fixing member 50. The electrode terminal 30 extends downward and has a terminal plate 33. A sealing ring 40 is provided between the upper end of the terminal plate 33 and the end cap 22. The sealing ring 40 is plugged into the edge of the mounting hole 23.

[0120] A support member 80 is provided on the lower side of the end cover 22 , and the support member 80 has an escape space. A protective member 60 is provided on the upper side of the end cover 22 , and the protective member 60 has an escape hole 61 , and the escape hole 61 corresponds to the position of the mounting hole 23 .

[0121] The upper surface of the electrode terminal 30 is located below the upper surface of the end cover 20, and the electrode terminal 30 extends downward along the first direction F1, and a portion of the electrode terminal 30 extends into the avoidance space. The pole tab 12 extends upward along the first direction F1, and a portion of the pole tab 12 can extend into the avoidance space. In the second direction F2, the electrode terminal 30 is located on one side of the pole tab 12, and a portion of the electrode terminal 30 is arranged opposite to a portion of the pole tab 12. Therefore, in the first direction F1, the electrode terminal 30 and the pole tab 12 can share a portion of the space defined by the support member 80, and the electrode terminal 30 and the pole tab 12 are electrically connected through the adapter 70 arranged in the avoidance space, thereby reducing the height dimension of the battery cell 100 and fully utilizing the internal space of the battery cell 100.

[0122] Two adjacent battery cells 100 are connected by a busbar 90, which includes a main body 91 and a protrusion 92. The protrusion 92 protrudes from one side of the main body 91. The main body 91 can be placed above the outer shell 20. The protrusion 92 can be inserted into the avoidance hole 61 and the mounting hole 23, so that it can be electrically connected to the electrode terminal 30.

[0123] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, wherein: include: an electrode assembly, the electrode assembly comprising a main body and a tab, the tab protruding from the main body in a first direction; a housing for accommodating the electrode assembly, and an electrode terminal, the electrode terminal being provided on the housing, The electrode terminal is located on one side of the tab in a second direction, and at least part of the electrode terminal and at least part of the tab are arranged relative to each other in the second direction, and the second direction is perpendicular to the first direction.

2. The battery cell according to claim 1, wherein: The housing includes a first wall, the electrode terminal is provided on the first wall, the electrode tab extends from the electrode assembly toward an end surface of the first wall, and the first direction is a thickness direction of the first wall.

3. The battery cell according to claim 2, wherein: One end of the electrode terminal away from the main body has a first end surface, and the first end surface is flush with the outer surface of the first wall or is located inside the outer surface of the first wall.

4. The battery cell according to any one of claims 1 to 3, wherein: The shell includes a first wall having a mounting hole, the electrode terminal includes a terminal plate, the terminal plate is located on a side of the first wall close to the electrode assembly, the terminal plate covers the mounting hole, and the battery cell also includes a sealing ring, which is clamped between the terminal plate and the first wall.

5. The battery cell according to claim 4, wherein: A surface of the sealing ring that is away from the electrode assembly is flush with an outer surface of the first wall or a surface of the sealing ring that is away from the electrode assembly is located inside the outer surface of the first wall. The battery cell according to claim 5 , wherein: The first wall has a mounting ring, at least a portion of the mounting hole is formed in the middle of the mounting ring, and the sealing ring is cooperatively connected with the mounting ring.

7. The battery cell according to claim 4, wherein: The device further includes a fixing member, wherein the fixing member at least partially surrounds the electrode terminal, and the electrode terminal is connected to the first wall through the fixing member.

8. The battery cell according to claim 7, wherein: The fixing member includes: The first fixing portion at least partially surrounds the terminal plate to fix the electrode terminal on the first fixing portion; and The second fixing portion includes a main body and a first connecting portion connected to the main body and extending in a direction away from the terminal board. The main body is engaged with the first fixing portion, and the first connecting portion is engaged with the first wall.

9. The battery cell according to claim 7, wherein: The fixing member defines a limiting hole, and the limiting hole includes a first limiting section and a second limiting section with different apertures. The second limiting section is located on a side of the first limiting section close to the main body and the aperture of the second limiting section is smaller than the aperture of the first limiting section. A limiting step is formed between the second limiting section and the first limiting section, and part of the electrode terminal is installed on the limiting step.

10. The battery cell according to claim 7, wherein: A side surface of the first wall close to the electrode assembly has a mounting groove that is recessed in a direction away from the electrode assembly, and the bottom of the mounting groove defines the mounting hole. A portion of the fixing member is located in the mounting groove and fixedly connected to the outer shell.

11. The battery cell according to any one of claims 1 to 10, wherein: Also includes: The electrode terminal and the tab are connected via the adapter. The adapter includes a first connecting segment, a second connecting segment and a third connecting segment connected in sequence, the first connecting segment is connected to the electrode terminal, the third connecting segment is connected to the electrode tab, the third connecting segment and the first connecting segment are respectively located on opposite sides of the second connecting segment in the second direction, and the third connecting segment and the first connecting segment are located on opposite sides of the second connecting segment in the first direction.

12. The battery cell according to any one of claims 1 to 11, wherein: It also includes: a support member, which is arranged between the shell and the main body, and has an avoidance space for avoiding the electrode terminal and the tab. In the second direction, the projection of the electrode terminal, the projection of the tab and the projection of the support member at least partially overlap.

13. The battery cell according to any one of claims 1 to 12, wherein: The outer shell includes: a shell and an end cover, at least one side of the shell has an opening, the end cover is connected to the shell and is used to close the opening, and the electrode terminal is arranged on a side of the end cover close to the electrode assembly.

14. The battery cell according to any one of claims 1 to 13, wherein: The battery cell further includes a protective member disposed on the outer side of the housing and having an escape hole. The electrode terminal is located on the inner side of the protective member, and the escape hole corresponds to at least a portion of the electrode terminal.

15. A battery, wherein: The battery cell comprises the battery cell according to any one of claims 1 to 14 and a busbar, wherein one of the battery cells is adapted to be connected to another of the battery cells via the busbar.

16. The battery according to claim 15, wherein The busbar includes a body and a protruding portion. A mounting hole is provided on the battery cell. The protruding portion protrudes from one side of the body and is suitable for extending into the mounting hole to be connected with the electrode terminal.

17. An electrical device, wherein: The battery according to claim 15 or 16 is used to provide electrical energy to the electrical device.

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