Battery monomer, battery and electric device

Abstract

A battery cell, a battery, and an electric device, the battery cell (100) comprising: an electrode assembly (10), the electrode assembly (10) comprising a main body portion (11) and a tab (12); the shell (20) is used for containing the electrode assembly (10) and comprises a first wall (201), the first wall (201) is provided with a mounting hole (2021), the electrode terminal (30) is arranged on the first wall (201), at least one part of the tab (12) extends into the mounting hole (2021), and the projection of the electrode terminal (30) in the thickness direction of the first wall (201) covers the projection of the tab (12) in the thickness direction.

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 202420288850.5 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, a battery cell has an electrode terminal and an electrode assembly. The tabs of the electrode assembly are electrically connected to the electrode terminal to realize the input or output of electrical energy. In order to install the electrode terminal, an electrode terminal space for installing the electrode terminal needs to be set on the battery cell, and a tab space needs to be reserved inside the battery cell, which causes the entire battery cell to be 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 the first aspect, the present application provides a battery cell, comprising: an electrode assembly, the electrode assembly comprising a main body and a tab; a shell for accommodating the electrode assembly and comprising a first wall, the first wall having a mounting hole, and an electrode terminal, arranged on the first wall, wherein at least a portion of the tab extends into the mounting hole, and the projection of the electrode terminal along the thickness direction of the first wall covers the projection of the tab along the thickness direction.

[0008] In the technical solution of the embodiment of the present application, at least a portion of the pole ear extends into the mounting hole, so that part of the pole ear is hidden in the shell, and the space of the shell can be fully utilized, which is beneficial to reducing the size of the battery cell in the direction of the thickness of the first wall and avoiding the increase in the size of the battery cell to a certain extent.

[0009] In some embodiments, the first wall includes an end plate having a mounting hole. In the above technical solution, at least a portion of the tab is hidden within the end plate. In the thickness direction of the end plate, the space in the mounting hole is utilized to mount at least a portion of the tab, which helps reduce the size of the battery cell in the thickness direction of the end plate and, to a certain extent, avoids an increase in the size of the battery cell.

[0010] In some embodiments, the first wall includes an end plate and a support member, the end plate having a first hole, the support member being disposed between the end plate and the main body, the support member having a second hole, the second hole corresponding to the first hole in position, and the first hole and the second hole forming the mounting hole, at least a portion of the tab extending into the second hole. In the above technical solution, the space in the second hole is utilized to mount at least a portion of the tab, that is, in the thickness direction of the first wall, the tab and the support member share a height space, thereby fully utilizing the space and improving space utilization, which is beneficial to reducing the size of the battery cell in the thickness direction of the first wall, avoiding the increase in the size of the battery cell to a certain extent, and on the basis of a certain size of the battery cell, it is beneficial to increase the space for accommodating the main body, thereby facilitating the improvement of the energy density of the battery cell.

[0011] In some embodiments, the first wall includes an end plate and a support member, the end plate having a first hole, the support member being disposed between the end plate and the main body, the support member having a second hole, the second hole corresponding to the first hole in position, the first hole and the second hole forming the mounting hole, and at least a portion of the tab extending into the second hole and the first hole. In the above technical solution, the space between the first hole and the second hole is utilized to mount at least a portion of the tab, i.e., in the thickness direction of the first wall, the tab shares a height space with the support member and the end plate, which helps to reduce the size of the battery cell in the thickness direction of the first wall and, to a certain extent, avoids an increase in the size of the battery cell.

[0012] In some embodiments, the tabs are directly connected to the electrode terminals. In the above technical solution, the connection structure can be omitted, which is beneficial for further reducing the size of the battery cell.

[0013] In some embodiments, the battery cell further comprises: an adapter disposed between the electrode terminal and the tab, the electrode terminal and the tab being connected via the adapter, the projection of the electrode terminal along the thickness direction of the first wall overlapping the corresponding projection of the adapter along the thickness direction, and at least a portion of the adapter extending into the mounting hole. In the above technical solution, the adapter may be hidden beneath the electrode terminal.

[0014] In some embodiments, the battery cell further includes a sealing ring, which is clamped between the electrode terminal and the first wall. The sealing ring has a first end and a second end that are opposed to each other in the thickness direction of the first wall, and at least a portion of the adapter is located between the first and second ends of the sealing ring. In the above technical solution, the adapter can share the same space with the sealing ring, which helps to reduce the size of the battery cell in the thickness direction of the first wall, can to some extent avoid increasing the size of the battery cell, and improve the utilization rate of the space within the battery cell.

[0015] 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.

[0016] In some embodiments, the fixing member includes: a first fixing portion that at least partially surrounds the electrode terminal to secure the electrode terminal to the first fixing portion; and a second fixing portion that includes a main body and a first connecting portion connected to the main body and extending away from the electrode terminal, the main body being engaged with the first fixing portion, and the first connecting portion being engaged with the first wall. In the above technical solution, the first fixing portion secures the electrode terminal, and the second fixing portion is engaged with the outer shell, thereby securing the electrode terminal to the outer shell.

[0017] 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 away from the main body and has a smaller aperture than the first limiting section. A limiting step is formed between the second limiting section and the first limiting section, and the outer periphery of the electrode terminal is limited between the limiting step and the sealing ring. 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 installed on the limiting step, making the electrode terminal easier to install. At the same time, the limiting step can limit the electrode terminal to prevent the electrode terminal from being disengaged from the housing.

[0018] In some embodiments, the outer surface of the first wall has an inwardly recessed mounting groove, the bottom of the mounting groove defines the mounting hole, and a portion of the fixing member is located within the mounting groove and fixedly connected to the outer shell. In the above technical solution, the fixing member is installed in the mounting groove, which can reduce the protrusion of the fixing member and the electrode terminal from the outer shell, and reduce the size of the battery cell in the thickness direction of the first wall, so that the electrode terminal and the fixing member can utilize a portion of the space in the outer shell, thereby fully utilizing the space of the battery cell; the bottom of the mounting groove defines a mounting hole, and a portion of the tab can extend into the mounting hole, so that the tab can utilize a portion of the space in the outer shell, further improving the utilization rate of the battery cell space.

[0019] In some embodiments, the housing includes 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 first wall is the end cap, and / or the first wall is a portion of the shell. In the above technical solution, the tab is partially hidden within the end cap, and the tab can utilize the space in the end cap, achieving full space utilization and facilitating the reduction of the size of the battery cell.

[0020] In some embodiments, the electrode assembly includes a pole piece and a separator, which are stacked and wound to form the electrode assembly. The battery cell includes two of the electrode assemblies. In the thickness direction of the electrode assembly, the main body has a first side and a second side arranged opposite each other. The tab is located between the first side and the second side and adjacent to the first side. The two electrode assemblies are arranged along the thickness direction of the electrode assembly and are symmetrically arranged along the center of the thickness direction of the electrode assembly. The first sides of the two main bodies are arranged adjacent to each other. In the above technical solution, the tab can be located in the middle of the tops of the two electrode assemblies, which facilitates the tab to extend into the mounting hole, thereby fully utilizing the space in the thickness direction of the first wall and achieving full utilization of the battery cell space.

[0021] In some embodiments, the electrode assembly includes a pole piece and a separator, which are stacked and wound to form the electrode assembly. The battery cell includes one such electrode assembly. In the thickness direction of the electrode assembly, the main body has a first side and a second side arranged opposite each other. The tab is located between the first side and the second side and is spaced apart from both the first side and the second side. In the above technical solution, the tab is located in the middle of the top of the electrode assembly, which facilitates the tab's insertion into the mounting hole, thereby fully utilizing the space in the thickness direction of the first wall and achieving full utilization of the battery cell space.

[0022] In some embodiments, the projection of the tab on the first wall is located within the mounting hole. In the above technical solution, the first end surface of the tab can be entirely located within the mounting hole, reducing the probability of interference between the tab and other positions of the first wall, and the tab can utilize the space of the first wall to fully utilize the space.

[0023] In a second aspect, the present application provides a battery comprising the battery cell in the above embodiment.

[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 provided in some embodiments of the present application;

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

[0031] FIG5 is a cross-sectional view along line AA in FIG4 ;

[0032] FIG6 is a schematic diagram of circle C in FIG5 in some examples;

[0033] FIG7 is a schematic diagram of circle C in FIG5 in other examples;

[0034] FIG8 is a schematic diagram of circle C in FIG5 in some further examples;

[0035] FIG9 is a cross-sectional view along line BB in FIG4 ;

[0036] FIG10 is a schematic diagram of circle D in FIG9 ;

[0037] FIG11 is a schematic diagram of a battery cell provided in some other embodiments of the present application.

[0038] Reference numerals:

[0039] Battery 1000, power device 2000, box 200, upper shell 210, lower shell 220,

[0040] Battery cell 100,

[0041] Electrode assembly 10, main body 11, first side 111, second side 112, tab 12, first end surface 121,

[0042] Housing 20, first wall 201, end plate 202, first hole 2021, shell 21, end cover 22, mounting hole 23, mounting groove 24,

[0043] Electrode terminal 30, 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,

[0044] Adapter 70 , support 80 , second hole 81 . DETAILED DESCRIPTION

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] The term "plurality" used in this application refers to two or more (including two).

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] The material of the separator 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.

[0057] 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.

[0058] 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 a battery cell 100. The housing 200 includes an upper shell 210 and a lower shell 220. The battery cell 100 has an electrode terminal 30 and an electrode assembly 10. The tabs 12 of the electrode assembly 10 are electrically connected to the electrode terminal 30 to enable input or output of electrical energy. To install the electrode terminal 30, a space for the electrode terminal 30 must be provided on the battery cell 100. Space for the tabs must also be reserved within the battery cell 100, resulting in an oversized battery cell 100.

[0059] To this end, the present application proposes a battery cell 100 comprising: an electrode assembly 10 and a shell 20, the electrode assembly 10 comprising a main body 11 and a tab 12, the shell 20 being used to accommodate the electrode assembly 10, and the shell 20 comprising a first wall 201, the first wall 201 having a mounting hole 23, the electrode terminal 30 being arranged on the first wall 201, wherein at least a portion of the tab 12 extends into the mounting hole 23, and the projection of the electrode terminal 30 along the thickness direction F1 of the first wall 201 covers the projection of the tab 12 along the thickness direction F1.

[0060] In the battery cell 100 of the above-mentioned structure, the electrode terminal 30 and the tab 12 can be arranged relative to each other in the thickness direction F1 of the first wall 201, and the tab 12 can be hidden under the electrode terminal 30. At least a portion of the tab 12 extends into the mounting hole 23, so that part of the tab 12 is hidden in the shell 20. The space of the shell 20 can be fully utilized, which is beneficial to reducing the size of the battery cell 100 in the thickness direction F1 of the first wall 201, and to avoid the increase in the size of the battery cell 100 to a certain extent.

[0061] 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.

[0062] 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.

[0063] Hereinafter, a battery cell 100 according to an embodiment of the present application will be described with reference to the accompanying drawings.

[0064] As shown in Figures 3 to 8, Figure 3 is a schematic diagram of a battery cell provided in some embodiments of the present application; Figure 4 is a top view of a battery cell provided in some embodiments of the present application; Figure 5 is a cross-sectional view along line AA in Figure 4; Figures 6 to 8 are schematic diagrams of circled C in Figure 5 in some examples; Figure 9 is a cross-sectional view along line BB in Figure 4; Figure 10 is a schematic diagram of circled D in Figure 7, the battery cell 100 provided in the present application includes: an electrode assembly 10 and a shell 20, the electrode assembly 10 includes a main body 11 and a tab 12, the shell 20 is used to accommodate the electrode assembly 10, the shell 20 includes a first wall 201, the first wall 201 has a mounting hole 23, the electrode terminal 30 is arranged on the first wall 201, wherein at least a portion of the tab 12 extends into the mounting hole 23, and the projection of the electrode terminal 30 along the thickness direction F1 of the first wall 201 covers the projection of the tab 12 along the thickness direction F1.

[0065] The housing 20 is a structural component of the battery cell 100 . The housing 20 accommodates the electrode assembly 10 and electrolyte, etc. The housing 20 includes a first wall 201 having a mounting hole 23 .

[0066] 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 and placed, and a separator is typically provided between the positive and negative electrode sheets.

[0067] The electrode assembly 10 has a main body 11 and tabs 12, wherein the tabs 12 protrude from the main body 11. The portions of the positive and negative electrode sheets containing active materials constitute the main body 11 of the electrode assembly 10, while the portions of the positive and negative electrode sheets not containing active materials each constitute a tab 12. That is, the tabs 12 are the positive and negative tabs, and the positive and negative tabs can be located together at one end of the main body 11 or at both ends of the main body 11. During the charge and discharge process of the battery, 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.

[0068] The electrode terminal 30 is arranged on the first wall 201. 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. Specifically, one electrode terminal 30 corresponds to the positive tab 12, and the other electrode terminal 30 corresponds to the negative tab 12.

[0069] At least a portion of the tab 12 extends into the mounting hole 23, and the space occupied by the tab 12 and the space in the thickness direction F1 of the first wall 201 can partially overlap. The projection of the electrode terminal 30 along the thickness direction F1 of the first wall 201 covers the projection of the tab 12 along the thickness direction F1 of the first wall 201, so that the tab 12 can be hidden under the electrode terminal 30, making full use of the space in the thickness direction F1 of the first wall 201, which is beneficial to reducing the size of the battery cell 100 in the thickness direction F1 of the first wall 201.

[0070] In the technical solution of the embodiment of the present application, the electrode terminal 30 and the tab 12 can be arranged relative to each other in the thickness direction F1 of the first wall 201, and the tab 12 can be hidden under the electrode terminal 30. At least a portion of the tab 12 extends into the mounting hole 23, so that part of the tab 12 is hidden in the outer shell 20. The space of the outer shell 20 can be utilized to fully utilize the space, which is beneficial to reducing the size of the battery cell 100 in the thickness direction F1 of the first wall 201, and to avoid the increase in the size of the battery cell 100 to a certain extent.

[0071] As shown in FIG. 6 , in some embodiments, the first wall 101 includes an end plate 102 , and the end plate 102 has a mounting hole 23 .

[0072] The end plate 102 can be a part of one end of the shell 10 in the up and down direction, or a part of one end in the left and right direction. The end plate 102 forms a first wall 101, and the electrode terminal 30 is arranged on the end plate 102. The end plate 102 has a mounting hole 23. The electrode terminal 30 can be installed at the mounting hole 23, or the electrode terminal 30 can cover the mounting hole 23. At least a part of the pole ear 12 extends into the mounting hole 23, so that at least part of the pole ear 23 is hidden in the end plate 102. In the thickness direction F1 of the end plate 102, at least part of the pole ear 23 is installed using the space of the mounting hole 23, which is beneficial to reducing the size of the battery cell 100 in the thickness direction F1 of the end plate 102, and to a certain extent avoiding the increase in the size of the battery cell 100.

[0073] As shown in Figure 7, in some embodiments, the first wall 101 includes an end plate 102 and a support member 80, the end plate 102 has a first hole 1021, the support member 80 is arranged between the end plate 102 and the main body 11, the support member 80 has a second hole 81, the second hole 81 and the first hole 1021 correspond in position and the first hole 1021 and the second hole 81 form a mounting hole 23, and at least a portion of the tab 12 extends into the second hole 81.

[0074] As shown in FIG7 , a 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, or the like.

[0075] As shown in Figure 7, 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.

[0076] As shown in Figure 7, the end plate 102 and the support member 80 integrally form the first wall 101. Along the thickness direction F1 of the first wall 101, the end plate 102, the support member 80 and the main body 11 are arranged in sequence. The electrode terminal 30 can be installed on the end plate 102. The mounting hole 23 includes two parts. The first hole 1021 on the end plate 102 and the second hole 81 on the support member 80 jointly form the mounting hole 23.

[0077] Among them, a second hole 81 is formed on the support member 80, and the pole ear 12 protrudes above the main body 11. At least a portion of the pole ear 12 protruding from the main body 11 can extend into the second hole 81, so that at least a portion of the pole ear 23 is hidden in the support member 80. In the thickness direction F1 of the first wall 101, at least a portion of the pole ear 23 is installed using the space of the second hole 81, that is, in the thickness direction F1 of the first wall 101, the pole ear 12 and the support member 80 share the height space, realizing full utilization of the space and improving space utilization, which is conducive to reducing the size of the battery cell 100 in the thickness direction F1 of the first wall 101, avoiding the increase in the size of the battery cell 100 to a certain extent, and on the basis of a certain size of the battery cell 100, it is conducive to increasing the space for accommodating the main body 11, and thus is conducive to improving the energy density of the battery cell 100.

[0078] As shown in Figure 8, in some embodiments, the first wall 101 includes an end plate 102 and a support member 80, the end plate 102 has a first hole 1021, the support member 80 is arranged between the end plate 102 and the main body 11, the support member 80 has a second hole 81, the second hole 81 and the first hole 1021 correspond in position and the first hole 1021 and the second hole 81 form a mounting hole 23, and at least a portion of the electrode terminal 30 extends into the second hole 81 and the first hole 1021.

[0079] As shown in Figure 8, the end plate 102 and the support member 80 integrally form a first wall 101. Along the thickness direction F1 of the first wall 101, the end plate 102, the support member 80 and the main body 11 are arranged in sequence. The electrode terminal 30 can be installed on the end plate 102. The mounting hole 23 includes two parts. The first hole 1021 on the end plate 102 and the second hole 81 on the support member 80 together form the mounting hole 23.

[0080] Among them, at least a portion of the pole lug 12 extends into the second hole 81 and the first hole 1021, so that at least a portion of the pole lug 23 is hidden in the support member 80 and the end plate 102, and in the thickness direction F1 of the first wall 101, at least a portion of the pole lug 23 is installed using the space between the first hole 81 and the second hole 81, that is, in the thickness direction F1 of the first wall 101, the pole lug 12 shares the height space with the support member 80 and the end plate 102, which is beneficial to reducing the size of the battery cell 100 in the thickness direction F1 of the first wall 101, and to a certain extent avoiding the increase in the size of the battery cell 100.

[0081] In some embodiments, the tab 12 and the electrode terminal 30 are directly connected.

[0082] The tab 12 can be welded to the electrode terminal 30 to form a current loop, thereby eliminating the need for a connection structure, which is beneficial for further reducing the size of the battery cell 100 .

[0083] As shown in Figures 6 to 10, in some embodiments, the battery cell 100 also includes: an adapter 70, which is arranged between the electrode terminal 30 and the tab 12, and the electrode terminal 30 and the tab 12 are connected through the adapter 70. The projection of the electrode terminal 30 along the thickness direction F1 of the first wall covers the corresponding projection of the adapter 70 along the thickness direction F1 of the first wall 201, and at least a portion of the adapter 70 extends into the mounting hole 23.

[0084] As shown in FIG6 , the battery cell 100 further includes an adapter 70 , which is used to connect the tabs 12 and the corresponding electrode terminals 30 to form a current loop. Each adapter 70 is used to connect one electrode terminal 30 and one tab 12 , and the two electrode terminals 30 and the two tabs 12 respectively have corresponding adapters 70 .

[0085] As shown in Figures 6 and 8, the projection of the electrode terminal 30 in the thickness direction F1 of the first wall 201 covers the projection of the corresponding adapter 70 along the thickness direction F1. As shown in Figure 6, the adapter 70 can be fully extended into the mounting hole 23 of the end plate 102. As shown in Figure 7, the adapter 70 can be fully extended into the first hole 1021 and the second hole 81. As shown in Figure 7, the adapter 70 can be fully extended into the first hole 1021, making full use of the space of the mounting hole 23, so that the adapter 70 can be hidden under the electrode terminal 30. In the thickness direction F1 of the first wall 101, the adapter 70 and the end plate 102 share part of the height space, which is beneficial to reducing the size of the battery cell 100 in the thickness direction F1 of the first wall 101, and can avoid the increase in the size of the battery cell 100 to a certain extent.

[0086] As shown in Figures 6 and 8, in some embodiments, the battery cell 100 also includes a sealing ring 40, which is clamped between the electrode terminal 30 and the first wall 201. In the thickness direction F1 of the first wall 201, the sealing ring 40 has a first end and a second end relative to each other, and at least a portion of the adapter 70 is located between the first end and the second end of the sealing ring 40.

[0087] The sealing ring 40 is clamped between the electrode terminal 30 and the first wall 201 to achieve a sealed fit between the electrode terminal 30 and the first wall 201, thereby avoiding a gap at the connection between the electrode terminal 30 and the housing 20, and further preventing leakage of the battery cell 100 to a certain extent.

[0088] As shown in Figures 6 and 8, the adapter 70 is arranged between the tab 12 and the electrode terminal 30, and an opening is formed in the middle of the sealing ring 40. The adapter 70 is arranged in the opening. In the up and down directions, the sealing ring 40 has an upper end and a lower end. The adapter 70 as a whole or a part of the adapter 70 is located between the upper and lower ends of the sealing ring 40 so that the adapter 70 can be hidden in the sealing ring 40. In the thickness direction F1 of the first wall 201, the adapter 70 can share the same part of the space with the sealing ring 40, which is beneficial to reducing the size of the battery cell 100 in the thickness direction F1 of the first wall 201, and can avoid the increase in the size of the battery cell 100 to a certain extent, thereby improving the utilization rate of the space inside the battery cell 100.

[0089] As shown in FIG. 6 to FIG. 10 , 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 .

[0090] As shown in Figure 10, the outer periphery of the fixing member 50 is connected to the first wall 201, 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 first wall 201 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.

[0091] As shown in Figure 10, in some embodiments, the fixing member 50 includes: a first fixing portion 501, the first fixing portion 501 at least partially surrounds the electrode terminal 30 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 electrode terminal 30, 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.

[0092] As shown in Figure 10, the electrode terminal 30 is installed on the mounting hole 23, and the lower side of the electrode terminal 30 is supported on the sealing ring 40. The first fixing part 501 can surround the outer periphery of the electrode terminal 33. The inner side of the first fixing part 501 has a limiting step 51, which can prevent the electrode terminal 30 from falling out. The first fixing part 501 fixes the electrode terminal 30, 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 first wall 201, 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.

[0093] As shown in Figure 10, 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 away from 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 outer periphery of the electrode terminal 30 is limited between the limiting step 51 and the sealing ring 40.

[0094] As shown in Figure 10, the limiting hole 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 cooperate with the limiting step 51, so that the electrode terminal 30 can be installed on the shell 20 through the fixing member 50, and the lower end of the electrode terminal 30 can abut against the sealing ring 40 to achieve sealing of the gap between the electrode terminal 30 and the shell 20, and also play an insulating role to avoid short circuit between the electrode terminal 30 and the shell 20, etc. The limiting step 51 is pressed on the periphery of the electrode terminal 30 to prevent the electrode terminal 30 from detaching from the upper part of the shell 20.

[0095] 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 electrode terminal 30 easy to install. At the same time, the limiting step 51 can limit the electrode terminal 30 to prevent the electrode terminal 30 from being out of engagement with the shell 20.

[0096] As shown in FIG6 , in some embodiments, the outer surface of the first wall 201 has an inwardly recessed mounting groove 24 , the bottom of the mounting groove 24 defines a mounting hole 23 , and a portion of the fixing member 50 is located in the mounting groove 24 and fixedly connected to the housing 20 .

[0097] As shown in Figure 6, the outer side surface of the first wall 201 has a mounting groove 24, and the fixing member 50 is installed in the mounting groove 24, which can reduce the size of the fixing member 50 and the electrode terminal 30 protruding from the outer shell 20, and reduce the size of the battery cell 100 in the thickness direction F1 of the first wall 201, so that the electrode terminal 30 and the fixing member 50 can utilize part of the space of the outer shell 20, thereby fully utilizing the space of the battery cell 100; the bottom of the mounting groove 24 is defined with a mounting hole 23, and a part of the tab 12 can extend into the mounting hole 23, so that the tab 12 can utilize part of the space of the outer shell 20, further improving the utilization rate of the space of the battery cell 100.

[0098] As shown in Figure 3, in some embodiments, the housing 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, the first wall 201 is the end cover 22, and / or the first wall 201 is a part of the shell 21.

[0099] 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.

[0100] 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.

[0101] 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.

[0102] The first wall 201 is the end cover 22, and the electrode terminal 30 is arranged on the end cover 22. A portion of the pole tab 12 extends into the end cover 22. For example, the end cover 22 has a mounting hole 23, and a portion of the pole tab 12 extends into the mounting hole 23, so that the upper surface of the pole tab 12 is located below the upper surface of the end cover 22, or the upper surface of the pole tab 12 is flush with the upper surface of the end cover 22, that is, part of the pole tab 12 is hidden in the end cover 22. The pole tab 12 can utilize the space of the end cover 22 to fully utilize the space, which is beneficial to reducing the size of the battery cell 100.

[0103] The first wall 201 may also be a part of the shell 21, the electrode terminal 30 is arranged on the shell 21, and a part of the pole tab 12 extends into the shell 21. For example, the shell 21 has a mounting hole 23, and a part of the pole tab 12 extends into the mounting hole 23. Part of the pole tab 12 is hidden in the shell 21. The pole tab 12 can utilize the space of the shell 21 to fully utilize the space, which is beneficial to reducing the size of the battery cell 100.

[0104] As shown in Figures 3 to 10, in some embodiments, the electrode assembly 20 includes a pole piece and a separator, which are stacked and wound to form the electrode assembly 20. The battery cell 100 includes two electrode assemblies 20. In the thickness direction F1 of the electrode assembly 20, the main body 11 has a first side 111 and a second side 112 arranged relatively to each other. The pole tab 12 is located between the first side 111 and the second side 112 and is adjacent to the first side 111. The two electrode assemblies 20 are arranged along the thickness direction F1 of the electrode assembly 20 and are symmetrically arranged along the center of the thickness direction F1 of the electrode assembly 20. The first sides 111 of the two main bodies 11 are arranged adjacent to each other.

[0105] The electrode assembly 20 is of a wound type. In the thickness direction F1 of the electrode assembly 20 (the front-to-back direction as shown in Figure 3), the main body 11 has a first side 111 and a second side 112, and the tab 12 is adjacent to the first side 111 of the main body 11. The two electrode assemblies 20 are arranged symmetrically, and the first sides 111 of the two main bodies 11 are arranged adjacent to each other. As a result, the tab 12 is located in the middle position of the top of the two electrode assemblies 20, which is conducive to the tab 12 extending into the mounting hole 23, so as to make full use of the space in the thickness direction F1 of the first wall 201 and realize full use of the space of the battery cell 100.

[0106] Figure 11 is a schematic diagram of a battery cell provided in other embodiments of the present application. As shown in Figure 11, in some embodiments, the electrode assembly 20 includes a pole piece and a diaphragm, and the pole piece and the diaphragm are stacked and wound to form the electrode assembly 20. The battery cell includes an electrode assembly 20. In the thickness direction F1 of the electrode assembly 20, the main body 11 has a first side 111 and a second side 112 arranged relatively, and the pole ear 12 is located between the first side 111 and the second side 112 and is spaced apart from the first side 111 and the second side 112.

[0107] The electrode assembly 20 is of a wound type. In the thickness direction F1 of the electrode assembly 20 (the front-to-back direction as shown in Figure 3), the main body 11 has a first side 111 and a second side 112, and the pole tab 12 is spaced apart from the first side 111, and the pole tab 12 is spaced apart from the second side 112. As a result, the pole tab 12 is located in the middle position of the top of the electrode assembly 20, which is conducive to the pole tab 12 extending into the mounting hole 23, so as to make full use of the space in the thickness direction F1 of the first wall 201 and realize full use of the space of the battery cell 100.

[0108] As shown in FIG6 , in some embodiments, the projection of the tab 12 on the first wall 201 is located within the mounting hole 23, so that the first end surface 121 of the tab 12 can be located as a whole within the mounting hole 23, thereby reducing the probability of interference between the tab 12 and other positions of the first wall 201, and the tab 12 can utilize the space of the first wall 201 to fully utilize the space.

[0109] The battery 1000 according to the second embodiment of the present application includes the battery cell 100 according to the first embodiment of the present application.

[0110] 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.

[0111] 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.

[0112] 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.

[0113] 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 .

[0114] As shown in Figures 3-5 and 8-10, 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 and seals the opening of the shell 21. The end cap 22 is provided with a first hole 2021. The electrode terminal 30 is mounted on the end cap 22 via a fixing member 50. A sealing ring 40 is provided between the lower surface of the electrode terminal 30 and the end cap 22. The sealing ring 40 engages with the edge of the mounting hole 23. A support member 80 is provided on the lower side of the end cap 22, and the support member 80 has a second hole 81.

[0115] Two electrode assemblies 10 are arranged in the shell 21. 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. The pole ear 12 protrudes from the main body 11 in the thickness direction F1 of the first wall 201. The pole ear 12 is adjacent to one side of the main body 11. When the two electrode assemblies 10 are assembled in the shell 21, the pole ear 12 is located in the middle position of the top of the two electrode assemblies 10.

[0116] A portion of the pole tab 12 passes through the second hole 81 of the support member 80, and the upper end of the pole tab 12 extends into the first hole 2021 of the end cover 22. The upper surface of the pole tab 12 is located on the lower side of the upper surface of the end cover 22, that is, part of the pole tab 12 is hidden in the end cover 22 and the support member 80. The pole tab 12 can utilize the space between the end cover 22 and the support member 80 to fully utilize the space, which is beneficial to reducing the size of the battery cell 100; the pole tab 12 is connected to the electrode terminal 30 through the adapter 70, and the projection of the electrode terminal 30 in the thickness direction F1 of the first wall 201 covers the projection of the pole tab 12 in the thickness direction F1, and the projection of the electrode terminal 30 in the thickness direction F1 covers the projection of the adapter 70 in the thickness direction F1. The adapter 70 can be hidden in the sealing ring 40. The pole tab 12, the adapter 70 and the sealing ring 40, the support member 80, and the end cover 22 occupy the same part of the space, which can further avoid the increase in the size of the battery cell 100.

[0117] 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, comprising a main body and a tab; a housing for accommodating the electrode assembly and comprising a first wall having a mounting hole; an electrode terminal, disposed on the first wall; At least a portion of the tab extends into the mounting hole, and a projection of the electrode terminal along the thickness direction of the first wall covers a projection of the tab along the thickness direction.

2. The battery cell according to claim 1, wherein: The first wall includes an end plate having the mounting hole.

3. The battery cell according to claim 1 or 2, wherein: The first wall includes an end plate and a support member, the end plate has a first hole, the support member is arranged between the end plate and the main body, the support member has a second hole, the second hole and the first hole correspond to each other in position and the first hole and the second hole form the mounting hole, and at least a portion of the tab extends into the second hole.

4. The battery cell according to any one of claims 1 to 3, wherein: The first wall includes an end plate and a support member, the end plate has a first hole, the support member is arranged between the end plate and the main body, the support member has a second hole, the second hole and the first hole correspond in position to each other and the first hole and the second hole form the mounting hole, and at least a portion of the tab extends into the second hole and the first hole.

5. The battery cell according to any one of claims 1 to 4, wherein: The tab is directly connected to the electrode terminal.

6. The battery cell according to any one of claims 1 to 4, wherein: The battery cell also includes: an adapter, which is arranged between the electrode terminal and the tab, and the electrode terminal and the tab are connected through the adapter. The projection of the electrode terminal along the thickness direction of the first wall covers the corresponding projection of the adapter along the thickness direction, and at least a portion of the adapter extends into the mounting hole.

7. The battery cell according to claim 6, wherein: The battery cell also includes a sealing ring, which is clamped between the electrode terminal and the first wall. In the thickness direction of the first wall, the sealing ring has a first end and a second end opposite to each other, and at least a portion of the adapter is located between the first end and the second end of the sealing ring.

8. The battery cell according to claim 1, 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.

9. The battery cell according to claim 8, wherein: The fixing member includes: a first fixing portion at least partially surrounding the electrode terminal to fix the electrode terminal to 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 electrode terminal. The main body is engaged with the first fixing portion, and the first connecting portion is engaged with the first wall.

10. The battery cell according to claim 8, 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 away from 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 the limiting step covers a portion of the electrode terminal.

11. The battery cell according to claim 8, wherein The outer surface of the first wall has an inwardly recessed mounting groove, the bottom of the mounting groove defines the mounting hole, and a portion of the fixing member is located in the mounting groove and fixedly connected to the housing.

12. The battery cell according to any one of claims 1 to 10, wherein: The housing 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, the first wall is the end cover, and / or the first wall is a part of the shell.

13. The battery cell according to any one of claims 1 to 12, wherein: The electrode assembly includes a pole piece and a diaphragm, and the pole piece and the diaphragm are stacked and wound to form the electrode assembly. The battery cell includes two electrode assemblies. In the thickness direction of the electrode assembly, the main body has a first side and a second side arranged opposite to each other, and the pole ear is located between the first side and the second side and adjacent to the first side. The two electrode assemblies are arranged along the thickness direction of the electrode assembly and are symmetrically arranged along the center of the thickness direction of the electrode assembly, and the first sides of the two main bodies are arranged adjacent to each other.

14. The battery cell according to any one of claims 1 to 12, wherein: The electrode assembly includes a pole piece and a diaphragm, and the pole piece and the diaphragm are stacked and wound to form the electrode assembly. The battery cell includes one electrode assembly. In the thickness direction of the electrode assembly, the main body has a first side and a second side arranged opposite to each other, and the pole tab is located between the first side and the second side and is spaced apart from both the first side and the second side.

15. The battery cell according to any one of claims 1 to 14, wherein: The projection of the tab on the first wall is located in the mounting hole.

16. A battery, wherein: The invention comprises a battery cell according to any one of claims 1 to 15.

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

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