Battery cell, battery and electric device

Abstract

The embodiment of the invention provides a battery monomer, a battery and a power utilization device. The battery cell includes a housing, an electrode assembly, an electrode terminal, a fixing member, and a sealing member. The shell comprises a first wall, and the first wall is provided with an electrode lead-out hole. The electrode assembly is housed within the housing. The electrode terminal is electrically connected to the electrode assembly and covers at least part of the electrode lead-out hole. The fixing piece is arranged around the electrode terminal and is used for connecting the electrode terminal and the first wall. The sealing member surrounds the electrode terminal, and at least part of the sealing member is clamped between the electrode terminal and the fixing member.

Description

Battery cells, batteries, and electrical devices Technical Field

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

[0002] Battery cells are widely used in electronic devices such as mobile phones, laptop computers, electric vehicles, electric cars, electric airplanes, electric boats, electric toy cars, electric toy boats, electric toy airplanes and power tools, etc.

[0003] In the development of battery technology, how to improve the reliability of battery cells is a research direction in battery technology.

[0004] Summary of the Invention

[0005] The present application provides a battery cell, a battery, and an electrical device, which can improve reliability.

[0006] In a first aspect, embodiments of the present application provide a battery cell comprising a housing, an electrode assembly, an electrode terminal, a fixing member, and a sealing member. The housing includes a first wall having an electrode lead-out hole defined therein. The electrode assembly is housed within the housing. The electrode terminal is electrically connected to the electrode assembly and covers at least a portion of the electrode lead-out hole. The fixing member is disposed around the electrode terminal and is configured to connect the electrode terminal to the first wall. The sealing member surrounds the electrode terminal, with at least a portion of the sealing member sandwiched between the electrode terminal and the fixing member.

[0007] By providing a fixing member to connect the electrode terminal and the first wall, and sandwiching at least a portion of the sealant between the electrode terminal and the fixing member, the force acting on the first wall is reduced while achieving sealing, reducing deformation of the shell and improving the reliability of the battery cell.

[0008] In some embodiments, the electrode terminal includes a terminal body and a first flange protruding from an outer circumferential surface of the terminal body, the sealing member surrounds the terminal body, and in the axial direction of the electrode lead-out hole, at least a portion of the sealing member is sandwiched between the first flange and the fixing member.

[0009] The provision of the first flange allows the electrode terminal and the fixing member to overlap in the axial direction of the electrode lead-out hole, thereby enabling the first flange and the fixing member to clamp the seal in the axial direction of the electrode lead-out hole. This method of clamping the seal in the axial direction of the electrode lead-out hole by the first flange and the fixing member is easy to implement and facilitates assembly.

[0010] In some embodiments, the electrode terminal further includes a second flange protruding from an outer peripheral surface of the terminal body. The first flange and the second flange are spaced apart in the axial direction, and at least a portion of the fixing member is located between the first flange and the second flange.

[0011] The first and second flanges can be positioned from both sides of the fixing member to achieve connection between the fixing member and the electrode terminal. When the first flange and the fixing member axially compress the seal, the reaction force exerted by the seal on the fixing member is generally transmitted axially to the second flange. The reaction force generated by the seal is also generally transmitted to the first and second flanges, thereby reducing the force acting on the first wall, minimizing deformation of the outer shell, and improving the reliability of the battery cell.

[0012] In some embodiments, in the axial direction of the electrode lead-out hole, the second flange is located on a side of the first flange facing away from the electrode assembly.

[0013] The portion of the seal sandwiched between the first flange and the fixing member is located on the inner side of the second flange, which can reduce the risk of the seal being exposed and slow down the aging of the seal.

[0014] In some embodiments, the battery cell further includes a first insulating member. In the axial direction of the electrode lead-out hole, at least a portion of the first insulating member is located between the second flange and the fixing member.

[0015] The first insulating member can insulate and isolate the second flange from the fixing member to reduce the risk of electrical conduction between the electrode terminal and the fixing member.

[0016] In some embodiments, the seal includes a sealing body and a first protrusion. The sealing body surrounds the terminal body, and the first protrusion protrudes from a surface of the sealing body facing the first flange. In the axial direction of the electrode lead-out hole, at least a portion of the sealing body is sandwiched between the first flange and the fixing member. At least a portion of the first flange is located between the first protrusion and the terminal body.

[0017] The portion of the seal body sandwiched between the first flange and the fixing member can be compressed to achieve a seal between the electrode terminal and the fixing member. During assembly of the electrode terminal and the seal, the first protrusion can cooperate with the first flange to position the seal radially relative to the electrode terminal, improving assembly efficiency and precision.

[0018] In some embodiments, the first flange is provided with a first recessed portion, the first recessed portion being recessed relative to a surface of the first flange facing the sealing body, and the first protrusion is received in the first recessed portion.

[0019] The first recess can provide an escape space for the first protrusion, reducing the risk of interference between the first protrusion and the first flange; in addition, by providing the first recess, the first flange and the first protrusion can share a space in the radial direction of the electrode terminal, thereby improving space utilization.

[0020] In some embodiments, the seal includes a sealing body and a second protrusion. The sealing body surrounds the terminal body, and the second protrusion protrudes from a surface of the sealing body facing away from the first flange. In the axial direction of the electrode lead-out hole, at least a portion of the sealing body is sandwiched between the first flange and the fixing member. The second protrusion is disposed between the fixing member and the terminal body.

[0021] The portion of the sealing body sandwiched between the first flange and the fixing member can be compressed to achieve a seal between the electrode terminal and the fixing member. During assembly, the second protrusion can position the fixing member to improve assembly efficiency and accuracy.

[0022] In some embodiments, in the axial direction of the electrode lead-out hole, the projection of the first flange is located within the projection of the electrode lead-out hole.

[0023] In the axial direction, the first flange and the first wall do not overlap, which can increase the creepage distance between the first flange and the first wall, improve the insulation between the first flange and the first wall, eliminate the insulation structure between the first flange and the first wall, reduce the overall weight, and improve the energy density.

[0024] In some embodiments, in the axial direction of the electrode lead-out hole, a projection of the first flange at least partially overlaps with a projection of the first wall. The battery cell further includes a second insulating member, the second insulating member being used to separate the first flange from the first wall.

[0025] The first wall can provide support for the first flange, thereby increasing the electrode terminal's ability to withstand axial forces and making the electrode terminal more stable. The second insulating member can separate the first flange from the first wall to reduce the risk of electrical conduction between the first flange and the first wall and improve insulation.

[0026] In some embodiments, the battery cell further includes a second insulating member, the second insulating member being used to at least separate the first flange from the fixing member.

[0027] The second insulating member can insulate the first flange from the fixing member to reduce the risk of electrical conduction between the electrode terminal and the fixing member.

[0028] In some embodiments, in the axial direction of the electrode lead-out hole, at least a portion of the second insulating member is disposed between the fixing member and the first flange.

[0029] The fixing member and the first flange can limit the second insulating member from both sides, thereby reducing the risk of the second insulating member being separated and improving the insulation performance.

[0030] In some embodiments, the electrode terminal has an end surface facing the electrode assembly, and the electrode terminal is provided with a second recessed portion that is recessed relative to and surrounds the end surface. The second recessed portion extends radially from the electrode terminal to the outer circumference of the first flange. The portion of the second insulating member housed in the second recessed portion separates the first flange from the first wall.

[0031] The provision of the second recess allows the second insulating member and the electrode terminal to share more space in the axial direction, reducing the extent of the electrode terminal protruding from the first wall and improving space utilization. Furthermore, the provision of the second recess increases the distance between the electrode terminal and the first wall, reducing the risk of electrical contact between the electrode terminal and the first wall.

[0032] In some embodiments, an inner diameter of the second recess is smaller than an inner diameter of the electrode lead-out hole.

[0033] The above technical solution can make the end face of the electrode terminal have a smaller size, thereby reducing the risk of the end face and the first wall overlapping in the axial direction and reducing the risk of the end face and the first wall being electrically connected.

[0034] In some embodiments, the first wall has a first surface facing the electrode assembly and a second surface facing away from the electrode assembly. Along a direction facing the electrode assembly, the electrode terminal does not extend beyond the first surface.

[0035] The above technical solution can reduce the size of the electrode terminal extending into the interior of the shell, reduce the internal space of the shell occupied by the electrode terminal, thereby reserving more space for the electrolyte and improving the cycle life and cycle performance of the battery cell.

[0036] In some embodiments, the first wall and the fixing member are provided separately.

[0037] Providing the first wall and the fixing piece separately can simplify the forming process of the first wall and the fixing piece, reduce the risk of the first wall interfering with the assembly of the fixing piece and the electrode terminal, and reduce the difficulty of assembly.

[0038] In some embodiments, the first wall has a first surface facing the electrode assembly and a second surface facing away from the electrode assembly. The first wall has a third recessed portion that is recessed relative to the second surface, and the electrode lead-out hole is provided at the bottom surface of the third recessed portion. The fixing member is at least partially accommodated in the third recessed portion.

[0039] The third recess reduces the protrusion of the fixing member beyond the first wall, thereby reducing the overall dimensions of the battery cell and increasing its energy density. The third recess also positions the fixing member, simplifying the connection process between the fixing member and the first wall.

[0040] In some embodiments, the fixing member has a connecting surface that abuts against the bottom surface of the third recess in the axial direction of the electrode lead-out hole and is flush with the end surface of the electrode terminal facing the electrode assembly.

[0041] The connection surface is flush with the end surface of the electrode terminal facing the electrode assembly, which can reduce the size of the electrode terminal extending into the electrode lead-out hole and reduce the internal space of the shell occupied by the electrode terminal.

[0042] In some embodiments, the fixing member is disposed on a side of the first wall facing away from the electrode assembly.

[0043] Arranging the fixing member on the side of the first wall facing away from the electrode assembly can reduce the internal space of the housing occupied by the fixing member.

[0044] In some embodiments, the fixing member includes a first connecting portion, a second connecting portion, and a bent portion; at least a portion of the electrode terminal is located on a side of the first connecting portion facing the electrode assembly and clamps the seal with the first connecting portion. The bent portion surrounds the outer periphery of the first connecting portion and bends toward the first wall; the second connecting portion surrounds the bent portion and is connected to the first wall.

[0045] By bending the fixing member, the distance between the electrode assembly and the first connecting portion can be increased, so that the sealing member and the electrode terminal can be arranged on the side of the first connecting portion facing the electrode assembly, thereby reducing the internal space of the housing occupied by the electrode terminal.

[0046] In some embodiments, the fixing member is integrally formed with the first wall.

[0047] Integrating the fixing member with the first wall can improve the connection strength between the first wall and the fixing member, thereby eliminating the connection process between the first wall and the fixing member.

[0048] In some embodiments, the housing includes a shell and an end cap, wherein the shell has an opening and the end cap is used to cover the opening. The end cap is the first wall.

[0049] The end cap may be a plate-like structure, and components such as electrode terminals and fixings can be easily installed on the end cap.

[0050] In some embodiments, in a plane parallel to the axial direction of the electrode lead-out hole, the orthographic projection of the electrode terminal covers the orthographic projection of the sealing member.

[0051] In the axial direction, the seal and the electrode terminal share a portion of the space, which can reduce the size of the electrode terminal protruding outside the first wall, improve space utilization, and increase the energy density of the battery cell.

[0052] In a second aspect, an embodiment of the present application provides a battery comprising a plurality of battery cells according to any one of the embodiments of the first aspect.

[0053] In a third aspect, an embodiment of the present application provides an electrical device, comprising a battery cell according to any embodiment of the first aspect, wherein the battery cell is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.

[0055] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0056] FIG2 is a schematic diagram of an explosion of a battery provided in some embodiments of the present application;

[0057] FIG3 is a schematic diagram of an explosion of a battery cell provided in some embodiments of the present application;

[0058] FIG4 is a schematic cross-sectional view of a battery cell provided in some embodiments of the present application;

[0059] FIG5 is an enlarged schematic diagram of block A in FIG4 ;

[0060] FIG6 is a cross-sectional schematic diagram of a terminal assembly of a battery cell provided in some embodiments of the present application;

[0061] FIG7 is an enlarged schematic diagram of FIG6 at the circle B;

[0062] FIG8 is a schematic cross-sectional view of a battery cell provided in some other embodiments of the present application;

[0063] FIG9 is an enlarged schematic diagram of block C in FIG8 ;

[0064] FIG10 is a schematic cross-sectional view of a terminal assembly of a battery cell provided in some other embodiments of the present application;

[0065] FIG11 is an enlarged schematic diagram of FIG10 at the circle D;

[0066] FIG12 is a schematic cross-sectional view of a terminal assembly of a battery cell provided in some other embodiments of the present application;

[0067] FIG13 is a schematic partial cross-sectional view of a battery cell provided in some other embodiments of the present application; FIG.

[0068] FIG14 is a schematic partial cross-sectional view of a battery cell provided in some further embodiments of the present application.

[0069] In the drawings, the drawings are not drawn to scale. DETAILED DESCRIPTION

[0070] 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.

[0071] 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 for the purpose of describing specific embodiments only 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" and "second" 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] The term "plurality" used in this application refers to two or more (including two).

[0077] In this application, battery cells may include lithium-ion secondary battery cells, lithium-ion primary battery cells, lithium-sulfur battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells, or magnesium-ion battery cells, and the embodiments of this application are not limited thereto. Battery cells may be cylindrical, flat, rectangular, or in other shapes, and the embodiments of this application are not limited thereto.

[0078] The battery mentioned in the embodiments of the present application may include one or more battery cells to provide a single physical module with higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, in parallel or in hybrid through a busbar.

[0079] In some embodiments, the battery may be a battery module; when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0080] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are housed in the case.

[0081] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0082] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0083] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are inserted and removed between the positive and negative electrodes. The separator, placed between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing the active ions to pass through.

[0084] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0085] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0086] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0087] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and modified compounds thereof. However, this application is not limited to these materials; other conventional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used singly or in combination of two or more.

[0088] In some embodiments, a positive electrode may be a metal foam. The metal foam may be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam, among others. When a metal foam is used as the positive electrode, the surface of the metal foam may or may not be provided with a positive electrode active material. For example, a lithium source material, potassium metal, or sodium metal may be filled and / or deposited within the metal foam, where the lithium source material is lithium metal and / or a lithium-rich material.

[0089] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0090] As an example, the negative electrode current collector may be a metal foil or a composite current collector. For example, the metal foil may be silver-surface-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium. The composite current collector may include a polymer base layer and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer substrate (such as a substrate made of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0091] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0092] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is provided on either or both of the two facing surfaces of the negative electrode current collector.

[0093] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate.

[0094] In some embodiments, the negative electrode may be a metal foam. The metal foam may be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam. When the metal foam is used as the negative electrode sheet, the surface of the metal foam may or may not be provided with a negative electrode active material.

[0095] As an example, the negative electrode current collector may be filled with or / and deposited with a lithium source material, potassium metal, or sodium metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0096] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0097] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0098] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical and mechanical stability can be selected.

[0099] As an example, the main material of the isolation membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics.

[0100] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0101] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not specifically limit the type of electrolyte, and the electrolyte can be selected based on needs. The electrolyte can be liquid, gel, or solid.

[0102] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0103] In some embodiments, the electrode assembly is a laminate structure.

[0104] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be provided respectively, and the multiple positive electrode sheets and the multiple negative electrode sheets can be alternately stacked.

[0105] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0106] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded segments.

[0107] As an example, a plurality of separators may be provided, each of which is disposed between any adjacent positive electrode sheets or negative electrode sheets.

[0108] As an example, the separator may be provided continuously, and may be provided between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0109] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0110] In some embodiments, the electrode assembly is provided with tabs that can conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0111] The battery cell also includes a housing, which has a housing formed inside for accommodating the electrode assembly. The housing can protect the electrode assembly from the outside to prevent external foreign matter from affecting the charging or discharging of the electrode assembly.

[0112] The battery cell also includes electrode terminals mounted on the housing, which are electrically connected to the electrode assembly. The electrode terminals can be used to electrically connect the electrode assembly to an external circuit to enable charging and discharging of the battery cell.

[0113] In the related art, the housing is usually provided with an electrode lead-out hole, and the electrode terminal covers at least a portion of the electrode lead-out hole. By providing the electrode lead-out hole, the electrode terminal can be electrically connected to the electrode assembly accommodated inside the housing.

[0114] To improve the reliability of battery cells, a sealant is usually provided to seal the electrode lead-out hole to reduce the risk of electrolyte leakage. In related art, the sealant is usually clamped between the electrode terminal and the outer shell, and the electrode terminal and the outer shell squeeze the sealant to seal the electrode lead-out hole.

[0115] However, the outer shell usually needs to directly squeeze the seal, which causes a large reaction force of the seal on the outer shell; as the battery cell is recycled, the outer shell is prone to deformation, affecting the reliability of the battery cell.

[0116] In view of this, an embodiment of the present application provides a technical solution, which connects the electrode terminal and the shell by setting a fixing part, and clamps at least part of the seal between the electrode terminal and the fixing part to reduce the force acting on the shell, reduce the deformation of the shell, and improve the reliability of the battery cell.

[0117] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical devices using batteries.

[0118] Electrical devices may include vehicles, mobile phones, portable devices, laptop computers, ships, spacecraft, electric toys, and electric tools, etc. Vehicles may be fuel vehicles, gas vehicles, or new energy vehicles. New energy vehicles may be pure electric vehicles, hybrid vehicles, or extended-range vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0119] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device.

[0120] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application.

[0121] As shown in FIG1 , a battery 2 is provided inside the vehicle 1. The battery 2 may be provided at the bottom, head, or tail of the vehicle 1. The battery 2 may be used to power the vehicle 1. For example, the battery 2 may serve as an operating power source for the vehicle 1.

[0122] The vehicle 1 may further include a controller 3 and a motor 4 . The controller 3 is used to control the battery 2 to supply power to the motor 4 , for example, to meet the power requirements of the vehicle 1 during startup, navigation, and driving.

[0123] In some embodiments of the present application, the battery 2 can not only serve as the operating power source of the vehicle 1, but also serve as the driving power source of the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0124] FIG2 is a schematic diagram of an explosion of a battery provided in some embodiments of the present application.

[0125] As shown in FIG. 2 , the battery 2 includes a case 5 and battery cells 6 (not shown). The battery cells 6 are accommodated in the case 5 .

[0126] The housing 5 is used to house the battery cells 6 and can have various structures. In some embodiments, the housing 5 can include a first housing portion 5a and a second housing portion 5b. The first housing portion 5a and the second housing portion 5b overlap each other and together define a storage space 5c for accommodating the battery cells 6. The second housing portion 5b can be a hollow structure with one end open. The first housing portion 5a is a plate-like structure, and the first housing portion 5a overlaps the open side of the second housing portion 5b to form the housing 5 with the storage space 5c. Alternatively, both the first housing portion 5a and the second housing portion 5b can be hollow structures with one end open. The open side of the first housing portion 5a overlaps the open side of the second housing portion 5b to form the housing 5 with the storage space 5c. Of course, the first housing portion 5a and the second housing portion 5b can have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0127] In order to improve the sealing performance after the first box body 5a and the second box body 5b are connected, a sealing member, such as a sealant, a sealing ring, etc., may also be provided between the first box body 5a and the second box body 5b.

[0128] Assuming that the first box body portion 5a covers the top of the second box body portion 5b, the first box body portion 5a can also be called an upper box cover, and the second box body portion 5b can also be called a lower box body.

[0129] In the battery 2, there can be one or more battery cells 6. If there are multiple battery cells 6, the multiple battery cells 6 can be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections within the multiple battery cells 6. The multiple battery cells 6 can be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell 6 can be housed within the housing 5. Alternatively, multiple battery cells 6 can be first connected in series, in parallel, or in a hybrid connection to form a battery module, and then the multiple battery modules can be connected in series, in parallel, or in a hybrid connection to form a single unit and housed within the housing 5.

[0130] Figure 3 is an exploded schematic diagram of a battery cell provided in some embodiments of the present application; Figure 4 is a cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application; Figure 5 is an enlarged schematic diagram of box A in Figure 4; Figure 6 is a cross-sectional schematic diagram of a terminal assembly of a battery cell provided in some embodiments of the present application; Figure 7 is an enlarged schematic diagram of box B in Figure 6.

[0131] 3 to 7 , an embodiment of the present application provides a battery cell 6, which includes a housing 20, an electrode assembly 10, an electrode terminal 30, a fixing member 40, and a sealing member 50. The housing 20 includes a first wall 21, which is provided with an electrode lead-out hole 211. The electrode terminal 30 is electrically connected to the electrode assembly 10 and covers at least a portion of the electrode lead-out hole 211. The fixing member 40 is arranged around the electrode terminal 30 and is used to connect the electrode terminal 30 and the first wall 21. The sealing member 50 surrounds the electrode terminal 30, and at least a portion of the sealing member 50 is sandwiched between the electrode terminal 30 and the fixing member 40.

[0132] The housing 20 is a hollow structure, forming a space within which the electrode assembly 10 and the electrolyte are housed. The shape of the housing 20 can be determined based on the specific shape of the electrode assembly 10. For example, if the electrode assembly 10 is a rectangular parallelepiped structure, a rectangular housing can be used; if the electrode assembly 10 is a cylindrical structure, a cylindrical housing can be used.

[0133] The material of the housing 20 can be various, for example, the material of the housing 20 can be metal or plastic. Alternatively, the material of the housing 20 can be copper, iron, aluminum, steel, aluminum alloy, etc.

[0134] The first wall 21 is a wall of the housing 20 with a certain thickness. It can be the top wall of the housing 20 , the bottom wall of the housing 20 , or the side wall of the housing 20 . This embodiment of the present application does not limit this.

[0135] The electrode lead-out hole 211 passes through the first wall 21 to connect the inner and outer spaces of the housing 20, thereby facilitating the extraction of the electrical energy generated by the electrode assembly 10 out of the housing 20. Optionally, the electrode lead-out hole 211 passes through the first wall 21 along its thickness direction.

[0136] There may be one or more electrode assemblies 10. When there are multiple electrode assemblies 10, the multiple electrode assemblies 10 may be stacked. For example, as shown in FIG3 , there are two electrode assemblies 10.

[0137] The electrode terminal 30 is used to electrically connect the electrode assembly 10 to a circuit outside the battery cell 6 to achieve charging and discharging.

[0138] There may be one or more electrode terminals 30. In some examples, there is one electrode terminal 30, with one of the electrode terminal 30 and the housing 20 electrically connected to the positive electrode sheet, and the other electrically connected to the negative electrode sheet. The electrode terminal 30 and the housing 20 serve as two output electrodes of the battery cell 6. In other examples, there are two electrode terminals 30, with one electrode terminal 30 electrically connected to the positive electrode sheet and the other electrode terminal 30 electrically connected to the negative electrode sheet.

[0139] In the axial direction Z of the electrode lead-out hole 211, the projection of the electrode terminal 30 at least partially overlaps with the projection of the electrode lead-out hole 211. In some examples, in the axial direction Z of the electrode lead-out hole 211, the projection of the electrode terminal 30 is located within the projection of the electrode lead-out hole 211; in other examples, in the axial direction Z of the electrode lead-out hole 211, a portion of the projection of the electrode terminal 30 is located within the projection of the electrode lead-out hole 211, and another portion is located outside the projection of the electrode lead-out hole 211.

[0140] In some examples, the electrode terminal 30 is entirely located on the outside of the first wall 21 and covers at least a portion of the electrode lead-out hole 211 from the outside; in other examples, the electrode terminal 30 is entirely located on the inside of the first wall 21 and covers at least a portion of the electrode lead-out hole 211 from the inside; in still other examples, a portion of the electrode terminal 30 is located on the outside of the first wall 21, and a portion is accommodated in the electrode lead-out hole 211.

[0141] The fixing member 40 is an annular structure, which encloses and forms an accommodation space. At least a portion of the electrode terminal 30 is accommodated in the accommodation space of the fixing member 40 .

[0142] The embodiment of the present application does not limit the connection method between the fixing member 40 and the electrode terminal 30. For example, the fixing member 40 can be directly connected to the electrode terminal 30 or indirectly connected to the electrode terminal 30 through other components.

[0143] The embodiments of the present application do not limit the connection method between the fixing member 40 and the first wall 21. In some examples, the fixing member 40 and the first wall 21 are integrally formed; in other examples, the fixing member 40 and the first wall 21 are formed separately and connected by bonding, clamping, welding, or other methods.

[0144] The portion of the sealant 50 sandwiched between the electrode terminal 30 and the fixing member 40 can seal the gap between the electrode terminal 30 and the fixing member 40. For example, the sealant 50, the electrode terminal 30, and the fixing member 40 seal the electrode lead-out hole 211 together.

[0145] The sealing member 50 may be an annular structure. For example, the sealing member 50 may be disposed between the electrode terminal 30 and the fixing member 40 in the radial direction of the electrode terminal 30 or in the axial direction Z of the electrode terminal 30 .

[0146] In an embodiment of the present application, a fixing member 40 is provided to connect the electrode terminal 30 and the first wall 21, and at least a portion of the sealing member 50 is clamped between the electrode terminal 30 and the fixing member 40, so as to reduce the force acting on the first wall 21 while achieving sealing, reduce the deformation of the outer shell 20, and improve the reliability of the battery cell 6.

[0147] In some embodiments, the housing 20 includes a shell 20 a and an end cover 20 b . The shell 20 a has an opening, and the end cover 20 b is used to cover the opening.

[0148] The housing 20 a is a component used to cooperate with the end cover 20 b to form an internal cavity of the battery cell 6 . The formed internal cavity can be used to accommodate the electrode assembly 10 , electrolyte, and other components.

[0149] The housing 20a and the end cap 20b may be separate components. For example, an opening may be provided on the housing 20a, and the end cap 20b may be placed over the opening to form an internal cavity of the battery cell 6.

[0150] The housing 20a can have various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the housing 20a can be determined according to the specific shape and size of the electrode assembly 10. The housing 20a can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., and the present embodiment does not impose any particular limitation on this.

[0151] The shape of the end cap 20b can be adapted to the shape of the housing 20a to fit the housing 20a. Optionally, the end cap 20b can be made of a material with a certain hardness and strength (such as an aluminum alloy). In this way, the end cap 20b is less likely to deform when squeezed or collided, thereby providing the battery cell 6 with higher structural strength and improved reliability.

[0152] The end cover 20b is connected to the housing 20a by welding, bonding, clamping or other means.

[0153] In some examples, the housing 20a may be open on one side, with one end cap 20b provided and covering the housing 20a. In other examples, the housing 20a may be open on both sides, with two end caps 20b provided, each covering the two openings of the housing 20a.

[0154] In some examples, the end cap 20 b may be the first wall 21 ; in another example, one wall of the housing 20 a may be the end cap 20 b , for example, the bottom wall of the housing 20 a opposite to the end cap 20 b may be the first wall 21 .

[0155] In some embodiments, the end cap 20b is the first wall 21. The end cap 20b may be a plate-like structure, and components such as the electrode terminal 30 and the fixing member 40 are easily mounted on the end cap 20b.

[0156] In some embodiments, in a plane parallel to the axial direction Z of the electrode lead-out hole 211 , the orthographic projection of the electrode terminal 30 covers the orthographic projection of the sealing member 50 .

[0157] In the axial direction Z, the seal 50 and the electrode terminal 30 share part of the space, which can reduce the size of the electrode terminal 30 protruding outside the first wall 21, improve space utilization, and increase the energy density of the battery cell 6.

[0158] In some embodiments, the electrode terminal 30 includes a terminal body 31 and a first flange 32 protruding from an outer peripheral surface 311 of the terminal body. The sealing member 50 surrounds the terminal body 31. In the axial direction Z of the electrode lead-out hole 211, at least a portion of the sealing member 50 is sandwiched between the first flange 32 and the fixing member 40.

[0159] There can be one or more first flanges 32. In some examples, there is one first flange 32 that surrounds the terminal body 31. In other examples, there are multiple first flanges 32 that are spaced apart along the circumference of the terminal body 31.

[0160] In some examples, on the axial direction Z of the electrode lead-out hole 211, the projection of the first flange 32 is located within the projection of the electrode lead-out hole 211; in other examples, on the axial direction Z of the electrode lead-out hole 211, a portion of the projection of the first flange 32 is located within the projection of the electrode lead-out hole 211, and the other portion is located outside the projection of the electrode lead-out hole 211.

[0161] The first flange 32 may be located inside the electrode lead-out hole 211 or outside the electrode lead-out hole 211. Alternatively, the first flange 32 may be accommodated in the electrode lead-out hole 211.

[0162] In the axial direction Z of the electrode lead-out hole 211 , only a portion of the sealing member 50 may be sandwiched between the first flange 32 and the fixing member 40 , or the entire sealing member 50 may be sandwiched between the first flange 32 and the fixing member 40 .

[0163] By providing the first flange 32, the electrode terminal 30 and the fixing member 40 can overlap in the axial direction Z of the electrode lead-out hole 211, thereby enabling the first flange 32 and the fixing member 40 to clamp the sealing member 50 in the axial direction Z of the electrode lead-out hole 211. The manner in which the first flange 32 and the fixing member 40 clamp the sealing member 50 in the axial direction Z of the electrode lead-out hole 211 is easy to implement and facilitates assembly.

[0164] In some embodiments, the electrode terminal 30 further includes a second flange 33 that protrudes from the outer peripheral surface 311 of the terminal body. The first flange 32 and the second flange 33 are spaced apart in the axial direction Z, and at least a portion of the fixing member 40 is located between the first flange 32 and the second flange 33.

[0165] In some examples, the first flange 32 may be located on a side of the second flange 33 close to the electrode assembly 10 ; in other examples, the first flange 32 may be located on a side of the second flange 33 away from the electrode assembly 10 .

[0166] There can be one or more second flanges 33. In some examples, there is one second flange 33, and the second flange 33 surrounds the terminal body 31. In other examples, there are multiple second flanges 33, and the multiple second flanges 33 are spaced apart along the circumference of the terminal body 31.

[0167] The first flange 32 and the second flange 33 can be positioned from both sides of the fixing member 40, thereby achieving connection between the fixing member 40 and the electrode terminal 30. When the first flange 32 and the fixing member 40 compress the seal along the axial direction Z, the reaction force exerted by the seal on the fixing member 40 is generally transmitted to the second flange 33 along the axial direction Z. In other words, the reaction force generated by the seal is generally transmitted to the first flange 32 and the second flange 33, thereby reducing the force acting on the first wall 21, reducing deformation of the outer shell 20, and improving the reliability of the battery cell 6.

[0168] In some embodiments, in the axial direction Z of the electrode lead-out hole 211 , the second flange 33 is located on a side of the first flange 32 facing away from the electrode assembly 10 .

[0169] The portion of the sealing member 50 sandwiched between the first flange 32 and the fixing member 40 is located on the inner side of the second flange 33 , which can reduce the risk of the sealing member 50 being exposed and slow down the aging of the sealing member 50 .

[0170] In some embodiments, the battery cell 6 further includes a first insulating member 60 . In the axial direction Z of the electrode lead-out hole 211 , at least a portion of the first insulating member 60 is located between the second flange 33 and the fixing member 40 .

[0171] The first insulating member 60 can insulate and isolate the second flange 33 from the fixing member 40 to reduce the risk of electrical conduction between the electrode terminal 30 and the fixing member 40 .

[0172] In some embodiments, the seal 50 includes a seal body 51 and a first protrusion 52. The seal body 51 surrounds the terminal body 31, and the first protrusion 52 protrudes from the surface of the seal body 51 facing the first flange 32. In the axial direction Z of the electrode lead-out hole 211, at least a portion of the seal body 51 is sandwiched between the first flange 32 and the fixing member 40. At least a portion of the first flange 32 is located between the first protrusion 52 and the terminal body 31.

[0173] There can be one or more first protrusions 52 . In some examples, there is one first protrusion 52 that surrounds the first flange 32 . In another example, there are multiple first protrusions 52 that are spaced apart along the circumference of the terminal body 31 .

[0174] Illustratively, in the radial direction of the electrode terminal 30 , at least a portion of the first flange 32 is located between the first protrusion 52 and the terminal body 31 .

[0175] The portion of the sealing body 51 sandwiched between the first flange 32 and the fixing member 40 can be compressed to achieve a seal between the electrode terminal 30 and the fixing member 40. When assembling the electrode terminal 30 and the sealing member 50, the first protrusion 52 can cooperate with the first flange 32 to achieve radial positioning of the sealing member 50 with respect to the electrode terminal 30, thereby improving assembly efficiency and accuracy.

[0176] In some embodiments, the first flange 32 is provided with a first recess 321 , which is recessed relative to a surface of the first flange 32 facing the sealing body 51 . The first protrusion 52 is received in the first recess 321 .

[0177] The first recess 321 can provide an escape space for the first protrusion 52, reducing the risk of interference between the first protrusion 52 and the first flange 32; in addition, by providing the first recess 321, the first flange 32 and the first protrusion 52 can share a space in the radial direction of the electrode terminal 30, thereby improving space utilization.

[0178] In some embodiments, in the axial direction Z of the electrode lead-out hole 211 , the projection of the first flange 32 is located within the projection of the electrode lead-out hole 211 .

[0179] In the axial direction Z, the first flange 32 and the first wall 21 do not overlap, which can increase the creepage distance between the first flange 32 and the first wall 21, improve the insulation between the first flange 32 and the first wall 21, eliminate the insulation structure between the first flange 32 and the first wall 21, reduce the overall weight, and improve the energy density.

[0180] For example, when the size of the electrode terminal 30 is constant, the present application can increase the diameter of the electrode lead-out hole 211 so that the projection of the first flange 32 along the axial direction Z is located within the projection of the electrode lead-out hole 211 along the axial direction Z. Increasing the diameter of the electrode lead-out hole 211 can reduce the total weight of the housing 20.

[0181] In some embodiments, in the axial direction Z of the electrode lead-out hole 211 , the projection of the electrode terminal 30 is located within the projection of the electrode lead-out hole 211 .

[0182] In some embodiments, the battery cell 6 further includes a second insulating member 70 , which is at least used to separate the first flange 32 from the fixing member 40 .

[0183] For example, the fixing member 40 may be made of a metal material with relatively high strength.

[0184] The second insulating member 70 can insulate and isolate the first flange 32 from the fixing member 40 to reduce the risk of electrical conduction between the electrode terminal 30 and the fixing member 40 .

[0185] In some embodiments, in the axial direction Z of the electrode lead-out hole 211 , at least a portion of the second insulating member 70 is disposed between the fixing member 40 and the first flange 32 .

[0186] The fixing member 40 and the first flange 32 can restrict the second insulating member 70 from both sides, thereby reducing the risk of the second insulating member 70 being separated and improving the insulation performance.

[0187] In some embodiments, in the axial direction Z of the electrode lead-out hole 211 , at least a portion of the second insulating member 70 is disposed between the fixing member 40 and the bottom surface of the first recess 321 .

[0188] In some embodiments, the first wall 21 has a first surface 212 facing the electrode assembly 10 and a second surface 213 facing away from the electrode assembly 10. The electrode terminal 30 does not extend beyond the first surface 212 in a direction facing the electrode assembly 10.

[0189] The present application can reduce the size of the electrode terminal 30 extending into the interior of the housing 20 and reduce the internal space of the housing 20 occupied by the electrode terminal 30, thereby reserving more space for the electrolyte and improving the cycle life and cycle performance of the battery cell 6.

[0190] In some embodiments, the first surface 212 and the second surface 213 are both planes. Optionally, the first surface 212 is parallel to the second surface 213 .

[0191] In some embodiments, the battery cell 6 further includes an insulating plastic 80 , which is attached to the first surface 212 .

[0192] In some embodiments, the first wall 21 and the fixing member 40 are provided separately.

[0193] The first wall 21 and the fixing member 40 may be connected by welding, bonding, riveting or other methods.

[0194] Separately providing the first wall 21 and the fixing member 40 can simplify the forming process of the first wall 21 and the fixing member 40 , reduce the risk of the first wall 21 interfering with the assembly of the fixing member 40 and the electrode terminal 30 , and reduce the difficulty of assembly.

[0195] In some embodiments, the first wall 21 has a first surface 212 facing the electrode assembly 10 and a second surface 213 facing away from the electrode assembly 10. The first wall 21 has a third recess 214 recessed relative to the second surface 213. The electrode lead-out hole 211 is provided at the bottom surface 214a of the third recess. At least a portion of the fixing member 40 is accommodated in the third recess 214.

[0196] Exemplarily, the electrode lead-out hole 211 passes through the portion of the first wall 21 between the bottom surface 214a of the third recess and the first surface 212. In other words, both ends of the electrode lead-out hole 211 open on the bottom surface 214a of the third recess and the first surface 212, respectively.

[0197] The third recess 214 may be a cylindrical recess, a conical recess, a stepped recess, or a recess of other shapes.

[0198] The provision of the third recess 214 reduces the protrusion of the fixing member 40 beyond the first wall 21, thereby reducing the overall dimensions of the battery cell 6 and increasing the energy density of the battery cell 6. The third recess 214 also positions the fixing member 40, simplifying the connection process between the fixing member 40 and the first wall 21.

[0199] In some embodiments, the third recess 214 is a stepped recess.

[0200] In some embodiments, the fixing member 40 has a connecting surface 40a that abuts against the bottom surface 214a of the third recess in the axial direction Z of the electrode lead-out hole 211 . The connecting surface 40a is flush with the end surface 30a of the electrode terminal 30 facing the electrode assembly 10 .

[0201] Exemplarily, the fixing member 40 and the first wall 21 are arranged along the axial direction Z of the electrode lead-out hole 211 .

[0202] The connection surface 40 a is flush with the end surface 30 a of the electrode terminal 30 facing the electrode assembly 10 , which can reduce the size of the electrode terminal 30 extending into the electrode lead-out hole 211 and reduce the internal space occupied by the electrode terminal 30 in the housing 20 .

[0203] In some embodiments, the connection surface 40 a , the end surface 30 a of the electrode terminal 30 facing the electrode assembly 10 , and the surface of the second insulating member 70 facing the electrode assembly 10 are flush.

[0204] In some embodiments, the fixing member 40 is disposed on a side of the first wall 21 facing away from the electrode assembly 10 .

[0205] The embodiment of the present application does not require that the entire fixing member 40 protrudes from the second surface 213 ; only a portion of the fixing member 40 may protrude from the second surface 213 .

[0206] In the embodiment of the present application, the fixing member 40 is disposed on the side of the first wall 21 facing away from the electrode assembly 10 , which can reduce the internal space of the housing 20 occupied by the fixing member 40 .

[0207] In some embodiments, the fixing member 40 includes a first connecting portion 41, a second connecting portion 42, and a bent portion 43. At least a portion of the electrode terminal 30 is located on the side of the first connecting portion 41 facing the electrode assembly 10 and sandwiches the sealing member 50 with the first connecting portion 41. The bent portion 43 surrounds the outer periphery of the first connecting portion 41 and bends toward the first wall 21. The second connecting portion 42 surrounds the bent portion 43 and is connected to the first wall 21.

[0208] By bending the fixing member 40 , the distance between the electrode assembly 10 and the first connecting portion 41 can be increased, so that the sealing member 50 and the electrode terminal 30 can be arranged on the side of the first connecting portion 41 facing the electrode assembly 10 , thereby reducing the internal space of the outer shell 20 occupied by the electrode terminal 30 .

[0209] Compared with the solution of clamping the seal 50 between the first wall 21 and the first flange 32, the embodiment of the present application sets the seal 50 between the first flange 32 and the first connecting portion 41, so that the seal 50 and the electrode terminal 30 can share space in the axial direction Z, thereby reducing the size of the second surface 213 of the electrode terminal 30 protruding from the first wall 21 and improving the energy density.

[0210] In some embodiments, the first connection portion 41 encloses a through hole, and the terminal body 31 passes through the through hole.

[0211] In some embodiments, the second connecting portion 42 is received in the third recess 214 .

[0212] In some embodiments, the second connecting portion 42 includes a connecting surface 40 a that abuts against the bottom surface 214 a of the third recess.

[0213] In some embodiments, the first insulating member 60 includes a first insulating portion 61, a second insulating portion 62, and a third insulating portion 63. The first insulating portion 61 is clamped between the first flange 32 and the first connecting portion 41 in the axial direction Z. At least a portion of the third insulating portion 63 is clamped between the second flange 33 and the first connecting portion 41 in the axial direction Z. The second insulating portion 62 connects the first insulating portion 61 and the third insulating portion 63 and separates the terminal body 31 from the first connecting portion 41.

[0214] The first connection portion 41 and the first flange 32 clamp the first insulating portion 61 , thereby reducing the risk of the first insulating member 60 being separated from the electrode terminal 30 .

[0215] Optionally, the third insulating portion 63 covers the outer surface of the first connecting portion 41 and the outer surface of the bending portion 43 .

[0216] In some embodiments, the first insulating member 60 and the second insulating member 70 are both made of plastic.

[0217] In some embodiments, the battery cell 6 includes a terminal assembly 7 , which includes an electrode terminal 30 , a fixing member 40 , a sealing member 50 , a first insulating member 60 , and a second insulating member 70 .

[0218] Exemplarily, the terminal assembly 7 can be assembled in the following manner: provide an electrode terminal 30, and the second flange 33 of the electrode terminal 30 is not formed; put the seal 50 on the terminal body 31 and place it on the first flange 32; install the fixing member 40, so that the electrode terminal 30 passes through the fixing member 40, and the first connecting part 41 and the first flange 32 of the fixing member 40 squeeze the seal 50 so that the compression amount of the seal 50 meets the requirements; form the first insulating member 60 and the second insulating member 70 by injection molding; extrude the electrode terminal 30 and form the second flange 33, so that the electrode terminal 30 is riveted to the fixing member 40.

[0219] The second flange 33 can limit the third insulating portion 63 to reduce the risk of the third insulating portion 63 tilting.

[0220] In some embodiments, the battery cell 6 further includes a switching piece 90 , which is used to electrically connect the electrode terminal 30 and the tab of the electrode assembly 10 .

[0221] In some embodiments, the transfer piece 90 abuts against and connects to the end surface 30 a of the electrode terminal 30 .

[0222] In some embodiments, a portion of the adapter plate 90 is accommodated in the electrode lead-out hole 211 .

[0223] Figure 8 is a cross-sectional schematic diagram of a battery cell provided in other embodiments of the present application; Figure 9 is an enlarged schematic diagram of box C in Figure 8; Figure 10 is a cross-sectional schematic diagram of a terminal assembly of a battery cell provided in other embodiments of the present application; Figure 11 is an enlarged schematic diagram of box D in Figure 10.

[0224] 8 to 11 , in some embodiments, the seal 50 includes a seal body 51 and a second protrusion 53. The seal body 51 surrounds the terminal body 31, and the second protrusion 53 protrudes from a surface of the seal body 51 facing away from the first flange 32. In the axial direction Z of the electrode lead-out hole 211, at least a portion of the seal body 51 is sandwiched between the first flange 32 and the fixing member 40. The second protrusion 53 is provided between the fixing member 40 and the terminal body 31.

[0225] There may be one or more second protrusions 53. In some examples, there is one second protrusion 53 that surrounds the terminal body 31; in another example, there are multiple second protrusions 53 that are spaced apart along the circumference of the terminal body 31.

[0226] In the radial direction of the electrode terminal 30 , the second protrusion 53 is provided between the fixing member 40 and the terminal body 31 .

[0227] The portion of the sealing body 51 sandwiched between the first flange 32 and the fixing member 40 can be compressed to achieve a seal between the electrode terminal 30 and the fixing member 40. During assembly, the second protrusion 53 can position the fixing member 40 to improve assembly efficiency and accuracy.

[0228] In some embodiments, in the radial direction of the electrode terminal 30, the second protrusion 53 is clamped between the fixing member 40 and the terminal body 31. The second protrusion 53 is compressed to improve the sealing performance.

[0229] In some embodiments, the projection of the first flange 32 at least partially overlaps the projection of the first wall 21 in the axial direction Z of the electrode lead-out hole 211 . The battery cell 6 further includes a second insulating member 70 for separating the first flange 32 from the first wall 21 .

[0230] The first wall 21 can provide support for the first flange 32, thereby increasing the force-bearing capacity of the electrode terminal 30 in the axial direction Z and making the electrode terminal 30 more stable. The second insulating member 70 can separate the first flange 32 from the first wall 21 to reduce the risk of electrical conduction between the first flange 32 and the first wall 21 and improve insulation.

[0231] In some embodiments, the electrode terminal 30 has an end surface 30a facing the electrode assembly 10, and the electrode terminal 30 is provided with a second recessed portion 34 that is recessed relative to and surrounds the end surface 30a. The second recessed portion 34 extends radially from the electrode terminal 30 to the outer peripheral surface 322 of the first flange. The portion of the second insulating member 70 received in the second recessed portion 34 separates the first flange 32 from the first wall 21.

[0232] In the axial direction Z of the electrode lead-out hole 211, the end surface 30a of the electrode terminal 30 is the surface of the electrode terminal 30 closest to the electrode assembly 10. Exemplarily, the end surface 30a is a plane.

[0233] The provision of the second recess 34 allows the second insulating member 70 and the electrode terminal 30 to share more space in the axial direction Z, reducing the extent of the electrode terminal 30 protruding from the first wall 21 and improving space utilization. Furthermore, the provision of the second recess 34 increases the distance between the electrode terminal 30 and the first wall 21, reducing the risk of electrical contact between the electrode terminal 30 and the first wall 21.

[0234] By providing the second recess 34 , the weight of the entire terminal assembly 7 can be reduced.

[0235] In some embodiments, the inner diameter R1 of the second recess 34 is smaller than the inner diameter R2 of the electrode lead-out hole 211 .

[0236] The embodiment of the present application can make the end surface 30 a of the electrode terminal 30 have a smaller size, thereby reducing the risk of the end surface 30 a overlapping with the first wall 21 in the axial direction Z and reducing the risk of electrical connection between the end surface 30 a and the first wall 21 .

[0237] In some embodiments, a projection of the end surface 30 a of the electrode terminal 30 along the axial direction Z is located within a projection of the electrode lead-out hole 211 along the axial direction Z.

[0238] In some embodiments, the cross-section of the second insulating member 70 may be C-shaped. The C-shaped structure covers the edge of the first flange 32 , which improves insulation while reducing the risk of the second insulating member 70 falling off the electrode terminal 30 .

[0239] FIG12 is a schematic cross-sectional view of a terminal assembly of a battery cell provided in some other embodiments of the present application.

[0240] As shown in FIG12 , in some embodiments, the sealing member 50 may include a sealing body 51, a first protrusion 52, and a second protrusion 53. The sealing body 51 surrounds the terminal body 31, and the first protrusion 52 protrudes from the surface of the sealing body 51 facing the first flange 32. In the axial direction Z of the electrode lead-out hole 211, at least a portion of the sealing body 51 is sandwiched between the first flange 32 and the fixing member 40. At least a portion of the first flange 32 is located between the first protrusion 52 and the terminal body 31. The second protrusion 53 protrudes from the surface of the sealing body 51 facing away from the first flange 32 and is located between the fixing member 40 and the terminal body 31.

[0241] The embodiments of the present application can improve the sealing performance.

[0242] FIG13 is a schematic partial cross-sectional view of a battery cell provided in some other embodiments of the present application.

[0243] As shown in FIG. 13 , in some embodiments, a portion of the electrode terminal 30 may be accommodated in the electrode lead-out hole 211 .

[0244] In some embodiments, the electrode terminal 30 may also extend beyond the first surface 212 of the first wall 21 in a direction approaching the electrode assembly 10 .

[0245] In the embodiment of the present application, the electrode assembly 10 may also extend into the interior of the housing 20 , which can simplify the structure of the adapter 90 .

[0246] FIG14 is a schematic partial cross-sectional view of a battery cell provided in some further embodiments of the present application.

[0247] As shown in FIG. 14 , in some embodiments, the fixing member 40 and the first wall 21 are integrally formed.

[0248] Integrating the fixing member 40 with the first wall 21 can improve the connection strength between the first wall 21 and the fixing member 40 , thereby eliminating the need for a connection step between the first wall 21 and the fixing member 40 .

[0249] According to some embodiments of the present application, the present application also provides a battery comprising a plurality of battery cells according to any of the above embodiments.

[0250] According to some embodiments of the present application, the present application further provides an electrical device comprising a battery cell according to any of the above embodiments, the battery cell being used to provide electrical energy to the electrical device. The electrical device may be any of the aforementioned devices or systems using the battery cell.

[0251] Referring to Figures 4 to 7, one embodiment of the present application provides a battery cell 6, which includes a housing 20, an electrode assembly 10, an electrode terminal 30, a fixing member 40, a sealing member 50, a first insulating member 60, and a second insulating member 70. The housing 20 includes a shell 20a and an end cap 20b. The shell 20a has an opening, and the end cap 20b is used to cover the opening. The end cap 20b is provided with an electrode lead-out hole 211.

[0252] The electrode terminal 30 is electrically connected to the electrode assembly 10 and covers at least a portion of the electrode lead-out hole 211. The fixing member 40 is disposed around the electrode terminal 30 and is used to connect the electrode terminal 30 and the end cap 20b.

[0253] In the axial direction Z of the electrode lead-out hole 211, the projection of the electrode terminal 30 is located within the projection of the electrode lead-out hole 211. The end cap 20b has a first surface 212 facing the electrode assembly 10 and a second surface 213 facing away from the electrode assembly 10. In the direction facing the electrode assembly 10, the electrode terminal 30 does not extend beyond the first surface 212.

[0254] The electrode terminal 30 includes a terminal body 31, a first flange 32, and a second flange 33. The first flange 32 and the second flange 33 both protrude from the outer peripheral surface 311 of the terminal body. In the axial direction Z of the electrode lead-out hole 211, at least a portion of the fixing member 40 is located between the first flange 32 and the second flange 33.

[0255] The sealing member 50 surrounds the terminal body 31. In the axial direction Z of the electrode lead-out hole 211, at least a portion of the sealing member 50 is sandwiched between the first flange 32 and the fixing member 40. In the axial direction Z of the electrode lead-out hole 211, the first insulating member 60 is used to at least separate the second flange 33 from the fixing member 40. The second insulating member 70 is used to at least separate the first flange 32 from the fixing member 40.

[0256] Referring to Figures 8 to 11 , another embodiment of the present application provides a battery cell 6 , which includes a housing 20 , an electrode assembly 10 , an electrode terminal 30 , a fixing member 40 , a sealing member 50 , a first insulating member 60 , and a second insulating member 70 . The housing 20 includes a shell 20 a and an end cap 20 b . The shell 20 a has an opening, and the end cap 20 b is used to cover the opening. The end cap 20 b is provided with an electrode lead-out hole 211 .

[0257] The electrode terminal 30 is electrically connected to the electrode assembly 10 and covers at least a portion of the electrode lead-out hole 211. The fixing member 40 is disposed around the electrode terminal 30 and is used to connect the electrode terminal 30 and the end cap 20b.

[0258] The end cap 20b has a first surface 212 facing the electrode assembly 10 and a second surface 213 facing away from the electrode assembly 10. The electrode terminal 30 does not extend beyond the first surface 212 in the direction facing the electrode assembly 10.

[0259] The electrode terminal 30 includes a terminal body 31, a first flange 32, and a second flange 33. The first flange 32 and the second flange 33 both protrude from the outer peripheral surface 311 of the terminal body. In the axial direction Z of the electrode lead-out hole 211, at least a portion of the fixing member 40 is located between the first flange 32 and the second flange 33. The first insulating member 60 is used to separate at least the second flange 33 from the fixing member 40.

[0260] The sealing member 50 surrounds the terminal body 31 . In the axial direction Z of the electrode lead-out hole 211 , at least a portion of the sealing member 50 is sandwiched between the first flange 32 and the fixing member 40 .

[0261] In the axial direction Z of the electrode lead-out hole 211 , the projection of the first flange 32 at least partially overlaps with the projection of the first wall 21 . The second insulating member 70 is at least used to separate the first flange 32 from the first wall 21 .

[0262] The electrode terminal 30 has an end surface 30a facing the electrode assembly 10 and is provided with a second recessed portion 34 that is recessed relative to and surrounds the end surface 30a. The second recessed portion 34 extends radially of the electrode terminal 30 to the outer peripheral surface 322 of the first flange. The portion of the second insulating member 70 received in the second recessed portion 34 separates the first flange 32 from the first wall 21.

[0263] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0264] 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 of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cell, comprising: The housing comprises a first wall, wherein the first wall is provided with an electrode lead-out hole; an electrode assembly, contained in the housing; an electrode terminal electrically connected to the electrode assembly and covering at least a portion of the electrode lead-out hole; A fixing member, disposed around the electrode terminal and used to connect the electrode terminal and the first wall; The sealing member surrounds the electrode terminal, and at least a portion of the sealing member is sandwiched between the electrode terminal and the fixing member.

2. The battery cell according to claim 1, wherein, The electrode terminal comprises a terminal body and a first flange protruding from an outer peripheral surface of the terminal body, and the sealing member surrounds the terminal body; In the axial direction of the electrode lead-out hole, at least a portion of the sealing member is sandwiched between the first flange and the fixing member.

3. The battery cell according to claim 2, wherein, The electrode terminal further includes a second flange, the second flange protruding from the outer peripheral surface of the terminal body; The first flange and the second flange are spaced apart in the axial direction, and at least a portion of the fixing member is located between the first flange and the second flange.

4. The battery cell according to claim 3, wherein, In the axial direction of the electrode lead-out hole, the second flange is located on a side of the first flange that is away from the electrode assembly. 5 . The battery cell according to claim 3 , further comprising a first insulating member; in the axial direction of the electrode lead-out hole, at least a portion of the first insulating member is located between the second flange and the fixing member.

6. The battery cell according to any one of claims 2-5, wherein, The sealing member comprises a sealing body and a first protrusion, wherein the sealing body surrounds the terminal body, and the first protrusion protrudes from a surface of the sealing body facing the first flange; In the axial direction of the electrode lead-out hole, at least a portion of the sealing body is sandwiched between the first flange and the fixing member; At least a portion of the first flange is located between the first protrusion and the terminal body.

7. The battery cell according to claim 6, wherein, The first flange is provided with a first recessed portion, the first recessed portion being recessed relative to a surface of the first flange facing the sealing body; The first protrusion is received in the first recess.

8. The battery cell according to any one of claims 2-7, wherein, The sealing member comprises a sealing body and a second protrusion, wherein the sealing body surrounds the terminal body, and the second protrusion protrudes from a surface of the sealing body away from the first flange; In the axial direction of the electrode lead-out hole, at least a portion of the sealing body is sandwiched between the first flange and the fixing member; The second protrusion is arranged between the fixing member and the terminal body.

9. The battery cell according to any one of claims 2-8, wherein, In the axial direction of the electrode lead-out hole, the projection of the first flange is located within the projection of the electrode lead-out hole.

10. The battery cell according to any one of claims 2-8, wherein, In the axial direction of the electrode lead-out hole, the projection of the first flange at least partially overlaps with the projection of the first wall; The battery cell further includes a second insulating member, the second insulating member being used to at least separate the first flange from the first wall.

11. The battery cell according to any one of claims 2-10, wherein, The battery cell further includes a second insulating member, and the second insulating member is at least used to separate the first flange from the fixing member.

12. The battery cell according to claim 11, wherein, In the axial direction of the electrode lead-out hole, at least a portion of the second insulating member is disposed between the fixing member and the first flange.

13. The battery cell according to claim 11 or 12, wherein, The electrode terminal has an end surface facing the electrode assembly, and the electrode terminal is provided with a second recessed portion that is recessed relative to the end surface and surrounds the end surface; The second recess extends radially of the electrode terminal to the outer peripheral surface of the first flange; The portion of the second insulating member received in the second recess separates the first flange and the first wall.

14. The battery cell according to claim 13, wherein, The inner diameter of the second recess is smaller than the inner diameter of the electrode lead-out hole.

15. The battery cell according to any one of claims 1-14, wherein, The first wall has a first surface facing the electrode assembly and a second surface facing away from the electrode assembly; In the direction facing the electrode assembly, the electrode terminal does not extend beyond the first surface.

16. The battery cell according to any one of claims 1-15, wherein, The first wall and the fixing member are separately provided.

17. The battery cell according to claim 16, wherein, The first wall has a first surface facing the electrode assembly and a second surface facing away from the electrode assembly; The first wall is provided with a third recess recessed with respect to the second surface, and the electrode lead-out hole is provided on the bottom surface of the third recess; At least a part of the fixing member is received in the third recess.

18. The battery cell according to claim 17, wherein, The fixing member has a connecting surface, and the connecting surface abuts against the bottom surface of the third recess in the axial direction of the electrode lead-out hole; The connecting surface is flush with the end surface of the electrode terminal facing the electrode assembly.

19. The battery cell according to any one of claims 1-18, wherein, The fixing member is provided on a side of the first wall facing away from the electrode assembly.

20. The battery cell according to claim 19, wherein, The fixing member includes a first connecting portion, a second connecting portion and a bending portion; at least a part of the electrode terminal is located on a side of the first connecting portion facing the electrode assembly and clamps the sealing member with the first connecting portion; The bending portion surrounds the outer periphery of the first connecting portion and bends towards the first wall; the second connecting portion surrounds the bending portion and is connected to the first wall.

21. The battery cell according to any one of claims 1-15, wherein, The fixing member and the first wall are integrally formed.

22. The battery cell according to any one of claims 1-21, wherein, The outer casing includes a housing and an end cap, the housing has an opening, and the end cap is used to cover the opening; The end cap is the first wall.

23. The battery cell according to any one of claims 1-22, wherein, In a plane parallel to the axial direction of the electrode lead-out hole, the orthographic projection of the electrode terminal covers the orthographic projection of the sealing member.

24. A battery, comprising a plurality of battery cells according to any one of claims 1-23.

25. An electrical device, comprising a battery cell according to any one of claims 1-23, the battery cell being used to provide electrical energy.

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