Battery cells, batteries and power consuming devices

Abstract

The embodiments of the present application provide a battery cell, a battery, and a power consuming device. The battery cell includes 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. The electrode assembly is accommodated 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 to surround the electrode terminal and connects the electrode terminal to the first wall. The sealing member surrounds the electrode terminal, and at least a portion of the sealing member is interposed between the electrode terminal and the fixing member.

Description

[Technical Field]

[0001] This application relates to the technical field of batteries, and more particularly to battery cells, batteries and power consuming devices. [Background technology]

[0002] Battery cells are widely used in electronic devices such as mobile phones, laptops, electric cars, electric planes, electric boats, electric toy cars, electric toy boats, electric toy planes, and power tools.

[0003] In the development of battery technology, how to improve the reliability of battery cells is one of the research directions in battery technology. Summary of the Invention

[0004] The present application provides a battery cell, a battery, and a power consuming device that can improve reliability.

[0005] According to a first aspect, an embodiment of the present application provides a battery cell including 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. The electrode assembly is accommodated 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 to surround the electrode terminal and connects the electrode terminal to the first wall. The sealing member surrounds the electrode terminal, and at least a portion of the sealing member is interposed between the electrode terminal and the fixing member.

[0006] By providing a fixing member to connect the electrode terminal and the first wall and interposing at least a portion of the sealing member between the electrode terminal and the fixing member, sealing is achieved, the force acting on the first wall is reduced, deformation of the housing is reduced, and the reliability of the battery cell is improved.

[0007] In some embodiments, the electrode terminal includes 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, and at least a portion of the sealing member is interposed between the first flange and the fixing member in the axial direction of the electrode extraction hole.

[0008] By providing the first flange, the electrode terminal and the fixing member overlap in the axial direction of the electrode lead-out hole, and further, the first flange and the fixing member can sandwich the sealing member in the axial direction of the electrode lead-out hole. A method in which the first flange and the fixing member sandwich the sealing member in the axial direction of the electrode lead-out hole is easy to realize and easy to assemble.

[0009] In some embodiments, the electrode terminal further includes a second flange protruding from an outer circumferential surface of the terminal body, the first flange and the second flange being spaced apart in the axial direction, and at least a portion of the fixing member being located between the first flange and the second flange.

[0010] The first and second flanges can position the fixing member from both sides to connect the fixing member to the electrode terminal. When the first flange and the fixing member compress the sealing member in the axial direction, the reaction force applied by the sealing member to the fixing member is transmitted to the second flange generally in the axial direction, and the reaction force from the sealing member is transmitted generally to the first and second flanges, thereby reducing the force applied to the first wall, reducing deformation of the housing, and improving the reliability of the battery cell.

[0011] In some embodiments, the second flange is located on a side of the first flange that is away from the electrode assembly in the axial direction of the electrode extraction hole.

[0012] By positioning the portion of the sealing member sandwiched between the first flange and the fixing member inside the second flange, the risk of the sealing member being exposed can be reduced, and deterioration of the sealing member can be reduced.

[0013] In some embodiments, the battery cell further includes a first insulating member, at least a portion of which is located between the second flange and the fixing member in the axial direction of the electrode extraction hole.

[0014] The first insulating member insulates and separates the second flange and the fixing member, thereby reducing the risk of electrical conduction between the electrode terminal and the fixing member.

[0015] In some embodiments, the sealing member includes a sealing body and a first protrusion, the sealing body surrounding the terminal body, and the first protrusion protruding from a surface of the sealing body facing the first flange. At least a portion of the sealing body is interposed between the first flange and the fixing member in the axial direction of the electrode extraction hole. At least a portion of the first flange is located between the first protrusion and the terminal body.

[0016] The portion of the sealing body sandwiched between the first flange and the fixing member can be compressed under force to achieve a seal between the electrode terminal and the fixing member. When assembling the electrode terminal and the sealing member, the first protrusion engages with the first flange to achieve radial positioning of the electrode terminal on the sealing member, thereby improving assembly efficiency and accuracy.

[0017] In some embodiments, the first flange is provided with a first recess recessed relative to a surface of the first flange facing the sealing body, and the first protrusion is received in the first recess.

[0018] The first recess provides an escape space for the first protrusion, thereby reducing the risk of interference between the first protrusion and the first flange. Furthermore, by providing the first recess, the first flange and the first protrusion share space in the radial direction of the electrode terminal, thereby improving space utilization.

[0019] In some embodiments, the sealing member includes a sealing body and a second protrusion, the sealing body surrounding the terminal body, and the second protrusion protruding from a surface of the sealing body away from the first flange. At least a portion of the sealing body is interposed between the first flange and the fixing member in the axial direction of the electrode extraction hole. The second protrusion is provided between the fixing member and the terminal body.

[0020] The portion of the sealing body sandwiched between the first flange and the fixing member can be compressed under pressure 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.

[0021] In some embodiments, a projection of the first flange is located within a projection of the electrode lead hole in the axial direction of the electrode lead hole.

[0022] Since the first flange and the first wall do not overlap in the axial direction, the creepage distance between the first flange and the first wall can be increased, the insulation between the first flange and the first wall can be improved, the insulating structure between the first flange and the first wall can be omitted, the overall weight can be reduced, and the energy density can be improved.

[0023] In some embodiments, a projection of the first flange and a projection of the first wall at least partially overlap in the axial direction of the electrode lead-out hole, and the battery cell further includes a second insulating member for separating at least the first flange and the first wall.

[0024] The first wall supports the first flange, thereby increasing the load-bearing capacity of the electrode terminal in the axial direction and making the electrode terminal more stable. The second insulating member separates the first flange from the first wall so as to reduce the risk of electrical conduction between the first flange and the first wall and improve insulation.

[0025] In some embodiments, the battery cell further includes a second insulating member for separating at least the first flange and the fixing member.

[0026] The second insulating member insulates and separates the first flange from the fixing member, thereby reducing the risk of electrical conduction between the electrode terminal and the fixing member.

[0027] In some embodiments, at least a portion of the second insulating member is provided between the fixing member and the first flange in the axial direction of the electrode extraction hole.

[0028] The fixing member and the first flange restrict the second insulating member from both sides, thereby reducing the risk of the second insulating member coming off and improving the insulating performance.

[0029] In some embodiments, the electrode terminal has an end surface facing the electrode assembly, and the electrode terminal is provided with a second recess recessed relative to and surrounding the end surface. The second recess extends radially of the electrode terminal to the outer circumferential surface of the first flange. A portion of the second insulating member accommodated in the second recess separates the first flange from the first wall.

[0030] By providing the second recess, the second insulating member and the electrode terminal share more space in the axial direction, reducing the dimension by which the electrode terminal protrudes from the first wall, improving space utilization. Also, by providing the second recess, the distance between the electrode terminal and the first wall can be increased, reducing the risk of electrical conduction between the electrode terminal and the first wall.

[0031] In some embodiments, the inner diameter of the second recess is smaller than the inner diameter of the electrode lead-out hole.

[0032] In the above technical solution, the small size of the end face of the electrode terminal reduces the risk of the end face and the first wall overlapping in the axial direction, and reduces the risk of electrical conduction between the end face and the first wall.

[0033] In some embodiments, the first wall has a first surface facing the electrode assembly and a second surface facing away from the electrode assembly, and the electrode terminal does not extend beyond the first surface in a direction facing the electrode assembly.

[0034] The above technical solution reduces the dimension in which the electrode terminals penetrate into the housing, reducing the amount of space occupied by the electrode terminals inside the housing, thereby providing more space for the electrolyte and improving the cycle life and cycle performance of the battery cell.

[0035] In some embodiments, the first wall and the securing member are separate bodies.

[0036] By providing the first wall and the fixing member separately, the molding process for the first wall and the fixing member can be simplified, the risk of the first wall interfering with the assembly of the fixing member and the electrode terminal can be reduced, and the difficulty of assembly can be reduced.

[0037] In some embodiments, the first wall has a first surface facing the electrode assembly and a second surface away from the electrode assembly. The first wall has a third recess recessed relative to the second surface, and the electrode extraction hole is provided in a bottom surface of the third recess. At least a portion of the fixing member is accommodated in the third recess.

[0038] The third recess reduces the amount of the fixing member that protrudes outside the first wall, thereby reducing the overall dimensions of the battery cell and improving the energy density of the battery cell. The third recess also positions the fixing member and simplifies the process of connecting the fixing member to the first wall.

[0039] In some embodiments, the fixing member has a connecting surface that abuts against a bottom surface of the third recess in the axial direction of the electrode lead-out hole and is flush with an end surface of the electrode terminal that faces the electrode assembly.

[0040] The connection surface is flush with the end surface of the electrode terminal facing the electrode assembly, which reduces the size of the electrode terminal that enters the electrode lead-out hole and reduces the amount of space the electrode terminal occupies inside the housing.

[0041] In some embodiments, the securing member is provided on a side of the first wall away from the electrode assembly.

[0042] By providing the fixing member on the side of the first wall away from the electrode assembly, the amount of space occupied by the fixing member within the housing can be reduced.

[0043] In some embodiments, the fixing member includes a first connecting portion, a second connecting portion, and a bent portion, and at least a portion of the electrode terminal is located on a side of the first connecting portion facing the electrode assembly and sandwiches the sealing member together with the first connecting portion. The bent portion is bent around the outer periphery of the first connecting portion toward the first wall, and the second connecting portion is bent around the bent portion and connected to the first wall.

[0044] By bending the fixing member, the distance between the electrode assembly and the first connection portion can be increased, making it easy to provide a sealing member and an electrode terminal on the side of the first connection portion facing the electrode assembly, and reducing the occupation of the electrode terminal in the internal space of the housing.

[0045] In some embodiments, the securing member is integrally formed with the first wall.

[0046] By providing the fixing member integrally with the first wall, the connection strength between the first wall and the fixing member is improved, and the step of connecting the first wall and the fixing member can be omitted.

[0047] In some embodiments, the housing includes a housing body having an opening, and an end cap for fitting over and coupling to the opening. The end cap is the first wall.

[0048] The end caps may have a plate-like structure, and members such as electrode terminals and fixing members can be easily attached to the end caps.

[0049] In some embodiments, in a plane parallel to the axial direction of the electrode lead-out hole, an orthogonal projection of the electrode terminal covers an orthogonal projection of the sealing member.

[0050] By having the sealing member and the electrode terminal share a partial space in the axial direction, the dimension by which the electrode terminal protrudes outside the first wall can be reduced, improving space utilization and increasing the energy density of the battery cell.

[0051] According to a second aspect, an embodiment of the present application provides a battery including a plurality of battery cells according to any embodiment of the first aspect.

[0052] According to a third aspect, an embodiment of the present application provides a power consumption device including a battery cell according to any of the embodiments of the first aspect, the battery cell being configured to supply power. [Brief explanation of the drawings]

[0053] In order to more clearly explain the technical solutions of the embodiments of the present application, the drawings that need to be used in the embodiments of the present application will be briefly described below. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on the drawings without any creative work. In the drawings, the drawings are not drawn to actual scale.

[0054] [Figure 1] 1 is a structural schematic diagram of a vehicle according to some embodiments of the present application. [Figure 2] 1 is an exploded schematic view of a battery according to some embodiments of the present application. FIG. [Figure 3] FIG. 1 is an exploded schematic view of a battery cell according to some embodiments of the present application. [Figure 4] 1 is a cross-sectional schematic diagram of a battery cell according to some embodiments of the present application. [Figure 5] FIG. 5 is an enlarged schematic view of the square blank area A in FIG. 4. [Figure 6] FIG. 2 is a cross-sectional schematic view of a terminal assembly of a battery cell according to some embodiments of the present application. [Figure 7] FIG. 7 is an enlarged schematic view of ring B in FIG. 6. [Figure 8] FIG. 2 is a schematic cross-sectional view of a battery cell according to another embodiment of the present application. [Figure 9] FIG. 9 is an enlarged schematic view of the square blank C in FIG. 8. [Figure 10] FIG. 10 is a schematic cross-sectional view of a terminal assembly of a battery cell according to another embodiment of the present application. [Figure 11] FIG. 11 is an enlarged schematic view of the ring D in FIG. [Figure 12] FIG. 10 is a schematic cross-sectional view of a terminal assembly of a battery cell according to yet another embodiment of the present application. [Figure 13] FIG. 10 is a partial cross-sectional schematic view of a battery cell according to still another embodiment of the present application. [Figure 14] FIG. 10 is a partial cross-sectional schematic view of a battery cell according to still another embodiment of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0055] In order to clarify the objectives, technical solutions and advantages of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without any creative work belong to the protection scope of the present application.

[0056] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those skilled in the art to which this application pertains, and the terms used in the specification of this application are merely for the purpose of describing particular embodiments and are not intended to limit this application, and the terms "comprise" and "have" and any variations thereof in the specification and claims of this application and the accompanying drawings are intended to cover a non-exclusive inclusion. Terms such as "first," "second," etc. in the specification and claims of this application or the above drawings are intended to distinguish between different objects and are not intended to describe a particular order or hierarchy.

[0057] In this application, a reference to an "embodiment" means that a particular feature, structure, or characteristic described with reference to the embodiment may be included in at least one embodiment of the application. The appearances of the phrase in various places in this specification do not necessarily all refer to the same embodiment, nor are they mutually exclusive independent or alternative embodiments of other embodiments.

[0058] In the description of this application, unless otherwise clearly specified or limited, the terms "mounted," "coupled," "connected," and "attached" should be understood in a broad sense, and may refer to, for example, a fixed connection, a detachable connection, an integral connection, a direct connection, an indirect connection via an intermediate medium, or internal communication between two elements. Those skilled in the art can understand the specific meanings of the above terms in this application according to specific circumstances.

[0059] The term "and / or" in this application is merely a relational relationship that describes related objects, and indicates that three relationships may exist, for example, A and / or B may indicate three situations: A exists alone, A and B exist simultaneously, and B exists alone. Also, the character " / " in this application generally indicates that the related objects before and after it are in an "or" relationship.

[0060] In the embodiments of the present application, the same reference numerals denote the same elements, and for the sake of brevity, detailed descriptions of the same elements in different embodiments will be omitted. Furthermore, the dimensions such as thickness, length, and width of various elements in the embodiments of the present application and the overall dimensions such as thickness, length, and width of the integrated device shown in the drawings are merely illustrative and do not limit the present application in any way.

[0061] As used in this application, "plurality" refers to two or more (including two).

[0062] In the present application, the battery cells may include, but are not limited to, 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. The battery cells may be cylindrical, flat, rectangular, or have other shapes, but are not limited to these.

[0063] The battery according to the embodiment 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, parallel, or series-parallel by bus bars.

[0064] In some embodiments, the battery may be a battery module, and if there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0065] In some embodiments, the battery may be a battery pack, which includes a housing and battery cells, and the battery cells or modules are housed in the housing.

[0066] In some embodiments, the housing may be part of a chassis structure of a vehicle, for example, a portion of the housing may be at least a portion of a floor of the vehicle, or a portion of the housing may be at least a portion of a cross member and a side member of the vehicle.

[0067] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, or the like.

[0068] A battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (e.g., lithium ions) are inserted and removed between the positive electrode and the negative electrode. The separator, located between the positive electrode and the negative electrode, prevents short-circuiting between the positive and negative electrodes and allows the active ions to pass through.

[0069] 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.

[0070] As an example, the positive electrode current collector has two surfaces that face each other in the thickness direction thereof, and the positive electrode active material is provided on one or both of the two facing surfaces of the positive electrode current collector.

[0071] As an example, the positive electrode current collector may be a metal foil piece or a composite current collector. For example, the metal foil piece may be aluminum or stainless steel with a silver surface treatment, copper, aluminum, nickel, a carbon electrode, carbon, titanium, or the like. The composite current collector may include a base layer of a polymer material 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, silver alloy, or the like) on a polymer material substrate (e.g., a substrate such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, or polyethylene).

[0072] As an example, the positive electrode active material may include at least one of a lithium-containing phosphate, a lithium transition metal oxide, and a modified compound thereof. The present application is not limited to these materials, and other conventional materials usable as positive electrode active materials in batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more.

[0073] In some embodiments, the positive 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 positive electrode, a positive electrode active material may or may not be provided on the surface of the metal foam. For example, a lithium source material, such as potassium metal or sodium metal, may be filled and / or deposited in the metal foam, and the lithium source material may be lithium metal and / or a lithium-rich material.

[0074] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0075] As an example, the negative electrode current collector may be a metal foil piece or a composite current collector. For example, the metal foil piece may be aluminum or stainless steel with a silver surface treatment, copper, aluminum, nickel, a carbon electrode, carbon, titanium, or the like. The composite current collector may include a base layer of a polymer material 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, silver alloy, or the like) on a polymer material substrate (e.g., a substrate such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, or polyethylene).

[0076] As an example, the negative electrode sheet can include a negative electrode current collector and a negative electrode active material provided on at least one surface of the negative electrode current collector.

[0077] As an example, the negative electrode current collector has two surfaces that face each other in the thickness direction thereof, and the negative electrode active material is provided on one or both of the two facing surfaces of the negative electrode current collector.

[0078] For example, the negative electrode active material may be any negative electrode active material known in the art for battery cells, including at least one of artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate.

[0079] In some embodiments, the negative electrode can be a metal foam. The metal foam can be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam. When the metal foam is used as the negative electrode sheet, the negative electrode active material can be either not provided on the surface of the metal foam or can be provided on the surface of the metal foam.

[0080] As an example, a lithium source material, potassium metal or sodium metal may be loaded or / and deposited in the negative electrode current collector, where the lithium source material is lithium metal and / or a lithium-rich material.

[0081] 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.

[0082] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0083] In some embodiments, the separator is a separation membrane. In the present application, the type of separation membrane is not particularly limited, and any known porous structure separation membrane having good chemical stability and mechanical stability can be selected.

[0084] For example, the main material of the separation membrane may be at least one selected from glass fiber, nonwoven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic.

[0085] In some embodiments, the separator is a solid electrolyte that is disposed between the positive and negative electrodes and serves to transport ions and separate the positive and negative electrodes.

[0086] In some embodiments, the battery cell further includes an electrolyte that serves to conduct ions between the positive electrode and the negative electrode. The present application does not specifically limit the type of electrolyte, and the electrolyte may be selected as needed. The electrolyte may be in a liquid, gel, or solid state.

[0087] In some embodiments, the electrode assembly is a wound structure, with the positive electrode sheet and the negative electrode sheet wound into the wound structure.

[0088] In some embodiments, the electrode assembly is a laminate structure.

[0089] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets are provided, and the plurality of positive electrode sheets and the plurality of negative electrode sheets are provided in an alternating stack.

[0090] As an example, multiple positive electrode sheets may be provided, and the negative electrode sheet may be folded to form multiple folded sections that are stacked, with one positive electrode sheet sandwiched between adjacent folded sections.

[0091] In one example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded segments that are stacked and arranged.

[0092] For example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0093] As an example, the separator may be continuously disposed, and may be disposed between any adjacent positive or negative electrode sheets in a folded or wound manner.

[0094] In some embodiments, the electrode assembly may have a cylindrical, flattened, or polygonal prism shape, or the like.

[0095] In some embodiments, the electrode assembly is provided with tabs that can conduct electrical current from the electrode assembly. The tabs include a positive electrode tab and a negative electrode tab.

[0096] The battery cell further includes a housing having a cavity formed therein for accommodating the electrode assembly. The housing may protect the electrode assembly from the outside so that external foreign objects do not affect the charging and discharging of the electrode assembly.

[0097] The battery cell further includes electrode terminals attached to the housing, the electrode terminals being electrically connected to the electrode assembly, and the electrode terminals are used to electrically connect the electrode assembly to an external circuit so as to charge and discharge the battery cell.

[0098] In the prior art, the housing typically has an electrode lead-out hole, and the electrode terminal covers at least a portion of the electrode lead-out hole, thereby establishing an electrical connection between the electrode terminal and the electrode assembly housed inside the housing.

[0099] To improve the reliability of the battery cell, a seal member is usually provided to seal the electrode lead-out hole, thereby reducing the risk of electrolyte leakage. In conventional technology, the seal member is usually sandwiched between the electrode terminal and the housing, and the electrode terminal and the housing press against the seal member to seal the electrode lead-out hole.

[0100] However, the housing usually needs to press directly against the sealing member, which increases the reaction force that the sealing member exerts on the housing. As the battery cells are used repeatedly, the housing is prone to deformation, which affects the reliability of the battery cells.

[0101] In view of these points, the embodiments of the present application provide a technical solution that connects the electrode terminal and the housing by providing a fixing member and interposing at least a portion of the sealing member between the electrode terminal and the fixing member, thereby reducing the force applied to the housing, reducing deformation of the housing, and improving the reliability of the battery cell.

[0102] The technical solutions described in the embodiments of the present application are applicable to batteries and power-consuming devices that use batteries.

[0103] The power consuming devices may be vehicles, mobile phones, portable devices, laptops, boats, spacecraft, electric toys, power tools, etc. The vehicles may be engine-driven vehicles, natural gas vehicles, or new energy vehicles. The new energy vehicles may be pure electric vehicles, hybrid vehicles, or range-extended vehicles, etc. The spacecraft include airplanes, rockets, space shuttles, and spaceships, etc. The power toys include stationary or mobile power toys, such as game consoles, electric car toys, electric boat toys, and electric plane toys, etc. The power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, hammer drills, concrete vibrators, and electric planers, etc. In the embodiments of the present application, there are no particular limitations on the power consuming devices.

[0104] In the following embodiments, for convenience of explanation, the power consuming device will be described as a vehicle.

[0105] FIG. 1 is a structural schematic diagram of a vehicle according to some embodiments of the present application.

[0106] 1, a battery 2 is provided inside the vehicle 1, and the battery 2 may be provided at the bottom, head, or tail of the vehicle 1. The battery 2 may be used to supply power to the vehicle 1, and may be used, for example, as an operating power source for the vehicle 1.

[0107] The vehicle 1 may further include a controller 3 and a motor 4, where the controller 3 is configured to control the battery 2 to supply power to the motor 4, for example for starting, navigation and operating power needs of the vehicle 1 when driving.

[0108] In some embodiments of the present application, the battery 2 may be the driving power source for the vehicle 1 as well as the operating power source for the vehicle 1, providing the driving power for the vehicle 1 in place of or in part from fuel or natural gas.

[0109] FIG. 2 is an exploded schematic view of a battery according to some embodiments of the present application.

[0110] As shown in FIG. 2, the battery 2 includes a housing 5 and a battery cell 6 (not shown), and the battery cell 6 is housed in the housing 5.

[0111] The housing 5 is used to house the battery cells 6 and may have various structures. In some embodiments, the housing 5 may include a first housing portion 5a and a second housing portion 5b, which are fitted over and coupled to each other, and which together define a housing space 5c for housing the battery cells 6. The second housing portion 5b may have a hollow structure with one end open, or the first housing portion 5a may have a plate-like structure, and the first housing portion 5a is fitted over and coupled to the open side of the second housing portion 5b to form the housing 5 having the housing space 5c. Alternatively, both the first housing portion 5a and the second housing portion 5b may have a hollow structure with one end open, and the open side of the first housing portion 5a is fitted over and coupled to the open side of the second housing portion 5b to form the housing 5 having the housing space 5c. Of course, the first housing portion 5a and the second housing portion 5b may have various shapes such as a cylindrical body or a rectangular parallelepiped.

[0112] In order to improve the sealing performance after the first housing part 5a and the second housing part 5b are connected, a sealing material, such as a sealant or a seal ring, may be provided between the first housing part 5a and the second housing part 5b.

[0113] If the first housing part 5a is placed on top of the second housing part 5b and coupled to it, the first housing part 5a is also called an upper housing cover, and the second housing part 5b is also called a lower housing.

[0114] The battery 2 may have one or more battery cells 6. When there are multiple battery cells 6, the multiple battery cells 6 can be connected in series, parallel, or a mixed connection, and a mixed connection means that the multiple battery cells 6 are connected in both series and parallel. The multiple battery cells 6 may be directly connected in series, parallel, or a mixed connection, and then the entire multiple battery cells 6 may be housed in the casing 5. Of course, the multiple battery cells 6 may first be connected in series, parallel, or a mixed connection to form a battery module, and then the multiple battery modules may be further connected in series, parallel, or a mixed connection to form a whole and housed in the casing 5.

[0115] FIG. 3 is an exploded schematic view of a battery cell according to some embodiments of the present application, FIG. 4 is a cross-sectional schematic view of a battery cell according to some embodiments of the present application, FIG. 5 is an enlarged schematic view of the square blank A in FIG. 4, FIG. 6 is a cross-sectional schematic view of a terminal assembly of a battery cell according to some embodiments of the present application, and FIG. 7 is an enlarged schematic view of the circle B in FIG. 6.

[0116] 3 to 7 , an embodiment of the present application provides a battery cell 6 including 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 having an electrode lead-out hole 211 formed therein. 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 to surround the electrode terminal 30 and connects the electrode terminal 30 to the first wall 21. The sealing member 50 surrounds the electrode terminal 30 and is at least partially interposed between the electrode terminal 30 and the fixing member 40.

[0117] The housing 20 has a hollow structure that forms an internal storage space for storing the electrode assembly 10 and the electrolyte. The shape of the housing 20 can be determined depending on the specific shape of the electrode assembly 10. For example, if the electrode assembly 10 has a rectangular parallelepiped structure, a rectangular parallelepiped housing can be selected, and if the electrode assembly 10 has a cylindrical structure, a cylindrical housing can be selected.

[0118] The housing 20 may be made of a variety of materials, for example, metal or plastic. Preferably, the housing 20 may be made of copper, iron, aluminum, steel, aluminum alloy, etc.

[0119] The first wall 21 is a wall of the housing 20 having a certain thickness, and may be the top wall of the housing 20, the bottom wall of the housing 20, or a side wall of the housing 20, although the embodiments of the present application are not limited thereto.

[0120] The electrode lead-out hole 211 penetrates the first wall 21 to communicate the interior and exterior spaces of the housing 20, thereby facilitating the extraction of electrical energy generated by the electrode assembly 10 to the outside of the housing 20. Preferably, the electrode lead-out hole 211 penetrates the first wall 21 along the thickness direction of the first wall 21.

[0121] 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 FIG. 3, there are two electrode assemblies 10.

[0122] The electrode terminals 30 electrically connect the electrode assembly 10 to a circuit external to the battery cell 6 to realize charging and discharging.

[0123] The number of electrode terminals 30 may be one or more. In some examples, there is one electrode terminal 30, and one of the electrode terminal 30 and the housing 20 is electrically connected to the positive electrode sheet and the other is electrically connected to the negative electrode sheet, and the electrode terminal 30 and the housing 20 become two output electrodes of the battery cell 6. In other examples, there are two electrode terminals 30, and one electrode terminal 30 is electrically connected to the positive electrode sheet and the other electrode terminal 30 is electrically connected to the negative electrode sheet.

[0124] In the axial direction Z of the electrode lead hole 211, the projection of the electrode terminal 30 and the projection of the electrode lead hole 211 at least partially overlap. In some examples, in the axial direction Z of the electrode lead hole 211, the projection of the electrode terminal 30 is located within the projection of the electrode lead hole 211, and in other examples, in the axial direction Z of the electrode lead hole 211, part of the projection of the electrode terminal 30 is located within the projection of the electrode lead hole 211 and another part is located outside the projection of the electrode lead hole 211.

[0125] In some examples, the entire electrode terminal 30 is located outside the first wall 21 and covers at least a portion of the electrode extraction hole 211 from the outside, in other examples, the entire electrode terminal 30 is located inside the first wall 21 and covers at least a portion of the electrode extraction hole 211 from the inside, and in other examples, a portion of the electrode terminal 30 is located outside the first wall 21 and a portion is housed within the electrode extraction hole 211.

[0126] The fixing member 40 has an annular structure and forms a surrounding accommodation space, and at least a portion of the electrode terminal 30 is accommodated in the accommodation space of the fixing member 40.

[0127] The embodiments of the present application do not limit the connection method between the fixing member 40 and the electrode terminal 30. For example, the fixing member 40 may be directly connected to the electrode terminal 30, or may be indirectly connected to the electrode terminal 30 via another member.

[0128] The embodiments of the present application do not limit the manner in which the fixing member 40 and the first wall 21 are connected to each other. In some examples, the fixing member 40 is integrally formed with the first wall 21, and in other examples, the fixing member 40 and the first wall 21 may be formed independently of each other, and the two may be connected to each other by adhesion, fastening, welding, or other methods.

[0129] The portion of the sealing member 50 interposed between the electrode terminal 30 and the fixing member 40 may seal the gap between the electrode terminal 30 and the fixing member 40. For example, the sealing member 50, the electrode terminal 30, and the fixing member 40 together seal the electrode lead-out hole 211.

[0130] The sealing member 50 may have an annular structure. For example, the sealing member 50 may be interposed between the electrode terminal 30 and the fixing member 40 in the radial direction of the electrode terminal 30, or may be interposed between the electrode terminal 30 and the fixing member 40 in the axial direction Z of the electrode terminal 30.

[0131] In the 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 interposed between the electrode terminal 30 and the fixing member 40, thereby realizing sealing, reducing the acting force on the first wall 21, reducing deformation of the housing 20, and improving the reliability of the battery cell 6.

[0132] In some embodiments, the housing 20 includes a housing body 20a having an opening and an end cap 20b for covering the opening.

[0133] The housing body 20a is a member that cooperates with the end cap 20b to form an internal cavity of the battery cell 6, and the formed internal cavity may be used to accommodate the electrode assembly 10, electrolyte, and other components.

[0134] The housing body 20a and the end cap 20b may be separate bodies. For example, an opening may be provided in the housing body 20a, and the end cap 20b may be placed over the opening to form an internal cavity for the battery cell 6.

[0135] The housing body 20a may have various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism shape, etc. Specifically, the shape of the housing body 20a may be determined depending on the specific shape and size of the electrode assembly 10. The housing body 20a may be made of a variety of materials, such as copper, iron, aluminum, stainless steel, and aluminum alloy, but the embodiments of the present application are not particularly limited thereto.

[0136] The shape of the end caps 20b may be adapted to fit the shape of the housing body 20a and engage with the housing body 20a. Preferably, the end caps 20b may be made of a material (e.g., aluminum alloy) having a certain hardness and strength, so that the end caps 20b are less likely to deform when pressed against a collision, and the battery cells 6 may have higher structural strength and improved reliability.

[0137] The end cap 20b is connected to the housing body 20a by welding, adhesive, fastening or other methods.

[0138] In some examples, the housing body 20a may have a structure that is open on one side, and one end cap 20b is provided to cover the housing body 20a. In other examples, the housing body 20a may have a structure that is open on both sides, and two end caps 20b are provided, and the two end caps 20b each cover two openings of the housing body 20a.

[0139] In some examples, end cap 20b may be first wall 21, and in other examples, one wall of housing body 20a may be end cap 20b, for example, the bottom wall of housing body 20a opposite end cap 20b may be first wall 21.

[0140] In some embodiments, the end cap 20b is the first wall 21. The end cap 20b may have a plate-like structure, and components such as the electrode terminal 30 and the fixing member 40 can be easily attached to the end cap 20b.

[0141] In some embodiments, in a plane parallel to the axial direction Z of the electrode lead-out hole 211 , the orthogonal projection of the electrode terminal 30 covers the orthogonal projection of the sealing member 50 .

[0142] In the axial direction Z, the sealing member 50 and the electrode terminal 30 share a portion of the space, thereby reducing the dimension by which the electrode terminal 30 protrudes outside the first wall 21, improving space utilization and increasing the energy density of the battery cell 6.

[0143] 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, and the sealing member 50 surrounds the terminal body 31. In the axial direction Z of the electrode extraction hole 211, at least a portion of the sealing member 50 is interposed between the first flange 32 and the fixing member 40.

[0144] There may be one or more first flanges 32. In some examples, there is one first flange 32, and the first flange 32 goes around the terminal body 31 once. In other examples, there are multiple first flanges 32, and the multiple first flanges 32 are provided at intervals along the circumferential direction of the terminal body 31.

[0145] In some examples, in the axial direction Z of the electrode extraction hole 211, the projection of the first flange 32 is located within the projection of the electrode extraction hole 211, and in other examples, in the axial direction Z of the electrode extraction hole 211, part of the projection of the first flange 32 is located within the projection of the electrode extraction hole 211, and another part is located outside the projection of the electrode extraction hole 211.

[0146] The first flange 32 may be located inside the electrode lead-out hole 211 or outside the electrode lead-out hole 211. Of course, the first flange 32 may alternatively be housed within the electrode lead-out hole 211.

[0147] In the axial direction Z of the electrode extraction hole 211, only a portion of the sealing member 50 may be interposed between the first flange 32 and the fixing member 40, or the entire sealing member 50 may be interposed between the first flange 32 and the fixing member 40.

[0148] By providing the first flange 32, the electrode terminal 30 and the fixing member 40 can be made to overlap in the axial direction Z of the electrode pull-out hole 211, and the first flange 32 and the fixing member 40 can sandwich the sealing member 50 in the axial direction Z of the electrode pull-out hole 211. The method in which the first flange 32 and the fixing member 40 sandwich the sealing member 50 in the axial direction Z of the electrode pull-out hole 211 is easy to realize and easy to assemble.

[0149] In some embodiments, the electrode terminal 30 further includes a second flange 33 protruding 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.

[0150] In some examples, the first flange 32 may be located on the side of the second flange 33 closer to the electrode assembly 10, and in other examples, the first flange 32 may be located on the side of the second flange 33 away from the electrode assembly 10.

[0151] There may be one or more second flanges 33. In some examples, there is one second flange 33, and the second flange 33 goes around the terminal body 31 once. In other examples, there are multiple second flanges 33, and the multiple second flanges 33 are provided at intervals along the circumferential direction of the terminal body 31.

[0152] The first flange 32 and the second flange 33 restrict the position of the fixing member 40 from both sides of the fixing member 40, thereby enabling connection between the fixing member 40 and the electrode terminal 30. When the first flange 32 and the fixing member 40 compress the sealing member along the axial direction Z, the reaction force applied by the sealing member to the fixing member 40 is transmitted to the second flange 33 generally along the axial direction Z. In other words, the reaction force of the sealing member is transmitted generally to the first flange 32 and the second flange 33, thereby reducing the force applied to the first wall 21, reducing deformation of the housing 20, and improving the reliability of the battery cell 6.

[0153] In some embodiments, the second flange 33 is located on the side of the first flange 32 that is away from the electrode assembly 10 in the axial direction Z of the electrode extraction hole 211 .

[0154] The portion of the sealing member 50 sandwiched between the first flange 32 and the fixing member 40 is located inside the second flange 33, thereby reducing the risk of exposure of the sealing member 50 and reducing deterioration of the sealing member 50.

[0155] In some embodiments, the battery cell 6 further includes a first insulating member 60. In the axial direction Z of the electrode extraction hole 211, at least a portion of the first insulating member 60 is located between the second flange 33 and the fixing member 40.

[0156] The first insulating member 60 insulates and separates the second flange 33 and the fixing member 40, thereby reducing the risk of electrical conduction between the electrode terminal 30 and the fixing member 40.

[0157] In some embodiments, the sealing member 50 includes a sealing body 51 that surrounds the terminal body 31, and a first protrusion 52 that protrudes from a surface of the sealing body 51 that faces the first flange 32. In the axial direction Z of the electrode extraction hole 211, at least a portion of the sealing body 51 is interposed 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.

[0158] There may be one or more first protrusions 52. In some examples, there is one first protrusion 52, and the one first protrusion 52 is provided surrounding the first flange 32, while in other examples, there are multiple first protrusions 52, and the multiple first protrusions 52 are provided at intervals along the circumferential direction of the terminal body 31.

[0159] For example, at least a portion of the first flange 32 is located between the first projection 52 and the terminal body 31 in the radial direction of the electrode terminal 30 .

[0160] The sealing body 51 can be compressed by a force at the portion sandwiched between the first flange 32 and the fixing member 40 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 protrusions 52 engage with the first flange 32, thereby achieving radial positioning of the electrode terminal 30 in the sealing member 50 and improving assembly efficiency and accuracy.

[0161] 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.

[0162] The first recess 321 provides an escape space for the first protrusion 52, thereby reducing the risk of interference between the first protrusion 52 and the first flange 32. Furthermore, by providing the first recess 321, the first flange 32 and the first protrusion 52 can share space in the radial direction of the electrode terminal 30, thereby improving space utilization.

[0163] In some embodiments, the projection of the first flange 32 is located within the projection of the electrode lead-out hole 211 in the axial direction Z of the electrode lead-out hole 211 .

[0164] Since the first flange 32 and the first wall 21 do not overlap in the axial direction Z, the creepage distance between the first flange 32 and the first wall 21 can be increased, the insulation between the first flange 32 and the first wall 21 can be improved, the insulating structure between the first flange 32 and the first wall 21 can be omitted, the overall weight can be reduced, and the energy density can be improved.

[0165] For example, in the present application, when the size of the electrode terminal 30 is constant, by increasing the diameter of the electrode lead-out hole 211, the projection of the first flange 32 along the axial direction Z can be positioned within the projection of the electrode lead-out hole 211 along the axial direction Z. By increasing the diameter of the electrode lead-out hole 211, the weight of the entire housing 20 can be reduced.

[0166] In some embodiments, the projection of the electrode terminal 30 is located within the projection of the electrode lead-out hole 211 in the axial direction Z of the electrode lead-out hole 211 .

[0167] In some embodiments, the battery cell 6 further includes a second insulating member 70 for separating at least the first flange 32 and the fixing member 40 .

[0168] For example, the fixing member 40 can be made of a metal material having high strength.

[0169] The second insulating member 70 insulates and separates the first flange 32 and the fixing member 40, thereby reducing the risk of electrical conduction between the electrode terminal 30 and the fixing member 40.

[0170] In some embodiments, at least a portion of the second insulating member 70 is provided between the fixing member 40 and the first flange 32 in the axial direction Z of the electrode extraction hole 211 .

[0171] The fixing member 40 and the first flange 32 restrict the second insulating member 70 from both sides, thereby reducing the risk of the second insulating member 70 coming off and improving the insulating performance.

[0172] In some embodiments, at least a portion of the second insulating member 70 is provided between the fixing member 40 and the bottom surface of the first recess 321 in the axial direction Z of the electrode extraction hole 211 .

[0173] 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 the direction facing the electrode assembly 10.

[0174] In the present application, the size of the electrode terminal 30 that penetrates into the housing 20 is reduced, reducing the amount of space occupied by the electrode terminal 30 inside the housing 20, thereby securing more space for the electrolyte and improving the cycle life and cycle performance of the battery cell 6.

[0175] In some embodiments, both the first surface 212 and the second surface 213 are planar. Preferably, the first surface 212 is parallel to the second surface 213.

[0176] In some embodiments, the battery cell 6 further includes an insulating plastic 80 attached to the first surface 212 .

[0177] In some embodiments, the first wall 21 and the fixing member 40 are provided separately.

[0178] The first wall 21 and the fixing member 40 may be connected by welding, adhesive, caulking, or other methods.

[0179] By providing the first wall 21 and the fixing member 40 as separate bodies, the molding process for the first wall 21 and the fixing member 40 can be simplified, the risk of the first wall 21 interfering with the assembly of the fixing member 40 and the electrode terminal 30 can be reduced, and the difficulty of assembly can be reduced.

[0180] In some embodiments, the first wall 21 has a first surface 212 facing the electrode assembly 10 and a second surface 213 away from the electrode assembly 10. The first wall 21 is provided with a third recess 214 recessed relative to the second surface 213, and the electrode extraction hole 211 is provided in a bottom surface 214a of the third recess. At least a portion of the fixing member 40 is accommodated in the third recess 214.

[0181] For example, the electrode lead-out hole 211 penetrates a portion of the first wall 21 located 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 to the bottom surface 214a of the third recess and the first surface 212, respectively.

[0182] The third recess 214 may be a cylindrical recess, a conical recess, a stepped recess, or a recess of another shape.

[0183] Providing the third recess 214 reduces the dimension by which the fixing member 40 protrudes outward from the first wall 21, thereby reducing the external dimensions of the battery cell 6 and improving the energy density of the battery cell 6. The third recess 214 also positions the fixing member 40 and simplifies the process of connecting the fixing member 40 and the first wall 21.

[0184] In some embodiments, the third recess 214 is a stepped recess.

[0185] In some embodiments, the fixing member 40 has a connection surface 40a, which abuts against the bottom surface 214a of the third recess in the axial direction Z of the electrode lead-out hole 211. The connection surface 40a is flush with the end surface 30a of the electrode terminal 30 that faces the electrode assembly 10.

[0186] For example, the fixing member 40 and the first wall 21 are disposed along the axial direction Z of the electrode lead-out hole 211.

[0187] The connection surface 40a is flush with the end surface 30a of the electrode terminal 30 facing the electrode assembly 10, thereby reducing the size of the electrode terminal 30 that fits into the electrode withdrawal hole 211 and reducing the amount of internal space occupied by the electrode terminal 30 in the housing 20.

[0188] In some embodiments, the connecting surface 40a, the end surface 30a 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 with each other.

[0189] In some embodiments, the securing member 40 is provided on the side of the first wall 21 away from the electrode assembly 10 .

[0190] In the embodiment of the present application, it is not necessary for the entire fixing member 40 to protrude from the second surface 213 , and only a portion of the fixing member 40 may protrude from the second surface 213 .

[0191] In the embodiment of the present application, by providing the fixing member 40 on the side of the first wall 21 away from the electrode assembly 10, the amount of the fixing member 40 occupying the internal space of the housing 20 can be reduced.

[0192] In some embodiments, the fixing member 40 includes a first connecting portion 41, a second connecting portion 42, and a folded portion 43, and 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 together with the first connecting portion 41. The folded portion 43 goes around the outer periphery of the first connecting portion 41 and is folded toward the first wall 21. The second connecting portion 42 goes around the folded portion 43 and is connected to the first wall 21.

[0193] By bending the fixing member 40, the distance between the electrode assembly 10 and the first connection portion 41 can be increased, and the sealing member 50 and the electrode terminal 30 can be easily provided on the side of the first connection portion 41 facing the electrode assembly 10, thereby reducing the occupation of the internal space of the housing 20 by the electrode terminal 30.

[0194] Compared to the technical solution in which the sealing member 50 is sandwiched between the first wall 21 and the first flange 32, in the embodiment of the present application, the sealing member 50 is disposed between the first flange 32 and the first connection portion 41, so that the sealing member 50 and the electrode terminal 30 share space in the axial direction Z, and further, the dimension by which the electrode terminal 30 protrudes from the second surface 213 of the first wall 21 can be reduced, thereby improving the energy density.

[0195] In some embodiments, the first connecting portion 41 is surrounded by a through hole through which the terminal body 31 passes.

[0196] In some embodiments, the second connecting portion 42 is received in the third recess 214 .

[0197] In some embodiments, the second connecting portion 42 includes a connecting surface 40a that abuts the bottom surface 214a of the third recess.

[0198] 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, where the first insulating portion 61 is sandwiched between the first flange 32 and the first connecting portion 41 in the axial direction Z, and at least a portion of the third insulating portion 63 is sandwiched 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 and the first connecting portion 41.

[0199] The first insulating portion 61 is sandwiched between the first connecting portion 41 and the first flange 32, thereby reducing the risk that the first insulating member 60 will come off the electrode terminal 30.

[0200] Preferably, the third insulating portion 63 covers the outer surface of the first connecting portion 41 and the outer surface of the bent portion 43 .

[0201] In some embodiments, the material of the first insulating member 60 and the material of the second insulating member 70 are both plastic.

[0202] In some embodiments, the battery cell 6 includes a terminal assembly 7 , and the terminal assembly 7 includes an electrode terminal 30 , a fixing member 40 , a sealing member 50 , a first insulating member 60 and a second insulating member 70 .

[0203] For example, the terminal assembly 7 is assembled by providing an electrode terminal 30, the second flange 33 of which is not formed; fitting a sealing member 50 into a terminal body 31 and placing it on the first flange 32; attaching the fixing member 40 so that the electrode terminal 30 passes through the fixing member 40; pressing the sealing member 50 between the first connecting portion 41 of the fixing member 40 and the first flange 32 so that the compression amount of the sealing member 50 meets requirements; forming a first insulating member 60 and a second insulating member 70 by injection molding; and pressing the electrode terminal 30 to form the second flange 33 so that the electrode terminal 30 is crimped onto the fixing member 40.

[0204] The second flange 33 restricts the position of the third insulating portion 63, and can reduce the risk of the third insulating portion 63 floating up.

[0205] In some embodiments, the battery cell 6 further includes an adapter sheet 90 for electrically connecting the electrode terminal 30 and the tab of the electrode assembly 10 .

[0206] In some embodiments, the adapter sheet 90 abuts and connects to the end surface 30 a of the electrode terminal 30 .

[0207] In some embodiments, a portion of the adapter sheet 90 is accommodated in the electrode extraction hole 211 .

[0208] FIG. 8 is a cross-sectional schematic view of a battery cell according to another embodiment of the present application, FIG. 9 is an enlarged schematic view of the square blank C in FIG. 8, FIG. 10 is a cross-sectional schematic view of a terminal assembly of a battery cell according to another embodiment of the present application, and FIG. 11 is an enlarged schematic view of the circle D in FIG. 10.

[0209] 8 to 11 , in some embodiments, the sealing member 50 includes a sealing body 51 that surrounds the terminal body 31, and a second protrusion 53 that protrudes from a surface of the sealing body 51 that is remote from the first flange 32. In the axial direction Z of the electrode extraction hole 211, at least a portion of the sealing body 51 is interposed 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.

[0210] There may be one or more second protrusions 53. In some examples, there is one second protrusion 53, and the single second protrusion 53 is provided surrounding the terminal body 31, while in other examples, there are multiple second protrusions 53, and the multiple second protrusions 53 are provided at intervals along the circumferential direction of the terminal body 31.

[0211] 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.

[0212] The sealing body 51 can receive a force and compress at a portion sandwiched between the first flange 32 and the fixing member 40 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.

[0213] In some embodiments, the second protrusions 53 are sandwiched between the fixing member 40 and the terminal body 31 in the radial direction of the electrode terminal 30. The second protrusions 53 are compressed when subjected to a force, thereby improving the sealing performance.

[0214] In some embodiments, a projection of the first flange 32 at least partially overlaps a projection of the first wall 21 in the axial direction Z of the electrode extraction hole 211. The battery cell 6 further includes a second insulating member 70 for separating at least the first flange 32 and the first wall 21.

[0215] The first flange 32 is supported by the first wall 21, which increases the load-bearing capacity of the electrode terminal 30 in the axial direction Z and further stabilizes the electrode terminal 30. 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.

[0216] 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 recess 34 that is recessed relative to the end surface 30a and surrounds the end surface 30a. The second recess 34 extends in the radial direction of the electrode terminal 30 to the outer circumferential surface 322 of the first flange. The portion of the second insulating member 70 housed in the second recess 34 separates the first flange 32 from the first wall 21.

[0217] In the axial direction Z of the electrode lead-out hole 211, the end face 30a of the electrode terminal 30 is the face of the electrode terminal 30 closest to the electrode assembly 10. Illustratively, the end face 30a is a flat surface.

[0218] By providing the second recess 34, the second insulating member 70 and the electrode terminal 30 share more space in the axial direction Z, reducing the dimension by which the electrode terminal 30 protrudes from the first wall 21, thereby improving space utilization. Furthermore, by providing the second recess 34, the distance between the electrode terminal 30 and the first wall 21 can be increased, reducing the risk of electrical conduction between the electrode terminal 30 and the first wall 21.

[0219] By providing the second recess 34, the weight of the entire terminal assembly 7 can also be reduced.

[0220] 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.

[0221] According to the embodiments of the present application, the small size of the end face 30a of the electrode terminal 30 reduces the risk of the end face 30a and the first wall 21 overlapping in the axial direction Z, thereby reducing the risk of electrical conduction between the end face 30a and the first wall 21.

[0222] In some embodiments, a projection of the end face 30a 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.

[0223] In some embodiments, the cross section of the second insulating member 70 may be C-shaped, and the C-shaped structure can cover the edge of the first flange 32, improving insulation properties and reducing the risk of the second insulating member 70 falling off the electrode terminal 30.

[0224] FIG. 12 is a schematic cross-sectional view of a terminal assembly of a battery cell according to still another embodiment of the present application.

[0225] 12 , 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 a surface of the sealing body 51 facing the first flange 32. In the axial direction Z of the electrode extraction hole 211, at least a portion of the sealing body 51 is interposed 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 a surface of the sealing body 51 that is away from the first flange 32, and is provided between the fixing member 40 and the terminal body 31.

[0226] The embodiments of the present application can improve sealing performance.

[0227] FIG. 13 is a partial cross-sectional schematic view of a battery cell according to still another embodiment of the present application.

[0228] As shown in FIG. 13, in some embodiments, a portion of the electrode terminal 30 may be housed within the electrode lead-out hole 211.

[0229] In some embodiments, along a direction approaching the electrode assembly 10 , the electrode terminal 30 may extend beyond the first surface 212 of the first wall 21 .

[0230] In the embodiment of the present application, the electrode assembly 10 may be recessed inside the housing 20, thus simplifying the structure of the adapter sheet 90.

[0231] FIG. 14 is a partial cross-sectional schematic view of a battery cell according to still another embodiment of the present application.

[0232] As shown in FIG. 14, in some embodiments, the securing member 40 is integrally formed with the first wall 21 .

[0233] By providing the fixing member 40 integrally with the first wall 21, the connection strength between the first wall 21 and the fixing member 40 can be improved, and the process of connecting the first wall 21 and the fixing member 40 can be omitted.

[0234] According to some embodiments of the present application, the present application further provides a battery including a plurality of battery cells according to any of the above embodiments.

[0235] According to some embodiments of the present application, the present application further provides a power consumption device including the battery cell according to any of the above embodiments, the battery cell being used to provide electrical energy to the power consumption device. The power consumption device may be a facility or system to which any of the battery cells is applied.

[0236] 4 to 7 , one embodiment of the present application provides a battery cell 6 including 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 housing body 20a having an opening and an end cap 20b for closing the opening. An electrode extraction hole 211 is provided in the end cap 20b.

[0237] 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 provided to surround the electrode terminal 30 and connects the electrode terminal 30 to the end cap 20b.

[0238] 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 away from the electrode assembly 10. The electrode terminal 30 does not protrude from the first surface 212 in the direction facing the electrode assembly 10.

[0239] The electrode terminal 30 includes a terminal body 31, and a first flange 32 and a second flange 33 that protrude from an outer peripheral surface 311 of the terminal body. In the axial direction Z of the electrode extraction hole 211, at least a portion of the fixing member 40 is located between the first flange 32 and the second flange 33.

[0240] The sealing member 50 surrounds the terminal body 31. In the axial direction Z of the electrode extraction hole 211, at least a portion of the sealing member 50 is interposed between the first flange 32 and the fixing member 40. In the axial direction Z of the electrode extraction hole 211, the first insulating member 60 separates at least the second flange 33 and the fixing member 40. The second insulating member 70 separates at least the first flange 32 and the fixing member 40.

[0241] 8 to 11, another embodiment of the present application provides a battery cell 6 including 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 housing body 20a having an opening and an end cap 20b for closing the opening. An electrode extraction hole 211 is provided in the end cap 20b.

[0242] 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 provided to surround the electrode terminal 30 and connects the electrode terminal 30 to the end cap 20b.

[0243] 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 protrude from the first surface 212 in the direction facing the electrode assembly 10.

[0244] The electrode terminal 30 includes a terminal body 31 and a first flange 32 and a second flange 33 that protrude from an outer peripheral surface 311 of the terminal body. In the axial direction Z of the electrode extraction 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 separates at least the second flange 33 and the fixing member 40.

[0245] 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 interposed between the first flange 32 and the fixing member 40.

[0246] In the axial direction Z of the electrode extraction 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 separates at least the first flange 32 and the first wall 21.

[0247] The electrode terminal 30 has an end face 30a facing the electrode assembly 10, and is provided with a second recess 34 that is recessed relative to the end face 30a and surrounds the end face 30a. The second recess 34 extends radially of the electrode terminal 30 to the outer circumferential surface 322 of the first flange. The portion of the second insulating member 70 housed in the second recess 34 separates the first flange 32 from the first wall 21.

[0248] It should be noted that, unless contradictory, the embodiments and features of the embodiments in this application can be combined with each other.

[0249] It should be noted that the above examples are only for explaining the technical solutions of the present application, and are not intended to limit the same. Although the present application has been described in detail with reference to the above examples, those skilled in the art may still modify the technical solutions described in the above examples or make equivalent substitutions for some of the technical features therein, but it should be understood that these modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. a housing including a first wall provided with an electrode extraction hole; an electrode assembly contained within 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 provided to surround the electrode terminal and to connect the electrode terminal and the first wall; a sealing member that surrounds the electrode terminal and has at least a portion interposed between the electrode terminal and the fixing member; A battery cell comprising:

2. The electrode terminal includes 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. The battery cell according to claim 1 , wherein at least a portion of the sealing member is interposed between the first flange and the fixing member in the axial direction of the electrode lead-out hole.

3. The electrode terminal further includes a second flange protruding from an outer circumferential surface of the terminal body, 3. The battery cell according to claim 2, wherein the first flange and the second flange are spaced apart in the axial direction of the electrode extraction hole, 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 the second flange is located on a side of the first flange that is farther away from the electrode assembly in the axial direction of the electrode lead-out hole.

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

6. the sealing member includes a sealing body and a first projection, the sealing body surrounding the terminal body, the first projection protruding from a surface of the sealing body facing the first flange; At least a portion of the sealing body is interposed between the first flange and the fixing member in the axial direction of the electrode lead-out hole, The battery cell according to any one of claims 2 to 5, wherein at least a portion of the first flange is located between the first projection and the terminal body.

7. The first flange is provided with a first recess recessed into a surface of the first flange facing the sealing body, The battery cell according to claim 6 , wherein the first protrusion is housed in the first recess.

8. The sealing member includes a sealing body and a second protrusion, the sealing body surrounding the terminal body, and the second protrusion protruding from a surface of the sealing body away from the first flange; At least a portion of the sealing body is interposed between the first flange and the fixing member in the axial direction of the electrode lead-out hole, The battery cell according to any one of claims 2 to 7, wherein the second protrusion is provided between the fixing member and the terminal body.

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

10. a projection of the first flange and a projection of the first wall at least partially overlap in an axial direction of the electrode lead-out hole; The battery cell according to any one of claims 2 to 8, further comprising a second insulating member for separating at least the first flange and the first wall.

11. The battery cell according to any one of claims 2 to 10, further comprising a second insulating member for separating at least the first flange and the fixing member.

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

13. the electrode terminal has an end surface facing the electrode assembly, and a second recess is provided in the electrode terminal, the second recess being recessed relative to the end surface and surrounding the end surface; the second recess extends to an outer peripheral surface of the first flange in a radial direction of the electrode terminal, The battery cell according to claim 11 or 12, wherein a portion of the second insulating member housed in the second recess separates the first flange from the first wall.

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

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

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

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

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

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

20. the fixing member includes a first connecting portion, a second connecting portion, and a bent portion, and at least a portion of the electrode terminal is located on a side of the first connecting portion facing the electrode assembly and sandwiches the sealing member together with the first connecting portion; 20 . The battery cell of claim 19 , wherein the bent portion surrounds an outer periphery of the first connection portion and is bent toward the first wall, and the second connection portion surrounds the bent portion and is connected to the first wall.

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

22. The housing includes a housing body having an opening and an end cap to be fitted over and coupled to the opening, The battery cell according to any one of claims 1 to 21, wherein the end cap is the first wall.

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

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

25. A power consuming device comprising a battery cell according to any one of claims 1 to 23, said battery cell being adapted to supply electrical energy.

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