Battery monomer, battery and electric device

Abstract

The utility model provides a battery monomer, a battery and a power utilization device, the battery monomer comprises a shell, an electrode assembly, an electrode terminal and a sealing piece, the shell comprises a first wall, the first wall is provided with a plurality of electrode lead-out holes, and the electrode assembly is arranged in the shell and comprises a tab. The electrode terminal is disposed on the first wall and electrically connected to the tab, and a single electrode terminal covers the plurality of electrode lead-out holes in the thickness direction of the first wall. The sealing member is at least partially disposed between the first wall and the electrode terminal and seals the plurality of electrode lead-out holes. In the embodiment of the invention, the plurality of electrode lead-out holes are formed in the first wall, and the single electrode terminal is arranged corresponding to the plurality of electrode lead-out holes, so that the radial size corresponding to the single electrode lead-out hole can be reduced, and the size corresponding to the partial structure for sealing the single electrode lead-out hole in the sealing element is reduced; and the small size often means a small risk of deformation failure, so that the corresponding sealing reliability of the battery monomer can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular 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 ships, electric toy cars, electric toy ships, electric toy airplanes, and electric tools, etc. Battery cells can include nickel-cadmium battery cells, nickel-hydrogen battery cells, lithium-ion battery cells, and secondary alkaline zinc-manganese battery cells, etc.

[0003] However, there may be a risk of sealing failure inside the battery cell, affecting the normal use of the battery cell. Utility Model Content

[0004] In view of the above problems, the present application provides a battery cell, a battery and an electrical device, which can improve the sealing reliability of the battery cell.

[0005] On the one hand, an embodiment of the present application provides a battery cell, including a housing, an electrode assembly, an electrode terminal, and a seal, wherein the housing includes a first wall, the first wall is provided with a plurality of electrode lead-out holes, and the electrode assembly is disposed in the housing and includes a tab. The electrode terminal is disposed on the first wall and electrically connected to the tab, and in the thickness direction of the first wall, a single electrode terminal covers the plurality of electrode lead-out holes. At least a portion of the seal is disposed between the first wall and the electrode terminal and seals the plurality of electrode lead-out holes.

[0006] In the above scheme, a plurality of electrode lead-out holes are provided on the first wall, and a single electrode terminal is provided corresponding to the plurality of electrode lead-out holes. This can reduce the radial dimension corresponding to the single electrode lead-out hole, thereby reducing the size corresponding to the partial structure of the seal used to seal the single electrode lead-out hole. A smaller size often means a smaller risk of deformation failure, thus helping to improve the corresponding sealing reliability of the battery cell.

[0007] In some embodiments, the electrode terminal includes a terminal body and multiple connecting parts, the terminal body is located on the side of the first wall away from the electrode assembly, the connecting parts are at least partially located in the electrode lead-out hole, and at least partially the seal is located between the terminal body and the first wall.

[0008] In the above solution, at least a part of the seal is disposed between the terminal body and the first wall, so that the seal can meet the sealing requirement of the electrode lead-out holes. Further, the structure of the seal between the terminal body and the first wall can include a plurality of different structures corresponding to the plurality of electrode lead-out holes, and the projections of the respective structures in the thickness direction can surround the electrode lead-out holes to achieve separate sealing of the plurality of electrode lead-out holes. In this way, the size of the part of the seal corresponding to a single electrode lead-out hole can be reduced, and the risk of seal failure of the battery cell can be lowered.

[0009] In some embodiments, the battery cell further includes a fixing member and an insulating member. The fixing member is disposed around the circumferential side of the terminal body, and in the thickness direction, a part of the terminal body is clamped between the fixing member and the first wall. The insulating member is at least partially located between the fixing member and the terminal body.

[0010] In the above solution, the mutual cooperation among the electrode terminal, the fixing member, and the insulating member can meet the need to fix the electrode terminal to the first wall, and in this way, operations such as flanging the electrode terminal are not required, thereby simplifying the structural complexity of the battery cell at the electrode terminal, and also reducing the occupation of the internal space of the housing by the electrode terminal, which is beneficial to improving the energy density of the battery cell and has strong practicability.

[0011] In some implementations, the seal includes a plurality of sealing rings disposed around the circumferential side of the connecting portion.

[0012] In the above solution, by providing the seal to include a plurality of sealing rings corresponding to the plurality of electrode lead-out holes, the plurality of electrode lead-out holes can be separately sealed by means of the plurality of sealing rings. Compared with the technical solution in the related art where the seal only includes one sealing ring, this design helps to reduce the size of a single sealing ring, and further reduces the risk of deformation and failure of the sealing ring, improving the sealing reliability of the battery cell.

[0013] In some embodiments, the seal further includes a connecting member connecting different sealing rings.

[0014] In the above solution, by providing a connecting member in the seal, relative fixation between different sealing rings can be achieved by means of the connecting member. Further, during the preparation process of the battery cell, a plurality of seals can be assembled on the first wall together, thereby improving the assembly efficiency.

[0015] In some embodiments, the sealing ring and the connecting member are integrally formed.

[0016] In the above solution, by integrally forming the sealing ring and the connecting member, the structural reliability between the sealing ring and the connecting member can be improved. Moreover, this can also eliminate the welding process, reduce the adverse effects of the welding process on the sealing ring and the connecting portion, and improve the structural reliability of the corresponding sealing ring and connecting member.

[0017] In some embodiments, the sealing ring includes a first portion on the first wall facing away from the electrode assembly, and the connecting member is connected to different first portions. In the thickness direction of the first wall, the size of the connecting member is smaller than that of the first portion.

[0018] In the above solution, by setting the size of the connecting member in the thickness direction to be smaller than that of the first portion, in the battery cell, the first portion can be compressed to improve the sealing reliability, while the connecting member will not be compressed or the degree of compression is relatively low, thereby reducing the magnitude of the force exerted by the connecting member on the first wall and reducing the risk of deformation of the portion of the first wall between adjacent electrode lead-out holes, and improving the reliability of the battery cell.

[0019] In some embodiments, the first wall includes a rib structure located between adjacent electrode lead-out holes.

[0020] In the above solution, due to the existence of the electrode lead-out holes, the structural strength of the local structure of the first wall between adjacent electrode lead-out holes is usually relatively low. In order to improve the anti-deformation ability of the first wall, in the embodiments of the present application, a rib structure is provided between adjacent electrode lead-out holes, thereby improving the structural strength of the first wall at the position between adjacent electrode lead-out holes, reducing the risk of excessive deformation of the first wall, and improving the reliability of the battery cell.

[0021] In some embodiments, the first wall includes a terminal mounting portion and a boss structure protruding from the side of the terminal mounting portion facing away from the electrode assembly. The electrode lead-out hole penetrates through the terminal mounting portion, and the boss structure is disposed around the outer peripheral side of the electrode lead-out hole, and the boss structure is snap-connected to the sealing member.

[0022] In the above solution, by providing a boss structure on the first wall and snap-fitting the boss structure with the sealing member, the installation reliability between the sealing member and the first wall is improved. Moreover, the existence of the boss structure can play a role in positioning and limiting the sealing member, and improve the reliability of the relative position between the first wall and the sealing member.

[0023] In some embodiments, the battery cell further includes an insulating member, and the insulating member is partially disposed around the circumference of the electrode terminal. In the thickness direction of the first wall, the insulating member is located between the first wall and the electrode terminal and connects the first wall and the electrode terminal.

[0024] In the above scheme, in addition to insulating the electrode terminal from the first wall to meet the insulation requirements of the electrode terminal, the insulating member can also be connected to the first wall so that the first wall has a certain anti-deformation ability, thereby improving the overall structural reliability of the battery cell and having strong practicality.

[0025] In some embodiments, the insulating member includes a support portion, a first protrusion protruding from the support portion away from the electrode assembly, and a second protrusion protruding from the support portion toward the electrode assembly. The first protrusion is plug-connected to the electrode terminal, and the second protrusion is plug-connected to the first wall.

[0026] In the above solution, the first protrusion in the insulating member can be plugged and connected to the electrode terminal, and the second protrusion can be plugged and connected to the first wall. Compared with other connection methods, the plug-in connection method is simple to operate and can achieve the fixation between the insulating member relative to the electrode terminal and the first wall. Furthermore, the first protrusion and the second protrusion are both fixed to the support part. When the first wall is deformed, the support part can provide a certain stress to the first wall, so that the first wall has a certain anti-deformation ability, thereby improving the overall structural reliability of the battery cell.

[0027] In some embodiments, the electrode terminal includes a terminal body located on the side of the first wall facing away from the electrode assembly, the terminal body having a first surface facing the electrode assembly, and a first recess formed by the first surface being recessed inwardly. In the direction from the electrode assembly to the electrode terminal, the radial size of the first recess gradually increases, and the first protrusion is located in the first recess. And / or, the first wall includes a terminal mounting portion, the terminal mounting portion having a second surface facing away from the electrode assembly, and an electrode lead-out hole and a second recess formed by the second surface being recessed inwardly and staggered. In the direction from the electrode assembly to the electrode terminal, the radial size of the second recess gradually decreases, and the second protrusion is located in the second recess.

[0028] In the above scheme, by providing a connection hole in the current collecting member, the current collecting member and the electrode terminal can be relatively positioned with the help of the connection hole, thereby improving the position reliability between the two. At the same time, this design can also reduce the distance between the current collecting member and the first wall in the thickness direction, so that the part of the structure of the current collecting member located between adjacent connection holes can support the first wall to a certain extent, further improving the corresponding deformation resistance of the first wall.

[0029] In some embodiments, in the thickness direction, the orthographic projection of the electrode lead-out hole covers and exceeds the orthographic projection of the connection hole. The distance between the inner wall surface of the electrode lead-out hole and the inner wall surface of the connection hole in the direction parallel to the first wall is D, and D satisfies: 0<D≤3mm.

[0030] In the above solution, by providing connection holes in the current collector member, the current collector member and the electrode terminal can be fixedly connected by butt welding, thereby reducing the adverse effect of the welding process on the first wall, reducing the size corresponding to the distance D, and further reducing the distance A between adjacent different connection holes, so as to improve the anti-deformation ability of the part of the current collector member located between adjacent connection holes and its supporting ability for the first wall, and improve the structural reliability of the first wall during use.

[0031] In some embodiments, the battery cell further includes a current collector member, and the tab is electrically connected to the electrode terminal through the current collector member. The current collector member includes a main body portion and a plurality of protruding portions protruding from the main body portion. The protruding portions are at least partially located in the electrode lead-out holes and are connected to the electrode terminals.

[0032] In the above solution, by providing protruding portions in the current collector member and inserting the protruding portions into the electrode lead-out holes to achieve connection with the electrode terminals, this design enables the electrode terminals not to enter the space where the electrode assembly is located, thereby reducing the occupation of the internal space of the housing by the electrode terminals and improving the energy density of the battery cell.

[0033] In some embodiments, the first wall includes a third surface facing the electrode assembly, and a part of the electrode terminal extends beyond the third surface and is connected to the tab.

[0034] In the above solution, the electrode terminal can enter the space where the electrode assembly is located through the electrode lead-out hole, and a part of the electrode terminal can also extend beyond the third surface. On this basis, by directly connecting the electrode terminal to the tab, the current collector member is cancelled, thereby simplifying the structural layout inside the battery cell.

[0035] In some embodiments, the battery cell further includes a current collector member connected to the tab. The first wall includes a third surface facing the electrode assembly, and a part of the electrode terminal extends beyond the third surface and is connected to the surface of the current collector member facing the electrode terminal.

[0036] In the above solution, the electrode terminal can enter the space where the electrode assembly is located through the electrode lead-out hole, and a part of the electrode terminal can also extend beyond the third surface. On this basis, the electrode terminal can be connected to the current collector member by penetration welding, and the electrical connection between the electrode terminal and the tab is realized by means of the current collector member.

[0037] In a second aspect, an embodiment of the present application provides a battery, which includes the battery cell in any of the foregoing embodiments.

[0038] In a third aspect, an embodiment of the present application provides an electrical device, which includes the battery cell in any of the foregoing embodiments, and the battery cell is used to provide electrical energy.

[0039] The above description is only an overview of the technical solution of this application. In order to understand the technical means of this application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of this application more obvious and understandable, the following specific embodiments of this application are specifically given. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of this application, the following will briefly introduce the drawings required to be used in the embodiments of this application. Obviously, the following described drawings are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0041] Figure 1 is a schematic structural diagram of a vehicle provided by an embodiment of this application;

[0042] Figure 2 is an exploded structural diagram of a battery provided by an embodiment of this application;

[0043] Figure 3 is an internal structural diagram of a battery module provided by an embodiment of this application;

[0044] Figure 4 is a cross-sectional structural diagram of a battery cell provided by an embodiment of this application;

[0045] Figure 5 is Figure 4 an enlarged structural diagram of region Q in

[0046] Figure 6 is Figure 5 an enlarged structural diagram of region P in

[0047] Figure 7 is a structural diagram of the first wall in another battery cell provided by an embodiment of this application;

[0048] Figure 8 is a structural diagram of the first wall in another battery cell provided by an embodiment of this application;

[0049] Figure 9 is Figure 5 a cross-sectional structural diagram taken along line A-A in

[0050] Figure 10 is a partial cross-sectional structural diagram of another battery cell provided by an embodiment of this application;

[0051] Figure 11 is a partial cross-sectional structural diagram of another battery cell provided by an embodiment of this application;

[0052] Figure 12 It is a schematic diagram of a partial cross-sectional structure of another battery cell provided by an embodiment of the present application;

[0053] Figure 13 It is a schematic diagram of a partial cross-sectional structure of another battery cell provided by an embodiment of the present application.

[0054] In the drawings:

[0055] 1000, vehicle;

[0056] 100, battery; 200, controller; 300, motor; 400, box body; 41, first box body part; 42, second box body part; 500, battery cell; 600, battery module;

[0057] 10, outer shell; 11, first wall; 12, electrode lead-out hole; 13, terminal mounting part; 14, second recess; 15, boss structure;

[0058] 20, electrode assembly; 21, tab;

[0059] 30, electrode terminal; 31, terminal main body; 32, connecting part; 33, first recess;

[0060] 40, seal; 41, sealing ring; 411, first part; 42, connecting piece; 43, groove structure;

[0061] 50, insulating part; 51, supporting part; 52, first protrusion; 53, second protrusion;

[0062] 60, fixing part;

[0063] 70, current collector member; 71, connecting hole; 72, main body part; 73, protrusion;

[0064] M1, first surface; M2, second surface; M3, third surface;

[0065] J, reinforcing rib structure;

[0066] X, thickness direction. Detailed implementation manners

[0067] Hereinafter, embodiments of the technical solutions of the present application will be described in detail with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and thus are only examples and cannot be used to limit the protection scope of the present application.

[0068] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs; the terms used herein 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 description of the drawings are intended to cover non-exclusive inclusion.

[0069] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order, or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, "a plurality of" means more than two, unless otherwise specifically defined.

[0070] Referring to "embodiments" herein means that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase may not necessarily refer to the same embodiment when it appears in various places in the specification, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0071] In the description of the embodiments of this application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0072] In the description of the embodiments of this application, the term "a plurality of" refers to more than two (including two). Similarly, "a plurality of groups" refers to more than two groups (including two groups), and "a plurality of pieces" refers to more than two pieces (including two pieces).

[0073] In the description of the embodiments of this application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of this application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of this application.

[0074] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0075] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can activate the active material and continue to be used by charging after discharging.

[0076] The battery cell can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium-metal battery, a sodium-metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present application do not limit this.

[0077] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can play a role in preventing short circuit between the positive and negative electrodes to a certain extent, and at the same time allow active ions to pass through.

[0078] In some embodiments, the positive electrode can be a positive electrode sheet, and the positive electrode sheet can include a positive electrode current collector and a positive electrode active material provided on at least one surface of the positive electrode current collector.

[0079] As an example, the positive electrode current collector has two surfaces opposite to each other in its own thickness direction, and the positive electrode active material is provided on any one or both of the two opposite surfaces of the positive electrode current collector.

[0080] As an example, the positive electrode current collector can adopt a metal foil or a composite current collector. For example, as a metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. can be used. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0081] 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 their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as the positive electrode active material of the battery can also be used. These positive electrode active materials can be used alone or in combination of two or more. Among them, examples of the lithium-containing phosphate may include, but are not limited to, lithium iron phosphate (such as LiFePO4 (which can also be abbreviated as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and at least one of a composite material of lithium manganese iron phosphate and carbon.

[0082] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0083] As an example, the negative electrode current collector can be a metal foil, a foam metal, or a composite current collector. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, titanium, etc. can be used. The foam metal can be foam nickel, foam copper, foam aluminum, foam alloy, or foam carbon, etc. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (such as copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0084] 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.

[0085] As an example, the negative electrode current collector has two surfaces opposite to each other in its own thickness direction, and the negative electrode active material is disposed on either one or both of the two opposite surfaces of the negative electrode current collector.

[0086] As an example, the negative electrode active material can be a negative electrode active material for a battery cell known in the art. 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, etc.

[0087] In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0088] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0089] In some embodiments, the separator is a separator membrane. The present application does not particularly limit the type of the separator membrane, and any well-known porous structure separator membrane with good chemical stability and mechanical stability can be selected.

[0090] As an example, the main material of the separator membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics.

[0091] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive electrode and the negative electrode, and simultaneously functions to transport ions and isolate the positive and negative electrodes.

[0092] In some embodiments, the battery cell further includes an electrolyte, and the electrolyte functions to conduct ions between the positive and negative electrodes. The present application does not specifically limit the type of the electrolyte, and it can be selected according to requirements. The electrolyte can be liquid, gel-like, or solid.

[0093] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0094] In some embodiments, the electrode assembly is a stacked structure.

[0095] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or multi-prismatic, etc.

[0096] In some embodiments, the electrode assembly is provided with electrode tabs, and the electrode tabs can conduct the current out of the electrode assembly. The electrode tabs include a positive electrode tab and a negative electrode tab.

[0097] In some embodiments, the battery cell can include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0098] In some embodiments, functional components such as electrode terminals can be provided on the housing. The electrode terminals can be used for electrically connecting to the electrode assembly to output or input the electrical energy of the battery cell.

[0099] In some embodiments, a current collecting member can be provided inside the housing, and the electrode assembly can be electrically connected to the housing or the electrode terminals provided on the housing through the current collecting member.

[0100] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell, or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal-prismatic battery, etc. The present application has no particular limitation.

[0101] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0102] 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.

[0103] In some embodiments, the battery may be a battery pack. The battery pack includes a box body and battery cells, and the battery cells or battery modules are accommodated in the box body.

[0104] In some embodiments, the box body may be part of the chassis structure of a vehicle. For example, part of the box body may become at least part of the floor of the vehicle, or part of the box body may become at least part of the crossbeam and longitudinal beam of the vehicle.

[0105] In some embodiments, the battery may be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0106] The battery cell includes an electrode assembly, a first wall, electrode terminals provided on the first wall, and a sealing structure at least partially located between the first wall and the electrode terminals. The sealing structure is a structural component for achieving a sealing effect, and the size of the sealing structure is generally positively correlated with the size of the electrode terminals, that is, the larger the size of the electrode terminals, the larger the corresponding size of the sealing structure.

[0107] Furthermore, as the overcurrent capacity of the battery cell increases, the corresponding size of the electrode terminals also needs to be increased, thereby increasing the size of the sealing structure. For the sealing structure, on the premise of the same degree of deformation, the larger the size of the sealing structure, the more likely it is to undergo deformation failure, thereby causing the problem of sealing failure of the battery cell.

[0108] Based on the above technical problems, the present application provides a battery cell, a battery, and an electrical device. By providing a plurality of electrode lead-out holes and setting the seal to seal the plurality of electrode lead-out holes, the part of the seal structure for sealing a single electrode lead-out hole has a smaller size, and the smaller size helps to reduce the risk of deformation failure of the seal and improve the sealing reliability of the battery cell.

[0109] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical devices using batteries. The electrical devices include, for example, mobile phones, portable devices, laptop computers, battery cars, electric vehicles, ships, spacecrafts, electric toys, and electric tools, etc. Among them, spacecrafts include, for example, airplanes, rockets, space shuttles, and spaceships, etc. Electric toys include, for example, stationary or mobile electric toys, specifically, for example, game consoles, electric vehicle toys, electric ship toys, and electric airplane toys, etc. Electric tools include, for example, metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, specifically, for example, electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact electric drills, concrete vibrators, and electric planers.

[0110] The battery cells described in the embodiments of the present application are not limited to being applicable to the above-described electrical devices. However, for the sake of simplicity of description, the following embodiments will be described by taking electric vehicles as an example.

[0111] Please refer to Figure 1 , Figure 1 which is a schematic diagram of a vehicle 1000 provided by the embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. A battery 100 can be disposed inside the vehicle 1000. Specifically, for example, the battery 100 can be disposed at the bottom, the front end, or the rear end of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000. For example, the battery 100 can be used as the operating power source of the vehicle 1000. The vehicle 1000 can also include a controller 200 and a motor 300. The controller 200 is used to control the power supply of the battery to the motor 300, for example. The battery can be used for starting, navigation, etc. of the vehicle 1000. Of course, the battery 100 can also be used to drive the vehicle 1000 to travel, replacing or partially replacing fuel or natural gas to provide driving force for the vehicle 1000.

[0112] Figure 2 which is an explosion schematic diagram of a battery provided by some embodiments of the present application. As Figure 2 shown, the battery 100 includes a box body 400 and battery cells (not shown in the figure). The battery cells are accommodated in the box body 400.

[0113] The housing 400 is used to accommodate battery cells, and the housing 400 can have various structures. In some embodiments, the housing 400 may include a first housing portion 41 and a second housing portion 42. The first housing portion 41 and the second housing portion 42 are covered with each other, and the first housing portion 41 and the second housing portion 42 jointly define a receiving portion for accommodating battery cells. The second housing portion 42 may be a hollow structure with one end open, and the first housing portion 41 is a plate-like structure. The first housing portion 41 covers the open side of the second housing portion 42 to form a housing with a receiving portion; both the first housing portion 41 and the second housing portion 42 may also be hollow structures with one side open, and the open side of the first housing portion 41 covers the open side of the second housing portion 42 to form a housing 400 with a receiving portion. Of course, the first housing portion 41 and the second housing portion 42 can have various shapes, such as a cylinder, a cuboid, etc.

[0114] In the battery 100, there can be one or multiple battery cells. If there are multiple battery cells, the multiple battery cells can be connected in series, parallel, or in a mixed connection. A mixed connection means that there are both series and parallel connections among the multiple battery cells. The multiple battery cells can be directly connected in series, parallel, or in a mixed connection together, and then the whole formed by the multiple battery cells is accommodated in the housing 400; of course, it can also be that multiple battery cells are first connected in series, parallel, or in a mixed connection to form battery modules 600, and then the multiple battery modules 600 are connected in series, parallel, or in a mixed connection to form a whole and are accommodated in the housing 400.

[0115] Figure 3 For Figure 2 the structural schematic diagram of the battery module 600 shown. In some embodiments, as Figure 3 shown, there are multiple battery cells 500. The multiple battery cells 500 are first connected in series, parallel, or in a mixed connection to form battery modules 600. The multiple battery modules 600 are then connected in series, parallel, or in a mixed connection to form a whole and are accommodated in the housing.

[0116] Next, the structure of the battery cell will be described with reference to the accompanying drawings.

[0117] Please refer to Figure 4 and Figure 5 , the battery cell 500 includes a housing 10, an electrode assembly 20, an electrode terminal 30, and a seal 40. The housing 10 includes a first wall 11. The first wall 11 is provided with a plurality of electrode lead-out holes 12. The electrode assembly 20 is disposed inside the housing 10 and includes tab ears 21. The electrode terminal 30 is disposed on the first wall 11 and is electrically connected to the tab ears 21. In the thickness direction X of the first wall 11, a single electrode terminal 30 covers a plurality of electrode lead-out holes 12. At least a part of the seal 40 is disposed between the first wall 11 and the electrode terminal 30 and seals the plurality of electrode lead-out holes 12.

[0118] The battery cell 500 is a component structure for providing electrical energy. The battery cell 500 is provided with a housing 10, and the housing 10 has a hollow structure. The housing 10 is used to protect other component structures located inside it. Components such as the electrode assembly 20 can be arranged inside the housing 10, and the electrode assembly 20 is the main component in the electrode monomer for providing electrical energy.

[0119] The shape of the housing 10 can be determined according to the specific shape of the electrode assembly 20, that is, the shape of the housing 10 can be adapted to the shape of the electrode assembly 20. For example, when the electrode assembly 20 is a cylindrical structure, a cylindrical housing 10 can be selected; when the electrode assembly 20 is a cuboid structure, a cuboid housing 10 can be selected. Or according to different actual needs, the shape of the housing 10 can also be different from the shape of the electrode assembly 20. For example, when the electrode assembly 20 is a cylindrical structure, the housing 10 can be a cuboid structure or other polyhedron structures; when the electrode assembly 20 is a cuboid structure, the housing 10 can be a cylindrical structure.

[0120] In some embodiments, the housing 10 can be a sealed structure or a non-sealed structure. As an example, when the housing 10 is a sealed structure, the housing 10 can protect the electrode assembly 20 and prevent, for example, electrolyte leakage. When the housing 10 is a non-sealed structure, the housing 10 can protect the electrode assembly 20, and a sealing bag can be further included between the housing 10 and the electrode assembly 20. The sealing bag is used to encapsulate the electrode assembly 20 and the electrolyte, etc. Specifically, the sealing bag can be a bag-shaped insulating part or an aluminum-plastic film.

[0121] The electrode assembly 20 includes electrode tabs 21, and the electrode tabs 21 are electrically connected to the electrode terminals 30. The electrode terminals 30 are used to output or input the electrical energy of the battery cell 500. Optionally, the electrode tabs 21 are correspondingly arranged, the electrode assembly 20 includes two electrode tabs 21 with different polarities, and the number of the electrode terminals 30 can also be two. The two electrode terminals 30 are insulated from each other and are respectively electrically connected to different electrode tabs 21.

[0122] The first wall 11 is a wall surface structure on the housing 10, and the electrode lead-out holes 12 penetrate through the first wall 11 along the thickness direction X of the first wall 11. The electrode terminals 30 are fixed to the first wall 11. In the thickness direction X of the first wall 11, a single electrode terminal 30 covers multiple electrode lead-out holes 12, that is, the projection of a single electrode terminal 30 in the thickness direction X can overlap with the projections of multiple electrode lead-out holes 12 in the thickness direction X at the same time.

[0123] It should be noted that there can be various positional relationships between the electrode terminal 30 and the electrode lead-out hole 12. For example, the electrode terminal 30 can be completely located within the electrode lead-out hole 12, or the electrode terminal 30 can be partially located within the electrode lead-out hole 12 and partially located on at least one side of the first wall 11 in the thickness direction X, or the electrode terminal 30 can be completely located outside the electrode lead-out hole 12, as long as it satisfies that the electrode terminal 30 can be connected to the space where the electrode assembly 20 is located through the electrode lead-out hole 12, or the electrode terminal 30 enters the space where the electrode assembly 20 is located through the electrode lead-out hole 12 to meet the electrical connection requirement between the electrode terminal 30 and the tab 21 in the electrode assembly 20.

[0124] The seal 40 is a structural component for achieving a sealing effect. The seal 40 is at least partially clamped between the electrode terminal 30 and the first wall 11 in the thickness direction X to seal off the electrode lead-out hole 12 from the external environment of the battery cell 500. The seal 40 has various materials and structural forms. For example, the seal 40 can include materials such as rubber, and the seal 40 can be completely clamped between the electrode terminal 30 and the first wall 11 in the thickness direction X, or the seal 40 can be partially clamped between the electrode terminal 30 and the first wall 11 and partially located within the electrode lead-out hole 12.

[0125] The seal 40 can be arranged to seal multiple electrode lead-out holes 12. Specifically, the seal 40 can include multiple different structures corresponding to the multiple electrode lead-out holes 12. Each structure is arranged on the first wall 11 and the projection in the thickness direction X of the first wall 11 can surround a single electrode lead-out hole 12 to achieve the sealing effect on each electrode lead-out hole 12. Among them, according to different actual needs, the multiple different structures corresponding to the multiple electrode lead-out holes 12 in the seal 40 can be connected to each other or can be spaced apart from each other.

[0126] In the related art, a single electrode terminal 30 is only correspondingly arranged with a single electrode lead-out hole 12. An increase in the size of the electrode terminal 30 will lead to an increase in the corresponding radial size of the electrode lead-out hole 12, and further cause an increase in the size of the sealing structure surrounding the electrode lead-out hole 12, which easily leads to the problem of sealing failure of the battery cell 500.

[0127] In the embodiment of the present application, multiple electrode lead-out holes 12 are provided on the first wall 11, and a single electrode terminal 30 is correspondingly arranged with multiple electrode lead-out holes 12. This can reduce the corresponding radial size of a single electrode lead-out hole 12, thereby reducing the size of the part of the seal 40 used to seal a single electrode lead-out hole 12. A smaller size often means a smaller risk of deformation and failure, so it helps to improve the sealing reliability of the battery cell 500.

[0128] In some embodiments, such asFigure 4 and Figure 5 As shown in Figure 5 , the electrode terminal 30 includes a terminal body 31 and a plurality of connecting portions 32. The terminal body 31 is located on the side of the first wall 11 away from the electrode assembly 20. At least a part of the connecting portion 32 is located in the electrode lead-out hole 12, and at least a part of the seal 40 is located between the terminal body 31 and the first wall 11.

[0129] The electrode terminal 30 at least includes a terminal body 31 and a connecting portion 32. The terminal body 31 is a partial structure of the electrode terminal 30 located on the side of the first wall 11 away from the electrode assembly 20. Optionally, the battery may include a plurality of battery cells 500 and a current collecting member. The current collecting member may be connected to the terminal bodies 31 in different battery cells 500 to achieve series or parallel connection between different battery cells 500.

[0130] The connecting portion 32 is connected to the terminal body 31. The connecting portion 32 may be made of the same material as the terminal body 31 and be formed together in the same process. Or the connecting portion 32 may also be made of a different material from the terminal body 31 and be connected and fixed by welding or other means. The number of the connecting portions 32 is multiple, and at least a part of the multiple connecting portions 32 are respectively arranged in multiple electrode lead-out holes 12. The multiple connecting portions 32 are correspondingly arranged with the multiple electrode lead-out holes 12. Among them, there may be various positional relationships between the connecting portion 32 and the electrode lead-out hole 12. For example, the connecting portion 32 may be completely located in the electrode lead-out hole 12, or the connecting portion 32 may also partially extend beyond the surface of the first wall 11 facing the electrode assembly 20, so that the connecting portion 32 partially penetrates into the space where the electrode assembly 20 is located.

[0131] At least a part of the structure of the seal 40 is clamped between the terminal body 31 and the first wall 11 in the thickness direction X. Further, the projection of the structure of the seal 40 located between the terminal body 31 and the first wall 11 in the thickness direction X surrounds the projection of the electrode lead-out hole 12 in the thickness direction X to achieve the sealing effect of the electrode lead-out hole 12. Among them, there may be various positional relationships between the seal 40 and the electrode lead-out hole 12. For example, the seal 40 may be completely located on the side of the first wall 11 away from the electrode assembly 20, that is, the seal 40 is completely outside the electrode lead-out hole 12, or the seal 40 may be partially located on the side of the first wall 11 away from the electrode assembly 20 and partially located in the electrode lead-out hole 12. Among them, the part of the structure of the seal 40 located in the electrode lead-out hole 12 can be used for positioning.

[0132] In the embodiments of the present application, by disposing at least a part of the seal 40 between the terminal body 31 and the first wall 11, the seal 40 can meet the sealing requirement of the electrode lead-out holes 12. Further, the structure of the seal 40 between the terminal body 31 and the first wall 11 can include a plurality of different structures corresponding to the plurality of electrode lead-out holes 12, and the projections of the respective structures in the thickness direction X can surround the electrode lead-out holes 12 to achieve separate sealing of the plurality of electrode lead-out holes 12, thereby reducing the size of the part of the seal 40 corresponding to sealing a single electrode lead-out hole 12 and reducing the risk of seal failure of the battery cell 500.

[0133] It should be noted that in some other embodiments, the electrode terminal 30 may also only include the terminal body 31, that is, the electrode terminal 30 is completely located on the side of the first wall 11 away from the electrode assembly 20. In this case, at least a part of the structure in the seal 40 is also clamped between the terminal body 31 and the first wall 11 in the thickness direction X. Further optionally, the battery cell 500 further includes a current collecting member 70, and the current collecting member 70 needs to be partially located in the electrode lead-out holes 12 to meet the electrical connection requirement between the electrode terminal 30 and the tab 21.

[0134] In some embodiments, as Figure 4 and Figure 5 shown, the battery cell 500 further includes a fixing member 60 and an insulating member 50. The fixing member 60 is disposed around the circumferential side of the terminal body 31, and in the thickness direction X, the terminal body 31 is partially clamped between the fixing member 60 and the first wall 11. The insulating member 50 is at least partially located between the fixing member 60 and the terminal body 31.

[0135] The fixing member 60 is a component structure for realizing the relative fixation between the electrode terminal 30 and the first wall 11. The insulating member 50 surrounds the terminal body 31 and is at least partially located between the fixing member 60 and the terminal body 31. The insulating member 50 includes an insulating material and is a component structure for playing an insulating role.

[0136] During the preparation process of the battery cell 500, the outer shell 10 of the battery cell 500 can be first assembled and fixed, then the electrode terminal 30, the fixing member 60, and the insulating member 50 are connected and fixed by welding or other means, and finally the electrode terminal 30, the fixing member 60, and the insulating member 50 are jointly fixed to the outer shell 10 to achieve the insulating fixation of the electrode terminal 30 relative to the outer shell 10.

[0137] In the embodiment of the present application, the mutual cooperation among the electrode terminal 30, the fixing member 60 and the insulating member 50 can meet the need of fixing the electrode terminal 30 to the first wall 11, and there is no need to perform flanging operations on the electrode terminal 30, thereby simplifying the structural complexity of the battery cell 500 at the electrode terminal 30, and can also reduce the occupation of the internal space of the outer shell 10 by the electrode terminal 30, which is beneficial to improve the corresponding energy density of the battery cell 500 and has strong practicality.

[0138] In some implementations, see Figures 4 to 6 The sealing member 40 includes a plurality of sealing rings 41 arranged around the peripheral side of the connecting portion 32 .

[0139] The plurality of sealing rings 41 are respectively arranged corresponding to the plurality of electrode lead-out holes 12 and are used to seal the plurality of electrode lead-out holes 12. According to different actual needs, the different sealing rings 41 can be arranged separately from each other, or the different sealing rings 41 can also be arranged relatively fixedly. Among them, the contour shape, size and material composition of the different sealing rings 41 can remain the same or similar, or there can be differences. Optionally, the size shape corresponding to each sealing ring 41 can match the size shape of the corresponding electrode lead-out hole 12.

[0140] The sealing ring 41 can have a variety of structural forms. For example, the sealing ring 41 can be completely sandwiched between the first wall 11 and the terminal body 31, that is, the sealing ring 41 is completely located on the side of the first wall 11 away from the electrode assembly 20. Alternatively, the sealing ring 41 can also be partially sandwiched between the first wall 11 and the terminal body 31, and partially located in the electrode lead-out hole 12, and the part of the sealing ring 41 located in the electrode lead-out hole 12 can be used for positioning, thereby improving the relative position accuracy between the sealing ring 41 and the corresponding electrode lead-out hole 12.

[0141] In the embodiment of the present application, the sealing member 40 is provided with a plurality of sealing rings 41 corresponding to the plurality of electrode lead-out holes 12, so that the plurality of electrode lead-out holes 12 are individually sealed by means of the plurality of sealing rings 41. Compared with the technical solution in the related art in which the sealing member 40 includes only one sealing ring 41, this design helps to reduce the size corresponding to a single sealing ring 41, thereby reducing the risk of deformation failure of the sealing ring 41 and improving the sealing reliability of the battery cell 500.

[0142] In some embodiments, Figures 4 to 6 As shown, the sealing member 40 further includes a connecting member 42 for connecting different sealing rings 41 .

[0143] The connecting member 42 is used to connect different sealing rings 41 so that the different sealing rings 41 can be kept relatively fixed. Among them, the connecting member 42 can have various forms. For example, the connecting member 42 can be in a strip or block structure, and the connecting member 42 is completely located between adjacent sealing rings 41. In this way, both ends of the connecting member 42 can be connected to different sealing rings 41 to realize the fixation between different sealing rings 41, or the connecting member 42 can also be arranged to surround multiple sealing rings 41 at the same time.

[0144] There can be various connection forms between the connecting member 42 and the sealing ring 41. For example, the connecting member 42 and the sealing ring 41 can be made of the same material and be of an integral structure, or the connecting member 42 and the sealing ring 41 can be made of different materials and be connected and fixed by means such as bonding. Further, the dimensions of the partial structures of the connecting member 42 and the sealing ring 41 located between the terminal body 31 and the first wall 11 in the thickness direction X can be the same, or the dimensions of the partial structures of the connecting member 42 and the sealing ring 41 located between the terminal body 31 and the first wall 11 in the thickness direction X can also be different.

[0145] In the embodiment of the present application, by arranging the connecting member 42 in the seal 40, the relative fixation between different sealing rings 41 can be realized by means of the connecting member 42. Further, in the process of preparing the battery cell 500, multiple seals 40 can be assembled on the first wall 11 together, thereby improving the assembly efficiency.

[0146] In some embodiments, the sealing ring 41 and the connecting member 42 are integrally formed, that is, both of them are made of the same material and are formed together in the same process.

[0147] In the embodiment of the present application, by integrally forming the sealing ring 41 and the connecting member 42, the structural reliability between the sealing ring 41 and the connecting member 42 can be improved. And this can also cancel the welding process, reduce the adverse effects of the welding process on the sealing ring 41 and the connecting portion 32, and improve the structural reliability corresponding to the sealing ring 41 and the connecting member 42.

[0148] In some embodiments, as Figures 4 to 6 shown, the sealing ring 41 includes a first portion 411 on the side of the first wall 11 facing away from the electrode assembly 20, and the connecting member 42 is connected to different first portions 411. In the thickness direction X of the first wall 11, the dimension H2 of the connecting member 42 is smaller than the dimension H1 of the first portion 411.

[0149] As can be seen from the foregoing, the sealing ring 41 is a structure in the seal 40 for sealing the electrode lead-out hole 12, and the connecting member 42 is a structure in the seal 40 for relatively fixing different sealing rings 41. In other words, in the battery cell 500, the sealing ring 41 is used for sealing, while the connecting member 42 generally does not play a sealing role.

[0150] Further, the sealing ring 41 includes a first portion 411 located on the first wall 11 away from the electrode assembly 20. According to different actual needs, the sealing ring 41 may only include the first portion 411 located on one side of the first wall 11 away from the electrode assembly 20, or in addition to the first portion 411, the sealing ring 41 may further include a second portion located in the electrode lead-out hole 12, and the first portion 411 is connected to the second portion.

[0151] To improve the sealing reliability of the battery cell 500, within the battery cell 500, the first portion 411 needs to be squeezed by the terminal body 31 and the first wall 11 to generate a certain amount of compression. On this basis, if the dimension of the connecting member 42 in the thickness direction X is not less than the dimension of the first portion 411, the connecting member 42 will also be compressed together. In this case, the connecting member 42 will exert a certain force on the partial structure of the first wall 11 located between adjacent electrode lead-out holes 12, and the strength of the partial structure of the first wall 11 located between adjacent electrode lead-out holes 12 is generally low. Therefore, the force exerted by the connecting member 42 on the first wall 11 easily causes a risk of deformation of the first wall 11, which is not conducive to the normal use of the battery cell 500.

[0152] In the embodiment of the present application, by setting the dimension of the connecting member 42 in the thickness direction X to be smaller than the dimension of the first portion 411, in the battery cell 500, the first portion 411 can be compressed to improve the sealing reliability, while the connecting member 42 will not be compressed or the degree of compression is low, thereby reducing the magnitude of the force exerted by the connecting member 42 on the first wall 11 and reducing the risk of deformation of the partial structure of the first wall 11 located between adjacent electrode lead-out holes 12, and improving the reliability of the battery cell 500.

[0153] In some embodiments, please refer to Figures 4 to 8 , the first wall 11 includes a rib structure J located between adjacent electrode lead-out holes 12.

[0154] Due to the existence of the electrode lead-out holes 12, the local structure of the first wall 11 between adjacent electrode lead-out holes 12 usually has relatively low structural strength. To improve the anti-deformation ability of the first wall 11, in the embodiments of the present application, a rib structure J is provided between adjacent electrode lead-out holes 12, thereby improving the structural strength of the first wall 11 at the position between adjacent electrode lead-out holes 12, reducing the risk of excessive deformation of the first wall 11, and improving the reliability of the battery cell 500.

[0155] It should be noted that the rib structure J can have various structural forms. For example, the first wall 11 can include a wall body located between adjacent electrode lead-out holes 12, as Figure 5 and Figure 8 shown, the rib structure J can be located on the side of the wall body facing the electrode assembly 20, or as Figure 5 and Figure 7 shown, the rib structure J can also be located on the side of the wall body facing away from the electrode assembly 20. Further optionally, the rib structure J is located on the side of the wall body facing away from the electrode assembly 20, and the rib structure J is correspondingly arranged with the connecting member 42.

[0156] In some embodiments, as Figure 5 and Figure 6 shown, the first wall 11 includes a terminal mounting portion 13 and a boss structure 15 protruding from the side of the terminal mounting portion 13 facing away from the electrode assembly 20. The electrode lead-out hole 12 penetrates through the terminal mounting portion 13, and the boss structure 15 is disposed around the outer peripheral side of the electrode lead-out hole 12, and the boss structure 15 is snap-connected with the seal 40.

[0157] The terminal mounting portion 13 is a partial structure on the first wall 11 for mounting the electrode terminal 30. The electrode lead-out hole 12 and the boss structure 15 are both disposed on the terminal mounting portion 13. Among them, the boss structure 15 protrudes from the surface of the terminal mounting portion 13 facing away from the electrode assembly 20 and is disposed around the outer peripheral side of the electrode lead-out hole 12. Among them, the boss structure 15 is snap-connected with the seal 40 to realize the positioning of the seal 40 relative to the first wall 11.

[0158] Specifically, as Figure 6 shown, the boss structure 15 protrudes in the direction close to the sealing ring 41, and a groove structure 43 can be provided on the side of the sealing ring 41 facing the first wall 11. The boss structure 15 is at least partially located in the groove structure 43, so as to realize the snap-fit between the boss structure 15 and the seal 40.

[0159] In the embodiment of the present application, a boss structure 15 is provided on the first wall 11, and the boss structure 15 is snap-fitted with the seal 40, thereby improving the installation reliability between the seal 40 and the first wall 11. Moreover, the presence of the boss structure 15 can play a role in positioning and limiting the seal 40, improving the reliability of the relative position between the first wall 11 and the seal 40.

[0160] In some embodiments, referring to Figure 4 , Figure 5 and Figure 9 , the battery cell 500 further includes an insulating member 50, and the insulating member 50 is partially disposed around the circumferential side of the electrode terminal 30. In the thickness direction X of the first wall 11, the insulating member 50 is partially located between the first wall 11 and the electrode terminal 30 and connects the first wall 11 and the electrode terminal 30.

[0161] The insulating member 50 includes an insulating material and is used to insulate the first wall 11 from the electrode terminal 30. Specifically, the insulating member 50 is partially disposed around the circumferential side of the electrode terminal 30 to insulate and space the circumferential side structure of the electrode terminal 30 from the first wall 11. Further, in the embodiment of the present application, a partial structure of the insulating member 50 is also disposed between the first wall 11 and the electrode terminal 30 in the thickness direction X, which helps to further insulate the electrode terminal 30 from the first wall 11 and improve the reliability of the corresponding power transmission of the battery cell 500.

[0162] Further, in the embodiment of the present application, a partial structure of the insulating member 50 that is located between the first wall 11 and the electrode terminal 30 in the thickness direction X is configured to be connected to the first wall 11 and the electrode terminal 30, thereby providing a certain anti-deformation ability. Specifically, in combination with the foregoing content, a partial structure of the seal 40 that is located between the electrode terminal 30 and the first wall 11 in the thickness direction X and is used for sealing will be compressed and deformed after being applied to the battery cell 500, that is, the first part 411 will be compressed and deformed, and the first part 411 will also exert a certain reverse force on the first wall 11, and this reverse force causes the first wall 11 to tend to deform in the direction close to the electrode assembly 20. Since the insulating member 50 can be connected to the first wall 11 and the electrode terminal 30, when the first wall 11 deforms, the insulating member 50 can exert a certain force on the first wall 11 to hinder the deformation of the first wall 11, thereby providing a certain anti-deformation ability. Among them, the insulating member 50 can be connected and fixed to the first wall 11 by means of bonding and snap-fitting, etc.

[0163] In summary, in the embodiment of the present application, in addition to insulating the electrode terminal 30 from the first wall 11 to meet the insulation requirements of the electrode terminal 30, the insulating member 50 can also be connected to the first wall 11 so that the first wall 11 has a certain anti-deformation ability, thereby improving the overall structural reliability of the battery cell 500 and having strong practicality.

[0164] In some embodiments, Figure 9 As shown, the insulating member 50 includes a support portion 51, a first protrusion 52 protrudingly connected to the side of the support portion 51 away from the electrode assembly 20, and a second protrusion 53 protrudingly connected to the side of the support portion 51 toward the electrode assembly 20. The first protrusion 52 is plug-connected to the electrode terminal 30, and the second protrusion 53 is plug-connected to the first wall 11.

[0165] The support portion 51 is the main structure of the insulating part 50, and the first protrusion 52 and the second protrusion 53 are respectively protruded on different sides of the support portion 51 in the thickness direction X, wherein the first protrusion 52 and the second protrusion 53 can have a variety of connection methods relative to the support portion 51. Optionally, the first protrusion 52, the second protrusion 53 and the support portion 51 can include the same material and be formed together in the same process, that is, the first protrusion 52, the second protrusion 53 and the support portion 51 can be an integrally molded structure.

[0166] Further, the number of the first protrusion 52 may be one, or may be multiple. Optionally, the number of the first protrusion 52 is multiple, and the multiple first protrusions 52 are all protrudingly arranged on the side of the support portion 51 away from the electrode assembly 20, and the multiple first protrusions 52 are spaced apart from each other. The second protrusion 53 is the same, and the embodiment of the present application will not be repeated.

[0167] In the embodiment of the present application, the first protrusion 52 in the insulating member 50 can be plugged and connected to the electrode terminal 30, and the second protrusion 53 can be plugged and connected to the first wall 11. Compared with other connection methods, the plug-in connection method is simple to operate and can achieve the fixing of the insulating member 50 relative to the electrode terminal 30 and the first wall 11. Further, the first protrusion 52 and the second protrusion 53 are both fixed to the support part 51. When the first wall 11 is deformed, the support part 51 can provide a certain stress to the first wall 11, so that the first wall 11 has a certain anti-deformation ability, thereby improving the overall structural reliability of the battery cell 500.

[0168] In some embodiments, the electrode terminal 30 includes a terminal body 31 located on the side of the first wall 11 away from the electrode assembly 20. The terminal body 31 has a first surface M1 facing the electrode assembly 20 and a first recess 33 formed by inward depression from the first surface M1. In the direction from the electrode assembly 20 to the electrode terminal 30, the radial dimension of the first recess 33 gradually increases, and the first protrusion 52 is located within the first recess 33. And / or, the first wall 11 includes a terminal mounting portion 13. The terminal mounting portion 13 has a second surface M2 facing away from the electrode assembly 20, and an electrode lead-out hole 12 and a second recess 14 formed by inward depression from the second surface M2 and distributed in a staggered manner. In the direction from the electrode assembly 20 to the electrode terminal 30, the radial dimension of the second recess 14 gradually decreases, and the second protrusion 53 is located within the second recess 14.

[0169] The existence of the first recess 33 and the second recess 14 are respectively used to meet the connection requirements of the insulating member 50 with respect to the electrode terminal 30 and the first wall 11. Specifically, taking the example that the first recess 33 is provided on the electrode terminal 30, the first recess 33 is provided on the side of the terminal body 31 facing the support portion 51, and the first protrusion 52 can be embedded in the first recess 33 to achieve plug-in fixation between the electrode terminal 30 and the insulating member 50. Further, in the direction from the electrode assembly 20 to the electrode terminal 30, the radial dimension of the first recess 33 gradually increases, that is, the cross-sectional dimension of the first recess 33 gradually increases. In other words, the side wall corresponding to the first recess 33 is not parallel to the thickness direction X, but has a certain inclination angle relative to the thickness direction X.

[0170] On this basis, if due to external forces or other factors, the first protrusion 52 has a tendency to disengage from the first recess 33, since the side wall of the first recess 33 is inclined relative to the thickness direction X, the side wall of the first recess 33 can prevent the first protrusion 52 from disengaging from the first recess 33, thereby improving the position reliability between the insulating member 50 and the electrode terminal 30, and further improving the position reliability between the electrode terminal 30 and the first wall 11.

[0171] Similarly, taking the example that the second recess 14 is provided on the first wall 11, the first wall 11 is provided with a terminal mounting portion 13, and the terminal mounting portion 13 is a partial structure on the first wall 11 for mounting the electrode terminal 30. The second recess 14 is provided on the side of the terminal mounting portion 13 facing the support portion 51, and the second protrusion 53 can be embedded in the second recess 14 to achieve plug-in fixation between the first wall 11 and the insulating member 50. Further, in the direction from the electrode assembly 20 to the electrode terminal 30, the radial dimension of the second recess 14 gradually decreases, that is, the cross-sectional dimension of the second recess 14 gradually decreases. In other words, the side wall corresponding to the second recess 14 is not parallel to the thickness direction X, but has a certain inclination angle relative to the thickness direction X.

[0172] On this basis, if the second protrusion 53 has a tendency to separate from the second recess 14 due to external forces or other factors, since the side walls of the second recess 14 are inclined relative to the thickness direction X, the side walls of the second recess 14 can prevent the second protrusion 53 from separating from the second recess 14, thereby improving the position reliability between the insulating member 50 and the first wall 11, and further improving the position reliability between the electrode terminal 30 and the first wall 11.

[0173] In summary, in the embodiment of the present application, by providing at least one of the first recess 33 and the second recess 14, the connection reliability of the insulating member 50 relative to at least one of the first wall 11 and the electrode terminal 30 is improved, thereby improving the relative position reliability between the first wall 11 and the electrode terminal 30, thereby improving the corresponding anti-deformation ability of the first wall 11, which has strong practicality. Further optionally, the first recess 33 and the second recess 14 exist in the battery cell 500 at the same time.

[0174] In some embodiments, see Figure 10 The battery cell further includes a current collecting component 70 connected to the pole ear. The current collecting component 70 is provided with a connecting hole 71 . The electrode terminal 30 is partially located in the connecting hole 71 and is welded and fixed to the current collecting component 70 .

[0175] The current collecting member 70 is used to realize the electrical connection between the tab and the electrode terminal 30 in the battery cell, and further, the current collecting member 70 is provided with a connection hole 71, and the connection hole 71 is used to realize the welding fixation between the electrode terminal 30 and the current collecting member 70. Specifically, the electrode terminal 30 includes a terminal body 31 and a plurality of connection parts 32, the terminal body 31 is located on the side of the first wall 11 away from the electrode assembly 20, and at least part of the connection part 32 passes through the electrode lead-out hole 12 and penetrates into the space where the electrode assembly 20 is located, so as to be welded and fixed with the current collecting member 70 at the connection hole 71.

[0176] In the embodiment of the present application, by providing the connection holes 71 in the current collecting member 70, the relative positioning between the current collecting member 70 and the electrode terminal 30 can be achieved with the help of the connection holes 71, thereby improving the position reliability between the two. At the same time, this design can also reduce the distance between the current collecting member 70 and the first wall 11 in the thickness direction X, so that the partial structure of the current collecting member 70 located between adjacent connection holes 71 can support the first wall 11 to a certain extent, further improving the corresponding anti-deformation ability of the first wall 11.

[0177] It should be noted that there may be an insulating structure such as a lower plastic between the first wall 11 and the current collecting member 70 , wherein the current collecting member 70 may be disposed in contact with the lower plastic, or the two may be disposed at a distance.

[0178] In some embodiments, in the thickness direction X, the orthographic projection of the electrode lead-out hole 12 covers and extends beyond the orthographic projection of the connection hole 71. The distance between the inner wall surface of the electrode lead-out hole 12 and the inner wall surface of the connection hole 71 in the direction parallel to the first wall 11 is D, and D satisfies: 0 < D ≤ 3 mm. Optionally, D can be one of 0.1 mm, 0.5 mm, 1 mm, 2 mm, and 3 mm.

[0179] The connection hole 71 is provided so that the current collector member 70 and the electrode terminal 30 can be relatively fixed by butt welding. Butt welding refers to a method of connecting two mutually fitting metal parts by melting them at a certain temperature and pressure and then cooling and solidifying them. In order to reduce the adverse effect of the welding process on the first wall 11, a certain distance D needs to be provided between the inner wall surface of the electrode lead-out hole 12 and the inner wall surface of the connection hole 71, so as to improve the reliability of the structure of the first wall 11.

[0180] Furthermore, compared with penetration welding, the size of the heat-affected zone corresponding to the butt welding process is smaller. Therefore, the size corresponding to the distance D can be appropriately reduced so that D is not greater than 3 mm. Thereby reducing the distance B between adjacent different connection holes 71. Among them, the support strength of the part of the current collector member 70 located between adjacent connection holes 71 to the first wall 11 is often related to the distance A. Specifically, if the distance B is larger, it means that the size of the part of the current collector member 70 located between adjacent connection holes 71 in the direction parallel to the first wall 11 is larger, and thus this part of the structure is more likely to deform, and its support effect on the first wall 11 is worse.

[0181] Therefore, in the embodiments of the present application, by providing the connection hole 71 in the current collector member 70, the current collector member 70 and the electrode terminal 30 can be connected and fixed by butt welding, thereby reducing the adverse effect of the welding process on the first wall 11, reducing the size corresponding to the distance D, and further reducing the distance B between adjacent different connection holes 71, so as to improve the anti-deformation ability of the part of the current collector member 70 located between adjacent connection holes 71 and its support ability for the first wall 11, and improve the structural reliability of the first wall 11 during use.

[0182] In some embodiments, please refer to Figure 11 , the battery cell 500 further includes a current collector member 70, and the tab 21 is electrically connected to the electrode terminal 30 through the current collector member 70. The current collector member 70 includes a main body portion 72 and a plurality of protruding portions 73 protruding from the main body portion 72. The protruding portions 73 are at least partially located in the electrode lead-out hole 12 and are connected to the electrode terminal 30.

[0183] The current collecting member 70 is used to realize the electrical connection between the tab and the electrode terminal 30 in the battery cell, the main body 72 is the main component of the current collecting member 70, and the protrusion 73 is connected to the main body 72 and is used to penetrate into the electrode lead-out hole 12 to realize the connection with the electrode terminal 30. The number of the protrusions 73 may correspond to the number of the electrode lead-out holes 12, that is, a plurality of protrusions 73 respectively penetrate into a plurality of electrode lead-out holes 12 and are connected to the electrode terminal 30.

[0184] It should be noted that, due to the presence of the protrusion 73, the electrode terminal 30 can be completely located on the side of the first wall 11 away from the electrode assembly 20, that is, the electrode terminal 30 only includes the terminal body 31, and the protrusion 73 is connected to the terminal body 31. Alternatively, the electrode terminal 30 can also be partially located in the electrode lead-out hole 12, that is, the electrode terminal 30 includes both the terminal body 31 and the connecting portion 32, the connecting portion 32 is completely located in the electrode lead-out hole 12, and the protrusion 73 is connected to the connecting portion 32.

[0185] In the embodiment of the present application, a protrusion 73 is provided in the current collecting component 70, and the protrusion 73 is extended into the electrode lead-out hole 12 to achieve connection with the electrode terminal 30. This design makes it unnecessary for the electrode terminal 30 to enter the space where the electrode assembly 20 is located, thereby reducing the occupation of the internal space of the outer shell 10 by the electrode terminal 30 and improving the energy density of the battery cell.

[0186] In some embodiments, see Figure 12 The first wall 11 includes a third surface facing the electrode assembly 20 , and the electrode terminal 30 is partially disposed beyond the third surface M3 and connected to the electrode tab 21 .

[0187] In the embodiment of the present application, the electrode terminal 30 can enter the space where the electrode assembly 20 is located through the electrode lead-out hole 12, and the electrode terminal 30 can also be partially disposed beyond the third surface M3. On this basis, by directly connecting the electrode terminal 30 to the pole ear 21, the current collecting component is eliminated, thereby simplifying the structural layout in the battery cell.

[0188] In some embodiments, see Figure 13 The battery cell 500 further includes a current collecting member 70 connected to the electrode tab 21 , the first wall 11 includes a third surface M3 facing the electrode assembly 20 , and the electrode terminal 30 is partially disposed beyond the third surface M3 and connected to a surface of the current collecting member 70 facing the electrode terminal 30 .

[0189] In the embodiment of the present application, the electrode terminal 30 can enter the space where the electrode assembly 20 is located through the electrode lead-out hole 12, and the electrode terminal 30 can also be partially set beyond the third surface M3. On this basis, the electrode terminal 30 can be connected to the current collecting member 70 by penetration welding, and the electrical connection between the electrode terminal and the pole ear 21 is achieved by means of the current collecting member 70. In the second aspect, the embodiment of the present application provides a battery, the battery comprising a battery cell 500 in any of the aforementioned embodiments.

[0190] It should be noted that the battery provided in the embodiment of the present application has the beneficial effects of the battery cell 500 in any of the aforementioned embodiments. Please refer to the aforementioned description of the beneficial effects of the battery cell 500 for details, and the embodiment of the present application will not be repeated.

[0191] In a third aspect, an embodiment of the present application provides an electrical device, which includes a battery cell 500 in any of the aforementioned embodiments, and the battery cell 500 is used to provide electrical energy.

[0192] It should be noted that the electrical device provided in the embodiment of the present application has the beneficial effects of the battery cell 500 in any of the aforementioned embodiments. Please refer to the aforementioned description of the beneficial effects of the battery cell 500 for details, and the embodiment of the present application will not be repeated.

[0193] According to some embodiments of this application, please refer to Figures 4 to 9 The battery cell 500 includes a housing 10, an electrode assembly 20, an electrode terminal 30, a fixing member 60, an insulating member 50 and a sealing member 40. The housing 10 includes a first wall 11, and the first wall 11 is provided with a plurality of electrode lead-out holes 12. The electrode assembly 20 is disposed in the housing 10 and includes a tab 21. The electrode cell includes a terminal body 31 and a plurality of connecting portions 32. The terminal body 31 is located on a side of the first wall 11 away from the electrode assembly 20, and the connecting portions 32 are at least partially located in the electrode lead-out holes 12. The fixing member 60 is disposed around the circumference of the terminal body 31, and in the thickness direction X, the terminal body 31 is partially sandwiched between the fixing member 60 and the first wall 11, and the insulating member 50 is at least partially located between the fixing member 60 and the terminal body 31.

[0194] The sealing member 40 includes a plurality of sealing rings 41 disposed around the peripheral sides of the plurality of connecting portions 32, and a connecting member 42 connecting different sealing rings 41, and the sealing ring 41 and the connecting member 42 are integrally formed. The sealing ring 41 includes a first portion 411 located on the first wall 11 away from the electrode group, and the connecting member 42 is connected to different first portions 411, and in the thickness direction X, the size of the connecting member 42 is smaller than the size of the first portion 411.

[0195] The first wall 11 includes a reinforcing rib structure J located between adjacent electrode lead-out holes 12. In the thickness direction X, the insulating member 50 is partially located between the first wall 11 and the electrode terminal 30 and connects the first wall 11 and the electrode terminal 30. The insulating member 50 includes a support portion 51, a first protrusion 52 protrudingly connected to the side of the support portion 51 away from the electrode assembly 20, and a second protrusion 53 protrudingly connected to the side of the support portion 51 toward the electrode assembly 20. The first protrusion 52 is plugged and connected to the electrode terminal 30, and the second protrusion 53 is plugged and connected to the first wall 11.

[0196] The terminal body 31 has a first surface M1 facing the electrode assembly 20, and a first recess 33 formed by the first surface M1 being recessed inwardly. In the direction from the electrode assembly 20 to the electrode terminal 30, the cross-sectional size of the first recess 33 tends to increase gradually, and the first protrusion 52 is located in the first recess 33. The first wall 11 includes a terminal connection portion 32, the terminal connection portion 32 has a second surface M2 facing away from the electrode assembly 20, and an electrode lead-out hole 12 and a second recess 14 formed by the second surface M2 being recessed inwardly and staggered. In the direction from the electrode assembly 20 to the electrode terminal 30, the cross-sectional size of the second recess 14 tends to decrease gradually, and the second protrusion 53 is located in the second recess 14.

[0197] 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 replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: The housing comprises a first wall, wherein the first wall is provided with a plurality of electrode lead-out holes; An electrode assembly, disposed in the housing and comprising a tab; An electrode terminal, disposed on the first wall and electrically connected to the electrode tab, wherein in the thickness direction of the first wall, a single electrode terminal covers the plurality of electrode lead-out holes; as well as A sealing member, at least a portion of which is disposed between the first wall and the electrode terminal and seals the plurality of electrode lead-out holes.

2. The battery cell according to claim 1, characterized in that: The electrode terminal comprises a terminal body and a plurality of connection parts, the terminal body is located on a side of the first wall away from the electrode assembly, and at least a part of the connection part is located in the electrode lead-out hole; At least a portion of the seal is located between the terminal body and the first wall.

3. The battery cell according to claim 2, characterized in that: It also includes a fixing member and an insulating member, wherein the fixing member is arranged around the peripheral side of the terminal body, and in the thickness direction, the terminal body is partially sandwiched between the fixing member and the first wall; The insulating member is at least partially located between the fixing member and the terminal body.

4. The battery cell according to claim 2, characterized in that: The sealing member includes a plurality of sealing rings arranged around the peripheral sides of the plurality of connecting parts.

5. The battery cell according to claim 4, characterized in that: The sealing member also includes a connecting member for connecting different sealing rings.

6. The battery cell according to claim 5, characterized in that: The sealing ring and the connecting piece are integrally formed.

7. The battery cell according to claim 5, characterized in that: The sealing ring includes a first portion located on the first wall away from the electrode assembly, and the connecting member is connected to a different first portion; In a thickness direction of the first wall, a size of the connecting member is smaller than a size of the first portion.

8. The battery cell according to claim 2, characterized in that , the first wall includes a reinforcing rib structure located between adjacent electrode lead-out holes.

9. The battery cell according to claim 1, characterized in that: The first wall includes a terminal mounting portion and a boss structure protruding from the terminal mounting portion on a side away from the electrode assembly, the electrode lead-out hole penetrates the terminal mounting portion, and the boss structure surrounds the outer peripheral side of the electrode lead-out hole; The boss structure is clamped with the sealing member.

10. The battery cell according to claim 1, characterized in that: Also included is an insulating member, wherein the insulating member is partially disposed around the circumference of the electrode terminal; In the thickness direction of the first wall, a portion of the insulating member is located between the first wall and the electrode terminal and connects the first wall and the electrode terminal.

11. The battery cell according to claim 10, characterized in that: The insulating member includes a supporting portion, a first protruding portion protrudingly connected to a side of the supporting portion away from the electrode assembly, and a second protruding portion protrudingly connected to a side of the supporting portion toward the electrode assembly; The first protrusion is plug-connected to the electrode terminal, and the second protrusion is plug-connected to the first wall.

12. The battery cell according to claim 11, characterized in that: The electrode terminal comprises a terminal body located on a side of the first wall away from the electrode assembly, the terminal body having a first surface facing the electrode assembly and a first recessed portion formed by the first surface being recessed inwardly; In a direction from the electrode assembly to the electrode terminal, the radial dimension of the first recess gradually increases, and the first protrusion is located in the first recess; and / or, The first wall includes a terminal mounting portion, the terminal mounting portion having a second surface facing away from the electrode assembly and the electrode lead-out hole and the second recess formed by the second surface being recessed inward and staggeredly distributed; In a direction from the electrode assembly to the electrode terminal, a radial dimension of the second recess gradually decreases, and the second protrusion is located in the second recess.

13. The battery cell according to claim 1, characterized in that: Also includes a current collecting component connected to the pole lug; The current collecting member is provided with a connection hole, and the electrode terminal is partially located in the connection hole and is welded and fixed to the current collecting member.

14. The battery cell according to claim 13, characterized in that: In the thickness direction, the orthographic projection of the electrode lead-out hole covers and exceeds the orthographic projection of the connection hole; The distance between the inner wall surface of the electrode lead-out hole and the inner wall surface of the connection hole in a direction parallel to the first wall is D, and D satisfies: 0<D≤3mm.

15. The battery cell according to claim 1, characterized in that: Also includes a current collecting member, the electrode tab is electrically connected to the electrode terminal through the current collecting member; The current collecting member includes a main body and a plurality of protrusions protruding from the main body. The protrusions are at least partially located in the electrode lead-out holes and connected to the electrode terminals.

16. The battery cell according to claim 1, characterized in that: The first wall includes a third surface facing the electrode assembly, and the electrode terminal portion is disposed beyond the third surface and connected to the electrode tab.

17. The battery cell according to claim 1, characterized in that: Also includes a current collecting component connected to the pole lug; The first wall includes a third surface facing the electrode assembly, the electrode terminal portion protrudes from the third surface, and is connected to a surface of the current collecting member facing the electrode terminal.

18. A battery, characterized in that: Comprising the battery cell according to any one of claims 1 to 17.

19. An electrical device, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 17, wherein the battery cell is used to provide electrical energy.

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