CN223911834U

CN223911834U - Battery cells, battery packs and electrical devices

Info

Publication number: CN223911834U
Application number: CN202522474205.XU
Authority: CN
Inventors: 王湘; 莫彦波; 陈俊涛; 安立雄
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2025-11-21
Filing date: 2025-11-21
Publication date: 2026-02-13
Anticipated expiration: 2035-11-21

Abstract

The embodiment of the application provides a battery cell, a battery device and an electric device, wherein the battery cell comprises a shell, an electrode terminal and an insulating part, the shell comprises a first wall, the first wall is provided with an electrode leading-out hole, an accommodating cavity is formed in the shell, the electrode terminal is arranged on the first wall, the electrode terminal is opposite to the electrode leading-out hole, the insulating part is arranged on the first wall and surrounds the periphery of the electrode terminal, one of the insulating part and the electrode terminal is provided with a protruding structure, the other of the insulating part and the electrode terminal is provided with a groove structure, and at least part of the protruding structure is accommodated in the groove structure. According to the embodiment of the application, the service performance of the battery monomer can be improved.

Description

Battery cell, battery device and electricity utilization device

Technical Field

The application relates to the technical field of batteries, in particular to a battery cell, a battery device and an electric device.

Background

Energy conservation and emission reduction are key to sustainable development of the automobile industry, and electric vehicles become an important component of sustainable development of the automobile industry due to the energy conservation and environmental protection advantages of the electric vehicles. For electric vehicles, battery technology is an important factor in the development of the electric vehicles.

In the development of battery technology, in addition to improving the electrical performance of the battery device, structural stability and safety performance are also a non-negligible problem, and if the structural stability and safety performance of the battery cells in the battery device cannot be guaranteed, the battery device cannot be used normally, and the service performance of the battery device is reduced. Therefore, how to improve the service performance of the battery cell has become a technical problem to be solved in the art.

Disclosure of utility model

The embodiment of the application provides a battery cell, a battery device and an electricity utilization device, which can improve the service performance of the battery cell.

In a first aspect, the application provides a battery cell comprising a housing, an electrode terminal and an insulating part, wherein the housing comprises a first wall, an electrode outlet hole is formed in the first wall, a containing cavity is formed in the housing, the electrode terminal is arranged on the first wall and opposite to the electrode outlet hole, the insulating part is arranged on the first wall and surrounds the periphery of the electrode terminal, one of the insulating part and the electrode terminal is provided with a protruding structure, the other of the insulating part and the electrode terminal is provided with a groove structure, and at least part of the protruding structure is contained in the groove structure.

In the scheme of the embodiment of the application, when the electrode terminal is subjected to external torsion force or bending force, at least part of the protruding structure is accommodated in the groove structure, so that stress can be effectively dispersed to the whole structure, the deformation or fracture risk caused by local stress concentration is reduced, the integral structural stability of the electrode terminal is further improved, and secondly, the stable structural performance can be still kept when the electrode terminal is subjected to internal air pressure change of a battery cell through at least part of the protruding structure is accommodated in the groove structure, the short circuit risk caused by deformation of the electrode terminal is reduced, in addition, the sealing performance between the electrode terminal and the first wall can be improved, so that the risk of electrolyte leakage caused by mutual displacement between the insulating part and the electrode terminal under different use conditions is effectively reduced, and the service performance of the battery cell is improved.

In some embodiments, all of the projection arrangement is received in the recess arrangement.

In the scheme of the embodiment of the application, the whole protruding structure is arranged to be accommodated in the groove structure, so that the deformation or fracture risk caused by local stress concentration is further reduced, the overall structural stability of the electrode terminal is further improved, the stable structural performance can be kept when the electrode terminal is subjected to the internal air pressure change of the battery cell by accommodating the whole protruding structure in the groove structure, the short circuit risk caused by the deformation of the electrode terminal is reduced, and in addition, the sealing performance between the electrode terminal and the first wall is further improved by accommodating the whole protruding structure in the groove structure, so that the risk of electrolyte leakage caused by the mutual displacement between the insulating part and the electrode terminal is effectively reduced under different use conditions, and the service performance of the battery cell is improved.

In some embodiments, the insulating member includes a first portion disposed between the first wall and the electrode terminal, the first portion including a first surface facing the electrode terminal, the protrusion structure including a first protrusion extending from the first surface toward the electrode terminal, the groove structure including a first groove formed in the electrode terminal, at least a portion of the first protrusion being received in the first groove.

In the scheme of the embodiment of the application, the first protrusion is arranged on the first surface of the first part, the first groove is formed on the electrode terminal, and at least part of the first protrusion is accommodated in the first groove, so that the structural stability and the safety performance of the battery cell are both facilitated, the sealing performance of the battery cell is also both facilitated, and the service performance of the battery cell is improved.

In some embodiments, 1.2≤D2/D1≤4 is satisfied between a dimension D1 of the first groove and a dimension D2 between a first face and a second face of the electrode terminal in a thickness direction of the first wall, wherein the first face is a face of the electrode terminal on a side close to the accommodation chamber, and the second face is a face of the electrode terminal having a minimum distance from the first face in the thickness direction of the first wall.

In the scheme of the embodiment of the application, the ratio between the dimension D2 of the first groove and the dimension D1 between the first surface and the second surface of the electrode terminal is set within the range, so that on one hand, the risk of deformation or fracture caused by local stress concentration can be reduced, and further the structural stability of the whole electrode terminal is improved, and on the other hand, the rigidity of the electrode terminal can be improved, so that the risk of deformation of the electrode terminal is reduced, and the structural stability of the battery cell is further improved.

In some embodiments, the insulating member includes a second portion that is disposed over the electrode terminal, the second portion including a second surface that is perpendicular to the thickness direction of the first wall and that faces the electrode terminal, the protrusion structure including a second protrusion that extends from the second surface toward the electrode terminal, the groove structure including a second groove formed in the electrode terminal, at least a portion of the second protrusion receiving the second groove.

In the scheme of the embodiment of the application, the second protrusion is arranged on the second surface of the second part of the insulating part, the second groove is arranged on the electrode terminal, and at least part of the second protrusion is accommodated in the second groove, so that the structural stability and the safety performance of the battery cell are both facilitated, and the sealing performance of the battery cell is also facilitated, and the service performance of the battery cell is improved.

In some embodiments, the distance D3 between the first groove and the second groove and the dimension D2 between the first face and the second face of the electrode terminal in the thickness direction of the first wall satisfy 0.25≤D3/D2≤0.8.

In the scheme of the embodiment of the application, the ratio of the distance D3 between the first groove and the second groove to the dimension D2 between the first surface and the second surface of the electrode terminal is set within the range, so that on one hand, the risk of deformation or fracture caused by local stress concentration can be reduced, and further the structural stability of the whole electrode terminal is further improved, and on the other hand, the rigidity of the electrode terminal can be improved, so that the risk of deformation of the electrode terminal is reduced, and the structural stability of the battery cell is further improved.

In some embodiments, the insulating member includes a third portion overlapping the first wall, the third portion including a third surface facing the electrode terminal, the protrusion structure including a third protrusion extending from the third surface toward the electrode terminal, the groove structure including a third groove formed in the electrode terminal, at least a portion of the third protrusion being received in the third groove.

In the scheme of the embodiment of the application, the third protrusion is arranged on the third surface of the third part of the insulating part, the third groove is arranged on the electrode terminal, and at least part of the third protrusion is accommodated in the third groove, so that the structural stability and the safety performance of the battery cell are both facilitated, and the sealing performance of the battery cell is also facilitated, and the service performance of the battery cell is improved.

In some embodiments, the bottom wall of the insulating member extends toward the first wall to form a fourth protrusion, a surface of the first wall facing the side of the insulating member is formed with a fourth groove, and at least a portion of the fourth protrusion is accommodated in the fourth groove.

In the scheme of the embodiment of the application, the bottom wall of the insulating part extends towards the first wall to form the fourth bulge, the surface of the first wall facing one side of the insulating part is provided with the fourth groove, and at least part of the fourth bulge is accommodated in the fourth groove, so that the structural stability and the safety performance of the battery cell are both facilitated, and the sealing performance of the battery cell is also facilitated, and the service performance of the battery cell is improved.

In some embodiments, the insulating member includes a first portion disposed between the first wall and the electrode terminal, the first portion including a first surface facing the electrode terminal, the protrusion structure including a fifth protrusion extending from the electrode terminal toward the first surface, the groove structure including a fifth groove formed in the first surface, at least a portion of the fifth protrusion being received in the fifth groove.

In the scheme of the embodiment of the application, at least part of the fifth bulge is accommodated in the fifth groove, so that the structural stability and the safety performance of the battery cell are both facilitated, the sealing performance of the battery cell is also facilitated, and the service performance of the battery cell is improved.

In some embodiments, the number of the protruding structures is set to be plural, the number of the groove structures is set to be plural, and the plurality of protruding structures corresponds to the plurality of groove structures one to one.

In the scheme of the embodiment of the application, the number of the protruding structures is multiple, the number of the groove structures is multiple, the protruding structures are in one-to-one correspondence with the groove structures, stress can be effectively dispersed to the whole structure, the deformation or fracture risk caused by local stress concentration is reduced, the integral structural stability of the electrode terminal is further improved, the stable structural performance can be still maintained when the electrode terminal is subjected to the change of the internal air pressure of the battery cell, the short circuit risk caused by the deformation of the electrode terminal is reduced, in addition, the sealing performance between the electrode terminal and the first wall is improved, and the risk of electrolyte leakage caused by the mutual displacement between the insulating part and the electrode terminal is effectively reduced under different use conditions, so that the service performance of the battery cell is improved.

In a second aspect, a battery device is provided, including a plurality of battery cells, where the battery cells are the battery cells in the first aspect or the implementation manners thereof.

In a third aspect, there is provided an electrical consumer comprising a battery device as described in the second aspect for providing electrical energy to the electrical consumer.

In some implementations, the powered device may be a vehicle, a vessel, a spacecraft, or the like.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and other drawings may be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of a vehicle according to an embodiment of the present application.

Fig. 2 is a schematic structural diagram of a battery device according to an embodiment of the present application.

Fig. 3 is a schematic diagram illustrating an exploded structure of a battery cell according to an embodiment of the application.

Fig. 4 is a schematic diagram illustrating an exploded structure of a battery cell according to another embodiment of the present application.

Fig. 5 is a schematic view illustrating a part of a structure of a battery cell according to an embodiment of the application.

Fig. 6 is a schematic partial cross-sectional view of a battery cell according to an embodiment of the application.

Fig. 7 is a schematic partial cross-sectional view of a battery cell according to another embodiment of the application.

Fig. 8 is a schematic partial cross-sectional view of a battery cell according to another embodiment of the application.

Fig. 9 is a schematic partial cross-sectional view of a battery cell according to another embodiment of the application.

Fig. 10 is a schematic partial cross-sectional view of a battery cell according to another embodiment of the present application.

Fig. 11 is a schematic partial cross-sectional view of a battery cell according to another embodiment of the application.

Fig. 12 is a schematic partial cross-sectional view of a battery cell according to another embodiment of the application.

The reference numerals describe 1-vehicle, 10-battery device, 20-battery cell, 30-controller, 40-motor, 510-opening, 11-case, 111-first part, 112-second part, 112 a-bottom plate, 112 b-side plate, 21-case, 22-electrode assembly, 211-case, 212-end cap, 222-electrode tab, 222 a-positive tab, 222 b-negative tab, 213-pressure relief mechanism, 214-electrode terminal, 214 a-first electrode terminal, 214 b-second electrode terminal, 215-first wall, 216-electrode lead-out hole, 23-changeover part, 50-receiving cavity, 2143-fixing part, 60-insulating part, 61-first part, 62-second part, 63-third part, 610-first surface, 611-second surface, 612-third surface, 613-fourth surface, 70-groove structure, 710-first groove, 720-second groove, 730-third groove, 740-fourth groove, 760-fifth groove, 760-sixth groove, 80-third groove, 21480-third surface, and 21480-third surface.

In the drawings, the drawings are not drawn to scale.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs, the terms used in the description of this application in this application are for the purpose of describing particular embodiments only and are not intended to be limiting of the application, and the terms "comprising" and "having" and any variations thereof in the description of this application and the claims and the above description of the drawings are intended to cover non-exclusive inclusions. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the described embodiments of the application may be combined with other embodiments.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "attached" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, directly connected, indirectly connected through an intermediary, or may be in communication with the interior of two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

The term "and/or" in the present application is merely an association relation describing the association object, and indicates that three kinds of relations may exist, for example, a and/or B may indicate that a exists alone, while a and B exist together, and B exists alone. In the present application, the character "/" generally indicates that the front and rear related objects are an or relationship.

In the embodiments of the present application, the same reference numerals denote the same components, and detailed descriptions of the same components are omitted in different embodiments for the sake of brevity. It should be understood that the thickness, length, width, etc. dimensions of the various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length, width, etc. dimensions of the integrated device, are merely illustrative and should not be construed as limiting the application in any way.

The term "plurality" as used herein means two or more (including two), and similarly, "plural sets" means two or more (including two), and "plural sheets" means two or more (including two).

All embodiments of the application and alternative embodiments may be combined with each other to form new solutions, unless otherwise specified.

All technical features and optional technical features of the application may be combined with each other to form new technical solutions, unless specified otherwise.

In the embodiment of the application, the battery cell can be a secondary battery, and the secondary battery refers to a battery cell which can activate the active material in a charging mode to continue to use after the battery cell discharges. The battery device in the embodiment of the application may also be referred to as a battery.

The battery cell may be a lithium 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 hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited by the embodiment of the application.

The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge of the battery cell, active ions (e.g., lithium ions) are inserted 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, can play a role in preventing the positive electrode and the negative electrode from being short-circuited, and can enable active ions to pass through.

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

As an example, the positive electrode current collector has two surfaces opposing in its own thickness direction, and the positive electrode active material is provided on either or both of the two surfaces opposing the positive electrode current collector.

As an example, the positive electrode current collector may employ a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as the metal foil, a pure metal, an alloy, a surface-treated metal including, but not limited to, stainless steel, copper, aluminum, nickel, titanium, silver, or the like may be used. The composite current collector may include a polymeric material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel alloy, titanium alloy, silver alloy, etc.) on a polymer material substrate (e.g., a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

In some embodiments, the positive electrode may be a metal foam. The foam metal can be foam nickel, foam copper, foam aluminum, foam alloy, foam carbon or the like. When the metal foam is used as the positive electrode, the surface of the metal foam may not be provided with the positive electrode active material, but may be provided with the positive electrode active material. As an example, the positive electrode active material is filled or/and deposited within the metal foam.

In some embodiments, the negative electrode may be a negative electrode tab, which may include a negative electrode current collector.

As an example, the negative electrode current collector may employ a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as the metal foil, a pure metal, an alloy, a surface-treated metal including, but not limited to, stainless steel, copper, aluminum, nickel, titanium, silver, or the like may be used. The composite current collector may include a polymeric material base layer and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel alloy, titanium alloy, silver alloy, etc.) on a polymer material substrate (e.g., a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

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.

As an example, the anode current collector has two surfaces opposing in its own thickness direction, and the anode active material is provided on either or both of the two surfaces opposing the anode current collector.

As an example, a negative active material for a battery cell, which is well known in the art, may be used. As an example, the anode active material may include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based material, tin-based material, lithium titanate, and the like. The silicon-based material may be at least one selected from elemental silicon, silicon oxygen compounds, silicon carbon composites, silicon nitrogen composites, and silicon alloys. The tin-based material may be at least one selected from elemental tin, tin oxide, and tin alloys. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery cell negative electrode active material may be used. These negative electrode active materials may be used alone or in combination of two or more.

In some embodiments, the negative electrode may employ a metal foam. The foam metal can be foam nickel, foam copper, foam aluminum, foam alloy, foam carbon or the like. When the foam metal is used as the negative electrode sheet, the surface of the foam metal does not need to be provided with a negative electrode active material, and the surface of the foam metal can be provided with the negative electrode active material.

As an example, a negative electrode active material may be filled or/and deposited within the negative electrode current collector.

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

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

In some embodiments, the separator is a separator film. The type of the separator is not particularly limited, and any known porous separator having good chemical stability and mechanical stability can be used.

As an example, the main material of the separator may be at least one selected from glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator may be a single-layer film or a multilayer composite film, and is not particularly limited. When the separator is a multilayer composite film, the materials of the respective layers may be the same or different, and are not particularly limited. The separator may be a single member located between the positive and negative electrodes, or may be attached to the surfaces of the positive and negative electrodes. The surface of the isolating film may be coated with inorganic particle coating, organic particle coating or organic/inorganic composite coating.

In some embodiments, the separator is a solid state electrolyte. The solid electrolyte is arranged between the anode and the cathode and plays roles in transmitting ions and isolating the anode and the cathode.

In some embodiments, the battery cell further includes an electrolyte that serves to conduct ions between the positive and negative electrodes. The application is not particularly limited in the kind of electrolyte, and may be selected according to the need. The electrolyte may be liquid, gel or solid.

Wherein the liquid electrolyte comprises an electrolyte salt and a solvent.

In some embodiments, additives are optionally also included in the electrolyte. For example, the additives may include negative electrode film-forming additives, or may include positive electrode film-forming additives, or may include additives that improve certain properties of the cell, such as additives that improve cell overcharge/fast charge properties, additives that improve high temperature properties of the cell, additives that improve low temperature properties of the cell, and the like.

The gel electrolyte comprises a polymer serving as a skeleton network and can be used with ionic liquid-lithium salt.

Wherein the solid electrolyte comprises a polymer solid electrolyte, an inorganic solid electrolyte and a composite solid electrolyte.

As examples, the polymer of the polymer solid electrolyte may include polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, a polyion liquid, cellulose, and the like.

As an example, the inorganic solid electrolyte may be one or more of an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), a sulfide solid electrolyte (crystalline lithium super ion conductor (lithium germanium phosphorus sulfide, silver sulfur germanium mine), amorphous sulfide), and a halide solid electrolyte, a nitride solid electrolyte, and a hydride solid electrolyte.

As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

The electrode assembly can be a winding structure, a lamination structure or a mixed structure of winding and lamination.

In some embodiments, the electrode assembly is a rolled structure. The positive plate and the negative plate are wound into a winding structure.

In some embodiments, the electrode assembly is a lamination stack.

As an example, a plurality of positive electrode sheets and negative electrode sheets may be provided, respectively, and a plurality of positive electrode sheets and a plurality of negative electrode sheets may be alternately stacked.

As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheets are folded to form a plurality of folded sections arranged in a stacked manner, with one positive electrode sheet sandwiched between adjacent folded sections.

As an example, the positive and negative electrode sheets are each folded to form a plurality of folded sections in a stacked arrangement.

As an example, the separator may be provided in plurality, respectively between any adjacent positive electrode sheet or negative electrode sheet.

As an example, the separator may be continuously provided, being disposed between any adjacent positive or negative electrode sheets by folding or winding.

In some embodiments, the electrode assembly may have a cylindrical shape, a flat shape, a polygonal column shape, or the like.

In some embodiments, the electrode assembly is provided with tabs that can conduct current away from the electrode assembly. The tab includes a positive tab and a negative tab.

In some embodiments, the battery cell may include a housing. The shell 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), an aluminum-plastic film or the like. In some embodiments, the housing may be a sealed structure or a non-sealed structure. As an example, when the case is of a non-sealing structure, the case plays a role in protecting the electrode assembly, and a sealing pouch for sealing the electrode assembly and the electrolyte is further included between the case and the electrode assembly. In particular, the sealed bag may be a bag-like insulating member or an aluminum plastic film. When the casing is of a sealing structure, the casing is used for packaging the electrode assembly, electrolyte and other components.

As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or other shaped battery cell, and the prismatic battery cell includes a square-case battery cell, a blade-shaped battery cell, a polygonal-prismatic battery cell, such as a hexagonal-prismatic battery cell, etc., and the present application is not particularly limited.

In some embodiments, at least one electrode terminal is provided on the housing, the electrode terminal being electrically connected to the tab. The electrode terminal may be directly connected to the tab, or may be indirectly connected to the tab through the current collecting member. The electrode terminal may be provided on the terminal cover or may be provided on the case.

In some embodiments, a pressure relief mechanism is provided on the housing. The pressure release mechanism is used for exhausting the internal gas of the battery cell.

As an example, the internal pressure or temperature of the battery cell is actuated to release the internal pressure or temperature when the internal pressure or temperature reaches a predetermined threshold. When the internal pressure or temperature of the battery cell reaches a preset threshold value, the pressure release mechanism performs an action or a weak structure arranged in the pressure release mechanism is destroyed, so that an opening or a channel for releasing the internal pressure or temperature is formed. The threshold design varies according to design requirements. The threshold may depend on the material of one or more of the positive electrode sheet, the negative electrode sheet, the electrolyte, and the separator in the battery cell.

As an example, the pressure relief mechanism may be integrally formed with the housing.

As an example, the pressure relief mechanism may also be provided separately from and connected to the housing.

The term "actuated" as used herein refers to the pressure relief mechanism being actuated or activated to a state such that the internal pressure and temperature of the battery cells are relieved. The action by the pressure relief mechanism may include, but is not limited to, movement of a component in the pressure relief mechanism to form a vent passage, at least a portion of the pressure relief mechanism breaking, being torn or opened, etc. When the pressure release mechanism is actuated, high-temperature and high-pressure substances inside the battery cell are discharged outwards from the actuated position as emissions. In this way, the pressure and temperature of the battery cell can be relieved under the condition of controllable pressure or temperature, so that the occurrence of a potential serious accident is avoided.

In some embodiments, when the housing is in a non-sealing structure, the pressure release mechanism may be provided as a through hole for exhausting gas inside the battery cell.

References to emissions from the battery cell in the present application include, but are not limited to, electrolytes, dissolved or split positive and negative electrode sheets, fragments of separators, high temperature and pressure gases generated by the reaction, flames, and the like.

The battery device according to embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells connected in series, parallel, or series-parallel by a bus member.

In some embodiments, the battery cell assembly is generally formed from a plurality of battery cells arranged.

As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by binding a plurality of battery cells by a tie.

In some embodiments, the battery device may be a battery pack including a case and one or more battery cell assemblies housed in the case.

As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the case in such a manner that the battery module is fixed in the case.

As an example, the battery cell assembly may be accommodated in the case by directly fixing a plurality of battery cells to the case.

As an example, the case may include a first case and a second case. The first box body and the second box body are buckled, so that a closed space is formed inside the box body to accommodate the battery cell assembly. The closing means covering or closing, and can be sealing or unsealing. The first housing may be a top cover or a bottom plate.

As an example, the case may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected with the frame, so that a closed space is formed inside the box body to accommodate the battery cell assembly.

In some embodiments, the tank may be part of the chassis structure of the vehicle. For example, a portion of the tank may become at least a portion of the floor of the vehicle, or a portion of the tank may become at least a portion of the cross member and the side member of the vehicle.

The technical scheme described in the embodiment of the application is applicable to various electric devices using battery monomers, such as mobile phones, portable equipment, notebook computers, battery cars, electric toys, electric tools, vehicles, ships, spacecraft and the like, and for example, the spacecraft comprises planes, rockets, spaceships, spacecraft and the like.

The battery device in the embodiments of the present application may also be referred to as an energy storage device, which includes one or more battery clusters to boost the voltage and capacity of the energy storage device. The battery cluster may include a plurality of battery devices connected in series through a bus member to increase the voltage of the energy storage device. When the energy storage device comprises a plurality of battery clusters, the battery clusters are connected in parallel to improve the capacity of the energy storage device.

Energy conservation and emission reduction are key to sustainable development of the automobile industry, and electric vehicles become an important component of sustainable development of the automobile industry due to the energy conservation and environmental protection advantages of the electric vehicles. In addition to improving the electrical performance of battery devices, structural stability and safety performance are also a non-negligible problem in the development of battery technology. For example, an insulating member is generally provided between the electrode terminal and the first wall of the battery cell for fixing the electrode terminal, and the electrode terminal is required to be subjected to continuous mechanical stress during use, which easily causes bending deformation or even breakage of the electrode terminal. The deformation not only can cause the connection looseness inside the battery cell and increase the contact resistance, but also can cause serious safety problems such as short circuit, liquid leakage and the like. Therefore, how to improve the service performance of the battery cell has become a technical problem to be solved in the art.

The embodiment of the application provides a battery cell, a battery device and an electric device, wherein the battery cell comprises a shell, an electrode terminal and an insulating part, the shell comprises a first wall, the first wall is provided with an electrode leading-out hole, an accommodating cavity is formed in the shell, the electrode terminal is arranged on the first wall, the electrode terminal is opposite to the electrode leading-out hole, the insulating part is arranged on the first wall and surrounds the periphery of the electrode terminal, one of the insulating part and the electrode terminal is provided with a protruding structure, the other of the insulating part and the electrode terminal is provided with a groove structure, and at least part of the protruding structure is accommodated in the groove structure. In the scheme of the embodiment of the application, when the electrode terminal is subjected to external torsion force or bending force, at least part of the protruding structure is accommodated in the groove structure, so that stress can be effectively dispersed to the whole structure, the deformation or fracture risk caused by local stress concentration is reduced, the integral structural stability of the electrode terminal is further improved, and secondly, the stable structural performance can be still kept when the electrode terminal is subjected to internal air pressure change of a battery cell through at least part of the protruding structure is accommodated in the groove structure, the short circuit risk caused by deformation of the electrode terminal is reduced, in addition, the sealing performance between the electrode terminal and the first wall can be improved, so that the risk of electrolyte leakage caused by mutual displacement between the insulating part and the electrode terminal under different use conditions is effectively reduced, and the service performance of the battery cell is improved.

The technical scheme described by the embodiment of the application is suitable for various power utilization devices using battery devices.

The electric device may be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool, or the like. The vehicle may be a fuel oil vehicle, a gas vehicle or a new energy vehicle, the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle, etc., the spacecraft includes an airplane, a rocket, a space plane, a spacecraft, etc., the electric toy includes a fixed or movable electric toy such as a game machine, an electric vehicle toy, an electric ship toy, an electric plane toy, etc., and the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool, and a railway electric tool such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator, an electric planer, etc. The embodiment of the application does not limit the electric device in particular.

It should be understood that the technical solutions described in the embodiments of the present application are not limited to the above-described electric devices, but may be applied to all devices using batteries, and the following embodiments are described in detail with reference to electric devices as vehicles for brevity.

For example, as shown in fig. 1, a schematic structural diagram of a vehicle 1 according to an embodiment of the present application is shown, where the vehicle 1 may be a fuel-oil vehicle, a gas-fired vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle. The motor 40, the controller 30 and the battery device 10 may be provided in the vehicle 1, and the controller 30 is configured to control the battery device 10 to supply power to the motor 40. For example, the battery device 10 may be provided at the bottom or the head or the tail of the vehicle 1. The battery device 10 may be used for power supply of the vehicle 1, for example, the battery device 10 may be used as an operating power source of the vehicle 1, for the circuitry of the vehicle 1, for example, for the start-up, navigation and operational power requirements of the vehicle 1. In another embodiment of the present application, the battery device 10 may not only serve as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, instead of or in part instead of fuel oil or natural gas, to supply driving power to the vehicle 1.

To meet different power requirements, the battery device 10 according to the embodiment of the present application may include at least one battery cell assembly, where the battery cell assembly includes a plurality of battery cells, and the plurality of battery cells may be electrically connected in series or parallel or in series-parallel to form the battery device 10, where series-parallel refers to a mixture of series and parallel. The battery device 10 may also be referred to as a battery pack. For example, a plurality of battery cells may be first assembled into a battery module by series connection or parallel connection or series-parallel connection, and then assembled into the battery device 10 by series connection or parallel connection or series-parallel connection. That is, a plurality of battery cells may be directly assembled into the battery device 10, or the battery module may be assembled first and then assembled into the battery device 10.

For example, as shown in fig. 2, the battery device 10 may include a plurality of battery cells 20, which is a schematic structural view of the battery device 10 according to an embodiment of the present application. The battery device 10 may further include a case 11 (or called a cover), in which the case 11 has a hollow structure, and a plurality of battery cells 20 are accommodated in the case 11. For example, a plurality of battery cells 20 are connected in parallel or in series-parallel combination with each other and then placed in the case 11.

As shown in fig. 2, the housing 11 may include two portions, referred to herein as a first portion 111 and a second portion 112, respectively, with the first portion 111 and the second portion 112 snap-fit together. The shape of the first and second members 111 and 112 may be determined according to the shape of the combination of the plurality of battery cells 20, and each of the first and second members 111 and 112 may have one opening. For example, each of the first member 111 and the second member 112 may be a hollow rectangular parallelepiped and each have only one surface as an opening surface, the opening of the first member 111 and the opening of the second member 112 are disposed opposite to each other, and the first member 111 and the second member 112 are fastened to each other to form the case 11 having a closed chamber. The case may include a bottom plate 112a, side plates 112b, and beams, among others. The plurality of battery cells 20 are connected in parallel or in series-parallel combination and then placed in the box 11 formed by buckling the first component 111 and the second component 112.

Alternatively, the battery device 10 may further include other structures, which are not described in detail herein. For example, the battery device 10 may further include a bus member for making electrical connection between the plurality of battery cells 20, such as parallel or series-parallel connection. Specifically, the bus member may realize electrical connection between the battery cells 20 by connecting electrode terminals of the battery cells 20. Further, the bus member may be fixed to the electrode terminals of the battery cells 20 by welding. The electrical energy of the plurality of battery cells 20 may be further drawn through the housing by a conductive mechanism. Alternatively, the conductive means may also belong to the bus bar member.

The number of battery cells 20 may be set to any number according to different power requirements. The plurality of battery cells 20 may be connected in series, parallel, or series-parallel to achieve a larger capacity or power. Since the number of battery cells 20 included in each battery device 10 may be large, the battery cells 20 may be arranged in groups for easy installation, and each group of battery cells 20 constitutes a battery module. The number of battery cells 20 included in the battery module is not limited, and may be set according to requirements.

In the embodiment of the present application, the number of the battery cells 20 may be set to any value according to different power requirements. The plurality of battery cells 20 may be connected in series, parallel, or series-parallel to achieve a larger capacity or power. Since the number of battery cells 20 included in each battery device 10 may be large, the battery cells 20 may be arranged in groups for easy installation, and each group of battery cells 20 constitutes a battery module. The number of battery cells 20 included in the battery module is not limited, and may be set according to requirements. The battery device 10 may include a plurality of battery modules that may be connected in series, parallel, or series-parallel.

Fig. 3 is a schematic diagram illustrating an exploded structure of a battery cell 20 according to an embodiment of the present application, and fig. 4 is a schematic diagram illustrating an exploded structure of a battery cell 20 according to another embodiment of the present application. As shown in fig. 3 and 4, the battery cell 20 of the embodiment of the present application may include a case 21 and an electrode assembly 22, the case 21 having a closed receiving chamber 50, the electrode assembly 22 being disposed in the receiving chamber 50 within the case 21. The housing 21 may include a housing 211 having a hollow structure with at least one opening 510 and an end cap 212 for snap-fitting with the housing 211 to form the housing 21 with a closed receiving cavity 50.

In some embodiments, the end cap 212 may be a plate-like structure for covering the opening 510 of the housing 211. In other embodiments, the end cap 212 is similar in structure to the housing 211, i.e., the housing 211 and the end cap 212 are hollow structures having one opening 510, and the two openings 510 are butted to form the housing 21 having a closed receiving space.

It should be understood that if the end cap 212 has a plate-like structure, the housing 211 may have a hollow structure with one or more ends forming the opening 510, for example, if the housing 211 has a hollow structure with one end forming the opening 510, the end cap 212 may be provided as one, and if the housing 211 has a hollow structure with two opposite ends forming the opening 510, the end caps 212 may be provided as two, and the two end caps 212 respectively cover the openings 510 at the two ends of the housing 211.

The housing 21 may be of various shapes, such as a cylinder, a cuboid, or other polyhedron. As shown in fig. 3 and 4, in the embodiment of the present application, the case 21 is mainly described as an example of a rectangular parallelepiped structure.

It should be appreciated that the end cap 212 of the present embodiment is configured to cooperate with the housing 211 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the end cap 212 may be adapted to the shape of the housing 211, and as shown in fig. 3 and 4, the housing 211 has a rectangular parallelepiped structure, and the end cap 212 has a rectangular plate-like structure adapted to the housing 211.

The material of the housing 211 according to the embodiment of the present application may include one or more materials, for example, copper, iron, aluminum, steel, aluminum alloy, etc. The material of the end cap 212 may also be one or more, and may include copper, iron, aluminum, steel, aluminum alloy, etc., for example. The material of the end cap 212 may be the same as or different from the material of the housing 211, and the material of the different walls of the housing 211 may be the same or different.

The end cap 212 of the embodiment of the present application may be any wall of the housing 21, for example, the end cap 212 may be a wall with the largest area, or a wall with the smallest area, or may be other walls, where the embodiment of the present application is not limited thereto. Alternatively, the end cap 212 may have other structures, for example, the end cap 212 may be a groove with an opening, so that the opening of the end cap 212 covers the opening 510 of the housing 211, which is not limited thereto.

It should be appreciated that the battery cell 20 also includes an electrode terminal 214. The electrode terminal 214 of the embodiment of the present application is used to electrically connect with the electrode assembly 22 inside the battery cell 20 to output the electric power of the battery cell 20. As shown in fig. 3 to 4, the battery cell 20 may include at least two electrode terminals 214, and the at least two electrode terminals 214 may include at least one first electrode terminal 214a and at least one second electrode terminal 214b, and the first electrode terminal 214a is for electrically connecting with the positive electrode tab 222a of the electrode assembly 22 in case that the first electrode terminal 214a is a positive electrode terminal and the second electrode terminal 214b is for electrically connecting with the negative electrode tab 222b of the electrode assembly 22 in case that the second electrode terminal 214b is a negative electrode terminal, for example. The first electrode terminal 214a and the positive electrode tab 222a may be directly connected or indirectly connected, and the second electrode terminal 214b and the negative electrode tab 222b may be directly connected or indirectly connected. Illustratively, the first electrode terminal 214a may be electrically connected to the positive tab 222a through one of the switching members 23, and the second electrode terminal 214b may be electrically connected to the negative tab 222b through one of the switching members 23. It should be understood that in the embodiment of the present application, the positive tab 222a and the negative tab 222b may be collectively referred to as the electrode tab 222.

In the embodiment of the present application, the wall of the case 211 and the wall of the end cap 212 are both referred to as the wall of the battery cell 20, wherein for the rectangular parallelepiped type battery cell 20 shown in fig. 3 and 4, the wall of the case 211 includes a bottom wall and four side walls. The case 211 is determined according to the shape of the combined one or more electrode assemblies 22, for example, the case 211 may be a hollow rectangular parallelepiped or square or cylindrical body, and one face of the case 211 has an opening so that one or more electrode assemblies 22 may be placed in the case 211. For example, when the housing 211 is a hollow rectangular parallelepiped or square, one of the planes of the housing 211 is an opening surface, i.e., the plane has no wall body so that the inside and outside of the housing 211 communicate. When the housing 211 may be a hollow cylinder, the end surface of the housing 211 is an open surface, i.e., the end surface has no wall body so that the inside and outside of the housing 211 communicate. End cap 212 covers the opening and is connected to housing 211 to form a closed cavity in which electrode assembly 22 is placed. The housing 211 is filled with an electrolyte, such as an electrolyte solution.

In the battery cell 20, the electrode assembly 22 is a component of the battery cell 20 in which an electrochemical reaction occurs, and the electrode assembly 22 in the case 211 may be provided in one or more cases according to actual use requirements. For example, as shown in fig. 4, 2 electrode assemblies 22 are provided in the battery cell 20. The electrode assembly 22 may have a cylindrical shape, a rectangular parallelepiped shape, or the like, and if the electrode assembly 22 has a cylindrical structure, the case 211 may have a cylindrical structure, and if the electrode assembly 22 has a rectangular parallelepiped structure, the case 211 may have a rectangular parallelepiped structure.

In the battery cell 20, the electrode assembly 22 is a component of the battery cell 20 in which an electrochemical reaction occurs, and the electrode assembly 22 in the case 211 may be provided in one or more cases according to actual use requirements. For example, as shown in fig. 4, 2 electrode assemblies 22 are provided in the battery cell 20. The electrode assembly 22 may have a cylindrical shape, a rectangular parallelepiped shape, or the like, and if the electrode assembly 22 has a cylindrical structure, the case 211 may have a cylindrical structure, and if the electrode assembly 22 has a rectangular parallelepiped structure, the case 211 may have a rectangular parallelepiped structure. In an embodiment of the present application, the material of the housing 211 may include copper, iron, aluminum, steel, aluminum alloy, etc.

A pressure release mechanism 213 may also be provided on the battery cell 20. The pressure release mechanism 213 is used to actuate to release the internal pressure or temperature of the battery cell 20 when the internal pressure or temperature reaches a threshold.

The pressure relief mechanism 213 may be a variety of possible pressure relief mechanisms 213. For example, the pressure relief mechanism 213 may be a temperature-sensitive pressure relief mechanism configured to melt when the internal temperature of the battery cell 20 provided with the pressure relief mechanism 213 reaches a threshold value, and/or the pressure relief mechanism 213 may be a pressure-sensitive pressure relief mechanism configured to rupture when the internal air pressure of the battery cell 20 provided with the pressure relief mechanism 213 reaches a threshold value.

Fig. 5 is a schematic view showing a part of the structure of a battery cell 20 according to an embodiment of the application. Fig. 6 shows a schematic partial cross-sectional view of a battery cell 20 according to an embodiment of the application.

In some implementations, as shown in fig. 3 to 6, the battery cell 20 includes a case 21, an electrode terminal 214, and an insulating member 60, wherein the case 21 includes a first wall 215, the first wall 215 is provided with an electrode lead-out hole 216, a receiving chamber 50 is formed inside the case 21, the electrode terminal 214 is provided to the first wall 215, the electrode terminal 214 is provided opposite to the electrode lead-out hole 216, the insulating member 60 is provided to the first wall 215 and surrounds an outer circumference of the electrode terminal 214, wherein one of the insulating member 60 and the electrode terminal 214 is provided with a protrusion structure 80, the other of the insulating member 60 and the electrode terminal 214 is provided with a groove structure 70, and at least a portion of the protrusion structure 80 is received in the groove structure 70.

It should be understood that the case 21 in the embodiment of the present application includes a housing 211 and an end cap 212, and the first wall 215 in the embodiment of the present application may be formed on the housing 211 or the end cap 212, that is, the wall of the housing 211 is provided with an electrode lead-out hole 216 penetrating the housing 211 in the thickness direction of the housing 211, or the end cap 212 is provided with an electrode lead-out hole 216 penetrating the end cap 212 in the thickness direction of the end cap 212, for example. It should also be understood that the receiving chamber 50 formed inside the case 21 may be used to receive the electrode assembly 22.

It is also understood that the shape of the electrode lead-out hole 216 in the embodiment of the present application may be provided in a matching manner according to the shape of the electrode terminal 214, and the shape of the electrode lead-out hole 216 in a plane perpendicular to the thickness direction of the case 21 may be provided in a circular shape as shown in fig. 5, for example.

It should also be understood that the arrangement of the electrode terminal 214 opposite to the electrode lead-out hole 216 in the embodiment of the present application may mean that the orthographic projection of the electrode terminal 214 covers the orthographic projection of the electrode lead-out hole 216 on a plane perpendicular to the thickness direction of the case 21.

The insulating member 60, which may also be referred to as an upper plastic, is used to fix the electrode terminal 214 to the first wall 215, and in particular, the insulating member 60 (such as epoxy) may flow and fill all minute gaps and irregularities between the electrode terminal 214 and the mounting hole of the first wall 215 when in a liquid state, and forms a uniform and non-porous sealing layer after curing, which may be used for sealing and insulating, and in addition, the insulating member 60 may uniformly transfer load to the entire connection interface in case that the first wall 215 and the electrode terminal 214 thereon are subjected to a great mechanical stress, thereby reducing local stress concentration and reducing the risk of occurrence of micro cracks caused by spot welding or mechanical clamping.

In some embodiments, the side of one of the insulating member 60 and the electrode terminal 214 facing the electrode terminal 214 is provided with the protrusion structure 80, and the side of the other electrode terminal 214 of the insulating member 60 and the electrode terminal 214 facing the protrusion structure 80 is provided with the groove structure 70, which may include the following possible implementation manners:

In one possible implementation, the side of the insulating member 60 facing the electrode terminal 214 is provided with a protrusion structure 80, and the side of the electrode terminal 214 facing the protrusion structure 80 is provided with a groove structure 70.

In another possible implementation, the side of the electrode terminal 214 facing the insulating member 60 is provided with a protrusion structure 80, and the side of the insulating member 60 facing the protrusion structure 80 is provided with a groove structure 70.

In some embodiments, the insulating member 60 and the bump structure 80 may be integrally formed, or the insulating member 60 and the bump structure 80 may be welded or otherwise connected, which is not limited in this regard.

In some embodiments, the raised structures 80 may be a continuous rectangle, or alternatively, spaced apart rectangles, in the plane of the thickness of the first wall 215. Alternatively, the protrusion structure 80 may be one complete ring provided around the electrode terminal 214 in a thickness direction perpendicular to the first wall 215, or may be a ring provided with a partition in between.

Correspondingly, the groove structure 70 may be a continuous rectangle or a rectangle spaced apart on the plane of the thickness direction of the first wall 215. Alternatively, the groove structure 70 may be a complete ring or may be a ring with interruptions disposed therebetween in a direction perpendicular to the thickness of the first wall 215.

Alternatively, where the groove structure 70 is a discontinuous ring, i.e., multiple segments ultimately form a ring-shaped groove structure 70, wherein the spacing between the segments may be greater than half the diameter of the groove structure 70.

It should be understood that the spacing between each of the multiple segments may also be different, as the application is not limited in any way.

In some embodiments, at least a portion of the protrusion structure 80 being received in the recess structure 70 means that the recess structure 70 matingly engages or snaps into engagement with the protrusion structure 80 for securement.

Alternatively, it should also be understood that, as shown in fig. 6, the battery cell 20 in the embodiment of the present application further includes a fixing portion 2143, which may also be referred to as a welding ring, the fixing portion 2143 being spaced apart from the electrode terminal 214 by the insulating member 60, and the fixing portion 2143 being connected to the insulating member 60 and the first wall 215, respectively, and the fixing portion 2143 may be provided in a conductive structure. Specifically, the electrode terminal 214, the insulating member 60, the fixing portion 2143, and the first wall 215 are connected in this order to achieve fixed connection of the electrode terminal 214 to the first wall 215.

In the solution of the embodiment of the present application, when the electrode terminal 214 is subjected to external torsion or bending force, at least part of the protruding structure 80 is accommodated in the groove structure 70, so that stress can be effectively dispersed to the whole structure, the risk of deformation or fracture caused by local stress concentration is reduced, and further the structural stability of the whole electrode terminal 214 is improved, secondly, at least part of the protruding structure 80 is accommodated in the groove structure 70, the stable structural performance can be maintained when the electrode terminal 214 is subjected to internal air pressure change of the battery cell 20, the risk of short circuit caused by deformation of the electrode terminal 214 is reduced, and in addition, the sealing performance between the electrode terminal 214 and the first wall 215 can be improved, so that the risk of electrolyte leakage caused by mutual displacement between the insulating member 60 and the electrode terminal 214 is effectively reduced under different use conditions, thereby improving the service performance of the battery cell 20.

Fig. 7 is a schematic partial cross-sectional view of a battery cell 20 according to another embodiment of the present application.

Optionally, according to some embodiments of the application, as shown in fig. 7, all of the raised structures 80 are received in the recessed structures 70.

It should be appreciated that, in the case where the entire protrusion structure 80 is received in the groove structure 70, the surface of the protrusion structure 80 facing the side of the groove structure 70 may be attached to or fixedly connected with the inner surface of the groove structure 70, and the space utilization rate of the battery cell 20 and the overall energy density may be improved by the entire protrusion structure 80 being received in the groove structure 70.

In the solution of the embodiment of the present application, the risk of deformation or fracture caused by local stress concentration is further reduced by arranging the whole of the protrusion structure 80 to be accommodated in the groove structure 70, so that the overall structural stability of the electrode terminal 214 is further improved, and secondly, the stable structural performance can be maintained when the electrode terminal 214 is subjected to the internal air pressure change of the battery cell 20 by accommodating the whole of the protrusion structure 80 in the groove structure 70, so that the risk of short circuit caused by the deformation of the electrode terminal 214 is reduced, and in addition, the sealing performance between the electrode terminal 214 and the first wall 215 is further improved by accommodating the whole of the protrusion structure 80 in the groove structure 70, so that the risk of electrolyte leakage caused by the mutual displacement between the insulating member 60 and the electrode terminal 214 is effectively reduced under different use conditions, so that the service performance of the battery cell 20 is improved.

Optionally, as shown in fig. 7, according to some embodiments of the present application, the insulating member 60 includes a first portion 61 disposed between the first wall 215 and the electrode terminal 214, the first portion 61 includes a first surface 610 facing the electrode terminal 214, the protrusion structure 80 includes a first protrusion 810 extending from the first surface 610 toward the electrode terminal 214, the groove structure 70 includes a first groove 710 formed in the electrode terminal 214, and at least a portion of the first protrusion 810 is received in the first groove 710.

In some embodiments, the electrode terminal 214 may be tapered in a stepped shape in a thickness direction of the first wall 215 and away from the receiving chamber 50, and the insulating member 60 between a side of the electrode terminal 214 facing the receiving chamber 50 and the first wall 215 may be referred to as the first portion 61.

The first groove 710 is a groove formed in the surface of the electrode terminal 214 facing the receiving chamber 50 in the thickness direction of the first wall 215.

Alternatively, the number of the first grooves 710 may be one or more, and the number of the corresponding first protrusions 810 may be one or more, and the number of the first grooves 710 may be the same as the number of the first grooves 710.

In the solution of the embodiment of the present application, by providing the first protrusion 810 on the first surface 610 of the first portion 61 and forming the first groove 710 on the electrode terminal 214, at least a portion of the first protrusion 810 is received in the first groove 710, so as to achieve both structural stability and safety performance of the battery cell 20 and sealing performance of the battery cell 20, thereby improving the service performance of the battery cell 20.

According to some embodiments of the present application, alternatively, as shown in FIG. 7, a dimension D1 of the first groove 710 and a dimension D2 between the first face 2140 and the second face 2141 of the electrode terminal 214 in the thickness direction of the first wall 215 satisfy 1.2≤D2/D1≤4, wherein the first face 2140 is a surface of the electrode terminal 214 on a side close to the accommodating chamber 50, and the second face 2141 is a surface of the electrode terminal 214 having the smallest distance from the first face 2140 in the thickness direction of the first wall 215.

In some embodiments, the electrode terminal 214 may be tapered in a step shape along the thickness direction of the first wall 215 and away from the receiving chamber 50, and the dimension D2 between the first face 2140 and the second face 2141 of the electrode terminal 214 may also refer to the thickness of the first step of the electrode terminal 214 closest to the receiving chamber 50.

It should be understood that the dimension D1 of the first groove 710 in the embodiment of the present application in the thickness direction perpendicular to the first wall 215 may refer to the maximum dimension, the minimum dimension, or the average dimension of the first groove 710 in the thickness direction perpendicular to the first wall 215. The dimension D2 between the first face 2140 and the second face 2141 of the electrode terminal 214 in the embodiment of the present application may refer to a maximum dimension, a minimum dimension, or an average dimension of the first face 2140 and the second face 2141 of the electrode terminal 214 in a thickness direction perpendicular to the first wall 215.

Illustratively, the ratio D2/D1 between the dimension D1 of the first groove 710 and the dimension D2 between the first face 2140 and the second face 2141 of the electrode terminal 214 in the thickness direction of the first wall 215 may be set to be 1.2, 1.6, 2, 2.4, 2.8, 3.2, 3.6, 4, etc., or a value thereof within a range obtained by combining any two values described above.

Alternatively, it is possible to continue reference to 7, and the dimension D1 of the first groove 710 and the dimension D4 between the first face 2140 and the third face 2142 of the electrode terminal 214 in the thickness direction of the first wall 215 satisfy that 3≤D4/D1≤10, wherein the first face 2140 is the surface of the electrode terminal 214 on the side close to the accommodation chamber 50 and the third face 2142 is the face of the electrode terminal 214 that is the largest distance from the first face 2140 in the thickness direction of the first wall 215.

In some embodiments, the electrode terminal 214 may be tapered in a step shape along the thickness direction of the first wall 215 and away from the receiving chamber 50, and the dimension D4 between the first face 2140 and the third face 2142 of the electrode terminal 214 may also refer to the thickness of the step of the electrode terminal 214 furthest from the receiving chamber 50.

Illustratively, the ratio D4/D1 between the dimension D1 of the first recess 710 and the dimension D4 between the first face 2140 and the third face 2142 of the electrode terminal 214 in the thickness direction of the first wall 215 may be set to 3, 4, 5, 6, 7, 8, 9, 10, etc., or a value thereof within a range obtained by combining any two values described above.

In the embodiment of the present application, the ratio between the dimension D1 of the first groove 710 and the dimension D2 between the first face 2140 and the second face 2141 of the electrode terminal 214 is set within the range, so that, on one hand, the risk of deformation or fracture caused by local stress concentration can be reduced, and further, the structural stability of the whole electrode terminal 214 is further improved, and on the other hand, the rigidity of the electrode terminal 214 can be improved, so that the risk of deformation of the electrode terminal 214 is reduced, and the structural stability of the battery cell 20 is further improved.

Fig. 8 is a schematic partial cross-sectional view of a battery cell 20 according to another embodiment of the present application. Fig. 9 is a schematic partial cross-sectional view of a battery cell 20 according to another embodiment of the present application.

Optionally, as shown in fig. 8, according to some embodiments of the present application, the insulating member 60 includes a second portion 62 that is mounted on the electrode terminal 214, the second portion 62 includes a second surface 611 perpendicular to the thickness direction of the first wall 215 and facing the electrode terminal 214, the protrusion structure 80 includes a second protrusion 820 that extends from the second surface 611 toward the electrode terminal 214, the groove structure 70 includes a second groove 720 formed in the electrode terminal 214, and at least a portion of the second protrusion 820 is received in the second groove 720.

In some embodiments, the electrode terminal 214 may be tapered in a step shape along the thickness direction of the first wall 215 and away from the receiving chamber 50, and a portion of the insulating member 60 that is disposed on the step closest to the side of the receiving chamber 50 is referred to as a second portion 62.

It should be appreciated that the second protrusion 820 may be partially received in the second recess 720 or may be fully received in the second recess 720.

Alternatively, as shown in fig. 9, the second portion 62 includes a fourth surface 613 parallel to the thickness direction of the first wall 215 and facing the electrode terminal 214, the protrusion structure 80 includes a sixth protrusion 860 extending from the fourth surface 613 toward the electrode terminal 214, the groove structure 70 includes a sixth groove 760 formed in the electrode terminal 214, and at least a part of the sixth protrusion 860 is received in the sixth groove 760.

It should be appreciated that the second recess 720 is similar to the first recess 710, and the second protrusion 820 is similar to the first protrusion 810, and the present application will not be described herein.

In the solution of the embodiment of the present application, the second protrusion 820 is disposed on the second surface 611 of the second portion 62 of the insulating member 60, and the second groove 720 is disposed on the electrode terminal 214, so that at least a portion of the second protrusion 820 is received in the second groove 720, thereby improving the service performance of the battery cell 20 while simultaneously considering the structural stability and the safety performance of the battery cell 20.

According to some embodiments of the present application, optionally, as shown in FIG. 8, a distance D3 between the first groove 710 and the second groove 720 and a dimension D2 between the first face 2140 and the second face 2141 of the electrode terminal 214 in a thickness direction of the first wall 215 satisfy 0.25≤D3/D2≤0.8.

It is understood that the distance D3 between the first groove 710 and the second groove 720 in the embodiment of the present application may refer to the maximum size, the minimum size, or the average size of the distance between the first groove 710 and the second groove 720 in the thickness direction perpendicular to the first wall 215.

Illustratively, the ratio D3/D2 between the distance D3 between the first and second grooves 710, 720 and the dimension D2 between the first and second faces 2140, 2141 of the electrode terminal 214 may be set to be 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, etc., or values thereof in the range obtained by combining any two values described above, in the thickness direction of the first wall 215.

Alternatively, the interval between the first groove 710 and the second groove 720 in the thickness direction perpendicular to the first wall 215 may be greater than 0.5 times the size of the first groove 710 or the second groove 720 in the thickness direction perpendicular to the first wall 215. At this time, the interval between the first groove 710 and the second groove 720 in the thickness direction of the first wall 215 may be greater than 0, or may be set such that the interval between the first groove 710 and the second groove 720 in the thickness direction of the first wall 215 is greater than 0.5 times the size of the first groove 710 or the second groove 720 in the thickness direction perpendicular to the first wall 215.

In the embodiment of the present application, by setting the ratio between the distance D3 between the first and second grooves 710 and 720 and the dimension D2 between the first and second faces 2140 and 2141 of the electrode terminal 214 within this range, on one hand, the risk of deformation or breakage due to local stress concentration can be reduced, and thus the structural stability of the electrode terminal 214 as a whole can be further improved, and on the other hand, the rigidity of the electrode terminal 214 can be improved, so that the risk of deformation of the electrode terminal 214 can be reduced, and thus the structural stability of the battery cell 20 can be further improved.

Fig. 10 is a schematic partial cross-sectional view of a battery cell 20 according to another embodiment of the present application.

Optionally, as shown in fig. 10, according to some embodiments of the present application, the insulating member 60 includes a third portion 63 overlapping the first wall 215, the third portion 63 includes a third surface 612 facing the electrode terminal 214, the protrusion structure 80 includes a third protrusion 830 extending from the third surface 612 toward the electrode terminal 214, the groove structure 70 includes a third groove 730 formed in the electrode terminal 214, and at least a portion of the third protrusion 830 is accommodated in the third groove 730.

In some embodiments, the protrusion structure 80 includes a third protrusion 830 that extends the third surface 612 toward the electrode terminal 214, meaning that the third protrusion 830 is obtained by extending the third portion 63 in a thickness direction perpendicular to the first wall 215.

Alternatively, in the case where the first groove 710 and the third groove 730 are simultaneously present, the orthographic projections of the first groove 710 and the third groove 730 do not coincide on a plane perpendicular to the thickness direction of the first wall 215 to improve the strength of the electrode terminal 214.

Alternatively, in the case where the second groove 720 and the third groove 730 are present at the same time, the orthographic projections of the second groove 720 and the third groove 730 do not coincide on a plane parallel to the thickness direction of the first wall 215 to improve the strength of the electrode terminal 214.

In the solution of the embodiment of the present application, the third protrusion 830 is disposed on the third surface 612 of the third portion 63 of the insulating member 60, and the third groove 730 is disposed on the electrode terminal 214, so that at least a portion of the third protrusion 830 is received in the third groove 730, thereby improving the service performance of the battery cell 20 while considering the structural stability and the safety performance of the battery cell 20.

Fig. 11 is a schematic partial cross-sectional view of a battery cell 20 according to another embodiment of the present application.

Optionally, as shown in fig. 11, the bottom wall 231 of the insulating member 60 extends toward the first wall 215 to form a fourth protrusion 840, a surface of the first wall 215 facing the insulating member 60 is formed with a fourth groove 740, and at least a part of the fourth protrusion 840 is accommodated in the fourth groove 740.

The bottom wall 231 of the insulating member 60 extends toward the first wall 215 to form a fourth protrusion 840, which means that the insulating member 60 is closest to a face of the accommodating chamber 50 in the thickness direction of the first wall 215, which face extends toward the first wall 215 to form the fourth protrusion 840.

In some embodiments, the fourth grooves 740 and the first grooves 710 may be spaced apart in a direction perpendicular to the thickness of the first wall 215, or, in other words, the orthographic projection of the fourth grooves 740 and the orthographic projection of the first grooves 710 may not coincide in a direction perpendicular to the thickness of the first wall 215. Or in a direction perpendicular to the thickness of the first wall 215, the orthographic projection of the fourth groove 740 and the orthographic projection of the first groove 710 may at least partially coincide.

In the solution of the embodiment of the present application, the fourth groove 740 is formed on the surface of the first wall 215 facing the insulating member 60, the fourth protrusion 840 is formed on the bottom wall 231 of the insulating member 60, and a portion of the fourth protrusion 840 is received in the fourth groove 740, so that the structural stability and the safety performance of the battery cell 20 are both facilitated, and the sealing performance of the battery cell 20 is also compromised, thereby improving the service performance of the battery cell 20.

In the above embodiments, the example in which the insulating member 60 is provided with the protrusion structure 80 and the electrode terminal 214 is provided with the recess structure 70 is taken as an example, and it is understood that the position in the above embodiments in which the insulating member 60 is provided with the protrusion structure 80 is provided with the recess structure 70, and correspondingly, the position in which the electrode terminal 214 is provided with the recess structure 70 is provided with the protrusion structure 80, which is also within the scope of the present application.

Fig. 12 is a schematic partial cross-sectional view of a battery cell 20 according to another embodiment of the present application.

Optionally, as shown in fig. 12, according to some embodiments of the present application, the insulating member 60 includes a first portion 61 disposed between the first wall 215 and the electrode terminal 214, the first portion 61 includes a first surface 610 facing the electrode terminal 214, the protrusion structure 80 includes a fifth protrusion 850 extending toward the first surface 610 from the electrode terminal 214, the groove structure 70 includes a fifth groove 750 formed in the first surface 610, and at least a portion of the fifth protrusion 850 is received in the fifth groove 750.

It should be appreciated that the fifth recess 750 is similar to the shape of the first recess 710, and the fifth protrusion 850 is similar to the shape of the first protrusion 810, and the present application will not be described herein.

In the solution of the embodiment of the present application, at least a portion of the fifth protrusion 850 is accommodated in the fifth groove 750, so that the structural stability and the safety performance of the battery cell 20 are both considered, and the sealing performance of the battery cell 20 is also considered, thereby improving the service performance of the battery cell 20.

According to some embodiments of the present application, the number of the protrusion structures 80 is optionally set to be plural, the number of the recess structures 70 is set to be plural, and the plural protrusion structures 80 are in one-to-one correspondence with the plural recess structures 70.

It should be understood that the number of the protruding structures 80 and the recessed structures 70 in the embodiment of the present application may be set according to actual requirements. Illustratively, there may be two protrusion structures 80, and correspondingly, two groove structures 70, with two protrusion structures 80 being disposed in one-to-one correspondence with two groove structures 70.

In the solution of the embodiment of the present application, the number of the protrusion structures 80 is set to be plural, the number of the groove structures 70 is set to be plural, and the plural protrusion structures 80 and the plural groove structures 70 are in one-to-one correspondence, so that stress can be effectively dispersed to the whole structure, the risk of deformation or fracture caused by local stress concentration is reduced, and further the structural stability of the whole electrode terminal 214 is improved, secondly, stable structural performance can be maintained when the electrode terminal 214 is subjected to the change of the internal air pressure of the battery cell 20, and the risk of short circuit caused by the deformation of the electrode terminal 214 is reduced, and furthermore, the sealing performance between the electrode terminal 214 and the first wall 215 can be improved, so that the risk of electrolyte leakage caused by the mutual displacement between the insulating member 60 and the electrode terminal 214 is effectively reduced under different use conditions, thereby improving the service performance of the battery cell 20.

According to some embodiments of the present application, there is further provided a battery device including a plurality of battery cells 20, wherein the battery cells 20 may be the battery cells 20 in any of the above embodiments.

According to some embodiments of the present application, there is further provided an electrical device including the battery device 10 of any of the above embodiments, where the battery device 10 is configured to provide electrical energy to the electrical device. Specifically, the electric device may be the vehicle 1 shown in fig. 1, or any electric device using the battery device 10.

The powered device may be any of the devices or systems described above that employ the battery device 10.

According to some embodiments of the present application, referring to fig. 3 to 12, the present application provides a battery cell 20, the battery cell 20 comprising a case 21, an electrode terminal 214, and an insulating member 60, wherein the case 21 comprises a first wall 215, the first wall 215 is provided with an electrode lead-out hole 216, a receiving chamber 50 is formed inside the case 21, the electrode terminal 214 is provided at the first wall 215, the electrode terminal 214 is disposed opposite to the electrode lead-out hole 216, the insulating member 60 is disposed at the first wall 215 and surrounds the outer circumference of the electrode terminal 214, wherein one of the insulating member 60 and the electrode terminal 214 is provided with a protrusion structure 80, the other of the insulating member 60 and the electrode terminal 214 is provided with a groove structure 70, and at least a part of the protrusion structure 80 is received in the groove structure 70. The entirety of the projection arrangement 80 is received in the recess arrangement 70. The insulating member 60 includes a first portion 61 disposed between the first wall 215 and the electrode terminal 214, the first portion 61 includes a first surface 610 facing the electrode terminal 214, the protrusion structure 80 includes a first protrusion 810 extending from the first surface 610 toward the electrode terminal 214, the groove structure 70 includes a first groove 710 formed in the electrode terminal 214, and at least a portion of the first protrusion 810 is received in the first groove 710. Along the thickness direction of the first wall 215, the dimension D2 of the first groove 710 and the dimension D1 between the first surface 2140 and the second surface 2141 of the electrode terminal 214 satisfy 1.2≤d2/d1≤4, wherein the first surface 2140 is a surface of the electrode terminal 214 on the side close to the accommodating cavity 50, and the second surface 2141 is a surface of the electrode terminal 214 having the smallest distance from the first surface 2140 in the thickness direction of the first wall 215.

It should be noted that the above embodiments are only used to illustrate the technical solution of the present application, but not to limit the technical solution of the present application, and although the detailed description of the present application is given with reference to the above embodiments, it should be understood by those skilled in the art that the technical solution described in the above embodiments may be modified or some or all technical features may be equivalently replaced, and these modifications or substitutions do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present application, and all the modifications or substitutions are included in the scope of the claims and the specification of the present application. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that it comprises:

The outer shell (21) includes a first wall (215), the first wall (215) is provided with an electrode lead-out hole (216), and the inner part of the outer shell (21) forms a receiving cavity (50);

An electrode terminal (214) is disposed on the first wall (215), and the electrode terminal (214) is disposed opposite to the electrode lead-out hole (216);

An insulating component (60) is disposed on the first wall (215) and surrounds the outer periphery of the electrode terminal (214);

One of the insulating component (60) and the electrode terminal (214) is provided with a protrusion structure (80), and the other of the insulating component (60) and the electrode terminal (214) is provided with a groove structure (70), with at least a portion of the protrusion structure (80) being accommodated in the groove structure (70).

2. The battery cell according to claim 1, wherein the entire protrusion structure (80) is accommodated within the groove structure (70).

3. The battery cell according to claim 1, wherein the insulating component (60) includes a first portion (61) disposed between the first wall (215) and the electrode terminal (214), the first portion (61) including a first surface (610) facing the electrode terminal (214).

The protrusion structure (80) includes a first protrusion (810) extending from the first surface (610) toward the electrode terminal (214), and the groove structure (70) includes a first groove (710) formed in the electrode terminal (214), with at least a portion of the first protrusion (810) being received in the first groove (710).

4. The battery cell according to claim 3, characterized in that, along the thickness direction of the first wall (215), the dimension D1 of the first groove (710) and the dimension D2 between the first surface (2140) and the second surface (2141) of the electrode terminal (214) satisfy: 1.2≤D2/D1≤4;

Wherein, the first surface (2140) is the surface of the electrode terminal (214) near the receiving cavity (50), and the second surface (2141) is the surface of the electrode terminal (214) that is the closest to the first surface (2140) in the thickness direction of the first wall (215).

5. The battery cell according to claim 3, wherein the insulating component (60) includes a second portion (62) disposed on the electrode terminal (214), the second portion (62) including a second surface (611) perpendicular to the thickness direction of the first wall (215) and facing the electrode terminal (214).

The protrusion structure (80) includes a second protrusion (820) extending from the second surface (611) toward the electrode terminal (214), and the groove structure (70) includes a second groove (720) formed on the electrode terminal (214), with at least a portion of the second protrusion (820) being received in the second groove (720).

6. The battery cell according to claim 5, characterized in that, along the thickness direction of the first wall (215), the distance D3 between the first groove (710) and the second groove (720) satisfies the following relationship with the dimension D2 between the first surface (2140) and the second surface (2141) of the electrode terminal (214): 0.25≤D3/D2≤0.8.

7. The battery cell according to claim 3, wherein the insulating component (60) includes a third portion (63) attached to the first wall (215), the third portion (63) including a third surface (612) facing the electrode terminal (214).

The protrusion structure (80) includes a third protrusion (830) extending from the third surface (612) toward the electrode terminal (214), and the groove structure (70) includes a third groove (730) formed in the electrode terminal (214), with at least a portion of the third protrusion (830) being received in the third groove (730).

8. The battery cell according to any one of claims 1 to 7, characterized in that the bottom wall (231) of the insulating member (60) extends toward the first wall (215) to form a fourth protrusion (840), and a fourth groove (740) is formed on the surface of the first wall (215) toward the insulating member (60), and at least a portion of the fourth protrusion (840) is accommodated in the fourth groove (740).

9. The battery cell according to any one of claims 1 to 7, characterized in that the insulating member (60) includes a first portion (61) disposed between the first wall (215) and the electrode terminal (214), the first portion (61) including a first surface (610) facing the electrode terminal (214).

The protrusion structure (80) includes a fifth protrusion (850) extending from the electrode terminal (214) toward the first surface (610), and the groove structure (70) includes a fifth groove (750) formed on the first surface (610), with at least a portion of the fifth protrusion (850) accommodated in the fifth groove (750).

10. The battery cell according to any one of claims 1 to 7, characterized in that the number of the protrusion structures (80) is set to a plurality, the number of the groove structures (70) is set to a plurality, and the plurality of protrusion structures (80) corresponds one-to-one with the plurality of groove structures (70).

11. A battery device, characterized in that it comprises:

Multiple battery cells, wherein the battery cells are as described in any one of claims 1 to 10.

12. An electrical device, characterized in that it comprises: a battery device as described in claim 11, wherein the battery device is used to provide electrical energy to the electrical device.