CN223757577U

CN223757577U - Battery monomer, cover plate assembly, battery device and electricity utilization device

Info

Publication number: CN223757577U
Application number: CN202520249919.8U
Authority: CN
Inventors: 谢勇锋; 程启; 周文林; 蔡祥虎; 郑于炼
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2025-02-17
Filing date: 2025-02-17
Publication date: 2026-01-02
Anticipated expiration: 2035-02-17

Abstract

This application provides a battery cell, a cover plate assembly, a battery device, and an electrical device, belonging to the field of battery technology. The battery cell includes: a casing, an electrode assembly, and electrode terminals; the electrode assembly is installed inside the casing and includes tabs; the electrode terminals are disposed in the casing and include a main body, an extension, and a reinforcing portion. The main body is connected to the tabs, the extension is connected to the main body, and the reinforcing portion is at least partially disposed on the side of the extension facing the casing. This application can reduce the deformation risk of the extension, thereby improving the bending and shear strength of the extension, thus reducing the risk of deformation or breakage of the electrode terminal extension under external pressure or vibration, and improving the overall reliability and safety of the battery cell.

Description

Battery monomer, cover plate assembly, battery device and electricity utilization device

Technical Field

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

Background

The battery cell includes an electrode terminal for connection with a tab of the electrode assembly and an electrode assembly, and in the related art, the electrode terminal is easily deformed or broken when being subjected to external pressure or vibration, resulting in poor reliability of the battery cell, which requires improvement.

Disclosure of utility model

The application provides a battery cell, a cover plate assembly, a battery device and an electric device, which are used for reducing the risk of deformation or fracture of an electrode terminal when bearing external pressure or vibration, and improving the overall reliability and safety of the battery cell.

In a first aspect, an embodiment of the present application provides a battery cell, including:

A housing including a wall portion;

an electrode assembly mounted in the case, the electrode assembly including a tab;

electrode terminal, set up in the shell, electrode terminal includes main part, extension and enhancement portion, main part electricity connect in the utmost point ear, the extension is followed the first direction protrusion main part, the first direction with the thickness direction of wall portion is perpendicular, the extension with main part links to each other and the electricity is connected in the busbar, the enhancement portion at least part set up in the extension is towards one side of wall portion.

In the above technical scheme, the deformation risk of the extension part can be reduced by arranging the reinforcing part on the inner side of the extension part, so that the bending strength and the shear strength of the extension part are improved, the risk that the extension part of the electrode terminal is deformed or broken when bearing external pressure or vibration is reduced, and the overall reliability and the safety of the battery cell are improved.

In some embodiments, the two electrode terminals include a first electrode terminal and a second electrode terminal that are arranged in an insulating manner, the main body portion, the extension portion, and the reinforcement portion of the first electrode terminal are a first main body portion, a first extension portion, and a first reinforcement portion, the main body portion, the extension portion, and the reinforcement portion of the second electrode terminal are a second main body portion, a second extension portion, and a second reinforcement portion, respectively, the first main body portion and the second main body portion are arranged in a first direction, the first extension portion and the second extension portion are arranged in a second direction, the first direction is perpendicular to the second direction, the first reinforcement portion is disposed between the first extension portion and the wall portion, and the second reinforcement portion is disposed between the second extension portion and the wall portion.

In some embodiments, the first electrode terminal further includes a first protrusion extending at least partially to a side of the second extension facing away from the housing, the second reinforcement at least partially coinciding with a projection of the first protrusion in a third direction perpendicular to the first and second directions, and/or,

The second electrode terminal further comprises a second protruding portion, the second protruding portion at least partially extends to one side, away from the shell, of the first extending portion, the first reinforcing portion and at least part of projection of the second protruding portion along the third direction are overlapped, and the third direction is perpendicular to the first direction and the second direction in pairs.

In some embodiments, a side of the first body portion facing the second extension portion is connected to the first projection portion, and a side of the second body portion facing the first extension portion is connected to the second projection portion.

In some embodiments, the battery cell further includes an insulating member at least partially disposed between the first electrode terminal, the second electrode terminal, and the housing.

In some embodiments, the insulator is at least partially disposed to the housing.

In some embodiments, the insulator comprises:

An insulating plate to which the first electrode terminal and the second electrode terminal are mounted at a spacing, and which is at least partially disposed between the first reinforcement portion and the case and between the second reinforcement portion and the case;

and a separator connected to the insulating plate and disposed between the first electrode terminal and the second electrode terminal.

In some embodiments, the spacer includes a first section, a second section, and a third section connected in sequence, the first section being located between the first body portion and the second extension, the second section being located between the first extension and the second extension, and the third section being located between the first extension and the second body portion.

In some embodiments, the projections of the first projection, the first segment, and the second extension in a third direction at least partially coincide, a portion of the first segment being sandwiched between the first projection and the second extension;

The projections of the first extension part, the third section and the second protruding part along the third direction are at least partially overlapped, and the part of the third section is clamped between the first extension part and the second protruding part.

In some embodiments, the length of the first projection in the second direction is less than the length of the first segment in the second direction, and the length of the second projection in the second direction is less than the length of the third segment in the second direction.

In some embodiments, the spacer includes first and second spacers distributed along a third direction, the first spacers having a height along the third direction that is not greater than the first and second electrode terminals, and the second spacers having a height along the third direction that is greater than the first and second electrode terminals.

In some embodiments, the second section of the second spacer has at least one detent for mating with a buss piece.

In some embodiments, the second section of the first spacer has at least one first stop that cooperates with the first extension and the second extension to define a degree of freedom of the first extension and the second extension in a third direction.

In some embodiments, the battery cell further includes a fixing member at least partially disposed on a side of the first electrode terminal and the second electrode terminal facing away from the case, and the fixing member is connected with the case.

In some embodiments, the battery cell includes an insulating member at least partially disposed between the electrode terminal and the fixing member.

In some embodiments, the insulator is at least partially disposed on an outer periphery of the mount.

In some embodiments, the first electrode terminal further includes a first adapter connected to the first body portion and the tab, respectively, the first reinforcement portion is overlapped with at least a portion of a projection of the first adapter in the third direction, the third direction is perpendicular to the first direction and the second direction, the second electrode terminal further includes a second adapter connected to the second body portion and the tab, respectively, the second reinforcement portion is overlapped with at least a portion of a projection of the second adapter in the third direction, and the third direction is perpendicular to the first direction and the second direction.

In some embodiments, the first connector includes a first connection portion and a first body, the first body is disposed in the housing and connected to the tab, and the first connection portion is at least partially penetrating through the housing and connects the first main body portion and the first body;

The second adapter comprises a second connecting part and a second body, wherein the second body is arranged in the shell and is connected with the tab, and the second connecting part at least partially penetrates through the shell and is connected with the second main body part and the second body.

In some embodiments, the battery cell further includes an insulating sealing ring, and the insulating sealing ring is sleeved outside the first connection portion and the second connection portion respectively.

In some embodiments, the reinforcement portion extends at least partially to a side of the body portion facing the housing.

In some embodiments, a mounting groove is formed in a side of the extension portion facing the housing, and the reinforcement portion is at least partially disposed in the mounting groove.

In some embodiments, the thickness W of the reinforcement portion satisfies 0.1 mm≤W≤1 mm.

In some embodiments, the reinforcement is thermally compositely connected with the extension, or the reinforcement is disposed between the extension and the housing.

In some embodiments, the electrode terminal is a positive electrode terminal, the reinforcement is a copper layer, and the strength of the reinforcement is greater than the strength of the extension.

In a second aspect, an embodiment of the present application provides a cover assembly applied to a battery device, where electrode terminals of the battery cells are disposed on the cover assembly.

In a third aspect, an embodiment of the present application provides a battery device, including a plurality of the battery cells according to any one of the above embodiments.

In some embodiments, the battery device further includes a buss member electrically connected with the extension of the corresponding battery cell.

In a fourth aspect, an embodiment of the present disclosure provides an energy storage device, including a plurality of the battery cells according to any one of the embodiments or a plurality of the battery devices according to any one of the embodiments, where the battery cells or the battery devices are used to store or provide electric energy.

In a fifth aspect, an embodiment of the present disclosure provides an energy storage system, including a power conversion device and an energy storage device according to any one of the embodiments above, where the power conversion device is configured to electrically connect a power generation device and the energy storage device.

In a sixth aspect, an embodiment of the present application provides an electrical device, including a battery unit according to any one of the embodiments described above, a battery device according to any one of the embodiments described above, an energy storage device according to any one of the embodiments described above, or an energy storage system according to any one of the embodiments described above, where the battery unit or the battery device is configured to store or provide electrical energy.

In a seventh aspect, an embodiment of the present application provides a charging network, which is characterized by comprising a charging pile and the energy storage device according to any one of the foregoing embodiments or the energy storage system according to any one of the foregoing embodiments, where the energy storage device is configured to provide electric energy for the charging pile.

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 will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of an energy storage system according to some embodiments of the present application;

Fig. 2 is a schematic structural diagram of a charging network according to some embodiments of the present application;

FIG. 3 is a schematic illustration of a vehicle according to some embodiments of the present application;

fig. 4 is an exploded view of a battery device according to some embodiments of the present application;

fig. 5 is a schematic structural diagram of a battery cell according to some embodiments of the present application;

FIG. 6 is a schematic diagram of a second embodiment of a battery cell according to the present application;

Fig. 7 is a schematic diagram of a third embodiment of a battery cell according to the present application;

Fig. 8 is a schematic diagram of a battery cell according to some embodiments of the present application;

Fig. 9 is a schematic diagram showing a battery cell according to some embodiments of the present application;

Fig. 10 is a schematic diagram showing a structure of a battery cell according to some embodiments of the present application;

FIG. 11 is a schematic diagram of a battery cell according to some embodiments of the present application;

fig. 12 is a schematic diagram illustrating a battery cell according to some embodiments of the present application;

Fig. 13 is a diagram illustrating a structure of a battery cell according to some embodiments of the present application;

Fig. 14 is a schematic view illustrating a structure of a battery cell according to some embodiments of the present application;

Fig. 15 is a schematic diagram of a battery cell according to an embodiment of the application;

FIG. 16 is a schematic diagram showing a structure of a battery cell according to some embodiments of the present application;

FIG. 17 is a schematic diagram of a battery cell according to some embodiments of the present application;

FIG. 18 is a schematic diagram illustrating a structure of a battery cell according to some embodiments of the present application;

FIG. 19 is a schematic diagram showing fifteen embodiments of a battery cell according to the present application;

FIG. 20 is a schematic diagram of a battery cell according to some embodiments of the present application;

FIG. 21 is a schematic diagram showing seventeen kinds of battery cells according to some embodiments of the present application;

FIG. 22 is a schematic diagram of a battery cell according to some embodiments of the present application;

fig. 23 is a schematic illustration of a battery cell according to some embodiments of the present application;

Fig. 24 is a schematic diagram showing a structure of a battery cell according to some embodiments of the present application;

Fig. 25 is a schematic diagram of twenty-one of battery cells according to some embodiments of the present application.

Reference numerals:

The energy storage device 1, the power conversion equipment 2, the power generation equipment 3, the charging pile 4 and the connector 5;

a vehicle 1000;

a battery device 100;

a case 10, a first case body 11, and a second case body 12;

Battery cell 20, case 21, electrode assembly 22, tab 221;

The first electrode terminal 23, the first body portion 231, the first protruding portion 2311, the first extending portion 232, the first adapter 233, the first reinforcing portion 234, the mounting groove 235;

the second electrode terminal 24, the second main body portion 241, the second extension portion 242, the second protrusion 2421, the second adapter 243, the second connection portion 2431, the second body 2432, the second reinforcement portion 245;

a reinforcing part;

The insulator 26, the insulator plate 261, the spacer 262, the first segment 2621, the first groove 26211, the second groove 26112, the second segment 2622, the third segment 2623, the first spacer 2624, the first stopper 26241, the second stopper 26242, the second spacer 2625, the positioning portion 2651, the frame 263, the first receiving chamber 264, the second receiving chamber 265, the first escape hole 266, the second escape hole 267;

the fixing piece 27, the flanging 271 and the ventilation holes 272;

An insulating seal ring 28;

A cover assembly 29, a cover body 291;

Controller 200, and motor 300.

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.

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).

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 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 may be in a cylindrical shape, a flat shape, a rectangular parallelepiped shape, or other shapes, which is not limited in this embodiment of the application. The battery cells are generally classified into three types, i.e., a cylindrical battery cell, a prismatic battery cell, and a pouch battery cell, according to the packaging method, to which the embodiment of the present application is not limited.

The battery cell includes a case, an electrode assembly, and an electrolyte, and the case is used to accommodate the electrode assembly and the electrolyte. The electrode assembly consists of a positive electrode plate, a negative electrode plate and a separation film. The battery cell mainly relies on metal ions to move between the positive pole piece and the negative pole piece to work. The positive electrode plate comprises a positive electrode current collector and a positive electrode active material layer, wherein the positive electrode current collector comprises a positive electrode current collector body and a positive electrode lug, the positive electrode active material layer is coated on the surface of the positive electrode current collector body, and the positive electrode lug is not coated with the positive electrode active material layer and protrudes out of the positive electrode current collector body. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate or the like. The negative electrode plate comprises a negative electrode current collector and a negative electrode active material layer, the negative electrode current collector comprises a negative electrode current collector body and a negative electrode tab, the negative electrode active material layer is coated on the surface of the negative electrode current collector body, the negative electrode tab is not coated with the negative electrode active material layer, and the negative electrode tab protrudes out of the negative electrode current collector body. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the high current is passed without fusing, the number of positive electrode lugs is multiple and stacked together, and the number of negative electrode lugs is multiple and stacked together.

The material of the separator may be PP (polypropylene) or PE (polyethylene). In addition, the electrode assembly may be a roll-to-roll structure or a lamination structure, and embodiments of the present application are not limited thereto.

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 cell is used for storing or providing electric energy.

Based on the above-mentioned considerations, the inventors have conducted intensive studies to design a battery cell including a case including a wall portion, an electrode assembly including a tab mounted in the case, and an electrode terminal disposed in the case, the electrode terminal including a main body portion electrically connected to the tab, an extension portion protruding from the main body portion in a first direction perpendicular to a thickness direction of the wall portion, and electrically connected to the main body portion and the bus bar, and a reinforcement portion disposed at one side of the extension portion toward the wall portion.

In the battery cell with the structure, the deformation risk of the extension part can be reduced by arranging the reinforcing part on the inner side of the extension part, so that the bending strength and the shear strength of the extension part are improved, the risk that the extension part of the electrode terminal is deformed or broken when bearing external pressure or vibration is reduced, and the overall reliability and the safety of the battery cell are improved.

The battery device (Battery Apparatus) as referred to in embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly (Battery Cell Assembly) may include a plurality of battery cells connected in series, parallel, or series-parallel by a bus bar.

In some embodiments, the battery cell assembly (Battery Cell Assembly) is generally formed from an arrangement of a plurality of battery cells.

As an example, the Battery cell assembly may be a Battery Module (Battery Module) 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 (battery Pack) that includes 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 solutions described in the embodiments of the present application are applicable to various electric devices using battery devices, for example, mobile phones, portable devices, notebook computers, battery cars, electric toys, electric tools, vehicles, ships, spacecraft, etc., and for example, spacecraft includes airplanes, rockets, space shuttles, spacecraft, etc. The battery device is used for storing or providing electric energy.

Embodiments of the present application provide an energy storage device including one or more Battery clusters (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.

The energy storage device can be used for an energy storage power station, a wind power generation system, a solar power generation system, a mobile power system or a temporary power supply system and the like. The energy storage device may store electrical energy as needed and output electrical energy when appropriate. For example, the energy storage device may store electrical energy during low power usage and provide electrical energy to an associated consumer or power device during peak power usage. The energy storage system provided by the embodiment of the application can be any power system needing an energy storage device.

In some embodiments, the energy storage device is an energy storage container or an energy storage electrical cabinet.

In some embodiments, the energy storage device may include a cabinet and one or more battery clusters housed in the cabinet.

In some embodiments, the energy storage device may include modules such as a thermal management module, a master control module, a power distribution module, and a fire protection module.

As an example, the thermal management module may include a liquid cooling unit that supplies cooling liquid for adjusting the temperature of the battery cells to each battery device through a pipe.

As an example, the main control module may be used as a battery management unit of the battery cluster, for monitoring and managing the battery cluster. The main control module can monitor information such as current, voltage, power or temperature of the battery cluster. For example, charge-discharge current, voltage, etc. of the battery cluster may be controlled. The main control module comprises an auxiliary battery management unit SBMU (Slave Battery Management Unit, SBMU), a fusion switch and other modules.

As an example, the master control module may be used as a battery management unit of the energy storage device for monitoring and managing the energy storage device. The master control module can monitor information such as current, voltage, power, state of charge or temperature of the energy storage device. For example, the charge-discharge current, voltage, etc. of the energy storage device may be controlled. As an example, the master control module includes an insulation monitoring module IMM (Insulation Monitoring Module, abbreviated as IMM), a main battery management unit MBMU (Master Battery Management Unit, MBMU), an EtherNet ETH (ETH), and an optical fiber conversion module.

By way of example, fire protection systems include control panels, detectors, alarm devices, etc. for detecting, alarming, or extinguishing a fire in an energy storage system.

As an example, the power distribution device may be used to distribute power to energy storage device power modules.

The technical scheme described in the embodiment of the application is applicable to various electric devices using energy storage devices, 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 energy storage device is used for storing or providing electric energy.

In some embodiments, as shown in fig. 1, the energy storage system may include one or more energy storage devices 1 and a power conversion apparatus 2 (Power Converter System, abbreviated as PCS), the power conversion apparatus 2 being configured to be connected between the power generation apparatus 3 and the energy storage devices 1. The power generation device 3 is used for generating electric energy, and the electric energy generated by the power generation device 3 can be stored in the energy storage device 1 through the power conversion device 2. As an example, the power generation device 3 may be specifically a solar panel, a hydropower device, a fire power generation device, a wind power generation device, or the like. The specific type of power generation device 3 is not a limitation of the present application.

The technical scheme described in the embodiment of the application is applicable to various electric devices using an energy storage system, 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 energy storage device is used for storing or providing electric energy.

Referring to fig. 2, an embodiment of the present application provides a charging network, which includes a charging pile 4 and an energy storage device 1, wherein the charging pile 4 is electrically connected with the energy storage device 1, and the energy storage device 1 is used for providing electric energy for the charging pile 4. The charging pile 4 is electrically connected with a battery device in the energy storage device 1 through a cable, and the battery device can provide the charging pile 4 with electric energy stored by itself. The charging stake 4 has one or more connectors 5 for connection to an electrical device, such as a vehicle, so that the electrical device can be supplied with energy.

The energy storage device may be located inside the charging pile (e.g., a storage and charging integrated machine) or may be located outside the charging pile.

The embodiment of the application provides an electricity utilization device using a battery monomer or a battery device or an energy storage system as a power supply, wherein the electricity utilization device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft and the like. Among them, the electric toy may include fixed or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes, rockets, space planes, and spacecraft, and the like.

For convenience of description, the following embodiment will take an electric device according to an embodiment of the present application as an example of the vehicle 1000.

Referring to fig. 3, fig. 3 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the application. The vehicle 1000 may be a fuel oil vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or a range-extended vehicle. The battery device 100 is provided in the interior of the vehicle, and the battery device 100 may be provided at the bottom or the head or the tail of the vehicle. The battery device 100 may be used for power supply of a vehicle, for example, the battery device 100 may serve as an operating power source of the vehicle. The vehicle may further include a controller 200 and a motor 300, the controller 200 being configured to control the battery device 100 to power the motor 300, for example, for operating power requirements during start-up, navigation, and travel of the vehicle.

In some embodiments of the present application, the battery device 100 may be used not only as an operating power source of a vehicle, but also as a driving power source of the vehicle, instead of or in part instead of fuel oil or natural gas, to supply driving power to the vehicle.

Referring to fig. 4, fig. 4 is an exploded view of a battery device 100 according to some embodiments of the present application. The battery device 100 includes a case 10 and a plurality of battery cells 20, and the battery cells 20 are accommodated in the case 10. The case 10 is used to provide an assembly space for the battery cells 20, and the case 10 may have various structures. In some embodiments, the case 10 may include a first case body 11 and a second case body 12, the first case body 11 and the second case body 12 being covered with each other, the first case body 11 and the second case body 12 together defining an assembly space for accommodating the battery cell 20. The second box body 12 may be a hollow structure with one end opened, the first box body 11 may be a plate-shaped structure, the first box body 11 covers the open side of the second box body 12, so that the first box body 11 and the second box body 12 jointly define an assembly space, the first box body 11 and the second box body 12 may be hollow structures with one side opened, and the open side of the first box body 11 covers the open side of the second box body 12. Of course, the case 10 formed by the first case body 11 and the second case body 12 may be various shapes, such as a cylinder, a rectangular parallelepiped, and the like.

In the battery device 100, the plurality of battery cells 20 may be connected in series or parallel or a series-parallel connection, wherein a series-parallel connection refers to that the plurality of battery cells 20 are connected in series or parallel. The plurality of battery cells 20 can be directly connected in series or parallel or in parallel-series connection, and then the whole formed by the plurality of battery cells 20 is accommodated in the box 10, however, the battery device 100 can also be in a form of a battery module formed by connecting the plurality of battery cells 20 in series or parallel or in parallel-series connection, and then the plurality of battery modules are connected in series or parallel or in parallel-series connection to form a whole and are accommodated in the box 10. The battery device 100 may further include other structures, for example, the battery device 100 may further include a bus member for making electrical connection between the plurality of battery cells 20.

Referring to fig. 4, fig. 4 is a schematic diagram illustrating a partial structure of a battery device 100 according to some embodiments of the application. The battery device 100 includes a plurality of rows of battery cells 20, the plurality of rows of battery cells 20 being arranged in a first direction, each row of battery cells 20 including a plurality of battery cells 20 arranged in a second direction. The first direction and the second direction are the length direction of the case 10 and the width direction of the case 10, respectively, and are perpendicular to each other.

According to some embodiments of the present application, as shown in fig. 5 to 25, the present application provides a battery cell 20 including a case 21, electrode terminals, and an electrode assembly 22.

As shown in fig. 5 and 16, the electrode assembly 22 is mounted in the case 21, and the electrode assembly 22 includes a tab 221, and the tab 221 includes a positive electrode tab and a negative electrode tab.

As shown in fig. 6 and 17, the electrode terminals include a first electrode terminal 23 and a second electrode terminal 24, the first electrode terminal 23 being connected to the corresponding tab 221, and the second electrode terminal 24 being connected to the corresponding tab 221.

As shown in fig. 7 and 18, the case 21 includes a cap plate assembly 29 and a case, and the case and the cap plate assembly 29 form a receiving chamber for receiving the electrode assembly 22.

The housing includes a wall portion, which may be any side wall of the housing, and illustratively, the wall portion may be a top wall of the housing.

The electrode terminal is used to be connected to the bus bar between the tab 221 of the electrode assembly 22 and the battery cell 20, and is connected to the case 21 in an insulating manner, and includes a main body portion, an extension portion, and a reinforcement portion.

The body portion is electrically connected to the tab 221 of the electrode assembly 22, and illustratively, the body portion is adapted to be connected to the tab 221 of the electrode assembly 22, and the body portion may be connected to the tab 221 by welding or the like.

The extension portion protrudes from the main body portion in a first direction perpendicular to a thickness direction of the wall portion. The extension portion is connected with the main body portion, and the extension portion and the main body portion can be connected through an integral molding mode or a welding mode.

The extension part is electrically connected to the bus bar.

The extension portion extends outward from the main body portion, and the extension portion extends in the first direction to increase a connection area of the electrode terminal and the bus bar, and to increase reliability of electrical connection.

For example, the extension portion may be provided in a flat shape, i.e., the extension portion is provided in a structure having a large aspect ratio so as to be connected to a bus bar, which is a conductive connection sheet between the different battery cells 20. The extension length of the extension portion may be set according to the layout requirements of the battery cells 20 in the battery device 100.

In some embodiments, the surface of the extension is provided with a tin plating to improve its oxidation resistance and electrical conductivity.

Wherein at least part of the reinforcement is arranged on the side of the extension facing the housing 21 to reduce the risk of deformation buckling of the extension.

In some embodiments, at least part of the reinforcing portion extends to the side of the main body portion facing the housing 21 to reinforce the main body portion, reducing the risk of deformation of the main body portion and reducing assembly and machining difficulties.

Wherein, the setting position of the reinforcement includes two kinds at least:

First, the reinforcement portion is disposed inside the extension portion and also disposed inside the main body portion.

In this embodiment, the reinforcing portions are disposed on the inner side of the main body portion and the inner side of the extension portion, so that deformation risks of the main body portion and the extension portion can be reduced, and bending strength and shear strength of the main body portion and the extension portion can be improved.

Wherein the main body and the extension are positioned at the same height, and the reinforcement is positioned between the surface of the main body and the extension and the surface of the housing 21.

The reinforcing portion may be attached to the inner sides of the main body portion and the extension portion by gluing, welding, thermal compounding, or the like, or may be stacked by contact lamination, or the like, for example.

In some embodiments, the reinforcement is thermally compositely connected to the extension or the reinforcement is disposed between the extension and the housing.

Secondly, the reinforcement portion is disposed on the inner side of the extension portion, which is the side of the extension portion facing the housing 21.

Wherein the reinforcement is located inside the extension, i.e. the reinforcement is arranged in the area between the extension and the housing 21.

The reinforcement may be attached to the inside of the extension by gluing, welding, thermal compounding, or the like, or may be stacked by contact lamination, or the like, for example.

In the present embodiment, the presence of the reinforcement makes the extension of the electrode terminal less likely to deform or break when subjected to external pressure or vibration, so as to reduce the risk of deformation of the extension due to weak structural strength with a large aspect ratio, thereby improving the overall reliability and safety of the battery cell 20.

Wherein the reinforcement portion is located between the extension portion and the housing 21, the extension direction of the reinforcement portion coincides with the extension portion, and the width of the reinforcement portion is not greater than the width of the extension portion, so that the assembly of the extension portion and the reinforcement portion with the housing 21 is facilitated.

In some embodiments, the strength of the reinforcement is greater than the strength of the extension, i.e., the strength of the reinforcement is greater than the strength of the extension, and the reinforcement is disposed inside the extension, which may reduce the risk of deformation of the extension to improve the bending and shear strength of the extension.

In this embodiment, the reinforcing portion may be made of a material having a material strength greater than that of the material strength of the extension portion and the main body portion.

For example, the body portion and the extension portion may be aluminum pieces, the reinforcement portion may be a material having a strength greater than that of aluminum, and for example, the reinforcement portion may be made of copper or steel.

The main body and the extension of the negative electrode terminal may be formed by compounding upper aluminum and lower copper, the reinforcing part may be made of steel material having strength greater than that of aluminum or copper, or the main body and the extension of the positive electrode terminal may be aluminum members, and the reinforcing part may be a copper layer or a steel layer, for example.

In some embodiments, as shown in fig. 13, a mounting groove 235 is provided on a side of the extension portion facing the housing 21, and at least a portion of the reinforcement portion is provided in the mounting groove 235.

Wherein, the reinforcing part is embedded in the mounting groove 235, which can reduce the influence of the reinforcing part on the thickness of the electrode terminal along the third direction, and can reduce the risk of deformation and warping of the electrode terminal.

In some embodiments, the thickness W of the reinforcement is 0.1 mm≤W≤1 mm, preferably 0.2 mm≤W≤0.5 mm.

Exemplary, W may be 0.3mm, 0.4mm, or 0.5mm.

In the present embodiment, by defining the thickness W of the reinforcement portion, the influence of the height of the battery cell 20 can be reduced, reducing the difficulty of assembly.

In the related art, the extension part has a weak structural strength due to a large aspect ratio, and risks such as deformation and fracture exist, which is not beneficial to the stability of the battery cell 20.

According to the battery cell 20 provided by the application, the bending strength and the shear strength of the extension part can be improved by arranging the reinforcing part on the inner side of the extension part, so that the deformation risk of the extension part is reduced, the deformation or fracture risk of the extension part of the electrode terminal when the extension part bears external pressure or vibration is reduced, and the overall reliability and safety of the battery cell 20 are improved.

As shown in fig. 8 and 19, according to some embodiments of the present application, the present application is a battery cell 20 having electrode terminals on the same side, the electrode terminals including a first electrode terminal 23 and a second electrode terminal 24 provided in an insulating manner, one of the first electrode terminal 23 and the second electrode terminal 24 being a positive electrode, and the other of the first electrode terminal 23 and the second electrode terminal 24 being a negative electrode.

As shown in fig. 9 and 21, the main body portion, the extension portion, and the reinforcement portion of the first electrode terminal 23 are the first main body portion 231, the first extension portion 232, and the first reinforcement portion 234, respectively, and the main body portion, the extension portion, and the reinforcement portion of the second electrode terminal 24 are the second main body portion 241, the second extension portion 242, and the second reinforcement portion 245, respectively.

The main body of the first electrode terminal 23 is a first main body 231, the extension of the first electrode terminal 23 is a first extension 232, the reinforcement of the first electrode terminal 23 is a second reinforcement 234, the main body of the second electrode terminal 24 is a second main body 241, the extension of the second electrode terminal 24 is a second extension 242, and the reinforcement of the second electrode terminal 24 is a second reinforcement 245.

The first body portion 231 and the second body portion 241 are arranged in a first direction, the first extension portion 232 and the second extension portion 242 are arranged in a second direction perpendicular to the first direction, the first reinforcement portion 234 is provided between the first extension portion 232 and the housing 21, and the second reinforcement portion 245 is provided between the second extension portion 242 and the housing 21.

Wherein, the first direction and the second direction are perpendicular, one of the first direction and the second direction is the length direction of the battery cell 20, and the other of the first direction and the second direction is the width direction of the battery cell 20.

For example, in the present embodiment, the first direction may be a length direction of the battery cell 20, and the second direction may be a width direction of the battery cell 20, so as to extend lengths of the first extension 232 and the second extension 242, thereby increasing a connection area of the electrode terminal and the bus bar, and increasing reliability of electrical connection.

In the present embodiment, the first electrode terminal 23 and the second electrode terminal 24 form a snap arrangement in which the effective area of the first extension 232 and the second extension 242 can be increased, and the first electrode terminal 23 and the second electrode terminal 24 can be made more compact in structure.

According to some embodiments of the present application, a central axis of the first extension portion 232 extending along the first direction is offset from a central axis of the first body portion 231 extending along the first direction, and a central axis of the second extension portion 242 extending along the first direction is offset from a central axis of the second body portion 241 extending along the first direction.

Wherein the shape of the first body portion 231 and the second body portion 241 may be determined according to the installation position.

As shown in fig. 9 and 21, the end of the first body 231 and the second body 241 facing away from each other may be circular or rectangular.

The first extension portion 232 is located at one end of the first body portion 231 along the first direction and protrudes from the first body portion 231 along the first direction, and the second extension portion 242 is located at one end of the second body portion 241 along the first direction and protrudes from the second body portion 241 along the first direction.

In this embodiment, the first electrode terminal 23 and the second electrode terminal 24 may have the same structure, the first electrode terminal 23 and the second electrode terminal 24 are arranged in a central symmetry, one end of the second extension portion 242 facing away from the second body portion 241 is close to the first body portion 231, one end of the first extension portion 232 facing away from the first body portion 231 is close to the second body portion 241, and one side of the second extension portion 242 and the first extension portion 232 along the second direction is close to each other, so that the layout structure of the first electrode terminal 23 and the second electrode terminal 24 is more compact.

According to some embodiments of the present application, as shown in fig. 15, projections of the first electrode terminal 23 and the second electrode terminal 24 along a third direction, which may be a height direction of the battery cell 20, at least partially overlap each other, the third direction being perpendicular to the first direction and the second direction.

Wherein the side of the first electrode terminal 23 and the second electrode terminal 24, which are close to each other, may overlap in projection in the third direction,

The first electrode terminal 23 further includes a first protruding portion 2311, the first protruding portion 2311 extends at least partially to a side of the second extending portion 242 facing away from the case 21, the second reinforcing portion 245 at least partially coincides with a projection of the first protruding portion 2311 along a third direction, the third direction is perpendicular to the first direction and the second direction, and the first protruding portion 2311 is pressed over the second extending portion 242 and the second reinforcing portion 245 along the third direction, so that an interlocking effect can be achieved, and the second extending portion 242 and the second reinforcing portion 245 are fixed, thereby reducing a buckling deformation risk of the second extending portion 242 and the second reinforcing portion 245.

In some embodiments, the side of the first body portion 231 facing the second extension portion 242 is connected to the first protrusion, and the side of the second body portion 241 facing the first extension portion 232 is connected to the second protrusion.

In this embodiment, the first protruding portion is used for locking one end of the second extending portion 242 away from the second main body portion 241, so that the weak end of the second extending portion 242 can be fixed, and further the buckling deformation risk of the second extending portion 242 and the second reinforcing portion 245 is further increased, and the second protruding portion is used for locking one end of the first extending portion 232 away from the first main body portion 231, so that the weak end of the first extending portion 232 can be fixed, and further the buckling deformation risk of the first extending portion 232 and the first reinforcing portion 234 is further increased.

Wherein the portions of the sides of the first electrode terminal 23 and the second electrode terminal 24 that are close to each other may overlap in projection in the third direction.

Illustratively, the second electrode terminal 24 further includes a second protruding portion 2421, the second protruding portion 2421 extends at least partially to a side of the first extending portion 232 facing away from the case 21, the first reinforcing portion 234 is overlapped with at least a portion of a projection of the second protruding portion 2421 along a third direction, the third direction is perpendicular to the first direction and the second direction, and the second protruding portion 2421 is pressed over the first extending portion 232 and the first reinforcing portion 234 along the third direction, so that an interlocking effect can be achieved, thereby fixing the first extending portion 232 and the first reinforcing portion 234, and reducing a risk of buckling deformation of the first extending portion 232 and the first reinforcing portion 234.

In the present embodiment, the first electrode terminal 23 and the second electrode terminal 24 are fitted in the third direction to form an interlocking structure, so that the connection stability of the first electrode terminal 23 and the second electrode terminal 24 with the case 21 can be increased, the risk of buckling deformation of the first extension 232 and the second extension 242 can be reduced, and the structural compactness of the battery cell 20 can be improved.

According to some embodiments of the application, as shown in fig. 15, the projections of the first body portion 231 and the second extension portion 242 in the third direction at least partially coincide, and the projections of the second body portion 241 and the first extension portion 232 in the third direction at least partially coincide.

Wherein, as shown in fig. 13 and 14, one end of the second extension portion 242 facing away from the second body portion 241 is at least partially overlapped with the projection of the first body portion 231 along the third direction, one end of the second extension portion 242 facing away from the second body portion 241 is interlocked with the first body portion 231, one end of the first extension portion 232 facing away from the first body portion 231 is at least partially overlapped with the projection of the second body portion 241 along the third direction, and one end of the first extension portion 232 facing away from the first body portion 231 is interlocked with the second body portion 241.

Illustratively, an end of the second extending portion 242 facing away from the second body portion 241 and an end of the first body portion 231 facing the second extending portion 242 are provided with a concave-convex matching structure, an end of the second extending portion 242 facing away from the second body portion 241 and an end of the first body portion 231 facing the second extending portion 242 are in concave-convex matching and insulating arrangement, an end of the first extending portion 232 facing away from the first body portion 231 and an end of the second body portion 241 facing the first extending portion 232 are provided with a concave-convex matching structure, and an end of the first extending portion 232 facing away from the first body portion 231 and an end of the second body portion 241 facing the first extending portion 232 are in concave-convex matching and insulating arrangement.

Wherein, the end of the second extension portion 242 facing away from the second body portion 241 and the end of the first body portion 231 facing the second extension portion 242 may be partially provided with a concave-convex structure, or the end of the second extension portion 242 facing away from the second body portion 241 and the entire end surface of the end of the first body portion 231 facing the second extension portion 242 may be provided with a concave-convex structure, and the end of the first extension portion 232 facing away from the first body portion 231 and the end of the second body portion 241 facing the first extension portion 232 may be partially provided with a concave-convex structure, or the end of the first extension portion 232 facing away from the first body portion 231 and the entire end surface of the end of the second body portion 241 facing the first extension portion 232 may be provided with a concave-convex structure.

In the present embodiment, by providing the interlocking structure of the end of the second extension portion 242 facing away from the second body portion 241 and the first body portion 231, the interlocking structure of the end of the first extension portion 232 facing away from the first body portion 231 and the second body portion 241 can achieve the interlocking of the first electrode terminal 23 and the second electrode terminal 24 without affecting the contact areas of the first extension portion 232 and the second extension portion 242 with the bus bar, improving the stability and reliability of the battery cell 20.

According to some embodiments of the present application, as shown in fig. 8 and 19, the battery cell 20 further includes an insulating member 26, at least a portion of the insulating member 26 being disposed between the first electrode terminal 23, the second electrode terminal 24, and the case 21.

Wherein the insulator 26 may be connected to the housing 21 by welding, clamping or fastening.

In the present embodiment, the insulating member 26 is used to insulate the first electrode terminal 23, the second electrode terminal 24, and the case 21 from each other.

Wherein at least part of the insulating member 26 is disposed between the first electrode terminal 23 and the second electrode terminal 24 to achieve insulation between the first electrode terminal 23 and the second electrode terminal 24, at least part of the insulating member 26 is disposed between the first electrode terminal 23 and the case 21 to achieve insulation between the first electrode terminal 23 and the case 21, and at least part of the insulating member 26 is disposed between the second electrode terminal 24 and the case 21 to achieve insulation between the second electrode terminal 24 and the case 21.

By way of example, the insulating member 26 may be a ceramic member, a plastic member, or a rubber member.

According to some embodiments of the present application, as shown in fig. 8 and 19, at least a portion of the insulating member 26 is provided to the case 21, at least a portion of the insulating member 26 is connected to the case 21, and the first electrode terminal 23 and the second electrode terminal 24 are mounted to the insulating member 26.

According to some embodiments of the present application, as shown in fig. 15, the projections of the first electrode terminal 23, the insulating member 26, and the second electrode terminal 24 along the third direction are at least partially overlapped.

Wherein at least a portion of the first electrode terminal 23, at least a portion of the insulating member 26, and at least a portion of the second electrode terminal 24 are interlocked in the third direction, so that the connection stability of the first electrode terminal 23 and the second electrode terminal 24 with the case 21 can be increased, the structural compactness of the battery cell 20 can be improved, and the insulation between the first electrode terminal 23 and the second electrode terminal 24 can be achieved.

According to some embodiments of the present application, as shown in fig. 10 and 20, the insulating member 26 includes an insulating plate 261 and a spacer 262.

The first electrode terminal 23 and the second electrode terminal 24 are mounted to the insulating plate 261 at a distance to insulate the first electrode terminal 23 and the second electrode terminal 24, at least a portion of the insulating plate 261 is disposed between the first reinforcement 234 and the case 21 to insulate the first reinforcement 234 and the case 21, and at least a portion of the insulating plate 261 is disposed between the second reinforcement 245 and the case 21 to insulate the second reinforcement 245 and the case 21.

Wherein the first reinforcement portion of the first electrode terminal 23 and the second reinforcement portion of the second electrode terminal 24 are supported by an insulating plate 261, and the insulating plate 261 is used for insulation between the first electrode terminal 23 and the case 21 and between the second electrode terminal 24 and the case 21.

The spacer 262 is connected to the insulating plate 261, and the spacer 262 is disposed between the first electrode terminal 23 and the second electrode terminal 24, the first electrode terminal 23 and the second electrode terminal 24 being spaced apart so as to be mounted at both sides of the spacer 262, the spacer 262 serving for insulation between the first electrode terminal 23 and the second electrode terminal 24.

Wherein the insulating plate 261 and the spacer 262 may be connected by integral molding or gluing.

In some embodiments, the insulating member 26 is an injection molding member, the first electrode terminal 23 and the second electrode terminal 24 are placed in a plastic molding mold, and the thermoplastic or thermosetting material is injected into the plastic molding mold to form the insulating member 26, so that the first electrode terminal 23, the second electrode terminal 24 and the insulating member 26 form an assembly, and the assembly formed by the first electrode terminal 23, the second electrode terminal 24 and the insulating member 26 can be assembled with the housing 21 integrally, thereby reducing the installation difficulty.

According to some embodiments of the present application, as shown in fig. 9 and 10, the spacer 262 includes a first section 2621, a second section 2622, and a third section 2623 connected in sequence, and the first section 2621, the second section 2622, and the third section 2623 are integrally formed.

The first section 2621 is located between the first body portion 231 and the second extension portion 242, the second section 2622 is located between the first extension portion 232 and the second extension portion 242, and the third section 2623 is located between the first extension portion 232 and the second body portion 241.

In the present embodiment, the first electrode terminal 23 and the second electrode terminal 24 may be spaced apart and insulated by disposing the separator 262 to include the first section 2621, the second section 2622, and the third section 2623 connected in sequence, thereby reducing the risk of short circuits. The positions and lengths of the first, second and third segments 2621, 2622 and 2623 may be set according to the structures of the first and second electrode terminals 23 and 24.

In some embodiments, as shown in fig. 9, the first and third sections 2621 and 2623 are disposed in parallel, and the first and third sections 2621 and 2623 are bent at the second section 2622, respectively, and the first, second and third sections 2621 and 2622 and 2623 form a zigzag structure, so that compactness of the layout of the first and second electrode terminals 23 and 24 can be improved.

According to some embodiments of the present application, as shown in fig. 13, 14, 24 and 25, the projections of the first protruding portion 2311, the first segment 2621 and the second extending portion 242 along the third direction at least partially overlap, and a portion of the first segment 2621 is clamped between the first protruding portion 2311 and the second extending portion 242 to achieve an interlocking effect of the first protruding portion 2311 and the second extending portion 242 while achieving insulation.

The projections of the first extension 232, the third section 2623 and the second protrusion 2421 along the third direction at least partially overlap, and a portion of the third section 2623 is clamped between the first extension 232 and the second protrusion 2421 to achieve the interlocking effect of the first extension 232 and the second protrusion 2421 and simultaneously achieve insulation.

In the present embodiment, as shown in fig. 9, the second section 2622 is disposed between the first extension 232 and the second extension 242 to achieve insulation between the first extension 232 and the second extension 242.

For example, the projections of the first extension 232, the second section 2622 and the second extension 242 along the third direction may be at least partially overlapped, thereby forming an interlocking effect between the first extension 232 and the second extension 242 and simultaneously realizing insulation between the first extension 232 and the second extension 242, or the projections of the first extension 232, the second section 2622 and the second extension 242 along the third direction may not be overlapped, the second section 2622 may be only positioned between the first extension 232 and the second extension 242, insulation between the first extension 232 and the second extension 242 may be realized, and simultaneously, the connection area of the first extension 232 and the second extension 242 to the corresponding bus bar may not be affected, thereby improving the reliability of connection of the first electrode terminal 23 and the second electrode terminal 24 to the corresponding bus bar.

According to some embodiments of the present application, the length of the first protrusion 2311 in the second direction is smaller than the length of the first segment 2621 in the second direction so that the first protrusion 2311 is in a concavo-convex fit connection with the first segment 2621, and the length of the second protrusion 2421 in the second direction is smaller than the length of the third segment 2623 so that the second protrusion 2421 is in a concavo-convex fit connection with the third segment 2623.

According to some embodiments of the present application, as shown in fig. 15, the first section 2621 is provided with a first groove 26211 and a second groove 26112 on both sides in the first direction, the first groove 26211 and the second groove 26112 are respectively notched toward the first body portion 231 and the second extension portion 242, the first body portion 231 is provided with a first protrusion 2311 adapted to the first groove 26211, and the second extension portion 242 is provided with a second protrusion 2421 adapted to the second groove 26112.

The first groove 26211 is in concave-convex fit with the first protruding portion 2311 of the first main body 231, and the second groove 26212 is in concave-convex fit with the second protruding portion 2421 of the second extending portion 242, so that the projections of the first main body 231, the first section 2621 and the second extending portion 242 along the third direction are at least partially overlapped, and the first main body 231, the first section 2621 and the second extending portion 242 form a concave-convex fit interlocking structure, thereby not only realizing insulation of the first electrode terminal 23 and the second electrode terminal 24, but also improving the connection stability of the first electrode terminal 23 and the second electrode terminal 24 with the insulating member 26, and improving the compactness of the structural layout.

Illustratively, portions of both sides of the first section 2621 in the first direction may form the first groove 26211 and the second groove 26112, or the entire section of both sides of the first section 2621 in the first direction may form the first groove 26211 and the second groove 26112, both for interlocking and insulating effects.

The third section 2623 is provided with a third groove and a fourth groove along two sides of the first direction, the notches of the third groove and the fourth groove face the first extending portion 232 and the second main body portion 241 respectively, the first extending portion 232 is provided with a third protruding portion adapted to the third groove, and the second main body portion 241 is provided with a fourth protruding portion adapted to the fourth groove.

Wherein, the third groove is matched with the third protruding part of the first extending part 232 in a concave-convex manner, and the fourth groove is matched with the fourth protruding part of the second main body part 241 in a concave-convex manner, so that the projection of the first extending part 232, the third section 2623 and the second main body part 241 along the third direction is at least partially overlapped, the first extending part 232, the third section 2623 and the second main body part 241 form a concave-convex interlocking structure, thereby realizing the insulation of the first electrode terminal 23 and the second electrode terminal 24, improving the connection stability of the first electrode terminal 23 and the second electrode terminal 24 with the insulating part 26, and improving the compactness of the structural layout.

For example, the third and fourth grooves may be formed at portions of both sides of the third section 2623 in the first direction, or the third and fourth grooves may be formed at the entire sections of both sides of the third section 2623 in the first direction, both of which may achieve interlocking and insulating effects, and simultaneously, also achieve positioning effects of the first and second electrode terminals 23, 26 and 24, enhancing the stability of the connection of the first and second electrode terminals 23, 26 and 24.

According to some embodiments of the present application, as shown in fig. 20, the length of the first groove 26211 along the second direction is smaller than the length of the first section 2621 along the second direction, that is, the first groove 26211 is formed on a part of the side of the first section 2621 facing the first main body 231, so that the concave-convex snap connection between the first groove 26211 and the first protrusion 2311 can be achieved, and the positioning fit between the first groove 26211 and the first protrusion 2311 can be achieved.

According to some embodiments of the present application, the length of the second groove 26212 along the second direction is smaller than the length of the first section 2621 along the second direction, that is, the second groove 26212 is formed on a part of the side of the first section 2621 facing the second extension portion 242, so that the concave-convex snap connection between the second groove 26112 and the second protrusion 2421 is achieved, and the positioning fit between the second groove 26112 and the second protrusion 2421 is also achieved.

According to some embodiments of the present application, the length of the fourth groove along the second direction is smaller than the length of the third section 2623 along the second direction, that is, the third section 2623 forms the fourth groove toward the part of the side of the second main body portion 241, so that the concave-convex snap connection of the fourth groove and the fourth protruding portion is realized, and the positioning fit of the fourth groove and the fourth protruding portion is also realized.

According to some embodiments of the present application, the length of the third groove along the second direction is smaller than the length of the third segment 2623 along the second direction, that is, the third groove is formed on a part of the side of the third segment 2623 facing the first extension portion 232, so that the concave-convex snap connection of the third groove and the third protrusion can be realized, and the positioning fit of the third groove and the third protrusion can be also realized.

According to some embodiments of the present application, the length of the second protrusion 2421 along the second direction is greater than the length of the first protrusion 2311 along the second direction, thereby reducing the processing difficulty.

According to some embodiments of the application, the length of the third protruding portion along the second direction is greater than the length of the fourth protruding portion along the second direction, so that the processing difficulty is reduced.

According to some embodiments of the present application, as shown in fig. 15, the groove walls and the groove bottoms of the first groove 26211, the second groove 26212, the third groove and the fourth groove are provided with chamfers, which are convenient for assembly and reduce stress concentration.

According to some embodiments of the present application, the third direction may be the height direction of the battery cell 20, and the height of the spacer 262 in the third direction is greater than the height of the first and second electrode terminals 23 and 24 in the third direction, so that the insulation effect between the first and second electrode terminals 23 and 24 may be improved, and the risk of short circuits may be reduced.

According to some embodiments of the present application, as shown in fig. 10 and 24, the spacer 262 includes first and second spacers 2624 and 2625 distributed along the third direction, and the sum of heights of the first and second spacers 2624 and 2625 along the third direction is greater than the heights of the first and second electrode terminals 23 and 24 along the third direction.

The height of the first spacer 2624 in the third direction is not greater than the first and second electrode terminals 23 and 24, the height of the first spacer 2624 in the third direction is equal to or less than the first and second electrode terminals 23 and 24, and the first spacer 2624 serves for insulation between the first and second electrode terminals 23 and 24.

Wherein the height of the second spacer 2625 in the third direction is greater than the first electrode terminal 23 and the second electrode terminal 24. The second spacer 2625 serves to provide additional insulation space for the first and second electrode terminals 23 and 24 to reduce insulation risk due to vibration of the first and second electrode terminals 23 and 24 in the third direction.

According to some embodiments of the application, as shown in fig. 20 and 21, the second section 2622 of the second spacer 2625 has at least one positioning portion 2621, and the positioning portion 2651 may include one or more positioning portions 2621 distributed on the second section 2622 of the second spacer 2625.

The positioning portion 26151 may be a bump or a groove, and the positioning portion 26151 is configured to cooperate with the bus bar to position the bus bar, so as to reduce the difficulty in assembling the electrode terminal and the bus bar. The positioning portion 2651 may extend in a third direction at the second section 2622 of the second spacer portion 2625,

For example, the positioning portion 2651 may be disposed at both sides of the second section 2622 of the second spacer portion 2625 in the second direction to have a positioning effect on both the bus bar connected to the first electrode terminal 23 and the bus bar connected to the second electrode terminal 24.

According to some embodiments of the present application, as shown in fig. 20, the first spacer 2624 has at least one first stopper 26241, and the first stopper 26241 is concavely and convexly engaged with the first and second extensions 232 and 242 to define degrees of freedom of the first and second extensions 232 and 242 in the third direction.

Wherein, at least one first limiting part 26241 is disposed at one end of the first spacing part 2624 near the second spacing part 2625 in the third direction to limit the movement of the first electrode terminal 23 and the second electrode terminal 24 toward the second spacing part 2625 beyond the first spacing part 2624.

The at least one first stopper 26241 may be disposed at least one of the first, second, and third sections 2621, 2622, 2623 of the first spacer 2624.

At least one first stopper 26241 may be provided separately at both sides of the first spacer 2624 to limit both the first electrode terminal 23 and the second electrode terminal 24 in the third direction.

The first limiting portion 26241 may be a bump.

The first spacing portion 26241 may include a plurality of first spacing portions 26241 spaced apart along the extending direction of the first spacing portion 2624 to enhance the spacing effect.

In some embodiments, as shown in fig. 20, the second section 2622 of the first spacer 2624 has at least one first stopper 26241, the first stopper 26241 limits the first and second extensions 232 and 242, thereby restricting the movement of the first and second electrode terminals 23 and 24 across the first spacer 2624 toward the second spacer 2625.

The first limiting portion 26241 may be disposed at both sides of the second section 2622 of the first spacer 2624 to limit the first and second extension portions 232 and 242 along the third direction.

The first spacing portion 26241 may extend along the second section 2622 of the first spacing portion 2624 to enhance the spacing effect.

The first limiting portion 26241 may include a plurality of first limiting portions 26241 spaced apart along the extending direction of the second section 2622 of the first spacing portion 2624 to enhance the limiting effect.

In some embodiments, as shown in fig. 8, the battery cell 20 further includes a fixing member 27, at least part of the fixing member 27 is disposed at a side of the first electrode terminal 23 and the second electrode terminal 24 facing away from the case 21, and the fixing member 27 is connected with the case 21.

In the present embodiment, the fixing member 27 may play a role in fixing the first and second electrode terminals 23 and 24 to improve the stability of the connection of the first and second electrode terminals 23 and 24 with the case 21.

The connection manner of the insulating member 26 and the housing 21 at least includes the following two manners:

First, as shown in fig. 8, the insulator 26 is connected to the housing 21 by a fixing member 27.

In this embodiment, the battery unit 20 further includes a fixing member 27, where the insulating member 26 and the fixing member 27 may be connected by clamping, sleeving, or gluing, and the fixing member 27 is used for being connected with the housing 21 by welding.

The fixing member 27 may be sleeved with the frame 263 of the insulating member 26, and the insulating member 26 may insulate the first electrode terminal 23, the second electrode terminal 24, the case 21, and the fixing member 27 from each other.

Illustratively, as shown in fig. 8 and 10, at least a portion of the insulator 26 is disposed on the outer periphery of the fixture 27 to achieve a socket joint of the insulator 26 and the fixture 27.

At least portions of the first electrode terminal 23 and the second electrode terminal 24 are connected to the tab 221 of the electrode assembly 22 through the insulating member 26 and the fixing member 27 in sequence.

As shown in fig. 11, the first body portion 231 of the first electrode terminal 23 and the second body portion 241 of the second electrode terminal 24 protrude into the case 21 through the insulator 26 and the fixture 27, and are electrically connected with the tab 221 of the electrode assembly 22.

By providing the fixing member 27, the insulating member 26 is connected with the housing 21 through the fixing member 27, and the assembly formed by the first electrode terminal 23, the second electrode terminal 24 and the insulating member 26 can be integrally assembled with the housing 21, thereby realizing modular assembly and reducing assembly difficulty.

According to some embodiments of the present application, as shown in fig. 8 and 12, the fixing member 27 is provided with a flange 271 bent outward, the flange 271 being for connection with the housing 21 by welding.

The flange 271 extends along the extending direction of the fixing member 27, and by providing the flange 271, the welding area of the fixing member 27 and the housing 21 can be increased, the reliability of connection can be increased, and the sealing effect of the connecting portion of the fixing member 27 and the housing 21 can be improved.

According to some embodiments of the present application, as shown in fig. 8 and 10, at least part of the insulating member 26 is disposed between the electrode terminal and the fixing member 27.

Wherein, at least part of the insulating member 26 is disposed between the first electrode terminal 23 and the fixing member 27 to insulate the first electrode terminal 23 and the fixing member 27, at least part of the insulating member 26 is disposed between the second electrode terminal 24 and the fixing member 27 to insulate the second electrode terminal 24 and the fixing member 27, and the fixing member 27 is used for fixing the insulating member 26, the first electrode terminal 23 and the second electrode terminal 24 to increase the stability of the connection of the insulating member 26, the first electrode terminal 23 and the second electrode terminal 24 with the case 21.

According to some embodiments of the present application, as shown in fig. 8 and 10, the insulating member 26 further includes a frame 263, an insulating plate 261, and a spacer 262 to form a first receiving cavity 264 and a second receiving cavity 265, the first receiving cavity 264 and the second receiving cavity 265 being provided at both sides of the spacer 262, the first receiving cavity 264 being for receiving the first electrode terminal 23, and the second receiving cavity 265 being for receiving the second electrode terminal 24.

The height of the frame 263 along the third direction is higher than that of the insulating plate 261, that is, the first accommodating cavity 264 and the second accommodating cavity 265 are all grooves, so that the first electrode terminal 23 and the second electrode terminal 24 can be installed in the grooves, the stability of connection between the first electrode terminal 23 and the second electrode terminal 24 and the insulating member 26 is improved, the displacement risk of the first electrode terminal 23 and the second electrode terminal 24 is reduced, and the reliability of the battery cell 20 is improved.

In some embodiments, as shown in fig. 20, the frame 263 is provided with a second limiting portion 26242, and the second limiting portion 26242 protrudes inward along the extending direction of the frame 263.

The second limiting part 26242 may be disposed opposite to the first limiting part or may be disposed at a different position, and the second limiting part 26242 is used for limiting movement of the first electrode terminal 23 and the second electrode terminal 24 along the third direction.

The second limiting portion 26242 may be a protrusion.

The second stopper part 26242 may include a plurality of second stopper parts 26242 spaced apart along the extension direction of the frame 263 to enhance the stopper effect on the first and second electrode terminals 23 and 24.

As shown in fig. 20, the second limiting portion 26242 includes two limiting portions disposed at two ends of the frame 263 along the first direction and two limiting portions disposed at two ends of the frame 263 along the second direction.

In this embodiment, the insulating member 26 may be an injection molding member, and the first electrode terminal 23 and the second electrode terminal 24 are placed on the injection molding mold and then injection molded to form the insulating member 26, so that the first limiting member and the second limiting portion 26242 do not interfere with the assembly of the first electrode terminal 23 and the second electrode terminal 24 with the insulating member 26, and the first limiting member and the second limiting portion 26242 can limit the first electrode terminal 23 and the second electrode terminal 24 to move along the third direction relative to the insulating member 26 after the injection molding of the insulating member 26, thereby improving the connection reliability of the first electrode terminal 23 and the second electrode terminal 24 with the insulating member 26.

In some embodiments, as shown in fig. 20, the first stop is disposed opposite the second stop 26242 to define movement of the first and second extensions 232, 242 in the third direction.

In the present embodiment, the two second limiting portions 26242 disposed at the two ends of the insulating member 26 along the second direction are disposed opposite to the two first limiting members disposed at the two sides of the second section 2622 of the first spacing portion 2624, so as to limit both sides of the first extending portion 232 along the second direction and both sides of the second extending portion 242 along the second direction, thereby further improving the connection stability of the first electrode terminal 23 and the second electrode terminal 24 with the insulating member 26.

According to some embodiments of the present application, the fixing member 27 is provided with a protrusion extending in the extending direction of the fixing member 27, the frame 263 is provided with a recess adapted to the protrusion, and the insulating member 26 is connected with the fixing member 27 by a male-female fit of the protrusion and the recess.

The protruding portions of the fixing member 27 may include a plurality of protruding portions and the corresponding recessed portions of the frame 263 may include a plurality of protruding portions and the corresponding recessed portions may be distributed along the extending direction of the frame 263, so that the plurality of recessed portions and the plurality of protruding portions form multi-point connection, stability of connection between the fixing member 27 and the insulating member 26 may be improved, assembly and disassembly of the fixing member 27 and the insulating member 26 are facilitated, and installation difficulty is reduced.

According to some embodiments of the present application, as shown in fig. 8, the fixing member 27 is provided with at least one vent 272 to maintain the air pressure balance inside and outside the fixing member 27 in the case of injection molding, thereby facilitating injection molding of the insulating member 26.

According to some embodiments of the present application, as shown in fig. 10, the insulating member 26 includes two first escape holes 266 spaced apart in the first direction, the two first escape holes 266 are disposed at positions aligned with the first body portion 231 of the first electrode terminal 23 and the second body portion 241 of the second electrode terminal 24, and the two first escape holes 266 are respectively used to escape portions of the first body portion 231 and portions of the second body portion 241, so that portions of the first body portion 231 and portions of the second body portion 241 respectively pass through the two first escape holes 266 and extend into the case 21 to be connected with the tab 221 of the electrode assembly 22.

The apertures of the two first escape holes 266 are adapted to the portions of the first body portion 231 and the second body portion 241, respectively.

Second, as shown in fig. 18, the insulator 26 is connected to the case 21 through an electrode terminal.

The first electrode terminal 23 further includes a first adapter 233, the first adapter 233 is configured to be connected to the first body 231 and the tab 221, respectively, and the second electrode terminal 24 further includes a second adapter 243, the second adapter 243 is configured to be connected to the second body 241 and the tab 221, respectively.

As shown in fig. 19 and 20, the insulating member 26 includes two second avoidance holes 267 spaced apart along the first direction, the two second avoidance holes 267 are disposed at positions aligned with the first and second switching members 233 and 243, the two second avoidance holes 267 are respectively used for avoiding portions of the first switching member 233 and portions of the second switching member 243, the first switching member 233 passes through the corresponding second avoidance hole 267 and is respectively electrically connected with the first main body portion 231 and the first tab 221, and the second switching member 243 passes through the other second avoidance hole 267 and is respectively electrically connected with the second main body portion 241 and the second tab 221.

The first and second adapters 233 and 243 penetrate the insulator 26 and the housing 21 so that the insulator 26 and the housing 21 can be connected.

According to some embodiments of the present application, the second reinforcement portion 245 coincides with at least a portion of the projection of the second adapter 243 in the third direction, and the projection of the second adapter 243 in the third direction may fall within the projection of the second reinforcement portion 245 in the third direction, or a portion of the projection of the second adapter 243 in the third direction falls within the projection of the second reinforcement portion 245 in the third direction, and another portion falls within the projection of the other portion in the third direction, for example, may fall within the projection of the second body portion 241 or the housing 21 in the third direction.

The first reinforcement part 234 is overlapped with at least a part of the projection of the first adapter 233 in the third direction, and the projection of the first adapter 233 in the third direction may fall within the projection of the first reinforcement part 234 in the third direction, or a part of the projection of the first adapter 233 in the third direction falls within the projection of the first reinforcement part 234 in the third direction, and another part falls within the projection of the other part in the third direction, for example, may fall within the projection of the first body part 231 or the housing 21 in the third direction.

The third direction is perpendicular to the second direction and the first direction in pairs.

According to some embodiments of the present application, as shown in fig. 22, the first body 231 and the second body 241 are provided with assembly holes, which may be through holes or blind holes opened toward the housing 21, the assembly holes of the first body 231 are aligned with the second avoidance holes 267 corresponding to the first body 231, and the assembly holes of the second body 241 are aligned with the second avoidance holes 267 corresponding to the second body 241.

The fitting hole of the first body part 231 is connected to the first adapter 233 so that the first electrode terminal 23, the insulator 26 and the case 21 are connected through the first adapter 233, and the fitting hole of the second body part 241 is connected to the second adapter 243 so that the second electrode terminal 24, the insulator 26 and the case 21 are connected through the second adapter 243.

The assembly hole of the first body 231 and the first adapter 233 may be connected by a threaded connection, an inserting connection, or a clamping connection, and the assembly hole of the second body 241 and the second adapter 243 may be connected by a threaded connection, an inserting connection, or a clamping connection.

According to some embodiments of the present application, the first adapter 233 includes a first connection portion and a first body, the first body is disposed in the housing 21 and connected with the corresponding tab, and the first connection portion at least partially penetrates the housing and connects the first main body portion 231 and the first body.

The assembly hole of the first body 231 is used for being connected with the first connection portion, and the assembly hole of the first body 231 and the first connection portion can be connected in a threaded connection, a plug connection or a clamping connection mode.

One of the two second avoidance holes 267 is used for avoiding the first connection portion.

The first connection portion includes a first portion and a second portion, the first portion is a flat plate structure, the assembly hole of the first body portion 231 is a through hole, the second portion passes through the assembly hole of the first body portion 231 and the corresponding second avoiding hole 267 of the insulating member 26 to extend into the housing 21, at least portions of the first body portion 231, the insulating member 26 and the housing 21 are penetrated by the second portion, so as to form an assembly, the first portion is connected with the corresponding tab 221, and the flat plate structure can increase the connection area with the corresponding tab 221, so as to increase the reliability of electrical connection.

As shown in fig. 22, the second adapter 243 includes a second connecting portion 2431 and a second body 2432, the second body 2432 is disposed in the housing 21 and connected to the corresponding tab 221, and the second connecting portion 2431 at least partially penetrates through the housing 21 and connects the second main body 241 and the second body 2432.

The assembly hole of the second body portion 241 is used for being connected with the second connecting portion 2431, and the assembly hole of the second body portion 241 and the second connecting portion 2431 can be connected through a threaded connection, a plug connection, a clamping connection or the like.

Wherein the other of the two second avoidance holes 267 is used for avoiding the second connecting portion 2431.

The first connection portion includes a third portion and a fourth portion, the third portion is a flat plate structure, the assembly hole of the second body portion 241 is a through hole, the fourth portion passes through the assembly hole of the second body portion 241 and the corresponding second avoiding hole 267 of the insulating member 26 to extend into the housing 21, at least portions of the second body portion 241, the insulating member 26 and the housing 21 are all penetrated by the fourth portion, so as to form an assembly, the third portion is connected with the corresponding tab 221, and the flat plate structure can increase the connection area with the corresponding tab 221, so as to increase the reliability of electrical connection.

According to some embodiments of the present application, as shown in fig. 18, the battery cell 20 further includes an insulating sealing ring 28, and the insulating sealing ring 28 is sleeved outside the first connection portion and the second connection portion 2431, respectively.

Wherein, insulating seal ring 28 includes two, and two insulating seal rings 28 are located the outside of first connecting portion and second connecting portion 2431 respectively in the cover.

A leakage channel for communicating the inside and the outside of the housing 21 is formed between the outer peripheral wall of the first connecting part and the housing 21, the corresponding second avoidance hole 267 of the insulating member 26 and the corresponding assembly hole of the first main body 231, and the insulating sealing ring 28 is arranged at the outer side of the first connecting part, so that the leakage channel can be plugged, and the tightness of the battery cell 20 is improved.

A leakage channel communicated with the inside and the outside of the housing 21 is formed between the outer peripheral wall of the second connecting portion 2431 and the housing 21, the corresponding second avoidance hole 267 of the insulating member 26 and the corresponding assembly hole of the second main body portion 241, and the insulating sealing ring 28 is arranged on the outer side of the second connecting portion 2431, so that the leakage channel can be plugged, and the tightness of the battery cell 20 is improved.

According to some embodiments of the present application, there is also provided an electrode terminal including a body portion for coupling with a tab 221, an extension portion for coupling with a bus bar, and a reinforcement portion disposed inside the extension portion, the reinforcement portion having a strength greater than that of the extension portion.

The body portion is used to connect with the tab 221 of the electrode assembly 22, and the body portion may be connected with the tab 221 by welding or the like.

The extension portion is connected with the main body portion, and the extension portion and the main body portion can be connected through an integral molding mode or a welding mode. The extension portion extends outwards from the main body portion, and the extension portion is used for being connected with the confluence piece.

In the present embodiment, by providing the extension portion, the connection area of the electrode terminal and the bus bar can be increased, and the reliability of the electrical connection can be increased.

As shown in fig. 23, the reinforcement is located inside the extension, that is, the reinforcement is disposed in the region between the extension and the housing 21.

The strength of the reinforcing part is not less than that of the extending part, namely the strength of the reinforcing part is greater than or equal to that of the extending part, and the reinforcing part is arranged on the inner side of the extending part, so that the deformation risk of the extending part can be reduced, and the bending strength and the shearing strength of the extending part can be improved.

According to the electrode terminal provided by the embodiment of the application, the extension part of the electrode terminal is not easy to deform or break when bearing external pressure or vibration due to the existence of the reinforcing part, so that the deformation risk of the extension part caused by the large length-width ratio and weak structural strength is reduced, and the overall reliability and safety of the battery cell 20 are improved.

The present application also provides a cap assembly 29, according to some embodiments of the present application, applied to a battery device 100, the cap assembly 29 including a cap body 291 and the electrode terminal of any of the above embodiments.

The case 21 includes a cap plate assembly 29 and a case, and the case and the cap plate assembly 29 form a receiving chamber for receiving the electrode assembly 22.

The electrode terminal is connected to the cap body 291 in an insulating manner, and the electrode terminal is insulated from the cap body 291 by being attached to the insulator 26.

The electrode terminal may be connected to the cap body 291 by a fixing member 27, or may be assembled with the cap body 291 by a snap-fit connection of an adapter.

According to the cover plate assembly 29 provided by the embodiment of the application, by arranging the electrode terminal of any embodiment, the extension part of the electrode terminal is not easy to deform or break when bearing external pressure or vibration due to the existence of the reinforcing part, so that the deformation risk of the extension part due to the fact that the structural strength of the length-width ratio is large is reduced, the reliability of the cover plate assembly 29 is improved, and the overall reliability and safety of the battery cell 20 are improved.

According to some embodiments of the present application, the present application also provides a battery device 100, where the battery device 100 includes a plurality of battery cells 20.

According to the battery device 100 provided by the embodiment of the application, by arranging the battery cell 20 of any embodiment, the battery cell 20 is provided with the electrode terminal, and the extension part of the electrode terminal is not easy to deform or break when bearing external pressure or vibration due to the existence of the reinforcing part, so that the deformation risk of the extension part due to the fact that the length-width ratio is large and the structural strength is weak is reduced, the reliability of the cover plate assembly 29 is improved, the overall reliability and the safety of the battery cell 20 are improved, and the reliability of the battery device 100 is improved.

In some embodiments, the battery device 100 further includes a buss member electrically connected with the extension of the corresponding battery cell 20.

Wherein the bus bar is used for the electrical connection of two or more battery cells 20.

For example, the bus bar may electrically connect adjacent two battery cells 20, and the plurality of bus bars may electrically connect a plurality of battery cells 20 in the battery device 100.

The number of the bus members may be plural, and each of the plurality of bus members is electrically connected with at least two battery cells 20 to electrically connect the plurality of battery cells.

According to some embodiments of the present application, the present application further provides an energy storage device 1, including a plurality of the battery cells 20 of any of the above embodiments or a plurality of the battery devices 100 of any of the above embodiments, where the battery cells 20 or the battery devices 100 are used to store or provide electrical energy.

According to the energy storage device 1 provided by the embodiment of the present application, by providing a plurality of the battery cells 20 of any one of the above embodiments or a plurality of the battery devices 100 of any one of the above embodiments, the reliability and safety of the energy storage device 1 can be improved.

According to some embodiments of the present application there is also provided an energy storage system comprising a power conversion device for electrically connecting a power generating apparatus 3 and an energy storage device 1 as in the above embodiments and an energy storage device 1.

According to the energy storage system provided by the embodiment of the application, the reliability and the safety of the energy storage system can be improved by arranging a plurality of the energy storage devices 1 of any one embodiment.

According to some embodiments of the present application, there is also provided an electrical device comprising a battery cell 20 as in any of the embodiments described above, a battery device 100 as in any of the embodiments described above, an energy storage device 1 as in any of the embodiments described above, or an energy storage system as in any of the embodiments described above.

The battery cell 20 is used to store or provide electrical energy, the battery device 100 is used to store or provide electrical energy, the battery cell 20 or the battery device 100 is used to store or provide electrical energy, and the battery cell 20 or the battery device 100 is used to store or provide electrical energy.

The powered device may be any of the devices or systems described above that employ battery device 100.

According to the energy storage system provided by the embodiment of the application, the reliability and the safety of the power utilization device can be improved by arranging the battery cell 20 of any one embodiment, the battery device 100 of any one embodiment, the energy storage device 1 of any one embodiment or the energy storage system of any one embodiment.

According to some embodiments of the present application, the present application also provides a charging network comprising a charging pile 4 and an energy storage device 1 according to any of the embodiments described above or an energy storage system according to any of the embodiments described above, the energy storage device 1 being adapted to provide electrical energy to the charging pile 4.

According to the charging network provided by the embodiment of the application, the reliability and the safety of the charging network can be improved by arranging the energy storage device 1 of any embodiment or the energy storage system of any embodiment.

The energy storage device 1 may be located inside the charging pile 4 (for example, a storage and charging integrated machine), or may be located outside the charging pile 4.

The battery cell 20 of the present application is described below in two specific examples.

In a first embodiment, the present application provides a battery cell 20, where the battery cell 20 includes a case 21, an electrode assembly 22, an insulating member 26, a fixing member 27, a first electrode terminal 23, and a second electrode terminal 24, and the first electrode terminal 23 and the second electrode terminal 24 are integrally formed.

The insulating member 26 includes an insulating plate 261, a spacer 262, and a frame 263, and the frame 263, the insulating plate 261, and the spacer 262 form a first receiving cavity 264 for receiving the first electrode terminal 23 and a second receiving cavity 265 for receiving the second electrode terminal 24. The insulating plate 261 serves for insulation between the first electrode terminal 23 and the case 21 and between the second electrode terminal 24 and the case 21, and the spacer 262 serves for insulation between the first electrode terminal 23 and the second electrode terminal 24.

In this embodiment, the insulating member 26 is an injection molding member, the first electrode terminal 23 and the second electrode terminal 24 are placed in a plastic molding mold, and the thermoplastic or thermosetting material is injected into the plastic molding mold to form the insulating member 26, so that the first electrode terminal 23, the second electrode terminal 24 and the insulating member 26 form a component, and the component formed by the first electrode terminal 23, the second electrode terminal 24 and the insulating member 26 can be assembled with the housing 21 integrally, thereby reducing the installation difficulty.

The fixing member 27 may be sleeved with the frame 263 of the insulating member 26, the fixing member 27 is connected with the cap plate body 291 of the housing 21 by welding, and at least portions of the first electrode terminal 23 and the second electrode terminal 24 sequentially pass through the insulating member 26 and the fixing member 27 and extend into the housing 21 to be connected with the tab 221 of the electrode assembly 22.

In a second embodiment, the present application provides a battery cell 20, where the battery cell 20 includes a housing 21, an electrode assembly 22, an insulating member 26, a first electrode terminal 23 and a second electrode terminal 24, and the first electrode terminal 23 and the second electrode terminal 24 are in a split structure.

The first electrode terminal 23 further includes a first adapter 233, the first adapter 233 being for electrical connection with the first body portion 231 and the tab 221, respectively, and the second electrode terminal 24 further includes a second adapter 243, the second adapter 243 being for electrical connection with the second body portion 241 and the tab 221, respectively, and the insulating member 26 being connected with the case 21 through the first adapter 233 and the second adapter 243.

The battery unit 20 further comprises two insulating sealing rings 28, the two insulating sealing rings 28 are respectively sleeved outside the first connecting part and the second connecting part 2431, so that leakage channels outside the first connecting part and the second connecting part 2431 can be plugged, and the tightness of the battery unit 20 is improved.

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.

The above is only a preferred embodiment of the present application, and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

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

The outer casing, including the walls;

An electrode assembly is installed within the housing, the electrode assembly including tabs;

An electrode terminal is disposed on the housing. The electrode terminal includes a main body, an extension, and a reinforcing portion. The main body is electrically connected to the tab. The extension protrudes from the main body along a first direction, which is perpendicular to the thickness direction of the wall. The extension is connected to the main body and electrically connected to a busbar. The reinforcing portion is at least partially disposed on the side of the extension facing the wall.

2. The battery cell according to claim 1, characterized in that the two electrode terminals include a first electrode terminal and a second electrode terminal that are insulated from each other, wherein the main body, the extension, and the reinforcing part of the first electrode terminal are respectively a first main body, a first extension, and a first reinforcing part, and the main body, the extension, and the reinforcing part of the second electrode terminal are respectively a second main body, a second extension, and a second reinforcing part, wherein the first main body and the second main body are arranged along a first direction, the first extension and the second extension are arranged along a second direction, the first direction is perpendicular to the second direction, the first reinforcing part is disposed between the first extension and the wall portion, and the second reinforcing part is disposed between the second extension and the wall portion.

3. The battery cell according to claim 2, characterized in that,

The first electrode terminal further includes a first protrusion that at least partially extends to the side of the second extension opposite to the housing. The second reinforcement at least partially coincides with the projection of the first protrusion along a third direction, which is perpendicular to both the first and second directions; and/or,

The second electrode terminal further includes a second protrusion that extends at least partially to the side of the first extension away from the housing. The first reinforcement and the projection of the second protrusion along the third direction at least partially coincide, and the third direction is perpendicular to both the first direction and the second direction.

4. The battery cell according to claim 3, wherein the side of the first main body portion facing the second extension portion is connected to the first protrusion portion, and the side of the second main body portion facing the first extension portion is connected to the second protrusion portion.

5. The battery cell according to claim 3 or 4, wherein the battery cell further comprises: an insulating member, the insulating member being at least partially disposed between each pair of the first electrode terminal, the second electrode terminal and the outer casing.

6. The battery cell according to claim 5, wherein the insulating member is at least partially disposed on the outer casing.

7. The battery cell according to claim 5 or 6, wherein the insulating member comprises:

An insulating plate, wherein the first electrode terminal and the second electrode terminal are spaced apart and mounted on the insulating plate, and the insulating plate is at least partially disposed between the first reinforcing part and the outer shell and between the second reinforcing part and the outer shell;

A spacer is connected to the insulating plate and is arranged between the first electrode terminal and the second electrode terminal.

8. The battery cell according to claim 7, wherein the spacer comprises a first segment, a second segment and a third segment connected in sequence, the first segment being located between the first main body and the second extension, the second segment being located between the first extension and the second extension, and the third segment being located between the first extension and the second main body.

9. The battery cell according to claim 8, wherein the projections of the first protrusion, the first segment, and the second extension in a third direction at least partially overlap, and a portion of the first segment is sandwiched between the first protrusion and the second extension;

The projections of the first extension, the third segment, and the second protrusion along a third direction at least partially overlap, and a portion of the third segment is sandwiched between the first extension and the second protrusion.

10. The battery cell according to claim 8 or 9, wherein the length of the first protrusion along the second direction is less than the length of the first segment along the second direction, and the length of the second protrusion along the second direction is less than the length of the third segment along the second direction.

11. The battery cell according to any one of claims 8-10, wherein the spacer comprises a first spacer portion and a second spacer portion distributed along a third direction, the height of the first spacer portion along the third direction being no greater than the height of the first electrode terminal and the second electrode terminal, and the height of the second spacer portion along the third direction being greater than the height of the first electrode terminal and the second electrode terminal.

12. The battery cell according to claim 11, wherein the second segment of the second spacer has at least one positioning portion for cooperating with a busbar.

13. The battery cell according to claim 11 or 12, wherein the second segment of the first spacer has at least one first limiting portion, the first limiting portion engaging with the first extension and the second extension to limit the degree of freedom of the first extension and the second extension in a third direction.

14. The battery cell according to any one of claims 2-13, wherein the battery cell further comprises: a fixing member, the fixing member being at least partially disposed on the side of the first electrode terminal and the second electrode terminal facing away from the housing, and the fixing member being connected to the housing.

15. The battery cell according to claim 14, wherein the battery cell includes an insulating member, the insulating member being at least partially disposed between the electrode terminal and the fixing member.

16. The battery cell according to claim 15, wherein the insulating member is at least partially disposed on the outer periphery of the fixing member.

17. The battery cell according to any one of claims 2-13, characterized in that the first electrode terminal further includes a first adapter, the first adapter being connected to the first main body and the tab respectively, the first reinforcing portion coinciding with at least a portion of the projection of the first adapter along the third direction, the third direction being perpendicular to both the first direction and the second direction; the second electrode terminal further includes a second adapter, the second adapter being connected to the second main body and the tab respectively, the second reinforcing portion coinciding with at least a portion of the projection of the second adapter along the third direction, the third direction being perpendicular to both the first direction and the second direction.

18. The battery cell according to claim 17, wherein the first adapter includes a first connecting portion and a first body, the first body is disposed inside the housing and connected to the tab, and the first connecting portion at least partially passes through the housing and connects the first body portion and the first body.

The second adapter includes a second connecting portion and a second body. The second body is disposed inside the housing and connected to the electrode tab. The second connecting portion at least partially passes through the housing and connects the second body portion and the second body.

19. The battery cell according to claim 18, wherein the battery cell further comprises an insulating sealing ring, the insulating sealing ring being respectively sleeved on the outside of the first connecting portion and the second connecting portion.

20. The battery cell according to any one of claims 1-19, wherein the reinforcing portion extends at least partially to the side of the main body portion facing the outer casing.

21. The battery cell according to any one of claims 1-20, characterized in that the extension portion is formed with a mounting groove on the side facing the housing, and the reinforcing portion is at least partially disposed in the mounting groove.

22. The battery cell according to any one of claims 1-21, wherein the thickness W of the reinforcing portion satisfies: 0.1mm ≤ W ≤ 1mm.

23. The battery cell according to any one of claims 1-22, wherein the reinforcing portion is thermally bonded to the extension portion; or, the reinforcing portion is disposed between the extension portion and the outer casing.

24. The battery cell according to any one of claims 1-23, wherein the electrode terminal is a positive electrode terminal, the reinforcing portion is a copper layer, and the strength of the reinforcing portion is greater than the strength of the extension portion.

25. A cover plate assembly, characterized in that it is applied to a battery device, wherein the electrode terminals of the battery cell as described in any one of claims 1-24 are disposed in the cover plate assembly.

26. A battery device, characterized in that it comprises: a plurality of battery cells according to any one of claims 1-24.

27. The battery cell according to claim 26, characterized in that it further comprises a busbar, the busbar being electrically connected to an extension of the corresponding battery cell.

28. An electrical device, characterized in that it comprises: a battery cell as described in any one of claims 1-24, and a battery device as described in claim 26, wherein the battery cell or the battery device is used to store or provide electrical energy.