CN219658932U

CN219658932U - Battery monomer, battery and power consumption device

Info

Publication number: CN219658932U
Application number: CN202321406429.1U
Authority: CN
Inventors: 周丹凤; 周文林
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2023-06-05
Filing date: 2023-06-05
Publication date: 2023-09-08
Anticipated expiration: 2033-06-05

Abstract

The application relates to the field of batteries, and provides a battery monomer, a battery and an electricity utilization device. The battery cell comprises an end cover and at least one switching piece arranged on the inner side of the end cover. At least one adapter piece is provided with a first surface facing the end cover, and a local area of the first surface is provided with a first insulating layer. The battery monomer can be provided with the first insulating layer in the local area of the first surface of the at least one switching sheet facing the end cover, so that the area, covered by the first insulating layer, of the switching sheet is insulated and isolated by the first insulating layer, the insulativity between the area, covered by the first insulating layer, of the switching sheet and the end cover can be improved, the metal wire can be reliably blocked through the first insulating layer, the area, covered by the first insulating layer, of the switching sheet and the end cover can be blocked from being accidentally conducted by the metal wire, and the risk of corrosion and liquid leakage phenomena of the end cover due to electrochemical reaction can be reduced.

Description

Battery monomer, battery and power consumption device

Technical Field

The application belongs to the technical field of batteries, and particularly relates to a battery monomer, a battery and an electric device.

Background

In some cases, the battery cell includes an end cap, an electrode assembly, and electrode terminals disposed on the end cap, and tabs of the electrode assembly are connected with the corresponding electrode terminals through the switching tab. However, during the production, assembly, wires may be produced. During use of the battery cell, the wire may accidentally pass through the switching piece and the end cover, resulting in corrosion and leakage of the end cover due to electrochemical reaction.

Disclosure of Invention

The embodiment of the utility model provides a battery cell, a battery and an electricity utilization device, which are used for solving the problem that a metal wire can accidentally conduct a switching piece and an end cover during the use of the battery cell, so that the end cover is corroded and leaked due to electrochemical reaction.

In order to achieve the above purpose, the technical scheme adopted by the embodiment of the utility model is as follows:

in a first aspect, a battery cell is provided, including an end cover, and at least one adapter piece disposed inside the end cover, the at least one adapter piece having a first surface facing the end cover, and a local area of the first surface being provided with a first insulating layer.

According to the battery cell provided by the embodiment of the utility model, the first insulating layer is arranged on the local area of the at least one switching piece, which faces the first surface of the end cover, so that the area, covered by the first insulating layer, of the switching piece is insulated and isolated by the first insulating layer, the insulativity between the area, covered by the first insulating layer, of the switching piece and the end cover is improved, the metal wire can be reliably blocked by the first insulating layer, the area, covered by the first insulating layer, of the switching piece and the end cover are blocked from being accidentally conducted by the metal wire, and the risk of corrosion and liquid leakage phenomena of the end cover due to electrochemical reaction can be reduced.

In some embodiments, the end cap is provided with a mounting hole, and the battery cell further includes an electrode terminal correspondingly mounted to the mounting hole;

the first surface is provided with a first connecting region correspondingly connected with the electrode terminal and a first free region positioned outside the first connecting region, and at least a partial region of the first free region is provided with a first insulating layer.

By adopting the scheme, the at least one switching piece can construct stable and reliable electric connection relation with the electrode terminal through the first connection area of the first surface so as to reliably and effectively exert the current collecting effect. On the basis, the first insulating layer is arranged on a local or whole area of the first free area of the first surface of the switching piece, so that on the basis of ensuring the current collecting effect, the insulativity between the switching piece and the end cover is effectively improved through the first insulating layer, the risk that the switching piece and the end cover are accidentally conducted by metal wires is effectively reduced, and the risk that the end cover corrodes and leaks due to electrochemical reaction is effectively reduced.

In some embodiments, the adapter piece has a protrusion protruding toward the electrode terminal, the protrusion penetrating through the mounting hole and connecting the electrode terminal.

Through adopting above-mentioned scheme, the boss that the extension piece accessible was set up towards electrode terminal one side protrusion wears to locate corresponding mounting hole to laminate the electricity with the terminal surface of corresponding electrode terminal and be connected, and conveniently, swiftly establish the electricity between extension piece and the electrode terminal and be connected, and guarantee the stability and the reliability of electricity between extension piece and the electrode terminal. In addition, based on the arrangement, a certain gap is formed between other areas of the switching piece, which are not connected with the electrode terminals, and the end covers, so that the insulation between the switching piece and the end covers can be ensured and improved, and the risk of the end covers that the liquid leakage phenomenon is corroded due to electrochemical reaction can be reduced.

In some embodiments, the first connection region is located on an end face of the protrusion near the electrode terminal, the first free region has an insulation region disposed around the first connection region, the insulation region is located on the protrusion, an outer edge of the insulation region is located outside an edge of the protrusion, and the insulation region is provided with a first insulation layer.

By adopting the scheme, at least one switching piece can be electrically connected with the end face of the corresponding electrode terminal in a fitting way through the first connecting area positioned on the end face of the convex part close to the electrode terminal, so that the electric connection between the switching piece and the electrode terminal can be conveniently, quickly, stably and reliably constructed. On the basis, the first insulating layer is arranged on the insulating region which basically comprises the region except the first connecting region, so that the insulating region is reliably insulated and isolated and protected through the first insulating layer, the insulation between the insulating region of the switching piece, particularly the convex part, and the end cover can be improved, the risk that the metal wire is accidentally conducted on the insulating region of the switching piece, particularly the convex part and the end cover can be effectively reduced, and the risk that the end cover corrodes and leaks due to electrochemical reaction can be effectively reduced.

In some embodiments, the battery cell further includes an insulating member, the insulating member is mounted on a side of the end cover, which is close to the switching piece, and a through hole is formed in a position of the insulating member corresponding to the mounting hole.

Through adopting above-mentioned scheme, the accessible is installed in the insulating part that the end cover is close to adapter piece one side, on the basis that the adapter piece of being convenient for sees through corresponding wearing to establish hole and mounting hole and corresponds electrode terminal electricity and be connected, guarantee the electrical insulation between electric connecting elements such as end cover and electrode assembly, adapter piece on a large scale, and reliably reduce the risk of short circuit. And the insulator can also combine the first insulating layer on the switching piece, blocks the wire from switching on the end cover and the switching piece jointly to the risk that the wire accidentally switches on the end cover and the switching piece can be reduced to a great extent. Therefore, the risk of corrosion and leakage of the end cover due to electrochemical reaction can be effectively reduced.

In some embodiments, the insulating member includes an insulating ring portion disposed in a ring shape, and the insulating ring portion is connected to a hole edge of the through hole and is disposed through the mounting hole.

Through adopting above-mentioned scheme, the insulating part not only can carry out insulating isolation protection to the inboard of end cover, still accessible is connected in the hole edge of wearing to establish the hole and wears to locate the insulating ring portion of mounting hole, also forms certain insulating isolation protection to the pore wall of mounting hole. Based on this, the insulating part can reliably ensure the electrical insulation between the pore wall of the mounting hole and the electrical connection part in the mounting hole (namely, the electrical connection part between the electrode terminal and the switching piece) through the insulating ring part, thereby reliably reducing the risk of short circuit, reliably preventing the accidental conduction of the metal wire through the pore wall of the mounting hole and the electrical connection part in the mounting hole, and reliably reducing the risk of the corrosion and liquid leakage phenomenon of the end cover due to electrochemical reaction.

In some embodiments, the projected inner loop of the insulating ring on the first surface is a first loop along the axial direction of the through hole;

the first free region is provided with an insulating region arranged around the first connecting region, the outer edge of the insulating region is positioned on the outer side of the first loop line, and the insulating region is provided with a first insulating layer.

By adopting the scheme, on the basis that the insulating ring part guarantees the electrical insulation between the hole wall of the mounting hole and the electrical connection part in the mounting hole, at least one adapter piece can also divide the insulating area on the periphery side of the first connection area, and the outer edge of the insulating area is positioned on the outer side of the first loop line, so that the setting range of the insulating area is partially overlapped with the projection range of the insulating ring part on the first surface. Based on the structure, the insulation protection range of the first insulation layer arranged on the insulation area can be ensured, and the insulation protection range of the first insulation layer can be mutually overlapped and complemented with the insulation protection range of the insulation ring part. Therefore, the comprehensive insulation isolation protection effect of the first insulation layer on the insulation area and the insulation piece can be guaranteed and enhanced, the metal wire can be effectively prevented from conducting the end cover and the switching piece, the risk that the metal wire is accidentally conducted on the end cover and the switching piece can be greatly reduced, and the risk that the end cover corrodes and leaks due to electrochemical reaction can be effectively reduced.

In some embodiments, the spacing between the outer edge of the insulating region and the first loop line is greater than or equal to 5 millimeters (mm).

Through adopting above-mentioned scheme, the outward flange of accessible messenger's insulating region is located the outside of first loop wire to make the interval between the outward flange of insulating region and the first loop wire be greater than or equal to 5mm, and make the setting scope of insulating region and the projection scope of insulating ring portion on first surface form the overlap of a certain extent, thereby can optimize the comprehensive insulation isolation protection effect of first insulating layer on the insulating region and insulating part, can effectively hinder wire to switch on end cover and changeover piece, thereby can effectively reduce the risk that the unexpected end cover and the changeover piece of switching on of wire, can effectively reduce the risk that the end cover appears corroding the weeping phenomenon because of producing electrochemical reaction.

In some embodiments, the spacing between the insulating ring portion and the end face of the electrode terminal is 0mm to 1mm.

Through adopting above-mentioned scheme, the interval between the terminal surface of accessible messenger's insulating ring portion and electrode terminal is 0mm ~1mm to ensure that insulating ring portion has sufficient height in the direction that is close to electrode terminal, thereby can enlarge insulating isolation protection scope of insulating ring portion, can strengthen insulating isolation protection effect of insulating ring portion to the pore wall of mounting hole, can strengthen insulating ring portion's barrier effect to the wire, thereby can effectively reduce the risk that the unexpected switch on end cover of wire and change piece, can effectively reduce the risk that the end cover appears corroding the weeping phenomenon because of producing electrochemical reaction.

In some embodiments, the battery cell further includes a sealing ring mounted to the hole edge of the mounting hole and sealingly connected between the end cap and the electrode terminal.

Through adopting above-mentioned scheme, battery monomer accessible is installed in the sealing washer of the hole edge of mounting hole, reliably seals between end cover and electrode terminal, especially reliably seals between the hole edge of mounting hole and electrode terminal to can ensure and improve battery monomer's sealing performance and sealing reliability, can reduce the risk of battery monomer weeping.

In some embodiments, the seal ring includes a seal ring portion disposed in a ring shape, the seal ring portion penetrating the mounting hole;

in the radial direction of the mounting hole, the projection of the insulating ring portion overlaps with the projection portion of the seal ring portion.

By adopting the scheme, the projection of the insulating ring part of the insulating piece is overlapped with the projection part of the sealing ring in the radial direction of the mounting hole, so that the insulating ring part and the sealing ring part can form overlapping in the radial direction of the mounting hole. Based on this, can increase the tortuosity degree and the length of clearance route between insulating ring portion and the sealing ring portion, can strengthen insulating ring portion and sealing ring portion and jointly to the hindrance effect of wire, can ensure that insulating ring portion and sealing ring portion can jointly reliably hinder the clearance route between the insulating ring portion and the sealing ring portion of wire to can effectively reduce the risk that the unexpected switch-on end cover of wire and change piece, can effectively reduce the risk that the end cover appears corroding the weeping phenomenon because of producing electrochemical reaction.

In some embodiments, the insulating ring portion includes a first ring segment connected to the rim of the through hole, the first ring segment being in an interference fit with the seal ring portion.

Through adopting above-mentioned scheme, insulating ring portion accessible first ring section and sealing ring portion interference fit, and the clearance route between reliable shutoff sealing ring portion and the insulating ring portion especially first ring section to can effectively, reliably hinder the clearance route between the metal wire through sealing ring portion and insulating ring portion especially first ring section, can effectively reduce the risk that the unexpected end cover of switching on of metal wire and change piece, can effectively reduce the risk that the end cover appears corroding weeping phenomenon because of producing electrochemical reaction.

In some embodiments, the insulating ring portion further comprises a second ring segment connected to an end of the first ring segment adjacent the seal ring portion, the second ring segment having a width less than a width of the first ring segment, the second ring segment being in clearance fit with the seal ring portion.

Through adopting above-mentioned scheme, insulating ring portion accessible width is less second ring segment and sealing ring portion clearance fit, and reduces the cooperation resistance between insulating ring portion and the sealing ring portion to can improve the cooperation convenience and the cooperation reliability between insulating ring portion and the sealing ring portion.

Through adopting above-mentioned scheme, insulating ring portion accessible width is great first ring section and sealing ring portion interference fit, and the clearance route between sealing ring portion and the insulating ring portion especially first ring section of reliable shutoff, and on this basis, form the ladder structure through second ring section and first ring section, and the tortuous degree of clearance route between insulating ring portion and the sealing ring portion is reliably increased, thereby can effectively, reliably hinder the clearance route between metal wire through sealing ring portion and the insulating ring portion, can effectively reduce the risk that the unexpected end cover of switching on of metal wire and change piece, can effectively reduce the risk that the end cover appears corroding the weeping phenomenon because of producing electrochemical reaction.

In some embodiments, at least one of the tabs has a second surface facing away from the end cap, and a localized area of the second surface is provided with a second insulating layer.

Through adopting above-mentioned scheme, at least one changeover piece accessible sets up the second insulating layer in its local region that deviates from the second surface of end cover to carry out insulating isolation protection to the region that this changeover piece was covered by the second insulating layer through the second insulating layer, thereby can improve the insulating nature between this changeover piece and end cover, the casing that is covered by the second insulating layer, can hinder the wire reliably through the second insulating layer, with hinder the unexpected region that switches on the changeover piece and cover or the casing that are covered by the second insulating layer of wire, thereby can reduce end cover and casing and the risk that the corruption weeping phenomenon appears because of producing electrochemical reaction.

In some embodiments, the battery cell further comprises an electrode assembly disposed on a side of the adapter plate facing away from the end cap, the electrode assembly having a tab connected to the adapter plate;

the second surface is provided with a second connecting area correspondingly connected with the tab and a second free area outside the second connecting area, and at least a partial area of the second free area is provided with a second insulating layer.

By adopting the scheme, the at least one switching piece can construct stable and reliable electric connection relation with the electrode lug of the electrode assembly through the second connection area of the second surface so as to reliably and effectively exert the current collecting effect. On the basis, the second insulating layer is arranged on a part or all of the second free region of the second surface of the switching sheet, so that on the basis of ensuring the current collecting effect, the insulativity between the switching sheet and the end cover and between the switching sheet and the shell is effectively improved through the second insulating layer, the risk that the switching sheet is accidentally conducted by metal wires and the end cover or the shell can be effectively reduced, and the risk that the end cover and the shell are corroded and leaked due to electrochemical reaction can be effectively reduced.

In some embodiments, the first insulating layer has a thickness of 0.01mm to 0.2mm.

Through adopting above-mentioned scheme, the thickness of accessible messenger's first insulating layer is 0.01mm ~0.2mm to ensure that first insulating layer has certain insulating isolation protection effect, and can reduce the first insulating layer and to the influence of increasing of the occupation space of changeover piece, can reduce the cost of changeover piece.

In some embodiments, the first insulating layer is a polymeric insulating layer or a composite layer comprising polymeric insulating material.

By adopting the scheme, the first insulating layer is made to be a polymer insulating layer or a composite layer containing a polymer insulating material, so that the first insulating layer has the characteristics of the polymer insulating material and has excellent insulativity.

In a second aspect, a battery is provided, where the battery includes a battery cell provided by an embodiment of the present application.

By adopting the scheme, the battery can reduce the risk of short circuit and the risks of battery damage, corrosion and liquid leakage by applying the battery monomer provided by the embodiment of the application, thereby guaranteeing and prolonging the service life of the battery.

In a third aspect, an electrical device is provided, where the electrical device includes a battery provided by an embodiment of the present application, or a battery cell provided by an embodiment of the present application.

By adopting the scheme, the power utilization device can ensure and improve the performance, the use safety and the service life of the power utilization device by applying the battery or the battery monomer provided by the embodiment of the application.

Drawings

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

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

fig. 2 is an exploded view of a battery according to an embodiment of the present application;

fig. 3 is an exploded view of a battery cell according to an embodiment of the present application;

fig. 4 is a schematic structural view of an assembly of an end cap and an electrode terminal according to an embodiment of the present application;

FIG. 5 is a cross-sectional view taken along line A-A provided in FIG. 4;

FIG. 6 is an enlarged view of region B provided in FIG. 5;

fig. 7 is a schematic structural view of a switch board according to an embodiment of the application, in which a first insulating layer is disposed in a partial area of a first surface of the switch board;

FIG. 8 is a cross-sectional view taken along line C-C provided in FIG. 7;

fig. 9 is a schematic view illustrating the matching of an end cap, an electrode terminal, an insulating member, a switching piece, and a seal ring according to another embodiment of the present application, wherein an insulating ring portion includes a second ring segment;

FIG. 10 is an enlarged view of region D provided in FIG. 9;

fig. 11 is a schematic structural view of a switching piece according to another embodiment of the present application, in which a second insulating layer is disposed in a partial area of a second surface of the switching piece.

Wherein, each reference sign in the figure:

1-battery, 2-controller, 3-motor; 100-battery unit, 200-box, 201-first part, 202-second part;

10-battery cell, 11-shell; 12-end caps, 121-mounting holes; 13-electrode terminal, 131-positive terminal, 132-negative terminal; 14-insulating parts, 141-penetrating holes, 142-insulating ring parts, 1421-first ring sections, 1422-second ring sections; 15-switching piece, 151-positive electrode switching piece, 152-negative electrode switching piece; 153-first surface, 1531-first connection region, 1532-first free region, 15321-insulating region, 154-first insulating layer, 155-protrusion, 156-second surface, 1561-second connection region, 1562-second free region, 157-second insulating layer; 16-electrode assembly, 161-main body part, 162-tab, 1621-positive tab, 1622-negative tab; 17-sealing ring, 171-sealing ring part.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved by the application clear, the application is described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.

In the description of the present application, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the 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 battery cell is the smallest unit that stores and outputs electrical energy. In some cases, the battery cell includes an end cap, an electrode assembly, and an electrode terminal disposed on the end cap. The end cover is matched with other components to jointly form the internal environment of the battery cell, and the formed internal environment of the battery cell is isolated from the external environment and can be used for accommodating components such as an electrode assembly. The electrode assembly is a component in which electrochemical reactions occur in the battery cells. The electrode assembly includes a positive electrode tab, a negative electrode tab, and a separator separating the positive electrode tab and the negative electrode tab. The positive electrode sheet, separator and negative electrode sheet may be wound, laminated or otherwise processed to form an electrode assembly. In the electrode assembly, the parts of the positive electrode pole piece and the negative electrode pole piece, which are provided with active substances, form a main body part of the electrode assembly, the parts of the positive electrode pole piece and the negative electrode pole piece, which are not provided with active substances, respectively form a tab, and the tab is a current transmission end of the electrode assembly and is used for transmitting current. The tab of the positive pole piece is a positive pole tab, the tab of the negative pole piece is a negative pole tab, and the positive pole tab and the negative pole tab can be located at one end of the main body part together or located at two ends of the main body part respectively. Electrode terminals are provided on the end caps, and the electrode terminals may be used to be electrically connected with tabs of the electrode assembly for outputting or inputting electric power. In some cases, the tabs of the electrode assembly are electrically connected with the corresponding electrode terminals through the switching tabs, i.e., the switching tabs are current collecting members connected between the electrode terminals and the tabs of the electrode assembly.

However, during production, assembly, wires may be created from the process, from the end cap stock, or in any other form. During use of the battery cell, the wire may accidentally pass through the switching piece and the end cover, resulting in corrosion and leakage of the end cover due to electrochemical reaction.

Therefore, some embodiments of the present application provide a battery cell, where at least one tab is provided with a first insulating layer in a local area of a first surface of the tab facing the end cover, so that the area of the tab covered by the first insulating layer is insulated and isolated by the first insulating layer, thereby improving insulation between the area of the tab covered by the first insulating layer and the end cover, and reliably blocking a metal wire through the first insulating layer, so as to prevent the metal wire from accidentally conducting the area of the tab covered by the first insulating layer and the end cover, and thus reduce risk of corrosion and leakage phenomena of the end cover due to electrochemical reaction.

The battery cell disclosed by the embodiment of the application can be a lithium ion secondary battery, a lithium sulfur battery, a sodium-lithium ion battery, a sodium ion battery or a magnesium ion battery and the like. The battery cells may be cylindrical, flat, rectangular, or otherwise shaped, among others. The battery cells can be packaged in different ways to form cylindrical battery cells, square battery cells or soft package battery cells, etc.

The battery cells disclosed by the embodiment of the application can be independently used, and can also be matched with other battery cells to form a modularized battery capable of providing higher voltage and capacity, such as a battery module, a battery module or a battery pack.

The battery cell and the battery disclosed by the embodiment of the application can be used for an electric device using the battery cell and the battery as power sources or various energy storage systems using the battery cell and the battery as energy storage elements. The powered device may be, but is not limited to, a vehicle, a cell phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle and the like. Spacecraft include airplanes, rockets, space planes, spacecraft, and the like. The electric toy includes fixed or mobile electric toys such as a game machine, an electric car toy, an electric ship toy, and an electric airplane toy, and the like. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete shakers, and electric planers, among others.

In order to explain the technical scheme provided by the application, the following is a detailed description taking an electric device as a vehicle as an example with reference to the specific drawings and embodiments.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle according to some embodiments of the application. The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle and the like. The interior of the vehicle is provided with a battery 1, and the battery 1 may be provided at the bottom or at the head or at the tail of the vehicle. The battery 1 is used to supply power to the vehicle, for example, the battery 1 may serve as an operating power source for the vehicle. The vehicle may further comprise a controller 2 and a motor 3, the controller 2 being arranged to control the battery 1 to power the motor 3, for example for starting, navigating and operating power requirements of the vehicle.

In some embodiments of the application, the battery 1 may be used not only as an operating power source for a vehicle, but also as a driving power source for a vehicle, instead of or in part instead of fuel oil or natural gas, to provide driving power for the vehicle.

Referring to fig. 2, fig. 2 is an exploded view of a battery 1 according to some embodiments of the present application. The battery 1 includes a battery cell 100 and a case 200, and the battery cell 100 is accommodated in the case 200. The case 200 is used to provide an accommodating space for the battery unit 100, and the case 200 may have various structures. In some embodiments, the case 200 may include a first portion 201 and a second portion 202, the first portion 201 and the second portion 202 being overlapped with each other, the first portion 201 and the second portion 202 together defining an accommodating space for accommodating the battery cell 100. The second portion 202 may be a hollow structure with an opening at one end, the first portion 201 may be a plate-shaped structure, and the first portion 201 covers the opening side of the second portion 202, so that the first portion 201 and the second portion 202 together define an accommodating space; the first portion 201 and the second portion 202 may also be hollow structures with one side open, and the open side of the first portion 201 is engaged with the open side of the second portion 202. Of course, the case 200 formed by the first portion 201 and the second portion 202 may be of various shapes, such as a cylinder, a rectangular parallelepiped, etc.

In the battery 1, the plurality of battery units 100 may be provided, and the plurality of battery units 100 may be connected in series, in parallel, or in series-parallel, where the series-parallel connection means that the plurality of battery units 100 are connected in both series and parallel.

Specifically, the battery cell 100 may be a battery cell 10 (as shown in fig. 3). The plurality of battery cells 10 can be directly connected in series, in parallel or in series-parallel, and then the whole body formed by the plurality of battery cells 10 is accommodated in the box body 200. The battery cell 10 may be a lithium ion secondary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like. The battery cell 10 may be in the shape of a cylinder, a flat body, a rectangular parallelepiped, or other shapes, etc. The battery cell 10 may be packaged in various ways to form a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or the like.

Alternatively, the battery cell 100 may be a battery module or a battery module. The plurality of battery cells 10 may be connected in series or parallel or series-parallel to form a modular structure, i.e., a battery module or a battery module; the plurality of battery modules or the battery modules are connected in series or in parallel or in series-parallel to form a whole and are accommodated in the case 200.

Of course, the battery 1 may also include other structures, for example, the battery 1 may also include a bus member (not shown in the drawings) for making electrical connection between the plurality of battery cells 100.

Of course, in some embodiments, the battery 1 may not include the case 200, but a plurality of battery cells 10 may be electrically connected and integrated by a necessary fixing structure to be assembled into the power consumption device.

Referring to fig. 3, fig. 3 is an exploded view of a battery cell 10 according to some embodiments of the application. The battery cell 10 is the smallest unit that stores and outputs electric energy. The battery cell 10 includes a case 11, an end cap 12, an electrode terminal 13, an insulator 14, a tab 15, an electrode assembly 16, an electrolyte (not shown), and the like.

The end cap 12 refers to a member that is covered at the opening of the case 11 to isolate the internal environment of the battery cell 10 from the external environment. In some embodiments, the shape of the end cap 12 may be adapted to the shape of the housing 11 to fit the housing 11. In some embodiments, the end cap 12 may be made of a material having a certain hardness and strength, so that the end cap 12 is not easy to deform when being extruded and collided, so that the battery cell 10 can have a higher structural strength, and the safety performance can be improved. The material of the end cap 12 may be varied, and the end cap 12 may be made of copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. In some embodiments, electrode terminals 13 may be provided on the end cap 12, and the electrode terminals 13 may be used to electrically connect with the electrode assembly 16 for outputting or inputting electric power. The electrode terminal 13 includes a positive electrode terminal 131 and a negative electrode terminal 132. In some embodiments, a pressure relief mechanism (not shown) may also be provided on the end cap 12 for venting the internal pressure of the battery cell 10 when the internal pressure or temperature reaches a threshold. In some embodiments, an insulator 14 may also be provided on the inside of the end cap 12, the insulator 14 may be used to isolate electrical connection components within the housing 11 from the end cap 12 to reduce the risk of shorting. Alternatively, the insulator 14 may be plastic, rubber, or the like.

The case 11 is a member for engaging the end cap 12 to form the internal environment of the battery cell 10. The internal environment defined by the housing 11 in cooperation with the end cap 12 may be used to house the electrode assembly 16, electrolyte, etc. In some embodiments, the housing 11 and the end cap 12 may be separate components, and an opening may be provided in the housing 11, with the end cap 12 covering the opening at the opening to create the internal environment of the battery cell 10. In some embodiments, the end cap 12 and the housing 11 may be integrated, specifically, the end cap 12 and the housing 11 may form a common connection surface before other components are put into the housing, and when the interior of the housing 11 needs to be sealed, the end cap 12 is covered with the housing 11. The housing 11 may be of various shapes and various sizes, such as a rectangular parallelepiped, a cylinder, a hexagonal prism, etc. Specifically, the shape of the case 11 may be determined according to the specific shape and size of the electrode assembly 16. The material of the housing 11 may be varied, and the housing 11 may be made of copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

The electrode assembly 16 is a component in which electrochemical reactions occur in the battery cell 10. One or more electrode assemblies 16 may be included within the housing 11. The electrode assembly 16 includes a positive electrode tab (not shown), a negative electrode tab (not shown), and a separator (not shown) that separates the positive and negative electrode tabs. The positive, separator, and negative electrode sheets may be wound, laminated, or otherwise processed to form the electrode assembly 16. In the electrode assembly 16, the portions of both the positive electrode tab and the negative electrode tab having active material constitute the main body portion 161 of the electrode assembly 16, and the portions of both the positive electrode tab and the negative electrode tab having no active material constitute the tabs 162, respectively, the tabs 162 being current transmission ends of the electrode assembly 16 for transmitting current. The tab 162 of the positive electrode tab is a positive electrode tab 1621, the tab 162 of the negative electrode tab is a negative electrode tab 1622, and the positive electrode tab 1621 and the negative electrode tab 1622 may be located at one end of the main body 161 together or at two ends of the main body 161 respectively.

The switching tab 15 is a current collecting member electrically connected between the tab 162 of the electrode assembly 16 and the corresponding electrode terminal 13. The switching tab 15 includes a positive switching tab 151 and a negative switching tab 152. The positive tab 1621 of the electrode assembly 16 may be electrically connected to the positive terminal 131 through the positive electrode tab 151, and the negative tab 1622 of the electrode assembly 16 may be electrically connected to the negative terminal 132 through the negative electrode tab 152 to form a current loop. In some embodiments, the tab 15 may be connected to the tab 162 of the electrode assembly 16 by welding, abutting, or the like. The tab 15 may be connected to the electrode terminal 13 by welding, abutment, or the like. The adaptor 15 may be made of various materials, such as copper, iron, aluminum, steel, and aluminum alloy. The shape of the adapter plate 15 may be varied, such as square, round, or irregular.

The electrolyte is a liquid that wets the electrode assembly 16. The battery cell 10 mainly relies on active ions moving between the positive electrode plate and the negative electrode plate, specifically, when the battery cell 10 is charged, the positive electrode plate generates active ions, and the active ions provided by the positive electrode plate can penetrate through the pores of the diaphragm, move to the negative electrode plate via the electrolyte, and are embedded into the negative active material of the negative electrode plate. In contrast, when the battery cell 10 discharges, the active ions embedded in the negative electrode active material of the negative electrode tab are extracted, and the active ions extracted from the negative electrode tab can penetrate the pores of the separator, move to the positive electrode tab via the electrolyte, and are embedded in the positive electrode active material of the positive electrode tab. Wherein the active ions may be lithium ions, sodium ions, and the like.

Referring to fig. 3, 4, 5 and 6, some embodiments of the present application provide a battery cell 10, which includes an end cap 12 and at least one adapter 15 disposed inside the end cap 12. At least one tab 15 has a first surface 153 facing the end cap 12, and a localized area of the first surface 153 is provided with a first insulating layer 154.

The end cap 12 is a member for enclosing the inner environment of the battery cell 10 together with the housing 11. And the formed battery cell 10 is isolated from the external environment in the internal environment and can be used for accommodating the switching piece 15 and other components.

The material of the end cap 12 may be varied, and may be made of copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

The end cover 12 may be made of a material with a certain hardness and strength, so that the end cover 12 is not easy to deform when being extruded and collided, so that the battery cell 10 can have higher structural strength, and the safety performance can be improved.

It should be noted that one or more tabs 15 may be provided in the battery cell 10. Each of the switching pieces 15 is provided on the same side of the end cap 12, specifically on the inner side of the end cap 12. The inside of the end cap 12 refers to the side of the end cap 12 facing the internal environment of the battery cell 10. As shown in fig. 3, in some embodiments, the battery cell 10 is provided with a plurality of tabs 15, the plurality of tabs 15 including a positive tab 151 and a negative tab 152, the positive tab 151 being for electrical connection between the positive tab 1621 and the positive terminal 131 of the electrode assembly 16, and the negative tab 152 being for electrical connection between the negative tab 1622 and the negative terminal 132 of the electrode assembly 16.

In the battery cell 10, at least one of the tabs 15 has a first surface 153 facing the end cap 12, and a partial area of the first surface 153 is provided with a first insulating layer 154. The "first surface 153" mentioned throughout refers to a surface of the interposer 15 facing the end cap 12 and having the first insulating layer 154 disposed in a partial region, and a surface of the interposer 15 facing the end cap 12 but not having the first insulating layer 154 disposed is not defined as "first surface 153". Wherein the first surface 153 may be, but is not limited to, a planar, curved, or irregular surface. The first insulating layer 154 is made of an insulating material and has an insulating property. The first insulating layer 154 may be, but not limited to, coated or injection molded on a corresponding region of the first surface 153 of the interposer 15. The first insulating layer 154 can be used for insulating and isolating the covered region of the first insulating layer 154 to improve the insulation between the region of the switching piece 15 covered by the first insulating layer 154 and the end cover 12, and reliably prevent the metal wire from accidentally conducting the region of the switching piece 15 covered by the first insulating layer 154 and the end cover 12, so that the risk of corrosion and liquid leakage of the end cover 12 due to electrochemical reaction can be reduced.

When the end cap 12 has positive polarity, the tab 15 provided with the first insulating layer 154 is the negative electrode tab 152, so that insulation between the negative electrode tab 152 and the end cap 12 is ensured and improved through the first insulating layer 154. Of course, in the present embodiment, the tab 15 provided with the first insulating layer 154 is not limited to the negative electrode tab 152 or the positive electrode tab 151.

In summary, in the battery cell 10 provided by the embodiment of the application, the first insulating layer 154 is disposed on the local area of the first surface 153 of the at least one adapter piece 15 facing the end cover 12, so that the first insulating layer 154 insulates and protects the area of the adapter piece 15 covered by the first insulating layer 154, thereby improving the insulation between the area of the adapter piece 15 covered by the first insulating layer 154 and the end cover 12, and reliably blocking the metal wire through the first insulating layer 154, so as to prevent the metal wire from accidentally conducting the area of the adapter piece 15 covered by the first insulating layer 154 and the end cover 12, and thus reducing the risk of corrosion and leakage phenomena of the end cover 12 due to electrochemical reaction.

Referring to fig. 3, 5 and 6, in some embodiments of the present application, the end cap 12 is provided with a mounting hole 121, and the battery cell 10 further includes an electrode terminal 13 correspondingly mounted to the mounting hole 121. The first surface 153 has a first connection region 1531 corresponding to the electrode terminal 13 and a first free region 1532 located outside the first connection region 1531, and at least a partial region of the first free region 1532 is provided with a first insulating layer 154.

The electrode terminal 13 is a member for outputting or inputting electric power. The electrode terminal 13 is fixedly connected to the end cap 12 by, but not limited to, integral injection molding, bonding, or the like. The end cap 12 is provided with a through mounting hole 121, and the electrode terminal 13 is provided corresponding to the mounting hole 121 and is mounted on the mounting hole 121. Wherein the mounting holes 121 may be, but are not limited to, circular holes, rectangular holes, or other shaped holes.

It should be noted that, each of the adaptor tabs 15 may be electrically connected to the corresponding electrode terminal 13 through the corresponding mounting hole 121, and the electrical connection may be, but not limited to, soldering, abutting, etc.

In each tab 15, at least one tab 15 has a first surface 153 facing the end cap 12 (i.e., facing the electrode terminal 13), the first surface 153 may be divided into a first connection region 1531 and a first free region 1532, the first connection region 1531 is a region where the first surface 153 is directly connected to the electrode terminal 13, the first free region 1532 is a region of the first surface 153 except the first connection region 1531, and a part or all of the first free region 1532 is provided with the first insulating layer 154.

Based on this, by adopting the above-described scheme, the at least one tab 15 can establish a stable and reliable electrical connection relationship with the electrode terminal 13 through the first connection region 1531 of the first surface 153, to reliably and effectively exert the current collecting effect. On this basis, the adaptor 15 may further be provided with the first insulating layer 154 on a part or all of the first free region 1532 of the first surface 153, so that on the basis of ensuring the current collecting effect, the insulation between the adaptor 15 and the end cap 12 is effectively improved through the first insulating layer 154, thereby effectively reducing the risk of accidental conduction of the metal wire between the adaptor 15 and the end cap 12, and effectively reducing the risk of corrosion and leakage of the end cap 12 due to electrochemical reaction.

Referring to fig. 6, 7 and 8, in some embodiments of the present application, the switching piece 15 has a protrusion 155 protruding toward the electrode terminal 13, and the protrusion 155 penetrates through the mounting hole 121 and is connected to the electrode terminal 13.

The tab 15 has a convex portion 155, and the convex portion 155 is provided to protrude toward the electrode terminal 13. The shape of the convex portion 155 may be varied, and may be, for example, a cylindrical shape or a square cylindrical shape. The boss 155 may be formed by, but not limited to, stamping. The tab 15 may be inserted into the corresponding mounting hole 121 through the protrusion 155 and electrically connected to the corresponding electrode terminal 13. The electrical connection between the protrusion 155 and the electrode terminal 13 may be, but not limited to, soldering, abutment, or the like. Correspondingly, in the adaptor 15 having the first surface 153, the first connection region 1531 of the first surface 153 is disposed on the protrusion 155.

Through the adoption of the scheme, the convex part 155 protruding towards one side of the electrode terminal 13 is arranged on the transfer sheet 15 in a penetrating manner, corresponding to the mounting hole 121, and is in fit and electric connection with the end face of the corresponding electrode terminal 13, so that electric connection between the transfer sheet 15 and the electrode terminal 13 is conveniently and rapidly constructed, and stability and reliability of electric connection between the transfer sheet 15 and the electrode terminal 13 are guaranteed. In addition, based on the arrangement, a certain gap is formed between other areas of the switching piece 15, which are not connected with the electrode terminals 13, and the end cover 12 so as to be insulated from each other, thereby ensuring and improving the insulativity between the switching piece 15 and the end cover 12, and reducing the risk of the end cover 12 from corroding and leaking due to electrochemical reaction.

Of course, in other possible embodiments, the tab 15 may not be provided with the protrusion 155, but may be electrically connected to the corresponding electrode terminal 13 in other configurations.

Referring to fig. 6, 7 and 8, in some embodiments of the present application, the first connection region 1531 is located on the end surface of the protrusion 155 near the electrode terminal 13, the first free region 1532 has an insulation region 15321 disposed around the first connection region 1531, the insulation region 15321 is located on the protrusion 155, the outer edge of the insulation region 15321 is located outside the edge of the protrusion 155, and the insulation region 15321 is provided with a first insulation layer 154.

In the tab 15 having the first surface 153, the first connection region 1531 of the first surface 153 is disposed on the end surface of the protrusion 155 near the electrode terminal 13, and therefore, the tab 15 can be electrically connected to the end surface of the corresponding electrode terminal 13 by bonding the end surface of the protrusion 155 near the electrode terminal 13.

And the area of the first surface 153 other than the first connection region 1531 is a first free region 1532. The first free region 1532 is divided into an insulating region 15321 on the circumferential side of the first connection region 1531. The insulating region 15321 is disposed around the first connection region 1531, with the insulating region 15321 being located largely on the boss 155. The inner edge of the insulating region 15321 is located outside the edge of the first connection region 1531 or is disposed to overlap the edge of the first connection region 1531. The outer edge of the insulating region 15321 is located outside the edge of the ledge 155. Based on this, the insulating region 15321 substantially includes the region of the protrusion 155 other than the first connection region 1531. The insulating region 15321 is provided with the first insulating layer 154, i.e., the first insulating layer 154 substantially covers the region of the protrusion 155 except the first connection region 1531.

By adopting the above-described scheme, at least one of the switching tabs 15 can be electrically connected to the end surface of the corresponding electrode terminal 13 in a bonded manner through the first connection region 1531 located on the end surface of the protrusion 155 near the electrode terminal 13, thereby conveniently, rapidly, stably and reliably constructing an electrical connection between the switching tab 15 and the electrode terminal 13. On the basis, the first insulating layer 154 is arranged on the insulating region 15321 basically comprising the region except the first connecting region 1531 of the protruding part 155, so that the insulating region 15321 is reliably insulated and isolated and protected by the first insulating layer 154, the insulation between the insulating region 15321 of the switching sheet 15, particularly the protruding part 155, and the end cover 12 can be improved, the risk that the metal wire accidentally conducts the insulating region 15321 of the switching sheet 15, particularly the protruding part 155, and the end cover 12 can be effectively reduced, and the risk that the end cover 12 corrodes and leaks due to electrochemical reaction can be effectively reduced.

Referring to fig. 3, 5 and 6, in some embodiments of the present application, the battery cell 10 further includes an insulating member 14, the insulating member 14 is mounted on a side of the end cover 12 near the rotation tab 15, and a through hole 141 is disposed at a position of the insulating member 14 corresponding to the mounting hole 121.

The insulating member 14 is mounted on the inner side of the end cap 12, that is, the insulating member 14 is mounted on the side of the end cap 12 facing the internal environment of the battery cell 10, that is, the insulating member 14 is mounted on the side of the end cap 12 near the switching piece 15. The insulator 14 may be attached to the end cap 12 by, but not limited to, integral injection molding, adhesive bonding, etc.

The insulator 14 is made of an insulating material, which may be plastic, rubber, or the like, for example. The insulating member 14 has insulating properties, and the insulating member 14 can be used for isolating the end cover 12 from the electrode assembly 16, the adapter piece 15 and other electrical connection components, so as to ensure electrical insulation between the end cover 12 and the electrode assembly 16, the adapter piece 15 and other electrical connection components, reliably reduce the risk of short circuit, and reliably reduce the risk of corrosion and liquid leakage of the end cover 12 due to electrochemical reaction. In some embodiments, the insulator 14 may also serve to lightly press, support, and bind the end faces of the electrode assembly 16 to stabilize the position of the electrode assembly 16 in the cell 10 while reducing the risk of the electrode assembly 16 from shifting in a direction toward or away from the end cap 12 in the interior environment of the cell 10.

The insulating member 14 is provided with a penetrating hole 141, and the penetrating hole 141 is disposed corresponding to the mounting hole 121, so that the adapter piece 15 can construct an electrical connection relationship with the corresponding electrode terminal 13 through the corresponding penetrating hole 141 and the mounting hole 121. Wherein the through hole 141 may be, but is not limited to, a circular hole, a rectangular hole, or other shaped hole.

Through adopting above-mentioned scheme, accessible installs the insulating part 14 in the end cover 12 be close to changeover piece 15 one side, on the basis of the changeover piece 15 of being convenient for see through corresponding through hole 141 and mounting hole 121 and corresponding electrode terminal 13 electricity connection, guarantee the electrical insulation between end cover 12 and the electric connecting parts such as electrode assembly 16, changeover piece 15 on a large scale, and reliably reduce the risk of short circuit. In addition, the insulating member 14 can be combined with the first insulating layer 154 on the switching piece 15 to jointly block the wire from conducting the end cover 12 and the switching piece 15, so that the risk of accidental wire conduction between the end cover 12 and the switching piece 15 can be reduced to a large extent. Thus, the risk of the end cap 12 from corroding and leaking due to electrochemical reaction can be effectively reduced.

Referring to fig. 6, in some embodiments of the present application, the insulating member 14 includes an insulating ring portion 142 disposed annularly, and the insulating ring portion 142 is connected to the hole edge of the through hole 141 and is disposed through the mounting hole 121.

The insulator 14 has an insulating ring portion 142. The insulating ring portion 142 is provided in a ring shape, and the insulating ring portion 142 may be a closed ring shape or an open ring shape. The insulating ring portion 142 is connected to the hole edge of the through hole 141 and extends toward the mounting hole 121, and the insulating ring portion 142 is installed in the mounting hole 121 in a penetrating manner. The inner diameter of the insulating ring 142 may be set in a direction approaching the mounting hole 121, or may be set in a tapered manner, or may be set in a divergent manner, or may be set in an irregular manner. Similarly, the outer diameter of the insulating ring portion 142 may be set in a direction approaching the mounting hole 121, may be set in a tapered manner, may be set in a divergent manner, or may be set in an irregular manner.

By adopting the above scheme, the insulating member 14 not only can insulate and protect the inner side of the end cover 12, but also can form certain insulation and protection for the hole wall of the mounting hole 121 by connecting to the hole edge of the penetrating hole 141 and penetrating the insulating ring part 142 of the mounting hole 121. Based on this, the insulating member 14 can reliably ensure the electrical insulation between the hole wall of the mounting hole 121 and the electrical connection member in the mounting hole 121 (i.e., the electrical connection member between the electrode terminal 13 and the adapter piece 15) through the insulating ring portion 142, so that the risk of short circuit can be reliably reduced, accidental conduction of the metal wire through the hole wall of the mounting hole 121 and the electrical connection member in the mounting hole 121 can be reliably prevented, and the risk of corrosion and leakage of the end cap 12 due to electrochemical reaction can be reliably reduced.

Referring to fig. 6, 9 and 10, in some embodiments of the present application, an inner loop line of the projection of the insulating ring portion 142 on the first surface 153 along the axial direction of the through hole 141 is a first loop line. The first free region 1532 has an insulating region 15321 disposed around the first connection region 1531, an outer edge of the insulating region 15321 being located outside the first loop line, the insulating region 15321 being provided with a first insulating layer 154.

The projection of the insulating ring portion 142 on the first surface 153 along the axial direction of the through hole 141 is annular, and an inner ring line (i.e., an inner ring boundary line) of the projection of the insulating ring portion 142 on the first surface 153 is the first ring line.

In the interposer 15 having the first surface 153, the first connection region 1531 of the first surface 153 is disposed corresponding to the mounting hole 121 and is electrically connected to the corresponding electrode terminal 13. In this regard, electrical insulation between the wall of the mounting hole 121 and the electrical connection member in the mounting hole 121 (i.e., the electrical connection member between the first connection region 1531 and the electrode terminal 13) may be secured by the insulating ring part 142.

And the area of the first surface 153 other than the first connection region 1531 is a first free region 1532. The first free region 1532 is divided into an insulating region 15321 on the circumferential side of the first connection region 1531. The insulating region 15321 is disposed around the first connection region 1531, and an inner edge of the insulating region 15321 is located outside an edge of the first connection region 1531 or is disposed to overlap with the edge of the first connection region 1531. The outer edge of the insulating region 15321 is located outside of the first loop line. Based on this, it can be ensured that the installation range of the insulating region 15321 partially coincides with the projection range of the insulating ring part 142. Thus, when the first insulating layer 154 is disposed on the insulating region 15321, the insulating protection range of the first insulating layer 154 on the insulating region 15321 can overlap and complement the insulating protection range of the insulating ring portion 142.

By adopting the above-mentioned scheme, on the basis that the insulating ring portion 142 ensures electrical insulation between the hole wall of the mounting hole 121 and the electrical connection component in the mounting hole 121, the at least one adaptor 15 may further partially overlap the setting range of the insulating region 15321 and the projection range of the insulating ring portion 142 on the first surface 153 by dividing the insulating region 15321 on the peripheral side of the first connection region 1531 and positioning the outer edge of the insulating region 15321 outside the first ring line. Accordingly, the insulation protection range of the first insulation layer 154 disposed on the insulation region 15321 can be ensured, and the insulation protection range of the insulation ring part 142 can be overlapped and complemented with each other. Therefore, the comprehensive insulation and isolation protection effect of the first insulation layer 154 on the insulation region 15321 and the insulation piece 14 can be guaranteed and enhanced, the metal wire can be effectively prevented from conducting the end cover 12 and the adapter piece 15, the risk that the metal wire accidentally conducts the end cover 12 and the adapter piece 15 can be greatly reduced, and the risk that the end cover 12 corrodes and leaks due to electrochemical reaction can be effectively reduced.

Referring to fig. 6, 9, and 10, in some embodiments of the application, a distance d1 between an outer edge of the insulating region 15321 and the first loop line is greater than or equal to 5mm.

The outer edge of the insulating region 15321 may be disposed at equal intervals or may be disposed at unequal intervals with respect to the first loop line. The distance d1 between the outer edge of the insulating region 15321 and the first loop line is greater than or equal to 5mm, for example, the distance d1 between the outer edge of the insulating region 15321 and the first loop line may be 5mm, 6mm, 7mm, or the like.

By adopting the above scheme, the outer edge of the insulation region 15321 is located at the outer side of the first loop line, and the distance d1 between the outer edge of the insulation region 15321 and the first loop line is greater than or equal to 5mm, so that the setting range of the insulation region 15321 and the projection range of the insulation ring part 142 on the first surface 153 form a certain degree of overlapping, thereby optimizing the comprehensive insulation and isolation protection effect of the first insulation layer 154 on the insulation region 15321 and the insulation part 14, effectively preventing the metal wire from conducting the end cover 12 and the transfer piece 15, effectively reducing the risk of the metal wire from accidentally conducting the end cover 12 and the transfer piece 15, and effectively reducing the risk of the end cover 12 from corroding and leaking due to electrochemical reaction.

Referring to fig. 9 and 10, in some embodiments of the present application, a distance d2 between the insulating ring portion 142 and the end surface of the electrode terminal 13 is 0mm to 1mm.

The insulating ring portion 142 is connected to the hole edge of the through hole 141, extends toward the mounting hole 121, and is installed in the mounting hole 121. The distance d2 between the end of the insulating ring portion 142 near the electrode terminal 13 and the end face of the electrode terminal 13 is 0mm to 1mm, for example, 0mm, 0.5mm, 1mm, or the like.

Through adopting above-mentioned scheme, the interval d2 between the terminal surface of accessible messenger's insulating ring portion 142 and electrode terminal 13 is 0mm ~1mm to ensure that insulating ring portion 142 has sufficient height in the direction that is close to electrode terminal 13, thereby can enlarge insulating isolation protection scope of insulating ring portion 142, can strengthen insulating isolation protection effect of insulating ring portion 142 to the pore wall of mounting hole 121, can strengthen insulating ring portion 142 and to the barrier effect of wire, thereby can effectively reduce the risk that the unexpected end cover 12 of wire and changeover piece 15 that switches on, can effectively reduce the risk that end cover 12 appears corroding the weeping phenomenon because of producing electrochemical reaction.

Referring to fig. 6, 9 and 10, in some embodiments of the present application, the battery cell 10 further includes a sealing ring 17, and the sealing ring 17 is mounted at the hole edge of the mounting hole 121 and is hermetically connected between the end cap 12 and the electrode terminal 13.

The seal ring 17 is mounted on the outer hole edge of the mounting hole 121, and the seal ring 17 may be located entirely on the outer hole edge of the mounting hole 121, or may be located partially on the outer hole edge of the mounting hole 121 and partially extend into the mounting hole 121. Wherein, the outside of the mounting hole 121 refers to a side of the mounting hole 121 facing away from the internal environment of the battery cell 10, i.e., a side of the mounting hole 121 facing away from the switching piece 15.

The electrode terminal 13 is mounted on the mounting hole 121, and the sealing ring 17 is hermetically connected between the hole edge of the mounting hole 121 and the electrode terminal 13, i.e., the sealing ring 17 is hermetically connected between the end cap 12 and the electrode terminal 13. The seal ring 17 may have a full sealing function or may have only a partial sealing function.

The material of the seal ring 17 may be varied, and may be, for example, plastic, rubber, or the like.

Through adopting above-mentioned scheme, battery cell 10 accessible is installed in the sealing washer 17 of the hole edge of mounting hole 121, reliably seals between end cover 12 and electrode terminal 13, especially reliably seals between the hole edge of mounting hole 121 and electrode terminal 13 to can ensure and improve battery cell 10's sealing performance and sealing reliability, can reduce battery cell 10 weeping risk.

Referring to fig. 6, 9 and 10, in some embodiments of the present application, the seal ring 17 includes a seal ring portion 171 disposed annularly, and the seal ring portion 171 is disposed through the mounting hole 121. In the radial direction of the mounting hole 121, the projection of the insulating ring portion 142 overlaps with the projection of the seal ring portion 171.

The inner ring of the seal ring 17 is provided with a seal ring portion 171. The seal ring portion 171 is provided in an annular shape, and the seal ring portion 171 may be closed annular or open annular. The seal ring portion 171 is inserted into the mounting hole 121, that is, the seal ring portion 171 extends into the mounting hole 121.

And the insulating ring portion 142 of the insulating member 14 is also penetrated into the mounting hole 121. Based on this, the projection of the insulating ring portion 142 and the projection portion of the seal ring portion 171 may be overlapped in the radial direction of the mounting hole 121 so that the insulating ring portion 142 and the seal ring portion 171 can overlap each other while jointly blocking the passage of the wire through the gap path between the insulating ring portion 142 and the seal ring portion 171. Here, at the overlapping position of the projection of the insulating ring portion 142 and the projection of the sealing ring portion 171, the insulating ring portion 142 may be located on the side of the sealing ring portion 171 away from the wall of the mounting hole 121, or may be located on the side of the sealing ring portion 171 close to the wall of the mounting hole 121.

By adopting the above-described arrangement, the projection of the insulating ring portion 142 of the insulator 14 and the projection of the seal ring portion 171 of the seal ring 17 can be made to overlap in the radial direction of the mounting hole 121 by overlapping the insulating ring portion 142 and the seal ring portion 171 in the radial direction of the mounting hole 121. Based on this, the bending degree and length of the gap path between the insulating ring portion 142 and the sealing ring portion 171 can be increased, the blocking effect of the insulating ring portion 142 and the sealing ring portion 171 on the metal wire can be enhanced, the gap path between the insulating ring portion 142 and the sealing ring portion 171, through which the metal wire passes through the insulating ring portion 142 and the sealing ring portion 171, can be ensured, so that the risk that the metal wire accidentally conducts the end cover 12 and the adapter piece 15 can be effectively reduced, and the risk that the end cover 12 corrodes and leaks due to electrochemical reaction can be effectively reduced.

Referring to fig. 6, 9 and 10, in some embodiments of the present application, the insulating ring portion 142 includes a first ring segment 1421 connected to the hole edge of the through hole 141, and the first ring segment 1421 is in interference fit with the sealing ring portion 171.

The first ring section 1421 is connected to the hole edge of the through hole 141, and extends toward the mounting hole 121. The width of the first ring segment 1421 may be constant, may be tapered, may be gradually enlarged, or may be irregularly changed in the direction approaching the seal ring portion 171. Wherein the width of the first ring segment 1421 refers to the dimension of the distance between the inner and outer rings. The first ring segment 1421 is an interference fit with the seal ring portion 171.

Through adopting above-mentioned scheme, insulating ring portion 142 accessible first ring segment 1421 and sealing ring portion 171 interference fit, and the clearance route between reliable shutoff sealing ring portion 171 and insulating ring portion 142 especially first ring segment 1421 to can effectively, reliably hinder the clearance route that the wire passes through between sealing ring portion 171 and insulating ring portion 142 especially first ring segment 1421, can effectively reduce the risk that the unexpected end cover 12 of wire switches on and changeover piece 15, can effectively reduce the risk that end cover 12 appears corroding the weeping phenomenon because of producing electrochemical reaction.

Referring to fig. 9 and 10, in some embodiments of the present application, the insulating ring portion 142 further includes a second ring segment 1422, the second ring segment 1422 is connected to an end of the first ring segment 1421 near the seal ring portion 171, the width of the second ring segment 1422 is smaller than the width of the first ring segment 1421, and the second ring segment 1422 is in clearance fit with the seal ring portion 171.

The second ring segment 1422 is connected to an end of the first ring segment 1421 adjacent to the seal ring portion 171, that is, the second ring segment 1422 is connected to an end of the first ring segment 1421 adjacent to the electrode terminal 13. The width of the second ring segment 1422 is less than the width of the first ring segment 1421. Based on this, the insulating ring portion 142 can be facilitated to be interference fit with the seal ring portion 171 through the first ring segment 1421 and to be clearance fit with the seal ring portion 171 through the second ring segment 1422. The width of the second ring segment 1422 may be constant or may be tapered. Wherein the width of the second ring segment 1422 refers to the dimension of the distance between the inner ring and the outer ring of the second ring segment 1422.

By adopting the above scheme, the insulating ring part 142 can be in clearance fit with the sealing ring part 171 through the second ring segment 1422 with smaller width, so that the fit resistance between the insulating ring part 142 and the sealing ring part 171 is reduced, and the fit convenience and the fit reliability between the insulating ring part 142 and the sealing ring part 171 can be improved.

Through adopting above-mentioned scheme, insulating ring portion 142 accessible width is great first ring segment 1421 and sealing ring portion 171 interference fit, and the clearance route between sealing ring portion 171 and the insulating ring portion 142 especially first ring segment 1421 reliably blocks off, and on this basis, form the ladder structure through second ring segment 1422 and first ring segment 1421, and reliably increase the tortuosity degree of clearance route between insulating ring portion 142 and sealing ring portion 171, thereby can effectively, reliably hinder the wire to pass through the clearance route between sealing ring portion 171 and insulating ring portion 142, can effectively reduce the risk that the unexpected switch on end cover 12 and the changeover piece 15 of wire, can effectively reduce the risk that the end cover 12 appears corroding the weeping phenomenon because of producing electrochemical reaction.

Referring to fig. 3, 6 and 11, in some embodiments of the present application, at least one of the adaptor tabs 15 has a second surface 156 facing away from the end cap 12, and a local area of the second surface 156 is provided with a second insulating layer 157.

It should be noted that, in the battery cell 10, at least one of the tabs 15 has a second surface 156 facing away from the end cap 12, and a local area of the second surface 156 is provided with a second insulating layer 157. Herein, the "second surface 156" is referred to as a surface of the interposer 15 facing away from the end cap 12 and the second insulating layer 157 is disposed in a partial region, and a surface of the interposer 15 facing away from the end cap 12 but not disposed with the second insulating layer 157 is not defined as "second surface 156". The at least one adapter piece 15 may be provided with both the first surface 153 and the second surface 156, or the at least one adapter piece 15 may be provided with only the first surface 153, or the at least one adapter piece 15 may be provided with only the second surface 156.

Wherein the second surface 156 may be, but is not limited to being, a planar, curved, or irregular surface. The second insulating layer 157 is made of an insulating material, and has an insulating property, and the material of the second insulating layer 157 may be the same as or different from that of the first insulating layer 154. The second insulating layer 157 may be formed on the corresponding area of the second surface 156 of the interposer 15 by, but not limited to, coating or injection molding. The second insulating layer 157 can be used for insulating and protecting the covered region thereof, so as to improve the insulation between the region of the switching piece 15 covered by the second insulating layer 157 and the end cover 12, and reliably prevent the metal wire from accidentally conducting the region of the switching piece 15 covered by the second insulating layer 157 and the end cover 12, thereby reducing the risk of corrosion and liquid leakage of the end cover 12 due to electrochemical reaction.

By adopting the above scheme, the second insulating layer 157 is arranged on the local area of the second surface 156 of the at least one adapter piece 15, which is away from the end cover 12, so that the area of the adapter piece 15 covered by the second insulating layer 157 is insulated and isolated by the second insulating layer 157, thereby improving the insulativity between the area of the adapter piece 15 covered by the second insulating layer 157 and the end cover 12 and the shell 11, reliably blocking the metal wires through the second insulating layer 157, and preventing the metal wires from accidentally conducting the area of the adapter piece 15 covered by the second insulating layer 157 and the end cover 12 or the shell 11, thereby reducing the risk of corrosion and leakage phenomena of the end cover 12 and the shell 11 due to electrochemical reaction.

Referring to fig. 3, 6 and 11, in some embodiments of the present application, the battery cell 10 further includes an electrode assembly 16, the electrode assembly 16 is disposed on a side of the switching piece 15 facing away from the end cap 12, and the electrode assembly 16 has a tab 162 connected to the switching piece 15. The second surface 156 has a second connection region 1561 corresponding to the tab 162, and a second free region 1562 located outside the second connection region 1561, and at least a partial region of the second free region 1562 is provided with a second insulating layer 157.

The electrode assembly 16 is a member in which electrochemical reactions occur in the battery cell 10. The electrode assembly 16 may be formed by processing a positive electrode tab, a separator, and a negative electrode tab via winding, lamination, or other means. In the electrode assembly 16, the portions of both the positive electrode tab and the negative electrode tab having active material constitute the main body portion 161 of the electrode assembly 16, and the portions of both the positive electrode tab and the negative electrode tab having no active material constitute the tabs 162, respectively, the tabs 162 being current transmission ends of the electrode assembly 16 for transmitting current. The tab 162 of the positive electrode tab is a positive electrode tab 1621, the tab 162 of the negative electrode tab is a negative electrode tab 1622, and the positive electrode tab 1621 and the negative electrode tab 1622 may be located at one end of the main body 161 together or at two ends of the main body 161 respectively.

The electrode assembly 16 is provided on a side of the tab 15 facing away from the end cap 12, in other words, the tab 15 is provided between the tab 162 of the electrode assembly 16 and the end cap 12. The tab 162 of the electrode assembly 16 is electrically connected to the corresponding tab 15 by, but not limited to, welding, abutment, etc.

It should be further noted that, in each tab 15, at least one tab 15 has a second surface 156 facing away from the end cap 12 (i.e., facing the electrode assembly 16), the second surface 156 may be divided into a second connection region 1561 and a second free region 1562, the second connection region 1561 is a region where the second surface 156 is directly connected to the tab 162 of the electrode assembly 16, the second free region 1562 is a region of the second surface 156 except for the second connection region 1561, and a part or all of the region of the second free region 1562 is provided with the second insulating layer 157.

Based on this, by adopting the above-described scheme, at least one tab 15 can be electrically connected with the tab 162 of the electrode assembly 16 in a stable and reliable manner through the second connection region 1561 of the second surface 156, so as to reliably and effectively exert the current collecting effect. On this basis, the adaptor 15 may further be provided with a second insulating layer 157 on a partial or whole area of the second free region 1562 of the second surface 156, so that on the basis of ensuring the current collecting effect, the insulation between the adaptor 15 and the end cover 12 and between the adaptor 15 and the housing 11 is effectively improved through the second insulating layer 157, thereby effectively reducing the risk of accidental conduction of the metal wire between the adaptor 15 and the end cover 12 or the housing 11, and effectively reducing the risk of corrosion and leakage phenomena of the end cover 12 and the housing 11 due to electrochemical reaction.

Referring to fig. 8, in some embodiments of the present application, the thickness of the first insulating layer 154 is 0.01mm to 0.2mm.

The thickness of the first insulating layer 154 refers to the dimension of the first insulating layer 154 in the thickness direction thereof, and the thickness direction of the first insulating layer 154 corresponds to the thickness direction of the switching piece 15. The thickness of the first insulating layer 154 is 0.01mm to 0.2mm, for example, 0.05mm, 0.1mm, 0.15mm, 0.2mm, or the like.

Through adopting above-mentioned scheme, the thickness of accessible messenger's first insulating layer 154 is 0.01mm ~0.2mm to ensure that first insulating layer 154 has certain insulating isolation protection effect, and still can reduce the increase in the influence of first insulating layer 154 to the occupation space of changeover piece 15, can reduce the cost of changeover piece 15.

Referring to fig. 11, in some embodiments of the present application, the thickness of the second insulating layer 157 is 0.01mm to 0.2mm.

The thickness of the second insulating layer 157 refers to the dimension of the second insulating layer 157 in the thickness direction thereof, and the thickness direction of the second insulating layer 157 corresponds to the thickness direction of the switching piece 15. The thickness of the second insulating layer 157 is 0.01mm to 0.2mm, for example, 0.05mm, 0.1mm, 0.15mm, 0.2mm, or the like.

Through adopting above-mentioned scheme, the thickness of accessible second insulating layer 157 is 0.01mm ~0.2mm to ensure that second insulating layer 157 has certain insulating isolation protection effect, and also can reduce the increase in the influence of second insulating layer 157 to the occupation space of changeover piece 15, can reduce the cost of changeover piece 15.

Referring to fig. 8, in some embodiments of the present application, the first insulating layer 154 is a polymer insulating layer or a composite layer containing a polymer insulating material.

It should be noted that the first insulating layer 154 may be a polymer insulating layer made of a polymer insulating material, or may be a composite layer made of a polymer insulating material and other materials. The polymer insulating material can be, but is not limited to, epoxy resin.

By adopting the above-described scheme, the first insulating layer 154 can be made to be a polymer insulating layer or a composite layer containing a polymer insulating material, so that the first insulating layer 154 can have the characteristics of the polymer insulating material and has excellent insulating properties.

Referring to fig. 11, in some embodiments of the present application, the second insulating layer 157 is a polymer insulating layer or a composite layer containing a polymer insulating material.

It should be noted that, the second insulating layer 157 may be a polymer insulating layer made of a polymer insulating material, or may be a composite layer made of a polymer insulating material and other materials. The polymer insulating material can be, but is not limited to, epoxy resin.

By adopting the above-described configuration, the second insulating layer 157 can be made to be a polymer insulating layer or a composite layer containing a polymer insulating material, so that the second insulating layer 157 can have the characteristics of the polymer insulating material and can have excellent insulating properties.

Referring to fig. 2 and 3, some embodiments of the present application provide a battery 1, where the battery 1 includes a battery cell 10 according to an embodiment of the present application.

By adopting the scheme, the battery 1 can reduce the risk of short circuit and the risks of damage, corrosion and liquid leakage of the battery 1 by applying the battery cell 10 provided by the embodiment of the application, thereby guaranteeing and prolonging the service life of the battery 1.

Referring to fig. 1, 2 and 3, some embodiments of the present application provide an electric device, which includes a battery 1 provided in an embodiment of the present application, or a battery cell 10 provided in an embodiment of the present application.

By adopting the scheme, the power utilization device can ensure and improve the performance, the use safety and the service life of the power utilization device by applying the battery 1 or the battery cell 10 provided by the embodiment of the application.

The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is intended to cover all modifications, equivalents, or alternatives falling within the spirit and principles of the application.

Claims

1. The battery cell is characterized by comprising an end cover and at least one switching piece arranged on the inner side of the end cover, wherein at least one switching piece is provided with a first surface facing the end cover, and a first insulating layer is arranged on a local area of the first surface.

2. The battery cell of claim 1, wherein the end cap is provided with a mounting hole, the battery cell further comprising an electrode terminal correspondingly mounted to the mounting hole;

the first surface is provided with a first connecting region correspondingly connected with the electrode terminal and a first free region positioned outside the first connecting region, and at least a partial region of the first free region is provided with the first insulating layer.

3. The battery cell according to claim 2, wherein the adapter piece has a convex portion protruding toward the electrode terminal, the convex portion penetrating the mounting hole and connecting the electrode terminal.

4. The battery cell as defined in claim 3, wherein the first connection region is located on an end surface of the protrusion near the electrode terminal, the first free region has an insulation region disposed around the first connection region, the insulation region is located at the protrusion, an outer edge of the insulation region is located outside an edge of the protrusion, and the insulation region is provided with the first insulation layer.

5. The battery cell as recited in claim 2, further comprising an insulator mounted to a side of the end cap adjacent the tab, the insulator having a through hole corresponding to the mounting hole.

6. The battery cell as recited in claim 5, wherein the insulator includes an insulating ring portion disposed in a ring shape, the insulating ring portion being connected to a hole edge of the through hole and being disposed through the mounting hole.

7. The battery cell as defined in claim 6, wherein an inner loop line of the projection of the insulating ring portion on the first surface in the axial direction of the through hole is a first loop line;

the first free region is provided with an insulating region arranged around the first connecting region, the outer edge of the insulating region is positioned on the outer side of the first loop line, and the insulating region is provided with the first insulating layer.

8. The battery cell of claim 7, wherein a spacing between an outer edge of the insulating region and the first loop line is greater than or equal to 5mm.

9. The battery cell according to claim 6, wherein a distance between the insulating ring portion and the end face of the electrode terminal is 0mm to 1mm.

10. The battery cell as recited in claim 6, further comprising a seal ring mounted to the rim of the mounting hole and sealingly connected between the end cap and the electrode terminal.

11. The battery cell as defined in claim 10, wherein the seal ring comprises a seal ring portion disposed in a ring shape, the seal ring portion penetrating the mounting hole;

in the radial direction of the mounting hole, the projection of the insulating ring part coincides with the projection part of the sealing ring part.

12. The battery cell of claim 11, wherein the insulating ring portion includes a first ring segment connected to a rim of the through hole, the first ring segment being in an interference fit with the sealing ring portion.

13. The battery cell of claim 12, wherein the insulating ring portion further comprises a second ring segment connected to an end of the first ring segment proximate the seal ring portion, the second ring segment having a width less than a width of the first ring segment, the second ring segment being in clearance fit with the seal ring portion.

14. The battery cell of any one of claims 1-13, wherein at least one of the tabs has a second surface facing away from the end cap, and a localized area of the second surface is provided with a second insulating layer.

15. The battery cell of claim 14, further comprising an electrode assembly disposed on a side of the tab facing away from the end cap, the electrode assembly having a tab connected to the tab;

The second surface is provided with a second connecting area correspondingly connected with the tab and a second free area positioned outside the second connecting area, and at least a partial area of the second free area is provided with the second insulating layer.

16. The battery cell of any one of claims 1-13, wherein the first insulating layer has a thickness of 0.01mm to 0.2mm.

17. The battery cell of any one of claims 1-13, wherein the first insulating layer is a polymeric insulating layer or a composite layer comprising a polymeric insulating material.

18. A battery comprising the battery cell of any one of claims 1-17.

19. An electrical device comprising a battery according to claim 18, or a cell according to any one of claims 1-17.