CN218867341U

CN218867341U - Battery monomer, battery and consumer

Info

Publication number: CN218867341U
Application number: CN202223012770.7U
Authority: CN
Inventors: 杨开焕; 周文林; 柯海波; 李全坤; 周健
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2022-11-10
Filing date: 2022-11-10
Publication date: 2023-04-14
Anticipated expiration: 2032-11-10

Abstract

The embodiment of the application provides a single battery, a battery and electric equipment, and belongs to the technical field of batteries. The battery cell comprises an electrode assembly, an electrode leading-out piece and a first insulating piece, wherein the electrode assembly comprises a main body and a tab extending out of the main body; the electrode lead-out piece is connected with the lug to lead out the electric energy of the electrode assembly, and the electrode lead-out piece is provided with a first surface facing the main body; the first insulator covers at least a portion of the first surface. The battery monomer that this application embodiment provided has higher security.

Description

Battery monomer, battery and consumer

Technical Field

The application relates to the technical field of batteries, in particular to a battery monomer, a battery and electric equipment.

Background

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

In addition to improving the performance of batteries, safety is also a considerable problem in the development of battery technology. Therefore, how to improve the safety of the battery is a technical problem that needs to be solved urgently in the battery technology.

SUMMERY OF THE UTILITY MODEL

The application aims to provide a battery cell, a battery and electric equipment. The battery monomer that this application embodiment provided has higher security.

The application is realized by the following technical scheme:

in a first aspect, the present application provides a battery cell comprising an electrode assembly, an electrode lead-out member, and a first insulating member, the electrode assembly comprising a main body and tabs extending from the main body; the electrode lead-out piece is connected with the lug to lead out the electric energy of the electrode assembly, and the electrode lead-out piece is provided with a first surface facing the main body; the first insulator covers at least a portion of the first surface.

According to the battery cell, the electrode leading-out piece is provided with the first surface facing the main body of the electrode assembly, at least one part of the first surface is covered by the first insulating piece, the insulating effect between the first surface and the main body of the electrode assembly is improved, the risk of lap short circuit between the fallen active material layer and the electrode leading-out piece is reduced, and the battery cell is high in safety.

According to some embodiments of the present application, the first insulating member is provided with a first opening opposite to the first surface, and the electrode lead includes a first connection region exposed from the first opening, the first connection region being connected with the tab.

In above-mentioned scheme, first opening sets up with first surface is relative, and exposes first joining region to supply the electrode to derive the piece and be connected with utmost point ear, reduce the risk that first insulating part influences electrode derivation piece and utmost point ear and is connected.

According to some embodiments of the application, the first insulator is injection molded to the electrode lead-out.

In the above scheme, the first insulating part is injection molded on the electrode leading-out part, so that the processing and the manufacturing are convenient, and the first insulating part is stably connected with the electrode leading-out part.

According to some embodiments of the present application, the electrode assembly is provided with at least two, the electrode lead-out member includes a body and at least two extensions, the extensions extending from a first edge of the body, the number of extensions being equal to the number of electrode assemblies, the extensions being for connection with the tabs.

In the above scheme, the number of the extension parts is at least two, so that a plurality of electrode assemblies are matched, and the connection of the electrode lugs and the electrode lead-out pieces is facilitated.

According to some embodiments of the application, the extension and the body are aligned in a first direction in which the first insulator is flush with or beyond an end of the extension away from the body.

In the above scheme, the first insulating member exceeds the end of the extension part far away from the body or is flush with the end of the extension part far away from the body, so that the first insulating member has a larger covering area on the first surface, and the insulating effect of the first insulating member on the first surface is further improved.

According to some embodiments of the application, the extension parts and the body are arranged along a first direction, one side of each two adjacent extension parts, which is close to each other, is provided with a second edge, the first edge and the second edge are connected through a transition arc, and the first insulating part covers the transition arc.

In the scheme, the second edge is connected with the first edge through the transition arc, so that the processing and the manufacturing are convenient; the first insulating part coats the transition arc to enhance the connection strength between the extension part and the body and reduce the risk of stress damage at the connection part of the extension part and the body.

According to some embodiments of the present application, between two adjacent extensions, the first insulating member exceeds the first edge by a distance L in the first direction, and the radius of the transition arc is R, so that L ≧ R.

In the scheme, the distance from the first insulating part to the first edge is greater than or equal to the radius of the transition arc, so that the connection strength between the extension part and the body is further enhanced, and the risk of stress damage of the connection part of the extension part and the body is reduced.

According to some embodiments of the present application, the first insulating member includes a bottom wall and a convex portion connected to each other, the bottom wall covering at least a part of the first surface, the electrode lead-out member is provided with a concave portion, and the convex portion and the concave portion are fitted to each other.

In the above scheme, the convex part and the concave part are mutually embedded, so that the first insulating part is not easy to be disconnected from the electrode lead-out part, and the first insulating part and the electrode lead-out part are firmly assembled.

According to some embodiments of the application, the electrode lead-out further has a second surface facing away from the body, the recess being a through hole extending through the first surface and the second surface.

In the scheme, the concave part is the through hole, so that the processing and the manufacturing are convenient, and the manufacturing cost is low.

According to some embodiments of the application, the through hole comprises a first hole section, and the cross-sectional area of the first hole section is gradually increased along the direction from the first surface to the second surface.

In the above solution, the sectional area of the first hole section is an area of the first hole section obtained by cutting a surface parallel to the first surface, the sectional area of the first hole section gradually increases along a direction from the first surface to the second surface, and after the protrusion and the through hole are mutually fitted, the connection strength of the first insulating member and the electrode lead-out member in the thickness direction of the electrode lead-out member is further enhanced, and the connection stability of the first insulating member and the electrode lead-out member is ensured.

According to some embodiments of the present application, the electrode lead-out member further has a second surface facing away from the main body and a side surface connecting the first surface and the second surface, the first insulating member includes a bottom wall covering at least a portion of the first surface and a side wall protruding from an edge of the bottom wall in a direction facing away from the electrode assembly, the side wall covering at least a portion of the side surface.

In the above scheme, the side wall covers at least a part of the side surface, and the connection area between the first connecting piece and the electrode leading-out piece is increased, so that the first insulating piece and the electrode leading-out piece have better connection stability, and the insulating effect of the first insulating piece on the electrode leading-out piece is improved.

According to some embodiments of the application, the first insulator further comprises a top wall covering a portion of the second surface, the top wall and the bottom wall being connected by a side wall.

In the above scheme, the top wall covers a part of the second surface, and the side wall connects the top wall and the bottom wall, so that the bottom wall is not easy to separate from the first surface.

According to some embodiments of the present application, the battery cell further includes an electrode terminal, and the electrode lead-out member is an interposer electrically connecting the electrode terminal and the tab.

In the above scheme, the electrode leading-out piece is an adapter sheet, so that the connection of the electrode terminal and the tab is conveniently realized, and the electric energy of the electrode component is conveniently led out.

According to some embodiments of the present application, the first insulating member is provided with a second opening, and the interposer includes a second connection region corresponding to the second opening, the second connection region being connected with the electrode terminal.

In the above aspect, the second opening is provided so as to enable connection of the second connection region to the electrode terminal.

According to some embodiments of the present application, the battery cell further comprises: and the second insulating piece is arranged on the first surface and covers the second connecting area.

In the above scheme, the second insulating part is arranged on the first surface and covers the second connection area, so that the insulating effect of the first surface is further improved, and the risk of short circuit in the single battery is reduced.

According to some embodiments of the present application, the second insulator is connected to the first insulator.

In the above scheme, the second insulating part is connected with the first insulating part, so that the risk of separation of the second insulating part from the adapter sheet is reduced. The second insulating member may be an adhesive tape, or the second insulating member may be an insulating adhesive.

According to some embodiments of the application, a second insulator fills the second opening.

In the above scheme, the second opening is filled with the second insulating part, the second insulating part is matched with the first insulating part, the area, exposed out of the second connecting area, of the first insulating part can be completely covered, and the risk that the fallen active material layer enters the second opening to cause short circuit is reduced.

According to some embodiments of the application, the electrode lead-out member includes a first connection region for connection with the tab, and the second insulating member and the first insulating member completely cover an area of the first surface other than the first connection region.

In the above scheme, the second insulating member and the first insulating member completely cover the area of the first surface except the first connection area, so that the first surface has a larger insulating area, and the insulating effect of the first surface is further improved.

According to some embodiments of the application, the electrode lead-out is an electrode terminal.

In the above scheme, the electrode leading-out piece is an electrode terminal, the structure is simple, the utilization rate of the internal space of the single battery is high, and the single battery has higher energy density.

According to some embodiments of the present application, the tab is of a bent structure, and the battery cell further includes a third insulating member disposed at an inner side of the bent tab.

In the above scheme, the third insulating part is arranged on the inner side of the bent tab, so that the insulating effect of the inner side of the tab is enhanced, and the risk of the internal short circuit of the single battery is further reduced.

According to some embodiments of the application, the third insulator extends to the body.

In the above aspect, the third insulating member extends to the main body, improving connection stability of the third insulating member with the electrode assembly.

In a second aspect, the present application further provides a battery including the battery cell provided in any of the above embodiments.

In a third aspect, the present application further provides an electric device, including the battery cell provided in any of the above embodiments, where the battery cell is used to provide electric energy.

In a fourth aspect, the present application also provides a method for manufacturing a battery cell, including:

providing an electrode leading-out piece, wherein a first surface of the electrode leading-out piece is covered with a first insulating piece and is exposed out of a first connecting area;

connecting a tab of an electrode assembly with a first connection region;

the tab is bent such that the first surface faces the main body of the electrode assembly.

According to the manufacturing method of the single battery, the first surface is covered with the first insulating part, and the first connecting area is exposed out of the first surface, so that the tab is conveniently connected with the first connecting area, the insulating effect of the first surface can be enhanced, the risk of lap short circuit of the fallen active material layer and the electrode leading-out part is reduced, and the single battery has high safety.

According to some embodiments of the present application, the electrode lead-out member is an interposer; providing an electrode lead-out member, wherein a first surface of the electrode lead-out member is covered with a first insulating member and exposes a first connection region, and the electrode lead-out member comprises: providing an electrode leading-out piece, wherein a first surface of the electrode leading-out piece is covered with a first insulating piece and exposes a first connecting area and a second connecting area; the method of manufacturing a battery cell further includes: connecting the electrode terminal to the second connection region; a second insulating member is provided on the first surface to cover the second connection region.

In the above scheme, the electrode leading-out piece is an adapter plate, the electric connection between the electrode lug and the electrode terminal is realized through the electrode leading-out piece, and the second insulating piece covers the area of the second connecting area on the first surface, so that the insulating effect of the first surface is further improved, and the risk of the internal short circuit of the battery monomer is reduced.

In the above scheme, the electrode leading-out part is the electrode terminal, the tab is connected with the electrode terminal, the number of parts in the single battery is reduced, the space utilization rate in the single battery is improved, and the single battery has higher energy density.

According to some embodiments of the present application, the method of manufacturing a battery cell further comprises: and covering a third insulating piece on the surface of the tab, so that after the tab is bent, the third insulating piece is arranged on the inner side of the bent tab.

In the scheme, the third insulating piece covers the surface of the bent inner side of the tab, so that the risk of internal short circuit of the battery cell is further reduced.

Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

FIG. 1 is a schematic illustration of a vehicle according to some embodiments of the present application;

fig. 2 is an exploded view of a battery provided in accordance with some embodiments of the present application;

fig. 3 is an exploded view of a battery cell provided in some embodiments of the present application;

fig. 4 is a schematic structural view of an electrode lead-out member and a first insulating member according to some embodiments of the present disclosure;

fig. 5 is a schematic view of an assembly of an electrode lead-out member and a first insulating member according to some embodiments of the present disclosure;

fig. 6 is a top view of an electrode lead-out member and a first insulator assembly according to some embodiments of the present disclosure;

FIG. 7 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 6;

FIG. 8 is a schematic view of an assembly of an electrode lead-out member and a first insulating member according to further embodiments of the present application;

fig. 9 is a schematic view of a tab and an interposer provided in accordance with some embodiments of the present application;

fig. 10 is a schematic view of a tab and electrode terminal connection provided by some embodiments of the present application;

fig. 11 is a schematic flow chart of a method of manufacturing a battery cell according to some embodiments of the present application;

fig. 12 is a schematic flow chart illustrating a method of manufacturing a battery cell according to further embodiments of the present application.

An icon: 100-a battery; 10-a box body; 11-a first sub-tank; 12-a second sub-tank; 20-a battery cell; 21-a housing; 211-a housing; 212-a cover; 22-an electrode assembly; 221-a body; 222-a tab; 23-electrode lead-out; 23 a-an interposer; 23 b-electrode terminals; 231-a first surface; 232-first connection region; 233-body; 2331-a first edge; 234-an extension; 2341 — second edge; 235-transition arc; 236-a recess; 2361-a first bore section; 2362-a second bore section; 237-a second surface; 238-a second attachment zone; 239-side; 24-a first insulator; 241-a first opening; 242-a bottom wall; 243-convex part; 244 — a second opening; 245-a side wall; 246-top wall; 25-a second insulator; 26-a third insulator; 200-a controller; 300-a motor; 1000-vehicle.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions.

The terms "first," "second," and the like in the description and claims of this application or in the foregoing drawings are used for distinguishing between different elements and not for describing a particular sequential or chronological order.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "attached" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

The "plurality" in the present application means two or more (including two), and similarly, "plural" means two or more (including two) and "plural" means two or more (including two).

In this application, reference to a battery refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery module or a battery pack, etc.

The battery monomer comprises an electrode assembly and electrolyte, wherein the electrode assembly comprises a positive pole piece, a negative pole piece and an isolating membrane. The battery cell mainly depends on metal ions to move between the positive pole piece and the negative pole piece to work. The positive pole piece comprises a positive pole current collector and a positive pole active substance layer, wherein the positive pole active substance layer is coated on the surface of the positive pole current collector, and the current collector which is not coated with the positive pole active substance layer is used as a positive pole lug. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative pole piece includes negative current collector and negative active material layer, and the negative active material layer coats in the surface of negative current collector, and the mass flow body that does not coat the negative active material layer is as negative pole utmost point ear. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the high current can be passed through without fusing, a plurality of positive electrode tabs are stacked together, and a plurality of negative electrode tabs are stacked together. The material of the isolation film may be PP (polypropylene) or PE (polyethylene).

The battery monomer also comprises a shell and an electrode leading-out piece, wherein the electrode leading-out piece is arranged on the shell so as to lead out the electric energy of the electrode assembly, the electrode leading-out piece can be an adapter sheet or an electrode terminal, when the electrode leading-out piece is the adapter sheet, the electrode terminal is electrically connected with a lug through the adapter sheet, and when the electrode leading-out piece is the electrode terminal, the lug is electrically connected with the electrode terminal.

In the development of battery technology, various design factors, such as performance parameters including energy density, discharge capacity, charge/discharge rate, etc., must be considered, and battery safety must be considered.

The safety of the battery monomer mainly comprises short circuit of the positive electrode and the negative electrode, leakage of the shell, explosion and fire caused by overhigh internal pressure or temperature of the battery monomer, and the like.

The inventor finds that the short circuit of the positive electrode and the negative electrode is mainly caused by overlapping with conductive parts (such as electrode terminals, adapter plates, pole lugs, pole pieces and the like) after the active material layer of the pole piece falls off. In the single use process of battery, because single battery receives the vibration, electrode subassembly takes place the position for the shell and removes, and electrode subassembly and other parts (such as insulation system etc.) extrusion and the scratch in shell or the shell lead to the active material layer of pole piece to drop, and the active material layer after dropping and electrically conductive part (such as electrode terminal, switching piece etc.) overlap joint short circuit. For example, when the electrode assembly is disposed above the electrode lead-out member, the dropped active material layer is likely to fall to the electrode lead-out member, and is in lap joint with the electrode lead-out member, thereby causing a safety risk.

In view of this, in order to solve the problem that the safety of the battery cell is low due to the internal short circuit of the battery cell, the inventors have conducted intensive research and designed a technical scheme that an insulating member is covered on the surface of the electrode lead-out member facing the main body of the electrode assembly, the insulating effect of the electrode lead-out member is improved by the insulating member, and then the risk of the lap short circuit between the fallen active material layer and the electrode lead-out member is reduced.

In such a battery cell, no matter the electrode assembly is disposed above or below the electrode lead-out member, after the active material layer is separated from the current collector, even if the dropped active material layer moves toward the surface of the electrode lead-out member facing the main body of the electrode assembly, the dropped active material layer is isolated from the electrode lead-out member due to the presence of the insulating member, so that the risk of overlap short circuit between the dropped active material layer and the electrode lead-out member is reduced, and the battery cell has high safety.

The battery cell disclosed in the embodiment of the application can be used in electric equipment such as vehicles, ships or aircrafts, but not limited to. The power supply system including the battery cell, the battery, and the like disclosed in the present application may be used.

The embodiment of the application provides an electric device using a battery cell as a power supply, and the electric device can be but is not limited to a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, an electric automobile, a ship, a spacecraft and the like. The electric toy may include a stationary or mobile electric toy, such as a game machine, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

For convenience of description, the following embodiments are described by taking an electric device of an embodiment of the present application as an example of a vehicle 1000.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle according to some embodiments of the present disclosure. The vehicle 1000 may be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile may be a pure electric automobile, a hybrid electric automobile, or a range-extended automobile, etc. The battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom or the head or the tail of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000, for example, the battery 100 may be used as an operation power supply of the vehicle 1000 for a circuit system of the vehicle 1000, for example, for power demand for operation in starting, navigation, and running of the vehicle 1000.

The vehicle 1000 may further include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to supply power to the motor 300, for example, for starting, navigation, and operational power requirements while the vehicle 1000 is traveling.

In some embodiments of the present application, the battery 100 may be used not only as an operating power source of the vehicle 1000, but also as a driving power source of the vehicle 1000, instead of or in part of fuel or natural gas, to provide driving power for the vehicle 1000.

Referring to fig. 2, fig. 2 is an exploded view of a battery according to some embodiments of the present disclosure. The battery 100 includes a case 10 and a battery cell 20, and the battery cell 20 is accommodated in the case 10. The case 10 is used to provide a receiving space for the battery cell 20, and the case 10 may have various structures. In some embodiments, the case 10 may include a first sub-case 11 and a second sub-case 12, the first sub-case 11 and the second sub-case 12 cover each other, and the first sub-case 11 and the second sub-case 12 together define a receiving space for receiving the battery cell 20. The second sub-box 12 may be a hollow structure with an opening at one end, the first sub-box 11 may be a plate-shaped structure, and the first sub-box 11 covers the opening side of the second sub-box 12, so that the first sub-box 11 and the second sub-box 12 jointly define an accommodating space; the first sub-box 11 and the second sub-box 12 may be both hollow structures with one side open, and the open side of the first sub-box 11 is covered on the open side of the second sub-box 12.

In the battery 100, there may be a plurality of battery cells 20, and the plurality of battery cells 20 may be connected in series or in parallel or in series-parallel, where in series-parallel refers to both series connection and parallel connection among the plurality of battery cells 20. The plurality of battery cells 20 can be directly connected in series or in parallel or in series-parallel, and the whole formed by the plurality of battery cells 20 is accommodated in the box body 10; of course, the battery 100 may also be formed by connecting a plurality of battery cells 20 in series, in parallel, or in series-parallel to form a battery module, and then connecting a plurality of battery modules in series, in parallel, or in series-parallel to form a whole, and accommodating the whole in the case 10. The battery 100 may further include other structures, for example, the battery 100 may further include a bus member for achieving electrical connection between the plurality of battery cells 20.

The battery cell 20 may be a secondary battery or a primary battery; the battery cell 20 may also be a lithium sulfur battery, a sodium ion battery, or a magnesium ion battery, but is not limited thereto.

Referring to fig. 3, fig. 3 is an exploded view of a battery cell according to some embodiments of the present disclosure. As shown in fig. 3, the battery cell 20 includes a case 21, an electrode assembly 22, and electrode terminals 23b. The housing 21 includes a case body 211 and a cover body 212, the case body 211 having an opening, and the cover body 212 closing the opening to isolate the internal environment of the battery cell 20 from the external environment.

The case 211 is an assembly for cooperating with the cover 212 to form an internal environment of the battery cell 20, wherein the formed internal environment may be used to house the electrode assembly 22, the electrolyte, and other components. The housing 211 and the cover 212 may be separate components. The housing 211 may be a variety of shapes and a variety of sizes. Specifically, the shape of the case 211 may be determined according to the specific shape and size of the electrode assembly 22. The material of the housing 211 may be various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not limited in this embodiment. The embodiment of the present application is described by taking the case 211 as a rectangular parallelepiped.

The cover 212 refers to a member that covers an opening of the case 211 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the cover 212 may be adapted to the shape of the housing 211 to fit the housing 211. Alternatively, the cover 212 may be made of a material (e.g., an aluminum alloy) having certain hardness and strength, so that the cover 212 is not easily deformed when being impacted by a press, and the battery cell 20 has higher structural strength and improved safety. The lid 212 may be provided with functional members such as the electrode terminal 23b. The electrode terminal 23b may be used to electrically connect with the electrode assembly 22 for outputting or inputting electric power of the battery cell 20. The cover 212 may be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which are not limited in this embodiment. In some embodiments, an insulating structure may also be provided on the inside of the cover 212, which may be used to isolate the electrical connection components within the housing 211 from the cover 212 to reduce the risk of short circuits. Illustratively, the insulating structure may be plastic, rubber, or the like.

The electrode assembly 22 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 22 may be contained within the housing 211. The electrode assembly 22 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is usually disposed between the positive electrode sheet and the negative electrode sheet to separate the positive electrode sheet and the negative electrode sheet from each other, so as to prevent internal short circuit between the positive electrode sheet and the negative electrode sheet. The active material-containing portions of the positive and negative electrode plates form a main body 221 of the electrode assembly, and the inactive material-free portions of the positive and negative electrode plates form tabs 222. The positive and negative electrode tabs may be located together at one end of the main body 221 or at both ends of the main body 221, respectively. During the charge and discharge of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab 222 is connected to the electrode terminal 23b to form a current loop.

Referring to fig. 3, and further referring to fig. 4 and fig. 5, fig. 4 is a schematic structural view of an electrode lead-out member and a first insulating member according to some embodiments of the present disclosure, and fig. 5 is a schematic assembly view of the electrode lead-out member and the first insulating member according to some embodiments of the present disclosure. According to some embodiments of the present application, there is provided a battery cell 20, the battery cell 20 including an electrode assembly 22, an electrode lead-out 23, and a first insulator 24. The electrode assembly 22 includes a main body 221 and tabs 222 extending from the main body 221; the electrode lead-out member 23 is connected with the tab 222 to lead out electrical energy of the electrode assembly 22, the electrode lead-out member 23 having a first surface 231 facing the main body 221; the first insulator 24 covers at least a portion of the first surface 231.

The portions of the positive and negative electrode sheets having active materials constitute a main body 221 of the electrode assembly 22, and the portions of the positive and negative electrode sheets having no active materials each constitute a tab 222.

The electrode assembly 22 includes a positive electrode tab and a negative electrode tab, which may extend from one side of the main body 221, or may extend from both sides of the main body 221. Optionally, a positive electrode tab and a negative electrode tab extend from one side of the main body 221. It should be noted that two electrode lead-out members 23 are provided, and the two electrode lead-out members 23 correspond to the positive electrode tab and the negative electrode tab, respectively.

The electrode lead-out member 23 is a conductive member for electrically connecting with the tab 222 to lead out electrical energy of the electrode assembly 22. The electrode lead-out member 23 may be an interposer or an electrode terminal, and when the electrode lead-out member 23 is an interposer, the interposer connects the tab 222 and the electrode terminal; when the electrode lead-out member 23 is an electrode terminal, the electrode terminal is connected to the tab 222.

The material of the electrode lead-out member 23 may be copper, aluminum, or the like.

The first surface 231 is a surface of the electrode lead-out 23 facing the main body 221, in other words, the first surface 231 may be a surface of the electrode lead-out 23 close to the main body 221.

The first insulating member 24 is an electrical insulating member, and the material of the first insulating member 24 may be plastic, such as PP (polypropylene) or PE (polyethylene).

The first insulating member 24 covers the first surface 231, and the first insulating member 24 is attached to the first surface 231.

The first insulator 24 may cover a portion of the first surface 231, or the first insulator 24 may cover the entire first surface 231 (except for a connection region of the first surface 231 with the tab 222).

According to the battery cell 20 of the embodiment of the present application, the electrode lead-out member 23 has the first surface 231 facing the main body 221 of the electrode assembly 22, and at least a part of the first surface 231 is covered by the first insulating member 24, so that the insulating effect between the first surface 231 and the main body 221 of the electrode assembly 22 is improved, the risk of overlapping short circuit between the fallen active material layer and the electrode lead-out member 23 is reduced, and the battery cell 20 has high safety.

Referring to fig. 4 and 5, according to some embodiments of the present disclosure, the first insulating member 24 is provided with a first opening 241 opposite to the first surface 231, the electrode lead-out member 23 includes a first connection region 232 exposed from the first opening 241, and the first connection region 232 is connected to the tab 222 (see fig. 3).

The first opening 241 is an opening disposed on the first insulating member 24 and opposite to the first surface 231, and the first opening 241 may penetrate through the first insulating member 24 in a direction intersecting the first surface 231 to expose the first connection region 232.

The first connection region 232 is a region of the electrode lead-out 23 for connection to the tab 222, and the region of the first surface 231 corresponding to the first connection region 232 is connected to the tab 222.

The first connection region 232 may be welded to the tab 222, or the first connection region 232 may be adhesively connected to the tab 222 by conductive adhesive. Optionally, the first connection region 232 is connected to the tab 222 by welding, so that the tab 222 is firmly connected to the electrode lead-out 23.

It should be noted that the first connection region 232 is only the region where the weld mark is formed after the tab 222 is welded to the electrode lead-out member 23, and it can be understood that after the tab 222 is connected to the first connection region 232, a first insulating member 24 is disposed between the tab 222 and the electrode lead-out member 23 in the thickness direction of the electrode lead-out member 23, and the first insulating member 24 is located in the region where the tab 222 is not welded to the electrode lead-out member 23. The thickness of the first insulator 24 is thin, and has little influence on the total thickness of the tab 222 after assembly with the electrode lead-out 23.

In the above solution, the first opening 241 is disposed opposite to the first surface 231 and exposes the first connection region 232 for connecting the electrode lead-out member 23 with the tab 222, so as to reduce the risk that the first insulating member 24 affects the connection between the electrode lead-out member 23 and the tab 222.

According to some embodiments of the present application, the first insulator 24 is injection molded to the electrode lead-out 23.

When the first insulating member 24 is injection molded on the electrode lead-out member 23, the electrode lead-out member 23 is placed in a corresponding mold, and then the molten plastic is poured into the mold, so that the molten plastic is attached to the electrode lead-out member 23 after being cooled and solidified.

In the above solution, the first insulating member 24 is injection molded on the electrode lead-out member 23, so as to facilitate processing and manufacturing, and the first insulating member 24 is stably connected with the electrode lead-out member 23.

Referring to fig. 3 to 5, according to some embodiments of the present application, the electrode assembly 22 is provided with at least two, the electrode lead-out member 23 includes a body 233 and at least two extensions 234, the extensions 234 extend from a first edge 2331 of the body 233, the number of extensions 234 is equal to the number of electrode assemblies 22, and the extensions 234 are used to connect with the tabs 222.

The number of the electrode assemblies 22 is at least two, and at least two electrode assemblies 22 may be stacked in the thickness direction of the electrode assemblies 22 to reduce the space occupation.

The body 233 and the extension 234 are constituent parts of the electrode assembly 22, the body 233 being used for connection with other components (e.g., electrode terminals, a case, etc.), and the extension 234 being used for connection with the tab 222.

The number of extension portions 234 is equal to the number of electrode assemblies 22, and one extension portion 234 may correspond to each electrode assembly 22. In other embodiments, the number of extensions 234 may be less than the number of electrode assemblies 22, and each extension 234 may correspond to one electrode assembly 22 or two electrode assemblies 22.

The extension 234 may be welded to the tab 222, or the extension 234 may be adhesively connected to the tab 222 by conductive adhesive. Optionally, the extension 234 is welded to the tab 222, so that the extension 234 is firmly connected to the tab 222.

In the above aspect, the number of the extension portions 234 is at least two so as to fit a plurality of electrode assemblies 22 so as to accomplish the connection of the tab 222 with the electrode lead-out 23.

Referring to fig. 5 and 6, fig. 6 is a top view of an electrode lead-out member and a first insulating member provided in some embodiments of the present disclosure after assembly, and a dotted line in fig. 6 is an outline of the electrode lead-out member. According to some embodiments of the present application, the extension portion 234 and the body 233 are aligned along the first direction X, and the first insulator 24 is beyond an end of the extension portion 234 away from the body 233 or flush with an end of the extension portion 234 away from the body 233 along the first direction X.

In the drawing, the direction indicated by the letter X may be the first direction.

The at least two extending portions 234 are arranged at intervals in the second direction Y, and the second direction Y, the first direction X, and the thickness direction Z of the electrode lead-out member 23 intersect each other two by two.

Alternatively, the second direction Y, the first direction X, and the thickness direction Z of the electrode lead-out 23 are perpendicular two by two.

At the body 233, the first insulator 24 may extend from one end to the other end of the first surface 231 in the second direction Y; at the extension, the first insulator 24 may extend from one end to the other end of the first surface 231 in the second direction Y except for the area of the first surface 231 for connecting the tab 222.

Along the first direction X, the first insulator 24 exceeds an end of the extension portion 234 away from the body 233 or is flush with an end of the extension portion 234 away from the body 233, that is, the first insulator 24 completely covers the extension portion 234 along the first direction X.

In the above solution, the first insulating member 24 exceeds the end of the extending portion 234 away from the body 233 or is flush with the end of the extending portion 234 away from the body 233, so that the first insulating member 24 has a larger covering area on the first surface 231, and the insulating effect of the first insulating member 24 on the first surface 231 is further improved.

Referring to fig. 4 to 6, according to some embodiments of the present disclosure, the extension portions 234 and the body 233 are arranged along the first direction X, a side of each of two adjacent extension portions 234 adjacent to each other has a second edge 2341, the first edge 2331 and the second edge 2341 are connected by a transition arc 235, and the first insulating member 24 covers the transition arc 235.

The first edge 2331 may be a surface of the body 233 that intersects the first direction X.

The extension parts 234 and the body 233 are arranged in the first direction X to make good use of the inner space of the battery cell 20 so that the extension parts 234 are coupled to the tab 222.

At least two extending portions 234 are arranged at intervals along the second direction Y, the first direction X and the thickness direction Z of the electrode lead-out member 23 intersect with each other in pairs, and two adjacent extending portions 234 are arranged oppositely in the second direction Y.

The second edge 2341 is an edge of the extension 234 that is adjacent to the adjacent extension 234, and an extension line of the second edge 2341 intersects the first edge 2331. The second edge 2341 may be a surface of the extension 234 that intersects the second direction Y.

The transition arc 235 is an arc surface, and the transition arc 235 connects the first edge 2331 and the second edge 2341 to realize the arc transition between the first edge 2331 and the second edge 2341.

The first insulating member 24 surrounds the transition arc 235, which means that the first insulating member 24 surrounds the transition arc 235 in the thickness direction Z of the electrode lead-out member 23.

In the above solution, the second edge 2341 is connected to the first edge 2331 by the transition arc 235, which is convenient for manufacturing; the first insulating member 24 covers the transition arc 235 to enhance the connection strength between the extension portion 234 and the body 233, and reduce the risk of the connection between the extension portion 234 and the body 233 being damaged by force.

Referring to FIG. 6, according to some embodiments of the present disclosure, between two adjacent extensions 234, the first insulating member 24 exceeds the first edge 2331 along the first direction X by a distance L, and the radius of the transition arc 235 is R, such that L ≧ R.

When at least two of the extending portions 234 are arranged at intervals along the second direction Y, a gap is formed between two adjacent extending portions 234, and a part of the first insulating member 24 may be disposed in the gap. A portion of the first insulator 24 located in the gap may not extend to an end of the extension 234 away from the body 233 to reduce material waste.

The first insulating member 24 covers the first edge 2331 of the body 233 between two adjacent extensions 234 and a portion of the second edge 2341 of the extensions 234.

In the above solution, the distance between two adjacent extensions 234 and the first insulator 24 beyond the first edge 2331 along the first direction X is greater than or equal to the radius of the transition arc 235, so as to further enhance the connection strength between the extensions 234 and the body 233, and reduce the risk of the connection between the extensions 234 and the body 233 being damaged by force.

Referring to fig. 7, fig. 7 isbase:Sub>A sectional view taken along the directionbase:Sub>A-base:Sub>A of fig. 6. According to some embodiments of the present application, the first insulating member 24 includes a bottom wall 242 and a convex portion 243 connected to each other, the bottom wall 242 covers at least a portion of the first surface 231, the electrode lead-out member 23 is provided with a concave portion 236, and the convex portion 243 and the concave portion 236 are fitted to each other.

The bottom wall 242 may cover a portion of the first surface 231, or the bottom wall 242 may cover the entirety of the first surface 231 (except for the connection area of the first surface 231 with the tab 222).

The convex portion 243 is a portion formed on the bottom wall 242 and protruding toward the first surface 231.

The convex portion 243 and the concave portion 236 may be fitted to each other by injection molding the first insulating material 24 and the electrode lead-out member 23, that is, by coating the material constituting the first insulating material 24 on the electrode lead-out member 23 in a molten state and then solidifying to form the bottom wall 242 and the convex portion 243, so that the convex portion 243 and the concave portion 236 are fitted to each other.

In the above-described embodiment, the convex portion 243 and the concave portion 236 are fitted to each other, so that the first insulator 24 is not easily disconnected from the electrode lead-out member 23, and the first insulator 24 and the electrode lead-out member 23 are firmly assembled.

Referring to fig. 6 and 7, according to some embodiments of the present disclosure, the electrode lead-out 23 further has a second surface 237 facing away from the main body 221, and the recess 236 is a through hole penetrating the first surface 231 and the second surface 237.

The second surface 237 and the first surface 231 are two surfaces oppositely disposed in the thickness direction Z of the electrode lead-out member 23.

The through hole is a hole penetrating the first surface 231 and the second surface 237, that is, the through hole communicates the first surface 231 and the second surface 237. A projection 243 is formed on the bottom wall 242 and projects toward a side of the bottom wall 242 facing away from the electrode assembly 22 so that the projection 243 and the through-hole are fitted to each other.

The concave portion 236 is a through hole so that a convex portion 243, which is fitted to the concave portion 236, can extend from the first surface 231 to the second surface 237, the convex portion 243 not exceeding the second surface 237. Optionally, the protrusion 243 is flush with the second surface 237.

The number of the through holes can be multiple, the through holes are distributed at intervals, and the distribution positions can be in various forms. The shape of the through-hole may be various shapes, for example, circular, square, irregular, etc.

In the above solution, the recess 236 is a through hole, which is convenient for processing and manufacturing and has low manufacturing cost.

Referring to fig. 7, according to some embodiments of the present disclosure, the through hole includes a first hole section 2361, and a cross-sectional area of the first hole section 2361 is gradually increased along a direction that the first surface 231 points to the second surface 237.

The sectional area of the first hole portion 2361 refers to an area of the first hole portion 2361 cut by a surface parallel to the first surface 231, the sectional area of the first hole portion 2361 gradually increases along a direction in which the first surface 231 points to the second surface 237, and similarly, the sectional area of the protrusion 243 engaged with the first hole portion 2361 gradually increases along a direction in which the first surface 231 points to the second surface 237, and the protrusion 243 fills the through hole, so that the first insulator 24 is not easily separated from the electrode lead-out member 23 from a direction in which the second surface 237 points to the first surface 231.

In the above solution, the cross-sectional area of the first hole portion 2361 is the area of the first hole portion 2361 cut by the surface parallel to the first surface 231, the cross-sectional area of the first hole portion 2361 gradually increases along the direction from the first surface 231 to the second surface 237, and after the protrusion 243 and the through hole are fitted to each other, the connection strength of the first insulator 24 and the electrode lead-out member 23 in the thickness direction Z of the electrode lead-out member 23 is further enhanced, and the connection stability of the first insulator 24 and the electrode lead-out member 23 is ensured.

Optionally, as shown in fig. 7, the through hole further includes a second hole segment 2362, where the second hole segment 2362 is connected to an end of the first hole segment 2361 close to the first surface 231, that is, the second hole segment 2362 and the first hole segment 2361 are sequentially distributed from the first surface 231 to the direction of the second surface 237. The cross-sectional area of the second hole segment 2362 is constant from the first surface 231 to the second surface 237, for example, the second hole segment 2362 may be a constant diameter segment.

According to some embodiments of the present application, the through hole may also be a stepped hole having a large diameter section adjacent to the second surface 237 relative to a small diameter section.

Referring to fig. 4 to 6, according to some embodiments of the present disclosure, the electrode lead-out 23 further has a second surface 237 facing away from the main body 221 and a side surface 239 connecting the first surface 231 and the second surface 237, the first insulator 24 includes a bottom wall 242 and a side wall 245, the bottom wall 242 covers at least a portion of the first surface 231, the side wall 245 protrudes from an edge of the bottom wall 242 in a direction facing away from the electrode assembly 22, and the side wall 245 covers at least a portion of the side surface 239.

The second surface 237 and the first surface 231 are disposed opposite to each other in the thickness direction Z of the electrode lead-out 23, and a side surface 239 connects the second surface 237 and the first surface 231, and the side surface 239 may be an edge of the electrode lead-out 23. In the drawing, the direction indicated by the letter X is parallel to the thickness direction of the interposer 23a.

The bottom wall 242 and the side wall 245 are two components of the first insulating member 24, the bottom wall 242 is disposed opposite to the first surface 231, the bottom wall 242 covers the first surface 231, the side wall 245 protrudes from an edge of the bottom wall 242 in a direction away from the electrode assembly 22, and the side wall 245 covers an edge of the electrode lead-out member 23 extending in the thickness direction Z of the electrode lead-out member 23.

In embodiments where the electrode lead-out 23 comprises a body 233 and at least two extensions 234, the sidewall 245 may wrap around the edges of the body 233 and the extensions 234.

Along the protruding direction of the sidewall 245, the sidewall 245 may cover a portion of the side 239, and the sidewall 245 may cover the whole of the side 239.

The side wall 245 may be disposed around the contour of the electrode lead-out 23 in the extending direction of the contour of the electrode lead-out 23, so that the side wall 245 and the electrode lead-out 23 have a large connecting area.

In the above solution, the sidewall 245 covers at least a portion of the side surface 239, and the connection area between the first connection member and the electrode lead-out member 23 is increased, so that the first insulation member 24 and the electrode lead-out member 23 have better connection stability, and the insulation effect of the first insulation member 24 on the electrode lead-out member 23 is improved.

Referring to fig. 4-6, according to some embodiments of the present disclosure, the first insulator 24 further includes a top wall 246, the top wall 246 covers a portion of the second surface 237, and the top wall 246 is connected to the bottom wall 242 by a side wall 245.

The top wall 246 is disposed opposite to the bottom wall 242 in the thickness direction of the interposer 23a, and the top wall 246 is disposed opposite to the second surface 237.

In the above solution, the top wall 246 covers a portion of the second surface 237, and the side wall 245 connects the top wall 246 and the bottom wall 242, so that the bottom wall 242 is not easily separated from the first surface 231.

According to some embodiments of the present application, the top wall 246, the side wall 245, and the bottom wall 242 may be integrally formed such that the first insulating member 24 is securely coupled with the electrode lead-out member 23.

Referring to fig. 3, according to some embodiments of the present disclosure, the battery cell 20 further includes an electrode terminal 23b, and the electrode lead-out member 23 is an adaptor 23a electrically connecting the electrode terminal 23b and the tab 222.

In the above solution, the electrode lead-out member 23 is an adaptor sheet 23a, which facilitates connection between the electrode terminal 23b and the tab 222, and facilitates leading out of electric energy of the electrode assembly 22.

Referring to fig. 3 to 5, according to some embodiments of the present disclosure, the first insulating member 24 is provided with a second opening 244, the interposer 23a includes a second connection region 238 corresponding to the second opening 244, and the second connection region 238 is connected to the electrode terminal 23b.

The second opening 244 is disposed opposite to the first surface 231, and the second opening 244 exposes the second connection region 238.

The second connection region 238 and the electrode terminal 23b may be welded together, for example, from the side of the interposer 23a facing away from the electrode terminal 23b, at the second connection region 238, to the electrode terminal 23b.

In the above-described aspect, the second opening 244 is provided so as to achieve the connection of the second connection region 238 to the electrode terminal 23b.

Referring to fig. 3 and 4, according to some embodiments of the present disclosure, the battery cell 20 further includes a second insulating member 25, and the second insulating member 25 is disposed on the first surface 231 and covers the second connection region 238.

The second insulating member 25 is an electrically insulating member, and the material of the second insulating member 25 may be the same as that of the first insulating member 24 or may be different from that of the first insulating member 24. The second insulating member 25 serves to cover the second connection region 238 after the electrode lead-out member 23 is connected to the electrode terminal 23b, so as to prevent the second connection region 238 from being exposed.

The second insulating member 25 may be connected to the first surface 231 in various manners, for example, the second insulating member 25 may be adhesively connected to the first surface 231, or the second insulating member 25 may be heat-melted and molded on the first surface 231. When the second insulating member 25 is adhesively attached to the first surface 231, the second insulating member 25 may be an adhesive tape that is adhesively attached to the first surface 231; alternatively, the second insulating member 25 may be an insulating paste applied to the second connection region 238 and adhesively connected to the first surface 231.

In the above scheme, the second insulating member 25 is disposed on the first surface 231 and covers the second connection region 238, so that the insulating effect of the first surface 231 is further improved, and the risk of internal short circuit of the battery cell 20 is reduced.

According to some embodiments of the present application, the second insulator 25 is connected to the first insulator 24.

The second insulating member 25 and the first insulating member 24 may be connected in various ways, for example, the second insulating member 25 and the first insulating member 24 are connected in a snap-fit manner, or the second insulating member 25 and the first insulating member 24 are connected in an adhesive manner. When the second insulating member 25 is bonded to the first insulating member 24, the second insulating member 25 may be an adhesive tape or an insulating adhesive, which is simple in structure and convenient to operate.

In the above solution, the second insulating member 25 is connected to the first insulating member 24, so as to reduce the risk of the second insulating member 25 being separated from the interposer 23a. The second insulating member 25 may be an adhesive tape, or the second insulating member 25 may be an insulating adhesive.

Referring to fig. 3, according to some embodiments of the present application, the second insulating member 25 fills the second opening 244.

The second insulating member 25 fills the second opening 244, and the second insulating member 25 closes the second opening 244 such that the second connection region 238 is shielded at a side of the first surface 231.

The second insulating member 25 may be an insulating paste, which has better plasticity, has a better attaching effect with the first surface 231, and has a better sealing effect on the second opening 244. The second insulator 25 can also be formed by a molten plastic that is poured into the second opening 244 and then solidified.

In the above solution, the second insulating member 25 fills the second opening 244, and the second insulating member 25 and the first insulating member 24 cooperate to completely cover the region of the first insulating member 24 exposed by the second connection region 238, so as to reduce the risk of short circuit caused by the peeled off active material layer entering the second opening 244.

Referring to fig. 3, according to some embodiments of the present disclosure, the electrode lead-out member 23 includes a first connection region 232 for connecting with the tab 222, and the second insulating member 25 and the first insulating member 24 completely cover the first surface 231 except the first connection region 232.

The first connection region 232 is the region of the electrode lead-out 23 for connection to the tab 222. When the electrode lead-out member 23 is an interposer 23a, the first connection region 232 is a region of the interposer 23a for connection to the tab 222.

In the above solution, the second insulating part 25 and the first insulating part 24 completely cover the area of the first surface 231 except the first connection area 232, so that the first surface 231 has a larger insulating area, and the insulating effect of the first surface 231 is further improved.

Referring to fig. 8, fig. 8 is an assembly diagram of an electrode lead-out member and a first insulating member according to another embodiment of the present disclosure. According to some embodiments of the present application, the electrode lead-out 23 is an electrode terminal 23b.

In the above scheme, the electrode lead-out member 23 is the electrode terminal 23b, the structure is simple, and the utilization rate of the internal space of the battery cell 20 is high, so that the battery cell 20 has high energy density.

Referring to fig. 3, and further referring to fig. 9 and 10, fig. 9 is a schematic connection diagram of a tab and an interposer provided in some embodiments of the present application, fig. 10 is a schematic connection diagram of a tab and an electrode terminal provided in some embodiments of the present application, fig. 3 shows the tab in a folded state, and fig. 9 and 10 show the tab in an unfolded state. According to some embodiments of the present application, the tab 222 is a bent structure, and the battery cell 20 further includes a third insulating member 26, wherein the third insulating member 26 is disposed inside the bent tab 222.

The third insulating member 26 is an electrically insulating member, and the third insulating member 26 may be an adhesive tape.

After the tab 222 is connected to the electrode lead-out 23, the third insulating member 26 is attached to the side of the tab 222 facing away from the electrode lead-out 23, and after the tab 222 is bent, the third insulating member 26 is positioned inside the tab 222. After the tab 222 is bent, the inner surface of the tab 222 is disposed to face the body 221.

In the above scheme, the third insulating member 26 is disposed on the inner side of the bent tab 222, so as to enhance the insulating effect on the inner side of the tab 222, and further reduce the risk of internal short circuit of the battery cell 20.

Referring to fig. 9 and 10, according to some embodiments of the present application, the third insulating member 26 extends to the main body 221.

One end of the third insulating member 26 covers the inside of the tab 222 and the other end of the third insulating member 26 extends toward the main body 221 and covers a portion of the main body 221, so that the third insulating member 26 has a longer size and a larger connection area with the electrode assembly 22.

In the above aspect, the third insulating member 26 extends to the main body 221, improving the connection stability of the third insulating member 26 with the electrode assembly 22.

According to some embodiments of the present application, there is also provided a battery including the battery cell 20 provided in any of the above embodiments.

According to some embodiments of the present application, the present application further provides an electric device, including the battery cell 20 provided in any of the above embodiments, where the battery cell 20 is used to provide electric energy.

The electric equipment is any one of the above devices or systems using the battery cell 20.

According to some embodiments of the present application, referring to fig. 3 to 10, the present application provides a battery cell 20, the battery cell 20 having a rectangular parallelepiped shape, the battery cell 20 including a case 21, an electrode assembly 22, an electrode lead-out member 23, a first insulating member 24, a second insulating member 25, a third insulating member 26, and an electrode terminal 23b.

The housing 21 includes a case 211 and a cover 212, the case 211 having an opening, and the cover 212 closing the opening of the case 211.

The electrode assembly 22 is disposed in the case 211, and the electrode assembly 22 includes a main body 221 and tabs 222 extending from the main body 221. The electrode terminal 23b is provided on the lid body 212, the electrode lead-out member 23 is electrically connected to the tab 222 and the electrode terminal 23b to lead out electric energy of the electrode assembly 22, and the electrode lead-out member 23 is an interposer 23a.

The electrode lead-out member 23 includes a main body 233 and two extending portions 234, the two extending portions 234 and the main body 233 are arranged along the first direction X, the two extending portions 234 are distributed at intervals along the second direction Y, and the second direction Y, the first direction X and the thickness direction Z of the electrode lead-out member 23 are perpendicular to each other. The electrode assembly 22 is provided in two, and the tab 222 of each electrode assembly 22 is coupled to one of the extensions 234. The electrode lead-out 23 has a first surface 231 facing the main body 221, a second surface 237 facing away from the main body 221, and a side 239 connecting the first surface 231 and the second surface 237, the electrode lead-out 23 comprising a first connection zone 232 for connection to the tab 222 and a second connection zone 238 for connection to the electrode terminal 23b. The electrode lead-out 23 includes a recess 236, the recess 236 is a through hole penetrating the first surface 231 and the second surface 237, and the through hole has a first hole section 2361, and a cross-sectional area of the first hole section 2361 is gradually increased from the first surface 231 toward the second surface 237.

The first insulator 24 includes a bottom wall 242, a boss 243, a side wall 245, and a top wall 246. The bottom wall 242 is disposed opposite to the first surface 231, the bottom wall 242 is provided with a first opening 241 and a second opening 244, and the first opening 241 exposes the first connection region 232 for connecting the tab 222 with the first connection region 232; the second opening 244 corresponds to the second connection region 238. The convex portion 243 protrudes from the bottom wall 242 in a direction away from the electrode assembly 22, and the convex portion 243 and the concave portion 236 are fitted to each other. Side wall 245 is connected to an edge of bottom wall 242 and extends away from electrode assembly 22, side wall 245 wraps around side 239 and a portion of side wall 245 is located between extensions 234, and side wall 245 wraps around the connection of extensions 234 to body 233. The top wall 246 is disposed opposite the second surface 237, the top wall 246 covers the extension 234 and a portion of the body 233, and the top wall 246 exposes the second attachment area 238. The first insulator 24 is injection molded to the electrode lead-out member 23.

The second insulating member 25 fills the second opening 244 to cover the second connection region 238, and the second insulating member 25 cooperates with the first insulating member 24 to cover the first surface 231 except for the first connection region 232.

The third insulating member 26 is disposed on the inner side of the tab 222 after being bent, and the third insulating member 26 extends to the main body 221.

According to the battery cell 20 of the embodiment of the present application, the first insulating member 24 and the second insulating member 25 cover the first surface 231 except the first connection region 232, so that one side of the electrode lead-out member 23 facing the main body 221 has a good insulating effect, and particularly, when the electrode assembly 22 is disposed above the electrode lead-out member 23, the detached active material layer is not easily overlapped and shorted with the electrode lead-out member 23, so that the battery cell 20 has high safety.

The battery cell 20, the battery, and the electric device are described above, and the method for manufacturing the battery cell according to the embodiment of the present application will be described below, in which portions not described in detail may be referred to in the foregoing embodiments.

Fig. 11 shows a schematic flow diagram of a method of manufacturing a battery cell according to some embodiments of the present application. As shown in fig. 11, the method 400 of manufacturing a battery cell may include:

410, providing an electrode lead-out 23, wherein the first surface 231 of the electrode lead-out 23 is covered with the first insulating member 24 and exposes the first connection region 232;

420 connecting the tab 222 of the electrode assembly 22 with the first connection region 232;

430, the tab 222 is bent such that the first surface 231 faces the main body 221 of the electrode assembly 22.

In step 410, the electrode lead-out 23 is provided, the first surface 231 of the electrode lead-out 23 is covered with the first insulating member 24 and exposed in the first connection region 232", the first insulating member 24 further covers the side surface 239 and a portion of the second surface 237 of the electrode lead-out 23, and the first insulating member 24 is injection molded on the electrode lead-out 23.

According to the method 400 for manufacturing the battery cell in the embodiment of the application, the first surface 231 is covered with the first insulating member 24, and the first connection region 232 is exposed out of the first surface 231, so that the tab 222 is conveniently connected with the first connection region 232, the insulating effect of the first surface 231 can be enhanced, the risk of overlapping short circuit between the fallen active material layer and the electrode leading-out member 23 is reduced, and the battery cell 20 has high safety.

Fig. 12 is a schematic flow chart illustrating a method of manufacturing a battery cell according to another embodiment of the present application. According to some embodiments of the present application, the electrode lead-out 23 is an interposer 23a; providing the electrode lead-out 23, wherein the first surface 231 of the electrode lead-out 23 is covered with the first insulating member 24 and exposes the first connection region 232, and the method comprises the following steps: 410a, providing an electrode lead-out 23, wherein a first surface 231 of the electrode lead-out 23 is covered with a first insulating member 24 and exposes a first connection region 232 and a second connection region 238; as shown in fig. 12, the method 400 of manufacturing a battery cell further includes:

440 connecting the electrode terminal 23b with the second connection region 238;

450 and a second insulating member 25 is disposed on the first surface 231 to cover the second connection region 238.

Step 440 of coupling the electrode terminal 23b with the second connection region 238, and step 450 of disposing the second insulating member 25 on the first surface 231 to cover the second connection region 238 may be disposed before the step 430 of bending the tab 222 such that the first surface 231 faces the main body 221 of the electrode assembly 22.

The first insulating member 24 is exposed at the first connection region 232 and the second connection region 238 so that the electrode lead-out member 23 is connected to the tab 222 and the electrode terminal 23b, the tab 222 and the electrode terminal 23b being located on both sides in the thickness direction Z of the electrode lead-out member 23.

The second insulating member 25 covers the second connection region 238 after the electrode lead-out member 23 is connected to the electrode terminal 23b, so as to reduce the risk of a short circuit between the dropped active material layer and the second connection region 238.

In the above solution, the electrode lead-out member 23 is the interposer 23a, the electrode tab 222 is electrically connected to the electrode terminal 23b through the electrode lead-out member 23, and the second insulating member 25 covers the area of the second connection region 238 on the first surface 231, so as to further improve the insulating effect of the first surface 231 and reduce the risk of internal short circuit of the battery cell 20.

According to some embodiments of the present application, the electrode lead-out 23 is an electrode terminal 23b.

In the above solution, the electrode lead-out member 23 is an electrode terminal 23b, and the tab 222 is connected to the electrode terminal 23b, so as to reduce the number of parts inside the battery cell 20, improve the space utilization inside the battery cell 20, and enable the battery cell 20 to have a higher energy density.

According to some embodiments of the present application, the method 400 of manufacturing a battery cell further comprises:

the third insulator 26 is coated on the surface of the tab 222 such that the third insulator 26 is disposed inside the bent tab 222 after the tab 222 is bent.

The step of covering the surface of the tab 222 with the third insulator 26 is provided before the step of bending the tab 222 such that the first surface 231 faces the main body 221 of the electrode assembly 22 at step 430. After the tab 222 is bent, the electrode lead-out member 23 and the main body 221 may be arranged in the thickness direction Z of the electrode lead-out member 23 so as to put the electrode lead-out member 23 into the case 211. After the tab 222 is bent, the inner surface of the tab 222 faces the body 221, and the third insulator 26 covers the inner surface of the tab 222.

In the above-described aspect, the risk of internal short circuit of the battery cell 20 is further reduced by covering the surface of the tab 222 on the inside of the bend with the third insulating member 26.

According to some embodiments of the present application, the method of manufacturing a battery cell further includes: before the electrode terminal 23b is connected to the second connection region 238 in step 440, the electrode terminal 23b is disposed on the cover 212; in step 460, after the surfaces of the bent inner sides of the bent tabs 222 are covered with the third insulating members 26", the electrode assembly 22 is placed in the case 211, and the cover 212 closes the opening of the case 211.

While the application has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the application. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.

Claims

1. A battery cell, comprising:

an electrode assembly including a main body and tabs extending from the main body;

an electrode lead-out member connected with the tab to lead out electrical energy of the electrode assembly, the electrode lead-out member having a first surface facing the main body;

a first insulator covering at least a portion of the first surface.

2. The battery cell as recited in claim 1 wherein the first insulator is provided with a first opening opposite the first surface, the electrode lead-out including a first connection region exposed through the first opening, the first connection region being connected to the tab.

3. The battery cell as recited in claim 1, wherein the first insulator is injection molded to the electrode lead-out member.

4. The battery cell as recited in claim 1, wherein the electrode assembly is provided in at least two, the electrode lead-out member includes a body and at least two extensions extending from a first edge of the body, the number of extensions being equal to the number of electrode assemblies, the extensions being for connection with the tabs.

5. The battery cell as recited in claim 4, wherein the extension and the body are aligned in a first direction in which the first insulator is flush with or beyond an end of the extension away from the body.

6. The battery cell as recited in claim 4, wherein the extension portions and the body are arranged along a first direction, a side of each adjacent two of the extension portions, which is close to each other, has a second edge, the first edge and the second edge are connected by a transition arc, and the first insulating member covers the transition arc.

7. The battery cell as recited in claim 6, wherein between two adjacent extending portions, the first insulating member extends beyond the first edge along the first direction by a distance L, and the radius of the transition arc is R, such that L ≧ R.

8. The battery cell according to claim 1, wherein the first insulating member includes a bottom wall and a convex portion connected to each other, the bottom wall covering at least a part of the first surface, the electrode lead-out member is provided with a concave portion, and the convex portion and the concave portion are fitted to each other.

9. The battery cell as recited in claim 8 wherein the electrode lead-out further has a second surface facing away from the body, the recess being a through hole extending through the first and second surfaces.

10. The battery cell as recited in claim 9, wherein the through-hole includes a first hole section having a cross-sectional area that gradually increases in a direction from the first surface toward the second surface.

11. The battery cell according to claim 1, wherein the electrode lead-out member further has a second surface facing away from the main body and a side surface connecting the first surface and the second surface, and the first insulating member includes a bottom wall covering at least a part of the first surface and a side wall protruding from an edge of the bottom wall in a direction facing away from the electrode assembly, the side wall covering at least a part of the side surface.

12. The battery cell of claim 11, wherein the first insulator further comprises a top wall covering a portion of the second surface, the top wall and the bottom wall being connected by the side wall.

13. The battery cell as recited in claim 1, further comprising an electrode terminal, wherein the electrode lead-out member is an interposer electrically connecting the electrode terminal and the tab.

14. The battery cell as recited in claim 13, wherein the first insulating member is provided with a second opening, and the interposer includes a second connection region corresponding to the second opening, the second connection region being connected to the electrode terminal.

15. The battery cell of claim 14, further comprising:

and the second insulating piece is arranged on the first surface and covers the second connecting area.

16. The battery cell as recited in claim 15, wherein the second insulator is connected to the first insulator.

17. The battery cell as recited in claim 15 wherein the second insulator fills the second opening.

18. The battery cell as recited in claim 15, wherein the electrode lead-out member includes a first attachment region for attachment to the tab, and the second and first insulating members completely cover an area of the first surface other than the first attachment region.

19. The battery cell as recited in claim 1, wherein the electrode lead-out member is an electrode terminal.

20. The battery cell as claimed in claim 1, wherein the tab is of a bent structure, and the battery cell further comprises a third insulating member disposed on an inner side of the bent tab.

21. The battery cell as recited in claim 20 wherein the third insulator extends to the body.

22. A battery comprising a cell according to any one of claims 1 to 21.

23. An electrical device comprising a battery cell according to any one of claims 1 to 21 for providing electrical energy.