CN115528313A - Battery cell, preparation method thereof, battery module, battery box and electric equipment - Google Patents

Battery cell, preparation method thereof, battery module, battery box and electric equipment Download PDF

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Publication number
CN115528313A
CN115528313A CN202211153440.1A CN202211153440A CN115528313A CN 115528313 A CN115528313 A CN 115528313A CN 202211153440 A CN202211153440 A CN 202211153440A CN 115528313 A CN115528313 A CN 115528313A
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CN
China
Prior art keywords
positive
out area
negative
negative electrode
positive electrode
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Pending
Application number
CN202211153440.1A
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Chinese (zh)
Inventor
王国
孙明星
段军卫
段亚辉
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China Aviation Lithium Battery Co Ltd
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China Aviation Lithium Battery Co Ltd
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Application filed by China Aviation Lithium Battery Co Ltd filed Critical China Aviation Lithium Battery Co Ltd
Priority to CN202211153440.1A priority Critical patent/CN115528313A/en
Publication of CN115528313A publication Critical patent/CN115528313A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/54—Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

The application relates to the technical field of batteries, in particular to a battery cell, a preparation method of the battery cell, a battery module, a battery box and electric equipment. The battery cell comprises positive plates and negative plates which are stacked and alternately arranged, and a diaphragm or a solid electrolyte layer is arranged between any positive plate and the negative plate adjacent to the positive plate; the positive plate is provided with a positive electrode leading-out area and a first hollowed-out area which are arranged at intervals, at least one side surface of the positive electrode leading-out area is provided with a positive electrode leading-out part, the negative plate is provided with a negative electrode leading-out area and a second hollowed-out area which are arranged at intervals, and at least one side surface of the negative electrode leading-out area is provided with a negative electrode leading-out part; the diaphragm or the solid electrolyte layer is provided with a third hollow area corresponding to the anode leading-out part, and the diaphragm or the solid electrolyte layer is provided with a fourth hollow area corresponding to the cathode leading-out part; each positive electrode lead-out part penetrates through each second hollow-out area and each third hollow-out area so as to enable the positive electrode lead-out parts to be electrically connected with each other, and each negative electrode lead-out part penetrates through each first hollow-out area and each fourth hollow-out area so as to enable the negative electrode lead-out parts to be electrically connected with each other.

Description

Battery cell, preparation method thereof, battery module, battery box and electric equipment
Technical Field
The application relates to the technical field of batteries, in particular to a battery cell, a preparation method of the battery cell, a battery module, a battery box and electric equipment.
Background
The tab is a core accessory with extremely high safety risk in the power battery and is an important component for welding an internal structure and an external component of the battery core. Referring to fig. 1, a conventional tab is provided with an extension portion for connecting with an external component, and the extension portion extends from an edge of a battery cell to a top cover of a battery device to connect with an external device through the top cover. The space needs to be reserved for the extension part of the lug in the box body of the battery device, so that the loss of the battery device is about 8% -12% of the space utilization rate, and the lug of the existing structure needs to be subjected to die cutting to cut off the redundant part of the extension part, so that material waste is caused.
In addition, before the battery cell is installed in the shell, the extending portion of the tab needs to be bent, however, the existing scheme cannot ensure that the bending direction of all tabs is controlled, the bending direction of part tabs is random, and the tabs may be reversely inserted into the battery cell, so that the positions of the tabs are easy to change in the actual use process, and further the risk of thermal runaway caused by contact short circuit between the tabs and the tabs is caused.
Disclosure of Invention
The application discloses a battery cell, a preparation method of the battery cell, a battery module, a battery box and electric equipment, which are used for solving the problems that space and material waste and a high thermal runaway risk exist when the conventional tab is applied to a battery device.
In order to achieve the purpose, the application provides the following technical scheme:
a first aspect provides an electric core, which comprises positive plates and negative plates which are stacked and alternately arranged, wherein a diaphragm or a solid electrolyte layer is arranged between any positive plate and the negative plate adjacent to the positive plate; the positive plate is provided with a positive electrode leading-out area and a first hollow-out area which are arranged at intervals, at least one side surface of the positive electrode leading-out area is provided with a positive electrode leading-out part, the negative plate is provided with a negative electrode leading-out area and a second hollow-out area which are arranged at intervals, and at least one side surface of the negative electrode leading-out area is provided with a negative electrode leading-out part; the diaphragm or the solid electrolyte layer is provided with a third hollow area corresponding to the anode leading-out part, and the diaphragm or the solid electrolyte layer is provided with a fourth hollow area corresponding to the cathode leading-out part; each positive electrode leading-out part penetrates through each second hollow-out area and each third hollow-out area so as to enable the positive electrode leading-out parts to be electrically connected with each other, and each negative electrode leading-out part penetrates through each first hollow-out area and each fourth hollow-out area so as to enable the negative electrode leading-out parts to be electrically connected with each other.
In the electrical core provided by the first aspect, when the positive plates, the negative plates, and the diaphragm or the solid electrolyte layer form the electrical core, each positive electrode lead-out portion penetrates through each second hollow-out area and each third hollow-out area to realize mutual electrical connection between the positive plates, each negative electrode lead-out portion penetrates through each first hollow-out area and each fourth hollow-out area to realize mutual electrical connection between the negative plates, and the diaphragm or the solid electrolyte layer can keep insulation between the positive plates and the negative plates.
The battery core in the first aspect replaces the lug of the existing structure through the positive electrode lead-out part and the negative electrode lead-out part, the design of the extension part is avoided, the space utilization rate in the battery device is effectively improved, the volume density can be improved by 8-12%, and the problem of thermal runaway caused by the fact that the lug is inserted into the battery core reversely is completely avoided due to the design without the lug; in addition, the cross cutting process has been avoided to the electric core of this application, can improve the utilization ratio of raw and other materials, reduces the loss of raw and other materials.
Furthermore, the positive plate comprises a positive current collector and a positive coating coated on at least one side surface of the positive current collector, and the first hollow area is an opening penetrating through the positive current collector and the positive coating, so that the negative leading-out parts penetrate through the first hollow area to realize mutual electrical connection; the positive electrode lead-out part is directly connected with the positive electrode current collector of the positive electrode lead-out area, so that good conductivity is kept between the positive electrode lead-out part and the positive electrode current collector.
Furthermore, the negative plate comprises a negative current collector and a negative coating coated on at least one side surface of the negative current collector, and the second hollow area is an opening penetrating through the negative current collector and the negative coating, so that each positive lead-out part penetrates through the second hollow area to realize mutual electrical connection; the negative electrode lead-out part is directly connected with the negative electrode current collector of the negative electrode lead-out area, so that good conductivity is kept between the negative electrode lead-out part and the negative electrode current collector.
Further, the positive electrode lead-out portion is located at an edge portion of the positive electrode sheet, and the negative electrode lead-out portion is located at an edge portion of the negative electrode sheet. Both are arranged on the edge part for convenient processing and assembly.
Furthermore, the positive electrode lead-out part and the negative electrode lead-out part are both metal lead-out parts, so that the conductive electrode has good conductivity and weldability.
Furthermore, the orthographic projection of the third hollow-out area on the positive plate is located in the positive electrode leading-out area, and the orthographic projection of the fourth hollow-out area on the negative plate is located in the negative electrode leading-out area, so that the insulation between the adjacent positive plate and the adjacent negative plate is kept.
Furthermore, the battery cell further comprises a battery cell shell used for packaging the positive plate and the negative plate, the battery cell shell is provided with a first connecting portion and a second connecting portion, the positive leading-out portion is electrically connected with the first connecting portion, and the negative leading-out portion is electrically connected with the second connecting portion. The first connection portion and the second connection portion may improve the firmness of the connection.
Furthermore, the first connecting portion is a first metal block, the second connecting portion is a second metal block, and the first metal block and the second metal block are arranged in an insulating mode, so that short circuit of the battery is avoided.
A second aspect provides a method for preparing the battery cell of the first aspect, which includes the following steps:
preparing a positive pole piece provided with a positive electrode leading-out area and a first hollow area;
preparing a negative pole piece provided with a negative pole leading-out area and a second hollow area;
preparing a diaphragm provided with a third hollow area and a fourth hollow area or preparing a solid electrolyte layer provided with the third hollow area and the fourth hollow area;
and assembling the positive plate, the negative plate and the diaphragm or assembling the positive plate, the negative plate and the solid electrolyte layer to obtain the battery core.
The battery cell prepared by the preparation method of the second aspect avoids the tabs, has the same advantages as the battery cell of the first aspect, and is not repeated here.
Further, the preparation of the positive pole piece provided with the positive pole leading-out area and the first hollow area comprises the following steps:
coating a positive electrode coating on a positive electrode current collector, and cleaning the positive electrode coating in a preset area by laser to obtain a positive electrode lead-out area;
the preparation of the negative pole piece provided with the negative pole leading-out area and the second hollow-out area comprises the following steps:
and coating a negative electrode coating on the negative electrode current collector, and cleaning the negative electrode coating in the preset area by laser to obtain a negative electrode lead-out area.
The method for cleaning the preset area by laser to obtain the anode leading-out area and the cathode leading-out area is simple and convenient to operate, and the working efficiency is improved.
The third aspect provides a battery module, which includes the battery cell of the first aspect or the battery cell prepared by the preparation method of the second aspect. The battery module's of this application electric core has evaded utmost point ear, has improved raw and other materials and battery device's space utilization, has avoided utmost point ear reverse insertion electric core to arouse the problem of thermal runaway.
A fourth aspect provides a battery box including the battery module of the third aspect and a battery box body for housing the battery module. The battery box in this application has the same advantage with the battery module of third aspect, and the repeated description is omitted here.
A fifth aspect provides a powered device comprising the battery box of the fourth aspect. The electric equipment of the present application has the same advantages as the battery box of the fourth aspect, and is not described herein again.
Drawings
Fig. 1 is a schematic structural diagram of a tab of a conventional battery cell;
fig. 2 is an exploded view of a battery cell according to an embodiment of the present application;
fig. 3 is a front view of a positive electrode tab according to an embodiment of the present application;
fig. 4 is a front view of a negative electrode sheet according to an embodiment of the present application;
FIG. 5 is a front view of a septum according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a positive electrode sheet according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of a negative electrode sheet according to an embodiment of the present application;
fig. 8 is a front view of a cell according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of a battery cell according to an embodiment of the present application;
fig. 10 is an exploded view of a cell casing according to an embodiment of the present application;
fig. 11 is a flow chart illustrating a process of manufacturing and assembling a cell according to an embodiment of the present disclosure;
fig. 12 is a flow chart of manufacturing and assembling a battery cell of a conventional structure.
Reference numerals: 10-electric core; 20-a cell casing; 21-side plate; 22-a cover plate; 23-a base plate;
110-positive plate; 111-positive current collector; 112-positive electrode coating; 120-positive lead-out; 130-negative plate; 131-a negative current collector; 132-a negative electrode coating; 140-negative electrode lead-out part; 150-a separator;
01-positive lead-out region; 02-a first hollowed-out area; 03-a negative lead-out region; 04-a second hollowed-out area; 05-a third hollowed-out area; 06-a fourth hollowed-out area; 07-a first connection; 08-a second connection;
001-extension.
Detailed Description
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 only a part of the embodiments of the present application, and not all of the 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.
The tab is a core accessory with extremely high safety risk in the power battery and is an important component for welding an internal structure and an external element of the battery core. Referring to fig. 1, the conventional tab is provided with a protruding portion 001 for connecting with an external device, and the protruding portion 001 extends from the edge of the battery cell to a top cover of the battery device to connect with an external device through the top cover. Need in the box of battery device for the extension portion headspace of utmost point ear, lead to the space utilization about 8% -12% of battery device loss, the utmost point ear of current structure need carry out the cross cutting in order to cut away the unnecessary part of extension portion moreover, cause the material extravagant, in addition, electric core extension 001 is in the casing back easily anti-insert electric core of packing into and lead to thermal runaway.
In view of the above, a battery cell is provided in an embodiment of the present application, fig. 2 is an exploded view of the battery cell of an embodiment of the present application, and referring to fig. 2, the battery cell 10 includes positive electrode sheets 110 and negative electrode sheets 130 stacked and alternately arranged, and a separator 150 or a solid electrolyte layer is disposed between any positive electrode sheet 110 and the negative electrode sheet 130 adjacent to the positive electrode sheet.
Among them, the separator or the solid electrolyte layer is classified according to the type of the battery, and the batteries currently on the market are roughly classified into a liquid battery and a solid battery according to the state of the electrolyte. The battery core of the liquid battery comprises a positive plate, a negative plate and a diaphragm, wherein the diaphragm is positioned between the positive plate and the negative plate; the battery core of the solid-state battery comprises a positive plate, a negative plate and a solid electrolyte layer, wherein the solid electrolyte layer is positioned between the positive plate and the negative plate.
Fig. 3 is a front view of a positive electrode sheet according to an embodiment of the present invention, fig. 4 is a front view of a negative electrode sheet according to an embodiment of the present invention, fig. 5 is a front view of a separator according to an embodiment of the present invention, and fig. 3 to 5 are also included, the positive electrode sheet 110 is provided with a positive electrode lead-out region 01 and a first hollow-out region 02 which are arranged at intervals, at least one side surface of the positive electrode lead-out region 01 is provided with a positive electrode lead-out portion 120, the negative electrode sheet 130 is provided with a negative electrode lead-out region 03 and a second hollow-out region 04 which are arranged at intervals, and at least one side surface of the negative electrode lead-out region 03 is provided with a negative electrode lead-out portion 140; the diaphragm 150 is provided with a third hollow area 05 corresponding to the positive electrode lead-out portion 120, and the diaphragm 150 is provided with a fourth hollow area 06 corresponding to the negative electrode lead-out portion 140. The shapes of the positive electrode lead-out area 01, the negative electrode lead-out area 03, the first hollow-out area 02, the second hollow-out area 04, the third hollow-out area 05 and the fourth hollow-out area 06 are not limited, and may be rectangular, circular or other shapes.
The protection scope of the present application is that the positive electrode lead-out portion 120 is disposed on one side surface of the positive electrode lead-out region 01, or the positive electrode lead-out portions 120 are disposed on both side surfaces thereof. Preferably, the positive electrode lead-out regions 01 are provided at both side surfaces thereof with positive electrode lead-out portions 120 to facilitate electrical connection between the respective positive electrode sheets 110.
Similarly, it is within the scope of the present application that one side surface of the negative lead-out region 03 is provided with the negative lead-out portion 140, or both side surfaces thereof are provided with the negative lead-out portions 140. Preferably, the negative electrode lead-out regions 03 are provided at both side surfaces thereof with negative electrode lead-out portions 140 to facilitate electrical connection between the respective negative electrode sheets 130.
It is understood that, for the cell 10 of the solid-state battery, the solid electrolyte layer is provided with the third hollow-out region 05 corresponding to the positive electrode lead-out portion 120, and the fourth hollow-out region 06 corresponding to the negative electrode lead-out portion 140.
Fig. 6 is a schematic structural diagram of a positive electrode sheet according to an embodiment of the present application, and referring to fig. 6, the positive electrode sheet 110 includes a positive electrode current collector 111 and a positive electrode coating 112 coated on at least one side surface of the positive electrode current collector 111, the first hollow-out area 02 is an opening penetrating through the positive electrode current collector 111 and the positive electrode coating 112, and the positive electrode lead-out portion 120 is directly connected to the positive electrode current collector 111 in the positive electrode lead-out area 01. The positive electrode current collector 111 may have a positive electrode coating 112 on one surface thereof, or have positive electrode coatings 112 on both surfaces thereof. Preferably, both side surfaces of the positive electrode collector 111 are provided with the positive electrode coating layer 112.
Fig. 7 is a schematic structural diagram of a negative electrode sheet according to an embodiment of the present application, referring to fig. 7, the negative electrode sheet 130 includes a negative electrode current collector 131 and a negative electrode coating 132 coated on at least one side surface of the negative electrode current collector 131, the second hollow-out area 04 is an opening penetrating through the negative electrode current collector 131 and the negative electrode coating 132, and the negative electrode lead-out portion 140 is directly connected to the negative electrode current collector 131 of the negative electrode lead-out area 03. The negative electrode current collector 131 may have a negative electrode coating 132 on one surface thereof, or both surfaces thereof have the negative electrode coating 132. Preferably, both side surfaces of the negative electrode current collector 131 are provided with the negative electrode coating 132.
The positive electrode lead-out part 120 is located at an edge portion of the positive electrode sheet 110, and the negative electrode lead-out part 140 is located at an edge portion of the negative electrode sheet 130, both of which are provided at the edge portions for convenience of processing and assembly.
In an alternative of the present embodiment, the positive electrode lead-out portion 120 and the negative electrode lead-out portion 140 are both metal lead-out portions. The positive electrode lead-out portion 120 and the negative electrode lead-out portion 140 may be made of aluminum, copper, nickel, or an alloy of the above metals, because the above materials have good conductivity and weldability, which facilitates the welding connection between the adjacent positive electrode tabs 110 through the positive electrode lead-out portion 120, or between the adjacent negative electrode tabs 130 through the negative electrode lead-out portion 140.
The shape of the cathode lead-out portion 120 is preferably the same as the shape of the cathode lead-out region 01, and the area of the cathode lead-out portion 120 is preferably smaller than the area of the cathode lead-out region 01. The shape of the negative electrode lead-out portion 140 is preferably the same as the shape of the negative electrode lead-out region 03, and the area of the negative electrode lead-out portion 140 is smaller than the area of the negative electrode lead-out region 03.
In an alternative of this embodiment, an orthographic projection of the third hollow-out region 05 on the positive electrode sheet 110 is located in the positive electrode lead-out region 01, that is, only the positive electrode lead-out portion 120 passes through the third hollow-out region 05, and at the same time, the separator 150 or the solid electrolyte layer may maintain insulation between the adjacent positive electrode sheet 110 and the adjacent negative electrode sheet 130; the orthographic projection of the fourth hollow-out area 06 on the negative electrode sheet 130 is located in the negative electrode lead-out area 03, that is, only the negative electrode lead-out part 140 passes through the fourth hollow-out area 06, and at the same time, the diaphragm 150 or the solid electrolyte layer can maintain the insulation between the adjacent positive electrode sheet 110 and the negative electrode sheet 130.
Fig. 8 is a front view of a battery cell according to an embodiment of the present disclosure, fig. 9 is a schematic structural diagram of the battery cell according to the embodiment of the present disclosure, and referring to fig. 8 and fig. 9, each positive electrode lead-out portion 120 penetrates through each second hollow-out region 04 and each third hollow-out region 05 to electrically connect the positive electrode lead-out portions 120 to each other, and each negative electrode lead-out portion 140 penetrates through each first hollow-out region 02 and each fourth hollow-out region 06 to electrically connect the negative electrode lead-out portions 140 to each other.
The adjacent positive electrode lead-out portions 120 may be connected by bolts after drilling and tapping, or may be directly welded by using a welding wire, and the connection mode of each positive electrode lead-out portion 120 is not limited in this application. Preferably, the positive electrode lead-out portions 120 are connected to each other by ultrasonic welding.
Fig. 10 is an exploded view of a battery cell casing according to an embodiment of the present application, where the battery cell 10 further includes a battery cell casing 20 for encapsulating the positive electrode sheet 110 and the negative electrode sheet 130, and the positive electrode lead-out portion 120 and the negative electrode lead-out portion 140 are electrically connected to the battery cell casing 20, and are further connected to an external component through the battery cell casing 20, so as to supply power to the external component.
Wherein, electric core casing 20 includes bottom plate 23, curb plate 21 and the apron 22 of setting up relatively with bottom plate 23, and bottom plate 23 and the curb plate 21 that encloses along bottom plate 23 and establish form the cavity, and the positive plate 110 that the range upon range of setting and the naked electric core of negative pole piece 130 constitution are located in the cavity, and apron 22 lid closes in the cavity top in order to encapsulate naked electric core.
With continued reference to fig. 10, the inner wall of the cell casing 20 is provided with a first connection portion 07 and a second connection portion 08, the first connection portion 07 is electrically connected to the positive electrode lead-out portion 120, and the second connection portion 08 is electrically connected to the negative electrode lead-out portion 140. The first connection portion 07 and the second connection portion 08 may be provided on the cover plate 22, the bottom plate 23, or the side plate 21 of the cell casing 20. The first connection portion 07 and the second connection portion 08 may be disposed on opposite inner walls or on the same inner wall, for example, the first connection portion 07 and the second connection portion 08 are both disposed on the cover plate 22, or the first connection portion 07 is disposed on the cover plate 22 and the second connection portion 08 is disposed on the bottom plate 23. The arrangement positions of the first connecting portion 07 and the second connecting portion 08 are not limited in the present application, and are specifically designed according to conditions in actual production.
The apron of the electric core casing of current structure is equipped with anodal utmost point post and negative pole utmost point post, and the anodal utmost point ear and the anodal utmost point post of naked electric core are connected, and the negative pole utmost point ear is connected with the negative pole utmost point post respectively. For the battery core with the existing structure, the design of the cover plate 22 of the battery core in the embodiment of the present application is more flexible, the cover plate 22 may be simultaneously provided with the first connecting portion 07 and the second connecting portion 08, or only one of the first connecting portion and the second connecting portion may be provided, and the other one is provided on the bottom plate 23, or both the first connecting portion 07 and the second connecting portion 08 are not provided on the cover plate 22.
The first connection portion 07 is a first metal block, the second connection portion 08 is a second metal block, and the first metal block and the second metal block are arranged in an insulating manner to prevent the battery from being short-circuited due to connection between the positive plate 110 and the negative plate 130.
The first connection portion 07 is used to improve the connection firmness between the positive electrode lead-out portion 120 and the cell casing 20, and protect the cell casing 20 from being damaged by welding or other connection methods. The second connection portion 08 is used to improve the firmness of the connection between the negative lead-out portion 140 and the cell casing 20, and protect the cell casing 20 from being damaged by the connection manner such as welding.
An embodiment of the present application further provides a method for manufacturing a battery cell, fig. 11 is a flowchart illustrating a manufacturing and assembling process of the battery cell according to an embodiment of the present application, and referring to fig. 11, the method for manufacturing a battery cell according to the present application includes the following steps:
preparing a positive pole piece provided with a positive electrode leading-out area and a first hollow area;
preparing a negative pole piece provided with a negative pole leading-out area and a second hollow area;
preparing a diaphragm provided with a third hollow area and a fourth hollow area or preparing a solid electrolyte layer provided with the third hollow area and the fourth hollow area;
assembling the positive plate, the negative plate and the diaphragm or assembling the positive plate, the negative plate and the solid electrolyte layer to obtain a bare cell;
the positive pole extraction portion of naked electric core is connected with the first connecting portion of electric core casing, and the negative pole extraction portion of naked electric core is connected with the second connecting portion of electric core casing, and naked electric core is accomplished in order to obtain electric core with the assembly of electric core casing.
The preparation method comprises the following steps of:
coating a positive electrode coating on a positive electrode current collector, and cleaning the positive electrode coating in a preset area by laser to obtain a positive electrode lead-out area;
the preparation of the negative pole piece provided with the negative pole leading-out area and the second hollow area comprises the following steps:
and coating a negative electrode coating on the negative electrode current collector, and cleaning the negative electrode coating in the preset area by laser to obtain a negative electrode lead-out area.
In the positive electrode lead-out region and the negative electrode lead-out region, corresponding regions may be directly reserved in the coating step.
It can be understood that the positive electrode coating may be coated after the first hollow-out area is cut on the positive electrode current collector, or the positive electrode coating may be coated on the positive electrode current collector and then the predetermined area is cut to obtain the first hollow-out area.
The description of the above preparation process is equally applicable to the negative electrode sheet.
In order to further explain the beneficial effects of the preparation method of the battery cell in the application, a preparation procedure of the battery cell with the existing structure is explained. Fig. 12 is a flow chart illustrating a manufacturing and assembling process of a battery cell with a conventional structure, and referring to fig. 12, a manufacturing method of the battery cell with the conventional structure includes the following steps:
1) Coating a positive electrode coating on a positive electrode current collector to obtain a positive electrode roll, and coating a negative electrode coating on a negative electrode current collector to obtain a negative electrode roll;
2) After rolling, die cutting is carried out on the positive electrode coil to obtain a positive electrode tab, and after rolling, die cutting is carried out on the negative electrode coil to obtain a negative electrode tab;
3) Die-cutting the positive electrode coil to obtain a positive electrode plate, and die-cutting the negative electrode coil to obtain a negative electrode plate;
4) Laminating the positive plate, the negative plate and the diaphragm or the positive plate, the negative plate and the solid electrolyte layer to obtain a bare cell;
5) The positive tab and the negative tab of the naked battery cell are connected with the cover plate of the battery cell shell, and the battery cell is assembled in the battery cell shell to obtain the battery cell.
Compared with the preparation process of the battery cell with the existing structure, the battery cell prepared by the preparation method of the battery cell in the embodiment of the application cancels the design of the tab, each positive electrode lead-out part penetrates through each second hollow-out area and each third hollow-out area to be electrically connected with each other, and each negative electrode lead-out part penetrates through each first hollow-out area and each fourth hollow-out area to be electrically connected with each other. The battery cell in various possible embodiments of the present application and the battery cell prepared by the preparation method in the embodiments of the present application have the following beneficial effects:
1. the design of the lug is avoided, so that the bending and shaping process of the lug does not exist in the assembled battery cell, and the problem of thermal runaway caused by the reverse insertion of the lug is completely avoided;
2. the battery cell has no extension part of a tab with the existing structure, so that the space utilization rate is effectively improved, and the volume density is improved by 8-12%;
3. the preparation method reduces the die cutting procedure, can improve the utilization rate of the copper aluminum foil, and reduces the loss of the copper aluminum foil;
4. the position of the connection between the battery cell shell and the positive electrode leading-out part or the negative electrode leading-out part can be adjusted as required, so that the traditional cover plate design can be changed, and the design mode of the existing battery cell shell is more flexible.
Based on the same inventive concept, the embodiment of the application further provides a battery module, and the battery module comprises the battery cell or the battery cell prepared by the preparation method of the embodiment of the application.
The embodiment of this application still provides a battery box, and this battery box includes foretell battery module and is used for encapsulating the battery box of battery module.
The embodiment of the application also provides electric equipment, and the electric equipment comprises the battery box. Specifically, in this embodiment, the electric device may be specifically an electric vehicle or the like.
It will be apparent to those skilled in the art that various changes and modifications can be made in the embodiments of the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims (13)

1. The battery cell is characterized by comprising a positive plate and a negative plate which are stacked and alternately arranged, wherein a diaphragm or a solid electrolyte layer is arranged between any positive plate and the negative plate adjacent to the positive plate;
the cathode plate is provided with a cathode leading-out area and a first hollowed-out area which are arranged at intervals, at least one side surface of the cathode leading-out area is provided with a cathode leading-out part, the cathode plate is provided with a cathode leading-out area and a second hollowed-out area which are arranged at intervals, and at least one side surface of the cathode leading-out area is provided with a cathode leading-out part;
the diaphragm or the solid electrolyte layer is provided with a third hollowed-out area corresponding to the anode leading-out part, and the diaphragm or the solid electrolyte layer is provided with a fourth hollowed-out area corresponding to the cathode leading-out part;
each positive electrode leading-out part penetrates through each second hollow-out area and each third hollow-out area so as to enable the positive electrode leading-out parts to be electrically connected with each other, and each negative electrode leading-out part penetrates through each first hollow-out area and each fourth hollow-out area so as to enable the negative electrode leading-out parts to be electrically connected with each other.
2. The battery cell of claim 1, wherein the positive plate includes a positive current collector and a positive coating coated on at least one side surface of the positive current collector, the first hollow-out area is an opening penetrating through the positive current collector and the positive coating, and the positive lead-out portion is directly connected to the positive current collector in the positive lead-out area.
3. The battery cell of claim 2, wherein the negative electrode tab includes a negative electrode current collector and a negative electrode coating applied to at least one side surface of the negative electrode current collector, the second hollow-out region is an opening penetrating through the negative electrode current collector and the negative electrode coating, and the negative electrode lead-out portion is directly connected to the negative electrode current collector of the negative electrode lead-out region.
4. The battery cell of any one of claims 1 to 3, wherein the positive lead-out portion is located at an edge of the positive plate, and the negative lead-out portion is located at an edge of the negative plate.
5. The electrical core of claim 4, wherein the positive lead-out portion and the negative lead-out portion are both metal lead-out portions.
6. The battery cell of claim 4, wherein an orthographic projection of the third hollow-out region on the positive electrode sheet is located at the positive electrode lead-out region; and the orthographic projection of the fourth hollow-out area on the negative plate is positioned in the negative lead-out area.
7. The battery cell of any of claims 1 to 6, further comprising a cell casing for enclosing the positive electrode tab and the negative electrode tab, wherein the cell casing is provided with a first connection portion and a second connection portion, the positive electrode lead-out portion is electrically connected to the first connection portion, and the negative electrode lead-out portion is electrically connected to the second connection portion.
8. The battery core according to claim 7, wherein the first connecting portion is a first metal block, the second connecting portion is a second metal block, and the first metal block and the second metal block are insulated from each other.
9. A method for preparing a cell according to any of claims 1 to 8, comprising the following steps:
preparing the positive pole piece provided with the positive electrode leading-out area and the first hollowed-out area;
preparing the negative pole piece provided with the negative pole leading-out area and the second hollowed-out area;
preparing the diaphragm provided with the third hollowed-out area and the fourth hollowed-out area or preparing the solid electrolyte layer provided with the third hollowed-out area and the fourth hollowed-out area;
and assembling the positive plate, the negative plate and the diaphragm or assembling the positive plate, the negative plate and the solid electrolyte layer to obtain the battery core.
10. The manufacturing method according to claim 9, wherein the manufacturing of the positive electrode sheet provided with the positive electrode lead-out region and the first hollowed-out region includes the steps of:
coating a positive electrode coating on a positive electrode current collector, and cleaning the positive electrode coating in a preset area by laser to obtain a positive electrode lead-out area;
the preparation of the negative pole piece provided with the negative pole leading-out area and the second hollowed-out area comprises the following steps:
and coating a negative electrode coating on the negative electrode current collector, and cleaning the negative electrode coating in a preset area by laser to obtain the negative electrode lead-out area.
11. A battery module, characterized by comprising the battery cell of any one of claims 1 to 8 or the battery cell prepared by the preparation method of claim 9 or 10.
12. A battery case comprising the battery module according to claim 11 and a battery case body for housing the battery module.
13. An electric device characterized by comprising the battery box according to claim 12.
CN202211153440.1A 2022-09-21 2022-09-21 Battery cell, preparation method thereof, battery module, battery box and electric equipment Pending CN115528313A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211153440.1A CN115528313A (en) 2022-09-21 2022-09-21 Battery cell, preparation method thereof, battery module, battery box and electric equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211153440.1A CN115528313A (en) 2022-09-21 2022-09-21 Battery cell, preparation method thereof, battery module, battery box and electric equipment

Publications (1)

Publication Number Publication Date
CN115528313A true CN115528313A (en) 2022-12-27

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Country Status (1)

Country Link
CN (1) CN115528313A (en)

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