CN112447938A - Cell structure of laminated lithium battery and manufacturing method thereof - Google Patents
Cell structure of laminated lithium battery and manufacturing method thereof Download PDFInfo
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- CN112447938A CN112447938A CN202011414199.4A CN202011414199A CN112447938A CN 112447938 A CN112447938 A CN 112447938A CN 202011414199 A CN202011414199 A CN 202011414199A CN 112447938 A CN112447938 A CN 112447938A
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- positive plate
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
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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
- H01M10/052—Li-accumulators
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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
- H01M10/0583—Construction or manufacture of accumulators with folded construction elements except wound ones, i.e. folded positive or negative electrodes or separators, e.g. with "Z"-shaped electrodes or separators
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- 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
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention relates to a cell structure of a laminated lithium battery and a manufacturing method thereof, and introduces a positive plate structure of a cell, a structure of the cell and a manufacturing structure of the cell; the upper end and the lower end of the positive/negative pole piece are respectively provided with a white area, an appropriate amount of insulating paint can be sprayed in the white areas, and the white areas can prevent the positive/negative pole piece from being short-circuited due to the fact that a sharp corner pierces a diaphragm when the positive/negative pole piece is laminated with the diaphragm or is dried subsequently; the manufacturing method of the cell structure can change the original step of chamfering and punching by a die-cutting machine, thereby reducing the effect of the die. The structure is more beneficial to standardized production operation.
Description
Technical Field
The invention relates to a lithium battery structure, in particular to a cell structure of a laminated lithium battery and a manufacturing method thereof.
Background
The lamination process is one of the current lithium battery production processes, a die-cutting machine is used for punching and cutting coiled positive and negative pole rolls into pole pieces according to fixed length, the middle part of the punched pole piece is in an arch shape due to the diameter of the roll, 4 sharp corners of the pole piece have the risk of puncturing a diaphragm, and particularly after a battery core is baked, the short circuit rate tends to rise.
The high-speed die cutting machine for producing the lithium battery pole pieces at present adopts a high-speed die to punch round corners and oblique angles to reduce the occurrence of short circuit in order to reduce the probability of short circuit caused by that sharp corners at the top and the bottom of positive and negative pole pieces pierce through a diaphragm during lamination. In the traditional pole piece design, the top of the pole piece is usually provided with an insulating coating which can protect the membrane from being punctured by the top of the pole piece; because the sharp corners of the top and bottom material areas of the positive plate still exist due to the punching size error, the problem of short circuit of the laminated battery cell cannot be thoroughly solved.
Disclosure of Invention
The invention aims to provide a core structure of a laminated lithium battery and a manufacturing method thereof, which solve the problem that sharp corners of pole pieces stab membranes during lamination or subsequent processing, thereby causing short circuit risks.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention provides a positive plate structure of a lithium battery cell, which comprises a positive plate body, wherein the positive plate body comprises a positive material area and a blank area, the blank area is arranged at the end part of the positive material area, positive active materials are coated on the positive material area, and the positive plate body further comprises a tab, and the tab is communicated with the positive material area.
Preferably, the blank regions include a first blank region and a second blank region, the first blank region and the second blank region are respectively disposed at two ends of the positive electrode material region, and the tab is disposed in the second blank region.
Further, the width of the tab is not greater than the width of the positive plate body.
The utility model provides an electricity core structure of lamination formula lithium cell, includes positive plate, negative pole piece and diaphragm, wherein, positive plate is any one of claims 1-3 positive plate structure, negative pole piece includes negative pole piece body, negative pole piece body includes negative pole material district, the coating has negative pole active material on the negative pole material district, the one end in negative pole material district is connected with utmost point ear, the diaphragm set up positive plate with between the negative pole piece, the diaphragm positive plate with the negative pole piece overlaps each other.
A method of manufacturing a cell of a laminated lithium battery, wherein the method comprises:
preparing a positive plate body, spraying a positive active material in the middle of the positive plate body, arranging blank areas at two ends of the positive plate body, and punching an electrode lug position in the blank area at one end by using a sheet making machine;
preparing a negative plate body, spraying a negative active material in the middle of the negative plate body, arranging blank areas at two ends of the negative plate body, and punching a pole lug position in the blank area at one end by using a sheet making machine;
laminating, namely sequentially overlapping the positive plate body, the diaphragm and the negative plate body in a Z shape to enable the electrode ear positions of the positive plate and the negative plate to respectively correspond, wherein the number of the overlapped layers is determined according to the required capacity of the battery core;
adding a diaphragm, and adding a layer of diaphragm at each of two ends after the overlapping is finished;
and carrying out subsequent operation on the overlapped positive electrode sheet body, the diaphragm and the negative electrode sheet body to form a complete battery cell structure.
Further, an insulating paint may be sprayed in the margin region.
Further, the length of the white space area at the other end is 0.5-2 mm.
Further, after the overlapping is finished, the distance from the tail part of the positive electrode sheet body to the end part of the diaphragm is 3 +/-0.5 mm, and the distance from the tail part of the negative electrode sheet body to the end part of the diaphragm is 3 +/-0.5 mm.
Further, after the overlapping is finished, the distance from the side edge of the positive electrode sheet body to the end part of the diaphragm is 1.75 +/-0.3 mm, and the distance from the side edge of the negative electrode sheet body to the end part of the diaphragm is 0.75 +/-0.3 mm.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
the invention provides a core structure of a laminated lithium battery and a manufacturing method thereof, which is different from the structure of a pole piece of a traditional core. The structure is more beneficial to standardized production operation.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
FIGS. 1 and 2 are schematic views of two different positive electrode sheets;
fig. 3 is a schematic structural diagram of the positive and negative pole piece lamination.
Wherein the reference numerals are as follows:
11. a pole lug position 12, a positive pole material area 13, a first blank area 14 and a second blank area;
21. positive electrode sheet, 22, negative electrode sheet, 23, and separator.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
A positive plate structure of a lithium battery cell;
example 1: referring to fig. 2, including the positive plate body, the centre of positive plate body is provided with anodal material district 12, the both sides in anodal material district 12 all scribble anodal active material, the tip in anodal material district is provided with leaves white the district, it includes first leaves white district 13 and second and leaves white district 14 to leave white the district, first leaves white district 13 and second and leaves white district 14 and connect respectively at the both ends in anodal material district 12, the width that first leaves white district 13 and second left white district 14 equals with positive plate body width, can be provided with utmost point ear position 11 in the second leaves white district 14, utmost point ear position 11 size is the same with the area that second left white district 14, utmost point ear sets up in utmost point ear position 11, at this moment, the area that second left white district 14 equals the area of utmost point ear.
Example 2: referring to fig. 1, the only difference from example 1 is that the area of the tab 11 is smaller than the area of the second margin region 14, and a certain margin region exists between the root of the tab 11 and the positive electrode material region 12, and the width of the tab may be smaller than or equal to the width of the positive electrode sheet body.
A core structure of a laminated lithium battery;
referring to fig. 3, including the positive plate 21, the negative plate 22 and the separator 23, the positive plate 21 uses the positive plate of any one of the above structures, when the required negative plate 22 is thick, the negative plate 22 uses the same structure as the positive plate, except that a negative material region is arranged in the middle of the negative plate 22, the negative material region is coated with a negative active material, the material of the tab may be different, or other aspects of presenting polarity may be different, and other structures are the same; when the required negative electrode sheet 22 is thick, the middle of the negative electrode body is coated with a negative electrode material, one end of the negative electrode body is connected with a tab, a blank area does not exist, and the situation that the diaphragm is punctured by the tab is avoided because the negative electrode sheet is thin. The diaphragm 23 is arranged between the positive plate 21 and the negative plate 22, the diaphragm 23, the positive plate 21 and the negative plate 22 are arranged in an overlapping manner, and subsequent operations are performed after the overlapping, so that a complete cell structure is formed.
A method for manufacturing a core of a laminated lithium battery; the required steps are as follows:
s1: preparing a positive plate, spraying a positive active material in the middle of the positive plate, reserving certain blank areas at two ends, wherein the areas of the blank areas at the two ends are different, punching a tab position in one blank area at one end by using a sheet making machine, and the area of the tab position can be the same as the area of the blank area at the other end.
S2: preparing the negative pole piece, the middle spraying of negative pole piece lamellar body has negative pole active material, and the both ends of negative pole piece lamellar body are provided with leaves the white region, use pelleter in one end leave the white regional die-cut utmost point ear position, the area of utmost point ear position can equal the one end of place leave the white regional area. The pole ear position can also be directly punched without setting a blank area.
S3: and (3) laminating, namely sequentially overlapping the positive plate, the diaphragm and the negative plate in a Z shape to enable the lugs of the positive/negative plates to respectively correspond, wherein the number of overlapped layers is determined according to the required capacity of the battery cell. And after the lamination is finished, a layer of diaphragm is respectively added on the upper side surface and the lower side surface.
S4: and carrying out subsequent operations on the overlapped positive plate, the diaphragm and the negative plate so as to form a complete cell structure.
In the area of leaving white, can the spraying certain insulating coating, generally choose the insulating coating that the material is softer after the stoving.
The length of the margin area at one end of the un-punched pole lug is 0.5-2 mm, and the length is suitable for subsequent processing and assembly.
After the overlapping is finished, the distance from the tail part of the positive plate to the end part of the diaphragm is 3 +/-0.5 mm, and the distance from the tail part of the negative plate to the end part of the diaphragm is 3 +/-0.5 mm.
The distance from the side edge of the positive electrode sheet body to the end part of the diaphragm is 1.75 +/-0.3 mm, and the distance from the side edge of the negative electrode sheet body to the end part of the diaphragm is 0.75 +/-0.3 mm. The positive plate is completely coated by the negative plate through the diaphragm. And a certain processing position is reserved.
When the battery is used specifically, the positive and negative pole pieces are produced by the process, the short-circuit rate of the sharp corners at the top and the bottom piercing through the diaphragm is zero, and the safety of the battery core is improved.
The above embodiments are merely illustrative of the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the content of the present invention and implement the invention, and not to limit the scope of the invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the scope of the present invention.
Claims (9)
1. The utility model provides a positive plate structure of lithium cell electricity core, its characterized in that, includes the positive plate body, including anodal material district and blank district on the positive plate body, blank district sets up the tip in anodal material district, the coating has anodal active material in anodal material district, the positive plate body is still including anodal ear position, anodal ear position with anodal material district is linked together.
2. The positive plate structure of the lithium battery cell of claim 1, characterized in that: leave white district and include that first white district and second leave white district, first leave white district with the second leaves white district and sets up respectively the both ends in anodal material district, utmost point ear position sets up in the second leaves white district.
3. The positive plate structure of the lithium battery cell of claim 2, characterized in that: the width of the pole ear position is not more than the width of the positive pole piece body.
4. The utility model provides an electricity core structure of lamination formula lithium cell, includes positive plate, negative pole piece and diaphragm, its characterized in that, positive plate is any one of claims 1-3 positive plate structure, negative pole piece includes the negative pole piece body, the negative pole piece body includes negative pole material district, the coating has negative pole active material in the negative pole material district, the one end in negative pole material district is connected with utmost point ear, separate the mould setting and be in positive plate with between the negative pole piece, the diaphragm positive plate with the negative pole piece overlaps each other.
5. A method of manufacturing a cell of a laminated lithium battery, the method comprising:
preparing a positive plate, spraying a positive active material in the middle of the positive plate, arranging blank areas at two ends of the positive plate, and punching an electrode lug in the blank area at one end by using a sheet making machine;
preparing a negative plate, spraying a negative active material in the middle of the negative plate, arranging blank areas at two ends of the negative plate, and punching a pole lug in the blank area at one end by using a sheet making machine;
laminating, namely sequentially overlapping the positive plate, the diaphragm and the negative plate in a Z shape to enable the pole ear positions of the positive plate and the negative plate to respectively correspond, wherein the number of overlapped layers is determined according to the required capacity of the battery core;
and carrying out subsequent operation on the overlapped positive plate, the diaphragm and the negative plate to form a complete cell structure.
6. The method of manufacturing a core of a laminated lithium battery as claimed in claim 5, wherein: and insulating paint can be sprayed in the white-left area.
7. The method of manufacturing a core of a laminated lithium battery as claimed in claim 5, wherein: the length of the white space area at the other end is 0.5-2 mm.
8. The method of manufacturing a core of a laminated lithium battery as claimed in claim 5, wherein: after the overlapping is finished, the distance between the tail part of the positive plate and the end part of the diaphragm is 2.5-3.5 mm, and the distance between the tail part of the negative plate and the end part of the diaphragm is 2.5-3.5 mm.
9. The method of manufacturing a core of a laminated lithium battery as claimed in claim 5, wherein: after the overlapping is finished, the distance between the side edge of the positive plate and the end part of the diaphragm is 1.45-2.05 mm, and the distance between the side edge of the negative plate and the end part of the diaphragm is 0.45-1.05 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011414199.4A CN112447938A (en) | 2020-12-07 | 2020-12-07 | Cell structure of laminated lithium battery and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011414199.4A CN112447938A (en) | 2020-12-07 | 2020-12-07 | Cell structure of laminated lithium battery and manufacturing method thereof |
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| Publication Number | Publication Date |
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| CN112447938A true CN112447938A (en) | 2021-03-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011414199.4A Pending CN112447938A (en) | 2020-12-07 | 2020-12-07 | Cell structure of laminated lithium battery and manufacturing method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114843519A (en) * | 2022-05-26 | 2022-08-02 | 东莞锂威能源科技有限公司 | Current collector, positive plate, negative plate, laminated battery cell, battery and preparation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201868525U (en) * | 2010-11-30 | 2011-06-15 | 珠海金峰航电源科技有限公司 | Lithium-ion battery |
| CN201927674U (en) * | 2010-12-09 | 2011-08-10 | 珠海金峰航电源科技有限公司 | Lithium-ion battery comprising anode pole piece provided with strip non-foil parts |
| CN105244470A (en) * | 2015-09-11 | 2016-01-13 | 合肥国轩高科动力能源有限公司 | High-safety lithium ion laminated battery positive plate and preparation method thereof |
| CN109065839A (en) * | 2018-07-13 | 2018-12-21 | 珠海格力电器股份有限公司 | Full-lug positive plate, winding battery cell and manufacturing method thereof |
| CN211980766U (en) * | 2020-06-01 | 2020-11-20 | 安徽省银瑞电池科技有限公司 | Prevent electric core structure of short circuit and have its battery |
-
2020
- 2020-12-07 CN CN202011414199.4A patent/CN112447938A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201868525U (en) * | 2010-11-30 | 2011-06-15 | 珠海金峰航电源科技有限公司 | Lithium-ion battery |
| CN201927674U (en) * | 2010-12-09 | 2011-08-10 | 珠海金峰航电源科技有限公司 | Lithium-ion battery comprising anode pole piece provided with strip non-foil parts |
| CN105244470A (en) * | 2015-09-11 | 2016-01-13 | 合肥国轩高科动力能源有限公司 | High-safety lithium ion laminated battery positive plate and preparation method thereof |
| CN109065839A (en) * | 2018-07-13 | 2018-12-21 | 珠海格力电器股份有限公司 | Full-lug positive plate, winding battery cell and manufacturing method thereof |
| CN211980766U (en) * | 2020-06-01 | 2020-11-20 | 安徽省银瑞电池科技有限公司 | Prevent electric core structure of short circuit and have its battery |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114843519A (en) * | 2022-05-26 | 2022-08-02 | 东莞锂威能源科技有限公司 | Current collector, positive plate, negative plate, laminated battery cell, battery and preparation method |
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