CN114864957A - Pole piece and lithium ion battery - Google Patents
Pole piece and lithium ion battery Download PDFInfo
- Publication number
- CN114864957A CN114864957A CN202210597084.6A CN202210597084A CN114864957A CN 114864957 A CN114864957 A CN 114864957A CN 202210597084 A CN202210597084 A CN 202210597084A CN 114864957 A CN114864957 A CN 114864957A
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- CN
- China
- Prior art keywords
- pole piece
- current collector
- active material
- lower side
- upper side
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- H01M4/64—Carriers or collectors
- H01M4/70—Carriers or collectors characterised by shape or form
- H01M4/78—Shapes other than plane or cylindrical, e.g. helical
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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
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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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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- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention belongs to the field of lithium ion batteries, and particularly relates to a pole piece and a lithium ion battery, which comprise a current collector and active substances arranged on the upper side and the lower side of the current collector; the left end and the right end of the current collector are provided with blank ends without active substances, and the lengths of the active substances arranged on the upper side and the lower side are different; one end of the left end and the right end of the active material on the upper side and the lower side is flush, and the length of the active material on the lower side of the other end is larger than that of the active material on the upper side; the blank end of the current collector at the end with uneven length is provided with sawtooth grains. The pole piece of this application has the processing of the pole piece front end mass flow body of active material to have the impressed watermark of height range difference through the single face, and the deformability that the mass flow body resisted the warpage is strengthened greatly like this, can effectively restrict the warpage of pole piece.
Description
Technical Field
The invention belongs to the field of lithium ion batteries, and particularly relates to a pole piece and a lithium ion battery.
Background
The lithium ion battery comprises a positive plate and a negative plate, wherein the positive plate and the negative plate both comprise (electrode powder) active substances and (metal) current collectors. The active material has different coating lengths on the two surfaces of the current collector, so that part of the pole piece only has the active material on one surface.
The pole piece can be expanded to a certain degree during rolling processing, the expansion rate of the active substance is different from that of the current collector, and the expansion rate of the current collector is lower. Due to the difference of the extension rates, the part of the pole piece with the active material on only one surface is warped, and the warping direction is from the active material surface to the metal current collector surface.
The warping of the pole piece can cause the pole piece to be converted into poor dead folding of the pole piece in a certain proportion in the battery processing and manufacturing process. The existing lithium battery industry can only control the dead folding defects of the pole pieces to a certain proportion, but can not completely eliminate the dead folding defects.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a pole piece and a lithium ion battery.
In order to achieve the purpose, the invention adopts the technical scheme that:
a pole piece comprises a current collector and active substances arranged on the upper side and the lower side of the current collector; the left end and the right end of the current collector are provided with blank ends without active substances, and the lengths of the active substances arranged on the upper side and the lower side are different; one end of the left end and the right end of the active material on the upper side and the lower side is flush, and the length of the active material on the lower side of the other end is larger than that of the active material on the upper side; the blank end of the current collector at one end of the active material with uneven length is provided with embossing.
The height range of the embossing is 0.1-20 times of the thickness of the current collector.
The embossing is arranged on the whole blank end or the partial blank end of the current collector at one end of the active material with uneven length.
The width of the sawtooth pattern is at least 0.5 times larger than the thickness of the current collector, and the key influence factor is the height range of the sawtooth pattern.
The distance between the tail end of the sawtooth pattern and the active substance on the lower side is more than 0 mm.
The sawtooth lines are wavy lines, trapezoidal lines and combinations.
The application also comprises a lithium ion battery containing the pole piece.
Compared with the prior art, the invention has the beneficial effects that:
the utility model provides a pole piece has the processing of active material's pole piece front end mass flow body for having the impressed watermark of difference in height through the single face, and the deformability that the mass flow body resisted the warpage is strengthened greatly like this, can effectively restrict the warpage of pole piece.
Drawings
FIG. 1 is a schematic diagram of a pole piece in the prior art;
FIG. 2 is a schematic structural diagram of a pole piece of the present application;
FIG. 3 is a schematic view of a partial structure of a pole piece of the present application;
FIG. 4 is a schematic diagram of the sawtooth pattern mechanism of the present application.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and preferred embodiments.
Fig. 1 shows a form of a prior art pole piece, which includes a current collector 101 and active materials 102 disposed on upper and lower sides of the current collector; the left end and the right end of the current collector are provided with blank ends without active substances, and the lengths of the active substances arranged on the upper side and the lower side are different; the active materials on the upper and lower sides (upper active material 305 and lower active material 306) have their one ends flush with each other, and the active material on the lower side is longer than the active material on the upper side. Since the expansion rate of the active material and the expansion rate of the current collector are different, among them, the expansion rate of the current collector is low. Due to the difference of the extension rates, the part of the pole piece with the active material on only one surface is warped, and the warping direction is from the active material surface to the metal current collector surface.
Fig. 2-4 illustrate a pole piece of the present application, including a current collector 101 and active materials 102 disposed on the upper and lower sides of the current collector; the left end and the right end of the current collector are provided with blank ends without active substances, and the lengths of the active substances arranged on the upper side and the lower side are different; the active material on the upper and lower sides (upper active material 305, lower active material 306) has one of the left and right ends flush with each other, and the active material on the lower side of the other end is longer than the active material on the upper side; the blank end of the current collector at the end of the active material that is not flush in length is provided with an embossment 201.
The height range 301 of the embossments is 0.1-20 times of the thickness of the current collector. The embossing is arranged on the whole blank end or part of the blank end of the current collector at one end with uneven length. Preferably, the width 302 of the embossments is at least 0.5 times larger than the thickness of the current collector at the partially blank end. The distance 303 between the tail end of the embossing and the lower active material 306 is more than 0mm, so that the thickness of the battery is prevented from being influenced.
The embossing is a sawtooth pattern 501, a wave pattern 502, a trapezoidal pattern 503 and a combination 504 of the wave pattern and the trapezoidal pattern. The embossing is formed by pressing a current collector.
In this application in the wide metal copper of the actual use 6um thick, 76.5mm as the mass flow body preparation pole piece, the impressed watermark is the sawtooth line, and the width of sawtooth line is 2mm, and the height range of sawtooth line is 9um, and when the terminal distance upside active material of sawtooth line was 4mm, the warpage phenomenon of pole piece disappeared completely. The bad dead fold of the pole piece is completely eliminated.
Through testing pole pieces with different pole piece widths and compaction densities, for the pole piece with a smaller pole piece width (the pole piece width is 18.8mm) and a lower pole piece compaction density (approximately equal to 1.50g/cm3), the warping process is lighter, and the height range of embossing is 0.1 time of the thickness of the current collector, so that the warping of the pole piece can be eliminated.
For the pole piece with a relatively large pole piece width (the pole piece width is 115.4mm) and a relatively low pole piece compaction density (approximately equal to 1.75g/cm3), the warping degree is relatively severe, and the height difference of the embossments is 20 times of the thickness of the current collector, so that the warping of the pole piece can be eliminated. (pole piece compaction density calculation formula ═ pole powder active material surface coating density/(pole piece thickness after rolling-metal current collector thickness)).
The application also comprises a lithium ion battery, which contains the pole piece, and in the subsequent processing process, because the pole piece is extruded, the embossing height range difference is greatly reduced, and the adverse effect is not caused on the thickness of the finished battery.
The above description is only a preferred embodiment of the present invention, and it should be noted that the upper, lower, left and right of the present application correspond to relative positional relationships only, and the specific positions thereof are not limited; it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention, and such modifications and adaptations are intended to be within the scope of the invention.
Claims (7)
1. A pole piece is characterized by comprising a current collector and active substances arranged on the upper side and the lower side of the current collector; the left end and the right end of the current collector are provided with blank ends without active substances, and the lengths of the active substances arranged on the upper side and the lower side are different; one end of the left end and the right end of the active material on the upper side and the lower side is flush, and the length of the active material on the lower side of the other end is larger than that of the active material on the upper side; the blank end of the current collector at one end of the active material with uneven length is provided with an embossing with height and pole difference.
2. The pole piece of claim 1, wherein the embossed height step is 0.1-20 times the current collector thickness.
3. The pole piece of claim 1, wherein the embossments are disposed on the entire blank end or a portion of the blank end of the current collector at the end of the active material that is not flush in length.
4. The pole piece of claim 3, wherein the width of the embossments is at least 0.5 times greater than the thickness of the current collector.
5. A pole piece according to claim 3, wherein the distance from the end of the embossments to the active material on the underside is > 0 mm.
6. The pole piece of claim 1, wherein the embossings having high and low range differences are selected from the group consisting of serrations, undulations, trapezoids, and combinations thereof.
7. A lithium ion battery comprising the electrode sheet of any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210597084.6A CN114864957A (en) | 2022-05-30 | 2022-05-30 | Pole piece and lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210597084.6A CN114864957A (en) | 2022-05-30 | 2022-05-30 | Pole piece and lithium ion battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114864957A true CN114864957A (en) | 2022-08-05 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210597084.6A Pending CN114864957A (en) | 2022-05-30 | 2022-05-30 | Pole piece and lithium ion battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114864957A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113707887A (en) * | 2021-08-19 | 2021-11-26 | 曙鹏科技（深圳）有限公司 | Pole piece, cylindrical winding type battery cell and lithium ion battery |
| CN216488185U (en) * | 2021-06-29 | 2022-05-10 | 比亚迪股份有限公司 | Battery cell and battery with same |
-
2022
- 2022-05-30 CN CN202210597084.6A patent/CN114864957A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN216488185U (en) * | 2021-06-29 | 2022-05-10 | 比亚迪股份有限公司 | Battery cell and battery with same |
| CN113707887A (en) * | 2021-08-19 | 2021-11-26 | 曙鹏科技（深圳）有限公司 | Pole piece, cylindrical winding type battery cell and lithium ion battery |
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Effective date of registration: 20230206 Address after: 300457 No. 38, Haitai South Road, Binhai high tech Industrial Development Zone (outer ring), Binhai New Area, Tianjin Applicant after: TIANJIN LISHEN BATTERY JOINT-STOCK Co.,Ltd. Applicant after: Tianjin Juyuan New Energy Technology Co.,Ltd. Address before: 300457 No. 38, Haitai South Road, Binhai high tech Industrial Development Zone (outer ring), Binhai New Area, Tianjin Applicant before: TIANJIN LISHEN BATTERY JOINT-STOCK Co.,Ltd. |