CN111554876A - Novel slitting-free pole piece structure of lithium ion power battery - Google Patents
Novel slitting-free pole piece structure of lithium ion power battery Download PDFInfo
- Publication number
- CN111554876A CN111554876A CN202010372298.4A CN202010372298A CN111554876A CN 111554876 A CN111554876 A CN 111554876A CN 202010372298 A CN202010372298 A CN 202010372298A CN 111554876 A CN111554876 A CN 111554876A
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- China
- Prior art keywords
- pole piece
- foil
- active material
- battery
- power battery
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/021—Physical characteristics, e.g. porosity, surface area
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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
Abstract
The invention discloses a novel slitting-free pole piece structure of a lithium ion power battery, which comprises a foil main body and an active substance layer coated on the surface of the foil main body; the reserved foil (4) and the foil tabs (1) are longitudinally distributed on the left side and the right side of the active substance area (2), the active substance area is close to one side edge of the reserved foil and is provided with a cut active substance (3) which is longitudinally distributed and has a preset width; the right side of the cut active material has a virtual cutting line (30); the virtual cutting line is the edge of the pole piece after punching operation of the punching equipment. According to the invention, the process structure of the battery is optimized, and the process route of the battery is further optimized, so that the problem of decoiling of the pole roll after being baked by an oven can be solved, the rolled pole piece does not need to be cut, the pole piece cutting procedures can be reduced, and the production cost of the battery is reduced.
Description
Technical Field
The invention relates to the technical field of manufacturing of lithium ion batteries, in particular to a novel slitting-free pole piece structure of a lithium ion power battery.
Background
At present, lithium ion batteries have the advantages of high specific energy, high cycle frequency, long storage time and the like, are widely applied to portable electronic devices (such as mobile phones, digital video cameras and portable computers), are also widely applied to large and medium-sized electric devices such as electric automobiles, electric bicycles and electric tools, and become one of the power sources which are spotlighted, and therefore, the performance requirements of the lithium ion batteries are higher and higher.
Moisture is a natural enemy of the lithium ion battery, and for the lithium ion battery, the moisture content of the pole roll must be controlled within a certain range, so that the pole roll must be placed in an oven and can be transferred to the subsequent stage through a baking process, but the pole roll is easy to be unrolled after being baked. The decoiling is that the alignment degree of the side surface of the pole roll is changed due to stress release when the pole roll is baked, and the yield in the production of the battery is seriously influenced.
Therefore, there is an urgent need to develop a technology that can effectively solve the problem of decoiling of the battery electrode roll during and after baking.
Disclosure of Invention
The invention aims to provide a novel slitting-free process of a lithium ion power battery, aiming at the technical defects in the prior art.
Therefore, the invention provides a novel slitting-free pole piece structure of a lithium ion power battery, which comprises a battery pole piece foil main body and an active substance layer coated on the surface of the battery pole piece foil main body;
the battery pole piece foil main body is provided with an active material area which is longitudinally distributed, and the surface of the active material area is coated with an active material layer;
the reserved foil and the foil tabs are longitudinally distributed on the left side and the right side of the active substance area, the active substance area is close to one side edge of the reserved foil and is provided with cut active substances which are longitudinally distributed and have preset widths;
the right side of the cut active material is provided with a virtual cutting line;
the virtual cutting line is the edge of the pole piece after punching operation of the punching equipment.
The novel slitting-free pole piece structure is obtained by spreading a pole roll with qualified moisture after baking out into a pole piece shape.
Wherein the width of the reserved foil is 2-4 mm.
The width of the cut active material and the width of the reserved foil are within the size range allowed by a sheet punching machine die and a vacuum chuck of external battery pole piece punching equipment.
When the main body of the foil material of the positive pole piece is an aluminum foil, the surface of the active material area is coated with a positive active material layer;
when the main body of the negative pole piece foil material is copper foil, the surface of the active material area is coated with a negative active material layer.
Compared with the prior art, the novel slitting-free pole piece structure of the lithium ion power battery is scientific in structural design, the structural design of the pole piece is optimized, the problem of unwinding of a pole roll (namely, the pole roll obtained after winding the pole piece) after being baked by an oven can be solved, slitting operation of the rolled pole piece (the pole piece is unreeled after being baked and is obtained after being rolled by a battery pole piece rolling machine) is not needed, slitting processes of the pole piece can be reduced, the production cost of the battery is reduced, the price competitive advantage of the lithium ion battery is improved, and the slitting-free pole piece structure has great production practice significance.
Drawings
Fig. 1 is a schematic diagram of a novel slitting-free pole piece structure of a lithium ion power battery provided by the invention;
in the figure: 1 is a foil tab, 2 is an active material area, 3 is a cut active material, and 4 is a reserved foil.
Detailed Description
In order that those skilled in the art will better understand the technical solution of the present invention, the following detailed description of the present invention is provided in conjunction with the accompanying drawings and embodiments.
Referring to fig. 1, the present invention provides a novel slitting-free pole piece structure of a lithium ion power battery, including a battery pole piece foil main body (for example, a positive pole piece foil main body is an aluminum foil, a negative pole piece foil main body is a copper foil) and an active material layer coated on the surface of the battery pole piece foil main body;
the battery pole piece foil main body is provided with an active material area 2 which is longitudinally distributed, and the surface of the active material area 2 is coated with an active material layer (such as a positive electrode active material layer or a negative electrode active material layer);
the reserved foil 4 and the foil tabs 1 are longitudinally distributed on the left side and the right side of the active material area 2, the active material area is close to one side edge of the reserved foil 4 and is provided with a cut active material 3 which is longitudinally distributed and has a preset width;
the right side of the cut active material 3 has a virtual cutting line 30;
the virtual cutting line 30 is used for enabling an external battery pole piece punching device (such as a sheet punching machine) to perform punching operation along the virtual cutting line 30, so as to cut the cut active material 3 and the reserved foil 4.
In the invention, the novel slitting-free pole piece structure is obtained by spreading the pole roll with qualified moisture after baking into a pole piece shape.
In the invention, the width of the foil 4 is reserved, preferably 2-4 mm, so that the material cost of the foil can be saved, material blocking caused during punching operation can be avoided, in addition, the rolled pole roll does not need to be cut, and punching operation can be directly performed after the pole roll is baked.
It should be noted that the width of the reserved foil 4 is only reserved for 2-4 mm, and the foil tabs 1 and the reserved foil 4 are distributed on two sides of the active material area 2, so that the problem of roll separation during baking of the electrode roll can be solved.
It should be noted that, in the present invention, the process route of battery production is: coating, rolling, slitting, baking and punching. The coating process is to uniformly coat the active substance on the surface of the foil tab and dry the active substance to attach the active substance on the surface of the foil tab. The rolling process is to roll the pole piece into the thickness required by a client by utilizing a plurality of large-tonnage round rollers under the action of a hydraulic press. When the pole piece rolls, the active material takes place to extend, is cut active material and hardly guarantees alignment degree and even thickness. In order to improve the situation, the general process is to cut the pole piece after rolling, cut off the cut active substance 3 and the reserved foil 4, and roll the pole piece into a pole roll. And after the baking moisture of the pole roll is qualified, spreading the pole roll for punching, namely cutting the pole roll into pole pieces meeting the requirements of customers.
In the invention, the cut active substance 3 and the reserved foil 4 are not cut before baking, so that stress can not be generated, and the polar coil can not be unrolled due to the axial force generated by stress release in the baking process.
It should be noted that after the battery pole piece shown in fig. 1 is rolled, the pole piece does not need to be cut, and after the pole roll is baked, the punching operation is directly performed, so that the cut active material 3 and the reserved foil 4 (adjacent to the cut active material) are cut off.
The reserved foil and the adjacent cut active materials are cut in the punching process, so that the cutting process is omitted, and the price advantage of the lithium ion battery is improved.
In the invention, in the concrete implementation, the widths of the cut active material 3 and the reserved foil 4 are within the size range allowed by a sheet punching machine die and a vacuum chuck of external battery sheet punching equipment, otherwise, the vacuum pump is easy to overload to cause the accumulation of the sheets.
It should be noted that, according to the invention, the novel slitting-free pole piece structure of the lithium ion power battery is designed, so that the novel slitting-free process of the lithium ion power battery can be realized, and by optimizing the process route of the battery, the problem of unwinding of the pole roll after being baked by an oven can be solved, and the slitting process of the pole roll can be reduced.
It should be noted that, along with the subsidy and the moving back of the slope and the continuous competition of the battery manufacturers at home and abroad, the cost of the lithium ion power battery is reduced year by year, and one process can be reduced, which is very important for reducing the cost.
The novel slitting-free pole piece structure of the lithium ion power battery provided by the invention can realize the slitting-free process of the lithium ion power battery, saves a pole piece slitting process in a market environment with the cost of the lithium ion battery industry reduced year by year, and has great production practice significance for improving the production efficiency of the battery, reducing the production cost and improving the competitiveness of a battery product.
In summary, compared with the prior art, the novel slitting-free pole piece structure of the lithium ion power battery provided by the invention has a scientific structural design, can solve the problem of unwinding of a pole roll (namely, the pole roll obtained after winding the pole piece) after being baked by an oven by optimizing the structural design of the pole piece, does not need to perform slitting operation on the rolled pole piece (the pole piece is unwound after being baked and is obtained after being rolled by a battery pole piece rolling machine), can reduce the slitting process of the pole piece, thereby reducing the production cost of the battery, improving the price competitive advantage of the lithium ion battery, and having great production practice significance.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (5)
1. A novel slitting-free pole piece structure of a lithium ion power battery is characterized by comprising a battery pole piece foil main body and an active substance layer coated on the surface of the battery pole piece foil main body;
the battery pole piece foil main body is provided with active material areas (2) which are longitudinally distributed, and the surfaces of the active material areas (2) are coated with active material layers;
the reserved foil (4) and the foil tabs (1) are longitudinally distributed on the left side and the right side of the active substance area (2), the active substance area is close to one side edge of the reserved foil and is provided with a cut active substance (3) which is longitudinally distributed and has a preset width;
the right side of the cut active material has a virtual cutting line (30); the virtual cutting line is the edge of the pole piece after punching operation of the punching equipment.
2. The novel slitting-free pole piece structure of the lithium-ion power battery as claimed in claim 1, wherein the slitting-free pole piece structure is obtained by spreading a pole roll with qualified moisture after baking out and then forming the pole roll into a pole piece shape.
3. The novel slitting-free pole piece structure of the lithium-ion power battery as claimed in claim 1, wherein the width of the reserved foil (4) is 2-4 mm.
4. The novel slitting-free pole piece structure of the lithium-ion power battery as claimed in claim 1 or 2, wherein the widths of the active material (3) to be slit and the reserved foil (4) are within the size range allowed by a punching machine die and a vacuum chuck of an external battery pole piece punching device.
5. The novel slitting-free pole piece structure of the lithium-ion power battery as claimed in any one of claims 1 to 4, wherein when the main body of the foil of the positive pole piece is aluminum foil, the surface of the active material region (2) is coated with a positive active material layer;
when the main body of the negative pole piece foil is copper foil, the surface of the active material area (2) is coated with a negative active material layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010372298.4A CN111554876A (en) | 2020-05-06 | 2020-05-06 | Novel slitting-free pole piece structure of lithium ion power battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010372298.4A CN111554876A (en) | 2020-05-06 | 2020-05-06 | Novel slitting-free pole piece structure of lithium ion power battery |
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| CN111554876A true CN111554876A (en) | 2020-08-18 |
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| CN202010372298.4A Pending CN111554876A (en) | 2020-05-06 | 2020-05-06 | Novel slitting-free pole piece structure of lithium ion power battery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114497914A (en) * | 2022-01-29 | 2022-05-13 | 珠海冠宇电池股份有限公司 | Electrode assembly, battery and manufacturing method thereof |
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2020
- 2020-05-06 CN CN202010372298.4A patent/CN111554876A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114497914A (en) * | 2022-01-29 | 2022-05-13 | 珠海冠宇电池股份有限公司 | Electrode assembly, battery and manufacturing method thereof |
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Effective date of registration: 20220125 Address after: 266500 Minshan Road, Huangdao District, Qingdao, Shandong Applicant after: LISHEN (QINGDAO) NEW ENERGY CO.,LTD. Address before: 300384 Tianjin Binhai New Area Binhai high tech Industrial Development Zone Huayuan science and Technology Park (outer ring) 38 Haitai South Road Applicant before: LISHEN POWER BATTERY SYSTEMS Co.,Ltd. |