CN112615112A - Preparation method of tab welding slot, preparation method of pole piece and pole piece - Google Patents
Preparation method of tab welding slot, preparation method of pole piece and pole piece Download PDFInfo
- Publication number
- CN112615112A CN112615112A CN202011416737.3A CN202011416737A CN112615112A CN 112615112 A CN112615112 A CN 112615112A CN 202011416737 A CN202011416737 A CN 202011416737A CN 112615112 A CN112615112 A CN 112615112A
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- Prior art keywords
- groove
- preparation
- slot
- active material
- tab welding
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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
-
- 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
-
- 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
- H01M4/139—Processes of manufacture
-
- 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 provides a method for preparing a tab welding slot, which comprises the following steps: setting welding groove positions of lugs on the pole pieces; covering a baffle with a hollowed-out area in the set groove position, wherein the hollowed-out area is arranged corresponding to the set groove position, and an active substance layer covered by the groove position is exposed in the hollowed-out area; removing the active material layer covered by the groove position; and taking down the baffle plate to finish the preparation of the tab welding slot position. Compared with the prior art, the preparation method provided by the invention has the advantages that the baffle with the hollowed-out area is firstly adopted to cover the set groove position area, then the active material layer coated on the groove position is removed, the area of the groove position only needs to meet the welding requirement of the tab, no redundant foil is reserved, the space utilization inside the battery cell can be maximally improved, the filling amount of the active material is increased, the energy density of the battery cell is improved under the condition of not increasing the internal resistance of the battery, and the service life of the battery is prolonged.
Description
Technical Field
The invention relates to the field of lithium batteries, in particular to a preparation method of a tab welding slot, a preparation method of a pole piece and the pole piece.
Background
Lithium ion batteries have become an indispensable part in our lives, have high energy density and cycle life, are widely applied to the fields of mobile communication, digital science and technology, electric automobiles, energy storage and the like at present, and have the defects that the requirements on the lithium ion batteries and the materials thereof are difficult to estimate in the future and the matched upstream and downstream industrial chains have huge markets. Meanwhile, with the acceleration of modern life rhythm and the change of application scenes of the lithium battery, higher requirements are also put forward on the charge and discharge multiplying power of the battery.
The conventional lithium ion battery tab is arranged on one side of the pole piece, so that the charging and discharging rate performance can be influenced due to overhigh internal resistance of the battery during charging and discharging, and the surface temperature of the battery is increased. At present, the following two methods are generally adopted in the industry to reduce the internal resistance: 1) widening the tabs, and reducing the internal resistance of the battery by increasing the contact area of the tabs and the foil; 2) the internal resistance of the cell is reduced by reducing the coating amount and the rolling density. However, both methods reduce the filling amount of the active material in unit volume, lose part of the cell capacity and shorten the service time of the battery.
In view of the above, it is necessary to provide a technical solution to the above problems.
Disclosure of Invention
One of the objects of the present invention is: the lug groove prepared by the method disclosed by the invention maximally improves the utilization of the internal space of the battery cell and increases the filling amount of the active material, so that the energy density of the battery cell is improved, and the service life of the battery is prolonged.
In order to achieve the purpose, the invention adopts the following technical scheme:
a manufacturing method of a tab welding slot comprises the following steps:
setting welding groove positions of lugs on the pole pieces;
covering a baffle with a hollowed-out area in the set groove position, wherein the hollowed-out area is arranged corresponding to the set groove position, and an active substance layer covered by the groove position is exposed in the hollowed-out area;
removing the active material layer covered by the groove position;
and taking down the baffle plate to finish the preparation of the tab welding slot position.
Preferably, the removing comprises brushing and/or wiping; the brushing is carried out by adopting a hairbrush, and the wiping is carried out by adopting a wiping head or non-woven fabric.
Preferably, the brush is made of at least one of PBT, nylon, PP, PE, PVC, PVA, hog bristle, horsehair, grinding material nylon and sisal, and the Vickers hardness of the brush is 5-1000; the eraser head is made of silica gel or rubber, and the Shore hardness of the eraser head is 5-80.
Preferably, before removing the active material layer covered by the groove, a softening solvent is sprayed on the active material layer covered by the groove.
Preferably, before the baffle plate is covered on the set groove position, a softening solvent is sprayed on the active material layer covered by the groove position.
Preferably, after the baffle is taken down, the method further comprises the step of wiping the slot position by using a wiping head or non-woven fabric to finish the preparation of the tab welding slot position.
Preferably, the thickness of the baffle is 0.05-50 mm, and the Vickers hardness of the baffle is 5-3000.
The invention also aims to provide a preparation method of a tab welding slot, which comprises the following steps:
setting welding groove positions of lugs on the pole pieces;
spraying a softening solvent on the active material layer covered by the groove positions;
removing the active material layer covered by the groove position;
and removing residues of the slot positions to finish the preparation of the tab welding slot positions.
The invention also aims to provide a preparation method of a pole piece, which comprises the preparation method of the pole lug welding slot.
The fourth object of the present invention is to provide a pole piece obtained by the above-mentioned pole piece preparation method.
Compared with the prior art, the invention has the beneficial effects that:
1) according to the tab slot preparation method provided by the invention, the baffle with the hollowed-out area is firstly adopted to cover the set slot area, then the active material layer coated on the slot is removed, the area of the slot only needs to meet the welding requirement of the tab, no redundant foil is reserved, the space utilization inside the battery cell can be maximally promoted, the filling amount of the active material is increased, the energy density of the battery cell is promoted under the condition of not increasing the internal resistance of the battery, and the service time of the battery is prolonged.
2) The invention has high positioning precision and easy realization, has no residue on the welding groove surface of the tab after the active substance layer is removed, has no special environmental requirement and no harmful emission, and is more suitable for industrialized production application.
Drawings
FIG. 1 is a flow chart of example 1 of the present invention.
FIG. 2 is a flowchart of embodiment 5 of the present invention.
FIG. 3 is a flow chart of the structure of embodiment 5 of the present invention.
In the figure: 1-a baffle plate; 11-a hollowed-out area; 2-a brush; 3, wiping the head; 4-pole piece; 5-groove position; 51-active material layer covered by grooves.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the present invention and its advantages will be described in further detail below with reference to the following detailed description and the accompanying drawings, but the embodiments of the present invention are not limited thereto.
A manufacturing method of a tab welding slot comprises the following steps:
setting a welding slot position 5 of a pole lug for a pole piece 4 which is normally subjected to batching, coating, slitting or slitting;
covering the baffle 1 with the hollowed-out area 11 in the set slot position 5, wherein the hollowed-out area 11 is arranged corresponding to the set slot position 5, and the active substance layer 51 covered by the slot position is exposed in the hollowed-out area 11; preferably, the shape and the size of the hollow-out area 11 are the same as those of the slot 5, and the two are matched with each other exactly; the baffle 1 can be made of metal or waste metal materials, and has the advantages of abrasion resistance, corrosion resistance and difficult deformation. Wherein, the metal material includes but is not limited to stainless steel or titanium alloy, the nonmetal material includes but is not limited to at least one of nylon, PP, PE, PET; the thickness of the baffle 1 is 0.05-50 mm, and the Vickers hardness of the baffle 1 is 5-3000; the baffle 1 can be rectangular, square or polygonal in shape;
removing active material layer 51 covered by the groove;
and taking down the baffle 1 to finish the preparation of the tab welding slot 5.
Further, removing comprises brushing and/or wiping; the brushing is carried out by adopting a brush 2, and the wiping is carried out by adopting a wiping head 3 or non-woven fabrics. The brush 2 is made of at least one of PBT, nylon, PP, PE, PVC, PVA, bristles, horsehair, abrasive nylon and sisal, and has the characteristics of wear resistance and corrosion resistance, the shape of the brush head of the brush 2 can be at least one of round, barrel-shaped, spiral and special-shaped, the diameter of the brush hair of the brush 2 is 0.01-2 mm, and the Vickers hardness of the brush 2 is 5-1000; the brush 2 includes, but is not limited to, a servo motor or a pneumatic motor for driving brushing. The wiping head 3 has the characteristics of high fatigue resistance, high flexibility, corrosion resistance, aging resistance and the like, and is made of silica gel or rubber substances. The Shore hardness of the wiping head 3 is 5-80. The non-woven fabric includes, but is not limited to, at least one of polypropylene, polyester, nylon, viscose, acrylic, polyethylene, polyvinyl chloride, and cotton.
Further, before removing the active material layer 51 covered with the groove, a softening solvent is sprayed on the active material layer 51 covered with the groove. Alternatively, before the baffle 1 is covered on the set slot position 5, the active matter covered on the slot position 5 is sprayed with the softening solvent. The softening solvent includes but is not limited to at least one of NMP, EC, deionized water
Further, after the baffle 1 is taken down, the manufacturing method further comprises the step of wiping the slot 5 by using the wiping head 3 or non-woven fabric to finish the preparation of the tab welding slot 5.
Example 1
A manufacturing method of a tab welding slot comprises the following steps:
setting a welding slot position 5 of a pole lug for a pole piece 4 which is normally subjected to batching, coating, slitting or slitting;
covering the baffle 1 with the hollowed-out area 11 in the set slot position 5, wherein the hollowed-out area 11 is arranged corresponding to the set slot position 5, and the active substance layer 51 covered by the slot position is exposed in the hollowed-out area 11;
brushing off the active material layer 51 covered by the groove position by using a brush 2;
and taking down the baffle 1 to finish the preparation of the tab welding slot 5.
Example 2
A manufacturing method of a tab welding slot comprises the following steps:
setting a welding slot position 5 of a pole lug for a pole piece 4 which is normally subjected to batching, coating, slitting or slitting;
spraying a softening solvent on the active material layer 51 covered by the groove;
covering the baffle 1 with the hollowed-out area 11 in the set slot position 5, wherein the hollowed-out area 11 is arranged corresponding to the set slot position 5, and the active substance layer 51 covered by the slot position is exposed in the hollowed-out area 11;
brushing off the active material layer 51 covered by the groove position by using a brush 2;
and taking down the baffle 1 to finish the preparation of the tab welding slot 5.
Example 3
A manufacturing method of a tab welding slot comprises the following steps:
setting a welding slot position 5 of a pole lug for a pole piece 4 which is normally subjected to batching, coating, slitting or slitting;
covering the baffle 1 with the hollowed-out area 11 in the set slot position 5, wherein the hollowed-out area 11 is arranged corresponding to the set slot position 5, and the active substance layer 51 covered by the slot position is exposed in the hollowed-out area 11;
spraying a softening solvent on the active material layer 51 covered by the groove;
brushing off the active material layer 51 covered by the groove position by using a brush 2;
and taking down the baffle 1 to finish the preparation of the tab welding slot 5.
Example 4
A manufacturing method of a tab welding slot comprises the following steps:
setting a welding slot position 5 of a pole lug for a pole piece 4 which is normally subjected to batching, coating, slitting or slitting;
covering the baffle 1 with the hollowed-out area 11 in the set slot position 5, wherein the hollowed-out area 11 is arranged corresponding to the set slot position 5, and the active substance layer 51 covered by the slot position is exposed in the hollowed-out area 11;
spraying a softening solvent on the active material layer 51 covered by the groove;
brushing off the active material layer 51 covered by the groove position by using a brush 2;
and taking down the baffle 1, and wiping the slot 5 by using the wiping head 3 or the non-woven fabric to finish the preparation of the lug welding slot 5.
Example 5
A manufacturing method of a tab welding slot comprises the following steps:
setting a welding slot position 5 of a pole lug for a pole piece 4 which is normally subjected to batching, coating, slitting or slitting;
covering the baffle 1 with the hollowed-out area 11 in the set slot position 5, wherein the hollowed-out area 11 is arranged corresponding to the set slot position 5, and the active substance layer 51 covered by the slot position is exposed in the hollowed-out area 11;
spraying a softening solvent on the active material layer 51 covered by the groove;
brushing off the active material layer 51 covered by the groove position by using a brush 2;
wiping the slot 5 by using a wiping head 3 or non-woven fabric;
and taking down the baffle 1 to finish the preparation of the tab welding slot 5.
Example 6
A manufacturing method of a tab welding slot comprises the following steps:
setting a welding slot position 5 of a pole lug for a pole piece 4 which is normally subjected to batching, coating, slitting or slitting;
covering the baffle 1 with the hollowed-out area 11 in the set slot position 5, wherein the hollowed-out area 11 is arranged corresponding to the set slot position 5, and the active substance layer 51 covered by the slot position is exposed in the hollowed-out area 11;
spraying a softening solvent on the active material layer 51 covered by the groove;
wiping the active material layer 51 covered by the groove position by using the wiping head 3 or the non-woven fabric;
and (5) taking down the baffle 1, and removing residues in the slot 5 to finish the preparation of the tab welding slot 5.
Example 7
A manufacturing method of a tab welding slot comprises the following steps:
setting a welding slot position 5 of a pole lug for a pole piece 4 which is normally subjected to batching, coating, slitting or slitting;
spraying a softening solvent on the active material layer 51 covered by the groove;
covering the baffle 1 with the hollowed-out area 11 in the set slot position 5, wherein the hollowed-out area 11 is arranged corresponding to the set slot position 5, and the active substance layer 51 covered by the slot position is exposed in the hollowed-out area 11;
brushing off the active material layer 51 covered by the groove position by using a brush 2;
and taking down the baffle 1, and wiping the slot 5 by using the wiping head 3 or the non-woven fabric to finish the preparation of the lug welding slot 5.
Example 8
A manufacturing method of a tab welding slot comprises the following steps:
setting a welding slot position 5 of a pole lug for a pole piece 4 which is normally subjected to batching, coating, slitting or slitting;
spraying a softening solvent on the active material layer 51 covered by the groove;
covering the baffle 1 with the hollowed-out area 11 in the set slot position 5, wherein the hollowed-out area 11 is arranged corresponding to the set slot position 5, and the active substance layer 51 covered by the slot position is exposed in the hollowed-out area 11;
wiping the active material layer 51 covered by the groove position by using the wiping head 3 or the non-woven fabric;
and (5) taking down the baffle 1, and removing residues in the slot 5 to finish the preparation of the tab welding slot 5.
Example 9
A manufacturing method of a tab welding slot comprises the following steps:
setting a welding slot position 5 of a pole lug for a pole piece 4 which is normally subjected to batching, coating, slitting or slitting;
covering the baffle 1 with the hollowed-out area 11 in the set slot position 5, wherein the hollowed-out area 11 is arranged corresponding to the set slot position 5, and the active substance layer 51 covered by the slot position is exposed in the hollowed-out area 11;
spraying a softening solvent on the active material layer 51 covered by the groove;
taking down the baffle 1, and wiping the active material layer 51 covered by the groove position by using the wiping head 3 or the non-woven fabric;
and removing residues in the slot 5 to finish the preparation of the tab welding slot 5.
Example 10
A manufacturing method of a tab welding slot comprises the following steps:
setting a welding slot position 5 of a pole lug for a pole piece 4 which is normally subjected to batching, coating, slitting or slitting;
spraying a softening solvent on the active material layer 51 covered by the groove;
wiping the active material layer 51 covered by the groove position by using the wiping head 3 or the non-woven fabric;
and removing residues of the slot 5 to finish the preparation of the tab welding slot 5.
Example 11
A manufacturing method of a tab welding slot comprises the following steps:
setting a welding slot position 5 of a pole lug for a pole piece 4 which is normally subjected to batching, coating, slitting or slitting;
spraying a softening solvent on the active material layer 51 covered by the groove;
brushing off the active material layer 51 covered by the groove position by using a brush 2;
and removing residues of the slot 5 to finish the preparation of the tab welding slot 5.
Example 12
A preparation method of a pole piece comprises the preparation method of the pole lug welding slot 5 in any one of embodiments 1-11, and after the preparation of the pole lug welding slot 5 is completed, the pole piece 4 is placed into an oven for drying treatment, so that the preparation of the pole piece 4 is completed.
The preparation method of the tab welding slot 5 provided by the invention has the advantages of easiness in realization, high positioning precision, no residue on the surface of the foil for removing the active substance layer, no special environmental requirement and no harmful emission; still have high nimble mobility simultaneously, can switch at will and can realize the advantage of the setting of many shapes to the position of trench 5, can integrate the degree with current pole piece production line height, with low costs, be applicable to the production application of industrialization more.
Variations and modifications to the above-described embodiments may also occur to those skilled in the art, which fall within the scope of the invention as disclosed and taught herein. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious improvement, replacement or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. A preparation method of a tab welding slot is characterized by comprising the following steps:
setting welding groove positions of lugs on the pole pieces;
covering a baffle with a hollowed-out area in the set groove position, wherein the hollowed-out area is arranged corresponding to the set groove position, and an active substance layer covered by the groove position is exposed in the hollowed-out area;
removing the active material layer covered by the groove position;
and taking down the baffle plate to finish the preparation of the tab welding slot position.
2. The method of preparing tab welding slots according to claim 1, wherein the removing comprises brushing and/or wiping; the brushing is carried out by adopting a hairbrush, and the wiping is carried out by adopting a wiping head or non-woven fabric.
3. The method for preparing the tab welding groove according to claim 2, wherein the brush is made of at least one of PBT, nylon, PP, PE, PVC, PVA, hog bristle, horse hair, abrasive nylon and sisal, and the Vickers hardness of the brush is 5-1000; the eraser head is made of silica gel or rubber, and the Shore hardness of the eraser head is 5-80.
4. The method for preparing the tab welding groove according to claim 1, wherein a softening solvent is sprayed on the active material layer covered by the groove before the active material layer covered by the groove is removed.
5. The method for preparing the tab welding groove according to claim 1, wherein before the baffle plate is covered in the set groove, a softening solvent is sprayed on the active material layer covered in the groove.
6. The method for preparing the tab welding slot according to any one of claims 1 and 4 to 5, wherein after the baffle is removed, the method further comprises wiping the slot by using a wiping head or non-woven fabric to complete the preparation of the tab welding slot.
7. The method for preparing the tab welding groove as claimed in any one of claims 1 to 5, wherein the thickness of the baffle is 0.05 to 50mm, and the Vickers hardness of the baffle is 5 to 3000.
8. A preparation method of a tab welding slot is characterized by comprising the following steps:
setting welding groove positions of lugs on the pole pieces;
spraying a softening solvent on the active material layer covered by the groove positions;
removing the active material layer covered by the groove position;
and removing residues of the slot positions to finish the preparation of the tab welding slot positions.
9. A preparation method of a pole piece is characterized by comprising the preparation method of the pole lug welding slot in any one of claims 1 to 8.
10. A pole piece obtained by the method of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011416737.3A CN112615112A (en) | 2020-12-07 | 2020-12-07 | Preparation method of tab welding slot, preparation method of pole piece and pole piece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011416737.3A CN112615112A (en) | 2020-12-07 | 2020-12-07 | Preparation method of tab welding slot, preparation method of pole piece and pole piece |
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| CN112615112A true CN112615112A (en) | 2021-04-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011416737.3A Pending CN112615112A (en) | 2020-12-07 | 2020-12-07 | Preparation method of tab welding slot, preparation method of pole piece and pole piece |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013161773A (en) * | 2012-02-09 | 2013-08-19 | Panasonic Corp | Pole plate and secondary battery |
| CN104600250A (en) * | 2014-11-21 | 2015-05-06 | 天津力神电池股份有限公司 | Preparation method of lithium ion battery multi-pole-ear pole piece, preparation method of pole group and battery |
| CN111509185A (en) * | 2020-04-23 | 2020-08-07 | 惠州锂威新能源科技有限公司 | Protection assembly and method for removing pole piece coating residues |
| CN111668444A (en) * | 2020-05-22 | 2020-09-15 | 惠州锂威新能源科技有限公司 | Preparation method of multi-tab battery cell and multi-tab battery cell |
-
2020
- 2020-12-07 CN CN202011416737.3A patent/CN112615112A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013161773A (en) * | 2012-02-09 | 2013-08-19 | Panasonic Corp | Pole plate and secondary battery |
| CN104600250A (en) * | 2014-11-21 | 2015-05-06 | 天津力神电池股份有限公司 | Preparation method of lithium ion battery multi-pole-ear pole piece, preparation method of pole group and battery |
| CN111509185A (en) * | 2020-04-23 | 2020-08-07 | 惠州锂威新能源科技有限公司 | Protection assembly and method for removing pole piece coating residues |
| CN111668444A (en) * | 2020-05-22 | 2020-09-15 | 惠州锂威新能源科技有限公司 | Preparation method of multi-tab battery cell and multi-tab battery cell |
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Application publication date: 20210406 |