CN112510244A - Electrode lug shaping and welding method of full-electrode-lug cylindrical winding core and full-electrode-lug cylindrical winding core formed by same - Google Patents
Electrode lug shaping and welding method of full-electrode-lug cylindrical winding core and full-electrode-lug cylindrical winding core formed by same Download PDFInfo
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- CN112510244A CN112510244A CN202011500212.8A CN202011500212A CN112510244A CN 112510244 A CN112510244 A CN 112510244A CN 202011500212 A CN202011500212 A CN 202011500212A CN 112510244 A CN112510244 A CN 112510244A
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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
- H01M10/04—Construction or manufacture in general
- H01M10/0422—Cells or battery with cylindrical casing
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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
- H01M10/04—Construction or manufacture in general
- H01M10/0431—Cells with wound or folded electrodes
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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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Abstract
The application relates to a tab shaping and welding method of a full-tab cylindrical winding core and a full-tab cylindrical winding core formed by the same, belonging to the technical field of batteries. The method comprises the following steps: (1) shaping the negative end face of the full-lug cylindrical winding core, (2) installing a negative insulating ring, (3) installing a negative current collecting ring, (4) arc-welding the negative lug and the inner wall of the negative current collecting ring, and (5) adopting the same shaping process and welding mode on the positive end face. The application has the following technical effects and advantages: the pole ear of the cylindrical winding core is formed by shaping instead of cutting the pole ear, so that the equipment investment can be effectively reduced, the production efficiency is improved, and the production cost is reduced; the shaped annular tab and the annular positive and negative electrode annular current collecting rings are welded on the side surface of the high-out-of-roll core body instead of the end surface of the roll core body, so that the phenomenon that the diaphragm is burnt due to the fact that a copper-aluminum foil kneading plane is welded during end surface welding can be avoided, the qualified rate of finished products is improved, material loss is reduced, and the short circuit and self-discharge risks of the battery are greatly reduced.
Description
Technical Field
The application relates to a tab shaping and welding method of a full-tab cylindrical winding core and a full-tab cylindrical winding core formed by the same, belonging to the technical field of batteries.
Background
Cylindrical batteries have high production automation degree, high production efficiency and good battery consistency, and have wider application fields, and along with increasing requirements on battery energy in the fields of new energy vehicles, energy storage and the like, a plurality of small-capacity cylindrical batteries are connected in series and in parallel to form a large-capacity and high-voltage battery pack. When a plurality of batteries are used in series-parallel connection, the consistency requirements on the capacity, the internal resistance, the self-discharge performance and other performances of the batteries are high; the consistency of the capacity and the internal resistance of the battery can be easily controlled and confirmed in the production process, but the difference of the self-discharge consistency of the battery can be hardly confirmed in the production and detection processes.
For this reason, in patents CN102901931A, CN105598044A, CN105598044A, CN107991627A and CN105633472A, etc., batteries with significant self-discharge are screened by optimizing resting temperature, SOC, time, etc., but abnormal self-discharge batteries with small self-discharge difference or occurring in different use stages cannot be screened and controlled; in patents CN206373482U, CN204449620U, CN210937646U, CN211679237U and CN211866861U, etc., the problem of removing dust in the battery production process, especially in the tab welding process, is partially solved, and the problem of self-discharge of the battery is solved from the source; however, the problems of penetration of the electrode assembly and welding slag residue caused by welding of the end face current collector as described in the patent CN204441382U cannot be solved by cleaning and protection.
Disclosure of Invention
In order to solve the problems, the application provides a tab shaping and welding method of a full-tab cylindrical winding core. The method comprises the following steps: (1) shaping the negative end face of the full-lug cylindrical winding core, (2) installing a negative insulating ring, (3) installing a negative current collecting ring, (4) arc-welding the negative lug and the inner wall of the negative current collecting ring, and (5) adopting the same shaping process and welding mode on the positive end face.
This application the cylindrical book core of full utmost point ear is formed by crisscross coiling of positive plate, negative pole piece and diaphragm, and wherein the foil that does not scribble active material is all left to one side of positive plate and negative pole piece, arranges the both sides of rolling up the core respectively after coiling, forms anodal terminal surface and the negative pole terminal surface of constituteing by the multilayer foil respectively.
The shaping of the negative electrode tab is realized by axially flattening foils in a circular central area and an outer ring area of the end face of the negative electrode through a shaping mechanism, wherein the foils in the annular middle area keep the original height, and the annular middle area is 1-5 mm higher than the circular central area; the number of layers of the foil in the annular middle area is determined by the design flow guiding capacity of the winding core.
This application the cylindrical book core of full utmost point ear, negative pole terminal surface installation negative pole insulating ring after the plastic, then install negative pole mass flow circle above that, annular negative pole mass flow circle inner wall is in the same place with the laminating of annular negative pole ear outer layer after the plastic.
The welding of negative pole ear and negative pole converge the cap and can adopt any one welding mode in modes such as ultrasonic welding, resistance welding, argon arc welding, laser welding, weld annular negative pole ear and annular negative pole current collecting ring.
The positive electrode end face can also be shaped and welded by the same method as the negative electrode end face.
The full-lug cylindrical winding core formed according to the method comprises a positive electrode end face and a negative electrode end face which are formed by winding a plurality of layers of foils with edges not coated with active materials, wherein the positive electrode end face and the negative electrode end face are axially flattened into a circular central area and an outer ring area for shaping the foils through a shaping mechanism, the full-lug cylindrical winding core further comprises an annular middle area positioned in the circular central area and the outer ring area, the foils in the annular middle area keep the original height, and the foils in the annular middle area are 1-5 mm higher than the foils in the circular central area and the outer ring area.
In addition, positive and negative electrode insulating rings are respectively arranged on the positive and negative electrode end faces, and annular positive and negative electrode current collecting rings which are attached to the outer layers of the annular tabs on the positive and negative electrode end faces are arranged on the insulating rings.
In addition, the annular positive and negative current collecting rings are respectively welded with the annular tabs on the end surfaces of the positive and negative electrodes in an ultrasonic welding mode, a resistance welding mode, an argon arc welding mode and/or a laser welding mode.
The application has the following technical effects and advantages:
(1) the pole ear of the cylindrical winding core is formed by shaping instead of cutting the pole ear, so that the equipment investment can be effectively reduced, the production efficiency is improved, and the production cost is reduced;
(2) the shaped annular tab and the annular positive and negative electrode annular current collecting rings are welded on the side surface of the high-out-of-roll core body instead of the end surface of the roll core body, so that the phenomenon that the diaphragm is burnt due to the fact that a copper-aluminum foil kneading plane is welded during end surface welding can be avoided, the qualified rate of finished products is improved, material loss is reduced, and the short circuit and self-discharge risks of the battery are greatly reduced.
Drawings
Fig. 1 is an exploded view of a cylindrical winding core of the present application.
Fig. 2 is a schematic view of core shaping according to the present application.
Fig. 3 is a top view of the core shaping end face of the present application.
Fig. 4 is a side view of a reeling core shaping end face of the present application.
Fig. 5 is a schematic view of the welding of the negative tab and the negative current collector of the present application.
Detailed Description
The following detailed description of embodiments of the present application refers to the accompanying drawings. The following examples are intended to illustrate the present application but are not intended to limit the scope of the present application.
In the attached drawing, 1 is a winding core, 2 is a negative electrode insulating ring, 3 is a negative electrode current collecting ring, 4 is a positive electrode insulating ring, and 5 is a positive electrode current collecting ring.
The overall technical scheme of the application is as follows: the method comprises the following steps: (1) shaping the negative end face of the full-lug cylindrical winding core, (2) installing a negative insulating ring, (3) installing a negative current collecting ring, (4) arc-welding the negative lug and the inner wall of the negative current collecting ring, and (5) adopting the same shaping process and welding mode on the positive end face.
This application the cylindrical book core of full utmost point ear is formed by crisscross coiling of positive plate, negative pole piece and diaphragm, and wherein the foil that does not scribble active material is all left to one side of positive plate and negative pole piece, arranges the both sides of rolling up the core respectively after coiling, forms anodal terminal surface and the negative pole terminal surface of constituteing by the multilayer foil respectively.
The shaping of the negative electrode tab is realized by axially flattening foils in a circular central area and an outer ring area of the end face of the negative electrode through a shaping mechanism, wherein the foils in the annular middle area keep the original height, and the annular middle area is 1-5 mm higher than the circular central area; the number of layers of the foil in the annular middle area is determined by the design flow guiding capacity of the winding core.
This application the cylindrical book core of full utmost point ear, negative pole terminal surface installation negative pole insulating ring after the plastic, then install negative pole mass flow circle above that, annular negative pole mass flow circle inner wall is in the same place with the laminating of annular negative pole ear outer layer after the plastic.
The welding of negative pole ear and negative pole converge the cap and can adopt any one welding mode in modes such as ultrasonic welding, resistance welding, argon arc welding, laser welding, weld annular negative pole ear and annular negative pole current collecting ring. The positive electrode end face can also be shaped and welded by the same method as the negative electrode end face.
The full-lug cylindrical winding core formed according to the method comprises a positive electrode end face and a negative electrode end face which are formed by winding a plurality of layers of foils with edges not coated with active materials, wherein the positive electrode end face and the negative electrode end face are axially flattened into a circular central area and an outer ring area for shaping the foils through a shaping mechanism, the full-lug cylindrical winding core further comprises an annular middle area positioned in the circular central area and the outer ring area, the foils in the annular middle area keep the original height, and the foils in the annular middle area are 1-5 mm higher than the foils in the circular central area and the outer ring area.
In addition, positive and negative electrode insulating rings are respectively arranged on the positive and negative electrode end faces, and annular positive and negative electrode current collecting rings which are attached to the outer layers of the annular tabs on the positive and negative electrode end faces are arranged on the insulating rings.
In addition, the annular positive and negative current collecting rings are respectively welded with the annular tabs on the end surfaces of the positive and negative electrodes in an ultrasonic welding mode, a resistance welding mode, an argon arc welding mode and/or a laser welding mode.
Fig. 1 is an exploded view of a cylindrical winding core of the present application. And a negative electrode insulating ring 2 is arranged on the negative electrode end face of the shaped winding core 1, then an annular negative electrode current collecting ring 3 is arranged on the negative electrode insulating ring, and the inner wall of the negative electrode current collecting ring 3 is attached to the outer side of the shaped annular negative electrode lug and welded together.
Fig. 2 is the core shaping schematic diagram of this application, and fig. 3 is the core shaping terminal surface top view of this application, and fig. 4 is the core shaping terminal surface side view of this application. As shown in fig. 2, 3 and 4, the shaping of the negative electrode tab is realized by axially flattening foils in a circular central area and an outer ring area of the end surface of the negative electrode by a shaping mechanism, wherein the foils in the annular middle area keep the original height, and the foils in the annular middle area are 1-5 mm higher than the foils in the circular central area and the outer ring area; the number of layers of the foil in the annular middle area is determined by the design flow guiding capacity of the winding core.
Fig. 5 is a schematic diagram illustrating welding of the negative electrode tab and the negative current collecting ring according to the present application, in which the annular negative electrode tab and the negative current collecting ring are welded together by any one or more welding methods of ultrasonic welding, resistance welding, argon arc welding, laser welding, and the like. The welding area is higher than the side surface of the winding core body but not at the end surface of the winding core body, so that the foil which is shaped and pressed downwards is prevented from being welded and penetrated during end surface welding, and the diaphragm is prevented from being burnt; meanwhile, the shaping and pressing foil can effectively prevent welding slag from entering the winding core body, and the risks of short circuit and self-discharge of the battery are reduced.
The shaping and welding of the annular positive lug can also be carried out on the positive end face by adopting the same method as that of the negative end face.
Example (b):
by adopting the tab shaping and welding process of the full-tab cylindrical winding core, 1000 32135-14Ah cylindrical lithium iron phosphate batteries are manufactured, and compared with the 32135-14Ah cylindrical lithium iron phosphate batteries adopting end face welding, the short circuit rate of the tab welding is reduced to 0.07% from 0.32%, and the self-discharge failure rate of the battery is reduced to 0.03% from 0.12%.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application.
Claims (9)
1. A tab shaping and welding method for a full-tab cylindrical winding core comprises the following steps: (1) shaping the negative end face of the full-lug cylindrical winding core, (2) installing a negative insulating ring, (3) installing a negative current collecting ring, (4) arc-welding the negative lug and the inner wall of the negative current collecting ring, and (5) adopting the same shaping process and welding mode on the positive end face.
2. The method for shaping and welding the tabs of the full-tab cylindrical winding core according to claim 1, wherein the full-tab cylindrical winding core is formed by winding a positive plate, a negative plate and a diaphragm in a staggered manner, wherein foils without coating active materials are left on one side of the positive plate and one side of the negative plate, and the foils are respectively placed on two sides of the winding core after being wound to respectively form a positive end face and a negative end face which are composed of multiple layers of foils.
3. The method for reshaping and welding the tabs of the full-tab cylindrical winding core according to claims 1 and 2, characterized in that the reshaping of the negative electrode tabs is realized by axially flattening the foils in the circular central area and the outer ring area of the end surface of the negative electrode through a reshaping mechanism, the foils in the annular middle area keep the original height, and the foils in the annular middle area are 1-5 mm higher than the foils in the circular central area and the outer ring area; the number of layers of the foil in the annular middle area is determined by the design flow guiding capacity of the winding core.
4. The method for reshaping and welding the tab of the all-tab cylindrical winding core according to claim 3, wherein a negative insulating ring is installed on the reshaped negative end surface, a negative current collecting ring is installed on the negative insulating ring, and the inner wall of the annular negative current collecting ring is attached to the reshaped outer layer of the annular negative tab.
5. The method for reshaping and welding the tab of the full-tab cylindrical winding core according to claim 4, wherein the annular negative tab and the annular negative current collecting ring are welded together by any one or more welding methods selected from ultrasonic welding, resistance welding, argon arc welding, laser welding and the like.
6. The method for reshaping and welding the tab of the full-tab cylindrical winding core according to claim 5, wherein the reshaping and welding of the annular tab can be performed on the positive electrode end face by the same method.
7. The cylindrical full-lug winding core formed by the method according to claim 1 is characterized by comprising a positive electrode end face and a negative electrode end face which are formed by winding a plurality of layers of foils with edges not coated with active materials, wherein the positive electrode end face and the negative electrode end face are axially flattened by a shaping mechanism to form a circular central area and an outer ring area which are shaped by the foils, the cylindrical full-lug winding core further comprises an annular middle area which is positioned in the circular central area and the outer ring area, the foils in the annular middle area keep the original height, and the foils in the annular middle area are 1-5 mm higher than the foils in the circular central area and the outer ring area.
8. The cylindrical winding core with the full tab according to claim 7, wherein the positive and negative end faces are respectively provided with a positive insulating ring and a negative insulating ring, and the insulating rings are provided with annular positive and negative current collecting rings which are attached to the outer layers of the annular tabs on the positive and negative end faces.
9. The cylindrical winding core with the full tabs according to claim 8, wherein the annular positive and negative current collecting rings are respectively welded with the annular tabs on the end surfaces of the positive and negative electrodes in an ultrasonic welding mode, a resistance welding mode, an argon arc welding mode and/or a laser welding mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011500212.8A CN112510244A (en) | 2020-12-18 | 2020-12-18 | Electrode lug shaping and welding method of full-electrode-lug cylindrical winding core and full-electrode-lug cylindrical winding core formed by same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011500212.8A CN112510244A (en) | 2020-12-18 | 2020-12-18 | Electrode lug shaping and welding method of full-electrode-lug cylindrical winding core and full-electrode-lug cylindrical winding core formed by same |
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| Publication Number | Publication Date |
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| CN112510244A true CN112510244A (en) | 2021-03-16 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113314763A (en) * | 2021-06-24 | 2021-08-27 | 星恒电源股份有限公司 | Cylindrical battery roll core and manufacturing method thereof |
| CN114122635A (en) * | 2021-07-06 | 2022-03-01 | 江苏时代新能源科技有限公司 | Battery cell, battery, electric device, and method and device for manufacturing battery cell |
| CN114361555A (en) * | 2021-12-31 | 2022-04-15 | 远景动力技术(江苏)有限公司 | Full-tab cylindrical battery flattening method |
| CN114122635B (en) * | 2021-07-06 | 2024-06-07 | 江苏时代新能源科技有限公司 | Battery cell, battery, electric equipment and manufacturing method and equipment of battery cell |
-
2020
- 2020-12-18 CN CN202011500212.8A patent/CN112510244A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113314763A (en) * | 2021-06-24 | 2021-08-27 | 星恒电源股份有限公司 | Cylindrical battery roll core and manufacturing method thereof |
| CN114122635A (en) * | 2021-07-06 | 2022-03-01 | 江苏时代新能源科技有限公司 | Battery cell, battery, electric device, and method and device for manufacturing battery cell |
| CN114122635B (en) * | 2021-07-06 | 2024-06-07 | 江苏时代新能源科技有限公司 | Battery cell, battery, electric equipment and manufacturing method and equipment of battery cell |
| CN114361555A (en) * | 2021-12-31 | 2022-04-15 | 远景动力技术(江苏)有限公司 | Full-tab cylindrical battery flattening method |
| CN114361555B (en) * | 2021-12-31 | 2023-06-16 | 远景动力技术(江苏)有限公司 | Full-lug cylindrical battery flattening method |
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