CN108550896B - Assembling method of full-lug winding cylindrical lithium ion battery - Google Patents
Assembling method of full-lug winding cylindrical lithium ion battery Download PDFInfo
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- CN108550896B CN108550896B CN201810531576.9A CN201810531576A CN108550896B CN 108550896 B CN108550896 B CN 108550896B CN 201810531576 A CN201810531576 A CN 201810531576A CN 108550896 B CN108550896 B CN 108550896B
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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
- H01M10/0404—Machines for assembling batteries
- H01M10/0409—Machines for assembling batteries for cells with wound electrodes
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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
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound 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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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Secondary Cells (AREA)
Abstract
The invention relates to a method for assembling a full-lug winding cylindrical lithium ion battery, which comprises the following steps: a full-tab winding cylindrical lithium ion battery assembling method comprises the following steps: (1) coating; (2) rolling and slitting; (3) winding; (4) kneading and flattening; (5) laser welding; (6) and assembling into a shell. Because the invention does not need to adopt intermittent coating, the invention directly and continuously coats, raise production efficiency, increase the coated area, regulate and raise the capacity of the electric core and energy density; the influence of space occupied by folding the traditional tabs is eliminated, the internal space of the battery is fully utilized, and the energy density is improved; the novel assembly process is simple to operate, high in feasibility and capable of reducing production cost integrally.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to an assembling method of a full-lug winding cylindrical lithium ion battery.
Background
The lithium battery has the advantages of high voltage, large specific energy, long charging and discharging service life, stable discharging performance, low self-discharging rate, no pollution and the like, and is widely applied to the fields of new energy automobiles, energy storage and the like. With the market development, the industry needs and the guidance of national policies, the energy density requirement of the power lithium ion battery is higher and higher. At present, a cylindrical battery mainly adopts an intermittent coating (a coating area, an empty foil area and a coating area), is cut and baked after being rolled, is welded with a positive current collector and a negative current collector in the empty foil area, is wound into a roll core and is assembled into a shell. The traditional process realizes connection through a strip current collector, the current collector is welded on a foil material firstly, and then the other end of the current collector is welded on a cap of a positive electrode and a negative electrode after winding. The process is complex in operation, low in production efficiency, easy to cause welding problems and low in yield. The assembly operation precision requirement is high, and the assembly is difficult.
Disclosure of Invention
The invention aims to overcome the defects and provides the assembling method of the full-lug winding cylindrical lithium ion battery, and the assembling method can be used for directly and continuously coating without adopting intermittent coating, so that the production efficiency is improved, the coating area is increased, and the cell capacity and the energy density are increased; the influence of space occupied by folding the traditional tabs is eliminated, the internal space of the battery is fully utilized, and the energy density is improved; the novel assembly process is simple to operate, high in feasibility and capable of reducing production cost integrally.
The purpose of the invention is realized as follows:
a full-tab winding cylindrical lithium ion battery assembling method comprises the following steps:
(1) coating: continuous coating, wherein the length of the white left at two sides of the coating area can be set according to the requirement;
(2) rolling and slitting;
(3) winding: winding the whole tab, and leaving white foils on two sides of the winding core to form a positive and negative pole left white tab;
(4) kneading and flattening: adopting ultrasonic flattening equipment or other mechanical vibration or kneading modes to flatten the white tab left on the winding core, and forming a welding position after flattening;
(5) laser welding: welding the welding position with the circular current collector by laser;
(6) assembling into a shell: the roll core is put into the shell, and the cover cap is connected with the soft gasket.
Preferably, the flattening step is to flatten both ends of the positive electrode and the negative electrode simultaneously or one by one.
Preferably, the flattening step is to flatten the end faces of the anode and cathode blanks to a certain depth so that the anode and cathode of the winding core are flush with or higher than the diaphragm by a certain distance.
Preferably, a circular clamping groove is formed in the circular current collector to position the soft gasket.
Preferably, the top of the soft gasket is a circular plane, so that the contact area is increased, and the current circulation is facilitated.
Preferably, the welding impression of the laser welding is an intermittent circular welding impression.
Preferably, the pressure of the air cylinders at the two sides in the flattening step is 1-1.5MPa, the power is 400-1500W, and the flattening time is about 2-5 seconds.
Preferably, the pressure applied to the positive electrode in the rolling and slitting step is 130-170T, and the pressure applied to the negative electrode is 100-200T.
Compared with the traditional cylindrical battery assembling process, the assembling method has the following advantages:
1. because intermittent coating and direct continuous coating are not needed, the production efficiency is improved, the coating area is increased, and the capacity and the energy density of the battery cell are increased.
2. The influence of the space occupied by folding the traditional pole lug is eliminated, the internal space of the battery is fully utilized, and the energy density is improved.
3. The continuous coating is adopted to meet the requirement of the roller pressing process, and the material is not easy to break, fold and fall off.
4. The novel assembly process is simple to operate, high in feasibility and capable of reducing production cost integrally.
5. The round soft gasket is arranged inside, current circulation inside the battery is stable, and meanwhile, the shock-resistant effect can be achieved.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is an effect diagram of the flattened core.
Wherein: 1. leaving a white tab on the positive electrode; 2. leaving a white tab on the negative electrode; 3. a winding core; 4. a positive electrode welding position; 5. a housing; 6. a negative current collector; 7. a negative electrode soft gasket; 8. a negative electrode cap; 9. a positive current collector; 10. a positive electrode soft gasket; 11. a positive electrode cap; 12. and a negative electrode welding position.
Detailed Description
Referring to fig. 1-2, a method for assembling a full-tab wound cylindrical lithium ion battery includes the following steps:
(1) coating: continuous coating, wherein the length of the white margins on the two sides of the coating area can be set according to requirements, and a plurality of strip areas can be coated simultaneously;
the coating specification parameters were as follows:
thickness of the foil: copper foil 10 μm and aluminum foil 16 μm;
foil surface density: the copper foil surface is 8.75 +/-0.4 mg/cm, and the aluminum foil surface is 4.32 +/-0.4 mg/cm;
width of the foil: 128mm of copper foil and 124mm of aluminum foil;
coating width: the negative pole is 58mm, and the positive pole is 56 mm;
coating speed: 10 m/min;
weight loss rate: less than 0.2%;
two white spaces are wide: 6 mm.
(2) Rolling and slitting;
the specification parameters of rolling slitting are as follows:
rolling speed: less than 30 m/min;
pressure: anode 130-: 100T;
and (3) positive electrode: 133 ± 2 μm, negative electrode: 158 +/-2 μm;
slitting width: positive electrode material region + foil material: 56mm +6mm, negative electrode material area + foil: 58mm +6 mm;
cutting burrs: less than 10 μm.
(3) Winding: winding the full tab, and arranging white foil materials on two sides of a winding core 3 to form a positive electrode white tab 1 and a negative electrode white tab 2;
(4) kneading and flattening: and flattening the white tabs left on the positive electrode and the negative electrode of the winding core by adopting ultrasonic flattening equipment or other mechanical vibration or kneading modes, wherein the pressure of cylinders on two sides is 1-1.5MPa, the power is 400W, the flattening time is about 2 seconds, the flattening depth is about 6mm, and the positive electrode welding position 4 and the negative electrode welding position 12 are formed after flattening.
(5) Laser welding: after the winding core is fixed, the anode welding position 4 and the cathode welding position 12 are respectively welded with the anode current collector 9 and the cathode current collector 6 in a laser mode, the welding power is about 800W, the anode is welded firstly, and then the cathode is welded; the anode and the cathode can be welded at the same time.
(6) Assembling into a shell: the winding core 3 is placed in the shell 5, the positive electrode soft gasket 10 and the negative electrode soft gasket 7 are respectively placed in the clamping grooves of the positive electrode current collector 9 and the negative electrode current collector 6 for positioning, and the positive electrode cap 11 and the negative electrode cap 8 are respectively connected with the positive electrode soft gasket 10 and the negative electrode soft gasket 7.
And (3) testing results:
first, tension test
And (4) performing tension test after welding the roll core and the circular current collector, wherein the test result is more than 300N and accords with the tension test standard. Testing parameters: the speed is 25 mm/min.
Second, capacity test
The design of the internal winding core is changed, and compared with the traditional process, the capacity is improved by about 9 percent, and the energy density is improved by 5 percent.
Third, welding effect
Roll up core and circular mass flow body welding effect: the materials of the two end faces of the battery cell can be gathered towards the center after being kneaded, the kneading face is smooth, the outward turning condition can not occur, the time is fast, and the efficiency is high.
Four, roll test
Compared with the traditional process, the novel process has the advantages that the rolling process speed is obviously improved, and the pole piece is relatively stable and not easy to deform during rolling.
In addition to the above embodiments, the present invention also includes other embodiments, and any technical solutions formed by equivalent transformation or equivalent replacement should fall within the scope of the claims of the present invention.
Claims (6)
1. The assembling method of the full-lug winding cylindrical lithium ion battery is characterized by comprising the following steps of: the method comprises the following steps:
coating: continuously coating, wherein the length of the white left at two sides of a coating area is set according to the requirement;
rolling and slitting;
winding: winding the whole tab, and leaving white foils on two sides of the winding core to form a positive and negative pole left white tab;
kneading and flattening: adopting ultrasonic flattening equipment or other mechanical vibration or kneading modes to flatten the white tab left on the winding core, and forming a welding position after flattening;
laser welding: welding the welding position with the circular current collector by laser;
assembling into a shell: the winding core is placed in the shell, and the cover cap is connected with the soft gasket;
a circular clamping groove is formed in the upper surface of the circular current collector, and the soft gasket is positioned;
the top of the soft gasket is a circular plane, so that the contact area is increased, and the circulation of current is facilitated.
2. The assembly method of claim 1, wherein the method comprises the following steps: the flattening step is to flatten the two ends of the positive electrode and the negative electrode simultaneously or one by one.
3. The assembly method of claim 1, wherein the method comprises the following steps: and the flattening step is used for flattening the end faces of the left white positive and negative electrodes to a certain depth so that the positive and negative electrodes of the roll core are flush with the diaphragm or are higher than the diaphragm by a certain distance.
4. The assembly method of claim 1, wherein the method comprises the following steps: the welding mark of laser welding is an intermittent circular welding mark.
5. The assembly method of claim 1, wherein the method comprises the following steps: the pressure of the air cylinders at the two sides in the flattening step is 1-1.5MPa, the power is 400-1500W, and the flattening time is 2-5 seconds.
6. The assembly method of claim 1, wherein the method comprises the following steps: in the rolling and slitting step, the applied pressure of the positive electrode is 130-170T, and the applied pressure of the negative electrode is 100-200T.
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| CN108550896B true CN108550896B (en) | 2020-12-29 |
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| CN110600795B (en) * | 2019-08-13 | 2021-09-10 | 合肥国轩高科动力能源有限公司 | Lithium ion cylindrical battery and processing method thereof |
| CN110518184B (en) * | 2019-08-29 | 2020-12-25 | 武汉逸飞激光设备有限公司 | Full utmost point ear electricity core production line |
| CN112510325A (en) * | 2020-10-28 | 2021-03-16 | 天津空间电源科技有限公司 | Cylindrical battery with die-cut tabs and manufacturing process thereof |
| CN112563678A (en) * | 2020-12-14 | 2021-03-26 | 天津市捷威动力工业有限公司 | Lithium ion power soft package battery T-shaped tab and manufacturing method of battery |
| CN113488746A (en) * | 2021-07-06 | 2021-10-08 | 湖北亿纬动力有限公司 | Manufacturing process of multi-tab battery cell and multi-tab battery cell |
| CN113410528A (en) * | 2021-08-04 | 2021-09-17 | 深圳市信宇人科技股份有限公司 | Full-tab lithium battery and packaging preparation process thereof |
| CN114050306A (en) * | 2021-11-10 | 2022-02-15 | 广东科信聚力新能源有限公司 | Lithium battery |
| CN114050326B (en) * | 2021-11-26 | 2023-10-10 | 多氟多新能源科技有限公司 | Processing method of cylindrical lithium ion battery cell tab |
| CN217239697U (en) * | 2022-01-21 | 2022-08-19 | 宁德时代新能源科技股份有限公司 | Battery monomer, battery and power consumption device |
| CN114464467A (en) * | 2022-03-11 | 2022-05-10 | 合盛科技(宁波)有限公司 | Lead type full-lug lithium ion capacitor and preparation method thereof |
| CN115207519B (en) * | 2022-09-15 | 2022-11-22 | 上海汽车集团股份有限公司 | Vehicle power battery and vehicle power battery pack |
| CN115275531B (en) * | 2022-09-26 | 2022-12-09 | 江苏正力新能电池技术有限公司 | Preparation method of multi-tab battery cell and multi-tab battery cell |
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| KR101137369B1 (en) * | 2009-11-17 | 2012-04-20 | 삼성에스디아이 주식회사 | Cylindrical lithium secondary battery |
| CN102751540A (en) * | 2012-07-27 | 2012-10-24 | 山东天阳新能源有限公司 | Manufacturing process of coiled lithium ion power battery |
| KR102249892B1 (en) * | 2014-10-08 | 2021-05-10 | 삼성에스디아이 주식회사 | Rechargeable battery |
| CN204632817U (en) * | 2015-05-26 | 2015-09-09 | 新乡市超力新能源有限公司 | A kind of button battery |
| CN204927432U (en) * | 2015-07-03 | 2015-12-30 | 深圳市慧通天下科技股份有限公司 | Cylindrical lithium ion power batteries |
| CN105742721A (en) * | 2016-04-27 | 2016-07-06 | 国轩新能源（苏州）有限公司 | High-energy-ratio low-internal-resistance cylindrical lithium ion battery |
| CN106410104B (en) * | 2016-08-25 | 2023-03-24 | 合肥国轩高科动力能源有限公司 | Cylindrical multi-tab battery and manufacturing method thereof |
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