Lithium ion battery with low manufacturing cost and long cycle life and manufacturing method thereof
A lithium-ion battery, cycle life technology, applied in the field of lithium-ion batteries, can solve problems such as not being able to fully meet the cost, and achieve the effects of reducing the number of battery cell stacks, improving the rate performance, and low cost
Inactive Publication Date: 2020-06-26
LONG POWER SYST NANTONG CO LTD
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Problems solved by technology
With the gradual maturity and stability of related manufacturing technology, traditional technology has encountered bottlenecks in the performance improvement of lithium-ion batteries, especially the manufacture of power lithium-ion batteries, which can no longer fully meet its requirements for cost, specific energy, specific power, and cycle life. and low internal resistance requirements
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[0029] Manufacturing method of lithium-ion battery with low manufacturing cost and long cycle life:
[0030] 1) Preparation of positive electrode collector:
[0031] The conventionally used aluminum foil is punched to form an aluminum mesh, and special attention should be paid to the smoothness of the edge of the punched hole without burrs; then, a layer of conductive paste is evenly coated on both sides of the aluminum mesh, and the thickness of the coating is controlled within 0.5-6um. After drying at 80°C for 2 hours under vacuum conditions, the positive electrode current collector can be obtained. The preparation process of the conductive paste used above is based on SUPPER-P, which is mixed with H2O and PAA evenly to obtain the required conductive paste.
[0032] 2) Preparation of porous positive electrode sheet:
[0033] The cathode material uses nano-scale LiFePO 4 For powder, PVDF-HFP is used as binder, SP-Carbon is used as conductive agent, and DBP is used as plast...
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Abstract
The invention relates to a lithium ion battery with low manufacturing cost and long cycle life and a manufacturing method of the lithium ion battery. The manufacturing method comprises the steps of preparing positive and negative current collectors, preparing positive and negative plates, preparing a special diaphragm and manufacturing the lithium ion battery with low manufacturing cost and long cycle life. Ultra-thick positive and negative porous plates are prepared, and meanwhile, carbon-coated aluminum and copper-based current collector nets and a coating porous structure are adopted, so that an electrode obtains electrochemical properties such as high energy density, high rate and long cycle life. On the other hand, due to the use of a new process, the material, manpower, electric power and equipment costs in the battery cell manufacturing process are greatly reduced. A battery cell manufactured by the method is excellent in performance, and the characteristics of 4C charging and 10C discharging are realized at normal temperature when the battery cell is assembled on a pure electric passenger vehicle body in a matched mode. The cycle life of the system reaches 8000 times, the endurance mileage of a one-time pure electric mode is 520 kilometers, and the highest vehicle speed is 176 kilometers / hour.
Description
technical field [0001] The technical field of the lithium ion battery of the present invention particularly relates to a lithium ion battery with low manufacturing cost and long cycle life and a manufacturing method thereof. Background technique [0002] With the advancement of science and technology, the demand for environmental protection, and compared with Ni-H and Ni-Cr batteries, lithium-ion batteries have no memory effect, higher energy density, and longer life. These factors have made lithium-ion batteries gain popularity. widely used. [0003] The current process for large-scale manufacturing of lithium-ion batteries mainly includes the following processes: preparation of electrode slurry, coating and drying, sheet production, electrode sheet baking, positive / negative electrode sheet and separator combined winding or lamination to form a battery cell , Baking liquid injection, formation and volume separation of dry cells. Among them, in the coating process of elect...
Claims
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IPC IPC(8): H01M4/66H01M4/74H01M4/136H01M4/1397H01M10/0525H01M10/0585
CPCH01M4/136H01M4/1397H01M4/663H01M4/667H01M4/745H01M10/0525H01M10/0585H01M2004/028Y02E60/10Y02P70/50
Inventor黄耀泽黄碧英萨多威.R.唐纳德
OwnerLONG POWER SYST NANTONG CO LTD