Lithium supplementation method for soft pack lithium ion battery and preparation method of lithium ion battery
A lithium-ion battery and ion battery technology, applied in the field of lithium-ion batteries, can solve the problems of low energy density, heavy battery weight, waste of resources, etc., achieve high energy density, improve utilization rate, and avoid waste
Active Publication Date: 2020-06-26
SOUNDON NEW ENERGY TECH CO LTD
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Problems solved by technology
[0004] The first object of the present invention is to provide a method for replenishing lithium in a soft-packed lithium-ion battery, so as to alleviate the technical problems of heavy battery weight, low energy density and waste of resources caused by the lithium replenishment method in the prior art
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[0047] as attached figure 1 As shown, the present embodiment is an intermediate supplementary lithium battery for a lithium ion battery, including a battery cell and an aluminum-plastic film for packaging the battery cell. The battery cell includes a positive electrode 1 and a negative electrode 2. After encapsulation, an air bag 4 is formed on one side edge of the aluminum-plastic film, and the metal lithium used as the lithium-replenishing electrode 3 is sealed in the air bag 4 . Wherein, the outer tab of the lithium-supplementing electrode 3 is an aluminum sheet.
[0048] After the liquid injection is completed, the lithium-supplementing electrode 3 is placed in the air bag 4, and an external circuit is led through the aluminum foil. Next, the negative electrode 2 and the lithium-replenishing electrode 3 are respectively connected to an external circuit, and the battery is discharged. During the discharge process, a part of lithium in the lithium supplementary electrode 3...
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Abstract
The invention provides a method for replenishing lithium in a soft-pack lithium-ion battery, a preparation method for the lithium-ion battery and an intermediate lithium-replenishing battery, and relates to the field of lithium-ion batteries. The method for replenishing lithium in a soft pack lithium ion battery comprises the following steps: A) before the soft pack battery is formed, the lithium replenishing electrode is placed in an air bag containing electrolyte formed after the cell is packaged; The negative electrode is electrically connected to the lithium-replenishing electrode, and it is discharged so that the lithium in the lithium-replenishing electrode migrates to the negative electrode, thereby realizing lithium replenishing; C) then cutting and removing the air pocket and the lithium electrode. The lithium supplementation method can alleviate the technical problems of heavy battery weight, low energy density and waste of resources caused by the lithium supplementation method in the prior art, and achieves the technical effect of increasing the energy density of the battery.
Description
technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a lithium-replenishing method for a soft-pack lithium-ion battery, a preparation method for the lithium-ion battery, and an intermediate lithium-replenishing battery. Background technique [0002] Lithium-ion batteries are mainly composed of positive electrode materials, negative electrode materials, electrolyte, separator and other auxiliary materials. The specific capacity of positive and negative electrode materials directly determines the energy density of the battery. The theoretical specific capacity of graphite as the anode material of lithium-ion batteries is 372mAh / g, and the currently applicable commercial graphite has exceeded 360mAh / g, which is very close to its theoretical value, and there is no obvious room for improvement. To further increase the energy density of batteries, new anode materials must be used. Li can be formed when silicon is alloyed w...
Claims
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IPC IPC(8): H01M10/44H01M10/42H01M10/0525H01M10/058
CPCH01M10/0525H01M10/058H01M10/42H01M10/44Y02E60/10Y02P70/50
Inventor 唐其伟苗力孝朱坤磊徐艳红
Owner SOUNDON NEW ENERGY TECH CO LTD