Formation method of lithium ion battery

A technology of lithium-ion batteries and formation methods, which is applied in the field of formation of lithium-ion batteries, can solve problems such as hindering electrode reactions, increasing internal resistance of batteries, and affecting battery performance, so as to reduce internal resistance of batteries and improve flatness , the effect of improving efficiency

Inactive Publication Date: 2016-11-16
ZHUHAI COSMX BATTERY CO LTD
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Problems solved by technology

If these gases cannot be removed in time and enter the interior of the cell, it will increase the inte

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  • Formation method of lithium ion battery
  • Formation method of lithium ion battery
  • Formation method of lithium ion battery

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Embodiment Construction

[0021] In order to make the above and other objects, features and advantages of the present invention more apparent, the following specifically cites the embodiments of the present invention, together with the accompanying drawings, for a detailed description as follows.

[0022] The basic idea of ​​the method of the present invention is: put the aging cell into high-temperature pressurized forming equipment for charging, then cool the cell at room temperature under a certain pressure, and put the cell down to normal temperature into a vacuum environment , puncture the airbag bag, pump air, and then seal it. The sealed cell is put into the high-temperature pressurized forming equipment for charging again, and finally it is cooled at room temperature under a certain pressure until the cell drops to room temperature and the formation is completed. .

[0023] The above is the core idea of ​​the present invention. The technical solutions of the embodiments of the present invention...

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Abstract

A formation method of a lithium ion battery comprises the following steps of placing a battery cell of which aging is finished in a device for high-temperature pressurized formation, wherein the charging cutoff voltage is 3.5-3.8V; cooling the battery cell under a room temperature and a fixed pressure to make the temperature of the battery cell reduced to a room temperature; placing the cooled battery cell in a vacuum environment, puncturing an air bag of the battery cell, pumping air, and sealing; placing the battery cell of which air pumping is finished in a formation device for high-temperature pressurized formation, wherein the charging cutoff voltage is 3.9-4.5V; and cooling the battery cell under a room temperature and a fixed pressure to make the temperature of the battery cell reduced to the room temperature, and finishing formation. According to the formation method, the steps of puncturing the air bag and pumping air are added during hot-press formation, reaction gas can be timely eliminated, and thus, the internal resistance of the battery cell is effectively reduced; and with the two steps of high-pressure room-temperature cooling, the hardness of the lithium battery can be improved, the flatness of the battery cell is improved, and the performance of the lithium battery is improved.

Description

technical field [0001] The invention belongs to the technical field of manufacturing lithium ion batteries, and in particular relates to a formation method of lithium ion batteries. Background technique [0002] Lithium-ion batteries must go through a formation process during the production process. Through the formation process, the positive and negative electrode materials are activated to form an SEI film that is critical to the performance of lithium batteries, thereby improving the electrochemical performance of the battery. There are two main formation methods at present: one is to conduct formation at room temperature with a small current, which can fully guarantee the performance of lithium batteries, but the formation time is relatively long, and the relatively short time takes more than ten hours. , some even for a few days, seriously delaying the production schedule, low production efficiency, resulting in high production costs: the other is high-temperature and h...

Claims

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Application Information

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IPC IPC(8): H01M10/44H01M10/058
CPCH01M10/058H01M10/446Y02E60/10Y02P70/50
Inventor 李俊义徐延铭黄福帅
Owner ZHUHAI COSMX BATTERY CO LTD
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