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Formation process for reducing self-discharging rate of lithium ion battery

A lithium-ion battery, self-discharge rate technology, applied in the direction of secondary battery charging/discharging, non-aqueous electrolyte storage battery, electrolyte storage battery manufacturing, etc., can solve the requirements of reducing the battery self-discharging ratio, reducing the service life of the battery pack, and battery consistency high level question

Inactive Publication Date: 2015-03-25
JIANGSU TENPOWER LITHIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The consistency of the battery is very high, and the self-discharge of the battery is a fatal flaw in the consistency of the battery. The self-discharge of the battery directly reduces the service life of the battery pack. Therefore, it is necessary to improve the formation process to reduce the self-discharge ratio of the battery.

Method used

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  • Formation process for reducing self-discharging rate of lithium ion battery
  • Formation process for reducing self-discharging rate of lithium ion battery
  • Formation process for reducing self-discharging rate of lithium ion battery

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Embodiment Construction

[0017] Below in conjunction with accompanying drawing and embodiment the invention is described in detail:

[0018] The invention designs a formation process that can reduce the accumulation of single metals in the formation of lithium-ion batteries, and can greatly reduce the self-discharge ratio of batteries after use.

[0019] The chemical conversion process of the present invention has as follows:

[0020] The lithium-ion battery to be formed is first charged with a short time and low current (20-40min, 50-200mA) to make the battery cell reach a voltage that can corrode the positive metal (except Li), and then store the battery cell at a high temperature of 45 degrees Celsius After 12 to 36 hours in the environment, all the elemental metal impurities in the positive electrode are slowly oxidized, and then diffuse to the surroundings and migrate to the surface of the negative electrode through multiple channels to precipitate, reducing the proportion of the positive metal e...

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Abstract

The invention provides a formation process for reducing self-discharging rate of a lithium ion battery. The process comprises the following steps: step 1: firstly, charging a lithium ion battery to be formed to ensure that a battery cell reaches voltage that positive electrode elementary substance metals can be corroded except for Li; step 2: storing the battery cell under a high temperature environment for a while to ensure that impurities of all elementary substance metals of the positive electrode can be totally and slowly oxidized and diffuse to surrounding branch multi-channels and migrate to negative electrode surfaces for precipitation so that the proportion caused by migrating the metal elementary substances of the positive electrode to the negative electrode surfaces for precipitation and stacking to cause piercing of a membrane is reduced; and step 3: charging to be full according to 0.2 C to reduce the self-charging rate of the lithium ion battery. According to the process, a stacking formation process of forming the lithium ion battery into metal elementary substances can be reduced, and the self-discharging proportion of the battery can be greatly reduced after the battery is used.

Description

technical field [0001] The invention relates to a battery formation process, and is particularly suitable for a formation process for reducing the self-discharge rate of lithium-ion batteries. [0002] Background technique [0003] Lithium batteries have the characteristics of high specific energy, low self-discharge rate, good high and low temperature performance, long charge and discharge life, and no memory effect. At present, it is widely used in notebook computers, video cameras, digital cameras, personal digital assistants (PDA), mobile communication terminal products and electric tools and other products. Cylindrical 18650 lithium-ion secondary batteries with high rate performance are widely used in electric bicycles, electric vehicles, power tools, backup power supplies for mining safety warehouses, etc., and are in huge demand. The consistency of the battery is very high, and the self-discharge of the battery is a fatal flaw in the consistency of the battery. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/44
CPCH01M10/058Y02E60/10Y02P70/50
Inventor 侯峰黄满湘张波
Owner JIANGSU TENPOWER LITHIUM