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A kind of method for supplementing lithium of lithium ion battery

A lithium-ion battery and lithium-ion technology, applied in the field of lithium-ion batteries, can solve problems such as potential safety hazards and dead lithium

Active Publication Date: 2021-05-14
湖南庆胜新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing methods of lithium supplementation using metal lithium do not consider the precise use of metal lithium to supplement lithium ions, but directly attach metal lithium to the negative electrode and wait for oxidation to lithium ions. This will cause a lot of dead lithium, and the effect is similar to that of lithium dendrites. Quite, even pose a safety hazard

Method used

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  • A kind of method for supplementing lithium of lithium ion battery

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Embodiment 1

[0017] A method for replenishing lithium in a lithium ion battery, the specific steps of the method for replenishing lithium in a lithium ion battery are as follows:

[0018] S1: Determination of chemical process parameters, the following steps:

[0019] (1) Sampling and discharging from different degrees of formation during the formation process, measuring the reversible power to determine the amount of lithium ions, and calculating the proportion of lithium ions consumed by the SEI to the total formation power;

[0020] (2) Using the proportion of SEI with different formation degrees in the total amount, it is converted into the proportion of the current generated by the SEI film in the total current;

[0021] (3) Draw the total current curve and the corresponding SEI film formation current curve during the formation process;

[0022] (4) Use the three curves of total formation current, SEI film current, and negative electrode current as the control parameters of the format...

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PUM

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Abstract

The invention discloses a method for replenishing lithium in a lithium-ion battery. Sampling and discharging are carried out at different degrees of formation in the formation process, and the reversible electric quantity is measured to determine the quantity of lithium ions, and the ratio of lithium ions consumed by SEI to the total electric quantity of formation is calculated; different formation degrees are used The ratio of SEI to the total amount is converted into the ratio of SEI film generation current to the total current; draw the total current curve and the corresponding SEI film generation current curve during the formation process; use the three curves of the total formation current, SEI film current, and negative electrode current as the formation process control parameter. The present invention uses the third lithium metal electrode for lithium supplementation to achieve precise supplementation. Avoid the formation of dead lithium and eliminate potential safety hazards.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for replenishing lithium in lithium ion batteries. Background technique [0002] Lithium-ion batteries have developed rapidly since their inception, and have become the key development target of rechargeable batteries. With the implementation of my country's "Energy Saving and New Energy Vehicle Industry Development Plan" and the promotion of energy storage and other new energy industries, the demand for power and energy storage lithium-ion batteries will increase significantly. Lithium-ion batteries are mainly composed of positive electrodes, negative electrodes, diaphragms, electrolytes, casings, tabs, etc. Before lithium ions are re-formed, they are all stored in positive electrode active materials and electrolytes as ion conductors. Formation is the first charging of the battery cell after the battery is filled with liquid, activating the active materi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058H01M10/0525
CPCH01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 王世强宁予潘世林李世明阎全忠
Owner 湖南庆胜新能源科技有限公司
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