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Lithium-ion battery rapid charging method capable of preventing lithium separation

A lithium-ion battery, fast charging technology, applied in secondary battery charging/discharging, secondary battery repair/maintenance, etc., can solve problems affecting battery safety and cycle life, increasing charging current, etc., so as not to affect charging , the effect of fast charging

Active Publication Date: 2016-11-09
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, increasing the charging current may affect the safety and cycle life of the battery

Method used

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  • Lithium-ion battery rapid charging method capable of preventing lithium separation
  • Lithium-ion battery rapid charging method capable of preventing lithium separation
  • Lithium-ion battery rapid charging method capable of preventing lithium separation

Examples

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Effect test

Embodiment 1

[0045] In the present embodiment, the lithium-ion battery fast charging method comprises the following steps:

[0046] Step 1: Use the thermal-electrochemical model of lithium-ion batteries to obtain the initial state of charge of a certain battery when charging at different temperatures and different charging currents, that is, the boundary of the state of charge of lithium analysis.

[0047]The condition used to determine the lithium analysis boundary is that the difference between the solid phase potential and the liquid phase potential at the interface between the negative electrode of the lithium ion battery and the separator is equal to the lithium analysis reaction potential.

[0048]

[0049] Table 1

[0050] As shown in Table 1, taking -10°C as an example, when the battery is charged at 2.6C to 12% SOC, lithium precipitation begins to occur; when charged at 1.3C to 69% SOC, lithium precipitation begins to occur; It can be charged to a fully charged state without l...

Embodiment 2

[0057] Step 1: Use the thermal-electrochemical model of lithium-ion batteries to obtain the maximum charging current that does not trigger lithium analysis for a certain battery at different temperatures and states of charge, that is, the lithium-ion charging current boundary.

[0058] image 3 It is a schematic diagram of the lithium charging current boundary of the second embodiment of the present invention. Such as image 3 As shown, when using the thermal-electrochemical model of lithium-ion batteries to determine the boundary conditions for lithium analysis, the judgment condition adopted is that the difference between the solid-phase potential and the liquid-phase potential at the interface between the negative electrode of the lithium-ion battery and the separator is equal to the lithium-ion reaction potential. From image 3 It can be seen that the boundary of lithium analysis current increases with the increase of battery temperature and decreases with the increase o...

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Abstract

The invention discloses a lithium-ion battery rapid charging method capable of preventing lithium separation. The lithium-ion battery rapid charging method comprises the following steps: obtaining a lithium separation boundary when a lithium-ion battery is charged; according to the lithium separation boundary, setting a charging current rule of the lithium-ion battery; in the charging current rule, controlling charging current so that lithium separation of the lithium-ion battery does not occur; and charging the lithium-ion battery according to the charging current rule. The lithium-ion battery rapid charging method capable of preventing the lithium separation has the advantages that the charging current rule of the lithium-ion battery is set according to the lithium separation boundary when the lithium-ion battery is charged, safe and rapid charging is realized and the cycle life of the battery is not influenced.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a lithium-ion battery fast charging method capable of preventing lithium precipitation. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, low self-discharge rate, and no memory effect. energy storage elements. However, the charging speed of lithium-ion batteries is slow, and the usual charging procedure requires several hours of charging time, which brings inconvenience to the use of pure electric vehicles, mobile phones, etc. In order to increase the charging speed of lithium-ion batteries, fast charging methods have gradually attracted people's attention. [0003] In order to charge more electricity in a shorter time, the fast charging method of lithium-ion battery still needs to increase the charging current at all. However, increasing the charging current may affect the safety and cycle life of the battery. ...

Claims

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Application Information

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IPC IPC(8): H01M10/44
CPCH01M10/44Y02E60/10
Inventor 张剑波李哲葛昊
Owner TSINGHUA UNIV
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