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Charging optimization method of lithium ion battery

A technology of lithium ion battery and optimization method, applied in the field of lithium ion battery, can solve problems such as capacity loss, and achieve the effect of reducing charging time, easy to implement, and prolonging service life

Active Publication Date: 2018-05-11
UNIV OF SCI & TECH OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing technologies only focus on one aspect, that is, reducing the charging time and prolonging the service life. How to achieve both purposes at the same time is still a difficult problem
Furthermore, improvements over existing charging methods are often accompanied by a loss of capacity

Method used

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  • Charging optimization method of lithium ion battery
  • Charging optimization method of lithium ion battery
  • Charging optimization method of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Use the first stage constant current charging rate 0.6C (1.2A), the fourth stage constant current charging rate 0.1C (0.2A), constant voltage charging time 0min; the first stage constant current charging rate 0.6C (1.2A), the second Four-stage constant current charging rate 0.3C (0.6A), constant voltage charging time 0min; first stage constant current charging rate 0.8C (1.6A), fourth stage constant current charging rate 0.1C (0.2A), constant voltage charging Time 0min; standard charging rate constant current and constant voltage charging to charge the lithium-ion battery respectively. The lithium-ion battery has a positive electrode of ternary material and a negative electrode of graphite. The rated capacity is 2Ah, and the standard charging rate is 0.5C (1A). The charging results of the four charging methods for lithium-ion batteries are as follows: Figure 4 , 5 , 6, and 7. In each figure, the curve ① represents the charging rate, the curve ② represents the chargin...

Embodiment 2

[0065] Use the first stage constant current charging rate 0.6C (1.2A), the fourth stage constant current charging rate 0.1C (0.2A), constant voltage charging time 0min; use the first stage constant current charging rate 0.6C (1.2A), The fourth stage constant current charging rate is 0.3C (0.6A), constant voltage charging time is 0min; the first stage constant current charging rate is 0.8C (1.6A), the fourth stage constant current charging rate is 0.1C (0.2A), constant voltage Charging time 0min; standard charging rate constant current constant voltage; use the first stage constant current charging rate 0.6C (1.2A), the fourth stage constant current charging rate 0.1C (0.2A), constant voltage charging time 5min; use the first stage Six charging methods are used to charge the lithium-ion battery, the lithium-ion battery has a positive electrode of three Material, the negative electrode is graphite, the rated capacity is 2Ah, and the standard charging rate is 0.5C (1A). The char...

Embodiment 3

[0067] Use the constant current charging rate of 0.6C (1.2A) in the first stage, the constant current charging rate of 0.2C (0.4A) in the fourth stage, and the constant voltage charging time of 5 minutes; the standard constant current and constant voltage is used to charge the lithium-ion battery. The positive electrode of the battery is a ternary material, the negative electrode is graphite, the rated capacity is 2Ah, and the standard charging rate is 0.5C (1A). The charging time of the former is 6452s, the charging time of the latter is 8888s, the charging SOC of the former is 98.28%, and the charging SOC of the latter is 100.14%. The SOC is obtained by dividing the actual charging capacity of the lithium-ion battery by the rated capacity. Here the SOC is greater than 100%, indicating that the charging capacity is greater than the rated capacity. Both capacity decay curves are as Figure 10 As shown, curve ① is the battery capacity decay curve of standard constant current a...

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Abstract

The invention proposes a charging optimization method of a lithium ion battery, and belongs to the technical field of a lithium ion battery. The charging optimization method comprises the following steps of performing constant-current charging on the lithium ion battery by employing first-stage charging rate; performing constant-current charging on the lithium ion battery by employing second-stagecharging rate when the voltage reaches a charging cutoff voltage of the lithium ion battery; performing similarly until constant-current charging of a fourth stage is performed; and employing short-time constant-voltage charging when the voltage reaches the charging cutoff voltage of the lithium ion battery, and stopping charging when the constant-voltage charging time reaches preset time. With the charging optimization method proposed by the invention, the charging time can be reduced, the capacity loss is reduced, the service lifetime of the battery is prolonged, and the circuit is easy toimplement.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a charging optimization method for lithium ion batteries. Background technique [0002] The use of fossil energy has aggravated environmental pollution. At the same time, fossil energy will be exhausted and it will be very difficult to form again. Lithium-ion batteries have the advantages of high energy density, good cycle performance, small self-discharge effect, and less pollution. As a carrier of new energy such as hydropower, wind power, and solar power, it can solve problems such as fossil energy shortages and environmental pollution. At present, lithium-ion batteries have been used in many fields such as mobile phones, computers, and electric vehicles. However, there are still many problems to be solved during the use of lithium-ion batteries, among which reducing charging time and prolonging service life are two important aspects. It is a good ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44H01M10/0525
CPCH01M10/0525H01M10/44Y02E60/10
Inventor 王青松刘家龙罗志民段强领邵立勇孙金华刘彩秋李国辉曹克楠王玉坤
Owner UNIV OF SCI & TECH OF CHINA
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