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A kind of low temperature charging method of lithium iron phosphate battery

A technology of a lithium iron phosphate battery and a charging method, applied in the field of lithium ion batteries, can solve the problems of charging lithium precipitation, high charging energy, short battery charging time, etc., so as to reduce low-temperature charging time, improve low-temperature performance, and avoid negative electrode lithium precipitation. Effect

Active Publication Date: 2022-04-19
江西安驰新能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a low-temperature charging method for lithium iron phosphate batteries, to solve the problem of lithium deposition at low temperatures, and to make the charging time of the battery short and the charging energy high

Method used

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  • A kind of low temperature charging method of lithium iron phosphate battery

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Embodiment 1

[0025] In the present embodiment, the low-temperature charging method of the lithium iron phosphate battery, the specific steps are as follows:

[0026] (1) Charge to 13% SOC with 0.2C constant current;

[0027] (2) Charge to a voltage of 3.52V with a constant current of 0.8C;

[0028] (3) Charge to 3.65V with 0.2C constant current and constant voltage.

Embodiment 2

[0030] In the present embodiment, the low-temperature charging method of the lithium iron phosphate battery, the specific steps are as follows:

[0031] (1) Charge with 0.3C constant current to 20% SOC state of charge;

[0032] (2) Charge to a voltage of 3.6V with a constant current of 1C;

[0033] (3) Charge to 3.65V with 0.3C constant current and constant voltage.

Embodiment 3

[0035] In the present embodiment, the low-temperature charging method of the lithium iron phosphate battery, the specific steps are as follows:

[0036] (1) Charge with 0.05C constant current to 5% SOC state of charge;

[0037] (2) Charge to a voltage of 3.45V with a constant current of 0.5C;

[0038] (3) Charge to 3.65V with 0.1C constant current and constant voltage.

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Abstract

The invention belongs to the technical field of lithium ion batteries, and in particular relates to a low-temperature charging method for a lithium iron phosphate battery, comprising the following steps: (1) charging the battery with a constant current at a rate of A to an SOC state of charge of N%; Charge the battery with constant current to voltage X at B rate; (3) Charge the battery with constant current and constant voltage to 3.65V at C rate. The invention is suitable for charging the lithium iron phosphate battery when the ambient temperature is low. Under the condition that the original structure of the battery remains unchanged, the effect of improving the low-temperature performance of the battery is achieved by optimizing the low-temperature charging method. By charging the lithium iron phosphate battery in the charging mode of the present invention, while reducing the low-temperature charging time to the greatest extent, it avoids lithium deposition at the negative electrode during the low-temperature charging process.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and particularly relates to a low-temperature charging method of a lithium iron phosphate battery. Background technique [0002] With the promotion and popularization of electric vehicles, more and more power batteries are used in electric vehicles. A typical problem faced by power lithium-ion batteries is that the cruising range in winter is drastically reduced, and the use of lithium batteries in low temperature environments is limited. In addition to the serious decline in discharge capacity, lithium batteries cannot be charged at low temperatures. Although some new energy vehicles will preheat the battery pack before charging in a low temperature environment, there are still problems such as uneven heating of the cells, waste of electric energy and abnormal heating, which lead to vehicle fires. At present, there are many research institutions and battery manufacturers. In resea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/44H01M10/0525
CPCH01M10/443H01M10/0525Y02E60/10
Inventor 郭娜娜何涛斌吴超凡白科孙玉龙陈富源
Owner 江西安驰新能源科技有限公司
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