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A kind of lithium-ion power battery charging method

A power battery and charging method technology, applied in the direction of secondary battery charging/discharging, secondary battery repair/maintenance, etc., can solve problems such as adverse battery capacity, affecting battery life, and increasing battery capacity attenuation, reducing side reactions, Improve service life and reduce polarization effect

Active Publication Date: 2018-03-20
RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Severe battery polarization has a great impact on the consistency of Li+ transmission inside the battery. At the same time, the internal resistance of the process will continue to increase, which is not conducive to the stable performance of the battery capacity. Battery Life

Method used

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  • A kind of lithium-ion power battery charging method
  • A kind of lithium-ion power battery charging method
  • A kind of lithium-ion power battery charging method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The test battery used is an energy type battery, the battery number is 1, the rated capacity of the battery is 90Ah, the ratio of the battery power density to the energy density is 7; the standard current of the battery is 1 / 3C; the theoretical charging upper limit voltage of the battery is 4.2V; The response internal resistance for different currents is 1.33mΩ. The charging method of the present embodiment includes the following steps:

[0041] (1) The initial voltage is 3.0V, and the constant current is charged to 4.2V at a rate of 1 / 3C, and the battery charging capacity-voltage curve is obtained, and the differential capacity curve is obtained by differential processing of the curve, such as figure 1 Shown; the number of complete peaks in the entire charging voltage range n = 3;

[0042](2) Divide the battery charging voltage range into 5 sections (n+2=5), the voltage sections from low to high are 3~3.466V, 3.466~3.666V, 3.666~3.944V, 3.944~4.135V, 4.135V ~4.2V;

...

Embodiment 2

[0046] The test battery used is a power battery, the battery number is 2, the battery rated capacity is 30Ah, the ratio of battery power density to energy density is 14; the battery standard current is 1C; the battery stipulates that the theoretical charging upper limit voltage is 4.2V; The response internal resistance is 1.16mΩ. The charging method of the present embodiment includes the following steps:

[0047] (1) The initial voltage is 3.0V, charged to 4.2V with 1C, and the battery charging capacity-voltage curve is obtained, and the differential capacity curve is obtained by differential processing of the curve, such as figure 2 Shown; the number of complete peaks in the entire charging voltage range n = 1;

[0048] (2) Divide the battery charging voltage range into 3 sections (n+2=3), the voltage sections from low to high are 3~3.591V, 3.591~3.858V, 3.858~4.2V;

[0049] (3) The voltage section is charged in the following way from low to high: the first and second sect...

Embodiment and

[0059] Table 2 embodiment and comparison of cycle performance under comparative example method

[0060]

[0061] By adopting the charging method of the invention, the charging capacity of the battery is not affected, the charging efficiency of the battery is improved, and the service life of the battery is obviously improved at the same time.

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Abstract

The invention provides a charging method of a lithium ion power battery. The method comprises the following steps of (1) carrying out constant-current charging test on the battery with a standard current within a charging limitation voltage range of the battery, obtaining a differential capacity curve according to a charging capacity-voltage curve, and dividing the battery voltage into (n+2) segments according to a peak number n of the curve; and (2) sequentially charging within all the voltage segments, carrying out constant-voltage charging with a finish voltage or entering a next voltage segment for charging or stopping charging after the finish voltage of a current voltage segment is reached, wherein constant-current, constant-voltage or pulse charging can be carried out during charging. The peaks of the differential capacity curve represent different electrochemical reactions of the battery, a peak value represents the minimum internal resistance of the battery during each electrochemical reaction, the charging according to the voltage segments of the battery is carried out according to the peak number of the differential capacity curve, the reaction polarization increase caused by excessive large polarization internal resistance difference of the battery in the charging voltage range due to single-current charging of the battery can be prevented, and the service lifetime of the battery is obviously prolonged on the premise of ensuring the battery capacity.

Description

technical field [0001] The invention relates to the technical field of battery charging, in particular to a lithium-ion power battery charging method for improving battery life. Background technique [0002] With the continuous development of technology and the gradual improvement of the industrial chain, the application of lithium-ion batteries in the field of power continues to expand due to the advantages of high energy density and good rate performance, and has become a type of battery mainly used in the field of electric vehicles. This also puts higher demands on battery life. [0003] The traditional power lithium-ion battery charging method generally adopts the form of constant current and constant voltage charging. In the normal high temperature environment, a larger current charging is used, and in a low temperature environment, a reduced current charging is used, but the current remains unchanged throughout the constant current charging process until After the bat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/44
CPCY02E60/10
Inventor 李群徐金龙吴宁宁孙雯石强
Owner RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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