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Lithium battery charging method considering aging

A charging method and lithium battery technology, applied in secondary battery charging/discharging, secondary battery, secondary battery repair/maintenance, etc., can solve problems such as excessive charging temperature rise, accelerated battery aging, safety accidents, etc., to achieve Lower battery temperature, less heat generation, universal applicability effect

Active Publication Date: 2019-12-31
NANJING UNIV OF SCI & TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a lithium battery charging method considering aging, which solves the problem of rapid charging temperature rise caused by the increase of internal resistance after aging of the battery, and the acceleration of battery aging and safety hazard caused by over-temperature in the charging process. Accidents and other issues

Method used

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  • Lithium battery charging method considering aging
  • Lithium battery charging method considering aging
  • Lithium battery charging method considering aging

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Embodiment

[0076] Select a number of battery cells for parallel tests. First, perform a standard cycle charge and discharge according to the manual provided by the manufacturer. After full charging with constant current and constant voltage, discharge with a constant current at a rate of 0.5C (1.3A) to the lower limit cut-off voltage of 2.75V, and then use 1 / 20C (0.13A) rate constant current charge to the upper limit cut-off voltage 4.2V, complete the ICA test, such as figure 1 As shown, the specific process is as follows.

[0077] Step 1, the battery cell is first discharged at a constant current of 0.5C rate to the lower limit cut-off voltage of the battery;

[0078] Step 2, let stand for 2 hours;

[0079] Step 3, charge with a constant current at a rate of 1 / 20C to the upper limit cut-off voltage of the battery;

[0080] Step 4, according to the corresponding relationship between the charging capacity and the charging voltage, calculate the dQ / dV of the capacity change with the volt...

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Abstract

The invention discloses a lithium battery charging method considering aging. The method comprises two parts of recognition of battery aging status and optimization of a charging curve. The battery aging status is acquired by identifying the ICA curve. The full life cycle model of batteries of the same model is used to acquire the battery parameters of the current aging status of the batteries. Thecharging time and the battery temperature rise are calculated by building a battery model. The charging time and the temperature change are calculated. Finally, with the goal of minimizing the overall battery charging time and minimizing the charging temperature change, the charging curve of the battery in the current aging status is optimized. The temperature rise of batteries is minimized underthe premise that the charging time is as short as possible. The method provided by the invention is suitable for battery cells and groups of electric vehicles, energy storage systems, and electric tools.

Description

technical field [0001] The invention relates to the technical field of battery aging state identification and charging curve optimization, in particular to a lithium battery charging method considering aging. Background technique [0002] Due to the constraints of lithium battery charging and discharging, calendar aging and other factors, aging will inevitably occur. For lithium batteries, the internal aging of the battery directly leads to a decrease in the chargeable and discharge capacity of the battery, accompanied by an increase in the internal resistance of the battery. The reduction of battery capacity directly leads to the reduction of the energy provided by the battery; the increase of the internal resistance of the battery directly leads to the increase of heat generation of the battery, which further aggravates the aging of the battery. In extreme cases, it may even cause safety problems due to excessive heat generation. As a result, aging batteries create more ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44G01R31/367G01R31/389G01R31/392
CPCG01R31/367G01R31/389G01R31/392H01M10/44H01M10/446Y02E60/10
Inventor 马乾孙金磊刘瑞航唐传雨王天如
Owner NANJING UNIV OF SCI & TECH
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