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Lithium ion battery aging evaluation method

A lithium-ion battery and battery technology, which is applied in the field of lithium-ion battery aging assessment, can solve problems such as inconsistency with the actual use of power batteries, and achieve the effect of extending battery life

Active Publication Date: 2021-02-12
WANXIANG 123 CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The battery life prediction method of the invention studies the calendar aging and cycle aging separately, but the cycle life attenuation is obtained by continuously charging and discharging the battery, which does not conform to the actual use of the power battery

Method used

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  • Lithium ion battery aging evaluation method
  • Lithium ion battery aging evaluation method
  • Lithium ion battery aging evaluation method

Examples

Experimental program
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Embodiment

[0046] A method for evaluating the aging of lithium-ion batteries, comprising the following steps:

[0047] (1) Divide 30 lithium-ion batteries of the same specification with an initial SOC of 100% into two groups, the number of batteries in the calendar aging test group (denoted as group #1) and the comprehensive aging test group are 6 and 24 respectively, Aging tests were respectively carried out at 55°C.

[0048] (2) Calendar aging test group: the batteries in this group were left for 210 days.

[0049] (3) Comprehensive aging test group: divide this group of batteries into 4 groups (respectively denoted as groups #2 to #5), each group contains 6 batteries. according to Figures 2 to 5 The 4 cycle conditions shown are respectively periodically charged and discharged for 4 groups of batteries, and the cycle lasts for 210 days. in, figure 2 Curve 1 in the figure indicates that the battery is fully charged at the end of each day with constant voltage and constant current,...

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Abstract

The invention relates to the technical field of lithium ion batteries, and discloses a lithium ion battery aging evaluation method. The method comprises the following steps: dividing a plurality of same lithium ion batteries of which the initial SOC is 100% into two groups, and carrying out an aging test at the same temperature, wherein the calendar aging test group stands for N days, the comprehensive aging test group performs periodic charging and discharging, the cycle condition of each cycle is designed according to the actual use condition of the battery, and the cycle is continued for Ndays; carrying out capacity testing once every M days; respectively calculating the capacity attenuation rates delta[Q] calendar and delta[Q] total of the calendar aging test group and the comprehensive aging test group; and subtracting the delta[Q] calendar from the delta[Q] total to obtain a cyclic aging capacity attenuation rate delta[Q] cycle. According to the evaluation method, calendar agingand cyclic aging can be separately researched, cyclic aging adopts a cyclic working condition which is more practical, an analysis result is more practical, and the evaluation method can be used forestimating the service life of the lithium ion battery, researching an aging mechanism and selecting an optimal operation condition.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for evaluating the aging of lithium ion batteries. Background technique [0002] Lithium-ion battery is currently the most potential energy source for hybrid electric vehicles and pure electric vehicles. Its performance directly affects the performance of the vehicle, and its price and life are the most important factors affecting the economy of electric vehicles. Although lithium-ion batteries can meet the requirements of electric vehicles in terms of power, energy and capacity, they also have obvious advantages in terms of safety and environmental protection compared with other types of batteries. However, the contradiction between the limited service life of lithium-ion batteries and the high replacement cost has become the bottleneck of lithium-ion battery technology, which in turn limits the large-scale promotion of electric vehicles. The main reasons...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/392G01R31/387
CPCG01R31/392G01R31/387Y02E60/10
Inventor 宫娇娇资小林许梦清高明霞
Owner WANXIANG 123 CO LTD
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