A rapid estimation method for the actual capacity of decommissioned lithium-ion batteries in electric vehicles

A lithium-ion battery and actual capacity technology, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve the problems of low efficiency, long time consumption, high cost, etc., and achieve the effect of improving estimation efficiency and reducing estimation cost

Active Publication Date: 2021-10-22
SHANDONG UNIV OF SCI & TECH
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  • Application Information

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Problems solved by technology

[0004] Aiming at the problems of long time-consuming, low efficiency and high cost in existing methods for detecting the capacity of decommissioned lithium-ion batteries, the present invention provides a method for quickly estimating the actual capacity of decommissioned lithium-ion batteries for electric vehicles

Method used

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  • A rapid estimation method for the actual capacity of decommissioned lithium-ion batteries in electric vehicles
  • A rapid estimation method for the actual capacity of decommissioned lithium-ion batteries in electric vehicles
  • A rapid estimation method for the actual capacity of decommissioned lithium-ion batteries in electric vehicles

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Experimental program
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Embodiment 1

[0041] Three typical 18650 ternary lithium-ion batteries (N=3) that were decommissioned from a certain electric vehicle were selected, and the nominal capacity of the single lithium-ion battery is 3.2Ah.

[0042] combine figure 1 and figure 2 , the estimation method for these three batteries is as follows:

[0043]Step a: 3 single lithium-ion batteries (N=3) are connected in parallel to form a parallel battery pack, the current of each single lithium-ion battery is detected by a current Hall sensor, and the charging and discharging current is provided by a general-purpose charging and discharging device;

[0044] The actual capacities of the three single lithium-ion batteries are denoted as C 1x 、C 2x 、C 3x .

[0045] Step b: Put the battery pack in parallel for 1 hour, charge with a constant current at a current of 2.8A (0.29NC=0.29×3×3.2A) until the cut-off voltage of the battery is 4.2V, and then charge with a constant voltage until the charging current drops It is 0...

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Abstract

The present invention provides a method for quickly estimating the actual capacity of decommissioned lithium-ion batteries of electric vehicles. By connecting a plurality of decommissioned lithium-ion single batteries in parallel to form a battery pack, the current distribution of each single lithium-ion battery is obtained during constant current discharge. Through measurement and analysis, it is found that in the middle of the constant current discharge of the battery pack, that is, the SOC of the battery pack is about 20%-80%, the ratio of the average current value of each single lithium-ion battery is approximately equal to the actual value of each single lithium-ion battery. Therefore, this relationship can be used to quickly estimate the actual capacity of single decommissioned batteries, improve the efficiency of decommissioned lithium-ion battery capacity estimation, and reduce the estimated cost, which is of great significance to the reuse of decommissioned lithium-ion batteries.

Description

technical field [0001] The invention relates to the field of estimating the actual capacity of a decommissioned lithium-ion battery, in particular to a method for quickly estimating the actual capacity of a decommissioned lithium-ion battery of an electric vehicle. Background technique [0002] With the intensification of energy crisis and environmental pollution, transportation energy transformation is imperative. Electric vehicles using green and environmentally friendly lithium-ion batteries as power sources can effectively reduce road emissions, and are highly valued by domestic and foreign automobile research institutions and manufacturers. However, the cost of the power battery pack is high, and when its capacity decays to 70-80% of the rated capacity, the battery pack will be decommissioned. Although the decommissioned battery pack cannot meet the needs of electric vehicles, its capacity can fully meet the use of energy storage equipment, and still has great reuse va...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/387G01R31/396
CPCG01R31/387G01R31/396
Inventor 常龙栾春晓王宇沈潇王增国刘常永肖林京于志豪
Owner SHANDONG UNIV OF SCI & TECH
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