Quantitative determination method for reversible lithium precipitation of lithium ion battery

A lithium-ion battery, quantitative determination technology, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve the problems of inability to evaluate the severity of lithium precipitation, inability to detect the amount of lithium precipitation, etc., to achieve the effect of non-destructive evaluation

Active Publication Date: 2020-10-13
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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AI Technical Summary

Problems solved by technology

[0004] All of the above detection methods can reflect the lithium deposition inside the lithium-ion battery under non-destructive conditions, but they are all qualitative analysis, but they cannot detect the amount of lithium deposition, and cannot evaluate the severity of lithium deposition.

Method used

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  • Quantitative determination method for reversible lithium precipitation of lithium ion battery
  • Quantitative determination method for reversible lithium precipitation of lithium ion battery

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Experimental program
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Embodiment 1

[0024] S1. Take the lithium-ion battery to be tested after constant capacity. The battery capacity is 1.1Ah. Under the condition of -20°C, first apply a current of 1C to the battery for constant current charging, charge to 50% SOC, and measure the voltage value 3.78V, then apply a voltage of 3.78V to the battery for constant voltage charging to 70% SOC;

[0025] S2. Apply a small current of 1 / 20C to the charged battery for constant current discharge, record the voltage change with time during the discharge period, and obtain the V ~ t curve, such as figure 1 shown;

[0026] S3. Perform second-order differential processing on the V~t curve to obtain the dV / dt~t curve, such as figure 2 As shown, the time to record the inflection point of the curve is 0.24h;

[0027] S4. Calculate the reversible lithium amount of the battery during the charging process, the reversible lithium amount Q=(1.1 / 20)A×0.24h=13.2mAh.

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Abstract

The invention discloses a quantitative determination method for reversible lithium precipitation of a lithium ion battery. The method comprises the following steps: taking the constant-volume lithiumion battery to be measured; firstly, adopting a constant-to-constant-voltage charging mode to perform charging; and then applying a small current with the magnitude of I0 to the battery to carry out constant-current discharge, recording the change of the voltage along with time during discharge, carrying out second-order differential processing on the obtained V-t curve to obtain a dV/dt-t curve,and calculating the reversible lithium precipitation amount of the battery in the charging process according to the inflection point time t0 of the curve. According to the method, nondestructive testing of lithium precipitation of the lithium ion battery can be achieved, the content of reversible lithium precipitation can be quantified, and nondestructive evaluation of the lithium precipitation degree of the lithium ion battery is achieved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery detection, in particular to a quantitative determination method for lithium-ion battery reversible analysis. Background technique [0002] The continuous advancement of power battery technology has enabled the rapid development of the new energy industry. With the advancement of technology and the continuous changes in people's work and life needs, higher requirements are placed on the performance of power batteries. Among them, fast charging has become one of people's expectations for the performance of lithium-ion batteries. However, lithium-ion batteries are prone to lithium precipitation under conditions such as high-rate charging, low-temperature charging, or increased polarization after cycling, and lithium precipitation will accelerate the capacity decay of the battery, increasing the internal resistance of the battery, and lithium dendrites may Piercing the diaphragm causes a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/378G01R31/385
CPCG01R31/378G01R31/385Y02E60/10
Inventor 张震厉运杰陈虎孙言飞王利夏厚勇韩威振
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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