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Battery self-discharge rapid screening method

A self-discharge and battery technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as low efficiency and long screening cycle, and achieve the effects of improving efficiency, shortening safety, and ensuring accuracy

Pending Publication Date: 2021-10-08
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention lies in the method for self-discharging fast screening of square lithium-ion batteries in the prior art, the screening period is long, and the problem of low efficiency

Method used

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  • Battery self-discharge rapid screening method

Examples

Experimental program
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Embodiment 1

[0027] Such as figure 1 Shown, a kind of method for quick screening of battery self-discharge, described method comprises:

[0028] S1: After the battery is formed, the first OCV test is performed on the battery, and the test voltage is recorded as V1; the cut-off state of the battery formation is not lower than 50% SOC, and the SOC represents the state of charge of the battery.

[0029] S2: Let the battery stand at the preset temperature for the first preset time, conduct the second OCV test on the battery, record the test voltage as V2, and record the absolute value V21 of the difference between V2 and V1, and the difference V21 exceeds The battery removal in the first preset range, the first preset range is slightly different according to the battery model, so the first preset range is designed according to actual needs; specifically: put the battery at temperature T for x days, where x ≥1, T≥45°C, the preferred range of x is 1-3 days, and the preferred range of T is 45°C-...

Embodiment 2

[0035] Embodiment 2 of the present invention is based on Embodiment 1, and provides a specific application example. Select a ternary 55Ah battery cell, form a cut-off state of 50% SOC, select 16 cells, conduct the first OCV test on the battery, and record the voltage V1, then put the battery in a high-temperature storage at 45°C for 2 days. After the battery cools down, conduct a second OCV test on the battery, record the voltage V2, calculate and record the difference V21 between the two voltage tests, and then place the battery on the DCR test cabinet Perform high-current discharge, set the current to 2C (55Ah batteries are used, so each C is 55A, and 2C is 110A), the discharge time is 10s, and the recorded voltage is V3 after the discharge. After the test, the battery is placed at room temperature (25°C ) After standing for 2 hours, conduct the third OCV test on the battery, record the voltage as V4, and calculate the difference V14 between the voltages of V1 and V4 at the s...

Embodiment 3

[0044] Embodiment 3 of the present invention is based on Embodiment 1, and provides another specific application example. Select a ternary 55Ah battery cell, form a cut-off state of 50% SOC, select 32 cells, conduct an OCV test on the battery, and record the voltage V1. Then put the battery in a high-temperature storage at 60°C for 1 day. After the battery is cooled, conduct a second OCV test on the battery, record the voltage V2, calculate and record the difference V21 between the two voltage tests, and then place the battery on the DCR test cabinet for large-scale testing. Current discharge, the current setting is 3C (55Ah batteries are used, so each C is 55A, 3C is 165A), the discharge time is 5s, and the recorded voltage is V3 after the discharge is completed. After the test is completed, the battery is placed at room temperature (25°C) After standing for 2 hours, carry out the third OCV test on the battery, record the voltage as V4, and calculate the voltage difference bet...

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Abstract

The invention discloses a battery self-discharge rapid screening method, which comprises the following steps: forming a battery, carrying out first OCV test on the battery, and recording the test voltage as V1; standing the battery at a preset temperature for a first preset time, carrying out a second OCV test on the battery, recording the test voltage as V2, recording an absolute value V21 of a difference value between V2 and V1, and rejecting the battery with the difference value V21 exceeding a first preset range; discharging the battery for a second preset time; and when discharging of the batteries is finished, recording the voltage as V3, placing the batteries at normal temperature for a third preset time, recording the voltage as V4, recording the absolute value V14 of the difference value between V1 and V4, and removing the batteries with the difference value V14 larger than a second preset range. The method has the advantages that the battery screening time is shortened, and the efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, and more specifically relates to a method for rapid screening of battery self-discharge. Background technique [0002] As a new energy battery, lithium battery has the advantages of high working voltage, high specific capacity, long charge and discharge life, and no memory effect. Lithium batteries have gradually become the mainstream energy source chosen by people, so the demand for lithium batteries is getting higher and higher; [0003] The so-called self-discharge of the battery refers to the battery with a certain amount of power. After being stored at a certain temperature for a period of time, it will lose part of its capacity. That is to say, self-discharge is the capacity loss of the battery when it is not in use. The decline is mainly due to the internal micro-short circuit caused by the presence of metal particles, dust or burrs on the edge of the pole piece inside the b...

Claims

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Application Information

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IPC IPC(8): G01R31/387
CPCG01R31/387
Inventor 钟玉翔
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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