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Method for secondary selection of self-discharge battery

A battery and battery capacity technology, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve problems such as waste of production capacity, loss, waste of resources, etc.

Pending Publication Date: 2022-05-13
JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are some defects in the existing battery self-discharge selection method, for example, it is easy to select out the battery with a large chemical self-discharge and a slightly high voltage drop. This part of the battery is mainly caused by polarization or the delay in the formation of SEI stability, and the performance is not as good as the good battery. No difference, mistakenly downgrading a good product to a defective product will cause losses; or the battery will be selected for multiple cycles of discharge, wasting production capacity and causing a waste of resources

Method used

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  • Method for secondary selection of self-discharge battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Charge the battery with bad self-discharge settlement to 4.2V with 0.3C constant current and constant voltage, cut-off current 0.05C, then discharge at 0.5C constant current to 2.75V, cycle for 5 weeks, then charge at 0.5C for 60min, and let it stand for 24h The post-test voltage is V3. After the voltage test is completed, store at room temperature for 7 days and measure the voltage again to be V4, and then use △V 2 =V3-V4 to obtain the mean value and standard deviation for settlement. The comparison test was done at the same period, the process was consistent, and the batteries were selected according to the pressure drop gradient to be stored and disassembled respectively. The results are shown in Table 1.

[0052] Table 1 Pressure drop data results

[0053] battery number 1# 2# 3# 4# 5# 6# 7# 8# 9# 10# One-time selection voltage drop / mV 5.8 6.2 6.2 6.4 6.8 7.2 7.3 8.0 5.2 5.3 Secondary selection pressure drop / mV 4.0 4.8 6.2...

Embodiment 2

[0055] Charge the battery with bad self-discharge settlement to 4.2V with 0.5C constant current and constant voltage, cut-off current 0.05C, then discharge to 2.75V with 1C constant current, cycle for 3 weeks, then charge with 1C for 42min, and test after standing for 24h The voltage is V3. After the voltage test is completed, store at room temperature for 5 days and measure the voltage again to be V4, and then use △V 2 =V3-V4 to obtain the mean value and standard deviation for settlement. The comparison test was done at the same period, and the process was consistent. The batteries were selected according to the pressure drop gradient and stored and disassembled respectively. The results are shown in Table 2.

[0056] Table 2 Pressure drop data results

[0057] battery number 1# 2# 3# 4# 5# 6# 7# 8# 9# 10# One-time selection voltage drop / mV 6.2 6.5 6.9 7.3 7.6 8.0 8.3 8.8 4.8 5.0 Secondary selection pressure drop / mV 8.3 4.9 5.0 4.8...

Embodiment 3

[0059] Charge the battery with bad self-discharge settlement to 4.2V with 0.5C constant current and constant voltage, cut-off current 0.05C, then discharge to 2.75V with 1C constant current, cycle for 6 weeks, then charge at 0.8C for 45min, and let it stand for 24h The measured voltage is V3, and after the voltage test is completed, store at room temperature for 3 days and measure the voltage again as V4, and then use △V 2 =V3-V4 to obtain the mean value and standard deviation for settlement. The comparison test was done at the same period, and the process was consistent. The batteries were selected according to the pressure drop gradient and stored and disassembled respectively. The results are shown in Table 3.

[0060] Table 3 Pressure drop data results

[0061] battery number 1# 2# 3# 4# 5# 6# 7# 8# 9# 10# One-time selection voltage drop / mV 5.8 6.2 6.7 7.2 7.6 8.2 8.8 9.4 4.4 4.8 Secondary selection pressure drop / mV 5.1 4.9 8.7 ...

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Abstract

The invention provides a secondary selection method for a self-discharge battery, and relates to the technical field of lithium ion batteries, and the method comprises the following steps: selecting a battery with qualified formation voltage in normal-temperature full-electricity formation of the battery; standing the selected battery under a preset condition; measuring the voltage V1 of the battery; after standing at normal temperature, testing the voltage V2 of the battery; according to V1 = V1-V2, selecting batteries exceeding the preselected range of V1 as batteries with poor voltage drop; charging the battery to a preset charge state after the battery with poor voltage drop is circularly charged and discharged for multiple times under a preset condition; standing the battery and then measuring the voltage V3; standing the battery at normal temperature and then measuring voltage V4; and selecting the battery in the pre-selected range of V2 as a good product according to V2 = V3-V4. On the premise that the primary self-discharge settlement standard is strict, secondary self-discharge selection is carried out on the batteries with poor voltage drop, especially the batteries with the voltage drop close to the upper limit of good products, the selection accuracy of the primary good batteries is guaranteed, the risk of poor voltage drop in later matching is reduced, and customer complaints are reduced.

Description

technical field [0001] The present application relates to the technical field of lithium-ion batteries, in particular to a method for secondary selection of self-discharging batteries. Background technique [0002] Lithium-ion batteries are widely used due to their high energy density, long cycle life, and no memory effect. Especially with the improvement of environmental protection requirements, lithium-ion batteries are widely used in new energy vehicles. In the car module, batteries are combined in series and parallel. Therefore, the consistency of batteries is very high. The criteria for judging consistency mainly include internal resistance, capacity, voltage and self-discharge rate. The so-called self-discharge rate is also commonly referred to as the K value, which is the voltage drop rate of the battery under storage conditions at a certain temperature and for a certain period of time. If there is a large self-discharge voltage drop of a single battery in the same ...

Claims

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Application Information

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IPC IPC(8): G01R31/382G01R31/392
CPCG01R31/382G01R31/392
Inventor 张国帅朱金保
Owner JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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