Self-discharge test method for lithium ion battery

A lithium-ion battery and testing method technology, which is applied in the field of self-discharge testing of lithium-ion batteries, can solve problems such as long medium-discharge time and complicated procedures, and achieve accurate self-discharge conditions and ensure accuracy.

Inactive Publication Date: 2017-12-01
CALB CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the discharge time of the above-mentioned invention patent is long and the process is complicated

Method used

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  • Self-discharge test method for lithium ion battery
  • Self-discharge test method for lithium ion battery
  • Self-discharge test method for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0032] Step S1: Randomly select 5 formed batteries with a rated capacity of 72Ah. First cycle the battery for 8 times. After the cycle is completed, adjust the battery to constant capacity. The cycle conditions are: in the constant capacity workshop (25±2°C) Under normal conditions, the charge-discharge cycle is carried out with a current of 1C; after the cycled battery is left to stand for 3 hours, the volume is constant. Discharge 0.5C to 2.5V, and then use 0.1C to discharge completely, that is to complete the constant volume.

[0033] Step S2: Charge the battery with a constant current of 0.5C to a fully charged state, then transfer the battery to a high-temperature room at 45°C, and store it for 7 days.

[0034] Step S3: Transfer the static battery to the constant volume room. After static for 8 hours, discharge the battery, then fully charge it, and constant volume. Refer to the second step for discharge conditions and constant volume conditions.

[0035] Table 1. Batter...

Embodiment approach 2

[0039] Step S1: Randomly select 5 formed batteries with a rated capacity of 72Ah. First cycle the battery 5 times. After the cycle is completed, constant the capacity of the battery. The cycle conditions are: in the constant capacity workshop (25±2°C) Under normal conditions, the charge-discharge cycle is carried out with a current of 1C; after the cycled battery is left to stand for 3 hours, the volume is constant. Discharge 0.5C to 2.5V, and then use 0.1C to discharge completely, that is to complete the constant volume.

[0040] Step S2: Charge the battery with a constant current of 0.1C to a fully charged state, then transfer the battery to a high temperature room at 45°C, and store it for 10 days.

[0041] Step S3: Transfer the static battery to the constant volume room. After static for 8 hours, discharge the battery, then fully charge it, and constant volume. Refer to the second step for discharge conditions and constant volume conditions.

[0042] Table 2. Battery self...

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Abstract

The invention relates to the technical field of lithium battery test, and particularly relates to a self-discharge test method for a lithium ion battery. The method comprises the following steps of S1, carrying out several times of charge and discharge circulation on a lithium-ion battery, and carrying out the volume metering test on the lithium-ion battery; S2, charging the lithium-ion battery which has been already subjected to charging and discharging pretreatment to a full-electricity state, and standing the lithium-ion battery at a high-temperature environment of 35-50 DEG C for 1-10 days; S3, cooling the lithium-ion battery after the standing treatment, metering the volume of the lithium-ion battery again, and determining the self-discharge condition of the lithium-ion battery according to two volume metering results. By adopting the above method, the temperature of 35-50 DEG C is adopted as a high-temperature standing temperature based on the results of a large number of experimental tests. Therefore, the performance of the lithium-ion battery can be optimized, and the experiment testing time can be greatly shortened.

Description

technical field [0001] The invention relates to the technical field of lithium battery testing, in particular to a lithium ion battery self-discharge testing method. Background technique [0002] With the development of the electric vehicle industry, since lithium iron phosphate batteries have better safety performance and longer life than other lithium-ion batteries, it has become a trend for lithium iron phosphate batteries to be used in electric vehicles. [0003] When the storage battery and primary battery are not connected to the external circuit, the loss of battery capacity caused by the internal white hair reaction is generally called self-discharge. Expressed by the percentage of capacity lost per year or per month, for example, the self-discharge of various lithium-ion batteries is very small, 1-2% per month, and the metal hydride is relatively large, reaching more than 10% per month. Due to the uncertainty of the production process and the uncontrollability of v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCG01R31/378G01R31/392G01R31/396
Inventor 王云辉樊彦良孙青山王红领李景凯
Owner CALB CO LTD
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