Lithium-ion power battery matching method

A power battery and lithium-ion technology, which is applied in the field of battery selection and matching, can solve the problems of small differences in single cells, inability to accurately reflect the differences in battery cells, and battery life that cannot meet the standard.

Active Publication Date: 2014-09-24
ZHEJIANG CHAOWEI CHUANGYUAN INDUSTRAIAL
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0006] The invention solves the defect that there are differences among the single cells of the same battery pack, which causes the service life of the battery pack to fail to meet the standard, and provides a lithium-ion power battery matching method. The elevator cells with the same performance are screened to form a group. Ensure that the difference between the single cells of the same battery pack is small, so that the service life of the battery pack reaches the standard
[0007] The present invention also solves the defect that the existing test method cannot accurately reflect the difference between the single cells of the battery pack, and provides a lithium-ion power battery matching method, through charge and discharge tests, aging tests, dynamic and static data tests, Accurately reflect the differences between single cells, and screen out single cells with the same performance to form a battery pack

Method used

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Examples

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Embodiment

[0029] Embodiment: A kind of lithium-ion power battery matching method (see attached figure 1 ), (1) Take an appropriate number of cells to be tested from the same batch or different batches, conduct charge and discharge tests on the cells to be tested, and record the state of charge parameters of each cell to be tested, according to the state of charge parameters For the first grouping, the batteries to be tested with the same state of charge parameters are merged into a group to form the first ladder system, specifically: move the batteries to be tested to the capacity dividing device and connect them, and use a constant current at a rate of 0.5C Discharge to the lower limit protection voltage, so that the charge capacity of the battery under test is 0%, and ensure that the state of charge parameters of the battery under test are consistent at this time, and then stop charging at a constant current of 0.5C for 60 minutes, and screen the battery under test. Divide those with ...

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Abstract

The invention relates to a lithium-ion power battery matching method and aims at overcoming the defect that the service life of a battery pack is not up to standard due to difference between individual cells of the same battery pack. A stepwise screening method is adopted, and a charge / discharge test, an aging test, a dynamic data test and a static data test are performed on cells to be tested so that the individual cells consistent with each other in properties are screened out to complete matching; the test of each step is capable of picking out the cells to be tested inconsistent in test objectives and remaining the ells to be tested consistent in the test objectives; the battery pack matched successfully at last has the up-to-standard service life.

Description

technical field [0001] The invention relates to a battery matching method, in particular to a lithium ion power battery matching method, by which electrochemically consistent power batteries can be selected to improve the actual service life of the battery pack. Background technique [0002] Lithium battery (Lithium Cell) refers to the most basic electrochemical unit containing lithium (including metal lithium, lithium alloy, lithium ion, lithium polymer) in the electrochemical system. Lithium batteries can be roughly divided into two categories: lithium metal batteries and lithium ion batteries. Li-ion batteries do not contain metallic lithium and are rechargeable. Lithium-ion batteries are generally batteries that use lithium alloy metal oxides as positive electrode materials, graphite as negative electrode materials, and non-aqueous electrolytes. [0003] At present, as a new type of energy, lithium-ion batteries have significant advantages over traditional lead-acid ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36H01M10/42
CPCY02E60/10
Inventor 刘启凯孙延先宋泽斌王玉龙吴抗
Owner ZHEJIANG CHAOWEI CHUANGYUAN INDUSTRAIAL
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