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.

CN104062594AActive Publication Date: 2014-09-24ZHEJIANG CHAOWEI CHUANGYUAN INDUSTRAIAL
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2014-09-24

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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.
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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...

Examples

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 ...