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A method and system for evaluating the consistency of lithium-ion batteries

A technology of lithium ion battery and evaluation method is applied in the field of consistency evaluation of lithium ion battery, which can solve the problems of increasing the cost of single battery consistency testing, not suitable for single battery consistency testing, and high price.

Active Publication Date: 2021-04-09
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Although this method is simple, it requires high-current charging and discharging equipment. The equipment occupies a large area and is expensive, which increases the cost of single battery consistency testing, and is not suitable for large-scale single battery consistency testing.

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  • A method and system for evaluating the consistency of lithium-ion batteries
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  • A method and system for evaluating the consistency of lithium-ion batteries

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Embodiment Construction

[0047] In order to further illustrate the features of the present invention, please refer to the following detailed description and accompanying drawings of the present invention. The accompanying drawings are for reference and description only, and are not intended to limit the protection scope of the present invention.

[0048] Such as figure 1 As shown, this embodiment discloses a method for evaluating the consistency of lithium-ion batteries, including the following steps S101 to S103:

[0049] S101. Perform chemical composition and capacity processing on a plurality of lithium-ion batteries with the same nominal capacity to obtain lithium-ion batteries after preliminary classification;

[0050] S102. Perform an AC impedance spectroscopy test at low temperature on the lithium-ion batteries after the preliminary classification, and obtain the charge transfer impedance of the lithium-ion batteries after the preliminary classification;

[0051] S103. According to the magnit...

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Abstract

The invention discloses a lithium-ion battery consistency evaluation method and system, belonging to the technical field of power battery detection, including carrying out chemical composition and capacity processing on a plurality of lithium-ion batteries with the same nominal capacity, and obtaining lithium batteries after preliminary classification. Ion battery; carry out AC impedance spectrum test under the low temperature to the lithium ion battery after preliminary classification, obtain the charge transfer impedance of the lithium ion battery after this preliminary classification; According to the size of charge transfer impedance, after described preliminary classification Consistency evaluation of lithium-ion batteries. The invention increases the AC impedance test of the battery at low temperature to improve the problem that the battery has good consistency in electrical performance at room temperature but poor consistency at low temperature, so as to realize reasonable matching of batteries and ensure battery The group has excellent performance at low temperature and normal temperature charge and discharge.

Description

technical field [0001] The invention relates to the technical field of power battery detection, in particular to a method for evaluating the consistency of lithium-ion batteries. Background technique [0002] Lithium-ion batteries have been successfully used in electric road vehicles due to their high specific energy, high specific power, long service life, and wide operating range. Lithium-ion batteries for electric road vehicles usually need to combine multiple small-capacity, low-voltage single cells in parallel or in series to form a high-capacity, high-voltage battery pack. As we all know, the consistency of each single battery in the battery pack is the key to maintaining the performance of the battery pack, and its quality is directly related to the performance and life of the battery pack. [0003] In the battery industry, there are generally two methods for detecting the consistency of each single battery: one is to classify by detecting the static data of the capa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/42H01M10/48H01M10/0525G01R31/385G01R31/392
CPCG01R31/3644H01M10/0525H01M10/4207H01M10/482Y02E60/10
Inventor 姚丹彭文李亚金
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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