Method for detecting consistency of single batteries

A single battery and detection method technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve problems such as battery inconsistency that is not considered, and achieve the effects of small impact, simple operation, and low cost

Inactive Publication Date: 2015-06-24
BEIJING BORGWARD AUTOMOBILE CO LTD
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Problems solved by technology

At present, the consistency of the single battery is mainly judged according to the internal resistance, voltage difference and capacity difference of the single battery, so as to classify and select. Some people have proposed some characteristics of observing the battery charge and discharge curve to evaluate the consistency of the battery, but none Account for inconsistencies in cells as their operating temperature changes

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  • Method for detecting consistency of single batteries
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Embodiment Construction

[0019] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0020] The consistency of the single cells in the battery pack is directly related to the performance and life of the battery pack. How to ensure the consistency of each single cell in the battery pack is the key to ensuring the performance of the battery pack. At present, the industry mainly conducts consistency detection based on the characteristics of the internal resistance, voltage difference and capacity of the single battery. However, after the battery works under the same conditions for a period of time, the performance of the battery itself will change greatly. , internal resistance, and charge-discharge curves are no longer converging, resulting in a s...

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Abstract

The invention discloses a method for detecting consistency of single batteries. The method comprises the steps that the qualified single batteries are discharged, the actual battery capacity of the single batteries is detected, and the single batteries are graded according to the capacity difference standard; ohmic resistance testing and polarization resistance testing in high-temperature and low-temperature work areas are carried out on the single batteries of the same grade, and the single batteries are graded according to the difference standard of the tested battery resistance values; a battery unit is formed by selecting the single batteries of the same grade. The work characteristics of lithium ion batteries in the high-temperature area and the low-temperature area are considered comprehensively, the consistency of the batteries can be distinguished more directly, and therefore damage caused by inconsistency of the batteries to the battery set is reduced, and the service life of the battery set is prolonged.

Description

technical field [0001] The invention relates to the field of battery detection, in particular to a method for detecting the consistency of a single battery. Background technique [0002] As we all know, the consistency of the single cells in the battery pack is directly related to the performance and life of the battery pack. How to ensure the consistency of each single cell in the battery pack is the key to ensuring the performance of the battery pack, especially lithium-ion batteries. Bottlenecks for successful application in the field. At present, external circuits are generally used to manage and balance the charging and discharging states of the single cells in the battery pack, so as to improve the consistency of the batteries. However, it is of great significance for the production of battery packs to select single cells with consistent performance indicators to form a battery pack. At present, the consistency of the single battery is mainly judged according to the ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 乔贞美张君鸿张会平任晓玲吴生先姚经文李志华曹远敏
Owner BEIJING BORGWARD AUTOMOBILE CO LTD
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