Battery capacity detection method

A detection method and battery capacity technology, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve problems such as energy loss and long test time

Inactive Publication Date: 2014-05-07
优科新能源科技有限公司
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  • Abstract
  • Description
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Problems solved by technology

[0005] However, since the test process of the prior art usually uses a small rate current (generally less than 0.3CNA current), the time for one charge and discharge process is about 6 hours, so the time for three full charges and full discharges is about 18 hours. hours, the test time is too long
In addition, due to the long test time, a large amount of energy loss is caused during the test

Method used

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Embodiment Construction

[0069] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited thereto.

[0070] The invention provides a detection method of battery capacity, the basic principle is as follows:

[0071] polarization amplitude inflection point effect

[0072] Define the charging polarization voltage SOC gradient (that is, the rate of change of polarization voltage with SOC during charging) as:

[0073] L = ∂ V P ∂ soc ,

[0074] Extract the polarization voltage value of the polarization voltage test established by different initial currents, and calculate the change curve of the polarization voltage SOC gradient, see figure 1 . In the time domain, charging under different initial currents, di...

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Abstract

The invention discloses a battery capacity detection method comprising the following steps of: obtaining a charged open-circuit voltage OCV-state of charge SOC curve, and a direct-current inner resistance Romega; and calculating an SOC changing rate and the like. The method disclosed by the invention is mainly used for a battery and is particularly suitable for a capacity test of a power battery pack. Compared with the traditional full-charge and full-discharge test method, the test method disclosed by the invention realizes the aims of shortening battery capacity time and reducing test energy consumption.

Description

technical field [0001] The invention relates to a battery capacity detection method, in particular to a battery capacity detection method based on battery polarization characteristics. Background technique [0002] With the development of power battery material technology and its popularization and application in the field of electric vehicles, the testing of power battery packs is essential in battery applications. Through the testing process of the power battery pack, the comprehensive evaluation of the performance of the battery pack can be completed. At present, the parameters of the battery test include the capacity and internal resistance of the battery. The internal resistance test is often relatively simple, that is, it is obtained by using the voltage change generated by the current to stimulate the battery, while the battery capacity test is more complicated, and because the capacity of a single test may have a certain Therefore, multiple measurements are required...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/36
Inventor 温家鹏于勤录冯韬杨润宇潘天李剑
Owner 优科新能源科技有限公司
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