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Battery health state detection method

A battery health status and detection method technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems that online estimation cannot be realized and accuracy is difficult to guarantee, and achieve online testing, short time consumption, and high accuracy high effect

Inactive Publication Date: 2014-12-10
绍兴安卡汽车配件有限公司 +1
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  • Application Information

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Problems solved by technology

[0003] At present, the conventional method of judging the state of health (State Of Health, SOH) of the battery is to measure the discharge capacity of the battery in the current state, and determine the state of health of the battery according to the ratio of the discharge capacity to the rated capacity of the battery. The discharge device discharges the battery, this method cannot realize online estimation
In addition to using the discharge capacity method to judge the state of health of the battery, there is also a battery cycle capacity decay model to predict the capacity of the current state of the battery, but the actual use of the battery is often inconsistent with the simulation process, so the accuracy of the prediction is difficult to guarantee

Method used

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  • Battery health state detection method

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Embodiment 1

[0022] A method for detecting the state of health of a battery, comprising the following steps:

[0023] Step 1: Use an AC impedance meter to measure the AC impedance of a new battery in an unused state to obtain the internal resistance of the new battery;

[0024] Step 2: Obtain an old battery that has reached the end of its life after use, and use an AC impedance meter to measure the AC impedance of the old battery to obtain the internal resistance of the old battery;

[0025] Step 3: Use an AC impedance meter to measure the AC impedance of the battery to be tested to obtain the current internal resistance of the battery to be tested;

[0026] Step 4: According to the measured internal resistance of the new battery, the internal resistance of the old battery and the internal resistance of the current state of the battery to be tested, the health of the battery to be tested is obtained by calculation, and then the health of the battery is judged according to the health.

[0...

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Abstract

The invention relates to a battery health state detection method which includes the steps: firstly, measuring the alternating-current impedance of an unused new battery by the aid of an alternating-current impedance meter to obtain the internal resistance of the new battery; secondly, obtaining a used old end-of-life battery and measuring the alternating-current impedance of the old battery by the aid of the alternating-current impedance meter to obtain the internal resistance of the old battery; thirdly, measuring the alternating-current impedance of a battery to be measured by the aid of the alternating-current impedance meter to obtain the current internal resistance of the battery to be measured; fourthly, calculating the health degree of the battery to be measured according to the internal resistance of the new battery, the internal resistance of the old battery and the current internal resistance of the battery to be measured, and further judging the health state of the battery according to the health degree. An alternating-current impedance testing method is simple, short time is consumed, and online testing can be realized. Besides, change of ohmic resistance represents attenuation of battery capacity, and the ohmic resistance and the battery capacity have a corresponding relationship, so that accuracy of the health state of the battery estimated by the method is high.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a battery health state detection method. Background technique [0002] After the battery is used or left alone for a long time, aging effect will occur, that is, the health status of the battery will deteriorate, which is manifested in the decline of the discharge capacity of the battery and the increase of the internal resistance of the battery. Make a correct judgment on the current state of health of the battery, so as to determine whether the battery can meet the requirements of the use conditions and whether it can continue to be used. Timely and accurate understanding of the health status of the battery can facilitate better management of the battery. [0003] At present, the conventional method of judging the state of health (State Of Health, SOH) of the battery is to measure the discharge capacity of the battery in the current state, and determine the state of health o...

Claims

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Application Information

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IPC IPC(8): G01R31/36
Inventor 张波林道松刘丽慧夏文娟
Owner 绍兴安卡汽车配件有限公司
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