On-line Monitoring Method of Battery Internal Resistance Based on Combination Filtering Algorithm
A combined filter and battery technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of not meeting the accuracy requirements, to overcome the influence, filter out the interference of high-frequency noise and transient pulse, and improve the accuracy Effect
Active Publication Date: 2021-06-25
山东正晨科技股份有限公司
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[0040] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0041] Such as figure 1 As shown, the battery internal resistance online monitoring circuit diagram of the present invention is given. The lead-acid battery shown is the battery to be tested for internal resistance. The AC excitation signal generator is used to inject AC sinusoidal signals to both ends of the battery, and the AC excitation signal generates There is a comparison sampling resistor R connected in series between the device and the battery 1 , the equivalent resistance of the line between the AC excitation signal generator and the storage battery is R 2 . While the AC excitation signal is injected, the AC response signal collected from both ends of the battery is f bsw1 (n), the AC response signal collected from both ends of the comparison sampling resistor is f dsw2 (n). Since the internal resistance of the storage battery is usually i...
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The battery internal resistance online monitoring method based on the combined filter algorithm of the present invention firstly collects the AC response signals at both ends of the battery and the comparison resistor, then determines the scaling range of the structural element scale, and uses the scaling range of the structural element to perform an open- The multi-scale alternating hybrid filtering of the closed operation is performed, and then the wavelet decomposition is performed, and then the soft and hard compromise threshold filtering is performed, and finally the internal resistance of the battery is calculated by the comparison method. The battery internal resistance online monitoring method of the present invention uses the mathematical morphology alternate hybrid filter method to filter out the transient pulse noise component in the AC response signal, and uses the wavelet threshold noise reduction algorithm to extract the characteristic quantity of the approximate signal, which not only filters out the AC response The high-frequency noise in the signal and the interference of transient pulses overcome the influence of line resistance on the detection results, and significantly improve the accuracy of online measurement of battery internal resistance by AC injection method.
Description
technical field [0001] The present invention relates to an on-line monitoring method for battery internal resistance based on a combined filter algorithm, more specifically, to an on-line battery internal resistance monitoring method based on a combined filter algorithm that is suitable for UPS power batteries and electric vehicle power batteries in the field of green buildings method. Background technique [0002] At present, the evaluation of battery health status generally takes the change of battery internal resistance as an important basis for its capacity and remaining life. When the internal resistance value is 20% higher than the standard internal resistance value and its capacity is less than 80% of the rated capacity, it can generally be judged as a battery. failure and the battery needs to be replaced immediately to ensure the normal operation of the DC power supply system. [0003] At present, the internal resistance detection generally adopts the DC instantaneo...
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IPC IPC(8): G01R31/367G01R31/389
CPCG01R31/367G01R31/389
Inventor 刘林丁笑迎杨元浩官晓鹏王康张溱旼
Owner 山东正晨科技股份有限公司