Method for estimating state of health of lead-carbon batteries based on weighted accumulation of discharge capacity
A battery state of health, lead-carbon battery technology, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve the problems of battery internal resistance, energy state error, large health state error, etc., and achieve the effect of improving estimation accuracy
Active Publication Date: 2020-12-29
NORTHEAST DIANLI UNIVERSITY
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Problems solved by technology
The internal resistance and energy state of the battery obtained by estimating the parameters of the battery model have a certain error, and the error of the state of health obtained by the internal resistance or energy state is even greater
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Embodiment 1
[0040]According to lead-carbon battery cycle life NN(Times) and depth of discharge DODNRelationship(figure 1 As shown), the following relational expression can be obtained:
[0041]NN=0.07135DODN2-25.26DODN+2063 (6)
[0042]S5. Substituting formula (6) into formula (1), and finding its derivative, making the derivative equal to zero, the maximum total discharge capacity Ctotalmax Equal to 98020Ah, corresponding to 933 cycles;
[0043]S6, record the single discharge capacity of the battery CdisN And depth of discharge DODN,Calculate the number of discharges N according to the depth of discharge, and calculate C according to formula (2)totalmax With CtotalN Ratio KN,According to formula (4) to obtain the converted capacity CdisNmax , Accumulate the converted capacity to get the converted total discharge capacity ∑CdisNmax , Finally, calculate the battery health status SOH according to formula (5).
[0044]In order to verify the correctness and effectiveness of the method proposed in the present i...
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The invention discloses a lead-carbon battery health state estimation method based on discharge capacity weighted accumulation. According to the method, the discharge quantity corresponding to each discharge depth DOD is converted to a maximum discharge amount, and the SOH of a battery according to the accumulated result of the discharge amount after conversion is estimated. The capacity of the battery with a maximum total discharge capacity CTTAMAX is obtained. When the battery has the maximum total discharge capacity CTTAMAX, the health state of the battery is 100%. The health state of the battery based on the electric quantity accumulation is defined as follows: (img file = 'DSA 00001727247000011.TIF 'wi = '664 'he = '123 '). In the formula, the Ctotmax is the maximum total discharge capacity of the battery, and Sigma CdisNmax is the historical total discharge capacity. The data used in the method are obtained through measurement. The generation of SOH estimated result errors, due to the errors of battery internal resistance and energy state obtained during the estimation through battery model parameters and caused during the SOH estimation process according to the internal resistance of the battery and the energy state of the battery can be effectively prevented. The SOH estimation accuracy is improved.
Description
Technical field[0001]The invention relates to the field of electrical engineering, in particular to a method for estimating the health status of a lead-carbon battery based on the weighted accumulation of discharge capacity.Background technique[0002]The state of health (SOH) of lead-carbon batteries reflects the degree of deviation of the current performance of the battery from the factory nominal index, is an important reference data for the working condition of the battery and the remaining working life, and is an important indicator of the performance of the battery. How to accurately detect the battery health status is a key issue for battery users.[0003]There are currently many estimation methods and definitions for battery SOH, and different SOH estimation methods have different definitions, but the estimation results and definitions are all to reflect the health of the battery. The current proposed methods include: defining SOH with battery internal resistance, which converts...
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IPC IPC(8): G01R31/367G01R31/392
Inventor 段双明严干贵朱微李洪波刘彦宇刘莹蔡长兴
Owner NORTHEAST DIANLI UNIVERSITY