A method for estimating soh of emergency lead-acid battery in power station
A technology of lead-acid batteries and power stations, which is applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve the problems of lack of emergency lead-acid battery SOH estimation methods, etc., achieve high estimation accuracy, reduce time length, and facilitate implementation
Active Publication Date: 2022-02-11
HANGZHOU ANMAISHENG INTELLIGENT TECH CO LTD
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Problems solved by technology
[0005] The technical problem to be solved by the present invention is: lack of technical problems suitable for emergency lead-acid battery SOH estimation method at present
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Embodiment 1
[0022] A method for estimating the SOH of an emergency lead-acid battery in a power station, such as figure 1 As shown, it includes the following steps: A) From time t1, carry out the nuclear capacity test according to the standard discharge mode, until the end of time t2, the duration of the nuclear capacity test is shorter than the complete nuclear capacity test time, record each single battery from Discharge curve C from time t1 to time t2. Use standard discharge modes, such as C20, C10, C5, etc., to carry out nuclear capacity tests on the battery pack. The full discharge time of the battery is recorded as tf. The monitored quantities in the nuclear capacity test include the battery pack current, the total voltage of the battery pack and the voltage of the single battery, and the sampling interval is 5s. Record the discharge curve C of each single battery from time t1 to time t2 after the discharge starts, such as 20 to 45 minutes, and the discharge curve C is the time
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The invention relates to the technical field of battery management, in particular to a method for estimating the SOH of an emergency lead-acid battery in a power station. A) Conduct a short-term nuclear capacity test and record the discharge curve; B) Obtain the reference curve; C) preset the zoom range; D) scale the reference curve D within the zoom range; E) at α i Intercept a segment on D, add a linear component to the segment to obtain a fitting segment C' i , obtained such that the fitting fragment C' i The linear component with the shortest distance to discharge curve C, and record the shortest distance; F) discharge curve α i D plus the linear component corresponding to the minimum value of the shortest distance, as the final predicted discharge curve D', calculate the SOH of each single battery; G) the minimum value of SOH of the single battery, as the SOH of the battery. The invention has the beneficial effects of reducing the time required for SOH estimation, convenient implementation, not being limited to specific model parameters, strong generalization ability, and adapting to the mixed battery models in the power station.
Description
technical field [0001] The invention relates to the technical field of battery management, in particular to a method for estimating the SOH of an emergency lead-acid battery in a power station. Background technique [0002] The SOH (State of Health) of a lead-acid battery is an important indicator of the state of health of the battery. Due to the complex physical and chemical processes of the battery itself, its operation law is difficult to describe directly through the mechanism. The current mainstream estimation methods include experience-based methods, such as cycle number method, ampere-time method, weighted ampere-hour method, and aging accumulation method, as well as performance-based methods, such as mechanism method, feature fitting method, and data-driven method. But these estimation methods have the problem of time-consuming. [0003] The emergency lead-acid battery of the power station is used for uninterrupted power supply of the equipment after a sudden power ...
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IPC IPC(8): G01R31/379G01R31/367G01R31/385
CPCG01R31/379G01R31/367G01R31/385
Inventor 杨雨杜方程胜
Owner HANGZHOU ANMAISHENG INTELLIGENT TECH CO LTD