A current drift correction method, system and device for a battery management system
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A battery management system and drift correction technology, applied in measurement devices, measurement of current/voltage, measurement of electricity, etc., can solve problems such as poor robustness and poor compatibility, and achieve low cost, good robustness, and good compatibility. sexual effect
Active Publication Date: 2020-08-07
GUANGZHOU HKUST FOK YING TUNG RES INST
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[0003] The existing drift correction technology mainly uses open-loop sampling method to correct the drift of the current sensor, or corrects the drift of the current sensor at zero current. not good
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Embodiment 1
[0091] refer to figure 2 , this embodiment uses the current drift correction method of the present invention to estimate the remaining power of the lithium iron phosphate battery, which specifically includes the following steps:
[0092] A. Obtain the drift current of the current sensor at different temperatures offline;
[0093] B. Obtain the battery model of the battery to be used offline;
[0094] C. Online identification of drift current;
[0095] D. Battery SOC estimation based on current integration method.
[0096] The step A can be specifically subdivided into the following steps:
[0097] A1. Obtain the measurement results MI when the current sensor measures different currents at different temperatures T;
[0098] A2. Perform numerical fitting on the result MI of step A1 and the real value RI to obtain a fitting relationship f() between the two, and the fitting relationship f() can be expressed as: RI=f(MI,T);
[0099] A3. Calculate the measured current I of the...
Embodiment 2
[0130] This embodiment uses a method similar to that of embodiment 1 to estimate the remaining power of the lithium iron phosphate battery. The main differences between it and embodiment 1 are the following three points:
[0131] 1) In the present embodiment, the expression of fitting relation f () in step A2 is:
[0133] Wherein, ΔT represents the difference between the current temperature sensor temperature and 0 degrees Celsius, namely: ΔT=(T-0). In actual use, T is generally greater than 0 degrees Celsius.
[0134] 2) The expression of the battery model fitted in step B1 in this embodiment is:
[0136] Among them, U oc is the open circuit voltage of the battery, β 0 , β 1 , β 2 , β 3 , β 4 and beta 5 Both are battery model parameters, which can be preset or given.
[0137] 3) In this e...
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Abstract
The invention discloses a current drift correction method, system and device for a battery management system. The method includes the following steps that: temperature drift correction is performed onthe measurement result of a current sensor to obtain temperature drift-corrected current; a battery model is established, the voltage residual of the voltage of the battery model and the actual measured voltage of a battery is calculated; the drift current of the current sensor is calculated according to the calculated voltage residual; and the temperature drift-corrected current and the drift current of the current sensor are added up, so that the current real value of the battery management system is obtained. The system includes a temperature drift correction module, a voltage residual calculation module, a drift current calculation module, and a current real value acquisition module. The device includes a memory and a processor. According to the current drift correction method, systemand device of the present invention, the closed-loop correction of the current of the current motor is realized according to the current real value which is obtained by adding up the temperature drift-corrected current and the drift current, and therefore, the current drift correction method, system and device of the invention have the advantages of small measurement error, high robustness and high compatibility, and can be widely applied to the battery balance field.
Description
technical field [0001] The invention relates to the field of battery equalization, in particular to a current drift correction method, system and device of a battery management system. Background technique [0002] Due to cost considerations, the actual current sensor used in the battery management system often has a certain drift value and the accuracy is not high. When measuring the cumulative state (such as using the current integration method to estimate the remaining battery capacity), the battery management system is prone to divergence caused by the drift of the current sensor. For this reason, it is necessary to correct the drift of the current sensor to reduce the measurement error. [0003] The existing drift correction technology mainly uses open-loop sampling method to correct the drift of the current sensor, or corrects the drift of the current sensor at zero current. not good. Contents of the invention [0004] In order to solve the above technical problem...
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