Method for improving voltage sampling precision of single battery in charge equalization
A single battery and charging equalization technology, which is applied in the direction of secondary battery charging/discharging, secondary battery, secondary battery repair/maintenance, etc., can solve problems such as inaccuracy, sampling error, and inability to filter effectively in time, and achieve The effect of protecting from damage, improving sampling accuracy, and not reducing voltage sampling accuracy
Inactive Publication Date: 2017-02-22
HUIZHOU BNET TECH CO LTD
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Problems solved by technology
When there is current passing through the wire harness of charging balance, the voltage loss caused by the impedance of the wire harness itself forms a line loss, which affects the sampling accuracy of the single voltage
The existing detection methods cannot timely and effectively filter out the line loss of the power battery system during charging equalization or the filtering is not accurate enough, resulting in the sampling error of the single cell voltage of the single battery in the power battery system
Method used
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[0031] see figure 1 , a method for improving the voltage sampling accuracy of a single battery during charge equalization, comprising the following steps:
[0032] S101. Detect the voltage value of each single battery before and after equalization is turned on;
[0033] S102. Calculate the differential pressure value of each single battery before and after equalization is turned on;
[0034] S103. During the equalization process, subtract the corresponding voltage difference value from the current voltage value of each single battery to obtain the actual voltage value of each single battery.
[0035] Further, the step S101:
[0036] S1011. Before equalization is turned on, detect the initial voltage value of each single battery;
[0037] S1012. After the equalization is turned on, continuously detect and record the voltage value of each single battery multiple times;
[0038] The step S102:
[0039] S1021. Calculate the voltage difference between each detected voltage val...
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The invention discloses a method for improving voltage sampling precision of a single battery in charge equalization. The method comprises the following steps of S101, detecting voltage values of each single battery before and after equalization starting; S102, calculating voltage difference values of each single battery before and after equalization starting; and S103, in the equalization process, obtaining the actual voltage value of each single battery by subtracting a corresponding voltage difference value from the current voltage value of each single battery. The method comprises the steps of calculating an average voltage difference value after equalization starting; then the more accurate actual voltage value is obtained by subtracting the average voltage difference value from the voltage value, detected in real time, of the single battery, so that the voltage sampling precision of the single battery in charge equalization is improved; therefore, it is ensured that the voltage sampling precision of the single battery in the equalization process is not reduced; meanwhile, the changes of a charging current, the voltage of the single battery and the temperature are detected in real time by a power battery system; and when an abnormal condition occurs, the charge equalization is closed so as to protect the power battery system from being damaged.
Description
technical field [0001] The invention relates to the field of charge equalization of battery packs, in particular to a method for improving the voltage sampling accuracy of a single battery during charge equalization. Background technique [0002] Under the advocacy of green energy, the power battery system, as the main source of power for new energy electric vehicles, plays an irreplaceable role in the vehicle system, and it is increasingly popular with the public. The age of the system comes into focus. The difference in physical properties between the individual cells of the new power battery system is relatively small. With the accumulation of use time, the difference in the external environment, the aging of the internal components of the battery and other factors, the differences between the individual cells gradually become larger, that is, The consistency between individual cells becomes poor. Usually, we use a balancing circuit to improve the consistency between si...
Claims
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Login to View More IPC IPC(8): H01M10/44
CPCH01M10/441Y02E60/10
Inventor 徐文赋任素云谢小科
Owner HUIZHOU BNET TECH CO LTD