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Method for detecting voltage of lithium battery

by:dcfpower     2021-02-23
Abstract: This design provides a voltage detection method for isolated lithium batteries with simple circuit implementation, high precision, and micro power consumption. The lithium battery voltage detection method adopts the principle of battery voltage mirror detection, based on electromagnetic switch technology, to obtain the original data and fit it, and the data fitting method determines the advantages of the circuit. Practice shows that this method has simple and practical circuit, high detection accuracy, wide application range, and high practical value. Keywords: lithium battery pack; voltage detection; mirror detection; data fitting. The advantages of high energy ratio, long life, light weight, and green environmental protection make lithium batteries widely used in power generation and energy storage systems such as water power, thermal power, wind power and solar power plants. The detection of the voltage of the lithium battery is very important for the entire power generation and energy storage system. The control signal of the system works in the same area according to the difference of the battery voltage. At present, the voltage measurement methods of lithium batteries include mechanical relay method isolation detection, differential amplifier method isolation detection, voltage divider method isolation detection, and photoelectric relay method isolation detection. The poor precision and complex structure make these methods not widely used. This paper presents an isolated lithium battery voltage detection method with simple circuit implementation, high precision and low power consumption. u003cpu003eSystem designu003c/pu003eu003cpu003eThis system adopts the principle of battery voltage mirror detection. As shown in Figure 1, the primary side L3 forms an oscillating circuit, and the multiple sides L1 and L2 have a symmetrical rectified output structure, so that the sampling output voltage at point B is opposite to the voltage at point A of the lithium battery. Since the detection method is based on electromagnetic switching technology, the original signal obtained is not very non-linear, so the data fitting method determines the advantage of the circuit. Under the condition that VCC is 12 V, the oscillation frequency is 10 kHz, and the coil turns ratio is 12:10:10, the 0~5 V lithium battery is measured to obtain the data shown in Table 1. u003c/pu003eu003cpu003eu003cpu003eFigure 1 mirror image detection principle diagramu003c/pu003eu003cpu003eThe data measurement in the text is in the range of 0~5 V, and the measurement is made at intervals of 0.1 V. u003c/pu003eu003c/pu003eu003cpu003eThis article proposes a lithium battery pack voltage detection method. The system detection is better than 3% when the battery voltage is less than 1 V, and the system detection error is better than 1% when the battery voltage is above 1 V. . The detection method has simple and practical circuits, high detection accuracy, wide application range, and strong practical application value. u003c/pu003eu003c/pu003e
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