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Lithium battery power detection method

1. Voltage testing method: It means that the power of a lithium battery is obtained by simply monitoring the voltage of the battery. The power and voltage of lithium batteries are not linearly related, so this testing method is not accurate, with a power measurement accuracy of only over 20%. Especially when the battery level is below 50%, the calculation of the phone's battery level will become very inaccurate. So this method has very limited protection for batteries.

2. Battery modeling method: This method is based on the discharge curve of lithium batteries to establish a data table, which will indicate the power values at different voltages. This method can effectively improve the measurement accuracy. But obtaining an accurate data table is not simple, as the relationship between voltage and battery capacity also involves factors such as temperature, self discharge, and aging of lithium batteries. Only by combining numerous factors for correction can satisfactory electricity measurement be obtained.

3. Coulombometer: Coulombometer is a current checking resistor connected in series between the positive and negative electrodes of a lithium battery. When a current flows through the resistor, Vsense is generated, and the current flowing through the battery can be calculated by detecting Vsense. Therefore, it is possible to accurately track changes in battery capacity with an accuracy of up to 1%. Additionally, by combining battery voltage and temperature, the impact of factors such as lithium battery aging on measurement results can be greatly reduced. The iPhone uses this method.

How to monitor the remaining power of lithium batteries in real time?

1. For lead-acid batteries with an approximate linear relationship between battery capacity and voltage, the remaining battery capacity can be determined by measuring the terminal voltage.

2. Lithium batteries (especially lithium iron phosphate batteries) cannot be determined simply by voltage due to their relatively stable voltage.

The best way to monitor the remaining power of lithium batteries in real time is to use smart chips such as TI's BQ3050 chip.

The majority of laptop batteries use TI chips.

5. It mainly relies on the integration method to calculate the remaining electricity. Some intelligent protection boards may also incorporate characteristic curves such as cell temperature, voltage, and current to assist the integration algorithm in providing accuracy of remaining power.

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