Battery management device, battery management method and circuit applying device

Abstract

The invention provides a battery management device, a battery management method and a circuit applying the device. The battery management device comprises an analog-digital converter, a microcontroller, a voltage regulator and a control circuit. The analog-digital converter is connected with a plurality of batteries and used for performing analog-digital conversion on single battery voltage. The microcontroller is connected with the analog-digital converter and used for receiving and processing the single battery voltage output by the analog-digital converter. The voltage regulator is connected with a power supply, the analog-digital converter and the microcontroller and used for providing operation voltage for the analog-digital converter and the microcontroller. The control circuit is connected with the power supply and the voltage regulator and used for receiving control signals to control the voltage regulator to output operation voltage. The battery management device can be in a power-off mode, the cost is low, the power consumption is low, and the reliability is high.

Description

technical field [0001] The invention relates to the field of battery management, in particular to a battery management device, a method and a circuit using the device. Background technique [0002] The battery management chip that protects multiple strings of lithium batteries, such as the protection of 12 strings of lithium batteries, the maximum operating voltage of the battery management chip can reach 60V. Usually, in order to meet the high withstand voltage of high-voltage devices, the gate oxide will be made thicker, but if the gate oxide is too thick, it will lead to defects such as large parasitic parameters, poor performance, small transconductance and high turn-on voltage of the device. In the prior art, according to the general process, in order to take into account the requirements of withstand voltage and performance, the thickness of the gate oxide of the high-voltage device is relatively moderate, so as to ensure that the turn-on voltage is about 1V. However,...

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Problems solved by technology

[0003] Therefore, since the commonly used battery management chips currently on the market cannot make the chip itself in a power-off mode, it usually requires complex external circuits to achieve this, which will lead to high chip costs and poor reliability.

Moreover, because the chip cannot be in power-off mode, the minimum power consumption of the existing battery management chip can only reach about 10uA, or even higher

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