Battery cell monitoring and balancing circuit

Abstract

A monitoring circuit for monitoring a plurality of battery cells of a battery pack includes a plurality of temperature sensors, an analog to digital converter (ADC) and a processor. The plurality of temperature sensors is used for sensing temperatures of the plurality of battery cells and outputting a plurality of analog temperature voltage signals representative of the temperature of the plurality of battery cells. The analog to digital converter (ADC) is adapted to receive the plurality of analog temperature voltage signals and to convert each of the plurality of analog temperature voltage signals to a plurality of individual digital signals. The processor is adapted to generate an alert signal when an individual digital signal is not within a predetermined range.

Description

Battery Monitoring and Balancing Circuitry technical field The invention relates to a battery monitoring and balancing circuit, in particular to a battery monitoring and balancing circuit which directly digitizes analog battery voltage levels into corresponding digital signals, and uses the digital signals to generate intelligent protection and balancing instructions. Background technique Multi-cell rechargeable batteries are widely used due to their high voltage output and large capacity. Including, but not limited to, electronic devices such as notebook computers, portable phones, and personal digital assistants. Certain types of rechargeable batteries, such as lithium-ion batteries, are very dangerous if charged significantly above their normal charge range or discharged below their normal charge range. Therefore, typical monitoring and protection circuits use switching networks to divert the voltage load to a capacitor. Thus, the capacitor voltage represents the volt...

AI Technical Summary

Problems solved by technology

First, the voltage measured by the circuit is not accurate

For example, if the current flowing through individual battery cells is not constant, or if the battery voltage fluctuates due to battery internal resistance or other factors, the sampled voltage will not correctly indicate the battery voltage

Thus, incorrect measurement results can be obtained based on this erroneous measurement method

Second, the threshold level (such as high level threshold or low level threshold) is not easy to adjust

In order to avoid excessive heat generation, the discharge current is usually limited, so the discharge needs a certain time interval

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