An online high-precision battery internal resistance detection device based on a digital-to-analog conversion chip

By designing a circuit based on a digital-to-analog converter chip, combined with high-precision ADC sampling and external control, high-precision and low-cost online detection of battery internal resistance was achieved. This solved the problems of insufficient accuracy and poor reliability of traditional detection technologies and met the needs of highly dynamic intelligent battery applications.

CN224553449UActive Publication Date: 2026-07-24CHENGDU INTEGRID TECH CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Utility models(China)
Current Assignee / Owner
CHENGDU INTEGRID TECH CO LTD
Filing Date
2025-05-20
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Traditional battery internal resistance detection technology suffers from problems such as insufficient accuracy, weak dynamic monitoring capability, interference with battery status, high cost, and poor adaptability to various scenarios, making it difficult to meet the needs of highly dynamic, highly reliable, and intelligent battery applications.

Method used

By adopting a circuit topology and control strategy based on a digital-to-analog converter chip, combined with a 24-bit ADC sampling chip and an external control chip, high-precision online battery internal resistance detection is achieved through battery voltage sampling, digital-to-analog conversion, and battery discharge circuits.

Benefits of technology

It achieves high-precision battery internal resistance detection, supports online detection, reduces costs, improves system reliability, and reduces quantization errors and signal noise interference.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a kind of online high-precision battery internal resistance detection devices based on digital-analog conversion chip, it is related to power electronics field, the device includes battery voltage sampling circuit, digital-analog conversion circuit and battery discharge circuit, battery voltage sampling circuit connects battery to be measured, obtains the discharge voltage of voltage sampling loop and the open-circuit voltage of battery open-circuit voltage loop;Battery discharge circuit connects battery to be measured, and is used to obtain the discharge current of battery to be measured in voltage sampling loop;Battery voltage sampling circuit and battery discharge circuit are connected with digital-analog conversion circuit, and digital-analog conversion circuit obtains open-circuit voltage, discharge voltage and discharge current;By optimizing circuit topology and control strategy, the high-precision battery internal detection is realized, simultaneously meet the special needs of online detection under battery charge-discharge working condition, to solve the precision insufficient, not online detection, high cost and poor reliability and other problems of existing battery internal resistance detection device.
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