A safety detection circuit and method for multiple battery packs in series

CN117723989BActive Publication Date: 2026-06-19NANJING TENGYA PRECISE TECHNOLOGY DEVELOPMENT CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NANJING TENGYA PRECISE TECHNOLOGY DEVELOPMENT CO LTD
Filing Date
2023-12-11
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

In scenarios where multiple battery packs are connected in series for power supply, existing technologies struggle to simultaneously identify the specifications and alarm status of each battery pack, and the detection solutions are either complex or have limited functionality.

Method used

Design a safety detection circuit for multiple battery packs connected in series. The detection loop is formed by a series resistor and an NMOS transistor. Combined with the voltage signal measured by the MCU, the resistance value of the identification resistor is calculated to identify the specifications of the battery pack. The alarm status is determined by the conduction and cutoff of the NMOS transistor.

Benefits of technology

It enables simple and efficient identification of battery pack specifications and alarm status in multi-battery pack series power supply scenarios, improving the safety of battery pack use and reducing testing costs.

✦ Generated by Eureka AI based on patent content.

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Abstract

This invention discloses a safety detection circuit for multiple battery packs connected in series, comprising several battery packs connected in series sequentially. The negative terminal of each battery pack is connected to the positive terminal of the adjacent preceding battery pack. The negative terminal of the first battery pack is grounded and connected to a first detection circuit. The other battery packs are each connected to a second detection circuit, and each second detection circuit is connected to the negative terminal of the first battery pack. The second detection circuit includes a first resistor connected to the positive terminal of the current battery pack, and the other pin of the first resistor is connected to a pin of an identification resistor and a third resistor. This invention enables the identification of battery pack specifications and the monitoring of alarm status of each battery pack in a multi-battery-pack series scenario, improving the safety of the battery packs and the equipment used. This invention uses only some general-purpose components, and the specifications of the components are all within standard requirements. The detection circuit is also relatively simple, resulting in low detection costs.
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