A pyrotechnic resistance detection circuit, system, method, battery, and vehicle

By using the voltage difference ratio between the current source module, the detection resistor, and the current limiting module in the pyrotechnic resistance detection circuit to calculate the resistance value of the pyrotechnic, the problem of large detection error caused by the accuracy of the current source in the existing technology is solved, and more reliable detection is achieved.

CN122307195APending Publication Date: 2026-06-30BEIJING CHEHEJIA AUTOMOBILE TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BEIJING CHEHEJIA AUTOMOBILE TECH CO LTD
Filing Date
2024-12-31
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing pyrotechnic resistance detection circuits suffer from large detection errors due to limitations in the accuracy of the current source, which affects the reliability of the detection.

Method used

A pyrotechnic resistance detection circuit is adopted, which includes a current source module, a detection resistor, a pyrotechnic resistor and a current limiting module connected in sequence. The voltage value is obtained through the first, second and third sampling points, and the resistance value of the pyrotechnic resistor is calculated by using the ratio of the voltage difference to the resistance value, thus avoiding dependence on a high-precision current source.

Benefits of technology

This improves the reliability of resistance detection for pyrotechnic devices and solves the problem of the reliability of detection being affected by the accuracy of the current source.

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Abstract

This invention discloses a pyrotechnic resistance detection circuit, system, method, battery, and vehicle. The pyrotechnic resistance detection circuit includes a current source module, a detection resistor, a pyrotechnic resistor, and a current limiting module connected in sequence. It also includes a first sampling point, a second sampling point, and a third sampling point. The first sampling point is located between the current source module and the detection resistor; the second sampling point is located between the detection resistor and the pyrotechnic resistor; and the third sampling point is located between the pyrotechnic resistor and the current limiting module. The pyrotechnic resistance detection circuit, system, method, battery, and vehicle provided by this invention can ensure reliable detection.
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