High voltage power supply system and vehicle

By using a double-pole double-throw switch design, the series and parallel switching of battery modules in the high-voltage power supply system of new energy vehicles is realized, solving compatibility and cost issues and improving charging efficiency and safety.

CN122143640APending Publication Date: 2026-06-05XIAOMI EV TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
XIAOMI EV TECH CO LTD
Filing Date
2024-12-03
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

In existing technologies, the high-voltage power supply system of new energy vehicles is not compatible with both 400V and 800V voltage platforms, resulting in inconvenient charging time and high cost, complex control logic, and susceptibility to short circuits.

Method used

A double-pole double-throw switch replaces multiple relays. By synchronously moving the first and second moving terminals and connecting and disconnecting them with the stationary terminals, the series and parallel switching of battery modules can be realized, supporting the conversion between 400V and 800V voltage platforms.

Benefits of technology

The control logic has been simplified, the cost has been reduced, and flexible switching between 400V and 800V voltage platforms has been achieved, improving charging efficiency and safety.

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Abstract

The present disclosure relates to a high-voltage power supply system and a vehicle, the high-voltage power supply system comprising a plurality of phase-connected battery modules and a contactor; the contactor having a first static terminal, a second static terminal, a first dynamic terminal and a second dynamic terminal; the first dynamic terminal and the second dynamic terminal moving synchronously; the first dynamic terminal selectively engaging with one of the first static terminal and the second static terminal and being disconnected from the other; the second dynamic terminal engaging with or being disconnected from the first static terminal, so that the plurality of battery modules are selectively connected in parallel or in series. When the first dynamic terminal engages with the first static terminal and is disconnected from the second static terminal, and the second dynamic terminal is disconnected from the first static terminal, the plurality of battery modules are in a series state, corresponding to an 800V series mode. When the first dynamic terminal is disconnected from the first static terminal and engages with the second static terminal, and the second dynamic terminal engages with the first static terminal, the plurality of battery modules are in a parallel state, corresponding to a 400V parallel mode, and the conversion between the two voltage platforms can be smoothly realized.
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