Self-heating circuit, charging system, self-heating system, and vehicle

By incorporating a self-heating circuit with transformers and switching components between battery packs, alternating charging and discharging between the battery packs is achieved, solving the problems of complex self-heating operation and voltage differences, and improving self-heating efficiency and system stability.

WO2026158405A1PCT designated stage Publication Date: 2026-07-30BYD CO LTD
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
BYD CO LTD
Filing Date
2026-01-21
Publication Date
2026-07-30

AI Technical Summary

Technical Problem

In the existing technology, the self-heating of the battery pack requires complex operation of setting the lead wires in the pack, and the change in the number of battery packs affects the self-heating effect and efficiency.

Method used

By setting up transformers and switching components between battery packs, a self-heating circuit with alternating charging and discharging is realized. The transformer's bridge arm and inductor network are used for oscillating heating to adapt to energy exchange between battery packs with different voltages.

Benefits of technology

It achieves efficient self-heating between battery packs, enhances the stability and reliability of the system, adapts to different charging station environments and battery pack voltage differences, and improves the flexibility and adaptability of the self-heating circuit.

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Abstract

A self-heating circuit (100), relating to the technical field of self-heating. The self-heating circuit comprises a first battery pack (101), a second battery pack (102), a transformer (103), and a switch assembly (104). By controlling the on-off states of the switch assembly, alternate charging and discharging of the first battery pack and the second battery pack are implemented to form oscillation heating, so as to achieve self-heating of the two battery packs, thereby enhancing the stability and reliability of a system; and the self-heating function can be realized regardless of whether the voltages of the first battery pack and the second battery pack are identical, thereby enabling better adaptation to different charging stations. In addition, the present invention further relates to a charging system, a self-heating system, and a vehicle.
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