Battery heating system and vehicle

By incorporating a DC-DC converter into the lithium-ion battery to form a self-heating circuit, the power battery pack can be self-heated using the charging and discharging pulses between battery packs. This solves the problem of decreased charging and discharging performance at low temperatures and ensures the thermal management and power supply requirements of the battery pack under different operating conditions.

CN120363794BActive Publication Date: 2026-06-05XIAOMI EV TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
XIAOMI EV TECH CO LTD
Filing Date
2025-06-19
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Lithium-ion batteries exhibit significantly reduced charge and discharge performance at low temperatures, and current technologies struggle to effectively heat the power battery to improve charge and discharge performance during driving or parking conditions.

Method used

By setting up a first DC-DC converter and a second DC-DC converter in series with a first battery pack and a second battery pack to form a self-heating circuit, one DC-DC converter performs a step-down conversion and the other performs a step-up conversion to realize charging and discharging pulses between the battery packs, thereby generating heat for self-heating.

Benefits of technology

The system enables self-heating of the power battery pack during driving or parking conditions, improving charging and discharging performance without affecting the power supply of the power battery pack to the drive system, thus ensuring dynamic balance between battery packs.

✦ Generated by Eureka AI based on patent content.

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    Figure CN120363794B_ABST
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Abstract

The present disclosure relates to a battery heating system and a vehicle, and relates to the technical field of vehicles, and the system comprises a power battery pack, a first DCDC converter and a second DCDC converter, wherein the power battery pack comprises a first battery pack and a second battery pack connected in series, the first DCDC converter is connected with the first battery pack; the second DCDC converter is connected in series with the first DCDC converter, and the second DCDC converter is connected with the second battery pack; in the driving or parking working condition, the first DCDC converter and the second DCDC converter can form a self-heating loop with the first battery pack and the second battery pack, and the self-heating loop is used for heating the power battery pack, wherein in the case that one of the first DCDC converter and the second DCDC converter is used for step-down conversion, the other is used for step-up conversion. Thus, the self-heating of the power battery pack can be realized in the driving or parking working condition.
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