Battery self-heating systems and vehicles

The battery self-heating system addresses voltage fluctuations and heating limitations by using dual battery packs and controlled charging/discharging, ensuring efficient and safe battery heating in electric vehicles.

JP2025527641AActive Publication Date: 2025-08-22BYD CO LTD
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Patent Information

Application Number
JP2025511376
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2022-08-31
Filing Date
2023-04-25
Publication Date
2025-08-22
Estimated Expiration
2043-04-25

AI Technical Summary

Technical Problem

Existing battery heating methods in electric vehicles cause significant voltage fluctuations, leading to potential damage and reduced service life, especially in low-temperature environments, and limit heating power due to current limitations.

Method used

A battery self-heating system with dual battery packs and heating modules, controlled by a controller to alternately charge and discharge, ensuring balanced voltage fluctuations and efficient heating using multiple drive motor controllers and motors.

Benefits of technology

The system effectively heats the batteries while minimizing voltage fluctuations, preventing charging failures and extending battery life by utilizing existing vehicle components for heating, thus enhancing battery performance in cold conditions.

✦ Generated by Eureka AI based on patent content.

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  • Figure 2025527641000001_ABST
    Figure 2025527641000001_ABST
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Abstract

A battery self-heating system, comprising a power battery pack (21), a first heating module (22), a second heating module (23), and a controller (24), wherein the power battery pack (21) comprises a first battery group (E1) and a second battery group (E2) connected in series, the first heating module (22) comprises a first heating sub-module (221) and a second heating sub-module (222), the second heating module (23) comprises a third heating sub-module (231) and The battery pack includes a fourth heating sub-module (232), and the controller (24) is configured to control the first heating module (22) and the first battery group (E1) to alternately charge and discharge, and to control the second heating module (23) and the second battery group (E2) to alternately charge and discharge, so that when one of the first battery group (E1) and the second battery group (E2) is in a discharging state, the other of the first battery group (E1) and the second battery group (E2) is in a charging state.
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Citation Information

Patent Citations

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    CN105762434A

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    CN113022344A

  • Double-battery integrated charging topology circuit of electric vehicle and interleaving control strategy method of double-battery integrated charging topology circuit

    CN114435163A

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    CN212373187U

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