Absorption circuit for the recharge current and control method

CN115514051BActive Publication Date: 2026-07-14SUNGIANT AUTOMOTIVE ELECTRONICS CO LTD

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Patents(China)
Current Assignee / Owner: SUNGIANT AUTOMOTIVE ELECTRONICS CO LTD
Filing Date: 2022-10-10
Publication Date: 2026-07-14

AI Technical Summary

Technical Problem

Frequent high-current recharging of batteries under low-temperature conditions will severely shorten battery life. Existing technologies cannot effectively utilize the recharging current without damaging battery life.

Method used

An absorption circuit is connected in parallel on the bus circuit between the battery pack and the motor. The absorption circuit is composed of switching devices and discharging devices. By acquiring the battery temperature and current value, the switching devices are controlled to close the absorption circuit, so that the recharge current is transmitted to the absorption circuit and absorbed by the discharging devices, thus avoiding frequent high-current recharge.

Benefits of technology

Effectively utilize the recharge current for battery recharge control to avoid shortening battery life under low temperature conditions and improve battery life.

✦ Generated by Eureka AI based on patent content.

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Figure CN115514051B_ABST

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Abstract

The application relates to the technical field of electric vehicles, and provides a back-charge current absorption circuit and a control method, the absorption circuit comprising a switching device, a discharging device and a back-charge control module; wherein the switching device is connected in parallel with a motor, the discharging device is connected in series with the switching device; the back-charge control module is connected with the switching device, is used for acquiring a battery temperature of a battery pack and a current value in a bus circuit between the battery pack and the motor, and in the case that a back-charge current exists in the bus circuit, the switching device is controlled according to the battery temperature and the current value to close the absorption circuit, so that the back-charge current is transmitted to the absorption circuit and the back-charge current is absorbed through the discharging device. While realizing battery back-charge control, the current value of the back-charge current and the battery temperature of the battery pack are taken as regulation and control parameters, so that frequent large-current back-charge of the battery under a low-temperature condition is avoided, and the service life of the battery is prolonged.

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