Patent ID: 11909245
Assignee: BEIJING XIAOMI MOBILE SOFTWARE CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 8:
9. A battery charging apparatus, comprising:
a determining circuit, configured to acquire a current static voltage of a battery in a current charging stage, and determine the maximum charging current matching with the current static voltage, during staged charging of the battery; and
a charging circuit, configured to charge the battery according to the maximum charging current,
wherein the determining circuit is configured to determine the maximum charging current matching with the current static voltage by:
determining the maximum charging current matching with the current static voltage according to a real-time static voltage and a real-time DC resistance of the battery, when the current static voltage is greater than or equal to a charging voltage threshold corresponding to the current charging stage;
acquiring the real-time DC resistance and the real-time static voltage of the battery in real-time;
determining the maximum charging current matching with the real-time DC resistance and matching the real-time static voltage based on a corresponding relationship among the DC resistance, the static voltage, and the maximum charging current;
determining the longest response time of a system that triggers an overvoltage protection in the current charging stage, during the staged charging of the battery with different maximum charging currents according to different voltages, in response to the static voltage of the battery being greater than or equal to the charging voltage threshold corresponding to the current charging stage, and detecting the DC resistance and the static voltage of the battery in real-time in the current charging stage;
determining the maximum charging current matching with the DC resistance and matching with the static voltage based on the detected DC resistance and static voltage, wherein the maximum charging current matching with the DC resistance and matching with the static voltage satisfies a requirement of not triggering the overvoltage protection within the longest response time of the system; and
creating and storing the corresponding relationship among the DC resistance, the static voltage, and the maximum charging current.