Granted Patent B2

US 12,523,703 · App. 18/512,128 · Granted Jan 13, 2026

Inventor: Zhengbin Shen (Dongguan, CN)

Assignee: NINGDE AMPEREX TECHNOLOGY LIMITED

G01R31/374G01R31/3835H02J7/00306H02J7/0048

Abstract

Claims (32)

1 . A battery discharge undervoltage protection method, wherein the method comprises:

acquiring a temperature and a first voltage of a battery;

determining, based on the temperature, a depth of discharge of the battery;

determining, based on the first voltage, a first remaining capacity proportion of the battery; and

determining, based on the first remaining capacity proportion, the depth of discharge and a first undervoltage threshold, a second undervoltage threshold to increase a discharge capacity proportion of the battery, wherein the first undervoltage threshold is a preset undervoltage threshold, and the second undervoltage threshold is a dynamically adjusted undervoltage threshold.

2 . The battery discharge undervoltage protection method according to claim 1 , wherein the determining, based on the temperature, a depth of discharge of the battery comprises:

determining a temperature range corresponding to the temperature; and

determining, based on the temperature range, the depth of discharge corresponding to the temperature range.

3 . The battery discharge undervoltage protection method according to claim 1 , wherein the determining, based on the first voltage, a first remaining capacity proportion of the battery comprises:

determining, based on a parameter correspondence of the battery, the first remaining capacity proportion corresponding to the first voltage, wherein the parameter correspondence refers to a correspondence between a remaining capacity proportion and an open circuit voltage.

4 . The battery discharge undervoltage protection method according to claim 3 , wherein the determining, based on the first remaining capacity proportion, the depth of discharge and a first undervoltage threshold, a second undervoltage threshold comprises:

determining, based on the depth of discharge, a second remaining capacity proportion of the battery;

determining, based on the parameter correspondence, a second voltage corresponding to the second remaining capacity proportion;

determining, based on the second voltage and the first voltage, a voltage variation of the battery; and

determining, based on the voltage variation and the first undervoltage threshold, the second undervoltage threshold.

5 . The battery discharge undervoltage protection method according to claim 1 , wherein after the determining, based on the first remaining capacity proportion, the depth of discharge and the first undervoltage threshold, a second undervoltage threshold, the method further comprises:

acquiring a third voltage of the battery after discharge cutoff; and

determining, based on the second undervoltage threshold and the third voltage, whether to perform undervoltage protection for the battery.

6 . The battery discharge undervoltage protection method according to claim 5 , wherein the determining, based on the second undervoltage threshold and the third voltage, whether to perform undervoltage protection for the battery comprises:

determining a fourth voltage based on the third voltage; and

determining to perform undervoltage protection for the battery under the condition that the fourth voltage is less than the second undervoltage threshold.

7 . The battery discharge undervoltage protection method according to claim 3 , wherein before the determining, based on a parameter correspondence of the battery, the first remaining capacity proportion corresponding to the first voltage, the method further comprises:

charging the battery until a capacity of the battery reaches a full-charge capacity;

acquiring a full-charge voltage corresponding to the full-charge capacity;

discharging the battery until a voltage of the battery reaches a discharge cut-off voltage;

acquiring a voltage and a state of charge corresponding to the voltage of the battery during discharging; and

determining the parameter correspondence based on the voltage and the state of charge corresponding to the voltage.

8 . The battery discharge undervoltage protection method according to claim 4 , wherein the determining, based on the depth of discharge, a second remaining capacity proportion of the battery, comprises:

100% minus the depth of discharge is the second remaining capacity proportion.

9 . A battery apparatus, wherein the battery apparatus comprises a battery, a processor, and a memory; the memory stores a computer program; and when the computer program is executed by the processor, the battery discharge undervoltage protection method according to claim 1 is implemented.

10 . An electric apparatus, wherein the electric apparatus comprises a load and the battery apparatus according to claim 9 , and the battery apparatus is configured to provide electrical energy for the load.

11 . The electric apparatus according to claim 10 , wherein the electric apparatus comprises a drone, an electric vehicle, an electric tool, or an energy storage product.

Assignments (2)

Continuity (2)

References Cited (33)