Granted Patent B2

US 12,640,408 · App. 17/738,679 · Granted May 26, 2026

Inventors: Jie Xie (Shenzhen, CN); Guanghui Zhang (Dongguan, CN); Wei Liu (Dongguan, CN)

Assignee: HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD.

H01M10/443H01M10/486H01M10/615H01M10/625H01M10/633H01M10/657H01M2220/20

Abstract

Claims (93)

1 . A battery heating system comprising:

a temperature monitor configured to:

monitor a temperature of a to-be-heated battery; and

output a temperature monitoring signal indicating the temperature;

an impedance monitor configured to:

monitor an impedance of the to-be-heated battery; and

output an impedance monitoring signal indicating the impedance;

a controller coupled to the temperature monitor and the impedance monitor and configured to:

receive the temperature monitoring signal;

output a control signal based on the temperature monitoring signal;

receive the impedance monitoring signal; and

determine, based on the impedance monitoring signal, a first current value of a maximum charging current or a maximum discharging current; and

a voltage converter coupled to the controller and configured to:

couple to a power supply and the to-be-heated battery;

receive the control signal from the controller;

receive a first voltage from the power supply or a second voltage from the to-be-heated battery; and

perform, based on the control signal, boosting processing or bucking processing on the first voltage or the second voltage to:

enable the power supply to output a positive/negative pulse signal to the to-be-heated battery and to enable the power supply and the to-be-heated battery to alternately charge each other and discharge each other based on the positive/negative pulse signal; and

make a charging current of the to-be-heated battery in a first time interval be less than the maximum charging current or make a discharging current of the to-be-heated battery in a second time interval be less than the maximum discharging current,

wherein the first time interval is for charging the to-be-heated battery in a charging and discharging time period, and

wherein the second time interval is for discharging the to-be-heated battery in the charging and discharging time period.

2 . The battery heating system of claim 1 , wherein the power supply comprises a first part of batteries in a battery pack, and wherein the to-be-heated battery comprises a second part of the batteries.

3 . The battery heating system of claim 1 , wherein the controller is further configured to:

output the control signal when the temperature monitoring signal indicates that the temperature is lower than a preset threshold; and

stop outputting the control signal when the temperature monitoring signal indicates that the temperature is higher than or equal to the preset threshold.

4 . The battery heating system of claim 1 , wherein the voltage converter is further configured to adjust, using the control signal, a first amplitude of the positive/negative pulse signal by adjusting a second amplitude of a relative voltage between the first voltage and the second voltage.

5 . The battery heating system of claim 1 , wherein the voltage converter is further configured to adjust, using the control signal, a frequency of charging/discharging between the power supply and the to-be-heated battery by adjusting a speed of switching a relative voltage between the first voltage and the second voltage.

6 . The battery heating system of claim 1 , wherein the voltage converter is further configured to control, using the control signal, a frequency of charging/discharging between the power supply and the to-be-heated battery to obtain a charging/discharging frequency of the to-be-heated battery that falls within a first frequency range of a dynamic control area.

7 . The battery heating system of claim 6 , wherein the controller is further configured to:

determine, based on the temperature and a preset correspondence between a battery temperature and the first frequency range, a second frequency range of the dynamic control area corresponding to the temperature; and

determine the charging/discharging frequency based on the second frequency range.

8 . The battery heating system of claim 6 , wherein the controller is further configured to:

determine, based on the impedance monitoring signal, a second frequency range of the dynamic control area corresponding to the to-be-heated battery in a current status; and

determine, based on the second frequency range, the charging/discharging frequency.

9 . The battery heating system of claim 1 , wherein the controller is further configured to determine, based on a state of charge and the temperature, a second current value of a current maximum charging current of the to-be-heated battery.

10 . The battery heating system of claim 1 , wherein the controller is further configured to determine, based on the temperature and a state of charge, a second current value of a current maximum discharging current of the to-be-heated battery.

11 . An electric vehicle comprising:

a first battery configured to output a first voltage;

a second battery configured to output a second voltage;

a temperature monitor coupled to the second battery and configured to:

monitor a temperature of the second battery; and

output a temperature monitoring signal indicating the temperature;

an impedance monitor configured to:

monitor an impedance of the first battery or the second battery; and

output an impedance monitoring signal indicating the impedance;

a controller coupled to the temperature monitor and the impedance monitor and configured to:

receive the temperature monitoring signal;

output a control signal based on the temperature monitoring signal;

receive the impedance monitoring signal; and

determine, based on the impedance monitoring signal, a current value of a maximum charging current or a maximum discharging current; and

a voltage converter coupled to the first battery and the second battery and configured to:

receive the first voltage or the second voltage;

receive the control signal from the controller; and

perform, based on the control signal, boosting processing or bucking processing on the first voltage or the second voltage to:

enable the first battery to output a positive/negative pulse signal to the second battery and the first battery and the second battery to alternately charge each other and discharge each other based on the positive/negative pulse signal; and

make a charging current of the second battery in a first time interval be less than the maximum charging current or make a discharging current of the second battery in a second time interval be less than the maximum discharging current,

wherein the first time interval is for charging the second battery in a charging and discharging time period, and

wherein the second time interval is for discharging the second battery in the charging and discharging time period.

12 . The electric vehicle of claim 11 , wherein the controller is further configured to:

output the control signal when the temperature monitoring signal indicates that the temperature is lower than a preset threshold; and

stop outputting the control signal when the temperature monitoring signal indicates that the temperature is higher than or equal to the preset threshold.

13 . The electric vehicle of claim 11 , wherein the voltage converter is further configured to adjust, using the control signal, a first amplitude of the positive/negative pulse signal by adjusting a second amplitude of a relative voltage between the first voltage and the second voltage.

14 . The electric vehicle of claim 11 , wherein the voltage converter is further configured to adjust, using the control signal, a frequency of charging/discharging between the first battery and the second battery by adjusting a speed of switching a relative voltage between the first voltage and the second voltage.

15 . A power supply system comprising:

a power supply configured to output a first voltage;

a to-be-heated battery configured to output a second voltage; and

a battery heating system comprising:

a temperature monitor coupled to the to-be-heated battery and configured to:

monitor a temperature of the to-be-heated battery; and

output a temperature monitoring signal indicating the temperature;

an impedance monitor configured to:

monitor an impedance of the to-be-heated battery; and

output an impedance monitoring signal indicating the impedance;

a controller coupled to the temperature monitor and configured to:

receive the temperature monitoring signal;

output a control signal based on the temperature monitoring signal;

receive the impedance monitoring signal; and

determine, based on the impedance monitoring signal, a current value of a maximum charging current or a maximum discharging current; and

a voltage converter coupled to the power supply, the to-be-heated battery, and the controller and configured to:

receive the first voltage or the second voltage;

receive the control signal from the controller; and

perform, based on the control signal, boosting processing or bucking processing on the first voltage or the second voltage to:

enable the power supply to output a positive/negative pulse signal to the to-be-heated battery and the power supply and the to-be-heated battery to alternately charge each other and discharge each other based on the positive/negative pulse signal; and

make a charging current of the to-be-heated battery in a first time interval be less than the maximum charging current or make a discharging current of the to-be-heated battery in a second time interval be less than the maximum discharging current,

wherein the first time interval is for charging the to-be-heated battery in a charging and discharging time period, and

wherein the second time interval is for discharging the to-be-heated battery in the charging and discharging time period.

16 . The power supply system of claim 15 , wherein the power supply comprises a first part of batteries in a battery pack, and wherein the to-be-heated battery comprises a second part of the batteries.

17 . The power supply system of claim 15 , wherein the controller is further configured to:

output the control signal when the temperature monitoring signal indicates that the temperature is lower than a preset threshold; and

stop outputting the control signal when the temperature monitoring signal indicates that the temperature is higher than or equal to the preset threshold.

18 . The power supply system of claim 15 , wherein the voltage converter is further configured to adjust, using the control signal, a first amplitude of the positive/negative pulse signal by adjusting a second amplitude of a relative voltage between the first voltage and the second voltage.

19 . The power supply system of claim 15 , wherein the voltage converter is further configured to adjust, using the control signal, a frequency of charging/discharging between the power supply and the to-be-heated battery by adjusting a speed of switching a relative voltage between the first voltage and the second voltage.

20 . The power supply system of claim 15 , wherein the voltage converter is further configured to control, using the control signal, a frequency of charging/discharging between the power supply and the to-be-heated battery to obtain a charging/discharging frequency of the to-be-heated battery that falls within a first frequency range of a dynamic control area.

Assignments (1)

Priority Claims (1)

Continuity (2)

References Cited (16)