Charging control method and apparatus, battery management system and readable storage medium
The present application provides a charging control method and apparatus, a battery management system and a readable storage medium. The charging control method includes: obtaining a battery temperature and a battery state of charge; determining a pulse charging frequency according to the battery temperature, the battery state of charge and a pre-calibrated corresponding relationship; obtaining a preset waveform characteristic of a pulse charging waveform; where the waveform characteristic includes a ratio range of an area of a positive pulse waveform to an area of a negative pulse waveform in each pulse cycle of the pulse charging waveform; and generating a charging request according to the pulse charging frequency and the waveform characteristic and transmitting the charging request to a charging device. The method is used for improving charging stability and safety of a battery.
1. A charging control method, comprising:
obtaining a battery temperature and a battery state of charge;
determining a pulse charging frequency according to the battery temperature, the battery state of charge and a pre-calibrated corresponding relationship, wherein the pre-calibrated corresponding relationship is a corresponding relationship between a battery temperature, a battery state of charge, and a pulse charging frequency;
obtaining a preset waveform characteristic of a pulse charging waveform, wherein the waveform characteristic comprises a ratio range of an area of a positive pulse waveform to an area of a negative pulse waveform in each pulse cycle of the pulse charging waveform, an upper limit of the ratio range is 10 and a lower limit of the ratio range is 1;
generating a charging request according to the pulse charging frequency and the waveform characteristic; and
transmitting the charging request to a charging device.
2. The charging control method according to claim 1 , wherein a frequency range of the pulse charging frequency in the pre-calibrated corresponding relationship is: 200 Hz-1500 Hz.
3. The charging control method according to claim 1 , wherein before the determining a pulse charging frequency according to the battery temperature, the battery state of charge and a pre-calibrated corresponding relationship, the charging control method further comprises:
determining whether the battery temperature is in a preset temperature range;
the determining a pulse charging frequency according to the battery temperature, the battery state of charge and a pre-calibrated corresponding relationship comprises:
when determining that the battery temperature is in the preset temperature range, determining the pulse charging frequency according to the battery temperature, the battery state of charge and the pre-calibrated corresponding relationship.
4. The charging control method according to claim 1 , wherein the waveform characteristic further comprises a preset current peak of the positive pulse waveform corresponding to the battery temperature and the state of charge, and a preset current peak of the negative pulse waveform corresponding to the battery temperature and the state of charge, and the current peak of the negative pulse waveform is greater than the current peak of the positive pulse waveform.
5. The charging control method according to claim 4 , wherein the waveform characteristic further comprises a positive pulse waveform characteristic, the positive pulse waveform characteristic is represented as
∫
t
1
t
2
F
(
t
)
≥
I
max
+
*
(
t
2
-
t
1
)
2
;
wherein F(t) represents the positive pulse waveform, ∫ t1 t2 F(t) is the area of the positive pulse waveform, t 1 is a starting time of the positive pulse waveform, t 2 is an ending time of the positive pulse waveform and I max+ is a current peak of the positive pulse waveform.
6. The charging control method according to claim 4 , wherein a battery voltage corresponding to the current peak of the positive pulse waveform is smaller than a pre-calibrated charging cutoff voltage, and the charging cutoff voltage is a decomposition voltage of a battery electrolyte or a breakdown voltage value of a battery separator.
7. A battery management system, comprising a processor; and a memory communicatively connected with the processor;
wherein the memory stores an instruction executable by the processor, and the instruction is executed by the processor to cause the processor to perform a charging control method, and the charging control method comprises:
obtaining a battery temperature and a battery state of charge;
determining a pulse charging frequency according to the battery temperature, the battery state of charge and a pre-calibrated corresponding relationship, wherein the pre-calibrated corresponding relationship is a corresponding relationship between a battery temperature, a battery state of charge, and a pulse charging frequency;
obtaining a preset waveform characteristic of a pulse charging waveform, wherein the waveform characteristic comprises a ratio range of an area of a positive pulse waveform to an area of a negative pulse waveform in each pulse cycle of the pulse charging waveform, an upper limit of the ratio range is 10 and a lower limit of the ratio range is 1;
generating a charging request according to the pulse charging frequency and the waveform characteristic; and
transmitting the charging request to a charging device.
8. The battery management system according to claim 7 , wherein a frequency range of the pulse charging frequency in the pre-calibrated corresponding relationship is: 200 Hz-1500 Hz.
9. The battery management system according to claim 7 , before the determining a pulse charging frequency according to the battery temperature, the battery state of charge and a pre-calibrated corresponding relationship, the charging control method further comprises:
determining whether the battery temperature is in a preset temperature range;
the determining a pulse charging frequency according to the battery temperature, the battery state of charge and a pre-calibrated corresponding relationship comprises:
when determining that the battery temperature is in the preset temperature range, determining the pulse charging frequency according to the battery temperature, the battery state of charge and the pre-calibrated corresponding relationship.
10. The battery management system according to claim 7 , wherein the waveform characteristic further comprises a preset current peak of the positive pulse waveform corresponding to the battery temperature and the state of charge, and a preset current peak of the negative pulse waveform corresponding to the battery temperature and the state of charge, and the current peak of the negative pulse waveform is greater than the current peak of the positive pulse waveform.
11. The battery management system according to claim 10 , wherein the waveform characteristic further comprises a positive pulse waveform characteristic, the positive pulse waveform characteristic is represented as
∫
t
1
t
2
F
(
t
)
≥
I
max
+
*
(
t
2
-
t
1
)
2
;
wherein F(t) represents the positive pulse waveform, ∫ t1 t2 F(t) is the area of the positive pulse waveform, t 1 is a starting time of the positive pulse waveform, t 2 is an ending time of the positive pulse waveform and I max+ is a current peak of the positive pulse waveform.
12. The battery management system according to claim 10 , wherein a battery voltage corresponding to the current peak of the positive pulse waveform is smaller than a pre-calibrated charging cutoff voltage, and the charging cutoff voltage is a decomposition voltage of a battery electrolyte or a breakdown voltage value of a battery separator.
13. A readable storage medium, wherein a computer program is stored on the readable storage medium, and when the computer program is operated by a computer, a charging control method is performed, and the charging control method comprises:
obtaining a battery temperature and a battery state of charge;
determining a pulse charging frequency according to the battery temperature, the battery state of charge and a pre-calibrated corresponding relationship, wherein the pre-calibrated corresponding relationship is a corresponding relationship between a battery temperature, a battery state of charge, and a pulse charging frequency;
obtaining a preset waveform characteristic of a pulse charging waveform, wherein the waveform characteristic comprises a ratio range of an area of a positive pulse waveform to an area of a negative pulse waveform in each pulse cycle of the pulse charging waveform, an upper limit of the ratio range is 10 and a lower limit of the ratio range is 1;
generating a charging request according to the pulse charging frequency and the waveform characteristic; and
transmitting the charging request to a charging device.
14. The readable storage medium according to claim 13 , wherein a frequency range of the pulse charging frequency in the pre-calibrated corresponding relationship is: 200 Hz-1500 Hz.
15. The readable storage medium according to claim 13 , before the determining a pulse charging frequency according to the battery temperature, the battery state of charge and a pre-calibrated corresponding relationship, the charging control method further comprises:
determining whether the battery temperature is in a preset temperature range;
the determining a pulse charging frequency according to the battery temperature, the battery state of charge and a pre-calibrated corresponding relationship comprises:
when determining that the battery temperature is in the preset temperature range, determining the pulse charging frequency according to the battery temperature, the battery state of charge and the pre-calibrated corresponding relationship.
16. The readable storage medium according to claim 13 , wherein the waveform characteristic further comprises a preset current peak of the positive pulse waveform corresponding to the battery temperature and the state of charge, and a preset current peak of the negative pulse waveform corresponding to the battery temperature and the state of charge, and the current peak of the negative pulse waveform is greater than the current peak of the positive pulse waveform.
17. The readable storage medium according to claim 16 , wherein the waveform characteristic further comprises a positive pulse waveform characteristic, the positive pulse waveform characteristic is represented as
∫
t
1
t
2
F
(
t
)
≥
I
max
+
*
(
t
2
-
t
1
)
2
;
wherein F(t) represents the positive pulse waveform, ∫ t1 t2 F(t) is the area of the positive pulse waveform, t 1 is a starting time of the positive pulse waveform, t 2 is an ending time of the positive pulse waveform and I max+ is a current peak of the positive pulse waveform.
18. The readable storage medium according to claim 16 , wherein a battery voltage corresponding to the current peak of the positive pulse waveform is smaller than a pre-calibrated charging cutoff voltage, and the charging cutoff voltage is a decomposition voltage of a battery electrolyte or a breakdown voltage value of a battery separator.