CN-122000542-A - AC current pool heating

Abstract

Embodiments of the present disclosure relate to ac current pool heating. A system for managing a battery pack of an electric vehicle includes a sensor and a controller. The sensor is configured to detect a temperature associated with the battery pack. The controller is configured to send a request to the charger based on a sensor signal from the sensor and to provide at least a portion of the alternating current associated with the request and received from the charger to at least a first battery cell of the battery pack such that heat is generated based on the internal resistance of the first battery cell to increase a temperature associated with the first battery cell. Related electric vehicles, methods, and chargers are disclosed.

Inventors

• S.Patel
• V. Sankaranarayanan
• Liao Zitao
• B. JOHN
• GUO YIFEI
• S. MILLER
• A.Tao
• Z. Esadaoui

Assignees

• 特斯拉公司

Dates

Publication Date

20260508

Application Date

20251104

Priority Date

20250620

Claims (20)

1. 1. A system for managing a battery pack of an electric vehicle, the system comprising: A sensor configured to detect a temperature associated with the battery pack, and A controller in communication with the sensor, the controller configured to: Transmitting a request to a charger based on a sensor signal from the sensor, and At least a portion of the alternating current associated with the request and received from the charger is provided to at least a first battery cell of the battery pack such that heat is generated based on the internal resistance of the first battery cell to increase a temperature associated with the first battery cell.
2. 2. The system of claim 1, wherein the controller is configured to send the request to the charger in response to determining that the temperature associated with the battery pack meets a threshold based on the sensor signal.
3. 3. The system of claim 1, wherein the request specifies at least one of an amplitude, a frequency, or a direct current, DC, offset of the alternating current.
4. 4. The system of claim 3, wherein the controller is configured to determine at least one of the amplitude, the frequency, or the DC offset based on at least one of a battery type of the battery pack, the temperature associated with the battery pack, or a state of charge of the battery pack.
5. 5. The system of claim 1, wherein the alternating current has a frequency in the range of 80 hertz (Hz) to 500 Hz.
6. 6. The system of claim 1, wherein the alternating current has a magnitude in the range of 100 amps to 1000 amps.
7. 7. The system of claim 1, wherein the controller is configured to monitor the alternating current and send the updated request based on monitoring the alternating current.
8. 8. An electric vehicle comprising: A plurality of battery cells including a first battery cell, and A battery management system configured to: detecting conditions associated with the plurality of battery cells; in response to detecting the condition, sending a request to the charger, and Providing an alternating current associated with the request and received from the charger to at least the first battery cell such that the internal resistance of the first battery cell and the alternating current increase a temperature associated with the first battery cell.
9. 9. The electric vehicle of claim 8, wherein the condition comprises at least one of a temperature associated with the plurality of battery cells, a state of charge of the plurality of battery cells, or a battery type of the plurality of battery cells.
10. 10. The electric vehicle of claim 8, wherein the request specifies a direct current, DC, offset of the alternating current, and wherein the battery management system determines the DC offset based at least in part on temperatures associated with the plurality of battery cells.
11. 11. The electric vehicle of claim 10, wherein the battery management system is configured to provide the alternating current to the plurality of battery cells to charge at least one of the plurality of battery cells.
12. 12. The electric vehicle of claim 10, further comprising one or more other components, wherein the battery management system provides alternating current to power the one or more other components, and wherein the one or more other components include at least one of a drive unit, a compressor, or a power conversion system.
13. 13. The electric vehicle of claim 8, wherein the request specifies a magnitude of the alternating current and a DC offset, and wherein the battery management system is configured to determine the magnitude and the DC offset based at least in part on the condition.
14. 14. The electric vehicle of claim 8, wherein the battery management system is configured to: monitoring the amplitude of the alternating current to generate a monitoring signal; generating an updated request for adjusting the amplitude of the alternating current based on the monitoring signal, and The updated request is sent to the charger.
15. 15. A method for managing a battery pack, the method comprising: detecting a temperature associated with the battery pack; Transmitting a request to a charger based on the temperature, the request identifying an alternating current waveform, and At least a portion of the alternating current associated with the request and received from the charger is provided to at least a first battery cell of the battery pack such that heat is generated based on the internal resistance of the first battery cell to increase the temperature associated with the first battery cell.
16. 16. The method of claim 15, further comprising: Monitoring the amplitude of the alternating current to generate a monitoring signal, and An updated request is generated based on the monitoring signal and sent to the charger for adjusting the amplitude of the alternating current.
17. 17. The method of claim 15, further comprising: determining that the temperature associated with the battery pack meets a threshold, Wherein the request is sent in response to determining that the temperature associated with the battery pack satisfies the threshold.
18. 18. The method of claim 15, further comprising: Determining an amplitude, a frequency, and a DC offset based on at least one of a battery type of the battery pack, the temperature associated with the battery pack, and a state of charge of the battery pack, Wherein the alternating current waveform is indicative of the amplitude, the frequency, and the DC offset.
19. 19. The method of claim 15, further comprising: the alternating current is provided to power a drive unit, a compressor, or a power conversion system of the electric vehicle.
20. 20. The method of claim 15, wherein the alternating current has a frequency between 80Hz and 500 Hz.

Description

AC current pool heating Cross Reference to Related Applications The present application claims priority from U.S. patent application Ser. No. 19/244520, entitled "ALTERNATING CURRENT BATTERY HEATING", filed on day 20 at month 6 of 2025, which claims priority from U.S. provisional patent application Ser. No. 63/717,719, entitled "ALTERNATING CURRENT BATTERY HEATING", filed on day 7 at month 11 of 2024, the entire disclosures of both of which are incorporated herein by reference in their entireties, and for all purposes. Technical Field The present invention relates to a heating battery. More particularly, embodiments of the present disclosure relate to methods and systems for heating a battery pack using Alternating Current (AC). Background The electric vehicle may be degraded in cold weather conditions. For example, battery packs used in electric vehicles may face challenges when charged at low temperatures (e.g., below 0 ℃). Under certain low temperature conditions, the vehicle may not be able to charge the battery pack, which may result in excessive charging station waiting times, and some vehicles being completely powered down. In addition, charging at low temperatures can lead to cell degradation and lithium plating, which can affect the life and performance of the energy storage system. Disclosure of Invention The systems, methods, and apparatus of the present disclosure each have several innovative embodiments, none of which are solely responsible for all of the desirable attributes disclosed herein. The details of one or more implementations of the subject matter described in this specification are set forth in the accompanying drawings and the description below. In some aspects, the technology described herein relates to a system for managing a battery pack of an electric vehicle, the system including a sensor configured to detect a temperature associated with the battery pack, and a controller in communication with the sensor, the controller configured to send a request to a charger based on a sensor signal from the sensor, the request identifying an alternating current waveform, and to provide at least a portion of an alternating current associated with the request and received from the charger to at least a first battery cell of the battery pack, such that heat is generated based on an internal resistance of the first battery cell to increase the temperature associated with the first battery cell. In some aspects, the techniques described herein relate to a system in which a controller is configured to send the request to a charger in response to determining that a temperature associated with a battery pack satisfies a threshold based on a sensor signal. In some aspects, the techniques described herein relate to a system in which the request specifies at least one of an amplitude, a frequency, or a Direct Current (DC) offset of an alternating current. In some aspects, the techniques described herein relate to a system in which the controller is configured to determine at least one of an amplitude, a frequency, or a DC offset based on at least one of a battery type of the battery, a temperature associated with the battery, or a state of charge of the battery. In some aspects, the technology described herein relates to a system wherein the frequency of the alternating current is in the range of 80 hertz (Hz) to 500 Hz. In some aspects, the technology described herein relates to a system wherein the amplitude of the alternating current is in the range of 100 amps to 1000 amps. In some aspects, the techniques described herein relate to a system in which a controller is configured to monitor an alternating current and send an updated request based on monitoring the alternating current. In some aspects, the technology described herein relates to an electric vehicle that includes a plurality of battery cells including a first battery cell, and a battery management system configured to detect a condition associated with the plurality of battery cells, send a request to a charger in response to detecting the condition, and provide at least a portion of an alternating current associated with the request and received from the charger to at least the first battery cell such that an internal resistance and the alternating current of the first battery cell increase a temperature associated with the first battery cell. In some aspects, the technology described herein relates to an electric vehicle, wherein the condition includes at least one of a temperature associated with the plurality of battery cells, a state of charge of the plurality of battery cells, or a battery type of the plurality of battery cells. In some aspects, the technology described herein relates to an electric vehicle, wherein the request specifies a Direct Current (DC) offset of an alternating current, and wherein the battery management system determines the DC offset based at least in part on temperatures associated with the plurality of b