BATTERY CHARGING BASED ON REAL-TIME BATTERY CHARACTERIZATION

• US 20170302088A1
• Filed: 04/10/2017
• Published: 10/19/2017
• Est. Priority Date: 04/08/2016
• Status: Active Grant

• Current Assignee: Gbatteries Energy Canada Inc.
• Original Assignee: Gbatteries Energy Canada Inc.
• Inventors: Tkachenko, Oleksandr, Sherstyuk, Mykola
• Granted Patent: US 10,291,048 B2
• Time in Patent Office: Days
• CPC Class Codes: H02J 7/0045 concerning the insertion or the connection of the batteries
• CPC Class Codes: H02J 7/0047 with monitoring or indicating devices or circuits
• CPC Class Codes: H02J 7/0048 Detection of remaining charge capacity or state of charge [SOC]
• CPC Class Codes: H02J 7/005 Detection of state of health [SOH]
• CPC Class Codes: H02J 7/00711 with introduction of pulses during the charging process

Abstract

A battery charging circuit can produce a pulsed charging current to charge a battery. During charging, without disconnecting the pulsed charging current from the battery, EIS measurements can be made. In other words, the pulsed charging current can serve double-duty, for battery charging and as a drive signal for the EIS measurements. The EIS measurements can be used to alter parameters of the pulsed charging current to improve battery life. In some instances, the parameters of the pulsed charging current can be momentarily changed for the purpose of making the EIS measurements, and then restored subsequent to making the measurements to parameters suitable for battery charging.

Claims

1. A method comprising:

connecting a power supply to a battery;

generating a pulse train comprising a plurality of pulses;

producing a pulsed charging current from the power supply by modulating the power supply with the pulse train, the battery thereby being charged by the pulsed charging current;

simultaneous with charging the battery with the pulsed charging current, making a plurality of measurements of current or voltage, or both current and voltage, of the battery; and

varying the pulsed charging current as the battery is being charged based on the plurality of measurements, including varying pulse lengths of the pulses that comprise the pulse train or pulse durations of the pulses that comprise the pulse train, or both the pulse lengths and the pulse durations of the pulses that comprise the pulse train.

2. The method of claim 1, wherein varying the pulsed charging current further includes varying pulse amplitudes of the pulses that comprise the pulse train.

3. The method of claim 1, wherein the plurality of measurements are made without disconnecting the pulsed charging current from the battery.

4. The method of claim 1, further comprising generating measurement-optimized pulses in the pulse train concurrent with making the plurality of measurements so that the measurements are based on a pulsed charging current that is produced from the measurement-optimized pulses.

5. The method of claim 4, wherein the measurement-optimized pulses comprise a pseudo-random binary pulse sequence, wherein the pulsed charging current produced using the pseudo-random binary pulse sequence is characterized as a form of band-limited white noise.

6. The method of claim 1, further comprising continuously making the plurality of measurements while the battery is receiving the pulsed charging current.

7. The method of claim 1, further comprising making the plurality of measurements intermittently during the time that the battery is receiving the pulsed charging current.

8. A circuit comprising:

a terminal for a connection to an external power supply;

a terminal for a connection to a battery;

a pulse train generator configured to generate a pulse train comprising a plurality of pulses; and

control logic operative to;

produce a pulsed charging current using the external power supply by modulating the external power supply with the pulse train, the battery thereby being charged by the pulsed charging current;

simultaneous with charging the battery with the pulsed charging current, make a plurality of measurements of current or voltage, or both current and voltage, of the battery; and

vary the pulsed charging current as the battery is being charged based on the plurality of measurements, including varying pulse lengths of the pulses that comprise the pulse train or pulse durations of the pulses that comprise the pulse train, or both the pulse lengths and the pulse durations of the pulses that comprise the pulse train.

9. The circuit of claim 8, wherein varying the pulsed charging current further includes varying pulse amplitudes of the pulses that comprise the pulse train.

10. The circuit of claim 8, wherein the plurality of measurements are made without disconnecting the pulsed charging current from the battery.

11. The circuit of claim 8, wherein the control logic is further configured to generate measurement-optimized pulses in the pulse train concurrent with making the plurality of measurements so that the measurements are based on a pulsed charging current that is produced from the measurement-optimized pulses.

12. The circuit of claim 11, wherein the measurement-optimized pulses comprise a pseudo-random binary pulse sequence, wherein the pulsed charging current produced using the pseudo-random binary pulse sequence is characterized as a form of band-limited white noise.

13. The circuit of claim 8, wherein the control logic is further configured to continuously make the plurality of measurements while the battery is receiving the pulsed charging current.

14. The circuit of claim 8, wherein the control logic is further configured to make the plurality of measurements intermittently during the time that the battery is receiving the pulsed charging current.

15. A circuit comprising:

means for connecting a power supply to a battery;

means for generating a pulse train comprising a plurality of pulses;

means for producing a pulsed charging current from the power supply by modulating the power supply with the pulse train, the battery thereby being charged by the pulsed charging current;

means, simultaneous with charging the battery with the pulsed charging current, for making a plurality of measurements of current or voltage, or both current and voltage, of the battery; and

means for varying the pulsed charging current as the battery is being charged based on the plurality of measurements, including varying pulse lengths of the pulses that comprise the pulse train or pulse durations of the pulses that comprise the pulse train, or both the pulse lengths and the pulse durations of the pulses that comprise the pulse train.