Electric vehicle battery system control strategy incorporating active cell temperature balancing

Patent metadata

Field	Value
Publication number	US-12479334-B2
Application number	US-202318463464-A
Country	US
Kind code	B2
Filing date	Sep 8, 2023
Priority date	Sep 8, 2023
Publication date	Nov 25, 2025
Grant date	Nov 25, 2025

Abstract

Control strategies for an electric vehicle battery system that incorporate active cell temperature balancing are described. In an example, a method comprises employing, by a system operatively coupled to at least one processor, a smartcell battery system to supply power to one or more electrical systems of a vehicle, the smart cell battery system comprising a plurality of battery cells. The method further comprises controlling, by the system, operations of the battery cells in accordance with a control protocol that results in increasing a temperature of a subset of the battery cells based on the temperature being below a threshold temperature. In an example, the control protocol can include circulating current between the subset of battery cells and/or other battery cells excluded from the subset, actively discharging the subset of battery cells and redistributing the power to other battery cells excluded from the subset, and others.

First claim

What is claimed is:

1 . A method, comprising:
employing, by a system operatively coupled to at least one processor, a smartcell battery system to supply power to one or more electrical systems of a vehicle, the smartcell battery system comprising a plurality of battery cells; and controlling, by the system, operations of the battery cells in accordance with a control protocol that results in increasing a temperature of a subset of the battery cells based on the temperature being below a threshold temperature, wherein the control protocol comprises charging one or more first battery cells included in the subset, wherein the charging comprises:
withdrawing pulsed amounts of first electrical current having between about 200 Amperes (Amps) and about 500 Amps from one or more second battery cells excluded from the subset, and supplying the pulsed amounts of first electrical current to one or more first battery cells included in the subset, the pulsed amounts of first electrical current corresponding to respective amounts of the first electrical current withdrawn from the one or more second battery cells over respective pulse durations of less than 1.0 second.

2 . The method of claim 1 , wherein the control protocol further comprises circulating second electrical current between respective battery cells included in the subset.

3 . The method of claim 2 , wherein the circulating comprises circulating pulsed amounts of the second electrical current between the respective battery cells, the pulsed amounts of the second electrical current corresponding to respective amounts of the second electrical current extracted from or supplied to the respective battery cells over respective pulse durations of less than 1.0 second.

4 . The method of claim 3 , wherein the second electrical current comprises a high electrical current having between about 200 Amperes (Amps) and about 500 Amps.

5 . The method of claim 1 , wherein the control protocol further comprises circulating second electrical current between the one or more first battery cells included in the subset and the one or more second battery cells excluded from the subset.

6 . The method of claim 5 , wherein the circulating comprises circulating pulsed amounts of the second electrical current between the one or more first battery cells and the one or more second battery cells, the pulsed amounts of the second electrical current corresponding to respective amounts of the second electrical current extracted from or supplied to the one or more first battery cells or the one or more second battery cells over respective pulse durations of less than 1.0 second.

7 . The method of claim 6 , wherein the second electrical current comprises a high electrical current having between about 200 Amperes (Amps) and about 500 (Amps).

8 . The method of claim 1 , wherein the control protocol further comprises discharging one or more battery cells included in the subset.

9 . The method of claim 8 , wherein the discharging comprises withdrawing pulsed amounts of second electrical current having between about 200 Amperes (Amps) and about 500 Amps from the one or more battery cells, the pulsed amounts of the second electrical current corresponding to respective amounts of the second electrical current withdrawn from the one or more battery cells over respective pulse durations of less than 1.0 second.

10 . The method of claim 9 , wherein the control protocol further comprises providing the pulsed amounts of the second electrical current to one more other battery cells excluded from the subset.

11 . The method of claim 1 , further comprising:
controlling, by the system, charging of the battery cells using an external charging apparatus based on respective temperatures of the battery cells, wherein controlling the charging comprises limiting a charging rate of one or more battery cells based on the respective temperatures of the one or more battery cells being below the threshold temperature.

12 . A system, comprising:
a smartcell battery system configured to supply power to one or more electrical systems of an electric vehicle, the smartcell battery system comprising a plurality of battery cell units respectively comprising local controllers that control operations of respective battery cells connected to the local controllers; a memory that stores computer-executable components; and a processor that executes the computer-executable components stored in the memory, wherein the computer-executable components comprise:
a master control component that directs one or more of the local controllers to control an operation of the respective battery cells connected thereto in accordance with a control protocol that results in increasing a temperature of a subset of the battery cells based on the temperature being below a threshold temperature, wherein the control protocol comprises charging one or more first battery cells included in the subset, wherein the charging comprises:
withdrawing pulsed amounts of first electrical current having between about 200 Amperes (Amps) and about 500 Amps from one or more second battery cells excluded from the subset, and supplying the pulsed amounts of first electrical current to one or more first battery cells included in the subset, the pulsed amounts of first electrical current corresponding to respective amounts of the first electrical current withdrawn from the one or more second battery cells over respective pulse durations of less than 1.0 second.

13 . The system of claim 12 , wherein the control protocol further comprises circulating second electrical current between respective battery cells included in the subset.

14 . The system of claim 13 , wherein the circulating comprises circulating pulsed amounts of the second electrical current between the respective battery cells, the pulsed amounts of the second electrical current corresponding to respective amounts of the second electrical current extracted from or supplied to the respective battery cells over respective pulse durations of less than 1.0 second, and wherein the second electrical current comprises a high electrical current having between about 200 Amperes (Amps) and about 500 Amps.

15 . The system of claim 12 , wherein the control protocol further comprises circulating second electrical current between the one or more first battery cells included in the subset and the one or more second battery cells excluded from the subset.

16 . The system of claim 15 , wherein the circulating comprises circulating pulsed amounts of the second electrical current between the one or more first battery cells and the one or more second battery cells, the pulsed amounts of the second electrical current corresponding to respective amounts of the second electrical current extracted from or supplied to the one or more first battery cells or the one or more second battery cells over respective pulse durations of less than 1.0 second, and wherein the second electrical current comprises a high electrical current having between about 200 Amperes (Amps) and about 500 (Amps).

17 . The system of claim 12 , wherein the control protocol further comprises a first control protocol, and wherein the master control component directs the local controllers to control charging of the respective battery cells using an external charging circuit based on respective temperatures of the battery cells and in accordance with a second control protocol, wherein the second control protocol comprises reducing a charging rate of one or more battery cells based on the respective temperatures o

Assignees

• Volvo Car Corp

Inventors

• Forssell Jonas
• Ekström Markus
• Singh Aditya Pratap

Classifications

• H02J7/977

  of the battery · CPC title

• H02J7/927

  with introduction of pulses during the charging process · CPC title

• H02J7/875

  Charging or discharging for charge maintenance, battery initiation or rejuvenation · CPC title

• H02J7/50

  acting upon multiple batteries simultaneously or sequentially · CPC title

• H01M2010/4278

  Systems for data transfer from batteries, e.g. transfer of battery parameters to a controller, data transferred between battery controller and main controller · CPC title