Granted Patent B2

US 12,368,330 · App. 17/794,336 · Granted Jul 22, 2025

Inventors: Jung Hoon Lee (Daejeon, KR); Moon Koo Chung (Daejeon, KR)

Assignee: LG ENERGY SOLUTION, LTD.

H02J50/80H01M10/4207H01M10/4257H01M50/289H02J7/00036H02J7/0014H02J7/0048H02J7/342H02J50/10H02J50/23H01M2010/4271H01M2010/4278

Abstract

Claims (91)

1. A battery management system, comprising:

a communication circuit configured to receive information on a first state of charge (SOC) of a first battery module, a second SOC of a second battery module, and a third SOC of a third battery module; and

a controller configured to control a first wireless charging between the first battery module and the second battery module and a second wireless charging between the second battery module and the third battery module for balancing the first SOC, the second SOC and the third SOC, based at least on a first efficiency parameter and a second efficiency parameter,

wherein the first wireless charging is to wirelessly transmit power from one of the first battery module and the second battery module to the other of the first battery module and the second battery module,

wherein the second wireless charging is to wirelessly transmit power from one of the second battery module and the third battery module to the other of the second battery module and the third battery module,

wherein the first efficiency parameter is determined based at least on a first wireless charging efficiency between the first battery module and the second battery module and a second wireless charging efficiency between the second battery module and the third battery module and based at least on a first relationship, and

wherein the second efficiency parameter is determined based at least on the first wireless charging efficiency and the second wireless charging efficiency and based at least on a second relationship different from the first relationship.

2. The battery management system of claim 1 , wherein the controller is further configured to control the first wireless charging and the second wireless charging such that a sum of an absolute value of a difference between the first SOC and the second SOC and an absolute value of a difference between the second SOC and the third SOC decreases.

3. The battery management system of claim 1 , wherein the first SOC is a sum of SOCs of first battery cells in the first battery module,

wherein the second SOC is a sum of SOCs of second battery cells in the second battery module, and

wherein the third SOC is a sum of SOCs of third battery cells in the third battery module.

4. The battery management system of claim 1 , wherein the second battery module is positioned between the first battery module and the third battery module.

5. The battery management system of claim 1 , wherein the controller is further configured to control the first wireless charging and the second wireless charging based on the first SOC, the second SOC, the third SOC, the first wireless charging efficiency between the first battery module and the second battery module, and the second wireless charging efficiency between the second battery module and the third battery module, and

wherein the first wireless charging efficiency is determined based on a distance between the first battery module and the second battery module, types of antennas for power transmission and reception of the first battery module and the second battery module, and the number of turns of coils constituting the antennas for power transmission.

6. The battery management system of claim 5 , wherein the controller is further configured to:

determine a first direction and a first magnitude of the first wireless charging, and a second direction and a second magnitude of the second wireless charging, according to a matrix equation,

control the first battery module or the second battery module such that, if the first direction is a negative number, power of the first magnitude is transmitted from the second battery module to the first battery module, and if the first direction is a positive number, the power of the first magnitude is transmitted from the first battery module to the second battery module, and

control the second battery module or the third battery module such that, if the second direction is a negative number, power of the second magnitude is transmitted from the third battery module to the second battery module, and if the second direction is a positive number, the power of the second magnitude is transmitted from the second battery module to the third battery module,

wherein the matrix equation is:

[

e

12

⁢

e

23

]

=

E

⁢

0

×

[

(

soc

⁢

1

-

soc

⁢

2

)

⁢

(

soc

⁢

2

-

soc

⁢

3

)

]

[

1

+

k

12

-

k

12

-

1

1

+

k

23

]

-

1

×

1

100

;

and

wherein E0 is a constant, a sign and a magnitude of e12 are respectively the first direction and the first magnitude, a sign and a magnitude of e23 are respectively the second direction and the second magnitude, soc1 is the first SOC, soc2 is the second SOC, soc3 is the third SOC, k12 is the first wireless charging efficiency, and k23 is the second wireless charging efficiency.

7. The battery management system of claim 6 , wherein E0 is determined by multiplying a capacity (Ah) of the first battery module by a driving voltage (V) of the first battery module.

8. The battery management system of claim 1 , wherein:

each of the first and second relationships is based at least on the first wireless charging efficiency, the second wireless charging efficiency, the first SOC, the second SOC, and the third SOC.

9. A battery management system, comprising:

a communication circuit configured to receive information on a first state of charge (SOC) of a first battery module and a second SOC of a second battery module; and

a controller configured to:

calculate first charging power based at least on a first wireless charging efficiency and a second wireless charging efficiency, wherein the first wireless charging efficiency is determined based on at least one of a distance between the first battery module and the second battery module, types of antennas for power transmission and reception of the first battery module and the second battery module, and the number of turns of coils constituting the antennas for power transmission; and

control, according to at least the calculated first charging power, first wireless charging between the first battery module and the second battery module for balancing between the first SOC and the second SOC,

wherein the first wireless charging is to wirelessly transmit power from one of the first battery module and the second battery module to the other of the first battery module and the second battery module.

10. A battery management system, comprising:

a communication circuit configured to receive information on a first state of charge (SOC) of a first battery module and a second SOC of a second battery module; and

a controller configured to control first wireless charging between the first battery module and the second battery module for balancing between the first SOC and the second SOC,

wherein the first wireless charging is to wirelessly transmit power from one of the first battery module and the second battery module to the other of the first battery module and the second battery module,

wherein:

the controller is further configured to control the first wireless charging based at least on a first wireless charging efficiency between the first battery module and the second battery module; and

the first wireless charging efficiency is different from a state of charge of a battery module.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (38)