Battery management system

Patent metadata

Field	Value
Publication number	US-11460511-B2
Application number	US-201916279707-A
Country	US
Kind code	B2
Filing date	Feb 19, 2019
Priority date	Feb 20, 2018
Publication date	Oct 4, 2022
Grant date	Oct 4, 2022

Abstract

A battery management system is provided. According to an embodiment of the present disclosure, the battery management system for managing a battery pack including a plurality of battery modules may include a plurality of individual battery management units respectively corresponding to the plurality of battery modules and a management module configured to integrally manage the plurality of individual battery management units, wherein each of the individual battery management units includes a state-of-health (SOH) calculator to calculate SOH of each of the plurality of battery modules and a state-of-charge (SOC) calculator to calculate SOC of each of the plurality of battery modules, the management module manages a performance state of all of the plurality of battery modules on the basis of the SOH and SOC of each battery module and the SOC of each battery module is corrected by the SOH of each battery module.

First claim

What is claimed is:

1. A battery management system for managing a battery pack including a plurality of battery modules, the battery management system comprising:
a plurality of individual battery management units respectively corresponding to the plurality of battery modules; and
a management processor configured to integrally manage the plurality of individual battery management units,
wherein each of the individual battery management units includes:
a state-of-health (SOH) processor configured to calculate an SOH of each of the plurality of battery modules and a state-of-charge (SOC) processor configured to calculate an SOC of each of the plurality of battery modules;
wherein the management processor is configured to manage a performance state of the plurality of battery modules based on the SOH and SOC of each of the plurality of battery modules, and
the SOC of each of the plurality of battery modules is corrected by the SOH of each of the plurality of battery modules, and
wherein the management processor is configured to determine a most deteriorated battery module among the plurality of battery modules, and manage the performance state of the plurality of battery modules based on the determined most deteriorated battery module,
wherein the SOC of each of the plurality of battery modules is calculated based on a battery circuit model,
wherein the battery circuit model is represented by one capacitor and two resistors,
wherein the SOC processor is configured to calculate an open circuit voltage of each of the plurality of battery modules using the following equation:

V
=

OCV
⁢

+

I
·

R
1

+

∫

(

I
C

-

V
RC

RC

)

⁢
d
⁢

⁢
t

wherein V denotes a battery voltage, OCV denotes the open circuit voltage, I denotes a current, R 1 denotes a resistance that varies as a battery deteriorates, C denotes a set capacitance, and R denotes a set resistance.

2. The battery management system of claim 1 , wherein the management processor is configured to set usable capacity of each of the plurality of battery modules based on the SOH and SOC of each of the plurality of battery modules.

3. The battery management system of claim 1 , wherein the SOH of each of the plurality of battery modules is calculated through SOH for battery capacity and SOH for a resistance increase in a battery.

4. The battery management system of claim 1 , wherein a value of the OCV is corrected by an SOH value for battery capacity that is calculated for each of the plurality of battery modules.

5. The battery management system of claim 4 , wherein the SOC of each of the plurality of battery modules is calculated from an SOC-OCV table based on the corrected OCV value.

6. The battery management system of claim 1 , wherein a value of I·R 1 is corrected by an SOH value for a resistance increase in a battery that is calculated for each of the plurality of battery modules.

7. The battery management system of claim 1 , wherein a voltage and an output of each of the plurality of battery modules are predicted from the battery circuit model.

8. A battery management system for managing a battery pack including a plurality of battery modules, the battery management system comprising:
a plurality of individual battery management units respectively corresponding to the plurality of battery modules; and
a management processor configured to integrally manage the plurality of individual battery management units,
wherein each of the individual battery management units includes:
a state-of-health (SOH) processor configured to calculate an SOH of each of the plurality of battery modules and a state-of-charge (SOC) processor configured to calculate an SOC of each of the plurality of battery modules;
wherein the management processor is configured to manage a performance state of the plurality of battery modules based on the SOH and SOC of each of the plurality of battery modules, and
the SOC of each of the plurality of battery modules is corrected by the SOH of each of the plurality of battery modules,
wherein the SOH of each of the plurality of battery modules is calculated through SOH for battery capacity,
wherein the SOH for battery capacity is calculated by the following equation:

SOH
C

=

Capacity_ini
⁢

⁢

(

1
-

(

e

a
⁡

(
1
)

+

a
⁡

(
2
)

T

·

t

a
⁡

(
3
)

)

)

wherein SOH C denotes SOH for the battery capacity, Capacity_ini denotes the initial battery capacity, t denotes the battery usage time (seconds), T denotes the battery temperature (K), and a(1), a(2), and a(3) denote relation constants.

9. A battery management system for managing a battery pack including a plurality of battery modules, the battery management system comprising:
a plurality of individual battery management units respectively corres

Assignees

• Sk Innovation Co Ltd

Inventors

• Kim Eun Young
• Lee Byung Eun
• Jeong Ha Chul
• Choi Young Lim

Classifications

• H01M10/482

  for several batteries or cells simultaneously or sequentially · CPC title

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• B60Y2200/91

  Electric vehicles · CPC title

• Y02T90/12

  Electric charging stations · CPC title

• B60L53/665

  Methods related to measuring, billing or payment · CPC title