# US 12,119,682 B2 · Method and apparatus for controlling energy storage system

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- Number: US 12,119,682 B2
- Document ID: US12119682B2
- Status: Granted
- Kind: B2
- Application number: 17/478,887
- Filed: 2021-09-18
- Published: 2022-01-06
- Granted: 2024-10-15
- Earliest claimed: 2019-03-21
- Assignees: Contemporary Amperex Technology Co., Limited
- Applicants: Contemporary Amperex Technology Co., Limited
- Inventors: Ruirui You; Xiaowei Yang
- Web page: https://patentgrep.com/patent/US12119682B2

## CPC

- H02J 7/52: for charge balancing, e.g. equalisation of charge between batteries
- G05B 15/02: electric
- H02J 7/56: Active balancing, e.g. using capacitor-based, inductor-based or DC-DC converters
- H02J 7/70: characterised by the mechanical construction
- H02J 7/82: Control of state of charge [SOC]
- H02M 1/32: Means for protecting converters other than automatic disconnection
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- G05B: CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS (systems for controlling or regulating non-electric variables G05D; systems for regulating electric or magnetic variables G05F; control devices or systems insofar as characterised by mechanical features only G05G)
- H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P)

## Abstract

An embodiment of this application provides an energy storage system, and a method and an apparatus for controlling the energy storage system. The method includes: selecting a plurality of target modules from all modules contained in an electric cabinet, where a voltage of each of the plurality of target modules is greater than or equal to a voltage of a remaining module; and controlling a DC-DC circuit of the plurality of target modules to increase an output voltage. The technical solution provided in the embodiment of this application can solve the problem that state-of-charge (SOC) imbalance between different modules affects performance of the energy storage system.

## Claims

### Claim 1

A method for controlling an energy storage system, wherein the energy storage system comprises an electric cabinet, and the method comprises:
selecting a plurality of target modules from all modules contained in the electric cabinet, wherein a voltage of each of the plurality of target modules is greater than or equal to a voltage of a remaining module; and
controlling a DC-DC circuit of the plurality of target modules to increase an output voltage,
wherein the selecting of the plurality modules from all modules contained in the electric cabinet comprises:
calculating a first quantity according to a quantity of all modules contained in the electric cabinet, a current consumed by a controller area network (CAN) transceiver of a cell supervision circuit (CSC) of each module, a maximum power generation current of the CSC of each module, and a current of a slave battery management unit (SBMU); and
determining, in a case that the first quantity is less than a preset quantity threshold, that a quantity of the selected target modules is the preset quantity threshold; or
determining, in a case that the first quantity is greater than or equal to a preset quantity threshold, that a quantity of the selected target modules is the first quantity.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the calculating a first quantity according to a quantity of all modules contained in the electric cabinet, a current consumed by a CAN transceiver of a CSC of each module, a maximum power generation current of the CSC of each module, and a current of an SBMU comprises:
calculating the first quantity according to a formula M=(I1×N+Is+const)/I2, wherein M denotes the first quantity, I1 denotes the current consumed by the CAN transceiver of the CSC of each module, N denotes the quantity of modules contained in the electric cabinet, Is denotes the current of the SBMU, const denotes a constant, and I2 denotes the maximum power generation current of the CSC of each module.

### Claim 3 (depends on 1)

The method according to claim 1, wherein after the controlling a DC-DC circuit of the plurality of target modules to increase an output voltage, the method further comprises:
reselecting a target module according to a current voltage of the modules; and
controlling a DC-DC circuit of the reselected target module to increase the output voltage.

### Claim 4

An apparatus for controlling an energy storage system, wherein the energy storage system comprises an electric cabinet, and the apparatus comprises:
a selection unit, configured to select a plurality of target modules from all modules contained in the electric cabinet, wherein a voltage of each of the plurality of target modules is greater than or equal to a voltage of a remaining module; and
a control unit, configured to control a DC-DC circuit of the plurality of target modules to increase an output voltage,
wherein the selection unit comprises:
a calculation subunit, configured to calculate a first quantity according to a quantity of all modules contained in the electric cabinet, a current consumed by a controller area network (CAN) transceiver of a cell supervision circuit (CSC) of each module, a maximum power generation current of the CSC of each module, and a current of a slave battery management unit (SBMU);
a first determining subunit, configured to determine, in a case that the first quantity is less than a preset quantity threshold, that a quantity of the selected target modules is the preset quantity threshold; and
a second determining subunit, configured to determine, in a case that the first quantity is greater than or equal to a preset quantity threshold, that a quantity of the selected target modules is the first quantity.

### Claim 5 (depends on 4)

The apparatus according to claim 4, wherein the calculation subunit is configured to:
calculate the first quantity according to a formula M=(I1×N+Is+const)/I2, wherein M denotes the first quantity, I1 denotes the current consumed by the CAN transceiver of the CSC of each module, N denotes the quantity of modules contained in the electric cabinet, Is denotes the current of the SBMU, const denotes a constant, and I2 denotes the maximum power generation current of the CSC of each module.

### Claim 6

An energy storage system, wherein the energy storage system comprises an electric cabinet, and the electric cabinet comprises:
a slave battery management unit (SBMU); and
a plurality of modules, each of the plurality of modules being connected to the SBMU, wherein
each of the plurality of modules comprises a cell supervision circuit (CSC), and each CSC comprises:
a DC-DC circuit;
a low-dropout linear regulator; and
an internal circuit,
wherein a plurality of target modules are selected from the plurality of modules and a DC-DC circuit of the plurality of target modules is controlled to increase an output voltage, wherein a voltage of each of the plurality of target modules is greater than or equal to a voltage of a remaining module, and
wherein the plurality of target modules are selected by:
calculating a first quantity according to a quantity of all modules contained in the electric cabinet, a current consumed by a controller area network (CAN) transceiver of the cell supervision circuit (CSC) of each module, a maximum power generation current of the CSC of each module, and a current of the slave battery management unit (SBMU); and
determining, in a case that the first quantity is less than a preset quantity threshold, that a quantity of the selected target modules is the preset quantity threshold; or
determining, in a case that the first quantity is greater than or equal to a preset quantity threshold, that a quantity of the selected target modules is the first quantity.