Energy storage system, temperature control method, and photovoltaic power generation system

Patent metadata

Field	Value
Publication number	US-12326743-B2
Application number	US-202318506619-A
Country	US
Kind code	B2
Filing date	Nov 10, 2023
Priority date	May 11, 2021
Publication date	Jun 10, 2025
Grant date	Jun 10, 2025

Abstract

In accordance with an embodiment, an energy storage system includes energy storage container that a temperature control system, a battery cluster, and a controller. The controller determines a specified temperature of the temperature control system corresponding to a maximum difference between an available capacity of the battery cluster and a power consumption of the temperature control system as a target temperature. The determination of the specified temperature is based on: a correspondence between the available capacity of the battery cluster and a plurality of different specified temperatures in a specified temperature set of the temperature control system, and a correspondence between the power consumption of the temperature control system and the plurality of different specified temperatures in the specified temperature set of the temperature control system. The temperature control system is configured to adjust a temperature inside the energy storage container to the target temperature.

First claim

What is claimed is:

1. An energy storage system, comprising:
at least one energy storage container, wherein each energy storage container comprises:
a battery cluster comprising a plurality of battery modules connected in series, wherein each battery module of the plurality of battery modules comprises a plurality of batteries;
a temperature control system configured to adjust a temperature inside the energy storage container to a target temperature; and
a controller configured to determine a specified temperature of the temperature control system corresponding to a maximum difference between an available capacity of the battery cluster and a power consumption of the temperature control system as the target temperature, wherein the determination of the specified temperature is based on:
a correspondence between the available capacity of the battery cluster and a plurality of different specified temperatures in a specified temperature set of the temperature control system, and
a correspondence between the power consumption of the temperature control system and the plurality of different specified temperatures in the specified temperature set of the temperature control system.

2. The energy storage system according to claim 1 , wherein a correspondence between available capacities of the battery cluster in different working states and the plurality of different specified temperatures in the specified temperature set of the temperature control system is pre-calibrated and stored.

3. The energy storage system according to claim 2 , wherein the controller is further configured to:
in response to the battery cluster being in a charging state, determine a correspondence between the available capacity of the battery cluster at a current charging rate and the plurality of different specified temperatures in the specified temperature set of the temperature control system;
in response to the battery cluster being in a discharging state, determine a correspondence between the available capacity of the battery cluster at a current discharging rate and the plurality of different specified temperatures in the specified temperature set of the temperature control system; and
in response to the battery cluster being in a silent state, determine a correspondence between the available capacity of the battery cluster in a current state of charge and the plurality of different specified temperatures in the specified temperature set of the temperature control system.

4. The energy storage system according to claim 1 , wherein:
the temperature control system comprises a plurality of air conditioners configured to adjust the temperature inside the energy storage container; and
a plurality of fans configured to adjust gas flow speeds around the plurality of battery modules, wherein the controller is further configured to:
determine a correspondence between a total power consumption of a turned-on air conditioner and the plurality of different specified temperatures in the specified temperature set of the temperature control system,
determine a total power consumption of a turned-on fan, and
determine the correspondence between the power consumption of the temperature control system and the plurality of different specified temperatures in the specified temperature set of the temperature control system based on the total power consumption of the turned-on fan and the correspondence between the total power consumption of the turned-on air conditioner and the plurality of different specified temperatures in the specified temperature set of the temperature control system.

5. The energy storage system according to claim 4 , wherein:
all of the plurality of fans are configured to be turned on; and
the controller is further configured to:
determine rotational speeds of the plurality of fans based on temperatures of the plurality of battery modules; and
determine a total power consumption of the plurality of fans based on a total quantity of the plurality of fans and the rotational speeds of the plurality of fans.

6. The energy storage system according to claim 4 , wherein the controller is specifically configured to:
determine a quantity of turned-on fans and rotational speeds of turned-on fans of the plurality of fans based on temperatures of the plurality of battery modules; and
determine a total power consumption of turned-on fans of the plurality of fans based on the quantity of turned-on fans and the rotational speeds of the turned-on fans.

7. The energy storage system according to claim 4 , wherein the controller is further configured to:
determine a correspondence between a total refrigerating capacity associated with the energy storage container and the plurality of different specified temperatures in the specified temperature set of the temperature control system;
determine a correspondence between a refrigerating capacity of one air conditioner and the plurality of different specified temperatures in the specified temperature set of the temperature control system;
determine a correspondence between a quantity of turned-on air conditioners and the plurality of different specified temperatures in the specified temperature set of the temperature control system based on the correspondence between the total refrigerating capacity required by the energy storage container and the plurality of different specified temperatures in the specified temperature set of the temperature control system and the correspondence between the refrigerating capacity of one air conditioner and the plurality of different specified temperatures in the specified temperature set of the temperature control system; and
determine the correspondence between the total power consumption of the turned-on air conditioner and the plurality of different specified temperatures in the specified temperature set of the temperature control system based on the correspondence between the quantity of turned-on air conditioners and the plurality of different specified temperatures in the specified temperature set of the temperature control system and a correspondence between a power consumption of one air conditioner and the plurality of different specified temperatures in the specified temperature set of the temperature control system.

8. The energy storage system according to claim 7 , wherein the controller is further configured to:
determine, based on solar radiation intensity and an outer surface area of the energy storage container, heat transferred by solar heat radiation to the inside of the energy storage container;
determine, based on a heat transfer coefficient of the energy storage container, the outer surface area of the energy storage container, and a current temperature outside the energy storage container, a correspondence between heat transferred from the outside of the energy storage container to the inside of the energy storage container through heat conduction and the plurality of different specified temperatures in the specified temperature set of the temperature control system;
determine, based on working time of the plurality of battery modules, working currents of the plurality of battery modules, internal resistances of the plurality of battery modules, and open circuit voltages of the plurality of battery modules, heat generated during working of the plurality of battery modules; and
determine, based on the heat transferred by solar heat radiation to the inside of the energy storage container, the correspondence between heat transferred from the outside of the energy storage container to the inside of the energy storage container through heat conduction and the plurality of different specified temperatures in the specified temperature set of the temperature control system,

Assignees

• Huawei Digital Power Tech Co Ltd

Inventors

• Ma Hui
• Wu Zhipeng
• Meng Hao
• Li Zhirun

Classifications

• H02J2101/24

  Photovoltaics · CPC title

• H02J7/975

  in response to temperature · CPC title

• H02J7/80

  including monitoring or indicating arrangements · CPC title

• H02J7/50

  acting upon multiple batteries simultaneously or sequentially · CPC title

• H02J7/977

  of the battery · CPC title