EP-4738529-A1 - ENERGY STORAGE SYSTEM AND ENERGY STORAGE POWER STATION

EP4738529A1EP 4738529 A1EP4738529 A1EP 4738529A1EP-4738529-A1

Abstract

Provided in the present application are an energy storage system (1000) and an energy storage power station. The energy storage system (1000) comprises a battery module (100), a converter (200) and a cooling device (300), wherein a cooling unit (310) of the cooling device (300) is connected to a first liquid inlet (111) and a second liquid outlet (212) by means of pipelines. A bypass structure (320) is configured to be in communication with a first liquid outlet (112) and a second liquid inlet (211), and can bypass part of a coolant, which is discharged from the first liquid outlet (112), to the outside of the second liquid inlet (211); therefore, only part of the coolant enters a second cooling structure (210) from a first cooling structure (110), such that only using one cooling device (300) can meet different flow requirements of both the first cooling structure (110) and the second cooling structure (210), thereby effectively reducing the cost of the energy storage system (1000).

Inventors

LI, XIN
CHEN, XIAOBO
WANG, XUEHUI

Assignees

Contemporary Amperex Technology Co., Limited

Dates

Publication Date: 20260506
Application Date: 20230727

Claims (11)

An energy storage system, comprising: a battery module, wherein the battery module comprises a first cooling structure, the first cooling structure having a first liquid inlet and a first liquid outlet; a converter, wherein the converter comprises a second cooling structure, the second cooling structure having a second liquid inlet and a second liquid outlet; and a cooling device, wherein the cooling device comprises a cooling unit and a bypass structure, wherein: a liquid outlet end of the cooling unit is connected to the first liquid inlet through a pipeline, and a liquid inlet end of the cooling unit is connected to the second liquid outlet through a pipeline; and the bypass structure is configured to communicate the first liquid outlet with the second liquid inlet and to bypass a portion of a cooling liquid discharged from the first liquid outlet to outside the second liquid inlet.
The energy storage system according to claim 1, wherein the bypass structure has a bypass end connected to the liquid inlet end of the cooling unit.
The energy storage system according to claim 2, wherein the bypass structure is a three-way valve comprising a first valve port, a second valve port, and a third valve port, wherein the first valve port is connected to the first liquid outlet, the second valve port is connected to the second liquid inlet, and the third valve port is the bypass end and is connected to the liquid inlet end of the cooling unit.
The energy storage system according to any one of claims 1 to 3, wherein the cooling device further comprises a hydraulic adjustment mechanism configured to be capable of adjusting a hydraulic pressure difference between the cooling liquid in the first cooling structure and the cooling liquid in the second cooling structure.
The energy storage system according to claim 4, wherein the hydraulic adjustment mechanism comprises a spacer block, wherein: in a direction of gravity, when the spacer block is configured to be disposed at a bottom of the first cooling structure, a height of the first cooling structure is greater than a height of the second cooling structure; or in the direction of gravity, when the spacer block is configured to be disposed at a bottom of the second cooling structure, a height of the second cooling structure is greater than a height of the first cooling structure.
The energy storage system according to claim 5, wherein the spacer block is insulative.
The energy storage system according to claim 4, wherein the hydraulic adjustment mechanism comprises a pressure reduction structure disposed between the second liquid inlet and the first liquid outlet.
The energy storage system according to claim 4 or 7, wherein the hydraulic adjustment mechanism comprises a pressure boosting structure disposed between the liquid outlet end of the cooling unit and the first liquid inlet.
The energy storage system according to claim 4, wherein the hydraulic adjustment mechanism comprises a pressure boosting structure disposed between the second liquid inlet and the first liquid outlet.
The energy storage system according to claim 4 or 9, wherein the hydraulic adjustment mechanism comprises a pressure reduction structure disposed between the liquid outlet end of the cooling unit and the first liquid inlet.
An energy storage power station, comprising at least the energy storage system according to any one of claims 1 to 10.

Description

This application claims priority to Chinese Patent Application No. 202321658256.2, filed on June 28, 2023 and entitled "ENERGY STORAGE SYSTEM AND ENERGY STORAGE POWER STATION," which is incorporated herein by reference in its entirety. TECHNICAL FIELD This application relates to the technical field of cooling for energy storage systems, and in particular, provides an energy storage system and an energy storage power station. BACKGROUND ART An energy storage system mainly includes devices such as a battery module and a converter. The devices such as the battery module and the converter generate heat during operation, requiring a cooling system to dissipate the heat. In the related art, due to the different flow rate and pressure requirements of the cooling liquid for a battery module and a converter in an energy storage power station, two separate cooling systems are needed to meet different flow rate and pressure requirements of the cooling liquid, resulting in high development and manufacturing costs for energy storage systems. SUMMARY OF THE APPLICATION The purpose of the embodiments of this application is to provide an energy storage system and an energy storage power station, aiming to address the issue in the related art that a battery module and a converter of an energy storage system require two cooling systems due to different cooling liquid flow requirements, leading to high costs. The technical solution adopted by the embodiments of this application is as follows: In a first aspect, an embodiment of this application provides an energy storage system, including a battery module, a converter, and a cooling device. The battery module includes a first cooling structure, and the first cooling structure has a first liquid inlet and a first liquid outlet. The converter includes a second cooling structure, and the second cooling structure has a second liquid inlet and a second liquid outlet. The cooling device includes a cooling unit and a bypass structure. A liquid outlet end of the cooling unit is connected to the first liquid inlet through a pipeline, and a liquid inlet end of the cooling unit is connected to the second liquid outlet through a pipeline. The bypass structure is configured to communicate the first liquid outlet with the second liquid inlet, and the bypass structure is further configured to bypass a portion of a cooling liquid discharged from the first liquid outlet to outside the second liquid inlet. The beneficial effects of the embodiments of this application are as follows: In the energy storage system provided by the embodiments of this application, the cooling unit can introduce the cooling liquid to make it sequentially flow through the first cooling structure and the second cooling structure to respectively dissipate heat from the battery module and the converter. After the cooling liquid is discharged from the first liquid outlet of the first cooling structure, a portion of the cooling liquid can be bypassed by the bypass structure to outside the second liquid inlet. Therefore, only a portion of the cooling liquid discharged from the first cooling structure can enter the second cooling structure through the second liquid inlet, meaning that the flow rate of the cooling liquid passing through the second cooling structure is less than the flow rate of the cooling liquid passing through the first cooling structure. The different flow rate requirements of the first cooling structure and the second cooling structure can both be met, allowing only a single cooling device to supply the cooling liquid to the first cooling structure of the battery module and the second cooling structure of the converter for the cooling purpose. Thus, there is no need to use two cooling devices to individually supply the cooling liquid to the first cooling structure of the battery module and the second cooling structure of the converter, thereby effectively reducing the cost of the energy storage system. In some embodiments, the bypass structure has a bypass end, and the bypass end is connected to the liquid inlet end of the cooling unit. By adopting the above technical solution, the bypass end of the bypass structure can bypass a portion of the cooling liquid discharged from the first liquid outlet of the first cooling structure to the liquid inlet end of the cooling unit, so that this portion of the cooling liquid flows directly from the first cooling structure back to the cooling unit for cooling and circulation. In some embodiments, the bypass structure is a three-way valve, and the three-way valve includes a first valve port, a second valve port, and a third valve port. The first valve port is connected to the first liquid outlet, the second valve port is connected to the second liquid inlet, the third valve port is the bypass end, and the third valve port is connected to the liquid inlet end of the cooling unit. By adopting the above technical solution, the bypass structure is a three-way valve, with