CN-224217534-U - Battery energy storage device based on two-phase liquid cooling technology

CN224217534UCN 224217534 UCN224217534 UCN 224217534UCN-224217534-U

Abstract

The utility model provides a battery energy storage device based on a two-phase liquid cooling technology, which is arranged in an energy storage cabinet and is divided into four parts, wherein the battery energy storage device comprises a battery chamber, an electric chamber and a control chamber, wherein the battery chamber is arranged on the right side of the lower part of the energy storage cabinet and comprises four battery modules, the electric chamber is arranged on the left side of the energy storage cabinet and comprises a PCS (personal digital System), a DC/DC (direct Current) and a direct Current high-voltage box, the control chamber is arranged in the middle of the upper part of the energy storage cabinet and comprises an operation indicator lamp, an energy management system, an emergency stop switch, a cold power supply switch and an energy management system control power supply switch, and the cooling chamber is arranged on the right side of the upper part of the energy storage cabinet and comprises a two-phase liquid cooling unit. The cooling pipeline is connected with the cold plate of the battery module in a downward conveying and upward returning mode, so that the cooling medium can fully absorb heat of the battery module, a large amount of heat is taken away through a phase change process, and the heat exchange efficiency is improved.

Inventors

LI ZHEN
Qu Yupan
YANG ZHIBO
WANG NAN
ZHOU XICHAO
PENG YONG
YANG BIN
WU SIFAN
HAO TIANYI
SUN WEIHUA

Assignees

国网综合能源服务集团有限公司

Dates

Publication Date: 20260508
Application Date: 20250417

Claims (10)

1. The utility model provides a battery energy storage device based on two-phase liquid cooling technique which characterized in that includes an energy storage cabinet at least, and it separates into four parts in space, includes: The battery chamber is positioned on the right side of the lower part of the energy storage cabinet and comprises four battery modules; the electric room is positioned at the left side of the energy storage cabinet and comprises a PCS, a DC/DC and a direct-current high-voltage box; The control chamber is positioned in the middle of the upper part of the energy storage cabinet and comprises an operation indicator lamp, an energy management system, an emergency stop switch, a cold power supply switch and an energy management system control power supply switch; The cooling chamber is positioned on the right side of the upper part of the energy storage cabinet and comprises a two-phase liquid cooling unit.
2. The battery energy storage device of claim 1, wherein a separator is provided between four portions of the battery energy storage device, the separator being made of a fire-resistant, insulating material and provided with a through-hole for the liquid cooling line and the wire harness to pass through; the two-phase liquid cooling unit has the functions of temperature monitoring and automatic regulation; the two-phase liquid cooling unit is connected with a cooling pipeline, and the cooling medium is pentafluoropropane.
3. The battery energy storage device of claim 2, wherein the cooling conduit is a copper tube; the top of the battery module is provided with a cold plate which is connected with a cooling pipeline; the cooling pipeline is connected with a cold plate of the battery module in a downward conveying and upward returning mode; The pipe sections of the cooling pipelines connected with the battery module cold plates are all provided with check valves; and a breather valve is arranged at the joint of the cooling pipeline and the liquid return port of the two-phase liquid cooling unit.
4. The battery energy storage device of claim 1, wherein the battery module comprises a battery assembly, a thermal management system, a battery management system, a safety protection assembly; The battery module is bound and fixed through a steel ribbon, and a high-strength insulating material is wrapped at the bottom of the battery module; the battery modules are connected by adopting deformed red copper bars and are connected in series by annealed copper wires; the battery assembly consists of 30 cells connected in series.
5. The battery energy storage device of claim 4, wherein said thermal management system comprises a two-phase liquid cooled panel and a temperature sensor; The safety protection component takes perfluorinated hexanone as a fire extinguishing medium, is provided with a four-in-one high-sensitivity fire-fighting sensor, monitors key indexes of carbon monoxide, volatile organic compounds, temperature and smoke in real time, and transmits the values to the energy management system through a CAN bus in real time.
6. The battery energy storage device of claim 4, wherein said battery management system is divided into two levels of architecture, comprising: The battery management unit is responsible for collecting the data of the voltage, the temperature and the pressure of each single cell in the battery box, and uploading the data to the battery cabinet cluster management unit through a daisy chain after processing the data; The battery cabinet cluster management unit is positioned in the direct-current high-voltage box, receives information from the battery management unit, detects voltage and current of the battery clusters, processes data and uploads the processed data to the energy management system through the CAN bus.
7. The battery energy storage device of claim 1, wherein the energy management system is integrated in real time with each subsystem in the energy storage device, including a battery management system, a cooling system, and a safety protection system, to monitor the operational status of each component in the energy storage device; The energy management system collects voltage, current, temperature and pressure data of the battery module, operation parameters of the cooling system and monitoring data of the safety protection component in a CAN bus communication mode; the energy management system detects abnormal conditions in the energy storage device in real time and gives an alarm in time; The energy management system triggers an emergency stop switch when serious faults or potential safety hazards are detected; The energy management system is provided with a display module for displaying equipment operation parameters, fault information and historical data; The energy management system stores historical data of device operation.
8. The battery energy storage device of claim 1, wherein the PCS is used for ac-dc conversion of current between the battery and the grid; The DC/DC realizes the voltage boosting or the voltage reducing of direct current through a high-frequency switching technology; The DC/DC is connected with the PCS through a direct current positive-stage wire harness and a direct current negative-stage wire harness.
9. The battery energy storage device of claim 1, wherein the DC high voltage box includes power distribution, protection, safety isolation and current detection functions, is connected to the battery compartment by a DC positive-stage harness and a DC negative-stage harness, and is connected to the DC/DC by a DC positive-stage harness and a DC negative-stage harness.
10. The battery energy storage device of claim 1, wherein the operation indicator light comprises a plurality of color indicator lights, different colors corresponding to normal operation, warning status and fault status, respectively; The energy management system is provided with a display module for displaying equipment operation parameters and fault information and performing related control operation on the equipment; The Leng Jidian source switch and the energy management system control power switch are used for controlling the cold machine power supply and the energy management system control power supply to be switched on and off; The emergency stop switch is used for stopping equipment operation in an emergency situation and has obvious identification and protective measures.

Description

Battery energy storage device based on two-phase liquid cooling technology Technical Field The utility model belongs to the technical field of energy storage, and mainly relates to a battery thermal management system applied to an electrochemical energy storage system, in particular to a battery energy storage device based on a two-phase liquid cooling technology, which aims to provide a high-efficiency and uniform heat dissipation solution for the battery module, so that the safe and stable operation of the energy storage system is ensured, and the service life and the system performance of a battery are improved. Background With the rapid development of electrochemical energy storage technology represented by lithium ion batteries, the lithium ion battery is widely applied to the fields of peak regulation and frequency modulation of power systems, renewable energy grid connection, distributed energy systems and the like. However, as energy storage systems move toward high capacity, high power density, battery thermal management issues become increasingly prominent, becoming a critical factor limiting energy storage system performance and lifetime. The battery can generate a large amount of joule heat in the working process, and particularly, the heat accumulation is more remarkable under the high-rate charge and discharge working condition. Traditional forced air cooling or single-phase liquid cooling mode is difficult to satisfy the heat dissipation demand of high-power energy storage device because of limited heat dissipation efficiency. The air cooling system has the problems of uneven heat dissipation, high energy consumption, high noise and the like, and the single-phase liquid cooling system has a higher heat exchange coefficient, but is still insufficient in coping with the problem of local overheating of the battery pack. The two-phase liquid cooling technology is used as a novel efficient heat dissipation mode, and heat dissipation efficiency can be remarkably improved by utilizing the phase change heat absorption characteristic of a cooling medium. The technology utilizes the characteristic that the cooling medium absorbs a large amount of latent heat in the phase change process, and can realize higher heat flux density and more uniform temperature distribution. However, the application of the existing two-phase liquid cooling technology in the energy storage field still faces many challenges, including firstly, complex flow and heat transfer characteristics of two-phase fluid, difficult precise control, secondly, special structure and working environment of a battery module need to be considered in system design, and thirdly, a reliable temperature monitoring and intelligent regulation system needs to be developed to ensure safe and stable operation of the system. In view of the above problems, the present utility model provides a battery energy storage device based on a two-phase liquid cooling technology. The device combines intelligent temperature monitoring and adjusting functions through optimizing the designs of the two-phase liquid cooling unit and the cooling pipeline, and achieves efficient and uniform heat dissipation effect. Disclosure of Invention The utility model aims to provide a battery energy storage device based on a two-phase liquid cooling technology, which is used for solving the problems that the traditional air cooling or single-phase liquid cooling mode is difficult to meet the heat dissipation requirement of a high-power energy storage device, and particularly under a high-load working condition, uneven heat dissipation can cause excessive temperature of a battery, so that thermal runaway and even safety accidents are caused, and the existing two-phase liquid cooling system is difficult to combine with the energy storage device. In order to solve the above problems, the present utility model provides a battery energy storage device based on a two-phase liquid cooling technology, which at least comprises an energy storage cabinet spatially divided into four parts, respectively: The battery chamber is positioned on the right side of the lower part of the energy storage cabinet and comprises four battery modules; The electric room is positioned at the left side of the energy storage cabinet and comprises a PCS (power conversion system), a DC/DC (direct current/direct current) high-voltage box; The control chamber is positioned in the middle of the upper part of the energy storage cabinet and comprises an operation indicator lamp, an energy management system, an emergency stop switch, a cold power supply switch and an energy management system control power supply switch; The cooling chamber is positioned on the right side of the upper part of the energy storage cabinet and comprises a two-phase liquid cooling unit. Preferably, a partition board is arranged between the four parts of the battery energy storage device, the partition board is made of fireproof and insulating ma