CN-122025903-A - High-safety battery energy storage device and thermal management method thereof

Abstract

The invention discloses a high-safety battery energy storage device and a thermal management method thereof, and relates to the technical field of energy storage temperature control. The device has the advantages of simple structure, convenient use and low maintenance cost, and under normal conditions, the cooling liquid flows through the inside of the battery pack through the pipeline to exchange heat with the battery body, so that the heat generated by the battery is taken away. When the energy storage device is abnormally warmed, the control module controls the cooling liquid circulation system to increase heat exchange efficiency, so that the temperature difference is restored to be within a set value. By controlling the opening of the electromagnetic valve on the inlet pipeline or the outlet pipeline, the accurate temperature control of the single battery pack can be realized. When the power of the pump is increased and the temperature difference is continuously increased to exceed the threshold value, the control module cuts off the power supply of the battery energy storage device and the cooling liquid circulation system, and opens the gas circulation system to enable the inert gas to fill the whole circuit, so that the battery is in the inert gas atmosphere while the heat generated by the battery is taken away by the inert gas, and the combustion risk is reduced.

Inventors

• YU ZHENZHEN
• CHEN YONG
• HOU YAN
• LUO RUI
• WANG YINGQI

Assignees

• 河南水投绿色能源开发有限公司

Dates

Publication Date

20260512

Application Date

20251227

Claims (10)

1. 1. A high security battery energy storage device, comprising: The battery pack (1), a cooling liquid circulation system, a gas circulation system and a control module; The battery pack (1) comprises a battery body, an inlet and an outlet, wherein an inlet pipeline (2) is arranged at the inlet, and an outlet pipeline (3) is arranged at the outlet; Temperature sensors are respectively arranged on the inlet pipeline (2) and the outlet pipeline (3); The cooling liquid circulation system comprises an electromagnetic valve (4), a pump (5) and a storage tank (6), wherein the electromagnetic valve (4), the pump (5) and the storage tank (6) are respectively connected with an inlet pipeline (2) and an outlet pipeline (3) through pipelines, and cooling liquid is stored in the storage tank (6); The gas circulation system comprises an electromagnetic valve (7), an air pump (8) and a storage tank (9), wherein the electromagnetic valve (7), the air pump (8) and the storage tank (9) are respectively connected with an inlet pipeline (2) and an outlet pipeline (3) through pipelines, and inert gas is stored in the storage tank (9); the control module is respectively connected with each electromagnetic valve, the temperature sensor, the pump (5) and the air pump (8).
2. 2. A high safety battery energy storage device according to claim 1, wherein the battery pack (1) comprises a plurality of batteries.
3. 3. The high-safety battery energy storage device according to claim 1, wherein the battery energy storage device comprises a plurality of groups of battery packs (1), and each group of battery packs (1) is correspondingly provided with an inlet pipeline (2) and an outlet pipeline (3).
4. 4. A high safety battery energy storage device according to claim 1, characterized in that the inlet conduit (2) or the outlet conduit (3) is provided with a solenoid valve.
5. 5. A high safety battery energy storage device according to claim 1, characterized in that the tank (6) is provided with a level gauge and the reservoir (9) is provided with a pressure gauge.
6. 6. A high safety battery energy storage device according to claim 1, characterized in that a liquid flowmeter or a gas flowmeter is arranged on the inlet pipe (2) or the outlet pipe (3).
7. 7. A high safety battery energy storage device according to claim 1, wherein an alarm device is provided in the battery energy storage device.
8. 8. The high-safety battery energy storage device according to claim 1, wherein the cooling liquid is water or antifreeze, and the inert gas is one or more of nitrogen, carbon dioxide and rare gas.
9. 9. A method of thermal management of a high safety battery energy storage device according to any one of claims 1-8, wherein the control module normally controls the solenoid valve (4) in the coolant system to open and the solenoid valve (7) in the gas circulation system to close, the coolant flowing through the interior of the battery pack via the conduit to exchange heat with the battery body to remove heat generated by the battery; when the difference value of the temperatures detected by the temperature sensors on the inlet pipeline (2) and the outlet pipeline (3) exceeds a set value, the control module controls the pump (5) to increase the power and speed up the flow of the cooling liquid, so that the heat exchange efficiency is increased, and the temperature difference is recovered to be within the set value; when the power of the pump (5) is increased and the temperature difference is continuously increased to exceed a threshold value, the control module controls the power supply of the battery energy storage device to be cut off, the charging and discharging process is stopped, meanwhile, the control module controls the electromagnetic valve (4) in the cooling liquid system to be closed, the electromagnetic valve (7) in the gas circulation system to be opened, so that the whole circuit is filled with inert gas, and the battery is in an inert gas atmosphere while the heat generated by the battery is taken away by the inert gas, so that the combustion risk is reduced.
10. 10. A method of thermal management according to claim 9, wherein the alarm means issues an alarm signal when the detected temperature difference exceeds a preset value or threshold.

Description

High-safety battery energy storage device and thermal management method thereof Technical Field The invention relates to a high-safety battery energy storage device and a heat management method thereof, in particular to the technical field of heat management of the energy storage device. Background The battery energy storage system stores redundant electric power in batteries, the batteries in batches are placed in a special battery pack, and the batteries are required to be continuously charged in the process of storing the electric power, so that the temperature of the batteries is gradually increased, the batteries work in a higher temperature environment for a long time, the service life of the batteries is firstly reduced, and spontaneous combustion occurs simultaneously to cause larger loss. At present, the solution for battery energy storage heat management mainly comprises a water cooling mode and an air cooling mode, and heat generated in the battery energy storage process is taken away through medium heat exchange. CN120637688a discloses a thermal management system of an energy storage battery, which comprises a cooling liquid circulation system, a heat storage oil circulation system and a refrigerant circulation system, wherein when a battery pack needs to be cooled by heat dissipation, the heat of the cooling liquid and the heat exchanged by the refrigerant are stored in the heat storage oil, and when the battery pack needs to be heated, the heat storage oil storing the heat is utilized to preheat the cooling liquid, so that the efficiency of the energy storage battery system is improved. The thermal management system can realize thermal management in the battery energy storage process, but has the following defects that firstly, control is not fine enough, when an individual battery pack abnormally heats, accurate temperature control cannot be performed on the specific battery pack, secondly, when the individual battery pack is out of control, oil in an oil tank can aggravate combustion risk, a water cooling or air cooling mode used in the prior art cannot be effectively used, combustion risk is high, and thirdly, the structure is complex, cost is high, and an early warning device is not provided. Disclosure of Invention Aiming at the defects, the invention provides the high-safety battery energy storage device and the thermal management method thereof, which have the advantages of simple structure, capability of realizing accurate temperature control on a single battery pack, reduction of combustion risk and timely early warning. The high-safety battery energy storage device is characterized by comprising a battery pack, a cooling liquid circulation system, a gas circulation system and a control module, wherein the battery pack comprises a battery body, an inlet and an outlet, an inlet pipeline is arranged at the inlet, an outlet pipeline is arranged at the outlet, temperature sensors are respectively arranged on the inlet pipeline and the outlet pipeline, the cooling liquid circulation system comprises an electromagnetic valve, a pump and a storage tank, the electromagnetic valve, the pump and the storage tank are respectively connected with the inlet pipeline and the outlet pipeline through pipelines, cooling liquid is stored in the storage tank, the gas circulation system comprises an electromagnetic valve, an air pump and a storage tank, the electromagnetic valve, the air pump and the storage tank are respectively connected with the inlet pipeline and the outlet pipeline through pipelines, inert gas is stored in the storage tank, and the control module is respectively connected with the electromagnetic valve, the temperature sensors, the pump and the air pump. The battery pack comprises a plurality of batteries. The battery energy storage device comprises a plurality of groups of battery packs, and each group of battery packs is correspondingly provided with an inlet pipeline and an outlet pipeline. And an electromagnetic valve is arranged on the inlet pipeline or the outlet pipeline. The storage tank is provided with a liquid level meter, and the storage tank is provided with a pressure gauge. The inlet pipeline or the outlet pipeline is provided with a liquid flowmeter or a gas flowmeter. And an alarm device is arranged in the battery energy storage device. The cooling liquid is water or antifreeze, and the inert gas is one or more of nitrogen, carbon dioxide and rare gas. A heat management method for a high-safety battery energy storage device comprises the steps that under normal conditions, a control module controls an electromagnetic valve in a cooling liquid system to be opened, an electromagnetic valve in a gas circulation system is closed, cooling liquid flows through the inside of a battery pack through a pipeline and exchanges heat with a battery body to take away heat generated by the battery, when the difference value of temperatures detected by temperature sensors on an inlet