Novel battery energy storage management system coupled with liquid air energy storage
By combining liquid air sprinkler fire extinguishing and low-temperature gaseous air cooling of liquid air system, the temperature management and fire protection management problems of battery energy storage system are solved, the safety and reliability of the system are improved, and management costs are reduced.
Patent Information
- Application Number
- CN202510355434.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-25
- Publication Date
- 2025-08-08
AI Technical Summary
The existing battery energy storage system has shortcomings in temperature management and fire protection management, which affects its safety and reliability and restricts its further development.
Combining the liquid air of the liquid air energy storage system is used for spraying and extinguishing fires in the battery energy storage system, and using the low-temperature gaseous air of the heat exchanger of the final expander for cooling and cooling, a new battery energy storage management system is built that coupled with liquid air energy storage.
It improves the safety and reliability of the battery energy storage system, reduces the overall management cost, and achieves effective temperature control and fire prevention.
Smart Images
Figure CN120453558A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of energy storage technology, and in particular to a novel battery energy storage management system coupled with liquid air energy storage. Background Art
[0002] Energy storage can promote the integration of new energy sources, enhance power system flexibility, and support the safe and stable operation of new power systems. It has become a key technology for building these systems. However, with the rapid growth of energy storage capacity, safety risks are also increasing. Safety has become a bottleneck restricting the further development of battery energy storage systems, especially the lithium-ion battery energy storage industry. How to better manage the temperature and fire protection of battery energy storage systems has become a pressing issue.
[0003] Liquid air energy storage technology offers advantages such as large capacity, high energy density, long life, low cost, and unrestricted geographical location. Furthermore, the system generates large quantities of liquid air during operation, enabling multi-energy complementarity and coordinated coordination of multiple needs. It is suitable for diverse application scenarios, including renewable energy consumption, distributed power microgrids, and integrated energy services. Summary of the Invention
[0004] The purpose of the present invention is to solve the problems of temperature management and fire management of battery energy storage systems existing in the prior art, and to propose a new battery energy storage management system coupled with liquid air energy storage.
[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A new battery energy storage management system coupled with liquid air energy storage includes a compressor unit, an expander unit, a heat exchange circuit, a cold exchanger, a cold accumulator, a liquid air storage tank, a heat exchanger, and a battery energy storage system heat exchange circuit. The compressor unit, liquid air storage tank, and expansion unit are connected in sequence through pipelines. The compressor unit is driven by the motor unit to inhale air to perform work, the liquid air storage tank is used to store liquid air, and the expansion unit is connected to an external generator unit to perform work and output electrical energy. The cooler is installed on the pipeline close to the liquid air storage tank. The cooler is connected to the cold storage device to cool the gas in the pipeline into liquid. The heat exchange circuit circulates on the pipes after the compressor unit and the expander unit respectively, collecting heat from the pipes at the compressor unit and releasing heat from the pipes at the expander unit. The heat exchanger is installed on the battery energy storage system's heat exchange loop, which is connected to the battery modules to cool them. The heat exchanger is also installed on the pipeline after the expansion unit. The heat of the battery modules is transferred to the heat exchanger through the battery energy storage system's heat exchange loop, and then exchanges heat with the cold energy in the pipeline after the expansion unit.
[0006] As a further preferred solution, the heat exchange circuit includes a cold water tank, a hot water tank, a regenerator, and a reheater. The regenerator is installed on the pipeline after the compressor unit, and the reheater is installed on the pipeline after the expansion unit. The cold water tank, regenerator, and hot water tank are connected by pipelines in sequence, and the hot water tank, reheater, and cold water tank are connected by pipelines in sequence.
[0007] As a further preferred embodiment, the heat exchange circuit includes a cold water tank, a hot water tank, two regenerators, and two reheaters; the compressor unit includes a first compressor and a second compressor connected in series to the pipeline; and the expander unit includes a first expander and a second expander connected in series to the pipeline; Among them, one regenerator is located on the pipeline between the first compressor and the second compressor, and the other regenerator is located on the pipeline after the second compressor. The two regenerators are connected to the cold water tank through the water inlet pipe and the hot water tank through the water outlet pipe respectively; Among them, one reheater is located on the pipeline between the first expander and the second expander, and the other reheater is located on the pipeline before the first expander. The two reheaters are connected to the hot water tank through the water inlet pipe and the cold water tank through the water outlet pipe respectively.
[0008] As a further preferred solution, the pipeline connecting the liquid air storage tank to the compressor unit and the pipeline of the expansion unit are commonly connected to the cooler.
[0009] As a further preferred solution, the liquid air storage tank is further provided with a liquid air spray device, and the liquid air spray device is located above the battery module. Beneficial effects
[0010] The present invention combines liquid air energy storage and battery energy storage technologies. It utilizes the two products of the liquid air energy storage system—liquid air and low-temperature air—to manage the safety of the battery energy storage system. It uses liquid air to spray and extinguish potential fires in the battery energy storage system. It uses the low-temperature gaseous air from the final-stage expander heat exchanger to cool and control the temperature of the battery energy storage system. This can effectively improve the safety and reliability of the battery energy storage system and significantly reduce the overall management cost of the energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 This is a schematic structural diagram of a novel battery energy storage management system coupled with liquid air energy storage according to the present invention; Explanation of the accompanying figures: 1-motor unit; 2-compressor unit; 3-expansion unit; 4-generator unit; 5-regenerator; 6-reheater; 7-cold water tank; 8-hot water tank; 9-cold exchanger; 10-cold storage device; 11-liquid air storage tank; 12-liquid air spray device; 13-heat exchanger; 14-battery module; 15-battery system heat exchange circuit. DETAILED DESCRIPTION
[0012] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.
[0013] like Figure 1 , a new battery energy storage management system coupled with liquid air energy storage in this embodiment includes a liquid air system gas circuit circulation, a liquid air system water circuit circulation, a battery energy storage system heat exchange circuit, and a battery energy storage system spray module; The gas circuit of the liquid air system includes a compressor unit 2, an expansion unit 3, a heat exchange circuit, a cold exchanger 9, a cold storage device 10, a liquid air storage tank 11, and a heat exchanger 13; The compressor unit 2, the liquid air storage tank 11, and the expansion unit 3 are connected in sequence through gas pipelines. The compressor unit 2 is driven by the motor unit 1 to inhale air to perform work, the liquid air storage tank 11 is used to store liquid air, and the expansion unit 3 is externally connected to the generator unit 4 to perform work and output electrical energy. The heat exchange circuit circulates on the pipes after the compressor unit 2 and the expander unit 3, respectively, to collect heat from the pipe at the compressor unit 2 and to release heat from the pipe at the expander unit 3; The liquid air storage tank 11 is connected to the gas pipeline of the compressor unit 2 and the gas pipeline of the expansion unit 3, which are jointly connected to the cold exchanger 9; the cold exchanger 9 is installed on the pipeline close to the liquid air storage tank 11, and the cold exchanger 9 is externally connected to the cold storage device 10, which is used to cool the gas in the pipeline into liquid, or heat the liquid air to room temperature.
[0014] The water circulation of the liquid air system is the internal circulation of the heat exchange circuit. The heat exchange medium is water. The heat exchange circuit includes a cold water tank 7, a hot water tank 8, a reheater 5, and a reheater 6. The reheater 5 is installed on the pipeline after the compressor unit 2, and the reheater 6 is installed on the pipeline after the expansion unit 3. The cold water tank 7, the reheater 5, and the hot water tank 8 are connected in sequence by pipelines. The hot water tank 8, the reheater 6, and the cold water tank 7 are connected in sequence by pipelines.
[0015] Further, such as Figure 1 As shown, the heat exchange circuit includes a cold water tank 7, a hot water tank 8, two regenerators 5, and two reheaters 6. The compressor unit 2 includes a first compressor and a second compressor connected in series with the pipeline. The expander unit 3 includes a first expander and a second expander connected in series with the pipeline. One regenerator 5 is located on the pipeline between the first and second compressors, and the other regenerator 5 is located on the pipeline after the second compressor. The two regenerators 5 are connected to the cold water tank 7 via an inlet pipe and to the hot water tank 8 via an outlet pipe. The heat exchange circuit in the cold water tank 7 can complete inter-stage heat exchange with the compressor through the regenerator 5, and the heat is stored in the hot water tank 8.
[0016] Among them, one reheater 6 is located on the pipeline between the first expander and the second expander, and the other reheater 6 is located on the pipeline before the first expander. The two reheaters 6 are connected to the hot water tank 8 through the water inlet pipe and connected to the cold water tank 7 through the water outlet pipe.
[0017] At this time, the heat exchange circuit in the hot water tank 8 can complete inter-stage heat exchange with the expansion unit 3 through the reheater 6, heating the air for expansion and power generation, and the working medium after heat exchange is stored in the cold water tank 7.
[0018] During the liquid air preparation process, the outside air is filtered and then enters the compressor unit for multi-stage compression. At the outlet of each compressor, the air completes heat exchange with the cold water in the water circulation through the regenerator and stores the compression heat. It then enters the inlet of the next compressor. Finally, the compressed high-pressure air is cooled through the cooler and the cold storage device, cooled into liquid, and stored in the liquid air storage tank.
[0019] In the water circulation, the cold water in the cold water tank is pumped into the regenerator to complete the inter-stage heat exchange with the compressed air and then enters the hot water tank, storing the compression heat in the form of internal energy of water.
[0020] During the liquid air utilization process, the liquid air stored in the liquid air storage tank enters the cooler and regenerator through pipelines for cooling, where it is heated to room temperature. It is further heated in the reheater and then enters the expander for multi-stage expansion and inter-stage heat exchange. Finally, it is discharged into the atmosphere through the outlet of the final expander. In the water circuit, hot water from the hot water tank enters the reheater to heat the air before entering the cold water tank through water pipelines.
[0021] In the battery energy storage system heat exchange loop 15, the heat exchange medium flows through the battery module 14 and the heat exchanger 13 in sequence, and exchanges heat with the air at the outlet of the final expander of the liquid air energy storage system expansion unit, thereby achieving cooling and temperature management of the battery module; specifically, the heat exchanger 13 is installed on the battery energy storage system heat exchange loop 15, and the battery energy storage system heat exchange loop 15 is connected to the battery module 14 to cool it. The heat exchanger 13 is also installed on the pipeline after the expansion unit 3. The heat of the battery module 14 is transferred to the heat exchanger 13 by the battery energy storage system heat exchange loop 15, and heat is exchanged with the cold energy in the pipeline after the expansion unit 3.
[0022] In the battery energy storage system spray module, the liquid air in the liquid air storage tank is used to manage the fire of the battery module through the liquid air spray device 12. When the battery catches fire or explodes due to overheating or short circuit, the liquid air can be sprayed directly onto the battery module to quickly extinguish the fire.
[0023] In this embodiment, a new battery energy storage management system coupled with liquid air energy storage is used to implement the working principle of liquid air preparation: During the energy storage process, motor unit 1 supplies power to compressor unit 2, and the air circuit begins operating. Filtered outside air enters compressor unit 2 for multi-stage compression. At the outlet of each compressor stage, it passes through regenerator 5 to exchange heat with cold water in the water circuit, storing the heat of compression. After compression, it enters the inlet of the next compressor stage. Finally, the compressed high-pressure air passes through cold exchanger 9 and cold accumulator 10, cooling it to liquid form and storing it in liquid air storage tank 11. In the water circuit, cold water from cold water tank 7 is pumped into regenerator 5, exchanging heat between stages with the compressed air, and then enters hot water tank 8, storing the heat of compression as the water's internal energy. The energy storage process ends when the liquid level in liquid air storage tank 11 reaches a certain value.
[0024] During the electrical energy release process, the liquid air stored in the liquid air storage tank 11 enters the cooler 9 through a pipeline, where it exchanges heat with the cold accumulator 10 and is heated to room temperature. It is further heated by the reheater 6 before entering the expansion unit 3 for multi-stage expansion and inter-stage heat exchange. Finally, it is discharged into the atmosphere through the outlet of the final expander. During the water cycle, hot water from the hot water tank 8 enters the reheater 6 to heat the air, and then enters the cold water tank 7 through the water pipeline. The energy release process ends when the liquid level in the liquid air storage tank 11 drops to a certain value.
[0025] In this embodiment, a new battery energy storage management system coupled with liquid air energy storage is used to implement the working principle of cooling the battery energy storage system and fire extinguishing: In the heat exchange circuit of the battery energy storage system, the heat exchange medium flows through the battery module 14 and the heat exchanger 13 in sequence, and exchanges heat with the air at the outlet of the final expander of the expander group 3 of the liquid air energy storage system, thereby achieving cooling and temperature management of the battery module 14.
[0026] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.
Claims
1. A novel battery energy storage management system coupled with liquid air energy storage, characterized by: It includes a compressor unit (2), an expansion unit (3), a heat exchange circuit, a cold exchanger (9), a cold storage device (10), a liquid air storage tank (11), a heat exchanger (13), and a battery energy storage system heat exchange circuit (15); The compressor unit (2), the liquid air storage tank (11), and the expansion unit (3) are connected in sequence through pipelines, wherein the compressor unit (2) is driven by the motor unit (1) to inhale air to perform work, the liquid air storage tank (11) is used to store liquid air, and the expansion unit (3) is externally connected to the generator unit (4) to perform work and output electrical energy; The cooler (9) is installed on a pipeline close to the liquid air storage tank (11), and the cooler (9) is externally connected to a cold storage device (10) for cooling the gas in the pipeline into liquid; The heat exchange circuit circulates on the pipelines after the compressor unit (2) and the expansion unit (3) respectively, and is used to collect heat from the pipeline at the compressor unit (2) and to release heat from the pipeline at the expansion unit (3); The heat exchanger (13) is installed on the battery energy storage system heat exchange circuit (15), and the battery energy storage system heat exchange circuit (15) is connected to the battery module (14) to cool it. The heat exchanger (13) is also installed on the pipeline after the expansion unit (3). The heat of the battery module (14) is transferred to the heat exchanger (13) by the battery energy storage system heat exchange circuit (15) and exchanges heat with the cold energy in the pipeline after the expansion unit (3).
2. A novel battery energy storage management system coupled with liquid air energy storage according to claim 1, characterized in that: The heat exchange circuit comprises a cold water tank (7), a hot water tank (8), a reheater (5), and a reheater (6); the reheater (5) is installed on a pipeline after the compressor unit (2); the reheater (6) is installed on a pipeline after the expansion unit (3); the cold water tank (7), the reheater (5), and the hot water tank (8) are connected in sequence through pipelines; and the hot water tank (8), the reheater (6), and the cold water tank (7) are connected in sequence through pipelines.
3. The novel battery energy storage management system coupled with liquid air energy storage according to claim 1, characterized in that: The heat exchange circuit comprises a cold water tank (7), a hot water tank (8), two regenerators (5), and two reheaters (6); the compressor unit (2) comprises a first compressor and a second compressor connected in series to a pipeline; and the expander unit (3) comprises a first expander and a second expander connected in series to a pipeline; Wherein, one regenerator (5) is located on the pipeline between the first compressor and the second compressor, and the other regenerator (5) is located on the pipeline after the second compressor. The two regenerators (5) are respectively connected to the cold water tank (7) through the water inlet pipe and are respectively connected to the hot water tank (8) through the water outlet pipe. One reheater (6) is located on the pipeline between the first expander and the second expander, and the other reheater (6) is located on the pipeline before the first expander. The two reheaters (6) are connected to the hot water tank (8) through the water inlet pipe and connected to the cold water tank (7) through the water outlet pipe.
4. A novel battery energy storage management system coupled with liquid air energy storage according to claim 3, characterized in that: The pipeline connecting the liquid air storage tank (11) to the compressor unit (2) and the pipeline connecting the expansion unit (3) are connected to the cooler (9).
5. The novel battery energy storage management system coupled with liquid air energy storage according to claim 3 is characterized in that: The liquid air storage tank (11) is further provided with a liquid air spray device (12), and the liquid air spray device (12) is located above the battery module (14).