Modular redundant liquid cooling system

Abstract

The application discloses a modular redundancy liquid cooling system, comprising a plurality of battery liquid cooling plates, a liquid cooling circulating evaporation loop, a plurality of compression refrigeration circuits and a liquid cooling heat dissipation condensation circuit; the liquid cooling circulating evaporation loop comprises a first circulating pump and a first check valve, the compression refrigeration circuit comprises a first brazed plate exchanger, a variable frequency compressor, a second brazed plate exchanger and a liquid accumulator, and the liquid cooling heat dissipation condensation circuit comprises a natural cooling radiator, a second circulating pump and a second check valve, wherein the plurality of compression refrigeration circuits are connected in parallel through pipelines. Since the compression refrigeration circuit adopts a modular parallel redundancy design, the number of liquid cooling unit modules can be flexibly configured, the demand of any refrigeration power section can be met, and the configuration is flexible; and the liquid cooling unit adopting the modular redundancy design can realize N+X redundancy or N-1 capacity reduction operation, that is, when any liquid cooling unit module fails, other modules can still work independently, and the refrigeration capacity provided is sufficient to cool the energy storage system, and the reliability is high.

Description

Technical Field

[0001] This application relates to the field of liquid cooling unit technology, specifically to a modular redundant liquid cooling system. Background Technology

[0002] Lithium-ion battery energy storage systems, as a highly efficient and reliable energy storage technology, have been widely used in renewable energy, electric transportation, and smart grids in recent years. Compared with traditional lead-acid batteries, lithium-ion batteries have higher energy density, longer lifespan, and faster charge and discharge speeds, making them an ideal choice for solving energy storage problems. Against the backdrop of global energy transition and increasingly stringent environmental requirements, the application of lithium-ion battery energy storage systems can not only improve energy utilization efficiency but also promote the widespread access and storage of clean energy.

[0003] To ensure the safety of lithium battery energy storage systems, it is essential to ensure that the lithium batteries always operate within their design range, with 25°C generally considered the optimal operating temperature. If the temperature is too low, the activity of the lithium battery will decrease, leading to a decline in charge and discharge performance; if the temperature is too high, the lithium battery may experience thermal runaway or accelerate battery lifespan degradation. Currently, lithium battery cooling primarily employs two technologies: air cooling (air-cooled units) and liquid cooling (liquid-cooled units). Liquid cooling technology includes plate-type liquid cooling and immersion liquid cooling.

[0004] Air cooling technology uses air as a medium to dissipate heat through forced convection, resulting in a simple and low-cost system. However, it suffers from drawbacks such as low heat exchange efficiency (air's specific heat capacity is only 1 / 4000 that of water), poor temperature uniformity (temperature differences often exceed 10°C), and difficulty in adapting to high-power / high-density scenarios.

[0005] Liquid cooling technology utilizes the high heat capacity of liquids (such as water, ethylene glycol solutions, and fluorinated liquids) to achieve efficient heat dissipation, making it the mainstream solution, especially suitable for energy storage systems of hundreds of megawatts or above, or scenarios with drastic temperature fluctuations. Cold plate liquid cooling involves the coolant flowing through cold plates on the bottom or sides of the battery module for indirect contact heat dissipation. It has low modification costs and strong compatibility, but its heat dissipation efficiency is limited by the cold plate layout, and improper flow channel design can lead to excessively large local temperature differences. Immersion liquid cooling directly immerses the battery in an insulating coolant, resulting in a short heat dissipation path and high temperature uniformity (temperature difference ≤1℃), but it faces challenges such as the toxicity of the working fluid (e.g., fluorinated liquids), stringent sealing requirements, and high initial investment.

[0006] In existing technologies, large-scale energy storage liquid cooling units mainly fall into two categories: centralized cooling and distributed cooling. Centralized liquid cooling units are generally installed at the end of a container, and then the coolant is delivered to each liquid-cooled lithium battery pack through the main liquid cooling pipeline and branch pipelines, thereby achieving cooling of the lithium battery system. Distributed cooling units are generally installed at the end or top of the outdoor energy storage cabinet or energy storage container, with one liquid cooling unit per cluster of lithium batteries, thereby improving the reliability of the lithium battery cooling system, but the cost is slightly higher.

[0007] In summary, existing liquid cooling units have the following drawbacks:

[0008] (1) Poor flexibility: The cooling power of liquid cooling units for energy storage is generally customized according to the heat generation of the corresponding lithium battery system that needs to be cooled. The models are relatively simple. If the battery model, system design scheme, etc. change, the liquid cooling unit needs to be redesigned.

[0009] (2) Low reliability: If any component of the liquid cooling unit fails, the system needs to be shut down for maintenance, which reduces its reliability.

[0010] (3) Poor maintainability: Any maintenance of a battery cell requires system shutdown.

[0011] (4) Poor flow equalization: Without unit flow control, the flow is uneven, resulting in large temperature differences in the battery, which further affects battery life and even safety. Summary of the Invention

[0012] Therefore, this application provides a modular redundant liquid cooling system to solve the problems of poor flexibility and low reliability of existing liquid cooling units.

[0013] To achieve the above objectives, this application provides the following technical solution:

[0014] A modular redundant liquid cooling system includes multiple battery liquid cooling plates, a liquid cooling circulation evaporation circuit, multiple compression refrigeration circuits, and a liquid cooling heat dissipation condensation circuit; wherein, the multiple battery liquid cooling plates are connected in parallel through pipes, and the multiple compression refrigeration circuits are connected in parallel through pipes.

[0015] The liquid-cooled circulating evaporation circuit includes an expansion tank, a first circulating pump, and a first one-way valve. The input end of the first circulating pump is fixedly connected to the output end of the multiple parallel battery liquid-cooling plates through a pipe. The expansion tank is fixedly connected between the input end of the first circulating pump and the output end of the multiple parallel battery liquid-cooling plates through a pipe. The output end of the first circulating pump is fixedly connected to the input end of the first one-way valve. The output end of the first one-way valve is fixedly connected to the input end of the multiple parallel battery liquid-cooling plates through a pipe.

[0016] The compression refrigeration circuit includes a first brazed heat exchanger, a variable frequency compressor, a second brazed heat exchanger, a liquid receiver, and an expansion valve. The cold fluid outlet of the first brazed heat exchanger is fixedly connected to the input end of the variable frequency compressor via a pipe. The output end of the variable frequency compressor is fixedly connected to the hot fluid inlet of the second brazed heat exchanger via a pipe. The hot fluid outlet of the second brazed heat exchanger is fixedly connected to the input end of the liquid receiver via a pipe. The output end of the liquid receiver is fixedly connected to the input end of the expansion valve via a pipe. The output end of the expansion valve is fixedly connected to the cold fluid inlet of the first brazed heat exchanger via a pipe. The hot fluid inlet of the first brazed heat exchanger is fixedly connected to the output end of the first one-way valve via a pipe. The hot fluid outlet of the first brazed heat exchanger is fixedly connected to the input ends of the multiple battery liquid cooling plates connected in parallel via a pipe.

[0017] The liquid cooling condensation circuit includes a natural cooling radiator, a second circulation pump, and a second check valve. The input end of the natural cooling radiator is fixedly connected to the cold fluid outlet of the second brazed plate heat exchanger via a pipe. The output end of the natural cooling radiator is fixedly connected to the input end of the second circulation pump via a pipe. The output end of the second circulation pump is fixedly connected to the input end of the second check valve. The output end of the second check valve is fixedly connected to the cold fluid inlet of the second brazed plate heat exchanger via a pipe.

[0018] Preferably, the liquid-cooled circulating evaporation circuit further includes a heater, which is fixedly disposed between the output end of the first one-way valve and the input end of the plurality of battery liquid-cooling plates connected in parallel.

[0019] Preferably, the liquid-cooled circulating evaporation circuit further includes a water replenishment tank, a water replenishment pump, a third one-way valve, and a safety valve. The output end of the water replenishment tank is fixedly connected between the input end of the first circulating pump and the output ends of the multiple battery liquid cooling plates connected in parallel via a pipe. The water replenishment pump and the third one-way valve are sequentially fixedly installed on the output pipe of the water replenishment tank. The safety valve is fixedly installed between the output end of the first one-way valve and the input end of the multiple battery liquid cooling plates connected in parallel. The input end of the water replenishment tank is fixedly connected to the safety valve via a pipe.

[0020] Preferably, the liquid-cooled circulating evaporation circuit further includes a first temperature sensor and a first pressure sensor, which are fixedly disposed between the input end of the first circulating pump and the output ends of the plurality of battery liquid cooling plates connected in parallel.

[0021] Preferably, the liquid-cooled circulating evaporation circuit further includes a second temperature sensor and a second pressure sensor, which are fixedly disposed between the output end of the first one-way valve and the input ends of the multiple battery liquid cooling plates connected in parallel.

[0022] Preferably, the compression refrigeration circuit further includes a low-pressure switch and a high-pressure switch. The low-pressure switch is fixedly disposed between the cold fluid outlet of the first brazed heat exchanger and the input end of the variable frequency compressor, and the high-pressure switch is fixedly disposed between the output end of the variable frequency compressor and the hot fluid inlet of the second brazed heat exchanger.

[0023] Preferably, the compression refrigeration circuit further includes a drying filter, which is fixedly disposed between the output end of the liquid receiver and the input end of the expansion valve.

[0024] Preferably, the compression refrigeration circuit further includes a maintenance valve, which is fixedly disposed between the hot fluid outlet of the second brazed plate heat exchanger and the input end of the liquid receiver.

[0025] Preferably, the liquid cooling condensation circuit further includes a variable frequency fan, which is used for heat dissipation of the natural cooling radiator.

[0026] Preferably, the liquid cooling condensation circuit further includes an electric three-way valve, one end of which is fixedly connected to the output end of the second one-way valve via a pipe, the second end of which is fixedly connected to the cold fluid inlet of the second brazed plate via a pipe, and the third end of which is fixedly connected to the output ends of the multiple battery liquid cooling plates connected in parallel via a pipe.

[0027] Compared with the prior art, this application has at least the following beneficial effects:

[0028] 1. This application provides a modular redundant liquid cooling system, including multiple battery liquid cooling plates, a liquid cooling circulation evaporation circuit, multiple compression refrigeration circuits, and a liquid cooling heat dissipation condensation circuit. The multiple battery liquid cooling plates are connected in parallel via pipes, and the multiple compression refrigeration circuits are also connected in parallel via pipes. Because the compression refrigeration circuits adopt a modular parallel redundant design, the number of liquid cooling unit modules can be flexibly configured to meet the needs of any cooling capacity range, offering flexible configuration. Furthermore, the modular redundant design of the liquid cooling unit allows for N+X redundancy or N-1 derating operation; that is, when any liquid cooling unit module fails, the other modules can still operate independently, providing sufficient cooling capacity for the energy storage system, resulting in high reliability.

[0029] 2. Each compression refrigeration circuit is equipped with an independent maintenance valve. If any branch's battery pack has a problem and needs to be shut down for maintenance, simply close the maintenance valve of that branch, which is convenient for maintenance. Attached Figure Description

[0030] To more intuitively illustrate the prior art and this application, exemplary drawings are provided below. It should be understood that the specific shapes and structures shown in the drawings should not generally be regarded as limiting conditions for implementing this application; for example, based on the technical concept disclosed in this application and the exemplary drawings, those skilled in the art are able to easily make conventional adjustments or further optimizations to the addition / reduction / classification, specific shapes, positional relationships, connection methods, size ratios, etc. of certain units (components).

[0031] Figure 1 This is a schematic diagram of a modular redundant liquid cooling system provided in this application.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Battery liquid cooling plate; 101. Ball valve; 2. Liquid cooling circulating evaporation circuit; 201. Expansion tank; 202. First circulation pump; 203. First check valve; 204. Heater; 205. Water tank; 206. Water pump; 207. Third check valve; 208. Safety valve; 209. Liquid level switch; 210. First pressure sensor; 211. First temperature sensor; 212. Second pressure sensor; 213. Second temperature sensor; 214. Automatic exhaust valve; 3. Compression refrigeration circuit; 301. First brazed plate heat exchanger 302. Variable frequency compressor; 303. Second brazed plate heat exchanger; 304. Liquid receiver; 305. Expansion valve; 306. Low-pressure switch; 307. High-pressure switch; 308. Dryer filter; 309. Third pressure sensor; 310. Third temperature sensor; 311. Fourth temperature sensor; 312. Fourth pressure sensor; 313. Maintenance valve; 4. Liquid cooling condensation circuit; 401. Natural cooling radiator; 402. Variable frequency fan; 403. Second circulation pump; 404. Second check valve; 405. Electric three-way valve. Detailed Implementation

[0034] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] In the description of this application: unless otherwise stated, "a plurality of" means two or more. The terms "first," "second," "third," etc., in this application are intended to distinguish the objects referred to and do not have any special meaning in terms of technical connotation (e.g., they should not be construed as an emphasis on importance or order). Expressions such as "comprising," "including," and "having" also mean "not limited to" (certain units, components, materials, steps, etc.).

[0036] The terms used in this application, such as "upper," "lower," "left," "right," and "middle," are generally used to indicate the general relative positional relationship for the purpose of intuitive understanding by referring to the accompanying drawings, and are not absolute limitations on the positional relationship in the actual product.

[0037] Please see Figure 1 This application provides a modular redundant liquid cooling system, including multiple battery liquid cooling plates 1, liquid cooling circulation evaporation circuits 2, multiple compression refrigeration circuits 3, and liquid cooling heat dissipation condensation circuits 4; wherein, the multiple battery liquid cooling plates 1 are connected in parallel through pipes, and ball valves 101 are fixedly installed at the connection points. By controlling the opening degree of ball valves 101, the flow rate of each liquid cooling branch pipe can be controlled, thereby controlling the battery temperature of each branch with higher precision and reducing the battery temperature difference between different branches; the multiple compression refrigeration circuits 3 are connected in parallel through pipes.

[0038] Specifically, the liquid-cooled circulating evaporation loop 2 includes an expansion tank 201, a first circulating pump 202, and a first one-way valve 203. The expansion tank 201 is mainly used to mitigate pressure fluctuations caused by temperature changes within the system, ensuring stable system operation. The input end of the first circulating pump 202 is fixedly connected to the output end of multiple parallel battery liquid cooling plates 1 via a pipe. The expansion tank 201 is fixedly connected between the input end of the first circulating pump 202 and the output end of the multiple parallel battery liquid cooling plates 1 via a pipe. The output end of the first circulating pump 202 is fixedly connected to the input end of the first one-way valve 203. The output end of the first one-way valve 203 is fixedly connected to the input end of the multiple parallel battery liquid cooling plates 1 via a pipe, thus forming the first independent circulation loop, namely the PACK coolant circulation.

[0039] In this application, the liquid-cooled circulating evaporation circuit 2 is mainly used to send the heat of the battery back to the liquid-cooling unit through the battery liquid-cooling plate 1, and then send low-temperature water to the battery liquid-cooling plate 1 through heat exchange with the liquid-cooling unit to achieve temperature control of the lithium battery energy storage system.

[0040] Specifically, the compression refrigeration circuit 3 includes a first brazed plate heat exchanger 301, a variable frequency compressor 302, a second brazed plate heat exchanger 303, a liquid receiver 304, and an expansion valve 305. The first brazed plate heat exchanger 301 and the second brazed plate heat exchanger 303 are brazed heat exchangers, which are widely used in the field of heat exchange. They mainly use brazing technology to firmly connect different metal materials together to form a compact heat exchange plate structure.

[0041] In this application, the cold fluid outlet of the first brazed plate heat exchanger 301 is fixedly connected to the input end of the variable frequency compressor 302 via a pipe, the output end of the variable frequency compressor 302 is fixedly connected to the hot fluid inlet of the second brazed plate heat exchanger 303 via a pipe, the hot fluid outlet of the second brazed plate heat exchanger 303 is fixedly connected to the input end of the liquid receiver 304 via a pipe, the output end of the liquid receiver 304 is fixedly connected to the input end of the expansion valve 305 via a pipe, and the output end of the expansion valve 305 is fixedly connected to the cold fluid inlet of the first brazed plate heat exchanger 301 via a pipe; the hot fluid inlet of the first brazed plate heat exchanger 301 is fixedly connected to the output end of the first one-way valve 203 via a pipe, and the hot fluid outlet of the first brazed plate heat exchanger 301 is fixedly connected to the input ends of the multiple parallel battery liquid cooling plates 1 via a pipe, thereby forming a second independent circulation loop, namely the refrigerant circulation.

[0042] In this application, the compression refrigeration circuit 3 is composed of multiple modules connected in parallel. The redundancy of the modules in parallel can improve the reliability of the system. Each compression refrigeration circuit 3 has only liquid cooling quick-connect connectors on the condenser side and evaporator side, and a power supply interface with the outside. Any compression refrigeration module (compression refrigeration circuit 3) can work independently or receive control signals from a host computer.

[0043] In this application, because the compression refrigeration circuit 3 adopts a modular parallel redundancy scheme, the number of liquid chiller unit modules can be flexibly configured to meet the needs of any cooling capacity range, offering flexible configuration. Furthermore, the modular redundancy design of the liquid chiller unit achieves N+X redundancy, meaning that when any liquid chiller unit module fails, the other modules can still operate independently, providing sufficient cooling capacity to cool the energy storage system, resulting in high reliability. Additionally, each branch of the liquid chiller unit is equipped with an independent solenoid valve; if any branch's battery pack malfunctions and requires shutdown for maintenance, only the solenoid valve of that branch needs to be closed, ensuring good maintainability.

[0044] Specifically, the liquid cooling condensation circuit 4 includes a natural cooling radiator 401, a second circulation pump 403, and a second one-way valve 404. The input end of the natural cooling radiator 401 is fixedly connected to the cold fluid outlet of the second brazed plate heat exchanger 303 through a pipe. The output end of the natural cooling radiator 401 is fixedly connected to the input end of the second circulation pump 403 through a pipe. The output end of the second circulation pump 403 is fixedly connected to the input end of the second one-way valve 404. The output end of the second one-way valve 404 is fixedly connected to the cold fluid inlet of the second brazed plate heat exchanger 303 through a pipe, thereby forming a third independent circulation circuit, namely the dry cooler liquid circuit circulation.

[0045] In this application, the liquid cooling heat dissipation condensation circuit 4 is mainly used to send the heat of the compression refrigeration circuit 3 to the external natural cooling radiator 401 through the plate heat exchanger (i.e., the second brazed plate heat exchanger 303), and send the low temperature water cooled by the natural cooling radiator 401 back to the compression refrigeration circuit 3.

[0046] Specifically, in the modular redundant liquid cooling system provided in this application, the liquid cooling circulating evaporation circuit 2 further includes a heater 204, which is an electric heater. The heater 204 is fixedly disposed between the output end of the first one-way valve 203 and the input ends of the multiple battery liquid cooling plates 1 connected in parallel. When the ambient temperature is too low, this application can ensure that the lithium battery system operates within the normal range through the heater 204.

[0047] Specifically, in the modular redundant liquid cooling system provided in this application, the liquid cooling circulation evaporation loop 2 further includes a water replenishment tank 205, a water replenishment pump 206, a third one-way valve 207, and a safety valve 208. The output end of the water replenishment tank 205 is fixedly connected via a pipe between the input end of the first circulation pump 202 and the output ends of the multiple parallel battery liquid cooling plates 1. The water replenishment pump 206 and the third one-way valve 207 are sequentially fixedly installed on the output pipe of the water replenishment tank 205. The safety valve 208 is fixedly installed between the output end of the first one-way valve 203 and the input end of the multiple parallel battery liquid cooling plates 1. The input end of the water replenishment tank 205 is fixedly connected to the safety valve 208 via a pipe. In this application, the water replenishment tank 205 can be used to replenish water lost due to leakage or evaporation, ensuring the stability of the water volume in the system.

[0048] More specifically, in the modular redundant liquid cooling system provided in this application, a liquid level switch 209 is also provided in the water replenishment tank 205. The liquid level switch 209 is used to monitor and control the liquid level in the water replenishment tank 205. It can automatically detect changes in the liquid level and start or stop the water replenishment tank 205 according to the preset liquid level requirements.

[0049] Specifically, in a modular redundant liquid cooling system provided in this application, the liquid cooling circulating evaporation loop 2 further includes a first temperature sensor 211 and a first pressure sensor 210. The first temperature sensor 211 and the first pressure sensor 210 are fixedly disposed between the input end of the first circulating pump 202 and the output ends of the multiple battery liquid cooling plates 1 connected in parallel. The first temperature sensor 211 is used to measure the water temperature in the output pipe, and the first pressure sensor 210 is used to measure the water pressure in the output pipe.

[0050] Specifically, in a modular redundant liquid cooling system provided in this application, the liquid cooling circulation evaporation loop 2 further includes a second temperature sensor 213 and a second pressure sensor 212. The second temperature sensor 213 and the second pressure sensor 212 are fixedly disposed between the output end of the first one-way valve 203 and the input end of the multiple battery liquid cooling plates 1 connected in parallel. The second temperature sensor 213 is used to measure the temperature in the input pipe, and the second pressure sensor 212 is used to measure the pressure in the output pipe.

[0051] Specifically, in a modular redundant liquid cooling system provided in this application, the liquid cooling circulation evaporation loop 2 further includes an automatic exhaust valve 214. The automatic exhaust valve 214 is located at the output end of the first one-way valve 203 and is used to automatically remove air or gas from the pipeline to prevent gas accumulation from reducing system efficiency or damaging equipment.

[0052] Specifically, in a modular redundant liquid cooling system provided in this application, the compression refrigeration circuit 3 further includes a low-pressure switch 306 and a high-pressure switch 307. The low-pressure switch 306 is fixedly disposed between the cold fluid outlet of the first brazed plate heat exchanger 301 and the input end of the variable frequency compressor 302, and the high-pressure switch 307 is fixedly disposed between the output end of the variable frequency compressor 302 and the hot fluid inlet of the second brazed plate heat exchanger 303.

[0053] Specifically, in a modular redundant liquid cooling system provided in this application, the compression refrigeration circuit 3 also includes a dryer filter 308. The dryer filter 308 is fixedly installed between the output end of the liquid receiver 304 and the input end of the expansion valve 305. The dryer filter 308 is used to remove moisture, impurities and oil stains in the refrigerant circuit circulation, ensuring that the refrigerant circuit is clean and dry, thereby protecting the normal operation of the equipment and piping system.

[0054] Specifically, in the modular redundant liquid cooling system provided in this application, the compression refrigeration circuit 3 further includes a third temperature sensor 310, a third pressure sensor 309, a fourth temperature sensor 311, and a fourth pressure sensor 312. The third temperature sensor 310 and the third pressure sensor 309 are fixedly disposed between the cold fluid outlet of the first brazed plate heat exchanger 301 and the input end of the variable frequency compressor 302; the fourth temperature sensor 311 and the fourth pressure sensor 312 are fixedly disposed between the output end of the variable frequency compressor 302 and the hot fluid inlet of the second brazed plate heat exchanger 303.

[0055] Specifically, in a modular redundant liquid cooling system provided in this application, the compression refrigeration circuit 3 also includes a maintenance valve 313. The maintenance valve 313 is fixedly installed between the hot fluid outlet of the second brazed plate heat exchanger 303 and the input end of the liquid receiver 304. The maintenance valve 313 is used to quickly cut off or adjust the flow of fluid when the equipment or piping system fails, so as to carry out repair or maintenance work.

[0056] Specifically, in the modular redundant liquid cooling system provided in this application, the liquid cooling heat dissipation condensation circuit 4 also includes a variable frequency fan 402, which is used to improve the heat dissipation efficiency of the natural cooling radiator 401.

[0057] Specifically, in the modular redundant liquid cooling system provided in this application, the liquid cooling condensation circuit 4 further includes an electrically operated three-way valve 405. One end of the electrically operated three-way valve 405 is fixedly connected to the output end of the second one-way valve 404 via a pipe. The second end of the electrically operated three-way valve 405 is fixedly connected to the cold fluid inlet of the second brazed plate heat exchanger 303 via a pipe. The third end of the electrically operated three-way valve 405 is fixedly connected to the output ends of multiple parallel battery liquid cooling plates 1 via a pipe. The liquid cooling condensation circuit 4 can be directly connected to the liquid cooling circulating evaporation circuit 2 by adjusting the electrically operated three-way valve 405, achieving natural cooling when the ambient temperature is low.

[0058] The modular redundant liquid cooling system provided in this application has the following advantages:

[0059] (1) Modular design allows for flexible expansion: The modular design enables flexible expansion of the system and can be flexibly adapted to any application with power requirements;

[0060] (2) High reliability design: The system can be configured with N+1 redundancy according to the application, or it can be operated with N-1 capacity reduction to improve system reliability;

[0061] (3) Standard configuration of natural cooling system with high system efficiency: natural cooling can share the heat dissipation circuit of dry cooler with the condenser circuit of the compression refrigeration circuit, thereby improving the operating efficiency of the system;

[0062] (4) Short fault repair time: Spare modules can be stored at the application site, and any module can be replaced online if there is a problem;

[0063] (5) Loop decoupling design for easy field use: It can decouple the evaporator side, condenser side and compressor refrigeration circuit, improving the system flexibility; when there is industrial cooling water at the application site, the condenser side circuit and compressor refrigeration circuit do not need to be configured, thereby reducing costs;

[0064] (6) Small size and flexible layout: The main components of the compression refrigeration circuit are only the compressor and two plate heat exchangers. The small size makes it easy to standardize and mass produce. In the energy storage system, the dry cooler can be integrated into the top of the container and placed horizontally. The system hot air blows upward and does not occupy the space of the battery system. The system has a small footprint and flexible layout.

[0065] The technical features of the above embodiments can be combined in any way (as long as there is no contradiction in the combination of these technical features). For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described; these embodiments not explicitly written should also be considered to be within the scope of this specification.

Claims

1. A modular redundant liquid cooling system, characterized in that, It includes multiple battery liquid cooling plates, a liquid cooling circulating evaporation circuit, multiple compression refrigeration circuits, and a liquid cooling heat dissipation condensation circuit; wherein, the multiple battery liquid cooling plates are connected in parallel through pipes, and the multiple compression refrigeration circuits are connected in parallel through pipes; The liquid-cooled circulating evaporation circuit includes an expansion tank, a first circulating pump, and a first one-way valve. The input end of the first circulating pump is fixedly connected to the output end of the multiple parallel battery liquid-cooling plates through a pipe. The expansion tank is fixedly connected between the input end of the first circulating pump and the output end of the multiple parallel battery liquid-cooling plates through a pipe. The output end of the first circulating pump is fixedly connected to the input end of the first one-way valve. The output end of the first one-way valve is fixedly connected to the input end of the multiple parallel battery liquid-cooling plates through a pipe. The compression refrigeration circuit includes a first brazed heat exchanger, a variable frequency compressor, a second brazed heat exchanger, a liquid receiver, and an expansion valve. The cold fluid outlet of the first brazed heat exchanger is fixedly connected to the input end of the variable frequency compressor via a pipe. The output end of the variable frequency compressor is fixedly connected to the hot fluid inlet of the second brazed heat exchanger via a pipe. The hot fluid outlet of the second brazed heat exchanger is fixedly connected to the input end of the liquid receiver via a pipe. The output end of the liquid receiver is fixedly connected to the input end of the expansion valve via a pipe. The output end of the expansion valve is fixedly connected to the cold fluid inlet of the first brazed heat exchanger via a pipe. The hot fluid inlet of the first brazed heat exchanger is fixedly connected to the output end of the first one-way valve via a pipe. The hot fluid outlet of the first brazed heat exchanger is fixedly connected to the input ends of the multiple battery liquid cooling plates connected in parallel via a pipe. The liquid cooling condensation circuit includes a natural cooling radiator, a second circulation pump, and a second check valve. The input end of the natural cooling radiator is fixedly connected to the cold fluid outlet of the second brazed plate heat exchanger via a pipe. The output end of the natural cooling radiator is fixedly connected to the input end of the second circulation pump via a pipe. The output end of the second circulation pump is fixedly connected to the input end of the second check valve. The output end of the second check valve is fixedly connected to the cold fluid inlet of the second brazed plate heat exchanger via a pipe. The compression refrigeration circuit also includes a maintenance valve, which is fixedly installed between the hot fluid outlet of the second brazed plate heat exchanger and the input end of the liquid receiver.

2. The modular redundant liquid cooling system according to claim 1, characterized in that, The liquid-cooled circulating evaporation circuit also includes a heater, which is fixedly disposed between the output end of the first one-way valve and the input end of the multiple battery liquid-cooled plates connected in parallel.

3. The modular redundant liquid cooling system according to claim 1, characterized in that, The liquid-cooled circulating evaporation circuit also includes a water replenishment tank, a water replenishment pump, a third one-way valve, and a safety valve. The output end of the water replenishment tank is fixedly connected between the input end of the first circulating pump and the output ends of the multiple battery liquid cooling plates connected in parallel via a pipe. The water replenishment pump and the third one-way valve are sequentially fixedly installed on the output pipe of the water replenishment tank. The safety valve is fixedly installed between the output end of the first one-way valve and the input end of the multiple battery liquid cooling plates connected in parallel. The input end of the water replenishment tank is fixedly connected to the safety valve via a pipe.

4. The modular redundant liquid cooling system according to claim 1, characterized in that, The liquid-cooled circulating evaporation circuit also includes a first temperature sensor and a first pressure sensor, which are fixedly disposed between the input end of the first circulating pump and the output ends of the multiple battery liquid cooling plates connected in parallel.

5. The modular redundant liquid cooling system according to claim 1, characterized in that, The liquid-cooled circulating evaporation circuit also includes a second temperature sensor and a second pressure sensor, which are fixedly disposed between the output end of the first one-way valve and the input ends of the multiple battery liquid-cooled plates connected in parallel.

6. The modular redundant liquid cooling system according to claim 1, characterized in that, The compression refrigeration circuit also includes a low-pressure switch and a high-pressure switch. The low-pressure switch is fixedly installed between the cold fluid outlet of the first brazed heat exchanger and the input end of the variable frequency compressor. The high-pressure switch is fixedly installed between the output end of the variable frequency compressor and the hot fluid inlet of the second brazed heat exchanger.

7. The modular redundant liquid cooling system according to claim 1, characterized in that, The compression refrigeration circuit also includes a drying filter, which is fixedly disposed between the output end of the liquid receiver and the input end of the expansion valve.

8. The modular redundant liquid cooling system according to claim 1, characterized in that, The liquid cooling condensation circuit also includes a variable frequency fan, which is used for heat dissipation of the natural cooling radiator.

9. The modular redundant liquid cooling system according to claim 1, characterized in that, The liquid cooling and condensation circuit also includes an electric three-way valve. One end of the electric three-way valve is fixedly connected to the output end of the second one-way valve through a pipe. The second end of the electric three-way valve is fixedly connected to the cold fluid inlet of the second brazed plate through a pipe. The third end of the electric three-way valve is fixedly connected to the output ends of the multiple battery liquid cooling plates connected in parallel through a pipe.

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