Modularized redundant liquid cooling system

Abstract

The invention discloses a modular redundant liquid cooling system which comprises a plurality of battery liquid cooling plates, a liquid cooling circulation evaporation loop, a plurality of compression refrigeration loops and a liquid cooling heat dissipation condensation loop. Each liquid cooling circulation evaporation loop comprises a first circulation pump and a first one-way valve, each compression refrigeration loop comprises a first brazing plate heat exchanger, an inverter compressor, a second brazing plate heat exchanger and a liquid storage device, each liquid cooling heat dissipation condensation loop comprises a natural cooling radiator, a second circulation pump and a second one-way valve, and the multiple compression refrigeration loops are connected in parallel through pipelines. The compression refrigeration loop adopts a modular parallel redundancy design, so that the number of modules of the liquid cooling unit can be flexibly configured, the requirements of any cooling capacity power section are met, and the configuration is flexible; the liquid cooling unit is designed through modular redundancy, N + X redundancy or N-1 capacity reduction operation can be achieved, that is, when any one liquid cooling unit module breaks down, other modules can still work independently, the provided refrigerating capacity is enough for cooling the energy storage system, and reliability is high.

Description

Technical Field

[0001] This application relates to the technical field of liquid cooling units, and particularly to a modular redundant liquid cooling system. Background Art

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

[0003] To ensure the safety of lithium battery energy storage systems, it is necessary to ensure that lithium batteries always operate within the designed range. Generally, 25°C is the optimal operating temperature. If the temperature is too low, the activity of lithium batteries will decrease, resulting in a decline in charge and discharge performance; if the temperature is too high, lithium batteries may experience thermal runaway or accelerated degradation of their service life. Currently, lithium battery cooling mainly uses two technologies: air cooling technology (air-cooled units) and liquid cooling technology (liquid-cooled units). Among them, liquid cooling technology includes cold plate liquid cooling and immersion liquid cooling.

[0004] Air cooling technology uses air as the medium and dissipates heat through forced convection. The system is simple and low-cost. However, it has defects such as low heat transfer efficiency (the specific heat capacity of air is only 1 / 4000 of that of water), poor temperature uniformity (the temperature difference often exceeds 10°C), and difficulty in adapting to high-power / high-density scenarios.

[0005] Liquid cooling technology achieves efficient heat dissipation through the high heat capacity characteristics of liquids (such as water, ethylene glycol solution, and fluorinated liquid, etc.), and has become the current mainstream solution, especially suitable for energy storage systems above megawatt level or scenarios with drastic fluctuations in ambient temperature. Among them, cold plate liquid cooling dissipates heat indirectly by flowing the coolant through the cold plates at the bottom or side of the battery module. It has low retrofit cost and strong compatibility, but the heat dissipation efficiency is limited by the cold plate layout, and local temperature differences may be too large due to improper flow channel design. Immersion liquid cooling directly immerses the battery in an insulating coolant. The heat dissipation path is short and the temperature uniformity is high (temperature difference ≤ 1°C), but there are challenges such as the toxicity of the working medium (such as fluorinated liquid), strict sealing requirements, and high initial investment.

[0006] In the prior art, large-scale energy storage liquid cooling units mainly include two types: centralized cooling and distributed cooling. The centralized liquid cooling unit is generally installed at the end of the container, and then the coolant is sent to each liquid-cooled lithium battery pack through the main liquid cooling pipeline and branch pipelines, so as to realize the cooling of the lithium battery system; the distributed cooling unit is generally installed at the end or top of the energy storage outdoor cabinet or energy storage container, realizing one liquid cooling unit for one cluster of lithium batteries, thereby improving the reliability of the lithium battery cooling system, but the cost is slightly higher.

[0007] To sum up, the existing liquid cooling units have the following defects:

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

[0009] (2) Low reliability: If any device of the liquid cooling unit fails, the system needs to be shut down for maintenance, resulting in reduced reliability.

[0010] (3) Poor maintainability: Any maintenance of the battery unit requires the system to be shut down.

[0011] (4) Poor flow uniformity: There is no unit flow control, and the flow is uneven, resulting in a large temperature difference between the batteries, further affecting the battery life and even safety. Summary of the Invention

[0012] Therefore, the present application provides a modular redundant liquid cooling system to solve the problems of poor flexibility and low reliability of the liquid cooling unit in the prior art.

[0013] In order to achieve the above object, the present application provides the following technical solutions:

[0014] A modular redundant liquid cooling system includes a plurality of battery liquid cooling plates, a liquid cooling circulation evaporation loop, a plurality of compression refrigeration loops, and a liquid cooling heat dissipation condensation loop; wherein, the plurality of battery liquid cooling plates are connected in parallel through pipelines, and the plurality of compression refrigeration loops are connected in parallel through pipelines;

[0015] The liquid cooling circulation evaporation loop includes an expansion tank, a first circulation pump, and a first check valve. The input end of the first circulation pump is fixedly connected to the output ends of the plurality of battery liquid cooling plates connected in parallel through a pipeline. The expansion tank is fixedly connected through a pipeline between the input end of the first circulation pump and the output ends of the plurality of battery liquid cooling plates connected in parallel. The output end of the first circulation pump is fixedly connected to the input end of the first check valve, and the output end of the first check valve is fixedly connected to the input ends of the plurality of battery liquid cooling plates connected in parallel through a pipeline;

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

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

[0018] Preferably, the liquid cooling circulation evaporation circuit further includes a heater, which is fixedly arranged between the output end of the first check valve and the input ends of multiple parallel-connected battery liquid cooling plates.

[0019] Preferably, the liquid cooling circulation evaporation circuit further includes a makeup water tank, a makeup water pump, a third check valve, and a safety valve. The output end of the makeup water tank is fixedly connected through a pipeline between the input end of the first circulation pump and the output ends of multiple parallel-connected battery liquid cooling plates. The makeup water pump and the third check valve are fixedly arranged in sequence on the output pipeline of the makeup water tank. The safety valve is fixedly arranged between the output end of the first check valve and the input ends of multiple parallel-connected battery liquid cooling plates. The input end of the makeup water tank is fixedly connected to the safety valve through a pipeline.

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

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

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

[0023] Preferably, the compression refrigeration circuit further includes a dryer filter, which is fixedly arranged 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 service valve, which is fixedly arranged between the hot fluid outlet of the second brazed plate heat exchanger and the input end of the liquid receiver.

[0025] Preferably, the liquid-cooled heat dissipation and condensation circuit further includes a variable-frequency fan for dissipating heat from the natural cold radiator.

[0026] Preferably, the liquid-cooled heat dissipation and condensation circuit further 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 pipeline, the second end of the electric three-way valve is fixedly connected to the cold fluid inlet of the second brazed plate heat exchanger through a pipeline, and the third end of the electric three-way valve is fixedly connected to the output ends of multiple battery liquid-cooled plates connected in parallel through a pipeline.

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

[0028] 1. The present application provides a modular redundant liquid-cooling system, including multiple battery liquid-cooled plates, a liquid-cooling circulation evaporation circuit, multiple compression refrigeration circuits, and a liquid-cooled heat dissipation and condensation circuit. Among them, multiple battery liquid-cooled plates are connected in parallel through pipelines, and multiple compression refrigeration circuits are connected in parallel through pipelines. Since the compression refrigeration circuit adopts a modular parallel redundant design, the number of liquid-cooling unit modules can be flexibly configured to meet the requirements of any cooling power segment, with flexible configuration. And by adopting a modular redundant design for the liquid-cooling unit, N+X redundancy or N-1 derating operation can be achieved, that is, when any one liquid-cooling unit module fails, other modules can still work independently, and the provided refrigeration capacity is sufficient to cool the energy storage system, with high reliability.

[0029] 2. Each compression refrigeration circuit is equipped with an independent service valve. When there is a problem with any branch of the battery pack and shutdown for maintenance is required, only the service valve of this branch needs to be closed, which is convenient for maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] To more intuitively illustrate the prior art and the present application, exemplary drawings are given below. It should be understood that the specific shapes and structures shown in the drawings generally should not be regarded as limiting conditions when implementing the present application; for example, those skilled in the art are capable of making routine adjustments or further optimizations to the addition / removal / attribution division of certain units (components), specific shapes, positional relationships, connection methods, dimensional proportional relationships, etc. based on the technical concepts disclosed in the present application and the exemplary drawings.

[0031] Figure 1 This is a schematic structural diagram of a modular redundant liquid cooling system provided by the present application.

[0032] Explanation of reference numerals:

[0033] 1. Battery liquid cooling plate; 101. Ball valve; 2. Liquid cooling circulation evaporation circuit; 201. Expansion tank; 202. First circulation pump; 203. First check valve; 204. Heater; 205. Make-up water tank; 206. Make-up 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. Dry filter; 309. Third pressure sensor; 310. Third temperature sensor; 311. Fourth temperature sensor; 312. Fourth pressure sensor; 313. Service valve; 4. Liquid cooling heat dissipation 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 manners

[0034] The following further details the present application through specific embodiments in conjunction with the drawings.

[0035] In the description of the present application: Unless otherwise specified, "a plurality of" means two or more. The terms "first", "second", "third", etc. in the present application are intended to distinguish the objects being referred to, and do not have special significance in terms of technical connotations (for example, it should not be understood as emphasizing the importance or order, etc.). Expressions such as "including", "comprising", "having", etc. also mean "not limited to" (certain units, components, materials, steps, etc.).

[0036] Terms such as "upper", "lower", "left", "right", "middle", etc. cited in the present application are generally indications of the general relative positional relationship for the convenience of intuitively understanding with reference to the drawings, and are not absolute limitations on the positional relationship in the actual product.

[0037] Please refer to Figure 1 , this application provides a modular redundant liquid cooling system, including multiple battery liquid cooling plates 1, a liquid cooling circulation evaporation loop 2, multiple compression refrigeration loops 3, and a liquid cooling heat dissipation condensation loop 4; among them, the multiple battery liquid cooling plates 1 are connected in parallel through pipelines, and a ball valve 101 is fixedly arranged at the connection, and the flow rate of each liquid cooling branch pipeline can be controlled by controlling the opening of the ball valve 101, so as to control the battery temperature of each branch with higher precision and reduce the battery temperature difference between different branches; the multiple compression refrigeration loops 3 are connected in parallel through pipelines.

[0038] Specifically, the liquid cooling circulation evaporation loop 2 includes an expansion tank 201, a first circulation pump 202, and a first check valve 203. Among them, the expansion tank 201 is mainly used to relieve the pressure fluctuation caused by temperature change in the system and ensure the stable operation of the system. The input end of the first circulation pump 202 is fixedly connected to the output end of the multiple battery liquid cooling plates 1 connected in parallel through a pipeline, the expansion tank 201 is fixedly connected to the pipeline between the input end of the first circulation pump 202 and the output end of the multiple battery liquid cooling plates 1 connected in parallel, the output end of the first circulation pump 202 is fixedly connected to the input end of the first check valve 203, and the output end of the first check valve 203 is fixedly connected to the input end of the multiple battery liquid cooling plates 1 connected in parallel through a pipeline, thus forming a first independent circulation loop, that is, the PACK coolant circulation.

[0039] In this application, the liquid cooling circulation evaporation loop 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 the 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 loop 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. Among them, the first brazed plate heat exchanger 301 and the second brazed plate heat exchanger 303 are brazed heat exchangers, which are devices widely used in the field of heat exchange. They mainly firmly connect different metal materials through brazing process to form a tight 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 through a pipeline. 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 through a pipeline. The hot fluid outlet of the second brazed plate heat exchanger 303 is fixedly connected to the input end of the liquid receiver 304 through a pipeline. The output end of the liquid receiver 304 is fixedly connected to the input end of the expansion valve 305 through a pipeline. The output end of the expansion valve 305 is fixedly connected to the cold fluid inlet of the first brazed plate heat exchanger 301 through a pipeline. The hot fluid inlet of the first brazed plate heat exchanger 301 is fixedly connected to the output end of the first check valve 203 through a pipeline. The hot fluid outlet of the first brazed plate heat exchanger 301 is fixedly connected to the input ends of multiple parallel-connected battery liquid cooling plates 1 through a pipeline, thereby forming a second independent circulation loop, that is, the fluorine circuit circulation.

[0042] In this application, the compression refrigeration circuit 3 is composed of multiple modules connected in parallel. By the parallel redundancy of the modules, the reliability of the system can be improved. Each compression refrigeration circuit 3 has only liquid cooling quick-connect joints on the condensation side and evaporation side and a power supply interface as the interfaces with the outside. Any compression refrigeration module (compression refrigeration circuit 3) can work independently or receive control signals from the upper computer.

[0043] In this application, since the compression refrigeration circuit 3 adopts a modular parallel redundancy scheme, the number of liquid cooling unit modules can be flexibly configured, so as to meet the requirements of any cooling power segment, with flexible configuration. And by using a modular redundant design for the liquid cooling unit, N+X redundancy can be achieved, that is, when any one liquid cooling unit module fails, other modules can still work independently, and the provided refrigeration capacity is sufficient to cool the energy storage system, with high reliability. In addition, each branch of the liquid cooling unit is equipped with an independent solenoid valve. When there is a problem with the battery pack in any branch and shutdown maintenance is required, only the solenoid valve of this branch needs to be closed, with good maintainability.

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

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

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

[0047] Specifically, in a modular redundant liquid cooling system provided by the present application, the liquid cooling circulation evaporation loop 2 further includes a water replenishing tank 205, a water replenishing pump 206, a third one-way valve 207, and a safety valve 208. The output end of the water replenishing tank 205 is fixedly connected by a pipeline between the input end of the first circulation pump 202 and the output ends of multiple parallel-connected battery liquid cooling plates 1. The water replenishing pump 206 and the third one-way valve 207 are fixedly arranged on the output pipeline of the water replenishing tank 205 in sequence. The safety valve 208 is fixedly arranged between the output end of the first one-way valve 203 and the input ends of multiple parallel-connected battery liquid cooling plates 1. The input end of the water replenishing tank 205 is fixedly connected to the safety valve 208 through a pipeline. In the present application, the water replenishing tank 205 can be used to supplement the water lost due to leakage or evaporation, etc., to ensure the stability of the water volume in the system.

[0048] More specifically, in a modular redundant liquid cooling system provided by the present application, a liquid level switch 209 is further arranged in the water replenishing tank 205. The liquid level switch 209 is used to monitor and control the liquid level height of the liquid in the water replenishing tank 205. It can automatically detect the change in the liquid level and start or stop the water replenishment of the water replenishing tank 205 according to the preset liquid level requirement.

[0049] Specifically, in a modular redundant liquid cooling system provided by the present application, the liquid cooling circulation 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 arranged between the input end of the first circulation pump 202 and the output ends of multiple parallel-connected battery liquid cooling plates 1. The first temperature sensor 211 is used to measure the water temperature in the output pipeline, and the first pressure sensor 210 is used to measure the water pressure in the output pipeline.

[0050] Specifically, in a modular redundant liquid cooling system provided by the present 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 arranged between the output end of the first one-way valve 203 and the input ends of multiple parallel-connected battery liquid cooling plates 1. The second temperature sensor 213 is used to measure the temperature in the input pipeline, and the second pressure sensor 212 is used to measure the pressure in the output pipeline.

[0051] Specifically, in a modular redundant liquid cooling system provided by the present application, the liquid cooling circulation evaporation circuit 2 further includes an automatic exhaust valve 214. The automatic exhaust valve 214 is arranged at the output end of the first check valve 203 and is used to automatically exhaust air or gas in the pipeline to prevent gas accumulation from causing a reduction in system efficiency or equipment damage.

[0052] Specifically, in a modular redundant liquid cooling system provided by the present 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 arranged 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 arranged 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 by the present application, the compression refrigeration circuit 3 further includes a dryer filter 308. The dryer filter 308 is fixedly arranged between the output end of the accumulator 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 fluorine circuit circulation to ensure that the fluorine circuit is clean and dry, thereby protecting the normal operation of the equipment and the pipeline system.

[0054] Specifically, in a modular redundant liquid cooling system provided by the present 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 arranged 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 arranged 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 by the present application, the compression refrigeration circuit 3 further includes a service valve 313. The service valve 313 is fixedly arranged between the hot fluid outlet of the second brazed plate heat exchanger 303 and the input end of the accumulator 304. The service valve 313 is used to quickly cut off or adjust the flow of fluid when a failure occurs in the equipment or the pipeline system, so as to carry out repair or maintenance work.

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

[0057] Specifically, in a modular redundant liquid cooling system provided by the present application, the liquid cooling and heat dissipation condensation loop 4 further includes an electric three-way valve 405. One end of the electric three-way valve 405 is fixedly connected to the output end of the second one-way valve 404 through a pipeline. The second end of the electric three-way valve 405 is fixedly connected to the cold fluid inlet of the second brazed plate heat exchanger 303 through a pipeline. The third end of the electric three-way valve 405 is fixedly connected to the output ends of multiple parallel battery liquid cooling plates 1 through a pipeline. The liquid cooling and heat dissipation condensation loop 4 can be directly connected to the liquid cooling circulation evaporation loop 2 by adjusting the electric three-way valve 405 to achieve natural cooling when the ambient temperature is relatively low.

[0058] A modular redundant liquid cooling system provided by the present application has the following advantages:

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

[0060] (2) High-reliability design: An N+1 redundant system can be configured according to the application, or N-1 derating operation can be achieved to improve the system reliability;

[0061] (3) Standard natural cooling system, high system efficiency: Natural cooling can share the dry cooler heat dissipation loop with the condensation loop of the compression refrigeration circuit to improve the operating efficiency of the system;

[0062] (4) Short fault repair time: Spare modules can be stored at the application site. When any module has a problem, it can be replaced by on-line plugging and unplugging;

[0063] (5) Loop decoupling design, convenient on-site use: Decoupling of the evaporation side, condensation side, and compression refrigeration circuit can be achieved to improve the flexibility of the system; When there is industrial cooling water at the application site, the condensation side circuit and the compression refrigeration circuit can be not configured, thereby reducing costs;

[0064] (6) Small volume, flexible layout: The main components of the compression refrigeration circuit are only the compressor and two plate heat exchangers, with a small volume, which is convenient for standardized mass production; In the energy storage system, the dry cooler can be integrated on the top of the container and placed horizontally. The hot air of the system blows upward and does not occupy the space of the battery system. The floor area of the system is small and the layout is flexible.

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

Claims

1. A modular redundant liquid cooling system, characterized in that: It includes a plurality of battery liquid cooling plates, a liquid cooling cycle evaporation circuit, a plurality of compression refrigeration circuits and a liquid cooling heat dissipation condensation circuit; wherein the plurality of battery liquid cooling plates are connected in parallel through pipelines, and the plurality of compression refrigeration circuits are connected in parallel through pipelines; The liquid cooling circulation evaporation loop includes an expansion tank, a first circulation pump and a first one-way valve, the input end of the first circulation pump is fixedly connected to the output ends of the plurality of battery liquid cooling plates connected in parallel through a pipeline, the expansion tank is fixedly connected between the input end of the first circulation pump and the output ends of the plurality of battery liquid cooling plates connected in parallel through a pipeline, the output end of the first circulation pump is fixedly connected to the input end of the first one-way valve, and the output end of the first one-way valve is fixedly connected to the input ends of the plurality of battery liquid cooling plates connected in parallel through a pipeline; The compression refrigeration circuit includes a first brazed plate exchanger, a variable frequency compressor, a second brazed plate exchanger, a liquid reservoir and an expansion valve, wherein the cold fluid outlet of the first brazed plate exchanger is fixedly connected to the input end of the variable frequency compressor through a pipeline, the output end of the variable frequency compressor is fixedly connected to the hot fluid inlet of the second brazed plate exchanger through a pipeline, the hot fluid outlet of the second brazed plate exchanger is fixedly connected to the input end of the liquid reservoir through a pipeline, the output end of the liquid reservoir is fixedly connected to the input end of the expansion valve through a pipeline, and the output end of the expansion valve is fixedly connected to the cold fluid inlet of the first brazed plate exchanger through a pipeline; the hot fluid inlet of the first brazed plate exchanger is fixedly connected to the output end of the first one-way valve through a pipeline, and the hot fluid outlet of the first brazed plate exchanger is fixedly connected to the input end of the plurality of battery liquid cooling plates connected in parallel through a pipeline; The liquid-cooled heat dissipation condensation circuit includes a natural cooling radiator, a second circulation pump and a second one-way valve. The input end of the natural cooling radiator is fixedly connected to the cold fluid outlet of the second brazed plate exchanger through a pipeline, the output end of the natural cooling radiator is fixedly connected to the input end of the second circulation pump through a pipeline, the output end of the second circulation pump is fixedly connected to the input end of the second one-way valve, and the output end of the second one-way valve is fixedly connected to the cold fluid inlet of the second brazed plate exchanger through a pipeline.

2. The modular redundant liquid cooling system according to claim 1, characterized in that: The liquid cooling cycle evaporation loop also includes a heater, and the heater is fixedly arranged between the output end of the first one-way valve and the input ends of the plurality of battery liquid cooling plates connected in parallel.

3. The modular redundant liquid cooling system according to claim 1, characterized in that: The liquid cooling circulation evaporation loop also includes a water supply tank, a water supply pump, a third one-way valve and a safety valve. The output end of the water supply tank is fixedly connected between the input end of the first circulation pump and the output ends of the plurality of battery liquid cooling plates connected in parallel through a pipeline. The water supply pump and the third one-way valve are fixedly arranged on the output pipeline of the water supply tank in sequence. The safety valve is fixedly arranged 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. The input end of the water supply tank is fixedly connected to the safety valve through a pipeline.

4. The modular redundant liquid cooling system according to claim 1, characterized in that: The liquid cooling circulation evaporation loop further includes a first temperature sensor and a first pressure sensor, and the first temperature sensor and the first pressure sensor are fixedly arranged between the input end of the first circulation pump and the output ends of the plurality of battery liquid cooling plates connected in parallel.

5. The modular redundant liquid cooling system according to claim 1, characterized in that: The liquid cooling cycle evaporation loop also includes a second temperature sensor and a second pressure sensor, and the second temperature sensor and the second pressure sensor are fixedly arranged between the output end of the first one-way valve and the input ends of the plurality of battery liquid cooling 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 arranged between the cold fluid outlet of the first brazed plate exchanger and the input end of the variable frequency compressor, and the high-pressure switch is fixedly arranged between the output end of the variable frequency compressor and the hot fluid inlet of the second brazed plate exchanger.

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

8. The modular redundant liquid cooling system according to claim 1, characterized in that: The compression refrigeration circuit further comprises a maintenance valve, which is fixedly arranged between the hot fluid outlet of the second brazed plate exchanger and the input end of the liquid accumulator.

9. 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 dissipating heat from the natural cooling radiator.

10. The modular redundant liquid cooling system according to claim 1, characterized in that: The liquid cooling heat dissipation 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 pipeline, the second end of the electric three-way valve is fixedly connected to the cold fluid inlet of the second brazing plate through a pipeline, and the third end of the electric three-way valve is fixedly connected to the output ends of the plurality of battery liquid cooling plates connected in parallel through a pipeline.

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