A liquid-cooled energy storage and thermal management integrated machine

Abstract

This utility model relates to an integrated liquid-cooled energy storage and thermal management unit. The unit contains a refrigerant system and a coolant system, with an electrical control system located at one end. The refrigerant system consists of a compressor, condenser, receiver, economizer, and evaporator connected in series. The main outlet of the economizer is connected to the evaporator via a main electronic expansion valve, and the auxiliary outlet of the economizer is connected to the compressor's gas injection inlet. The coolant structure includes an evaporator-side coolant circulation structure and a condenser-side coolant circulation structure. In use, this utility model employs a single compressor, featuring small size, oil-free lubrication, and high energy efficiency. It also boasts advantages such as large cooling capacity, small size, and low vibration. Due to the use of a single compressor, the structure is simpler, the possibility of leakage is greatly reduced, safety is improved, and equipment operation is more stable.

Description

Technical Field

[0001] This utility model relates to the technical field of energy storage thermal management, specifically to an integrated liquid-cooled energy storage thermal management unit. Background Technology

[0002] In existing technologies, liquid chillers for this type of energy storage container employ a separate control and main unit design due to space constraints. The control box is placed in another area of ​​the container, making on-site wiring extremely inconvenient. Furthermore, due to structural limitations, these products typically use a small compressor to build a dual-compressor system, resulting in a larger size, more complex piping, higher costs, and significant space consumption. Additionally, their energy efficiency is lower. The dual-compressor system requires additional oil equalization and pressure equalization piping, and combined with the dual system itself, this nearly doubles the number of welding points, greatly increasing the risk of refrigerant leakage.

[0003] Therefore, there is an urgent need in the market for a new type of energy storage thermal management product. Summary of the Invention

[0004] The purpose of this utility model is to provide an improved liquid-cooled energy storage and thermal management integrated machine. Through structural improvements, it can achieve the effects of large cooling capacity, small size, low vibration, and high integration.

[0005] To achieve the above objectives, the technical solution of this utility model is: a liquid-cooled energy storage and thermal management integrated machine, comprising a housing, characterized in that: a refrigerant system and a coolant system are provided inside the housing, and an electrical control system is provided at one end of the housing; the refrigerant system consists of a compressor, a condenser, a liquid receiver, an economizer, and an evaporator connected in series, the main outlet of the economizer is connected to the evaporator through a main electronic expansion valve, and the auxiliary outlet of the economizer is connected to the gas injection inlet of the compressor; the coolant structure includes an evaporator-side coolant circulation structure and a condenser-side coolant circulation structure.

[0006] Preferably, the evaporator-side coolant circulation structure includes an evaporator-side water pump, an evaporator, and an energy storage battery. The evaporator-side water pump, evaporator, and energy storage battery are connected in sequence to form a closed loop. The circulation structure also includes an evaporator-side pressure relief and coolant replenishment structure.

[0007] Furthermore, the condenser-side coolant circulation structure includes a condenser-side water pump, a condenser, and a dry cooler. The condenser-side water pump, condenser, and dry cooler are connected in sequence to form a closed loop. The circulation structure also includes a condenser-side pressure relief and liquid replenishment structure.

[0008] Furthermore, the evaporator is equipped with a refrigerant inlet and a refrigerant outlet. The compressor outlet is connected to the condenser inlet, the condenser outlet is connected to the receiver inlet, the receiver outlet is connected to the economizer main circuit inlet, the economizer main circuit outlet is connected to the main circuit electronic expansion valve inlet, the main circuit electronic expansion valve outlet is connected to the evaporator refrigerant inlet, and the evaporator refrigerant outlet is connected to the compressor inlet. The make-up gas circuit electronic expansion valve inlet is connected to the main circuit electronic expansion valve inlet, and the make-up gas circuit electronic expansion valve outlet is connected to the economizer auxiliary circuit inlet. The compressor is equipped with an intermediate stage make-up gas interface for connecting to the exhaust gas from the economizer.

[0009] Furthermore, the evaporation-side pressure relief and liquid replenishment structure includes an evaporation-side water tank, an evaporation-side pressure relief pipe, and an evaporation-side water replenishment pipe; one end of the evaporation-side water replenishment pipe is connected to the bypass liquid replenishment interface of the front end pipe of the evaporation-side water pump, and the other end is connected to the liquid replenishment interface of the evaporation-side water tank; one end of the evaporation-side pressure relief pipe is connected to the pressure relief valve of the rear end pipe of the evaporator, and the other end is connected to the pressure relief interface of the evaporation-side water tank; the evaporation-side water tank includes a kettle body and a kettle lid, and the kettle lid has a pressure relief valve structure.

[0010] Furthermore, the condenser-side pressure relief and liquid replenishment structure includes a condenser-side water tank, a condenser-side pressure relief pipe, and a condenser-side water replenishment pipe; one end of the condenser-side water replenishment pipe is connected to the bypass liquid replenishment interface of the front end pipe of the condenser-side water pump, and the other end is connected to the liquid replenishment interface of the condenser-side water tank; one end of the condenser-side pressure relief pipe is connected to the pressure relief valve in the rear end pipe of the condenser, and the other end is connected to the pressure relief interface of the condenser-side water tank; the condenser-side water tank includes a kettle body and a kettle lid, and the kettle lid has a pressure relief valve structure.

[0011] Furthermore, a water pipe is connected to the bottom of the condensate tank, and a replenishment pump is connected to the water pipe. Compressor pressure and temperature sensors are installed on the compressor's outlet pipe. Rolling casters are located at the bottom of the housing, and lifting rings are located at the top of the housing.

[0012] Compared with the prior art, the technical solution of this utility model not only improves the overall technical solution, but also includes many detailed improvements. Specifically, it has the following beneficial effects: The improved solution described in this utility model includes a refrigerant system and a coolant system inside the housing, with an electronic control system at one end of the housing. The refrigerant system consists of a compressor, condenser, receiver, economizer, and evaporator connected in series. The main outlet of the economizer is connected to the evaporator via a main electronic expansion valve, and the auxiliary outlet of the economizer is connected to the compressor's gas inlet. The coolant structure includes an evaporator-side coolant circulation structure and a condenser-side coolant circulation structure. The entire structure is an integrated and compact layout, achieving the effects of large cooling capacity, small size, and low vibration. In the technical solution of this utility model, a single compressor and a single system structure are used, reducing the number of refrigeration pipe fittings, making the whole system simpler, more efficient, and reducing costs; In the structure of this utility model, the compressor is provided with an intermediate stage air inlet, which can be connected to the exhaust gas from the economizer to cool the exhaust gas of the low-pressure impeller, reduce the compression power consumption of the high-pressure impeller, and thus improve the energy efficiency of the system. This utility model has a simple structure, reasonable layout, is easy to use, has a low risk of leakage, is stable and safe to operate, and is easy to promote and utilize. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] Figure 2 This is another structural schematic diagram of the present utility model.

[0015] Figure 3 This is a schematic diagram of the refrigerant system of this utility model.

[0016] Figure 4 This is a schematic diagram of the coolant system of this utility model.

[0017] Figure label: 1. Rolling pulleys; 2. Electrical control system; 3. Refrigerant system; 4. Coolant system; 5. Lifting rings; 6. Enclosure. 31 Compressor, 32 Condenser, 33 Liquid receiver, 34 Economizer, 35 Evaporator, 36 Main circuit electronic expansion valve, 37 Solenoid valve, 38 Make-up gas circuit electronic expansion valve; 41 Evaporation-side water pump, 43 Evaporation-side water tank, 44 Condensation-side water pump, 45 Condensation-side water tank, 46 Make-up pump, 47 Electric heater. Detailed Implementation

[0018] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0019] This utility model provides a liquid-cooled energy storage and thermal management integrated machine, including a housing 6, as detailed below. Figure 1 The difference between this and the existing technology is that: the housing is equipped with a refrigerant system 3 and a coolant system 4, and an electronic control system 2 is located at one end of the housing; the refrigerant system consists of a compressor 31, a condenser 32, a liquid receiver 33, an economizer 34, and an evaporator 35 connected in series; the main outlet of the economizer is connected to the evaporator through a main electronic expansion valve 36, and the auxiliary outlet of the economizer is connected to the compressor's gas inlet; the coolant structure includes an evaporator-side coolant circulation structure and a condenser-side coolant circulation structure.

[0020] In use, this utility model employs a single compressor, making it a highly integrated liquid-cooled energy storage management unit. It utilizes an oil-free centrifugal compressor with a maximum speed of 120,000 rpm. Compared to traditional scroll or rotary compressors, it features smaller size, oil-free lubrication, and higher energy efficiency. It also boasts advantages such as large cooling capacity, small size, and low vibration. Due to the use of a single compressor, the structure is simpler, significantly reducing the possibility of leakage, improving safety, and ensuring more stable equipment operation.

[0021] Example 1 This embodiment describes a liquid-cooled energy storage thermal management integrated unit, including a housing 6, as detailed in the following document. Figure 1 The housing contains a refrigerant system 3 and a coolant system 4, and an electrical control system 2 is located at one end of the housing. The refrigerant system consists of a compressor 31, a condenser 32, a liquid receiver 33, an economizer 34, and an evaporator 35 connected in series. The main outlet of the economizer is connected to the evaporator through a main electronic expansion valve 36, and the auxiliary outlet of the economizer is connected to the compressor's gas inlet.

[0022] Further, see Figure 3 The refrigerant system is designed based on the characteristics of a small-capacity, high-speed air-float centrifugal compressor. An economizer is used to supply gas to the compressor, increasing the system's subcooling, reducing compressor power consumption, and thus improving overall energy efficiency. Simultaneously, considering the surge phenomenon of high-speed centrifugal compressors, a solenoid valve 37 is added to bypass the compressor's intake and exhaust, thereby preventing compressor surge. All components are connected by copper pipes, with pipe diameters matched according to system flow rate, design pressure, and design temperature (this part is existing technology, so its working principle will not be elaborated further). The connection sequence of each component is as follows: compressor outlet connected to condenser inlet; condenser outlet connected to receiver condenser inlet; receiver condenser outlet connected to economizer main inlet; economizer main outlet connected to main electronic expansion valve inlet; main electronic expansion valve outlet connected to evaporator refrigerant inlet; evaporator refrigerant outlet connected to compressor inlet; gas supply electronic expansion valve 38 inlet connected to main electronic expansion valve inlet; gas supply electronic expansion valve outlet connected to economizer auxiliary inlet; economizer auxiliary inlet connected to compressor gas supply inlet.

[0023] The specific working principle is as follows: The centrifugal compressor acts as the power source for the refrigerant in the system, compressing the refrigerant centrifugally. The compressed, high-temperature refrigerant then travels through pipelines to the condenser. Simultaneously, a water pump pumps coolant into the coolant side of the condenser. The condenser exchanges heat between the high-temperature refrigerant and the coolant. The condensed refrigerant then travels through pipelines to the filter, which removes impurities from the system. The filtered refrigerant then enters the main electronic expansion valve, which throttles the refrigerant. The throttled refrigerant rapidly expands and enters the plate evaporator. In the plate evaporator, the throttled refrigerant absorbs heat from the coolant, thus lowering the coolant to the desired temperature. After evaporation, the refrigerant returns to the compressor. Pressure and temperature sensors are also installed on the compressor outlet pipeline and the plate evaporator outlet pipeline. These sensors are used to calculate the system's cooling demand and for system operation protection.

[0024] The coolant structure includes an evaporator-side coolant circulation structure and a condenser-side coolant circulation structure. The electrical control system 2 here is existing technology, mainly comprising intermediate relays, AC contactors, power filters, expansion valve drivers, a main control board, and a 24V switching power supply. The electrical control system is directly installed within the enclosure, achieving an integrated design that eliminates the need for on-site wiring, making it more convenient to use.

[0025] Specifically, the evaporator-side coolant circulation structure includes an evaporator-side water pump 41 and an evaporator 35. The evaporator-side water pump, evaporator, and external energy storage battery are connected sequentially to form a closed loop. The evaporator is an external device, and this structure is existing technology, so it is not shown in the drawings. Its specific working principle and structure will not be described in detail here. The circulation structure also includes an evaporator-side pressure relief and replenishment structure. The evaporator-side pressure relief and replenishment structure includes an evaporator-side water tank 43, an evaporator-side pressure relief pipe, and an evaporator-side water replenishment pipe. One end of the evaporator-side water replenishment pipe is connected to the bypass replenishment interface of the front end pipe of the evaporator-side water pump, and the other end is connected to the replenishment interface of the evaporator-side water tank. One end of the evaporator-side pressure relief pipe is connected to the pressure relief valve of the rear end pipe of the evaporator, and the other end is connected to the pressure relief interface of the evaporator-side water tank. The evaporator-side water tank includes a tank body and a tank lid, and the tank lid has a pressure relief valve structure.

[0026] Furthermore, the condenser-side coolant circulation structure includes a condenser-side water pump 44, a condenser 32, and a dry cooler. The condenser-side water pump, condenser, and dry cooler are connected sequentially to form a closed loop. The dry cooler is an external device, and this structure is existing technology, so it is not shown in the drawings. Its specific working principle and structure will not be elaborated here. The circulation structure also includes a condenser-side pressure relief and replenishment structure. The condenser-side pressure relief and replenishment structure includes a condenser-side water tank 45, a condenser-side pressure relief pipe, and a condenser-side water replenishment pipe. One end of the condenser-side water replenishment pipe is connected to the bypass replenishment interface of the front-end pipe of the condenser-side water pump, and the other end is connected to the replenishment interface of the condenser-side water tank. One end of the condenser-side pressure relief pipe is connected to the pressure relief valve in the rear-end pipe of the condenser, and the other end is connected to the pressure relief interface of the condenser-side water tank. The condenser-side water tank includes a body and a lid, and the lid has a pressure relief valve structure.

[0027] Furthermore, the refrigerant cycle structure mainly includes a compressor, condenser, main electronic expansion valve, evaporator, economizer, receiver, filter, and make-up gas electronic expansion valve. The evaporator has a refrigerant inlet and a refrigerant outlet. The compressor outlet is connected to the condenser inlet, the condenser outlet to the receiver inlet, the receiver outlet to the economizer main inlet, the economizer main outlet to the main electronic expansion valve inlet, the main electronic expansion valve outlet to the evaporator refrigerant inlet, and the evaporator refrigerant outlet to the compressor inlet. The make-up gas electronic expansion valve inlet is connected to the main electronic expansion valve inlet, and the make-up gas electronic expansion valve outlet is connected to the economizer auxiliary inlet. The compressor has an intermediate-stage make-up gas interface for connecting the exhaust gas from the economizer. This interface cools the exhaust gas from the low-pressure impeller, reduces the compression power consumption of the high-pressure impeller, and thus improves the overall energy efficiency of the system.

[0028] Furthermore, a water pipe is connected to the bottom of the condensate tank, and a replenishment pump 46 is connected to the water pipe. A compressor pressure and temperature sensor is installed on the compressor's outlet pipe. Rolling casters 1 are located at the bottom of the housing, and a lifting ring 5 is located at the top of the housing. The compressor is an oil-free centrifugal compressor.

[0029] This utility model utilizes an oil-free centrifugal compressor, a technology already in use. It employs high-speed air-float centrifugal compressor technology, achieving a maximum compressor speed of 120,000 rpm. It features small size, oil-free lubrication, and high energy efficiency. The unit boasts low power consumption and significant energy efficiency advantages, resulting in a more compact and efficient design. Specifically, it offers the following advantages: a) High energy efficiency significantly reduces refrigeration power consumption, allowing for a compact condenser; b) The oil-free system eliminates the need for oil return issues, simplifying piping design; c) Compared to scroll or rotary compressors, it exhibits minimal vibration, simplifies installation, eliminates the need for additional compressor vibration damping mounts, and ensures more stable compressor operation; d) Air suspension and zero wear during operation result in a longer service life, less maintenance, and reduced operating costs.

[0030] Example 2 In this embodiment, the specific structure of the liquid-cooled energy storage management integrated unit is as follows: The housing contains a refrigerant system and a coolant system, with an electrical control system located at one end of the housing. The refrigerant system consists of a compressor, condenser, receiver, economizer, and evaporator connected in series. The main outlet of the economizer is connected to the evaporator via a main electronic expansion valve, and the auxiliary outlet of the economizer is connected to the compressor's gas injection inlet. The coolant structure includes an evaporator-side coolant circulation structure and a condenser-side coolant circulation structure. This invention simultaneously possesses the advantages of large cooling capacity, small size, and low vibration. Due to the use of a single compressor, the structure is simpler, the possibility of leakage is greatly reduced, safety is improved, equipment operation is more stable, and service life is extended.

[0031] In the evaporator-side coolant circulation structure, the evaporator-side water pump serves as the power source for coolant circulation. The pump is connected to the plate evaporator via water pipes, delivering coolant into the evaporator (to improve heat exchange efficiency, the coolant flow direction is opposite to the refrigerant flow direction in the plate evaporator). After transferring heat to the refrigerant, the coolant connects to the inlet of the electric heater 47 via water pipes, and then enters the energy storage battery through pipelines. In the energy storage battery, the heat generated by the battery cells is transferred back to the coolant, which then returns to the evaporator-side water pump. The coolant circulation also includes an evaporator-side pressure relief and replenishment structure, comprising an evaporator-side water tank, an evaporator-side pressure relief pipe, and an evaporator-side water replenishment pipe. One end of the evaporator-side water replenishment pipe is connected to the bypass replenishment interface of the evaporator-side water pump's front-end pipeline, and the other end is connected to the replenishment interface of the evaporator-side water tank. One end of the evaporator-side pressure relief pipe is connected to the pressure relief valve of the evaporator's rear-end pipeline, and the other end is connected to the pressure relief interface of the evaporator-side water tank. The water tank consists of a body and a lid. The lid has a pressure relief valve. When the pressure reaches the set value, the pressure valve will open, and the evaporative coolant circulation structure will release pressure outward.

[0032] Furthermore, in the condenser-side coolant circulation structure, the condenser-side water pump serves as the power source for coolant circulation. The condenser-side water pump is connected to the plate condenser via water pipes, sending coolant into the plate condenser (to improve heat exchange efficiency, the coolant flow direction is exactly opposite to the refrigerant flow direction in the plate condenser). After heat exchange with the refrigerant, the coolant enters the external dry cooler through pipes. In the external dry cooler, forced heat exchange is achieved by a fan, transferring heat to the air. The coolant then returns to the condenser-side water pump from the external dry cooler. The circulation structure also includes a condenser-side pressure relief and replenishment structure. This structure includes a condenser-side water tank, a condenser-side pressure relief pipe, and a condenser-side water replenishment pipe. One end of the condenser-side water replenishment pipe is connected to the bypass replenishment interface of the front-end pipe of the condenser-side water pump, and the other end is connected to the replenishment interface of the condenser-side water tank. One end of the condenser-side pressure relief pipe is connected to the pressure relief valve in the rear-end pipe of the condenser, and the other end is connected to the pressure relief interface of the condenser-side water tank. The water tank consists of a body and a lid. The lid has a pressure relief valve. When the pressure reaches the set value, the pressure valve opens, and the coolant circulation structure on the condenser side releases pressure.

[0033] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications or substitutions should be considered within the protection scope of the present invention.

Claims

1. A liquid-cooled energy storage and thermal management integrated unit, comprising a housing, characterized in that: The enclosure contains a refrigerant system and a coolant system, and an electrical control system is located at one end of the enclosure. The refrigerant system consists of a compressor, condenser, receiver, economizer, and evaporator connected in series. The main outlet of the economizer is connected to the evaporator through a main electronic expansion valve, and the auxiliary outlet of the economizer is connected to the compressor's gas inlet. The coolant structure includes an evaporator-side coolant circulation structure and a condenser-side coolant circulation structure.

2. The liquid-cooled energy storage and thermal management integrated machine according to claim 1, characterized in that: The evaporator-side coolant circulation structure includes an evaporator-side water pump, an evaporator, and an external energy storage battery. The evaporator-side water pump, evaporator, and energy storage battery are connected in sequence to form a closed loop. The circulation structure also includes an evaporator-side pressure relief and coolant replenishment structure.

3. The liquid-cooled energy storage and thermal management integrated machine according to claim 1, characterized in that: The condenser-side coolant circulation structure includes a condenser-side water pump, a condenser, and an external dry cooler. The condenser-side water pump, condenser, and dry cooler are connected in sequence to form a closed loop. The circulation structure also includes a condenser-side pressure relief and coolant replenishment structure.

4. The liquid-cooled energy storage and thermal management integrated machine according to claim 1, characterized in that: The evaporator has a refrigerant inlet and a refrigerant outlet. The compressor outlet is connected to the condenser inlet, the condenser outlet is connected to the receiver inlet, the receiver outlet is connected to the economizer main circuit inlet, the economizer main circuit outlet is connected to the main circuit electronic expansion valve inlet, the main circuit electronic expansion valve outlet is connected to the evaporator refrigerant inlet, and the evaporator refrigerant outlet is connected to the compressor inlet. The make-up gas circuit electronic expansion valve inlet is connected to the main circuit electronic expansion valve inlet, and the make-up gas circuit electronic expansion valve outlet is connected to the economizer auxiliary circuit inlet. The compressor has an intermediate stage make-up gas interface for connecting to the exhaust gas from the economizer.

5. The liquid-cooled energy storage and thermal management integrated machine according to claim 2, characterized in that: The evaporation-side pressure relief and liquid replenishment structure includes an evaporation-side water tank, an evaporation-side pressure relief pipe, and an evaporation-side water replenishment pipe. One end of the evaporation-side water replenishment pipe is connected to the bypass liquid replenishment interface of the front end pipe of the evaporation-side water pump, and the other end is connected to the liquid replenishment interface of the evaporation-side water tank. One end of the evaporation-side pressure relief pipe is connected to the pressure relief valve of the rear end pipe of the evaporator, and the other end is connected to the pressure relief interface of the evaporation-side water tank. The evaporation-side water tank includes a body and a lid, and the lid has a pressure relief valve structure.

6. The liquid-cooled energy storage and thermal management integrated machine according to claim 3, characterized in that: The condenser-side pressure relief and liquid replenishment structure includes a condenser-side water tank, a condenser-side pressure relief pipe, and a condenser-side water replenishment pipe. One end of the condenser-side water replenishment pipe is connected to the bypass liquid replenishment interface of the front end pipe of the condenser-side water pump, and the other end is connected to the liquid replenishment interface of the condenser-side water tank. One end of the condenser-side pressure relief pipe is connected to the pressure relief valve in the rear end pipe of the condenser, and the other end is connected to the pressure relief interface of the condenser-side water tank. The condenser-side water tank includes a kettle body and a kettle lid, and the kettle lid has a pressure relief valve structure.

7. The liquid-cooled energy storage and thermal management integrated machine according to claim 6, characterized in that: A water pipe is connected to the bottom of the condensate tank, and a replenishment pump is connected to the water pipe.

8. The liquid-cooled energy storage and thermal management integrated machine according to claim 1, characterized in that: The compressor outlet pipe is equipped with compressor pressure and temperature sensors; the bottom of the housing is equipped with rolling pulleys, and the top of the housing is equipped with lifting rings; the compressor is an oil-free centrifugal compressor.

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