High-energy-efficiency cooling liquid loop system with heat regenerator

Abstract

The utility model discloses a high-energy-efficiency cooling liquid loop system with a heat regenerator, which relates to the technical field of cooling systems and comprises a cooling liquid loop, a battery cooler, a battery pack and at least one group of refrigerant loops. The cooling liquid loop and the refrigerant loop pass through the battery cooler, the refrigerant loop comprises a regenerative heat exchanger and an expansion valve, one set of output ends of the battery cooler is connected with one set of input ends of the regenerative heat exchanger, and an air cooling assembly is installed between one set of output ends of the regenerative heat exchanger and the other set of input ends of the regenerative heat exchanger. And the expansion valve is arranged between the other group of output ends of the regenerative heat exchanger and one group of input ends of the battery cooler. The heat exchange regenerator can be used for further cooling by using a low-pressure and low-temperature refrigerant at an outlet of the battery cooler before the refrigerant is cooled by the air-cooled condenser and is completely or incompletely liquefied from a gas state, so that the degree of supercooling is improved; and after the two-phase refrigerant exchanges heat with the cooling liquid through the battery cooler, the heat exchange regenerator uses the medium-temperature and high-pressure liquid refrigerant after the air-cooled condenser to improve the superheat degree.

Description

TECHNICAL FIELD

[0001] The utility model belongs to cooling system technical field, especially relate to a take back heat regenerator high energy efficiency cooling liquid loop system. BACKGROUND

[0002] The whole electrochemical energy storage industry is still in the high-speed development stage. For electrochemical energy storage, operation safety is always the most important topic in the industry, and currently most of the lithium batteries are used as the main energy storage. Temperature control plays an extremely important role in ensuring the safe operation of lithium batteries. Therefore, temperature control around the lithium battery system is particularly important. Accurate temperature control can prolong the service life of lithium batteries and increase the number of charge and discharge cycles. In the operation process of the energy storage unit, in order to maintain the stability of the battery temperature, the battery needs to be heated or cooled, and this action needs to consume a certain amount of electric energy. The ratio of the refrigeration capacity provided for the energy storage battery cooling to the power consumption required by the refrigeration system is called the energy efficiency ratio. An efficient system cooling scheme can reduce system operation power consumption, improve energy efficiency ratio, reduce operation cost, and achieve economic optimization.

[0003] In the current existing system scheme, a fixed frequency or variable frequency compressor system is generally used to cool the cooling liquid by the low-temperature refrigerant at the evaporation end, and the cooling liquid absorbs heat from the energy storage battery. Generally, in order to ensure that the refrigerant at the inlet of the compressor is in a gaseous state, the refrigerant at this position is controlled to have a certain degree of superheat. The existence of superheat is not an efficient performance for heat exchange of the plate heat exchanger. The dryness of the refrigerant at the outlet of the plate heat exchanger is preferably about 95%, and the existence of superheat will reduce the overall energy efficiency ratio of the system. UTILITY MODEL CONTENTS

[0004] In view of the problems mentioned in the background art, the purpose of the utility model is to provide a high energy efficiency cooling liquid loop system with a regenerator to solve the problems mentioned in the above background art.

[0005] The above technical purpose of the utility model is realized by the following technical scheme:

[0006] A high energy efficiency cooling liquid loop system with a regenerator, comprising a cooling liquid loop, a battery cooler, a battery pack and at least one set of refrigerant circuit; the cooling liquid loop and the refrigerant circuit pass through the battery cooler, the refrigerant circuit comprises a regenerative heat exchanger and an expansion valve, one output end of the battery cooler is connected with one input end of the regenerative heat exchanger, a wind cooling assembly is installed between one output end of the regenerative heat exchanger and the other input end, and the expansion valve is installed between the other output end of the regenerative heat exchanger and one input end of the battery cooler.

[0007] As a preferred technical solution, the cooling liquid circuit comprises a cooling liquid pump and an expansion tank; an output end of the cooling liquid pump is connected with one set of input ends of the battery cooler, one set of output ends of the battery cooler is connected with a water inlet of the battery pack, a water outlet of the battery pack is connected with the expansion tank, and the other end of the expansion tank is connected with an input end of the cooling liquid pump.

[0008] As a preferred technical solution, temperature sensor one and pressure sensor one are installed between the expansion tank and the water outlet; temperature sensor two and pressure sensor two are installed between the battery cooler and the water inlet.

[0009] As a preferred technical solution, the refrigerant circuit further comprises a compressor and a liquid storage tank, the compressor is installed between one set of output ends of the heat recovery heat exchanger and the air-cooled assembly, and the liquid storage tank is installed between one set of input ends of the heat recovery heat exchanger and the air-cooled assembly.

[0010] As a preferred technical solution, a high-pressure filling port is installed between an output port of the air-cooled condenser and the liquid storage tank, and a low-pressure filling port is installed between an output end of the heat recovery heat exchanger and an input end of the compressor.

[0011] As a preferred technical solution, a set of temperature and pressure sensor one and a set of temperature and pressure sensor two are installed at two ends of the compressor.

[0012] As a preferred technical solution, the air-cooled assembly comprises the air-cooled condenser and a cooling fan, two ends of the air-cooled condenser are connected with the compressor and the liquid storage tank respectively, and an air outlet of the cooling fan is directed to the air-cooled condenser.

[0013] As a preferred technical solution, a low-pressure filling port is installed between the heat recovery heat exchanger and the compressor, and a high-pressure filling port is installed between the air-cooled condenser and the liquid storage tank.

[0014] Advantages

[0015] The heat recovery heat exchanger can use the low-pressure and low-temperature refrigerant at the outlet of the battery cooler to further lower the temperature and improve the supercooling degree before the refrigerant is completely or incompletely liquefied after being cooled by the air-cooled condenser; after the two-phase refrigerant is heat-exchanged with the cooling liquid in the battery cooler, the heat recovery heat exchanger uses the liquid refrigerant at the medium temperature and high pressure after the air-cooled condenser to improve the superheating degree, so that the superheating degree at the outlet of the battery cooler is changed into the superheating degree at the outlet of the heat recovery heat exchanger, thereby further reducing the superheating degree at the outlet of the battery cooler, improving the utilization efficiency of the refrigerant phase change heat of the battery cooler, and improving the overall energy efficiency ratio of the system.

[0016] Additional aspects and advantages of the present application will be given in part in the following description, some of which will become apparent from the following description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1A single refrigerant circuit principle diagram of a high energy efficiency cooling liquid loop system with a regenerator is provided in the utility model.

[0018] Figure 2 A double refrigerant circuit principle diagram of a high energy efficiency cooling liquid loop system with a regenerator is provided in the utility model.

[0019] Figure 3 It is a comparison chart of the superheat degree of the battery cooler outlet without the regenerator control and the superheat degree of the regenerator outlet with the regenerator control.

[0020] The figure mark: 110. Cooling liquid pump;111. Expansion tank;112. Battery cooler;113. Battery pack;114. Temperature sensor one;115. Pressure sensor one;116. Water return port;117. Temperature sensor two;118. Pressure sensor two;119. Water inlet;210. Compressor;211. Temperature and pressure sensor one;212. Condenser;213. High pressure filling port;214. Liquid storage tank;215. Temperature and pressure sensor two;216. Low pressure filling port;217. Regenerative heat exchanger;218. Expansion valve;310. Cooling fan. DETAILED DESCRIPTION

[0021] The embodiments of the utility model are described in detail below, the examples of the embodiments are represented in the drawings, wherein the same or similar symbols represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the utility model, and cannot be understood as the limitation of the utility model.

[0022] Embodiment 1

[0023] Reference Figure 1 The high energy efficiency cooling liquid loop system with a regenerator comprises a cooling liquid loop, a battery cooler 112, a battery pack 113 and a refrigerant circuit;The cooling liquid loop and the refrigerant circuit pass through the battery cooler 112, the refrigerant circuit comprises a regenerative heat exchanger 217 and an expansion valve 218, one group of output ends of the battery cooler 112 is connected with one group of input ends of the regenerative heat exchanger 217, a wind cooling assembly is installed between one group of output ends of the regenerative heat exchanger 217 and another group of input ends, and the expansion valve 218 is installed between another group of output ends of the regenerative heat exchanger 217 and one group of input ends of the battery cooler 112.

[0024] Compared with the traditional refrigerant circuit, the refrigerant is further cooled by the regenerative heat exchanger 217, the cooling effect is increased, the refrigerant enters the battery cooler 112 to cool the cooling liquid, the cooling liquid circulates through the cooling liquid loop to cool the battery pack 113, the supercooling degree of the condensing end of the battery cooler 112 is improved, and the heat exchange effect of the condensing end is enhanced.

[0025] The cooling liquid circuit comprises a cooling liquid pump 110 and an expansion tank 111; the output end of the cooling liquid pump 110 is connected with one set of input ends of a battery cooler 112, one set of output ends of the battery cooler 112 is connected with a water inlet 119 of a battery pack 113, a water outlet 116 of the battery pack 113 is connected with the expansion tank 111, and the other end of the expansion tank 111 is connected with the input end of the cooling liquid pump 110.

[0026] Preferably, a temperature sensor one 114 and a pressure sensor one 115 are installed between the expansion tank 111 and the water outlet 116; a temperature sensor two 117 and a pressure sensor two 118 are installed between the battery cooler 112 and the water inlet 119.

[0027] The cooling liquid circuit: the cooling liquid pump 110 provides the operating pressure of the cooling liquid, the cooling liquid flows out of the cooling liquid pump 110, enters the battery cooler 112, exchanges heat with the low-temperature refrigerant in the refrigerant circuit, the temperature of the cooling liquid is lowered, enters the battery pack 113 from the water inlet 119, absorbs the heat of the battery pack in the battery pack 113, and reenters the cooling liquid pump 110 through the expansion tank 111 via the water outlet 116, forming a loop. The expansion tank 111 is used to balance the gas pressure, preventing the change of the gas pressure during the circulation of the cooling liquid from causing the pipe to burst. The temperature sensor one 114 and the pressure sensor one 115 detect the temperature and pressure of the cooling liquid entering the cooling liquid circuit, respectively, and the temperature sensor two 117 and the pressure sensor two 118 detect the temperature and pressure of the cooling liquid entering the battery pack 113, respectively.

[0028] The refrigerant circuit further comprises a compressor 210 and a liquid storage tank 214, the compressor 210 is installed between one set of output ends of a heat recovery heat exchanger 217 and an air-cooled assembly, and the liquid storage tank 214 is installed between one set of input ends of the heat recovery heat exchanger 217 and the air-cooled assembly.

[0029] Preferably, a high-pressure filling port 213 is installed between the output port of the air-cooled condenser and the liquid storage tank 214, and a low-pressure filling port 216 is installed between the output end of the heat recovery heat exchanger 217 and the input end of the compressor 210.

[0030] Preferably, a set of temperature and pressure sensor one 211 and a set of temperature and pressure sensor two 215 are respectively installed at both ends of the compressor 210.

[0031] The air-cooled assembly comprises an air-cooled condenser 212 and a cooling fan 310, both ends of the air-cooled condenser 212 are connected with the compressor 210 and the liquid storage tank 214, respectively, and the air outlet of the cooling fan 310 is directed towards the air-cooled condenser 212.

[0032] Refrigerant circuit: low-temperature and low-pressure gaseous refrigerant is output from the regenerative heat exchanger 217 into the compressor 210, the temperature and pressure in the pipeline before entering the compressor 210 are detected by the temperature and pressure sensor two 215, the compressor 210 compresses the low-pressure refrigerant into high-pressure and low-temperature gaseous refrigerant, and the temperature and pressure in the pipeline at this time are detected by the temperature and pressure sensor one 211, the high-pressure and low-temperature gaseous refrigerant enters the air-cooled condenser 212 and exchanges heat with the flowing air outside, becoming medium-temperature and high-pressure incomplete liquid and liquid refrigerant, the cooling fan 310 works to cool the air-cooled condenser 212, the medium-temperature and high-pressure liquid refrigerant output from the air-cooled condenser 212 enters the regenerative heat exchanger 217 from the liquid tank 214 and exchanges heat with the low-temperature gaseous refrigerant output from the battery cooler 112 to cool the liquid refrigerant, the medium-temperature and high-pressure liquid refrigerant is further cooled and decompressed by the throttling of the expansion valve 218 to become low-temperature and low-pressure two-phase refrigerant, which reenters the battery cooler 112 to cool the cooling liquid, the two-phase refrigerant absorbs heat to become low-temperature and low-pressure gaseous refrigerant and reenters the regenerative heat exchanger 217 to cool the liquid refrigerant entering from the liquid tank 214, and the gaseous refrigerant after heat exchange enters the compressor 210 to form a closed cycle.

[0033] The regenerative heat exchanger 217 functions in that: before the refrigerant is cooled by the air-cooled condenser 212 to change from gaseous state to liquid state, the regenerative heat exchanger 217 uses the low-pressure and low-temperature refrigerant at the outlet of the battery cooler 112 to further cool it and improve the supercooling degree; after the two-phase refrigerant exchanges heat with the cooling liquid in the battery cooler 112, the regenerative heat exchanger 217 uses the medium-temperature and high-pressure liquid refrigerant after the air-cooled condenser 212 to improve the superheating degree, which can change the superheating degree at the outlet of the battery cooler 112 to the superheating degree at the outlet of the regenerative heat exchanger 217 from the control strategy, thereby further reducing the superheating degree at the outlet of the battery cooler 112, improving the utilization efficiency of the refrigerant phase change heat of the battery cooler 112, and improving the overall energy efficiency ratio of the system.

[0034] Preferably, a low-pressure filling port 216 is installed between the regenerative heat exchanger 217 and the temperature and pressure sensor two 215, and a high-pressure filling port 213 is installed between the air-cooled condenser 212 and the liquid tank 214.

[0035] When there is a lack of refrigerant before the cycle starts or after the cycle ends, the refrigerant can be added through the high-pressure filling port 213 and the low-pressure filling port 216.

[0036] Embodiment 2

[0037] Reference Figure 2The high-energy-efficiency cooling liquid loop system with the heat regenerator of the embodiment comprises two groups of refrigerant loops, the two groups of refrigerant loops are identical in structure, input ends of heat regenerator heat exchangers 217 of the two groups of refrigerant loops are connected with two groups of output ends of the battery cooler 112 respectively, and two groups of input ends of the battery cooler 112 are connected with output ends of the expansion valves 218 of the two groups of refrigerant loops respectively.

[0038] The refrigerant loop with the heat regenerator 217 and the traditional refrigerant loop without the heat regenerator 217 are respectively experimented, and the system COP comparison as shown in Figure 3

[0039] It should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0040] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified.

[0041] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0042] ​In the utility model, unless another definite provision and limitation, first feature is on second feature "on" or "under" can be first and second feature direct contact, or first and second feature indirectly contact through intermediate medium. Moreover, first feature is on second feature "on", "above" and "on" can be first feature is on second feature directly or obliquely, or only indicate first feature horizontal height is higher than second feature. First feature is on second feature "under", "below" and "under" can be first feature is on second feature directly or obliquely, or only indicate first feature horizontal height is less than second feature.

[0043] The above merely describes a preferred specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art in the technical range disclosed by the utility model, according to the technical scheme and utility model concept of the utility model, equivalent replacement or change, should be covered in the protection scope of the utility model.

Claims

1. A high-efficiency coolant circuit system with a regenerator, characterized by: The invention comprises a cooling liquid circuit, a battery cooler (112), a battery pack (113) and at least one refrigerant circuit; the cooling liquid circuit and the refrigerant circuit both pass through the battery cooler (112); the refrigerant circuit comprises a heat recovery heat exchanger (217) and an expansion valve (218); one group of output ends of the battery cooler (112) is connected to a group of input ends of the heat recovery heat exchanger (217); an air cooling component is installed between one group of output ends and another group of input ends of the heat recovery heat exchanger (217); and the expansion valve (218) is installed between the other group of output ends of the heat recovery heat exchanger (217) and one group of input ends of the battery cooler (112).

2. The high-efficiency coolant circuit system with a regenerator according to claim 1, characterized in that: The coolant circuit comprises a coolant pump (110) and an expansion tank (111); the output end of the coolant pump (110) is connected to one group of input ends of a battery cooler (112), one group of output ends of the battery cooler (112) is connected to a water inlet (119) of a battery pack (113), a water outlet (116) of the battery pack (113) is connected to the expansion tank (111), and the other end of the expansion tank (111) is connected to the input end of the coolant pump (110).

3. The high-efficiency coolant circuit system with a regenerator according to claim 2, characterized in that: A temperature sensor 1 (114) and a pressure sensor 1 (115) are installed between the expansion tank (111) and the water outlet (116); a temperature sensor 2 (117) and a pressure sensor 2 (118) are installed between the battery cooler (112) and the water inlet (119).

4. The high-efficiency coolant circuit system with a regenerator according to claim 1 is characterized in that: The refrigerant circuit further includes a compressor (210) and a liquid storage tank (214), wherein the compressor (210) is installed between a group of output ends of the heat recovery heat exchanger (217) and an air cooling component, and the liquid storage tank (214) is installed between a group of input ends of the heat recovery heat exchanger (217) and the air cooling component.

5. The high-efficiency coolant circuit system with a regenerator according to claim 4 is characterized in that: A high-pressure filling port (213) is installed between the output port of the air-cooled condenser and the liquid storage tank (214), and a low-pressure filling port (216) is installed between the output end of the heat recovery heat exchanger (217) and the input end of the compressor (210).

6. The high-energy-efficiency coolant circuit system with a regenerator according to claim 4, characterized in that: A set of temperature and pressure sensor 1 (211) and temperature and pressure sensor 2 (215) are respectively installed at both ends of the compressor (210).

7. The high-efficiency coolant circuit system with a regenerator according to claim 4, characterized in that: The air-cooling assembly comprises an air-cooling condenser (212) and a cooling fan (310). Two ends of the air-cooling condenser (212) are respectively connected to the compressor (210) and the liquid storage tank (214). The air outlet of the cooling fan (310) faces the air-cooling condenser (212).

8. The high-efficiency coolant circuit system with a regenerator according to claim 4, characterized in that: A low-pressure filling port (216) is installed between the regenerative heat exchanger (217) and the compressor (210), and a high-pressure filling port (213) is installed between the air-cooled condenser (212) and the liquid storage tank (214).

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