Energy storage system with immersed heat management module and dehumidification function

Abstract

The utility model discloses an energy storage system with an immersed heat management module and a dehumidification function. The energy storage system comprises the immersed energy storage heat management module. The immersed energy storage heat management module comprises a first refrigeration module, a second refrigeration module, a cooling module and a dehumidification module. Wherein the first refrigeration module is sequentially provided with a compressor, a first condenser and a throttling element in the flow direction of a refrigerant working medium, the second refrigeration module and the first refrigeration module are arranged in parallel, and the second refrigeration module is sequentially provided with a second condenser and a fluorine pump in the flow direction of the refrigerant working medium. The cooling module comprises a cooling cavity communicating with the first refrigeration module and the second refrigeration module, and a refrigerant working medium enters the cooling cavity and then cools the to-be-cooled module arranged in the cavity. An inlet of the dehumidification module communicates with an inlet of the cooling module, and an outlet communicates with an outlet of the cooling module. According to the immersed energy storage heat management module, different refrigerating circuits can be selected according to different heat exchange amount requirements, and the power consumption is reduced while the heat exchange amount is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of heat management, especially to a kind of energy storage system with immersion heat management module and dehumidification function. BACKGROUND

[0002] Heat management refers to the management and control of the temperature of the total system, discrete components or their environment, and its purpose is to maintain the normal operation of each component or improve its performance or life. Currently, heat management is usually required in fields such as electrochemical energy storage, and heat management has a significant impact on the performance, life and safety of energy storage systems.

[0003] Most of the current heat management systems for energy storage do not have a fluorine pump natural cooling module, but use antifreeze to take away the heat of the battery cells in an indirect heat dissipation manner, and an additional dehumidification air conditioner design is also required for box-type energy storage cabinets. When the heat management unit does not have a natural cooling function, if the unit is under low load conditions, the unit has low energy efficiency and high power consumption, and the unit is prone to frequent start-stop, affecting the service life of the system. And because there is no natural cooling function, the internal system of the unit runs for a long time, which also shortens the service life of the entire machine and reduces the investment return ratio. To solve this problem, some heat management systems currently have integrated natural cooling functions, which mainly add a second heat exchanger near the condenser to exchange heat through cooling liquid. The disadvantage of this method is that the fan has high back pressure, high fan speed and high noise. The cooling liquid circuit has many interfaces, and the risk of cooling liquid leakage is high. In addition, in these heat management methods, the temperature of the battery cells is taken away by antifreeze, and this cooling method has secondary heat exchange, low system heat dissipation efficiency, and the energy storage cabinet often needs to be equipped with an additional dehumidification air conditioner, which is not economical and occupies space, and the control is also more complicated. SUMMARY

[0004] To solve some or all of the problems in the prior art, the utility model provides an energy storage system with an immersion heat management module and dehumidification function, which includes an immersion energy storage heat management module, the immersion energy storage heat management module includes:

[0005] A first refrigeration module, which is provided with a compressor, a first condenser and a throttling element in sequence along the flow direction of the refrigerant working medium;

[0006] A second refrigeration module, which is provided with a second condenser and a fluorine pump in sequence along the flow direction of the refrigerant working medium and is arranged in parallel with the first refrigeration module;

[0007] A cooling module, which includes a cooling cavity, the cooling cavity is in communication with the first refrigeration module and the second refrigeration module, and the refrigerant working medium enters the cooling cavity to cool the to-be-cooled module arranged inside the cavity; and

[0008] a control module configured to control the first and second refrigeration modules according to the heat exchange requirement.

[0009] Further, the first refrigeration module and the second refrigeration module share a condenser.

[0010] Further, the second refrigeration module further comprises:

[0011] a one-way valve having an inlet end connected to the outlet of the cooling module and an outlet end connected to the inlet of the second condenser; and

[0012] a first electromagnetic valve disposed at the inlet of the fluorine pump.

[0013] Further, the immersion energy storage thermal management system further comprises a first fan disposed at the first and / or second condenser to introduce normal temperature air into the first and / or second condenser for heat exchange.

[0014] Further, the immersion energy storage thermal management system further comprises:

[0015] a dehumidification module having an inlet in communication with the inlet of the cooling module and an outlet in communication with the outlet of the cooling module, and configured to dehumidify and exchange heat with the immersion energy storage thermal management system.

[0016] Further, the dehumidification module comprises a dehumidification heat exchanger.

[0017] Further, the dehumidification module further comprises a second electromagnetic valve disposed at the inlet of the dehumidification heat exchanger.

[0018] Further, the dehumidification module further comprises a second fan disposed at the dehumidification heat exchanger to introduce normal temperature air into the dehumidification heat exchanger for heat exchange.

[0019] Further, the throttling element is an electronic expansion valve.

[0020] Further, the immersion energy storage thermal management system further comprises at least one temperature sensor and at least one pressure sensor, wherein the temperature sensor and the pressure sensor are disposed at the inlet and / or outlet of the compressor.

[0021] The utility model provides a kind of with submerged heat management module and dehumidification function's energy storage system, it can be according to the demand of different heat exchange capacity, select different refrigeration circuit, while guaranteeing heat exchange capacity, as far as possible reduce power consumption.Specifically, same heat exchange capacity, same evaporation pressure, the latent heat of vaporization Δh in evaporator in fluorine pump circuit is greater, and refrigerant mass flow is less, so at low load, fluorine pump circuit is used.At low load, fluorine pump circuit power consumption is far less than compressor circuit, and fluorine pump circuit is more energy efficient.In addition, fluorine pump road can also reduce the cost and space occupancy of second heat exchanger, reduce fan noise, and can prevent the risk of antifreeze leakage.And at high load, when heat exchange capacity demand is higher, then select using compressor circuit, or fluorine pump circuit and compressor circuit are opened simultaneously.In addition, the submerged energy storage heat management system adopts submerged cooling mode, can prevent the risk of antifreeze leakage, and effectively improve system energy efficiency.The system as a whole also integrates dehumidification function, and can cancel additional dehumidification air conditioner configuration. BRIEF DESCRIPTION OF DRAWINGS

[0022] To further illustrate the above and other advantages and characteristics of the embodiments of the utility model, more specific description of the embodiments of the utility model will be presented with reference to the drawings. It can be understood that these drawings only depict typical embodiments of the utility model, and therefore should not be considered as limiting on its scope. In the drawings, for clarity, same or corresponding components will be denoted by same or similar reference signs.

[0023] Figure 1 Structure schematic view of the submerged energy storage heat management system with multiple refrigeration circuits of one embodiment of the utility model is shown;

[0024] Figure 2 Structure schematic view of the compressor circuit of the submerged energy storage heat management system of one embodiment of the utility model is shown;

[0025] Figure 3 Pressure enthalpy diagram schematic view of the compressor circuit of the submerged energy storage heat management system of one embodiment of the utility model is shown;

[0026] Figure 4 Structure schematic view of the fluorine pump circuit of the submerged energy storage heat management system of one embodiment of the utility model is shown; and

[0027] Figure 5 Pressure enthalpy diagram schematic view of the fluorine pump circuit of the submerged energy storage heat management system of one embodiment of the utility model is shown.

[0028] LIST OF REFERENCE NUMERALS

[0029] 111 compressor

[0030] 112 first condenser

[0031] 113 Throttling element

[0032] 114 First Fan

[0033] 121 Check Valve

[0034] 122 First solenoid valve

[0035] 123 Fluorine Pump

[0036] 124 Second Condenser

[0037] 103 Cooling Module

[0038] 141 Second solenoid valve

[0039] 142 Dehumidification heat exchanger

[0040] 143 Second Fan DETAILED DESCRIPTION

[0041] In the following description, the present invention is described with reference to various embodiments. However, those skilled in the art will recognize that the various embodiments can be implemented without one or more specific details or with other alternative and / or additional methods, materials or components. In other cases, well-known structures, materials or operations are not shown or described in detail to avoid obscuring the practical points of the present invention. Similarly, for the purpose of explanation, specific quantities, materials and configurations are described in order to provide a comprehensive understanding of the embodiments of the present invention. However, the present invention is not limited to these specific details. In addition, it should be understood that the various embodiments shown in the drawings are illustrative representations and are not necessarily drawn to the correct scale.

[0042] In this specification, reference to "one embodiment" or "the embodiment" means that a particular feature, structure, or characteristic described in conjunction with the embodiment is included in at least one embodiment of the present invention. The phrase "in one embodiment" appearing in various places in this specification does not necessarily refer to the same embodiment.

[0043] Existing energy storage thermal management systems usually do not have a natural cooling module or perform natural cooling by installing a second heat exchanger at the condenser. If a natural cooling module is not installed, the overall power consumption of the unit will be high and the energy efficiency will be low. If a second heat exchanger is used, the coolant circuit interface will be increased, increasing the risk of coolant leakage. Based on this, in order to improve the overall energy efficiency under low-load conditions, the present invention adds a fluorine pump natural cooling module to the energy storage thermal management system. The natural cooling function of the fluorine pump can not only reduce energy consumption under low-load conditions, but also enhance the safety and reliability of system operation and reduce noise. At the same time, an immersion cooling method is adopted for the energy storage battery. When the fluorine pump is in operation, the overall thermal management module has high thermal efficiency.

[0044] The utility model discloses a scheme further described below in conjunction with the accompanying drawings of the embodiments.

[0045] The utility model provides a kind of energy storage system, it includes the immersion energy storage thermal management system of multiple refrigeration circuits, Figure 1 The utility model discloses a structure schematic view of the immersion energy storage thermal management system of multiple refrigeration circuits of one embodiment of the utility model is shown.As shown in Figure 1 The immersion energy storage thermal management system of multiple refrigeration circuits, including first refrigeration module, second refrigeration module, cooling module and control module, wherein first refrigeration module is compressor circuit, and it is sequentially provided with compressor 111, first condenser 112 and throttling element 113 along the flow direction of refrigerant working substance, and second refrigeration module is fluorine pump circuit, and it is sequentially provided with second condenser and fluorine pump 123 along the flow direction of refrigerant working substance, and it is arranged in parallel with first refrigeration module.The cooling module 103 is communicated with first refrigeration module, second refrigeration module, and is used to radiate for the cooling module to be cooled.Control module is used to control the start, the shutdown and the flow of first refrigeration module, second refrigeration module according to heat exchange capacity demand, to reduce the overall energy consumption of system while guaranteeing heat exchange capacity, improve energy efficiency.In one embodiment of the utility model, the first refrigeration module and the second refrigeration module share condenser, i.e. the second condenser is the first condenser 112.

[0046] Figure 2 The utility model discloses a structure schematic view of the compressor circuit of the immersion energy storage thermal management system of one embodiment of the utility model is shown.As shown in Figure 2 The compressor circuit realizes refrigeration cycle by compressor.Cooling medium working substance is first carried out isentropic compression in the compressor 111, then enters the first condenser 112 and carries out isobaric heat release, then enters the throttling element 113 and carries out isenthalpic throttling, and low-temperature cooling medium working substance enters cooling module 103, which can be regarded as carrying out isobaric heat absorption through evaporator. Figure 3 The utility model discloses a pressure enthalpy diagram schematic view of the compressor circuit is shown.

[0047] In one embodiment of the utility model, the compressor 111 can adopt gas float centrifugal compressor, for example.In one embodiment of the utility model, the gas float centrifugal compressor includes motor, impeller, air inlet, exhaust port and connecting pipe.The motor includes rotor system, stator and shell, wherein the rotor system of the motor contains radial gas float bearing, when motor rotating shaft rotates, the radial gas float bearing inhales gas, forms gas film to support the high-speed rotation of rotor, and thrust bearing (if any) also forms gas film, so that thrust rotating shaft and bearing are not in contact, bearing is almost not worn, and mechanical loss and noise can be greatly reduced or even eliminated.

[0048] In an embodiment of the utility model, the throttling element refers to the device or element for reducing gas pressure to achieve the purpose of evaporation, for example, can be: expansion valve, capillary, throttle pipe and the like.

[0049] In an embodiment of the utility model, in order to improve the refrigeration efficiency, first fan 114 is further provided at the fin of condenser 112, first fan 114 introduces normal temperature air into the fin of first condenser 112, so that the heat of high temperature refrigerant working medium inside first condenser 112 exchanges with air, and then the condensation purpose is achieved.

[0050] In order to calculate the system refrigeration demand and then control the working state of each device or module, and protect the system operation, in an embodiment of the utility model, temperature sensor T and pressure sensor P are arranged at the air inlet and / or air outlet of the compressor.

[0051] Figure 4 The structure schematic diagram of the fluorine pump circuit of the immersed energy storage thermal management system of one embodiment of the utility model is shown. Figure 4 As shown in the figure, the fluorine pump circuit mainly realizes the natural cooling function through fluorine pump 123. In an embodiment of the utility model, one-way valve 121 and first electromagnetic valve 122 are further arranged in the fluorine pump circuit, wherein the inlet end of one-way valve 121 is connected to the outlet of the cooling module, the outlet end is connected to the inlet of second condenser 124, first electromagnetic valve 122 is arranged at the inlet of fluorine pump 123, by controlling one-way valve 121 and first electromagnetic valve 122, the fluorine pump circuit can be opened or closed, and the flow of the fluorine pump circuit can be controlled. In the fluorine pump circuit, after the refrigerant working medium is pressurized in fluorine pump 123, it enters cooling module 103, which can be regarded as isobaric heat absorption through the evaporator, then realizes isothermal pressure reduction in the pipeline flow process, and then enters second condenser 124 to carry out isobaric heat generation, and becomes low-pressure low-temperature state again to enter fluorine pump 123. Figure 5 The pressure enthalpy diagram schematic diagram of the fluorine pump circuit of the immersed energy storage thermal management system of one embodiment of the utility model is shown. As can be seen, compared with the compressor circuit, under the same heat exchange capacity and the same evaporation pressure, the latent heat of vaporization Δh in the cooling module in the fluorine pump circuit is larger, and the refrigerant working medium flow is less, the overall power consumption is low, the energy efficiency is high, and the COP is better, so the fluorine pump circuit can be selected under the condition of low ambient temperature, small load and the like. In addition, the fluorine pump circuit has low noise and no cooling liquid leakage risk.

[0052] In addition, as described before, in order to simplify the overall structure of the thermal management system, the fluorine pump circuit can share the condenser with the compressor circuit, that is, second condenser can adopt first condenser 112 in the compressor circuit.

[0053] Back toFigure 1 As shown in Figure 1 one embodiment of the present application, the cooling module adopts immersion cooling. The cooling module 103 comprises a cooling cavity which is in communication with the first and second refrigeration modules. The refrigerant enters the cooling cavity and cools the to-be-cooled module arranged inside the cavity. In one embodiment of the present application, the refrigerant can be fluorinated liquid, and the to-be-cooled module can be a battery cell which is completely immersed in the fluorinated liquid. In one embodiment of the present application, in order to improve the heat exchange efficiency, a certain gap can be reserved between each battery cell, and then the fluorinated liquid can fully exchange heat with each battery cell through the gap.

[0054] In one embodiment of the present application, as shown in Figure 1 the immersion energy storage thermal management system further comprises a dehumidification module. The inlet of the dehumidification module is in communication with the inlet of the cooling module, and the outlet of the dehumidification module is in communication with the outlet of the cooling module, so as to dehumidify and exchange heat of the immersion energy storage thermal management system. As shown in Figure 1 one embodiment of the present application, the dehumidification module comprises a dehumidification heat exchanger 142. In one embodiment of the present application, in order to facilitate the opening and closing of the dehumidification function, the dehumidification module further comprises a second electromagnetic valve 141 arranged at the inlet of the dehumidification heat exchanger 142. When dehumidification is required, the second electromagnetic valve 141 is opened, so that the liquid refrigerant flows into the dehumidification heat exchanger and then returns to the fluorine pump circuit and / or the compressor circuit. In one embodiment of the present application, the dehumidification module further comprises a second fan 143 arranged at the dehumidification heat exchanger 142, so as to introduce normal temperature air into the dehumidification heat exchanger to realize heat exchange.

[0055] Based on the immersion energy storage thermal management system as described above, the present application further provides a thermal management method of an energy storage system, which can determine the refrigeration circuit according to the current ambient temperature and / or the load of the unit. In one embodiment of the present application, a thermal management method of an energy storage system mainly selects a refrigeration module according to the ambient temperature, and the load is used as an auxiliary judgment condition. Specifically, the thermal management method comprises:

[0056] detecting the current ambient temperature, if the ambient temperature is higher than a second preset temperature, the first refrigeration module is opened, and the second refrigeration module is closed, if the ambient temperature is lower than a first preset temperature, the second refrigeration module is opened, and the first refrigeration module is closed, if the ambient temperature is between the first preset temperature and the second preset temperature, the load of the immersion energy storage thermal management system is further determined;

[0057] Next, the load is determined. When the ambient temperature is between the first preset temperature and the second preset temperature, the refrigeration circuit is further determined according to the load. In one embodiment of the present application, the load refers to the ratio of the refrigeration amount required to be output by the submerged energy storage thermal management system to the rated refrigeration amount thereof. If the load is lower than the first preset load, the second refrigeration module is turned on and the first refrigeration module is turned off; if the load is not lower than the second preset load, the first refrigeration module is turned on and the second refrigeration module is turned off; and if the load is between the first preset load and the second preset load, the first refrigeration module and the second refrigeration module are turned on simultaneously.

[0058] It should be understood that, in one embodiment of the present application, the refrigeration circuit can also be determined only according to the ambient temperature, i.e., for example, when the ambient temperature is higher than the second preset temperature, the first refrigeration module is turned on and the second refrigeration module is turned off; when the ambient temperature is lower than the first preset temperature, the first refrigeration module is turned off and the second refrigeration module is turned on; and when the ambient temperature is between the first preset temperature and the second preset temperature, the first refrigeration module and the second refrigeration module are turned on simultaneously.

[0059] It should be understood that, in another embodiment of the present application, the refrigeration circuit can also be determined only according to the load, i.e., for example, when the load is higher than the second preset load, the first refrigeration module is turned on and the second refrigeration module is turned off; when the load is lower than the first preset load, the first refrigeration module is turned off and the second refrigeration module is turned on; and when the load is between the first preset load and the second preset load, the first refrigeration module and the second refrigeration module are turned on simultaneously.

[0060] It should be understood that, in another embodiment of the present application, the refrigeration circuit can also be determined mainly according to the load and secondarily according to the ambient temperature, i.e., for example, when the load is higher than the second preset load, the first refrigeration module is turned on and the second refrigeration module is turned off; when the load is lower than the first preset load, the first refrigeration module is turned off and the second refrigeration module is turned on; and when the load is between the first preset load and the second preset load, the first refrigeration module and / or the second refrigeration module is / are turned on according to the ambient temperature.

[0061] In one embodiment of the present application, the first preset load can be 30%, the second preset load can be 60%, the first preset temperature can be 10°C, and the second preset temperature can be 20°C. It should be understood that, in some other embodiments of the present application, the first and second preset loads and the first and second preset temperatures can also be selected to be different values according to actual requirements.

[0062] In an embodiment of the utility model, still can pass through control throttling element and / or valve's opening, and / or adjust compressor, fluorine pump's power, adjust the flow of submerged energy storage heat management system.

[0063] In an embodiment of the utility model, still can monitor the humidity of system in real time, to control the opening or close of dehumidification module.

[0064] Although the above describes the embodiments of the utility model, should understand, they are presented as example only, and not as limitation. It is obvious for the person skilled in the relevant art that various combinations, variants and changes can be made to it without departing from the spirit and scope of the utility model. Therefore, the width and range of the utility model disclosed here should not be limited by the above disclosed exemplary embodiments, and should be defined only according to the appended claims and their equivalent replacements.

Claims

1. An energy storage system with an immersion thermal management module and dehumidification function, characterized in that: The immersion energy storage thermal management module includes: A first refrigeration module is provided with a compressor, a first condenser and a throttling element in sequence along the refrigerant flow direction; A second refrigeration module is arranged in parallel with the first refrigeration module and is provided with a second condenser and a fluorine pump in sequence along the refrigerant flow direction; A cooling module, comprising a cooling cavity, wherein the cooling cavity is in communication with the first refrigeration module and the second refrigeration module, and a refrigerant enters the cooling cavity to cool the module to be cooled disposed inside the cavity; and The dehumidification module has an inlet communicated with the inlet of the cooling module and an outlet communicated with the outlet of the cooling module.

2. The energy storage system according to claim 1, wherein: The first refrigeration module and the second refrigeration module share a condenser.

3. The energy storage system according to claim 1, wherein: The second refrigeration module further includes: a one-way valve, an inlet end of which is connected to the outlet of the cooling module, and an outlet end of which is connected to the inlet of the second condenser; and A first electromagnetic valve is provided at the inlet of the fluorine pump.

4. The energy storage system according to claim 1, wherein: The submerged energy storage thermal management module further includes a first fan, which is disposed at the first condenser and / or the second condenser to introduce room temperature air into the first and second condensers to achieve heat exchange.

5. The energy storage system according to claim 1, wherein: The dehumidification module includes a dehumidification heat exchanger.

6. The energy storage system according to claim 5, characterized in that The dehumidification module further includes: A second solenoid valve is provided at the inlet of the dehumidification heat exchanger.

7. The energy storage system according to claim 5, characterized in that The dehumidification module further includes: The second fan is arranged at the dehumidification heat exchanger to introduce air at normal temperature into the dehumidification heat exchanger to realize heat exchange.

8. The energy storage system according to claim 1, wherein: The submerged energy storage thermal management module further includes a control module configured to control the activation, deactivation, and flow of the first refrigeration module, the second refrigeration module, and the dehumidification module according to heat exchange requirements.

9. The energy storage system according to claim 1, wherein: The submerged energy storage thermal management module further includes at least one temperature sensor and at least one pressure sensor, wherein the temperature sensor and the pressure sensor are arranged at the air inlet and / or the exhaust port of the compressor.

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