Energy storage liquid cooling system

Abstract

The invention discloses an energy storage liquid cooling system, which comprises a box body on which a PCS liquid outlet, a PCS liquid return port, a battery cluster liquid outlet and a battery cluster liquid return port are formed; the PCS temperature control assembly comprises an air cooler, one end of the air cooler is connected with the PCS liquid outlet, and the other end of the air cooler is connected with the PCS liquid return opening; one end of the battery cluster temperature control assembly is connected with the battery cluster liquid outlet, and the other end of the battery cluster temperature control assembly is connected with the battery cluster liquid return opening; a refrigeration assembly; the cold receiving end of the heat exchanger is communicated with the battery cluster temperature control assembly; the cold supply end of the heat exchanger communicates with the refrigeration assembly. The refrigeration assembly is configured to refrigerate the battery cluster temperature control assembly. The PCS temperature control assembly and the battery cluster temperature control assembly are cooled and refrigerated through the air cooler and the refrigeration assembly respectively, independent cooling is achieved, cooling liquid of different temperature zones can be provided for the battery cluster and the PCS respectively, the optimal working temperature of the battery cluster and the PCS can be achieved, interference is avoided, the configuration requirement for the refrigeration assembly is reduced, and cost can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage temperature control, and in particular to an energy storage liquid cooling system. Background Art

[0002] Energy storage is the process of storing energy through a medium or device and releasing it when needed. It is a technology for balancing supply and demand in the power grid. According to the energy storage method, energy storage can be divided into mechanical energy storage, electromagnetic energy storage, electrochemical energy storage, thermal energy storage, hydrogen energy storage and other types. The electrochemical energy storage system is mainly composed of battery packs, battery management systems, energy management systems, power storage inverters (PCS) and other electrical equipment. The battery packs and energy storage inverters of the energy storage system have high power consumption and large heat dissipation. Temperature control of battery packs and energy storage inverters is a key link to ensure their normal operation. Traditional air cooling can no longer meet the heat dissipation needs of energy storage systems with increasingly larger capacities.

[0003] The existing Chinese patent application with publication number CN117712557A discloses a temperature control device and method for an energy storage system, including a first flow path, a second flow path and a refrigerant circulation loop; the refrigerant circulation loop includes a first heat exchanger, and the first flow path is connected to the first heat exchanger; the second flow path is provided with a dry cooler, a second heat exchanger and a valve body structure in sequence; the outlet of the dry cooler is connected to a first branch and a second branch, and the valve body structure can control the opening and closing of the first branch and the second branch; the first branch and the first flow path are respectively connected to the second heat exchanger.

[0004] When the ambient temperature is high, the PCS heat dissipation of the temperature control device of the energy storage system cannot meet the demand, and the battery cluster needs to be used for forced heat dissipation to cool the PCS circuit. The configuration of the compressor and condenser needs to be improved to meet the heat dissipation demand, which leads to higher production costs. Summary of the invention

[0005] In response to the problems pointed out in the background technology, some embodiments provide an energy storage liquid cooling system to solve the problems existing in the prior art, such as the PCS heat dissipation cannot meet the demand at high ambient temperature, and the battery cluster forced heat dissipation is needed to cool the PCS circuit, and the configuration of the compressor and condenser needs to be improved to meet the heat dissipation demand, resulting in high production costs.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions: In some embodiments, an energy storage liquid cooling system is provided, comprising: A box body, on which a PCS liquid outlet, a PCS liquid return port, a battery cluster liquid outlet and a battery cluster liquid return port are formed; A PCS temperature control component is arranged in the box, and comprises an air cooler, one end of the air cooler is connected to the PCS liquid outlet, and the other end of the air cooler is connected to the PCS liquid return port; A battery cluster temperature control component, which is arranged in the box, one end of which is connected to the battery cluster liquid outlet, and the other end of which is connected to the battery cluster liquid return port; A refrigeration component, which is arranged in the box; A heat exchanger, wherein the cold end of the heat exchanger is connected to the battery cluster temperature control component; and the cold supply end of the heat exchanger is connected to the refrigeration component; The air cooler is stacked above the refrigeration assembly, and the refrigeration assembly is configured to cool the battery cluster temperature control assembly.

[0007] In some embodiments of the present application, the battery cluster temperature control component includes: First expansion tank; First circulation pump; The battery cluster liquid return port, the first expansion tank, the first circulation pump, the cold end of the heat exchanger and the battery cluster liquid outlet are sequentially connected to form a battery cluster temperature control flow path.

[0008] In some embodiments of the present application, the battery cluster temperature control component further includes: The first electric heater is disposed on the battery cluster temperature control flow path and is configured to be electrically powered to heat the coolant in the battery cluster temperature control flow path.

[0009] In some embodiments of the present application, the refrigeration assembly includes: compressor; A condenser, which is stacked above the air cooler; Electronic expansion valve; The compressor, the condenser, the electronic expansion valve and the cooling end of the heat exchanger are sequentially connected to form a refrigerant circulation path.

[0010] In some embodiments of the present application, the PCS temperature control component further includes: Second circulation pump; Second expansion tank; A temperature control branch, wherein the air cooler is arranged on the temperature control branch; The PCS liquid outlet, the temperature control branch, the second circulation pump, the second expansion tank and the PCS liquid return port are sequentially connected to form a PCS temperature control flow path.

[0011] In some embodiments of the present application, the PCS temperature control component further includes: The second electric heater is arranged on the PCS temperature control flow path and located between the PCS liquid outlet and the temperature control branch, and is configured to be electrically powered to heat the coolant in the PCS temperature control flow path.

[0012] In some embodiments of the present application, the temperature control branch includes: a first bypass branch, the air cooler being arranged on the first bypass branch; The second bypass branch is connected in parallel with the first bypass branch and is connected between the second electric heater and the second circulation pump.

[0013] In some embodiments of the present application, the PCS temperature control component further includes: An electrically controlled valve is provided on the first bypass branch and / or the second bypass branch and is configured to adjust the opening of the first bypass branch and the second bypass branch.

[0014] In some embodiments of the present application, the energy storage liquid cooling system further includes: A liquid replenishing tank, which is arranged in the box body, and the liquid outlet end of the liquid replenishing tank is respectively connected with the PCS temperature control flow path through the second branch and is connected with the battery cluster temperature control flow path through the first branch; A battery cluster pressure relief valve, which is arranged in the battery cluster temperature control flow path and is connected to the liquid inlet end of the liquid replenishing tank through a third branch; A PCS pressure relief valve, which is arranged on the PCS temperature control flow path and is connected to the return liquid end of the liquid replenishing tank through a fourth branch; A battery cluster refilling pump, which is arranged on the first branch; A PCS fluid replenishing pump is arranged on the second branch.

[0015] In some embodiments, an energy storage liquid cooling system is provided, comprising: A box body, on which a PCS liquid outlet, a PCS liquid return port, a battery cluster liquid outlet and a battery cluster liquid return port are formed; A PCS temperature control component is arranged in the box, and comprises an air cooler, one end of the air cooler is connected to the PCS liquid outlet, and the other end of the air cooler is connected to the PCS liquid return port; A battery cluster temperature control component, which is arranged in the box, one end of which is connected to the battery cluster liquid outlet, and the other end of which is connected to the battery cluster liquid return port; A refrigeration component, which is arranged in the box; A heat exchanger is arranged in the box, wherein the cold end of the heat exchanger is connected to the battery cluster temperature control component; and the cold supply end of the heat exchanger is connected to the refrigeration component; The PCS temperature control component is cooled by the air cooler, the air cooler is stacked on top of the cooling component, and the cooling component and the battery cluster temperature control component perform heat exchange with each other through the heat exchanger to cool the battery cluster temperature control component.

[0016] The above-mentioned embodiment has the following advantages or beneficial effects: the PCS temperature control component is cooled by an air cooler, the battery cluster temperature control component is cooled by a refrigeration component, the PCS temperature control component and the battery cluster temperature control component are cooled independently, and under high ambient temperature, the PCS temperature control component completely utilizes the air cooler to dissipate heat, which will not affect the heat exchange effect between the battery cluster temperature control component and the refrigeration component, ensuring that the PCS side always uses the air cooler for natural convection cooling, and the air cooler is stacked on top of the refrigeration component, and there is no influence on the heat dissipation of each other, and the heat exchange efficiency is high; the present application can provide coolants in different temperature zones for the battery cluster and the PCS respectively, to achieve their respective optimal operating temperatures, avoid mutual interference, reduce the configuration requirements for the refrigeration component, and help reduce costs.

[0017] At the same time, the PCS temperature control components, battery cluster temperature control components, refrigeration components and heat exchangers are integrated in the box, with high integration and small space occupation, which is more suitable for increasingly integrated energy storage systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1 One of the structural schematic diagrams of an embodiment of the energy storage liquid cooling system provided by the present invention; Figure 2 This is one of the structural schematic diagrams of an embodiment of a battery cluster temperature control component provided by the present invention; Figure 3 The second structural schematic diagram of an embodiment of a battery cluster temperature control assembly provided by the present invention; Figure 4 One of the structural schematic diagrams of an embodiment of a PCS temperature control component provided by the present invention; Figure 5 The second structural schematic diagram of an embodiment of a PCS temperature control component provided by the present invention; Figure 6 The third structural schematic diagram of an embodiment of a PCS temperature control component provided by the present invention; Figure 7 A second structural schematic diagram of an embodiment of an energy storage liquid cooling system provided by the present invention; Figure 8 The third structural schematic diagram of an embodiment of the energy storage liquid cooling system provided by the present invention; Fig. 9 A fourth structural schematic diagram of an embodiment of an energy storage liquid cooling system provided by the present invention; Fig.10 One of the structural schematic diagrams of another embodiment of the energy storage liquid cooling system provided by the present invention; Fig.11 The second structural schematic diagram of another embodiment of the energy storage liquid cooling system provided by the present invention.

[0020] Reference numerals: 1. Box body; 11. PCS liquid outlet; 111. Second liquid outlet temperature sensor; 112. Second liquid outlet pressure sensor; 12. PCS liquid return port; 121. Second liquid inlet temperature sensor; 122. Second liquid inlet pressure sensor; 13. Battery cluster liquid outlet; 131. First liquid outlet temperature sensor; 132. First liquid outlet pressure sensor; 14. Battery cluster liquid return port; 141. First liquid inlet temperature sensor; 142. First liquid inlet pressure sensor; 2. PCS temperature control assembly; 20. PCS pressure relief valve; 21. Air cooler; 22. Second circulation pump; 23. Second expansion tank; 24. Second electric heater; 25. First bypass branch; 26. Second bypass branch; 27. Electric three-way valve; 28. Electric two-way valve; 29. ​​Solenoid valve; 3. Battery cluster temperature control assembly; 31. First expansion tank; 32. First circulation pump; 33. First electric heater; 34. Battery cluster pressure relief valve; 4. Refrigeration components; 41. Compressor; 42. Condenser; 43. Electronic expansion valve; 5. Heat exchanger; 6. Fluid replenishing tank; 61. Second branch; 611. PCS fluid replenishing pump; 62. First branch; 621. Battery cluster fluid replenishing pump; 63. Third branch; 64. Fourth branch. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0022] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying 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 specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0023] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0024] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0025] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0026] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0027] A complete electrochemical energy storage system is mainly composed of battery packs, battery management systems (BMS), energy management systems (EMS), power storage converters (PCS) and other electrical equipment.

[0028] The battery management system (BMS) is mainly responsible for battery monitoring, evaluation, protection and balancing. It is the brain of the energy storage system. As a link between the battery cell and the energy storage system / energy storage power station, it can realize intelligent management and maintenance of each battery unit. It is mainly responsible for battery health detection, evaluation and protection, ensuring that the battery cell operates in a safer and more comfortable environment, and realizing dynamic maintenance of battery consistency and precise control of ambient temperature.

[0029] The energy storage converter PCS, also known as the bidirectional energy storage inverter, is the core component that realizes the bidirectional flow of electric energy between the energy storage system and the power grid. It is used to control the charging and discharging process of the battery and perform AC / DC conversion.

[0030] The energy management system (EMS) is responsible for monitoring and controlling the energy flow within the battery storage system and coordinating the work of the BMS, PCS and other components.

[0031] A battery cluster is usually composed of battery modules, battery packs and battery management systems. The battery module is the basic unit of the battery cluster, which contains multiple battery cells and provides connection and protection functions for the battery cells. The battery pack is composed of multiple battery modules connected in series or in parallel, which provides the overall voltage and capacity of the battery cluster.

[0032] In some embodiments, in combination Figures 1 to 11 As shown, an energy storage liquid cooling system is provided, which includes a box body 1, a PCS temperature control component 2, a battery cluster temperature control component 3, a refrigeration component 4 and a heat exchanger 5.

[0033] Combination Fig.11 As shown, a PCS liquid outlet 11 , a PCS liquid return port 12 , a battery cluster liquid outlet 13 and a battery cluster liquid return port 14 are formed on the box body 1 .

[0034] The PCS temperature control component 2 is arranged in the box body 1. The PCS temperature control component 2 includes an air cooler 21. The air cooler 21 is also called an air cooler. It is a device that uses ambient air as a cooling medium to cool or condense the fluid in the pipe.

[0035] Combination Figure 1 As shown, one end of the air cooler 21 is connected to the PCS liquid outlet 11 , and the other end of the air cooler 21 is connected to the PCS liquid return port 12 .

[0036] The battery cluster temperature control component 3 is disposed in the box body 1 , one end of the battery cluster temperature control component 3 is connected to the battery cluster liquid outlet 13 , and the other end of the battery cluster temperature control component 3 is connected to the battery cluster liquid return port 14 .

[0037] The refrigeration assembly 4 is arranged in the box body 1 .

[0038] The cold end of the heat exchanger 5 is connected to the battery cluster temperature control component 3; the cold supply end of the heat exchanger 5 is connected to the refrigeration component 4; the heat exchanger 5 can be a plate heat exchanger 5. Of course, the type of the heat exchanger 5 includes but is not limited to the plate heat exchanger 5. For example, it can also be other types such as a tubular heat exchanger 5, which is not limited here.

[0039] The air cooler 21 is stacked above the refrigeration assembly 4 , and the refrigeration assembly 4 is configured to cool the battery cluster temperature control assembly 3 .

[0040] In some embodiments of the present application, the PCS temperature control component 2 is cooled by the air cooler 21, and the battery cluster temperature control component 3 is cooled by the refrigeration component 4. The PCS temperature control component 2 and the battery cluster temperature control component 3 are cooled independently. Under high ambient temperature, the PCS temperature control component 2 completely utilizes the air cooler 21 to dissipate heat, which will not affect the heat exchange effect between the battery cluster temperature control component 3 and the refrigeration component 4, ensuring that the PCS side always uses the air cooler 21 for natural convection cooling, and the heat exchange efficiency is high.

[0041] The present application can provide coolants in different temperature zones for the battery cluster and the PCS respectively, so as to achieve their respective optimal operating temperatures, avoid mutual interference, reduce the configuration requirements for the refrigeration component 4, and help reduce costs.

[0042] At the same time, the PCS temperature control component 2, the battery cluster temperature control component 3, the refrigeration component 4 and the heat exchanger 5 are integrated in the box 1, which has a high degree of integration and occupies a small space, and is more suitable for an increasingly integrated energy storage system.

[0043] Combination Figure 2 and Figure 3 As shown, in some embodiments of the present application, the battery cluster temperature control assembly 3 includes a first expansion tank 31 and a first circulation pump 32 .

[0044] The battery cluster liquid return port 14, the first expansion tank 31, the first circulation pump 32, the cold end of the heat exchanger 5 and the battery cluster liquid outlet 13 are sequentially connected to form a battery cluster temperature control flow path.

[0045] In some embodiments of the present application, in actual pipeline connection, the first expansion tank 31 is connected to the battery cluster temperature control flow path through the pipeline, and the inlet of the first expansion tank 31 is connected to the inlet of the first circulation pump 32. This is because the pressure at the inlet of the first circulation pump 32 is the lowest.

[0046] The working principle of the first expansion tank 31 is as follows: when the temperature of the coolant in the temperature control flow path of the battery cluster increases, the coolant expands due to the principle of thermal expansion and contraction, and the excess coolant due to expansion can enter the first expansion tank 31 for temporary storage; when the temperature of the coolant in the temperature control flow path of the battery cluster drops, the volume decreases, and the coolant in the first expansion tank 31 flows back into the temperature control flow path of the battery cluster, thereby ensuring that the coolant in the temperature control flow path of the battery cluster is maintained within the normal operating range.

[0047] The first circulation pump 32 is used to transport the coolant in the temperature control flow path of the battery cluster. As a heavy component, the first circulation pump 32 is fixed to the bottom bracket of the box body 1 by screws or bolts.

[0048] In some embodiments of the present application, the first circulation pump 32 has a frequency conversion function and can adjust the size of the delivered water flow according to the cooling demand of the battery cluster.

[0049] In some embodiments of the present application, the battery cluster temperature control assembly 3 further includes a first electric heater 33 .

[0050] The first electric heater 33 is disposed on the battery cluster temperature control flow path, and is configured to be powered on to heat the brine in the battery cluster temperature control flow path.

[0051] In some embodiments of the present application, the operating temperature range of the battery cluster is about 20°C. When the external ambient temperature is low, for example, in the initial stage of charging and discharging of the battery cluster, the battery cells of the battery cluster need to be heated to the operating temperature range, and the battery cluster temperature control flow path enters the heating mode.

[0052] At this time, the refrigeration component 4 is not working, the first circulation pump 32 is turned on, the first electric heater is turned on, the coolant in the battery cluster temperature control flow path is heated, and the heated coolant is sent to the battery cluster to heat the battery cells. After reaching the operating temperature range, the battery cluster temperature control flow path enters the cooling mode according to the control of the energy storage system BMS.

[0053] In some embodiments of the present application, the refrigeration assembly 4 includes a compressor 41 , a condenser 42 , an electronic expansion valve 43 and a heat exchanger 5 .

[0054] Combination Fig.11 As shown, the condenser 42 is stacked on the air cooler 21, so that the air cooler 21 and the condenser 42 are placed separately, each is equipped with an independent heat dissipation fan, and will not affect the heat dissipation effect of each other.

[0055] The compressor 41, the condenser 42, the electronic expansion valve 43 and the cooling end of the heat exchanger 5 are sequentially connected to form a refrigerant circulation path.

[0056] The cooling process of the battery cluster cold plate is as follows: when the battery cluster is discharged, the heat released by the battery cluster is absorbed by the battery cluster cold plate. A cooling channel is provided in the battery cluster cold plate. The cooling channel is respectively connected to the battery cluster liquid return port 14 and the battery cluster liquid outlet port 13. The battery cluster temperature control flow path enters the cooling mode.

[0057] In the refrigeration assembly 4, the compressor 41 sucks in the refrigerant gas and discharges the high-temperature and high-pressure refrigerant gas, which is throttled by the electronic expansion valve 43 and evaporates and exchanges heat with the high-temperature refrigerant in the cold-supply end and the cold-receiving end of the plate heat exchanger 5. After the refrigerant absorbs heat, it returns to the compressor 41 for re-gasification. In the battery cluster temperature control flow path, the high-temperature refrigerant returns from the battery cluster cold plate to the battery cluster temperature control flow path, is sent to the cold-receiving end of the plate heat exchanger 5 by the first circulation pump 32 for cooling, and then is sent to the battery cluster cold plate.

[0058] When the battery cluster temperature control flow path reaches the set temperature in cooling or heating mode, it stops and enters the self-circulation mode. In the self-circulation mode, the refrigeration component 4 does not operate, the compressor 41 stops, and only the first circulation pump 32 enters low-frequency operation to reduce energy consumption. When the outlet liquid temperature rises to meet the cooling start-up mode or the temperature drops to meet the heating start-up mode, it will enter the cooling or heating mode.

[0059] Combination Figure 4 , Figure 5 and Figure 6 As shown, in some embodiments of the present application, the PCS temperature control assembly 2 further includes a second circulation pump 22, a second expansion tank 23 and a temperature control branch.

[0060] The air cooler 21 is arranged on the temperature control branch.

[0061] The PCS liquid outlet 11, the temperature control branch, the second circulation pump 22, the second expansion tank 23 and the PCS liquid return port 12 are sequentially connected to form a PCS temperature control flow path.

[0062] In some embodiments of the present application, the PCS temperature control assembly 2 further includes a second electric heater 24 .

[0063] The second electric heater 24 is disposed on the PCS temperature control flow path and is located between the PCS liquid outlet 11 and the temperature control branch, and is configured to be powered on to heat the coolant in the PCS temperature control flow path.

[0064] In some embodiments of the present application, by setting a second electric heater 24, when the temperature of the PCS is too low, the second electric heater 24 is turned on to heat the refrigerant in the PCS temperature control flow path, and the refrigerant is sent into the energy storage system pipeline and into the PCS to heat the PCS, thereby facilitating the control of the temperature of the PCS.

[0065] In some embodiments of the present application, the temperature control branch includes a first bypass branch 25 and a second bypass branch 26 , and the air cooler 21 is disposed on the first bypass branch 25 .

[0066] The second bypass branch 26 is connected in parallel with the first bypass branch 25 , and is connected between the second electric heater 24 and the second circulation pump 22 .

[0067] In some embodiments of the present application, the PCS temperature control assembly 2 also includes an electrically controlled valve.

[0068] The electric control valve is disposed on the first bypass branch 25 and / or the second bypass branch 26 , and is configured to adjust the opening of the first bypass branch 25 and the second bypass branch 26 .

[0069] Combination Fig.10 As shown, in some embodiments of the present application, the electric control valve includes a solenoid valve 29 and an electric two-way valve 28, the solenoid valve 29 is arranged on the second bypass branch 26, and the electric two-way valve 28 is arranged on the first bypass branch 25, wherein the electric two-way valve 28 is used to adjust the opening degree of the refrigerant in the first bypass branch 25, and the solenoid valve 29 is used to control the on-off of the second bypass branch 26.

[0070] Combination Figure 1 As shown, in some embodiments of the present application, the electric control valve includes an electric three-way valve 27, the inlet end of the electric three-way valve 27 is connected to the outlet end of the second circulation pump 22, one outlet end of the electric three-way valve 27 is connected to the first bypass branch 25, and the other outlet end of the electric three-way valve 27 is connected to the second bypass branch 26. The electric three-way valve 27 is used to adjust the flow rate of the refrigerant flowing into the first bypass branch 25 and the second bypass branch 26.

[0071] It should be noted that the sum of the total flow rates flowing into the first bypass branch 25 and the total flow rates flowing into the second bypass branch 26 is equal to the flow rate flowing into the inlet end of the electric three-way valve 27 .

[0072] The process of cooling the PCS by the PCS temperature control flow path is as follows: Figure 4 As shown, when the temperature of the PCS is too high, the electric three-way valve 27 is connected to the first bypass branch 25, and the second circulation pump 22 sends the coolant into the air cooler 21 through the electric three-way valve 27, so that the high-temperature coolant exchanges heat with the air, and then the coolant is sent to the PCS to cool the PCS.

[0073] Combination Figure 5 As shown, when the temperature of the PCS is too low, the electric three-way valve 27 is connected to the second bypass branch 26, and the refrigerant no longer enters the air cooler 21 for cooling. Instead, it is determined based on the temperature whether to turn on the second electric heater 24 to heat the refrigerant.

[0074] Combination Figure 6 As shown, when the PCS temperature is within a certain range, the electric three-way valve 27 connects the first bypass branch 25 and the second bypass branch 26, a part of the refrigerant flows into the first bypass branch 25 and enters the air cooler 21, and the other part of the refrigerant flows into the second bypass branch 26. The cooling fan of the air cooler 21 is maintained at a relatively low speed, which can provide a relatively low cooling capacity to keep the PCS temperature working in a high-efficiency range. Exemplarily, the opening of the electric three-way valve 27 toward the first bypass branch 25 and the second bypass branch 26 is 50%.

[0075] The PCS temperature control flow path stops when the set temperature is reached in the cooling or heating mode and enters the self-circulation mode. The heat dissipation fan of the air cooler 21 stops, and the electric three-way valve 27 maintains the action before shutdown. The second circulation pump 22 enters low-frequency operation to reduce energy consumption. When the outlet liquid temperature rises due to the change of PCS temperature and meets the cooling start-up conditions or the temperature drops to meet the heating start-up conditions, the electric three-way valve 27 is controlled according to the current temperature to whether to connect to the first bypass branch 25 to enter the cooling mode, or to connect to the second bypass branch 26 to enter the heating mode.

[0076] In some embodiments of the present application, Figure 7 , Figure 8 and Fig. 9 As shown, the energy storage liquid cooling system also includes a liquid replenishing tank 6, a PCS pressure relief valve 20, a battery cluster pressure relief valve 34, a PCS liquid replenishing pump 611, a battery cluster liquid replenishing pump 621, a first liquid inlet temperature sensor 141, a first liquid outlet temperature sensor 131, a first liquid inlet pressure sensor 142, a first liquid outlet pressure sensor 132, a second liquid inlet temperature sensor 121, a second liquid outlet temperature sensor 111, a second liquid inlet pressure sensor 122, and a second liquid outlet pressure sensor 112.

[0077] The liquid replenishing tank 6 is arranged in the box body 1 , and the liquid outlet end of the liquid replenishing tank 6 is connected to the PCS temperature control flow path through the second branch 61 and is connected to the battery cluster temperature control flow path through the first branch 62 .

[0078] The PCS pressure relief valve 20 is arranged on the PCS temperature control flow path, and is connected to the liquid return end of the liquid replenishing tank 6 through the fourth branch 64 .

[0079] The battery cluster pressure relief valve 34 is arranged in the battery cluster temperature control flow path, and is connected to the liquid inlet end of the liquid replenishing tank 6 through the third branch 63 .

[0080] The battery cluster liquid replenishing pump 621 is disposed on the first branch 62 .

[0081] The PCS fluid replenishing pump 611 is disposed on the second branch 61 .

[0082] The first liquid inlet temperature sensor 141, the first liquid outlet temperature sensor 131, the first liquid inlet pressure sensor 142, and the first liquid outlet pressure sensor 132 are arranged on the battery cluster temperature control flow path; the second liquid inlet temperature sensor 121, the second liquid outlet temperature sensor 111, the second liquid inlet pressure sensor 122, and the second liquid outlet pressure sensor 112 are arranged on the PCS temperature control flow path.

[0083] In some embodiments of the present application, after long-term operation, the temperature control flow path of the battery cluster may have problems such as leakage and high-pressure drainage, and the coolant may be reduced. The first liquid inlet pressure sensor 142 and the first liquid outlet pressure sensor 132 can be used to determine whether the temperature control flow path of the battery cluster lacks coolant.

[0084] Combination Figure 7 As shown, the missing coolant can be delivered from the refill tank 6 to the battery cluster temperature control flow path through the battery cluster refill pump 621. In order to prevent the coolant from flowing back, a first one-way valve is provided on the first branch 62, which can effectively prevent the coolant from flowing back into the refill tank 6 after the battery cluster refill pump 621 stops.

[0085] At the same time, when the pressure of the battery cluster temperature control flow path is too high, the coolant is discharged into the liquid replenishment tank 6 through the battery cluster pressure relief valve 34 to avoid waste caused by direct discharge of the coolant.

[0086] After long-term operation, the PCS temperature control flow path may have problems such as leakage and high-pressure drainage, and the refrigerant will be reduced. The second liquid inlet pressure sensor 122 and the second liquid outlet pressure sensor 112 can be used to determine whether the PCS temperature control flow path lacks refrigerant.

[0087] Combination Figure 8 As shown, the missing refrigerant can be delivered into the PCS temperature control flow path from the refrigerant tank 6 through the PCS refrigerant pump 611. In order to prevent the refrigerant from flowing back, a second one-way valve is provided on the second branch 61. The second one-way valve can effectively prevent the refrigerant from flowing back into the refrigerant tank 6 after the PCS refrigerant pump 611 stops.

[0088] At the same time, combined Fig. 9 As shown, when the pressure of the PCS temperature control flow path is too high, the coolant is discharged into the liquid replenishment tank 6 through the PCS pressure relief valve 20 to avoid waste caused by direct discharge of the coolant.

[0089] The PCS temperature control flow path and the battery cluster temperature control flow path share the refill tank 6, but are controlled by two refill pumps and two one-way valves respectively, and do not interfere with each other.

[0090] In some embodiments, an energy storage liquid cooling system is provided, which includes a box 1, a PCS temperature control component 2, a battery cluster temperature control component 3, a refrigeration component 4 and a heat exchanger 5.

[0091] The box body 1 is formed with a PCS liquid outlet 11 , a PCS liquid return port 12 , a battery cluster liquid outlet 13 and a battery cluster liquid return port 14 .

[0092] The PCS temperature control assembly 2 is disposed in the box body 1 , and includes an air cooler 21 . One end of the air cooler 21 is connected to the PCS liquid outlet 11 , and the other end of the air cooler 21 is connected to the PCS liquid return port 12 .

[0093] The battery cluster temperature control assembly 3 is disposed in the box body 1 , one end of which is connected to the battery cluster liquid outlet 13 , and the other end of which is connected to the battery cluster liquid return port 14 .

[0094] The refrigeration assembly 4 is arranged in the box body 1 .

[0095] The heat exchanger 5 is arranged in the box body 1 , and the cold end of the heat exchanger 5 is connected to the battery cluster temperature control component 3 ; the cold supply end of the heat exchanger 5 is connected to the refrigeration component 4 .

[0096] The PCS temperature control component 2 is cooled by the air cooler 21 , and the cooling component 4 and the battery cluster temperature control component 3 perform heat exchange through the heat exchanger 5 to cool the battery cluster temperature control component 3 .

[0097] In this application, the control logic of the battery cluster temperature control flow path is as follows: the energy storage system BMS sends a cooling mode request, combined with Figure 2 As shown, the flow direction of the coolant in the battery cluster temperature control component 3 and the flow direction of the refrigerant in the refrigeration component 4 are as indicated by the arrows, the first circulation pump 32 is started, and when the first liquid outlet temperature Tow_b detected by the first liquid outlet temperature sensor 131 is greater than Tset_b+A, where Tset_b is the set temperature of the battery cluster, the first liquid outlet temperature is too high, and the refrigerant circulation flow path starts the refrigeration mode for refrigeration.

[0098] When Tow_b≤Tset_b-B, the refrigerant circulation flow path stops and enters the self-circulation mode, and the first circulation pump 32 enters the low-frequency mode; during the operation in the self-circulation mode, when Tow_b>Tset_b+A is satisfied, the first circulation pump 32 resumes high-frequency operation and the refrigerant circulation flow path starts cooling.

[0099] The energy storage system BMS sends a heating mode request and starts the first circulation pump 32. When Tow_b<Tset_b-C, the first liquid outlet temperature is too low, and the first electric heater 33 is started to heat the refrigerant; when Tow_b≥Tset_b-D, the first electric heater 33 is turned off and enters the self-circulation mode, and the first circulation pump 32 enters the low-frequency mode; when the self-circulation mode is operating and Tow_b>Tset_b-C is satisfied again, the first circulation pump 32 resumes high-frequency operation, and the first electric heater 33 starts to heat the refrigerant.

[0100] Note: Parameters A>0, B≥0, C>0, and D≥0 are different startup and shutdown hysteresis defined for different energy storage systems according to different heat dissipation requirements of the battery cluster cold plate. The parameters can be adjusted according to different systems.

[0101] In the present application, the control logic of the PCS temperature control flow path is as follows: when the ambient temperature Tair_p is higher than the lower limit of the PCS allowable operating temperature Tair_pd, the PCS dissipates heat, and the PCS liquid cooling system only enters the cooling mode and the self-circulation mode. When the second liquid outlet temperature Tow_p detected by the second liquid outlet temperature sensor 111 is greater than Tset_p+X, where Tset_p is the set temperature of the PCS, Tow_p is too high, the second circulation pump 22 operates at a high frequency, the electric three-way valve 27 connects to the first bypass branch 25, the heat dissipation fan of the air cooler 21 starts, and the air cooler 21 cools the coolant; when Tow_p≤Tset_p-Y, the heat dissipation fan of the air cooler 21 stops, and enters the self-circulation mode, the flow direction of the electric three-way valve 27 remains unchanged, and the second circulation pump 22 enters low-frequency operation; when the self-circulation mode is in operation, if Tow_p>Tset_p+X is satisfied again, the second circulation pump 22 resumes high-frequency operation, and the heat dissipation fan of the air cooler 21 starts cooling.

[0102] When Tair_p is within the normal temperature range, Tair_pd<Tair_p<Tset_p. When Tow_p≤Tset_p+X, it is in self-circulation mode, the second circulation pump 22 starts and runs at a low frequency, and the electric three-way valve 27 connects the second bypass branch 26. When Tow_p>Tset_p+X, the second liquid outlet temperature is too high, the second circulation pump 22 runs at a high frequency, the electric three-way valve 27 connects the second bypass branch 26 and the first bypass branch 25 at the same time, the heat dissipation fan of the air cooler 21 starts, the air cooler 21 cools the coolant, and the cooled coolant is mixed with the coolant flowing out of the second bypass branch 26 and sent to the PCS to cool the PCS; when Tow_p≤Tset_p-Y, the heat dissipation fan of the air cooler 21 stops, enters the self-circulation mode, the opening of the electric three-way valve 27 remains unchanged, and the second circulation pump 22 enters low-frequency operation.

[0103] When Tair_p<Tair_pd, the temperature is too low when the PCS starts, and the Tair_pd temperature value is used as the target adjustment temperature in this range. When Tow_p<Tair_pd, the second circulation pump 22 operates at a high frequency, the electric three-way valve 27 connects to the second bypass branch 26, and the second electric heater 24 is turned on to heat the coolant; when Tow_p≥Tair_pd+Y, the second electric heater 24 stops, and the second circulation pump 22 turns to a low frequency operation and enters the self-circulation mode. When Tow_p>Tset_p+X, the second outlet temperature is too high, the second circulation pump 22 operates at a high frequency, the electric three-way valve 27 connects the second bypass branch 26 and the first bypass branch 25 at the same time, the cooling fan of the air cooler 21 operates at a low speed, and the cooled refrigerant is mixed with the refrigerant from the first bypass branch 25 and sent to the PCS to cool the PCS; when Tow_p≤Tset_p-Y, the second outlet temperature reaches the shutdown condition, the cooling fan of the air cooler 21 stops, enters the self-circulation mode, the opening of the electric three-way valve 27 remains unchanged, and the second circulation pump 22 enters low-frequency operation. That is, when Tair_pd+Y≤Tow_p≤Tset_p-Y, it enters the self-circulation mode.

[0104] Note: Parameters U>0, V≥0, X>0, Y≥0 are different startup and shutdown hysteresis defined for different energy storage systems according to different cooling requirements of battery cluster cold plates. The parameters can be adjusted according to different systems.

[0105] The control logic of the liquid replenishment system is as follows: when the outlet pressure of the battery cluster temperature control flow path Pow_b<P_down, where P_down is the lower limit of the outlet pressure; the battery cluster liquid replenishment pump 621 is turned on to inject the coolant in the liquid replenishment tank 6 into the battery cluster temperature control flow path; when Pow_b≥P_down, the battery cluster liquid replenishment pump 621 is stopped; When the liquid inlet pressure Piw_b of the battery cluster temperature control flow path is less than P_down, the battery cluster liquid replenishing pump 621 is turned on to inject the coolant in the liquid replenishing tank 6 into the battery cluster temperature control flow path; when Piw_b≥P_down, the battery cluster liquid replenishing pump 621 stops; when the liquid inlet and outlet pressure difference △P_b of the battery cluster temperature control flow path is less than △P_down, where △P_b=Pow_b-Piw_b, the battery cluster liquid replenishing pump 621 is turned on to inject the coolant in the liquid replenishing tank 6 into the battery cluster temperature control flow path; when △P_b≥P_down, the battery cluster liquid replenishing pump 621 stops.

[0106] When the outlet liquid pressure Pow_p of the PCS temperature control flow path is less than P_down, the PCS liquid replenishment pump 611 is turned on to inject the refrigerant in the liquid replenishment tank 6 into the PCS temperature control flow path. When Pow_p≥P_down, the PCS liquid replenishment pump 611 stops; when the inlet liquid pressure Piw_p of the PCS temperature control flow path is less than P_down, the PCS liquid replenishment pump 611 is turned on to inject the refrigerant in the liquid replenishment tank 6 into the PCS temperature control flow path. When Piw_p≥P_down, the PCS liquid replenishment pump 611 stops; when the inlet and outlet liquid pressure difference △P_p of the PCS temperature control flow path is less than △P_down, where △P_p=Pow_p-Piw_p, the PCS liquid replenishment pump 611 is turned on to inject the refrigerant in the liquid replenishment tank 6 into the PCS temperature control flow path. When △P_p≥P_down, the PCS liquid replenishment pump 611 stops.

[0107] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0108] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An energy storage liquid cooling system, characterized in that: include: A box body, on which a PCS liquid outlet, a PCS liquid return port, a battery cluster liquid outlet and a battery cluster liquid return port are formed; A PCS temperature control component is arranged in the box, and comprises an air cooler, one end of the air cooler is connected to the PCS liquid outlet, and the other end of the air cooler is connected to the PCS liquid return port; A battery cluster temperature control component, which is arranged in the box, one end of which is connected to the battery cluster liquid outlet, and the other end of which is connected to the battery cluster liquid return port; A refrigeration component, which is arranged in the box; A heat exchanger, wherein the cold end of the heat exchanger is connected to the battery cluster temperature control component; and the cold supply end of the heat exchanger is connected to the refrigeration component; The air cooler is stacked above the refrigeration assembly, and the refrigeration assembly is configured to cool the battery cluster temperature control assembly.

2. The energy storage liquid cooling system according to claim 1, characterized in that: The battery cluster temperature control component comprises: First expansion tank; First circulation pump; The battery cluster liquid return port, the first expansion tank, the first circulation pump, the cold end of the heat exchanger and the battery cluster liquid outlet are sequentially connected to form a battery cluster temperature control flow path.

3. The energy storage liquid cooling system according to claim 2, characterized in that: The battery cluster temperature control component also includes: The first electric heater is disposed on the battery cluster temperature control flow path and is configured to be electrically powered to heat the coolant in the battery cluster temperature control flow path.

4. The energy storage liquid cooling system according to claim 1, characterized in that: The refrigeration assembly comprises: compressor; A condenser, which is stacked above the air cooler; Electronic expansion valve; Wherein, the compressor, the condenser, the electronic expansion valve and the cooling end of the heat exchanger are sequentially connected to form a refrigerant circulation flow path.

5. The energy storage liquid cooling system according to claim 2, characterized in that: The PCS temperature control component also includes: Second circulation pump; Second expansion tank; A temperature control branch, wherein the air cooler is arranged on the temperature control branch; The PCS liquid outlet, the temperature control branch, the second circulation pump, the second expansion tank and the PCS liquid return port are sequentially connected to form a PCS temperature control flow path.

6. The energy storage liquid cooling system according to claim 5, characterized in that: The PCS temperature control component also includes: The second electric heater is arranged on the PCS temperature control flow path and located between the PCS liquid outlet and the temperature control branch, and is configured to be electrically powered to heat the coolant in the PCS temperature control flow path.

7. The energy storage liquid cooling system according to claim 6, characterized in that: The temperature control branch comprises: a first bypass branch, the air cooler being arranged on the first bypass branch; The second bypass branch is connected in parallel with the first bypass branch and is connected between the second electric heater and the second circulation pump.

8. The energy storage liquid cooling system according to claim 7, characterized in that: The PCS temperature control component also includes: An electrically controlled valve is provided on the first bypass branch and / or the second bypass branch and is configured to adjust the opening of the first bypass branch and the second bypass branch.

9. The energy storage liquid cooling system according to claim 5, characterized in that: The energy storage liquid cooling system also includes: A liquid replenishing tank, which is arranged in the box body, and the liquid outlet end of the liquid replenishing tank is respectively connected with the PCS temperature control flow path through the second branch and is connected with the battery cluster temperature control flow path through the first branch; A battery cluster pressure relief valve, which is arranged in the battery cluster temperature control flow path and is connected to the liquid inlet end of the liquid replenishing tank through a third branch; A PCS pressure relief valve, which is arranged on the PCS temperature control flow path and is connected to the return liquid end of the liquid replenishing tank through a fourth branch; A battery cluster refilling pump, which is arranged on the first branch; A PCS fluid replenishing pump is arranged on the second branch.

10. An energy storage liquid cooling system, characterized in that: include: A box body, on which a PCS liquid outlet, a PCS liquid return port, a battery cluster liquid outlet and a battery cluster liquid return port are formed; A PCS temperature control component is arranged in the box, and comprises an air cooler, one end of the air cooler is connected to the PCS liquid outlet, and the other end of the air cooler is connected to the PCS liquid return port; A battery cluster temperature control component, which is arranged in the box, one end of which is connected to the battery cluster liquid outlet, and the other end of which is connected to the battery cluster liquid return port; A refrigeration component, which is arranged in the box; A heat exchanger is arranged in the box, wherein the cold end of the heat exchanger is connected to the battery cluster temperature control component; and the cold supply end of the heat exchanger is connected to the refrigeration component; The PCS temperature control component is cooled by the air cooler, the air cooler is stacked on top of the cooling component, and the cooling component and the battery cluster temperature control component perform heat exchange with each other through the heat exchanger to cool the battery cluster temperature control component.

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