Liquid cooling unit with liquid supplementing function for energy storage system
By introducing a replenishment module into the liquid-cooling unit and automatically detecting and replenishing the liquid-cooling medium with hydraulic sensors, the problems of complex operation and low automation in the cooling liquid-cooling process of the existing liquid-cooling unit are solved, and the automatic liquid-cooling medium supplement of the liquid-cooling unit is realized, improving the reliability and automation level of the system.
Patent Information
- Application Number
- CN202421139209.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-23
- Publication Date
- 2025-03-18
- Estimated Expiration
- 2034-05-23
Smart Images

Figure CN222634813U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of refrigeration equipment, in particular to a liquid cooling unit for an energy storage system with a liquid replenishing function. Background Art
[0002] An energy storage system is a system used to store and release electrical energy. Its core components include battery packs / battery groups (collectively referred to as batteries). The batteries in the energy storage system will generate a large amount of heat during the charging and discharging process. If the heat cannot be discharged in time, the temperature of the energy storage system will increase, posing a safety hazard, and thus affecting the performance of the batteries and the normal operation of the energy storage system.
[0003] In order to control the temperature of the battery and improve the charging and discharging efficiency of the battery, a heat dissipation system needs to be configured in the energy storage system to dissipate heat for the battery. Among them, liquid cooling is the most widely used heat dissipation solution.
[0004] The liquid cooling unit needs to be filled with a sufficient amount of coolant before operation and during normal operation. The liquid cooling unit in the prior art usually uses an external refilling pump to fill the coolant. When the coolant is filled, the liquid cooling unit needs to be started to circulate the coolant to ensure that the coolant is fully filled. In the above process, it is necessary to pay attention to the operation of the refilling pump, the liquid cooling unit and the control center (such as the control screen) at the same time, which is prone to leakage. In addition, due to factors such as evaporation and leakage, the coolant in the liquid cooling unit will be consumed during operation and needs to be replenished regularly or according to demand. At this time, it is necessary to connect an external refilling pump to the liquid cooling unit, which will obviously generate additional workload.
[0005] In summary, how to provide a liquid cooling unit for an energy storage system with an automatic liquid replenishment function has become an urgent problem to be solved. Utility Model Content
[0006] The utility model aims to provide a liquid cooling unit for an energy storage system with a liquid replenishing function, which can selectively add liquid cooling medium to the liquid cooling module according to the hydraulic pressure at at least one node of the liquid cooling module.
[0007] To achieve the above-mentioned objectives, the utility model provides the following technical solutions: a liquid cooling unit for an energy storage system with a fluid replenishment function, comprising a refrigeration module, a liquid cooling module and a heat exchanger; the liquid cooling module can exchange heat with at least a part of the energy storage system; the refrigeration module is connected to the refrigerant channel of the heat exchanger, so that the refrigerant can circulate between the refrigeration module and the heat exchanger, the liquid cooling module is connected to the liquid-cooling medium channel of the heat exchanger, so that the liquid-cooling medium can circulate between the liquid-cooling module and the heat exchanger, and the refrigerant of the refrigeration module and the liquid-cooling medium of the liquid cooling module can exchange heat at the heat exchanger; it also includes a fluid replenishment module, which is connected to at least one node of the liquid cooling module; the fluid replenishment module can selectively add liquid cooling medium to the liquid cooling module according to the hydraulic pressure at at least one node of the liquid cooling module.
[0008] In the above technical solution, the refrigeration module includes a compressor, a condenser with a fan, and an expansion valve; the refrigerant channels of the compressor, the condenser, the expansion valve, and the heat exchanger are connected in sequence, so that the refrigerant can circulate between the refrigerant channels of the compressor, the condenser, the expansion valve, and the heat exchanger.
[0009] In the above technical solution, the liquid cooling module includes at least a main circulation pump and a liquid cooling plate capable of exchanging heat with a heat generating body; the main circulation pump, the liquid cooling plate and the liquid cooling medium channels of the heat exchanger are connected in sequence, so that the liquid cooling medium can circulate between the main circulation pump, the liquid cooling plate and the liquid cooling medium channels of the heat exchanger.
[0010] In the above technical solution, the fluid infusion module includes a fluid infusion pump and a fluid infusion water tank; the input end of the fluid infusion pump is connected to the fluid infusion water tank, and the output end of the fluid infusion pump is connected to at least one node of the liquid cooling module.
[0011] In the above technical solution, the output end of the liquid replenishment pump of the liquid replenishment module is connected to at least one of the following nodes: the liquid inlet of the liquid cooling plate of the liquid cooling module, the output end of the main circulation pump of the liquid cooling module, the liquid inlet of the liquid cooling medium channel of the heat exchanger, and the liquid outlet of the liquid cooling medium channel of the heat exchanger.
[0012] In the above technical solution, the fluid replenishment module also includes a stop valve; the stop valve is arranged between the fluid replenishment pump and the fluid replenishment water tank.
[0013] In the above technical solution, an inlet hydraulic pressure sensor is provided at the liquid inlet of the liquid cooling module, and an outlet hydraulic pressure sensor is provided at the liquid outlet of the liquid cooling module.
[0014] In the above technical solution, during the initial operation of the liquid cooling module, there are:
[0015] S1, running the rehydration pump of the rehydration module to fill the liquid cooling medium stored in the rehydration water tank into the liquid cooling module until the hydraulic pressure detected by the outlet hydraulic pressure sensor reaches 1.85Bar~2.15Bar, and then stopping the operation of the rehydration pump of the rehydration module;
[0016] S2, the main circulation pump of the liquid cooling module is running, so that the liquid cooling medium can circulate between the main circulation pump, the liquid cooling plate and the liquid cooling medium channel of the heat exchanger;
[0017] S3, after the main circulation pump of the liquid cooling module has been running for at least 30 minutes, if the hydraulic pressure detected by the inlet hydraulic sensor is less than 0.5 Bar, the rehydration pump of the rehydration module is operated again to continue to fill the liquid cooling medium stored in the rehydration water tank into the liquid cooling module until the hydraulic pressure detected by the outlet hydraulic sensor reaches 2.85 Bar to 3.15 Bar, and then the rehydration pump of the rehydration module is stopped;
[0018] S4. After the main circulation pump of the liquid cooling module has been running for at least 15 minutes, if the hydraulic pressure detected by the inlet hydraulic sensor is less than 0.5 Bar, the rehydration pump of the rehydration module is operated again to continue to fill the liquid cooling medium stored in the rehydration water tank into the liquid cooling module until the hydraulic pressure detected by the outlet hydraulic sensor reaches 2.85 Bar to 3.15 Bar, and then the rehydration pump of the rehydration module is stopped;
[0019] S5, repeat step S4 until the hydraulic pressure detected by the imported hydraulic pressure sensor is greater than 0.5 Bar;
[0020] During the operation of the liquid cooling module, there are:
[0021] If the hydraulic pressure detected by the inlet hydraulic pressure sensor is less than 0.2 Bar, the rehydration pump of the rehydration module is operated to fill the liquid cooling medium stored in the rehydration water tank into the liquid cooling module until the hydraulic pressure detected by the inlet hydraulic pressure sensor is greater than 1.2 Bar;
[0022] Furthermore, if the above steps are executed a threshold number of times or more within a threshold time, the liquid cooling module is determined to be in a liquid leakage state.
[0023] In the above technical solution, a low liquid level sensor is provided in the liquid replenishment water tank of the liquid replenishment module.
[0024] In the above technical solution, the liquid cooling module also includes a heater for heating the liquid cooling medium.
[0025] Compared with the prior art, the beneficial effects of the utility model are as follows: the liquid cooling unit for the energy storage system with the liquid replenishment function of the utility model is provided with a liquid replenishment module, which can selectively add liquid cooling medium to the liquid cooling module according to the hydraulic pressure at at least one node of the liquid cooling module. In this way, automatic liquid cooling medium filling is achieved for the liquid cooling unit to ensure that there is a sufficient amount of liquid cooling medium in the liquid cooling module. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 It is a schematic diagram of the system structure of the utility model.
[0027] The accompanying drawings are marked as follows: 1. compressor; 2. condenser; 3. fan; 4. expansion valve; 5. heat exchanger; 6. heater; 7. battery pack; 8. main circulation pump; 9. liquid cooling plate; 10. replenishing pump; 11. stop valve; 12. replenishing water tank; 13. inlet hydraulic sensor; 14. outlet hydraulic sensor; 15. low liquid level sensor. DETAILED DESCRIPTION
[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0029] This embodiment provides a liquid cooling unit for an energy storage system with a liquid replenishment function, which can be used to provide heat dissipation for the energy storage system (especially the battery, power electronic devices, control system and transformer of the energy storage system).
[0030] See also Figure 1 The liquid cooling unit for the energy storage system with the liquid replenishing function of this embodiment includes a refrigeration module, a liquid cooling module and a heat exchanger 5.
[0031] Among them, the refrigeration module is based on refrigerant circulation and is used for refrigeration; the liquid cooling module is based on liquid cooling medium (such as pure water or formulated coolant) and is used to conduct heat from the heating element; the heat exchanger 5 is used for heat exchange between the refrigeration module and the liquid cooling module. In most cases, the heat exchanger 5 is a plate heat exchanger 5.
[0032] The liquid cooling module can exchange heat with at least a portion of the energy storage system to absorb heat generated by the energy storage system.
[0033] The refrigerant channel of the refrigeration module is connected with the refrigerant channel of the heat exchanger 5, so that the refrigerant can circulate between the refrigeration module and the heat exchanger 5. The liquid cooling module is connected with the liquid cooling medium channel of the heat exchanger 5, so that the liquid cooling medium can circulate between the liquid cooling module and the heat exchanger 5, and the refrigerant of the refrigeration module and the liquid cooling medium of the liquid cooling module can exchange heat at the heat exchanger 5.
[0034] Obviously, the liquid cooling module needs to be filled with a sufficient amount of liquid cooling medium during initial operation. In addition, during the operation of the liquid cooling module, the liquid cooling medium in the liquid cooling unit will be lost due to factors such as evaporation and leakage. In order to realize automatic filling of the liquid cooling medium, the liquid cooling unit for the energy storage system with a liquid replenishment function of this embodiment also includes a liquid replenishment module, which is connected to at least one node of the liquid cooling module. The liquid replenishment module can selectively add liquid cooling medium to the liquid cooling module according to the hydraulic pressure at at least one node of the liquid cooling module.
[0035] Specifically, the refrigeration module includes a compressor 1, a condenser 2 with a fan 3, and an expansion valve 4, wherein the compressor 1 is a compressor for compressing refrigerant in the refrigeration system, the condenser 2 is a condenser in the refrigeration system, which dissipates heat through its own fan 3, and the expansion valve 4 is an electronic expansion valve 4 in the refrigeration system; the refrigerant channels of the compressor 1, condenser 2, expansion valve 4 and heat exchanger 5 (used to act as an evaporator of the refrigeration system) are connected in sequence, so that the refrigerant can circulate between the refrigerant channels of the compressor 1, condenser 2, expansion valve 4 and heat exchanger 5; with this arrangement, the refrigeration function of the liquid cooling unit can be realized.
[0036] Specifically, the liquid cooling module includes at least a main circulation pump 8 and a liquid cooling plate 9 capable of exchanging heat with the heating element, wherein the main circulation pump 8 is a liquid pump capable of driving the flow of liquid cooling medium, and the liquid cooling plate 9 is a metal plate with good thermal conductivity and an internal flow channel, which is suitable for being attached / built-in to the heating element; the liquid cooling medium channels of the main circulation pump 8, the liquid cooling plate 9 and the heat exchanger 5 are connected in sequence, so that the liquid cooling medium can circulate between the liquid cooling medium channels of the main circulation pump 8, the liquid cooling plate 9 and the heat exchanger 5.
[0037] Furthermore, the liquid cooling module also includes a heater 6 for heating the liquid cooling medium. The heater 6 is an electric liquid heater 6 for preventing the liquid cooling medium from freezing at low temperature. In this embodiment, the heater 6 is connected between the liquid cooling medium channel of the heat exchanger 5 and the liquid cooling plate 9.
[0038] Specifically, the fluid replenishment module includes a fluid replenishment pump 10 and a fluid replenishment water tank 12, wherein the fluid replenishment pump 10 is a liquid pump capable of driving the flow of liquid cooling medium, and the fluid replenishment water tank 12 is a large-capacity water tank for storing liquid cooling medium; the input end of the fluid replenishment pump 10 is connected to the fluid replenishment water tank 12, and the output end of the fluid replenishment pump 10 is connected to at least one node of the liquid cooling module. It can be understood that the above-mentioned connection methods are all achieved through liquid pipelines.
[0039] More specifically, the output end of the liquid replenishment pump 10 of the liquid replenishment module is connected to at least one of the following nodes: the liquid inlet of the liquid cooling plate 9 of the liquid cooling module, the output end of the main circulation pump 8 of the liquid cooling module, the liquid inlet of the liquid cooling medium channel of the heat exchanger 5, and the liquid outlet of the liquid cooling medium channel of the heat exchanger 5.
[0040] In the present embodiment, the output end of the fluid replenishment pump 10 of the fluid replenishment module is connected to the liquid inlet of the liquid cooling plate 9 of the liquid cooling module, so that the liquid cooling plate 9 of the liquid cooling module is used as a buffer when filling the liquid cooling medium, thereby minimizing the hydraulic pressure applied by the fluid replenishment pump 10 of the fluid replenishment module to the main circulation pump 8 of the liquid cooling module during operation; it can be understood that it is only necessary to reserve an interface or a three-way interface at the liquid inlet of the liquid cooling plate 9 of the liquid cooling module to connect the output end of the fluid replenishment pump 10 of the fluid replenishment module to the liquid inlet of the liquid cooling plate 9 of the liquid cooling module.
[0041] Furthermore, the liquid replenishment module also includes a stop valve 11, which is an electrically controlled valve or a magnetically controlled valve; the stop valve 11 is arranged between the liquid replenishment pump 10 and the liquid replenishment water tank 12, that is, the stop valve 11 is located in the liquid pipeline between the liquid replenishment pump 10 and the liquid replenishment water tank 12; the stop valve 11 is arranged to quickly cut off the liquid cooling medium flowing to the liquid cooling module when needed, and can also quickly cut off the liquid cooling medium flowing back to the liquid replenishment water tank 12 when needed.
[0042] Furthermore, an inlet hydraulic sensor 13 is provided at the liquid inlet of the liquid cooling module, and an outlet hydraulic sensor 14 is provided at the liquid outlet of the liquid cooling module; specifically, the main circulation pump 8 of the liquid cooling module is usually integrated with the compressor 1 of the refrigeration module, the condenser 2 with the fan 3 and the expansion valve 4 in the same chassis / frame, and the liquid cooling plate 9 needs to exchange heat with the heating element. Therefore, the liquid cooling plate 9 is usually external. At this time, with the chassis / frame as the framework, the liquid inlet of the liquid cooling module is actually the liquid inlet of the main circulation pump 8 of the liquid cooling module, and the liquid outlet of the liquid cooling module is actually the interface connected to the liquid cooling plate 9 (in this embodiment, it is the liquid outlet of the heater 6); the inlet hydraulic sensor 13 and the outlet hydraulic sensor 14 can both detect the hydraulic pressure at the pipeline / interface, and can convert the hydraulic pressure into an electronic signal.
[0043] When the liquid cooling module is initially running, there are:
[0044] S1, running the rehydration pump 10 of the rehydration module to fill the liquid cooling medium stored in the rehydration water tank 12 into the liquid cooling module until the hydraulic pressure detected by the outlet hydraulic pressure sensor 14 reaches 1.85Bar~2.15Bar, and then stopping the operation of the rehydration pump 10 of the rehydration module;
[0045] S2, the main circulation pump 8 of the liquid cooling module is running, so that the liquid cooling medium can circulate between the main circulation pump 8, the liquid cooling plate 9 and the liquid cooling medium channel of the heat exchanger 5;
[0046] S3. After the main circulation pump 8 of the liquid cooling module has been running for at least 30 minutes, if the hydraulic pressure detected by the inlet hydraulic pressure sensor 13 is less than 0.5 Bar, the rehydration pump 10 of the rehydration module is operated again to continue to fill the liquid cooling medium stored in the rehydration water tank 12 into the liquid cooling module until the hydraulic pressure detected by the outlet hydraulic pressure sensor 14 reaches 2.85 Bar to 3.15 Bar, and then the rehydration pump 10 of the rehydration module is stopped;
[0047] S4. After the main circulation pump 8 of the liquid cooling module has been running for at least 15 minutes, if the hydraulic pressure detected by the inlet hydraulic pressure sensor 13 is less than 0.5 Bar, the rehydration pump 10 of the rehydration module is operated again to continue to fill the liquid cooling medium stored in the rehydration water tank 12 into the liquid cooling module until the hydraulic pressure detected by the outlet hydraulic pressure sensor 14 reaches 2.85 Bar to 3.15 Bar, and then the rehydration pump 10 of the rehydration module is stopped;
[0048] S5, repeat step S4 until the hydraulic pressure detected by the inlet hydraulic pressure sensor 13 is greater than 0.5 Bar;
[0049] During the operation of the liquid cooling module, there are:
[0050] If the hydraulic pressure detected by the inlet hydraulic pressure sensor 13 is less than 0.2 Bar, the refill pump 10 of the refill module is operated to fill the liquid cooling medium stored in the refill water tank 12 into the liquid cooling module until the hydraulic pressure detected by the inlet hydraulic pressure sensor 13 is greater than 1.2 Bar;
[0051] Furthermore, if the above steps are executed a threshold number of times or more within a threshold time, the liquid cooling module is judged to be in a liquid leakage state (and a prompt may be issued through the interactive device).
[0052] Furthermore, a low liquid level sensor 15 is provided in the replenishment water tank 12 of the replenishment module. When the hydraulic medium in the replenishment water tank 12 reaches a threshold liquid level or below, the low liquid level sensor 15 can output a certain electronic signal to prompt that the hydraulic medium in the replenishment water tank 12 reaches the lowest liquid level.
[0053] It can be understood that the liquid cooling unit for energy storage system with liquid replenishment function of this embodiment also includes a control device (such as an industrial control computer, a programmable controller with an interactive device, and an embedded system with an interactive device). The compressor 1, the fan 3, the expansion valve 4 of the refrigeration module, the main circulation pump 8 of the liquid cooling module, and the liquid replenishment pump 10 of the liquid replenishment module are all controlled by the control device, and the inlet hydraulic sensor 13, the outlet hydraulic sensor 14 and the low liquid level sensor 15 all output signals to the control device. In this way, the above-mentioned control or prompt function is realized.
[0054] In the liquid cooling unit for the energy storage system with the liquid replenishment function of this embodiment, when the main circulation pump 8 is in operation, the liquid cooling medium is driven to circulate between the main circulation pump 8, the liquid cooling plate 9 and the liquid cooling medium channel of the heat exchanger 5. When the liquid cooling medium flows through the liquid cooling plate 9, it can absorb the heat of the heating element (the battery pack 7 of the energy storage system in this embodiment) and transfer the heat to the heat exchanger 5. When the compressor 1 is in operation, the refrigerant is driven to circulate between the refrigerant channel of the compressor 1, the condenser 2, the expansion valve 4 and the heat exchanger 5. When the condensation passes through the heat exchanger 5, the heat exchanger 5 Acting as the evaporator of the refrigeration system, it can quickly cool the liquid-cooling medium in the heat exchanger 5. The cooled liquid-cooling medium is circulated again and connected to the liquid cooling plate 9 to absorb the heat of the heating element again, thereby achieving the effect of quickly cooling the heating element. In the above process, the heater 6 is used to heat the liquid-cooling medium at extremely low temperatures to prevent the liquid-cooling medium from solidifying and damaging the liquid-cooling module and the heat exchanger 5. The liquid replenishing module can selectively add liquid-cooling medium to the liquid-cooling module according to the hydraulic pressure at at least one node of the liquid-cooling module to ensure that there is a sufficient amount of liquid-cooling medium in the liquid-cooling module.
[0055] The liquid cooling unit for the energy storage system with the liquid replenishment function of the present embodiment is provided with a liquid replenishment module, which can selectively add liquid cooling medium to the liquid cooling module according to the hydraulic pressure at at least one node of the liquid cooling module. In this way, automatic liquid cooling medium filling is achieved for the liquid cooling unit to ensure that there is a sufficient amount of liquid cooling medium in the liquid cooling module.
[0056] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A liquid cooling unit for an energy storage system with a liquid replenishing function, comprising a refrigeration module, a liquid cooling module and a heat exchanger; The liquid cooling module is capable of exchanging heat with at least a portion of the energy storage system; The refrigeration module is connected to the refrigerant channel of the heat exchanger, so that the refrigerant can circulate between the refrigeration module and the heat exchanger, and the liquid cooling module is connected to the liquid cooling medium channel of the heat exchanger, so that the liquid cooling medium can circulate between the liquid cooling module and the heat exchanger, and the refrigerant of the refrigeration module and the liquid cooling medium of the liquid cooling module can exchange heat at the heat exchanger; It is characterized in that Also included is a fluid replenishment module, the fluid replenishment module being connected to at least one node of the liquid cooling module; The liquid replenishing module can selectively add liquid cooling medium to the liquid cooling module according to the hydraulic pressure at at least one node of the liquid cooling module.
2. The liquid cooling unit for an energy storage system with a liquid replenishing function according to claim 1, characterized in that: The refrigeration module includes a compressor, a condenser with a fan, and an expansion valve; The refrigerant channels of the compressor, the condenser, the expansion valve, and the heat exchanger are sequentially connected, so that the refrigerant can circulate among the refrigerant channels of the compressor, the condenser, the expansion valve, and the heat exchanger.
3. The liquid cooling unit for an energy storage system with a liquid replenishing function according to claim 1 or 2, characterized in that: The liquid cooling module at least includes a main circulation pump and a liquid cooling plate capable of exchanging heat with a heating element; The main circulation pump, the liquid cooling plate and the liquid cooling medium channels of the heat exchanger are sequentially connected, so that the liquid cooling medium can circulate among the main circulation pump, the liquid cooling plate and the liquid cooling medium channels of the heat exchanger.
4. The liquid cooling unit for an energy storage system with a liquid replenishing function according to claim 3, characterized in that: The fluid replenishment module includes a fluid replenishment pump and a fluid replenishment water tank; The input end of the fluid replenishment pump is connected to the fluid replenishment water tank, and the output end of the fluid replenishment pump is connected to at least one node of the liquid cooling module.
5. The liquid cooling unit for an energy storage system with a liquid replenishing function according to claim 4, characterized in that: The output end of the fluid infusion pump of the fluid infusion module is connected to at least one of the following nodes: The liquid inlet of the liquid cooling plate of the liquid cooling module, the output end of the main circulation pump of the liquid cooling module, the liquid inlet of the liquid cooling medium channel of the heat exchanger, and the liquid outlet of the liquid cooling medium channel of the heat exchanger.
6. The liquid cooling unit for an energy storage system with a liquid replenishing function according to claim 4, characterized in that: The liquid replenishment module also includes a stop valve; The stop valve is arranged between the liquid replenishing pump and the liquid replenishing water tank.
7. The liquid cooling unit for an energy storage system with a liquid replenishing function according to claim 4, characterized in that: An inlet hydraulic pressure sensor is arranged at the liquid inlet of the liquid cooling module, and an outlet hydraulic pressure sensor is arranged at the liquid outlet of the liquid cooling module.
8. The liquid cooling unit for an energy storage system with a liquid replenishing function according to claim 4, characterized in that: A low liquid level sensor is arranged in the liquid replenishment water tank of the liquid replenishment module.
9. The liquid cooling unit for an energy storage system with a liquid replenishing function according to claim 3, characterized in that: The liquid cooling module also includes a heater for heating the liquid cooling medium.