CN219841698U - Immersed liquid cooling indirect energy storage system - Google Patents
Immersed liquid cooling indirect energy storage system Download PDFInfo
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- CN219841698U CN219841698U CN202320421618.XU CN202320421618U CN219841698U CN 219841698 U CN219841698 U CN 219841698U CN 202320421618 U CN202320421618 U CN 202320421618U CN 219841698 U CN219841698 U CN 219841698U
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- 238000001816 cooling Methods 0.000 title claims abstract description 134
- 239000007788 liquid Substances 0.000 title claims abstract description 104
- 238000004146 energy storage Methods 0.000 title claims abstract description 53
- 239000000110 cooling liquid Substances 0.000 claims abstract description 28
- 238000005057 refrigeration Methods 0.000 claims abstract description 20
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 12
- 238000007654 immersion Methods 0.000 claims description 9
- 238000009825 accumulation Methods 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 6
- 239000003507 refrigerant Substances 0.000 claims description 4
- 239000012809 cooling fluid Substances 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 claims description 2
- 239000000243 solution Substances 0.000 description 10
- 239000007864 aqueous solution Substances 0.000 description 9
- 230000017525 heat dissipation Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 125000003827 glycol group Chemical group 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model relates to the technical field of energy storage batteries, in particular to an immersed liquid-cooled indirect energy storage system. The immersed liquid cooling indirect energy storage system comprises a battery energy storage unit, a cooling unit and a refrigerating unit; the battery energy storage unit is used for placing a battery pack; the cooling unit comprises a heat exchanger and a cooling tower; the heat exchanger is arranged on the battery energy storage unit, and the cooling tower is respectively communicated with the heat exchanger through a liquid return pipeline and a liquid inlet pipeline; the first liquid outlet end of the refrigerating unit is communicated with the liquid inlet pipeline through an electric three-way valve, and the second liquid outlet end of the refrigerating unit is communicated with the liquid inlet pipeline between the electric three-way valve and the cooling tower through a first electric valve; the liquid inlet end of the refrigeration unit is communicated with the liquid return pipeline through a first pipeline with a second electric valve; the utility model adopts the cooling units as main and the refrigeration units as auxiliary, not only reduces the consumption of the cooling liquid in the circulation system, but also can select different circulation refrigeration modes according to the temperature of the outdoor natural cold source.
Description
Technical Field
The utility model relates to the technical field of energy storage batteries, in particular to an immersed liquid-cooled indirect energy storage system.
Background
At present, the main technical means of cooling the battery energy storage system is to quickly conduct the heat of the battery to a cold source medium, and the temperature of the battery is controlled through heat exchange; common cooling modes include traditional air cooling, liquid cooling plates and immersed liquid cooling.
The air cooling system has the advantages of simple structure, easy realization and low initial investment cost, but has the defects of low cooling efficiency, large temperature difference among single battery cells, high power consumption and the like, and along with the continuous improvement of the energy density, capacity and working multiplying power of the lithium battery, the safety requirement of the large-scale energy storage system is difficult to meet.
The liquid cooling technology is mainly a cold plate technology and an immersed liquid cooling technology at present, a liquid inlet channel and a plurality of cooling branches connected with the liquid inlet channel are generally arranged in the existing cold plate, but the circulation efficiency of cooling liquid in the cooling branches far from the inlet of the liquid inlet channel is low, the heat dissipation efficiency of the cold plate is reduced, and the overall heat dissipation effect of the battery cell is poor; the cold plate can only take away the heat of the main heating components of the battery. Secondly, the glycol aqueous solution is mostly adopted as a heat exchange medium in the cold plate, so that the leakage of the glycol aqueous solution can cause short circuit, and the thermal runaway spreading reaction is easy to be initiated, thereby causing serious accidents. When the local battery core is in thermal runaway, the phenomenon that adjacent batteries are in thermal runaway and spread cannot be blocked; in addition, the flow resistance of the medium in the cold plate type is larger, the work of the circulating pump for overcoming the system resistance can be correspondingly increased, and the running cost of the equipment is indirectly increased.
In the direct immersion type system, a battery pack is directly immersed in a battery inserting box filled with cooling liquid, heat generated by a battery is transmitted to a system cold source through a cooling liquid carrier, but the cooling liquid usage amount in the whole direct immersion type circulating cooling system is large, meanwhile, the cooling liquid cost is generally high, and the use cost of liquid cooling is increased. Secondly, immersion systems typically require that the cabinet and the jack be provided with overflow means; in addition, the viscosity of the cooling liquid in the system is far greater than that of water, and the power consumption of the pump of the whole circulation system is increased.
The main technical means for cooling the battery energy storage system commonly used in the prior art has a plurality of problems, so that the cooling effect on the battery is poor, the current cooling requirement on the battery energy storage system cannot be met, and therefore, an immersed liquid cooling indirect energy storage system is needed to solve the technical problems in the prior art to a certain extent.
Disclosure of Invention
The utility model aims to provide an immersed liquid cooling indirect energy storage system so as to solve the technical problem that the cooling effect on a battery pack is not ideal in the prior art to a certain extent.
The utility model provides an immersed liquid cooling indirect energy storage system, which comprises: the battery energy storage unit, the cooling unit and the refrigerating unit;
the battery energy storage unit is used for placing a battery pack;
the cooling unit comprises a heat exchanger and a cooling tower; the heat exchanger is arranged on the battery energy storage unit, and the cooling tower is respectively communicated with the heat exchanger through a liquid return pipeline and a liquid inlet pipeline;
the first liquid outlet end of the refrigerating unit is communicated with the liquid inlet pipeline through an electric three-way valve, and the second liquid outlet end of the refrigerating unit is communicated with the liquid inlet pipeline between the electric three-way valve and the cooling tower through a first electric valve; the liquid inlet end of the refrigeration unit is communicated with the liquid return pipeline through a first pipeline with a second electric valve;
when the second electric valve is closed and the first electric valve is closed, the cooling unit opens a cooling mode when the first end of the electric three-way valve is communicated with the second end of the electric three-way valve;
when the second electric valve is opened, the first electric valve is closed, and the second end of the electric three-way valve is communicated with the third end of the electric three-way valve, the refrigerating unit opens a refrigerating mode;
when the second electric valve is opened and the first electric valve is opened, the first end of the electric three-way valve is communicated with the second end of the electric three-way valve, and the cooling unit and the refrigerating unit are in a mixed refrigerating mode.
In the above technical solution, further, the battery energy storage unit includes a battery plug box;
the battery pack and the heat exchanger are both arranged in the battery plug box, and the battery plug box is filled with cooling liquid;
the battery boxes are arranged in a plurality, and the battery boxes are arranged at intervals along a first direction to form a battery cluster;
the battery clusters are arranged in a plurality, and the battery clusters are arranged at intervals along the second direction.
In the above technical solution, further, a first cooling coil and an axial flow fan are disposed in the cooling tower;
the first cooling coil surrounds the axial flow fan; one end of the first cooling coil is communicated with the liquid inlet pipeline, and the other end of the first cooling coil is communicated with the liquid return pipeline.
In the above technical solution, further, a first hand valve, a blow-down valve, a fourth electric valve, a check valve, a temperature sensor, a pressure gauge, a second hand valve, a third electric valve and a third hand valve are sequentially arranged on the liquid inlet pipeline from the battery energy storage unit side to the cooling tower side;
the third hand valve is communicated with the first cooling coil;
one end of the first pipeline is communicated with the liquid inlet pipeline between the first hand valve and the third electric valve; the other end of the first pipeline is communicated with the refrigerating unit.
In the above technical solution, further, a fourth hand valve, a fifth electromagnetic valve, a filter, a variable frequency water pump, a fifth hand valve, a constant pressure expansion tank and a sixth hand valve are sequentially arranged on the liquid return pipeline from the battery energy storage unit side to the cooling tower side;
the sixth hand valve is communicated with the first cooling coil;
the electric three-way valve is arranged in the liquid return pipeline, the first end of the electric three-way valve is close to the sixth hand valve, and the second end of the electric three-way valve is close to the constant pressure expansion tank.
In the above technical scheme, further, the liquid return pipeline and the liquid inlet pipeline are filled with glycol aqueous solution.
In the above technical solution, further, the refrigeration unit includes a cold storage water tank, a condenser, an evaporator, and a second cooling coil;
the cold accumulation water tank is filled with water or glycol water solution;
the condenser is communicated with the evaporator through a second pipeline to form a refrigeration closed loop;
the first liquid outlet end of the second cooling coil pipe is communicated with the third end of the electric three-way valve, the second liquid outlet end of the second cooling coil pipe is communicated with one end of the first electric valve, and the other end of the first electric valve is communicated with the liquid inlet pipeline between the electric three-way valve and the sixth hand valve.
In the above technical solution, further, the second pipeline is filled with a refrigerant, and the second pipeline is provided with a compressor and an expansion valve.
In the above technical scheme, further, a temperature sensor is further arranged in the battery plug box, and the temperature sensor monitors the temperature of the cooling liquid in the battery plug box.
In the above technical scheme, the control device further comprises a control unit, wherein the control unit is respectively in communication connection with the electric three-way valve, the first electric valve and the second electric valve.
Compared with the prior art, the utility model has the beneficial effects that:
the utility model provides an immersed liquid cooling indirect energy storage system, which comprises: the battery energy storage unit, the cooling unit and the refrigerating unit;
the battery energy storage unit is used for placing a battery pack;
the cooling unit comprises a heat exchanger and a cooling tower; the heat exchanger is arranged on the battery energy storage unit, and the cooling tower is respectively communicated with the heat exchanger through a liquid return pipeline and a liquid inlet pipeline;
the first liquid outlet end of the refrigerating unit is communicated with the liquid inlet pipeline through an electric three-way valve, and the second liquid outlet end of the refrigerating unit is communicated with the liquid inlet pipeline between the electric three-way valve and the cooling tower through a first electric valve; the liquid inlet end of the refrigeration unit is communicated with the liquid return pipeline through a first pipeline with a second electric valve;
when the second electric valve is closed and the first electric valve is closed, the cooling unit opens a cooling mode when the first end of the electric three-way valve is communicated with the second end of the electric three-way valve;
when the second electric valve is opened, the first electric valve is closed, and the second end of the electric three-way valve is communicated with the third end of the electric three-way valve, the refrigerating unit opens a refrigerating mode;
when the second electric valve is opened and the first electric valve is opened, the first end of the electric three-way valve is communicated with the second end of the electric three-way valve, and the cooling unit and the refrigerating unit are in a mixed refrigerating mode.
The utility model adopts the cooling units as main and the refrigeration units as auxiliary, not only reduces the consumption of the cooling liquid in the circulation system, but also can select different circulation refrigeration modes according to the temperature of the outdoor natural cold source. For example, when the outdoor temperature is lower in winter, the refrigerating unit is directly turned off, and the cooling unit is adopted to dissipate heat so as to meet the system requirement; when the temperature is at the extreme temperature in summer, the refrigerating unit can be fully started according to the time period, so that cold accumulation is realized for the refrigerating unit, and the heat dissipation efficiency is improved; when the temperature section is in the transition season, the combined mode operation of the cooling unit and the refrigerating unit can be started, so that the aim of energy saving is fulfilled.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the overall structure of an immersion liquid cooled indirect energy storage system provided by the utility model;
fig. 2 is an enlarged view of the structure at a in fig. 1.
Reference numerals:
1-a first end; 2-a second end; 3-a third end; 5-a cooling tower; 6, a liquid return pipeline; 7-a liquid inlet pipeline; 8-an electric three-way valve; 9-a first electrically operated valve; 10-a second electrically operated valve; 12-battery plug-in box; 13-a first direction; 14-a second direction; 15-a first cooling coil; 16-an axial flow fan; 17-a first hand valve; 18-a blow-down valve; 19-fourth electrically operated valve; 20-check valve; 21-a temperature sensor; 22-pressure gauge; 23-a second hand valve; 24-a third electrically operated valve; 25-a third hand valve; 26-fourth hand valve; 27-a fifth solenoid valve; 28-a filter; 29-a variable-frequency water pump; 30-a fifth hand valve; 31-a constant pressure expansion tank; 32-a sixth hand valve; 33-a cold accumulation water tank; 34-a condenser; 35-an evaporator; 36-a second cooling coil; 38-battery cluster.
Detailed Description
The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown.
The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model.
All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
Referring to fig. 1, an immersion liquid cooling indirect energy storage system includes a battery energy storage unit, a cooling unit and a refrigerating unit; the utility model hopes to realize effective cooling of the battery in the battery energy storage unit through the interaction of the cooling unit and the refrigerating unit.
In this embodiment, the battery energy storage unit includes a battery pack and a battery receptacle 12; wherein, the battery insertion box 12 is filled with insulating cooling liquid, and the battery pack is arranged in the battery insertion box 12; the heat of the battery pack is directly exchanged with the cooling liquid when the battery pack is placed in the battery plug box 12 due to the excessively high temperature, so that the heat exchange (cooling) effect on the battery pack is realized.
Further, in order to improve the efficiency of cooling the battery pack, in this embodiment, the battery boxes 12 are provided with 5, 5 battery boxes 12 are arranged at intervals in the first direction 13 (the first direction 13 of both sides refers to the vertical direction) to form the battery clusters 38; further, the battery clusters 38 are provided in 3, and the 3 battery clusters 38 are arranged at intervals along the second direction 14 (the second direction 14 of this face refers to the horizontal direction). That is, the immersed liquid cooling indirect energy storage system can cool 15 battery packs at one time, and the cooling efficiency of the battery packs is greatly improved.
Notably, are: the number of battery boxes 12 and the number of battery clusters 38 of the present utility model are not limited to the above number, and may be more according to the actual circumstances.
In this embodiment, the cooling unit comprises a heat exchanger and a cooling tower 5; the heat exchanger is arranged in the battery plug box 12, and the outlet end and the inlet end of the heat exchanger extend out of the battery plug box 12; the outlet end of the heat exchanger is communicated with the cooling tower 5 through a liquid return pipeline 6, and the inlet end of the heat exchanger is communicated with the cooling tower 5 through a liquid inlet pipeline 7.
Specifically, a first cooling coil 15 and an axial flow fan 16 are provided in the cooling tower 5; wherein the first cooling coil 15 surrounds the axial flow fan 16; one end of the first cooling coil 15 is in communication with the liquid inlet line 7 and the other end is in communication with the liquid return line.
When the battery pack is placed in the battery box 12, firstly, heat of the battery exchanges heat with the cooling liquid in the battery box 12, the cooling liquid after heat exchange exchanges heat with the cooling unit for the second time (the cooling unit provides a cold source for the cooling liquid in the battery box 12), at this time, the cold source for the second time of heat exchange is provided by the cooling tower 5 (when the liquid in the liquid inlet pipeline 7 circulates to the first cooling coil 15, the heat transferred to the first cooling coil 15 is taken away by the axial flow fan 16, and cooling of the liquid in the first cooling coil 15 is further realized), namely, the heat generated by the battery can be replaced outdoors (the position of the cooling tower 5 is outdoors).
Specifically, the liquid inlet pipeline 7 and the liquid return pipeline are filled with glycol aqueous solution, namely, a circulation unit taking glycol aqueous solution as cooling liquid is adopted in the cooling unit; the utility model adopts the cooling liquid in the battery inserting box 12, and the glycol aqueous solution circulates in the cooling system, so that compared with the existing mode of adopting the cooling liquid, the utility model greatly reduces the use of the cooling liquid and reduces the higher cost caused by adopting the fluoridized liquid or the mineral synthetic oil as the cooling liquid; in addition, the glycol aqueous solution circulates in the cooling unit, instead of the cooling liquid commonly used in the prior art (the cooling liquid viscosity is higher than that of water, and the specific heat capacity is generally lower than that of water, which results in an increase in power consumption of the water pump of the cooling unit), thus reducing the power consumption of the variable frequency water pump 29 (the variable frequency water pump 29 is described below) in the cooling unit.
In this embodiment, the first liquid outlet end of the refrigeration unit is communicated with the liquid inlet pipeline 7 through the electric three-way valve 8, and the second liquid outlet end of the refrigeration unit is communicated with the liquid inlet pipeline 7 between the electric three-way valve 8 and the cooling tower 5 through the first electric valve 9; the liquid inlet end of the refrigeration unit is communicated with the liquid return pipeline 6 through a first pipeline with a second electric valve 10; in other words, the refrigeration unit of the present utility model is connected in parallel to the cooling tower 5.
Specifically, as shown in fig. 2, a first hand valve 17, a drain valve 18, a fourth electric valve 19, a check valve 20, a temperature sensor 21, a pressure gauge 22, a second hand valve 23, a third electric valve 24, and a third hand valve 25 are provided on the liquid intake pipe 7 in this order from the battery energy storage unit side to the cooling tower 5 side; the third hand valve 25 communicates with the first cooling coil 15; one end of the first pipeline is communicated with a liquid inlet pipeline 7 between the first hand valve 17 and the third electric valve 24; the other end of the first pipeline is communicated with the refrigerating unit.
Specifically, a fourth hand valve 26, a fifth electromagnetic valve 27, a filter 28, a variable frequency water pump 29, a fifth hand valve 30, a constant pressure expansion tank 31 and a sixth hand valve 32 are sequentially arranged on the liquid return pipeline 6 from the battery energy storage unit side to the cooling tower 5 side; the sixth hand valve 32 communicates with the first cooling coil 15; the electric three-way valve 8 is arranged on the liquid return pipeline 6, the first end 1 of the electric three-way valve 8 is close to the sixth hand valve 32, and the second end 2 of the electric three-way valve 8 is close to the constant pressure expansion tank 31.
Specifically, the refrigeration unit includes a cold storage water tank 33, a condenser 34, an evaporator 35, and a second cooling coil 36; the cold accumulation water tank 33 is filled with water or glycol aqueous solution; the condenser 34 communicates with the evaporator 35 through a second pipe to constitute a refrigeration closed circuit; the first liquid outlet end of the second cooling coil 36 is communicated with the third end 3 of the electric three-way valve 8, the second liquid outlet end of the second cooling coil 36 is communicated with one end of the first electric valve 9, and the other end of the first electric valve 9 is communicated with the liquid inlet pipeline 7 between the electric three-way valve 8 and the sixth hand valve 32.
Further, the second pipeline is filled with refrigerant, and a compressor and an expansion valve are arranged on the second pipeline.
In this embodiment, a temperature sensor is also provided within the battery compartment 12, the temperature sensor monitoring the temperature of the cooling fluid within the battery compartment 12.
In this embodiment, in order to improve the fluidity of the coolant in the battery box 12, the heat exchange efficiency to the battery pack is improved; specifically, the battery pack comprises a plurality of batteries which are arranged at intervals, and a flow field driving module (the flow field driving module is not shown in the figure and can be understood by a person skilled in the art) is arranged in a gap formed between the plurality of batteries, and preferably, the flow field driving module is a stirrer which strengthens the flow of cooling liquid so as to achieve the purpose of strengthening convection heat exchange.
In this embodiment, the submerged liquid cooled indirect energy storage system further comprises a control unit, which is in communication connection with the electric three-way valve 8, the first electric valve 9, the second electric valve 10 and the temperature sensor, respectively.
In the actual use process, the temperature sensor detects the temperature in the battery plug box 12 in real time and transmits the detected temperature to the control unit, and an analysis module in the control unit analyzes the temperature at the moment and makes a judgment to control the opening and closing of the electric three-way valve 8, the first electric valve 9 and the second electric valve 10, so that different cooling modes are selected, and the cooling modes are as follows:
when the second electric valve 10 is closed and the first electric valve 9 is closed, the first end 1 of the electric three-way valve 8 is connected with the second end 2 of the electric three-way valve 8, the cooling unit is in a cooling mode, so as to cool the cooling liquid and improve the heat dissipation efficiency, that is, the refrigerating unit is in a closed state, and the cooling unit is more suitable for the condition that the outdoor temperature is lower in winter (specifically, based on the temperature detected by the temperature sensor).
When the second electric valve 10 is opened, the first electric valve 9 is closed, and the second end 2 of the electric three-way valve 8 is communicated with the third end 3 of the electric three-way valve 8, the refrigerating unit is in a refrigerating mode; in this case, the temperature sensor is more suitable for the case of extreme temperatures in summer (specifically, the temperature detected by the temperature sensor).
When the second electric valve 10 is opened and the first electric valve 9 is opened, the cooling unit and the refrigerating unit are in the mixed refrigerating mode when the first end 1 of the electric three-way valve 8 is communicated with the second end 2 of the electric three-way valve 8. The mode is suitable for a transition season temperature section, and the cooling unit and the refrigerating unit can be started to operate in a combined mode, so that the aim of energy saving is fulfilled.
In summary, (1) the utility model provides an immersed liquid cooling indirect energy storage system, in which an immersed cooling liquid is directly filled in a battery plug box 12, a circulating medium of the cooling system is an ethylene glycol aqueous solution, and a circulating medium of the refrigerating system is a refrigerant. The heat generated by the charge and discharge of the battery is directly transferred to the heat exchanger by the cooling liquid through convection heat exchange, the heat exchange medium in the heat exchanger is glycol water solution which circularly flows, and the heat generated in the battery cluster 38 is transferred to an outdoor cold source through the variable-frequency water pump 29.
The heat exchange resistance inside the battery plug box 12 is obviously reduced, the temperature uniformity of each part of the battery pack is good, and the temperature difference fluctuation of the battery pack can be kept within 3 ℃. Not only improves the heat dissipation efficiency of the battery pack, but also improves the service life of the battery.
(3) The heat exchanger side adopts the cooling unit as the main and the refrigeration unit as the auxiliary, so that the consumption of cooling liquid in the circulating system is reduced, and different circulating refrigeration modes can be selected according to the temperature of the outdoor natural cold source. For example, when the outdoor temperature is lower in winter, the refrigerating unit is directly turned off, and the cooling unit is adopted to dissipate heat so as to meet the system requirement; when the temperature is at the extreme temperature in summer, the refrigerating unit can be fully started according to the time period, so that cold accumulation is realized for the refrigerating unit, and the heat dissipation efficiency is improved; when the temperature section is in the transition season, the combined mode operation of the cooling unit and the refrigerating unit can be started, so that the aim of energy saving is fulfilled.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.
Claims (10)
1. An immersion liquid cooled indirect energy storage system, comprising: the battery energy storage unit, the cooling unit and the refrigerating unit;
the battery energy storage unit is used for placing a battery pack;
the cooling unit comprises a heat exchanger and a cooling tower; the heat exchanger is arranged on the battery energy storage unit, and the cooling tower is respectively communicated with the heat exchanger through a liquid return pipeline and a liquid inlet pipeline;
the first liquid outlet end of the refrigerating unit is communicated with the liquid inlet pipeline through an electric three-way valve, and the second liquid outlet end of the refrigerating unit is communicated with the liquid inlet pipeline between the electric three-way valve and the cooling tower through a first electric valve; the liquid inlet end of the refrigeration unit is communicated with the liquid return pipeline through a first pipeline with a second electric valve;
when the second electric valve is closed and the first electric valve is closed, the cooling unit opens a cooling mode when the first end of the electric three-way valve is communicated with the second end of the electric three-way valve;
when the second electric valve is opened, the first electric valve is closed, and the second end of the electric three-way valve is communicated with the third end of the electric three-way valve, the refrigerating unit opens a refrigerating mode;
when the second electric valve is opened and the first electric valve is opened, the first end of the electric three-way valve is communicated with the second end of the electric three-way valve, and the cooling unit and the refrigerating unit are in a mixed refrigerating mode.
2. The immersion liquid cooled indirect energy storage system of claim 1, wherein the battery energy storage unit comprises a battery receptacle;
the battery pack and the heat exchanger are both arranged in the battery plug box, and the battery plug box is filled with cooling liquid;
the battery boxes are arranged in a plurality, and the battery boxes are arranged at intervals along a first direction to form a battery cluster;
the battery clusters are arranged in a plurality, and the battery clusters are arranged at intervals along the second direction.
3. The submerged, liquid cooled, indirect energy storage system of claim 1, wherein a first cooling coil and an axial flow fan are disposed within the cooling tower;
the first cooling coil surrounds the axial flow fan; one end of the first cooling coil is communicated with the liquid inlet pipeline, and the other end of the first cooling coil is communicated with the liquid return pipeline.
4. The submerged indirect-type liquid-cooled energy storage system of claim 3, wherein the liquid inlet pipeline is provided with a first hand valve, a blow-off valve, a fourth electric valve, a check valve, a temperature sensor, a pressure gauge, a second hand valve, a third electric valve and a third hand valve in sequence from the battery energy storage unit side to the cooling tower side;
the third hand valve is communicated with the first cooling coil;
one end of the first pipeline is communicated with the liquid inlet pipeline between the first hand valve and the third electric valve; the other end of the first pipeline is communicated with the refrigerating unit.
5. The immersed liquid-cooled indirect energy storage system according to claim 3, wherein a fourth hand valve, a fifth electromagnetic valve, a filter, a variable frequency water pump, a fifth hand valve, a constant pressure expansion tank and a sixth hand valve are sequentially arranged on the liquid return pipeline from the battery energy storage unit side to the cooling tower side;
the sixth hand valve is communicated with the first cooling coil;
the electric three-way valve is arranged in the liquid return pipeline, the first end of the electric three-way valve is close to the sixth hand valve, and the second end of the electric three-way valve is close to the constant pressure expansion tank.
6. The submerged indirect-type liquid-cooled energy storage system of claim 1, wherein the liquid return pipeline and the liquid inlet pipeline are filled with an aqueous glycol solution.
7. The submerged indirect-type liquid-cooled energy storage system of claim 5, wherein the refrigeration unit comprises a cold-storage tank, a condenser, an evaporator, and a second cooling coil;
the cold accumulation water tank is filled with water or glycol water solution;
the condenser is communicated with the evaporator through a second pipeline to form a refrigeration closed loop;
the first liquid outlet end of the second cooling coil pipe is communicated with the third end of the electric three-way valve, the second liquid outlet end of the second cooling coil pipe is communicated with one end of the first electric valve, and the other end of the first electric valve is communicated with the liquid inlet pipeline between the electric three-way valve and the sixth hand valve.
8. The submerged indirect-type liquid-cooled energy storage system of claim 7, wherein the second pipeline is filled with refrigerant and is provided with a compressor and an expansion valve.
9. The immersion liquid cooled indirect energy storage system of claim 2, wherein a temperature sensor is further disposed within the battery compartment, the temperature sensor monitoring a temperature of the cooling fluid within the battery compartment.
10. The immersion liquid cooled indirect energy storage system of claim 1, further comprising a control unit in communication with the electric three-way valve, the first electric valve, and the second electric valve, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320421618.XU CN219841698U (en) | 2023-03-01 | 2023-03-01 | Immersed liquid cooling indirect energy storage system |
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| Application Number | Priority Date | Filing Date | Title |
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