CN213636112U - Water chilling unit and energy storage system - Google Patents
Water chilling unit and energy storage system Download PDFInfo
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- CN213636112U CN213636112U CN202023198530.1U CN202023198530U CN213636112U CN 213636112 U CN213636112 U CN 213636112U CN 202023198530 U CN202023198530 U CN 202023198530U CN 213636112 U CN213636112 U CN 213636112U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The utility model discloses a water chilling unit, be applied to the energy storage system including the group battery, including working medium circulation system, working medium circulation system includes the external circulation water route and is used for the internal circulation water route with the group battery heat transfer, and the internal circulation water route is including being used for carrying out the liquid heat transfer device of heat transfer with a side surface or the multilateral surface of group battery, and the external circulation water route forms the closed circulation water route that supplies heat transfer working medium circulation flow with the internal circulation water route, and the external circulation water route is equipped with the water pump that the drive heat transfer working medium flows, and the external circulation water route carries out the heat exchange through outside heat transfer device with outside. Compared with the traditional air cooling heat dissipation mode, the scheme can improve the heat exchange efficiency of the energy storage system, realize the energy-saving and uniform heat management targets and meet the heating requirement of the energy storage system. The utility model also discloses an energy storage system of including above-mentioned cooling water set.
Description
Technical Field
The utility model relates to an energy storage system technical field especially relates to cooling water set and energy storage system.
Background
Along with the rapid development of the energy storage industry, the density of the battery pack is higher and higher, correspondingly, the heat dissipation requirement of the battery pack is higher and higher, the battery pack needs to be rapidly dissipated, so that an ideal working temperature is reached, and adverse consequences such as shortening of the service life of the battery due to overheating of the battery pack are avoided. The existing battery pack cooling equipment adopts an air-cooled forced convection heat dissipation mode, so that the interior of a battery pack is difficult to cool, wind is difficult to disperse uniformly, and a certain dead zone exists. When the battery surface temperature is excessively high, the battery internal temperature tends to exceed the upper limit of the allowable temperature already, and therefore, the use and life of the battery pack are easily affected.
There is conversion efficiency loss in energy storage system's battery and process control system self, and the cable generates heat and thermal management system loss etc. in addition for energy storage system efficiency is not high, and then influences the degree of electricity cost, income promptly. The conventional thermal management system has high energy consumption for temperature control and single working mode, and cannot meet the requirements of energy conservation and emission reduction.
Therefore, how to achieve the goal of efficient, uniform and energy-saving thermal management of the energy storage system is a technical problem to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a be applied to energy storage system's cooling water set, this cooling water set can make energy storage system's the even heat transfer of group battery, realizes energy storage system high efficiency, even, energy-conserving thermal management target. Another object of the utility model is to provide an energy storage system including this cooling water set.
In order to achieve the above purpose, the utility model provides a following technical scheme:
the utility model provides a water chilling unit, is applied to the energy storage system including the group battery, includes working medium circulation system, working medium circulation system include external circulation water route and be used for with the internal circulation water route of group battery heat transfer, the internal circulation water route including be used for with a side surface or the multiple side surface of group battery carry out the liquid heat transfer device of heat transfer, the external circulation water route with the internal circulation water route forms the closed circulation water route that supplies heat transfer working medium circulation flow, the external circulation water route is equipped with the drive the water pump that heat transfer working medium flows, the external circulation water route carries out the heat exchange through external heat transfer device with outside heat transfer source.
Preferably, the water chilling unit comprises at least two external heat exchange devices, and the external circulating water path is independently communicated with any one of the external heat exchange devices or is communicated with any more than two external heat exchange devices in parallel or in series through a multi-position multi-way valve.
Preferably, the external circulation water path includes a water inlet pipeline, a water outlet pipeline, a first external heat exchange device and a second external heat exchange device, the multi-position multi-way valve includes a first four-way valve, a first three-way valve and a second three-way valve, four ports of the first four-way valve are respectively communicated with an inlet of the first external heat exchange device, an inlet of the second external heat exchange device, the water inlet pipeline and the second three-way valve, three ports of the first three-way valve are respectively communicated with an outlet of the first external heat exchange device, the water outlet pipeline and the second three-way valve, and the second three-way valve is further communicated with an outlet of the second external heat exchange device.
Preferably, the external heat exchange device comprises a liquid-liquid heat exchange device for exchanging heat with an external liquid heat exchange source and/or an air-liquid heat exchange device for exchanging heat with an external air heat exchange source.
Preferably, the liquid-liquid heat exchange device is any one of a plate heat exchanger, a shell-and-tube heat exchanger and a water bath heat exchanger, and the air-liquid heat exchange device is any one of a coil heat exchanger, a finned heat exchanger and a dry cooler.
Preferably, the water chilling unit further comprises an external liquid heat exchange source system for providing an external liquid heat exchange source, and the external liquid heat exchange source system and the external circulating water path exchange heat through the liquid-liquid heat exchange device.
Preferably, the external liquid heat exchange source system is a mechanical refrigeration system, the mechanical refrigeration system comprises a compressor, a condenser, an electronic expansion valve and the liquid-liquid heat exchange device which are circularly connected by a refrigerant circulating pipeline, and a refrigerant working medium circularly flows in the refrigerant circulating pipeline.
Preferably, the mechanical refrigeration system further comprises a condensing fan, the water pump is a variable frequency water pump, and/or the compressor is a variable frequency compressor, and/or the condensing fan is a variable frequency condensing fan.
Preferably, the liquid heat exchange device comprises a liquid heat exchange plate paved below the battery pack;
and/or the liquid heat exchange device comprises a liquid heat exchange water tank, and the battery pack is immersed in a heat exchange working medium in the liquid heat exchange water tank.
Preferably, the water pump is disposed between an inlet of the external circulation water path and the external heat exchange device, and a filter is disposed between the inlet of the external circulation water path and the water pump.
Preferably, the external circulation water route be in the filter with be provided with the buffer pipeline between the water pump, the buffer pipeline is the tee bend pipeline, the first end of buffer pipeline with the export intercommunication of filter, the second end of buffer pipeline is connected with exhaust part and arranges up, the third end of buffer pipeline connect in the entry of water pump.
Preferably, the external circulation water channel is provided with a buffer water tank, the upper end of the buffer water tank is connected with an exhaust part and a safety valve, a liquid storage box for containing the heat exchange working medium is arranged on the outer side of the buffer water tank, and the safety valve is connected to the liquid storage box through an overflow pipeline.
Preferably, a water return port and/or a water inlet port of the internal circulation water path are/is provided with a temperature sensor for detecting the temperature of the heat exchange working medium.
The utility model provides a water chilling unit, be applied to the energy storage system including the group battery, including working medium circulation system, working medium circulation system includes the external circulation water route and is used for the internal circulation water route with the group battery heat transfer, the internal circulation water route is including being used for carrying out the liquid heat transfer device of heat transfer with a side surface or the multiple side surface of group battery, the external circulation water route forms the closed circulation water route that supplies heat transfer working medium circulation flow with the internal circulation water route, the external circulation water route is equipped with the water pump that the drive heat transfer working medium flows, the external circulation water route carries out the heat exchange through outside heat transfer device with outside heat transfer source.
The working principle of the utility model is as follows:
when energy storage system has the refrigeration demand, start working medium circulation system's water pump and make heat transfer working medium circulation flow, heat transfer working medium is by energy storage system heating back, get into the external circulation water route from the return water mouth in internal circulation water route, the higher heat transfer working medium of temperature obtains microthermal heat transfer working medium after external heat transfer device department and microthermal outside heat exchange source carry out the heat transfer, microthermal heat transfer working medium lets in the internal circulation water route again and goes the group battery that cools off and generate heat through liquid heat transfer device, at last rethread return water mouth flows back to the external circulation water route, thereby realize energy storage system's cooling.
When the energy storage system has a heating demand, a water pump of the working medium circulating system is started to enable heat exchange working media to flow circularly, the heat exchange working media are cooled by the energy storage system and then enter the external circulating water path from a water return port of the internal circulating water path, the heat exchange working media with lower temperature exchange are subjected to heat exchange at the external heat exchange device and a high-temperature external heat exchange source to obtain the heat exchange working media after being heated, the heat exchange working media with higher temperature are introduced into the internal circulating water path again and are used for heating the low-temperature battery pack through the liquid heat exchange device, and finally, the heat exchange working media flow back to the external circulating water path.
When the energy storage system does not have the refrigeration and the demand of heating, this scheme can only start working medium circulation system, makes the heat transfer working medium realize self-loopa cooling, and then the difference in temperature of the every group battery of balanced energy storage system, can also practice thrift the energy consumption more.
This scheme adopts the liquid heat transfer device who carries out the heat transfer with the group battery surface to realize energy storage system's cooling cycle and heating cycle, compares in traditional forced air cooling radiating mode, and the heat exchange coefficient between this scheme liquid heat transfer working medium and the group battery is higher, and cooling and heating efficiency are higher, simultaneously, avoid producing the heat transfer blind spot, and the heat transfer working medium that utilizes the circulation to flow can be to group battery surface even cooling or heating, improves the heat transfer homogeneity of each group battery. In addition, the scheme can effectively utilize an external natural cold source, a natural heat source and other heat exchange sources through the external heat exchange device, so that multiple working modes are realized, different cold or heat quantities are output according to different working conditions of the battery pack, and the heat management target of energy conservation and emission reduction is further met. Therefore, the scheme can improve the heat exchange efficiency of the energy storage system, realize the aims of energy conservation and uniform heat management, and meet the heating requirement of the energy storage system.
The utility model also provides an energy storage system of including any kind of above-mentioned cooling water set. The derivation process of the beneficial effects generated by the energy storage system is substantially similar to the derivation process of the beneficial effects brought by the water chilling unit, and therefore, the description is omitted here.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view of an operating principle of a water chiller according to an embodiment of the present invention;
fig. 2 is a schematic layout diagram of a water chiller according to an embodiment of the present invention when the water chiller is applied to an energy storage system;
FIG. 3 is a schematic view of a first liquid heat exchange device according to an embodiment of the present invention;
FIG. 4 is a schematic view of a second liquid heat exchange device according to an embodiment of the present invention;
FIG. 5 is a schematic view of a buffer pipeline according to an embodiment of the present invention;
fig. 6 is a schematic structural view of a buffer water tank in an embodiment of the present invention;
fig. 7 is a schematic view of the working principle of the water chiller according to the embodiment of the present invention in the low temperature energy saving mode;
fig. 8 is a schematic view of the working principle of the water chiller in the low-temperature energy-saving refrigeration mode according to the embodiment of the present invention;
fig. 9 is a schematic view of the working principle of the water chiller according to the embodiment of the present invention in the cooling mode;
fig. 10 is a schematic view of the working principle of the water chiller including three external heat exchangers according to the embodiment of the present invention.
The meaning of the various reference numerals in figures 1 to 10 is as follows:
1-battery pack, 2-liquid heat exchange device, 3-water return pipeline, 4-temperature sensor, 5-water inlet pipeline, 6-filter, 7-buffer pipeline, 8-water pump, 9-first external heat exchange device, 10-exhaust valve, 11-buffer water tank, 12-safety valve, 13-liquid storage box, 14-water outlet pipeline, 15-water supply pipeline, 16-compressor, 17-condenser, 18-condensing fan, 19-electronic expansion valve, 20-water pump frequency conversion controller, 21-compressor frequency conversion controller, 22-condensing fan frequency conversion controller, 23-refrigerant circulation pipeline, 24-liquid supplement port, 25-liquid heat exchange plate, 26-liquid heat exchange water tank, 30-water return port connector, 30-temperature sensor, and the like, 151-water supply port joint, 121-overflow pipeline, 27-second external heat exchange device, 28-third external heat exchange device, 31-first three-way valve, 32-second three-way valve, 41-first four-way valve, 42-second four-way valve, 43-third four-way valve, 51-first external heat exchange source, 52-second external heat exchange source, 53-third external heat exchange source, 100-unit cabin body, 200-energy storage system cabinet body, 300-battery pack, 101-external circulation water channel and 201-internal circulation water channel.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1 to 6, fig. 1 is a schematic view of a circulation arrangement of components of a water chiller according to an embodiment of the present invention; fig. 2 is a schematic layout diagram of a water chiller according to an embodiment of the present invention when the water chiller is applied to an energy storage system; FIGS. 3 and 4 are schematic views of a first liquid heat exchange device and a second liquid heat exchange device, respectively, according to an embodiment of the present invention; FIG. 5 is a schematic view of a buffer pipeline according to an embodiment of the present invention; fig. 6 is a schematic structural diagram of a buffer water tank in an embodiment of the present invention.
The utility model provides a water chilling unit, be applied to the energy storage system including group battery 1, including working medium circulation system, as shown in fig. 1, the circulation system that is located the left side of liquid-liquid heat transfer device in fig. 1 is working medium circulation system, working medium circulation system includes external circulation water route 101 and is used for the internal circulation water route 201 with group battery 1 heat transfer, internal circulation water route 201 includes the liquid heat transfer device 2 that is used for carrying out the heat transfer with one side surface or the multiple side surface of group battery 1, external circulation water route 101 forms the closed circulation water route that supplies heat transfer working medium circulation flow with internal circulation water route 201, external circulation water route 101 is equipped with the water pump 8 that drives heat transfer working medium flow, external circulation water route 101 and external heat transfer source carry out the heat exchange. In addition, the water chilling unit further comprises a unit bin body 100, as shown in fig. 2, a liquid supplementing port 24 is arranged below the unit bin body 100, when the heat exchange working medium in the working medium circulating system is reduced, the heat exchange working medium can be supplemented through the liquid supplementing port 24, the heat exchange working medium in the working medium circulating system can be water, glycol or other secondary refrigerants, and a glycol water solution is preferably adopted as the heat exchange working medium in the scheme.
The working principle of the utility model is as follows:
when the energy storage system has the refrigeration demand, the water pump 8 of the working medium circulation system is started to enable the heat exchange working medium to flow circularly, the heat exchange working medium heated by the energy storage system enters the external circulation water channel 101 from the water return port of the internal circulation water channel 201, the heat exchange working medium with higher temperature is subjected to heat exchange with a low-temperature external heat exchange source at the external heat exchange device to obtain the low-temperature heat exchange working medium, the low-temperature heat exchange working medium is introduced into the internal circulation water channel 201 again and cools the heating battery pack 1 through the liquid heat exchange device 2, and finally the low-temperature heat exchange working medium flows back to the external circulation water channel 101 through the.
When the energy storage system has a heating demand, the water pump 8 of the working medium circulating system is started to enable the heat exchange working medium to circularly flow, the heat exchange working medium cooled by the energy storage system enters the external circulating water channel 101 from the water return port of the internal circulating water channel 201, the heat exchange working medium with lower temperature exchanges heat with the high-temperature external heat exchange source at the external heat exchange device to obtain the heat exchange working medium after heating, the heat exchange working medium with higher temperature is introduced into the internal circulating water channel 201 again and is heated by the liquid heat exchange device 2 to the low-temperature battery pack 1, and finally, the heat exchange working medium flows back to the external circulating water channel 101 through the water return port, so that.
When the energy storage system does not have the refrigeration and the demand of heating, this scheme can only start working medium circulation system, makes the heat transfer working medium realize self-loopa cooling, and then the difference in temperature of balanced energy storage system's every group battery 1, can also practice thrift the energy consumption more.
It should be noted that the high temperature and the low temperature mentioned herein refer to the relative temperatures of the liquid circulating in the different pipes of the circulation system.
This scheme adopts and carries out the liquid heat transfer device 2 of heat transfer with group battery 1 surface and realize energy storage system's cooling cycle and heating cycle, compares in traditional forced air cooling radiating mode, and the heat exchange coefficient between this scheme liquid heat transfer working medium and the group battery 1 is higher, and the heat exchange efficiency when cooling and heating is higher, simultaneously, avoids producing the heat transfer blind spot, and the heat transfer working medium that utilizes the circulation to flow can be to group battery 1 surface even cooling or heating, improves each group battery 1's heat transfer homogeneity. Therefore, the scheme can improve the heat exchange efficiency of the energy storage system, realize the homogenization heat management target and meet the heating requirement of the energy storage system.
It should be noted that the internal circulation water path 201 of the working medium circulation system is mainly used for exchanging heat with the battery pack 1 in the energy storage system to cool and heat the battery pack 1, and the external circulation water path 101 is used for exchanging heat with an external heat exchange source in the outside of the energy storage system to obtain a low-temperature or high-temperature heat exchange working medium. Specifically, the internal circulation water route 201 includes return water pipeline 3 and supply line 15, heat transfer working medium in the external circulation water route 101 enters into the inside liquid heat transfer device 2 of energy storage system through supply line 15, the heat transfer working medium after finishing the heat exchange with group battery 1 flows back to the external circulation water route 101 through return water pipeline 3 again, the water inlet of supply line 15 is the water inlet (or the water supply mouth of internal circulation water route 201) of internal circulation water route 201, the delivery port of return water pipeline 3 then is the delivery port of internal circulation water route 201 (the return water mouth of internal circulation water route 201 promptly). The external circulation water channel 101 comprises a water inlet pipeline 5 and a water outlet pipeline 14, the heat exchange working medium flowing back from the water return pipeline 3 flows into the water inlet pipeline 5, the heat exchange working medium sequentially flows through a water pump 8, an external heat exchange device and other equipment and then is introduced into the water supply pipeline 15 through the water outlet pipeline 14, therefore, the water inlet of the water inlet pipeline 5 is the water inlet of the external circulation water channel 101, the water outlet of the water outlet pipeline 14 is the water outlet of the external circulation water channel 101, the water pump 8 is arranged on the water inlet pipeline 5 or the water outlet pipeline 14, and the water pump 8 provides continuous circulation power for the circulation flow of the heat exchange working medium in the.
It should be noted that, the utility model provides a liquid heat transfer device 2 can design for multiple structural style, for example designs for the liquid heat transfer board 25 or the liquid cooling tubular construction that supply heat transfer working medium circulation to flow, perhaps designs for water tank structure, box structure etc. and can be separated by between heat transfer working medium and the group battery 1 has liquid heat transfer device 2's lateral wall, and heat transfer working medium also can with group battery 1 surface direct contact. In a preferred scheme, liquid heat transfer device 2 is including laying the liquid heat transfer board 25 in group battery 1 below, as shown in fig. 3, liquid heat transfer board 25 is located group battery 1 bottom, and liquid heat transfer board 25 is inside to lead to there is endless heat transfer working medium, through heat-conducting mode cooling group battery 1, and liquid heat transfer board 25 is equipped with water supply port joint 151 and is used for letting in microthermal heat transfer working medium, still is equipped with the heat transfer working medium outflow of the high temperature that water return port joint 30 is used for after the heat transfer. In another preferred scheme, the liquid heat exchange device 2 includes a liquid heat exchange water tank 26, and the battery pack 1 is immersed in a heat exchange working medium in the liquid heat exchange water tank 26, as shown in fig. 4, the liquid heat exchange water tank 26 is also provided with a water supply port connector 151 and a water return port connector 30, and when the heat exchange working medium circularly flows, heat exchange can be performed with each side surface of the battery pack 1, so as to further improve heat exchange efficiency and improve temperature uniformity of the battery pack 1. Of course, the energy storage system is generally provided with a plurality of battery PACKs 1, as shown in fig. 2, a plurality of battery PACKs 300 (PACK in fig. 2 represents a battery PACK) are generally arranged in one energy storage system cabinet 200, and each battery PACK 300 can be arranged with a plurality of battery PACKs 1, so the utility model discloses can also use the above-mentioned liquid heat exchange plate 25 and the liquid heat exchange device 2 of these two types of liquid heat exchange water tank 26 in combination.
Preferably, the water return port of the internal circulation water path 201 and/or the water inlet port of the internal circulation water path 201 is provided with a temperature sensor 4 for detecting the temperature of the heat exchange working medium, the temperature of the heat exchange working medium which flows back and/or the temperature of the heat exchange working medium which is introduced into the energy storage system can be monitored in real time through the temperature sensor 4, when the energy storage system has the refrigerating or heating requirement, the temperature of the heat exchange working medium flowing back from the water return pipeline 3 is deviated from the preset temperature, when the deviation exceeds a certain threshold value, the function of automatically starting the refrigeration cycle or the heating cycle can be realized by logically linking the temperature sensor 4 with the water pump 8, a control device of an external heat exchange source and the like, and the temperature sensor 4 arranged at the water inlet of the internal circulation water channel 201 (namely, at the water outlet of the external circulation water channel 101) can detect whether the heat exchange working medium subjected to heat exchange in the external circulation water channel 101 meets the temperature requirement required to be output by the water chilling unit or not in real time. In addition, the heating value of the battery pack 1 can be monitored and tracked through the temperature sensor 4, the output power of the water pump 8 and the output power of the external heat exchange source can be adjusted in real time through the start-stop control devices of the water pump 8 and the external heat exchange source according to the heating value detected by the temperature sensor 4, the corresponding cooling capacity and heat can be adjusted and output, frequent fluctuation of the temperature in the working medium circulating system is avoided, and the energy-saving and efficient heat management target is achieved.
In order to improve the reliability of the system, it is preferable that, as shown in fig. 1, the water pump 8 is disposed between the inlet of the external circulation water path 101 and the external heat exchange device, that is, the water pump 8 is disposed on the water inlet pipe 5, and a filter 6 is disposed between the inlet of the external circulation water path 101 (i.e., the inlet of the water inlet pipe 5) and the water pump 8 for filtering impurities in the heat exchange medium. The filter 6 can adopt a Y-shaped filter or a basket filter and the like, and the filter element can be repeatedly cleaned and replaced for use.
Further preferably, as shown in fig. 1 and 5, the water inlet pipeline 5 is provided with a buffer pipeline 7 between the filter 6 and the water pump 8, the buffer pipeline 7 is a three-way pipeline, a first end of the buffer pipeline 7 is communicated with an outlet of the filter 6, a second end of the buffer pipeline 7 is connected with an exhaust component and arranged upwards, and a third end of the buffer pipeline 7 is connected to an inlet of the water pump 8. The heat exchange working medium enters the water inlet pipeline 5 and then is filtered by the filter 6, and then passes through the buffer pipeline 7, wherein the buffer pipeline 7 can be a Y-shaped pipeline, a T-shaped pipeline and other branched three-way pipelines. Wherein, the exhaust part is preferably an exhaust valve 10, and the end of the buffer pipeline 7 provided with the exhaust part is arranged upwards, and is preferably arranged at the highest position of the system or a place where air is easy to store. As shown in fig. 5, after the heat exchange working medium carrying air enters the buffer pipeline 7 through the water inlet end, most of the air in the heat exchange working medium is lifted upwards and discharged through the exhaust part because the heat exchange working medium impacts the pipe wall of the buffer pipeline 7 at first, the liquid without air flows downwards out of the water outlet end, and the air possibly existing in the heat exchange working medium is discharged through the design of the buffer pipeline 7, so that the water pump 8 at the rear end can be effectively protected, the service life of the water pump 8 is prolonged, and the system maintenance frequency is reduced.
Preferably, the external circulation water channel 101 is provided with a buffer water tank 11, the buffer water tank 11 is preferably arranged on the water outlet pipeline 14, the upper end of the buffer water tank 11 is connected with an exhaust part and a safety valve 12, the exhaust part also preferably adopts an exhaust valve 10, the outer side of the buffer water tank 11 is provided with a liquid storage box 13 for containing a heat exchange working medium, and the safety valve 12 is connected to the liquid storage box 13 through an overflow pipeline 121. As shown in fig. 1 and fig. 6, the buffer water tank 11 is of a closed structure, and when the heat exchange working medium passes through the buffer water tank 11, air in the heat exchange working medium rises and is discharged from the exhaust part, so that the subsequent internal circulation water path 201 and the liquid heat exchange device 2 are prevented from being affected. When the internal pressure of the working medium circulating system is smaller than a preset pressure value, the safety valve 12 keeps a closed state, and when the internal pressure of the working medium circulating system reaches or exceeds the preset pressure value, the safety valve 12 automatically opens to release pressure, so that air and redundant heat exchange working medium in the system are discharged, and the stability of the pressure and water quantity of the system is maintained. When the safety valve 12 is opened for drainage, the liquid storage box 13 can collect the redundant heat exchange working medium discharged by the working medium circulating system, so that the liquid working medium can be conveniently recycled, and the scheme is more environment-friendly.
It should be noted that, the utility model provides an outside heat transfer device's quantity can be one or more, preferably, the cooling water set of this scheme includes two at least outside heat transfer device, external circulation water route 101 is through many multi-way valves realize with arbitrary one outside heat transfer device's independent switch-on or with the parallelly connected or the series connection intercommunication of outside heat transfer device more than arbitrary two, wherein, many multi-way valves refer to the valve that has a plurality of workplaces and have a plurality of openings, for example, two three-position three-way valves, three-position four-way valve etc., it can be in different workplaces according to the work needs, thereby communicate different openings. During practical application, can divide a plurality of battery operating modes according to the temperature of group battery 1 and the conditions such as power and the temperature of heat transfer working medium, this scheme can adopt corresponding thermal management mode to different battery operating modes, promptly, makes the heat transfer working medium of outside circulation water route 101 obtain different cold volumes or heat from outside heat exchange source through switching on arbitrary one or more than two outside heat transfer device, and then reaches energy-conserving efficient thermal management target.
In order to further refine the energy-saving effect, two same or different external heat exchange devices are arranged in a preferred scheme, namely, the heat exchange working medium can be communicated with any one external heat exchange device or two external heat exchange devices simultaneously through the multi-position multi-way valve so as to realize different working modes. Specifically, the external circulation water path 101 includes a water inlet pipeline 5, a water outlet pipeline 14, a first external heat exchange device 9 and a second external heat exchange device 27, the multi-position multi-way valve includes a first four-way valve 41, a first three-way valve 31 and a second three-way valve 32, four ports of the first four-way valve 41 are respectively communicated with an inlet of the first external heat exchange device 9, an inlet of the second external heat exchange device 27, the water inlet pipeline 5 and the second three-way valve 32, three ports of the first three-way valve 31 are respectively communicated with an outlet of the first external heat exchange device 9, the water outlet pipeline 14 and the second three-way valve 32, the second three-way valve 32 is further communicated with an outlet of the second external heat exchange device 27, that is, three ports of the second three-way valve 32 are respectively communicated with an outlet of the second external heat exchange device 27. The first four-way valve 41, the first three-way valve 31 and the second three-way valve 32 have a plurality of working positions, respectively, and can be switched on or off at any one port or at least two ports.
What need to explain, the utility model provides an outside heat transfer device carries out the heat exchange with outside heat transfer source, and outside heat transfer source can provide heat or cold volume for the heat transfer working medium in the working medium circulation system, promptly, heat transfer working medium among the external circulation water route 101 can obtain cold volume in order to reduce the temperature (heat transfer working medium becomes the cooling working medium that the temperature reduces promptly) from the outside heat transfer source of relative microthermal, and heat transfer working medium among the external circulation water route 101 can obtain the heat in order to rise the temperature (heat transfer working medium becomes the heating working medium that the temperature risees promptly) from the outside heat transfer source of relative high temperature. Wherein, the external heat exchange source can provide heat or cold energy through a plurality of realization forms, mainly includes: (1) the external liquid heat exchange source provides heat or cold in a liquid and liquid heat exchange mode, for example, the liquid refrigerant working medium of a mechanical refrigeration system is used for providing heat or cold, or external natural water resources (seawater, river water and hot spring) are used for providing heat or cold; (2) and an external air heat exchange source for providing heat or cold in a heat exchange mode of air and liquid, for example, external natural air is used for providing heat or cold.
Preferably, the external heat exchange device in the present invention includes a liquid-liquid heat exchange device for exchanging heat with an external liquid heat exchange source and/or an air-liquid heat exchange device for exchanging heat with an external air heat exchange source. The liquid-liquid heat exchange device adopts a liquid-liquid heat exchange mode to carry out heat exchange, the heat exchange working medium flows through the inside of the liquid-liquid heat exchange device, and the external liquid heat exchange medium flows through the inside or the surface of the liquid-liquid heat exchange device. The air-liquid heat exchange device adopts a mode of exchanging heat between air and liquid, the heat exchange working medium flows through the inside of the air-liquid heat exchange device 9, and the outside air flows through the surface of the air-liquid heat exchange device.
The liquid-liquid heat exchange device can be any one of a plate heat exchanger, a shell and tube heat exchanger, a water bath type heat exchanger and the like; the air-liquid heat exchange device can be any one of a coil heat exchanger, a finned heat exchanger, a dry cooler and the like, for example, when the air-liquid heat exchange device is a common coil, the external natural air can be adopted to cool the heat exchange working medium in the pipeline, and an external air heat exchange source does not need to be arranged independently.
It should be noted that the water chilling unit provided by the present invention may or may not include an external heat exchanging source. Preferably, the water chilling unit provided by the present invention further includes an external liquid heat exchange source system for providing an external liquid heat exchange source, and the external liquid heat exchange source system exchanges heat with the external circulation water channel 101 through the liquid-liquid heat exchange device.
It should be noted that the external liquid heat exchange system may be implemented in various forms, such as a mechanical refrigeration system using a compressor for refrigeration, or a cooling tower, etc. Preferably, the external liquid heat exchanging system is a mechanical refrigeration system, as shown in fig. 1 and 7 to 9, the mechanical refrigeration system includes a compressor 16, a condenser 17, an electronic expansion valve 19 and a liquid-liquid heat exchanging device, which are circularly connected by a refrigerant circulating pipeline 23, and a refrigerant working medium circularly flows in the refrigerant circulating pipeline 23. The condenser 17 is further provided with a condensing fan 18 on one side thereof for heat dissipation of the condenser 17, and the condensing fan 18 may also serve as a heat dissipation fan of the second external heat exchange device 27, as shown in the arrangements of fig. 7 to 9.
In a preferred embodiment, the first external heat exchanger 9 in this embodiment is a liquid-liquid heat exchanger, the second external heat exchanger is an air-liquid heat exchanger, the chiller is further provided with a mechanical refrigeration system that performs heat exchange with the liquid-liquid heat exchanger, the external circulation water path 101 is provided with a first four-way valve 41, a first three-way valve 31, and a second three-way valve 32, and the connection relationship between each valve element and each external heat exchanger is as shown in fig. 7.
The working process of the water chilling unit with the two external heat exchange devices when the battery pack 1 of the energy storage system is in each working condition is as follows:
working condition 1: when the battery pack 1 is in a working condition without heating/refrigerating requirements, for example, the temperature of the battery pack 1 is 5-25 ℃ or the temperature of the heat exchange working medium is 10-15 ℃, at the moment, the water chilling unit starts self-circulation, namely, only the water pump 8 of the external circulation water channel 101 is started, the heat exchange working medium flows through each battery pack 1 and is used for balancing the temperature difference of each battery pack 1 of the energy storage system, and at the moment, a mechanical refrigerating system does not need to be started.
Working condition 2: the battery pack 1 has a heating requirement, for example, when the external environment temperature is less than or equal to 15 ℃ and the battery pack 1 has a heating requirement, the water chilling unit works in a heating mode, and at the moment, a mechanical refrigeration system with a heat pump function can be used for providing heat for the liquid-liquid heat exchange device, so that a heating function is realized.
Working condition 3: the battery pack 1 is in a low-power heating working condition, for example, when the external environment temperature is less than or equal to 15 ℃, the temperature of the battery pack 1 is greater than 25 ℃, and the battery pack 1 generates heat at low power or the temperature of the heat exchange working medium is less than 20 ℃, the water chiller works in a low-temperature energy-saving mode, as shown in fig. 7, the mechanical refrigeration system is not started, only the water pump 8 and the condensing fan 18 work, at this time, the second external heat exchange device 27 is used for heat dissipation, that is, the external natural air and the air-liquid heat exchange device are used for heat exchange, the working mode can be attached to the battery heating characteristic, so that the temperature of the heat exchange working medium changes slowly, and the impact of.
Working condition 4: the battery pack 1 is in a first high-power heating condition, for example: when the temperature of the external environment is less than or equal to 15 ℃, the temperature of the battery pack 1 is more than 25 ℃, and the temperature of the high-power heating or heat exchange working medium of the battery pack 1 is more than or equal to 20 ℃ (working condition 4 a); or when the external environment temperature is less than or equal to 15 ℃, the temperature of the battery pack 1 is more than 30 ℃, and the high-power heating or heat exchange working medium temperature of the battery pack 1 is more than or equal to 25 ℃ (working condition 4 b); at this time, the water chiller unit works in a low-temperature energy-saving refrigeration mode, as shown in fig. 8, the mechanical refrigeration system starts the refrigeration mode, the water pump 8 and the condensing fan 18 also start to work, the second external heat exchange device and the liquid-liquid heat exchange device are connected in series by using the first four-way valve 41, the first three-way valve 31 and the second three-way valve 32, so that two-stage cooling is realized, specifically, the second external heat exchange device 27 provides one-stage cooling, and the cold energy contained in the external natural air is fully utilized to take away a part of heat of the heat exchange working medium; the heat exchange between the liquid-liquid heat exchange device and the mechanical refrigerating system provides secondary cooling, namely, the refrigeration of the compressor provides supplementary cold energy, the refrigeration can be carried out in a low energy consumption mode (working condition 4a), the cold energy can also be provided to the maximum extent (working condition 4b), and the purpose of energy conservation is realized. When the second external heat exchange device 27 is used for providing primary cooling, an indirect evaporative cooling mode can be adopted, for example, when the second external heat exchange device 27 is a dry cooler, a spray device can be additionally arranged outside the dry cooler to realize further evaporative cooling.
Working condition 5: the battery pack 1 is in a second high-power heating working condition, for example, when the external environment temperature is greater than 15 ℃, the temperature of the battery pack 1 is greater than 30 ℃, the battery pack 1 generates heat with high power or the temperature of the heat exchange working medium is greater than or equal to 25 ℃, at this time, the external natural air cannot provide enough cold, the water chiller operates in a refrigeration mode, as shown in fig. 9, the first four-way valve 41 is no longer connected with the second external heat exchange device 27, the mechanical refrigeration system is started and operates in the refrigeration mode, the water pump 8 and the condensing fan 18 are also started and operate, and only the liquid-liquid heat exchange device is used for exchanging heat with the mechanical refrigeration system, so that the heat exchange working.
It should be noted that the above five working conditions and the specific temperatures thereof are only an example of the embodiment, and those skilled in the art may also determine the working temperatures of different working conditions of the battery pack 1 according to the battery heating characteristics of the energy storage system and the working conditions of the battery pack and determine the specific working mode of the water chilling unit, which is not described herein again.
Preferably, the water pump 8 in this embodiment is preferably an inverter water pump, and/or the compressor 16 is an inverter compressor, and/or the condensing fan 18 is an inverter condensing fan. So set up, this scheme can realize the refrigerated function of frequency conversion to further practice thrift the energy consumption. As shown in fig. 1, the water pump 8 is controlled by a water pump inverter controller 20, the compressor 16 is controlled by a compressor inverter controller 21, and the condensing fan 18 is controlled by a condensing fan inverter controller 22.
Of course, the present invention can also be provided with three or more external heat exchange devices in the water chiller, as shown in fig. 10, the external circulation water path 101 is provided with three external heat exchange devices, which are respectively the first external heat exchange device 9 (liquid-liquid heat exchange device), the second external heat exchange device 27 and the third external heat exchange device 28, the system can also be provided with a first external heat exchange source 51, a second external heat exchange source 52 and a third external heat exchange source 53 corresponding to the three external heat exchange devices one by one, the three external heat exchange sources can be designed as an external liquid heat exchange source system or an external air heat exchange source system, compared with the water chiller shown in fig. 1, the water chiller shown in fig. 10 is further provided with a first four-way valve 41, a second four-way valve 42, a third four-way valve 43, a first three-way valve 31 and a second three-way valve 32, and the connection relationship between each multi-way valve and other components is as, so as to realize the independent connection or the serial connection and the parallel connection of the three external heat exchange devices, and the specific implementation process is not repeated herein.
The utility model also provides an energy storage system including above-mentioned cooling water set. The energy storage system also has an energy storage system cabinet 200, the energy storage system cabinet 200 is preferably arranged with a plurality of battery packs 300, and each battery pack 300 is preferably arranged with a plurality of battery packs 1, as shown in fig. 2. The derivation process of the beneficial effects generated by the energy storage system is substantially similar to the derivation process of the beneficial effects brought by the water chilling unit, and therefore, the description is omitted here.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (14)
1. The utility model provides a water chilling unit, is applied to the energy storage system including group battery (1), its characterized in that, including working medium circulation system, working medium circulation system include external circulation water route (101) and be used for with internal circulation water route (201) of group battery (1) heat transfer, internal circulation water route (201) including be used for with liquid heat transfer device (2) that one side surface or the multiple side surface of group battery (1) carry out the heat transfer, external circulation water route (101) with internal circulation water route (201) form the closed circulation water route that supplies heat transfer working medium circulation to flow, external circulation water route (101) are equipped with the drive heat transfer working medium mobile water pump (8), external circulation water route (101) carry out the heat transfer through external heat transfer device with the external heat transfer source.
2. The water chilling unit according to claim 1, wherein the water chilling unit comprises at least two external heat exchange devices, and the external circulation water path (101) is communicated with any one of the external heat exchange devices independently or communicated with any more than two external heat exchange devices in parallel or in series through a multi-position multi-way valve.
3. Water chilling unit according to claim 2, characterized in that the external circulation water circuit (101) comprises a water inlet line (5), a water outlet line (14), a first external heat exchange means (9) and a second external heat exchange means (27), the multi-position multi-way valve comprises a first four-way valve (41), a first three-way valve (31) and a second three-way valve (32), the four ports of the first four-way valve (41) are respectively communicated with the inlet of the first external heat exchange device (9), the inlet of the second external heat exchange device (27), the water inlet pipeline (5) and the second three-way valve (32), three ports of the first three-way valve (31) are respectively communicated with an outlet of the first external heat exchange device (9), the water outlet pipeline (14) and the second three-way valve (32), the second three-way valve (32) is also in communication with the outlet of the second external heat exchange means (27).
4. The water chilling unit according to any one of claims 1 to 3, wherein the external heat exchange means comprises a liquid-liquid heat exchange means for exchanging heat with an external liquid heat exchange source and/or an air-liquid heat exchange means for exchanging heat with an external air heat exchange source.
5. The chiller according to claim 4 wherein said liquid-to-liquid heat exchange device is any one of a plate heat exchanger, a shell and tube heat exchanger and a water bath heat exchanger and said air-to-liquid heat exchange device is any one of a coil heat exchanger, a finned heat exchanger and a dry cooler.
6. The water chilling unit according to claim 4, further comprising an external liquid heat exchange source system for providing an external liquid heat exchange source, the external liquid heat exchange source system exchanging heat with the external circulation water path (101) through the liquid-liquid heat exchange device.
7. The water chilling unit according to claim 6, wherein the external liquid heat exchanging system is a mechanical refrigeration system, the mechanical refrigeration system comprises a compressor (16), a condenser (17), an electronic expansion valve (19) and the liquid-liquid heat exchanging device which are circularly connected by a refrigerant circulating pipeline (23), and a refrigerant medium circularly flows in the refrigerant circulating pipeline (23).
8. The water chilling unit according to claim 7, wherein the mechanical refrigeration system further comprises a condensing fan (18), the water pump (8) is an inverter water pump, and/or the compressor (16) is an inverter compressor, and/or the condensing fan (18) is an inverter condensing fan.
9. The water chilling unit according to claim 1, characterized in that the liquid heat exchange means (2) comprises a liquid heat exchange plate (25) laid under the battery pack (1);
and/or the liquid heat exchange device (2) comprises a liquid heat exchange water tank (26), and the battery pack (1) is immersed in a heat exchange working medium in the liquid heat exchange water tank (26).
10. Water chilling unit according to claim 1, characterized in that the water pump (8) is arranged between the inlet of the external circulation water circuit (101) and the external heat exchange device, and a filter (6) is arranged between the inlet of the external circulation water circuit (101) and the water pump (8).
11. The water chilling unit according to claim 10, wherein a buffer pipeline (7) is arranged between the filter (6) and the water pump (8) in the external circulation water channel (101), the buffer pipeline (7) is a three-way pipeline, a first end of the buffer pipeline (7) is communicated with an outlet of the filter (6), a second end of the buffer pipeline (7) is connected with an exhaust component and arranged upwards, and a third end of the buffer pipeline (7) is connected with an inlet of the water pump (8).
12. The water chilling unit according to claim 1, characterized in that the external circulation water channel (101) is provided with a buffer water tank (11), an air exhaust part and a safety valve (12) are connected to the upper end of the buffer water tank (11), a liquid storage box (13) for containing the heat exchange working medium is arranged on the outer side of the buffer water tank (11), and the safety valve (12) is connected to the liquid storage box (13) through an overflow pipeline (121).
13. The water chilling unit according to claim 1, characterized in that the water return and/or water inlet of the internal circulation water circuit (201) is provided with a temperature sensor (4) for detecting the temperature of the heat exchange working medium.
14. An energy storage system comprising a chiller as claimed in any one of claims 1 to 13.
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| CN202023198530.1U CN213636112U (en) | 2020-12-24 | 2020-12-24 | Water chilling unit and energy storage system |
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| CN202023198530.1U CN213636112U (en) | 2020-12-24 | 2020-12-24 | Water chilling unit and energy storage system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115995633A (en) * | 2023-03-22 | 2023-04-21 | 江苏精研科技股份有限公司 | Energy storage assembly and electric vehicle |
| WO2023082912A1 (en) * | 2021-11-11 | 2023-05-19 | 宁德时代新能源科技股份有限公司 | Energy storage device |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023082912A1 (en) * | 2021-11-11 | 2023-05-19 | 宁德时代新能源科技股份有限公司 | Energy storage device |
| CN115995633A (en) * | 2023-03-22 | 2023-04-21 | 江苏精研科技股份有限公司 | Energy storage assembly and electric vehicle |
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