Energy storage container cooling system

Abstract

The utility model provides an energy storage container cooling system. A cold storage tank is connected with the input end of a water supply circulating pump set through a refrigerant output pipeline and a first cold supply main valve; the output end of the water supply circulating pump set is connected with the refrigerant input end of the compressor set and the refrigerant input end of the plate heat exchanger. A cooling liquid output end of the compressor unit is connected with an input end of a condenser in the cooling tower; a refrigerant output end of the compressor unit and a refrigerant output end of the plate heat exchanger are respectively connected with a refrigerant input pipeline of the cold storage tank through a second cold supply main valve; the output end of the cooling tower internal condenser is connected with the input end of the cooling water circulating pump set, and the output end of the cooling water circulating pump set is connected with the cooling liquid input end of the plate heat exchanger and the cooling liquid input end of the compressor set through the blow-down valve. The energy storage equipment cooling device can effectively cool the energy storage equipment, guarantees the cooling effect on the energy storage equipment, and enables the energy storage equipment to operate stably.

Description

Technical Field

[0001] The utility model belongs to the technical field of energy storage equipment cooling, and in particular relates to an energy storage container cooling system. Background Art

[0002] Energy storage containers are integrated energy storage systems that incorporate components such as battery cabinets, a lithium battery management system (BMS), and a containerized energy monitoring system. Energy storage inverters and energy management systems can also be integrated according to customer needs. This system offers simplified infrastructure construction costs, a short construction period, a high degree of modularity, and ease of transportation and installation, making it suitable for a variety of applications, including thermal, wind, and solar power plants, as well as factories and large load centers.

[0003] The design of an energy storage container is primarily divided into two major components: a battery compartment and an equipment warehouse. The battery compartment primarily includes batteries, battery racks, a BMS control cabinet, a fire extinguisher, a heat sink, smoke lighting, and surveillance cameras, used to store and manage electrical energy. Energy storage containers primarily utilize technologies such as chemical batteries or supercapacitors to provide energy regulation and balancing. Furthermore, energy storage containers can be used to collect and store new green energy sources for electricity conversion, as well as for emergency energy reserves to meet short-term power needs of critical facilities and adjust load curves in seasonal regions.

[0004] To ensure stable operation of energy storage containers, they must maintain good heat dissipation during operation, ensuring they operate within a reasonable temperature range. Continuously operating at excessively high temperatures can cause malfunctions such as cable short circuits and battery overheating, which can even lead to fires. Ensuring that energy storage containers operate within this reasonable temperature range is a pressing issue. Utility Model Content

[0005] The utility model provides an energy storage container cooling system, which can cool the energy storage equipment. The cooling effect meets the use requirements of the energy storage equipment and can improve the energy efficiency ratio of the system.

[0006] The energy storage container cooling system includes: cold storage tank, first cooling main valve, second cooling main valve, water supply circulation pump unit, compressor unit, plate heat exchanger, cooling tower, cooling water circulation pump unit and sewage valve;

[0007] The cold storage tank is provided with a refrigerant output pipeline and a refrigerant input pipeline;

[0008] The cold storage tank is connected to the input end of the water supply circulation pump group through the refrigerant output pipeline and the first cooling main valve;

[0009] The output end of the water supply circulation pump group is connected to the refrigerant input end of the compressor group and the refrigerant input end of the plate heat exchanger respectively; the coolant output end of the compressor group is connected to the input end of the condenser inside the cooling tower;

[0010] The refrigerant output end of the compressor unit and the refrigerant output end of the plate heat exchanger are respectively connected to the refrigerant input pipeline of the cold storage tank through the second cooling main valve;

[0011] The output end of the condenser inside the cooling tower is connected to the input end of the cooling water circulation pump group, and the output end of the cooling water circulation pump group is connected to the coolant input end of the plate heat exchanger and the coolant input end of the compressor group through the sewage valve;

[0012] The cooling tower is provided with an energy storage coolant input pipeline and an energy storage coolant output pipeline.

[0013] It should be further explained that a breathing valve and an explosion-proof valve are provided on the top of the cold storage tank;

[0014] A liquid replenishment tank and an overflow pipe are provided on the side wall of the cold storage tank near the top;

[0015] The refrigerant output pipeline and the refrigerant input pipeline are respectively installed on the side walls of the cold storage tank.

[0016] It should be further explained that the top of the cold storage tank is an arch, a fence is installed on the outside of the top of the cold storage tank, and a ladder is installed on the side wall;

[0017] Liquid level sensor and temperature sensor are installed on the side wall of the cold storage tank;

[0018] A manhole and a drain pipe are installed on the side wall near the bottom of the cold storage tank.

[0019] It should be further explained that the water supply circulation pump group is provided with at least three water supply circulation pumps, and the three water supply circulation pumps are connected in parallel.

[0020] It should be further explained that the cooling water circulation pump group is provided with at least three cooling water circulation pumps, and the at least three cooling water circulation pumps are connected in parallel.

[0021] It should be further explained that the compressor unit includes two scwe250m compressors, and the two scwe250m compressors are arranged in parallel.

[0022] It should be further explained that the cooling tower adopts at least one cross-flow cooling tower.

[0023] It should be further explained that a Y-type filter element is installed on the pipeline at the output end of the water supply circulation pump group and the pipeline at the input end of the cooling water circulation pump group.

[0024] It can be seen from the above technical solutions that the present invention has the following advantages:

[0025] The energy storage container cooling system provided by this utility model includes: a cold storage tank, a first main cold supply valve, a second main cold supply valve, a water supply circulation pump unit, a compressor unit, a plate heat exchanger, a cooling tower, a cooling water circulation pump unit, and a sewage valve. This system can heat exchange the coolant after heat exchange with the energy storage device, ensuring that the energy storage device operates within a reasonable temperature range. This prevents the energy storage device from continuously operating at excessively high temperatures, thereby eliminating cable short circuits, battery overheating, and fires.

[0026] Multiple compressors can meet the total cooling capacity of the system, enabling variable-frequency adjustment of the cooling power and energy conservation and consumption reduction. The compressors are redundant and non-interlocking. Both the water supply and cooling water circulation pumps are configured as standby units, ensuring stable system operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for the description. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 This is a schematic diagram of the energy storage container cooling system;

[0029] Figure 2 Schematic diagram of the cold storage tank. DETAILED DESCRIPTION

[0030] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings in the specific embodiments. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this patent.

[0031] like Figure 1 and Figure 2As shown, the energy storage container cooling system provided by the present invention includes: a cold storage tank 1, a first cooling main valve 2, a second cooling main valve 3, a water supply circulation pump group 4, a compressor group 5, a plate heat exchanger 6, a cooling tower 7, a cooling water circulation pump group 8 and a sewage valve 9; the cold storage tank 1 is provided with a refrigerant output pipeline and a refrigerant input pipeline; the cooling tower 7 is provided with an energy storage coolant input pipeline and an energy storage coolant output pipeline. The cold storage tank 1 is a tank body for storing and providing coolant. A condenser is provided inside the cooling tower 7. The liquid used to cool the energy storage device flows into the cooling tower 7 and exchanges heat through the condenser to cool the liquid, which is then circulated to the energy storage device for cooling. The energy storage device can be an energy storage container or an energy storage station with multiple batteries.

[0032] Cold storage tank 1 is connected to the input of water supply circulation pump unit 4 via a refrigerant output pipeline and a first cooling main valve 2. The output of water supply circulation pump unit 4 is connected to the refrigerant input of compressor unit 5 and plate heat exchanger 6, respectively. The coolant output of compressor unit 5 is connected to the input of the condenser inside cooling tower 7. The refrigerant output of compressor unit 5 and the refrigerant output of plate heat exchanger 6 are each connected to the refrigerant input pipeline of cold storage tank 1 via a second cooling main valve 3. The output of the condenser inside cooling tower 7 is connected to the input of cooling water circulation pump unit 8, which is connected to the coolant input of plate heat exchanger 6 and the coolant input of compressor unit 5 via a drain valve 9. Y-type filter elements 10 are installed on the output pipeline of water supply circulation pump unit 4 and the input pipeline of cooling water circulation pump unit 8.

[0033] The cold storage tank 1, the first cooling main valve 2, the second cooling main valve 3, the water supply circulation pump group 4, the compressor group 5, the plate heat exchanger 6, the cooling tower 7, the cooling water circulation pump group 8 and the sewage valve 9 in the utility model can be connected by pipelines. According to actual needs, flow meters, temperature sensors, flow valves, etc. can be installed on the pipelines.

[0034] The cold storage tank 1 of this utility model is equipped with a breathing valve and an explosion-proof valve on its top. A liquid replenishment tank 11 and an overflow pipe 12 are installed near the top of the side wall of the cold storage tank 1. The refrigerant output and input pipes are installed on the side walls of the cold storage tank 1. The top of the cold storage tank 1 is a dome 13, and a fence 14 is installed around the top of the cold storage tank 1. A ladder 15 is installed on the side wall. A liquid level sensor and a temperature sensor are installed on the side wall of the cold storage tank 1. A manhole 16 and a drain pipe 17 are installed on the side wall near the bottom of the cold storage tank 1.

[0035] For example, the cold storage tank 1 needs to store enough refrigerant to last for two hours of charging or discharging. The total cold storage capacity is 4830kw×2=9660kw. The refrigerant temperature range is 7℃-19℃, with a temperature difference of 12℃. The storage capacity of the cold storage tank 1 is 9660÷12÷1.163=692m3 / h. Considering a safety factor of 1.2, 692m3 / h is used. 3 ×1.2=830.4m 3 Considering the space limitation of the project site, the maximum allowed diameter of the cold storage tank is 11m.

[0036] The compressor unit 5 in the present invention includes two scwe250m compressors, which are arranged in parallel. The present invention also selects two Midea brand 250RT screw chillers to be used in conjunction with the two scwe250m compressors.

[0037] The main parameters are as follows:

[0038]

[0039] The cooling tower 7 of the present invention utilizes at least one cross-flow cooling tower 7. The operating principle of the cooling tower 7 is as follows: dry (low enthalpy) air, driven by a fan, enters the cooling tower 7 through a water-spraying packing; hot, humid (high enthalpy) water is sprayed onto the water-spraying packing via a water-spraying system. When the water and air come into contact, heat transfer occurs directly between the air and water, and due to the pressure difference between the surface of the water vapor molecules and the air, evaporation occurs under the action of this pressure difference, removing heat from the water as latent heat of evaporation. This evaporative heat transfer process achieves cooling.

[0040] For every 1°C increase in condensing temperature, the power consumption per unit of cooling capacity increases by approximately 2% to 3%. Therefore, lowering the supply and return water temperature of the cooling system to achieve efficient cooling can significantly improve the COP value of the chiller. The following measures should be taken:

[0041] This utility model can improve the heat release coefficient on the cooling water side of the condenser: an effective way to improve the heat release coefficient is to reduce the thermal resistance of dirt on the water side and effectively treat the cooling water replenishment. Designed based on a 28°C wet-bulb temperature and a temperature difference of 5°C, with a certain amount of redundancy factor, the heat exchange area of ​​the packing and the windward area can be increased.

[0042] In the cross-flow cooling tower 7 involved in the present invention, hot water enters the water tank through the water inlet pipe and is evenly distributed to the water troughs through the water tank. The water troughs are all equipped with gravity water heads. Hot water flows downward from the water heads and is evenly distributed through the fixed water distribution device at the lower end of the water heads, which can ensure that the hot water is evenly distributed in the filler. The hot water slowly falls downward in the filler due to its own gravity; the fan is driven by a motor to draw air so that the cold air passes through the heat dissipation material horizontally, so that the cold air and the hot water form a mutually vertical staggered form for heat exchange.

[0043] In this utility model, according to the refrigeration host selection table, the following is determined: the condenser water flow rate is 177.2m3 / h, the condenser water inlet temperature is 32℃, the water outlet temperature is 37℃, and the wet bulb temperature in Laiwu is 28℃. The water flow rate of cooling tower 7 is selected according to the host water flow rate * 1.1 coefficient, which is 177.2m3 / h × 1.1 = 194.92m3 / h. Taking all the above factors into consideration and considering a certain margin, two Yuanheng brand, model YHW-2201PY square cross-flow low-noise cooling towers 7 are selected and connected in parallel, with a water treatment capacity of 203m3 / h and a power of 7.5KW / unit. The total power of cooling tower 7 is 15kW.

[0044] The water supply circulation pump group 4 of the present invention is provided with at least three water supply circulation pumps, which are connected in parallel. The cooling water circulation pump group 8 is provided with at least three cooling water circulation pumps, which are connected in parallel.

[0045] The selection of the water supply circulation pump group 4 and the cooling water circulation pump group 8 involved in this utility model can be carried out by performing hydraulic calculations on the most unfavorable circuit within the system to determine the internal resistance, thereby making a fine selection of the pump head. The resistance is mainly determined by the chiller, the resistance along the way, and the local resistance. At the same time, the pressure drop of the main engine, the redundancy factor, the pressure drop of the cooling tower 7, the pressure drop of the cold storage tank 1, the pressure drop of the plate heat exchanger 6, and the pressure drop of the liquid cooling thermal management system are taken into consideration. Therefore, the pump head is determined as follows:

[0046] The calculation method for the head of cooling water circulation pump group 8 is:

[0047]

[0048] The calculation method for the lift of water supply circulation pump group 4 is:

[0049]

[0050] In the present invention, the plate heat exchanger 6 is used as a secondary heat exchange method, and its cooling medium is pure water plus ethylene glycol. The ethylene glycol aqueous solution circulates to continuously remove the heat during the charging and discharging process of the energy storage device, thereby ensuring that the operating temperature of the energy storage device is within a reasonable range.

[0051] The utility model can dissipate heat from the energy storage device based on a coolant with constant pressure and flow rate. The control method of the utility model can meet the heat dissipation requirements of the energy storage device through PLC control, achieving the purpose of accurately controlling the cooling temperature.

[0052] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," "the other end," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0053] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc., should be understood in a broad sense. For example, "connected" may refer to a fixed connection, a detachable connection, or an integral connection; it may refer to a mechanical connection or an electrical connection; it may refer to a direct connection or an indirect connection through an intermediate medium; it may refer to internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0054] The terms "first," "second," "third," "fourth," and so on (if any) in the description and claims of the present invention and the drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0055] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An energy storage container cooling system, characterized in that: include: Cold storage tank, first cooling main valve, second cooling main valve, water supply circulation pump unit, compressor unit, plate heat exchanger, cooling tower, cooling water circulation pump unit and sewage valve; The cold storage tank is provided with a refrigerant output pipeline and a refrigerant input pipeline; The cold storage tank is connected to the input end of the water supply circulation pump group through the refrigerant output pipeline and the first cooling main valve; The output end of the water supply circulation pump group is connected to the refrigerant input end of the compressor group and the refrigerant input end of the plate heat exchanger respectively; the coolant output end of the compressor group is connected to the input end of the condenser inside the cooling tower; The refrigerant output end of the compressor unit and the refrigerant output end of the plate heat exchanger are respectively connected to the refrigerant input pipeline of the cold storage tank through the second cooling main valve; The output end of the condenser inside the cooling tower is connected to the input end of the cooling water circulation pump group, and the output end of the cooling water circulation pump group is connected to the coolant input end of the plate heat exchanger and the coolant input end of the compressor group through the sewage valve; The cooling tower is provided with an energy storage coolant input pipeline and an energy storage coolant output pipeline.

2. The energy storage container cooling system according to claim 1, characterized in that: A breathing valve and an explosion-proof valve are installed on the top of the cold storage tank; A liquid replenishment tank and an overflow pipe are provided on the side wall of the cold storage tank near the top; The refrigerant output pipeline and the refrigerant input pipeline are respectively installed on the side walls of the cold storage tank.

3. The energy storage container cooling system according to claim 1 or 2, characterized in that: The top of the cold storage tank is an arch, with a fence installed around the top and a ladder installed on the side wall; Liquid level sensor and temperature sensor are installed on the side wall of the cold storage tank; A manhole and a drain pipe are installed on the side wall near the bottom of the cold storage tank.

4. The energy storage container cooling system according to claim 1 or 2, characterized in that: The water supply circulation pump group is provided with at least three water supply circulation pumps, and the three water supply circulation pumps are connected in parallel.

5. The energy storage container cooling system according to claim 1 or 2, characterized in that: The cooling water circulation pump group is provided with at least three cooling water circulation pumps, and the at least three cooling water circulation pumps are connected in parallel.

6. The energy storage container cooling system according to claim 1 or 2, characterized in that: The compressor unit includes two scwe250m compressors, and the two scwe250m compressors are set in parallel.

7. The energy storage container cooling system according to claim 1 or 2, characterized in that: The cooling tower adopts at least one cross-flow cooling tower.

8. The energy storage container cooling system according to claim 1 or 2, characterized in that: Y-type filter elements are respectively installed on the pipeline at the output end of the water supply circulation pump group and the pipeline at the input end of the cooling water circulation pump group.

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