Integrated cooling and insulation system for container energy storage

Abstract

The present invention discloses an integrated cooling and heat-insulating system for container energy storage, comprising: a water tank; a main circulation loop, the main circulation water circuit is connected to the water tank, the main circulation loop comprises a refrigeration system and an inner circulation water circuit, the refrigeration system and the inner circulation water circuit are connected, and can ensure the liquid supply temperature in the water tank; a secondary circulation loop, the secondary circulation loop is connected to the water tank, the secondary circulation loop comprises a first cooling branch and a second cooling branch, one end of the first cooling branch is connected to the water tank, and the other end of the first cooling branch is connected to a battery to take away the heat dissipated by the battery; one end of the second cooling branch is connected to the water tank, and the other end of the second cooling branch is connected to a heat exchanger, the heat exchanger is located in the container to ensure that the battery compartment and the equipment compartment in the container are kept at a constant temperature, the refrigeration system and the heat exchanger can be combined to use a set of system to cool down the internal environment of the container and the battery pack at the same time, which can not only reduce energy consumption but also save costs for enterprises.

Description

Technical Field

[0001] The present invention relates to the field of battery compartment cooling systems, and in particular to an integrated cooling and heat preservation system for container energy storage. Background Art

[0002] The container energy storage system (CESS) is an integrated energy storage system developed to meet the needs of the mobile energy storage market. It integrates battery cabinets, lithium battery management systems (BMS), container dynamic environment monitoring systems, and can integrate energy storage converters and energy management systems according to customer needs. The container energy storage system has the characteristics of simplified infrastructure construction costs, short construction period, high degree of modularization, easy transportation and installation, etc. It can be applied to power stations such as thermal power, wind power, solar power, or islands, communities, schools, scientific research institutions, factories, large load centers and other applications.

[0003] Lithium battery energy storage power station container, the most common is the chemical energy storage power station container, through the lithium battery charging and discharging operations, it plays the role of peak shaving and valley filling, improving the quality of electricity, acting as a backup power source, adjusting frequency and participating in the construction of smart grids.

[0004] Each "energy storage battery warehouse" is like a container, which can store electricity during low and normal periods of electricity consumption for use during peak periods. Each "container" can store 2,000 to 3,000 kWh of electricity at a time. After these 2,000 to 3,000 kWh of electricity are discharged and used during peak periods of electricity consumption, it can save 2,000 to 3,000 yuan.

[0005] In order to ensure constant temperature inside, existing energy storage containers generally use two independent systems: a refrigeration system and an air-conditioning fan. The refrigeration system is used to cool the battery pack, and the air-conditioning fan is used to cool the container. Two sets of system equipment are used at the same time.

[0006] The above solution not only increases the transport power and energy consumption, but is also not conducive to the integrated control of constant temperature in the container. Therefore, it is necessary to provide an integrated system to cool the battery pack and the container at the same time, which can not only reduce energy consumption but also facilitate integrated management. Summary of the invention

[0007] In order to solve the above technical problems, the present invention provides an integrated cooling and insulation system for container energy storage, which can combine the refrigeration system and the heat exchanger to use one system to cool the internal environment and battery pack of the container at the same time, which can not only reduce energy consumption but also save costs for enterprises.

[0008] The technical solution of the present invention is: an integrated cooling and heat preservation system for container energy storage, comprising:

[0009] Water tank;

[0010] A main circulation loop, the main circulation water circuit is connected to the water tank, the main circulation loop includes a refrigeration system and an internal circulation water circuit, the refrigeration system and the internal circulation water circuit are connected and can ensure the liquid supply temperature in the water tank;

[0011] A secondary circulation loop, the secondary circulation loop is connected to the water tank, the secondary circulation loop comprises a first cooling branch and a second cooling branch, one end of the first cooling branch is connected to the water tank, and a battery is installed in the first cooling branch to take away the heat dissipated by the battery;

[0012] One end of the second cooling branch is connected to the water tank. The second cooling branch is equipped with a heat exchanger. The heat exchanger is located in the container to ensure constant temperature of the battery compartment and the equipment compartment in the container.

[0013] Furthermore, the refrigeration system includes a compressor, a condenser and a plate heat exchanger, one end of the compressor is connected to the condenser, and the other end of the compressor is connected to the plate heat exchanger. A liquid storage tank, a drying filter, a sight glass and an expansion valve are also provided between the condenser and the plate heat exchanger.

[0014] Furthermore, the refrigeration system is provided with two groups, and the two groups of refrigeration systems are connected in parallel to the internal circulation water circuit.

[0015] Furthermore, the internal circulation water circuit includes an internal circulation pump, an electric three-way valve and an economizer, and the electric three-way valve is respectively connected to the internal circulation pump, the refrigeration system and the economizer, and a first ball valve is provided between the electric three-way valve and the economizer.

[0016] Furthermore, the water tank is provided with a first external circulation pump and a second external circulation pump, the first external circulation pump is connected to the first cooling branch, and the second external circulation pump is connected to the second cooling branch.

[0017] Furthermore, the first cooling branch includes a filter and a second ball valve connected to the filter, the filter is connected to the first external circulation pump, the second ball valve is connected to one end of the battery, and the other end of the battery is connected to the water tank through a third ball valve and a flow sensor.

[0018] Furthermore, the second cooling branch includes a filter and a fourth ball valve connected to the filter, one end of the filter is connected to the second external circulation pump, the fourth ball valve is connected to one end of the heat exchanger, and the other end of the heat exchanger is connected to the water tank through a fifth ball valve and a flow sensor.

[0019] Furthermore, the first cooling branch and the second cooling branch are respectively connected in series to the water tank.

[0020] Furthermore, the refrigeration system can be controlled individually.

[0021] Furthermore, a heating rod is also provided in the water tank.

[0022] The beneficial technical effects of the present invention are:

[0023] 1. The existing cooling equipment only combines the refrigeration system and the air conditioning fan. The refrigeration system is used to cool the battery pack, and the air conditioning fan is used to cool the container. This means that two sets of system equipment are used at the same time. The water cooling equipment designed in this paper combines the refrigeration system and the heat exchanger to use one system to cool the internal temperature of the container and the battery pack at the same time. Compared with the existing cooling equipment, it is more energy-efficient in terms of energy consumption, saving costs for the enterprise.

[0024] In addition, a system is used to simultaneously achieve internal temperature control of the container and cooling of the battery pack, making the system more intelligent and integrated, and convenient for personnel monitoring and maintenance.

[0025] 2. The refrigeration system of this water cooling equipment is combined with an economizer. In the transition season, the outdoor ambient temperature can be used to lower the temperature of the coolant, thereby cooling the battery pack. Therefore, the refrigeration system does not need to be turned on in the transition season, which can achieve the purpose of energy saving.

[0026] 3. In winter, the temperature of the coolant discharged by the second external circulation pump is higher than the surface temperature of the equipment compartment and the battery compartment. The coolant discharged by the second external circulation pump raises the surface temperature of the equipment compartment and the battery compartment to a certain temperature through the heat exchanger, so that the battery reaches a working environment.

[0027] 4. The refrigeration system can be controlled individually, which is convenient for switching during transitional seasons, and the economizer can be used for cooling to achieve energy saving.

[0028] 5. The battery compartment and equipment compartment are located in the container. There are multiple groups of batteries in the battery compartment. This setting can achieve the effect of advance energy storage and is convenient for personnel to use.

[0029] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0031] The accompanying drawings are marked as follows:

[0032] 1. Water tank; 2. Refrigeration system; 3. Internal circulation water circuit; 4. Electric three-way valve; 5. Plate heat exchanger; 6. Economizer; 7. Heat exchanger; 8. Battery; 9. Second cooling branch; 10. Second external circulation pump; 11. First cooling branch; 12. First external circulation pump; 13. Internal circulation pump; 14. First ball valve; 15. Second ball valve; 16. Fourth ball valve; 17. Third ball valve; 18. Fifth ball valve; 19. Compressor; 20. Condenser; 21. Liquid storage tank; 22. Dry filter; 23. Sight glass; 24. Flow sensor; 25. Expansion valve. DETAILED DESCRIPTION

[0033] In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the specific implementation methods of the present invention are further described in detail below in conjunction with the drawings and examples. The following examples are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0034] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so as to describe the embodiments of the present application described herein.

[0035] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships described in the embodiments and shown in the accompanying drawings, or are directions or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0036] like Figure 1 As shown, the present invention specifically relates to an integrated cooling and heat preservation system for container energy storage, comprising:

[0037] Water tank 1;

[0038] A main circulation loop, wherein the main circulation water circuit is connected to the water tank 1, and the main circulation loop comprises a refrigeration system 2 and an internal circulation water circuit 3, wherein the refrigeration system 2 and the internal circulation water circuit 3 are connected and can ensure the liquid supply temperature in the water tank 1;

[0039] A secondary circulation loop, the secondary circulation loop is connected to the water tank 1, the secondary circulation loop comprises a first cooling branch 11 and a second cooling branch 9, one end of the first cooling branch 11 is connected to the water tank 1, and a battery 8 is installed in the first cooling branch 11 to take away the heat dissipated by the battery 8;

[0040] One end of the second cooling branch 9 is connected to the water tank 1. The second cooling branch 9 is equipped with a heat exchanger 7. The heat exchanger 7 is located in the container to ensure constant temperature of the battery 8 compartment and the equipment compartment in the container.

[0041] Among them, the first cooling branch 11 is used to cool the battery 8 in the battery compartment to take away the heat dissipated by the battery 8 when working; the second cooling branch 9 is used to cool the surface of the battery compartment and the surface of the equipment compartment to ensure that the ambient temperature of the battery 8 tends to be constant and to ensure a stable temperature environment.

[0042] It should be noted that the main circulation loop is connected to one end of the water tank 1. After the coolant after heat exchange in the water tank 1 flows into the main circulation loop, the coolant in the water tank 1 is cooled through the refrigeration circuit or the internal circulation water circuit 3 to ensure a constant temperature of the coolant.

[0043] In addition, the refrigeration circuit can be controlled independently, and the purpose of cooling the coolant in the water tank 1 can also be achieved by utilizing the outdoor ambient temperature only through the internal circulation water circuit 3.

[0044] Furthermore, the secondary circulation loop is mainly used to transport the cooled coolant in the water tank 1 to the battery 8 and the heat exchanger 7, to ensure that the temperature of the battery 8 compartment and the equipment compartment will not be too high during the operation of the battery 8, to ensure that the battery 8 can work normally, and at the same time always be in a constant temperature environment, thereby ensuring safety.

[0045] The refrigeration system 2 includes a compressor 19, a condenser 20 and a plate heat exchanger 5. One end of the compressor 19 is connected to the condenser 20, and the other end of the compressor 19 is connected to the plate heat exchanger 5. A liquid storage tank 21, a drying filter 22, a sight glass 23, and an expansion valve 25 are also provided between the condenser 20 and the plate heat exchanger 5.

[0046] It should be noted that the water tank 1, the compressor 19, the condenser 20, the liquid storage tank 21, the drying filter 22, the sight glass 23, the expansion valve 25 and the plate heat exchanger 5 form a loop to transfer the coolant with heat in the water tank 1 to the water tank 1 after heat exchange through the plate heat exchanger 5, so as to achieve the purpose of cooling.

[0047] The refrigeration system 2 is provided with two groups, and the two groups of refrigeration systems 2 are connected in parallel to the internal circulation water circuit 3. The cooling efficiency can be improved by providing two groups of refrigeration systems 2.

[0048] The internal circulation water circuit 3 includes an internal circulation pump 13, an electric three-way valve 4 and an economizer 6, and the electric three-way valve 4 is connected to the internal circulation pump 13, the refrigeration system 2 and the economizer 6 respectively, and a first ball valve 14 is provided between the electric three-way valve 4 and the economizer 6.

[0049] It should be noted that, the internal circulation pump 13 is in a normally open state, and the internal circulation water circuit 3 and the refrigeration system 2 can be connected through the electric three-way valve 4. When the electric three-way valve 4 is connected to the refrigeration system 2, the economizer 6 located in the internal circulation water circuit 3 does not work, and the coolant with heat in the water tank 1 enters the refrigeration system 2 through the electric three-way valve 4, the coolant is cooled by the refrigeration system 2, and then the cooled coolant is transported to the water tank 1.

[0050] When the electric three-way valve 4 is connected to the internal circulation water circuit 3, the refrigeration system 2 is closed, and the coolant with heat in the water tank 1 passes through the electric three-way valve 4 and the ball valve and enters the economizer 6. The coolant is cooled by the economizer 6 and the cooled coolant is transported to the water tank 1.

[0051] Under normal circumstances, only one output end of the electric three-way valve 4 will remain open, and the input end is always connected to the internal circulation pump 13 to transport the coolant in the water tank 1.

[0052] The water tank 1 is provided with a first external circulation pump 12 and a second external circulation pump 10 . The first external circulation pump 12 is connected to the first cooling branch 11 , and the second external circulation pump 10 is connected to the second cooling branch 9 .

[0053] Among them, the first cooling branch 11 and the second cooling branch 9 are both capable of transporting the coolant in the water tank 1 to the equipment end and cooling the equipment end. The coolant after heat exchange then returns to the water tank 1 for heat exchange through the first cooling branch 11 and the second cooling branch 9 respectively.

[0054] The first cooling branch 11 includes a filter and a second ball valve 15 connected to the filter, the filter is connected to the first external circulation pump 12, the second ball valve 15 is connected to one end of the battery 8, and the other end of the battery 8 is connected to the water tank 1 through a third ball valve 17 and a flow sensor 24.

[0055] The second cooling branch 9 includes a filter and a fourth ball valve 16 connected to the filter, one end of the filter is connected to the second external circulation pump 10, the fourth ball valve 16 is connected to one end of the heat exchanger 7, and the other end of the heat exchanger 7 is connected to the water tank 1 through a fifth ball valve 18 and a flow sensor 24.

[0056] In addition, a temperature sensor (not shown in the figure) and a liquid level sensor (not shown in the figure) are also provided in the water tank 1 , and the temperature in the water tank 1 is monitored by the temperature sensor.

[0057] In summer, when the ambient temperature is 40-50℃, the temperature of the coolant in the water tank 1 is higher than the set temperature, and the internal circulation pump 13 connected to the water tank 1 is turned on. At this time, the electric three-way valve 4 is connected to the refrigeration system 2, and the compressor 19 compresses the low-temperature and low-pressure refrigerant gas into a high-temperature and high-pressure gas, which then enters the condenser 20. The condenser 20 condenses the refrigerant into a low-temperature and high-pressure liquid, which is then throttled to a low-temperature and low-pressure refrigerant liquid through the expansion valve 25 and flows into the plate heat exchanger 5. In the plate heat exchanger 5, it exchanges heat with the coolant discharged by the internal circulation pump 13. The refrigerant evaporates into a low-temperature and low-pressure gas and is sucked into the compressor 19. The coolant is cooled and returns to the water tank 1, thus completing a cycle.

[0058] The first external circulation pump 12 is connected to the battery 8 in the container. When the battery 8 is charging, it will dissipate a lot of heat. At this time, the first external circulation pump 12 is started, and the cooled coolant flows into the battery 8 through the pipeline to exchange heat with the battery 8, thereby taking away the heat dissipated by the battery 8, and the heated coolant returns to the water tank 1.

[0059] The second external circulation pump 10 is connected to the heat exchanger 7 in the container. The heat exchanger 7 is located in the battery compartment 8 and the equipment compartment of the container. The purpose of the heat exchanger 7 is to cool the equipment compartment and the battery compartment 8 to keep them at a stable temperature. In summer, the temperature of the coolant discharged by the second external circulation pump 10 is lower than the temperature of the equipment compartment and the battery compartment 8. The temperature of the equipment compartment and the battery compartment 8 is reduced to a certain temperature through the heat exchanger 7, and the heated coolant returns to the water tank 1.

[0060] In spring and autumn, when the ambient temperature is around 15°C, the refrigeration system 2 is turned off and the internal circulation pump 13 connected to the water tank 1 is turned on. At this time, the electric three-way valve 4 is connected to the economizer 6. The function of the economizer 6 is: when the ambient temperature is relatively low during the transition season, the natural wind directly blows to the economizer 6 to cool the coolant and return it to the water tank 1.

[0061] The first external circulation pump 12 is connected to the battery 8 in the container. When the battery 8 is charging, it will dissipate a lot of heat. At this time, the first external circulation pump 12 is started, and the cooled coolant flows into the battery 8 through the pipeline to exchange heat with the battery 8, thereby taking away the heat dissipated by the battery 8, and the heated coolant returns to the water tank 1.

[0062] The second external circulation pump 10 is connected to the heat exchanger 7 in the container. The heat exchanger 7 is located in the battery compartment 8 and the equipment compartment of the container. The purpose of the heat exchanger 7 is to keep the equipment compartment and the battery compartment 8 at a stable temperature. The temperature of the coolant discharged by the second external circulation pump 10 is higher than the temperature of the equipment compartment and the battery compartment 8. The temperature of the equipment compartment and the battery compartment 8 is raised to a certain temperature through the heat exchanger 7, and the cooled coolant returns to the water tank 1.

[0063] In winter, when the ambient temperature is less than or equal to 0°C, the refrigeration system 2 is turned off. At this time, the temperature of the coolant in the water tank 1 is lower than the set temperature, and the coolant in the water tank 1 is maintained at the set temperature by the heating rod in the water tank 1.

[0064] The first external circulation pump 12 is connected to the battery 8 in the container. The temperature of the battery 8 is lower than the temperature of the water tank. At this time, the first external circulation pump 12 is started, and the heated coolant flows into the battery 8 through the pipeline, exchanges heat with the battery 8, thereby heating the battery 8 to keep it at the set temperature of the water tank, and the cooled coolant returns to the water tank 1.

[0065] The second external circulation pump 10 is connected to the heat exchanger 7 in the container. The heat exchanger 7 is located in the battery compartment 8 and the equipment compartment of the container. The purpose of the heat exchanger 7 is to heat the equipment compartment and the battery compartment 8 to keep them at a stable temperature. In winter, the temperature of the coolant discharged by the second external circulation pump 10 is higher than the temperature of the equipment compartment and the battery compartment 8. The temperature of the equipment compartment and the battery compartment 8 is raised to a certain temperature through the heat exchanger 7, and the cooled coolant returns to the water tank 1.

[0066] When the temperature of the coolant in the water tank 1 is higher than the set temperature, the heating rod is stopped, the internal circulation pump 13 is turned on, the electric three-way valve 4 is connected to the internal circulation water circuit 3, the refrigeration system 2 is turned off, and the coolant with heat in the water tank 1 passes through the electric three-way valve 4 and the first ball valve 14 and enters the economizer 6, the coolant is cooled by the economizer 6, and the cooled coolant is transported to the water tank 1.

[0067] The heat exchanger 7 is equipped with a fan, which blows the temperature of the coolant to the surface of the battery compartment and the equipment compartment. Since the temperature of the coolant is higher than the surface of the battery compartment and the equipment compartment in winter, the fan blows out hot air to heat the battery compartment and the equipment compartment.

[0068] The first cooling branch 11 and the second cooling branch 9 are respectively connected in series to the water tank 1 .

[0069] The above embodiments are only specific implementation methods of the present invention, which are used to illustrate the technical solutions of the present invention rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the aforementioned embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the protection scope of the present invention.

Claims

1. A cooling and heat preservation integrated system for container energy storage, characterized in that: include: Water tank (1); A main circulation loop, the main circulation loop being connected to the water tank (1), the main circulation loop comprising a refrigeration system (2) and an internal circulation water circuit (3), the refrigeration system (2) and the internal circulation water circuit (3) being in communication and capable of ensuring the liquid supply temperature in the water tank (1); a secondary circulation loop, the secondary circulation loop being in communication with the water tank (1), the secondary circulation loop comprising a first cooling branch (11) and a second cooling branch (9), one end of the first cooling branch (11) being in communication with the water tank (1), and a battery (8) being mounted on the first cooling branch (11) to carry away heat dissipated by the battery (8); One end of the second cooling branch (9) is in communication with the water tank (1); a heat exchanger (7) is installed on the second cooling branch (9); the heat exchanger (7) is located in the container to ensure that the battery compartment and the equipment compartment in the container are kept at a constant temperature; The refrigeration system (2) comprises a compressor (19), a condenser (20) and a plate heat exchanger (5); one end of the compressor (19) is connected to the condenser (20), and the other end of the compressor (19) is connected to the plate heat exchanger (5); a liquid storage tank (21), a drying filter (22), a sight glass (23), and an expansion valve (25) are also provided between the condenser (20) and the plate heat exchanger (5); The refrigeration system (2) is provided with two groups, and the two groups of the refrigeration system (2) are connected in parallel to the internal circulation water circuit (3) as a whole; The internal circulation water circuit (3) comprises an internal circulation pump (13), an electric three-way valve (4) and an economizer (6), and the electric three-way valve (4) is connected to the internal circulation pump (13), the refrigeration system (2) and the economizer (6) respectively, and a first ball valve (14) is provided between the electric three-way valve (4) and the economizer (6).

2. The integrated cooling and heat preservation system for container energy storage according to claim 1, characterized in that: The water tank (1) is provided with a first external circulation pump (12) and a second external circulation pump (10); the first external circulation pump (12) is connected to the first cooling branch (11), and the second external circulation pump (10) is connected to the second cooling branch (9).

3. The integrated cooling and heat preservation system for container energy storage according to claim 2, characterized in that: The first cooling branch (11) comprises a filter and a second ball valve (15) connected to the filter, the filter is connected to the first external circulation pump (12), the second ball valve (15) is connected to one end of the battery (8), and the other end of the battery (8) is connected to the water tank (1) through a third ball valve (17) and a flow sensor (24).

4. The integrated cooling and heat preservation system for container energy storage according to claim 2, characterized in that: The second cooling branch (9) comprises a filter and a fourth ball valve (16) connected to the filter, one end of the filter is connected to the second external circulation pump (10), the fourth ball valve (16) is connected to one end of the heat exchanger (7), and the other end of the heat exchanger (7) is connected to the water tank (1) via a fifth ball valve (18) and a flow sensor (24).

5. The integrated cooling and heat preservation system for container energy storage according to claim 4, characterized in that: The first cooling branch (11) and the second cooling branch (9) are respectively connected in series to the water tank (1).

6. The integrated cooling and heat preservation system for container energy storage according to claim 1, characterized in that: A heating rod is also provided in the water tank (1).

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