Efficient cold supplementing and heat exchanging system applied to vanadium battery system
By introducing evaporator and compressor systems into the vanadium battery system, a stable refrigeration cycle is formed, which solves the problem of unstable cooling output of the existing pump-driven refrigeration unit at low and high temperatures, and achieves high efficiency under different temperature conditions Cooling output.
Patent Information
- Application Number
- CN202420283670.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-06
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2034-02-06
AI Technical Summary
The existing pump-drive phase change refrigeration units cannot be suitable for low-temperature electrolyte systems and high ambient temperature project sites, resulting in unstable cooling output and irreversible damage to the battery system.
Introduce evaporator A and evaporator B in the vanadium battery system, and combine the compressor system to form a mixing mode and a natural cold source mode, use fluorine pumps and plate heat exchangers to form a refrigeration cycle, and use a compressor intervention to stabilize the cooling capacity Output.
It realizes stable cooling output at an electrolyte system of 35-40℃ and ambient temperature above 35℃, reduces power consumption, and ensures cooling output when the condenser is dirty and blocked, which is suitable for different temperature conditions.
Smart Images
Figure CN222143429U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of liquid flow batteries, and in particular relates to a high-efficiency cooling and heat exchange system applied to a vanadium battery system. Background Art
[0002] In the all-vanadium liquid flow battery system, the pump-driven phase change refrigeration unit is more efficient.
[0003] When the pump-driven phase change refrigeration unit is put into battery system cooling, the refrigerant flows into the evaporator driven by the shielded pump, and changes from a single phase to a vapor-liquid two-phase state after absorbing the heat of the electrolyte. The two-phase fluid flows into the condenser of the outdoor unit, and after natural cooling or forced air cooling by the fan, it changes from a vapor-liquid two-phase state to a liquid state, enters the refrigerant storage tank, and is then sucked in by the shielded pump and pumped into the evaporator, and so on and so forth to complete the refrigeration cycle.
[0004] Pump-driven phase change refrigeration units are greatly affected by electrolyte temperature and ambient temperature. They are not suitable for low-temperature electrolyte systems and project sites with high ambient temperatures. The cooling output is unstable, causing irreversible damage to the battery system.
[0005] The existing pump-driven phase change refrigeration units mainly have the following defects:
[0006] 1. It is not applicable to battery systems with 35-40℃ electrolyte system;
[0007] 2. It cannot be applied to project sites with ambient temperature above 35℃;
[0008] 3. The site environment requirements are high, and dirty and blocked fins have a great impact on the cooling output. Summary of the invention
[0009] In order to solve the above technical problems, the utility model connects evaporator A and evaporator B to the positive main line of the battery system. Evaporator A and evaporator B are both shell and tube evaporators. The electrolyte flows through the shell side, and the low-temperature refrigerant flows through the tube side. The refrigerant enters evaporator A and evaporator B from the fluorine pump, and then exits evaporator A and evaporator B to enter the outdoor condensing unit, flows through the plate heat exchanger, is cooled by the compressor cooling system in the plate heat exchanger, and then flows into the refrigerant storage tank, and finally is sucked in and pumped out to the shell and tube by the fluorine pump to form a closed loop of the refrigeration system.
[0010] This solution has two operating modes:
[0011] 1. Mixed mode, that is, compressor intervention. The low-temperature refrigerant flows into the shell and tube evaporator driven by the fluorine pump, and changes from a liquid single phase to a vapor-liquid two-phase state after absorbing the heat of the electrolyte. The two-phase fluid flows into the condenser of the outdoor unit, and changes from a vapor-liquid two-phase state after natural cooling or forced air cooling by the fan. The liquid refrigerant flows through the plate heat exchanger, and is cooled by the compressor cooling system as a to-be-cooled object, and then flows into the refrigerant storage tank, and is finally sucked in and pumped out to the shell and tube evaporator by the fluorine pump, and so on and so forth to complete the refrigeration cycle.
[0012] 2. Natural cooling source mode, that is, the compressor does not intervene, and the principle is the same as the pump-driven phase change refrigeration unit.
[0013] The technical solution of the utility model is as follows:
[0014] Evaporator A and evaporator B are shell and tube evaporators. The outdoor condenser includes a natural cold source condenser and a compressor condenser. The fluorine pump and the refrigerant storage tank are the same as the pump-driven phase change refrigeration unit. A compressor system, 2 expansion valves, 2 solenoid valves, and a plate heat exchanger are newly added.
[0015] A high-efficiency supplementary cooling and heat exchange system applied to a vanadium battery system is provided with a plate heat exchanger on the pipe between the outdoor condenser and the refrigerant storage tank, an expansion valve C is provided on the pipe from the outdoor condenser to the plate heat exchanger, a compressor is connected to the pipe from the plate heat exchanger to the outdoor condenser, a solenoid valve A is provided on the pipe between the outdoor condenser and the vanadium battery system, the pipe between the outdoor condenser and the vanadium battery system is connected to the pipe between the outdoor condenser and the plate heat exchanger, and a solenoid valve B is provided.
[0016] The outlet of the shielded pump is connected to the fluorine inlet copper tube of evaporator A and evaporator B respectively, and the fluorine outlet copper tubes of evaporator A and evaporator B are connected to the condenser. The condenser is connected to the refrigerant storage tank pipeline, and the refrigerant storage tank is connected to the inlet of the shielded pump through a copper tube, forming a closed loop of the refrigeration system.
[0017] The beneficial effects of the utility model compared with the prior art are:
[0018] The utility model can form two small circulation pipelines and can use two kinds of refrigerants;
[0019] 1. On the one hand, it is suitable for electrolyte systems with electrolyte temperatures of 35-40°C. When the ambient temperature is low, it can still only use pump-driven refrigeration, which consumes low power. When the ambient temperature is high, the compressor intervenes to provide cooling to ensure stable cooling output;
[0020] 2. On the other hand, it is suitable for project sites with ambient temperature above 35℃. The compressor is directly involved in cooling to ensure stable cooling output;
[0021] 3. Just clean the condenser fins properly. After the compressor is involved, the cooling output can still be guaranteed even if there is dirt and blockage, but the power consumption will be appropriately increased according to the degree of dirt and blockage. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] The utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0023] Figure 1 It is a schematic diagram of the structure of the utility model.
[0024] In the figure: 1. Natural cold source condenser, 2. Compressor condenser, 3. Compressor, 4. Plate heat exchanger, 5. Solenoid valve A, 6. Solenoid valve B, 7. Refrigerant storage tank, 8. Fluorine pump, 9. Expansion valve A, 10. Expansion valve B, 11. Expansion valve C, 12. Evaporator A, 13. Evaporator B, 14. Battery stack A, 15. Battery stack B, 16. Positive electrolyte tank A, 17. Negative electrolyte tank A, 18. Positive electrolyte tank B, 19. Negative electrolyte tank B. DETAILED DESCRIPTION
[0025] The present invention is described in detail below through specific examples, but the protection scope of the present invention is not limited. Unless otherwise specified, the experimental methods used in the present invention are all conventional methods, and the experimental equipment, materials, reagents, etc. used can be obtained from commercial channels.
[0026] Example 1
[0027] like Figure 1 As shown, evaporator A12 and evaporator B13 are shell and tube evaporators, the outdoor condenser includes a natural cold source condenser 1 and a compressor condenser 2, a fluorine pump 8, and a refrigerant storage tank 7. The principle of the pump-driven phase change refrigeration unit is the same, and a compressor system, two expansion valves, two solenoid valves, and a plate heat exchanger 4 are newly added.
[0028] A high-efficiency supplementary cooling and heat exchange system applied to a vanadium battery system, wherein a plate heat exchanger 4 is provided on the pipeline between an outdoor condenser and a refrigerant storage tank 7, an expansion valve C11 is provided on the pipeline from the outdoor condenser to the plate heat exchanger 4, a compressor 3 is connected to the pipeline from the plate heat exchanger 11 to the outdoor condenser, a solenoid valve A5 is provided on the pipeline between the outdoor condenser and the vanadium battery system, the pipeline between the outdoor condenser and the vanadium battery system is connected to the pipeline between the outdoor condenser and the plate heat exchanger 4, and a solenoid valve B6 is provided.
[0029] The outlet of the shielded pump is connected to the fluorine inlet copper tube of evaporator A12 and evaporator B13 respectively, and the fluorine outlet copper tube of evaporator A12 and evaporator B13 is connected to the condenser. The condenser is connected to the refrigerant storage tank 7 pipeline, and the refrigerant storage tank 7 is connected to the inlet of the shielded pump through a copper tube, forming a closed loop of the refrigeration system.
[0030] Example 2
[0031] The high-efficiency supplementary cooling system has a heat exchange system with a 70KW external unit and two 35KW evaporators running synchronously. The original solution was configured with a pump-driven phase change refrigeration unit. In May, tree hair began to block the condenser. As the ambient temperature rose, the cooling capacity was insufficient and unstable, and the electrolyte temperature could not be controlled. After the natural cold source compressor supplementary cooling unit was in place, the modified battery system continued to test and run, and the following conclusions were drawn by comparing the test results before and after:
[0032] 1. Under the selected working conditions, the cooling capacity output of the pump-driven phase change refrigeration unit is between 42KW and 58KW, which is a particularly large gap and does not reach the rated 70KW.
[0033] Under the same working conditions, the cooling capacity output of the natural cooling source compressor supplementary cooling system is relatively stable between 70 and 75KW.
[0034] The above-mentioned embodiments are only preferred embodiments of the present invention, but not all feasible embodiments of the present invention. For those skilled in the art, any obvious changes made to the present invention without departing from the principle and spirit of the present invention should be considered to be included in the scope of protection of the claims of the present invention.
Claims
1. The high-efficiency cooling and heat exchange system applied to the vanadium battery system is characterized by: A plate heat exchanger (4) is provided on the pipeline between the outdoor condenser and the refrigerant liquid storage tank (7); an expansion valve C (11) is provided on the pipeline from the outdoor condenser to the plate heat exchanger (4); a compressor (3) is connected to the pipeline from the plate heat exchanger (4) to the outdoor condenser; a solenoid valve A (5) is provided on the pipeline between the outdoor condenser and the vanadium battery system; the pipeline between the outdoor condenser and the vanadium battery system is connected to the pipeline between the outdoor condenser and the plate heat exchanger, and is provided with a solenoid valve B (6).