Liquid cooling unit structure
By setting two cooling circuits and a current limiting section in the liquid cooling unit, real-time temperature regulation and energy-saving cooling of multiple charging modules of the car charging pile are realized, solving the problem of poor structural adjustability of traditional liquid cooling units and improving the energy efficiency and control accuracy of the charging pile.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WUHAN SONGZ AUTOMOBILE AIR CONDITIONING CO LTD
- Filing Date
- 2025-07-24
- Publication Date
- 2026-07-24
Smart Images
Figure CN224545739U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of heat dissipation technology for automobile charging piles, and in particular to a liquid cooling unit structure. Background Technology
[0002] With the rapid development of new energy vehicles, the structure of charging piles for these vehicles is also evolving rapidly. Charging pile structures from various brands are all moving towards higher power charging. Especially with fast charging piles, a significant amount of heat is generated during the charging process. To prevent overheating from affecting charging power, liquid cooling units are typically installed to cool the internal electrical components. Traditional air conditioning cooling circuits generally cool one-to-one, making it difficult to control the cooling level in real time based on the temperature of the charging modules. Therefore, when cooling multiple charging modules simultaneously, their energy efficiency is often poor. Utility Model Content
[0003] The main purpose of this utility model is to propose a liquid cooling unit structure, which aims to solve the problems of poor real-time adjustability and poor energy-saving performance of traditional liquid cooling unit structures for car charging piles.
[0004] To achieve the above objectives, the liquid-cooled unit structure proposed in this utility model is applied to an electric vehicle charging pile, which includes two charging module stacks. The liquid-cooled unit structure includes:
[0005] Refrigeration system;
[0006] An antifreeze cooling system includes a first cooling circuit and a second cooling circuit, wherein the second cooling circuit is connected to the refrigeration system;
[0007] A manifold, connected to the output terminal of the refrigeration system, and simultaneously connected to both the first cooling circuit and the second cooling circuit, for mixing and heat exchange of antifreeze in the first and second cooling circuits; and,
[0008] A flow restrictor is provided on the second cooling circuit corresponding to the input end of the refrigeration system to regulate the flow rate of the antifreeze that exchanges heat in the refrigeration system.
[0009] The first cooling circuit and the second cooling circuit are respectively connected to two charging module stacks to cool and dissipate heat from the two charging module stacks respectively.
[0010] In one embodiment, the antifreeze cooling system further includes a circulating water tank, and both the first cooling circuit and the second cooling circuit are connected to the circulating water tank.
[0011] In one embodiment, the circulating water tank is configured as an expansion tank structure.
[0012] In one embodiment, the first cooling circuit includes a first heat dissipation water tank, with its two ends connected to the confluence section and the circulating water tank, respectively; and / or,
[0013] The second cooling circuit includes a second heat dissipation tank, and the two ends of the second heat dissipation tank are respectively connected to the confluence section and the circulating water tank.
[0014] In one embodiment, the antifreeze cooling system further includes a first pump body and a second pump body, which are respectively disposed in the first cooling circuit and the second cooling circuit to promote the circulation of antifreeze in the first cooling circuit and the second cooling circuit, respectively.
[0015] In one embodiment, a first heat exchange pipeline is formed between the first pump body and the first heat dissipation tank, and one of the charging module stacks is installed in the first heat exchange pipeline; and / or,
[0016] A second heat exchange pipeline is formed between the second pump body and the second heat dissipation tank, and one of the charging modules is installed in the second heat exchange pipeline.
[0017] In one embodiment, the manifold includes at least two drain ports;
[0018] The inlet ends of the first pump body and the second pump body are respectively connected to the two outlets of the confluence section.
[0019] In one embodiment, a regulating pipe section is provided between the circulating water tank and the refrigeration system;
[0020] The flow limiting part is specifically configured as a solenoid valve, which is installed on the regulating pipe section.
[0021] In one embodiment, the refrigeration system includes a plate heat exchanger, the inlet end of which is connected to the regulating pipe section, and the outlet end of which is connected to the manifold.
[0022] In one embodiment, the refrigeration system further includes a compressor unit, a condenser assembly, and an expansion valve. The condenser assembly is disposed between the compressor unit and the expansion valve. The expansion valve and the compressor unit are respectively connected to both ends of the plate heat exchanger to form a compressor condensation circuit.
[0023] The technical solution of this utility model includes at least two cooling circuits, one of which is connected to the refrigeration system. In actual use, the entire liquid-cooled unit can achieve temperature regulation of multiple cooling circuits through only one refrigeration system. Furthermore, the actual operating conditions of the refrigeration system can be adjusted according to the actual opening degree of the flow-limiting section. This configuration further reduces energy consumption during the operation of the refrigeration system. The entire structure forms an automatic control system consisting of a temperature monitoring structure, a flow-limiting section, and a refrigeration system, characterized by simple control and high energy efficiency. Attached Figure Description
[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0025] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the liquid cooling unit provided by this utility model.
[0026] Explanation of icon numbers:
[0027] 1. Refrigeration system; 11. Plate heat exchanger; 12. Compressor equipment; 13. Condenser assembly; 14. Expansion valve; 2. First cooling circuit; 21. First heat dissipation tank; 22. First pump body; 23. First heat exchange pipeline; 3. Second cooling circuit; 31. Second heat dissipation tank; 32. Second pump body; 33. Regulating pipe section; 331. Solenoid valve; 34. Second heat exchange pipeline; 35. Manifold; 4. Charging module stack; 5. Circulating water tank.
[0028] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.
[0030] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.
[0031] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. "Multiple" refers to two or more. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0032] With the rapid development of new energy vehicles, the structure of charging piles for these vehicles is also evolving rapidly. Charging pile structures from various brands are all moving towards higher power charging. Especially with fast charging piles, a significant amount of heat is generated during the charging process. To prevent overheating from affecting charging power, liquid cooling units are typically installed to cool the internal electrical components. Traditional air conditioning cooling circuits generally cool one-to-one, making it difficult to control the cooling level in real time based on the temperature of the charging modules. Therefore, when cooling multiple charging modules simultaneously, their energy efficiency is often poor.
[0033] This utility model proposes a liquid cooling unit structure to solve the above problems.
[0034] Please see Figure 1In one embodiment of this utility model, a liquid-cooled unit structure is provided, primarily for use in automotive charging pile structures. The main advantage of this liquid-cooled unit structure lies in the formation of at least two cooling circuits. The air conditioning compressor is mainly connected to one of these cooling circuits, but can simultaneously regulate the antifreeze temperature in the other cooling circuit. This allows for simultaneous temperature regulation of both cooling circuits using only one compressor system, enabling simultaneous cooling and heat dissipation for both charging module stacks 4, and providing multi-level temperature adjustment. In practical applications, the structural design of this solution already demonstrates good energy-saving performance.
[0035] Specifically, the liquid-cooled unit structure includes a refrigeration system 1, an antifreeze cooling system, a manifold 35, and a flow restrictor. The antifreeze cooling system includes a first cooling circuit 2 and a second cooling circuit 3, with the second cooling circuit 3 connected to the refrigeration system 1. The manifold 35 is located at the output end of the refrigeration system 1 and between the first cooling circuit 2 and the second cooling circuit 3 to combine the flow in the first cooling circuit 2 and the second cooling circuit 3, allowing the antifreeze in the first cooling circuit 2 and the second cooling circuit 3 to mix and exchange heat. The flow restrictor is located on the second cooling circuit 3 corresponding to the input end of the refrigeration system 1 to regulate the flow rate of the antifreeze exchanging heat at the refrigeration system 1. The first cooling circuit 2 and the second cooling circuit 3 are respectively connected to two charging module stacks 4 for cooling and heat dissipation of the two charging module stacks 4.
[0036] In the above embodiment, the second cooling circuit is connected to the refrigeration system 1. During operation, the refrigeration system 1 can exchange heat with the antifreeze in the second cooling circuit, thereby promoting rapid cooling of the antifreeze. Furthermore, in the actual structure, the manifold 35 is located between the first and second cooling circuits. The antifreeze in the two circuits can converge and mix at the manifold 35, thereby exchanging heat. After mixing, the antifreeze reaches a uniform temperature and is then delivered to portions of the pipes in the first and second cooling circuits, respectively, for cooling the two charging module stacks 4.
[0037] In the above structure, the flow-limiting part is located in the second cooling circuit and at the water inlet of the refrigeration system 1. Its main function is to adjust the flow rate of the antifreeze in the second cooling circuit at the location of the refrigeration system 1. This configuration allows for multiple cooling levels to be adjusted in the two cooling circuits. For example, when the temperature of the charging module stack 4 is relatively low, the refrigeration system 1 can be inactive. In a practical configuration, corresponding fan structures can be installed on the first cooling circuit 2 and the second cooling circuit 3, allowing for heat dissipation of the charging module stack 4 solely through natural ventilation. As the temperature of the charging module stack 4 gradually rises, the refrigeration system 1 can be activated. During this process, the opening degree of the flow-limiting part can be controlled simultaneously, thus controlling the flow rate of the antifreeze introduced into the refrigeration system 1 for heat exchange. When the temperature of the charging module stack 4 reaches the opening requirement of the cooling system 1, and its actual temperature is not very high, for example, around 30°C, the opening degree of the current limiting part can be controlled to be small, allowing a small flow of antifreeze to exchange heat in the cooling system 1. When the temperature of the charging module stack 4 slowly rises, the opening degree of the current limiting part can be increased simultaneously to increase the flow rate of antifreeze exchanging heat at the location of the cooling system 1 per unit time, so that the antifreeze mixed in the manifold 35 can be cooled down quickly, thereby achieving a better cooling effect.
[0038] In practical applications, the actual operating conditions of the refrigeration system 1 can be adjusted according to the actual opening degree of the current-limiting section. For example, when the actual opening degree of the current-limiting section is small, the refrigeration system 1 can output a small power; when the actual opening degree of the current-limiting section is large, the actual power of the refrigeration system 1 needs to be increased accordingly. In practice, a mapping relationship can be established between the opening degree of the current-limiting section and the output power of the refrigeration system 1. When the entire liquid-cooled unit structure is working, the operating state of the refrigeration system 1 can be automatically adjusted according to the actual opening degree of the current-limiting section. This setting can further reduce the energy consumption of the refrigeration system 1 during operation.
[0039] Another consideration is that a corresponding temperature monitoring structure also needs to be installed at the location of the charging module stack 4 to establish a mapping relationship between the temperature monitoring structure and the current limiting part. At this time, an automatic control system consisting of the temperature monitoring structure, the current limiting part, and the cooling system 1 can be formed.
[0040] It should be noted that the charging module stack 4 specifically refers to the battery charging structure composed of multiple electrical components within the car charging pile. Its core task is to efficiently and stably convert the input AC power (usually from the power grid, such as 380VAC three-phase or 220V AC single-phase) into the DC power required by the electric vehicle battery, and to perform precise voltage and current control. It typically includes power semiconductor devices (IGBT, MOSFET, etc.), high-frequency transformers, inductors, capacitors, control circuits, heat sinks, etc. Internally, it employs high-frequency switching power supply technology (such as PFC+LLC resonant converter) to achieve efficient conversion.
[0041] The antifreeze cooling system also includes a circulating water tank, and the first cooling circuit 2 and the second cooling circuit 3 are both connected to the circulating water tank.
[0042] Specifically, the circulating water tank is configured as an expansion tank structure. The expansion tank structure serves to maintain pressure and replenish system water, and is highly compatible with the liquid cooling unit structure in this solution. This solution uses one expansion tank structure; the specific number of expansion tanks can be configured according to the aforementioned cooling circuits. For example, this solution uses two expansion tanks, each installed in one of the two cooling circuits, which achieves the same working effect. Therefore, the specific configuration can be determined based on actual production data.
[0043] In one embodiment of this solution, the first cooling circuit includes a first heat dissipation water tank 2131, and the two ends of the first heat dissipation water tank 2131 are respectively connected to the confluence part 35 and the circulating water tank and / or the second cooling circuit includes a second heat dissipation water tank, and the two ends of the second heat dissipation water tank are respectively connected to the confluence part 35 and the circulating water tank.
[0044] In terms of the actual structure of the cooling circuit, a traditional radiator structure is used to dissipate heat from the water. The antifreeze passes through multiple heat dissipation flat tubes on the radiator, which increases the contact area with the air and thus cools the antifreeze. In a conventional setup, a corresponding fan structure is added to accelerate the airflow at the heat dissipation flat tubes, thereby improving the cooling efficiency of the antifreeze.
[0045] In one embodiment of this application, a corresponding position is provided on the cooling circuit to install the charging module stack 4. Specifically, a first heat exchange pipe 23 is formed between the first pump body 22 and the first heat dissipation tank 2131, and one of the charging module stacks 4 is installed in the first heat exchange pipe 23 and / or a second heat exchange pipe 34 is formed between the second pump body 32 and the second heat dissipation tank, and one of the charging module stacks 4 is installed in the second heat exchange pipe 34.
[0046] In actual cooling of the charging module stack 4, the antifreeze flows from the expansion tank structure towards the manifold 35. As mentioned above, after the antifreeze mixes at the manifold 35 to achieve a uniform temperature, it is then diverted into two cooling circuits. To maximize the cooling effect of the antifreeze on the charging module stack 4, in practice, the charging module stack 4 is positioned as close as possible to the manifold 35, specifically at the locations of the first heat exchange pipe 23 and the second heat exchange pipe 34. This minimizes the risk of the antifreeze absorbing ambient heat and heating up, effectively improving the cooling effect on the charging module stack 4.
[0047] It is conceivable that the heat exchange between the first heat exchange pipe 23 and the second heat exchange pipe 34 and the charging module stack 4 can be carried out by contact conduction. The corresponding heat exchange pipe can be set as a metal pipe with good thermal conductivity, which can achieve a good thermal conductivity when in contact with the charging module stack 4.
[0048] In one embodiment of this solution, in order to maximize the circulation effect of the antifreeze, the antifreeze cooling system further includes a first pump body 22 and a second pump body 32. The first pump body 22 and the second pump body 32 are respectively disposed in the first cooling circuit 2 and the second cooling circuit 3, so as to promote the circulation of antifreeze in the first cooling circuit 2 and the second cooling circuit 3, respectively.
[0049] The manifold 35 includes at least two drain ports and two inlets. The inlets of the first pump body 22 and the second pump body 32 are respectively connected to the two drain ports of the manifold 35. The two inlets of the manifold 35 are respectively connected to the first cooling circuit 2 and the second cooling circuit 3 for introducing antifreeze into the two cooling circuits. The manifold 35 can be configured as a water collector or a water tank structure.
[0050] In this embodiment, the flow-limiting part is specifically configured as a solenoid valve 331. Specifically, a regulating pipe section 33 is provided between the circulating water tank and the refrigeration system 1; the flow-limiting part is specifically configured as a solenoid valve 331, which is installed on the regulating pipe section 33. The solenoid valve 331 structure is chosen because it allows for automatic control of the antifreeze flow rate. Of course, it is conceivable that, in addition to the solenoid valve 331 structure described above, the flow-limiting part can also be configured as various valve bodies capable of automatic control.
[0051] The refrigeration system 1 includes a plate heat exchanger 11, the liquid inlet of which is connected to the regulating pipe section 33, and the output end of which is connected to the water collector.
[0052] Furthermore, the refrigeration system 1 also includes a compressor unit 12, a condenser assembly 13, and an expansion valve 14. The condenser assembly 13 is located between the compressor unit 12 and the expansion valve 14. The expansion valve 14 and the compressor unit 12 are respectively connected to the two ends of the plate heat exchanger 11 to form a compressor condensation circuit.
[0053] During the actual operation of the compressor unit 12, in conjunction with the condenser and expansion valve 14, the refrigerant and the antifreeze can undergo efficient heat exchange at the plate heat exchanger 11. In actual operation, the refrigeration system 1, as described above, can be controlled in conjunction with the solenoid valve 331. In practical applications, this structure has clearly demonstrated good energy efficiency and economic benefits, showing promising application prospects.
[0054] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.
Claims
1. A liquid-cooled unit structure, applied to an electric vehicle charging pile, the electric vehicle charging pile comprising two charging module stacks, characterized in that, The liquid cooling unit structure includes: Refrigeration system; An antifreeze cooling system includes a first cooling circuit and a second cooling circuit, wherein the second cooling circuit is connected to the refrigeration system; A manifold, connected to the output terminal of the refrigeration system, and simultaneously connected to both the first cooling circuit and the second cooling circuit, for mixing and heat exchange of antifreeze in the first and second cooling circuits; and, A flow restrictor is provided on the second cooling circuit corresponding to the input end of the refrigeration system to regulate the flow rate of the antifreeze that exchanges heat in the refrigeration system. The first cooling circuit and the second cooling circuit are respectively connected to two charging module stacks to cool and dissipate heat from the two charging module stacks respectively.
2. The liquid-cooled unit structure as described in claim 1, characterized in that, The antifreeze cooling system also includes a circulating water tank, and both the first cooling circuit and the second cooling circuit are connected to the circulating water tank.
3. The liquid-cooled unit structure as described in claim 2, characterized in that, The circulating water tank is configured as an expansion tank.
4. The liquid-cooled unit structure as described in claim 2, characterized in that, The first cooling circuit includes a first heat dissipation water tank, with its two ends connected to the confluence section and the circulating water tank, respectively; and / or, The second cooling circuit includes a second heat dissipation tank, and the two ends of the second heat dissipation tank are respectively connected to the confluence section and the circulating water tank.
5. The liquid-cooled unit structure as described in claim 4, characterized in that, The antifreeze cooling system further includes a first pump body and a second pump body, which are respectively disposed in the first cooling circuit and the second cooling circuit to promote the circulation of antifreeze in the first cooling circuit and the second cooling circuit, respectively.
6. The liquid-cooled unit structure as described in claim 5, characterized in that, A first heat exchange pipeline is formed between the first pump body and the first cooling water tank, and one of the charging modules is installed in the first heat exchange pipeline; and / or, A second heat exchange pipeline is formed between the second pump body and the second heat dissipation tank, and one of the charging modules is installed in the second heat exchange pipeline.
7. The liquid-cooled unit structure as described in claim 6, characterized in that, The manifold includes at least two drain ports; The inlet ends of the first pump body and the second pump body are respectively connected to the two outlets of the confluence section.
8. The liquid-cooled unit structure as described in claim 2, characterized in that, A regulating pipe section is provided between the circulating water tank and the refrigeration system; The flow limiting part is specifically configured as a solenoid valve, which is installed on the regulating pipe section.
9. The liquid-cooled unit structure as described in claim 8, characterized in that, The refrigeration system includes a plate heat exchanger, the liquid inlet of which is connected to the regulating pipe section, and the output end of which is connected to the manifold.
10. The liquid-cooled unit structure as described in claim 9, characterized in that, The refrigeration system also includes a compressor unit, a condenser assembly, and an expansion valve. The condenser assembly is located between the compressor unit and the expansion valve. The expansion valve and the compressor unit are respectively connected to both ends of the plate heat exchanger to form a compressor condensation circuit.