Low-cost heat dissipation cooling system of liquid cooling charging pile group

Abstract

The invention relates to the technical field of heat dissipation, in particular to a liquid cooling charging pile group low-cost heat dissipation cooling system which comprises a plurality of liquid cooling charging piles, an air cooling water chilling unit, an ice storage container and a heat exchanger. The air-cooled chiller unit is connected with the cold storage container and then is connected with the plurality of liquid-cooled charging piles through the heat exchanger; the liquid-cooling charging pile comprises a liquid-cooling charging module, a liquid-cooling charging line gun and a variable-frequency circulating pump, the liquid-cooling charging pile adopts a liquid-cooling cold plate for heat exchange, and the liquid-cooling cold plate is provided with a heat exchange liquid inlet and a heat exchange liquid outlet. A container ice storage working condition is adopted, and heat energy released by the charging pile is absorbed by utilizing two processes of step electricity price, ice storage at night, cold release and heat dissipation at daytime, and full utilization of ice melting into water and water temperature rise, so that high electricity price in the peak period of electricity consumption can be avoided, peak shifting of heat dissipation electricity consumption is realized, and the operation electricity cost of heat dissipation is reduced; the ice storage capacity can reach 75-95 kwh / m < 3 >, and the heat dissipation requirement of the charging pile under the peak electricity price can be completely or partially replaced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of heat dissipation technology, in particular to a low-cost heat dissipation cooling system for liquid-cooled charging piles. BACKGROUND

[0002] New energy vehicles have higher requirements for charging timeliness. The DC fast charging power of the charging pile is 120kw, 180kw to super charging power 400kw and higher, and the larger the power of the charging pile, the greater the heat dissipation required. The performance of heat dissipation directly affects the safety and service life of the charging pile. The charging efficiency of the existing charging module can basically reach 95% or more, and a large amount of heat is generated. The heat dissipation work for less than 5% of the energy needs to be done, and the cost of this part of the heat dissipation work can be regarded as the operating cost of the charging pile in use.

[0003] In the prior art, high-power charging piles basically use forced air cooling or liquid cooling for heat dissipation. The charging pile basically uses a single pile to independently configure a forced refrigeration unit to implement forced refrigeration and heat dissipation according to the heat generation of the charging pile. Although the liquid-cooled charging pile can achieve good heat dissipation, the liquid-cooled charging pile integrated with a liquid cooling plate and a refrigeration unit has the problems of high heat dissipation operating cost and energy saving. SUMMARY

[0004] The present application relates to the field of heat dissipation technology, in particular to a low-cost heat dissipation cooling system for liquid-cooled charging piles.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0006] A low-cost heat dissipation cooling system for liquid-cooled charging piles, comprising a plurality of liquid-cooled charging piles, an air-cooled chiller, an ice storage container and a heat exchanger;

[0007] The air-cooled chiller and the ice storage container are connected through the heat exchanger and connected to the plurality of liquid-cooled charging piles;

[0008] The liquid-cooled charging pile comprises a liquid-cooled charging module, a liquid-cooled charging gun and a variable frequency circulating pump. The liquid-cooled charging pile uses a liquid-cooled cold plate for heat exchange, and the liquid-cooled cold plate is provided with a heat exchange liquid inlet and a heat exchange liquid outlet. The variable frequency circulating pump operates at variable frequency based on the charging power of the liquid-cooled charging pile and the ambient temperature;

[0009] The ice storage container comprises an insulation box, an ice storage coil pipe, an inlet pipe and an outlet pipe. The inside of the insulation box is filled with water, and the water volume filling rate in the insulation box is 80%-90%. The outer structure of the insulation box is rust-proof metal, and the insulation box is provided with an insulation material layer;

[0010] The air-cooled chiller, the ice storage container and the heat exchanger are one of an integrated device and a multifunctional module device.

[0011] The pipeline consisting of the air-cooled chiller, ice storage container, and heat exchanger is filled with coolant, which is either ethylene glycol liquid or a water + ethylene glycol mixture.

[0012] Preferably, the air-cooled chiller unit and the cold storage container are connected in series or in parallel.

[0013] Preferably, the air-cooled chiller unit is equipped with a first variable frequency ethylene glycol pump at its output end, and the air-cooled chiller unit and the ice storage container are equipped with a first three-way valve, a second three-way valve, a third three-way valve and a fourth three-way valve at the connection joint, so that any two channels can be connected or all three channels can be fully connected, and a second variable frequency ethylene glycol pump is connected in reverse parallel at the water inlet pipe or water outlet pipe.

[0014] The air-cooled chiller unit and the ice storage container can achieve one of the following conditions: container ice storage, container heat dissipation, unit heat dissipation, or joint heat dissipation of the container and the unit.

[0015] Preferably, temperature sensors are distributed inside the insulation box, and the temperature range inside the insulation box is -5-35℃, so that the insulation box contains either a mixture of ice and water or liquid water.

[0016] Preferably, the ice storage coil consists of one longitudinally threaded copper tube and two transversely threaded copper tubes, with the two transversely threaded copper tubes welded onto the longitudinally threaded copper tube. The diameter of both the longitudinally threaded copper tube and the transversely threaded copper tube is 20-30mm, the spacing between the two tubes is 30-50mm, and the thickness of both tubes is ≤1.5mm. Both ends of the longitudinally threaded copper tube are fixedly connected to the inlet pipe and the outlet pipe, respectively.

[0017] Preferably, the ice storage coil is composed of multiple rectangular capillary networks, each comprising multiple rectangular capillaries. Adjacent rectangular capillaries are connected diagonally by a connecting pipe. The multiple rectangular capillary networks are placed in parallel, and a converging pipe and a separating pipe are fixedly connected to the inner walls of each network. The converging pipe is close to the inlet pipe and its inner wall is connected to the inlet pipe. The separating pipe is close to the outlet pipe and its inner wall is connected to the outlet pipe. The diameter of each rectangular capillary is ≤5mm, and the parallel distance between two adjacent rectangular capillary networks is 10-15mm.

[0018] Preferably, the heat exchanger is one of a plate heat exchanger, a shell-and-tube heat exchanger, or a tube-and-shell heat exchanger.

[0019] Preferably, the liquid-cooled charging pile can be configured as one of the following: a ring-shaped pipeline, a single-loop pipeline, or a 1+N backup pipeline.

[0020] Preferably, the internal volume of the insulation box is V = K * 3600 * (q * T * n) / (ρ * (c * 40 + 334)).

[0021] Compared with existing technologies, the advantages of this invention are:

[0022] 1. Utilizing container ice storage, and taking advantage of tiered electricity pricing, ice is stored at night and released for heat dissipation during the day. This fully leverages the heat energy released by the charging piles during the ice melting into water and the water heating process, avoiding high electricity prices during peak hours, achieving peak-shifting of heat dissipation power consumption, and reducing operating electricity costs for heat dissipation; the ice storage capacity can reach 75-95 kWh / m³. 3 It can completely or partially replace the heat dissipation needs of charging piles under peak electricity prices.

[0023] 2: Air-cooled chiller units use a large temperature difference in water supply and return, which can improve unit efficiency and achieve energy saving. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0025] Figure 2 This is a schematic diagram of the structure of the ice storage containers connected in parallel in Example 1;

[0026] Figure 3 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0027] Figure 4 This is a top view of the structure of multiple rectangular capillary networks in Example 2;

[0028] Figure 5 This is a schematic diagram of the structure of the ice storage containers connected in parallel in Example 2;

[0029] Figure 6 This is a schematic diagram of the structure of Embodiment 3 of the present invention;

[0030] Figure 7 This is a schematic diagram of the structure of the container unit using the common heat dissipation mode in Example 3;

[0031] Figure 8 This is a schematic diagram of the container ice storage condition used in Example 3;

[0032] Figure 9 This is a schematic diagram of the container heat dissipation condition used in Example 3;

[0033] Figure 10 This is a schematic diagram of the unit's heat dissipation operation in Example 3;

[0034] Figure 11 This is a schematic diagram of the structure of Embodiment 4 of the present invention;

[0035] Figure 12 This is a schematic diagram of the structure of the container unit using the common heat dissipation mode in Example 4;

[0036] Figure 13 This is a schematic diagram of the container ice storage condition used in Example 4;

[0037] Figure 14 This is a schematic diagram of the container heat dissipation condition used in Example 4;

[0038] Figure 15 This is a schematic diagram of the unit's heat dissipation operation in Example 4.

[0039] In the diagram: 1. Liquid-cooled charging pile; 2. Air-cooled chiller unit; 3. Ice storage container; 31. Insulated box; 32. Ice storage coil; 321. Longitudinal threaded copper pipe; 322. Transverse threaded copper pipe; 323. Rectangular capillary tube; 324. Connecting pipe; 325. Converging pipe; 326. Separating pipe; 33. Inlet pipe; 34. Outlet pipe; 4. Heat exchanger; 5. First variable frequency ethylene glycol pump; 61. First three-way valve; 62. Second three-way valve; 63. Third three-way valve; 64. Fourth three-way valve; 7. Second variable frequency ethylene glycol pump. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] A low-cost heat dissipation and cooling system for a liquid-cooled charging pile group includes multiple liquid-cooled charging piles 1, an air-cooled chiller unit 2, an ice storage container 3, and a heat exchanger 4.

[0042] After the air-cooled chiller unit 2 is connected to the cold storage container 3, it is connected to multiple liquid-cooled charging piles 1 through the heat exchanger 4.

[0043] The liquid-cooled charging pile 1 includes a liquid-cooled charging module, a liquid-cooled charging gun and a variable frequency circulating pump. The liquid-cooled charging pile 1 uses a liquid-cooled plate for heat exchange, and the liquid-cooled plate is provided with a heat exchange liquid inlet and a heat exchange liquid outlet. The variable frequency circulating pump operates based on the charging power of the liquid-cooled charging pile 1 and the ambient temperature.

[0044] The ice storage container 3 includes an insulated box 31, an ice storage coil 32, an inlet pipe 33, and an outlet pipe 34. The inside of the insulated box 31 is filled with water, and the water volume in the insulated box 31 is 80%-90% full. The outer structure of the insulated box 31 is made of rust-proof metal, and the inside of the insulated box 31 is provided with an insulation material layer.

[0045] The air-cooled chiller unit 2, the ice storage container 3, and the heat exchanger 4 are one type of integrated equipment and multi-functional modular equipment;

[0046] The pipeline consisting of the air-cooled chiller 2, the ice storage container 3, and the heat exchanger 4 is filled with coolant, which is either ethylene glycol liquid or a mixture of water and ethylene glycol.

[0047] The air-cooled chiller unit 2 and the cold storage container 3 are connected in series or in parallel.

[0048] The air-cooled chiller unit 2 is equipped with a first variable frequency ethylene glycol pump 5 at its output end. The connection joint between the air-cooled chiller unit 2 and the ice storage container 3 is equipped with a first three-way valve 61, a second three-way valve 62, a third three-way valve 63 and a fourth three-way valve 64, so that any two channels can be connected or all three channels can be connected. The inlet pipe 33 or the outlet pipe 34 is connected in reverse parallel with a second variable frequency ethylene glycol pump 7.

[0049] The air-cooled chiller unit 2 and the ice storage container 3 can achieve one of the following conditions: container ice storage, container heat dissipation, unit heat dissipation, or joint heat dissipation of the container and the unit.

[0050] Temperature sensors are distributed inside the insulation box 31. The temperature range inside the insulation box 31 is -5 to 35℃, which results in a state where ice and water are mixed or liquid water exists inside the insulation box 31.

[0051] Heat exchanger 4 is one of the following: plate heat exchanger, shell-and-tube heat exchanger, or tube-and-shell heat exchanger.

[0052] The liquid-cooled charging pile 1 can be configured as one of the following: ring-shaped, single-loop pipeline, or 1+N backup pipeline.

[0053] The internal volume of the insulated box 31 is V=K*3600*(q*T*n) / (ρ*(c*40+334)).

[0054] Where K is the redundancy coefficient, and K takes a value of 1.1-1.2;

[0055] q represents the heating power of a single charging pile, in kW;

[0056] T represents the average usage time during peak hours, in hours.

[0057] n is the number of charging stations;

[0058] ρ is the density of water, in kg / m³ 3 Take 1000 kg / m 3 ;

[0059] c is the specific heat of water at constant pressure, in kJ / (kg·℃), which is taken as 4.18 kJ / (kg·℃).

[0060] The present invention will now be described through specific embodiments.

[0061] Example 1

[0062] Reference Figures 1-2 The water volume filling rate of the insulated box 31 is 90%. The outer structure of the insulated box 31 is made of stainless steel and has an inner insulation material layer. The ice storage coil 32 consists of one longitudinal threaded copper pipe 321 and two transverse threaded copper pipes 322. The two transverse threaded copper pipes 322 are welded to the longitudinal threaded copper pipe 321. The diameter of both the longitudinal threaded copper pipe 321 and the transverse threaded copper pipe 322 is 20-30mm. The distance between the copper pipes is 30-50mm. The thickness of both the longitudinal threaded copper pipe 321 and the transverse threaded copper pipe 322 is ≤1.5mm. The two ends of the longitudinal threaded copper pipe 321 are fixedly connected to the water inlet pipe 33 and the water outlet pipe 34, respectively.

[0063] Furthermore, multiple ice storage containers 3 can be connected in parallel to form a larger size and larger capacity ice storage container 3, such as... Figure 2 As shown.

[0064] Example 2

[0065] Reference Figures 3-5 The water volume filling rate of the insulated box 31 is 85%. The outer structure of the insulated box 31 is an aluminum box and the inner part is equipped with an insulation material layer. The ice storage coil 32 is composed of multiple rectangular capillary networks. The rectangular capillary network includes multiple rectangular capillary tubes 323. The diagonals of two adjacent rectangular capillary tubes 323 are connected by a connecting pipe 324. The multiple rectangular capillary networks are placed in parallel, and the inner walls of the multiple rectangular capillary networks are respectively fixedly connected to a converging pipe 325 and a separating pipe 326. The converging pipe 325 is close to the inlet pipe 33 and the inner wall of the converging pipe 325 is connected to the inlet pipe 33. The separating pipe 326 is close to the outlet pipe 34 and the inner wall of the separating pipe 326 is connected to the outlet pipe 34. The diameter of the rectangular capillary tubes 323 is ≤5mm, and the parallel distance between two adjacent rectangular capillary networks is 10-15mm.

[0066] Furthermore, multiple ice storage containers 3 can be connected in parallel to form a larger size and larger capacity ice storage container 3, such as... Figure 5 As shown.

[0067] Example 3

[0068] like Figure 6 As shown, the air-cooled chiller 2, the ice storage container 3, and the heat exchanger 4 are connected in parallel.

[0069] like Figure 7As shown, the parallel connection joint between the air-cooled chiller unit 2 and the ice storage container 3 is connected to the first three-way valve 61, the second three-way valve 62, the third three-way valve 63, and the fourth three-way valve 64, respectively. The three channels on the first three-way valve 61, the second three-way valve 62, the third three-way valve 63, and the fourth three-way valve 64 are respectively represented by ka, kb, and kc. The outlet pipe 34 is connected in reverse parallel to the second variable frequency ethylene glycol pump 7. The output end of the air-cooled chiller unit 2 is equipped with the first variable frequency ethylene glycol pump 5. Multiple liquid-cooled charging piles 1 are connected by a single pipeline. The heat exchange and transfer are achieved by water circulation and heat exchangers.

[0070] When the container unit uses a shared cooling mode, the status table of the first three-way valve 61, the second three-way valve 62, the third three-way valve 63, the fourth three-way valve 64, the first variable frequency glycol pump 5, and the second variable frequency glycol pump 7 is as follows:

[0071]

[0072]

[0073] like Figure 8 As shown, the status table of the first three-way valve 61, the second three-way valve 62, the third three-way valve 63, the fourth three-way valve 64, the first variable frequency glycol pump 5, and the second variable frequency glycol pump 7 when using container ice storage is as follows:

[0074]

[0075] like Figure 9 As shown, when the container heat dissipation mode is used, the status table of the first three-way valve 61, the second three-way valve 62, the third three-way valve 63, the fourth three-way valve 64, the first variable frequency glycol pump 5, and the second variable frequency glycol pump 7 is as follows:

[0076]

[0077] like Figure 10 As shown, when the unit is in heat dissipation mode, the status table of the first three-way valve 61, the second three-way valve 62, the third three-way valve 63, the fourth three-way valve 64, the first variable frequency glycol pump 5, and the second variable frequency glycol pump 7 is as follows:

[0078]

[0079] Example 4

[0080] Reference Figure 11 The air-cooled chiller 2, the ice storage container 3, and the heat exchanger 4 are connected in series.

[0081] Reference Figure 12The air-cooled chiller unit 2 and the ice storage container 3 are connected in parallel to the first three-way valve 61, the second three-way valve 62, the third three-way valve 63 and the fourth three-way valve 64 respectively. The three channels on the first three-way valve 61, the second three-way valve 62, the third three-way valve 63 and the fourth three-way valve 64 are respectively represented by ka, kb and kc. The outlet pipe 34 is connected in reverse parallel to the second variable frequency ethylene glycol pump 7. The output end of the air-cooled chiller unit 2 is equipped with the first variable frequency ethylene glycol pump 5. Multiple liquid-cooled charging piles 1 are connected by a single pipeline. The heat exchange and transfer are achieved by water circulation and heat exchanger.

[0082] When the container unit uses a shared cooling mode, the status table of the first three-way valve 61, the second three-way valve 62, the third three-way valve 63, the fourth three-way valve 64, the first variable frequency glycol pump 5, and the second variable frequency glycol pump 7 is as follows:

[0083]

[0084]

[0085] like Figure 13 As shown, the status table of the first three-way valve 61, the second three-way valve 62, the third three-way valve 63, the fourth three-way valve 64, the first variable frequency glycol pump 5, and the second variable frequency glycol pump 7 when using container ice storage is as follows:

[0086]

[0087] like Figure 14 As shown, when the container heat dissipation mode is used, the status table of the first three-way valve 61, the second three-way valve 62, the third three-way valve 63, the fourth three-way valve 64, the first variable frequency glycol pump 5, and the second variable frequency glycol pump 7 is as follows:

[0088]

[0089]

[0090] like Figure 15 As shown, when the unit is in heat dissipation mode, the status table of the first three-way valve 61, the second three-way valve 62, the third three-way valve 63, the fourth three-way valve 64, the first variable frequency glycol pump 5, and the second variable frequency glycol pump 7 is as follows:

[0091]

[0092] It should be noted that the heat dissipation and cooling system in this invention can be used not only for charging piles, but also in other scenarios, such as energy storage and data center servers.

[0093] In this invention, a container ice storage mode is adopted, utilizing tiered electricity pricing to store ice at night and release it for heat dissipation during the day. This fully leverages the two processes of ice melting into water and water heating to absorb the heat energy released by the charging pile. This avoids high electricity prices during peak hours, achieving peak-shifting of heat dissipation power consumption and reducing the operating electricity cost of heat dissipation. The ice storage capacity can reach 75-95 kWh / m³. 3 It can completely or partially replace the heat dissipation needs of charging piles under peak electricity prices.

[0094] Meanwhile, the air-cooled chiller unit 2 uses a large temperature difference for water supply and return, which can improve the unit's efficiency and achieve energy saving.

[0095] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A liquid-cooled charging pile group low-cost heat dissipation cooling system, characterized in that, It comprises a plurality of liquid-cooled charging piles (1), air-cooled water chillers (2), ice storage containers (3) and heat exchangers (4); The air-cooled water chillers (2) are connected with the ice storage containers (3) through the heat exchangers (4) and are connected with the plurality of liquid-cooled charging piles (1); The liquid-cooled charging pile (1) comprises a liquid-cooled charging module, a liquid-cooled charging wire gun and a variable frequency circulating pump, the liquid-cooled charging pile (1) uses a liquid-cooled cold plate for heat exchange, the liquid-cooled cold plate is provided with a heat exchange liquid inlet and a heat exchange liquid outlet, and the variable frequency circulating pump operates at variable frequency based on the charging power of the liquid-cooled charging pile (1) and the ambient temperature. The ice storage container (3) comprises an insulation box body (31), an ice storage coil pipe (32), a water inlet pipe (33) and a water outlet pipe (34), the inside of the insulation box body (31) is filled with water, the water volume filling rate in the insulation box body (31) is 80%-90%, the outer structure of the insulation box body (31) is a rust-proof metal, and the insulation box body (31) is provided with an insulation material layer. The air-cooled water chiller (2), the ice storage container (3) and the heat exchanger (4) are one of an integrated equipment and a multifunctional module equipment. Cooling liquid is arranged in the pipeline formed by the air-cooled water chiller (2), the ice storage container (3) and the heat exchanger (4), and the cooling liquid is one of ethylene glycol liquid, water and ethylene glycol mixed liquid.

2. The low-cost cooling system for liquid-cooled charging pile groups according to claim 1, characterized in that, The air-cooled water chiller (2) and the ice storage container (3) are connected in series or in parallel.

3. The low-cost cooling system for liquid-cooled charging pile groups according to claim 2, characterized in that, A first variable frequency ethylene glycol pump (5) is arranged at the output end of the air-cooled water chiller (2), first, second, third and fourth three-way valves (61, 62, 63 and 64) are arranged at the connection joint between the air-cooled water chiller (2) and the ice storage container (3), so that any two channels are connected or all three channels are connected, and a second variable frequency ethylene glycol pump (7) is reversely connected in parallel with the water inlet pipe (33) or the water outlet pipe (34). The air-cooled water chiller (2) and the ice storage container (3) can realize one of a container ice storage condition, a container heat dissipation condition, a chiller heat dissipation condition and a container and chiller heat dissipation condition.

4. The low-cost cooling system for liquid-cooled charging piles according to claim 1, wherein, Temperature sensors are distributed in the insulation box body (31), the temperature in the insulation box body (31) ranges from-5 to 35℃, and the ice water mixture or liquid water exists in the insulation box body (31).

5. The low-cost cooling system for liquid-cooled charging piles according to claim 1, wherein, The ice storage coil pipe (32) comprises one longitudinal threaded copper pipe (321) and two transverse threaded copper pipes (322), the two transverse threaded copper pipes (322) are welded on the longitudinal threaded copper pipe (321), the diameters of the longitudinal threaded copper pipe (321) and the transverse threaded copper pipe (322) are both 20-30mm, the copper pipe spacing between the longitudinal threaded copper pipe (321) and the transverse threaded copper pipe (322) is 30-50mm, the thicknesses of the longitudinal threaded copper pipe (321) and the transverse threaded copper pipe (322) are both ≤1.5mm, and the longitudinal threaded copper pipe (321) is fixedly connected with the water inlet pipe (33) and the water outlet pipe (34) at both ends.

6. The low-cost cooling system for liquid-cooled charging pile groups of claim 1, wherein, The ice storage coil (32) is composed of a plurality of rectangular capillary tube networks, the rectangular capillary tube network comprises a plurality of rectangular capillary tubes (323), two adjacent rectangular capillary tubes (323) are communicated through a communicating pipe (324) between diagonal lines, a plurality of rectangular capillary tube networks are placed in parallel, and inner walls of the plurality of rectangular capillary tube networks are respectively fixedly connected with a converging pipe (325) and a separating pipe (326), the converging pipe (325) is close to the water inlet pipe (33), the inner wall of the converging pipe (325) is communicated with the water inlet pipe (33), the separating pipe (326) is close to the water outlet pipe (34), and the inner wall of the separating pipe (326) is communicated with the water outlet pipe (34), the diameter of the rectangular capillary tube (323) is less than or equal to 5 mm, and the distance between two adjacent rectangular capillary tube networks in parallel is 10-15 mm.

7. The low-cost cooling system for liquid-cooled charging pile groups of claim 1, wherein, The heat exchanger (4) is one of a plate heat exchanger, a double-pipe heat exchanger and a shell-and-tube heat exchanger.

8. The low-cost cooling system for liquid-cooled charging pile groups of claim 1, wherein, The liquid-cooled charging pile (1) can be one of a ring, a single circulation pipeline and a 1+N backup pipeline.

9. The low-cost cooling system for liquid-cooled charging pile groups of claim 1, wherein, The inner volume V of the heat preservation box body (31) is K*3600*(q*T*n) / (p*(c*40+334)). The heat exchanger (4) is one of a plate heat exchanger, a double-pipe heat exchanger and a shell-and-tube heat exchanger.

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