Charging liquid cooling system

Abstract

The application discloses a charging liquid cooling system, which comprises a flow path, a first temperature sensor and a controller. The flow path comprises a main path, a first branch path and a second branch path. The first branch path and the second branch path are in parallel connection, the first branch path is in series connection with the main path, and the second branch path is in series connection with the main path. The main path comprises a liquid pump and a first heat exchanger, the liquid pump and the first heat exchanger are in series connection, and the first heat exchanger is located beside a power module. The second branch path comprises a second heat exchanger. The first temperature sensor is at least partially arranged outside a shell, and the first temperature sensor is in electrical connection with the controller. The charging liquid cooling system comprises an adjusting valve, and the adjusting valve is in electrical connection with the controller. The charging liquid cooling system has a heat exchange working state. In the heat exchange working state, the first heat exchanger exchanges heat with the power module. The controller controls the adjusting valve to adjust the liquid flow rate entering the first branch path and the second branch path according to the ambient temperature monitored by the first temperature sensor. Therefore, the power consumption of the liquid pump can be reduced.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of charging piles, and in particular to a charging liquid cooling system. BACKGROUND

[0002] With the rapid development of new energy vehicles, the demand for super charging piles is also increasing. In order to ensure that the battery of a new energy vehicle can be quickly charged, the power of a super charging pile is also increasing. The power of a charging module can reach more than 40Kw. The heat generation is also increasing, and the high temperature can cause the performance and reliability of the power module to decrease, and even cause the power module to fail. In the case of extremely high temperature, there is a risk of spontaneous combustion. In order to ensure that the power module is always within a safe temperature, a thermal management system is particularly important.

[0003] At present, a liquid cooling system is installed in the charging pile on the market, and the liquid cooling system can ensure that the power module is always within a safe temperature. However, with the increasing number of new energy vehicles, the charging pile is in a long-time running state, and all the liquid is always passed through the heat exchanger, so that the water pump in the charging pile runs for a long time under a large load condition, which is contrary to the concept of energy saving and environmental protection.

[0004] Therefore, it is necessary to provide a super charging liquid cooling system to solve the above problems. SUMMARY

[0005] The application aims to provide an energy-saving super charging liquid cooling system.

[0006] The application discloses a charging liquid cooling system for heat exchange of a power module in a charging pile shell, the charging liquid cooling system comprising a flow path, a first temperature sensor and a controller, the flow path comprising a main path, a first branch and a second branch, the first branch and the second branch being in parallel, the first branch being in series with the main path, and the second branch being in series with the main path; the main path comprising a liquid pump and a first heat exchanger, the liquid pump and the first heat exchanger being in series, and the first heat exchanger being used for heat exchange of the power module; the second branch comprising a second heat exchanger;

[0007] The first temperature sensor is at least partially arranged outside the shell, and the first temperature sensor is electrically connected with the controller;

[0008] The charging liquid cooling system comprises an adjusting valve, at least one of the first branch and the second branch is provided with the adjusting valve; or the first branch, the second branch and the main path have two connecting positions, and at least one of the connecting positions is provided with the adjusting valve, and the adjusting valve is electrically connected with the controller;

[0009] The charging liquid cooling system has a heat exchange working state, in which the first heat exchanger exchanges heat with the power module, and the controller controls the adjusting valve to adjust the liquid flow entering the first branch and / or the second branch according to the ambient temperature monitored by the first temperature sensor.

[0010] The charging liquid cooling system of the application is provided with a first temperature sensor and a controller. The controller can control the adjusting valve to adjust the liquid flow entering the first branch and the second branch including the second heat exchanger according to the ambient temperature monitored by the first temperature sensor, so as to adjust the flow of the liquid in the charging liquid cooling system through the second heat exchanger according to the ambient temperature, reduce the condition that all the liquid passes through the heat exchanger, thereby reducing the lift burden of the liquid pump and the power consumption of the liquid pump, and achieving the purpose of energy saving. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 is a perspective view of the charging pile shell of the application;

[0012] Figure 2 is an assembly perspective view of a plurality of first heat exchangers and a main pipeline;

[0013] Figure 3 is an assembly perspective view of a first heat exchanger, a first branch and a flow adjusting valve of the application;

[0014] Figure 4 is a block diagram of a first embodiment of the heating module in the charging liquid cooling system of the application;

[0015] Figure 5 is a block diagram of a second embodiment of the heating module in the charging liquid cooling system of the application;

[0016] Figure 6 is a block diagram of another embodiment of the adjusting valve in the charging liquid cooling system of the application. DETAILED DESCRIPTION

[0017] The following will be a detailed description of the exemplary specific embodiments of the application combined with the drawings. If there are several specific embodiments, the features in these embodiments can be combined with each other without conflict. When the description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise specified. The description in the following exemplary specific embodiments does not represent all the embodiments consistent with the application; on the contrary, they are only examples of devices, products and / or methods consistent with the claims of the application and some aspects of the application.

[0018] The terminology used in the present application is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present application. As used in the description of the application and the claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0019] It should be understood that the use of terms such as "first", "second" and similar terms in the description and claims of this application are not intended to denote any order, quantity, or importance, but are merely used to distinguish one feature from another. Similarly, the use of "one" or "a" or similar terms is not intended to denote a quantity of one, but rather the existence of at least one. Unless otherwise indicated, the terms "front", "back", "up", "down", and similar terms in the present application are used for convenience and are not limited to a particular position or spatial orientation. The terms "include" or "comprise" and similar terms are open-ended expressions that are intended to cover the elements listed after the term "include" or "comprise" and equivalents thereof, and are not limited to the elements listed after the term "include" or "comprise". If "several" appears in the present application, it means two or more.

[0020] Please refer to Figures 1 to 6 The present application discloses a charging liquid cooling system for heat exchange and cooling of power modules in a charging pile shell 1. The power module is one of the core components of the charging pile, and a large amount of heat is released during the process of fast charging of the power battery of new energy vehicles, resulting in rapid temperature rise of the power module. Excessive temperature can reduce the performance and reliability of the power module, and even cause its failure. In the case of extremely high temperature, there is also the risk of causing spontaneous combustion. The charging liquid cooling system of the present application can ensure that the power module is always within a safe temperature range, ensuring the safety and stability of the charging pile, while reducing its own power consumption, so that the charging liquid cooling system can achieve the purpose of energy saving.

[0021] Please refer to Figure 1 and Figures 4 to 6 The power module is arranged in the shell 1. The charging liquid cooling system comprises a flow path, a first temperature sensor 3 and a controller 4.

[0022] The first temperature sensor 3 is at least partially arranged outside the shell 1, and is configured to monitor the ambient temperature outside the shell 1 and is electrically connected to the controller 4. In the embodiment of the present application, the first temperature sensor 3 is arranged outside the shell 1, the controller 4 is arranged inside the shell 1, and the first temperature sensor 3 is electrically connected to the controller 4 through a signal line. In other embodiments, the first temperature sensor 3 is arranged on a wall of the shell 1, and a detection part of the first temperature sensor 3 monitors the ambient temperature outside the shell 1, which is not limited herein. When the liquid cooling system starts to work, the first temperature sensor 3 can sense the change of the ambient temperature outside the shell 1 and convert the sensed temperature into an available output signal to send to the controller 4, and the controller 4 obtains the ambient temperature according to the signal to control the liquid flow in the flow path. In the embodiment, the first temperature sensor 3 can monitor the ambient temperature outside the shell 1 in real time to control the flow, or can monitor the ambient temperature outside the shell 1 every interval t to control the flow, and t can be 0.5h-2.5h, such as 0.5h, 1h, 1.5h, 2h, 2.5h, etc.

[0023] Please refer to Figure 4 The flow path includes a main path 21 and a first branch path 22 and a second branch path 23. The first branch path 22 and the second branch path 23 are in parallel, the first branch path 22 is in series with the main path 21, and the second branch path 23 is in series with the main path 21. The liquid cooling system has a heat exchange working state, in which the first heat exchanger 212 is configured to exchange heat with the power module, the first temperature sensor 3 is configured to monitor the ambient temperature outside the shell 1, and the controller 4 controls the liquid flow into the first branch path 22 and / or the second branch path 23 according to the ambient temperature outside the shell 1 monitored by the first temperature sensor 3.

[0024] When the first temperature sensor 3 monitors that the ambient temperature outside the shell 1 is less than or equal to a set temperature T1, the controller 4 controls the first branch path 4 to guide the liquid in the main path 21 to completely flow into the first branch path 22. When the first temperature sensor 3 monitors that the ambient temperature outside the shell 1 is greater than the set temperature T1 and less than or equal to a set temperature T3, the controller 4 guides x% of the liquid in the main path 21 to flow into the second branch path 23, and the rest of the liquid to flow into the first branch path 22, wherein 20≤x≤75. When the first temperature sensor 3 monitors that the ambient temperature outside the shell 1 is greater than the set temperature T3, the controller 4 guides the liquid in the main path 21 to completely flow into the second branch path 23. In the embodiment, the values of T1 and T3 can be set according to requirements, and preferably T1 is (25±5)℃, and T3 is (45±5)℃.

[0025] More specifically, when the first temperature sensor 3 monitors that the ambient temperature outside the shell 1 is greater than the set temperature T1 and less than or equal to the set temperature T2, the controller 4 controls the first branch 22 and the second branch 23, the controller 4 controls the x' % liquid in the main path 21 to flow into the second branch 23, wherein 20≤x'≤50, and the controller 4 controls the remaining liquid in the main path 21 to flow into the first branch 22. In this embodiment, the value of T2 can be set according to requirements, and preferably T2 is (35±3) °C.

[0026] The main path 21 comprises a liquid pump 211 and a first heat exchanger 212. The liquid pump 211 and the first heat exchanger 212 are connected in series, and the first heat exchanger 212 is located beside the power module. In the embodiment of the application, the inlet end of the first heat exchanger 212 communicates with the outlet end of the liquid pump 211. The outlet end of the first heat exchanger 212 communicates with the inlet end of the first branch 22 and the inlet end of the second branch 23. The outlet end of the first branch 22 and the outlet end of the second branch 23 both communicate with the inlet end of the liquid pump 211. The liquid pump 211 provides power for the liquid flow, so that the liquid can flow in the flow path in the set direction. In other embodiments, the liquid pump 211 can also be arranged at the outlet end of the first heat exchanger 212, which is not limited here. Preferably, the liquid pump 211 is a water pump. The liquid is a mixture of ethylene glycol and water in a certain proportion, for example, ethylene glycol and water are mixed in a ratio of 1:1 to form an antifreeze liquid (the working temperature of the antifreeze liquid under this ratio is minus 30 °C to 50 °C, which can meet the normal operation of the liquid charging liquid cooling system under normal environment), the concentration of the liquid can be adjusted according to actual requirements, and the working temperature changes with the change of the concentration. The water pump provides power for the antifreeze liquid in the flow path, so that it can flow in the flow path in the set direction and flow into the first heat exchanger 212 for heat exchange.

[0027] Please refer to Figure 3 The power module comprises at least two, and the first heat exchanger 212 comprises at least two. Each first heat exchanger 212 is arranged beside each power module, and each first heat exchanger 212 exchanges heat with each power module, so that each power module can be quickly cooled. Preferably, the first heat exchangers 212 are arranged in parallel with each other, and along the transverse direction (i.e. the horizontal direction) of the shell 1, the first heat exchangers 212 are divided into two rows, when the first heat exchangers 212 have multiple, the first heat exchangers 212 in each row are distributed equidistantly along the height direction (i.e. the vertical direction) of the shell 1, i.e. each first heat exchanger 212 is arranged in a branch path, so that the resistance of each branch path is the same, thereby making the flow distribution of each branch path uniform, and ensuring that each power module is well cooled. The third branch 24 is further arranged between the first heat exchanger 212 and the main path 21, and the liquid in the main path 21 is uniformly distributed to each first heat exchanger 212 through each third branch 24, so that each power module can be uniformly and simultaneously cooled.

[0028] Preferably, the main path 21 comprises an exhaust valve 50, which is in series with the first heat exchanger 212. In some embodiments, the exhaust valve 50 is arranged between two rows of the first heat exchanger 212. In the process of heat exchange between each first heat exchanger 212 and each power module, the liquid is prone to expand and vaporize when heated. By arranging the exhaust valve 50, the gas pressure in the flow path can be controlled to ensure the safety of the operation of the liquid cooling system.

[0029] Please refer to Figure 3 The main path 21 further comprises a plurality of flow regulating valves 215, which are arranged at the inlet ends of each first heat exchanger 212, respectively, to control the flow of liquid into each first heat exchanger 212. Specifically, the greater the opening degree of the flow regulating valve 215, the greater the flow of liquid into the first heat exchanger 212, and the higher the heat exchange efficiency of each first heat exchanger 212. Conversely, the smaller the opening degree of the flow regulating valve 215, the smaller the flow of liquid into the first heat exchanger 212, and the smaller the heat exchange rate of each first heat exchanger 212. By arranging the flow regulating valve 215, the heat exchange rate of each first heat exchanger 212 can be controlled, so as to match and adjust the heat exchange rate of each power module. In the embodiments of the present application, the first heat exchanger 212 is a liquid cooling plate, and the flow regulating valve 215 is a ball valve. The ball valve can be controlled by the controller 4 or manually controlled, which is not limited herein.

[0030] Please refer to Figures 4 to 6 The second branch path 23 comprises a second heat exchanger 231. In the embodiments of the present application, the second heat exchanger 231 is a micro-channel heat exchanger. The micro-channel heat exchanger is a heat exchange component with high internal flow resistance. If the liquid is always passed through the micro-channel heat exchanger, the liquid pump 211 will be in a long-term high-load working condition, which will consume a large amount of energy. Therefore, the controller 4 needs to monitor the ambient temperature outside the housing 1 according to the first temperature sensor 3, control and adjust the flow of liquid into the first branch path 22 and the second branch path 23, and avoid the situation that the liquid always passes through the heat exchanger at low temperature. When the ambient temperature is low and the system requires a small amount of cooling, more antifreeze liquid does not pass through the second heat exchanger 231 of the second branch path 23 but passes through the bypass first branch path 22, so as to reduce the lift burden of the liquid pump 211 and achieve the purpose of energy saving.

[0031] Please refer to Figures 4 to 6The charging liquid cooling system further comprises a fan 30 arranged in the shell 1 and beside the second heat exchanger 231. An air outlet surface of the fan 30 faces the second heat exchanger 231, and the fan 30 is electrically connected to the controller 4. When liquid flows into the second heat exchanger 231 and the second heat exchanger 231 needs to improve heat exchange efficiency to meet the heat dissipation requirement of the power module, the controller 4 controls the fan 30 to operate to improve the heat exchange efficiency of the second heat exchanger 231. When liquid flows into the second heat exchanger 231 and the fan 30 does not need to operate to meet the heat dissipation requirement of the power module, the fan 30 is not started to save energy. At the same time, the fan 30 drives the surrounding low-temperature air to blow to the second heat exchanger 231, and a natural cold source is adopted, which also has the effect of saving energy compared with a cold source obtained by using a refrigeration system.

[0032] Please refer to Figures 4 to 6 The charging liquid cooling system further comprises an adjusting valve 5. The adjusting valve 5 is arranged in at least one of the first branch 22 and the second branch 23, or two connecting positions of the first branch 22, the second branch 23 and the main line 21, and at least one of the two connecting positions is provided with the adjusting valve 5. The adjusting valve 5 is electrically connected to the controller 4. In the heat exchange working state, the controller 4 controls the adjusting valve 5 to adjust the liquid flow entering the first branch 22 and / or the second branch 23 according to the ambient temperature outside the shell 1 monitored by the first temperature sensor 3.

[0033] Please refer to Figure 4In the first embodiment, the regulating valve 5 is a three-way valve, which is electrically connected with the controller 4. In the application scenario of the present application, the regulating valve 5 includes one inlet 51 and two outlets 52, 53 (i.e. the regulating valve 5 is a split three-way valve). The inlet 51 is in communication with the outlet end of the main path 21. Of the two outlets 52, 53 of the regulating valve 5, one outlet 52 is in communication with the inlet end of the first branch path 22, and the other outlet 53 is in communication with the inlet end of the second branch path 23. The outlet end of the first branch path 22 and the outlet end of the second branch path 23 are both in communication with the inlet end of the main path 21. Specifically, when the first temperature sensor 3 monitors that the natural temperature outside the shell 1 is less than or equal to (25±5)℃ (i.e. the natural temperature T≤(25±5)℃), the controller 4 controls the regulating valve 5 to open the outlet 52 and close the outlet 53, so that the liquid in the main path 21 completely flows into the first branch path 22. Without passing through the second heat exchanger 231, the liquid in the flow path can be ensured to flow normally to dissipate heat for the power module without increasing the working load of the liquid pump 211, and the working load of the liquid pump 211 is the smallest at this time. When (25±5)℃<(natural temperature T≤(35±3)℃, the controller 4 controls the regulating valve 5 to open the outlets 52 and 53, so that (20-50)% of the liquid in the main path 21 flows into the second branch path 23. At this time, part of the liquid in the main path 21 flows into the first branch path 22, and the other part flows into the second branch path 23 to exchange heat with the second heat exchanger 231. Compared with the liquid completely flowing into the second branch path 23, the working load of the liquid pump 211 can be reduced, and the power module can be ensured to dissipate heat. When (35±3)℃<(natural temperature T≤(45±5)℃, the controller 4 controls the regulating valve 5 to open the outlets 52 and 53, so that (50-75)% of the liquid in the main path 21 flows into the first branch path 22, and the remaining liquid flows into the second branch path 23. At this time, most of the liquid in the main path 21 flows into the second branch path 23, and a small part of the liquid flows into the first branch path 22. Compared with the liquid completely flowing into the second branch path 23, the working load of the liquid pump 211 can be reduced, and the power module can be ensured to dissipate heat. When the first temperature sensor 3 monitors that the natural temperature outside the shell 1 is greater than (45±5)℃, the controller 4 controls the regulating valve 5 to close the outlet 52 and open the outlet 53, so that the liquid in the main path 21 completely flows into the second branch path 23. At the same time, the controller 4 controls the air blower 30 to blow air to the second heat exchanger 231 to speed up heat exchange of the second heat exchanger 231. At this time, the working load of the liquid pump 211 is the largest. The controller 4 controls the opening and closing of the two outlets 52, 53 of the regulating valve 5 at different natural temperatures, thereby reducing the lift burden of the liquid pump 211 and making the charging liquid cooling system more energy-saving.

[0034] Please refer to Figure 6In other application scenarios of the present application, the regulating valve 5 is a three-way valve, and the regulating valve 5 includes two inlets 51', 52' and one outlet 53' (i.e., the regulating valve 5 is a converging three-way valve). The outlet 53' is in communication with the inlet end of the main path 21, and of the two inlets 51', 52' of the regulating valve 5, one inlet 51' is in communication with the outlet end of the first branch path 22, and the other inlet 52' is in communication with the outlet end of the second branch path 23, and the inlet end of the first branch path 22 and the inlet end of the second branch path 23 are both in communication with the outlet end of the main path 21. Specifically, when the first temperature sensor 3 monitors that the natural temperature outside the shell 1 is less than or equal to (25±5)℃ (i.e., the natural temperature T≤(25±5)℃), the controller 4 controls the regulating valve 5 to open the inlet 51' and close the inlet 52', so that the liquid flowing out of the outlet end of the first heat exchanger 212 completely flows back to the liquid pump 211 through the first branch path 22, and at this time, the working load of the liquid pump 211 is the smallest. When (25±5)℃<(natural temperature T≤(35±3)℃, the controller 4 controls the regulating valve 5' to open the inlet 51' and the inlet 52', so that (20-50)% of the liquid flowing out of the outlet end of the first heat exchanger 212 flows into the first branch path 22, and the remaining liquid flowing out of the outlet end of the first heat exchanger 212 flows into the second branch path 23, and then flows back to the liquid pump 211. When (35±3)℃<(natural temperature T≤(45±5)℃, the controller 4 controls the regulating valve 5' to open the inlet 51' and the inlet 52', so that (50-75)% of the liquid flowing out of the outlet end of the first heat exchanger 212 flows into the first branch path 22, and the remaining liquid flowing out of the outlet end of the first heat exchanger 212 flows into the second branch path 23, and then flows back to the liquid pump 211. When the first temperature sensor 3 monitors that the natural temperature outside the shell 1 is greater than (45±5)℃, the controller 4 controls the regulating valve 5' to close the inlet 51' and open the inlet 52', so that the liquid flowing out of the outlet end of the first heat exchanger 212 completely flows back to the liquid pump 211 through the second branch path 23, and at this time, the working load of the liquid pump 211 is the largest. The controller 4 controls the opening and closing of the two inlets 51', 52' of the regulating valve 5' at different natural temperatures, reduces the flow resistance of the liquid in the flow path, thereby reducing the lift burden of the liquid pump 211, and makes the flow path more energy-saving.

[0035] Please combine Figures 1 to 6In the second embodiment (not shown), the regulating valve is a two-way valve. In the first application scenario, the two-way valve has two, one of which is arranged on the first branch 22, and the other of which is arranged on the second branch 23, and the two two-way valves are respectively electrically connected to the controller 4. The controller 4 controls the on-off of the two two-way valves according to the natural temperature outside the shell 1 monitored by the first temperature sensor 3, so as to adjust the liquid flow rate of the liquid in the main path 21 flowing into the first branch 22 and the second branch 23. In the second application scenario, the two-way valve is arranged on the first branch 22 or the second branch 23, and the two-way valve is electrically connected to the controller 4. The controller 4 controls the on-off of the two-way valve according to the natural temperature outside the shell 1 monitored by the first temperature sensor 3, so as to adjust the liquid flow rate of the liquid in the main path 21 flowing into the first branch 22 or the second branch 23. The control strategy of the two-way valve is the same as that in the first embodiment, and will not be described herein again.

[0036] In other embodiments, the inlet end of the first branch 22, the inlet end of the second branch 23, and the outlet end of the main path 21 are provided with a split three-way valve, and the outlet end of the first branch 22, the outlet end of the second branch 23, and the inlet end of the main path 21 are provided with a merge three-way valve, and the control strategy is the same as that in the first embodiment, and will not be described herein again.

[0037] Please refer to Figures 4 to 6The main path 21 further comprises a second temperature sensor 6 and a third temperature sensor 7, and the second temperature sensor 6 and the third temperature sensor 7 are arranged in the shell 1. The second temperature sensor 6 is arranged close to the inlet end of the first heat exchanger 212, and the second temperature sensor 6 is configured to measure the inlet liquid temperature of the first heat exchanger 212. The second temperature sensor 6 is electrically connected to the controller 4. The third temperature sensor 7 is arranged close to the outlet end of the first heat exchanger 212, and the third temperature sensor 7 is configured to measure the outlet liquid temperature of the first heat exchanger 212. The third temperature sensor 7 is electrically connected to the controller 4. Specifically, when the controller 4 controls the liquid to flow into the second heat exchanger 231, the second temperature sensor 6 can detect whether the heat exchange of the second heat exchanger 231 is normal. When the second temperature sensor 6 monitors that the inlet liquid temperature is close to the outlet liquid temperature monitored by the third temperature sensor 7, it indicates that the heat exchange rate of the flow path is low. The first processing mode is that the controller 4 starts the fan 30 or the controller 4 controls the regulating valve 5 to increase the flow through the second branch 23, so as to reduce the heat of the flow path by improving the heat exchange efficiency of the second heat exchanger 231, thereby ensuring the normal operation of the liquid cooling system. If the first processing mode is adopted, and the second temperature sensor 6 still monitors that the inlet liquid temperature is close to the outlet liquid temperature monitored by the third temperature sensor 7, it indicates that the second heat exchanger 231 may have an abnormality. The second processing mode is adopted, specifically: the controller 4 prompts the engineering personnel to check whether the second heat exchanger 231 is in an abnormal state, and if the abnormality occurs, the second heat exchanger 231 is repaired or replaced in time, so as to ensure the normal operation of the flow path. If the second temperature sensor 6 monitors that the inlet liquid temperature is close to the ambient temperature, it indicates that the liquid cooling system operates normally.

[0038] Please refer to Figures 4 to 6 The liquid cooling system further comprises an expansion tank 213 and a one-way valve 214, the one-way valve 214 is connected in series with the liquid pump 211, the expansion tank 213 is connected with the main path 21, and the access end of the expansion tank 213 is close to the inlet end of the liquid pump 211. In this embodiment, the access end of the expansion tank 213 is communicated with the inlet end of the liquid pump 211. The inlet end of the one-way valve 214 is communicated with the outlet end of the liquid pump 211, and the outlet end of the one-way valve 214 is communicated with the inlet end of the first heat exchanger 212. Preferably, the expansion tank 213 is an expansion water tank. The use of the expansion water tank can ensure that the volume of the liquid is expanded at low temperature, thereby reducing the risk of explosion of the flow path and improving the safety. The one-way valve 214 is arranged between the liquid pump 211 and the first heat exchanger 212, so as to ensure that the liquid in the flow path does not backflow. The liquid cooling system further comprises a liquid discharge branch, and the access end of the liquid discharge branch is arranged between the one-way valve 214 and the first heat exchanger 212. The liquid discharge branch is provided with a liquid discharge valve 40. When the liquid medium in the flow path is too much, the excess liquid medium can be discharged through the liquid discharge valve 40 when flowing through the liquid discharge valve 40, so as to balance the liquid pressure in the flow path.

[0039] Please refer to Figures 4 to 6, the charging liquid cooling system further comprises a liquid supplement branch 8, the liquid supplement branch 8 is connected with the main branch 21, an inlet end of the liquid supplement branch 8 is arranged outside the main branch 21, and an outlet end of the liquid supplement branch 8 is arranged before an inlet end of the liquid pump 211. A stop valve 9 is arranged on the liquid supplement branch 8, and the stop valve 9 controls opening and closing of the liquid supplement branch 8. In the embodiment, the outlet end of the liquid supplement branch 8 is arranged before an access end of the first expansion tank 213. By arranging the liquid supplement branch 8, liquid in the flow path can be supplemented conveniently and timely, the outlet end of the liquid supplement branch 8 is arranged before the inlet end of the first expansion tank 213, and when liquid is supplemented, part of the supplemented liquid can first enter the first expansion tank 213 to be stored, so that liquid in the flow path can be kept stable.

[0040] Please refer to Figures 4 to 6 , the charging liquid cooling system further comprises a filter 10, the filter 10 is arranged between the outlet end of the liquid supplement branch 8 and the access end of the first expansion tank 213. Preferably, the filter 10 is a Y-type filter, and the Y-type filter is adopted to filter impurities in the liquid in the flow path, effectively reduce wear of the liquid pump 211 caused by the impurities, and prevent the impurities from causing blockage of small passages in the first heat exchanger 212 and the second heat exchanger 231, thereby affecting cooling effect of the charging liquid cooling system.

[0041] Please refer to Figures 4 to 6The charging liquid cooling system further comprises a heating module 20, at least one of the main circuit 21 and the first branch 22 comprises the heating module 20, and the heating module 20 is electrically connected to the controller 4. When the first temperature sensor 3 detects that the ambient temperature outside the shell 1 is less than a set temperature T0, the controller 4 controls the heating module 20 to start heating the liquid, wherein the set temperature T0 is the freezing point temperature of the liquid. In the first embodiment, the main circuit 21 comprises the heating module 20. Specifically, the heating module 20 is arranged between the one-way valve 214 and the second temperature sensor 6. When the ambient temperature outside is less than T0, that is, the first temperature sensor 3 detects that the ambient temperature outside the shell 1 is lower than T0, the controller 4 controls the heating module 20 to start heating the liquid, so as to reduce the freezing of the liquid in the flow path in the low-temperature environment and affect the normal operation of the charging liquid cooling system. In the second embodiment, the first branch 22 comprises the heating module 20. When the ambient temperature outside is less than T0, that is, the first temperature sensor 3 detects that the ambient temperature outside the shell 1 is lower than T0, the controller 4 controls the regulating valve 5 to make the liquid in the flow path pass through the first branch 22. Therefore, arranging the heating module 20 on the first branch 22 can also heat the liquid in the flow path, so as to reduce the freezing of the liquid in the flow path in the low-temperature environment and affect the normal operation of the charging liquid cooling system, and meanwhile, the lift of the liquid pump 211 is reduced, so as to achieve the purpose of energy saving. In the third embodiment, the heating module has two, and the main circuit 21 and the first branch 22 each comprise a heating module 20, and the two heating modules 20 are electrically connected to the controller 4. Arranging two heating modules 20 can further accelerate the heating of the liquid in the flow path, so as to ensure that the charging liquid cooling system can be started quickly and operated safely, and meanwhile, when one of the heating modules 20 fails, the other heating module 20 can ensure that the heat exchange work of the system is normally operated. Of course, in other embodiments, the second branch 23 can also comprise the heating module 20.

[0042] In the above embodiments, arranging the heating module 20 in the charging liquid cooling system can not only prevent the freezing of the liquid, but also ensure that the working temperature of the power module is within the normal working temperature range of the power module when the ambient temperature is lower than the minimum working temperature of the power module.

[0043] Please refer to Figures 4 to 5 Figures 4 to 6The charging liquid cooling system further comprises a plurality of stop valves 9 arranged on the flow path to control the opening and closing of the flow path. The first stop valve 9 is arranged between the liquid discharge valve 40 and the first heat exchanger 212, the second stop valve 9 is arranged between the first heat exchanger 212 and the first branch 22, the third stop valve 9 is arranged between the first branch 22 and the second branch 23, and the fourth stop valve 9 is arranged between the second heat exchanger 231 and the inlet end of the liquid supplement branch 8. Each stop valve 9 is used to control the opening and closing of the flow path, facilitating the daily maintenance and repair of the charging liquid cooling system by maintenance personnel.

[0044] In summary, the charging liquid cooling system of the present application, by arranging the first temperature sensor 3 outside the shell 1 and the controller 4 on the shell 1, the controller 4 monitors the ambient temperature outside the shell 1 according to the first temperature sensor 3, controls the adjusting valve 5 to adjust the liquid flow into the first branch 22 and the second branch 23, when the ambient temperature is low and the system requires less cooling capacity, more antifreeze liquid does not pass through the second heat exchanger 231 of the second branch 23 but passes through the bypass first branch 22, avoiding the case that the liquid always passes through the heat exchanger at low temperature, thereby reducing the lift burden of the liquid pump 211, achieving the purpose of energy saving.

[0045] The above embodiments are only used to illustrate the present application and not to limit the technical solutions described in the present application. The understanding of the specification should be based on the technical personnel in the technical field, for example, the directional description of "front", "back", "left", "right", "up", "down" and the like. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical personnel in the technical field can still modify or equivalently replace the present application, and all technical solutions and improvements that do not deviate from the spirit and scope of the present application should be covered within the scope of the claims of the present application.

Claims

1. A liquid cooling system for charging piles, for heat exchange of power modules in a charging pile shell, characterized in that: The charging liquid cooling system comprises a flow path, a first temperature sensor and a controller, the flow path comprises a main path, a first branch and a second branch, the first branch and the second branch are in parallel, the first branch is in series with the main path, and the second branch is in series with the main path; the main path comprises a liquid pump and a first heat exchanger, the liquid pump and the first heat exchanger are in series, and the first heat exchanger is used for heat exchange of the power module; the second branch comprises a second heat exchanger; The first temperature sensor is at least partially arranged outside the shell, and the first temperature sensor is electrically connected with the controller; The charging liquid cooling system comprises an adjusting valve, at least one of the first branch and the second branch is provided with the adjusting valve; or the first branch, the second branch and the main path have two connecting positions, at least one of the connecting positions is provided with the adjusting valve, and the adjusting valve is electrically connected with the controller; The charging liquid cooling system has a heat exchange working state, in the heat exchange working state, the first heat exchanger exchanges heat with the power module, and the controller controls the adjusting valve to adjust the liquid flow entering the first branch and / or the second branch according to the ambient temperature monitored by the first temperature sensor; In the heat exchange working state, when the ambient temperature monitored by the first temperature sensor is less than or equal to a set temperature T1, the controller controls the first branch to guide the liquid in the main path to completely flow into the first branch; When the ambient temperature monitored by the first temperature sensor is greater than the set temperature T1 and less than or equal to a set temperature T3, the controller controls the adjusting valve to guide part of the liquid in the main path to flow into the second branch; When the ambient temperature monitored by the first temperature sensor is greater than the set temperature T3, the controller controls the adjusting valve to guide the liquid in the main path to completely flow into the second branch.

2. The charging liquid cooling system of claim 1, wherein: When the ambient temperature monitored by the first temperature sensor is greater than the set temperature T1 and less than or equal to the set temperature T3, the controller controls the adjusting valve to guide x% of the liquid in the main path to flow into the second branch, wherein 20≤x≤75; Wherein, T1=(25±5)℃, T3=(45±5)℃.

3. The liquid charging system of claim 2, wherein: In the heat exchange working state, when the ambient temperature monitored by the first temperature sensor is greater than the set temperature T1 and less than or equal to a set temperature T2, the controller controls the adjusting valve to guide x'% of the liquid in the main path to flow into the second branch, wherein 20≤x'≤50; When the ambient temperature monitored by the first temperature sensor is greater than the set temperature T2 and less than or equal to the set temperature T3, the adjusting valve guides x''% of the liquid in the main path to flow into the second branch, wherein 50<x''≤75; Wherein, T2=(35±3)℃.

4. The liquid charging system of claim 2, wherein: The regulating valve is a three-way valve, the regulating valve includes one inlet and two outlets, the inlet is communicated with the outlet end of the main path, one of the two outlets of the regulating valve is communicated with the inlet end of the first branch path, and the other outlet is communicated with the inlet end of the second branch path, and the outlet end of the first branch path and the outlet end of the second branch path are both communicated with the inlet end of the main path. Alternatively, the regulating valve is a three-way valve, the regulating valve includes two inlets and one outlet, the outlet is communicated with the inlet end of the main path, one of the two inlets of the regulating valve is communicated with the outlet end of the first branch path, and the other inlet is communicated with the outlet end of the second branch path, and the inlet end of the first branch path and the inlet end of the second branch path are both communicated with the outlet end of the main path. Alternatively, the regulating valve is a two-way valve, at least one of the first branch path and the second branch path is provided with the regulating valve.

5. The liquid charging system of claim 1, wherein: The charging liquid cooling system further comprises a second temperature sensor, the second temperature sensor is arranged near the inlet end of the first heat exchanger, the second temperature sensor is configured to monitor the inlet temperature of the first heat exchanger, and the second temperature sensor is electrically connected with the controller. The charging liquid cooling system further comprises a third temperature sensor, the third temperature sensor is arranged near the outlet end of the first heat exchanger, the third temperature sensor is configured to monitor the outlet temperature of the first heat exchanger, and the third temperature sensor is electrically connected with the controller.

6. The liquid charging system of claim 1, wherein: The charging liquid cooling system further comprises an expansion tank and a one-way valve, the one-way valve is connected in series with the liquid pump, the expansion tank is connected with the main path, and the access end of the expansion tank is close to the inlet end of the liquid pump. The charging liquid cooling system further comprises a liquid supplement branch path, the liquid supplement branch path is connected with the main path, the inlet end of the liquid supplement branch path is arranged outside the main path, the outlet end of the liquid supplement branch path is arranged before the inlet end of the liquid pump, the liquid supplement branch path is provided with a stop valve, and the stop valve controls the opening and closing of the liquid supplement branch path.

7. The liquid charging system of claim 6, wherein: The main path comprises a filter, the filter is arranged between the outlet end of the liquid supplement branch path and the access end of the expansion tank.

8. The liquid charging system of claim 2, wherein: At least one of the main path and the first branch path comprises a heating module, and the heating module is electrically connected with the controller. In the heat exchange working state, when the ambient temperature monitored by the first temperature sensor is less than or equal to the set temperature T0, the controller controls the heating module to start heating the liquid, wherein the set temperature T0 is the freezing point temperature of the liquid.

9. The liquid charging system of claim 1, wherein: The power module includes at least two, the first heat exchanger includes at least two, the first heat exchanger is correspondingly arranged beside the power module, and the first heat exchangers are arranged in parallel with each other; the main path further comprises a plurality of flow regulating valves, the inlet end and / or the outlet end of the first heat exchanger is provided with the flow regulating valve, and the flow regulating valve controls the liquid flow in the first heat exchanger.

10. The liquid charging system of claim 1, wherein: The charging liquid cooling system further comprises a fan, the fan is located beside the second heat exchanger, the fan is configured to dissipate heat for the second heat exchanger, and the fan is electrically connected with the controller.

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