Battery liquid cooling system and method for filling antifreeze liquid in battery liquid cooling system

Abstract

The invention discloses a battery liquid cooling system and a method for filling antifreeze in the battery liquid cooling system. The battery liquid cooling system comprises a cooling unit, an antifreeze filling tank and at least one exhaust pipe, the cooling unit comprises a circulation pipeline and a water pump, the liquid chamber of the antifreeze filling tank and the water pump are sequentially connected in series on the circulation pipeline along the circulation direction of the fluid, the air inlet of each exhaust pipe is connected to the circulation pipeline, and a first control valve is connected in series on the circulation pipeline upstream of the antifreeze filling tank. By connecting the first control valve in series on the circulation pipeline upstream of the antifreeze filling tank, the efficiency of antifreeze filling is accelerated. The method for filling antifreeze in the battery liquid cooling system closes the first control valve, connects the exhaust pipe, exhausts the exhaust pipe to the outside, starts the water pump, and under the action of the water pump, the antifreeze filling tank fills the antifreeze into the circulation pipeline, after a period of filling, disconnects the exhaust pipe, and after the liquid level in the antifreeze filling tank no longer drops, opens the first control valve to complete the filling of the antifreeze.

Description

Technical Field

[0001] The invention belongs to the field of electric vehicles, and in particular relates to a battery liquid cooling system and a method for filling antifreeze liquid in the battery liquid cooling system. Background Art

[0002] At present, more and more pure electric buses use air-conditioning liquid cooling instead of traditional air cooling to dissipate battery heat. By dissipating the heat of the battery, the battery loss rate can be reduced and the battery service life can be increased. Most of the battery air-conditioning water tanks are arranged on the roof. When the antifreeze is added to the water system for the first time, it is necessary to manually add it on the roof. Because the water channel is long, the water resistance is large, and the automatic exhaust efficiency is slow, a large amount of gas is stored in the water channel, which affects the filling efficiency. As a result, it usually takes 2 hours to fill a car with antifreeze. The efficiency is too low, affecting the efficiency of the whole vehicle off-line.

[0003] In view of this, the present invention is proposed. Summary of the invention

[0004] The first technical problem to be solved by the present invention is to overcome the technical problems in the prior art and provide a battery liquid cooling system and a method for filling antifreeze liquid in the battery liquid cooling system, so as to achieve the purpose of improving the filling efficiency of the antifreeze liquid.

[0005] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0006] According to one aspect of the present invention, there is provided a battery liquid cooling system, comprising a cooling unit, an antifreeze filling tank and at least one exhaust pipe, the cooling unit comprising a circulation pipeline and a water pump, the liquid chamber of the antifreeze filling tank and the water pump are sequentially connected in series on the circulation pipeline along the circulation direction of the fluid, the air inlet of each exhaust pipe is connected to the circulation pipeline, and a first control valve is serially connected on the circulation pipeline upstream of the antifreeze filling tank.

[0007] Furthermore, the system includes a first exhaust pipe and a second exhaust pipe; the air inlet of the first exhaust pipe is serially connected to the circulation pipeline located upstream of the first control valve, and the air inlet of the second exhaust pipe is serially connected to the circulation pipeline located downstream of the water pump.

[0008] Furthermore, the cooling unit also includes a heat exchanger connected in series to the circulation pipeline downstream of the water pump; the air inlet of the second exhaust pipe is connected in series to the circulation pipeline between the downstream of the heat exchanger and the upstream of the first exhaust pipe.

[0009] Furthermore, the cooling unit also includes a battery connected in series to the circulation pipeline located between the downstream of the heat exchanger and the upstream of the first exhaust pipe; the air inlet of the second exhaust pipe is connected in series to the circulation pipeline located between the downstream of the heat exchanger and the upstream of the battery.

[0010] Furthermore, a power exhaust device is serially connected to the first exhaust pipe and / or the second exhaust pipe.

[0011] Furthermore, a second control valve is connected in series to the circulation pipeline, and the air inlet of the first exhaust pipeline and the air inlet of the second exhaust pipeline are connected in series to the circulation pipeline via the second control valve.

[0012] Furthermore, the system also includes two third exhaust pipes, an air inlet of one third exhaust pipe is serially connected to the circulation pipeline between the downstream of the first exhaust pipe and the upstream of the first control valve, and an air inlet of the other third exhaust pipe is serially connected to the circulation pipeline between the downstream of the water pump and the upstream of the heat exchanger, and the air outlets of the two third exhaust pipes are connected to the gas chamber of the antifreeze filling tank.

[0013] Furthermore, the two third exhaust pipes are connected in series with a third control valve.

[0014] The present invention also provides a method for filling antifreeze in a battery liquid cooling system. The battery liquid cooling system provided by the above technical solution is adopted, the first control valve is closed, the exhaust pipe is connected, the exhaust pipe exhausts air outwards, and the water pump is turned on. Under the action of the water pump, the antifreeze filling tank fills the antifreeze into the circulation pipeline. After filling for a period of time, the exhaust pipe is disconnected, and when the liquid level in the antifreeze filling tank no longer drops, the first control valve is opened to complete the filling of the antifreeze.

[0015] Further, after closing the first control valve, the exhaust power devices on the first exhaust pipe and the second exhaust pipe are turned on, the first exhaust pipe and the second exhaust pipe are connected, the third exhaust pipe is disconnected, and the first exhaust pipe and the second exhaust pipe are exhausted to the outside;

[0016] Preferably, after the first control valve is opened, the water pump continues to operate until the circulation pipeline is filled with antifreeze liquid.

[0017] The present invention also provides an electric vehicle, comprising the battery liquid cooling system provided by the above technical solution.

[0018] After adopting the above technical scheme, the present invention has the following beneficial effects compared with the prior art.

[0019] 1. A first control valve is connected in series on the circulation pipeline. When adding liquid, the first control valve is in a closed state and the exhaust pipe is in a connected state, ensuring that the liquid entering the water pump is all liquid without gas. The water pump can run at full speed without idling. The full-speed operation of the water pump speeds up the efficiency of adding antifreeze from the antifreeze filling tank into the circulation pipeline. After the antifreeze is added, disconnect the exhaust pipe, open the first control valve, and restore normal pipeline circulation.

[0020] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the accompanying drawings:

[0022] Figure 1 is a schematic structural diagram of a battery liquid cooling system provided by an embodiment of the present invention;

[0023] Figure 2 is a schematic structural diagram of a battery liquid cooling system provided by another embodiment of the present invention;

[0024] Figure 3 The present invention is a flowchart of a method for filling antifreeze fluid in a battery cooling system provided by an embodiment of the present invention.

[0025] In the figure: 1-cooling unit; 11-circulation pipeline; 111-second control valve; 12-heat exchanger; 13-water pump; 16-battery; 17-first control valve; 2-antifreeze filling tank; 3-exhaust pipe; 31-first exhaust pipe; 32-second exhaust pipe; 33-exhaust power device; 331-electric exhaust pump; 34-third exhaust pipe; 341-third control valve.

[0026] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0028] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Example

[0031] like Figure 1 and Figure 2 As shown, the present invention provides a battery liquid cooling system, including a cooling unit 1, an antifreeze filling tank 2 and at least one exhaust pipe 3, the cooling unit 1 includes a circulation pipeline 11 and a water pump 13, the liquid chamber of the antifreeze filling tank 2 and the water pump 13 are connected in series to the circulation pipeline 11 in sequence along the circulation direction of the fluid, the air inlet of each exhaust pipe 3 is connected to the circulation pipeline 11, and a first control valve is connected in series to the circulation pipeline 11 located upstream of the antifreeze filling tank 2.

[0032] In the embodiment of the present invention, for the battery liquid cooling system, the liquid cavity of the antifreeze filling tank 2 is filled with antifreeze into the circulation pipeline 11 through the pipeline. Before the antifreeze filling tank 2 fills the circulation pipeline 11 with antifreeze, the first control valve 17 is closed, the exhaust pipe 3 is connected to discharge the gas remaining in the circulation pipeline 11 to the outside, and the antifreeze is added to the circulation pipeline 11. Since the first control valve 17 is in a closed state and the exhaust pipe is in a connected state, it is ensured that the liquid inlet of the water pump 13 is all liquid without mixed gas, and the water pump 13 can run at full speed without idling. The full speed operation of the water pump 13 speeds up the efficiency of the antifreeze filling tank 2 to add antifreeze into the circulation pipeline 11. After the antifreeze is added, the exhaust pipe 3 is disconnected, the first control valve 17 is opened, and the normal pipeline circulation is restored;

[0033] The antifreeze filling tank 2 is used to fill and contain antifreeze, and has a liquid side and a gas side. The liquid side of the antifreeze filling tank 2 is provided with a liquid cavity capable of containing antifreeze, and the gas side thereof is provided with a gas cavity connected to the outside. The antifreeze filling tank 2 can fill the antifreeze into the cooling unit 1 through the liquid cavity, and the exhaust pipe 3 can discharge the gas in the cooling unit 1 to the outside by being connected to the gas cavity. The exhaust pipe 3 can also be directly connected to the outside to discharge the gas in the cooling unit 1 to the outside.

[0034] The circulation pipeline 11 of the cooling unit 1 is connected to an exhaust pipe or two or more exhaust pipes 3. Preferably, the circulation pipeline 11 of the cooling unit 1 is provided with two or more exhaust pipes 3 to accelerate the exhaust efficiency of the gas.

[0035] It should be noted that the liquid cavity of the antifreeze filling tank 2 is used to store and fill antifreeze; if the exhaust pipe 3 is connected to the gas cavity of the antifreeze filling tank 2, the gas cavity of the antifreeze filling tank 2 is a cavity having one end connected to the outside and the other end connected to the exhaust pipe 3; the battery liquid cooling system is applied to electric equipment to cool the power supply device on the electric equipment, the electric equipment may be an electric vehicle, and the power supply device may be a battery 16;

[0036] The water pump 13 is turned on or off by the control system on the electric vehicle. The water pump 13 is wirelessly connected to the control system to avoid the situation where the wires are messy and easy to leak in a humid environment due to the wired connection between the two. The water pump 13 is connected to a wireless receiving module, and the control system is connected to a wireless transmitting module. The wireless receiving module and the wireless transmitting module are connected. The wireless receiving module can be a Bluetooth receiving module, and the wireless transmitting module can be a Bluetooth transmitting module.

[0037] like Figure 2 As shown, in an embodiment of the present invention, the system includes a first exhaust pipe 31 and a second exhaust pipe 32; the air inlet of the first exhaust pipe 31 is connected in series to the circulation pipeline 11 located upstream of the first control valve 17, and the air inlet of the second exhaust pipe 32 is connected in series to the circulation pipeline 11 located downstream of the water pump 13.

[0038] In an embodiment of the present invention, two exhaust pipes 3 are connected in series on the circulation pipeline 11 of the cooling unit 1, namely a first exhaust pipe 31 and a second exhaust pipe 32. The air inlet of the first exhaust pipe 31 is connected to the circulation pipeline 11, and the air outlet thereof is connected to the outside. The air inlet of the second exhaust pipe is connected to the circulation pipeline 11, and the air outlet thereof is connected to the outside. The air inlet of the first exhaust pipe 31 is located upstream of the first control valve 17, and the air inlet of the second exhaust pipe 32 is located downstream of the water pump 13, so that the first exhaust pipe 31 and the second exhaust pipe 32 are located on both sides of the first control valve 17. When the first control valve 17 is disconnected, the first exhaust pipe 31 and the second exhaust pipe 32 can discharge the gas of the circulation pipeline 11 located on both sides of the first control valve 17, thereby accelerating the exhaust of the gas.

[0039] like Figure 1 and Figure 2 As shown, in an embodiment of the present invention, the cooling unit 1 also includes a heat exchanger 12 connected in series to the circulation pipeline 11 located downstream of the water pump 13; the air inlet of the second exhaust pipe 32 is connected in series to the circulation pipeline 11 located between the downstream of the heat exchanger 12 and the upstream of the first exhaust pipe 31.

[0040] In the embodiment of the present invention, specifically, the cooling unit 1 includes a circulation pipeline 11, a water pump 13, a first control valve 17 and a heat exchanger 12. The liquid outlet of the antifreeze filling tank 2 is connected to the circulation pipeline 11 through a pipeline, and the antifreeze filling tank 2 fills the antifreeze into the circulation pipeline 11 through its own liquid outlet, thereby realizing the filling of the antifreeze of the entire battery 16 liquid system; the heat exchanger 12 is connected in series to the circulation pipeline 11, and is used to perform heat exchange cooling on the fluid in the circulation pipeline 11, so as to realize the cooling of the components to be cooled connected in series to the circulation pipeline 11, and the components to be cooled can be the battery 16 of the electric vehicle;

[0041] According to the direction of fluid circulation, the first control valve 17, the water pump 13, and the heat exchanger 12 are connected in series to the circulation pipeline 11 in sequence. The air inlet of the second exhaust pipe 32 is connected in series to the circulation pipeline 11 located between the downstream of the heat exchanger 12 and the upstream of the first exhaust pipe 31, and its air outlet is connected to the outside. The second exhaust pipe 32 is arranged close to the heat exchanger to facilitate the discharge of the gas in the heat exchanger 12; Figure 1 and Figure 2 As shown, the direction of the arrow is the direction of fluid circulation;

[0042] The heat exchanger 12 comprises: a plurality of heat exchanger fins arranged vertically, the bottom end surfaces of adjacent heat exchanger fins having different horizontal heights, the plurality of heat exchanger fins comprising a first heat exchanger fin and a plurality of second heat exchanger fins, the first heat exchanger fin being located in the middle of the heat exchanger 12, and the horizontal heights of the bottom end surfaces of the plurality of second heat exchanger fins located on the same side of the first heat exchanger fin gradually increasing or decreasing from the first heat exchanger fin to the end of the heat exchanger 12;

[0043] Multiple heat exchanger fins are arranged vertically, and the bottom end surfaces of adjacent heat exchanger fins have different horizontal heights. The condensation water or defrost water accumulated between the heat exchanger fins will be affected by air shear force, gravity and surface tension, as well as the gravitational force of the water column of the condensation water or defrost water at the bottom of the adjacent fin with a lower bottom end surface. Under the action of these four forces, the bottom of the fin with a higher bottom end surface flows to the bottom of the adjacent fin with a lower bottom end surface, thereby increasing the height of the water column accumulated between the fins with a lower bottom end surface, so that it is easy to flow out from the heat exchanger fins under the action of gravity. The condensed water or defrosted water will then flow down through the collecting pan of the heat exchanger 12, thereby improving the heat exchange performance, so that the condensed water or defrosted water will flow to the lowest fin on the bottom end surface step by step like going down a step, so that the condensed water or defrosted water at the bottom of the entire heat exchanger 12 will be concentrated on the lowest fin on the bottom end surface and continue to flow down, thereby greatly reducing the water accumulation at the bottom of the heat exchanger 12; the antifreeze filling tank 2 is connected to the circulation pipeline 11 through the filling pipeline, that is, the antifreeze comes out of the antifreeze filling tank and enters the circulation pipeline 11 through the filling pipeline.

[0044] like Figure 1 and Figure 2As shown, in an embodiment of the present invention, the cooling unit 1 also includes a battery 16 connected in series to the circulation pipeline 11 between the downstream of the heat exchanger 12 and the upstream of the first exhaust pipe 31; the air inlet of the second exhaust pipe 32 is connected in series to the circulation pipeline 11 between the downstream of the heat exchanger 12 and the upstream of the battery 16.

[0045] In an embodiment of the present invention, the cooling unit 1 is used to cool the battery 16; along the direction of fluid circulation, the first control valve 17, the antifreeze filling tank 2, the water pump 13, the heat exchanger 12 and the battery 16 are connected in series in sequence, and the air inlet of the second exhaust pipe 32 is connected in series to the circulation pipeline located downstream of the heat exchanger and upstream of the battery. The second exhaust pipe 32 is adjacent to the heat exchanger 12 and the battery 16, thereby accelerating the discharge of gas in the heat exchanger 12 and the battery 16.

[0046] like Figure 2 As shown, in the embodiment of the present invention, a power exhaust device is serially connected to the first exhaust pipe and / or the second exhaust pipe.

[0047] In the embodiment of the present invention, the first exhaust pipe 31 and the second exhaust pipe 32 are both connected in series with the exhaust power device 33, or the first exhaust pipe 31 is connected in series with the exhaust power device 33, and the second exhaust pipe 32 is not connected in series with the exhaust power device 33, or the first exhaust pipe 31 is not connected in series with the exhaust power device 33, and the second exhaust pipe 32 is connected in series with the exhaust power device 33;

[0048] It should be noted that when the first exhaust pipe 31 or the second exhaust pipe 32 is not connected in series with the exhaust power device, a control valve is provided on the first exhaust pipe 31 or the second exhaust pipe 32, and the control valve controls the first exhaust pipe 31 or the second exhaust pipe 32 to be opened or closed;

[0049] An exhaust power device 33 is connected in series to the exhaust pipe 3. The exhaust power device 33 accelerates the speed of gas discharge and improves the cleanliness of gas discharge. Due to the accelerated gas discharge speed and improved cleanliness of gas discharge, the speed of adding antifreeze to the cooling unit 1 is accelerated, thereby improving the efficiency of antifreeze filling.

[0050] The exhaust power device 33 includes an electric exhaust pump 331, which is turned on or off by a control system on the electric vehicle to realize the automation of exhaust of the battery liquid cooling system.

[0051] In an embodiment of the present invention, the cooling unit 1 also includes an inlet water temperature sensor connected in series on the circulation pipeline 11 located between the downstream of the water pump 13 and the upstream of the heat exchanger 12. On the basis of the above embodiment, specifically, the cooling unit 1 includes a circulation pipeline 11, a first control valve 17, a heat exchanger 12, a water pump 13, an inlet water temperature sensor 14 and a battery 16. The inlet water temperature sensor 14 connected in series on the circulation pipeline 11 can detect the inlet water temperature of the heat exchanger 12. The inlet water temperature sensor 14 is connected to the control system on the electric vehicle, and the inlet water temperature sensed by the inlet water temperature sensor 14 is obtained through the control system; along the direction of fluid circulation, the first control valve 17, the antifreeze filling tank 2, the water pump 13, the inlet water temperature sensor 14, the heat exchanger 12, and the battery 16 are connected in series in sequence.

[0052] In an embodiment of the present invention, the cooling unit 1 also includes a water outlet temperature sensor 15 connected in series to the circulation pipeline 11 between the downstream of the heat exchanger 12 and the upstream of the battery, and the air inlet of the second exhaust pipe 32 is connected in series to the circulation pipeline 11 between the downstream of the water outlet temperature sensor 15 and the upstream of the battery. On the basis of the above embodiments, specifically, the cooling unit 1 includes a circulation pipeline 11, a first control valve 17, a heat exchanger 12, a water pump 13, a water inlet temperature sensor 14, a water outlet temperature sensor 15 and a battery 16. The water outlet temperature sensor 15 connected in series to the circulation pipeline 11 can detect the water outlet temperature of the heat exchanger 12. The water outlet temperature sensor 15 is connected to the control system on the electric vehicle, and the water outlet temperature sensed by the water outlet temperature sensor 15 is obtained through the control system; along the direction of fluid circulation, the antifreeze filling tank 2, the first control valve 17, the water pump 13, the water inlet temperature sensor 14, the heat exchanger 12, the water outlet temperature sensor 15 and the battery 16 are connected in series in sequence, and the air inlet of the second exhaust pipe 32 is connected in series to the circulation pipeline 11 located downstream of the water outlet temperature sensor 15 and upstream of the battery 16, so as to further accelerate the speed of gas discharge in the system.

[0053] like Figure 1As shown, in the embodiment of the present invention, a second control valve 111 is also connected in series to the circulation pipeline 11 , and the air inlet of the first exhaust pipeline 31 and the air inlet of the second exhaust pipeline 32 are connected in series to the circulation pipeline via the second control valve 111 . In the embodiment of the present invention, the circulation pipeline 11 is connected in series with the second control valve 111 corresponding to the respective exhaust pipelines, the first exhaust pipe 31 is connected in series with the circulation pipeline 11 via one second control valve 111, and the second exhaust pipe 32 is connected in series with the circulation pipeline 11 via another second control valve 111. When not exhausting, the first exhaust pipe 31 and the second exhaust pipe 32 can be removed from the corresponding second control valve 111, and the second control valve 111 is in a closed state. When exhausting, the first exhaust pipe 31 and the second exhaust pipe 32 are installed on the corresponding second control valve, and the second control valve 111 is in a closed state. When the first exhaust pipe 31 and the second exhaust pipe 32 are both connected in series with the electric exhaust pump 331, the first exhaust pipe 31 and the second exhaust pipe 32 can share one electric exhaust pump 331, and the first exhaust pipe 31 and the second exhaust pipe 32 are detachably connected to the circulation pipeline 11, so that the first exhaust pipe 31, the second exhaust pipe 32 and the electric exhaust pump 331 are used for exhausting on the circulation pipeline 11 of other cooling units 1.

[0054] like Figure 1 and Figure 2 As shown, in an embodiment of the present invention, the system also includes two third exhaust pipes, an air inlet of one third exhaust pipe is serially connected to the circulation pipeline between the downstream of the first exhaust pipe and the upstream of the first control valve, and an air inlet of the other third exhaust pipe is serially connected to the circulation pipeline between the downstream of the water pump and the upstream of the heat exchanger, and the air outlets of the two third exhaust pipes are connected to the gas chamber of the antifreeze filling tank.

[0055] In an embodiment of the present invention, the system further includes two third exhaust pipes 34, which are used to assist the exhaust of the first exhaust pipe 31 and the second exhaust pipe 32. When necessary, the two third exhaust pipes 34 are connected to assist the first exhaust pipe 31 and the second exhaust pipe 32 to exhaust the system; specifically, one third exhaust pipe 34 is connected in series to the circulation pipeline 11 between the first exhaust pipe 31 and the first control valve 17, and the other third exhaust pipe 34 is connected in series to the circulation pipeline 11 between the water pump 13 and the heat exchanger 12. When the first control valve 17 is closed, the circulation pipeline 11 on both sides of the first control valve 17 is effectively discharged;

[0056] The outlets of the two third exhaust pipes 34 are connected to different sides of the antifreeze filling tank 2, so as to realize the rationalization of the installation layout of the two third exhaust pipes 34, improve the compactness of the whole system, and avoid the space occupation area of ​​the whole system caused by the unreasonable installation layout of the third exhaust pipes 34;

[0057] Among them, the two third exhaust pipes 34 are both connected in series with a third control valve 341, and the third control valve 341 controls the connection and disconnection of the third exhaust pipe 34. For example, when the first exhaust pipe 31 and the second exhaust pipe 32 are exhausting and the third exhaust pipe 341 is not needed for auxiliary exhaust, the third control valve 341 controls the first exhaust pipe 31 and the second exhaust pipe 32 to be disconnected to prevent external gas from entering the circulation pipeline 11.

[0058] like Figure 3 As shown, the method for filling antifreeze in the battery liquid cooling system of the present invention is as follows: close the first control valve 17, connect the first exhaust pipe 31 and the second exhaust pipe 32, disconnect the third exhaust pipe 34, under the action of the power exhaust pump 331, the first exhaust pipe 31 and the second exhaust pipe 32 exhaust air outwardly, start the water pump 13, and under the action of the water pump 13, the antifreeze filling tank 2 adds antifreeze into the circulation pipeline 11. After filling for a period of time, disconnect the first exhaust pipe 31 and the second exhaust pipe 32. After the liquid level in the antifreeze filling tank 2 stops decreasing, open the first control valve 17, and the water pump 13 continues to operate until the circulation pipeline 11 is filled with antifreeze.

[0059] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modify the technical contents suggested above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the solution of the present invention.

Claims

1. A battery liquid cooling system, comprising a cooling unit, an antifreeze filling tank and at least one exhaust pipe, wherein the cooling unit comprises a circulation pipeline and a water pump, wherein the liquid chamber of the antifreeze filling tank and the water pump are sequentially connected in series to the circulation pipeline along the circulation direction of the fluid, and the air inlet of each exhaust pipe is connected to the circulation pipeline, characterized in that: The liquid outlet of the liquid chamber of the antifreeze filling tank is connected in series to the circulation pipeline, and its single liquid inlet is independently arranged from the circulation pipeline; The cooling unit also includes a battery; The battery is connected in series to the circulation pipeline between the downstream of the water pump and the upstream of the liquid outlet of the liquid chamber of the antifreeze filling tank; A first control valve is connected in series on the circulation pipeline between the downstream of the battery and the upstream of the liquid outlet of the liquid chamber of the antifreeze filling tank; Close the first control valve, connect the exhaust pipe, exhaust the air outwards through the exhaust pipe, turn on the water pump, and under the action of the water pump, the antifreeze filling tank adds antifreeze into the circulation pipeline. After filling for a period of time, disconnect the exhaust pipe, and when the liquid level in the antifreeze filling tank no longer drops, open the first control valve to complete the filling of antifreeze.

2. The battery liquid cooling system according to claim 1, characterized in that: The system comprises a first exhaust pipe and a second exhaust pipe; the air inlet of the first exhaust pipe is serially connected to a circulation pipeline located upstream of a first control valve, and the air inlet of the second exhaust pipe is serially connected to a circulation pipeline located downstream of a water pump.

3. The battery liquid cooling system according to claim 2, characterized in that: The cooling unit also includes a heat exchanger connected in series to the circulation pipeline located downstream of the water pump; the air inlet of the second exhaust pipe is connected in series to the circulation pipeline located between the downstream of the heat exchanger and the upstream of the first exhaust pipe.

4. The battery liquid cooling system according to claim 3, characterized in that: The battery is connected in series to the circulation pipeline between the downstream of the heat exchanger and the upstream of the first exhaust pipe; the air inlet of the second exhaust pipe is connected in series to the circulation pipeline between the downstream of the heat exchanger and the upstream of the battery.

5. The battery liquid cooling system according to any one of claims 2 to 4, characterized in that: The first exhaust pipe and / or the second exhaust pipe is / are connected in series with a power exhaust device.

6. The battery liquid cooling system according to any one of claims 2 to 4, characterized in that: A second control valve is also connected in series on the circulation pipeline, and the air inlet of the first exhaust pipeline and the air inlet of the second exhaust pipeline are connected in series on the circulation pipeline via the second control valve.

7. The battery liquid cooling system according to any one of claims 2 to 4, characterized in that: The system also includes two third exhaust pipes, an air inlet of one third exhaust pipe is serially connected to the circulation pipeline between the downstream of the first exhaust pipe and the upstream of the first control valve, and an air inlet of the other third exhaust pipe is serially connected to the circulation pipeline between the downstream of the water pump and the upstream of the heat exchanger, and the air outlets of the two third exhaust pipes are connected to the gas chamber of the antifreeze filling tank.

8. The battery liquid cooling system according to claim 7, characterized in that: The two third exhaust pipes are both connected in series with a third control valve.

9. A method for filling antifreeze liquid in a battery liquid cooling system, characterized in that: A battery liquid cooling system according to any one of claims 1 to 8 is adopted.

10. The method for filling antifreeze liquid in a battery liquid cooling system according to claim 9, characterized in that: After closing the first control valve, the exhaust power devices on the first exhaust pipe and the second exhaust pipe are turned on, the first exhaust pipe and the second exhaust pipe are connected, the third exhaust pipe is disconnected, and the first exhaust pipe and the second exhaust pipe exhaust gas outwards.

11. The method for filling antifreeze liquid in a battery liquid cooling system according to claim 10, characterized in that: After the first control valve is opened, the water pump continues to operate until the circulation pipeline is filled with antifreeze.

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