Liquid injection device and liquid-cooled energy storage system

Abstract

The application relates to the technical field of energy storage systems, and discloses a liquid injection device and a liquid-cooled energy storage system. The liquid injection device is used for injecting cooling liquid into a cooling system and comprises a liquid storage device, a liquid collecting device and a gas suction device. The liquid collecting device comprises a shell, the shell is provided with a containing cavity, the shell is provided with an air inlet and a gas suction port which are communicated with the containing cavity, the air inlet is used for being communicated with an exhaust end of the cooling system, and the gas suction port is higher than the cavity bottom of the containing cavity in the height direction of the shell. In the application, the gas suction port is arranged above the cavity bottom of the containing cavity. During the liquid injection process, when the cooling liquid in the cooling system overflows from the exhaust end of the cooling system, the overflowing cooling liquid enters the containing cavity, and the cooling liquid falls to the cavity bottom of the containing cavity under the action of gravity, so that the gas suction device can suck the cooling liquid, the gas suction device can be continuously opened, the negative pressure in the cooling system can be maintained, and the liquid injection effect of the cooling system is improved.

Description

Technical Field

[0001] This application relates to the field of energy storage system technology, specifically to a liquid injection device and a liquid-cooled energy storage system. Background Technology

[0002] In the field of thermal management for energy storage systems, liquid cooling technology has become a key means to improve heat dissipation efficiency and reduce system energy consumption due to the significant advantages of the high thermal conductivity and high heat capacity of liquid media. Injecting coolant into the cooling system is an essential step during its operation.

[0003] Currently, the commonly used method is vacuum injection, which involves first using a vacuum pump to create a negative pressure environment in the cooling system before injecting coolant. However, to prevent the injected coolant from being sucked into the vacuum pump and damaging the equipment, the vacuum pump must be turned off before injecting the coolant. This method results in the negative pressure within the cooling system weakening as the injection process progresses, potentially causing incomplete injection in certain areas and affecting the overall cooling effect. Utility Model Content

[0004] In view of this, this application provides a liquid injection device and a liquid-cooled energy storage system to solve the problem that the vacuum pump must be turned off before injecting coolant, which can easily cause insufficient liquid injection in some areas of the cooling system, thereby affecting the liquid injection effect of the cooling system.

[0005] In a first aspect, this application provides a liquid injection device for injecting coolant into a cooling system, comprising a liquid storage device, a liquid collection device, and an air extraction device. The liquid storage device has a liquid outlet for connecting to the liquid inlet of the cooling system. The liquid collection device includes a housing with a receiving cavity inside. The housing has an air inlet and an air extraction port communicating with the receiving cavity. The air inlet is connected to the exhaust end of the cooling system. Along the height direction of the housing, the air extraction port is higher than the bottom of the receiving cavity. The air extraction device is connected to the air extraction port for extracting air from the receiving cavity.

[0006] Beneficial effects: By placing the air extraction port above the bottom of the receiving cavity and connecting the air extraction device to the air extraction port, and connecting the liquid storage device to the liquid inlet of the cooling system, during the liquid injection process, when the coolant overflows from the exhaust end of the cooling system, the overflowing coolant enters the receiving cavity and falls to the bottom of the receiving cavity under its own weight. This prevents the air extraction device from sucking in coolant, allowing the air extraction device to remain continuously open, maintaining negative pressure within the cooling system, and thus preventing incomplete liquid injection in localized areas of the cooling system, thereby improving the liquid injection effect of the cooling system.

[0007] In one optional embodiment, the housing is further provided with a liquid inlet and a liquid injection port, the liquid inlet being connected to the liquid outlet, and the liquid injection port being used to connect to the liquid inlet of the cooling system; wherein, along the height direction of the housing, the position height of the air extraction port is higher than the position height of the liquid injection port.

[0008] Beneficial effects: The reservoir and collection chambers are connected, and the collection chamber is connected to the inlet of the cooling system. This prevents the cooling system from drawing in excess air during the injection process, thus improving the injection effect. Furthermore, the air extraction port is positioned higher than the injection port, allowing the air extraction device to remain continuously open during the injection process, maintaining negative pressure within the cooling system and further enhancing the injection effect.

[0009] In an optional embodiment, the system further includes a liquid injection pipeline, which comprises a first liquid injection branch, a second liquid injection branch, and a first venting branch. One end of the first liquid injection branch is connected to the liquid outlet, and the other end is connected to the liquid inlet. One end of the second liquid injection branch is connected to the liquid injection port, and the other end is connected to the liquid inlet of the cooling system. One end of the first venting branch is connected to the air inlet, and the other end is connected to the exhaust end of the cooling system.

[0010] Beneficial effects: By setting up a first injection branch to connect the liquid storage device and the receiving cavity, setting up a second injection branch to connect the receiving cavity and the liquid inlet of the cooling system, and setting up a first exhaust branch to connect the exhaust end of the cooling system and the receiving cavity, the coolant in the liquid storage device is injected into the cooling system after passing through the receiving cavity. This can prevent the cooling system from drawing in excess air during the injection process and ensure that the air extraction device is continuously turned on, thereby improving the injection effect.

[0011] In one optional embodiment, the system further includes a drain pipe, which comprises a first drain branch and a second drain branch. One end of the first drain branch is connected to the air inlet, and the other end is connected to the liquid inlet of the cooling system. One end of the second drain branch is connected to the liquid injection port, and the other end is connected to the liquid outlet.

[0012] Beneficial effects: By setting up drainage pipes, connecting the receiving cavity and the inlet of the cooling system through a first drainage branch, and connecting the receiving cavity and the storage device through a second drainage branch, the cooling system can be drained. Furthermore, when the receiving cavity is at a preset vacuum level, the coolant discharged from the cooling system is injected into the storage device after passing through the receiving cavity, increasing the rate at which coolant enters the receiving cavity, thereby improving the drainage efficiency of the cooling system.

[0013] In one alternative embodiment, the system further includes a first valve, one valve port of which is connected to the liquid outlet and the other valve port of which is connected to the liquid inlet; and / or a second valve, one valve port of which is connected to the liquid injection port and the other valve port of which is connected to the liquid inlet of the cooling system; and / or a third valve, one valve port of which is connected to the liquid inlet and the other valve port of which is connected to the exhaust port of the cooling system.

[0014] Beneficial effects: By controlling the opening and closing of different valves, the evacuation process of the receiving cavity and cooling system can be achieved, so that the receiving cavity and cooling system reach the preset vacuum degree, and then the coolant in the liquid storage device is injected into the cooling system through the receiving cavity, thereby maintaining a negative pressure state during the injection of coolant into the cooling system and improving the injection effect.

[0015] In one optional embodiment, a filter element is provided inside the receiving cavity, and the filter element is disposed between the liquid inlet and the liquid injection port along the height direction of the outer shell.

[0016] Beneficial effects: By installing a filter in the containment cavity, the coolant injected into the cooling system from the liquid storage device is filtered to intercept impurities, thereby improving the quality of the coolant in the cooling system and ensuring the normal operation of the cooling system.

[0017] In one alternative embodiment, the injection port is provided with a first driving device for conveying coolant.

[0018] Beneficial effects: The first driving device provides driving force, which facilitates the injection of coolant from the receiving cavity into the cooling system through the injection port, thereby improving the coolant injection efficiency of the cooling system.

[0019] In one optional embodiment, the housing is provided with a pressure detection element adapted to acquire the real-time pressure within the receiving cavity; and / or, the housing is provided with a liquid level detection element adapted to acquire the real-time liquid level height within the receiving cavity.

[0020] Beneficial effects: The pressure detection device monitors the pressure within the containment cavity in real time. The pressure data fed back by the device is for operator observation, allowing them to determine whether the preset vacuum level has been reached, thereby improving the accuracy of the liquid injection process. The liquid level detection device monitors the liquid level within the containment cavity in real time. The liquid level data fed back by the device is for operator observation. By controlling the coolant level within the containment cavity, it prevents coolant from being sucked into the vacuum device, which could damage the vacuum device.

[0021] In one optional embodiment, the housing is provided with a pressure detection element and a liquid level detection element, and the liquid injection device further includes a controller; wherein the controller is electrically connected to the air extraction device and the pressure detection element; and / or, the controller is electrically connected to the liquid level detection element and the first driving device.

[0022] Beneficial effects: The controller is electrically connected to the suction device and pressure detection element. Real-time pressure data from the pressure detection element is transmitted to the controller, which then determines and controls the suction power of the suction device, achieving automatic control and reducing labor costs. Similarly, the controller is electrically connected to a liquid level detection element and the first drive device. Real-time liquid level data from the liquid level detection element is transmitted to the controller, which then determines and controls the first drive device to start, achieving automatic control and also reducing labor costs.

[0023] Secondly, this application provides a liquid-cooled energy storage system, including a cooling system and the liquid injection device described in any one of the above.

[0024] Beneficial effects: The cooling energy storage system has the above-mentioned liquid injection device. During the liquid injection process, the liquid collection device set in the liquid injection device prevents the air extraction device from sucking in the coolant, so that the air extraction device can be kept on continuously to maintain the negative pressure in the cooling system and prevent the local area of ​​the cooling system from being insufficiently injected with liquid, thereby improving the liquid injection effect of the cooling system and thus improving the cooling effect of the liquid-cooled energy storage system. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of an existing liquid injection device;

[0027] Figure 2 This is a schematic diagram illustrating the connection relationship between a liquid storage device and a cooling system during the liquid injection process according to an embodiment of this application.

[0028] Figure 3 This is a schematic diagram of the liquid collection device according to an embodiment of this application;

[0029] Figure 4 This is a schematic diagram illustrating the connection relationship between another liquid storage device and the cooling system during the liquid injection process according to an embodiment of this application.

[0030] Figure 5This is a schematic diagram showing the connection relationship between the liquid storage device and the cooling system during the liquid discharge process according to an embodiment of this application;

[0031] Figure 6 This is a schematic diagram illustrating the process of using the pressure detection element and controller in conjunction with an embodiment of this application.

[0032] Figure 7 This is a schematic diagram illustrating the process of using the liquid level detection device and controller in conjunction with an embodiment of this application.

[0033] Explanation of reference numerals in the attached figures:

[0034] 100. Cooling system; 1001. Coolant inlet; 1002. Gas outlet; Z. Height direction;

[0035] 1. Liquid storage device; 101. Liquid outlet;

[0036] 2. Liquid collection device; 201. Outer shell; 202. Receiving cavity; 203. Air inlet; 204. Air extraction port; 205. Liquid inlet; 206. Liquid injection port;

[0037] 3. Air extraction device; 301. Air pump; 302. Fourth valve;

[0038] 4. Injection pipeline; 401, First injection branch; 402, Second injection branch; 403, First venting branch; 404, Third injection branch;

[0039] 5. Drainage pipeline; 501, First drainage branch; 502, Second drainage branch;

[0040] 6. First valve; 7. Second valve; 8. Third valve; 9. Filter element; 10. First drive device; 11. Pressure detection element; 12. Liquid level detection element; 13. Controller; 14. Second drive device. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0042] like Figure 1As shown, the commonly used method is vacuum injection, which involves first using a vacuum pump 3 to create a negative pressure environment in the cooling system 100 before injecting coolant. However, to prevent the injected coolant from being sucked into the vacuum pump 3 and causing equipment damage, the vacuum pump 3 must be turned off before injecting the coolant. This method results in the negative pressure in the cooling system 100 weakening in the later stages of the injection process, easily causing incomplete injection in some areas of the cooling system 100, thus affecting the injection effect.

[0043] To solve the above problems, please refer to Figures 2-7 In a first aspect, this application provides a liquid injection device for injecting coolant into a cooling system 100, comprising a liquid storage device 1, a liquid collection device 2, and an air extraction device 3. The liquid storage device 1 is provided with a liquid outlet 101, which is used to connect with the liquid inlet of the cooling system 100. The liquid collection device 2 includes a housing 201, and a receiving cavity 202 is provided inside the housing 201. The housing 201 is provided with an air inlet 203 and an air extraction port 204 communicating with the receiving cavity 202. The air inlet 203 is used to connect with the exhaust end of the cooling system 100. Along the height direction Z of the housing 201, the air extraction port 204 is higher than the bottom of the receiving cavity 202. The air extraction device 3 is connected to the air extraction port 204 and is used to extract air from the receiving cavity 202.

[0044] First, it should be noted that, as Figure 1 As shown, the liquid inlet of the cooling system 100 refers to the coolant inlet 1001 located at the bottom of the cooling system 100, and the exhaust end of the cooling system 100 refers to the gas outlet 1002 located at the top of the cooling system 100.

[0045] In this embodiment, as Figure 2 As shown, the gas outlet 1002 is connected to the air inlet 203 of the liquid collection device 2, and the air inlet 203 is connected to the receiving cavity 202, thus connecting the gas outlet 1002 to the receiving cavity 202. During the process of the liquid storage device 1 injecting coolant into the coolant inlet 1001 of the cooling system 100, the gas in the cooling system 100 is discharged and enters the receiving cavity 202 through the gas outlet 1002. An air extraction port 204 is provided on the outer shell 201, and the air extraction port 204 is connected to the air extraction device 3, which is used to extract the gas from the receiving cavity 202.

[0046] During the continuous injection of coolant into the cooling system 100, when a small amount of coolant overflows from the gas outlet 1002, the overflowing coolant enters the receiving cavity 202 through the air inlet 203. Under the influence of gravity, the coolant falls to the bottom of the receiving cavity 202, achieving separation of coolant and air. Since the position of the air extraction port 204 is higher than the bottom of the receiving cavity 202 along the height direction Z of the outer shell 201, the coolant falling to the bottom of the receiving cavity 202 cannot enter the air extraction device 3 through the air extraction port 204. This allows the air extraction device 3 to remain open, maintaining negative pressure within the cooling system 100. This not only allows air to be expelled from the cooling system 100 but also allows air to be released from the coolant, thereby preventing incomplete filling of local areas of the cooling system 100 and improving the filling effect of the cooling system 100.

[0047] Specifically, such as Figure 3 As shown, the air extraction device 3 includes an air extraction pump 301, which is connected to the air extraction port 204. Furthermore, a fourth valve 302 is provided between the air extraction pump 301 and the air extraction port 204. By controlling the opening or closing of the fourth valve 302, the connection or disconnection between the air extraction pump 301 and the air extraction port 204 can be achieved.

[0048] Optionally, such as Figure 2 As shown, the liquid storage device 1 can be configured as one or more combinations of a liquid storage tank, a liquid storage vessel, or a liquid storage pool, and the liquid storage device 1 is used to store coolant.

[0049] Optionally, such as Figure 3 As shown, the outer casing 201 of the liquid collection device 2 can be configured as a liquid collection tank or a liquid collection vessel. The outer casing 201 has good sealing performance to ensure that the evacuation device can evacuate the receiving cavity 202 and the cooling system 100. Preferably, the outer casing 201 is configured as a conical structure, so that the coolant in the receiving cavity 202 is concentrated at the bottom of the receiving cavity 202, which facilitates the discharge of coolant from the receiving cavity 202.

[0050] Optionally, during the process of injecting coolant into the cooling system 100, when the injected volume reaches 75%-85% of the total coolant capacity of the cooling system 100, the vacuum device 3 can be selectively shut off according to actual needs. In this way, without affecting the continued injection of coolant into the cooling system 100, the vacuum device 3 is further prevented from sucking in coolant, thus improving the safety of using the vacuum device 3.

[0051] In one specific implementation, such as Figure 4 As shown, the outlet 101 of the liquid storage device 1 is connected to the coolant inlet 1001 of the cooling system 100 through the third liquid injection branch 404. The third liquid injection branch 404 is equipped with a first driving device 10. The gas outlet 1002 of the cooling system 100 is connected to the air inlet 203 on the outer casing 201 through the first exhaust branch 403.

[0052] With this configuration, the first drive device 10 pumps the coolant in the storage device 1 directly into the cooling system 100 through the third injection branch 404. At the same time, the gas in the cooling system 100 is discharged into the receiving cavity 202 and then discharged from the receiving cavity 202 by the air extraction device 3, so as to maintain the negative pressure in the receiving cavity 202 and the cooling system 100.

[0053] In an optional embodiment, before injecting coolant into the cooling system 100, the outlet 101 of the liquid storage device 1 and the coolant inlet 1001 of the cooling system 100 are disconnected, and the vacuum device 3 is turned on to pre-evacuate the cavity 202 and the cooling system 100 to achieve a preset vacuum level. Then, the disconnection between the outlet 101 and the coolant inlet 1001 is released, and the coolant in the liquid storage device 1 is injected into the cooling system 100. This maintains a negative pressure state in the cavity 202 and the cooling system 100, thereby improving the coolant injection effect.

[0054] In one embodiment, the housing 201 is further provided with a liquid inlet 205 and a liquid injection port 206. The liquid inlet 205 is connected to the liquid outlet 101, and the liquid injection port 206 is used to connect to the liquid inlet end of the cooling system 100. In this embodiment, along the height direction Z of the housing 201, the position height of the air extraction port 204 is higher than the position height of the liquid injection port 206.

[0055] In this embodiment, in addition to the above-mentioned method of directly injecting coolant into the cooling system 100 using the liquid storage device 1, the coolant in the liquid storage device 1 can also be first injected into the receiving cavity 202, and then injected into the cooling system through the liquid injection port 206.

[0056] Specifically, such as Figure 2 , Figure 3 As shown, before injecting coolant into the cooling system 100, the outlet 101 of the liquid storage device 1 and the inlet 205 of the receiving cavity 202 are disconnected, and the vacuum device 3 is turned on. The vacuum device 3 is used to pre-evacuate the receiving cavity 202 and the cooling system 100 to achieve a preset vacuum level. Then, the disconnection between the outlet 101 and the inlet 205 is released, and the coolant in the liquid storage device 1 is injected into the receiving cavity 202. When the coolant in the receiving cavity 202 reaches a preset liquid level (which is lower than the height of the vacuum port 204), the coolant in the receiving cavity 202 is injected into the cooling system 100.

[0057] This configuration, compared to the method of directly injecting coolant into the cooling system 100 through the storage device 1, first collecting the coolant in the receiving cavity 202 and then injecting the coolant in the receiving cavity 202 into the cooling system 100, can reduce the amount of air drawn into the cooling system 100, thereby improving the injection efficiency and effect of the cooling system 100.

[0058] In one embodiment, the system further includes a liquid injection line 4, which includes a first liquid injection branch 401, a second liquid injection branch 402, and a first venting branch 403. One end of the first liquid injection branch 401 is connected to the liquid outlet 101, and the other end is connected to the liquid inlet 205. One end of the second liquid injection branch 402 is connected to the liquid injection port 206, and the other end is used to connect to the liquid inlet of the cooling system 100. One end of the first venting branch 403 is connected to the air inlet 203, and the other end is used to connect to the venting end of the cooling system 100.

[0059] In this embodiment, as Figure 2 As shown, before injecting coolant into the cooling system 100, the first injection branch 401 is cut off. After the vacuum device 3 is turned on, the vacuum device 3 evacuates the receiving cavity 202, the cooling system 100, the second injection branch 402, and the first exhaust branch 403. After the vacuum reaches a preset vacuum level, the first injection branch 401 is turned on, allowing the coolant in the storage device 1 to be sent into the receiving cavity 202 through the first injection branch 401. Gas-liquid separation is achieved in the receiving cavity 202, and the coolant concentrates at the bottom of the receiving cavity 202. When the coolant in the receiving cavity 202 reaches a preset liquid level, the coolant in the receiving cavity 202 is then injected into the cooling system 100 through the second injection branch 402, thereby preventing air from entering the cooling system 100 from the first injection branch 401 and improving the injection effect of the cooling system 100.

[0060] Furthermore, such as Figure 2 As shown, a second drive device 14 is provided on the first liquid injection branch 401. The second drive device 14 can be a suction pump or a peristaltic pump or other drive structure. During the process of injecting liquid into the cooling system 100, the second drive device 14 works to facilitate the pumping of the cooling oil in the liquid storage device 1 to the receiving cavity 202.

[0061] In one embodiment, the system further includes a drain pipe 5, which includes a first drain branch 501 and a second drain branch 502. One end of the first drain branch 501 is connected to the air inlet 203, and the other end is connected to the liquid inlet of the cooling system 100. One end of the second drain branch 502 is connected to the liquid injection port 206, and the other end is connected to the liquid outlet 101.

[0062] In this embodiment, as Figure 5As shown, the liquid injection device can not only inject liquid into the cooling system 100, but also drain liquid from the cooling system 100. When it is necessary to drain liquid from the cooling system 100, the first drain branch 501 connects the air inlet 203 to the coolant inlet 1001 on the cooling system 100, and the second drain branch 502 connects the injection port 206 to the outlet port 101, so that the coolant in the cooling system 100 is first sent into the receiving cavity 202, and then the coolant in the receiving cavity 202 is sent into the liquid storage device 1.

[0063] Optionally, before draining the cooling system 100, the gas outlet 1002 of the cooling system 100 is opened, and the first drain branch 501 and the second drain branch 502 are cut off. The vacuum pump 3 is started to evacuate the receiving cavity 202. When the receiving cavity 202 reaches the preset vacuum level, the first drain branch 501 is opened, so that the coolant in the cooling system 100 enters the receiving cavity 202 in sequence through the coolant inlet 1001, the first drain branch 501 and the air inlet 203. After the coolant in the receiving cavity 202 reaches the preset liquid level, the coolant in the receiving cavity 202 is sent into the liquid storage device 1 through the second drain branch.

[0064] Preferably, such as Figure 2 , Figure 5 As shown, the first drain branch 501 and the first exhaust branch 403 can use the same pipeline, one end of which is always connected to the air inlet 203. Figure 2 As shown, during the process of injecting coolant into the cooling system 100, this pipe is used as the first exhaust branch 403, and its other end is connected to the gas exhaust port 1002. Figure 5 As shown, during the process of draining the coolant from the cooling system 100, this pipe is used as the first drain branch 501, and its other end is connected to the coolant inlet 1001.

[0065] Preferably, such as Figure 2 , Figure 5 As shown, the second drainage branch 502 and the second injection branch 402 can use the same pipeline, one end of which is always connected to the injection port 206. Figure 2 As shown, during the process of injecting coolant into the cooling system 100, this pipeline is used as a second injection branch 402, with its other end connected to the coolant inlet 1001. Figure 5 As shown, during the process of draining the coolant from the cooling system 100, this pipe is used as a second drain branch 502, and its other end is connected to the outlet 101 of the liquid storage device 1.

[0066] In one embodiment, the system further includes a first valve 6, one valve port of which is connected to the outlet 101 and the other valve port of which is connected to the inlet 205; and / or a second valve 7, one valve port of which is connected to the injection port 206 and the other valve port of which is connected to the inlet end of the cooling system 100; and / or a third valve 8, one valve port of which is connected to the inlet 205 and the other valve port of which is connected to the exhaust end of the cooling system 100.

[0067] In this embodiment, as Figure 3 As shown, the opening and closing of the liquid outlet 101 is controlled by setting the first valve 6, the opening and closing of the liquid injection port 206 is controlled by setting the second valve 7, and the opening and closing of the liquid inlet 205 is controlled by setting the third valve 8. The following is an example of the existence of the first valve 6, the second valve 7, and the third valve 8.

[0068] In one specific implementation, such as Figure 2 , Figure 3 As shown, during the operation of injecting coolant into the cooling system 100, the first valve 6 is first closed, and the second valve 7, the third valve 8, and the fourth valve 302 are opened. The first injection branch 401 is cut off by closing the first valve 6. Then, the vacuum device 3 is turned on to pre-evacuate the receiving cavity 202 and the cooling system 100 to achieve a preset vacuum level. Then, the first valve 6 is opened and the second drive device 14 is started to pump the coolant in the storage device 1 to the receiving cavity 202. After the coolant in the receiving cavity 202 reaches the preset liquid level, the first drive device 10 is started to inject the coolant in the receiving cavity 202 into the cooling system 100.

[0069] In another specific implementation, such as Figure 3 , Figure 5 As shown, during the operation of draining the coolant from the cooling system 100, the first valve 6, the second valve 7, and the third valve 8 are closed, the fourth valve 302 is opened, and the vacuum pump 3 is started to evacuate the cavity 202. After the cavity 202 reaches the preset vacuum level, the third valve 8 is opened, and the coolant in the cooling system 100 is pumped into the cavity 202 through the first drain branch 501. After the coolant in the cavity 202 reaches the preset liquid level, the second valve 7 is opened, and the first drive device 10 is used to pump the coolant in the cavity 202 back to the storage device 1 through the second drain branch 502.

[0070] In one embodiment, a filter element 9 is provided in the receiving cavity 202, and along the height direction Z of the outer shell 201, the filter element 9 is disposed between the liquid inlet 205 and the liquid injection port 206.

[0071] In this embodiment, as Figure 3 As shown, a filter element 9 is provided in the receiving cavity 202. The coolant injected into the cooling system 100 by the liquid storage device 1 is intercepted by the filter element 9, which improves the quality of the coolant in the cooling system 100, thereby ensuring the normal operation of the cooling system 100.

[0072] Optionally, the filter element 9 can be configured as a filter screen, filter layer or other filter structure to filter the coolant and prevent impurities contained in the coolant from entering the cooling system 100, thereby improving the working effect of the cooling system 100.

[0073] In one embodiment, a first drive device 10 for conveying coolant is provided on the injection port 206.

[0074] In this embodiment, as Figure 4 As shown, during the operation of injecting coolant into the cooling system 100, when the reservoir 1 is directly connected to the cooling system 100 through the third injection branch 404, the first drive device 10 is installed on the third injection branch 404, thereby providing driving force to pump the coolant in the reservoir 1 into the cooling system 100. Figure 2 As shown, when the liquid storage device 1 is connected to the cooling system 100 through the liquid collection device 2, the first drive device 10 is installed on the second liquid injection branch 402, thereby providing driving force to pump the coolant in the receiving cavity 202 into the cooling system 100.

[0075] In this embodiment, as Figure 5 As shown, during the operation of draining coolant from the cooling system 100, the first drive device 10 is installed on the second drain branch 502, thereby providing driving force to pump the coolant in the receiving cavity 202 into the storage device 1.

[0076] Optionally, the first drive device 10 may employ a drive structure such as a suction pump or a peristaltic pump.

[0077] In one embodiment, a pressure detection element 11 is provided on the outer casing 201, which is adapted to obtain the real-time pressure in the receiving cavity 202; and / or, a liquid level detection element 12 is provided on the outer casing 201, which is adapted to obtain the real-time liquid level height in the receiving cavity 202.

[0078] In this embodiment, as Figure 3As shown, the pressure detection element 11 is used to detect the pressure inside the receiving cavity 202 in real time. The pressure data fed back by the pressure detection element 11 is for the operator to observe. The operator can judge whether the receiving cavity 202 has reached the preset vacuum level based on the feedback pressure data, thereby improving the accuracy of the liquid injection process. The liquid level detection element 12 is used to detect the liquid level height inside the receiving cavity 202 in real time. The liquid level height fed back by the liquid level detection element 12 is for the operator to observe. By controlling the liquid level height of the coolant inside the receiving cavity 202, the coolant inside the receiving cavity 202 is prevented from being sucked into the vacuum device 3, which would damage the vacuum device 3.

[0079] Optionally, the pressure detection element 11 may be a detection device such as a pressure sensor or a vacuum gauge.

[0080] Optionally, the liquid level detection element 12 can be a detection device such as a liquid level sensor or a liquid level gauge.

[0081] In one embodiment, the housing 201 is provided with a pressure detection element 11 and a liquid level detection element 12, and the liquid injection device further includes a controller 13; wherein the controller 13 is electrically connected to the air extraction device 3 and the pressure detection element 11; and / or, the controller 13 is electrically connected to the liquid level detection element 12 and the first drive device 10.

[0082] In this embodiment, the controller 13 is electrically connected to the vacuum device 3 and the pressure detection element 11. The real-time pressure data fed back by the pressure detection element 11 is transmitted to the controller 13. The controller 13 determines whether to open or close the vacuum device 3, thereby achieving automatic control of the vacuum device 3 and reducing labor costs. The controller 13 is also electrically connected to the liquid level detection element 12 and the first drive device 10. The real-time liquid level data fed back by the liquid level detection element 12 is transmitted to the controller 13. The controller 13 determines whether to open or close the first drive device 10, thereby achieving automatic control of the first drive device 10 and also reducing labor costs.

[0083] Specifically, such as Figure 6As shown, when the controller 13 is electrically connected to the air extraction device 3 and the pressure detection element 11, the pressure detection element 11 is set as a pressure sensor. The pressure sensor transmits the detected real-time pressure data to the controller 13. The controller 13 can be a PLC controller. The controller 13 determines whether to shut down the air extraction pump 301 based on the received pressure data. For example, during the operation of injecting liquid into the cooling system 100, the air extraction pump 301 is first started. The air extraction pump 301 operates at high power, quickly extracting air from the receiving cavity 202 and the cooling system 100, causing the pressure in the receiving cavity 202 to increase rapidly. The pressure sensor detects the real-time pressure of the receiving cavity 202 and feeds the data back to the controller 13. When the controller 13 determines that the pressure meets the preset pressure, it sends a signal to the air extraction pump 301 to reduce the output power and continue to work, so as to continue to extract air during subsequent liquid injection. This setting method can realize the automatic adjustment of the air extraction pump 301, reducing labor costs.

[0084] Specifically, such as Figure 7 As shown, when the controller 13 is electrically connected to the liquid level detection element 12 and the first drive device 10, the liquid level detection element 12 is configured as a liquid level sensor. The liquid level sensor transmits the real-time liquid level data detected in the receiving cavity 202 to the controller 13. The controller 13 can be a PLC controller. The controller 13 determines whether to start the first drive device 10 based on the received liquid level data. For example, during the operation of injecting liquid into the cooling system 100, the vacuum pump 301 is first started to extract air from the receiving cavity 202 and the cooling system 100. After the receiving cavity 202 reaches a preset vacuum level, coolant is injected into the receiving cavity 202. The liquid level sensor detects the real-time liquid level in the receiving cavity 202 and feeds the data back to the controller 13. When the controller 13 determines that the liquid level meets the preset liquid level, it sends a signal to the first drive device 10 to start the first drive device 10, which pumps the coolant in the receiving cavity 202 into the cooling system 100. This setting also enables the air pump 301 to automatically shut off, reducing labor costs.

[0085] Of course, in addition to the above-mentioned configuration of the controller 13 being electrically connected to the pressure detection element 11 and the liquid level detection element 12, the controller 13 can also be electrically connected to each valve to further reduce labor costs.

[0086] It should be noted that the above-described method of using controller 13 is merely an example. Those skilled in the art can make adaptive adjustments to the specific method of using controller 13 according to actual needs to meet different usage requirements.

[0087] Secondly, this application provides a liquid-cooled energy storage system, including a cooling system 100 and a liquid injection device as described above.

[0088] In this embodiment, the cooling energy storage system has the above-mentioned liquid injection device. During the liquid injection process into the cooling system 100, the liquid collection device 2 provided by the liquid injection device prevents the air extraction device 3 from sucking in the coolant, so that the air extraction device 3 can be continuously opened to maintain the negative pressure in the cooling system 100, and avoid incomplete liquid injection in some areas of the cooling system 100, thereby improving the liquid injection effect of the cooling system 100 and thus improving the cooling effect of the liquid-cooled energy storage system.

[0089] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and all such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A liquid injection device, characterized in that, For injecting coolant into the cooling system (100), including: The liquid storage device (1) is provided with a liquid outlet (101), which is used to connect to the liquid inlet of the cooling system (100); The liquid collection device (2) includes a housing (201), a receiving cavity (202) is provided inside the housing (201), and an air inlet (203) and an air outlet (204) communicating with the receiving cavity (202) are provided on the housing (201). The air inlet (203) is used to connect with the exhaust end of the cooling system (100). Along the height direction (Z) of the housing (201), the air outlet (204) is higher than the bottom of the receiving cavity (202). An air extraction device (3) is connected to the air extraction port (204) and is used to extract air from the receiving cavity (202).

2. The liquid injection device according to claim 1, characterized in that, The outer casing (201) is also provided with a liquid inlet (205) and a liquid injection port (206). The liquid inlet (205) is connected to the liquid outlet (101), and the liquid injection port (206) is used to connect to the liquid inlet of the cooling system (100). In particular, along the height direction (Z) of the outer shell (201), the position height of the air extraction port (204) is higher than the position height of the liquid injection port (206).

3. The liquid injection device according to claim 2, characterized in that, It also includes an injection line (4), which includes: The first injection branch (401) has one end connected to the outlet (101) and the other end connected to the inlet (205); The second liquid injection branch (402) has one end connected to the liquid injection port (206) and the other end connected to the liquid inlet of the cooling system (100); The first exhaust branch (403) has one end connected to the air inlet (203) and the other end connected to the exhaust end of the cooling system (100).

4. The liquid injection device according to claim 2, characterized in that, It also includes a drain pipe (5), which includes: The first drain branch (501) has one end connected to the air inlet (203) and the other end connected to the liquid inlet of the cooling system (100); The second drainage branch (502) has one end connected to the injection port (206) and the other end connected to the outlet port (101).

5. The liquid injection device according to claim 2, characterized in that, Also includes: The first valve (6) has one valve port connected to the liquid outlet (101) and the other valve port connected to the liquid inlet (205); And / or, a second valve (7), one valve port of which is connected to the injection port (206), and the other valve port of which is connected to the inlet of the cooling system (100); And / or, a third valve (8), one port of which is connected to the liquid inlet (205) and the other port of which is connected to the exhaust end of the cooling system (100).

6. The liquid injection device according to claim 2, characterized in that, A filter element (9) is provided inside the receiving cavity (202). Along the height direction (Z) of the outer shell (201), the filter element (9) is located between the liquid inlet (205) and the liquid injection port (206).

7. The liquid injection device according to claim 2, characterized in that, The injection port (206) is provided with a first drive device (10) for conveying coolant.

8. The liquid injection device according to claim 7, characterized in that, A pressure detection element (11) is provided on the outer shell (201), and the pressure detection element (11) is adapted to obtain the real-time pressure in the receiving cavity (202); And / or, a liquid level detection element (12) is provided on the housing (201), the liquid level detection element (12) being adapted to obtain the real-time liquid level height in the receiving cavity (202).

9. The liquid injection device according to claim 8, characterized in that, The outer casing (201) is provided with a pressure detection element (11) and a liquid level detection element (12), and the liquid injection device also includes a controller (13); The controller (13) is electrically connected to the air extraction device (3) and the pressure detection element (11); And / or, the controller (13) is electrically connected to the liquid level detection element (12) and the first drive device (10).

10. A liquid-cooled energy storage system, characterized in that, include: Cooling system (100); The liquid injection device according to any one of claims 1-9.

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