Self-cleaning liquid injection system and control method

Abstract

The application relates to a self-cleaning liquid injection system, which comprises a liquid storage device for supplying liquid outwardly, a bubble removing device connected with the liquid storage device for supplying liquid to the liquid storage device, and a cleaning device comprising a cleaning liquid inlet, a cleaning liquid supply outlet and a cleaning liquid return outlet connected with the liquid storage device and / or the bubble removing device, wherein the liquid storage device and / or the bubble removing device are provided with a liquid supply group connected with the cleaning liquid supply outlet, the liquid supply group comprises a liquid spray pipe located at the top of the liquid storage device and / or the bubble removing device, and the liquid spray pipe comprises at least one nozzle part, and the outlet of the nozzle part is opposite to the tank wall of the liquid storage device and / or the bubble removing device. According to the self-cleaning liquid injection system, the bubble removing device can be washed from the top by using cleaning liquid, and the cleaning strength is large.

Description

Technical Field

[0001] This application relates to the field of battery electrolyte filling technology, and in particular to a self-cleaning electrolyte filling system and control method. Background Technology

[0002] With the rapid development of electric vehicles and smartphones, the demand for lithium-ion batteries has been continuously increasing, which in turn has promoted the progress and development of lithium-ion battery technology. Lithium-ion batteries are a type of battery with ideal energy density and environmental performance, possessing advantages such as high energy density, high reliability, good processability, and no environmental pollution. Therefore, they are widely used in various portable electronic devices.

[0003] To date, with the significant increase in lithium-ion battery production capacity, there is a need to achieve more automated production and reduce manual operations. In order to meet customers' requirements for longer battery life and higher energy density, there are also higher requirements for the concentration, cleanliness, and injection volume accuracy of the electrolyte during the battery filling process. The original filling and cleaning system has poor cleaning effect and incomplete cleaning, and uses a lot of DMC (DMC, also known as dimethyl carbonate, is a colorless and transparent liquid with good cleaning effect and evaporation performance). Summary of the Invention

[0004] This application provides a self-cleaning liquid injection system. When replacing the electrolyte, the nozzle is positioned on top of the defoaming device, and the cleaning liquid is used to flush the defoaming device from the top. The cleaning force is strong and can effectively remove the electrolyte and crystals in the defoaming device. The cleaning liquid can be recycled and has high cleaning efficiency.

[0005] In a first aspect, this application provides a self-cleaning liquid injection system, comprising:

[0006] Liquid storage device for supplying liquid to external users;

[0007] A defoaming device, connected to the liquid storage device, is used to supply liquid to the liquid storage device;

[0008] The cleaning device includes a cleaning fluid inlet, a cleaning fluid supply port and a cleaning fluid return port connecting the storage device and / or the defoaming device.

[0009] The liquid storage device and / or the defoaming device are provided with a liquid supply group, which is connected to the cleaning liquid supply port. The liquid supply group includes a spray pipe located at the top of the liquid storage device and / or the defoaming device. The spray pipe includes at least one nozzle, and the outlet of the nozzle is opposite to the tank wall of the liquid storage device and / or the defoaming device.

[0010] According to the self-cleaning liquid injection system of this application, the liquid injection pipe further includes a liquid supply section, which is annular, and there are multiple nozzle sections disposed on the liquid supply section.

[0011] According to the self-cleaning injection system of this application, the axial angle α between the nozzle portion and the liquid storage device and / or the defoaming device satisfies: 30°≤α≤60°; and / or the angle β formed by the projection of the nozzle portion onto the radial cross-section of the liquid storage device and / or the defoaming device satisfies: 30°≤β≤60°.

[0012] According to the self-cleaning liquid injection system of this application, the spray pipe is rotatably connected to the liquid storage device and / or the defoaming device, and the liquid storage device and / or the defoaming device is further provided with a power unit, which is drivenly connected to the spray pipe to drive the spray pipe to rotate.

[0013] Optionally, the rotation axis of the spray pipe coincides with the rotation center axis of the liquid storage device and / or the defoaming device.

[0014] According to the self-cleaning liquid injection system of this application, both the liquid storage device and the defoaming device include a tank, and the diameter of the side wall of the tank decreases gradually away from the bottom wall of the tank.

[0015] Optionally, the defoaming device includes a stirring assembly, which includes a stirring rod with multiple blades extending in a spiral arrangement side by side.

[0016] The self-cleaning liquid injection system according to this application further includes a vacuum pipeline system that is connected to the liquid storage device, the defoaming device and the cleaning device respectively via pipelines; and a positive pressure pipeline system that is connected to the liquid storage device, the defoaming device and the cleaning device respectively via pipelines.

[0017] Optionally, the positive pressure pipeline system includes a first positive pressure pipeline connected to the liquid storage device, a second positive pressure pipeline connected to the defoaming device, and a third positive pressure pipeline connected to the cleaning device. Each of the first, second, and third positive pressure pipelines is equipped with a pressure regulating valve and at least one first filter. And / or the defoaming device further includes a liquid inlet pipeline, one end of which is connected to the defoaming device, and the other end is used to connect to a liquid supply device. At least one second filter is provided on the liquid inlet pipeline.

[0018] Optionally, the self-cleaning liquid injection system includes a cabinet, in which the liquid storage device, the defoaming device, and the cleaning device are all located. The cleaning device is located below the defoaming device, and the height of the defoaming device is greater than the height of the liquid storage device.

[0019] According to the self-cleaning liquid injection system of this application, the bottom of the liquid storage device is provided with a first discharge pipe, the bottom of the defoaming device is provided with a second discharge pipe, and both the first discharge pipe and the second discharge pipe are provided with a switch valve.

[0020] According to the control method of this application, the method for controlling the above-mentioned self-cleaning injection system includes:

[0021] The vacuum pipeline system is connected to the defoaming device, the third positive pressure pipeline is connected, and the defoaming device is connected to the cleaning fluid supply port.

[0022] After the first moment of connection, the vacuum pipeline system is controlled to be cut off from the defoaming device, the third positive pressure pipeline is cut off, and the defoaming device and the cleaning fluid supply port are cut off. The second positive pressure pipeline is controlled to be connected, the vacuum pipeline system is connected to the cleaning device, and the defoaming device and the cleaning fluid return port are connected.

[0023] According to the control method of this application, the method for controlling the above-mentioned self-cleaning injection system includes:

[0024] The vacuum pipeline system is connected to the liquid storage device, the third positive pressure pipeline is connected, and the liquid storage device is connected to the cleaning fluid supply port.

[0025] After the second conduction time, the vacuum pipeline system is controlled to be cut off from the liquid storage device, the third positive pressure pipeline is cut off, and the liquid storage device and the cleaning fluid supply port are cut off. The first positive pressure pipeline is controlled to be connected, the vacuum pipeline system is connected to the cleaning device, and the liquid storage device and the cleaning fluid return port are connected.

[0026] The technical solutions provided in this application have the following advantages compared with the prior art:

[0027] The self-cleaning liquid injection system provided in this application embodiment includes a liquid storage device for storing electrolyte, a defoaming device for defoaming the electrolyte, and a cleaning device for storing cleaning fluid. When the electrolyte needs to be replaced in the automatic cleaning liquid injection system, the defoaming device needs to be cleaned first. The nozzle is set on the top of the defoaming device, and the cleaning fluid is used to flush the defoaming device from the top. The cleaning force is strong and can effectively remove electrolyte and crystals in the defoaming device. The cleaning fluid can be recycled and has high cleaning efficiency. Attached Figure Description

[0028] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0031] Figure 1 A flow path diagram of a self-cleaning liquid injection system provided in an embodiment of this application;

[0032] Figure 2 A perspective view of a self-cleaning liquid injection system provided in an embodiment of this application;

[0033] Figure 3 A partial three-dimensional view of a self-cleaning liquid injection system provided in an embodiment of this application;

[0034] Figure 4 A perspective view of the liquid supply assembly of a self-cleaning liquid injection system provided in an embodiment of this application;

[0035] Figure 5 A side view of the liquid supply assembly of a self-cleaning liquid injection system provided in an embodiment of this application;

[0036] Figure 6 A schematic diagram illustrating the cleaning process of a defoaming device for a self-cleaning injection system provided in this application embodiment;

[0037] Figure 7 A schematic diagram illustrating the discharge of cleaning fluid from a defoaming device in a self-cleaning liquid injection system provided in this application embodiment;

[0038] Figure 8 A schematic diagram illustrating the cleaning of the liquid storage device of a self-cleaning liquid injection system provided in this application embodiment;

[0039] Figure 9 A schematic diagram illustrating the discharge of cleaning fluid from the storage device of a self-cleaning liquid injection system provided in this application embodiment;

[0040] Figure 10 A schematic diagram of the defoaming device of a self-cleaning liquid injection system provided in this application being filled with electrolyte;

[0041] Figure 11 A schematic diagram of a vacuum stirring device for a self-cleaning liquid injection system provided in an embodiment of this application;

[0042] Figure 12 A schematic diagram of a defoaming device supplying liquid to a liquid storage device in a self-cleaning liquid injection system provided in an embodiment of this application;

[0043] Figure 13 A schematic diagram of a self-cleaning liquid filling system for battery liquid filling provided in this application embodiment;

[0044] Figure 14 A schematic diagram illustrating the replenishment of cleaning fluid to a cleaning device using a self-cleaning fluid injection system provided in this application embodiment;

[0045] Figure 15 This is a schematic diagram of the liquid storage device and defoaming device of a self-cleaning liquid injection system provided in an embodiment of this application, showing the manual discharge of residual liquid.

[0046] Explanation of reference numerals in the attached figures:

[0047] Liquid storage device 10, first pipeline 12, injection pump 121, first liquid level sensor 122, first discharge pipeline 13, switch valve 14, defoaming device 20, second liquid level sensor 211, second pipeline 22, stirring assembly 23, stirring rod 231, blade 232, inlet pipeline 24, one-way valve 241, second filter 25, second discharge pipeline 26, cleaning device 30, third liquid level sensor 311, third pipeline 32, fourth pipeline 33 Fifth pipeline 34, sixth pipeline 35, first liquid supply group 40, spray pipe 41, nozzle part 411, liquid supply part 412, vacuum pipeline system 50, first vacuum pipeline 51, second vacuum pipeline 52, third vacuum pipeline 53, gas-liquid separation device 54, positive pressure pipeline system 60, first positive pressure pipeline 61, second positive pressure pipeline 62, third positive pressure pipeline 63, pressure regulating valve 64, first filter 65, cabinet 70, manual valve 80, electric valve 81. Detailed Implementation

[0048] 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.

[0049] The following disclosure provides numerous different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0050] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0051] In the existing technology, electrolytes come in various specifications and models. When changing the electrolyte, the defoaming device 20 needs to be cleaned. Since the defoaming device 20 is large in volume and tall, the cleaning solution often flows slowly into the defoaming device 20 from the bottom for cleaning. This requires a large amount of cleaning solution to soak and clean the impurities on the tank wall of the defoaming device 20. The cleaning power is small, the demand for cleaning solution is large, and the whole process of liquid injection and cleaning is time-consuming and inefficient.

[0052] like Figure 1 and Figure 2 As shown, the self-cleaning liquid injection system according to an embodiment of this application includes: a liquid storage device 10, a defoaming device 20, and a cleaning device 30.

[0053] Specifically, the liquid storage device 10 is used to supply liquid to the outside, the defoaming device 20 is connected to the liquid storage device 10 and is used to supply liquid to the liquid storage device 10, the cleaning device 30 includes a cleaning liquid inlet, a cleaning liquid supply port and a cleaning liquid return port connected to the liquid storage device 10 and / or the defoaming device 20, the liquid storage device 10 and / or the defoaming device 20 are provided with a liquid supply group 40, the liquid supply group 40 includes a spray pipe 41, the spray pipe 41 is located at the top of the liquid storage device 10 and / or the defoaming device 20, the spray pipe 41 includes at least one nozzle part 411, the outlet of the nozzle part 411 is opposite to the tank wall of the liquid storage device 10 and / or the defoaming device 20.

[0054] To elaborate, the electrolyte storage device 10 is used to add electrolyte to the battery, such as... Figure 13 As shown; the defoaming device 20 is used for defoaming. The cleaning liquid stored in the cleaning device 30 enters the storage device 10 through the corresponding cleaning liquid supply port to clean the storage device 10. The corresponding cleaning liquid return port is used to allow the cleaning liquid carrying impurities after cleaning the storage device 10 to flow back to the cleaning device 30. The corresponding cleaning liquid supply port is used to allow the cleaning liquid stored in the cleaning device 30 to enter the defoaming device 20 for cleaning. The corresponding cleaning liquid return port is used to allow the cleaning liquid carrying impurities after cleaning the defoaming device 20 to flow back to the cleaning device 30. The cleaning liquid inlet is used to allow external sources to replenish the cleaning liquid to the cleaning device 30.

[0055] In one specific embodiment, the first pipeline 12 is connected to the liquid storage device 10 and is used to connect to the battery that needs to be filled with liquid; the second pipeline 22 is connected to the defoaming device 20 and the liquid storage device 10; the third pipeline 32 is connected to the cleaning fluid supply port and the liquid storage device 10; the fourth pipeline 33 is connected to the liquid storage device 10 and the cleaning fluid return port; the fifth pipeline 34 is connected to the cleaning fluid supply port and the defoaming device 20; and the sixth pipeline 35 is connected to the defoaming device 20 and the cleaning fluid return port.

[0056] The spray pipe 41 is located at the top of the defoaming device 20. The spray pipe 41 includes at least one nozzle section 411. The outlet of the nozzle section 411 is opposite to the tank wall of the defoaming device 20. In this way, the cleaning liquid sprayed from the top of the defoaming device 20 by the nozzle section 411 can be used to flush the tank wall. The flushing force is used to clean the electrolyte and crystals on the tank wall. It has a direct flushing force on the tank wall. At the same time, the cleaning liquid also has a flushing force as it flows down the tank wall. Compared with soaking cleaning, the flushing cleaning force is greater, the amount of electrolyte required is less, the cleaning efficiency is high, and the cleaning force is strong. At the same time, the electrolyte can be recycled, which greatly saves electrolyte change time and labor.

[0057] The cross-sectional shape of the liquid storage device 10 includes, but is not limited to, square, elliptical, circular and rectangular shapes, etc., and this application does not impose any restrictions.

[0058] The cross-sectional shape of the defoaming device 20 includes, but is not limited to, square, elliptical, circular, and rectangular shapes, etc., and this application does not impose any restrictions.

[0059] The cross-sectional shape of the cleaning device 30 includes, but is not limited to, square, elliptical, circular, and rectangular shapes, etc., and this application does not impose any restrictions.

[0060] In some embodiments, the first pipeline 12 is equipped with an injection pump to enable precise quantitative injection of electrolyte into the battery.

[0061] In some embodiments, the third pipe 32 is connected to the first inlet of the liquid storage device 10, the first inlet being located at the top of the liquid storage device 10; the fourth pipe 33 is connected to the first outlet of the liquid storage device 10, the first outlet being located at the bottom of the liquid storage device 10; the fifth pipe 34 is connected to the second inlet of the defoaming device 20, the second inlet being located at the top of the defoaming device 20; and the sixth pipe 35 is connected to the second outlet of the defoaming device 20, the second outlet being located at the bottom of the defoaming device 20.

[0062] According to the self-cleaning liquid injection system of this application embodiment, the liquid storage device 10 is used to store electrolyte, the defoaming device 20 is used to defoam the electrolyte, and the cleaning device 30 is used to store cleaning liquid. When it is necessary to replace the electrolyte in the automatic cleaning liquid injection system, the defoaming device 20 needs to be cleaned first. The nozzle part 411 is set on the top of the defoaming device 20, and the cleaning liquid is used to rinse the defoaming device 20 from the top. The cleaning force is strong and can effectively remove the electrolyte and crystals in the defoaming device 20. The cleaning liquid can be recycled and the cleaning efficiency is high.

[0063] like Figures 2-5 As shown, in the self-cleaning liquid injection system according to the embodiment of this application, the spray pipe 41 further includes a liquid supply section 412, which is annular and has multiple nozzle sections 411 disposed on the liquid supply section 412.

[0064] Understandably, by setting multiple nozzles 411, the cleaning fluid in the supply unit 412 can be divided into multiple streams to flush the defoaming device 20, thereby increasing the flushing force of the cleaning fluid on the tank walls of the defoaming device 20 and improving the cleaning power and efficiency of the cleaning fluid on the defoaming device 20.

[0065] The multiple nozzles 411 can be evenly distributed on the liquid supply pipe, or they can be set according to the required density. The number of nozzles 411 can be set according to the outlet diameter of the nozzles 411 and the size of the defoaming device 20.

[0066] In addition, the fact that the liquid supply section 412 is ring-shaped means that the beginning and end of the liquid supply section 412 are connected. It is not limited to a circular ring, an elliptical ring, a square ring, or a rectangular ring. Preferably, the shape of the liquid supply section 412 is adapted to the cross-sectional shape of the defoaming device 20, which can further improve the flushing effect of the cleaning liquid.

[0067] like Figure 5 As shown, in some embodiments, the included angle α between the nozzle portion 411 and the axial direction of the liquid storage device 10 and / or the defoaming device 20 satisfies: 30°≤α≤60°.

[0068] Specifically, when the liquid supply unit 40 is installed in the liquid storage device 10, the larger the angle α between the nozzle portion 411 and the axial direction of the liquid storage device 10, the smaller the area with the greatest direct scouring force on the tank wall of the liquid storage device 10 will be. Conversely, the smaller α is, the more dead zones will appear when scouring the liquid storage device 10. Therefore, setting an appropriate α value can ensure that the area with the greatest direct scouring force of the cleaning liquid on the tank wall of the liquid storage device 10 remains moderate, while minimizing the appearance of dead zones. α can be 30°, 35°, 40°, 45°, 50°, 55°, or 60°, etc.

[0069] When the liquid supply unit 40 is located within the defoaming device 20, the area with the greatest direct scouring force on the tank wall of the defoaming device 20 will be smaller. A smaller α value makes it easier for more dead zones to appear during the scouring of the defoaming device 20. Therefore, setting an appropriate α value can ensure that the area with the greatest direct scouring force of the cleaning liquid on the tank wall of the defoaming device 20 remains moderate, while minimizing the appearance of dead zones. α can be 30°, 35°, 40°, 45°, 50°, 55°, or 60°, etc.

[0070] It is understood that the included angle α between each of the multiple nozzle portions 411 and the axial direction of the defoaming device 20 may be the same, partially the same, partially different, or all different; this application does not impose any restrictions.

[0071] like Figure 5 As shown, in some embodiments, the included angle β formed by the projection of the nozzle portion 411 onto the radial cross section of the liquid storage device 10 and / or the defoaming device 20 satisfies: 30°≤β≤60°.

[0072] Specifically, when the liquid supply unit 40 is installed in the liquid storage device 10, the larger the angle β formed by the projections of the nozzle portion 411 and the nozzle portion 411 in the radial cross-section of the liquid storage device 10, the more dead zones are likely to appear in the rinsing of the liquid storage device 10. The smaller β is, the smaller the range of areas with greater direct rinsing force on the tank wall of the liquid storage device 10. Therefore, setting an appropriate value for β can ensure that the range of areas with greater direct rinsing force of the cleaning liquid on the tank wall of the liquid storage device 10 is kept moderate, while avoiding the appearance of dead zones. β can be 30°, 35°, 40°, 45°, 50°, 55°, or 60°, etc.

[0073] When the liquid supply unit 40 is installed in the defoaming device 20, the larger the angle β formed by the projections of the nozzle portion 411 and the nozzle portion 411 in the radial cross-section of the defoaming device 20, the more dead zones are likely to appear in the rinsing of the defoaming device 20. The smaller β is, the smaller the range of areas with greater direct rinsing force on the tank wall of the defoaming device 20. Therefore, setting an appropriate value for β can ensure that the range of areas with greater direct rinsing force of the cleaning liquid on the tank wall of the defoaming device 20 is kept moderate, while avoiding the appearance of dead zones. β can be 30°, 35°, 40°, 45°, 50°, 55°, or 60°, etc.

[0074] It is understood that, among the multiple nozzle portions 411, the included angle β formed by each nozzle portion 411 and its projection in the radial cross section of the liquid storage device 10 and / or the defoaming device 20 may all be the same, may be partially the same, may be partially different, or may be different from each other; this application does not impose any limitations.

[0075] According to the self-cleaning liquid injection system of this application embodiment, the spray pipe 41 is rotatably connected to the liquid storage device 10 and / or the defoaming device 20. The liquid storage device 10 and / or the defoaming device 20 are also provided with a power unit, which is drivenly connected to the spray pipe 41 to drive the spray pipe 41 to rotate.

[0076] In other words, when the liquid storage device 10 is equipped with a spray pipe 41, the spray pipe 41 is rotatably connected to the liquid storage device 10, and the power unit is located on the liquid storage device 10. The power unit is driven by the spray pipe 41 to rotate the spray pipe 41, thereby increasing the flushing force of the liquid sprayed from the spray pipe 41 on the tank wall, thus reducing the amount of cleaning liquid used. The power unit can be configured as either an electric motor or a motor.

[0077] When the defoaming device 20 is equipped with a spray pipe 41, the spray pipe 41 is rotatably connected to the defoaming device 20. The power unit is located on the defoaming device 20 and is driven by the spray pipe 41 to rotate the spray pipe 41, thereby increasing the flushing force of the liquid sprayed from the spray pipe 41 on the tank wall and reducing the amount of cleaning liquid used. The power unit can be configured as either an electric motor or a motor.

[0078] In some embodiments, the rotation axis of the spray pipe 41 coincides with the rotation center axis of the liquid storage device 10 and / or the defoaming device 20.

[0079] When the liquid storage device 10 is equipped with a spray pipe 41, the rotation axis of the spray pipe 41 coincides with the rotation center axis of the liquid storage device 10, which can improve the uniformity of the scouring force of the spray pipe 41 on the tank wall of the liquid storage device 10, thereby ensuring the cleanliness of each place and avoiding dead corners.

[0080] When the defoaming device 20 is equipped with a spray pipe 41, the rotation axis of the spray pipe 41 coincides with the rotation center axis of the defoaming device 20, which can improve the uniformity of the scouring force of the spray pipe 41 on the tank wall of the defoaming device 20, thereby ensuring the cleanliness of each area and avoiding dead corners.

[0081] According to the self-cleaning liquid injection system of this application embodiment, both the liquid storage device 10 and the defoaming device 20 include a tank, and the diameter of the side wall of the tank gradually decreases away from the bottom wall of the tank. This further reduces the friction between the electrolyte and the tank, thereby reducing adhesion and making the electrolyte easier to clean, thus reducing the amount of cleaning fluid used. Specifically, the difference between the diameter of the end of the side wall of the tank away from the bottom wall and the diameter of the end of the side wall of the tank closer to the bottom wall should not be too large; that is, the angle between the side wall of the tank and the rotation axis of the tank should preferably be maintained between 5° and 10°.

[0082] Since the electrolyte may carry gas and form bubbles during the flow of the defoaming device 20, in some embodiments, the defoaming device 20 is provided with a stirring assembly 23, which includes a stirring rod 231 and multiple blades 232 extending in a spiral arrangement in parallel.

[0083] The defoaming device 20 is equipped with a stirring component 23, which can stir the electrolyte and eliminate bubbles in the electrolyte. The stirring rod 231 is equipped with multiple blades 232 that extend in a spiral shape in parallel. During the stirring process, it can form a larger liquid turbulence, which makes it easier for gas to be stirred out and improves the stirring effect of the stirring component 23 on the electrolyte, greatly reducing the gas in the electrolyte.

[0084] The number of blades 232 can be set as needed, such as two, three, four, or five.

[0085] like Figure 1 As shown, in some embodiments, the self-cleaning injection system further includes a vacuum pipeline system 50 connected to the liquid storage device 10, the defoaming device 20 and the cleaning device 30 respectively via pipelines; and a positive pressure pipeline system 60 connected to the liquid storage device 10, the defoaming device 20 and the cleaning device 30 respectively via pipelines.

[0086] Specifically, the vacuum pipeline system 50 is used to evacuate the liquid storage device 10, the defoaming device 20, and the cleaning device 30, and the positive pressure pipeline system 60 is used to fill the liquid storage device 10, the defoaming device 20, and the cleaning device 30 with gas (a specified gas).

[0087] In one specific embodiment, the vacuum pipeline system 50 includes a first vacuum pipeline 51, a second vacuum pipeline 52, and a third vacuum pipeline 53. The first vacuum pipeline 51 is connected to the liquid storage device 10, the second vacuum pipeline 52 is connected to the defoaming device 20, and the third vacuum pipeline 53 is connected to the cleaning device 30. The positive pressure pipeline system 60 includes a first positive pressure pipeline 61, a second positive pressure pipeline 62, and a third positive pressure pipeline 63. The first positive pressure pipeline 61 is connected to the liquid storage device 10, the second positive pressure pipeline 62 is connected to the defoaming device 20, and the third positive pressure pipeline 63 is connected to the cleaning device 30.

[0088] The system includes a first vacuum line 51 for evacuating the liquid storage device 10, thus removing gas from the device; a second vacuum line 52 for evacuating the defoaming device 20, thus removing gas from the device; and a third vacuum line 53 for evacuating the cleaning device 30, thus removing gas from the cleaning device 30. This system ensures that liquids (electrolyte or cleaning solution) can still be injected into the liquid storage device 10, defoaming device 20, and cleaning device 30 after evacuation.

[0089] The first positive pressure line 61 is used to fill the liquid storage device 10 with gas (a specified gas), the second positive pressure line 62 is used to fill the defoaming device 20 with gas (a specified gas), and the third positive pressure line 63 is used to fill the cleaning device 30 with gas (a specified gas, usually nitrogen). In this way, through the combined use of vacuum lines (first vacuum line 51, second vacuum line 52 and third vacuum line 53) and positive pressure lines (first positive pressure line 61, second positive pressure line 62 and third positive pressure line 63), liquid can flow between any two of the liquid storage device 10, defoaming device 20 and cleaning device 30, without being limited by the height difference between the tanks.

[0090] like Figure 1 As shown, in some embodiments, the first positive pressure line 61, the second positive pressure line 62, and the third positive pressure line 63 are each provided with a pressure regulating valve 64 and at least one first filter 65.

[0091] The pressure regulating valve 64 can regulate the pressure in the positive pressure lines (first positive pressure line 61, second positive pressure line 62, and third positive pressure line 63), and the first filter 65 can filter out fine particles and metallic impurities in the positive pressure lines (first positive pressure line 61, second positive pressure line 62, and third positive pressure line 63). The first filter 65 can be configured as a magnetic filter.

[0092] In some embodiments, the first vacuum line 51, the second vacuum line 52, the third vacuum line 53, the first positive pressure line 61, the second positive pressure line 62, and the third positive pressure line 63 are also equipped with a manual valve 80 and an electric valve 81. In this way, when the electric valve 81 fails, the manual valve 80 can be used to control the opening or closing of the line.

[0093] like Figure 1 As shown, in some embodiments, at least one of the first vacuum line 51, the second vacuum line 52, and the third vacuum line 53 is further provided with a gas-liquid separation device 54. Preferably, all three vacuum lines 51, 52, and 53 are provided with a gas-liquid separation device 54. Manual valves 80 are provided on both sides of the gas-liquid separation device 54, so that the gas-liquid separation device 54 can be independently removed when it needs to be disassembled, replaced, or repaired.

[0094] like Figure 1 As shown, in some embodiments, the liquid storage device 10 is provided with a first liquid level sensor 122 for monitoring the liquid level in the liquid storage device 10.

[0095] like Figure 1 As shown, in some embodiments, the defoaming device 20 is provided with a second liquid level sensor 211 for monitoring the liquid level in the defoaming device 20.

[0096] like Figure 1 As shown, in some embodiments, the cleaning device 30 is provided with a third liquid level sensor 311 for monitoring the liquid level in the cleaning device 30.

[0097] like Figure 1 As shown, in some embodiments, the defoaming device 20 further includes a liquid inlet pipe 24, one end of which is connected to the defoaming device 20, and the other end is used to connect to a liquid supply device. At least one second filter 25 is provided on the liquid inlet pipe 24. Figure 10 The diagram shown is a schematic of adding electrolyte to the defoaming device 20.

[0098] The second filter 25 can effectively filter fine particles and metallic impurities in the electrolyte. The second filter 25 can be configured as a magnetic filter. In one specific embodiment, three second filters 25 are provided on the inlet pipe 24, thereby achieving a higher degree of electrolyte purification and greatly improving the cleanliness of the electrolyte.

[0099] like Figure 1 As shown, in some embodiments, the liquid inlet line 24 is also equipped with a manual valve 80 and an electric valve 81. In this way, when the electric valve 81 fails, the manual valve 80 can be used to control the opening or closing of the line.

[0100] In some embodiments, a one-way valve 241 is provided on the inlet pipe 24 so that the electrolyte can only flow along the liquid supply device toward the defoaming device 20.

[0101] like Figure 2 As shown, in some embodiments, the self-cleaning liquid injection system includes a cabinet 70, with the liquid storage device 10, defoaming device 20, and cleaning device 30 all housed within the cabinet 70. The cleaning device 30 is located below the defoaming device 20, and the height of the defoaming device 20 is greater than the height of the liquid storage device 10. Thus, since the defoaming device 20 has the largest volume, placing the cleaning device 30 below it, while other electrical control structures are located above the liquid storage device 10, allows for a more rational arrangement of the various tanks (liquid storage device 10, defoaming device 20, and cleaning device 30), reducing the overall volume of the self-cleaning liquid injection system. Furthermore, the combination of the vacuum piping system 50 and the positive pressure piping system 60 ensures that the liquid flow is unaffected by the height of the tanks.

[0102] like Figure 1 and Figure 2 As shown, in the self-cleaning liquid injection system according to an embodiment of this application, the bottom of the liquid storage device 10 is provided with a first discharge pipe 13, and the bottom of the defoaming device 20 is provided with a second discharge pipe 26. Both the first discharge pipe 13 and the second discharge pipe 26 are equipped with a switch valve 14. Thus, residual liquid in the liquid storage device 10 can be discharged through the first discharge pipe 13, and the switch valve 14 can control the opening and closing of the first discharge pipe 13. Similarly, residual liquid in the defoaming device 20 can be discharged through the second discharge pipe 26, and the switch valve 14 can control the opening and closing of the second discharge pipe 26. Figure 15 The diagram shows the manual discharge of residual liquid from the liquid storage device 10 and the defoaming device 20, respectively.

[0103] The control method according to an embodiment of this application is used to control the above-mentioned self-cleaning injection system, including:

[0104] Step S10: Connect the vacuum pipeline system 50 to the defoaming device 20, connect the third positive pressure pipeline 63, and connect the defoaming device 20 to the cleaning fluid supply port;

[0105] Step S12: After the first time of conduction, control the vacuum pipeline system 50 to be cut off from the defoaming device 20, the third positive pressure pipeline 63 to be cut off, and the defoaming device 20 and the cleaning fluid supply port to be cut off. Control the second positive pressure pipeline 62 to be conducted, the vacuum pipeline system 50 to be conducted from the cleaning device 30, and the defoaming device 20 and the cleaning fluid return port to be conducted.

[0106] like Figure 6 As shown, in step S10, controlling the vacuum pipeline system 50 to connect with the defoaming device 20, i.e., controlling the second vacuum pipeline 52 to connect, can evacuate the defoaming device 20 and put it in a negative pressure state; controlling the third positive pressure pipeline 63 to connect can increase the pressure in the cleaning device 30; controlling the defoaming device 20 to connect with the cleaning liquid supply port, i.e., controlling the fifth pipeline 34 to connect, can allow the cleaning liquid to enter the defoaming device 20 through the fifth pipeline 34 under the action of the pressure difference at both ends, and flush the tank wall of the defoaming device 20.

[0107] like Figure 7 As shown, in step S12, after a certain period of conduction, the liquid level in the defoaming device 20 or the cleaning device 30 can be monitored, or the monitoring can be carried out by timing or other means. The vacuum pipeline system 50 is controlled to be cut off from the defoaming device 20, that is, the second vacuum pipeline 52 is controlled to be cut off. The third positive pressure pipeline 63 is controlled to be cut off. The defoaming device 20 and the cleaning liquid supply port are controlled to be cut off, that is, the fifth pipeline 34 is cut off. The second positive pressure pipeline 62 is controlled to be conducted, so that the pressure in the defoaming device 20 increases. The vacuum pipeline system 50 is controlled to be conducted from the cleaning device 30, that is, the third vacuum pipeline 53 is conducted, so that the cleaning device 30 is in a negative pressure state. The defoaming device 20 and the cleaning liquid return port are controlled to be conducted, that is, the sixth pipeline 35 is conducted, so that the cleaning liquid enters the cleaning device 30 through the sixth pipeline 35 under the action of the pressure difference between the two ends, so that the cleaning liquid carries the cleaned impurities out of the defoaming device 20.

[0108] The control method according to an embodiment of this application is used to control the above-mentioned self-cleaning injection system, including:

[0109] Step S20: Connect the vacuum pipeline system 50 to the liquid storage device 10, connect the third positive pressure pipeline 63, and connect the liquid storage device 10 to the cleaning fluid supply port;

[0110] Step S22: After the second conduction time, control the vacuum pipeline system 50 to be cut off from the liquid storage device 10, the third positive pressure pipeline 63 to be cut off, and the liquid storage device 10 and the cleaning fluid supply port to be cut off. Control the first positive pressure pipeline 61 to be connected, the vacuum pipeline system 50 to be connected from the cleaning device 30, and the liquid storage device 10 and the cleaning fluid return port to be connected.

[0111] like Figure 8 As shown, in step S20, the vacuum pipeline system 50 is connected to the liquid storage device 10, that is, the first vacuum pipeline 51 is connected, which can put the liquid storage device 10 in a negative pressure state and the third positive pressure pipeline 63 in a positive pressure state. The vacuum pipeline system 50 is connected to the cleaning device 30, that is, the third pipeline 32 is connected. The liquid storage device 10 is connected to the cleaning liquid supply port, that is, the fourth pipeline 33 is connected, so that the cleaning liquid enters from the cleaning device 30 into the liquid storage device 10 under the action of the pressure difference between the liquid storage device 10 and the cleaning device 30, and cleans the liquid storage device 10.

[0112] like Figure 9 As shown, in step S22, after the second conduction time, the liquid level in the storage device 10 or the liquid level in the cleaning device 30 can be monitored, or the monitoring can be carried out by timing or other means. The vacuum pipeline system 50 and the storage device 10, i.e., the first vacuum pipeline 51, are controlled to be cut off, the third positive pressure pipeline 63 is controlled to be cut off, the storage device 10 and the cleaning liquid supply port are controlled to be cut off, the first positive pressure pipeline 61 is controlled to be conducted, the vacuum pipeline system 50 and the cleaning device 30 are controlled to be cut off, i.e., the third vacuum pipeline 53 is conducted, and the storage device 10 and the cleaning liquid return port, i.e., the fourth pipeline 33, are conducted.

[0113] The first positive pressure line 61 is opened, which increases the pressure inside the liquid storage device 10. The third vacuum line 53 is opened, which puts the cleaning device 30 in a negative pressure state. The sixth line 35 is opened, which allows the cleaning fluid to enter the cleaning device 30 through the sixth line 35 under the action of the pressure difference at both ends, so that the cleaning fluid carries the cleaned impurities out of the liquid storage device 10.

[0114] like Figure 10 As shown, according to the control method of this application embodiment, when adding electrolyte to the defoaming device 20, the vacuum pipeline system 50 is controlled to be connected to the defoaming device 20, and the liquid inlet pipeline 24 is controlled to be connected; during this process, the positive pressure pipeline system 60 can be connected to the liquid storage device 10, and the liquid storage device 10 can simultaneously add liquid to the battery without interfering with each other.

[0115] like Figure 11As shown, according to the control method of this application embodiment, the electrolyte in the defoaming device 20 can be vacuumed and stirred to remove bubbles, the vacuum pipeline system 50 and the defoaming device 20 can be connected, and the stirring component 23 can be operated; during this process, the positive pressure pipeline system 60 can be connected to the liquid storage device 10, and the liquid storage device 10 can simultaneously inject liquid into the battery without interfering with each other.

[0116] According to the control method of the present application embodiment, when the vacuum state of the defoaming device 20 is released, the positive pressure pipeline system 60 can be controlled to be connected to the defoaming device 20; during this process, the positive pressure pipeline system 60 can be connected to the liquid storage device 10, and the liquid storage device 10 can synchronously inject liquid into the battery without interfering with each other.

[0117] like Figure 12 As shown, according to the control method of this application embodiment, when the defoaming device 20 supplies liquid to the liquid storage device 10, the positive pressure pipeline system 60 is controlled to be connected to the defoaming device 20, and the defoaming device 20 and the liquid storage device 10 are controlled to be connected; during this process, the positive pressure pipeline system 60 can be connected to the liquid storage device 10, and the liquid storage device 10 can synchronously inject liquid into the battery without interfering with each other.

[0118] like Figure 14 As shown, according to the control method of this application embodiment, when adding cleaning fluid to the cleaning device 30, the vacuum pipeline system 50 is connected to the cleaning device 30, and the cleaning fluid inlet is opened.

[0119] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “” used herein may also indicate the inclusion of the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated, unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0120] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0121] The above are merely specific embodiments of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A self-cleaning fluid injection system, characterized in that, include: Liquid storage device for supplying liquid to external users; A defoaming device, connected to the liquid storage device, is used to supply liquid to the liquid storage device; The cleaning device includes a cleaning fluid inlet, a cleaning fluid supply port and a cleaning fluid return port connecting the storage device and / or the defoaming device. The liquid storage device and / or the defoaming device are provided with a liquid supply group, which is connected to the cleaning liquid supply port. The liquid supply group includes a spray pipe, which is located at the top of the liquid storage device and / or the defoaming device. The spray pipe includes at least one nozzle, and the outlet of the nozzle is opposite to the tank wall of the liquid storage device and / or the defoaming device to flush the tank wall. It also includes a vacuum piping system that is connected to the liquid storage device, the defoaming device and the cleaning device via pipes respectively; and a positive pressure piping system that is connected to the liquid storage device, the defoaming device and the cleaning device via pipes respectively; The vacuum pipeline system includes a first vacuum pipeline, a second vacuum pipeline, and a third vacuum pipeline. The first vacuum pipeline is connected to the liquid storage device, the second vacuum pipeline is connected to the defoaming device, and the third vacuum pipeline is connected to the cleaning device. The positive pressure pipeline system includes a first positive pressure pipeline, a second positive pressure pipeline, and a third positive pressure pipeline. The first positive pressure pipeline is connected to the liquid storage device, the second positive pressure pipeline is connected to the defoaming device, and the third positive pressure pipeline is connected to the cleaning device. The cleaning fluid supply port and the storage device are connected through a third pipeline; the storage device and the cleaning fluid return port are connected through a fourth pipeline; the cleaning fluid supply port and the defoaming device are connected through a fifth pipeline; and the defoaming device and the cleaning fluid return port are connected through a sixth pipeline. Electric valves are installed on the first vacuum line, the second vacuum line, the third vacuum line, the first positive pressure line, the second positive pressure line, the third positive pressure line, the third positive pressure line, the fourth positive pressure line, the fifth positive pressure line, and the sixth positive pressure line. When the cleaning fluid carrying the cleaned impurities flows out of the defoaming device, the electric valves on the second vacuum line, the third positive pressure line, and the fifth line are in the closed state, while the electric valves on the second positive pressure line, the third vacuum line, and the sixth line are in the open state. When the cleaning fluid carries the cleaned impurities out of the storage device, the electric valves on the first vacuum line, the third positive pressure line, and the third line are closed, while the electric valves on the first positive pressure line, the third vacuum line, and the fourth line are open. The included angle α between the nozzle portion and the axial direction of the liquid storage device and / or the defoaming device satisfies: 30°≤α≤60°; and / or the included angle β formed by the projection of the nozzle portion onto the radial cross-section of the liquid storage device and / or the defoaming device satisfies: 30°≤β≤60°.

2. The self-cleaning injection system according to claim 1, characterized in that, The spray pipe also includes a liquid supply section, which is annular, and multiple nozzle sections are disposed on the liquid supply section.

3. The self-cleaning injection system according to claim 1, characterized in that, The spray pipe is rotatably connected to the liquid storage device and / or the defoaming device. The liquid storage device and / or the defoaming device are also provided with a power unit, which is drivenly connected to the spray pipe to drive the spray pipe to rotate.

4. The self-cleaning injection system according to claim 3, characterized in that, The rotation axis of the spray pipe coincides with the rotation center axis of the liquid storage device and / or the defoaming device.

5. The self-cleaning injection system according to claim 1, characterized in that, Both the liquid storage device and the defoaming device include a tank, and the diameter of the side wall of the tank decreases gradually away from the bottom wall of the tank.

6. The self-cleaning injection system according to claim 1, characterized in that, The defoaming device is equipped with a stirring assembly, which includes a stirring rod with multiple blades extending in a spiral arrangement side by side.

7. The self-cleaning injection system according to claim 1, characterized in that, The first positive pressure pipeline, the second positive pressure pipeline, and the third positive pressure pipeline are each equipped with a pressure regulating valve and at least one first filter; and / or the defoaming device further includes a liquid inlet pipeline, one end of which is connected to the defoaming device and the other end is used to connect to a liquid supply device, and the liquid inlet pipeline is equipped with at least one second filter.

8. The self-cleaning injection system according to claim 7, characterized in that, The device includes a cabinet, and the liquid storage device, the defoaming device, and the cleaning device are all located inside the cabinet. The cleaning device is located below the defoaming device, and the height of the defoaming device is greater than the height of the liquid storage device.

9. The self-cleaning injection system according to claim 1, characterized in that, The liquid storage device is provided with a first discharge pipe at the bottom, and the defoaming device is provided with a second discharge pipe at the bottom. Both the first discharge pipe and the second discharge pipe are provided with a switch valve.

10. A control method for controlling the self-cleaning fluid injection system as described in any one of claims 1-9, characterized in that, include: The vacuum pipeline system is connected to the defoaming device, the third positive pressure pipeline is connected, and the defoaming device is connected to the cleaning fluid supply port. After the first moment of connection, the vacuum pipeline system is controlled to be cut off from the defoaming device, the third positive pressure pipeline is cut off, and the defoaming device and the cleaning fluid supply port are cut off. The second positive pressure pipeline is controlled to be connected, the vacuum pipeline system is connected to the cleaning device, and the defoaming device and the cleaning fluid return port are connected.

11. A control method for controlling the self-cleaning injection system as described in any one of claims 1-9, characterized in that, include: The vacuum pipeline system is connected to the liquid storage device, the third positive pressure pipeline is connected, and the liquid storage device is connected to the cleaning fluid supply port. After the second conduction time, the vacuum pipeline system is controlled to be cut off from the liquid storage device, the third positive pressure pipeline is cut off, and the liquid storage device and the cleaning fluid supply port are cut off. The first positive pressure pipeline is controlled to be connected, the vacuum pipeline system is connected to the cleaning device, and the liquid storage device and the cleaning fluid return port are connected.

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