Liquid injection method and liquid injection device

Abstract

The invention relates to a liquid injection method and device, and the method comprises the following steps: fixing a to-be-injected battery above a liquid storage bin, and enabling a liquid injection nozzle to be communicated with a liquid inlet of the battery; performing negative pressure exhaust treatment on the battery; pressure is applied to the liquid storage bin at first pressure intensity, and the first pressure intensity is larger than the internal pressure intensity of the liquid storage bin, so that at least part of the electrolyte in the liquid storage bin is pressed into the battery through the liquid injection nozzle; and reducing the pressure after maintaining the pressure for a preset time. According to the liquid injection method of the battery, when pressure is not applied to the liquid storage bin, the electrolyte in the liquid storage bin cannot flow out of the liquid injection nozzle, the liquid dropping phenomenon is avoided, waste cannot be caused, and the environment cannot be polluted. And meanwhile, the pipeline structure can be optimized, and arrangement of a valve in the prior art is omitted. The liquid injection process is controlled by controlling the pressure of the liquid storage bin, and the liquid injection precision and the liquid injection yield can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a liquid injection method and a liquid injection device. Background Art

[0002] During the battery production process, the electrolyte needs to be injected into the battery and fully infiltrate the positive and negative electrodes and the diaphragm. The control level of the injection process directly affects the performance of the battery. For hard-shell batteries, since the battery shell has no elasticity, some gas will be generated inside the battery during the injection process, resulting in the electrolyte not being successfully injected at one time. In order to ensure the infiltration effect of the electrolyte, cyclic injection is required.

[0003] The current existing lithium battery injection method is upper cup isobaric injection, that is, the injection device is placed above the battery. The electrolyte in the injection device flows into the battery under the action of gravity. At the same time, in order to achieve cyclic injection, a valve is usually set on the pipeline connecting the injection device to the battery, and the injection is controlled by controlling the opening and closing of the valve. However, controlling the valve not only makes the injection process control complicated, but also because the electrolyte is highly corrosive, as the use time increases, the sealing effect of the valve decreases, and leakage is prone to occur, which not only wastes electrolyte and causes environmental pollution, but also leads to reduced injection accuracy. Summary of the invention

[0004] In view of the above-mentioned technical problems, the present application provides a battery injection method to solve the leakage problem, improve the injection accuracy, optimize the pipeline structure, simplify the control steps and improve the stability and injection yield of the injection device. At the same time, the present application also provides an injection device, which specifically includes the following solutions:

[0005] In a first aspect, the present application provides a liquid injection method for a hard shell battery, comprising the following steps:

[0006] Fix the battery to be filled with liquid above the liquid storage bin, and connect the liquid filling nozzle with the liquid inlet of the battery;

[0007] Perform negative pressure exhaust treatment on the battery;

[0008] Applying a first pressure to the liquid storage bin, the first pressure being greater than the internal pressure of the liquid storage bin, so as to press at least part of the electrolyte in the liquid storage bin into the battery through the liquid injection nozzle;

[0009] Reduce the pressure after holding it for a preset time.

[0010] According to the battery injection method provided by the present application, the valve setting in the prior art is omitted. By setting the battery above the liquid storage bin along the direction of gravity, before the injection begins, the electrolyte stored in the liquid storage bin is always lower than the liquid inlet of the battery along the direction of gravity under the action of gravity, and the electrolyte will not flow into the battery or flow out from the injection nozzle. When the injection begins, the liquid storage bin is pressurized to force the electrolyte in the liquid storage bin into the battery. At the same time, before the liquid storage bin is pressurized, the battery is also subjected to negative pressure exhaust treatment, that is, the battery is vacuumized to make the inside of the battery at a low pressure level, which is conducive to subsequent injection. By applying pressure to the liquid storage bin at a first pressure greater than the internal pressure of the liquid storage bin, at least part of the electrolyte in the liquid storage bin is forced into the battery to achieve injection. Then the battery is subjected to a pressure-maintaining treatment to allow the electrolyte to fully infiltrate the battery.

[0011] It can be understood that the liquid injection method of the battery of the present application realizes that when the liquid storage tank is not pressurized, the electrolyte in the liquid storage tank will not flow out from the liquid injection nozzle, thereby not causing waste and not polluting the environment. At the same time, the present application sets the liquid storage tank below the battery, and by utilizing the weight of the electrolyte itself, it can prevent the electrolyte from automatically flowing into the battery; by applying pressure to the liquid storage tank, the pressure in the liquid storage tank is greater than the internal pressure of the battery, and can overcome the gravity of the electrolyte itself, so that the electrolyte is pressed into the battery, that is, the weight of the electrolyte itself and the pressure difference are used to adjust the start and stop of the liquid injection process, thereby optimizing the pipeline structure, eliminating the setting of the valve in the prior art and simplifying the control steps. And by controlling the pressure of the liquid storage tank, the liquid injection process can be controlled, which can improve the liquid injection accuracy and liquid injection yield.

[0012] In one embodiment, between applying pressure to the liquid storage tank at a first pressure and maintaining the pressure for a preset period of time and then reducing the pressure, the method further includes:

[0013] The liquid storage tank is pressurized with a second pressure which is greater than the first pressure, so as to press at least part of the electrolyte in the liquid storage tank into the battery through the liquid injection nozzle.

[0014] In this embodiment, after the liquid storage tank is pressurized with a first pressure, the electrolyte pressed into the battery may not be enough. The present application applies pressure to the liquid storage tank again with a second pressure greater than the first pressure to ensure that the liquid storage tank provides sufficient electrolyte to the battery, thereby improving the liquid filling effect on the battery.

[0015] In one embodiment, after the battery to be filled with liquid is fixed above the liquid storage bin and the liquid filling nozzle is connected with the liquid inlet of the battery, the method further includes:

[0016] Put the fixed battery to be filled with liquid and the liquid storage tank into the pressure container;

[0017] Negative pressure exhaust treatment of the battery, including:

[0018] Perform negative pressure exhaust treatment on pressure vessels;

[0019] Pressurizing the liquid storage tank at a first pressure includes:

[0020] The pressure container is pressurized with a first pressure; wherein the pressure container is connected to the battery and the liquid storage tank.

[0021] In this embodiment, after the battery to be filled with liquid is fixed and the filling nozzle of the liquid storage tank is connected with the liquid inlet of the battery, the battery and the liquid storage tank are placed in a pressure vessel, so as to utilize the pressure vessel to achieve negative pressure exhaust of the battery and pressurize the liquid storage tank. That is, it can be ensured that when the battery is negatively pressurized, the pressure difference between the inside and outside of the battery is small or even in the same negative pressure state, thereby preventing the battery from being deformed due to the large pressure difference between the inside and outside. It can be ensured that when the liquid storage tank is pressurized, the pressure difference between the outside of the battery and the inside and outside of the liquid storage tank is small or even in the same state, thereby preventing the sudden increase of the internal pressure of the battery, which may cause the battery to swell or bulge.

[0022] In one embodiment, between performing negative pressure exhaust treatment on the pressure container and applying pressure to the liquid storage tank at the first pressure, the method further includes:

[0023] The pressure is maintained for a preset time to keep the air pressure inside and outside the battery in the same negative pressure state.

[0024] In this embodiment, after the pressure container is vented with negative pressure, the pressure is maintained for a preset time to ensure that the air pressure inside and outside the battery is in the same negative pressure state, thereby improving the liquid injection yield of the battery.

[0025] In one embodiment, applying pressure to the liquid storage tank at a second pressure includes:

[0026] The second pressure is applied to the liquid storage tank, and the pressure in the liquid storage tank reaches 200kpa to 1000kpa.

[0027] In this embodiment, the second pressure is applied to the liquid storage tank, and the pressure in the liquid storage tank reaches 200 kPa to 1000 kPa, so as to ensure the liquid injection effect on the battery and the infiltration effect of the electrolyte.

[0028] In one embodiment, negative pressure exhaust treatment is performed on the battery, including:

[0029] The battery is subjected to negative pressure exhaust treatment, and the pressure inside the battery reaches -85kpa ​​~ -95kpa.

[0030] In this embodiment, the battery is subjected to negative pressure exhaust treatment, and the pressure in the battery is made to reach -85kpa ​​to -95kpa, which is beneficial to the subsequent battery injection and improves the battery injection effect.

[0031] In one embodiment, reducing the pressure after maintaining the pressure for a preset period of time includes:

[0032] After maintaining the pressure for a preset time, the pressure is reduced to normal pressure.

[0033] In one embodiment, between fixing the battery to be filled with liquid above the liquid storage bin and connecting the liquid filling nozzle with the liquid inlet of the battery, the following steps are included:

[0034] Adjust the position of the filling nozzle so that it is aligned with the battery's liquid inlet.

[0035] In this embodiment, the position of the liquid injection nozzle is adjusted so that the liquid injection nozzle is aligned with the liquid inlet of the battery, which is beneficial to improving the liquid injection accuracy of the battery.

[0036] In one embodiment, after adjusting the position of the liquid injection nozzle so that the liquid injection nozzle is aligned with the liquid inlet of the battery, the method further includes:

[0037] The liquid injection nozzle and the battery are driven to move relative to each other so as to insert the liquid injection nozzle into the liquid inlet of the battery.

[0038] In one embodiment, after the pressure is reduced after the preset pressure duration, the following steps are performed at least once in a cycle:

[0039] Perform negative pressure exhaust treatment on the battery;

[0040] Applying a first pressure to the liquid storage bin, the first pressure being greater than the internal pressure of the liquid storage bin, so as to press at least part of the electrolyte in the liquid storage bin into the battery through the liquid injection nozzle;

[0041] Applying a second pressure to the liquid storage tank, the second pressure being greater than the first pressure, so as to press at least part of the electrolyte in the liquid storage tank into the battery through the liquid injection nozzle;

[0042] Reduce the pressure after holding it for a preset time.

[0043] In this embodiment, the battery is vented with negative pressure, the liquid storage tank is pressurized with a first pressure, the liquid storage tank is pressurized with a second pressure, the pressure is maintained and then reduced, and the above process is repeated at least once to ensure that the bubbles in the battery are completely discharged and the injection effect is guaranteed.

[0044] In a second aspect, the present application provides a liquid injection device for a hard-shell battery, which is applied to the liquid injection method of the battery as described above, and the liquid injection device comprises: a fixing seat, a liquid storage tank, a liquid injection nozzle and a pressure assembly; the fixing seat is used to fix the battery to be injected, the liquid storage tank is located below the fixing seat, and the liquid injection nozzle is located above the fixing seat and is connected to the liquid storage tank;

[0045] When the battery to be filled is placed in the fixing seat and fixed, the filling nozzle is connected with the liquid inlet of the battery, and the pressure component is used to provide pressure to press the electrolyte stored in the liquid storage tank into the battery through the filling nozzle.

[0046] The liquid injection device of the present application sets the liquid storage tank below the fixing seat, and the battery to be injected is fixed above the fixing seat to ensure that the electrolyte in the liquid storage tank will not automatically flow into the battery under normal circumstances. At the same time, the pressure component is used to pressurize the liquid storage tank to force the electrolyte into the battery, that is, the liquid injection device of the present application uses the weight and pressure difference of the electrolyte itself to control the opening and closing of the electrolyte to replace the valve structure in the prior art, thereby solving the leakage problem, improving the injection accuracy, optimizing the pipeline structure, simplifying the control steps, and improving the stability of the liquid injection device and the injection yield.

[0047] In one embodiment, the pressure vessel includes a negative pressure pipeline, a normal pressure pipeline and a pressurized pipeline connected to the inner cavity of the pressure vessel.

[0048] In one embodiment, the liquid injection device includes an adjusting mechanism, which is fixedly connected to the liquid injection nozzle and slidably connected to the fixing seat for adjusting the position of the liquid injection nozzle. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0050] Figure 1 This is a schematic diagram of the structure of a liquid injection device provided in one embodiment of the present application;

[0051] Figure 2 This is a schematic diagram of the structure of a liquid injection device clamping a battery provided in one embodiment of the present application;

[0052] Figure 3 This is a schematic structural diagram of a liquid injection device provided in another embodiment of the present application;

[0053] Figure 4 A schematic diagram of the process steps of a battery injection method provided in one embodiment of the present application;

[0054] Figure 5 This is a schematic diagram of the process steps of the battery injection method provided in one embodiment of the present application after step S100;

[0055] Figure 6 This is a schematic diagram of the process steps of the battery injection method provided in one embodiment of the present application after step S300;

[0056] Figure 7 The figure is a schematic diagram of the process steps of a battery injection method provided in another embodiment of the present application.

[0057] Figure numbers: 200-battery; 210-liquid inlet; 100-liquid injection device; 10-fixed seat; 11-positioning groove; 12-accommodating chamber; 20-clamping mechanism; 21-clamping claw; 22-pressing block; 30-liquid injector; 31-liquid storage tank; 311-liquid outlet; 32-liquid injection nozzle; 33-liquid injection pipeline; 40-regulating mechanism; 50-pressure vessel; 51-negative pressure pipeline; 52-pressurization pipeline; 53-normal pressure pipeline. DETAILED DESCRIPTION

[0058] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thoroughly and comprehensively understood.

[0059] The following descriptions of the embodiments are with reference to the attached diagrams to illustrate specific embodiments that the present application can be used to implement. The serial numbers for the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present application, unless otherwise specified, include direct and indirect connections (couplings). The directional terms mentioned in the present application, such as "upper", "lower", "front", "back", "left", "right", "inside", "outside", "side", etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the present application, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application.

[0060] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be fixedly connected, detachably connected, or integrally connected; it can be mechanically connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances. It should be noted that the terms "first", "second", etc. in the specification and claims of this application and the drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including", "may include", "include", or "may include" used in this application indicate the existence of the corresponding functions, operations, elements, etc. disclosed, and do not limit one or more other functions, operations, elements, etc. In addition, the terms "including" or "include" indicate the existence of the corresponding features, numbers, steps, operations, elements, components, or combinations thereof disclosed in the specification, and do not exclude the existence or addition of one or more other features, numbers, steps, operations, elements, components, or combinations thereof, and are intended to cover non-exclusive inclusions.

[0061] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0062] It should be noted in advance that for hard-shell batteries (such as square-shell batteries or cylindrical batteries), since the battery shell has no elasticity, when a portion of the electrolyte is injected, the gas inside the battery shell will occupy the internal space of the shell, resulting in the electrolyte being unable to be successfully injected at one time. Therefore, hard-shell batteries must be cyclically injected. In the prior art, a control valve is required to control the stop flow of the electrolyte during cyclic injection. Therefore, in the process of cyclic injection, there must be a step to control the control valve. The present application controls the stop flow of the electrolyte by adjusting the weight of the electrolyte itself and the pressure difference, thereby replacing the valve structure in the prior art.

[0063] For details, please refer to Figure 1 and Figure 2 ,in Figure 1 This is a schematic structural diagram of a liquid injection device 100 provided in one embodiment of the present application; Figure 2 It is a schematic structural diagram of a liquid injection device 100 clamping a battery 200 provided in an embodiment of the present application.

[0064] like Figure 1 and Figure 2As shown, the liquid injection device 100 provided in the present application includes a fixed seat 10, a clamping mechanism 20 and a liquid injector 30. Among them, the clamping mechanism 20 and the liquid injector 30 are fixed to the fixed seat 10, and the clamping mechanism 20 is used to clamp and fix the battery 200. The liquid injector 30 includes a liquid storage tank 31, a liquid injection nozzle 32 and a liquid injection pipeline 33. The liquid storage tank 31 is located below the fixed seat 10, and the liquid injection nozzle 32 is located above the fixed seat 10. That is, along the direction of gravity, the liquid storage tank 31 is located below the liquid injection nozzle 32, and the liquid injection pipeline 33 connects the liquid injection nozzle 32 and the liquid storage tank 31. The liquid injection device 100 of the present application also includes a pressure component (not shown in the figure), and the liquid storage tank 31 is connected to the pressure component. When preparing to inject liquid into the battery 200, place the battery 200 into the fixing seat 10, clamp the battery with the clamping mechanism 20, and connect the injection nozzle 32 with the liquid inlet 210 of the battery. The pressure component is used to provide pressure so that the electrolyte stored in the liquid storage tank 31 flows into the battery 200 through the injection nozzle 32 under the action of the pressure difference.

[0065] exist Figure 1 In the embodiment shown, at least two positioning grooves 11 are provided on the fixing seat 10 of the present application, and at least two positioning grooves 11 are arranged side by side along the length direction of the fixing seat 10. Along the length direction of the fixing seat 10, the injection nozzle 32 is arranged on the same side of each positioning groove 11. When the battery 200 is placed in the fixing seat 10, it is placed in the positioning groove 11. The two positioning grooves 11 clamp the opposite ends of the battery 200.

[0066] In another embodiment, the number of the injection nozzles 32 and the positioning grooves 11 are both multiple, and the multiple injection nozzles 32 and the positioning grooves 11 are respectively arranged at intervals along the width direction of the fixing seat 10. Each injection nozzle 32 is used to cooperate with a positioning groove 11 and is used to inject liquid into a battery 200. That is, the injection device 100 of the present application can inject liquid into multiple batteries 200 at the same time, thereby improving the injection efficiency of the battery 200.

[0067] exist Figure 1 In the illustrated embodiment, the liquid storage bin 31 includes a liquid outlet 311 , which is located on a side of the liquid storage bin 31 facing the liquid injection nozzle 32 , and the liquid outlet 311 is connected to the liquid injection nozzle 32 via a liquid injection pipeline 33 .

[0068] In one embodiment, the bottom of the liquid storage tank 31 includes an inclined surface inclined toward the liquid outlet 311. Or it can be understood that, along the length direction of the fixed seat 10, the end of the liquid storage tank 31 close to the liquid injection nozzle 32 is lower than the end away from the liquid injection nozzle 32. It can be understood that in this embodiment, the bottom wall of the liquid storage tank 31 is set as an inclined surface inclined toward the liquid storage port, which is conducive to discharging the electrolyte into the liquid injection pipeline 33. In another embodiment, the bottom of the liquid storage tank 31 includes an arc surface, and the liquid outlet 311 is located at the top of the arc surface, which can also be conducive to discharging the electrolyte into the liquid injection pipeline 33.

[0069] Furthermore, the liquid injection device 100 of the present application further includes an adjustment mechanism 40, which is located on the same side of the positioning groove 11 as the liquid injection nozzle 32, and is connected between the fixing seat 10 and the liquid injection nozzle 32, and is used to adjust the position of the liquid injection nozzle 32. After the battery 200 is fixed to the fixing seat 10, the adjustment mechanism 40 can automatically adjust the position of the liquid injection nozzle 32, so that the liquid injection nozzle 32 is aligned with the liquid inlet 210 of the battery 200, which is conducive to the smooth communication between the liquid injection nozzle 32 and the liquid inlet 210.

[0070] In one embodiment, the adjustment mechanism 40 includes a vertical adjustment component and a horizontal adjustment component. The vertical adjustment component is used to adjust the displacement of the injection nozzle 32 in the vertical direction, and the horizontal adjustment component is used to adjust the displacement of the injection nozzle 32 in the horizontal direction. Through the cooperation of the vertical leveling component and the horizontal adjustment component, the injection nozzle 32 can be aligned with the liquid inlet 210 of the battery 200 in both the horizontal and vertical directions, which is conducive to improving the injection accuracy of the battery 200.

[0071] It is understandable that different types of batteries 200 have different sizes and different positions of the liquid inlet 210 of the battery 200. When different types of batteries 200 are fixed to the fixing seat 10, the adjustment mechanism 40 cooperates with the vertical adjustment component and the horizontal adjustment component to align the liquid injection nozzle 32 with the liquid inlet 210 of different batteries 200, so that the liquid injection device of the present application can be compatible with batteries 200 of more types and sizes.

[0072] exist Figure 2 In the illustrated embodiment, the liquid injection device 100 of the present application further includes a clamping mechanism 20, which includes a clamping jaw 21, one end of which is rotatably connected to the fixing seat 10, and the clamping jaw 21 is used to clamp the side walls of multiple batteries 200 to limit the displacement of the batteries 200 in the horizontal direction. After the battery 200 is placed in the positioning groove 11, the clamping jaw 21 rotates and contacts the side wall of the battery 200. And as the clamping jaw 21 continues to rotate, the clamping jaw 21 pushes the battery 200 to move toward the liquid injection nozzle 32 along the length direction of the fixing seat 10, so that the liquid injection nozzle 32 is inserted into the liquid inlet 210 of the battery 200. When the liquid injection nozzle 32 is connected to the liquid inlet 210, the clamping jaw 21 stops rotating and forms a limit to limit the displacement of the battery 200 in the horizontal direction.

[0073] In one embodiment, the clamping mechanism 20 further includes a pressing block 22, which is movably connected to the fixing seat 10 to further limit the movement of the battery 200. After the clamping jaws 21 clamp the side wall of the battery 200, the pressing block 22 rotates relative to the fixing seat 10 and contacts the top surface or bottom surface of the battery 200 in the vertical direction. The pressing block 22 forms a vertical limit for the battery 200, which is used to limit the displacement of the battery 200 in the vertical direction.

[0074] In one embodiment, the clamping mechanism 20 is provided with an elastic layer (not shown), which provides a buffering effect to prevent the clamping mechanism 20 from scratching or squeezing the battery 200 and causing damage to the battery 200 when the clamping mechanism 20 contacts the battery 200 .

[0075] Please see Figure 3 The structure diagram of the liquid injection device 100 provided in another embodiment of the present application is shown.

[0076] like Figure 1 and Figure 3 As shown, in one embodiment, the pressure assembly of the present application includes a pressure container 50. The fixing seat 10 and the injector 30 are both accommodated in the pressure container 50, that is, the fixing seat 10, the liquid storage tank 31 and the injection nozzle 32 are all accommodated in the pressure container 50. The pressure container 50 can provide a vacuum environment or a pressure environment for the injection process of the battery 200 according to a preset program, so that the electrolyte in the liquid storage tank 31 is injected into the battery 200.

[0077] In one embodiment, the pressure vessel 50 includes a negative pressure pipeline 51, a pressurized pipeline 52, and a normal pressure pipeline 53. By opening the corresponding pipelines, the pressure in the pressure vessel 50 can be controlled. For example, when the negative pressure pipeline 51 is opened, the inner cavity of the pressure vessel 50 is evacuated, so that the pressure vessel 50 is in a negative pressure state. When the pressurized pipeline 52 is opened, a protective gas can be introduced into the pressure vessel 50 to increase the pressure in the inner cavity of the pressure vessel 50. When the normal pressure pipeline 53 is opened, the pressure in the pressure vessel 50 can be adjusted to normal pressure.

[0078] exist Figure 1 and Figure 3 In the illustrated embodiment, the fixing seat 10 is fixed in the pressure vessel 50, and the battery 200 to be filled with liquid, the liquid storage tank 31, etc. are all accommodated in the pressure vessel 50, so that when the battery 200 is filled with liquid, the internal pressure and the external pressure of the battery 200 are in a balanced state, thereby avoiding the expansion of the battery 200 and avoiding the leakage of the battery 200, and at the same time, the infiltration speed of the electrolyte in the battery 200 can be increased.

[0079] It should be noted that the above embodiment, the pressure container 50 can be used as a pressure component to provide pressure to the liquid storage tank 31 and the battery 200 is only an exemplary introduction, that is, in some other embodiments of the present application, there may be other implementations. For example, only the battery 200 can be set in the pressure container 50, and the liquid storage tank 31 can be set outside the pressure container 50, and the pressure components such as a pressure tank or a piston can be used to provide the same pressure to the liquid storage tank 31, which can also prevent the battery 200 from expanding.

[0080] In one embodiment, a receiving cavity 12 is provided inside the fixing seat 10, and the liquid storage bin 31 is disposed in the receiving cavity 12. It can be understood that disposing the liquid storage bin 31 in the receiving cavity 12 of the fixing seat 10 can make the structure of the liquid injection device 100 of the present application more compact, thereby reducing the volume of the liquid injection device 100 of the present application.

[0081] In another embodiment, the liquid storage tank 31 and the fixing seat 10 are configured as an integral structure. That is, the electrolyte can be directly stored in the receiving cavity 12 of the fixing seat 10. In order to prevent the electrolyte from corroding the fixing seat 10, the inner wall of the receiving cavity 12 can be coated with a corrosion-resistant material.

[0082] It should be noted that, in the above-mentioned embodiment, the positional relationship between the liquid storage tank 31 and the fixed seat 10 is only introduced as an example, that is, the liquid storage tank 31 may not be arranged in the receiving cavity 12 of the fixed seat 10, and may be arranged at intervals on the side of the fixed seat 10. As long as the liquid level of the electrolyte in the liquid storage tank 31 is ensured to be lower than the liquid injection nozzle 32, the present application does not make any special limitation on this.

[0083] Please see Figure 4 FIG. 1 is a schematic diagram of the process steps of a method for injecting liquid into a battery 200 provided in one embodiment of the present application.

[0084] like Figure 4 As shown, the present application also provides a method for injecting liquid into a battery 200, which is based on the injection device 100 provided in the above embodiment. The method for injecting liquid into a battery 200 of the present application specifically includes the following steps:

[0085] S100, fix the battery 200 to be filled with liquid above the liquid storage bin 31, and connect the liquid filling nozzle 32 with the liquid inlet 210 of the battery 200;

[0086] Specifically, in this step, please cooperate with Figure 1 As shown, based on the liquid storage bin 31 being located below the positioning groove 11, the battery 200 to be filled with liquid can first be placed in the positioning groove 11 by a manipulator, and the battery 200 to be filled with liquid can be initially fixed by the positioning groove 11. Then, the positions of the liquid injection nozzle 32 and the liquid inlet 210 of the battery 200 are adjusted, and the liquid injection nozzle 32 and the liquid inlet 210 of the battery 200 are connected, so as to prepare for the liquid injection of the battery 200.

[0087] Please see Figure 5 The figure shows a schematic diagram of the process steps of the liquid injection method of the battery 200 provided in one embodiment of the present application after step S100.

[0088] In one embodiment, after "fixing the battery 200 to be filled with liquid above the liquid storage bin 31" in step S100, the battery 200 filling method of the present application may further include:

[0089] S150 , adjusting the position of the liquid injection nozzle 32 so that the liquid injection nozzle 32 is aligned with the liquid inlet 210 of the battery 200 .

[0090] Please cooperate with us for details. Figure 2 As shown, the liquid injection device 100 of the present application includes an adjustment mechanism 40, which is located on the same side of the positioning groove 11 as the liquid injection nozzle 32. The adjustment mechanism 40 is connected between the fixing seat 10 and the liquid injection nozzle 32, and is used to adjust the position of the liquid injection nozzle 32. That is, after the battery 200 is initially fixed by the positioning groove 11, the adjustment mechanism 40 can automatically adjust the position of the liquid injection nozzle 32 so that the liquid injection nozzle 32 is aligned with the liquid inlet 210 of the battery 200, which is conducive to the smooth connection between the liquid injection nozzle 32 and the liquid inlet 210, and can improve the liquid injection accuracy of the battery 200.

[0091] Furthermore, the adjustment mechanism 40 includes a vertical adjustment component and a horizontal adjustment component. The vertical adjustment component is used to adjust the displacement of the injection nozzle 32 in the vertical direction, and the horizontal adjustment component is used to adjust the displacement of the injection nozzle 32 in the horizontal direction. By controlling the cooperation of the vertical leveling component and the horizontal adjustment component, the injection nozzle 32 can be aligned with the liquid inlet 210 of the battery 200 in both the horizontal and vertical directions, so that the injection device of the present application can be compatible with batteries 200 of more models and sizes.

[0092] Please see Figure 5 In one embodiment, after “adjusting the position of the injection nozzle 32 so that the injection nozzle 32 is aligned with the liquid inlet 210 of the battery 200” in step S150, the method of the present application may further include the following steps:

[0093] S160 , driving the liquid injection nozzle 32 and the battery 200 to move relative to each other, so as to insert the liquid injection nozzle 32 into the liquid inlet 210 of the battery 200 .

[0094] Please cooperate with us for details. Figure 2 As shown, the clamping mechanism 20 includes a clamping jaw 21, one end of which is rotatably connected to the fixing seat 10, and the clamping jaw 21 is used to clamp the side walls of multiple batteries 200 to limit the displacement of the batteries 200 in the horizontal direction. After the battery 200 is placed in the positioning groove 11, and the adjustment mechanism 40 aligns the injection nozzle 32 with the liquid inlet 210 of the battery 200, the clamping jaw 21 rotates and contacts the side wall of the battery 200. As the clamping jaw 21 continues to rotate, the clamping jaw 21 pushes the battery 200 to move toward the injection nozzle 32 along the length direction of the fixing seat 10, so that the injection nozzle 32 is inserted into the liquid inlet 210 of the battery 200. When the injection nozzle 32 is connected to the liquid inlet 210, the clamping jaw 21 stops rotating and forms a limit to limit the displacement of the battery 200 in the horizontal direction.

[0095] In another embodiment, the clamping mechanism 20 further includes a pressing block 22, which is movably connected to the fixing seat 10 and is used to further limit the movement of the battery 200. After the clamping jaws 21 clamp the side wall of the battery 200, the pressing block 22 rotates relative to the fixing seat 10 and contacts the top surface or bottom surface of the battery 200 in the vertical direction. The pressing block 22 forms a vertical limit for the battery 200 and is used to limit the displacement of the battery 200 in the vertical direction. Then, the clamp continues to rotate and pushes the battery 200 to move toward the injection nozzle 32 along the length direction of the fixing seat 10, so that the injection nozzle 32 is inserted into the liquid inlet 210 of the battery 200. At this time, the positioning groove 11 can play a guiding role to avoid the misalignment of the injection nozzle 32 and the liquid inlet 210.

[0096] S200, performing negative pressure exhaust treatment on the battery 200;

[0097] Specifically, in this step, the battery 200 is subjected to negative pressure exhaust treatment, that is, the battery 200 is subjected to vacuum treatment to exhaust the gas in the battery 200 and make the interior of the battery 200 at a negative pressure level, which is beneficial to the subsequent liquid injection.

[0098] S300, applying pressure to the liquid storage tank 31 at a first pressure, the first pressure being greater than the internal pressure of the liquid storage tank 31, so as to press at least part of the electrolyte in the liquid storage tank 31 into the battery 200 through the liquid injection nozzle 32;

[0099] Specifically, in this step, based on the fact that the liquid storage tank 31 is located below the liquid injection nozzle 32 along the direction of gravity, the liquid storage tank 31 is pressurized with a first pressure greater than the internal pressure of the liquid storage tank 31 so that the electrolyte in the liquid storage tank 31 overcomes its own gravity and is transported to the liquid injection nozzle 32 through the liquid injection pipeline 33, and then injected into the battery 200.

[0100] S400, after maintaining the pressure for a preset period of time, the pressure is reduced.

[0101] It can be understood that by maintaining the pressure for a period of time and then reducing the pressure, the electrolyte injected into the battery 200 can fully infiltrate the battery 200, thereby improving the injection effect.

[0102] In the prior art liquid injection device, the liquid storage tank for storing electrolyte is generally located above the battery liquid injection nozzle, and the liquid injection nozzle is connected to the inside of the battery. After opening the valve, under the action of gravity, the electrolyte in the liquid storage tank flows into the battery through the liquid injection nozzle, and the valve is closed, and the electrolyte stops flowing in, that is, the prior art controls the stop of the electrolyte by controlling the on and off of the valve. And the clamping mechanism in the prior art is divided into an upper clamp and a lower clamp, and the upper clamp and the lower clamp are used to clamp the battery, and the liquid storage tank is usually an integrated structure with the upper clamp. When it is necessary to inject liquid into the battery to be injected, the battery is first placed in the lower clamp, and then the upper clamp is aligned with the lower clamp. In this process, due to the process error between the upper clamp and the lower clamp, it is easy to cause the liquid injection nozzle to pierce the liquid inlet. In the liquid injection process of the prior art, due to the strong corrosiveness of the electrolyte to the valve, the reliability of the liquid injection is reduced, and leakage is easy to occur, which not only wastes electrolyte but also causes environmental pollution, and also leads to reduced injection accuracy.

[0103] According to the liquid injection method of the battery 200 provided by the present application, the valve setting in the prior art is omitted. By setting the battery 200 above the liquid storage tank 31 along the gravity direction, before the liquid injection begins, the electrolyte stored in the liquid storage tank 31 is always lower than the liquid inlet 210 of the battery 200 under the action of gravity along the gravity direction, and the electrolyte will not flow into the battery 200 or flow out from the liquid injection nozzle 32. When the liquid injection begins, the liquid storage tank 31 is pressurized, and the electrolyte in the liquid storage tank 31 can be pressed into the battery 200. At the same time, before the liquid storage tank 31 is pressurized, the battery 200 is also subjected to negative pressure exhaust treatment, that is, the battery 200 is vacuumized to make the inside of the battery 200 at a low pressure level, which is conducive to the subsequent liquid injection. By applying pressure to the liquid storage tank 31 at a first pressure greater than the internal pressure of the liquid storage tank 31, at least part of the electrolyte in the liquid storage tank 31 is pressed into the battery 200 to achieve liquid injection. Then, the battery 200 is subjected to a pressure-maintaining treatment so that the electrolyte can fully infiltrate the battery 200 .

[0104] It can be understood that the liquid injection method of the battery 200 of the present application realizes that when the liquid storage tank 31 is not pressurized, the electrolyte in the liquid storage tank 31 will not flow out from the liquid injection nozzle 32, thereby not causing waste and not polluting the environment. At the same time, the present application sets the liquid storage tank 31 below the battery 200, and by utilizing the weight of the electrolyte itself, the electrolyte can be prevented from automatically flowing into the battery 200; by applying pressure to the liquid storage tank 31, the pressure in the liquid storage tank 31 is greater than the internal pressure of the battery 200, and the gravity of the electrolyte itself can be overcome, so that the electrolyte is pressed into the battery 200, that is, the weight of the electrolyte itself and the pressure difference adjustment method are used to control the start and stop of the liquid injection process, thereby optimizing the pipeline structure, eliminating the setting of the valve in the prior art and simplifying the control steps. And by controlling the pressure of the liquid storage tank 31, the liquid injection process can be controlled, and the liquid injection accuracy and liquid injection yield can be improved. In addition, due to the effect of the gravity of the electrolyte itself, it will not accumulate at the liquid injection nozzle 32 to form crystals, thereby avoiding clogging the liquid injection pipeline 33.

[0105] Please see Figure 6 The figure shows a schematic diagram of the process steps of the liquid injection method of the battery 200 provided in one embodiment of the present application after step S300.

[0106] like Figure 6 As shown, in one embodiment, after step S300 of "pressurizing the liquid storage tank 31 with a first pressure, the first pressure being greater than the internal pressure of the liquid storage tank 31, so as to press at least part of the electrolyte in the liquid storage tank 31 into the battery 200 through the liquid injection nozzle 32", the method of the present application further includes:

[0107] S350 , applying pressure to the liquid storage tank 31 at a second pressure, where the second pressure is greater than the first pressure, so as to press at least part of the electrolyte in the liquid storage tank 31 into the battery 200 through the liquid injection nozzle 32 .

[0108] It can be understood that in this embodiment, after the liquid storage tank 31 is pressurized with a first pressure, the electrolyte pressed into the battery 200 may be insufficient. The present application applies pressure to the liquid storage tank 31 again with a second pressure greater than the first pressure to ensure that the liquid storage tank 31 provides sufficient electrolyte to the battery 200, thereby improving the injection effect of the battery 200 and increasing the infiltration speed of the electrolyte.

[0109] Please see Figure 7 FIG. 1 is a schematic diagram of the process steps of a method for injecting liquid into a battery 200 provided in another embodiment of the present application.

[0110] like Figure 7As shown, in one embodiment, after step S100 of "fixing the battery 200 to be filled with liquid above the liquid storage bin 31, and connecting the liquid filling nozzle 32 with the liquid inlet 210 of the battery 200", the method of the present application may further include the following steps:

[0111] S170, placing the fixed battery 200 to be filled with liquid and the liquid storage tank 31 into the pressure container 50;

[0112] Specifically, the pressure vessel 50 includes a negative pressure pipeline 51, a pressurized pipeline 52, and a normal pressure pipeline 53. By opening the corresponding pipelines, the pressure in the pressure vessel 50 can be controlled. For example, when the negative pressure pipeline 51 is opened, the inner cavity of the pressure vessel 50 is evacuated, so that the pressure vessel 50 is in a low pressure state. When the pressurized pipeline 52 is opened, a protective gas can be introduced into the pressure vessel 50 to increase the pressure in the inner cavity of the pressure vessel 50. When the normal pressure pipeline 53 is opened, the pressure in the pressure vessel 50 can be adjusted to normal pressure.

[0113] It can be understood that the present application places the fixed battery 200 to be filled with liquid and the liquid storage tank 31 into the pressure vessel 50, so as to utilize the pressure vessel 50 to provide a corresponding pressure environment for the filling process of the battery 200. When the battery 200 is filled with liquid, the internal and external pressures of the battery 200 are in a relatively balanced state, thereby avoiding expansion of the battery 200 and leakage of the battery 200, and at the same time increasing the infiltration speed of the electrolyte in the battery 200.

[0114] In one embodiment, for step S200 “performing negative pressure exhaust treatment on the battery 200”, the present application may adopt the following method:

[0115] S200a, performing negative pressure exhaust treatment on the pressure container 50.

[0116] Specifically, the negative pressure pipeline 51 is opened to evacuate the pressure container 50 so that the pressure is in a negative pressure state. Since the pressure container 50 is connected to the liquid storage tank 31 and the inside of the battery 200, the battery 200 is evacuated so that the inside of the battery 200 is in a negative pressure state, so that the gas in the battery 200 is exhausted, which is beneficial for the subsequent liquid injection of the battery 200.

[0117] exist Figure 7 In the embodiment shown, for the step S300 of "pressurizing the liquid storage tank 31 with a first pressure, the first pressure being greater than the internal pressure of the liquid storage tank 31, so as to press at least part of the electrolyte in the liquid storage tank 31 into the battery 200 through the liquid injection nozzle 32", the present application may adopt the following methods:

[0118] S300a, applying pressure to the pressure container 50 at a first pressure; wherein the pressure container 50 is connected to the battery 200 and the liquid storage tank 31 .

[0119] Specifically, in this embodiment, based on the connection between the pressure container 50 and the interior of the battery 200 and the liquid storage tank 31, the normal pressure pipeline 53 of the pressure container 50 is opened, and the pressure container 50 is pressurized with a first pressure, that is, the liquid storage tank 31 is pressurized with a first pressure, so that the electrolyte in the liquid storage tank 31 is pressed into the interior of the battery 200.

[0120] Please look back Figure 5 In one embodiment, after step S200 of "performing negative pressure exhaust treatment on the battery 200", the method of the present application further includes:

[0121] S250 , maintaining the pressure for a preset time period so that the air pressure inside and outside the battery 200 is in the same negative pressure state.

[0122] It can be understood that in this embodiment, after the battery 200 is subjected to negative pressure exhaust treatment, the battery 200 is pressurized for a period of time to ensure that the air pressure inside and outside the battery 200 is in the same negative pressure state, thereby improving the injection yield of the battery 200.

[0123] Please see Figure 6 In one embodiment, for the step S350 of "pressurizing the liquid storage tank 31 with a second pressure, the second pressure being greater than the first pressure, so as to press at least part of the electrolyte in the liquid storage tank 31 into the battery 200 through the liquid injection nozzle 32", the method of the present application can also be carried out in the following manner:

[0124] S350a, applying pressure to the liquid storage tank 31 with a second pressure, and making the pressure in the liquid storage tank 31 reach 200 kPa to 1000 kPa.

[0125] Specifically, in this embodiment, the pressure vessel 50 can be pressurized by the pressurizing pipeline 52 to apply a pressure of 200 kPa to 1000 kPa to the liquid storage tank 31, thereby ensuring the injection effect of the battery 200 and the infiltration effect of the electrolyte. After the pressurization is completed, the pressure is maintained for a period of time, and then the battery 200 is taken out.

[0126] In one embodiment, for the “performing negative pressure exhaust treatment on the battery 200” in step S200, the method of the present application may be implemented as follows:

[0127] S200b, perform negative pressure exhaust treatment on the battery 200, and make the pressure inside the battery 200 reach -85kpa ​​~ -95kpa.

[0128] Specifically, in one embodiment, when the negative pressure pipeline 51 is used to evacuate the pressure vessel 50, the pressure in the pressure vessel 50 is evacuated to -85kPa to -95kPa, which is beneficial for the subsequent injection of liquid into the battery 200, so as to improve the injection effect of the battery 200. Then, the evacuation is stopped, and the pressure is maintained for a period of time, so that the internal pressure of the uninjected battery 200 is consistent with the pressure in the pressure vessel 50.

[0129] In one embodiment, for step S400 of “maintaining the pressure for a preset period of time and then reducing the pressure”, the method of the present application may further include:

[0130] S400a, after maintaining the pressure for a preset period of time, the pressure is reduced to normal pressure.

[0131] Specifically, after the preset pressure-maintaining time period ends, the normal pressure pipeline 53 in the pressure container 50 can be opened, so that the pressure in the pressure container 50 can be slowly reduced to return to the normal pressure state.

[0132] In one embodiment, after step S400 of “maintaining the pressure for a preset period of time and then reducing the pressure”, the following steps are executed at least once in a loop:

[0133] Performing negative pressure exhaust treatment on the battery 200;

[0134] Applying a first pressure to the liquid storage tank 31 , the first pressure being greater than the internal pressure of the liquid storage tank 31 , so as to press at least part of the electrolyte in the liquid storage tank 31 into the battery 200 through the liquid injection nozzle 32 ;

[0135] Applying a second pressure to the liquid storage tank 31, the second pressure being greater than the first pressure, so as to press at least part of the electrolyte in the liquid storage tank 31 into the battery 200 through the liquid injection nozzle 32;

[0136] Reduce the pressure after holding it for a preset time.

[0137] It can be understood that in this embodiment, by negatively venting the battery 200, pressurizing the liquid storage tank 31 with a first pressure, pressurizing the liquid storage tank 31 with a second pressure, maintaining the pressure and then reducing the pressure, and cycling the above process at least once, it can be ensured that the gas in the battery 200 is completely discharged, and at the same time, it can be ensured that the electrolyte is completely injected into the battery 200 and fully infiltrates the battery 200.

[0138] It should be understood that the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0139] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0140] It should be understood that the application of this application is not limited to the above examples. For ordinary technicians in this field, they can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the claims attached to this application. Ordinary technicians in this field can understand that all or part of the processes of the above embodiments are implemented, and equivalent changes made according to the claims of this application still fall within the scope covered by this application.

Claims

1. A liquid injection method for a hard shell battery, characterized in that: The steps include: Fix the battery to be injected with liquid above the liquid storage bin, and connect the injection nozzle with the liquid inlet of the battery; Performing negative pressure exhaust treatment on the battery; Applying a first pressure to the liquid storage tank, wherein the first pressure is greater than the internal pressure of the liquid storage tank, so as to press at least part of the electrolyte in the liquid storage tank into the battery through the liquid injection nozzle; Reduce the pressure after holding it for a preset time.

2. The liquid injection method according to claim 1, characterized in that: Between applying pressure to the liquid storage tank at the first pressure and reducing the pressure after maintaining the pressure for a preset time, the method further includes: The liquid storage tank is pressurized with a second pressure, which is greater than the first pressure, so as to press at least part of the electrolyte in the liquid storage tank into the battery through the liquid injection nozzle.

3. The liquid injection method according to claim 1, characterized in that: After the battery to be injected is fixed above the liquid storage bin and the injection nozzle is connected with the liquid inlet of the battery, the method further includes: Putting the fixed battery to be injected with liquid and the liquid storage tank into a pressure container; The negative pressure exhaust treatment of the battery comprises: Performing negative pressure exhaust treatment on the pressure vessel; The step of applying pressure to the liquid storage tank at a first pressure includes: The pressure container is pressurized with the first pressure; wherein the pressure container is connected to the battery and the liquid storage tank.

4. The liquid injection method according to claim 3, characterized in that: Between the negative pressure exhaust treatment of the pressure container and the pressurization of the liquid storage tank at the first pressure, the method further includes: The pressure is maintained for a preset time so that the air pressure inside and outside the battery is in the same negative pressure state.

5. The liquid injection method according to any one of claims 2 to 4, characterized in that: The step of applying pressure to the liquid storage tank at a second pressure includes: The liquid storage tank is pressurized with the second pressure, and the pressure in the liquid storage tank reaches 200 kPa to 1000 kPa.

6. The liquid injection method according to any one of claims 1 to 4, characterized in that: The negative pressure exhaust treatment of the battery comprises: The battery is subjected to negative pressure exhaust treatment, and the pressure inside the battery is made to reach -85 kPa to -95 kPa.

7. The liquid injection method according to any one of claims 1 to 4, characterized in that: The step of reducing the pressure after maintaining the pressure for a preset period of time includes: After the pressure is maintained for a preset period of time, the pressure is reduced to normal pressure.

8. The liquid injection method according to any one of claims 1 to 4, characterized in that: Between fixing the battery to be injected with liquid above the liquid storage bin and connecting the injection nozzle with the liquid inlet of the battery, the method includes: The position of the liquid injection nozzle is adjusted so that the liquid injection nozzle is aligned with the liquid inlet of the battery.

9. The liquid injection method according to claim 8, characterized in that: After adjusting the position of the liquid injection nozzle so that the liquid injection nozzle is aligned with the liquid inlet of the battery, the method further includes: The liquid injection nozzle and the battery are driven to move relative to each other so as to insert the liquid injection nozzle into the liquid inlet of the battery.

10. The liquid injection method according to claim 2, characterized in that: After the pressure is reduced after the preset pressure holding time, the following steps are performed at least once in a cycle: Performing negative pressure exhaust treatment on the battery; Applying a first pressure to the liquid storage tank, wherein the first pressure is greater than the internal pressure of the liquid storage tank, so as to press at least part of the electrolyte in the liquid storage tank into the battery through the liquid injection nozzle; Applying pressure to the liquid storage tank at a second pressure, the second pressure being greater than the first pressure, so as to press at least part of the electrolyte in the liquid storage tank into the battery through the liquid injection nozzle; Reduce the pressure after holding it for a preset time.

11. A liquid injection device for a hard shell battery, characterized in that: include: A fixing seat, a liquid storage tank, a liquid injection nozzle and a pressure assembly; the fixing seat is used to fix the battery to be injected, the liquid storage tank is located below the fixing seat, and the liquid injection nozzle is located above the fixing seat and is connected to the liquid storage tank; When the battery to be filled is placed in the fixing seat and fixed, the filling nozzle is connected to the liquid inlet of the battery, and the pressure component is used to provide pressure to press the electrolyte stored in the liquid storage tank into the battery through the filling nozzle.

12. The liquid injection device according to claim 11, characterized in that: The pressure assembly comprises a pressure container, and the fixing seat, the liquid storage bin and the liquid injection nozzle are all accommodated in the pressure container.

13. The liquid injection device according to claim 12, characterized in that: The pressure container comprises a negative pressure pipeline, a normal pressure pipeline and a pressurized pipeline connected to the inner cavity of the pressure container.

14. The liquid injection device according to claim 11, characterized in that: The liquid injection device comprises an adjusting mechanism, which is fixedly connected to the liquid injection nozzle and slidably connected to the fixing seat, and is used for adjusting the position of the liquid injection nozzle.

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