Blocking rod and anti-dripping liquid injection device

Abstract

The utility model discloses a blocking rod and an anti-dripping liquid injection device. The blocking rod comprises a supporting framework and an elastic layer, and the outer surface of the supporting framework is wrapped with the elastic layer; the blocking rod is used for blocking the liquid injection opening of the liquid injection sleeve cup. The liquid injection device comprises a liquid injection sleeve cup and the blocking rod, a liquid injection opening is formed in the bottom of the liquid injection sleeve cup, and the blocking rod is arranged above the liquid injection opening and can move close to or away from the liquid injection opening so as to block or open the liquid injection opening. The plugging rod can tightly plug the liquid injection opening of the liquid injection sleeve cup, so that when the liquid injection sleeve cup is separated from a battery cell, the plugging rod can effectively prevent residual electrolyte in the cup from dripping; the blocking rod adopts the combined arrangement of the supporting framework and the elastic layer, the stability and strength of the structure of the blocking rod are guaranteed, meanwhile, good sealing performance and adaptability are provided, and it is guaranteed that the blocking rod is tightly attached to the liquid injection opening.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery production, in particular to a plugging rod and a liquid injection device capable of preventing liquid dripping. BACKGROUND

[0002] In the production process of lithium ion batteries, the liquid injection machine is one of the key production equipment, which is responsible for accurately injecting electrolyte into the battery cell. During the liquid injection process, the electrolyte is first injected into the injection sleeve cup, and then flows into the battery cell through the injection port at the bottom of the sleeve cup.

[0003] However, in the existing production process, especially at the sleeve cup dismounting station after liquid injection, there is a significant problem: when the injection sleeve cup is separated from the battery cell, if the electrolyte in the sleeve cup does not completely flow into the cell, but some is left over, these residual electrolyte may drip due to gravity, vibration or improper operation during the separation process. Electrolyte dripping not only causes pollution in the production site, affecting the cleanliness of the working environment, but also may cause corrosion and damage to the liquid injection machine and other production equipment, reducing the service life of the equipment.

[0004] In order to solve this problem, the traditional method is to add a liquid suction device at the sleeve cup dismounting station. The liquid suction device usually includes one or more liquid suction pumps to generate negative pressure to suck out the residual liquid in the sleeve cup. However, it may not be effective for some hard-to-reach corners in the sleeve cup, resulting in electrolyte dripping when the sleeve cup is separated from the battery cell. CONTENT OF THE INVENTION

[0005] In order to overcome at least one of the defects of the prior art described above, one of the purposes of the present application is to provide a plugging rod which has strong stability and strength, can provide good sealing and adaptability, and ensure close fitting with the injection port.

[0006] The second purpose of the present application is to provide a liquid injection device capable of effectively preventing the dripping of residual electrolyte in the cup, while reducing installation and maintenance costs.

[0007] One of the technical solutions adopted by the present application to solve the problem is:

[0008] A plugging rod, comprising a support framework and an elastic layer, the elastic layer being wrapped around the outer surface of the support framework; the plugging rod is used to plug the injection port of the injection sleeve cup.

[0009] As a preferred technical solution of the present application, the support framework comprises a rod body and a rod head, the rod head being detachably connected to the bottom of the rod body; the rod head is used to plug the injection port of the injection sleeve cup.

[0010] As a preferred technical solution of the present application, the rod body is provided with a first threaded part, and the rod head is provided with a second threaded part which is screwed with the first threaded part.

[0011] As a preferred technical solution of the present application, the cross section of the rod body and / or the rod head is circular, and the outer periphery of the rod body and / or the rod head is provided with a friction limiting part.

[0012] As a preferred technical solution of the present application, the friction limiting part is a flat surface which is arranged on both sides of the lower end of the rod body and / or both sides of the upper end of the rod head.

[0013] The second technical solution adopted by the present application to solve the problem is:

[0014] A liquid injection device capable of preventing liquid dripping includes a liquid injection sleeve cup and the plug rod as described above. The bottom of the liquid injection sleeve cup is provided with a liquid injection port, and the plug rod is arranged above the liquid injection port and can move close to or away from the liquid injection port to block or open the liquid injection port.

[0015] As a preferred technical solution of the present application, the liquid injection sleeve cup includes a cup body and a cup cover which is connected to the upper end of the cup body. The cup cover is provided with a connecting port, and the upper end of the plug rod passes through the connecting port.

[0016] As a preferred technical solution of the present application, the upper end of the plug rod is provided with a driving member which is used to drive the plug rod to move up and down.

[0017] As a preferred technical solution of the present application, the driving member is connected with a connecting plate, and a plurality of plug rods are connected to the connecting plate and are arranged at intervals along the length direction of the connecting plate.

[0018] As a preferred technical solution of the present application, the liquid injection port is provided with a liquid injection nozzle, and the lower end of the liquid injection nozzle is provided with a sealing ring.

[0019] In summary, the plug rod and the liquid injection device capable of preventing liquid dripping provided by the present application have the following technical effects:

[0020] 1) By adopting the plug rod design combining the supporting framework and the elastic layer, the stability and strength of the structure are ensured, the plug rod can closely fit the shape and size of the liquid injection port to form an effective sealing layer, and good sealing performance can be maintained even after multiple uses, effectively preventing liquid leakage.

[0021] 2) The movable arrangement of the plug rod makes it easy to switch between close to and away from the liquid injection port, and the operation is simple and quick, without the need for additional liquid suction devices or manual wiping steps, significantly improving work efficiency.

[0022] 3) The liquid injection device of the present application has simple structure, low manufacturing cost, and is easy to maintain and replace, which helps to reduce production cost; by preventing the dripping of electrolyte, the safety hazard caused by electrolyte leakage is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The structure schematic diagram of the plug rod of the embodiment of the present application is shown in the figure;

[0024] Figure 2 The structure schematic diagram of the liquid injection sleeve cup and the plug rod when assembled is shown in the figure;

[0025] Figure 3 The longitudinal section structure schematic diagram of the liquid injection sleeve cup of the embodiment of the present application is shown in the figure;

[0026] Figure 4 The structure schematic diagram of the liquid injection device of the embodiment of the present application is shown in the figure;

[0027] Figure 5 The structure schematic diagram of the plug rod of the embodiment of the present application after hiding the rod head is shown in the figure.

[0028] Among them, the meaning of the reference signs is as follows:

[0029] 1, plug rod; 11, rod body; 12, rod head; 13, friction limiting part; 14, connecting disc; 2, liquid injection sleeve cup; 21, liquid injection port; 22, cup body; 23, cup cover; 24, connecting port; 25, liquid injection nozzle; 251, liquid injection channel; 26, sealing ring; 27, air vent; 3, driving member; 31, connecting plate. DETAILED DESCRIPTION

[0030] In order to better understand and implement, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application.

[0031] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer” and the like are based on the orientations or positional relationships shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application.

[0033] Embodiment one

[0034] Referring to Figure 1 The application discloses a plug rod 1, which comprises a support framework and an elastic layer, specifically, the elastic layer is wrapped on the outer surface of the support framework; and the plug rod 1 is used for plugging the liquid injection port 21 of a liquid injection sleeve 2.

[0035] On the basis of the structure, referring to Figure 3 When the plug rod 1 of the application is used, it can be arranged in the liquid injection sleeve 2. When the liquid injection sleeve 2 is completed, the lower end of the plug rod 1 is aligned with the liquid injection port 21 of the liquid injection sleeve 2, and the plug rod 1 is ensured to be vertically aligned with the liquid injection port 21; then the position of the plug rod 1 is adjusted, the plug rod 1 is pushed into the liquid injection port 21 until the elastic layer completely covers and tightly adheres to the inner surface of the liquid injection port 21, so that the liquid injection port 21 is plugged.

[0036] The elastic layer can be a rubber layer, a silica gel layer or the like, and the support framework can be made of stainless steel, nickel-titanium alloy or the like. The plug rod 1 is formed by wrapping the elastic layer on the outer side of the support framework, specifically, the support framework provides sufficient structural strength, so that the plug rod 1 can maintain a stable posture when being inserted and pulled out. At the same time, the elastic layer plays a role in its material properties, and the elastic layer deforms elastically under the extrusion of the support framework and the inner wall of the liquid injection port 21, thereby filling the gap between the plug rod 1 and the liquid injection port 21, so that a good sealing effect is formed between the plug rod 1 and the liquid injection port 21. It should be noted that due to the deformation characteristics of the elastic layer, the plug rod 1 also has good adaptability and can be applied to liquid injection ports 21 of different sizes.

[0037] In addition, the plug rod 1 needs to be frequently inserted and pulled out to plug or open the liquid injection port 21; the plug rod 1 of the application allows it to be repeatedly used after being properly cleaned, thereby reducing the use cost and reducing the generation of waste.

[0038] As a preferred technical solution of the application, the support framework comprises a rod body 11 and a rod head 12, and the rod head 12 is detachably connected to the bottom of the rod body 11. The rod head 12 is used for plugging the liquid injection port 21 of the liquid injection sleeve 2.

[0039] On the basis of the structure, when in use, the connected plug rod 1 (especially the rod head 12 part) is aligned with the liquid injection port 21 of the liquid injection sleeve 2, the direction of the plug rod 1 is adjusted and appropriate force is applied, the rod head 12 is inserted into the liquid injection port 21 until a predetermined sealing depth is reached.

[0040] The detachable head 12 is designed to adapt the plug rod 1 to liquid injection ports 21 of different sizes and shapes; different specifications of head 12 can be replaced to meet the plugging requirements of different liquid injection sleeve cups 2, which helps to achieve closer fitting and higher sealing performance.

[0041] In addition, as the part directly in contact with the liquid injection port 21, the head 12 may be worn out due to frequent use, and the detachable design of the head 12 and the rod body 11 allows the head 12 and the rod body 11 to be replaced and maintained separately, so that even if one of the components is worn or damaged, the entire plug rod 1 does not need to be replaced. This helps to reduce the cost of use and prolong the overall service life of the plug rod 1.

[0042] At the same time, in order to reduce the friction between the head 12 and the edge of the liquid injection port 21 when inserting and pulling out the liquid injection port 21, the lower end of the head 12 is designed in a semispherical shape, so that the head 12 can better adapt to the shape of the liquid injection port 21, especially when the edge of the liquid injection port 21 is relatively smooth or slightly arc-shaped. And this shape reduces the possibility of jamming during insertion and removal.

[0043] As a preferred technical solution of the present application, the rod body 11 is provided with a first threaded portion, and the head 12 is provided with a second threaded portion corresponding to the first threaded portion, and the second threaded portion is screwed with the first threaded portion.

[0044] Based on this structure, when assembling, the head 12 is placed close to the rod body 11, and the second threaded portion is aligned with the first threaded portion; then the head 12 (or the rod body 11) is rotated, so that the second threaded portion gradually screws into the first threaded portion until a predetermined fastening degree is reached. In use, the assembled plug rod 1 is aligned with the liquid injection port 21 of the liquid injection sleeve cup 2, and the head 12 is inserted into the liquid injection port 21.

[0045] The threaded connection design makes the connection between the rod body 11 and the head 12 more secure and reliable, reducing the risk of sealing failure due to loosening or falling off during use.

[0046] In addition, one or more elastic washers, such as silicone or rubber washers, can be added between the head 12 and the rod body 11. These washers play a buffering and sealing role when threaded, which can further improve the sealing performance and reduce loosening due to vibration or impact. At the same time, the elastic washer can also disperse the stress at the threaded connection, prolonging the service life.

[0047] As a preferred technical solution of the present application, the cross-sectional shape of the rod body 11 and / or the head 12 is circular, and the outer periphery of the rod body 11 and / or the head 12 is provided with a friction limiting portion 13.

[0048] On the basis of the structure, when disassembling, the friction limiting part 13 can be clamped by a wrench, a clamp and the like, and the rod head 12 (or the rod body 11) is rotated in a forward direction or a reverse direction by a tool, so that the second threaded part is gradually screwed into or out of the first threaded part.

[0049] The rod body 11 and the rod head 12 can be provided in a cylindrical shape, so that the force acting on the plug rod 1 can be uniformly distributed, stress concentration is reduced, and the strength and durability of the overall structure are improved. It should be noted that the friction limiting part 13 can be a non-slip pattern, a protrusion, a groove and the like, which is arranged on the outer periphery of the rod body 11 or the rod head 12, can increase the contact area and friction between the rod head 12 or the rod body 11 and the tool, thereby preventing the tool from slipping relative to the outer periphery of the cylindrical rod head 12 or the rod body 11 during tightening or loosening, so that the disassembly of the rod head 12 and the rod body 11 is more convenient.

[0050] As a preferred technical solution of the present application, referring to Figure 1 and Figure 5 , the friction limiting part 13 is a flat surface, and the flat surface is arranged on both sides of the lower end of the rod body 11 and / or both sides of the upper end of the rod head 12.

[0051] On the basis of the structure, when disassembling, the two clamping arms of the wrench or other clamps are respectively abutted on the flat surfaces on both sides of the lower end of the rod body 11 or both sides of the upper end of the rod head 12, then the two clamping arms are close to each other to clamp the rod body 11 or the rod head 12, and the rod head 12 (or the rod body 11) is rotated in a forward direction or a reverse direction by a wrench, so that the second threaded part is gradually screwed into or out of the first threaded part.

[0052] The flat surface is arranged on both sides of the lower end of the rod body 11 and / or both sides of the upper end of the rod head 12, so that the outer periphery of the lower end of the rod body 11 or the upper end of the rod head 12 presents an arc surface and a flat surface, and there is a corner at the connection between the flat surface and the arc surface. The corner can form good contact and engagement between the tool and the plug rod.

[0053] Correspondingly, the cross section of the lower end of the rod body 11 or the upper end of the rod head 12 presents a polygonal shape, and the edges of the polygonal shape include straight line segments and arc lines. Compared with a circular shape, the polygonal shape is more easily and stably clamped by a wrench or other clamps, reducing the sliding or falling phenomenon caused by unstable clamping during rotation. This stability can ensure the smooth progress of the disassembly process and improve work efficiency.

[0054] In addition, the plug rod 1 can also be directly provided in a polygonal column, the outer periphery of the rod head 12 and the rod body 11 presents a flat surface and a flat surface, and the cross section of the rod head 12 and the rod body 11 presents a polygonal shape; in this way, the clamping efficiency and stability can also be improved.

[0055] Embodiment Two

[0056] Different from Embodiment One, this embodiment discloses a liquid injection device for preventing liquid dripping, referring to Figure 2 , the liquid injection device comprises a liquid injection sleeve cup 2 and the plug rod 1 in Embodiment One, wherein, referring to Figure 3 , the bottom of the liquid injection sleeve cup 2 is provided with a liquid injection port 21, and the plug rod 1 is arranged above the liquid injection port 21 and can move close to or away from the liquid injection port 21 to block or open the liquid injection port 21.

[0057] On the basis of this structure, when using the liquid injection device of the present application, during liquid injection, first, the liquid injection port 21 of the liquid injection sleeve cup 2 is aligned with the liquid injection position of the battery cell, and the liquid injection sleeve cup 2 is fixed to prevent it from moving during the liquid injection process. Then, the plug rod 1 is pushed away from the liquid injection port 21 to open the liquid injection port 21, so that the electrolyte in the liquid injection sleeve cup 2 can flow into the battery cell through the liquid injection port 21. After completing the liquid injection, the plug rod 1 is quickly pressed down to be close to and tightly fit on the liquid injection port 21, thereby blocking the liquid injection port 21.

[0058] Among them, the existence of the elastic layer outside the plug rod 1 enables the plug rod 1 to tightly fit on the liquid injection port 21, and through the blocking of the plug rod 1 and the sealing of the elastic layer, the liquid injection device can effectively prevent the electrolyte from dripping out of the liquid injection port 21 after liquid injection, protecting the safety of the working environment and the battery cell.

[0059] As a preferred technical solution of the present application, the liquid injection sleeve cup 2 comprises a cup body 22 and a cup cover 23, and the cup cover 23 is connected to the upper end of the cup body 22. Among them, the cup cover 23 is provided with a connecting port 24, and the upper end of the plug rod 1 passes out through the connecting port 24.

[0060] On the basis of this structure, during assembly, the lower end of the plug rod 1 is inserted into the liquid injection sleeve cup 2 until the bottom of the rod head 12 is close to the liquid injection port 21. Then, the upper end of the plug rod 1 is inserted through the connecting port 24 on the cup cover 23 to ensure that the plug rod 1 can move freely in the connecting port 24 without being hindered. During use, the plug rod 1 is lifted upward by external operation (such as manual operation, mechanical driving or automatic control) to move away from the liquid injection port 21, thereby opening the liquid injection port 21, and the electrolyte in the liquid injection sleeve cup 2 can flow into the battery cell through the liquid injection port 21. After completing the liquid injection, the plug rod 1 is quickly pushed back to the original position to tightly fit on the liquid injection port 21, and a seal is formed by the elastic layer to prevent the electrolyte from dripping. After confirming that the plug rod 1 has completely blocked the liquid injection port 21, the liquid injection sleeve cup 2 and the battery can be separated.

[0061] The cup cover 23 is further arranged to enhance the sealing performance of the liquid injection sleeve cup 2. Specifically, the cup cover 23 can prevent external air or impurities from entering the liquid injection sleeve cup 2 through the connecting port 24, thereby ensuring the cleanliness and safety of the liquid injection process. The connecting port 24 is arranged to make the installation and removal of the plug rod 1 more convenient; the operator only needs to move the plug rod 1 up and down to open and block the liquid injection port 21, without complicated operation steps.

[0062] In addition, the cup cover 23 is further provided with a vent 27. Before liquid injection, the vent 27 can be connected with a suction tube of a vacuum pump or a syringe to extract air in the liquid injection sleeve cup 2 and form a vacuum environment. Then, the electrolyte is added to the liquid injection sleeve cup 2 through the connecting port 24, and then the lower end of the plug rod 1 is inserted into the connecting port 24 and enters the liquid injection sleeve cup 2. When the cup cover 23 and the cup body 22 are in an assembled state, the plug rod 1 can enter and exit from the connecting port 24 of the cup cover 23.

[0063] During the liquid injection process, as the electrolyte gradually flows from the liquid injection sleeve cup 2 into the battery cell, the liquid level in the liquid injection sleeve cup 2 will decrease, which may cause a negative pressure (relative to the external environment) to be formed inside. The negative pressure state will affect the smooth flow of the electrolyte. After the vent 27 is detached from the suction tube of the vacuum pump or the syringe, the vent 27 allows external air to automatically enter the liquid injection sleeve cup 2 when the negative pressure is formed, thereby maintaining the balance between the internal and external pressures and ensuring the smooth progress of the liquid injection process.

[0064] As a preferred technical solution of the present application, the upper end of the plug rod 1 is provided with a driving member 3, and the driving member 3 is used to drive the plug rod 1 to move up and down.

[0065] Based on the above structure, the driving member 3 can be a motor driving structure, which specifically includes a motor and a transmission mechanism. The transmission mechanism connects the motor and the plug rod 1, and can be a gear transmission, a lead screw transmission or a connecting rod mechanism, which can be used to convert the rotary motion of the motor into the linear motion of the plug rod 1. In use, the motor converts the rotary motion into the linear motion of the plug rod 1 through the transmission mechanism, drives the plug rod 1 to move upward or downward, so that the plug rod 1 moves upward to open the liquid injection port 21, and moves downward to block the liquid injection port 21 after the liquid injection is completed.

[0066] In addition, the driving member 3 can also be a pneumatic driving structure, which specifically includes a pneumatic cylinder, and the piston rod of the pneumatic cylinder is connected with the plug rod 1. The extension and retraction of the pneumatic cylinder can drive the plug rod 1 to move up and down.

[0067] Thus, the driving member 3 drives the plug rod 1 to move up and down without manual operation, improving the automation degree of the liquid injection process. The rotation angle of the motor or the extension amount of the cylinder can be accurately controlled to accurately control the position of the plug rod 1, thereby ensuring the accuracy of the liquid injection amount. Meanwhile, the accurate control of the plug rod 1 avoids the safety problems such as electrolyte leakage caused by improper manual operation.

[0068] As a preferred technical solution of the present application, referring to Figure 4 The power output end of the driving member 3 is connected with a connecting plate 31, and a plurality of plug rods 1 are connected to the connecting plate 31 and are arranged at intervals along the length direction of the connecting plate 31.

[0069] On the basis of this structure, during assembly, the plurality of battery cells are first placed at corresponding positions so that their liquid injection ports 21 are aligned with the bottom of the liquid injection sleeve cup 2. Then, the plurality of plug rods 1 are installed at intervals along the length direction of the connecting plate 31 to ensure that each plug rod 1 can correspond to one liquid injection port 21. Finally, the connecting plate 31 is firmly connected to the power output end of the driving member 3 to ensure that the connecting plate 31 and the plug rods 1 can move stably during driving.

[0070] The connecting plate 31 is provided with mounting holes, the upper end of the plug rod 1 is connected with a connecting disc 14 after passing through the mounting hole, the connecting disc 14 is fixedly connected with the connecting plate 31, and the lower end of the plug rod 1 extends into the liquid injection sleeve cup 2 through the connecting port 24 on the cup cover 23 of the liquid injection sleeve cup 2.

[0071] During use, the driving member 3 is started to drive the connecting plate 31 and the plurality of plug rods 1 thereon to move upward at the same time, so that all the plug rods 1 are away from the liquid injection ports 21, thereby simultaneously opening the plurality of liquid injection ports 21. At this time, the liquid injection device can inject electrolyte into the plurality of battery cells at the same time. After completing the liquid injection, the driving member 3 is started again to drive the connecting plate 31 and the plurality of plug rods 1 thereon to move downward at the same time, so that all the plug rods 1 are tightly attached to the corresponding liquid injection ports 21, thereby achieving simultaneous plugging.

[0072] In this way, the movement of the plurality of plug rods 1 is synchronously driven through one connecting plate 31, so that the opening and plugging of the plurality of liquid injection ports 21 can be controlled at the same time, and the plurality of battery cells can be injected at the same time, thereby greatly shortening the overall liquid injection time and improving the production efficiency.

[0073] In addition, since all the plug rods 1 and the liquid injection ports 21 are controlled and operated at the same time, it can be ensured that the liquid injection amount and the liquid injection time of each battery cell remain consistent, thereby improving the consistency of the product and reducing the waste and rework phenomenon in the production process.

[0074] As a preferred technical solution of the present application, the liquid injection port 21 is provided with a liquid injection nozzle 25, and the lower end of the liquid injection nozzle 25 is provided with a sealing ring 26.

[0075] On the basis of the structure, when assembling, first install the liquid injection nozzle 25 at the liquid injection port 21, and then install the sealing ring 26 on the outer periphery of the lower end of the liquid injection nozzle 25. Specifically, the sealing ring 26 can be fixed on the liquid injection nozzle 25 by press fitting or clamping groove. When installing, make sure that the sealing ring 26 completely covers the outer periphery of the lower end of the liquid injection nozzle 25, and there is no misplacement or missing installation.

[0076] When using the liquid injection device, align the liquid injection nozzle 25 with the liquid injection hole of the battery, then insert the liquid injection nozzle 25 into the liquid injection hole of the battery, and make sure that the sealing ring 26 is in close contact with the liquid injection hole of the battery. Then drive the plug rod 1 away from the liquid injection port 21 by the driving member 3, and the liquid injection sleeve cup 2 injects electrolyte into the battery cell through the liquid injection port 21 and the liquid injection nozzle 25.

[0077] Among them, the liquid injection nozzle 25 is provided with a liquid injection channel 251, when the plug rod 1 moves upward away from the liquid injection port 21, the electrolyte in the liquid injection sleeve cup 2 can flow out through the liquid injection port 21 and the liquid injection channel 251; when the plug rod 1 is inserted into the liquid injection port 21, the plug rod 1 blocks the liquid inlet end of the liquid injection channel 251, at this time the liquid injection sleeve cup 2 can be detached from the battery, without electrolyte dripping.

[0078] In addition, the main function of the sealing ring 26 is to ensure the sealing between the liquid injection nozzle 25 and the liquid injection hole of the battery, to prevent the leakage of electrolyte during the liquid injection process. At the same time, good sealing makes the liquid injection process more stable and controllable, improves the precision and efficiency of liquid injection, and also reduces the rework and waste caused by leakage.

[0079] The technical means disclosed in the application scheme is not limited to the technical means disclosed in the above embodiments, but also includes the technical solutions composed of any combination of the above technical features. It should be noted that for ordinary skilled persons in the art, without departing from the principles of the present application, some improvements and refinements can also be made, which are also considered within the scope of protection of the present application.

Claims

1. A plug rod, characterized in that: The plug rod includes a support frame and an elastic layer, the elastic layer covering the outer surface of the support frame; the plug rod is used to seal the injection port of the injection cup; the support frame includes a rod body and a rod head, the rod head being detachably connected to the bottom of the rod body; the rod head is used to seal the injection port of the injection cup.

2. The plug rod according to claim 1, characterized in that: The rod body is provided with a first threaded portion, and the rod head is provided with a second threaded portion, the second threaded portion being screwed to the first threaded portion.

3. The plug rod according to claim 2, characterized in that: The cross-sectional shape of the rod body and / or the rod head is circular, and a friction limiting part is provided on the outer periphery of the rod body and / or the rod head.

4. The plug rod according to claim 3, characterized in that: The friction limiting part is a flat surface, which is disposed on both sides of the lower end of the rod and / or both sides of the upper end of the rod head.

5. A drip-proof liquid injection device, characterized in that: The device includes an injection cup and a plugging rod as described in any one of claims 1-4. The injection cup has an injection port at its bottom, and the plugging rod is positioned above the injection port and can move closer to or further away from the injection port to block or open the injection port.

6. The liquid injection device according to claim 5, characterized in that: The liquid injection cup includes a cup body and a cup lid, with the cup lid connected to the upper end of the cup body; the cup lid is provided with a connection port, through which the upper end of the plug rod protrudes.

7. The liquid injection device according to claim 5, characterized in that: The upper end of the blocking rod is provided with a driving component, which is used to drive the blocking rod to move up and down.

8. The liquid injection device according to claim 7, characterized in that: The power output end of the drive component is connected to a connecting plate, and a plurality of the plug rods are connected to the connecting plate, with the plurality of plug rods spaced apart along the length direction of the connecting plate.

9. The liquid injection device according to claim 5, characterized in that: The injection port is equipped with an injection nozzle, and a sealing ring is provided on the lower outer periphery of the injection nozzle.

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