Exhaust and liquid injection device for lithium battery

Abstract

The utility model discloses a lithium battery exhaust and liquid injection device which comprises a shell with two opposite open ends, a pressing head which is coaxially assembled in the shell from one end of the shell and can move back and forth along the axis direction of the shell, and an elastic device which is arranged in the pressing head and is used for resetting the pressing head, the pressing head is provided with a nozzle internally provided with a first one-way valve, and the shell is provided with a liquid injection hole and a battery liquid injection / exhaust hole connected with the battery liquid injection hole; an adjusting knob is assembled at the other end of the shell, the adjusting knob is provided with three hole channels, a second one-way valve is assembled in each hole channel, and when the adjusting knob is rotated to a preset position, one hole channel is connected with the liquid injection hole or the battery liquid injection / exhaust hole. According to the utility model, the integrated operation of exhausting and liquid injection of the lithium battery can be realized, exhausting and liquid injection are carried out in the same cavity, other foreign gases cannot enter the cavity, waste gas in the battery can be completely exhausted, and primary liquid injection and secondary liquid injection of the lithium battery can be completed.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery exhaust and liquid injection, in particular to a lithium battery exhaust and liquid injection device. Background Art

[0002] The role of lithium battery electrolyte is to conduct ions between the positive and negative electrodes and act as a medium for charging and discharging, just like human blood. In order to ensure battery performance, the electrolyte needs to be fully and evenly infiltrated into the lithium battery. After the first injection of the battery, the battery is formed, which produces waste gas and consumes electrolyte, which requires exhaust and secondary injection. In this process, moisture and oxygen are not allowed to enter. Therefore, exhaust and injection are two key processes in lithium battery production, and the operation directly affects the production efficiency and quality of the battery. The current mainstream injection methods are negative pressure injection and isobaric injection, but no matter which one, the principle is the same, that is, to draw negative pressure to the battery, and then use the pressure difference between the inside and outside of the battery cell to drive the electrolyte into the battery cell. The exhaust method is mostly achieved by drawing negative pressure on the battery. Most of the existing equipment is large-scale equipment or equipment with separate exhaust and injection functions, which is mostly used for exhaust and injection of large quantities of lithium batteries, with complex structure and high cost.

[0003] CN203826458U discloses a lithium battery exhaust valve, including an exhaust cavity penetrating the upper cover of the battery shell and a valve cover covering the exhaust cavity, the top of the valve cover is an exhaust port connected to the exhaust cavity, the bottom of the exhaust cavity is an air inlet connected to the inside of the battery shell, and the exhaust cavity is sequentially provided with exhaust blocks that can move along the axis of the exhaust cavity and a spring that can be extended and retracted with the movement of the exhaust top block from the inside of the battery shell to the outside. Under normal conditions, the exhaust top block just blocks the air inlet. When the air pressure inside the lithium battery shell reaches a certain value, the exhaust top block is pushed up by the air pressure, so that the channel for exhausting from the inside of the lithium battery to the outside is opened, and the gas is discharged smoothly. When the gas is partially discharged, the air pressure inside the lithium battery drops, and the exhaust top block is pushed down and reset due to the elastic performance of the spring. The device can only exhaust but not inject liquid, and can only discharge the gas in the battery with a pressure higher than the elastic force of the spring, and cannot discharge all the exhaust gas. In addition, the exhaust cavity of the device is a non-sealed cavity, which is easy to mix with other gases or moisture, affecting the safety of the battery.

[0004] CN220086333U discloses a lithium battery liquid injection machine, which includes a transmission wheel rotatably connected to the inner wall of the frame, a conveyor belt is arranged on the outer wall of the transmission wheel, a clamping plate is bonded to the top of the conveyor belt, a placement plate is clamped and connected between the two clamping plates, a placement groove is provided on the inner wall of the top of the placement plate, and a guide plate is welded on the inner wall of the frame; an air extraction structure is used to extract air from the inside of the lithium battery, and is fixedly installed on the top of the frame; and a liquid injection structure is used to inject liquid into the inside of the lithium battery, and the liquid injection structure is fixedly installed on the top of the frame. When working, the placement plate is located on the guide plate, and the air extraction structure extracts air from the battery in the placement groove. After the air extraction is completed, the transmission wheel drives the placement plate to move forward, so that the lithium battery in the placement groove moves to the right below the liquid injection mechanism, and the liquid injection port is aligned with the opening position of the lithium battery, and then the water pump injects the liquid in the electrolyte storage tank into the lithium battery to complete the liquid injection. However, the exhaust and injection of this equipment are not carried out in the same cavity. After exhaust, the battery cavity is under negative pressure. When moving forward to the injection position, other gases are easily inhaled, affecting the subsequent injection and battery safety. In addition, this equipment adopts belt drive and has a small load, so it is not suitable for larger batteries. The equipment structure is relatively complex and the cost is high, so it is impossible to exhaust and inject liquid into small batches of batteries. Utility Model Content

[0005] The purpose of the utility model is to overcome the deficiencies and defects of the prior art and to provide a lithium battery exhaust and liquid injection device.

[0006] A lithium battery exhaust and liquid injection device comprises a shell with openings at two opposite ends, a pressing head coaxially assembled in the shell by one end of the shell and capable of moving back and forth along the axial direction of the shell, an elastic device arranged in the pressing head for resetting the pressing head, the pressing head having a nozzle with a first one-way valve arranged therein, the shell being provided with an injection hole and a battery injection / exhaust hole connected to the battery injection hole; an adjusting knob being assembled at the other end of the shell, the adjusting knob having three channels, each of the channels being equipped with a second one-way valve, and when the adjusting knob is rotated to a predetermined position, one of the channels is connected to the injection hole or the battery injection / exhaust hole.

[0007] Wherein, the first one-way valve and / or the second one-way valve adopts a ball, and the ball can be raised and lowered in the nozzle / channel along the axial direction of the nozzle / channel to realize the opening / closing of the nozzle / channel.

[0008] Wherein, the inner wall of the pressing head is provided with a limiting platform of an elastic device, one end of the elastic device is limited by the limiting platform, and the other end is limited by the inner side of the adjusting knob.

[0009] Among them, the outer diameter of the shell assembly part of the pressing head is smaller than the outer diameter of its main body, and the outer wall of the shell assembly part of the pressing head is connected to the inner wall surface of the shell through a corrugated sealing rubber sleeve, and the end of the corrugated sealing rubber sleeve close to the adjusting knob extends out of the end of the shell assembly part and is arranged in the shell.

[0010] Wherein, the outer inner diameter of the inner wall of the adjusting knob matching portion of the shell is smaller than the inner inner diameter, and the adjusting knob is rotatably assembled in the large inner diameter area.

[0011] Wherein, a sealing ring is arranged between the inner end of the adjusting knob and the small inner diameter area of ​​the shell.

[0012] Wherein, the elastic device is a spring.

[0013] The nozzle is provided with a rotatable switch knob for controlling the nozzle to be opened / closed so as to be connected / disconnected with the outside.

[0014] Wherein, an orifice is arranged at an eccentric position of the end surface of the switch knob, and when the switch knob rotates around the axis of the nozzle, the orifice can be connected / disconnected with the nozzle.

[0015] Wherein, a rotating handle is arranged on the end side of the adjusting knob.

[0016] The lithium battery exhaust and liquid injection device of the utility model can realize the integrated operation of exhausting and liquid injection of lithium batteries. Exhaust and liquid injection are carried out in the same cavity, and other impurity gases will not enter. The exhaust gas in the battery can be completely discharged, and the primary liquid injection and secondary liquid replenishment of the lithium battery can be completed. The structure is simple, the operation is convenient, and the cost is low. It is suitable for exhausting and liquid injection of small batches of square batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a cross-sectional view of the exhaust mode of the lithium battery exhaust and liquid injection device of the utility model.

[0018] Figure 2 It is a cross-sectional view of the lithium battery exhaust and liquid injection device of the utility model in the liquid injection mode.

[0019] Figure 3 The utility model is an axonometric view of the regulating knob of the lithium battery exhaust and liquid injection device.

[0020] Figure 4 This is an exploded view of the lithium battery exhaust and liquid injection device of the utility model.

[0021] Figure 5 This is an axonometric view of the appearance of the lithium battery exhaust and liquid injection device after assembly. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0023] like Figures 1 to 5 As shown, the battery exhaust and liquid injection device of the embodiment of the utility model comprises a shell 7 with openings at two opposite ends, a pressing head 1 which is coaxially assembled in the shell by one end of the shell and can move back and forth along the axial direction of the shell 7, and an elastic device 6 arranged in the pressing head for resetting the pressing head, the pressing head has a nozzle 3 with a first one-way valve 2 arranged therein, the shell is provided with an injection hole 8 and a battery injection / exhaust hole 9 connected to the battery injection hole; the other end of the shell is equipped with an adjusting knob 11, the adjusting knob has three channels, each of the channels is equipped with a second one-way valve, and when the adjusting knob 11 is rotated to a predetermined position, one of the channels is connected to the injection hole 8 or the battery injection / exhaust hole 9.

[0024] In the above-mentioned embodiments, the three channels are evenly distributed on the circumferential side wall of the cylindrical adjustment knob at a rotation angle of 90°. The three second one-way valves are respectively the first channel one-way valve 13, the second channel one-way valve 14, and the third channel one-way valve 15. Correspondingly, preferably, the injection hole 8 and the battery injection / exhaust hole 9 connected to the battery injection hole are symmetrically arranged on the circumferential side wall of the shell. The battery injection / exhaust hole 9 is an exhaust hole when the battery exhaust and injection device of the utility model is in the exhaust state, and is an injection hole when in the injection mode. Optionally, the three channels on the adjustment knob are arranged on the circumferential side wall of the adjustment knob, and the axial direction thereof is consistent with the radial direction of the adjustment knob.

[0025] The utility model utilizes the movement of the elastic device to change the pressure in the sealed cavity to complete exhaust and liquid injection, adopts a one-way valve to prevent gas and liquid backflow, and uses an adjusting knob to complete the mode conversion of exhaust and liquid injection.

[0026] In an optional or preferred embodiment, the first one-way valve and / or the second one-way valve adopts a ball, and the ball can rise and fall in the nozzle / channel along the axial direction of the nozzle / channel to realize the opening / closing of the nozzle / channel. In order to cooperate with the lifting of the ball, the nozzle / channel is designed to be conical, and when the ball is in a small aperture position, the nozzle / channel can be closed, and vice versa, the nozzle / channel can be opened to facilitate the flow of gas or liquid.

[0027] Optionally, the elastic device 6 is a spring or a similar resetting elastic device, preferably a spring. Optionally, the inner wall of the pressing head 1 has a limit platform of the elastic device, one end of the elastic device 6 is limited by the limit platform, and the other end is limited by the inner side of the adjusting knob 11.

[0028] In an optional embodiment, the outer diameter of the shell assembly part of the pressing head 1 is smaller than the outer diameter of its main body, and the outer wall of the shell assembly part of the pressing head is connected to the inner wall surface of the shell through a corrugated sealing rubber sleeve 5. The end of the corrugated sealing rubber sleeve 5 close to the adjusting knob extends out of the end of the shell assembly part and is arranged in the shell 7.

[0029] In an optional embodiment, the outer inner diameter of the inner wall of the shell that cooperates with the adjusting knob is smaller than the inner inner diameter. The adjusting knob is rotatably assembled in the large inner diameter area and installed through a rotational limiting structure. The shell rotates in the axial direction without axial movement, that is, it has rotational motion but no axial movement.

[0030] In an optional embodiment, a sealing gasket 10 is arranged between the inner end of the adjusting knob 11 and the small inner diameter area of ​​the housing 7 to prevent the gas or liquid inside the housing from being discharged through the gap between the adjusting knob and the housing.

[0031] In an optional embodiment, the nozzle 3 is provided with a rotatable switch knob 4 for controlling the opening / closing of the nozzle 3 to connect / disconnect with the outside, and the switch knob 4 can rotate around the axis direction of the nozzle. More preferably, an orifice is provided at an eccentric position on the end face of the switch knob 4, and when the switch knob rotates around the axis of the nozzle, the orifice can be connected / disconnected with the nozzle, thereby controlling the opening and closing of the nozzle 3 by rotation.

[0032] Optionally, the shell is a cylindrical shell with openings at both ends, the pressing head is a cylindrical shape matching the shell and closed at one end, and the nozzle is arranged on the peripheral side wall of the pressing head, and its axial direction is consistent with the radial direction of the pressing head.

[0033] In some embodiments, a rotating handle 12 is arranged on the side surface of the adjusting knob 11, and the rotating handle 12 is convex on the side surface of the adjusting knob to facilitate the rotation operation of the adjusting knob. When the rotating handle 12 is in a horizontal state, it is in an exhaust mode, and the second channel check valve 13 is connected to the battery injection / exhaust hole 9. When the rotating handle 12 is in a vertical state, it is in an injection mode, and the second channel check valve 14 is connected to the injection hole 8, and the second channel check valve 15 is connected to the battery injection / exhaust hole 9.

[0034] When in use, insert the battery filling / exhaust hole 9 of the device into the filling hole of the square battery, rotate the rotating handle 12 of the adjustment knob to the horizontal direction, open the switch knob 4 so that the hole on it is connected with the nozzle 3, as shown in FIG. Figure 1 As shown, the device is in exhaust mode. Figure 1 Taking the shown example, the pressing head 1 is pressed to the right, the elastic device 6 is compressed, the gas in the cavity 16 is compressed, the pressure increases, the first channel one-way valve 13 blocks the battery injection / exhaust hole 9, and the first one-way valve 2 is pushed open, and the gas in the cavity 16 is discharged; the pressing head 1 is released, the elastic device 6 drives the pressing head 1 to rebound, the pressure in the cavity 16 decreases, the first one-way valve 2 is sucked to close the nozzle 3, and the first channel one-way valve 13 is sucked up to open the battery injection / exhaust hole 9, and the gas in the battery is sucked into the cavity 16, and then the pressing head 1 is pressed cyclically until all the gas in the battery is discharged.

[0035] When all the gas in the battery is exhausted, the injection hole 8 is connected to the electrolyte storage tank, and the rotating handle 12 of the adjustment knob 11 is rotated 90° counterclockwise to a vertical state. After the electrolyte fills the cavity 16, the switch knob 4 is rotated 180° to close the nozzle 3. Figure 2 As shown, this is the injection mode. Pressing the pressing head 1 drives the elastic device 6 to compress, the electrolyte in the cavity 16 is compressed, and the second channel one-way valve 14 is lifted up to block the injection hole 8 to prevent the electrolyte from flowing back. At the same time, the third channel one-way valve 15 opens and connects with the battery injection / exhaust hole 9, and the electrolyte is injected into the battery. Release the pressing head 1, the elastic device 6 drives the pressing head 1 to rebound, the pressure in the cavity decreases, the second channel one-way valve 14 falls, the injection hole 8 opens, and the liquid in the electrolyte storage tank enters to replenish the electrolyte in the cavity 16. At the same time, the third channel one-way valve 15 is sucked, blocking the battery injection / exhaust hole 9 to prevent the electrolyte in the battery from flowing back. Then, the pressing head 1 is pressed cyclically to complete the injection of the battery electrolyte.

[0036] The device of the utility model allows exhaust and liquid injection to be performed in the same cavity, and the exhaust and liquid injection use the same access port, so that no other impurity gas and moisture will enter during the process of converting battery exhaust into liquid injection, thereby improving the liquid injection efficiency and ensuring the safety of the battery. At the same time, the device has a simple structure, is easy to operate, and has a low cost.

[0037] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be implemented in other specific forms without departing from the spirit or basic features of the utility model; therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is limited by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the utility model.

[0038] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A lithium battery exhaust and liquid injection device, characterized in that: The invention comprises a shell with openings at two opposite ends, a pressing head which is coaxially assembled in the shell by one end of the shell and can move back and forth along the axis direction of the shell, and an elastic device arranged in the pressing head for resetting the pressing head, wherein the pressing head has a nozzle with a first one-way valve arranged therein, and the shell is provided with a liquid injection hole and a battery liquid injection / exhaust hole connected to the battery liquid injection hole; an adjusting knob is assembled at the other end of the shell, and the adjusting knob has three channels, each of which is equipped with a second one-way valve, and when the adjusting knob is rotated to a predetermined position, one of the channels is connected to the liquid injection hole or the battery liquid injection / exhaust hole.

2. The lithium battery exhaust and liquid injection device according to claim 1, characterized in that: The first one-way valve and / or the second one-way valve adopts a ball, and the ball can rise and fall in the nozzle / channel along the axial direction of the nozzle / channel to realize opening / closing of the nozzle / channel.

3. The lithium battery exhaust and liquid injection device according to claim 1, characterized in that: The inner wall of the pressing head is provided with a limiting platform of an elastic device, one end of the elastic device is limited by the limiting platform, and the other end is limited by the inner side of the adjusting knob.

4. The lithium battery exhaust and liquid injection device according to claim 1, characterized in that: The outer diameter of the shell assembly part of the pressing head is smaller than the outer diameter of its main body, and the outer wall of the shell assembly part of the pressing head is connected to the inner wall surface of the shell through a corrugated sealing rubber sleeve, and one end of the corrugated sealing rubber sleeve close to the adjusting knob extends out of the end of the shell assembly part and is arranged in the shell.

5. The lithium battery exhaust and liquid injection device according to claim 1, characterized in that: The outer inner diameter of the inner wall of the adjusting knob matching portion of the housing is smaller than the inner inner diameter, and the adjusting knob is rotatably assembled in the large inner diameter area.

6. The lithium battery exhaust and liquid injection device according to claim 5, characterized in that: A sealing ring is arranged between the inner end of the adjusting knob and the small inner diameter area of ​​the housing.

7. The lithium battery exhaust and liquid injection device according to claim 1, characterized in that: The elastic device is a spring.

8. The lithium battery exhaust and liquid injection device according to claim 1, characterized in that: The nozzle is provided with a rotatable switch knob for controlling the nozzle to be opened / closed to connect / disconnect with the outside.

9. The lithium battery exhaust and liquid injection device according to claim 8, characterized in that: An orifice is arranged at an eccentric position on the end surface of the switch knob, and when the switch knob rotates around the axis of the nozzle, the orifice can be connected / disconnected with the nozzle.

10. The lithium battery exhaust and liquid injection device according to claim 1, characterized in that: A rotating handle is arranged on the end side of the adjusting knob.

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