CN218975752U - Battery liquid filling machine - Google Patents

Abstract

The utility model provides a battery liquid injection machine which comprises a sealing mechanism, a liquid injection mechanism and a battery bearing device. The battery is arranged in the sealed cavity; and the liquid injection nozzle is connected with the cavity in a sealing way to inject liquid into the battery for N times, and negative pressure and normal pressure and/or positive pressure are alternately applied in the cavity during the liquid injection for the times. Firstly, vacuumizing a sealed space through vacuumizing equipment, discharging air in the sealed space including a battery, then injecting quantitative electrolyte into the battery by matching with a liquid injection nozzle, then recovering the air pressure in the sealed space to be the ambient air pressure, injecting the quantitative electrolyte into the battery again, then vacuumizing again to discharge air, injecting the quantitative electrolyte for the last time, finally inflating and pressurizing the sealed space, keeping the pressure at a certain level, and discharging bubbles in the battery. The method of repeated vacuumizing and pressurizing is adopted, so that efficient liquid injection and effective air bubble discharge are realized, and the impregnation efficiency of the electrolyte is accelerated.

Description

Battery liquid filling machine

Technical Field

The utility model relates to the technical field of battery product production, in particular to a battery liquid injection machine.

Background

Along with the rapid development of new energy battery industry, the requirement of the battery is larger and larger, the production efficiency of the battery needs to be improved urgently, in the prior art, electrolyte is generally injected into the battery once after one-time vacuumizing, redundant electrolyte is extracted once again, and finally the liquid injection work is finished, and the liquid injection mode often cannot completely remove residual bubbles in the battery cell, in particular to bubbles at dead angle parts of the battery cell. The residual bubbles can seriously affect the quality of the battery cell and the safety of the subsequent procedures. To overcome this problem, CN105406021B discloses a liquid injection device and a liquid injection method, which comprises a liquid injection cup cavity, an upper fixing plate, a lower fixing plate, a liquid injection nozzle, a liquid injection port, a first blocking rod, a second blocking rod, a first driving component and a second driving component, wherein the upper end face and the lower end face of the liquid injection cup cavity are respectively in close contact with the upper fixing plate and the lower fixing plate, the liquid injection port is arranged on the upper fixing plate and communicated with the liquid injection cup cavity, the liquid injection nozzle is positioned below the lower fixing plate and communicated with the liquid injection cup cavity, a through hole communicated with the liquid injection cup cavity is arranged on the upper fixing plate, and the end of the through hole is connected with a gas nozzle. The utility model improves the liquid injection device of the existing lithium ion battery in terms of liquid injection principle, and changes the existing single liquid injection into reciprocating type small-amplitude repeated liquid injection so as to remove residual bubbles in dead angles inside the battery cell, thereby greatly improving the qualification rate of the battery cell liquid injection process and improving the battery cell quality of the liquid injection process on the premise of not affecting the overall productivity. However, the stable removal of bubbles still cannot be ensured by the method, and in addition, the improvement of the product quality is at the expense of production efficiency.

Disclosure of Invention

In order to solve the technical problems, the utility model provides a battery liquid injection machine, which is used for improving the quality and the production efficiency.

The normal pressure in this context is the atmospheric pressure of the apparatus and the environment in which the battery filling method is carried out, and is determined by its altitude.

Specifically, the utility model provides a battery liquid injection machine, which comprises:

the sealing mechanism comprises a sealing cover with a sealing cavity, wherein the sealing cover is provided with an air connector for pumping negative pressure and pressurizing, and the air connector is communicated with an air pressure adjusting device;

the liquid injection mechanism comprises a liquid injection nozzle, a liquid injection rod and a liquid injection rod driving mechanism, and the liquid injection nozzle is connected with the sealing cover in a sealing manner and is positioned in the sealing cover;

and the battery bearing device is used for bearing the battery and is in sealing fit with the sealing cover.

The battery liquid injection machine is used for matching and implementing the battery liquid injection method, so that the battery is in a sealed space during liquid injection, and the liquid injection nozzle is positioned in the sealed space, thereby being convenient for implementing liquid injection on the battery under different air pressure environments.

Further, the liquid injection nozzle mechanism further comprises a liquid storage cavity, the liquid injection nozzle is communicated with the liquid storage cavity, and the liquid injection rod is connected to the liquid storage cavity in a sliding mode;

the liquid storage cavity is provided with a liquid supplementing hole, when the liquid injection rod is positioned at the initial position before liquid injection, the liquid supplementing hole is communicated with the liquid storage cavity, and when the liquid injection rod slides to inject liquid, the liquid supplementing hole is not communicated with the liquid storage cavity.

Further, the lower end of the liquid injection rod is provided with a sealing part which is in sealing fit with the liquid storage cavity, when the liquid injection rod is positioned at the initial position before liquid injection, the liquid supplementing hole is positioned at one side of the sealing part, and when the liquid injection rod slides to inject liquid, the liquid supplementing hole is positioned at the other side of the sealing part.

Further, the liquid storage cavity is internally provided with a step protruding along the sliding direction of the liquid injection rod, the end part of the liquid injection rod is provided with a blind hole capable of accommodating the step, the step is provided with a penetrating hole, one end of the hole is positioned at the front end of the liquid injection nozzle in the sealing cover to form a liquid injection port, and the other end of the hole penetrates through the upper end of the step.

The design of step is in order to prevent that electrolyte from flowing out, and the intracavity space that is not higher than the step upper end in the stock solution chamber is stock solution space, when annotating the liquid pole and move down, and blind hole part gets into the space between step and the stock solution intracavity wall (i.e. stock solution space), and electrolyte liquid level rises, and the step upper end is crossed, and the hole that runs through is annotated in the battery by annotating the liquid mouth of liquid mouth.

Further, a sealing structure or a sealing component is arranged at the bottom of the blind hole and is used for sealing the upper port of the step when the liquid injection rod descends to the sealing position.

Furthermore, a notch which is beneficial to the outflow of residual electrolyte is arranged at the lower port of the liquid injection nozzle.

Further, the battery bearing device comprises a battery positioning bearing tray for placing a battery, a lifting plate and a lifting plate lifting device, wherein the battery positioning bearing tray is arranged on the lifting plate, and the lifting plate is driven by the lifting plate lifting device to lift and then forms the sealing cavity together with the sealing cover.

The air pressure adjusting device can control the air pressure in the sealing cover to switch between negative pressure, ambient atmospheric pressure and positive pressure, and is matched with the liquid injection mechanism and the liquid injection nozzle to complete liquid injection and discharge bubbles, and a method of repeated vacuumizing and pressurizing can be adopted, so that the bubbles are effectively discharged while the efficient liquid injection is realized, the impregnation efficiency of the electrolyte is improved, and the problems in the prior art are solved.

Further, the liquid supplementing hole is communicated with an external electrolyte liquid adding bin, the liquid injecting rod can be arranged in the liquid storage cavity in a vertically moving mode, when the liquid injecting rod is located at the uppermost initial position, the liquid supplementing hole is communicated, quantitative electrolyte is injected into the liquid storage cavity by the external electrolyte liquid adding bin, and when the liquid injecting rod moves downwards to the position 1, the liquid supplementing hole is closed (closed by a sealing ring on the liquid injecting rod or closed by an electric control valve and the like). And the quantitative electrolyte is firstly injected into the liquid storage cavity every time, so that the accurate capacity of the electrolyte injected into the battery every time is ensured, and the problem that the electrolyte needs to be extracted again due to excessive injection in the prior art is avoided.

Furthermore, the lower end of the liquid injection rod is provided with a sealing ring, and the sealing ring is in sealing fit with the liquid storage cavity. The sealing ring is arranged on the liquid injection rod, the liquid injection rod is utilized to move downwards, and meanwhile, the liquid supplementing hole is closed, so that the structure is simple and ingenious.

Further, the battery liquid filling machine further comprises a manipulator for placing and taking out the battery on and from the battery bearing device.

Further, the battery liquid filling machine further comprises an electronic scale for weighing the battery.

Further, the battery liquid filling machine further comprises a feeding runner for conveying the battery to be filled with liquid and/or a discharging runner for conveying the battery after filling the liquid.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings used in the description of the embodiments or the prior art will be briefly described below.

FIG. 1 is a schematic view of the overall structure of a battery liquid injector according to the present utility model;

FIG. 2 is a schematic view of the structure of the liquid injection device of the present utility model;

FIG. 3 is a cross-sectional view of a battery efficient liquid injection mechanism A-A according to the present utility model;

FIG. 4 is a schematic view of the liquid injection bar of the present utility model in position 1;

FIG. 5 is a schematic view of the liquid injection rod of the present utility model at position 2;

FIG. 6 is a schematic view of the liquid injection bar of the present utility model at position 3;

FIG. 7 is a schematic view of the liquid injection bar of the present utility model at position 4;

FIG. 8 is a left side view of an embodiment of a battery injector of the present utility model;

fig. 9 is a top view of an embodiment of a battery injector of the present utility model.

In the drawings, the names corresponding to the reference numerals are:

a frame 1; an air joint 21; a liquid storage chamber 31; a fluid replacement hole 32; a liquid filling nozzle 33; notch 34; a hollow cylinder 35; a seal cap 41; a sealing rubber ring 42; a battery positioning and carrying tray 51; a jacking plate 52; a lifting plate lifting device 53; jacking cylinder 54; a battery 6; a trapezoidal screw 71; a screw holder 72; a coupling 73; a servo motor 74; a lifting nut 75; a liquid injection rod mount 76; a liquid injection rod 81; a blind hole 82; a seal ring 83; a gasket 84; a spring 85; a linear slide 9; a robot arm 101; an electronic scale 102; a feeding mechanism 103; and a blanking mechanism 104.

Detailed Description

The utility model is described in further detail below with reference to the accompanying drawings.

As shown in fig. 1, the present utility model provides a battery liquid injector for rapidly injecting an electrolyte into a battery 6, comprising a manipulator 101; an electronic scale 102; a feeding mechanism 103; discharging mechanism 104 and priming device 105:

the priming device is shown in fig. 2 to 7, and comprises a frame 1 for installing all parts and functional modules;

the air pressure adjusting device comprises an air joint 21 connected with the external negative pressure device and the pressurizing device, and a pipeline with one end connected with the air joint 21 and the other end communicated with the sealing cover 41;

a sealing mechanism including a sealing cap 41 for covering the battery 6 and placing it in the sealed space; a ring of sealing rubber ring 42 is generally provided at the lower opening of the sealing cap 41 to ensure sealing effect.

The liquid injection mechanism comprises a liquid injection rod 81 and a liquid injection rod driving mechanism; the example of fig. 1 includes 5 liquid storage cavities 31 and 5 matched liquid injection rods 81, and electrolyte can be simultaneously injected into 5 batteries 6 or 1 battery from 5 liquid injection holes. The liquid injection rod driving mechanism of fig. 1 adopts a servo motor 74 which is arranged on a frame 1 and drives a trapezoidal screw 71 to rotate through a coupler 73, the trapezoidal screw is arranged on the frame 1 through a screw fixing seat 72, a lifting nut 75 which is in threaded connection with the trapezoidal screw 71, a liquid injection rod mounting seat 76 which is fixedly connected with the lifting nut 75, and the liquid injection rod mounting seat 76 is simultaneously in sliding fit and arranged on a linear slide rail 9. The upper end of the pouring lever 81 is mounted on the pouring lever mounting seat 76. The servo motor 74 rotates in the forward and reverse directions to drive the lifting nut 75, the filling rod mounting seat 76 and the filling rod 81 to move up and down. In the example of fig. 1, the upper ends of the liquid injection rods 81 are slidably mounted in the liquid injection rod mounting seat 76, and springs 85 are provided therebetween, and the springs 85 function to prevent hard collision with the bottom and top of the liquid storage chamber 31 when the liquid injection rods 81 descend and ascend to the lowest position and the highest position, and the elastic pressure is also beneficial to sealing the upper port of the step (the step is processed into the hollow cylinder 35 in the example of fig. 3) of the liquid injection nozzle in the liquid storage chamber 31 by the sealing gasket 84 when the liquid injection rod descends to the lowest end.

The battery bearing device is used for bearing the battery and is in sealing fit with the sealing cover.

The air pressure adjusting device can control the air pressure in the sealed space formed by the sealed cover and the battery bearing device to switch between negative pressure, ambient atmospheric pressure and positive pressure, and the liquid injection mechanism is matched to complete liquid injection and bubble discharge, so that the method of repeated vacuumizing and pressurization can be adopted, the efficient liquid injection is realized, the bubbles are effectively discharged, the impregnation efficiency of the electrolyte is improved, and the problem in the prior art is solved.

As shown in fig. 1 and 3, a predetermined amount of electrolyte is injected into a reservoir 31 before the start of the injection, and after the start of the injection, all the electrolyte in the reservoir 31 is injected into the battery 6 in several steps. Each time the electrolyte is injected into the liquid storage cavity 31, the electrolyte injected into the battery 6 is ensured to have accurate capacity, and the problem that the electrolyte is required to be extracted again due to excessive injection in the prior art is avoided.

In the illustrated example, the liquid filling mechanism includes a liquid storage cavity 31, the liquid storage cavity 31 is provided with a liquid filling hole 32 communicated with an external electrolyte liquid filling bin, a liquid filling rod 81 capable of moving up and down is sleeved in the liquid storage cavity 31, the liquid filling rod 81 and the liquid storage cavity 31 are combined to be similar to a piston type injector, when the liquid filling rod is located at the uppermost initial position, the liquid filling hole 32 is conducted, at this time, a fixed amount of electrolyte can be filled into the liquid storage cavity 31 by the external electrolyte liquid filling device, after the liquid filling rod 81 moves down to the position 1, as shown in fig. 4 to 7, the liquid filling hole is closed (the closing refers to, for example, sealing rings 83 mounted on the liquid filling rod 81 in the example of fig. 3 or an electronic control valve is arranged on a pipeline between the liquid filling hole and the external bin to enable the liquid filling hole to be not conducted with the liquid storage cavity). Before starting to add liquid, the liquid supplementing hole is closed, so that the consistency of the injection quantity of each battery can be ensured.

In some embodiments, a sealing ring 83 is disposed at the lower end of the liquid injection rod 81, and the sealing ring 83 is in sealing fit with the liquid storage cavity 31. Through setting up sealing washer 83 on annotating the liquid pole 81, utilize annotating liquid pole 81 to move down and seal the fluid infusion hole 32 simultaneously, simple structure is ingenious. It is of course also possible to use an electronic valve to close the fluid-filling hole 32 in a coordinated manner, ensuring that the volume of electrolyte in the reservoir 31 is constant when starting to fill the battery with electrolyte, and ensuring that the electrolyte filling the battery 6 is quantitative.

In the example of fig. 1-6, the liquid injection nozzle 33 that is communicated with the liquid storage cavity 31 is disposed below the outer portion of the liquid storage cavity 31, a step is extended upwards in the liquid storage cavity 31 by the liquid injection nozzle 33, the hollow cylinder 35 is illustrated in the example of the drawing, a blind hole 82 is formed at the lower end of the liquid injection rod 81, the diameter of the blind hole 82 is larger than that of the hollow cylinder 35, when the liquid injection rod 81 descends to the position 1, as shown in fig. 4, the port of the blind hole 82 is flush with the upper end of the hollow cylinder 35, and when the position is at or below the position 1, as shown in the position 2 shown in fig. 5, the position 3 shown in fig. 6 and the position 4 (i.e. the closed position) shown in fig. 7, the hollow cylinder 35 is partially or completely sleeved in the blind hole 82. The hollow cylinder 35 is provided to prevent uncontrolled flow of electrolyte in the reservoir 31 into the cell.

In the illustrated example, the bottom of the blind hole 82 is provided with a sealing member, in the example shown as a gasket 84, typically made of rubber, for closing the upper port of the hollow cylinder 35 when the injection rod 81 is lowered to the position 4 (i.e. closed position). This prevents electrolyte from flowing back into the reservoir 31 during pressurization.

In a preferred embodiment, the lower port of the nozzle 33 is provided with a notch 34 for facilitating the outflow of the residual electrolyte.

In order to simplify the structure and facilitate taking the discharge cell, in the illustrated example, a scheme that the sealing cover 41 is fixed is adopted, but a mode that a battery bearing device ascends is adopted, wherein the battery bearing device comprises a battery positioning bearing tray 51 for placing the battery 6, a lifting plate 52 and a lifting plate lifting device 53, the battery positioning bearing tray 51 is arranged on the lifting plate 52, the lifting plate 52 is arranged on the lifting plate lifting device 53, and the lifting plate 52 is driven by the lifting plate lifting device 53 to ascend and then forms a sealing space together with the sealing cover 41. The jacking plate elevator 53 typically employs a power drive including a jacking cylinder 54.

The working principle of the example of fig. 1-6 is as follows:

the action flow and control method are as follows:

1. placing the battery 6 into a battery positioning carrier;

2. starting a jacking cylinder 54, jacking up, 52 to the sealing cover 41 and compacting, and forming a seal through a sealing rubber ring 42 on the sealing cover 41;

3. a fixed amount of electrolyte is injected into the liquid storage cavity 31 through the liquid supplementing hole 32 on the liquid storage cavity 31;

4. the servo motor 74 drives the liquid injection rod 81 to move downwards to the position 1 through the trapezoidal screw rod 71, and the liquid supplementing hole 32 is blocked by the sealing ring 83 on the liquid injection rod 81;

5. vacuumizing through the air connector 21, discharging air in the battery 6, the sealing cover 41 and the liquid storage cavity 31 and keeping the air in a certain negative pressure environment;

6. the servo motor 74 drives the liquid injection rod 81 to move downwards to the position 2, and part of electrolyte enters the liquid injection nozzle 33 at the inner diameter of the hollow cylinder 35 to be injected into the battery 6 through a gap between the blind hole 82 of the liquid injection rod 81 and the hollow cylinder 35 under the negative pressure environment;

7. closing the vacuumizing system, and allowing air to enter the sealing cover 41 through the air connector 21 so as to enable the sealing cover 41 to be in an atmospheric pressure environment;

8. the servo motor 74 drives the liquid injection rod 81 to move downwards to the position 3, and part of electrolyte is injected into the battery 6;

9. the air in the battery 6, the sealing cover 41 and the liquid storage cavity 31 is discharged through the air connector 21 and is kept in a certain negative pressure environment, and the negative pressure value is smaller than that of the first time;

10. the servo motor 74 drives the liquid injection rod 81 to move downwards to a position 4 (namely a closed position), residual electrolyte is injected into the battery 6 under the negative pressure environment, and a rubber check ring sealing gasket 84 on the liquid injection rod 81 blocks the upper port of the hollow cylinder 35;

11. the gas connector 21 inflates and pressurizes the sealing cover 41 and keeps the pressure constant, so that bubbles in the battery 6 are discharged, and the impregnation efficiency of the electrolyte is improved.

12. After the air pressure reaches the set value, the pressurizing and discharging of the pressure air are stopped, the pressure in the sealed cover is restored to the atmospheric pressure environment, the liquid injection is completed, the servo motor 74 drives the liquid injection rod 81 to reset, the lifting air cylinder 54 is lifted down, and the battery 6 is taken out.

In some embodiments, as shown in fig. 7-9, a manipulator 101 for placing and removing the battery on and from the battery carrier is added to the aforementioned battery injector (the part in the drawing dotted line box). The battery is transferred to the battery bearing device from the feeding mechanism 103 by using the manipulator 101 to finish liquid injection, and then the finished liquid injection battery is transferred to the discharging mechanism 104, so that the working efficiency is greatly improved. The feeding mechanism 103 may be a continuously running conveyor belt or the like, or may be a battery compartment or a case for transferring batteries. The discharging mechanism 104 may be a continuously running conveyor belt, or may be a battery compartment or box for transferring batteries.

In a preferred embodiment, the battery injector further comprises an electronic scale 102 for weighing the battery. The manipulator 101 clamps the battery after the liquid injection, moves to the electronic scale 102 for weighing, fully detects whether the liquid injection amount reaches the standard, and then transfers the battery to different blanking mechanisms for sorting according to whether the battery is qualified.

In practical application, the battery liquid injector further comprises a feeding runner for conveying the battery to be injected and/or a discharging runner for conveying the battery after the liquid injection is completed. The feeding runner can select a continuous running conveyor belt, and the discharging runner can be provided with two conveyor belts, one conveying qualified batteries and the other conveying unqualified batteries.

Taking 18650 battery liquid injection method as an example for illustration, the method specifically comprises the following steps:

s1, placing a battery into a battery positioning carrier; the battery positioning carrier can be a flat plate or a tray, or can be a device with XY axis or multiaxial coordinate adjusting function, one or more batteries can be fixed on the device, and the battery positioning carrier has the function of stably placing the batteries and enabling the liquid injection holes of the batteries to be aligned with the liquid injection nozzles.

S2, starting a sealing mechanism, covering the battery and placing the battery in a sealing space; the sealing mechanism may be a box with a sealing door or a sealing cover with a downward opening (as shown in the example of fig. 1).

S3, vacuumizing a sealed space (in the example of FIG. 1, the sealed space is formed by surrounding a sealed cover and a lifting plate for bearing a battery positioning carrier), discharging air in the sealed space and keeping the air in a certain negative pressure environment, wherein in the example of FIG. 1, the air in the battery and the sealed cover is discharged;

in this embodiment, the negative pressure may be selected as: 92Kpa, it being understood that this data is different for different specifications of batteries, whereas the specific data determines most experimental empirical values, and is therefore only listed here separately for a certain product.

S4, driving the liquid injection rod to move downwards to a position 2 by the servo motor, and injecting part of electrolyte into the battery through a gap between the liquid injection rod and the liquid injection nozzle (shown in fig. 4);

s5, closing the vacuumizing system, and enabling air to enter the sealed space through the air connector to enable the sealed space to be in an atmospheric pressure environment;

s6, the liquid injection rod moves downwards to a position 3 (shown in fig. 5), and part of electrolyte is injected into the battery;

s7, vacuumizing again, exhausting the internal air of the sealed space including the battery and keeping the internal air in a certain negative pressure environment, wherein the negative pressure value is smaller than that of the first time, for example, the negative pressure value of the step in the embodiment is as follows: -70KPa;

s8, driving the liquid injection rod to move downwards to a position 4 (namely a closed position, as shown in fig. 7) by a servo motor, injecting electrolyte into the battery under a negative pressure environment, and then closing a liquid injection hole on the liquid injection rod of the liquid injection nozzle;

s9, inflating and pressurizing the sealed space and keeping the pressure in a certain state, discharging bubbles in the battery, and accelerating the impregnation efficiency of the electrolyte, wherein in the embodiment, the positive pressure value of the step is as follows: the pressure of 0.7-0.9 Mpa, the intermediate value of 0.8 is generally taken during setting, and the intermediate value is generally between 0.7 and 0.9 under the 18650 battery specification according to the result adjustment;

and S10, stopping pressurizing, recovering the pressure in the sealed space to the atmospheric pressure environment, completing liquid injection, resetting the liquid injection rod, releasing the sealed state, and taking out the battery.

Firstly, vacuumizing a sealed space through vacuumizing equipment, discharging air in the sealed space including a battery, then injecting quantitative electrolyte into the battery, recovering the air pressure in the sealed space to be the ambient air pressure, injecting quantitative electrolyte into the battery again, then vacuumizing again to discharge air, injecting quantitative electrolyte for the last time, finally inflating and pressurizing the sealed space, keeping the pressure in a certain state, discharging bubbles in the battery, and accelerating the impregnation efficiency of the electrolyte. The utility model has the advantages that the method of repeated vacuumizing and pressurizing is adopted, so that the bubbles are effectively discharged while the efficient liquid injection is realized, the impregnation efficiency of the electrolyte is improved, and the difficult problem in the prior art is solved.

It should be noted that, in the embodiment, the liquid injection process is described by taking 18650 as an example, when the product is a battery with other specifications, besides the above pressure data being different, the cycle times of the normal pressure and the negative pressure may also be different, which may also be simply understood that the volume of the battery is related to the cycle times;

and under the condition of products with certain specifications, the injection step under positive pressure is also added, and the parameters are simply adjusted under the core method of the utility model and are all within the protection scope of the utility model.

It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit of the utility model.

Claims (8)

1. A battery fluid injector, comprising:

the sealing mechanism comprises a sealing cover with a sealing cavity, wherein the sealing cover is provided with an air connector for pumping negative pressure and pressurizing, and the air connector is communicated with an air pressure adjusting device;

the liquid injection mechanism comprises a liquid injection nozzle, a liquid injection rod and a liquid injection rod driving mechanism, and the liquid injection nozzle is connected with the sealing cover in a sealing manner and is positioned in the sealing cover;

the battery bearing device is used for bearing a battery and is in sealing fit with the sealing cover;

a manipulator for placing and taking out the battery on and from the battery carrying device;

the feeding runner is used for conveying the battery to be injected with the liquid; and/or a blanking runner for conveying the battery with the injected liquid.

2. The battery injector of claim 1, wherein the injector mechanism further comprises a liquid storage cavity, the liquid injection nozzle is communicated with the liquid storage cavity, and the liquid injection rod is slidingly connected to the liquid storage cavity;

the liquid storage cavity is provided with a liquid supplementing hole, when the liquid injection rod is positioned at the initial position before liquid injection, the liquid supplementing hole is communicated with the liquid storage cavity, and when the liquid injection rod slides to inject liquid, the liquid supplementing hole is not communicated with the liquid storage cavity.

3. The battery liquid filling machine according to claim 2, wherein a sealing part which is matched with the liquid storage cavity in a sealing way is arranged at the lower end of the liquid filling rod, the liquid filling hole is arranged on one side of the sealing part when the liquid filling rod is positioned at an initial position before liquid filling, and the liquid filling hole is arranged on the other side of the sealing part when the liquid filling rod slides to fill liquid.

4. The battery liquid filling machine according to claim 2, wherein the liquid storage cavity is internally provided with a step protruding along the sliding direction of the liquid filling rod, the end part of the liquid filling rod is provided with a blind hole capable of accommodating the step, the step is provided with a penetrating hole, one end of the hole is positioned at the front end of the liquid filling nozzle in the sealing cover to form a liquid filling opening, and the other end of the hole penetrates through the upper end of the step.

5. The battery injector of claim 4, wherein the bottom of the blind hole is provided with a sealing structure or sealing member for closing the upper step port when the injector rod is lowered to the closed position.

6. The battery injector of any one of claims 1-5, wherein the lower port of the nozzle is provided with a notch for facilitating the outflow of residual electrolyte.

7. The battery liquid injector according to any one of claims 1 to 5, wherein the battery carrying device comprises a battery positioning carrying tray for placing a battery, a lifting plate and a lifting plate lifting device, the battery positioning carrying tray is arranged on the lifting plate, and the lifting plate is driven by the lifting plate lifting device to lift and then forms the sealing cavity together with the sealing cover.

8. The battery injector of claim 1, further comprising an electronic scale for weighing the battery.

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