CN210628408U

CN210628408U - Liquid injection device

Info

Publication number: CN210628408U
Application number: CN201921963275.XU
Authority: CN
Inventors: 王海涛; 刘卫强; 邓波; 罗勇
Original assignee: Shenzhen Pandpower Co Ltd
Current assignee: Shenzhen Pandpower Co Ltd
Priority date: 2019-11-14
Filing date: 2019-11-14
Publication date: 2020-05-26
Anticipated expiration: 2029-11-14

Abstract

The embodiment of the utility model discloses priming device, include: the lithium battery electrolyte filling device comprises a rack, a tapping mechanism and an electrolyte filling mechanism, wherein the tapping mechanism comprises a tapping assembly and a driving assembly, the tapping assembly is used for tapping on a lithium battery, and the driving assembly comprises a first driving assembly for driving the tapping assembly to move along a first linear direction, a second driving assembly for driving the tapping assembly to move along a second linear direction and a third driving assembly for driving the tapping assembly to move along a third linear direction; first linear direction and second linear direction are on the coplanar, and third linear direction is the contained angle setting with this plane, annotates liquid mechanism and includes annotating liquid subassembly and removal subassembly, makes the trompil subassembly under drive assembly's drive, can remove wantonly at the upper surface of lithium cell group, selects the optimal position to carry out the trompil, and the trompil is fast, of high quality, has promoted trompil efficiency and trompil quality, and then has promoted efficiency and the quality that the lithium cell was annotated.

Description

Liquid injection device

Technical Field

The utility model relates to a lithium cell annotates liquid technical field, especially relates to an injection device.

Background

Along with electric automobile's rapid development, the application of lithium cell is also along with high-speed development, and the long-term use of lithium cell, its performance and life-span can appear the decay, and the retired lithium cell market is also followed the explosive growth.

The liquid injection device is used as a liquid injection device. The working principle is as follows: utilize drilling mechanism to set up on the lithium cell and annotate the liquid hole to through annotating the liquid hole and to injecting into electrolyte in the lithium cell, in time seal after annotating the liquid and finishing.

To traditional priming device, because new lithium cell annotates the liquid hole and is reserved, so do not possess trompil mechanism, but the lithium cell module of retirement, original notes liquid hole has been sealed to through long-time use, have the surface expansion of different degrees, electric core height is not level in the module, and the pencil has on the electric core, it is limited to lead to the trompil space, can lead to priming device to appear the problem in the trompil link, can greatly influence and annotate liquid efficiency and finished product quality.

Disclosure of Invention

An object of the utility model is to provide an injection device aims at solving traditional injection device, annotates the lower problem of liquid efficiency and finished product quality to the lithium cell module.

A fluid injection apparatus comprising:

a frame;

the hole opening mechanism is arranged on the rack and comprises a hole opening assembly and a driving assembly, the hole opening assembly is used for opening a hole in the lithium battery, and the driving assembly comprises a first driving assembly for driving the hole opening assembly to move along a first linear direction, a second driving assembly for driving the hole opening assembly to move along a second linear direction and a third driving assembly for driving the hole opening assembly to move along a third linear direction; and

the liquid injection mechanism is arranged on the rack and comprises a liquid injection assembly and a moving assembly, the liquid injection assembly is used for injecting liquid into the lithium battery, and the moving assembly comprises a first moving assembly and a second moving assembly, the first moving assembly drives the liquid injection assembly to move along a first linear direction, and the second moving assembly drives the liquid injection assembly to move along a second linear direction;

the first straight line direction and the second straight line direction are on the same plane, and the third straight line direction and the plane are arranged at an included angle.

In one embodiment, the tapping assembly comprises a hole milling structure, a hole drilling structure and a distance measuring device, the third driving assembly comprises a hole milling driving part for driving the hole milling structure to move and a hole drilling driving part for driving the hole drilling structure to move, the measuring direction of the distance measuring device is along the third linear direction, and the distance measuring device is used for measuring the distance from the hole milling structure to the upper surface of the lithium battery and the distance from the hole drilling structure to the upper surface of the lithium battery.

In one embodiment, the hole milling structure comprises a milling cutter and a first power part for driving the milling cutter to rotate, the drilling structure comprises a drill and a second power part for driving the drill to drill, the milling cutter is used for milling the cover on the upper surface of the lithium battery to form the opening part, and the drill is used for drilling the opening part on the lithium battery to form the liquid injection hole.

In one embodiment, the liquid injection assembly comprises a vacuum pumping structure and an injection structure, wherein the vacuum pumping structure is used for pumping air in the lithium battery, and the injection structure is used for injecting electrolyte into the lithium battery after vacuum pumping.

In one embodiment, the lithium battery.

In one embodiment, the lithium battery charging device further comprises a charging positioning mechanism and a turnover workbench, wherein the charging positioning mechanism is arranged at the charging end of the rotary conveying mechanism, and the charging positioning mechanism is arranged at the upper part of the turnover workbench and used for fixing the lithium battery.

In one of them embodiment, still including being used for annotating the stock solution mechanism that liquid mechanism provided electrolyte, stock solution mechanism includes the liquid storage pot, locates the level sensor in the stock solution pot, solenoid valve and the control unit of being connected with outside fluid infusion system, level sensor is used for detecting the liquid level height in the stock solution pot to signal transmission gives the control unit, and the control unit is used for controlling the solenoid valve and opens, and fluid infusion system is to the fluid storage pot fluid infusion.

In one embodiment, the punching machine further comprises a waste chip suction device arranged below the punching mechanism, and the waste chip suction device is used for sucking waste chips generated after machining of the punching mechanism.

In one embodiment, the lithium battery further comprises a liquid supplementing mechanism arranged at the downstream of the liquid injecting mechanism, wherein the liquid supplementing mechanism is used for forming the closure of the liquid injecting hole of the lithium battery; the liquid supplementing mechanism comprises a position adjusting component, a shifting component and a liquid supplementing component, the position adjusting component is used for driving the liquid supplementing component to move in a first linear direction, a second linear direction and a third linear direction and is connected with the shifting component, and the shifting component is used for controlling the position adjusting component and the liquid supplementing component to move in an arc mode and is connected with the rack.

In one embodiment, the lithium battery electrolyte filling device further comprises a liquid supplementing mechanism arranged downstream of the electrolyte filling mechanism, and the liquid supplementing mechanism is used for forming the closure of the electrolyte filling hole of the lithium battery.

In one embodiment, the liquid replenishing mechanism includes a positioning component, a shifting component and a liquid replenishing component, the positioning component is used for driving the liquid replenishing component to move in the first linear direction, the second linear direction and the third linear direction and is connected with the shifting component, and the shifting component is used for controlling the positioning component and the liquid replenishing component to move in an arc shape and is connected with the rack.

Implement the embodiment of the utility model provides a, will have following beneficial effect:

after having adopted above-mentioned priming device, trompil mechanism includes trompil subassembly and drive assembly, the trompil subassembly is used for trompil on the lithium cell, drive assembly includes the first drive assembly that the drive trompil subassembly removed along first linear direction, the second drive assembly that the drive trompil subassembly removed along second linear direction and the third drive assembly that the drive trompil subassembly removed along third linear direction, first linear direction and second linear direction are on the coplanar, third linear direction is the contained angle setting with this plane, make the trompil subassembly under drive assembly's drive, can remove wantonly at the upper surface of lithium cell group, select the optimal position and carry out the trompil, the trompil is fast, high quality, trompil efficiency and trompil quality have been promoted, and then the efficiency and the quality of lithium cell notes liquid have been promoted. Therefore, the liquid injection regeneration of the lithium battery is realized, the performance of the lithium battery is improved, the service life of the lithium battery is prolonged, and the pollution of the retired lithium battery to the environment is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Wherein:

FIG. 1 is a schematic view of a priming device in one embodiment.

Fig. 2 is an enlarged view of the filling device shown in fig. 1 at a.

Fig. 3 is an enlarged view of the filling device shown in fig. 1 at B.

Fig. 4 is an enlarged view of the filling device shown in fig. 1 at C.

Fig. 5 is a front view of the injection device shown in fig. 1.

Fig. 6 is a top view of the injection device shown in fig. 1.

Figure 7 is a side view of the injection device shown in figure 1.

Fig. 8 is a schematic view of the hole opening mechanism and the liquid injection mechanism in the liquid injection device shown in fig. 1.

Fig. 9 is a schematic view of a frame and a rotary transport mechanism in the liquid injection device shown in fig. 1.

FIG. 10 is a schematic view of the operation of the liquid injection device in one embodiment.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1, 2, and 5 to 8, a liquid injection device according to an embodiment is mainly used for injecting an electrolyte into a lithium battery, and includes: the device comprises a frame 100, a hole opening mechanism 200 and a liquid injection mechanism 300; trompil mechanism 200 and annotate liquid mechanism 300 and locate in frame 100, trompil mechanism 200 includes trompil subassembly 210 and drive assembly 220, trompil subassembly 210 is used for trompil on the lithium cell, drive assembly 220 includes the first drive assembly 221 that drive trompil subassembly 210 removed along first linear direction, drive trompil subassembly 210 is along the second drive assembly 220 that second linear direction removed and the third drive assembly 223 that drive trompil subassembly 210 removed along third linear direction, first linear direction and second linear direction are on the coplanar, third linear direction is the contained angle setting with this plane, realize accurate completion trompil work of trompil subassembly 210 in appointed cubical space, form and annotate the liquid hole. Annotate liquid mechanism 300 including annotating liquid subassembly 310 and removal subassembly 320, annotate liquid subassembly 310 and be used for annotating liquid to the lithium cell internal liquid, removal subassembly 320 includes that the drive annotates the first removal subassembly 321 that liquid subassembly 310 removed along first rectilinear direction and the drive and annotates the second removal subassembly 322 that liquid subassembly 310 removed along second rectilinear direction, the realization is annotated accurate removal of liquid subassembly 310 and is annotated liquid hole position, accomplish and annotate liquid work, adopt trompil mechanism 200 to select the optimal position and carry out the trompil, it is fast to open the hole, high quality, trompil efficiency and trompil quality have been promoted, and then the efficiency and the quality of annotating liquid of lithium cell have been promoted, the notes liquid regeneration of lithium cell has been realized, the performance of lithium cell has been improved, the life of extension lithium cell, reduce the.

In this embodiment, the hole drilling assembly 210 includes a hole milling structure 211, a hole drilling structure 212 and a distance measuring device, the third driving assembly 223 includes a hole milling driving component 2231 for driving the hole milling structure 211 to move and a hole drilling driving component 2232 for driving the hole drilling structure 212 to move, distance measuring devices for measuring distances are disposed on the hole milling driving component 2231 and the hole drilling driving component 2232, and a measuring direction of the distance measuring devices is along a third linear direction, the distance measuring devices are used for measuring distances by the distance measuring devices, so as to control a moving distance of the hole drilling driving component 2232 and the hole drilling driving component 2232 in the third linear direction, and the distance measuring devices are used for measuring a distance from the hole milling structure 211 to an upper surface of the lithium battery and a distance from the hole drilling structure 212 to the upper surface of the lithium battery, thereby controlling a hole milling position depth of the hole milling structure 211 on the lithium battery, milling away a cover, but not, and obtaining the liquid injection hole meeting the depth standard.

Specifically, the range unit is displacement sensor, and the third rectilinear direction of displacement sensor range finding is vertical direction for measure the distance of milling cutter 2111 and drill bit 2121 and lithium cell upper surface, accomplish the control of milling cutter 2111 in vertical direction, guarantee to get rid of the rubber or the plastic of lithium cell upper surface, and do not destroy electric core inner structure, accomplish the control of drill bit 2121 in vertical direction, accomplish the drilling work of appointed degree of depth, form the standard and annotate the liquid hole. Preferably, the drilling position of the drill bit 2121 is the central position of the opening part to ensure the forming effect of the liquid injection hole. Measure the height of milling cutter 2111 and lithium cell group product through displacement sensor, and then the degree of depth of control milling rubber, let milling cutter 2111 just mill the rubber, and processing effect is good, and the electric core height is uneven in the lithium cell module, and displacement sensor measures the height, and the degree of depth of accurate control drilling obtains annotating the liquid hole.

In this embodiment, the hole milling structure 212 includes a milling cutter 2111 and a first power component 2112 for driving the milling cutter 2111 to rotate, the drilling structure 212 includes a drill 2121 and a second power component 2122 for driving the drill 2121 to drill a hole, the milling cutter 2111 is used for milling a cover on the upper surface of the lithium battery to form an opening portion, the cover refers to a rubber or plastic on the surface of the lithium battery, the purpose of the cover is to form a clean and flat opening portion on the upper surface of the lithium battery, which is convenient for subsequent drilling, and the drill 2121 is used for drilling the opening portion on the lithium battery to form a liquid injection hole. Preferably, the first power element 2112 and the second power element 2122 are servo motors for driving the milling cutter 2111 and the drill bit 2121 to rotate through power shafts.

In this embodiment, the hole opening mechanism 210 further includes a driving bottom plate 230, a driving transverse plate 240 and a driving vertical plate 250, the driving bottom plate 230 extends along a first linear direction and supports the driving transverse plate 240, the driving transverse plate 240 extends along a second linear direction and is slidably disposed on the driving bottom plate 230, the driving vertical plate 250 extends along a third linear direction and is slidably disposed on the driving transverse plate 240, a first driving assembly 221 is disposed on the driving bottom plate 230 and is connected to the driving transverse plate 240, a second driving assembly 222 is disposed on the driving transverse plate 240 and is connected to the driving vertical plate 250, a third driving assembly 223 and a hole opening assembly 210 are disposed on the driving vertical plate 250, the first driving assembly 221 and the second driving assembly 222 are used for driving the third driving assembly 223 and the hole opening assembly 210 to move in a horizontal plane, so as to realize the hole opening assembly 210, select a hole opening position in the horizontal direction quickly and efficiently to avoid a wiring harness on the lithium battery pack, improve the quality and efficiency of the hole opening.

In the present embodiment, the movement of the horizontal driving plate 240 in the first linear direction is an X-axis stroke, the movement of the vertical driving plate 250 in the second linear direction is a Y-axis stroke, and the stroke of the hole forming assembly 210 in the third linear direction is a Z-axis stroke, so as to form a complete coordinate system of a three-dimensional space, wherein the movement stroke of the horizontal driving plate 240 in the X-axis direction is 600mm to 800mm, the movement stroke of the vertical driving plate 250 in the Y-axis direction is 200mm to 500mm, the movement stroke of the hole milling structure 212 in the hole forming assembly 210 in the Z-axis direction is 150mm to 300mm, the movement stroke of the hole drilling structure 212 in the Z-axis direction is 150mm to 300mm, and the movement strokes of the hole milling structure 212 and the hole drilling structure 212 may be the same or different. Of course, in other embodiments, the moving stroke of the driving transverse plate 240, the driving vertical plate 250 and the hole-forming element 210 can be other options, and the purpose of the movement of the hole-forming element 210 in a designated hole-forming space is to ensure the hole-forming efficiency and quality.

Preferably, the movement stroke of the driving transverse plate 240 on the X axis is 350mm, the movement stroke of the driving vertical plate 250 on the Y axis is 740mm, the movement stroke of the hole milling structure 212 in the hole forming assembly 210 on the Z axis is 210mm, and the movement stroke of the hole drilling structure 212 on the Z axis is 210 mm.

Referring to fig. 3, the liquid injection mechanism 300 further includes a movable bottom plate 330, a movable transverse plate 340 and a movable vertical plate 350, the movable bottom plate 330 extends along a first linear direction and supports the movable transverse plate 340, the movable transverse plate 340 extends along a second linear direction and is slidably disposed on the movable bottom plate 330, the movable vertical plate 350 extends along a third linear direction and is slidably disposed on the movable transverse plate 340, a first movable component 321 is disposed on the movable bottom plate 330 and connected to the movable transverse plate 340, a second movable component 322 is disposed on the movable transverse plate 340 and connected to the movable vertical plate 350, the liquid injection component 310 is disposed on the movable vertical plate 350, the first movable component 321 and the second movable component 322 are used for driving the liquid injection component 310 to move in a horizontal plane, after the hole opening component 210 completes the hole opening, the liquid injection component 310 is driven by the first movable component 321 and the second movable component 322, the position of the liquid injection hole is opposite to the position of the liquid injection hole, and the liquid injection operation is completed by automatic adjustment.

In this embodiment, the liquid injection assembly 310 includes a vacuum pumping structure for pumping air in the lithium battery and an injection structure for injecting the electrolyte into the lithium battery after the vacuum pumping; the arrangement of the vacuumizing structure, negative pressure is formed in the battery through vacuumizing, so that the liquid discharging speed of the electrolyte of the lithium battery is increased, and the problem that the electrolyte is difficult to discharge due to the surface tension generated between the gaps of the diaphragm pole pieces is solved. After the liquid injection station is moved, the injection structure is tightly pressed with the lithium battery through the sealing ring, and liquid injection is realized.

Please refer to fig. 9 together, the liquid injection device further includes a rotary transportation mechanism 400 disposed below the hole opening mechanism 200 and the liquid injection mechanism 300, the rotary transportation mechanism 400 includes a roller assembly 410 and a power assembly 420 for driving the roller assembly 410 to rotate, the roller assembly 410 is used for carrying and rotatably transporting the lithium battery, so that the lithium battery can be rotatably transported by the rotary transportation mechanism 400, and the lithium battery is moved at the designated station, wherein the power assembly 420 can be a motor belt transmission mechanism or a motor gear transmission mechanism, and the purpose of the rotary transportation mechanism is to drive the roller assembly 410 to rotate and transport the lithium battery. Of course, in other embodiments, the roller assembly 410 may also be a conveyor belt or other conveying mechanism, which is intended to convey the lithium battery between the stations.

In this embodiment, priming device is still including locating the material loading positioning mechanism and the turnover workstation of slewing conveying mechanism 400 material loading end, and material loading positioning mechanism locates turnover workstation upper portion for fixed lithium cell realizes the material loading of lithium cell at the production water line, and is preferred, and the turnover workstation is bull's eye bearing turnover workstation.

In this embodiment, the liquid injection device further includes a scrap suction device located below the hole opening mechanism 200, and the scrap suction device is used for sucking the scrap generated after the hole opening mechanism is processed, so as to collect the scrap.

In this embodiment, be equipped with turnover layer board 401 on the gyration transport mechanism 400, turnover layer board 401 bears on roller components 410, can carry out rotary motion, is equipped with the positioner who lifts the subassembly and be used for fixed lithium cell on the turnover layer board 401, lifts the subassembly and is used for controlling the lift of lithium cell in vertical direction, lifts subassembly and positioner and annotates liquid subassembly 310 cooperation, realizes annotating the notes liquid work in liquid hole.

Referring to fig. 4, the liquid injection device further includes a liquid replenishing mechanism 500 disposed downstream of the liquid injection mechanism 300, the liquid replenishing mechanism 500 is used for sealing the liquid injection hole of the lithium battery; the liquid supplementing mechanism 500 comprises a position adjusting component 510, a shifting component 520 and a liquid supplementing component 530, wherein the position adjusting component 510 is used for driving the liquid supplementing component 530 to move in a first linear direction, a second linear direction and a third linear direction and is connected with the shifting component 520, the shifting component 520 is used for controlling the position adjusting component 510 and the liquid supplementing component 530 to move in an arc manner and is connected with the rack 100, and the liquid injecting mechanism is used for sealing a liquid injecting hole after liquid injection of the liquid injecting mechanism 300 to form a steel ball sealing form.

Specifically, the positioning assembly 510 includes a Y-axis moving mechanism, an X-axis moving mechanism, and a Z-axis moving mechanism, and completes the movement of the fluid infusion assembly 530 in the three-dimensional space, the moving assembly 520 is an independent adjustable automatic moving mechanism, and the fluid infusion assembly 530 cooperates with the fluid injection mechanism 300 to work.

In this embodiment, priming device is still including being used for providing stock solution mechanism 600 of electrolyte for annotating liquid mechanism 300, stock solution mechanism 600 includes the liquid storage pot, locate the level sensor in the liquid storage pot, solenoid valve and the control unit of being connected with outside fluid infusion system, level sensor is used for detecting the liquid level height in the liquid storage pot, and signal transmission gives control unit, control unit is used for controlling the solenoid valve and opens, outside fluid infusion system is to the fluid storage pot fluid infusion, guarantee to have sufficient electrolyte in the liquid storage pot and supply with liquid mechanism 300.

Specifically, the liquid storage tank is further provided with a pressure sensor and a ball valve, and the pressure sensor is used for detecting that the internal pressure of the liquid storage tank is within a safety range value. When the liquid level sensor measures the lowest liquid level signal, the control unit receives the sensor signal and automatically controls the liquid replenishing into the liquid storage tank, preferably, the liquid storage tank is a stainless steel electrolyte automatic liquid replenishing and storing tank, and the control unit is a PLC control system.

In this embodiment, the frame 100 includes a loading part, a main body part and a turnover table part, which are preferably 3m to 5m long, 1m to 2m wide and 1.5m to 3m high, and are sized to ensure the installation of functional components thereon and not interfere with the operation, and the frame 100 is painted with an exterior appearance and provided with a viewing window, which is formed of corrosion-resistant glass to avoid corrosion and prolong the service life. Preferably, the size of the rack 100 is 4m long, 1.5m wide and 1.9m high, the main body of the rack 100 is composed of a 50mm × 50mm × 3mm iron square tube and a 50mm × 100mm × 3mm flat tube, wherein the key structure is that the 50mm × 50mm × 3mm iron square tube and an iron plate with the thickness of 10mm are reinforced and fixed, and the platform bottom plate is an iron plate with the thickness of 1.5 mm. Of course, in other embodiments, the specific size of the frame 100 may be selected to carry and operate the functional components.

In this embodiment, the priming device still includes the glass dustcoat, supporting mechanism such as customization automatic rising fork truck and electric control system constitutes, adopt material loading positioning mechanism, the turnover workstation, material loading assembly line and gyration transport mechanism 400 send lithium cell or lithium cell module to the hole milling station, the rubber on lithium cell surface is milled to the hole milling structure is useless to be cut, and be inhaled the sweeps device and collect, this moment, PLC control system has recorded the coordinate position of milling the rubber, electric control system is control complete machine operating system, can set up each system parameter through the touch-sensitive screen, come regeneration to annotate to the module and annotate liquid, it breaks into electric core to have reduced the module, it assembles the module again after annotating the liquid, degree of automation is high, the location is accurate, high production efficiency, greatly prolong the life of battery.

As shown in fig. 10, the electrolyte injection device according to an embodiment is mainly used for injecting electrolyte into a lithium battery during operation, and includes the following steps:

s100, moving the lithium battery to a first station corresponding to the hole opening mechanism 200 by adopting a rotary conveying mechanism 400.

And S200, milling the upper surface cover of the lithium battery by using the hole opening mechanism 200 to form a hole opening part, and drilling a liquid injection hole with a specified depth in the hole opening part.

S300, moving the lithium battery to a second station corresponding to the liquid injection mechanism 300 by adopting the rotary conveying mechanism 400.

S400, the liquid injection mechanism 300 extracts air in the lithium battery and injects electrolyte into the lithium battery.

S500, moving the lithium battery to a third station corresponding to the liquid supplementing mechanism 500.

S600, the liquid supplementing mechanism 500 forms the sealing of the lithium battery liquid injection hole.

Adopt the priming device of this embodiment, drive assembly 220 can drive trompil subassembly 210 mills out the rubber and trompil in the optional position of lithium cell upper surface, and the trompil is efficient, and is of high quality, has realized annotating liquid regeneration of lithium cell, has improved the performance of lithium cell, prolongs the life of lithium cell, reduces the pollution of retired lithium cell to the environment.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, which is defined by the appended claims.

Claims

1. A priming device, comprising:

a frame;

the liquid injection mechanism is arranged on the rack and comprises a liquid injection assembly and a moving assembly, the liquid injection assembly is used for injecting liquid into a lithium battery, and the moving assembly comprises a first moving assembly and a second moving assembly, the first moving assembly drives the liquid injection assembly to move along the first linear direction, and the second moving assembly drives the liquid injection assembly to move along the second linear direction;

2. The liquid injection device according to claim 1, wherein the hole forming assembly comprises a hole milling structure, a hole drilling structure and a distance measuring device, the third driving assembly comprises a hole milling driving part for driving the hole milling structure to move and a hole drilling driving part for driving the hole drilling structure to move, the measuring direction of the distance measuring device is along the third linear direction, and the distance measuring device is used for measuring the distance from the hole milling structure to the upper surface of the lithium battery and the distance from the hole drilling structure to the upper surface of the lithium battery.

3. The electrolyte injection device according to claim 2, wherein the hole milling structure comprises a milling cutter and a first power member for driving the milling cutter to rotate, the drilling structure comprises a drill and a second power member for driving the drill to drill, the milling cutter is used for milling the envelope on the upper surface of the lithium battery to form the opening part, and the drill is used for drilling the opening part on the lithium battery to form the electrolyte injection hole.

4. The electrolyte injection device according to claim 1, wherein the electrolyte injection assembly comprises a vacuum-pumping structure and an injection structure, the vacuum-pumping structure is used for pumping air in the lithium battery, and the injection structure is used for injecting electrolyte into the lithium battery after vacuum pumping.

5. The liquid injection device according to claim 1, further comprising a rotary transportation mechanism disposed below the hole opening mechanism and the liquid injection mechanism, wherein the rotary transportation mechanism comprises a roller assembly and a power assembly for driving the roller assembly to rotate, and the roller assembly is used for carrying and rotationally transporting the lithium battery.

6. The liquid injection device according to claim 5, further comprising a feeding positioning mechanism and a turnover worktable, wherein the feeding positioning mechanism and the turnover worktable are arranged at a feeding end of the rotary transportation mechanism, and the feeding positioning mechanism is arranged at the upper part of the turnover worktable and used for fixing the lithium battery.

7. The liquid injection device according to claim 1, further comprising a liquid storage mechanism for providing electrolyte for the liquid injection mechanism, wherein the liquid storage mechanism comprises a liquid storage tank, a liquid level sensor arranged in the liquid storage tank, an electromagnetic valve connected with an external liquid supplementing system, and a control unit, the liquid level sensor is used for detecting a liquid level height in the liquid storage tank and transmitting a signal to the control unit, the control unit is used for controlling the electromagnetic valve to be opened, and the liquid supplementing system supplements liquid to the liquid storage tank.

8. The liquid injection device according to claim 1, further comprising a scrap suction device disposed below the hole opening mechanism, wherein the scrap suction device is configured to suck scrap generated after processing by the hole opening mechanism.

9. The liquid injection device according to claim 1, further comprising a liquid replenishing mechanism disposed downstream of the liquid injection mechanism, wherein the liquid replenishing mechanism is used for closing the liquid injection hole of the lithium battery.

10. The liquid injection device according to claim 9, wherein the liquid replenishing mechanism includes a positioning component, a shifting component and a liquid replenishing component, the positioning component is configured to drive the liquid replenishing component to move in the first linear direction, the second linear direction and the third linear direction and is connected to the shifting component, and the shifting component is configured to control the positioning component and the liquid replenishing component to move in an arc shape and is connected to the frame.