A lithium battery liquid injection mechanism

Abstract

The application discloses a kind of lithium battery liquid injection mechanism, comprising: liquid injection needle assembly, including shift component one and multiple liquid injection needles, liquid injection needle assembly is set on the cavity cover plate of liquid injection cavity;Shift component one is used to move the spatial position of liquid injection needle to complete liquid injection action;Liquid injection cavity includes cavity cover plate and cavity side wall;Waste liquid collection component;Waste liquid collection component is used to collect the electrolyte that liquid injection needle drops;Carrying component, including sliding carrying platform and shift component three, shift component three is installed on sliding carrying platform, carrying component three is connected with cavity cover plate;Electrolyte recovery component, including shift component four and liquid receiving device;The beneficial effects of the application are that: liquid injection precision is high, and liquid injection amount and liquid injection speed are controllable, which can improve the quality and service life of the battery;High degree of automation and liquid injection efficiency;Waste liquid can be automatically collected, and cleaning is simple, which reduces the maintenance cost of equipment;Electrolyte can be recycled, waste is reduced, and cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of lithium battery production equipment, in particular to a lithium battery liquid injection mechanism. BACKGROUND

[0002] Lithium battery is a new type of environmentally friendly battery with high energy density, light weight and no lead, mercury and other heavy metals. With the rapid development of electric vehicles, the demand for lithium ion batteries is increasing. In order to meet the growing demand for lithium ion batteries, battery manufacturers continuously improve the degree of mechanical automation in the battery production process to speed up the battery production efficiency, and at the same time, the production technology of the battery has also been improved and developed.

[0003] The production process of lithium battery includes positive and negative material mixing, coating, rolling, sheet making, winding or stacking, liquid injection, sealing and other processes. As a key step, liquid injection directly affects the performance and quality of the battery. The existing liquid injection equipment has the following defects: 1. Direct injection method cannot accurately control the injection amount and injection speed, and the injection flow and accuracy are low, which affects the battery life, quality and reliability. 2. Electrolyte is a corrosive liquid that needs to be cleaned in time. The existing liquid injection equipment needs to be lifted and cleaned after injection. The limited space and complex design defects make it difficult for manual cleaning and maintenance, and the cost of manual maintenance and cleaning is high. 3. The existing liquid injection equipment has low degree of automation and can only inject a small amount of batteries at the same time. SUMMARY

[0004] (I) Problems to be solved

[0005] The technical problem to be solved by the present application is to provide a lithium battery liquid injection mechanism in view of the current situation of the prior art.

[0006] (II) Technical solutions

[0007] The present application is realized by the following technical solutions: the present application provides a lithium battery liquid injection mechanism, comprising: a liquid injection needle assembly, a liquid injection cavity, a waste liquid collection assembly, a carrying assembly and an electrolyte recovery assembly. The liquid injection needle assembly comprises a displacement assembly I and a plurality of liquid injection needles, and the liquid injection needle assembly is arranged on the cavity cover plate of the liquid injection cavity. The displacement assembly I is used to move and adjust the spatial position of the liquid injection needle to complete the liquid injection action. The liquid injection cavity comprises a cavity cover plate and a cavity side wall. The waste liquid collection assembly comprises a displacement assembly II and a waste liquid box, and the waste liquid box is arranged in the liquid injection cavity. The waste liquid collection assembly is used to collect the electrolyte dropped by the liquid injection needle. The carrying assembly comprises a sliding carrying platform and a displacement assembly III, the displacement assembly III is installed on the sliding carrying platform, and the displacement assembly III is connected with the cavity cover plate. The carrying assembly is used to carry the cavity cover plate to move above the electrolyte recovery assembly. The electrolyte recovery assembly comprises a displacement assembly IV and a liquid receiving device. The electrolyte recovery assembly is used to recover the electrolyte.

[0008] By adopting the above technical solutions, the setting of multiple liquid injection needles, displacement assemblies and carrying assemblies can realize the automatic carrying and liquid injection operation of multiple batteries at a time, so as to improve the efficiency of battery production. Since the liquid injection needle is a high-vacuum valve liquid injection needle and the liquid injection cavity works in a vacuum environment, the injection amount and injection speed of the battery can be accurately controlled, the liquid injection precision is improved, and the performance and reliability of the battery are improved. At the same time, the present technical solution can realize the automatic collection of electrolyte waste liquid and the recovery of electrolyte during production by installing the waste liquid collection assembly and the electrolyte recovery assembly, thereby saving the cleaning and maintenance cost.

[0009] Further, the displacement assembly I, the displacement assembly II, the displacement assembly III and the displacement assembly IV are air cylinders.

[0010] By adopting the above technical solutions, the air cylinders are used to accurately and efficiently move each component in the liquid injection mechanism, so as to realize automatic control.

[0011] Further, the liquid injection needle assembly further comprises a fixing plate, a reinforcing rib, a guide rail slider, a sealing ring and a sealing ring. The liquid injection needle and the displacement assembly I are installed on the guide rail slider, the guide rail slider is installed on the fixing plate, the fixing plate is connected with the reinforcing rib, and the fixing plate and the reinforcing rib are installed on the cavity cover plate.

[0012] By adopting the above technical solutions, the fixing plate and the reinforcing rib fix the liquid injection needle assembly on the cavity cover plate to provide stability; the guide rail slider and the displacement assembly I can accurately move the liquid injection needle to the predetermined position; and the sealing ring and the sealing ring ensure that the vacuum environment during liquid injection is not damaged.

[0013] Further, the liquid injection cavity is also provided with an air pipe and a clamping assembly. The air pipe is installed on the side wall of the cavity, and when the clamping assembly fixes the cavity cover plate on the side wall of the cavity, the carrying assembly can carry the entire liquid injection cavity. When the clamping assembly does not fix the cavity cover plate on the side wall of the cavity, the carrying assembly carries the cavity cover plate and the liquid injection needle assembly. The middle part of the side wall of the cavity is provided with a transparent PC plate, and the side wall of the cavity is provided with a sealing strip or a sealing ring between the side wall of the cavity.

[0014] By adopting the above technical scheme, the liquid injection cavity can be vacuumized through the air pipe, and the sealing strip ensures that the sealed environment in the liquid injection cavity is not damaged. Since the middle part of the side wall of the cavity is provided with a transparent PC plate, the liquid injection process in the liquid injection cavity can be observed through the PC plate.

[0015] Further, the waste liquid collecting assembly further includes a sealing box, a moving block, a connecting block, a fixed block and a sliding shaft. The shifting assembly four is connected with the sealing box, the sealing box is arranged outside the liquid injection cavity, and the sealing box and the shifting assembly four are connected with the moving block. The fixed block is connected with the liquid injection cavity, the sliding shaft is connected with the fixed block, and the moving block is arranged on the sliding shaft. The moving block is connected with the connecting block, the connecting block is connected with a plurality of waste liquid boxes, and the fixed block is used for fixing the waste liquid collecting assembly part in the liquid injection cavity. When the waste liquid collecting assembly works, the shifting assembly four drives the moving block to slide on the sliding shaft, the moving block drives the connecting block to move, and the connecting block drives the waste liquid box to move to collect the electrolyte dropped by the liquid injection needle.

[0016] By adopting the above technical scheme, the shifting assembly four is connected with the sealing box, the sealing box is arranged outside the liquid injection cavity, the shifting assembly four is arranged outside the liquid injection cavity, the cylinder is separated from the vacuum environment, can work normally, and the waste liquid box can be accurately moved to the predetermined position below the liquid injection needle. The waste liquid collecting assembly part is arranged in the liquid injection cavity to facilitate the collection of the dropped electrolyte, prevent the waste liquid from corroding the mechanism, and reduce the maintenance cost.

[0017] Further, the carrying assembly further includes a fixed plate, a mounting plate, a guide rail, a screw rod module and a servo motor. The mounting plate is connected with the fixed plate, the screw rod module and the servo motor are installed on the mounting plate, and the servo motor is connected with the screw rod module. The guide rail is installed on the fixed plate, the sliding carrying platform is installed on the guide rail, and the sliding carrying platform is connected with the screw rod module. In addition, the carrying assembly further includes a guide shaft support, a cylinder floating joint, a guide column, a foot support and a stable cylinder. The shifting assembly three is connected with the cylinder floating joint, and the shifting assembly three is connected with the cavity cover plate through the cylinder floating joint. The guide column is installed on the sliding carrying platform, the guide shaft support is installed on the cavity cover plate, and the guide column is connected with the guide shaft support. The foot support is installed on the fixed plate, the stable cylinder is connected with the fixed plate, and the horizontal height of the sliding carrying platform is between the horizontal height of the stable cylinder and the horizontal height of the fixed plate.

[0018] By adopting the technical scheme, the servo motor is applied to the screw module to automatically displace the sliding carrying platform with high precision, high efficiency, stability and reliability.

[0019] Further, the liquid receiving device comprises a liquid receiving seat, a buffer pot and a fool-proof assembly, and the liquid receiving seat is connected with the displacement assembly. The electrolyte recovery assembly further comprises a guide column, a diaphragm valve, a filter funnel and a base. The guide column is connected with the liquid receiving device, the diaphragm valve is connected with the buffer pot, and the filter funnel is installed at the lower part of the base.

[0020] By adopting the technical scheme, the diaphragm valve and the filter funnel can filter the recovered electrolyte, ensure the purity of the electrolyte, improve the utilization rate of the electrolyte and reduce waste. When the carrying assembly carries the cavity cover plate to the predetermined position, the liquid injection needle assembly is also brought over. At this time, the displacement assembly four lifts the liquid receiving device, the liquid injection needle cooperates with the liquid receiving seat, and the fool-proof assembly can ensure that the liquid injection needle and the liquid receiving seat can be successfully cooperated. Finally, the electrolyte in the liquid injection needle or the electrolyte tank connected with the liquid injection needle is pumped away.

[0021] (Three) beneficial effects

[0022] 1. The liquid injection cavity of the present application maintains vacuum inside during operation, and the battery liquid injection adopts a vacuum liquid injection mode, which can accurately control the liquid injection amount and the liquid injection speed, has higher liquid injection precision and can ensure uniform distribution of electrolyte in the battery, thereby improving the quality and service life of the battery. In addition, the present application has high automation degree and is provided with multiple liquid injection needles, which can simultaneously inject liquid into multiple batteries, thereby improving the efficiency of battery production and saving labor cost, and is suitable for batch production of battery production line.

[0023] 2. The present application can automatically collect the electrolyte dropped from the liquid injection needle by using the waste liquid collection assembly and the electrolyte recovery assembly, and recycle the electrolyte inside the liquid injection mechanism. Not only can the corrosion, pollution and blockage of the electrolyte to the liquid injection needle assembly and other components of the mechanism be avoided, but also the waste of electrolyte can be reduced, thereby reducing the cost. At the same time, the internal structure of the cavity is reasonably designed, and when manual cleaning is required, the cavity cover plate only needs to be opened for cleaning, which is simple and can save maintenance cost. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application, and are incorporated in and constitute a part of this application. The embodiments of the present application illustrated in the drawings and their descriptions are used to explain the present application, and do not constitute an improper limitation on the present application.

[0025] Figure 1 is a perspective view of the lithium battery liquid injection mechanism according to the present application;

[0026] Figure 2 Figure 1 is a structural schematic diagram of an injection needle assembly in a lithium battery injection mechanism according to the present application;

[0027] Figure 3 Figure 2 is an exploded structural diagram of an injection cavity in a lithium battery injection mechanism according to the present application;

[0028] Figure 4 Figure 3 is an exploded structural diagram of a waste liquid collection assembly in a lithium battery injection mechanism according to the present application;

[0029] Figure 5 Figure 4 is a structural schematic diagram of a carrying assembly in a lithium battery injection mechanism according to the present application;

[0030] Figure 6 Figure 5 is an exploded structural diagram of an electrolyte recovery assembly in a lithium battery injection mechanism according to the present application;

[0031] The following is the meaning of the reference signs:

[0032] 1, injection needle assembly; 2, injection cavity; 3, waste liquid collection assembly; 4, carrying assembly; 5, electrolyte recovery assembly; 10, displacement assembly one; 11, injection needle; 12, fixed plate; 13, reinforcing rib; 14, guide rail sliding block; 15, sealing ring; 16, sealing ring; 20, cavity cover plate; 21, cavity side wall; 22, air pipe; 23, clamping assembly; 24, PC board; 25, sealing strip; 30, displacement assembly two; 31, waste liquid box; 32, sealing box; 33, moving block; 34, connecting block; 35, fixed block; 36, sliding shaft; 40, displacement assembly three; 41, sliding carrying platform; 42, fixed plate; 43, mounting plate; 44, guide rail; 45, screw module; 46, servo motor; 47, guide shaft support; 48, air cylinder floating joint; 49, guide column; 401, stable air cylinder; 402, foot stand; 50, displacement assembly four; 51, liquid receiving device; 52, liquid receiving seat; 53, buffer pot; 54, foolproof assembly; 55, diaphragm valve; 56, filter funnel; 57, base; 60, air cylinder. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0034] In the description of the present application, it should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0035] In the description of the present application, it should be understood that the terms "thickness", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0036] Please refer to Figures 1-6 The present application provides a technical solution: a lithium battery liquid injection mechanism, comprising a liquid injection needle assembly 1, a liquid injection cavity 2, a waste liquid collection assembly 3, a carrying assembly 4 and an electrolyte recovery assembly 5. The liquid injection needle assembly 1 comprises a displacement assembly 10 and a plurality of liquid injection needles 11, and the liquid injection assembly is arranged on the cavity cover plate 20 of the liquid injection cavity 2. The displacement assembly 10 is used to move and adjust the spatial position of the liquid injection needle 11 to complete the liquid injection action. The liquid injection cavity 2 comprises a cavity cover plate 20 and a cavity side wall 21. The waste liquid collection assembly 3 comprises a displacement assembly 30 and a waste liquid box 31, and the waste liquid box 31 is arranged in the liquid injection cavity 2. The waste liquid collection assembly 3 is used to collect the electrolyte dropped by the liquid injection needle 11. The carrying assembly 4 comprises a sliding carrying platform 41 and a displacement assembly 40, the displacement assembly 40 is installed on the sliding carrying platform 41, and the carrying assembly 4 is connected with the cavity cover plate 20. The carrying assembly 4 is used to carry the cavity cover plate 20 to move above the electrolyte recovery assembly 5. The electrolyte recovery assembly 5 comprises a displacement assembly 50 and a liquid receiving device 51. The electrolyte recovery assembly 5 is used to recover the electrolyte in the liquid injection needle 11.

[0037] Specifically, the displacement assembly 10, the displacement assembly 30, the displacement assembly 40 and the displacement assembly 50 are air cylinders 60.

[0038] Specifically, the liquid injection needle assembly 1 further comprises a fixed plate 42, a reinforcing rib 13, a guide rail 44, a sliding block 14, a sealing ring 15 and a sealing ring 16. The liquid injection needle 11 and the displacement assembly 10 are installed on the guide rail 44 sliding block 14, the guide rail 44 sliding block 14 is installed on the fixed plate 42, the fixed plate 42 is connected with the reinforcing rib 13, and the fixed plate 42 and the reinforcing rib 13 are installed on the cavity cover plate 20.

[0039] Specifically, the liquid injection cavity 2 is also provided with an air pipe 22 and a clamping assembly 23. The air pipe 22 is installed on the cavity side wall 21. When the clamping assembly 23 fixes the cavity cover plate 20 on the cavity side wall 21, the carrying assembly 4 can carry the entire liquid injection cavity 2. When the clamping assembly 23 does not fix the cavity cover plate 20 on the cavity side wall 21, the carrying assembly 4 carries the cavity cover plate 20 and the liquid injection needle assembly 1.

[0040] Specifically, the middle part of the cavity side wall 21 is provided with a transparent PC plate 24. The cavity side wall 21 and the cavity side wall 21 are provided with a sealing strip 25 or a sealing ring 16.

[0041] Specifically, the waste liquid collection assembly 3 further includes a sealing box 32, a moving block 33, a connecting block 34, a fixing block 35, and a sliding shaft 36. The displacement assembly four 50 is connected with the sealing box 32. The sealing box 32 is arranged outside the liquid injection cavity 2. The sealing box 32 and the displacement assembly four 50 are connected with the moving block 33. The fixing block 35 is connected with the liquid injection cavity 2. The sliding shaft 36 is connected with the fixing block 35. The moving block 33 is arranged on the sliding shaft 36. The moving block 33 is connected with the connecting block 34. The connecting block 34 is connected with a plurality of waste liquid boxes 31. The fixing block 35 is used for fixing the waste liquid collection assembly 3 partially inside the liquid injection cavity 2. When the waste liquid collection assembly 3 works, the displacement assembly four 50 drives the moving block 33 to slide on the sliding shaft 36. The moving block 33 drives the connecting block 34 to move. The connecting block 34 drives the waste liquid box 31 to move to collect the electrolyte dropped by the liquid injection needle 11.

[0042] Specifically, the carrying assembly 4 further includes a fixed plate 42, a mounting plate 43, a guide rail 44, a screw rod module 45, and a servo motor 46. The mounting plate 43 is connected with the fixed plate 42 and arranged above the fixed plate 42. The screw rod module 45 and the servo motor 46 are installed on the mounting plate 43. The servo motor 46 is connected with the screw rod module 45. The guide rail 44 is installed on the fixed plate 42. The sliding carrying platform 41 is installed on the guide rail 44. The sliding carrying platform 41 is connected with the screw rod module 45.

[0043] Specifically, the carrying assembly 4 further includes a guide shaft support 47, a cylinder floating joint 48, a guide column 49, a foot base 402, and a stabilizing cylinder 401. The displacement assembly three 40 is connected with the cylinder floating joint 48. The displacement assembly three 40 is connected with the cavity cover plate 20 through the cylinder floating joint 48. The guide column 49 is installed on the sliding carrying platform 41. The guide shaft support 47 is installed on the cavity cover plate 20. The guide column 49 is connected with the guide shaft support 47. The foot base 402 is installed on the fixed plate 42. The stabilizing cylinder 401 is connected with the fixed plate 42. The horizontal height of the sliding carrying platform 41 is between the horizontal height of the stabilizing cylinder 401 and the horizontal height of the fixed plate 42.

[0044] Specifically, the liquid receiving device 51 comprises a liquid receiving seat 52, a buffer pot 53 and a fool-proof assembly 54, and the liquid receiving seat 52 is connected with the displacement assembly four 50.

[0045] Specifically, the electrolyte recovery assembly 5 further comprises a guide column 49, a diaphragm valve 55, a filter funnel 56 and a base 57. The guide column 49 is connected with the liquid receiving device 51, the diaphragm valve 55 is connected with the buffer pot 53, and the filter funnel 56 is installed at the lower part of the base 57.

[0046] In the present application, in order to realize automatic liquid injection for lithium batteries, the electrolyte tank is connected with the liquid injection needle 11, and the cylinder 60 is used as a displacement assembly to facilitate the automatic control of the movement of each component in the liquid injection process. In order to ensure the vacuum degree in the cavity, the sealing ring 15 and the sealing ring 16 are used to ensure the sealing property; the air pipe 22 of the liquid injection cavity 2 is connected with a vacuum control device, and the liquid receiving device 51 is connected with a pneumatic control device. When the clamp loaded with the battery cell moves to the lower part of the liquid injection cavity 2, the displacement assembly three 40 drives the liquid injection cavity 2 to press down and cover the battery clamp, and then the air inside the cavity is extracted through the side air pipe 22 to ensure that the battery is always in a vacuum environment for liquid injection, thereby ensuring the precision and quality of the battery liquid injection. When the vacuum degree reaches a predetermined value, the liquid injection needle 11 can be lowered by the displacement assembly one 10 to inject the electrolyte. Subsequently, the liquid injection needle 11 is lifted by the displacement assembly one 10, the displacement assembly two 30 is extended, and the waste liquid box 31 of the waste liquid collection assembly 3 is moved to the lower part of the liquid injection needle 11 to collect the electrolyte dripping therefrom. Then the displacement assembly three 40 drives the liquid injection cavity 2 to rise, and the claw cylinder in the clamping assembly 23 is retracted to open the clamping claw. Subsequently, the cavity cover plate 20 and the liquid injection needle assembly 1 are carried to a predetermined position above the electrolyte recovery assembly 5 by the carrying assembly 4, the liquid injection needle 11 is lowered by the displacement assembly one 10, and the liquid receiving seat 52 is lifted to align with the liquid injection needle 11 by the displacement assembly four 50. Finally, the electrolyte in the liquid injection needle 11 or the electrolyte tank connected with the liquid injection needle 11 is extracted to the electrolyte recovery assembly 5 by the pneumatic control device, and the electrolyte with impurities removed can be reused by filtration. After the electrolyte is recovered, the liquid injection needle 11 is lifted to the original position by the displacement assembly one 10, the cavity cover plate 20 and the liquid injection needle assembly 1 are carried to the upper part of the liquid injection cavity 2 by the carrying assembly 4, and the cavity cover plate 20 and the liquid injection needle assembly 1 are lowered to the cavity side wall 21 by the displacement assembly three 40, and the claw cylinder in the clamping assembly 23 is extended to close the clamping claw.

[0047] Example one

[0048] In the embodiment, the liquid injection cavity 2 is a spliced liquid injection cavity 2, the side wall of the liquid injection cavity 2 is fixed by screw connection, and a sealing ring 16 or a sealing strip 25 is arranged between the side walls to ensure the sealing of the cavity. Under the condition of ensuring the controllable vacuum degree, the pressure inside the liquid injection cavity 2 can be less than or equal to 5KPa within 60S. The cavity cover plate 20 can be separated, the cavity side wall 21 clamping block is clamped and released by the air cylinder clamping jaw of the clamping assembly 23 on the cover plate. This design realizes the separation of the vacuum liquid injection cavity 2 and the liquid injection needle assembly 1, and facilitates the cleaning of the sealing plug of the liquid injection needle 11 and the inside of the cavity. The cavity side wall 21 is hollowed out to install the PC board 24 to realize the transparency of the cavity, which facilitates the observation of the liquid injection process inside the cavity and the adjustment of the liquid injection precision of the internal liquid injection needle 11.

[0049] Embodiment two

[0050] In the embodiment, the carrying assembly 4 is fixed on the rack through ten up-down adjustable foot supports 402 to ensure the stable operation of the whole liquid injection mechanism. The carrying mechanism can move the liquid injection cavity 2 and the liquid injection needle assembly 1 through the guide rail 44, the screw rod module 45 and the servo motor 46, and can realize the lifting and pressing of the liquid injection cavity 2 through the shifting assembly three 40 on the sliding carrying platform 41. The liquid injection cavity 2 is provided with sufficient pressing load, so as to ensure the sealing of the liquid injection cavity 2. After each liquid injection is completed, the residual electrolyte in the liquid injection system needs to be cleaned, that is, the liquid injection assembly and the waste liquid collection assembly 3 are carried to the electrolyte recovery assembly 5 for filtration and recovery treatment. At this time, the sliding carrying platform 41 slides on the guide rail 44 along the X axis, the sliding carrying platform 41, the cavity cover plate 20 and the liquid injection needle assembly 1 are connected through the guide column 49, the guide shaft support 47 and the shifting assembly three 40, and the cavity cover plate 20 and the liquid injection needle assembly 1 are driven by the screw rod module 45 to move on the X axis under the power of the servo motor 46.

[0051] Embodiment three

[0052] In the embodiment, the liquid injection needle assembly 1 is locked on the cavity cover plate 20 through the fixing plate 42 and the reinforcing rib 13, a plurality of liquid injection needles 11 are designed to improve the liquid injection efficiency, the liquid injection needle 11 is installed on the guide rail 44 sliding block 14 and is provided with a power source by the shifting assembly one 10 to realize the liquid injection action. When the liquid injection needle 11 injects, the liquid injection needle 11 and the cavity are sealed by the sealing ring 15 and the sealing ring 16 to ensure the sealing and air tightness of the cavity. The electrolyte is first injected into the liquid injection cup by the liquid injection needle 11, and then enters the battery cell through the vacuum breathing mode. The battery cell liquid injection amount is parameterized, and the electrolyte density and the liquid injection amount can be adjusted by manual input controller.

[0053] Embodiment four

[0054] In this embodiment, in order to prevent battery liquid from dropping on the injection needle 11 after each injection to contaminate the battery cell. The waste collection assembly is designed to collect the waste liquid dropped from the injection needle 11. Considering the internal pressure of the vacuum cavity to the failure of the air cylinder, the air cylinder is selected to be externally mounted. The air cylinder is installed in the sealing box 32 and is set outside the injection cavity 2. The waste box is fixed in the cavity by the fixed block 35, and the displacement assembly two 30 pushes the moving block 33, the moving block 33 drives the connecting block 34, and the connecting block 34 drives the waste liquid box 31 to complete the work of collecting waste liquid. In addition, the waste box is designed to be easy to disassemble, wash and replace.

[0055] Embodiment five

[0056] In this embodiment, in order to solve the problems of existing equipment such as difficult cleaning and recycling of electrolyte, an automatic recycling mechanism is designed to solve the problems of difficult manual cleaning and recycling of electrolyte. First, the mechanism is fixed by the base 57, the displacement assembly four 50 is installed on the liquid receiving device 51, and the guide column 49 guide sleeve is used to realize the up and down movement of the liquid receiving seat 52. When working, the displacement assembly four 50 lifts the liquid receiving device 51, the foolproof assembly 54 is opened, the liquid receiving seat 52 is matched with the injection needle 11, and then the electrolyte waste is recycled by the pneumatic control equipment. The waste liquid is buffered by the buffer pot 53, filtered by the diaphragm valve 55 for the first time, and finally flows into the filter funnel 56 for the second time.

[0057] The above described embodiments of the disclosed embodiments enable those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A lithium battery liquid injection mechanism, characterized by, The application relates to a liquid injection device. The liquid injection device comprises a liquid injection needle assembly, a liquid injection cavity, a waste liquid collecting assembly, a carrying assembly and an electrolyte recycling assembly. The liquid injection needle assembly comprises a displacement assembly I and a plurality of liquid injection needles. The liquid injection needle assembly is arranged on a cavity cover plate of the liquid injection cavity. The displacement assembly I is used for moving and adjusting the spatial position of the liquid injection needle to complete a liquid injection action. The liquid injection cavity comprises the cavity cover plate and a cavity side wall. The liquid injection cavity is also provided with an air pipe which is used for vacuumizing the liquid injection cavity. The waste liquid collecting assembly comprises a displacement assembly II and a waste liquid box.

2. The lithium battery liquid injection mechanism according to claim 1, characterized in that: The waste liquid box is arranged in the liquid injection cavity.

3. The lithium battery liquid injection mechanism according to claim 1, wherein: The waste liquid collecting assembly is used for collecting the electrolyte dropped by the liquid injection needle.

4. The lithium battery liquid injection mechanism according to claim 1, wherein: The waste liquid collecting assembly further comprises a sealing box, a moving block, a connecting block, a fixing block and a sliding shaft.

5. The lithium battery liquid injection mechanism according to claim 1, wherein: The displacement assembly IV is connected with the sealing box.

6. The lithium battery liquid injection mechanism according to claim 1, wherein: The sealing box is arranged outside the liquid injection cavity. The sealing box and the displacement assembly IV are connected with the moving block. The fixing block is connected with the liquid injection cavity. The sliding shaft is connected with the fixing block. The moving block is arranged on the sliding shaft. The moving block is connected with the connecting block. The connecting block is connected with a plurality of waste liquid boxes. The fixing block is used for fixing the waste liquid collecting assembly in the liquid injection cavity. When the waste liquid collecting assembly works, the displacement assembly IV drives the moving block to slide on the sliding shaft. The moving block drives the connecting block to move. The connecting block drives the waste liquid box to move to collect the electrolyte dropped by the liquid injection needle. The carrying assembly comprises a sliding carrying platform and a displacement assembly III. The displacement assembly III is arranged on the sliding carrying platform. The displacement assembly III is connected with the cavity cover plate. The carrying assembly is used for carrying the cavity cover plate to move above the electrolyte recycling assembly. The electrolyte recycling assembly comprises a displacement assembly IV and a liquid receiving device. The displacement assembly I, the displacement assembly II, the displacement assembly III and the displacement assembly IV are air cylinders. The liquid injection needle assembly further comprises a fixing plate, a reinforcing rib, a guide rail sliding block, a sealing ring and a sealing ring. The liquid injection needle and the displacement assembly I are arranged on the guide rail sliding block. The guide rail sliding block is arranged on the fixing plate. The fixing plate is connected with the reinforcing rib. The fixing plate and the reinforcing rib are arranged on the cavity cover plate. The liquid injection cavity is also provided with a clamping assembly. The air pipe is arranged on the cavity side wall. When the clamping assembly fixes the cavity cover plate on the cavity side wall, the carrying assembly can carry the whole liquid injection cavity. When the clamping assembly does not fix the cavity cover plate on the cavity side wall, the carrying assembly carries the cavity cover plate and the liquid injection needle assembly. The middle part of the cavity side wall is provided with a transparent PC plate. Sealing strips or sealing rings are arranged between the cavity side walls. The carrying assembly further comprises a fixing plate, a mounting plate, a guide rail, a screw rod module and a servo motor. The mounting plate is connected with the fixing plate. The screw rod module and the servo motor are arranged on the mounting plate. The servo motor is connected with the screw rod module. The guide rail is arranged on the fixing plate. The sliding carrying platform is arranged on the guide rail. The sliding carrying platform is connected with the screw rod module.

7. The lithium battery liquid injection mechanism according to claim 6, wherein: The carrying assembly further comprises a guide shaft support, a cylinder floating joint, a guide column, a foot base and a stabilizing cylinder; the third displacement assembly is connected with the cylinder floating joint; the third displacement assembly is connected with the cavity cover plate through the cylinder floating joint; the guide column is installed on the sliding carrying platform, the guide shaft support is installed on the cavity cover plate, and the guide column is connected with the guide shaft support; the foot base is installed on the fixed plate; the stabilizing cylinder is connected with the fixed plate; the horizontal height of the sliding carrying platform is between the horizontal height of the stabilizing cylinder and the horizontal height of the fixed plate.

8. The lithium battery liquid injection mechanism according to claim 1, wherein: The liquid receiving device comprises a liquid receiving seat, a buffer kettle and a fool-proof assembly; the liquid receiving seat is connected with the fourth displacement assembly.

9. The lithium battery liquid injection mechanism according to claim 8, wherein: The electrolyte recovery assembly further comprises a guide column, a diaphragm valve, a filter funnel and a base; the guide column is connected with the liquid receiving device; the diaphragm valve is connected with the buffer kettle; the filter funnel is installed at the lower part of the base.

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