A lithium battery liquid injection vacuum packaging device

Abstract

The present invention relates to the technical field of lithium battery liquid injection packaging, and specifically to a lithium battery liquid injection vacuum packaging device, the liquid injection vacuum packaging device comprises a carrying device, a liquid injection device, a negative pressure device and a packaging machine, the carrying device is provided with a plurality of workstations, the liquid injection device and the packaging machine are placed at a plurality of workstations on the carrying device, the negative pressure device and the liquid injection device are connected, the liquid injection device is used to inject liquid into a battery shell, and the packaging machine is used to package the battery shell after the liquid injection is completed, the carrying device serves as the main installation base and is also used for continuous feeding of the battery shell, the negative pressure device is used to create a vacuum, ensure the stability of the liquid injection, and the packaging installation, and prevent electrolyte leakage, by setting a plurality of workstations, the battery shell is processed in multiple steps at the plurality of workstations, so that the device is integrated and the integrated processing efficiency is improved, after the liquid injection is completed, the battery shell is packaged by the packaging machine, the transportation path is reduced, and the electrolyte leakage is prevented.

Description

Technical Field

[0001] The invention relates to the technical field of lithium battery liquid injection packaging, in particular to a lithium battery liquid injection vacuum packaging device. Background Art

[0002] In recent years, with the continuous upgrading of automation equipment, the efficiency of large-scale continuous production has been greatly improved. As one of the commonly used batteries, lithium batteries are widely used in various industries, including soft-pack batteries, cylindrical batteries and square batteries. During production, liquid injection and packaging are required.

[0003] Since the electrolyte of lithium batteries is harmful to the human body, they need to be produced in a vacuum environment. This also makes it inconvenient to monitor the injection and packaging of the battery in real time. Especially in the injection process, the lithium battery cell needs to be dried before injection, and can only be sent to the injection station for injection after drying. Since the cell itself will absorb a certain amount of electrolyte, and the degree of drying of the cell itself is different, the absorption speed and efficiency of the electrolyte will also be different, which will eventually affect the amount of free electrolyte in the battery shell and reduce the service life of the lithium battery.

[0004] In addition, the existing liquid injection device needs to perform multiple injections to finally complete the liquid injection process, which affects the processing efficiency. Summary of the invention

[0005] The purpose of the present invention is to provide a lithium battery liquid injection vacuum packaging device to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a lithium battery liquid injection vacuum packaging device.

[0007] A lithium battery liquid injection vacuum packaging device, the liquid injection vacuum packaging device is used to process the battery shell, the liquid injection vacuum packaging device comprises a carrying device, a liquid injection device, a negative pressure device and a packaging machine, the carrying device is provided with a plurality of workstations, the liquid injection device and the packaging machine are placed at the plurality of workstations on the carrying device, the negative pressure device and the liquid injection device are connected, the liquid injection device is used to inject liquid into the battery shell, and the packaging machine is used to package the battery shell after the liquid injection is completed.

[0008] The battery shell is injected with electrolyte and packaged through the injection vacuum packaging device. The carrying device serves as the main installation basis and is also used for continuous feeding of the battery shell. The negative pressure device is used to create a vacuum to ensure the stability of injection and packaging installation to prevent electrolyte leakage. By setting up multiple workstations, the battery shell is processed in multiple steps at multiple workstations to integrate the device and improve the efficiency of integrated processing. After the injection is completed, the battery shell is packaged by a packaging machine to reduce the transportation path and prevent electrolyte leakage.

[0009] Furthermore, the carrying device includes a workbench and a turntable, a driving motor is provided on one side of the workbench, the output end of the driving motor is transmission-connected to the turntable, the turntable and the workbench are rotationally connected, a plurality of carriers are provided on the upper side of the turntable, a positioning groove is provided on the carrier, and the battery shell is placed in the positioning groove;

[0010] The liquid injection device includes a reservoir, a liquid injection head and a sealing assembly. The reservoir is placed on one side of a workbench. A liquid injection module is provided on the workbench. The movable end of the liquid injection module is tightly connected to the liquid injection head. An injection pump is provided at the output end of the reservoir. The reservoir is connected to the liquid injection head through a pipeline via the liquid injection pump. The sealing assembly is used to seal the upper port of the carrier positioning groove. The negative pressure device includes a vacuum pump. The vacuum pump and the sealing assembly are connected through a pipeline.

[0011] The workbench is used to install the drive motor, which outputs torque to drive the turntable to rotate. The turntable can rotate on a fixed axis on the workbench to transport the battery shells to be processed to each workstation. The carrier is placed on the turntable to transport the battery shells. The carrier installs and fixes the battery shells through the positioning grooves thereon. When the battery shell is transported to the injection station, the injection head is moved to the top of the battery shell through the injection module. The injection module can adopt the existing module structure to provide linear displacement. The number of lines for the injection module to output linear displacement is set as needed. The battery shell in the positioning groove is evacuated by a vacuum pump, and the vacuum is maintained by a sealing component to prevent leakage. The reservoir transports the electrolyte to the injection head through the injection pump, and the injection head sprays into the inner cavity of the battery shell. Under the negative pressure state, it is convenient for the battery cell to absorb the electrolyte, thereby achieving the purpose of rapid infiltration.

[0012] Furthermore, the sealing assembly includes a sealing seat, a clamping block and a wedge block. The sealing seat is placed on the upper side of the carrier, a slot is provided on the carrier, the lower end of the sealing seat is inserted into the slot of the carrier, a working cavity is provided on the sealing seat, a plurality of slide grooves are provided along the circumference of the wall of the working cavity, the clamping block is slidably connected with the slide groove, the slide groove is arranged obliquely, the inner side of the slide groove is the low end, a clamping ring is provided on the injection head, a transmission groove is provided on the clamping block, a clamping spring is provided in the transmission groove, an inclined surface on one side of the wedge block is slidably connected with an inclined surface on the transmission groove, a clamping groove is provided on the side of the wedge block away from the inclined surface, and the clamping spring is inserted into the clamping groove on the side away from the transmission groove;

[0013] When injecting liquid: the lower side of the retaining ring and the upper end of the wedge are in contact.

[0014] Before liquid injection, it is necessary to create a vacuum atmosphere to facilitate the electrolyte to infiltrate the battery cell. A slot is set on the carrier, and a corresponding protrusion is set on the lower side of the sealing seat. At the loading station, the sealing seat is placed on the carrier through the material taking and unloading robot. At this time, multiple blocks in the working chamber are contacted in sequence to form a disc shape, and the end is inserted into the slide groove, so that the space where the battery shell is located forms a sealed space, which is convenient for vacuuming and liquid injection. After the vacuuming is completed, the liquid injection module drives the liquid injection head downward. During the downward process of the liquid injection head, the clamp ring abuts against the upper end of the wedge block, pressing the wedge block downward, and the wedge The block slides along the slot under the action of downward pressure, overcomes the action of the clamping spring and moves downward, and pushes the block to shrink along the slide slot through the inclined surface on the side, so that the injection head can be inserted into the space above the battery shell, which is convenient for the injection operation. Due to the existence of the working chamber, the injection of the battery shell can exceed the height of the inner cavity of the battery shell itself, that is, the electrolyte absorbed by the battery cell is pre-compensated, so that only one injection is required, and there is no need to add additional processes later to compensate for the electrolyte absorbed by the battery cell, thereby ensuring the accuracy and efficiency of the injection.

[0015] Furthermore, the negative pressure device also includes a detection component, a negative pressure flow channel is provided on the sealing seat, the negative pressure flow channel is located at the lower side of the slide groove, a sealing detection chamber is provided in the middle section of the negative pressure flow channel, the vacuum pump and the negative pressure flow channel pipeline are connected, the detection component includes a transducer plate and a coil, the transducer plate and the sealing detection chamber are rotatably connected, the upper end of the transducer plate is inserted into the negative pressure flow channel, a bias rod is provided at the lower end of the transducer plate, one end of the bias rod is abutted against the transducer plate, the bias rod and the sealing detection chamber are slidably connected, the coil is placed in the sealing detection chamber, the bias rod is made of a magnet, and the axis of the bias rod coincides with the axis of the coil.

[0016] Before liquid injection, since the working chamber is located at the space under the card block and forms a sealed space with the inner cavity of the battery shell, air is evacuated by a vacuum pump, and the negative pressure flow channel is connected with the sealed space to discharge the gas therein. An ejection groove is arranged at the lower end of the positioning groove, and a built-in ejection cylinder is arranged therein, and the ejection groove is connected with the outside atmosphere. During the exhaust process, as the air pressure in the inner cavity of the battery shell decreases, the upper end of the battery shell and the bottom surface of the sealing seat are fitted together under the action of the outside atmosphere to ensure the sealing performance. When the battery shell itself has defects such as local damage, the air pressure inside the battery shell is low and the outside air pressure is high. Under the action of pressure difference, external gas will enter the battery shell. When the vacuum pump is at equal power output, as external gas enters the battery shell, the gas flow through the transducer plate increases, that is, the force acting on the transducer plate becomes larger, thereby increasing the rotation angle of the transducer plate and driving the bias rod to move longer. The bias rod is made of magnet material and moves in the inner circle of the coil. The coil cuts the magnetic flux lines and the induced current generated increases, thereby detecting the sealing of the battery shell itself to prevent the electrolyte from being injected into the damaged battery shell and causing leakage.

[0017] Furthermore, an enrichment chamber is provided at one end of the negative pressure flow channel away from the working chamber, and the vacuum pump is connected to the middle part of the upper end of the enrichment chamber. The detection component also includes an enrichment block, which is in the shape of an inverted teardrop and is placed in the enrichment chamber. The enrichment chamber and the enrichment block are adapted to each other, and the side curvature of the enrichment block is arranged to increase upward from the bottom.

[0018] Before the battery shell is sent to the injection station, the pre-process needs to dry the battery shell. After drying, the wetting effect of the battery shell and the battery cell can be guaranteed as much as possible. Due to the difference in the drying of the battery cells, it is easy to cause differences in the water content of the battery cells, affecting the subsequent electrolyte infiltration effect. Therefore, during the vacuum process, the water in the battery cells will continue to evaporate and enter the enrichment chamber along the negative pressure flow channel. Through the drop-shaped setting of the enrichment block and the gradual curvature setting, the curvature of the upward process gradually increases, and the radius of curvature gradually decreases, so that the centrifugal force on the water vapor in the airflow increases and adheres to the outer wall, thereby separating and enriching the water vapor.

[0019] Furthermore, the detection component also includes two electrode plates. A moisture measuring channel is provided on the upper side of the enrichment chamber. The two electrode plates are placed on the walls on both sides of the moisture measuring channel. The two electrode plates are electrically connected to two wiring terminals of the power supply respectively.

[0020] The enriched water vapor enters the moisture measuring channel at the upper end of the enrichment chamber. The moisture measuring channel is electrically connected to the power supply to form a moisture measuring circuit. The current of the moisture measuring circuit is proportional to the humidity between the two electrode plates. That is, the higher the humidity, the greater the current of the moisture measuring circuit. As the water vapor is enriched, the unit density increases, that is, the detection sensitivity increases, which helps to ensure that the battery cell maintains the same moisture content, thereby ensuring the accuracy of the injected electrolyte.

[0021] As an optimization, the humidity measuring channel is annular, converges upward, and the electrode plate is located in the convergence section of the humidity measuring channel. The annular setting of the humidity measuring channel facilitates water vapor collection. When the water vapor converges upward, as the flow cross section decreases, it is equivalent to secondary enrichment of the water vapor, which helps to ensure the detection accuracy.

[0022] As an optimization, the rotation axis of the transducer plate is located on the upper side of the horizontal center plane. By rotating the transducer plate eccentrically, the transducer plate can maintain a vertical state under its own gravity, and will rotate when affected by wind. When the wind stops, the transducer plate can automatically reset.

[0023] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: due to the presence of the working chamber, the liquid injection into the battery shell can exceed the height of the inner cavity of the battery shell itself, that is, the electrolyte absorbed by the battery cell is pre-compensated, so that only one injection is required, and no additional process is required to be added later to compensate for the electrolyte absorbed by the battery cell, thereby ensuring the accuracy and efficiency of the injection; when the battery shell itself has defects such as local damage, since the internal air pressure of the battery shell is low and the external air pressure is high, under the action of the pressure difference, the external gas will enter the battery shell, and when the vacuum pump is at equal power output, as the external gas enters the battery shell, the gas flow through the transducer plate increases, that is, the force acting on the transducer plate becomes larger, thereby increasing the rotation angle of the transducer plate and extending the distance the bias rod moves, and the bias rod is made of a magnet material and moves in the inner circle of the coil, and the coil is used to cut the magnetic flux lines. The induced current generated by the movement increases, thereby detecting the sealing of the battery shell itself to prevent the electrolyte from being injected into the damaged battery shell and causing leakage; therefore, during the vacuum pumping process, the water in the battery cell will continue to evaporate and enter the enrichment chamber along the negative pressure flow channel. Through the droplet-shaped setting of the enrichment block and the gradual curvature setting, the curvature gradually increases in the upward process, and the radius of curvature gradually decreases, so that the centrifugal force on the water vapor in the airflow increases and adheres to the outer wall, thereby separating and enriching the water vapor; the enriched water vapor enters the moisture measuring flow channel at the upper end of the enrichment chamber, and the moisture measuring flow channels are respectively electrically connected to the power supply to form a moisture measuring circuit. The current of the moisture measuring circuit is proportional to the humidity between the two electrode plates, that is, the greater the humidity, the greater the current of the moisture measuring circuit. Since the water vapor is enriched, the unit density is increased, that is, the detection sensitivity is improved, which helps to ensure that the battery cell maintains the same moisture content, thereby ensuring the accuracy of the injected electrolyte. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 yes Figure 1 A magnified view of a part of the view;

[0027] Figure 3 It is a schematic structural diagram of the liquid injection device of the present invention;

[0028] Figure 4 is a schematic diagram of the sealing assembly structure of the present invention;

[0029] Figure 5 It is a schematic diagram of the battery shell sealing detection structure of the present invention;

[0030] Figure 6 yes Figure 5 A magnified view of a part B of the view;

[0031] Figure 7 yes Figure 5 A partial C magnified view of the view;

[0032] Figure 8 It is a schematic diagram of the liquid injection state of the present invention;

[0033] In the figure: 1. carrying device; 11. workbench; 12. turntable; 13. carrier; 2. liquid injection device; 21. storage container; 22. liquid injection head; 23. sealing assembly; 231. sealing seat; 2311. negative pressure flow channel; 2312. sealing detection chamber; 2313. moisture detection flow channel; 2314. enrichment chamber; 2315. working chamber; 2316. slide; 232. block; 233. wedge block; 234. snap spring; 24. snap ring; 25. liquid injection module; 3. negative pressure device; 31. vacuum pump; 32. detection assembly; 321. transducer plate; 322. bias rod; 323. coil; 324. electrode plate; 325. enrichment block; 4. packaging machine; 5. battery shell. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0035] See also Figure 1-8 , the present invention provides a technical solution:

[0036] A lithium battery liquid injection vacuum packaging device, the liquid injection vacuum packaging device is used to process a battery shell 5, the liquid injection vacuum packaging device comprises a carrying device 1, a liquid injection device 2, a negative pressure device 3 and a packaging machine 4, the carrying device 1 is provided with a plurality of workstations, the liquid injection device 2 and the packaging machine 4 are placed at a plurality of workstations on the carrying device 1, the negative pressure device 3 is connected to the liquid injection device 2, the liquid injection device 2 is used to inject liquid into the battery shell 5, and the packaging machine 4 is used to package the battery shell 5 after the liquid injection is completed.

[0037] The battery shell 5 is injected with electrolyte and packaged through the liquid injection vacuum packaging device. The supporting device 1 serves as the main installation base and is also used for continuous feeding of the battery shell 5. The negative pressure device 3 is used to create a vacuum to ensure the stability of liquid injection and the packaging installation to prevent electrolyte leakage. By setting up multiple workstations, the battery shell 5 is processed in multiple steps at multiple workstations to integrate the device and improve the integrated processing efficiency. After the liquid injection is completed, the battery shell 5 is packaged by the packaging machine 4 to reduce the transportation path and prevent electrolyte leakage.

[0038] Furthermore, the carrying device 1 includes a workbench 11 and a turntable 12. A driving motor is provided on one side of the workbench 11. The output end of the driving motor is transmission-connected to the turntable 12. The turntable 12 is rotationally connected to the workbench 11. A plurality of carriers 13 are provided on the upper side of the turntable 12. The carriers 13 are provided with positioning grooves, and the battery shell 5 is placed in the positioning grooves.

[0039] The liquid injection device 2 includes a reservoir 21, a liquid injection head 22 and a sealing assembly 23. The reservoir 21 is placed on one side of the workbench 11. A liquid injection module 25 is provided on the workbench 11. The movable end of the liquid injection module 25 is tightly connected to the liquid injection head 22. An injection pump is provided at the output end of the reservoir 21. The reservoir 21 is connected to the liquid injection head 22 through a pipeline. The sealing assembly 23 is used to seal the upper port of the positioning groove of the carrier 13. The negative pressure device 3 includes a vacuum pump 31. The vacuum pump 31 is connected to the sealing assembly 23 through a pipeline.

[0040] The workbench 11 is used to install the drive motor, and the drive motor outputs torque to drive the turntable 12 to rotate. The turntable 12 can rotate on a fixed axis on the workbench 11 to transport the battery shell 5 to be processed to each station. The carrier 13 is placed on the turntable 12 for transporting the battery shell 5. The carrier 13 installs and fixes the battery shell 5 through the positioning groove thereon. When the battery shell 5 is transported to the injection station, the injection head 22 is moved to the top of the battery shell 5 through the injection module 25. The injection module 25 can adopt an existing module structure to provide linear displacement. The number of lines for the injection module 25 to output linear displacement is set as needed. The battery shell 5 in the positioning groove is evacuated by a vacuum pump 31, and the vacuum is maintained by the sealing component 23 to prevent leakage. The reservoir 21 transports the electrolyte to the injection head 22 through the injection pump, and the injection head 22 sprays into the inner cavity of the battery shell 5. Under the negative pressure state, it is convenient for the battery cell to absorb the electrolyte, thereby achieving the purpose of rapid infiltration.

[0041] Further, the sealing assembly 23 includes a sealing seat 231, a clamping block 232 and a wedge block 233. The sealing seat 231 is placed on the upper side of the carrier 13. The carrier 13 is provided with a slot. The lower end of the sealing seat 231 is inserted into the slot of the carrier 13. The sealing seat 231 is provided with a working chamber 2315. A plurality of slide grooves 2316 are provided along the circumference of the wall surface of the working chamber 2315. The clamping block 232 is slidably connected with the slide groove 2316. The slide groove 2316 is arranged obliquely. The inner side of the slide groove 2316 is a low end. A clamping ring 24 is provided on the injection head 22. The clamping block 232 is provided with a transmission groove. A clamping spring 234 is provided in the transmission groove. An inclined surface on one side of the wedge block 233 is slidably connected with an inclined surface on the transmission groove. A clamping groove is provided on the side of the wedge block 233 away from the inclined surface. The clamping spring 234 is inserted into the clamping groove away from the transmission groove.

[0042] During the injection, the lower side of the clamping ring 24 abuts against the upper end of the wedge block 233 .

[0043] Before liquid injection, it is necessary to create a vacuum atmosphere to facilitate the electrolyte to infiltrate the battery cell. A slot is set on the carrier 13, and a corresponding protrusion is set on the lower side of the sealing seat 231. At the loading station, the sealing seat 231 is placed on the carrier 13 by the material taking and unloading robot. At this time, multiple blocks 232 in the working chamber 2315 contact in sequence to form a disc shape, and the end is inserted into the slide groove 2316, so that the space where the battery shell 5 is located forms a sealed space, which is convenient for vacuuming and liquid injection. After the vacuuming is completed, the liquid injection module 25 drives the liquid injection head 22 downward. During the downward movement of the liquid injection head 22, the clamping ring 24 abuts against the upper end of the wedge block 233, and the wedge block 23 3 is pressed down, and the wedge block 233 slides along the card slot under the action of the downward pressure, overcomes the downward movement under the action of the card spring 234, and pushes the card block 232 to shrink along the slide slot 2316 through the inclined surface of the side, so that the injection head 22 can be inserted into the space above the battery shell 5, which is convenient for the injection operation. Due to the existence of the working chamber 2315, the injection of the battery shell 5 can exceed the height of the inner cavity of the battery shell 5 itself, that is, the electrolyte absorbed by the battery cell is pre-compensated, so that only one injection is required, and no additional process is needed to compensate for the electrolyte absorbed by the battery cell, thereby ensuring the injection accuracy and injection efficiency.

[0044] Furthermore, the negative pressure device 3 also includes a detection component 32, a negative pressure flow channel 2311 is provided on the sealing seat 231, the negative pressure flow channel 2311 is located at the lower side of the slide groove 2316, a sealing detection chamber 2312 is provided in the middle section of the negative pressure flow channel 2311, the vacuum pump 31 and the negative pressure flow channel 2311 are connected by a pipeline, the detection component 32 includes a transducer plate 321 and a coil 323, the transducer plate 321 and the sealing detection chamber 2312 are rotatably connected, the upper end of the transducer plate 321 is inserted into the negative pressure flow channel 2311, a bias rod 322 is provided at the lower end of the transducer plate 321, one end of the bias rod 322 is abutted against the transducer plate 321, the bias rod 322 and the sealing detection chamber 2312 are slidably connected, the coil 323 is placed in the sealing detection chamber 2312, the bias rod 322 is made of magnet material, and the axis of the bias rod 322 coincides with the axis of the coil 323.

[0045] Before liquid injection, since the space of the working chamber 2315 located at the lower part of the card block 232 and the inner cavity of the battery shell 5 form a sealed space, the vacuum pump 31 is used to evacuate air, and the negative pressure flow channel 2311 is connected to the sealed space to discharge the gas therein. An ejection groove is arranged at the lower end of the positioning groove, and an ejection cylinder is built in. The ejection groove is connected to the outside atmosphere. During the exhaust process, as the air pressure in the inner cavity of the battery shell 5 decreases, the upper end of the battery shell 5 and the bottom surface of the sealing seat 231 are fitted under the action of the outside atmosphere to ensure the sealing performance. When the battery shell 5 itself has defects such as local damage, since the internal air pressure of the battery shell 5 is low and the external air pressure is high, the battery shell 5 is compressed. Under the action of the differential, external gas will enter the battery shell 5. When the vacuum pump 31 is at equal power output, as the external gas enters the battery shell 5, the gas flow passing through the transducer plate 321 increases, that is, the force acting on the transducer plate 321 becomes larger, thereby increasing the rotation angle of the transducer plate 321 and driving the bias rod 322 to move a longer distance. The bias rod 322 is made of a magnet material and moves in the inner circle of the coil 323. The coil 323 moves to cut the magnetic flux lines, and the induced current generated increases, thereby detecting the sealing of the battery shell 5 itself to prevent the electrolyte from being injected into the damaged battery shell 5 and causing leakage.

[0046] Furthermore, an enrichment chamber 2314 is provided at one end of the negative pressure flow channel 2311 away from the working chamber 2315, and the vacuum pump 31 is connected to the middle of the upper end of the enrichment chamber 2314. The detection component 32 also includes an enrichment block 325, and the enrichment block 325 is in an inverted teardrop shape. The enrichment block 325 is placed in the enrichment chamber 2314, and the enrichment chamber 2314 and the enrichment block 325 are adapted to each other, and the side curvature of the enrichment block 325 is arranged to increase upward from the bottom.

[0047] Before the battery shell 5 is sent to the injection station, the battery shell 5 needs to be dried in the pre-process. After drying, the wetting effect of the battery shell 5 can be guaranteed as much as possible. Due to the difference in the drying of the battery cells, it is easy to cause differences in the water content of the battery cells, affecting the subsequent electrolyte infiltration effect. Therefore, during the vacuumization process, the water in the battery cells will continue to evaporate and enter the enrichment chamber 2314 along the negative pressure flow channel 2311. Through the drop-shaped setting of the enrichment block 325 and the gradual curvature setting, the curvature of the upward process gradually increases, and the radius of curvature gradually decreases, so that the centrifugal force on the water vapor in the airflow increases and adheres to the outer wall, thereby separating and enriching the water vapor.

[0048] Furthermore, the detection component 32 also includes two electrode plates 324. A moisture measuring channel 2313 is provided on the upper side of the enrichment chamber 2314. The two electrode plates 324 are placed on the walls on both sides of the moisture measuring channel 2313. The two electrode plates 324 are electrically connected to two wiring terminals of the power supply respectively.

[0049] The enriched water vapor enters the moisture measuring channel 2313 at the upper end of the enrichment chamber 2314. The moisture measuring channel 2313 is electrically connected to the power supply to form a moisture measuring circuit. The current of the moisture measuring circuit is proportional to the humidity between the two electrode plates 324. That is, the higher the humidity, the greater the current of the moisture measuring circuit. As the water vapor is enriched, the unit density increases, that is, the detection sensitivity increases, which helps to ensure that the battery cell maintains the same moisture content, thereby ensuring the accuracy of the injected electrolyte.

[0050] As an optimization, the moisture sensing channel 2313 is annular, converges upward, and the electrode plate 324 is located at the convergence section of the moisture sensing channel 2313. The annular setting of the moisture sensing channel 2313 facilitates water vapor collection. When the water vapor converges upward, as the flow cross section decreases, it is equivalent to secondary enrichment of the water vapor, which helps to ensure the detection accuracy.

[0051] As an optimization, the rotation axis of the transducer plate 321 is located on the upper side of the horizontal center plane. The transducer plate 321 is eccentrically arranged to rotate around, so that the transducer plate 321 can maintain a vertical state under its own gravity, and will rotate when affected by wind. When the wind stops, the transducer plate 321 can automatically reset.

[0052] The working principle of the present invention is as follows: due to the existence of the working chamber 2315, the injection of the battery shell 5 can exceed the height of the inner cavity of the battery shell 5 itself, that is, the electrolyte absorbed by the battery cell is pre-compensated, so that only one injection is required, and no additional process is needed to be added later to compensate for the electrolyte absorbed by the battery cell, thereby ensuring the accuracy and efficiency of the injection; when the battery shell 5 itself has defects such as local damage, since the internal air pressure of the battery shell 5 is low and the external air pressure is high, under the action of the pressure difference, the external gas will enter the battery shell 5, and when the vacuum pump 31 is at equal power output, as the external gas enters the battery shell 5, the gas flow through the transducer plate 321 increases, that is, the force acting on the transducer plate 321 becomes larger, thereby increasing the rotation angle of the transducer plate 321, driving the bias rod 322 to move longer, the bias rod 322 is made of a magnet material, moves in the inner circle of the coil 323, and the coil 323 moves to cut the magnetic lines of force, generating The induced current increases, thereby detecting the sealing of the battery shell 5 itself to prevent the electrolyte from being injected into the damaged battery shell 5 and causing leakage; therefore, during the vacuum pumping process, the moisture in the battery cell will continue to evaporate and enter the enrichment chamber 2314 along the negative pressure flow channel 2311. Through the droplet-shaped setting of the enrichment block 325 and the gradual curvature setting, the curvature gradually increases in the upward process, and the radius of curvature gradually decreases, so that the centrifugal force on the water vapor in the airflow increases and adheres to the outer wall, thereby separating and enriching the water vapor; the enriched water vapor enters the moisture measuring flow channel 2313 at the upper end of the enrichment chamber 2314, and the moisture measuring flow channel 2313 is respectively electrically connected to the power supply to form a moisture measuring circuit. The current of the moisture measuring circuit is proportional to the humidity between the two electrode plates 324, that is, the greater the humidity, the greater the current of the moisture measuring circuit. Since the water vapor is enriched, the unit density is increased, that is, the detection sensitivity is increased, which helps to ensure that the battery cell maintains the same moisture content, thereby ensuring the accuracy of the injected electrolyte.

[0053] Although the embodiments of the present invention have been shown and described, it is to be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, substitute and vary the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.

Claims

1. A lithium battery liquid injection vacuum packaging device, the liquid injection vacuum packaging device is used to process a battery shell (5), characterized in that: The liquid injection vacuum packaging device comprises a carrying device (1), a liquid injection device (2), a negative pressure device (3) and a packaging machine (4); the carrying device (1) is provided with a plurality of workstations; the liquid injection device (2) and the packaging machine (4) are placed at the plurality of workstations on the carrying device (1); the negative pressure device (3) and the liquid injection device (2) are connected; the liquid injection device (2) is used to inject liquid into a battery shell (5); and the packaging machine (4) is used to package the battery shell (5) after the liquid injection is completed; The carrying device (1) comprises a workbench (11) and a turntable (12); a driving motor is provided on one side of the workbench (11); an output end of the driving motor is in driving connection with the turntable (12); the turntable (12) and the workbench (11) are rotatably connected; a plurality of carriers (13) are provided on the upper side of the turntable (12); positioning grooves are provided on the carriers (13); and the battery shell (5) is placed in the positioning grooves; The liquid injection device (2) comprises a reservoir (21), a liquid injection head (22) and a sealing component (23); the reservoir (21) is placed on one side of a workbench (11); a liquid injection module (25) is provided on the workbench (11); a movable end of the liquid injection module (25) is tightly connected to the liquid injection head (22); an injection pump is provided at the output end of the reservoir (21); the reservoir (21) is connected to the liquid injection head (22) via a pipeline via the liquid injection pump; the sealing component (23) is used to seal an upper port of a positioning groove of the carrier (13); the negative pressure device (3) comprises a vacuum pump (31); the vacuum pump (31) and the sealing component (23) are connected via a pipeline; The sealing assembly (23) comprises a sealing seat (231), a clamping block (232) and a wedge block (233); the sealing seat (231) is placed on the upper side of the carrier (13); a slot is provided on the carrier (13); the lower end of the sealing seat (231) is inserted into the slot of the carrier (13); a working cavity (2315) is provided on the sealing seat (231); a plurality of slide grooves (2316) are provided along the circumferential direction of the wall surface of the working cavity (2315); the clamping block (232) and the slide grooves (2316) is slidably connected, the slide groove (2316) is arranged obliquely, the inner side of the slide groove (2316) is a low end, the injection head (22) is provided with a clamping ring (24), the clamping block (232) is provided with a transmission groove, a clamping spring (234) is provided in the transmission groove, an inclined surface on one side of the wedge block (233) is slidably connected with the inclined surface on the transmission groove, a clamping groove is provided on the side of the wedge block (233) away from the inclined surface, and the clamping spring (234) is inserted into the clamping groove on the side away from the transmission groove; During liquid injection, the lower side of the clamping ring (24) abuts against the upper end of the wedge block (233).

2. A lithium battery liquid injection vacuum packaging device according to claim 1, characterized in that: The negative pressure device (3) further comprises a detection assembly (32); a negative pressure flow channel (2311) is provided on the sealing seat (231); the negative pressure flow channel (2311) is located at the lower side of the slide groove (2316); a sealing detection cavity (2312) is provided in the middle section of the negative pressure flow channel (2311); the vacuum pump (31) and the negative pressure flow channel (2311) are connected by a pipeline; the detection assembly (32) comprises a transducer plate (321) and a coil (323); the transducer plate (321) and the sealing detection cavity ( The upper end of the transducer plate (321) is inserted into the negative pressure flow channel (2311), and a bias rod (322) is provided at the lower end of the transducer plate (321). One end of the bias rod (322) abuts against the transducer plate (321), and the bias rod (322) and the sealed inspection cavity (2312) are slidably connected. The coil (323) is placed in the sealed inspection cavity (2312), and the bias rod (322) is made of a magnetic material. The axis of the bias rod (322) coincides with the axis of the coil (323).

3. A lithium battery liquid injection vacuum packaging device according to claim 2, characterized in that: An enrichment chamber (2314) is provided at one end of the negative pressure flow channel (2311) away from the working chamber (2315); the vacuum pump (31) is connected to the middle of the upper end of the enrichment chamber (2314); the detection component (32) further comprises an enrichment block (325); the enrichment block (325) is in the shape of an inverted water drop; the enrichment block (325) is placed in the enrichment chamber (2314); the enrichment chamber (2314) and the enrichment block (325) are adapted to each other; and the curvature of the side of the enrichment block (325) is arranged to increase from bottom to top.

4. A lithium battery liquid injection vacuum packaging device according to claim 3, characterized in that: The detection component (32) further comprises two electrode plates (324), a moisture measuring channel (2313) is provided on the upper side of the enrichment chamber (2314), the two electrode plates (324) are placed on the walls on both sides of the moisture measuring channel (2313), and the two electrode plates (324) are electrically connected to two wiring terminals of a power supply, respectively.

5. A lithium battery liquid injection vacuum packaging device according to claim 4, characterized in that: The humidity measuring flow channel (2313) is annular in shape, and converges upwards; the electrode plate (324) is located at the convergence section of the humidity measuring flow channel (2313).

6. A lithium battery liquid injection vacuum packaging device according to claim 2, characterized in that: The rotation axis of the energy conversion plate (321) is located on the upper side of the horizontal center plane.

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