Battery cell liquid injection production line

Abstract

The invention relates to the technical field of lithium battery production, in particular to a battery cell liquid injection production line which comprises a battery cell feeding and detecting device, a liquid injection device, a liquid injection device, a liquid injection device and a liquid injection device, and is characterized in that the battery cell feeding and detecting device is used for feeding battery cells and removing unqualified battery cells; the flaring mechanism is used for flaring the battery cell; the liquid injection mechanism is used for injecting liquid into the battery cell; the vacuum packaging device is used for carrying out vacuumizing treatment and packaging treatment on the battery cell after liquid injection; the primary battery cell liquid injection weighing device is used for detecting the weight of the battery cell before liquid injection; the secondary battery cell liquid injection weighing device is used for detecting the weight of the battery cell after liquid injection; the battery cell tray loading and unloading device is used for carrying out tray loading and unloading treatment on the packaged battery cells; and the conveying device is used for sequentially conveying the battery cells from the battery cell feeding and detecting device to the primary battery cell liquid injection and weighing device, the flaring mechanism, the liquid injection mechanism, the vacuum packaging device, the secondary battery cell liquid injection and weighing device and the battery cell tray loading and discharging device. The liquid injection production line has the effect of improving the automation degree and the production efficiency of the liquid injection production line.

Description

Technical Field

[0001] The invention relates to the technical field of lithium battery production, and in particular to a battery cell liquid injection production line. Background Art

[0002] Lithium battery is a kind of battery with chemical properties. Specifically, it is a battery with lithium metal or lithium alloy as negative electrode material and non-aqueous electrolyte solution. The electrolyte of lithium battery is the carrier of ion transmission in the battery. The electrolyte plays the role of conducting electrons between the positive and negative electrodes of lithium battery, which is the guarantee for lithium-ion battery to obtain advantages such as high voltage and high specific energy. The lithium battery injection process is the key process in the lithium battery manufacturing process. The quality of the injection process directly affects the quality and service life of lithium battery. In the prior art, a battery cell filling production line usually includes processes such as flaring, filling, and vacuum packaging. However, most of the processes in the battery cell filling production lines currently on the market need to be carried out independently, and manual intervention is required between each process, which places high demands on operators, resulting in instability and a low degree of automation, making it impossible to ensure the quality of lithium battery products, and at the same time, the production efficiency is low. How to develop a fully automatic battery cell filling production line that automatically integrates each process to improve the production efficiency of lithium batteries has become a technical problem that company R&D personnel urgently need to solve. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, the present application provides a battery cell liquid injection production line.

[0004] The above invention objectives of the present application are achieved through the following technical solutions: A battery cell loading and detection device, which loads the battery cells and removes unqualified battery cells; An expansion mechanism, which is used to expand the battery cell; A liquid injection mechanism, which is used to inject liquid into the battery cell; A vacuum packaging device, which performs vacuum processing and packaging processing on the battery cell after liquid injection; A primary cell injection weighing device, which detects the weight of the cell before injection; A secondary battery cell injection weighing device, which detects the weight of the battery cell after injection; A cell tray loading and unloading device is used to load and unload the packaged cells; A conveying device conveys the battery cells from the battery cell loading and detection device in sequence to the primary battery cell liquid injection and weighing device, the flaring mechanism, the liquid injection mechanism, the vacuum packaging device, the secondary battery cell liquid injection and weighing device and the battery cell tray loading and unloading device.

[0005] By adopting the above technical scheme, under the action of the battery cell feeding detection device, the battery cells can be detected and unqualified battery cells can be screened out and removed while the battery cell feeding is completed, thereby improving the production quality of lithium batteries. Subsequently, a primary battery cell liquid injection weighing device is used to weigh the battery cells before liquid injection, and then the battery cells are expanded by the expansion mechanism, and the expanded battery cells are injected with liquid by the injection mechanism. The vacuum packaging device performs vacuum processing and packaging processing on the battery cells after liquid injection, and effectively removes gas and impurities inside the battery cells under vacuum conditions. Subsequently, the secondary battery cells are weighed before liquid injection. The secondary cell liquid filling and weighing device weighs the packaged cell after liquid filling to check the injection quality in time. Finally, the cell loading and unloading device performs automatic loading and unloading processes on the cell to complete the entire lithium battery production. By setting up a conveying device, the various processes such as cell loading detection, primary weighing, flaring, liquid filling, vacuum packaging, and secondary weighing can be integrated to form a seamless cell liquid filling production line, thereby improving the degree of automation and production efficiency of the liquid filling production line, reducing dependence on manual labor, and ensuring the quality and consistency of lithium battery products.

[0006] In a preferred example, the present application can be further configured as follows: the battery cell feeding detection device includes a feeding conveyor belt, and the feeding conveyor belt is provided with a plurality of station areas for placing battery cells along the conveying direction; A detection device, which is arranged on the feeding side of the feeding conveyor belt and is used to detect the battery cells on each of the workstation areas one by one and record the information of the workstation area where the unqualified battery cells are located; A defective collection mechanism, which is controllably connected to the detection device and is used to transfer defective cells out of the feeding conveyor belt; A battery cell replenishing mechanism is controlled and connected to the detection device. After the defective collection mechanism transfers the unqualified battery cells out of the loading conveyor belt, the battery cell replenishing mechanism is used to continuously transfer the battery cells that have passed the previous inspection to the workstation area where the unqualified battery cells are located.

[0007] By adopting the above technical scheme, during operation, the loading conveyor belt continuously moves to drive the battery cells on each workstation area to be transported from the feed side to the discharge side. During this period, the detection equipment records the detection results of each battery cell, and marks the information of the unqualified battery cells and the workstation area where they are located. Then, the defective collection mechanism removes the unqualified battery cells from the loading conveyor belt according to the workstation area information marked by the detection equipment. Then, the battery cell supplement mechanism transfers the battery cells that have been previously tested and qualified on the loading conveyor belt to the workstation area vacant due to the removal of the unqualified battery cells according to the workstation area information marked by the detection equipment, so as to ensure that there are always qualified battery cells in the subsequent workstation area on the loading conveyor belt. The workstation area vacant after the battery cell supplement mechanism transfers the battery cells can continuously return to the feed side of the loading conveyor belt under the conveying action of the loading conveyor belt to wait for loading, so that the same number of qualified battery cells can always be output to the primary battery cell injection weighing device, so that the loading process is smoother, the production efficiency and production quality of lithium batteries are improved, and no manual intervention is required during operation, and the degree of automation is high.

[0008] In a preferred example, the present application can be further configured as follows: the defective collection mechanism includes a defective collection box, a first grabbing assembly and a first biaxial moving device, the defective collection box is open at the top and is arranged on one side of the feeding conveyor belt, the first grabbing assembly is connected to the first biaxial moving device and is used to grab defective battery cells on the feeding conveyor belt, the first biaxial moving device is used to drive the first grabbing assembly to move horizontally and vertically, the battery cell replenishing mechanism includes a second grabbing assembly and a second biaxial moving device, the second grabbing assembly is connected to the second biaxial moving device and is used to grab qualified battery cells on the feeding conveyor belt, and the second biaxial moving device is used to drive the second grabbing assembly to move horizontally and vertically.

[0009] By adopting the above technical solution, when unqualified battery cells are detected, the first biaxial moving device starts and drives the first grabbing component to move until the first grabbing component picks up the corresponding battery cells, and then moves to the top of the defective collection box and puts it into it, thereby completing the collection of unqualified battery cells. After the defective collection mechanism removes the unqualified battery cells, the second biaxial moving device starts and drives the second grabbing component to move to the qualified battery cells that are before the unqualified battery cells in sequence according to the records of the detection equipment, grabs the qualified battery cells and moves them to the vacant workstation area that needs to be supplemented, and then resets them to complete the supplement of the qualified battery cells.

[0010] In a preferred example, the present application can be further configured as follows: the primary battery cell liquid injection weighing device and the secondary battery cell liquid injection weighing device both include a weighing workbench, a plurality of weighing sensors are arranged on the weighing workbench, each of the weighing sensors is provided with a weighing seat for placing the battery cell, and the weighing sensor is used to detect the weight of the battery cell in the weighing seat.

[0011] By adopting the above technical solution, when the conveying device conveys the battery cell to the weighing seat, the weighing sensor can immediately detect the weight of the battery cell and feed back the data, which is convenient for the subsequent liquid injection process or tray loading and unloading process.

[0012] In a preferred example, the present application can be further configured as follows: the expansion mechanism includes a first pre-expansion component, an expansion base and an expansion piece, the first pre-expansion component is used to pre-expand the battery cell bag, the expansion piece is vertically slidably arranged on the expansion base, the size of the expansion piece gradually increases from bottom to top, the expansion base is vertically fixedly installed with a second electric cylinder, and the second electric cylinder is used to drive the expansion piece to slide vertically; The injection mechanism includes a second pre-expansion component, an injection machine base, an injection piece, a liquid storage tank, a first liquid pump and a third electric cylinder. The second pre-expansion component is used to grab the opposite sides of the battery bag of the battery cell to maintain the opening state of the battery bag of the battery cell. The injection piece is vertically slidably arranged on the injection machine base. The third electric cylinder is vertically installed on the injection machine base and is used to drive the injection piece to move vertically. The liquid storage tank is filled with electrolyte. The liquid storage tank and the first liquid pump are both arranged on one side of the injection machine base. One end of the first liquid pump is connected to the injection piece through an infusion tube and the other end is connected to the liquid storage tank through an infusion tube.

[0013] By adopting the above technical scheme, in the expansion mechanism, under the action of the first pre-expansion component, the battery bag of the battery cell can be pre-expanded, making preliminary preparations for the formal expansion operation of the subsequent expansion mechanism to play a guiding role and reduce the elastic resetting phenomenon of the battery bag after the formal expansion. After the battery bag completes the pre-expansion process, the expansion piece moves vertically under the action of the second electric cylinder until it enters the battery bag to complete the expansion process, and because the size of the expansion piece gradually increases from bottom to top, it is convenient for the expansion piece to enter the interior of the battery bag, and the damage to the battery can be reduced. The possibility of battery bag, after the expansion is completed, the battery cells are transported to the injection mechanism, in which the second pre-expansion component keeps the battery cell battery bag in an open state by grabbing the opposite sides of the battery cell battery bag to prevent the opening of the battery bag from shrinking due to elastic resetting. At the same time, the injection piece moves vertically under the action of the third electric cylinder until it enters the battery bag, and then starts the first liquid pump to pump the electrolyte in the liquid storage tank into the injection piece through the infusion tube, so that it enters the interior of the battery cell battery bag to complete the injection, so as to complete the precise and efficient injection process and reduce the risk of leakage.

[0014] In a preferred example, the present application can be further configured as follows: the first pre-expansion component and the second pre-expansion component each include two relative mounting seats and a pre-expansion drive component, the two mounting seats are horizontally slidably arranged on the expansion mechanism or the injection mechanism, each of the mounting seats is horizontally provided with a second suction cup, the second suction cup is connected to an external air pump, and when the battery cell is located between the two mounting seats, the two second suction cups are respectively used to abut against the opposite sides of the battery cell battery bag, and the pre-expansion drive assembly is used to drive the two relative mounting seats to move toward or away from each other.

[0015] By adopting the above technical scheme, when the battery cell moves to the expansion mechanism, the pre-expansion drive component is started to drive the two relative mounting seats to move toward each other, so that the second suction cups on the two mounting seats move close to the opposite sides of the battery cell battery bag until they abut, and then the external air pump is used to make the second suction cups generate a continuous adsorption force on the battery bag, and then the two mounting seats are driven to move away from each other by the pre-expansion drive component, and the battery bag is opened under the pull of the second suction cups on both sides, so as to realize the pre-expansion operation of the battery bag by the first pre-expansion component, and then the formal expansion of the battery bag is completed by the expansion mechanism; and when the battery cell moves to the injection mechanism, the pre-expansion drive component is started to drive the two relative mounting seats to move toward each other, so that the second suction cups on the two mounting seats move close to the opposite sides of the battery cell battery bag until they abut, and then the external air pump is used to make the second suction cups generate a continuous adsorption force on the battery bag, so that the battery cell battery bag always remains in the expanded state, which can avoid the leakage caused by the elastic resetting of the battery bag causing the opening to shrink during the injection process.

[0016] In a preferred example, the present application can be further configured as follows: the vacuum packaging device includes a primary vacuum pumping mechanism and a secondary vacuum pumping and sealing mechanism, the primary vacuum pumping mechanism is used to perform preliminary vacuum pumping treatment on the interior of the battery cell battery bag and place the battery cell in a vacuum environment for standing, and the secondary vacuum pumping and sealing mechanism is used to perform secondary vacuum pumping treatment and sealing treatment on the battery cell battery bag treated by the primary vacuum pumping mechanism in a vacuum environment.

[0017] By adopting the above technical scheme, in the primary vacuum pumping mechanism, the interior of the battery bag of the battery cell can be preliminarily vacuumed to remove most of the air and impurities inside the battery bag, and at the same time, the battery cell is placed in a vacuum environment for static treatment. During the static stage, the gas inside the battery cell is further discharged and the internal pressure is gradually stabilized, so as to prepare for the subsequent secondary vacuum pumping and sealing, ensure the quality of the subsequent sealing process, and at the same time improve the consistency of mass production of battery cells. After completing the primary vacuum pumping and static treatment, the battery cell is transported to the secondary vacuum pumping and sealing mechanism, in which the battery cell battery bag is subjected to secondary vacuum pumping to ensure that the battery cell battery bag is sealed after the vacuum degree inside the battery bag meets the standard to form a finished battery cell, wherein the secondary vacuum pumping and sealing mechanism performs secondary vacuum pumping on the battery cell battery bag, which can discharge excess gas impurities in the battery cell, and at the same time integrates the vacuum pumping process and the sealing process into the same mechanism, so that the battery cell can synchronously complete the sealing process in a vacuum environment, improve the integration of processes and equipment, and thus improve the production efficiency of lithium batteries.

[0018] In a preferred example, the present application can be further configured as follows: the secondary vacuum sealing mechanism includes a second vertically arranged mounting frame, a second vacuum cylinder and a second vacuum box, the second vacuum cylinder is vertically mounted on the second mounting frame, the top of the second vacuum box is fixedly connected to the piston rod of the second vacuum cylinder, there is a closed position on the moving path of the second vacuum box, when the second vacuum box is located in the closed position, and when the conveying device conveys the battery cell to the bottom of the second vacuum box, a closed cavity is formed between the second vacuum box and the conveying device, and the second vacuum box is provided with a second air extraction port The second air extraction port is connected to an external air pump, and a plurality of sealing modules are arranged inside the second vacuum box body corresponding to the number of battery cells. The sealing modules include a lifting cylinder, a lifting and hot-pressing linkage assembly, and two hot-pressing sealing blocks arranged opposite to each other. The lifting cylinder is vertically installed and passes through the top of the second vacuum cylinder. The two hot-pressing sealing blocks are both connected to the lifting cylinder and are provided with a heating element inside. The heating element is used to heat the hot-pressing sealing blocks. The lifting and hot-pressing linkage assembly is connected to the lifting cylinder and when the lifting cylinder drives the piston rod to drive the two hot-pressing sealing blocks to move downward or upward, the two hot-pressing sealing blocks are driven to move toward or away from each other.

[0019] By adopting the above technical scheme, the second vacuum cylinder drives the piston rod to drive the lifting of the second vacuum box to cooperate with the conveying device to form a closed cavity, so that the battery cell can be in a stable and controlled environment, which can further improve the accuracy and consistency of vacuuming, and then the external air pump further vacuumizes the closed cavity through the second vacuum port. After the second vacuum box forms a closed cavity and completes the secondary vacuuming process, the lifting cylinder drives the two oppositely arranged hot-pressing sealing blocks to move downward close to the battery cell battery bag on the workstation seat. At the same time, the lifting and hot-pressing linkage assembly drives the two hot-pressing sealing blocks to move toward each other until the two hot-pressing sealing blocks respectively abut against the opposite sides of the battery cell battery bag, and then the hot-pressing sealing blocks are heated by the heating element to complete the hot-pressing sealing operation of the battery cell battery bag. Among them, by setting the lifting and hot-pressing linkage assembly, the two relative hot-pressing sealing blocks can synchronously perform the dual-axis movement operation, which can improve the sealing efficiency of the battery cell battery bag.

[0020] In a preferred example, the present application can be further configured as follows: the lifting and hot pressing linkage assembly includes a lifting and moving frame and a connecting plate, the lifting and moving frame and the connecting plate are both fixedly connected to the piston rod of the lifting cylinder, the connecting plate is provided with two symmetrical and inclined second strip sliding holes, a second slider is slidingly arranged in the second strip sliding hole, the two hot pressing sealing blocks are respectively fixedly connected to the two second sliders and are both slidingly connected to the lifting and moving frame.

[0021] By adopting the above technical solution, when the lifting cylinder drives the piston rod to move downward, it will drive the lifting and moving frame and the connecting plate to move downward synchronously. At this time, the connecting plate abuts the second slider located in the second strip sliding hole. Since the second strip sliding hole is inclined, the second slider can synchronously generate horizontal displacement during the downward movement, so as to drive the hot-pressing sealing block fixedly connected thereto to synchronously generate horizontal displacement on the lifting and moving frame, thereby driving the hot-pressing sealing block to be lifted and moved horizontally synchronously, thereby improving the sealing efficiency of the battery cells.

[0022] In a preferred example, the present application can be further configured as follows: the battery cell loading and unloading device comprises an empty tray conveyor belt, a full tray conveyor belt, a tray switching mechanism and a battery cell stacking mechanism; a tray disassembling mechanism is provided on the feeding side of the empty tray conveyor belt, the tray disassembling mechanism is used to split the tray pile into individual trays and transfer the trays to the feeding side of the empty tray conveyor belt, the empty tray conveyor belt is used to convey the trays one by one to the tray switching mechanism, the tray switching mechanism is provided between the empty tray conveyor belt and the full tray conveyor belt and is used to transfer the trays from the empty tray conveyor belt to the feeding side of the full tray conveyor belt, the battery cell stacking mechanism is provided on the full tray conveyor belt and is used to stack the finished battery cells into the trays, a tray stacking mechanism is provided on the discharging side of the full tray conveyor belt, the tray stacking mechanism is used to stack the stacked trays to form a tray pile, and the full tray conveyor belt is used to convey the trays to the battery cell stacking mechanism and the tray stacking mechanism in sequence.

[0023] By adopting the above technical scheme, during operation, the empty trays are piled into the feed side of the empty tray conveyor belt, and the tray dismantling mechanism can split the empty tray pile into individual trays one by one, and transport them to the tray switching mechanism one by one through the empty tray conveyor belt. The tray switching mechanism is responsible for conveying the empty trays from the empty tray conveyor belt to the full tray conveyor belt, and conveying the empty trays to the battery cell stacking mechanism and the tray stacking mechanism in sequence through the full tray conveyor belt. During this period, the battery cell stacking mechanism is responsible for accurately stacking the processed battery cells from the conveying device into the empty tray, and the tray stacking mechanism is responsible for stacking the trays filled with battery cells. After the tray stack is formed, it is transported to the discharge side through the full tray conveyor belt to complete the discharge, wherein the tray dismantling process, tray loading process, stacking process and transfer process are integrated into one, the processes are smooth and efficient, no manual intervention is required in the middle, human errors are reduced, the neat arrangement of battery cells and trays is ensured, and the overall production efficiency of lithium batteries is improved.

[0024] In summary, the present application includes at least one of the following beneficial technical effects: 1. Under the action of the battery cell feeding detection device, the battery cells can be inspected and unqualified battery cells can be screened out and removed while the battery cell feeding is completed, so as to improve the production quality of lithium batteries. Then, the primary battery cell liquid injection weighing device is used to weigh the battery cells before liquid injection, and then the battery cells are expanded through the expansion mechanism, and the expanded battery cells are injected through the injection mechanism. The vacuum packaging device performs vacuum treatment and packaging treatment on the battery cells after liquid injection, and effectively removes the gas and impurities inside the battery cells under vacuum conditions. Then, the secondary battery cell liquid injection weighing device weighs the packaged battery cells after liquid injection to timely check the injection quality. Finally, the battery cells are automatically loaded and unloaded through the battery cell loading and unloading device, so as to complete the production of the entire lithium battery. By setting a conveying device, the various processes such as battery cell feeding detection, primary weighing, expansion, injection, vacuum packaging, and secondary weighing can be integrated to form a seamless battery cell liquid injection production line, improve the automation degree and production efficiency of the liquid injection production line, reduce dependence on manual labor, and ensure the quality and consistency of lithium battery products.

[0025] 2. When the battery cell is tested, the feeding conveyor belt moves continuously to drive the battery cells on each workstation area to be transported from the feed side to the discharge side. During this period, the testing equipment records the test results of each battery cell and marks the information of the unqualified battery cells and their workstation areas. Then, the defective collection mechanism removes the unqualified battery cells from the feeding conveyor belt according to the workstation area information marked by the testing equipment. Then, the battery cell supplement mechanism transfers the previously qualified battery cells on the feeding conveyor belt to the workstation area vacant due to the removal of the unqualified battery cells according to the workstation area information marked by the testing equipment, so as to ensure that there are always qualified battery cells in the subsequent workstation area on the feeding conveyor belt. The workstation area vacant after the battery cell supplement mechanism transfers the battery cells can be continuously returned to the feeding side of the feeding conveyor belt under the conveying action of the feeding conveyor belt to wait for loading, so that the same number of qualified battery cells can always be output to the primary battery cell injection weighing device, so that the feeding process is smoother, the production efficiency and production quality of lithium batteries are improved, and no manual intervention is required during operation, and the degree of automation is high.

[0026] 3. By setting up a weighing base that can place the battery cell vertically, the space occupied by traditional flat weighing can be reduced. In the same area, more battery cells can be accommodated for weighing to improve the weighing efficiency. In addition, by matching the vertical placement mechanism, the battery cell can be converted to a vertical state before the transfer mechanism comes to pick it up, that is, before the battery cell is weighed, so as to save the need for subsequent conversion before liquid injection, so that the battery cell always remains in a vertical state during the process from weighing to liquid injection, thereby simplifying the transfer process, improving the efficiency of battery production, and optimizing the layout and process of the production line.

[0027] 4. During the expansion and injection process, in the expansion mechanism, under the action of the first pre-expansion component, the battery bag of the battery cell can be pre-expanded, making preliminary preparations for the subsequent expansion operation of the expansion mechanism to play a guiding role and reduce the elastic reset phenomenon of the battery bag after the formal expansion. After the battery bag completes the pre-expansion process, the expansion piece moves vertically under the action of the second electric cylinder until it enters the battery bag to complete the expansion process. In addition, since the size of the expansion piece gradually increases from bottom to top, it is convenient for the expansion piece to enter the interior of the battery bag, and it can reduce the loss. In order to reduce the possibility of damaging the battery bag, after the expansion is completed, the battery cells are transported to the injection mechanism, in which the second pre-expansion component grasps the opposite sides of the battery cell bag to keep the battery cell bag in an open state, thereby preventing the opening of the battery bag from shrinking due to elastic resetting. At the same time, the injection piece moves vertically under the action of the third electric cylinder until it enters the battery bag, and then starts the first liquid pump to pump the electrolyte in the liquid storage tank into the injection piece through the infusion tube, thereby entering the battery cell bag to complete the injection, so as to complete the accurate and efficient injection process and reduce the risk of leakage.

[0028] 5. During the vacuum packaging process, in the primary vacuum pumping mechanism, the interior of the battery bag of the battery cell can be preliminarily vacuumed to remove most of the air and impurities inside the battery bag, and at the same time, the battery cell is placed in a vacuum environment for static. During the static stage, the gas inside the battery cell is further discharged and the internal pressure is gradually stabilized, so as to prepare for the subsequent secondary vacuum pumping and sealing, ensure the quality of the subsequent sealing process, and at the same time improve the consistency of mass production of battery cells. After completing the primary vacuum pumping and static, the battery cell is transported to the secondary vacuum pumping and sealing mechanism. In the secondary vacuum pumping and sealing mechanism, the battery cell battery bag is subjected to secondary vacuum pumping to ensure that the battery cell battery bag is sealed after the vacuum degree inside the battery bag meets the standard to form a finished battery cell. Among them, the secondary vacuum pumping and sealing mechanism performs secondary vacuum pumping on the battery cell battery bag, which can discharge excess gas impurities in the battery cell, and at the same time integrates the vacuum pumping process and the sealing process into the same mechanism, so that the battery cell can be sealed synchronously in a vacuum environment, improve the integration of processes and equipment, and thus improve the production efficiency of lithium batteries.

[0029] 6. When performing the tray loading and unloading process, the empty trays are piled into the feeding side of the empty tray conveyor belt. The tray disassembling mechanism can split the empty tray pile into individual trays one by one, and transport them to the tray switching mechanism one by one through the empty tray conveyor belt. The tray switching mechanism is responsible for conveying the empty trays from the empty tray conveyor belt to the full tray conveyor belt, and conveying the empty trays to the battery cell stacking mechanism and the tray stacking mechanism in sequence through the full tray conveyor belt. During this period, the battery cell stacking mechanism is responsible for accurately stacking the processed battery cells from the conveying device into the empty tray, and the tray stacking mechanism is responsible for stacking the trays filled with battery cells. After the tray pile is formed, it is transported to the discharge side through the full tray conveyor belt to complete the discharge. Among them, the tray disassembling process, tray loading process, stacking process and transfer process are integrated into one, and the processes are smooth and efficient. No manual intervention is required in the middle, which reduces human errors, ensures the neat arrangement of battery cells and trays, and improves the overall production efficiency of lithium batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of a battery cell injection production line in one embodiment of the present application; Figure 2 It is another overall structural schematic diagram of a battery cell injection production line in one embodiment of the present application; Figure 3 It is a structural schematic diagram of a battery cell feeding detection device in one embodiment of the present application; Figure 4 yes Figure 3 A partial enlarged schematic diagram of part A; Figure 5 yes Figure 3 A partial enlarged schematic diagram of part B; Figure 6 is a structural schematic diagram of a first alignment block and a first driving mechanism in an embodiment of the present application; Figure 7 is a structural schematic diagram of a second alignment block and a second driving mechanism in an embodiment of the present application; Figure 8 It is a structural schematic diagram of a primary cell liquid injection weighing device in one embodiment of the present application; Fig. 9 It is a schematic diagram of the assembly of a weighing base and a battery cell in a vertical state in one embodiment of the present application; Fig.10 This is a schematic diagram of the structure of the vertical placement mechanism in one embodiment of the present application; Fig.11 yes Figure 8 A partial enlarged schematic diagram of part C in the middle; Fig.12 It is a structural schematic diagram of the expansion mechanism and the liquid injection mechanism in one embodiment of the present application; Fig.13 is a structural schematic diagram of a flaring mechanism in one embodiment of the present application; Fig.14 is another structural schematic diagram of the expansion mechanism in one embodiment of the present application; Fig.15 It is a structural schematic diagram of a liquid injection mechanism in one embodiment of the present application; Fig.16 is a schematic structural diagram of a vacuum packaging device in one embodiment of the present application; Fig.17 This is a structural schematic diagram of a primary vacuum pumping mechanism in an embodiment of the present application; Fig.18 This is a schematic diagram of the overall structure of the secondary vacuum sealing mechanism in one embodiment of the present application; Fig.19 This is a schematic diagram of the structure of the secondary vacuum sealing mechanism in one embodiment of the present application after the second vacuum box is removed; Fig. 20 This is a schematic structural diagram of a sealing module in one embodiment of the present application; Fig.21 It is a schematic diagram of the overall structure of a battery cell tray loading and unloading device in one embodiment of the present application; Fig. 22 It is another overall structural schematic diagram of the battery cell tray loading and unloading device in one embodiment of the present application; Fig.23 yes Fig. 22 A partial enlarged schematic diagram of part D in the middle.

[0031] Reference numerals: 1. battery cell loading and detection device; 2. vacuum packaging device; 3. primary battery cell injection and weighing device; 4. secondary battery cell injection and weighing device; 5. battery cell tray unloading device; 6. first transfer mechanism; 7. annular track module; 8. second transfer mechanism; 9. flat placement mechanism; 10. unloading conveyor belt; A1, feeding conveyor belt; A2, workstation area; A21, baffle; A22, alignment plate; A3, testing equipment; A4, defective collection mechanism; A41, defective collection box; A42, first grabbing assembly; A43, first biaxial moving device; A5, battery cell replenishing mechanism; A51, second grabbing assembly; A52, second biaxial moving device; A6, alignment mechanism; A61, first alignment block; A62, second alignment block; A63, first driving mechanism; A64, second driving mechanism; A7, infrared sensor; B2, vertical mechanism; B21, vertical lifting plate; B22, first drive assembly; B23, vertical rotating shaft; B24, vertical mounting plate; B25, first suction cup; B26, second drive assembly; B261, transmission gear; B262, transmission rack; B3, weighing workbench; B4, transfer mechanism; B41, transfer workbench; B42, double-axis moving module; B421, linear module; B422, transfer mounting plate; B423, guide rail; B43, pneumatic finger; B5, weighing sensor; B6, weighing seat; B61, bottom plate; B62, support plate; B63, end plate; B64, side sealing groove; B65, pole ear groove; C1, working plate; C2, expansion mechanism; C21, expansion base; C22, expansion parts; C23, second electric cylinder; C3, injection mechanism; C31, injection base; C32, injection parts; C33, liquid storage tank; C34, third electric cylinder; C35, buffer replenishment tank; C36, collection box; C37, moving plate; C38, second cylinder; C5, work station; C6, first pre-expansion assembly; C61, mounting seat; C62, pre-expansion drive assembly; C63, connecting piece; C64, first strip sliding hole; C65, second slider; C66, first electric cylinder; C67, second suction cup; C7, second pre-expansion assembly; C8, lifting plate; C9, first cylinder; D2, primary vacuum pumping mechanism; D21, first mounting frame; D22, first vacuum pumping cylinder; D23, first vacuum pumping box; D24, first vacuum pumping port; D3, secondary vacuum pumping and sealing mechanism; D31, second mounting frame; D32, second vacuum pumping cylinder; D33, second vacuum pumping box; D34, second vacuum pumping port; D35, sealing module; D351, lifting cylinder; D352, lifting and hot pressing linkage assembly; D3521, lifting and moving frame; D3522, connecting plate; D3523, second strip sliding hole; D3524, second slider; D353, hot pressing sealing block; D6, guide rail; E1, empty tray conveyor belt; E2, full tray conveyor belt; E3, tray switching mechanism; E31, dual-axis moving module; E311, linear module; E312, transfer frame; E313, tray switching cylinder; E32, clamping assembly; E321, clamping mounting plate; E322, push clamping cylinder; E323, third L-shaped clamping plate; E4, battery cell stacking mechanism; E5, tray disassembly mechanism; E51, first horizontal support assembly; E511, first horizontal cylinder; E512, first L-shaped clamping plate; E52, first vertical support assembly; E5 21. First vertical cylinder; E522. First vertical supporting plate; E53. First material-blocking assembly; E531. Limiting L-shaped member; E532. Limiting opening; E6. Pallet stacking mechanism; E61. Second horizontal supporting assembly; E611. Second horizontal cylinder; E612. Second L-shaped clamping plate; E62. Second vertical supporting assembly; E621. Second vertical cylinder; E622. Second vertical supporting plate; E63. Second material-blocking assembly; E631. Material-blocking cylinder; E632. Discharging baffle; E7. Third vertical cylinder; E8. Stacking baffle. DETAILED DESCRIPTION

[0032] The following is a description of exemplary embodiments of the present application in conjunction with the accompanying drawings, including various details of the embodiments of the present application to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present application. Similarly, for the sake of clarity and conciseness, the description of well-known functions and structures is omitted in the following description.

[0033] It should be noted that the terms "first", "second", etc. in the present invention are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present disclosure described herein can be implemented in an order other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure.

[0034] In addition, the term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article, unless otherwise specified, generally means that the associated objects before and after are in an "or" relationship.

[0035] A battery cell liquid injection production line of the present application is described below with reference to the accompanying drawings.

[0036] like Figure 1 and Figure 2As shown, the battery cell injection production line includes a battery cell feeding detection device 1, a flaring mechanism C2, an injection mechanism C3, a vacuum packaging device 2, a primary battery cell injection weighing device 3, a secondary battery cell injection weighing device 4, a battery cell tray unloading device 5 and a conveying device, wherein the battery cell feeding detection device 1 feeds the battery cells and removes unqualified battery cells, the flaring mechanism C2 flares the battery cells, the injection mechanism C3 injects liquid into the battery cells, and the vacuum packaging device 2 performs vacuum treatment and packaging treatment on the battery cells after liquid injection. The primary cell liquid injection weighing device 3 detects the weight of the cell before liquid injection, the secondary cell liquid injection weighing device 4 detects the weight of the cell after liquid injection, the cell tray loading and unloading device 5 performs tray loading and unloading processing on the packaged cell, and the conveying device sequentially conveys the cell from the cell loading and detection device 1 to the primary cell liquid injection weighing device 3, the flaring mechanism C2, the liquid injection mechanism C3, the vacuum packaging device 2, the secondary cell liquid injection weighing device 4 and the cell tray loading and unloading device 5. When working, under the action of the cell loading and detection device 1, the cell can be completely While the finished battery cells are being loaded, the battery cells are inspected and unqualified battery cells are screened out and removed, thereby improving the production quality of the lithium battery. Subsequently, the primary battery cell liquid injection weighing device 3 is used to weigh the battery cells before liquid injection, and then the battery cells are expanded through the expansion mechanism C2, and the expanded battery cells are injected with liquid through the injection mechanism C3. The vacuum packaging device 2 performs vacuum treatment and packaging treatment on the battery cells after liquid injection, and effectively removes the gas and impurities inside the battery cells under vacuum conditions. Subsequently, the secondary battery cell liquid injection weighing device 4 weighs the packaged battery cells after liquid injection to timely check the injection quality. Finally, the battery cells are automatically loaded and unloaded through the battery cell loading and unloading device 5 to complete the entire lithium battery production. By setting a conveying device, the various processes such as battery cell loading and detection, primary weighing, expansion, injection, vacuum packaging, and secondary weighing can be integrated to form a seamless battery cell liquid injection production line, improve the automation level and production efficiency of the liquid injection production line, reduce dependence on manual labor, and ensure the quality and consistency of lithium battery products.

[0037] In this embodiment, the conveying device includes a vertical placement mechanism B2, a first transfer mechanism 6, a circular track module 7, a second transfer mechanism 8, a horizontal placement mechanism 9 and a material unloading conveyor belt 10 which are sequentially arranged along the conveying path. The vertical placement mechanism B2 is arranged at the discharge side of the battery cell feeding detection device 1 and is used to convert the battery cells in a horizontal state to a vertical state. The first transfer mechanism 6 is arranged at the primary battery cell injection weighing device 3. The first transfer mechanism 6 is used to transport the battery cells picked up by the vertical placement mechanism to the primary battery cell injection weighing device 3, and transport the battery cells weighed once from the primary battery cell injection weighing device 3 to the circular track module 7. A plurality of working plates C1 are slidably mounted on the circular track module 7. A plurality of workstations C5 for vertically placing power cells are provided on the working plate C1, the annular track module 7 is used to drive the plurality of working plates C1 to drive the plurality of power cells to be transported to the expanding mechanism C2, the liquid injection mechanism C3 and the vacuum packaging device 2 in sequence, the second transfer mechanism 8 is provided on the secondary battery cell liquid injection and weighing device 4, the second transfer mechanism 8 is used to transport the battery cells that have completed the packaging process by the vacuum packaging device 2 to the flat laying mechanism 9, the flat laying mechanism 9 is provided on the feeding side of the unloading conveyor belt 10 and is used to lay the battery cells picked up by the second transfer mechanism 8 flatly on the unloading conveyor belt 10, the unloading conveyor belt 10 is used to transport the battery cells to the battery cell tray unloading device 5, in preparation for tray unloading processing.

[0038] Preferably, if Figure 3 As shown, the battery cell feeding detection device 1 includes a feeding conveyor belt A1, a plurality of workstation areas A2 for placing battery cells arranged along the conveying direction of the feeding conveyor belt A1, and a detection device A3, a defective collection mechanism A4 and a battery cell supplement mechanism A5 are sequentially arranged along the conveying direction of the feeding conveyor belt A1, the detection device A3 is arranged on the feeding side of the feeding conveyor belt A1 and is used to detect the battery cells on each workstation area A2 one by one and record the information of the workstation area A2 where the unqualified battery cells are located, the defective collection mechanism A4 is control-connected to the detection device A3 and is used to transfer the unqualified battery cells out of the feeding conveyor belt A1, the battery cell supplement mechanism A5 is control-connected to the detection device A3, and after the defective collection mechanism A4 transfers the unqualified battery cells out of the feeding conveyor belt A1, the battery cell supplement mechanism A5 is used to continuously transfer the battery cells that have been previously tested and qualified to the workstation area A2 where the unqualified battery cells are located; Among them, Figure 3 and Figure 8As shown, the vertical placement mechanism B2 and the first transfer mechanism 6 in the above-mentioned conveying device are arranged between the battery cell feeding detection device 1 and the primary battery cell injection weighing device 3. The vertical placement mechanism B2 and the first transfer mechanism 6 cooperate with each other to simultaneously output the battery cells on a plurality of continuous workstation areas A2. When working, the feeding conveyor belt A1 continuously moves to drive the battery cells on each workstation area A2 to be transported from the feeding side to the discharging side. During this period, the detection device A3 records the detection result of each battery cell, and marks the information of the unqualified battery cell and the workstation area A2 where it is located. Then, the defective collection mechanism A4 removes the unqualified battery cell from the feeding conveyor belt A1 according to the workstation area A2 information marked by the detection device A3, and then the battery cell replenishing machine According to the information of the work area A2 marked by the detection equipment A3, the structure A5 transfers the battery cells that have been previously tested and qualified on the feeding conveyor belt A1 to the work area A2 that has been vacant due to the removal of unqualified battery cells, so as to ensure that there are always qualified battery cells in the subsequent work area A2 on the feeding conveyor belt A1. The work area A2 that has been vacant after the battery cells are transferred by the battery cell replenishment mechanism A5 can be continuously returned to the feeding side of the feeding conveyor belt A1 to wait for loading under the conveying action of the feeding conveyor belt A1, so that the vertical placement mechanism B2 and the first transfer mechanism 6 can always output the same number of qualified battery cells, making the loading process smoother, improving the production efficiency and production quality of lithium batteries, and no manual intervention is required during operation, with a high degree of automation.

[0039] Specifically, Fig.10As shown, the vertical mechanism B2 includes a vertical lifting plate B21 and a first driving component B22 for driving the vertical lifting plate B21 to move vertically, wherein the first driving component B22 can be selected as a linear driving device such as a cylinder or an electric cylinder, and is not limited here. The vertical lifting plate B21 is rotatably provided with a vertical rotating shaft B23, and a plurality of vertical mounting plates B24 are axially arranged on the vertical rotating shaft B23. A first suction cup B25 is provided on the vertical mounting plate B24, and the first suction cup B25 is connected to an external air pump (not shown in the figure) and is used to abut against the battery cell. The vertical lifting plate B21 is provided with a second driving component B26 for driving the vertical rotating shaft B23 to rotate. When working, the second driving component B26 first drives the vertical rotating shaft B23 to drive the vertical mounting plate B24 to rotate, so as to drive the first suction cup B25 to rotate. 25 rotates to the top of the loading conveyor belt A1. After the loading conveyor belt A1 transports the battery cells to the vertical placement mechanism B2, the first driving component B22 drives the vertical placement lifting plate B21 to move vertically, so as to drive the first suction cup B25 to descend to the battery cells until it abuts against the battery cells. At this time, the external air pump is started to form a negative pressure on the first suction cup B25 to adsorb the battery cells, completing the picking operation. Subsequently, the first driving component B22 is started to drive the vertical placement lifting plate B21 to rise vertically, so that the battery cells rise together with the vertical placement lifting plate B21 and leave the original position until they rise to a certain height. Then, the second driving component B26 is started to drive the vertical placement rotating shaft B23 to rotate, driving the battery cells to gradually change from a horizontal state to a vertical state and wait for the handover of the first transfer mechanism 6, thereby realizing the process of the battery cells changing from a flat state to a vertical state.

[0040] Among them, the second driving component B26 includes a transmission gear B261, a transmission rack B262 and a cylinder. The transmission gear B261 is coaxially fixedly connected to the vertical rotating shaft B23. The end of the transmission rack B262 is fixedly connected to the piston rod of the cylinder and meshed with the transmission gear B261. The cylinder is installed on the vertical lifting plate B21. When the battery cell needs to be rotated, the cylinder drives the piston rod to drive the transmission rack B262 to move linearly. At the same time, under the meshing action of the transmission rack B262 and the transmission gear B261, the transmission gear B261 drives the vertical rotating shaft B23 to rotate, thereby realizing the rotation of the battery cell. Among them, through the precise meshing of the transmission rack B262 and the transmission gear B261, the accuracy of the battery cell rotation can be improved, providing guarantee for the subsequent transfer and weighing processes.

[0041] like Figure 8As shown, the first transfer mechanism 6 includes a transfer work frame B41, a double-axis moving module B42 and a pneumatic finger B43. The double-axis moving module B42 is installed on the transfer work frame B41, and the pneumatic finger B43 is vertically installed on the double-axis moving module B42. The double-axis moving module B42 is used to drive the pneumatic finger B43 to perform vertical and lateral displacements between the vertical placement mechanism B2, the weighing seat B6 and the injection mechanism C3. The pneumatic finger B43 is used to grab the battery cell in the vertical state. When the battery cell completes the transition to the vertical state under the action of the vertical placement mechanism B2, the double-axis moving module B4 2 drives the pneumatic finger B43 to move horizontally to the top of the battery cell first, and then moves vertically to make the pneumatic finger B43 clamp the battery cell in the vertical state, and continue to move it to the corresponding weighing seat B6 on the weighing workbench B3 under the action of the dual-axis moving module B42. After completing the weighing process, the battery cell in the vertical state is clamped and transported to the injection mechanism C3 to complete the subsequent injection process. Among them, the pneumatic finger B43 is used as a clamping tool, which can facilitate the clamping of the battery bag side sealing edge of the battery cell to reduce damage to the battery cell and adapt to the working condition of the battery cell in the vertical state.

[0042] It should be noted that the structure and working principle of the horizontal placement mechanism 9 are the same as those of the vertical placement mechanism, and the structure and working principle of the second transfer mechanism 8 are the same as those of the first transfer mechanism 6 .

[0043] Specifically, the above-mentioned dual-axis movable module B42 includes a linear module B421, a cylinder and a transfer mounting plate B422. The linear module B421 is installed on one side of the transfer workbench B41, and a guide rail B423 is arranged on the other side of the transfer workbench B41. The transfer mounting plate B422 is slidably arranged between the linear module B421 and the guide rail B423. The cylinder is vertically installed on the transfer mounting plate B422, so that the linear module B421 can drive the cylinder to perform lateral displacement. At the same time, the guide rail B423 can provide guidance for the transfer mounting plate B422 and improve the sliding stability. The pneumatic finger B43 is fixedly connected to the piston rod of the cylinder, so that the cylinder can drive the pneumatic finger B43 to vertically displace, thereby realizing the dual-axis movement of the pneumatic finger B43.

[0044] It should also be noted that if Figure 3 As shown, in this embodiment, the detection equipment A3 includes a CCD detection mechanism and a code scanning mechanism. The CCD detection mechanism is used to detect the outer surface of the battery cell, and the code scanning mechanism is used to scan and identify the battery cell. The two can be used together to detect the battery cells on each workstation area A2 one by one and record the information of the workstation area A2 where the unqualified battery cells are located. Both the CCD detection mechanism and the code scanning mechanism can adopt commonly used equipment on the market, which will not be elaborated here.

[0045] Specifically, refer to Figures 3 to 7The defective collection mechanism A4 includes a defective collection box A41, a first grabbing component A42 and a first biaxial moving device A43. The defective collection box A41 has an opening at the top and is arranged on one side of the feeding conveyor belt A1. The first grabbing component A42 is connected to the first biaxial moving device A43 and is used to grab the defective battery cells on the feeding conveyor belt A1. The first biaxial moving device A43 is used to drive the first grabbing component A42 to move horizontally and vertically. When an unqualified battery cell is detected, the first biaxial moving device A43 starts and drives the first grabbing component A42 to move until the first grabbing component A42 picks up the corresponding battery cell, and then moves to the top of the defective collection box A41 and puts it into it, thereby completing the collection of the defective battery cells.

[0046] The battery cell replenishment mechanism A5 includes a second grabbing component A51 and a second biaxial moving device A52. The second grabbing component A51 is connected to the second biaxial moving device A52 and is used to grab qualified battery cells on the feeding conveyor belt A1. The second biaxial moving device A52 is used to drive the second grabbing component A51 to move horizontally and vertically. After the defective collection mechanism A4 removes the unqualified battery cells, the second biaxial moving device A52 starts and drives the second grabbing component A51 to move to the qualified battery cells that are before the unqualified battery cells in sequence according to the records of the detection equipment A3, grabs the qualified battery cells and moves them to the vacant workstation area A2 that needs to be replenished, and then resets them to complete the replenishment of the qualified battery cells.

[0047] It should be noted that the first biaxial moving device A43 and the second biaxial moving device A52 in the above-mentioned embodiment both include a linear module and a cylinder, and the cylinder is slidably installed on the linear module so that the linear module can drive the cylinder to perform lateral displacement, and drive the first grasping component A42 or the second grasping component A51 to perform vertical displacement by driving the piston rod through the cylinder, thereby realizing the biaxial displacement of the first grasping component A42 or the second grasping component A51, and both the linear module and the cylinder can adopt common equipment on the market; the first grasping component A42 and the second grasping component A51 both include a second suction cup and an air pump (not shown in the figure), and the second suction cup is connected to the air pump, moved to the top of the battery cell and abutted against the battery cell for adsorption, thereby completing the grasping process of the battery cell.

[0048] In addition, a baffle A21 is provided on one side of the loading conveyor belt A1 along the conveying direction, and a plurality of alignment plates A22 are arranged on the loading conveyor belt A1 along the conveying direction. The length direction of each alignment plate A22 is perpendicular to the length direction of the baffle A21, and a plurality of work station areas A2 are formed between the alignment plates A22 and the baffle A21. A plurality of work station areas A2 for abutting and aligning the power cells are formed between the baffle A21 and the alignment plates A22, which facilitates the abutment and alignment of the power cells when they are loaded at the feed side of the loading conveyor belt A1, thereby improving the consistency of the power cell transportation.

[0049] Furthermore, an alignment mechanism A6 is provided on both the feed side and the discharge side of the loading conveyor belt A1. The alignment mechanism A6 is used to abut the battery cells in the work station area A2 against the alignment plate A22 and the baffle A21 respectively to align the battery cells. By arranging the alignment mechanism A6 on the feed side of the loading conveyor belt A1, it is convenient for the detection equipment A3 to accurately detect the battery cells and the defective collection mechanism A4 to transfer unqualified battery cells. The alignment mechanism A6 is arranged on the discharge side of the loading conveyor belt A1, so that the battery cell replenishment mechanism A5 can realign the qualified battery cells in time after replenishing the qualified battery cells and the output mechanism can accurately output the qualified battery cells.

[0050] Specifically, the alignment mechanism A6 includes a first alignment block A61 and a second alignment block A62. The first alignment block A61 is slidably arranged on the feeding conveyor belt A1 along the conveying direction of the feeding conveyor belt A1 and is located between any two adjacent alignment plates A22. The feeding conveyor belt A1 is provided with a first driving mechanism A63. When the battery cell is located between two adjacent alignment plates A22, the first driving mechanism A63 is used to drive the first alignment block A61 to slide so as to abut the battery cell against one of the alignment plates A22. The second alignment plate A22 is slidably arranged on the feeding conveyor belt A1 along the width direction of the feeding conveyor belt A1. The feeding conveyor belt A1 A second driving mechanism A64 is provided. When the first alignment block A61 abuts the battery cell against one of the alignment plates A22, the second driving mechanism A64 is used to drive the second alignment block A62 to abut the battery cell against the baffle A21. When the battery cell is located between the two alignment plates A22, the first driving mechanism A63 is started to drive the first alignment block A61 to slide and abut the battery cell to the alignment plate A22 to complete the preliminary alignment of one side of the battery cell. Then, the second driving mechanism A64 is started to drive the second alignment block A62 to slide and abut the battery cell to the baffle A21 to complete the alignment process of the battery cell, thereby realizing precise positioning of the battery cell.

[0051] It should be noted that the first drive mechanism A63 and the second drive mechanism A64 in the above embodiment both include a screw motor and a cylinder. With the cooperation of the screw motor and the cylinder, the first alignment block A61 or the second alignment block A62 can realize biaxial movement, that is, during the battery cell transportation process, the first alignment block A61 or the second alignment block A62 can make way by vertical movement. When the battery cells need to be aligned, they can be moved vertically until they are in the same horizontal plane as the battery cells, and then moved horizontally to abut the battery cells to the alignment plate A22 to complete the preliminary alignment. The screw motor and the cylinder can both adopt commonly used models on the market, which will not be elaborated here.

[0052] In addition, in one embodiment, an infrared sensor A7 is provided on the loading conveyor belt A1 corresponding to each work station area A2. The infrared sensor A7, the loading conveyor belt A1, the detection device A3 and the battery cell replenishment mechanism A5 are all controlled and connected. The infrared sensor A7 is used to detect the battery cells in the work station area A2. By providing the infrared sensor A7, it can cooperate with the battery cell replenishment mechanism A5 to detect the position of the work station area A2 where battery cells need to be replenished.

[0053] Preferably, if Figure 8 and Fig. 9 As shown, the primary battery cell liquid injection weighing device 3 and the secondary battery cell liquid injection weighing device 4 both include a weighing workbench B3, on which a number of weighing sensors B5 are arranged, and each weighing sensor B5 is provided with a weighing seat B6 for vertically placing the battery cell, and the weighing sensor B5 is used to detect the weight of the battery cell in the weighing seat B6, wherein, during operation, the feeding conveyor belt A1 is responsible for conveying the battery cell from the front-end production line to the vertical placement mechanism B2, and after the vertical placement mechanism B2 picks up the battery cell and transforms it from a flat state to a vertical state, the first transfer mechanism 6 conveys the battery cell in the vertical state to the corresponding weighing seat B6 on the weighing workbench B3, and at this time, the corresponding weighing sensor B5 immediately detects the weight of the battery cell and The data is fed back, and then the first transfer mechanism 6 transports the battery cells in the upright state to the injection mechanism C3 for the subsequent injection process, wherein a weighing seat B6 capable of placing the battery cells upright is provided to reduce the space occupied by the traditional flat weighing. More battery cells can be accommodated for weighing under the same area to improve the weighing efficiency, and by matching the upright mechanism B2, the battery cells can be converted to the upright state before the first transfer mechanism 6 comes to pick them up, that is, before they are weighed, to save the need for conversion before the subsequent injection, so that the battery cells can always remain in the upright state during the process from weighing to injection, thereby simplifying the transfer process, improving the efficiency of battery production, and playing a role in optimizing the layout and process of the production line.

[0054] It should be noted that the weighing sensor B5 is a device that converts a mass signal into a measurable electrical signal output. It can convert the gravity acting on the object to be measured into a measurable output signal at a certain ratio, thereby realizing accurate measurement of the mass of the object. In this embodiment, it is matched with a weighing stand B6 that can place the battery cell vertically. The weight of the weighing stand B6 with the battery cell is measured to obtain the weight of the battery cell. The structure and implementation principle of the weighing sensor B5 are common knowledge to technicians in this field and will not be elaborated here.

[0055] Specifically, Fig. 9As shown, the weighing seat B6 includes a bottom plate B61, a plurality of support plates B62 are symmetrically arranged on opposite sides of the bottom plate B61, and end plates B63 are arranged at opposite ends of the bottom plate B61. A weighing slot for vertically placing the battery cell is formed between the bottom plate B61, the support plates B62 and the end plates B63. The bottom plate B61 is vertically provided with a side sealing groove B64, and the side sealing groove B64 is used to accommodate the side sealing edge of the battery cell. The end plate B63 is vertically provided with a pole ear groove B65. When the side sealing edge of the battery cell is located in the side sealing groove B64, the pole ear of the battery cell is aligned with the pole ear groove B65. The bottom plate B61 serves as the basic supporting part of the weighing stand B6, and plays the role of transferring the weight of the battery cell. The symmetrically arranged support plate B62 is used to support the side walls of the battery cell, and together with the end plate B63, a complete weighing slot is formed. The weighing slot formed by the three can provide a vertical position for the battery cell, and through the setting of the side sealing slot B64 and the pole ear slot B65, it can provide space for the side sealing edge and the pole ear of the battery cell, while avoiding unnecessary pressure and damage to the battery cell during the weighing process, thereby enhancing the protection of the battery cell.

[0056] Furthermore, several pallets B62 are tilted on the bottom plate B61 so that the width of the weighing slot gradually decreases from the outside to the inside, wherein the symmetrically and tilted pallets B62 form a funnel-shaped slot structure, which helps the first transfer mechanism 6 to automatically center when picking up the battery cells and placing them into the weighing slot, thereby facilitating the adjustment of the position of the battery cells, improving production efficiency, and facilitating the removal of the battery cells.

[0057] In addition, refer to Figures 12 to 15The expansion mechanism C2 includes a first pre-expansion component C6, an expansion base C21 and an expansion piece C22. The expansion piece C22 is vertically slidably arranged on the expansion base C21. The first pre-expansion component C6 is used to pre-expand the battery bag. The size of the expansion piece C22 increases gradually from bottom to top. The expansion base C21 is vertically fixed with a second electric cylinder C23. The second electric cylinder C23 is used to drive the expansion piece C22 to slide vertically. After the battery bag completes the pre-expansion process, the expansion piece C22 moves vertically under the action of the second electric cylinder C23 until it enters the battery bag to complete the expansion process. In addition, since the size of the expansion piece C22 increases gradually from bottom to top, it is convenient for the expansion piece C22 to enter the interior of the battery bag and reduce the possibility of damaging the battery bag. The injection mechanism C3 includes a second pre-expansion component C7, an injection base C31, an injection piece C32, a liquid storage tank C33, a first liquid The pump (not shown in the figure) and the third electric cylinder C34, the second pre-expansion component C7 is used to grab the opposite sides of the battery cell battery bag, the injection piece C32 is vertically slidably arranged on the injection machine base C31, the third electric cylinder C34 is vertically installed on the injection machine base C31 and is used to drive the injection piece C32 to move vertically, the liquid storage tank C33 is filled with electrolyte, the liquid storage tank C33 and the first liquid pump are both arranged on one side of the injection machine base C31, one end of the first liquid pump is connected to the injection piece C32 through an infusion tube (not shown in the figure) and the other end is connected to the liquid storage tank C33 through an infusion tube. When the battery cell moves to the injection mechanism C3 through the annular track module 7, the injection piece C32 moves vertically under the action of the third electric cylinder C34 until it enters the battery bag, and then the first liquid pump is started to pump the electrolyte in the liquid storage tank C33 into the injection piece C32 through the infusion tube, so that it enters the battery cell battery bag to complete the injection.

[0058] The first pre-expansion component C6 and the second pre-expansion component C7 each include two relative mounting seats C61 and a pre-expansion drive component C62. The two mounting seats C61 are both horizontally slidably arranged on the expansion mechanism C2 or the injection mechanism C3. Each mounting seat C61 is horizontally provided with a second suction cup C67, and the second suction cup C67 is connected to an external air pump. When the battery cell is located between the two mounting seats C61, the two second suction cups C67 are respectively used to abut the opposite sides of the battery cell battery bag. The pre-expansion drive component C62 is used to drive the two relative mounting seats C61 to move toward or away from each other. When the battery cell is vertically placed on the work station seat C5 and moved to the expansion mechanism C2, the pre-expansion drive component C62 is started to drive the two relative mounting seats C61 to move toward each other, so that the second suction cups C67 located on the two mounting seats C61 move close to the opposite sides of the battery cell battery bag until they abut, and then the battery cell is placed vertically on the work station seat C5 and moved to the expansion mechanism C2. An external air pump is used to make the second suction cup C67 produce a continuous adsorption force on the battery bag, and then the pre-expansion drive component C62 is used to drive the two mounting seats C61 to move in opposite directions. The battery bag is opened by the pull of the second suction cups C67 on both sides, so as to realize the pre-expansion operation of the battery bag by the first pre-expansion component C6, and then the formal expansion of the battery bag is completed by the expansion mechanism C2; when the battery cell moves to the injection mechanism C3, the pre-expansion drive component C62 is started to drive the two relative mounting seats C61 to move in opposite directions, so that the second suction cups C67 located on the two mounting seats C61 move close to the opposite sides of the battery cell battery bag until they abut, and then an external air pump is used to make the second suction cup C67 produce a continuous adsorption force on the battery bag, so that the battery cell battery bag always remains in the expanded state, which can avoid leakage caused by the elastic resetting of the battery bag causing the opening to shrink during the injection process.

[0059] In addition, the expanding mechanism C2 and the injection mechanism C3 are both vertically slidably connected to the lifting plate C8, and the two mounting seats C61 are both installed under the lifting plate C8. The expanding mechanism C2 and the injection mechanism C3 are both vertically installed with the first cylinder C9, and the piston rod of the first cylinder C9 is fixedly connected to the lifting plate C8. By setting the lifting plate C8, an installation position can be provided for the mounting seat C61. At the same time, the height of the lifting plate C8 can be adjusted by starting the first cylinder C9, thereby driving the mounting seat C61 to move vertically, and then adjusting the height of the second suction cup C67 to provide space for battery cell loading, and when performing the pre-expansion process, cooperate with the pre-expansion drive assembly C62 to control the second suction cup C67 to move in two axes to approach the two sides of the battery bag of the battery cell.

[0060] Specifically, the pre-expansion drive assembly C62 includes a connecting piece C63, on which two symmetrical and inclined first strip sliding holes C64 are provided, and the ends of the two mounting seats C61 are provided with first sliders C65, and the two first sliders C65 are respectively slidably matched in the two first strip sliding holes C64, and a first electric cylinder C66 is vertically installed on the connecting piece C63, and the piston rod of the first electric cylinder C66 is fixedly connected to the connecting piece C63. When the pre-expansion drive assembly C62 is working, the first electric cylinder C66 is started to drive the piston rod to drive the connecting piece C63 to move vertically. The two first strip sliding holes C64 are symmetrical and inclined, and the two first sliding blocks C65 respectively move toward or away from each other along the length direction of the corresponding first strip sliding holes C64. In addition, the two mounting seats C61 are both horizontally slidably arranged, so that the two mounting seats C61 can move toward or away from each other in the horizontal direction, so as to realize the function of the two mounting seats C61 and the second suction cups C67 on both sides moving toward or away from each other.

[0061] Furthermore, the injection mechanism C3 also includes a buffer replenishing tank C35 and a second liquid pump (not shown in the figure). The buffer replenishing tank C35 is arranged directly above the liquid storage tank C33. The second liquid pump is connected to the buffer replenishing tank C35 and is used to transport electrolyte from the outside to the buffer replenishing tank C35. The buffer replenishing tank C35 is connected to the liquid storage tank C33 through an infusion tube directly below. The second liquid pump can pump electrolyte from the outside into the buffer replenishing tank C35 to complete the replenishment of the electrolyte. Under the action of gravity, the electrolyte inside the buffer replenishing tank C35 gradually flows from the buffer replenishing tank C35 through the infusion tube into the liquid storage tank C33, so as to temporarily store the electrolyte, balance the pressure fluctuations during the electrolyte transportation process to a certain extent, and improve the stability and reliability of the injection mechanism C3.

[0062] Furthermore, the liquid injection mechanism C3 also includes a plurality of collection boxes C36 with top openings and a movable plate C37. The collection boxes C36 correspond to the liquid injection parts C32 one by one and are installed on the movable plate C37. The movable plate C37 is slidably arranged on the liquid injection machine base C31. There is a collection position on the sliding path of the collection box C36. When the collection box C36 is located at the collection position, the collection box C36 is located directly below the liquid injection part C32. The liquid injection machine base C31 is provided with a second cylinder C3 for driving the collection box C36 to slide. 8. After the liquid injection process is completed, the third electric cylinder C34 drives the liquid injection part C32 to move vertically upward away from the battery cell to make way for the movable plate C37 and the collecting box C36. In the process of vertical movement, the leaked liquid will drip into the battery cell without leaking out. After making way, the second cylinder C38 drives the movable plate C37 to drive the collecting box C36 to move to the collection position, and the leaked liquid drips into the collecting box C36 for collection, thereby avoiding the waste of electrolyte and reducing the possibility of electrolyte splashing to the site.

[0063] Furthermore, the size of the injection piece C32 increases gradually from bottom to top, so as to facilitate the injection piece C32 to enter the battery bag of the battery cell and reduce the possibility of damaging the battery bag.

[0064] Reference Figures 16 to 20The vacuum packaging device 2 includes a primary vacuum pumping mechanism D2 and a secondary vacuum pumping and sealing mechanism D3. The primary vacuum pumping mechanism D2 is used to perform a preliminary vacuum pumping treatment on the inside of the battery bag of the battery cell and place the battery cell in a vacuum environment for static treatment. The secondary vacuum pumping and sealing mechanism D3 is used to perform a secondary vacuum pumping and sealing treatment on the battery bag of the battery cell that has been treated by the primary vacuum pumping mechanism D2 in a vacuum environment. The battery cell is placed on a work station seat C5 to ensure the positioning stability of the battery cell during the subsequent vacuum pumping process. Under the action of the annular track module 7, the battery cell can enter the primary vacuum pumping mechanism D2 and the secondary vacuum pumping and sealing mechanism D3 in turn to complete the vacuum pumping and sealing processes in turn. In the primary vacuum pumping mechanism D2, the inside of the battery bag of the battery cell can be preliminarily vacuum pumped to remove most of the air and impurities in the battery bag, while placing the battery cell in a vacuum environment. The battery cell is allowed to stand in a static environment. During the static stage, the gas inside the battery cell is further discharged and the internal pressure is gradually stabilized, so as to prepare for the subsequent secondary vacuuming and sealing, ensure the quality of the subsequent sealing process, and improve the consistency of mass production of battery cells. After completing the primary vacuuming and standing, the battery cell is transported to the secondary vacuuming and sealing mechanism D3. In the secondary vacuuming and sealing mechanism D3, the battery cell battery bag is subjected to secondary vacuuming treatment to ensure that the vacuum degree inside the battery bag meets the standard, and then the battery cell battery bag is sealed to form a finished battery cell. Among them, the secondary vacuuming and sealing mechanism D3 performs secondary vacuuming treatment on the battery cell battery bag, which can discharge excess gas impurities in the battery cell, and integrate the vacuuming process and the sealing process into the same mechanism at the same time, so that the battery cell can complete the sealing process synchronously under a vacuum environment, improve the integration of processes and equipment, and thus improve the production efficiency of lithium batteries.

[0065] It should be noted that the annular track module 7 can adopt conventional conveying equipment on the market, such as an electric track module, a belt conveying module, etc., and the working plate C1 can be slidably installed on the conveying equipment to achieve the mobile conveying of the working plate C1.

[0066] Specifically, in the present embodiment, the primary vacuum mechanism D2 includes a vertically arranged first mounting frame D21, a first vacuum cylinder D22 and a first vacuum box D23. The first vacuum cylinder D22 is vertically mounted on the first mounting frame D21. The top of the first vacuum box D23 is fixedly connected to the piston rod of the first vacuum cylinder D22. There is a closed position on the moving path of the first vacuum box D23. When the first vacuum box D23 is in the closed position and the working plate C1 is directly below the first vacuum box D23, a closed cavity is formed between the first vacuum box D23 and the working plate C1. The vacuum box D23 is provided with a first air suction port D24, and the first air suction port D24 is connected to an external air pump. When the annular track module 7 drives the working plate C1 to move to the first vacuum box D23, the first vacuum cylinder D22 is controlled to drive the piston rod to drive the first vacuum box D23 to rise and fall, so as to cooperate with the working plate C1 to form a closed cavity, so that the battery cells in each work station C5 can be in a stable and controlled environment, which can effectively improve the accuracy and consistency of vacuum extraction, and then the external air pump vacuums the closed cavity through the first air suction port D24 to remove air and impurities inside the battery cell battery bag.

[0067] The secondary vacuum sealing mechanism D3 includes a second mounting frame D31 arranged vertically, a second vacuum cylinder D32 and a second vacuum box D33. The second vacuum cylinder D32 is vertically mounted on the second mounting frame D31. The top of the second vacuum box D33 is fixedly connected to the piston rod of the second vacuum cylinder D32. There is a closed position on the moving path of the second vacuum box D33. When the second vacuum box D33 is in the closed position and the working plate C1 is directly below the second vacuum box D33, a closed cavity is formed between the second vacuum box D33 and the working plate C1. The second vacuum box D33 is provided with a second air pumping port D34. The second air pumping port D34 is connected to an external air pump. A number of sealing modules D35 are arranged inside the second vacuum box D33 corresponding to the number of workstations C5. Between the second vacuum box D33 and the working plate C1 When forming a closed cavity, the sealing module D35 is used to seal the battery cell bag on the corresponding work station C5. When the annular track module 7 drives the working plate C1 to move to the second vacuum box D33, the second vacuum box D33 is driven by controlling the piston rod of the second vacuum cylinder D32 to form a closed cavity in cooperation with the working plate C1, so that the battery cells in each work station C5 can be in a stable and controlled environment, which can further improve the accuracy and consistency of vacuuming. Then, the external air pump further vacuums the closed cavity through the second vacuum port D34, and simultaneously completes the sealing process through the corresponding sealing module D35 under a vacuum environment. Therefore, the sealing process of the battery cell bag can be completed while further vacuuming is being carried out under a vacuum environment, so as to improve the integration of processes and equipment, thereby improving the production efficiency of lithium batteries.

[0068] Specifically, Fig. 20As shown, the sealing module D35 includes a lifting cylinder D351, a lifting hot-pressing linkage component D352 and two hot-pressing sealing blocks D353 arranged opposite to each other. The lifting cylinder D351 is vertically installed and passes through the top of the second vacuum cylinder D32. The two hot-pressing sealing blocks D353 are both connected to the lifting cylinder D351 and are provided with heating elements inside. The heating elements are used to heat the hot-pressing sealing blocks D353. The lifting hot-pressing linkage component D352 is connected to the lifting cylinder D351 and when the lifting cylinder D351 drives the piston rod to drive the two hot-pressing sealing blocks D353 to move downward or upward, the two hot-pressing sealing blocks D353 are driven to move toward or away from each other. The second vacuum box D33 and the working plate C1 are formed. After the closed cavity is formed and the secondary vacuuming process is completed, the lifting cylinder D351 drives the two relatively arranged hot-pressing sealing blocks D353 to move downward close to the battery cell battery bag on the work station C5. At the same time, the lifting and hot-pressing linkage assembly D352 drives the two hot-pressing sealing blocks D353 to move toward each other until the two hot-pressing sealing blocks D353 respectively abut against the opposite sides of the battery cell battery bag, and then the hot-pressing sealing blocks D353 are heated by the heating element to complete the hot-pressing sealing operation of the battery cell battery bag. Among them, by setting the lifting and hot-pressing linkage assembly D352, the two relatively hot-pressing sealing blocks D353 can perform dual-axis movement operations synchronously, which can improve the sealing efficiency of the battery cell battery bag.

[0069] Preferably, if Fig. 20 As shown, the lifting and hot pressing linkage assembly D352 includes a lifting and moving frame D3521 and a connecting plate D3522. The lifting and moving frame D3521 and the connecting plate D3522 are both fixedly connected to the piston rod of the lifting cylinder D351. The connecting plate D3522 is provided with two symmetrical and inclined second strip sliding holes D3523. A second slider D3524 is slidingly arranged in the second strip sliding hole D3523. The two hot pressing sealing blocks D353 are respectively fixedly connected to the two second sliders D3524 and are both slidingly connected to the lifting and moving frame D3521. When the lifting cylinder D351 drives the piston When the rod moves downward, it will drive the lifting and moving frame D3521 and the connecting plate D3522 to move downward synchronously. At this time, the connecting plate D3522 abuts against the second slider D3524 located in the second strip sliding hole D3523. Since the second strip sliding hole D3523 is inclined, the second slider D3524 will synchronously produce horizontal displacement during the downward movement, so as to drive the hot-pressing sealing block D353 fixedly connected thereto to synchronously produce horizontal displacement on the lifting and moving frame D3521, thereby driving the hot-pressing sealing block D353 to be lifted and moved horizontally synchronously, thereby improving the battery cell sealing efficiency.

[0070] Furthermore, the lifting and moving frame D3521 is provided with a guide rail D6, and the two hot pressing and sealing blocks D353 are both slidably connected to the guide rail D6. By providing the guide rail D6, a guiding function can be provided to the hot pressing and sealing blocks D353, and the sliding stability thereof can be improved.

[0071] Reference Figure 21 to Figure 23 The battery cell tray loading and unloading device 5 includes an empty tray conveyor belt E1, a full tray conveyor belt E2, a tray switching mechanism E3 and a battery cell stacking mechanism E4. The feeding side of the empty tray conveyor belt E1 is provided with a tray disassembling mechanism E5, which is used to split the tray pile into individual trays and transfer the trays to the feeding side of the empty tray conveyor belt E1. The empty tray conveyor belt E1 is used to convey the trays one by one to the tray switching mechanism E3. The tray switching mechanism E3 is provided between the empty tray conveyor belt E1 and the battery cell stacking mechanism E4. The full tray conveyor belt E2 is between the full tray conveyor belts and is used to transfer the trays from the empty tray conveyor belt E1 to the feeding side of the full tray conveyor belt E2. The battery cell stacking mechanism E4 is arranged on the full tray conveyor belt E2 and is used to stack the finished battery cells into the trays. The discharge side of the full tray conveyor belt E2 is provided with a tray stacking mechanism E6, which is used to stack the stacked trays to form a tray pile. The full tray conveyor belt E2 is used to convey the trays to the battery cell stacking mechanism E4 and the tray stacking mechanism E6 in sequence. When working, the empty trays are piled into the feeding side of the empty tray conveyor belt E1. The tray dismantling mechanism E5 can split the empty tray pile into individual trays one by one, and transport them to the tray switching mechanism E3 through the empty tray conveyor belt E1 one by one. The tray switching mechanism E3 is responsible for conveying the empty trays from the empty tray conveyor belt E1 to the full tray conveyor belt E2, and conveying the empty trays to the battery cell stacking mechanism E4 and the tray stacking mechanism E6 in sequence through the full tray conveyor belt E2. During this period, the battery cell stacking mechanism E4 is responsible for accurately stacking the processed batteries from the production line into the empty trays, and the tray stacking mechanism E6 is responsible for stacking the trays filled with batteries. After the tray stack is formed, it is transported to the discharge side through the full tray conveyor belt E2 to complete the discharge. Among them, the tray dismantling process, tray loading process, stacking process and transfer process are integrated into one, and the processes are smooth and efficient. No manual intervention is required in the middle, which reduces human errors, ensures the neat arrangement of batteries and trays, and improves the overall production efficiency of lithium batteries.

[0072] It should be noted that, in this embodiment, both the empty tray conveyor belt E1 and the full tray conveyor belt E2 use two chain conveyor belts. By placing the two sides of the tray on the two chain conveyor belts respectively, it is convenient for transportation. At the same time, the stacking mechanism and the tray disassembly mechanism E5 can make way between the two chain conveyor belts, thereby optimizing the spatial layout of the equipment.

[0073] Preferably, the tray dismantling mechanism E5 includes a first transverse supporting component E51, a first vertical supporting component E52 and a first material blocking component E53. The first vertical supporting component E52 is used to support the bottom of the empty tray pile and drive the empty tray pile to move vertically. The first transverse supporting component E51 is used to laterally clamp the trays at the current height of the empty tray pile. The first material blocking component E53 is used to block the trays inside the feed side of the empty tray conveyor belt E1. When the empty tray pile is placed on the feed side of the empty tray conveyor belt E1, the first material blocking component E53 blocks and positions the empty tray pile to facilitate the tray dismantling process. The stack of empty trays is moved vertically by the empty tray stack until it is lifted to an appropriate height. At this time, the adjacent trays of the bottom tray in the stack of empty trays are clamped and kept stationary by the lateral supporting assembly, and then the bottom tray is driven to move vertically to the empty tray conveyor belt E1 by the vertical supporting assembly, so that the bottom tray can be separated from the stack of empty trays to prepare for subsequent transportation, thereby completing the tray disassembly process, wherein the first lateral supporting assembly E51 and the first vertical supporting assembly E52 work in coordination to achieve rapid and accurate disassembly of the trays, thereby improving the degree of automation of loading and unloading of the cell trays, thereby improving the production efficiency of lithium batteries.

[0074] Specifically, the first transverse supporting assembly E51 includes two symmetrically arranged first transverse cylinders E511, and the two first transverse cylinders E511 are respectively arranged on opposite sides of the empty disk conveyor belt E1. A first L-shaped clamping plate E512 is installed at the piston rod of the first transverse cylinder E511, and the first L-shaped clamping plate E512 is used to abut the side of the material tray and support the bottom of the material tray. The first vertical supporting assembly E52 includes a first vertical cylinder E521 and a first vertical supporting plate E522. The first vertical cylinder E521 is vertically arranged inside the empty disk conveyor belt E1, and the first vertical supporting plate E522 is fixedly connected to the piston rod of the first vertical cylinder E521. The first material blocking assembly E53 includes two symmetrically arranged limiting L-shaped members E531, and the two limiting L-shaped members E531 are respectively arranged on the empty disk conveyor belt E1. On the opposite sides of the feeding point of belt E1, a limiting opening E532 is provided at the bottom end of the limiting L-shaped part E531, and a limiting channel for a single material tray to pass through is formed between the limiting opening E532 and the empty tray conveyor belt E1, wherein two symmetrically arranged first horizontal cylinders E511 and the first L-shaped clamping plate E512 can clamp the sides of the material tray and support the pile of empty material trays, thereby ensuring the stability of the material trays during tray removal; the first vertical supporting plate E522 and the first vertical cylinder E521 can lift and support the pile of empty material trays; the limiting L-shaped part E531 and the limiting opening E532 provided therein can realize the function that during the tray removal process, only the material tray at the bottom of the pile of empty material trays can pass through the limiting channel, and the other material trays are blocked by the limiting L-shaped part E531, and the structure is ingenious and practical.

[0075] In addition, the tray stacking mechanism E6 includes a second transverse supporting assembly E61, a second vertical supporting assembly E62 and a second material blocking assembly E63. The second vertical supporting assembly E62 is used to drive the tray filled with battery cells to move vertically. The second transverse supporting assembly E61 is used to laterally clamp the tray filled with battery cells at the current height of the stack. The second material blocking assembly E63 is used to block the tray inside the discharge side of the full tray conveyor belt E2. When the tray filled with battery cells is conveyed to the tray stacking mechanism E6 of the full tray conveyor belt E2, the second material blocking assembly E63 blocks and positions the tray filled with battery cells to facilitate the stacking process. The second vertical supporting assembly E62 supports the tray and drives the tray to move vertically until the tray is stacked. The stacking is completed by abutting the bottom tray in the tray stack, and the second vertical supporting assembly E62 supports the tray stack. Then the second horizontal supporting assembly E61 releases the clamping of the tray stack, and the second vertical supporting assembly E62 drives the tray stack to move up the height of one tray. The second horizontal supporting assembly E61 then clamps the bottom tray and keeps it still to complete the stacking process. Finally, the second material blocking assembly E63 releases the obstruction of the tray stack to complete the discharging. The coordinated work of the second horizontal supporting assembly E61 and the second vertical supporting assembly E62 can realize fast and accurate stacking of the trays, improve the degree of automation of loading and unloading of the cell trays, and thus improve the production efficiency of lithium batteries.

[0076] Specifically, the second transverse supporting assembly E61 includes two symmetrically arranged second transverse cylinders E611, and the two second transverse cylinders E611 are respectively arranged on opposite sides of the full-plate conveyor belt E2. A second L-shaped clamping plate E612 is installed at the piston rod of the second transverse cylinder E611, and the second L-shaped clamping plate E612 is used to abut the side of the material tray and support the bottom of the material tray. The second vertical supporting assembly E62 includes a second vertical cylinder E621 and a second vertical supporting plate E622. The second vertical cylinder E621 is vertically arranged inside the full-plate conveyor belt E2, and the second vertical supporting plate E622 is fixedly connected to the piston rod of the second vertical cylinder E621. The second material blocking assembly E63 includes two symmetrically arranged material blocking cylinders E631, and the two material blocking cylinders E632 are used to abut the side of the material tray and support the bottom of the material tray. Cylinder E631 is respectively arranged on the opposite sides of the discharge point of the full tray conveyor belt E2, and a discharge baffle E632 is installed on the piston rod of the blocking cylinder E631, wherein two symmetrically arranged second horizontal cylinders E611 and the second L-shaped clamping plate E612 can clamp the side of the tray and support the tray stack to ensure the stability of the tray during stacking, and the second vertical supporting plate E622 and the second vertical cylinder E621 can lift and support the tray or tray stack, and the blocking cylinder E631 and the discharge baffle E632 can realize the limiting function of the tray stack during the stacking process, and after the stacking process is completed, the discharging baffle E632 can be opened by the blocking cylinder E631 to release the limit to complete the discharging process.

[0077] In addition, the tray switching mechanism E3 includes a biaxial moving module E31 and a clamping assembly E32 connected to the biaxial moving module E31. The biaxial moving module E31 is used to drive the clamping assembly E32 to perform vertical and lateral displacement between the discharge side of the empty tray conveyor belt E1 and the feed side of the full tray conveyor belt E2. The clamping assembly E32 is used to clamp both sides of the tray. Among them, the biaxial moving module E31 is combined with the clamping assembly E32 to realize the transfer of the empty tray conveyed to the discharge side of the empty tray conveyor belt E1 to the feed side of the full tray conveyor belt E2, thereby greatly improving the efficiency of tray switching, thereby improving the production efficiency of lithium batteries.

[0078] Specifically, the dual-axis moving module E31 includes a linear module E311, a transfer frame E312 connected to the linear module E311, and a tray switching cylinder E313. The linear module E311 is arranged between the empty tray conveyor belt E1 and the full tray conveyor belt E2 and is used to drive the transfer frame E312 to slide. The tray switching cylinder E313 is vertically installed on the transfer frame E312. The clamping assembly E32 includes a clamping mounting plate E321 and two symmetrically arranged pushing and clamping cylinders E322. The clamping mounting plate E321 is fixedly connected to the piston rod of the tray switching cylinder E313. The two pushing and clamping cylinders E3 22 are respectively arranged on both sides of the clamping mounting plate E321, and the piston rod of the pushing clamping cylinder E322 is installed with a third L-shaped clamping plate E323, and the third L-shaped clamping plate E323 is used to abut the side of the material tray, wherein the linear module E311 is matched with the material tray switching cylinder E313, which can realize the function of dual-axis driving, so that the transfer frame E312 can drive the clamping assembly E32 to move to the material tray to be transferred, and drive the third L-shaped clamping plate E323 to move toward each other through two symmetrically arranged pushing clamping cylinders E322 until it abuts the side of the material tray, which can realize the function of clamping and supporting the material tray.

[0079] In addition, a third vertical cylinder E7 is vertically arranged inside the full tray conveyor belt E2, and a stacking baffle E8 is fixedly installed at the piston rod of the third vertical cylinder E7. The stacking baffle E8 is used to block the empty trays. When the battery cell stacking mechanism E4 is working, the third vertical cylinder E7 is started to drive the stacking baffle E8 to move vertically, so that the stacking baffle E8 blocks the empty trays conveyed by the full tray conveyor belt E2, so that the battery cell stacking mechanism E4 can stably stack the finished battery cells on the empty trays.

[0080] It should be noted that the battery cell stacking mechanism E4 can adopt a conventional battery cell stacking mechanism E4 on the market, such as a combination of a rotary manipulator and pneumatic fingers, so as to pick up the finished battery cells on the unloading conveyor belt 10 one by one to the empty material tray of the full tray conveyor belt E2 to realize the stacking of the battery cells, and there is no limitation here.

[0081] The above specific implementations do not constitute a limitation on the protection scope of this application. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of this application should be included in the protection scope of this application.

Claims

1. A battery cell injection production line, characterized in that: include: A battery cell loading and detection device (1) for loading battery cells and removing unqualified battery cells; An expansion mechanism (C2), which is used to expand the battery cell; A liquid injection mechanism (C3), which is used to inject liquid into the battery cell; A vacuum packaging device (2) for performing vacuum processing and packaging processing on the battery cell after liquid injection; A primary cell liquid injection weighing device (3) for detecting the weight of the cell before liquid injection; A secondary battery cell injection weighing device (4) for detecting the weight of the battery cell after injection; A cell tray loading and unloading device (5) for loading and unloading the packaged cells; A conveying device is provided for conveying the battery cells from the battery cell loading and detecting device (1) to the primary battery cell liquid injection and weighing device (3), the expansion mechanism (C2), the liquid injection mechanism (C3), the vacuum packaging device (2), the secondary battery cell liquid injection and weighing device (4) and the battery cell tray loading and unloading device (5) in sequence.

2. A battery cell injection production line as claimed in claim 1, characterized in that: The battery cell loading detection device (1) comprises a loading conveyor belt (A1), wherein the loading conveyor belt (A1) is provided with a plurality of station areas (A2) for placing battery cells along a conveying direction; A detection device (A3), which is arranged on the feeding side of the feeding conveyor belt (A1) and is used to detect the battery cells on each of the workstation areas (A2) one by one and record the information of the workstation area (A2) where the unqualified battery cells are located; A defective collection mechanism (A4), which is controllably connected to the detection device (A3) and is used to transfer defective cells out of the loading conveyor belt (A1); A battery cell replenishing mechanism (A5) is controllably connected to the detection device (A3). After the defective collection mechanism (A4) transfers the unqualified battery cells out of the loading conveyor belt (A1), the battery cell replenishing mechanism (A5) is used to continuously transfer the battery cells that have passed the previous detection to the workstation area (A2) where the unqualified battery cells are located.

3. A battery cell injection production line as claimed in claim 2, characterized in that: The defective collection mechanism (A4) comprises a defective collection box (A41), a first grabbing component (A42) and a first biaxial moving device (A43); the defective collection box (A41) is open at the top and is arranged on one side of the feeding conveyor belt (A1); the first grabbing component (A42) is connected to the first biaxial moving device (A43) and is used to grab defective batteries on the feeding conveyor belt (A1); the first biaxial moving device (A43) is used to drive the first grabbing component (A42) to move horizontally and vertically; the battery cell replenishing mechanism (A5) comprises a second grabbing component (A51) and a second biaxial moving device (A52); the second grabbing component (A51) is connected to the second biaxial moving device (A52) and is used to grab qualified batteries on the feeding conveyor belt (A1); the second biaxial moving device (A52) is used to drive the second grabbing component (A51) to move horizontally and vertically.

4. A battery cell injection production line as claimed in claim 1, characterized in that: The primary battery cell injection weighing device (3) and the secondary battery cell injection weighing device (4) both comprise a weighing workbench (B3), on which a plurality of weighing sensors (B5) are arranged, and each of the weighing sensors (B5) is provided with a weighing seat (B6) for placing a battery cell, and the weighing sensor (B5) is used to detect the weight of the battery cell in the weighing seat (B6).

5. A battery cell injection production line as claimed in claim 1, characterized in that: The expansion mechanism (C2) comprises a first pre-expansion component (C6), an expansion base (C21) and an expansion piece (C22), wherein the first pre-expansion component (C6) is used for pre-expansion of the battery cell bag, the expansion piece (C22) is vertically slidably arranged on the expansion base (C21), the size of the expansion piece (C22) gradually increases from bottom to top, and the expansion base (C21) is vertically fixedly installed with a second electric cylinder (C23), and the second electric cylinder (C23) is used for driving the expansion piece (C22) to slide vertically; The injection mechanism (C3) comprises a second pre-expansion component (C7), a liquid injection machine base (C31), a liquid injection piece (C32), a liquid storage tank (C33), a first liquid pump and a third electric cylinder (C34), the second pre-expansion component (C7), the second pre-expansion component (C7) is used to grasp the opposite sides of the battery bag of the battery cell to maintain the opening state of the battery bag of the battery cell, the liquid injection piece (C32) is vertically slidably arranged on the liquid injection machine base (C31), the third electric cylinder (C34) is vertically installed on the liquid injection machine base (C31) and is used to drive the liquid injection piece (C32) to move vertically, the liquid storage tank (C33) contains electrolyte, the liquid storage tank (C33) and the first liquid pump are both arranged on one side of the liquid injection machine base (C31), one end of the first liquid pump is connected to the liquid injection piece (C32) through an infusion tube and the other end is connected to the liquid storage tank (C33) through an infusion tube.

6. A battery cell injection production line as claimed in claim 5, characterized in that: The first pre-expansion component (C6) and the second pre-expansion component (C7) each include two relative mounting seats (C61) and a pre-expansion drive component (C62); the two mounting seats (C61) are both horizontally slidably arranged on the expansion mechanism (C2) or the injection mechanism (C3); each mounting seat (C61) is horizontally provided with a second suction cup (C67); the second suction cup (C67) is connected to an external air pump; when the battery cell is located between the two mounting seats (C61), the two second suction cups (C67) are respectively used to abut against opposite sides of the battery cell bag; the pre-expansion drive component (C62) is used to drive the two relative mounting seats (C61) to move toward or away from each other.

7. A battery cell injection production line as claimed in claim 1, characterized in that: The vacuum packaging device (2) comprises a primary vacuum pumping mechanism (D2) and a secondary vacuum pumping and sealing mechanism (D3), wherein the primary vacuum pumping mechanism (D2) is used to perform preliminary vacuum pumping treatment on the interior of a battery cell bag and to place the battery cell in a vacuum environment for static treatment, and the secondary vacuum pumping and sealing mechanism (D3) is used to perform secondary vacuum pumping treatment and sealing treatment on the battery cell bag treated by the primary vacuum pumping mechanism (D2) in a vacuum environment.

8. A battery cell injection production line as claimed in claim 7, characterized in that: The secondary vacuum sealing mechanism (D3) includes a second vertically arranged mounting frame (D31), a second vacuum cylinder (D32) and a second vacuum box (D33), wherein the second vacuum cylinder (D32) is vertically mounted on the second mounting frame (D31), and the top of the second vacuum box (D33) is fixedly connected to the piston rod of the second vacuum cylinder (D32). There is a closed position on the moving path of the second vacuum box (D33). When the second vacuum box (D33) is located at the closed position and the conveying device conveys the battery cell to the bottom of the second vacuum box (D33), a closed cavity is formed between the second vacuum box (D33) and the conveying device. The second vacuum box (D33) is provided with a second vacuum port (D34), and the second vacuum port (D34) is connected to an external air pump. A number of sealing modules (D35) are arranged inside the second vacuum box (D33) corresponding to the number of battery cells. The sealing module (D35) includes a lifting cylinder (D351), a lifting and hot-pressing linkage assembly (D352) and two hot-pressing sealing blocks (D353) arranged opposite to each other. The lifting cylinder (D351) is vertically installed and passes through the top of the second vacuum cylinder (D32). The two hot-pressing sealing blocks (D353) are both connected to the lifting cylinder (D351) and are provided with heating elements inside. The heating elements are used to heat the hot-pressing sealing blocks (D353). The lifting and hot-pressing linkage assembly (D352) is connected to the lifting cylinder (D351) and when the lifting cylinder (D351) drives the piston rod to drive the two hot-pressing sealing blocks (D353) to move downward or upward, the two hot-pressing sealing blocks (D353) are driven to move toward or away from each other.

9. A battery cell injection production line as claimed in claim 8, characterized in that: The lifting and hot-pressing linkage assembly (D352) includes a lifting and moving frame (D3521) and a connecting plate (D3522). The lifting and moving frame (D3521) and the connecting plate (D3522) are both fixedly connected to the piston rod of the lifting cylinder (D351). The connecting plate (D3522) is provided with two symmetrical and obliquely arranged second strip sliding holes (D3523). A second slider (D3524) is slidingly arranged in the second strip sliding hole (D3523). The two hot-pressing sealing blocks (D353) are respectively fixedly connected to the two second sliders (D3524) and are both slidingly connected to the lifting and moving frame (D3521).

10. The battery cell injection production line according to claim 1, characterized in that: The battery cell tray loading and unloading device (5) comprises an empty tray conveyor belt (E1), a full tray conveyor belt (E2), a tray switching mechanism (E3) and a battery cell stacking mechanism (E4); a tray disassembling mechanism (E5) is provided on the feeding side of the empty tray conveyor belt (E1); the tray disassembling mechanism (E5) is used to disassemble a tray pile into individual trays and transfer the trays to the feeding side of the empty tray conveyor belt (E1); the empty tray conveyor belt (E1) is used to convey the trays one by one to the tray switching mechanism (E3); the tray switching mechanism (E3) is provided between the empty tray conveyor belt (E1) and the battery cell stacking mechanism (E4); The full tray conveyor belt (E2) is provided between the full tray conveyor belt (E2) and is used to transfer the trays from the empty tray conveyor belt (E1) to the feeding side of the full tray conveyor belt (E2); the battery cell stacking mechanism (E4) is arranged on the full tray conveyor belt (E2) and is used to stack the finished battery cells into the trays; a tray stacking mechanism (E6) is arranged on the discharge side of the full tray conveyor belt (E2); the tray stacking mechanism (E6) is used to stack the stacked trays to form a tray pile; the full tray conveyor belt (E2) is used to convey the trays to the battery cell stacking mechanism (E4) and the tray stacking mechanism (E6) in sequence.

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