Forming device for lithium battery production and manufacturing

Abstract

A forming device for lithium battery production and manufacturing comprises a bottom frame, a connecting plate is arranged on the bottom frame, a containing groove is formed in the connecting plate, a support is arranged on the connecting plate, an air cylinder is connected to the support, the output end of the air cylinder is connected with an upper fixing frame, and a lower floating frame is arranged below the upper fixing frame. The bottom surface of the lower floating frame is connected with a pricking needle, the connecting plate is provided with a needle avoiding groove, the needle avoiding groove is located below the pricking needle, and the needle avoiding groove is communicated with a vacuum pump; the bottom face of the upper fixing frame is connected with an edge sealing body, and the bottom of the upper fixing frame is connected with a cutter. According to the forming device for lithium battery production and manufacturing, the weighing device is arranged to judge whether the electrolyte injection amount in a lithium battery pack is qualified or not, and whether the electrolyte fully infiltrates a pole piece and a diaphragm or not is judged in an auxiliary mode during vacuumizing; the vacuum-pumping, edge-sealing and edge-cutting operations are realized in sequence in one pressing process, and the pricking needle can return for a certain distance after pricking the aluminum-plastic film during vacuum-pumping, so that a gap is formed between the pricking needle and a pricking hole of the aluminum-plastic film, an airflow passage is enlarged, and the vacuum-pumping efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of lithium battery pack forming, and particularly to a forming device for lithium battery production and manufacturing. Background Art

[0002] The forming process of soft-pack lithium batteries is a core link in their manufacturing process, mainly involving the fixation, encapsulation of the internal structure of the battery cells, and the integration of external modules. The forming of soft-pack lithium batteries can be divided into two stages: single-cell forming and module forming. Among them, the single-cell forming steps in the single-cell forming stage include pole piece preparation, stacking / winding, aluminum-plastic film encapsulation, liquid injection and pre-encapsulation, formation and degassing.

[0003] Aluminum-plastic film encapsulation involves heat-sealing forming. The stacked / wound battery cell is placed in the aluminum-plastic film, and the edge of the aluminum-plastic film is heated by a hot press and pressure is applied to seal the edge to form a closed cavity. Then, electrolyte is injected and left standing to allow the electrolyte to infiltrate the pole pieces. After that, vacuum pumping is required to extract the residual gas inside the battery cell, including the air remaining after liquid injection, the bubbles generated during the infiltration process of the electrolyte, and the gas released by the electrochemical reaction during formation.

[0004] During the manufacturing process of soft-pack lithium batteries, the injection volume of the liquid electrolyte is precisely calculated. However, in actual production, due to process fluctuations, the injection volume of the electrolyte may exceed the design value, that is, there is excessive electrolyte. At this time, there is free electrolyte; if the electrolyte does not completely infiltrate the pole pieces / separator, there is also free liquid electrolyte. The free electrolyte is dragged out of the battery cell by the vacuum adsorption force during the subsequent vacuum pumping process. If the electrolyte is a low-viscosity electrolyte, it is more likely to be pumped out under the conditions of low viscosity and low surface tension.

[0005] Currently, for unqualified situations such as excessive electrolyte or incomplete infiltration of the pole pieces / separator by the electrolyte, inspection is carried out through sampling inspection. For the situation of excessive liquid injection, it is generally detected by weighing, and the infiltration state is generally detected by X-ray imaging. It is impossible to inspect all soft-pack lithium batteries. This application detects the injection volume and infiltration state of the electrolyte while sealing the edge, and immediately determines whether it is qualified. Summary of the Invention

[0006] In view of the problems raised in the background art, the present invention provides a forming device for lithium battery production and manufacturing to solve them. The following is a further elaboration of the present invention.

[0007] A forming device for lithium battery production and manufacturing, including a chassis, a connecting plate is provided on the chassis, a receiving groove is provided on the connecting plate, a bracket is provided on the connecting plate, a cylinder is connected to the bracket, the output end of the cylinder is connected to an upper fixing frame, a convex column is connected to the bottom surface of the upper fixing frame, a lower floating frame is provided below the upper fixing frame, a sliding sleeve is connected to the lower floating frame, the convex column and the sliding sleeve are slidably matched, a limiting cap is connected to one end of the convex column passing through the sliding sleeve, and a first spring is sleeved outside the convex column; a stabbing needle is connected to the bottom surface of the lower floating frame, a needle avoiding groove is provided on the connecting plate, the needle avoiding groove is below the stabbing needle, and the needle avoiding groove communicates with a vacuum pump; a sealing edge body is connected to the bottom surface of the upper fixing frame, a cutting knife is connected to the bottom of the upper fixing frame, an upper knife avoiding groove is provided on the lower floating frame, the cutting knife passes through the upper knife avoiding groove, and a lower knife avoiding groove is provided on the connecting plate, and the upper knife avoiding groove and the lower knife avoiding groove are opposite to each other.

[0008] Further, a protective pad is provided on the receiving groove to protect the lithium battery pack.

[0009] Further, a lead screw is rotatably provided on the chassis, a first motor is connected to the chassis, the lead screw is connected to the output shaft of the first motor, a moving frame is connected to the lead screw, a rotating frame is rotatably provided on the moving frame, one end of the connecting plate is rotatably connected to the rotating frame, and the other end is rotatably connected to the chassis. The inclination of the connecting plate can be controlled by the first motor.

[0010] Further, the number of the lead screws is two groups, belt pulleys are key-connected to the ends of the two lead screws, and the belt pulleys are connected by a conveyor belt. The purpose is to make the moving frame move smoothly.

[0011] Further, a weighing device is provided on the connecting plate of the moving frame, and the protective pad is connected to the weighing device. The purpose is to determine whether the electrolyte filling amount in the lithium battery pack is qualified through the weighing device, and to assist in determining whether the electrolyte fully infiltrates the electrode sheets and the separator during vacuum pumping.

[0012] Further, a second lead screw and a guide rail are rotatably provided on the bracket, a second motor is connected to the side of the bracket, the second lead screw is connected to the output shaft of the second motor, a positioning rod is horizontally connected between the second lead screw and the guide rail, the positioning rod is in threaded cooperation with the second lead screw, and the positioning rod is adapted to the receiving groove. The positioning of the position of the lithium battery pack is realized through the positioning rod, and after the edge trimming is completed, the target lithium battery pack and the waste edge material of the aluminum-plastic film are respectively unloaded and collected from the first unloading channel and the second unloading channel.

[0013] Further, a first unloading channel and a second unloading channel are connected to the connecting plate, and the first unloading channel is connected to the receiving groove. By continuously driving the positioning rod to move towards the first unloading channel side through the second lead screw, the sealed lithium battery pack is pushed out from the first unloading channel, and the waste edge material is unloaded and collected from the second unloading channel.

[0014] Further, a side frame is slidably connected to one side of the connecting plate. An extension plate is also connected to one side of the side frame. A shaft seat is fixedly connected to one side of the extension plate. A column shaft is slidably provided on the shaft seat. One end of the column shaft is connected to the side frame, and a second spring is sleeved outside the column shaft. Mounting grooves are provided on the opposite surfaces of the side frame and the extension plate for mounting the puncture needle. The puncture needle includes a needle body, a needle column, and a needle cap that are integrally connected. A third spring is sleeved outside the needle column, and both ends of the third spring contact the needle cap and the extension plate respectively. A ball groove is provided on the needle cap, and a ball is provided at the ball groove. An inclined surface is provided on the side frame, and the ball is always pressed tightly against the inclined surface under the elastic force of the third spring. A guiding support ear is connected to one side of the extension plate. A pressing member is slidably provided on the guiding support ear. A column rod is connected to the top of the pressing member, and a pressing plate is connected to the bottom. A fourth spring sleeved outside the pressing member is provided between the guiding support ear and the pressing plate. The side frame is connected to an extension rod, and one end of the extension rod extends outside the extension plate and is connected to a wedge-shaped block. The column rod is always pressed against the wedge-shaped block under the elastic force of the fourth spring. The purpose is to enable the puncture needle to retract a certain distance after piercing the aluminum-plastic film, so that there is a gap between the puncture needle and the puncture hole of the aluminum-plastic film, increasing the air flow path, and enabling the gas in the lithium battery pack to quickly escape under vacuum.

[0015] Further, a sealing strip is connected to the bottom of the lower floating frame. The sealing strip compacts and seals the periphery of the needle avoidance groove except for the position where the battery cell is located. The presence of the sealing strip reserves the space required for the lithium battery pack, preventing the lithium battery pack from being compacted and blocking the air flow escape channel.

[0016] Further, a buffer frame is connected to the bottom of the upper fixing frame. A second convex column is connected to the bottom of the buffer frame. A second sliding sleeve is connected to the top of the lower floating frame. The second convex column and the second sliding sleeve are slidably matched. A fifth spring is sleeved outside the second convex column, and the fifth spring is located between the buffer frame and the lower floating frame. The edge sealing body is connected to the buffer frame through a connecting rod. The purpose is to enable the edge sealing and trimming operations to be performed successively.

[0017] Beneficial effects: Compared with the prior art, the lithium battery production and manufacturing forming device of the present invention realizes the positioning of the placement position of the lithium battery pack through the positioning rod, and after the trimming is completed, the target lithium battery pack and the aluminum-plastic film waste edge are respectively unloaded and collected from the first unloading channel and the second unloading channel; by setting a weighing device to determine whether the electrolyte filling amount in the lithium battery pack is qualified, and assisting in determining whether the electrolyte fully wets the electrode sheets and the separator during vacuum pumping; in one pressing process, the operations of vacuum pumping, edge sealing, and trimming are successively realized. When vacuum pumping, the puncture needle can retract a certain distance after piercing the aluminum-plastic film, so that there is a gap between the puncture needle and the puncture hole of the aluminum-plastic film, increasing the air flow path and improving the vacuum pumping efficiency. Description of the Drawings

[0018] Figure 1 : Structural schematic diagram of the present invention;

[0019] Figure 2: Schematic structural diagram of the chassis;

[0020] Figure 3 : Schematic structural diagram of the connecting plate;

[0021] Figure 4 : Schematic installation structure diagram of the positioning rod;

[0022] Figure 5 : Schematic structural diagram of the upper fixing frame and the lower floating frame;

[0023] Figure 6 : Schematic structural diagram of the lower floating frame;

[0024] Figure 7 : Figure 6 Enlarged schematic diagram of the structure at position A in the figure;

[0025] Figure 8 : Schematic connection structure diagram of the side frame and the axle seat;

[0026] Figure 9 : Schematic structural diagram of the lancet;

[0027] In the figure: chassis 1, lead screw 2, pulley 3, conveyor belt 4, first motor 5, moving frame 6, rotating frame 7, connecting plate 8, receiving groove 801, needle avoiding groove 802, lower tool avoiding groove 803, protection pad 9, weighing device 10, bracket 11, second lead screw 12, guide rail 13, second motor 14, positioning rod 15, first discharge channel 16, second discharge channel 17, cylinder 18, upper fixing frame 19, convex column 20, lower floating frame 21, upper tool avoiding groove 211, sliding sleeve 22, first spring 23, lancet 24, needle body 241, needle column 242, needle cap 243, edge sealing body 25, cutter 26, side frame 27, inclined surface 271, extension plate 28, axle seat 29, column shaft 30, second spring 31, third spring 32, ball 33, guiding support ear 34, abutting member 35, column rod 36, pressing plate 37, fourth spring 38, extension rod 39, wedge block 40, sealing strip 41, buffer frame 42, second convex column 43, second sliding sleeve 44, fifth spring 45, connecting rod 46. Detailed implementation mode

[0028] Next, a specific embodiment of the present invention will be elaborated in detail with reference to the attached Figures 1-9 drawings.

[0029] Refer to the attached Figures 1-2, A forming device for lithium battery production and manufacturing, including a chassis 1. On both sides of the chassis 1, lead screws 2 are rotatably provided respectively. At the ends of the two lead screws 2, pulley wheels 3 are key-connected. The pulley wheels 3 are connected by a conveyor belt 4. A first motor 5 is also connected to the chassis 1. One of the lead screws 2 is connected to the output shaft of the first motor 5. By means of the first motor 5, the rotation of the two lead screws 2 can be synchronously controlled. A moving frame 6 is connected to the lead screw 2. A rotating frame 7 is rotatably provided on the moving frame 6. A connecting plate 8 is provided on the chassis 1. One end of the connecting plate 8 is rotatably connected to the rotating frame 7, and the other end is rotatably connected to the chassis 1. By controlling the sliding of the moving frame 6 on the lead screw 2 with the first motor 5, the inclination angle of the connecting plate 8 can be controlled.

[0030] Reference appendix Figure 1 and Figure 3 , A receiving groove 801 is provided on the connecting plate 8. The soft battery pack to be evacuated and edge-sealed is placed in this receiving groove 801. A protective pad 9 is provided on the receiving groove 801. A weighing device 10 is also provided on the connecting plate 8. The protective pad 9 is connected to the weighing device 10. When the connecting plate 8 is controlled to tilt, the soft-pack lithium battery pack placed in the receiving groove 801 on it presses the weighing device 10 under the action of its own weight, so that the weighing device 10 can convert and display the current weight of the lithium battery pack. In this way, before the lithium battery pack is evacuated, it can be determined whether the amount of electrolyte injected previously is excessive or insufficient. If the amount of electrolyte injection is unqualified, subsequent operations will not be carried out. Moreover, when the electrolyte is a low-viscosity electrolyte, the inclined lithium battery pack is not easily drawn out during evacuation.

[0031] Reference appendix Figure 1 and Figure 4 , A support 11 is provided on the connecting plate 8. A second lead screw 12 and a guide rail 13 are rotatably provided on the support 11. A second motor 14 is connected to the side of the support 11. The second lead screw 12 is connected to the output shaft of the second motor 14. A positioning rod 15 is horizontally connected between the second lead screw 12 and the guide rail 13. The positioning rod 15 is in threaded cooperation with the second lead screw 12. The positioning rod 15 is adapted to the receiving groove 801. When it is necessary to place the lithium battery pack, the second motor 14 is started. The positioning rod 15 is driven by the second lead screw 12 to move to the target position and then stops. Thereafter, the bottom edge and side wall of the lithium battery pack to be evacuated can be respectively abutted against the groove wall of the receiving groove 801 and the positioning rod 15 to complete the placement and positioning of the lithium battery.

[0032] A first discharge channel 16 and a second discharge channel 17 are connected to the connecting plate 8, and the first discharge channel 16 is connected to the accommodating groove 801. After the lithium battery pack is evacuated, edge sealing and trimming are required. Edge sealing aims to seal and press the lithium battery pack into a sealed one, and subsequent trimming is to cut the edge-sealed lithium battery pack into lithium battery packs with consistent dimensions. Currently, evacuation, edge sealing, and trimming are independent processes, which will generate target lithium battery packs and trimmed waste materials. In this embodiment, after trimming, the second motor 14 is started, and the positioning rod 15 is continuously driven by the second lead screw 12 to move towards the first discharge channel 16 side, pushing out the edge-sealed lithium battery pack from the first discharge channel 16, while the waste materials are unloaded and collected from the second discharge channel 17.

[0033] Reference appendix Figure 1 、 Figure 3 、 Figure 5 and Figure 6 At present, evacuation, edge sealing, and trimming are independent processes. In this embodiment, evacuation, edge sealing, and trimming are all integrated on the connecting plate 8 and are sequentially connected and completed. Specifically, a cylinder 18 is connected to the bracket 11, the output end of the cylinder 18 is connected to an upper fixing frame 19, a convex column 20 is connected to the bottom surface of the upper fixing frame 19, a lower floating frame 21 is provided below the upper fixing frame 19, a sliding sleeve 22 is connected to the lower floating frame 21, the convex column 20 and the sliding sleeve 22 are slidably matched, a limiting cap is connected to one end of the convex column 20 passing through the sliding sleeve 22, and a first spring 23 is sleeved outside the convex column 20, and the first spring 23 is located between the upper fixing frame 19 and the lower floating frame 21; a puncturing needle 24 is connected to the bottom surface of the lower floating frame 21, a needle-avoiding groove 802 is provided on the connecting plate 8, the needle-avoiding groove 802 is located below the puncturing needle 24, and the space of the needle-avoiding groove 802 is communicated with the vacuum pump; a edge-sealing body 25 is further connected to the bottom surface of the upper fixing frame 19, a cutting knife 26 is connected to the bottom of the upper fixing frame 19, an upper knife-avoiding groove 211 is provided on the lower floating frame 21, the cutting knife 26 passes through the upper knife-avoiding groove 211, correspondingly, a lower knife-avoiding groove 803 is provided on the connecting plate 8, and the upper knife-avoiding groove 211 and the lower knife-avoiding groove 803 are opposite to each other.

[0034] After the lithium battery pack is placed, the cylinder 18 acts to drive the lower floating frame 21 to descend. The puncturing needle 24 first contacts the aluminum plastic film of the lithium battery pack (avoiding the battery core) and punctures it. The puncturing needle 24 enters the needle-avoiding groove 802 until the lower floating frame 21 contacts the connecting plate 8, and then the vacuum pump is started. A vacuum is formed at the needle-avoiding groove 802, and the lithium battery pack is evacuated through the puncture holes on the aluminum plastic film. Under the scheme of this embodiment, the air flow path is realized by making destructive punctures on the aluminum plastic film, which is different from the prior art process of reserving air bags, and has the advantages of simpler process and higher evacuation efficiency.

[0035] Reference appendix Figures 6-9, Further, a side frame 27 is slidably connected to one side of the connecting plate 8. An extension plate 28 is also connected to one side of the side frame 27. A shaft seat 29 is fixedly connected to one side of the extension plate 28. A column shaft 30 is slidably arranged on the shaft seat 29. One end of the column shaft 30 is connected to the side frame 27, and a second spring 31 is sleeved outside the column shaft 30. Installation grooves are provided on the opposite surfaces of the side frame 27 and the extension plate 28 for installing the puncturing needle 24. The puncturing needle 24 includes a needle body 241, a needle column 242 and a needle cap 243 which are integrally connected. After the side frame 27 and the extension plate 28 are connected, components such as the side frame 27, the shaft seat 29, the column shaft 30 and the second spring 31 can be built in, which is convenient for assembly. After installation, the needle cap 243 is located in the installation groove, and a third spring 32 is sleeved outside the needle column 242. Both ends of the third spring 32 are respectively in contact with the needle cap 243 and the extension plate 28. A ball groove is provided on the needle cap 243, and a ball 33 with a degree of rotational freedom is provided at the ball groove. An inclined surface 271 is provided on the side frame 27, and the ball 33 is always pressed tightly against the inclined surface 271 under the elastic force of the third spring 32. A guiding support ear 34 is connected to one side of the extension plate 28. A resisting member 35 is slidably arranged on the guiding support ear 34. A column rod 36 is connected to the top of the resisting member 35, and a pressing plate 37 is connected to the bottom. A fourth spring 38 sleeved outside the resisting member 35 is provided between the guiding support ear 34 and the pressing plate 37. The side frame 27 is connected with an extension rod 39. One end of the extension rod 39 extends outside the extension plate 28 and is connected with a wedge-shaped block 40. The column rod 36 is always pressed against the wedge-shaped block 40 under the elastic force of the fourth spring 38.

[0036] When the lower floating frame 21 descends, the puncturing needle 24 first pierces the aluminum-plastic film. The lower floating frame 21 continues to descend until the resisting member 35 contacts the connecting plate 8 and stops. The lower floating frame 21 continues to descend, the fourth spring 38 is compressed, and the resisting member 35 presses the wedge-shaped block 40 to force the side frame 27 to slide a short distance in the direction away from the resisting member 35. When the side frame 27 slides laterally, the second spring 31 is compressed. At the same time, the ball 33 rolls on the inclined surface 271 of the side frame 27, and the puncturing needle 24 moves up a short distance under the elastic force of the third spring 32 until the lower floating frame 21 is pressed tightly on the connecting plate 8. The purpose is to make the puncturing needle 24 retract a certain distance after piercing the aluminum-plastic film, so that there is a gap between it and the puncture hole of the aluminum-plastic film, increasing the air flow passage, so that the gas in the lithium battery pack can quickly escape under vacuum.

[0037] Reference appendix Figure 6 , To maintain the edge-sealing component of the needle-avoiding groove 802 during vacuum pumping, a sealing strip 41 is connected to the bottom of the lower floating frame 21. The sealing strip 41 compacts and seals the periphery of the needle-avoiding groove 802 except for the position where the battery cell is located. The existence of the sealing strip 41 reserves the space required for the aluminum-plastic film of the lithium battery pack, and avoids the aluminum-plastic film of the lithium battery pack being compacted to block the gas escape channel.

[0038] Reference appendix Figure 5After the vacuuming is completed, the cylinder 18 continues to move, driving the upper fixed frame 19 to continue to descend. At this time, the lower floating frame 21 is pressed against the connecting plate 8 and is stationary. The upper fixed frame 19 continues to descend to complete the edge sealing and edge trimming operations. In this embodiment, the edge sealing operation is preferably performed first and the edge trimming operation is performed later. Specifically: the bottom of the upper fixed frame 19 is connected to a buffer frame 42, the bottom of the buffer frame 42 is connected to a second boss 43, the top of the lower floating frame 21 is connected to a second sleeve 44, the second boss 43 and the second sleeve 44 are slidably matched, the outer sleeve of the second boss 43 is provided with a fifth spring 45, the fifth spring 45 is located between the buffer frame 42 and the lower floating frame 21, and the edge sealing body 25 is connected to the buffer frame 42 through a connecting rod 46.

[0039] After vacuuming, the lower floating frame 21 is pressed against the connecting plate 8 and remains stationary, and the cylinder 18 continues to move, driving the upper fixed frame 19 to continue to descend. While the edge sealing body 25 continues to descend, the fifth spring 45 and the first spring 23 are compressed until the edge sealing body 25 is pressed against the aluminum-plastic film, forming a final sealing edge on the aluminum-plastic film. At this time, the lithium battery cell body is completely sealed all around; thereafter, the cylinder 18 drives the upper fixed frame 19 to continue to descend, the first spring 23 is further compressed, and the cutter 26 descends and cuts into the lower knife avoidance groove 803 to cut off the excess aluminum-plastic film of the lithium battery pack.

[0040] The working principle of the molding device for lithium battery production of the present invention is as follows:

[0041] In the initial state, the connecting plate 8 is in a horizontal state, the cylinder does not move, the upper fixed frame 19 and the lower floating frame 21 are suspended, and the positioning rod 15 is close to the side;

[0042] Calibrate the position of the lithium battery pack. The first motor 5 controls the two screw rods 2 to rotate, and the moving frame 6 moves on the screw rods 2, thereby controlling the tilt angle of the connecting plate 8. The second motor 14 is started, and the positioning rod 15 is driven by the second screw rod 12 to move to the target position and then stop. The lithium battery pack is placed in the receiving groove 801 on the inclined connecting plate 8. The bottom of the battery body of the lithium battery pack is against the protective pad 9, and the side is against the positioning rod 15. The placement and positioning of the lithium battery is completed. The displayed value of the weighing device 10 is used to judge whether the current injection amount of the electrolyte in the lithium battery pack is qualified. If it is unqualified, it is taken out. If it is qualified, the next step is performed;

[0043] Vacuum pumping: After the lithium battery pack is placed, the second motor 14 starts to drive the positioning rod 15 to reset. The cylinder 18 acts to drive the lower floating frame 21 to descend. The puncture needle 24 first contacts the aluminum-plastic film of the lithium battery pack and punctures it, and the puncture needle 24 enters the needle avoidance groove 802. The cylinder 18 drives the lower floating frame 21 to continue descending. The abutting member 35 squeezes the wedge-shaped block 40 to force the side frame 27 to slide a short distance in the direction away from the abutting member 35. When the side frame 27 slides laterally, the second spring 31 is compressed. At the same time, the ball 33 rolls on the inclined surface 271 of the side frame 27, and the puncture needle 24 moves upward a short distance under the elastic force of the third spring 32, so that the puncture needle 24 can retract a certain distance after puncturing the aluminum-plastic film, creating a gap between the puncture needle 24 and the puncture hole of the aluminum-plastic film, increasing the air flow path. Until the lower floating frame 21 contacts the connecting plate 8, then the vacuum pump starts, and a vacuum is formed at the needle avoidance groove 802, and the electrolyte is vacuum pumped through the puncture holes in the aluminum-plastic film. During vacuum pumping, the display value of the weighing device 10 can be observed to judge whether the electrolyte in the current lithium battery pack fully wets the electrode sheets and the separator. If the display value of the weighing device 10 suddenly changes, it can be considered that the electrolyte does not fully wet the electrode sheets and the separator and is pumped out by the vacuum.

[0044] Edge sealing: The cylinder 18 continues to act, driving the upper fixing frame 19 to continue descending. While the edge sealing body 25 continues to descend, the fifth spring 45 and the first spring 23 are compressed until the edge sealing body 25 presses tightly on the aluminum-plastic film, forming the final sealing edge on the aluminum-plastic film. At this time, the periphery of the lithium battery cell body is completely sealed.

[0045] Edge cutting: The cylinder 18 drives the upper fixing frame 19 to continue descending, and the first spring 23 is further compressed. The cutting knife 26 descends and cuts into the lower knife avoidance groove 803 to cut off the excess aluminum-plastic film of the lithium battery pack.

[0046] Discharging: The cylinder acts to drive the upper fixing frame 19 and the lower floating frame 21 to rise and reset. The second motor 14 starts again, driving the positioning rod 15 to move towards the first discharge channel 16 side, pushing out the target lithium battery pack obtained after edge cutting from the first discharge channel 16, and the waste edge material of the aluminum-plastic film obtained by cutting is unloaded and collected from the second discharge channel 17.

[0047] The forming device for lithium battery production and manufacturing of the present invention realizes the positioning of the position of the lithium battery pack through the positioning rod, and after edge cutting, the target lithium battery pack and the waste edge material of the aluminum-plastic film are respectively unloaded and collected from the first discharge channel and the second discharge channel; the weighing device is set to judge whether the electrolyte injection volume in the lithium battery pack is qualified, and to assist in judging whether the electrolyte fully wets the electrode sheets and the separator during vacuum pumping; in one pressing process, vacuum pumping, edge sealing and edge cutting operations are successively realized. During vacuum pumping, the puncture needle can retract a certain distance after puncturing the aluminum-plastic film, creating a gap between the puncture needle and the puncture hole of the aluminum-plastic film, increasing the air flow path and improving the vacuum pumping efficiency.

[0048] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A forming device for lithium battery production, comprising a base frame (1), a connecting plate (8) being provided on the base frame (1), characterized in that: The connecting plate (8) is provided with a receiving groove (801), the connecting plate (8) is provided with a bracket (11), the bracket (11) is connected to a cylinder (18), the output end of the cylinder (18) is connected to an upper fixing frame (19), the bottom surface of the upper fixing frame (19) is connected to a boss (20), a lower floating frame (21) is provided below the upper fixing frame (19), a sliding sleeve (22) is connected to the lower floating frame (21), the boss (20) and the sliding sleeve (22) are slidably matched, one end of the boss (20) passing through the sliding sleeve (22) is connected to a limiting cap, and a first spring (23) is provided on the outer sleeve of the boss (20); The bottom surface of the lower floating frame (21) is connected to a needle (24); the connecting plate (8) is provided with a needle avoidance groove (802); the needle avoidance groove (802) is located below the needle (24); and the needle avoidance groove (802) is connected to a vacuum pump; the bottom surface of the upper fixed frame (19) is connected to an edge sealing body (25); the bottom of the upper fixed frame (19) is connected to a cutting knife (26); the lower floating frame (21) is provided with an upper knife avoidance groove (211); the cutting knife (26) passes through the upper knife avoidance groove (211); and the connecting plate (8) is provided with a lower knife avoidance groove (803); the upper knife avoidance groove (211) and the lower knife avoidance groove (803) are directly opposite.

2. The forming device for lithium battery production according to claim 1, characterized in that: A protection pad (9) is provided on the accommodating groove (801).

3. The forming device for lithium battery manufacturing according to claim 2, characterized in that: A screw rod (2) is rotatably provided on the base frame (1), a first motor (5) is connected to the base frame (1), the screw rod (2) is connected to the output shaft of the first motor (5), a moving frame (6) is connected to the screw rod (2), a rotating frame (7) is rotatably provided on the moving frame (6), and one end of the connecting plate (8) is rotatably connected to the rotating frame (7), and the other end is rotatably connected to the base frame (1).

4. The forming device for lithium battery manufacturing according to claim 3, characterized in that: The screw rods (2) are provided in two groups, and the ends of the two screw rods (2) are key-connected with pulleys (3), and the pulleys (3) are connected via a conveyor belt (4).

5. The forming device for lithium battery manufacturing according to claim 3, characterized in that: A weighing device (10) is provided on the connecting plate (8), and the protection pad (9) is connected to the weighing device (10).

6. The forming device for lithium battery manufacturing according to claim 5, characterized in that: A second screw rod (12) and a guide rail (13) are rotatably provided on the bracket (11); a second motor (14) is connected to the side of the bracket (11); the second screw rod (12) is connected to the output shaft of the second motor (14); a positioning rod (15) is horizontally connected between the second screw rod (12) and the guide rail (13); the positioning rod (15) is threadedly matched with the second screw rod (12); and the positioning rod (15) is adapted to the accommodating groove (801).

7. The forming device for lithium battery manufacturing according to claim 6, characterized in that: The connecting plate (8) is connected to a first discharge channel (16) and a second discharge channel (17), and the first discharge channel (16) is connected to the accommodating groove (801).

8. The forming device for lithium battery manufacturing according to claim 6, characterized in that: One side of the connecting plate (8) is slidably connected to a side frame (27), one side of the side frame (27) is also connected to an extension plate (28), one side of the extension plate (28) is fixedly connected to an axle seat (29), a column shaft (30) is slidably provided on the axle seat (29), one end of the column shaft (30) is connected to the side frame (27), and a second spring (31) is provided on the outer sleeve of the column shaft (30); opposite surfaces of the side frame (27) and the extension plate (28) are provided with a mounting groove for mounting a puncture needle (24), the puncture needle (24) comprising a needle body (241), a needle column (242) and a needle cap (243) connected in one piece, the needle column (242) is provided with a third spring (32), two ends of the third spring (32) respectively contact the needle cap (243) and the extension plate (28); the needle cap (243) is provided with a ball groove, and the ball groove is provided at the inner sleeve of the needle cap (243). A ball (33) is provided, and an inclined surface (271) is provided on the side frame (27). The ball (33) is always pressed against the inclined surface (271) under the elastic force of the third spring (32); a guide ear (34) is connected to one side of the extension plate (28), and a supporting member (35) is slidably provided on the guide ear (34). The top of the supporting member (35) is connected to a column rod (36), and the bottom is connected to a pressure plate (37). A fourth spring (38) is provided between the guide ear (34) and the pressure plate (37) and is sleeved outside the supporting member (35). The side frame (27) is connected to an extension rod (39), one end of the extension rod (39) extends outside the extension plate (28) and is connected to a wedge block (40). The column rod (36) is always pressed against the wedge block (40) under the elastic force of the fourth spring (38).

9. The forming device for lithium battery manufacturing according to claim 8, characterized in that: A sealing strip (41) is connected to the bottom of the lower floating frame (21).

10. The forming device for lithium battery manufacturing according to claim 8, characterized in that: The bottom of the upper fixed frame (19) is connected to a buffer frame (42), the bottom of the buffer frame (42) is connected to a second boss (43), the top of the lower floating frame (21) is connected to a second sliding sleeve (44), the second boss (43) and the second sliding sleeve (44) are slidably matched, the outer sleeve of the second boss (43) is provided with a fifth spring (45), the fifth spring (45) is located between the buffer frame (42) and the lower floating frame (21), and the edge sealing body (25) is connected to the buffer frame (42) through a connecting rod (46).

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