A vacuum heat-sealing device for soft-pack lithium batteries

Abstract

The present invention relates to the technical field of lithium battery production, and specifically provides a vacuum heat-sealing device for soft-pack lithium batteries. It includes a vacuum chamber, a conveying mechanism, a pressing mechanism, a puncturing mechanism, an electrolyte absorption mechanism, an upper and lower heat-sealing mechanism, an auxiliary bearing mechanism, and a roller mechanism. The operations of the pressing mechanism, the puncturing mechanism, the electrolyte absorption mechanism, and the upper and lower heat-sealing mechanism are all completed inside the vacuum chamber. The present invention can pump out the air in the soft-pack lithium battery more thoroughly, and at the same time, there is no need to worry about new air mixing in. Moreover, it can ensure that the aluminum-plastic film is randomly encapsulated as much as possible without pumping out the electrolyte, guaranteeing the subsequent performance of the battery.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery production, and specifically provides a vacuum heat sealing device for soft-pack lithium batteries. Background Art

[0002] Soft-pack lithium batteries are packaged with aluminum-plastic films in terms of structure. In the case of potential safety hazards, the soft-pack batteries will at most bulge and crack. Now they are widely used in the field of electric vehicles. The encapsulation of the battery cores of soft-pack lithium batteries and the outer aluminum-plastic films usually adopts vacuum encapsulation. Through processes such as puncturing the aluminum-plastic film, vacuum pumping, and heat sealing, the existing technology for heat sealing soft-pack lithium batteries seals and evacuates the air up and down at the punctured part of the aluminum-plastic film. If the up and down sealing mechanisms are prone to deviation in this way, the air in the lithium battery cannot be evacuated. During subsequent heat sealing, due to the air remaining in the lithium battery, on the one hand, it affects the appearance of the lithium battery, and on the other hand, it will affect the performance of the lithium battery. Summary of the Invention

[0003] The technical problem solved by the present invention is to provide a heat sealing device for soft-pack lithium batteries in a vacuum environment.

[0004] The technical solution adopted by the present invention to solve its technical problems is:

[0005] A vacuum heat sealing device for soft-pack lithium batteries, comprising:

[0006] A vacuum chamber for providing a working environment for vacuum heat sealing, and the vacuum chamber is provided with a viewing window assembly for viewing the internal work;

[0007] A conveying mechanism for conveying a carrier loaded with a soft-pack lithium battery into the vacuum chamber and sealing it with the vacuum chamber;

[0008] A pressing mechanism for further pressing and fixing the soft-pack lithium battery conveyed by the conveying mechanism, fixing the battery core of the soft-pack lithium battery and the aluminum-plastic film wrapping the battery core in the carrier, and waiting for subsequent operations;

[0009] A puncturing mechanism, with a puncturing assembly arranged at the lower end, and the puncturing assembly is provided with a plurality of puncturing terminals. The puncturing mechanism presses down to puncture the aluminum-plastic film encapsulating the battery core through the puncturing terminals;

[0010] The electrolyte absorption mechanism is provided with a suction cup assembly corresponding to the puncturing assembly at the upper end. The suction cup assembly is provided with a plurality of suction cups. The plurality of suction cups are vertically corresponding to the puncturing terminals. The lower ends of the plurality of suction cups are connected with a liquid discharge pipe. The electrolyte absorption mechanism moves upward. When the plurality of suction cups contact the lower part of the aluminum-plastic film of the soft-pack lithium battery, the electrolyte absorption mechanism stops moving. The plurality of suction cups adsorb the aluminum-plastic film, waiting for the puncturing mechanism to press down to puncture the aluminum-plastic film. After the aluminum-plastic film is punctured, the vacuum chamber starts to pump out the air, pumping out the gas inside the aluminum-plastic film. At the same time, the plurality of suction cups suck away the electrolyte that may flow out from the battery core in the aluminum-plastic film;

[0011] The heat-sealing mechanism includes an upper heat-sealing mechanism and a lower heat-sealing mechanism. The upper heat-sealing mechanism and the lower heat-sealing mechanism are vertically corresponding to heat-seal the aluminum-plastic film of the soft-pack lithium battery after sucking away air and water;

[0012] The operations of the pressing mechanism, the puncturing mechanism, the electrolyte absorption mechanism and the heat-sealing mechanism are all completed inside the vacuum chamber.

[0013] Further, the puncturing terminal includes a puncturing needle and a movable bushing. The puncturing needle is fixedly arranged at the lower end of the puncturing assembly. The movable bushing wraps the lower end of the puncturing needle and can slide up and down. The outer diameter of the movable bushing is slightly smaller than the inner diameter of the suction cup. When the suction cup on the electrolyte absorption mechanism contacts the lower end of the aluminum-plastic film of the soft-pack lithium battery, the suction cup adsorbs the aluminum-plastic film. The puncturing mechanism drives the puncturing assembly to move downward. The movable bushing first contacts the aluminum-plastic film adsorbed above the suction cup. The movable bushing is blocked by the aluminum-plastic film. The puncturing assembly drives the puncturing needle to continue moving downward for a certain distance to puncture the aluminum-plastic film. The movable bushing presses the punctured aluminum-plastic film above the suction cup. The vacuum chamber starts to pump out the air, pumping out the air inside the aluminum-plastic film. At the same time, the suction cup sucks the electrolyte flowing out due to the vacuum pumping of the battery core and discharges it through the liquid discharge pipe.

[0014] Further, the puncturing assembly further includes a convex guiding shaft, and the convex guiding shaft is arranged at the left and right ends of the plurality of puncturing terminals; the suction cup assembly further includes a concave guiding shaft corresponding to the convex guiding shaft up and down. The convex end at the lower end of the convex guiding shaft is inserted into the groove at the upper end of the concave guiding shaft to complete the guiding and positioning between the puncturing mechanism and the electrolyte absorption mechanism.

[0015] Further, the vacuum chamber further includes a pressure sensor, an air extraction port, and a heater inlet and outlet. The air extraction port extracts the air inside the vacuum chamber to form a vacuum working environment. The heater inlet and outlet are used for loading the inlet and outlet of the heater heat source. The pressure sensor monitors the pressure data inside the vacuum chamber. When the pressure value inside the vacuum chamber reaches the set value, the heat sealing mechanism starts to perform the up and down heat sealing actions to heat seal the aluminum-plastic film. Preferably, the viewing window assembly includes a transparent sealing plate. The transparent sealing plate is hermetically connected to the box body of the vacuum chamber through a sealing ring, and then is hermetically fixed to the vacuum chamber by pressing several viewing window switches on the vacuum chamber. A detachable handle is provided on the transparent sealing plate.

[0016] Further, the conveying mechanism includes a sealing push plate, a conveying plate, and a first pressing block assembly. The carrier is fixed at the front part of the upper end of the conveying plate and is used for loading the soft-pack lithium battery to be heat-sealed. The conveying plate is vertically fixed to the sealing push plate. The first pressing block assembly is arranged at the rear part of the upper end of the conveying plate and is used to press the soft-pack lithium battery in the carrier. The sealing push plate pushes the conveying plate into the vacuum chamber and is fixed to the vacuum chamber. The sealing push plate is sealed with the vacuum chamber through a sealing ring.

[0017] Further, heat sealing knives are respectively arranged above and below the upper heat sealing mechanism and the lower heat sealing mechanism. The upper and lower heat sealing knives are heated by a cartridge heater to heat seal the aluminum-plastic film. Insulating plates are arranged on both sides of the upper and lower heat sealing knives. Temperature sensors for monitoring the temperature are arranged on both the upper and lower heat sealing mechanisms.

[0018] Further, an auxiliary bearing mechanism is further included, which is used to bear the weight of the electrolyte absorption mechanism to prevent damage to the electrolyte absorption mechanism caused by excessive downward pressure of the puncturing mechanism.

[0019] Further, a roller mechanism is fixed near the lower end of the conveying mechanism inside the vacuum chamber to facilitate the smooth and stable conveyance of the soft-pack lithium battery into the vacuum chamber by the conveying mechanism.

[0020] Preferably, a plurality of fixing seats are arranged around the vacuum chamber.

[0021] The beneficial effects of the present invention are:

[0022] 1. By adopting a vacuum chamber, the heat sealing process is completed in a vacuum environment, and the air in the soft-pack lithium battery can be pumped out more cleanly, and at the same time, there is no need to worry about the mixing of air.

[0023] 2. The vacuum chamber is provided with a pressure sensor. Through repeated tests, it can ensure that while not pumping out the electrolyte of the battery core, the aluminum-plastic film is encapsulated immediately, ensuring the subsequent performance of the battery. Description of the Drawings

[0024] Figure 1 This is the three-dimensional structure diagram of the present invention;

[0025] Figure 2 is Figure 1 the internal structure diagram of;

[0026] Figure 3 is Figure 2 the side view of;

[0027] Figure 4 is Figure 3 the structure diagram marked as 2 in;

[0028] Figure 5 is Figure 3 the structure diagrams marked as 2 and 3 in;

[0029] Figure 6 is Figure 3 the structure diagram marked as 4 in;

[0030] Figure 7 is Figure 3 the structure diagram marked as 5 in;

[0031] Figure 8 is Figure 3 the partial structure diagram marked as 6 in;

[0032] Figure 9 is Figure 3 the structure diagram marked as 7 in;

[0033] The markings in the figure are:

[0034] 1. Vacuum box, 1.1. View window assembly, 1.11. Transparent sealing plate, 1.12. View window switch, 1.2. Pressure sensor, 1.3. Air extraction port, 1.4. Heater inlet and outlet, 1.5. Fixed seat;

[0035] 2. Conveying mechanism, 2.1. Sealing push plate, 2.2. Conveying plate, 2.3. First pressing block assembly, 2.4. Carrier;

[0036] 3. Pressing mechanism, 3.1. Second pressing block, 3.2. Buffer column;

[0037] 4. Piercing mechanism, 4.1. Piercing assembly, 4.11 Piercing terminal, 4.111. Piercing needle, 4.112. Movable bushing, 4.12. Raised guide shaft;

[0038] 5. Electrolyte absorption mechanism, 5.1. Suction cup assembly, 5.11. Suction cup, 5.12. Concave guide shaft;

[0039] 6. Heat sealing mechanism, 6-1. Upper heat sealing mechanism, 6-2. Lower heat sealing mechanism, 6.1. Heat sealing knife, 6.2. Cylindrical heater, 6.3. Insulating board, 6.4. Temperature sensor;

[0040] 7. Auxiliary bearing mechanism, 7.1. Support base, 8. Roller mechanism. Specific implementation manner

[0041] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the specific implementation manner of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0042] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0044] A vacuum heat sealing device for soft-pack lithium batteries, as Figure 1 and Figure 2 shown, includes a vacuum chamber 1 for providing a working environment for vacuum heat sealing. The vacuum chamber 1 is provided with a viewing window assembly 1.1 for viewing the internal work;

[0045] A conveying mechanism 2 for conveying a carrier 2.4 containing a soft-pack lithium battery into the vacuum chamber 1 and sealing it with the vacuum chamber 1;

[0046] A pressing mechanism 3 for further pressing and fixing the soft-pack lithium battery conveyed by the conveying mechanism 2, fixing the battery core of the soft-pack lithium battery and the aluminum-plastic film wrapping the battery core in the carrier 2.4, and waiting for subsequent operations;

[0047] A puncturing mechanism 4, with a puncturing assembly 4.1 provided at the lower end. The puncturing assembly 4.1 is provided with a plurality of puncturing terminals 4.11. The puncturing mechanism 4 presses down to puncture the aluminum-plastic film encapsulating the battery core through the puncturing terminals 4.11;

[0048] The electrolyte absorption mechanism 5 is provided with a suction cup assembly 5.1 corresponding to the puncturing assembly 4.1 at the upper end. The suction cup assembly 5.1 is provided with a plurality of suction cups 5.11. The plurality of suction cups 5.11 are vertically corresponding to the puncturing terminals 4.11. A drain pipe is connected to the lower ends of the plurality of suction cups 5.11. The electrolyte absorption mechanism 5 moves upward. When the plurality of suction cups 5.11 contact the lower part of the aluminum-plastic film of the soft-pack lithium battery, the electrolyte absorption mechanism 5 stops moving. The plurality of suction cups 5.11 adsorb the aluminum-plastic film and wait for the puncturing mechanism 4 to press down to puncture the aluminum-plastic film. After the aluminum-plastic film is punctured, the vacuum chamber 1 starts to evacuate, pumping out the gas inside the aluminum-plastic film. At the same time, the plurality of suction cups 5.11 suck away the electrolyte that may flow out from the battery core in the aluminum-plastic film;

[0049] The heat-sealing mechanism 6 includes an upper heat-sealing mechanism 6-1 and a lower heat-sealing mechanism 6-2. The upper heat-sealing mechanism 6-1 and the lower heat-sealing mechanism 6-2 are vertically corresponding to heat-seal the aluminum-plastic film of the soft-pack lithium battery after sucking away air and water;

[0050] The operations of the pressing mechanism 3, the puncturing mechanism 4, the electrolyte absorption mechanism 5, and the heat-sealing mechanism 6 are all completed inside the vacuum chamber 1.

[0051] As Figure 1 shown, the vacuum chamber 1 includes a viewing window assembly 1.1 for viewing the internal work, a pressure sensor 1.2, an air extraction port 1.3, a heater inlet and outlet 1.4, and a plurality of fixing seats 1.5. The viewing window assembly 1.1 includes a transparent sealing plate 1.11 and a plurality of viewing window switches 1.12. The plurality of viewing window switches 1.12 are fixed at the front end of the vacuum chamber 1 to fix and seal the transparent sealing plate 1.11 to the vacuum chamber 1. The transparent sealing plate 1.11 and the vacuum chamber 1 are sealed by a sealing ring. In order to facilitate the disassembly of the transparent sealing plate 1.11, a handle for easy removal is provided at the front end of the transparent sealing plate. On the one hand, the transparent sealing plate 1.11 can facilitate the staff to view the working environment inside the vacuum chamber in real time. On the other hand, taking out the transparent sealing plate 1.11 later can facilitate the replacement and repair of the internal mechanism. The pressure sensor 1.2 monitors the pressure data inside the vacuum chamber 1. After the puncturing mechanism 4 punctures the aluminum-plastic film of the soft-pack lithium battery, the vacuum chamber 1 evacuates the air inside the vacuum chamber 1 through the air extraction port 1.3. When the pressure value inside the vacuum chamber 1 reaches the set value, it guides the upper and lower heat-sealing mechanisms 6 to start the heat-sealing action to heat-seal the aluminum-plastic film of the soft-pack lithium battery. The air extraction port 1.3 is provided with two, which are respectively arranged on the left and right sides of the vacuum chamber 1. The heater inlet and outlet 1.4 is used for loading the inlet and outlet of the heater heat source. The vacuum chamber 1 is fixed on the workbench through a plurality of fixing seats 1.5 around it.

[0052] As Figure 2 and Figure 3As shown in the figure, the conveying mechanism 2 is arranged at the rear end of the vacuum chamber 1, and the pressing mechanism 3 is arranged at the upper end of the conveying mechanism 2. Above and below the front end of the pressing mechanism 3, relative to the conveying mechanism 2, there are upper and lower heat-sealing mechanisms 6. Above and below the front end of the upper and lower heat-sealing mechanisms 6, there are a puncturing mechanism 4 and an electrolyte absorption mechanism 5. At the rear end inside the vacuum chamber 1, there is a roller mechanism 8 facilitating the conveyance of the conveying mechanism 2, which conveniently and smoothly conveys the carrier equipped with the soft-pack lithium battery into the vacuum chamber 1.

[0053] As Figure 4 shown in the figure, it is a three-dimensional structure diagram of the conveying mechanism 2, including a sealing push plate 2.1, a conveying plate 2.2, a first pressing block assembly 2.3, and a carrier 2.4. The conveying plate 2.2 is vertically fixed at the front end of the sealing push plate 2.1. On the upper surface of the front end of the conveying plate 2.2, there is a carrier 2.4, in which there is a soft-pack lithium battery to be evacuated and heat-sealed. Behind the carrier 2.4, there is a first pressing block assembly 2.3, which is fixed on the conveying plate to press the rear end of the aluminum-plastic film of the soft-pack lithium battery in the carrier 2.4. The front end of the aluminum-plastic film of the soft-pack lithium battery protrudes from the front end of the carrier 2.4, facilitating puncturing and heat-sealing. The sealing push plate 2.1 is smoothly pushed into the vacuum chamber 1 through the roller mechanism 8 inside the vacuum chamber 1. The sealing push plate 2.1 is sealed with the vacuum chamber 1 through a sealing ring, and then the sealing push plate 2.1 is fixed at the rear end of the vacuum chamber 1.

[0054] As Figure 5 shown in the figure, it is a three-dimensional structure diagram of the conveying mechanism 2 and the pressing mechanism 3. The pressing mechanism 3 includes a second pressing block 3.1 and a buffer column 3.2. After the conveying mechanism 2 conveys the carrier equipped with the soft-pack lithium battery into the vacuum chamber 1, the pressing mechanism 3 is driven by a cylinder to move the second pressing block 3.1 downward to press the battery core and the aluminum-plastic film of the soft-pack lithium battery in the carrier 2.4. On both sides of the second pressing block 3.1, there are buffer columns 3.2, which can smoothly press the battery core and the aluminum-plastic film of the lithium battery in the carrier through the second pressing block 3.1. The cylinder of the pressing mechanism 3 is arranged at the upper end of the vacuum chamber 1 body, and drives the second pressing block 3.1 to move up and down in the vacuum chamber 1 through two shaft rods. The two shaft rods are connected to the upper end of the vacuum chamber body through sealed bearings.

[0055] As Figure 6As shown in the figure, it is a three-dimensional structure diagram of the piercing mechanism 4, including a piercing component 4.1, which is driven by a cylinder to move up and down. The piercing component 4.1 includes several piercing terminals 4.11 and the convex guiding shafts 4.12 at its left and right ends. The piercing terminal 4.11 includes a piercing needle 4.111 and a movable bushing 4.112. The piercing needle 4.111 is fixedly arranged at the lower end of the piercing component 4.1. The movable bushing 4.112 wraps the lower end of the piercing needle 4.111 and can slide up and down. The outer diameter of the movable bushing 4.112 is slightly smaller than the inner diameter of the suction cup 5.11. When the suction cup 5.11 on the electrolyte absorption mechanism 5 contacts the lower end of the aluminum-plastic film of the soft-pack lithium battery, the suction cup 5.11 adsorbs the aluminum-plastic film. The piercing mechanism 4 drives the piercing component 4.1 to move downward. The movable bushing 4.112 first contacts the aluminum-plastic film adsorbed above the suction cup 5.11. The movable bushing 4.112 is blocked by the aluminum-plastic film. The piercing component 4.11 drives the piercing needle 4.111 to continue moving downward for a certain distance to pierce the aluminum-plastic film. The movable bushing 4.112 presses the pierced aluminum-plastic film above the suction cup 5.11. The vacuum chamber 1 starts to evacuate, pumping out the air in the aluminum-plastic film. At the same time, the suction cup 5.11 absorbs the electrolyte flowing out of the battery cell due to the evacuation and discharges it through the drain pipe. The driving mechanism of the piercing mechanism 4 is arranged at the upper end of the vacuum chamber 1 body through a sealed bearing in the same way as the pressing mechanism 3.

[0056] As Figure 7 shown in the figure, it is a three-dimensional structure diagram of the electrolyte absorption mechanism 5, including a suction cup component 5.1, which is driven by a cylinder to move up and down. The suction cup component 5.1 includes several suction cups 5.11 and the concave guiding shafts 5.12 at the left and right ends of several suction cups 5.11. Several suction cups 5.11 correspond to several piercing terminals 4.11 on the piercing mechanism 4 up and down. The piercing terminal 4.11 can be inserted into the suction cup 5.11. A drain pipe is connected below the suction cup 5.1 for discharging the electrolyte that may flow out of the battery cell when the lithium battery is evacuated. The left and right convex guiding shafts 4.12 at the lower end of the piercing component 4.1 correspond to the left and right concave guiding shafts 5.12 at the upper end of the suction cup component 5.1 up and down. The convex ends at the lower ends of the left and right convex guiding shafts 4.12 are inserted into the grooves at the upper ends of the left and right concave guiding shafts 5.12 to complete the guiding and positioning of the piercing mechanism 4 and the electrolyte absorption mechanism 5. The driving mechanism of the electrolyte absorption mechanism 5 is arranged at the lower end of the vacuum chamber 1 body through a sealed bearing in the same way as the pressing mechanism 3.

[0057] As Figure 8As shown in the figure, it is the structural diagram of the heat-sealing cutter head of the upper and lower heat-sealing mechanisms 6. The upper heat-sealing mechanism 6-1 and the lower heat-sealing mechanism 6-2 are respectively provided with heat-sealing knives 6.1 for heat-sealing the aluminum-plastic film up and down. They are driven by cylinders to move up and down. The upper and lower heat-sealing knives 6.1 are heated by a cylindrical heater 6.2, and then the heat is transmitted to the aluminum-plastic film through the heat-sealing knives 6.1, so as to realize the heat-sealing of the aluminum-plastic film. Insulating plates 6.2 are fixed on both sides of the upper and lower heat-sealing knives 6.1. At the same time, temperature sensors 6.4 for detecting temperature are arranged on the upper and lower heat-sealing cutter heads. The temperature sensors 6.4 are used to record the temperature of the upper and lower heat-sealing cutter heads, so as to accurately control the temperature of the upper and lower heat-sealing cutter heads and realize better heat-sealing of the aluminum-plastic film by the upper and lower heat-sealing knives. The driving mechanism of the upper heat-sealing mechanism 6-1 is arranged at the upper end of the vacuum chamber 1 box body through a sealed bearing in the same way as the pressing mechanism 3. The driving mechanism of the lower hot air mechanism 6-2 is arranged at the lower end of the vacuum chamber 1 box body through a sealed bearing in the same way as the pressing mechanism 3. The heat source of the upper and lower heat-sealing mechanisms 6 is transmitted in through the heater inlet and outlet 1.4 on the vacuum chamber 1.

[0058] As Figure 9 shown in the figure, it is the three-dimensional structural diagram of the auxiliary bearing mechanism 7. The auxiliary bearing mechanism 7 is arranged below the cylinder of the electrolyte absorption mechanism 5 and is used to bear the weight of the electrolyte absorption mechanism 5 to prevent the cylinder of the electrolyte absorption mechanism 5 from being crushed. The auxiliary bearing mechanism 7 includes a support seat 7.1, which is driven by a cylinder to move back and forth on the slide rail. When the electrolyte absorption mechanism 5 moves upward to adsorb and fix the aluminum-plastic film of the lithium battery, the support seat 7.1 on the auxiliary bearing mechanism 7 is driven by the cylinder to move forward to the lower end of the cylinder of the electrolyte absorption mechanism 5. When the puncturing mechanism 4 moves downward to puncture the aluminum-plastic film of the lithium battery, the convex guide shafts 4.12 at both ends of the puncturing mechanism 4 will be inserted into the concave guide shafts 5.12 at both ends of the electrolyte absorption mechanism, so as to transmit the pressure of the puncturing mechanism 4 to the electrolyte absorption mechanism 5, and the electrolyte absorption mechanism 5 will transmit the pressure to the auxiliary bearing mechanism 7 to avoid crushing the driving cylinder of the electrolyte absorption mechanism 5.

[0059] The heat-sealing process of the soft-pack lithium battery heat-sealing device is as follows:

[0060] A: The aluminum-plastic film containing the battery cell is loaded into the carrier 2.4 on the conveying mechanism 2, and the first pressing block assembly 2.3 presses the aluminum-plastic film in the carrier. The conveying mechanism 2 conveys the soft-pack lithium battery into the vacuum chamber 1, and the sealing push plate 2.1 of the conveying mechanism 2 is hermetically fixed to the rear end of the vacuum chamber 1;

[0061] B: The electrolyte absorption mechanism 5 is driven by a cylinder to move upward to adsorb the aluminum-plastic film. When the puncturing mechanism 4 presses down to puncture, at the same time, the auxiliary bearing mechanism 7 advances forward, and the support seat 7.1 slides to the lower end of the cylinder of the electrolyte absorption mechanism 5;

[0062] C: The piercing mechanism 4 is started to press down by the air cylinder, and is guided and positioned through the convex guide shafts 4.12 at both ends and the concave guide shaft 5.12 on the electrolyte absorption mechanism 5. The needle at the lower end of the piercing mechanism 4 pierces the aluminum-plastic film.

[0063] D: The vacuum chamber 1 starts to pump out the air, exhausting all the air inside the aluminum-plastic film. A number of suction cups on the electrolyte absorption mechanism 5 continuously absorb water, discharging the electrolyte flowing out of the battery core due to the vacuum pumping.

[0064] E: When the pressure sensor detects that the air pressure value inside the vacuum chamber 1 reaches the system set value, it guides the upper and lower heat-sealing mechanisms 6 to move up and down synchronously to heat-seal the aluminum-plastic film of the aluminum battery.

[0065] F: After the heat-sealing is completed, the heat-sealing mechanism 6, the piercing mechanism 4, the auxiliary bearing mechanism 7, the electrolyte absorption mechanism 5, and the pressing mechanism 3 are reset. The vacuum chamber 1 is reset by inflating. The conveying mechanism 2 takes out the heat-sealed lithium battery and repeats step A to perform the heat-sealing of the next lithium battery.

[0066] The specific embodiments described above further elaborate on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A vacuum heat-sealing device for soft-pack lithium batteries, characterized in that: Including: A vacuum chamber (1) for providing a working environment for vacuum heat sealing. The vacuum chamber (1) is provided with a viewing window assembly (1.1) for viewing the internal work. A conveying mechanism (2) for conveying a carrier (2.4) loaded with a soft-pack lithium battery into the vacuum chamber (1) and sealing it with the vacuum chamber (1). A pressing mechanism (3) for further pressing and fixing the soft-pack lithium battery conveyed by the conveying mechanism (2), and fixing the battery cell of the soft-pack lithium battery and the aluminum-plastic film wrapping the battery cell in the carrier (2.4) for subsequent operations. A puncturing mechanism (4) with a puncturing assembly (4.1) provided at the lower end. The puncturing assembly (4.1) is provided with a plurality of puncturing terminals (4.11). The puncturing mechanism (4) presses down to puncture the aluminum-plastic film encapsulating the battery cell through the puncturing terminals (4.11). An electrolyte absorption mechanism (5) with a suction cup assembly (5.1) provided at the upper end corresponding to the puncturing assembly (4.1). The suction cup assembly (5.1) is provided with a plurality of suction cups (5.11). The plurality of suction cups (5.11) are vertically corresponding to the puncturing terminals (4.11). A drainage pipe is connected to the lower ends of the plurality of suction cups (5.11). The electrolyte absorption mechanism (5) moves upward. When the plurality of suction cups (5.11) contact the lower part of the aluminum-plastic film of the soft-pack lithium battery, the electrolyte absorption mechanism (5) stops moving. The plurality of suction cups (5.11) adsorb the aluminum-plastic film and wait for the puncturing mechanism (4) to press down and puncture the aluminum-plastic film. After the aluminum-plastic film is punctured, the vacuum chamber (1) starts to evacuate, sucking away the gas inside the aluminum-plastic film. At the same time, the plurality of suction cups (5.11) suck away the electrolyte that may flow out from the battery cell in the aluminum-plastic film. A heat sealing mechanism (6) including an upper heat sealing mechanism (6-1) and a lower heat sealing mechanism (6-2). The upper heat sealing mechanism (6-1) and the lower heat sealing mechanism (6-2) are vertically corresponding to heat seal the aluminum-plastic film of the soft-pack lithium battery after sucking away air and water. The operations of the pressing mechanism (3), the puncturing mechanism (4), the electrolyte absorption mechanism (5), and the heat sealing mechanism (6) are all completed inside the vacuum chamber (1). It further includes an auxiliary bearing mechanism (7) for bearing the weight of the electrolyte absorption mechanism (5) to prevent damage to the electrolyte absorption mechanism (5) caused by excessive downward pressure of the puncturing mechanism (4). The auxiliary bearing mechanism includes a support seat driven by a cylinder to move back and forth on a slide rail. When the electrolyte absorption mechanism moves upward to adsorb and fix the aluminum-plastic film of the lithium battery, the support seat on the auxiliary bearing mechanism is driven by the cylinder to move forward to the lower end of the cylinder of the electrolyte absorption mechanism. The puncturing terminal (4.11) includes a puncturing needle (4.111) and a movable bushing (4.112). The puncturing needle (4.111) is fixedly arranged at the lower end of the puncturing assembly (4.1). The movable bushing (4.112) wraps the lower end of the puncturing needle (4.111) and can slide up and down. The outer diameter of the movable bushing (4.112) is slightly smaller than the inner diameter of the suction cup (5.11). When the suction cup (5.11) on the electrolyte absorption mechanism (5) contacts the lower end of the aluminum-plastic film of the soft-pack lithium battery, the suction cup (5.11) adsorbs the aluminum-plastic film. The puncturing mechanism (4) drives the puncturing assembly (4.1) to move downward. The movable bushing (4.112) first contacts the aluminum-plastic film adsorbed above the suction cup (5.11). The movable bushing (4.112) is blocked by the aluminum-plastic film. The puncturing assembly (4.1) drives the puncturing needle (4.111) to continue moving downward for a certain distance to puncture the aluminum-plastic film. The movable bushing (4.112) presses the punctured aluminum-plastic film above the suction cup (5.11). The vacuum chamber (1) starts to pump out the air, evacuating the air in the aluminum-plastic film. At the same time, the suction cup (5.11) absorbs the electrolyte flowing out of the battery cell due to the vacuum pumping and discharges it through the drain pipe. The puncturing assembly (4.1) further includes a convex guiding shaft (4.12), and the convex guiding shaft (4.12) is arranged at the left and right ends of the plurality of puncturing terminals; the suction cup assembly (5.1) further includes a concave guiding shaft (5.12) corresponding to the convex guiding shaft (4.12) up and down. The convex end at the lower end of the convex guiding shaft (4.12) is inserted into the groove at the upper end of the concave guiding shaft (5.12) to complete the guiding and positioning between the puncturing mechanism (4) and the electrolyte absorption mechanism (5). The viewing window assembly (1.1) includes a transparent sealing plate (1.11). The transparent sealing plate (1.11) is hermetically connected to the box body of the vacuum chamber (1) through a sealing ring, and then is hermetically fixed to the vacuum chamber (1) by pressing a plurality of viewing window switches (1.12) on the vacuum chamber (1); a detachable handle is arranged on the transparent sealing plate (1.11). The conveying mechanism (2) includes a sealing push plate (2.1), a conveying plate (2.2), and a first pressing block assembly (2.3). The carrier (2.4) is fixed at the front upper end of the conveying plate (2.2) and is used for loading the soft-pack lithium battery to be heat-sealed. The conveying plate (2.2) is vertically fixed to the sealing push plate (2.1). The first pressing block assembly (2.3) is arranged at the rear upper end of the conveying plate (2.2) and is used for pressing the soft-pack lithium battery in the carrier (2.4). The sealing push plate (2.1) pushes the conveying plate (2.2) into the vacuum chamber (1) and is fixed to the vacuum chamber (1). The sealing push plate (2.1) is sealed with the vacuum chamber (1) through a sealing ring.

2. The vacuum heat-sealing device for soft-pack lithium batteries according to claim 1, characterized in that: The vacuum chamber (1) further includes a pressure sensor (1.2), an air extraction port (1.3), and a heater inlet / outlet (1.4). The air extraction port (1.3) extracts the air inside the vacuum chamber to form a vacuum working environment. The heater inlet / outlet (1.4) is used for loading the inlet and outlet of the heater heat source. The pressure sensor (1.2) monitors the pressure data inside the vacuum chamber (1). When the pressure value inside the vacuum chamber (1) reaches the set value, the heat sealing mechanism (6) starts to perform the up and down heat sealing actions to heat seal the aluminum-plastic film.

3. A vacuum heat-sealing device for soft-pack lithium batteries according to claim 1, characterized in that: The upper heat sealing mechanism (6-1) and the lower heat sealing mechanism (6-2) are respectively provided with heat sealing knives (6.1) up and down. The up and down heat sealing knives are heated by a cartridge heater 6.2 to heat seal the aluminum-plastic film. Insulating plates (6.2) are provided on both sides of the up and down heat sealing knives. The up and down heat sealing mechanisms (6) are both provided with temperature sensors (6.4) for monitoring the temperature.

4. A vacuum heat-sealing device for soft-pack lithium batteries according to claim 1, characterized in that: A roller mechanism (8) is fixed near the lower end of the conveying mechanism (2) inside the vacuum chamber (1) to facilitate the smooth and stable conveyance of the soft-pack lithium battery into the vacuum chamber (1) by the conveying mechanism (2).

5. The vacuum heat-sealing device for soft-pack lithium batteries according to claim 4, characterized in that: A plurality of fixing seats (1.5) are provided around the vacuum chamber (1).

Images