A secondary battery packaging structure process and device

Abstract

The present invention discloses a secondary battery packaging structure process and device, which relates to the technical field of secondary battery packaging, and comprises the following steps: S1, electrical testing: performing electrical testing on single cells to measure the internal resistance and voltage values of the single cells, dismantling and scrapping the cells with unqualified values, and performing step S2 on the cells with qualified values; S2, puncturing and exhausting: opening a through hole on the battery top cover, the through hole being connected to the battery cell to discharge the high-pressure gas in the battery cell; S3, liquid injection: electrolyte can be injected into the battery cell through the through hole opened in S2; S4, through hole treatment: after the liquid injection is completed, the opened through hole is cleaned; the present invention performs opening and liquid injection on the battery top cover, and re-seals the battery top cover with a prefabricated film, the process causes little damage to the single cells, concentrates the through hole exhaust, avoids splashing and has high safety, and the materials used for repair are significantly reduced compared with the open-cover liquid injection, thereby greatly reducing the cost of secondary packaging.

Description

Technical Field

[0001] The present invention relates to the technical field of secondary battery packaging, and in particular to a secondary battery packaging structure process and device. Background Art

[0002] After a period of use, new battery packs begin to degrade and may no longer be able to meet the power requirements of current devices. However, the batteries are not completely damaged and, after some repair and adjustment, can be used in devices with lower power requirements. For example, after the capacity of an automotive battery has degraded to below 80%, it can be used for backup power for communication base stations or energy storage.

[0003] At present, when adding electrolyte to second-life batteries, the battery top cover is opened with a cover-opening device to expose the internal battery cell structure. During this process, some batteries with high internal pressure will quickly overflow with gas after opening, which is dangerous. After the injection is completed, the connection between the battery top cover and the battery shell needs to be de-glueed, and finally the battery top cover and the battery shell need to be re-glued. The process is relatively cumbersome, resulting in an increase in the processing cost of second-life batteries. Summary of the Invention

[0004] The object of the present invention is to provide a secondary battery packaging structure process and device to solve the above-mentioned deficiencies in the prior art.

[0005] In order to achieve the above object, the present invention provides the following technical solution: a secondary battery packaging structure process, comprising the following steps:

[0006] S1, electrical testing: Perform electrical testing on the single battery to measure the internal resistance and voltage of the single battery. Single batteries with unqualified values are dismantled and scrapped, while single batteries with qualified values proceed to step S2;

[0007] S2, puncture and exhaust: open a through hole on the battery top cover, which is connected to the battery cell to discharge the high-pressure gas in the battery cell;

[0008] S3, squeeze injection: squeeze the single battery so that the shell of the single battery is concave toward the battery cell, and the electrolyte can be injected into the battery cell through the through hole opened in S2;

[0009] S4, through-hole treatment: After the injection is completed, the opened through-hole is cleaned, then nano-etched, and finally passivated;

[0010] S5, prefabricated film preparation: the metal sheet is punched to form film A, the hot melt adhesive is cut to form film B, and film A and film B are composited to form a prefabricated film;

[0011] S6, sealing: using a prefabricated film to seal the through hole formed in S2;

[0012] S7, shipped in different volumes.

[0013] Preferably, in S6, the prefabricated film is heated so that the prefabricated film can be connected to the battery top cover to achieve sealing of the through hole.

[0014] Preferably, the single battery is a recycled second-life battery or a battery with abnormal injection during production.

[0015] A secondary battery packaging device, comprising:

[0016] A frame, the frame being slidably connected to a lifting plate;

[0017] A driving part, which is used to drive the lifting plate to move in the vertical direction;

[0018] A first opening structure is provided on the lifting plate, and when the lifting plate moves downward, the first opening structure can open a blind hole on the single battery;

[0019] A second opening structure is drilled along the blind hole to form a through hole on the battery top cover, the through hole being connected to the battery cell of the single battery;

[0020] A collecting component, which collects debris generated by drilling when the second opening structure is drilling, and extracts gas from the inside of the single battery after the through hole is formed;

[0021] The liquid injection structure can be used to inject electrolyte into the interior of the single cell through the through hole.

[0022] Preferably, the driving part includes a screw and a first motor, the screw is rotatably connected to the frame, the screw is threadedly connected to the lifting plate, and the first motor is used to drive the screw to rotate.

[0023] Preferably, the first hole opening structure includes a first drill bit and a second motor, a pair of the second motors are fixedly mounted on the lifting plate, and the first drill bit is fixedly mounted on the output shaft of the second motor.

[0024] Preferably, the second hole opening structure includes a transmission shaft, a second drill bit, and a power unit. A pair of the transmission shafts are rotatably connected to the lifting plate, and the second drill bit is fixedly installed at the lower part of the transmission shaft. The power unit is used to simultaneously drive a pair of transmission shafts to rotate. The power unit includes a third motor, a belt, and a pulley. A plurality of the pulleys are respectively fixedly installed on the third motor and the transmission shaft, and the pulleys are connected by belt transmission.

[0025] Preferably, the collecting assembly includes a three-way valve, a first check valve, a second check valve, a second connecting pipe, a second hose and a suction part. The three-way valve is sleeved on the upper part of the drive shaft. An air duct is opened in the drive shaft. The upper part of the air duct is connected to the three-way valve, and the lower part of the air duct is located on the bottom surface of the drive shaft. The first check valve and the second check valve are both installed on the three-way valve, and the second check valve is connected to the second connecting pipe. The suction part and the second connecting pipe are connected by a second hose, and the suction part is used to flush the air in the second connecting pipe.

[0026] Preferably, the suction part includes a cylinder, a filter cartridge, a high-pressure centrifugal fan, a piston plate, a scraper, a center column, a jacket, an elastic member, and an end cover. The cylinder is separated into an air guide chamber and a storage chamber by the filter cartridge. The high-pressure centrifugal fan is connected to the air guide chamber. The piston plate is used to seal the bottom of the filter cartridge. The end cover is threadedly connected to the bottom of the cylinder. The jacket is fixedly mounted on the end cover. The lower end of the center column is inserted into the jacket. The elastic member applies an upward thrust to the center column. The scraper is fixedly mounted on the center column. The scraper fits the inner wall of the filter cartridge. The upper end of the center column is fixedly mounted on the piston plate.

[0027] Preferably, the liquid injection structure includes a material pump, a first connecting pipe, and a first hose. The first connecting pipe is connected to a first check valve, and the material pump and the first connecting pipe are connected via the first hose.

[0028] In the above technical solution, the present invention provides a secondary battery packaging structure process and device, which opens a hole in the battery top cover and injects liquid through the hole. After the injection is completed, the prefabricated film is thermally composited on the top cover, and the battery top cover is re-sealed through the prefabricated film. This process causes little damage to the single battery, concentrates the exhaust through the through hole, avoids splashing, and has high safety. The materials used for repair are significantly reduced compared to the open-cover injection method, which greatly reduces the cost of secondary packaging. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0030] Figure 1 This is a process flow chart of a secondary battery packaging structure process and device of the present invention;

[0031] Figure 2 A schematic diagram of the overall structure of a secondary battery packaging device according to a secondary battery packaging structure process and device of the present invention;

[0032] Figure 3 A schematic diagram of a partial structure of a secondary battery packaging structure process and device according to the present invention;

[0033] Figure 4 This is an appendix of a secondary battery packaging structure process and device of the present invention Figure 3 The schematic diagram of the structure after enlarging A in the middle;

[0034] Figure 5 This is a cross-sectional view of a transmission shaft of a secondary battery packaging structure process and device according to the present invention;

[0035] Figure 6 This is an appendix of a secondary battery packaging structure process and device of the present invention Figure 5 The schematic diagram of the structure after the enlargement of D in the middle;

[0036] Figure 7 This is an appendix of a secondary battery packaging structure process and device of the present invention Figure 5 The schematic diagram of the structure after enlarging at E in the middle;

[0037] Figure 8 A schematic cross-sectional view of a suction portion of a secondary battery packaging structure process and device according to the present invention;

[0038] Figure 9 This is an appendix of a secondary battery packaging structure process and device of the present invention Figure 9 The schematic diagram of the structure after enlarging point B in the middle;

[0039] Figure 10 This is a structural schematic diagram of a suction portion of a secondary battery packaging structure process and device in a suction state according to the present invention;

[0040] Figure 11 This is an appendix of a secondary battery packaging structure process and device of the present invention Figure 10 The schematic diagram of the structure after enlarging at C in the middle;

[0041] Figure 12 A schematic diagram of a secondary battery encapsulated by a secondary battery encapsulation structure process of the present invention.

[0042] Explanation of the accompanying symbols: 1. Track groove; 2. Frame; 3. Lifting plate; 4. Driving unit; 41. Screw rod; 42. First motor; 5. First opening structure; 51. First drill bit; 52. Second motor; 6. Second opening structure; 61. Transmission shaft; 611. Airway; 62. Second drill bit; 63. Three-way valve; 64. First check valve; 65. Second check valve; 7. Power unit; 71. Third motor; 72. Belt; 73. Pulley; 8. A connecting pipe; 9. A second connecting pipe; 10. A first hose; 11. A material pump; 12. A second hose; 13. A suction portion; 131. A cylinder; 132. A filter cartridge; 133. An air guide chamber; 134. A storage chamber; 135. A high-pressure centrifugal fan; 136. A piston plate; 137. A scraper; 138. A center column; 139. A jacket; 1391. An elastic member; 1392. An end cover; 14. A single cell; 15. A cell top cover; 16. A prefabricated membrane. DETAILED DESCRIPTION

[0043] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0044] See also Figure 1-12 , an embodiment of the present invention provides a secondary battery packaging structure process, comprising the following steps:

[0045] S1, electrical testing: Perform electrical testing on the single battery 14 to measure the internal resistance and voltage of the single battery 14. Single batteries 14 with unqualified values are dismantled and scrapped, while single batteries 14 with qualified values proceed to step S2;

[0046] S2, puncture and exhaust: open a through hole on the battery top cover 15, the through hole is connected to the battery cell to discharge the high-pressure gas in the battery cell;

[0047] S3, squeezing and injecting: squeezing the single battery 14 so that the shell of the single battery 14 is concave toward the battery cell, and injecting the electrolyte into the battery cell through the through hole opened in S2;

[0048] S4, through-hole treatment: After the injection is completed, the opened through-hole is cleaned, then nano-etched, and finally passivated;

[0049] S5, preparation of prefabricated film 16: the metal sheet is punched to form film A, the hot melt adhesive is cut to form film B, and film A and film B are composited to form prefabricated film 16;

[0050] S6, sealing: using the prefabricated film 16 to seal the through hole formed in S2;

[0051] S7, shipped in different volumes.

[0052] In S6 , the prefabricated film 16 is heated so that the prefabricated film 16 can be connected to the battery top cover 15 to achieve sealing of the through hole.

[0053] The single battery 14 is a recycled second-life battery or a battery with abnormal injection during production.

[0054] In the embodiment of the present invention, when S1 performs electrical testing, ternary lithium batteries and lithium iron phosphate batteries have different testing standards. Ternary lithium batteries are unqualified if the voltage is lower than 2.5, and lithium iron phosphate batteries are unqualified if the voltage is lower than 2.0. The internal resistance of ternary lithium batteries and lithium iron phosphate batteries is different according to the size of the battery cells. They cannot be tested with fixed values. Let the initial internal resistance be X. If the tested internal resistance is not greater than 1.4X, it is qualified. If any one of the voltage and internal resistance tests fails, the battery needs to be scrapped. Before filling the liquid, the battery cell 14 can be clamped with a clamp. Under the action of the clamping force, the shell of the battery cell 14 will move toward the battery cell. The concave shape helps to discharge the gas in the battery cell 14, and the injection is smoother, which helps to improve the repair quality of the cascade battery. A hole is opened in the battery top cover and the liquid is injected through the through hole. After the injection is completed, the prefabricated film 116 is thermally composited on the battery top cover 15, and the battery top cover 15 is re-sealed through the prefabricated film 16. When sealing, the shell of the battery cell 14 remains in a concave state, which reduces the gas in the battery cell 14. This process causes little damage to the single cell 14, concentrates the exhaust through the through hole, avoids splashing, and has high safety. The materials used for repair are significantly reduced compared to the open-cap injection, which greatly reduces the secondary packaging cost.

[0055] In another embodiment of the present invention, as new energy sources develop more and more rapidly, the requirements for battery energy density are increased and higher requirements are put forward for safety. At present, batteries are equipped with safety valve designs, but they can only be depressurized and exhausted when a certain pressure is reached during thermal runaway or related tests. This takes a long time and brings a high level of danger. In addition, the opening of the safety valve is greatly affected by its own factors. For example, the opening pressure of the safety valve may be inconsistent during assembly welding. The cascade battery produced by the present invention is sealed with a prefabricated membrane 16. When the temperature of the battery cell rises abnormally, the prefabricated membrane 16 will detach from the battery top cover and release the internal pressure of the battery cell in advance, thereby reducing the risk of thermal runaway and further improving the safety and life of the cascade battery.

[0056] When the present invention is drilling, the gas inside the battery cell will inevitably splash, and the debris generated during the hole drilling will fall into the interior of the single cell 14, affecting the battery quality. Therefore, we have developed a secondary battery packaging device based on the secondary battery packaging structure process to solve the problem of gas splashing when drilling and debris entering the interior of the single cell.

[0057] A secondary battery packaging device, comprising:

[0058] Frame 2, frame 2 is slidably connected to a lifting plate 3;

[0059] A driving unit 4, which is used to drive the lifting plate 3 to move in the vertical direction;

[0060] A first opening structure 5 is provided on the lifting plate 3. When the lifting plate 3 moves downward, the first opening structure 5 can open a blind hole on the single battery 14.

[0061] The second opening structure 6 is drilled along the blind hole to form a through hole on the battery top cover 15, and the through hole is connected to the battery cell 14;

[0062] A collecting component, which collects debris generated by drilling when the second opening structure 6 is drilling, and extracts gas from the internal of the single battery 14 after the through hole is formed;

[0063] The liquid injection structure can be used to inject electrolyte into the interior of the single battery 14 through the through hole.

[0064] The lifting plate 3 is driven by the driving unit 4 to move in the vertical direction, and the first opening structure 5 and the second opening structure 6 are both located on the lifting plate 3. In this way, by lowering the lifting plate 3, the first opening structure 5 and the second opening structure 6 can be brought into contact with the battery top cover 15 to achieve the hole rotation on the battery top cover 15;

[0065] See attached Figure 2 , including a track groove 1, which limits the single battery 14 so that the single battery 14 passes through the first opening structure 5 and the second opening structure 6 in sequence when sliding along the track groove 1.

[0066] The movement of the single cell 14 is restricted by the track groove 1, and the single cell 14 can move along the track groove 1. When the single cell 14 is below the first opening structure 5, a blind hole can be opened on the battery top cover 15 through the first opening structure 5. When the single cell 14 moves below the second opening structure 6, the second opening structure 6 can continue to open the hole on the basis of the blind hole, so that a through hole is formed on the battery top cover 15, so that liquid can be injected through the through hole.

[0067] The collecting component collects the debris generated by drilling during the second opening structure 6, thereby preventing a large amount of debris from falling into the interior of the single cell 14 during penetration. After penetration, the gas inside the single cell 14 will also be sucked out by the collecting component, thereby avoiding splashing when the single cell 14 is penetrated through the hole, thereby improving safety.

[0068] The electrolyte injection structure can be injected into the single battery 14 to supplement the electrolyte lacking in the single battery 14 .

[0069] The through-hole drilling and liquid injection are all carried out at the same station, without the need for secondary movement, thus reducing the exposure of the internal cells of the single battery 14.

[0070] In the embodiments of the present invention, please refer to Figure 3 The driving part 4 includes a screw rod 41 and a first motor 42. The screw rod 41 is rotatably connected to the frame 2. The screw rod 41 is threadedly connected to the lifting plate 3. The first motor 42 is used to drive the screw rod 41 to rotate.

[0071] The rotation of the first motor 42 can drive the screw rod 41 to rotate. The screw rod 41 and the lifting plate 3 are threadedly connected. Therefore, according to the different rotation directions of the screw rod 41, the lifting plate 3 will change its height in the vertical direction to achieve synchronous movement of the first opening structure 5 and the second opening structure 6, thereby realizing the opening of the battery top cover 15.

[0072] In the embodiments of the present invention, please refer to Figure 3 The first hole-opening structure 5 includes a first drill bit 51 and a second motor 52. The second motors 52 are fixedly mounted on the lifting plate 3, and the first drill bit 51 is fixedly mounted on the output shaft of the second motor 52. The output shaft of the second motor 52 rotates to drive the first drill bit 51 to rotate. When the first drill bit 51 contacts the battery cover 15, a blind hole is formed. At this time, the battery cell remains sealed.

[0073] The second opening structure 6 includes a transmission shaft 61, a second drill bit 62, and a power unit 7. A pair of the transmission shafts 61 are rotatably connected to the lifting plate 3, and the second drill bit 62 is fixedly installed at the lower part of the transmission shaft 61. The power unit 7 is used to simultaneously drive a pair of transmission shafts 61 to rotate. The power unit 7 includes a third motor 71, a belt 72, and a pulley 73. Multiple pulleys 73 are respectively fixedly installed on the third motor 71 and the transmission shaft 61, and the pulleys 73 are connected by belts 72.

[0074] Through the linkage action of the power unit 7, a pair of transmission shafts 61 can be rotated synchronously, so that the second drill bit 62 can synchronously drill holes in the battery top cover 15. Since the lowest point of the second drill bit 62 is lower than the first drill bit 51, when the battery cell 14 moves to below the second opening structure 6, the lifting plate 3 is lowered, and the second drill bit 62 can continue to drill along the blind hole to form a through hole for liquid injection on the battery top cover 15. The diameter of the second drill bit 62 is smaller than that of the first drill bit 51. In order to reduce damage to the battery top cover 15, the diameter of the second drill bit 62 is much smaller than that of the first drill bit 51.

[0075] In the embodiments of the present invention, please refer to Figure 2-7 The collecting component includes a three-way valve 63, a first check valve 64, a second check valve 65, a second connecting pipe 9, a second hose 12 and a suction part 13. The three-way valve 63 is sleeved on the upper part of the drive shaft 61. An air channel 611 is opened in the drive shaft 61. The upper part of the air channel 611 is connected to the three-way valve 63, and the lower part of the air channel 611 is located on the bottom surface of the drive shaft 61. The first check valve 64 and the second check valve 65 are both installed on the three-way valve 63. The second check valve 65 is connected to the second connecting pipe 9. The suction part 13 and the second connecting pipe 9 are connected by the second hose 12. The suction part 13 is used to flush the air in the second connecting pipe 9.

[0076] When the second drill bit 62 is drilling, the transmission shaft 61 is inserted into the blind hole to seal the blind hole. At this time, the debris generated by the second drill bit 62 will be discharged into the blind hole, and the suction part 13 will generate negative pressure in the second connecting pipe 9. The lower part of the air channel 611 is connected to the blind hole. Therefore, the debris generated by the second drill bit 62 will be sucked into the air channel 611 along with the air flow, and enter the second check valve 65 along the air channel 611. After passing through the second check valve 65, it enters the second connecting pipe 9. In this way, the debris generated by drilling will be continuously sucked into the suction part 13. When the through hole is penetrated, under the action of negative pressure, the high-pressure gas in the single cell 14 is sucked into the air channel 611 and finally enters the suction part 13. In this way, the debris falling into the single cell 14 can be greatly reduced to protect the internal battery cell. Moreover, when the through hole is penetrated, the gas escaped will also be sucked by the suction part 13, which greatly increases safety.

[0077] In the embodiments of the present invention, please refer to Figure 8-11 The suction part 13 includes a cylinder 131, a filter cylinder 132, a high-pressure centrifugal fan 135, a piston plate 136, a scraper 137, a center column 138, a jacket 139, an elastic member 1391, and an end cover 1392. The cylinder 131 is separated into an air guide chamber 133 and a storage chamber 134 by the filter cylinder 132. The high-pressure centrifugal fan 135 is connected to the air guide chamber 133. The piston plate 136 is used to block the bottom of the filter cylinder 132. The end cover 1392 is threadedly connected to the bottom of the cylinder 131, the outer sleeve 139 is fixedly mounted on the end cover 1392, the lower end of the center column 138 is inserted into the outer sleeve 139, the elastic member 1391 applies an upward thrust to the center column 138, the scraper 137 is fixedly mounted on the center column 138, the scraper 137 is in contact with the inner wall of the filter cylinder 132, and the upper end of the center column 138 is fixedly mounted on the piston plate 136.

[0078] The suction unit 13 is not activated as shown in the attached figure. Figure 8-9As shown, at this time, under the elastic force of the elastic member 1391, the center column 138 is at the highest point, the piston plate 136 and the upper part of the filter cartridge 132 are fitted together, and after the suction part 13, the high-pressure centrifugal fan 135 will suck the gas in the air guide cavity 133, and the interior of the filter cartridge 132 is connected to the air guide cavity 133, so the pressure in the filter cartridge 132 is small, so the pressure below the piston plate 136 is small, and the pressure above the piston plate 136 is large, so the piston plate 136 will automatically move downward, and the piston plate 136 will synchronously drive the center column 138 to move, and the center column 138 will move downward against the elastic force of the elastic member 1391, and the scraper 137 will synchronize the center column 138 to move downward. The scraper 137 will scrape the inner wall of the filter cartridge 132, To remove the attachments on the inner wall of the filter cartridge 132, the attachments fall into the storage chamber 134. With long-term use, the filter cartridge 132 is blocked. At this time, the high-pressure centrifugal fan 135 is difficult to suck the gas in the filter cartridge 132, and the piston plate 136 loses the squeezing of the airflow. The elastic member 1391 will rebound, and the center column 138 moves upward. During the upward movement, the inner wall of the filter cartridge 132 is scraped again to separate the attachments. The air flux of the filter cartridge 132 increases, and when the air pressure in the filter cartridge 132 drops, the piston plate 136 drops again. In this way, the inner wall of the filter cartridge 132 can be passively cleaned, which greatly extends the maintenance time. The end cover 1392 is detachable to facilitate the discharge of the stored material in the storage chamber 134.

[0079] The liquid injection structure includes a material pump 11 , a first connecting pipe 8 , and a first hose 10 . The first connecting pipe 8 is connected to a first check valve 64 . The material pump 11 and the first connecting pipe 8 are connected via the first hose 10 .

[0080] The electrolyte is sucked from the outside by the material pump 11, and the electrolyte is transported to the first connecting pipe 8 through the first hose 10, and then transported to the first check valve 64 through the first connecting pipe 8, and then enters the three-way valve 63 after passing through the first check valve 64, and enters the air channel 611 through the three-way valve 63, and finally transported to the blind hole through the air channel 611. During the injection process, the suction part 13 is in a closed state, and under the action of suction, the interior of the single cell 14 is in a slightly negative pressure state at this time, and the electrolyte can be easily injected into the single cell 14. Moreover, the penetration of the through hole, negative pressure suction and injection are all in the same work station. During the penetration of the through hole, negative pressure suction and injection, the transmission shaft 61 is in contact with the through hole, so that it has better isolation performance.

[0081] Moreover, according to actual needs, the position of the through hole can correspond to the position of the positive and negative poles of the single battery 14, so that the positive and negative poles can be flushed during the electrolyte injection process, so that the attachments on the surface of the positive and negative poles can be cleaned.

[0082] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A secondary battery packaging structure process, characterized in that: The following steps are involved: S1, electrical testing: perform electrical testing on the single battery (14), measure the internal resistance and voltage value of the single battery (14), dismantle and discard the single battery (14) if the value is unqualified, and proceed to step S2 if the value is qualified; S2, puncture and exhaust: a through hole is opened on the battery top cover (15), and the through hole is connected to the battery cell to discharge the high-pressure gas in the battery cell; S3, squeezing and injecting: squeezing the single battery (14) so that the shell of the single battery (14) is recessed toward the battery cell, and injecting the electrolyte into the battery cell through the through hole opened in S2; S4, through-hole treatment: After the injection is completed, the opened through-hole is cleaned, then nano-etched, and finally passivated; S5, preparation of prefabricated film 16: the metal sheet is punched to form film A, the hot melt adhesive is cut to form film B, and the film A and film B are composited to form a prefabricated film (16); S6, sealing: using a prefabricated film (16) to seal the through hole formed in S2; S7, shipment in different volumes; A secondary battery packaging device based on a secondary battery packaging structure process includes: A frame (2), the frame (2) being slidably connected to a lifting plate (3); A driving portion (4) for driving the lifting plate (3) to move in a vertical direction; A first opening structure (5) is provided on the lifting plate (3), and when the lifting plate (3) moves downward, the first opening structure (5) can open a blind hole on the single battery (14); A second opening structure (6) is drilled along the blind hole to form a through hole on the battery top cover (15), the through hole being connected to the battery cell of the single battery (14); A collecting component, which collects debris generated by drilling in the second opening structure (6) and extracts gas from the interior of the single cell (14) after the through hole is formed; A liquid injection structure, through which electrolyte can be injected into the interior of the single cell (14) using the through hole; The invention comprises a three-way valve (63), a first check valve (64), a second check valve (65), a second connecting pipe (9), a second hose (12) and a suction part (13), wherein the three-way valve (63) is sleeved on the upper part of the transmission shaft (61), an air passage (611) is provided in the transmission shaft (61), the upper part of the air passage (611) is connected to the three-way valve (63), and the lower part of the air passage (611) is located on the bottom surface of the transmission shaft (61), the first check valve (64) and the second check valve (65) are both installed on the three-way valve (63), the second check valve (65) is connected to the second connecting pipe (9), the suction part (13) and the second connecting pipe (9) are connected via the second hose (12), and the suction part (13) is used for flushing air in the second connecting pipe (9); The suction part (13) includes a cylinder (131), a filter cylinder (132), a high-pressure centrifugal fan (135), a piston plate (136), a scraper (137), a center column (138), a jacket (139), an elastic member (1391), and an end cover (1392). The cylinder (131) is separated into an air guide cavity (133) and a storage cavity (134) by the filter cylinder (132). The high-pressure centrifugal fan (135) is connected to the air guide cavity (133). The piston plate (136) is used to block the bottom of the filter cylinder (132). The end cover (1392) is threadedly connected to the bottom of the cylinder (131), the outer sleeve (139) is fixedly mounted on the end cover (1392), the lower end of the center column (138) is inserted into the outer sleeve (139), the elastic member (1391) applies an upward thrust to the center column (138), the scraper (137) is fixedly mounted on the center column (138), the scraper (137) is in contact with the inner wall of the filter cylinder (132), and the upper end of the center column (138) is fixedly mounted to the piston plate (136).

2. A secondary battery packaging structure process according to claim 1, characterized in that: In S6, the prefabricated film (16) is heated so that the prefabricated film (16) can be connected to the battery top cover (15) to achieve sealing of the through hole.

3. The secondary battery packaging structure process according to claim 1, characterized in that: The single battery (14) is a recycled secondary battery or a battery with abnormal injection during production.

4. The secondary battery packaging structure process according to claim 1, characterized in that: The driving part (4) comprises a screw rod (41) and a first motor (42), wherein the screw rod (41) is rotatably connected to the frame (2), the screw rod (41) is threadedly connected to the lifting plate (3), and the first motor (42) is used to drive the screw rod (41) to rotate.

5. The secondary battery packaging structure process according to claim 1, characterized in that: The first hole-opening structure (5) comprises a first drill bit (51) and a second motor (52), a pair of the second motors (52) being fixedly mounted on the lifting plate (3), and the first drill bit (51) being fixedly mounted on the output shaft of the second motor (52).

6. The secondary battery packaging structure process according to claim 1, characterized in that: The second opening structure (6) comprises a transmission shaft (61), a second drill bit (62), and a power unit (7). A pair of the transmission shafts (61) are rotatably connected to the lifting plate (3). The second drill bit (62) is fixedly mounted on the lower portion of the transmission shaft (61). The power unit (7) is used to simultaneously drive the pair of transmission shafts (61) to rotate. The power unit (7) comprises a third motor (71), a belt (72), and a pulley (73). A plurality of pulleys (73) are respectively fixedly mounted on the third motor (71) and the transmission shaft (61). The pulleys (73) are connected to each other through a belt (72).

7. The secondary battery packaging structure process according to claim 1, characterized in that: The liquid injection structure comprises a material pump (11), a first connecting pipe (8), and a first hose (10); the first connecting pipe (8) is connected to a first check valve (64); and the material pump (11) and the first connecting pipe (8) are connected via the first hose (10).

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