Secondary battery packaging structure process and device

Abstract

The invention discloses a secondary battery packaging structure process and device, and relates to the technical field of secondary battery packaging, and the secondary battery packaging structure process comprises the following steps: S1, electrical testing: carrying out electrical testing on single batteries, measuring the internal resistance and voltage values of the single batteries, carrying out disassembly and scrapping treatment on unqualified single batteries, and carrying out S2 on qualified single batteries; s2, puncturing and exhausting: forming a through hole in the top cover of the battery, and enabling the through hole to be communicated with the battery cell so as to exhaust high-pressure gas in the battery cell; s3, liquid injection: injecting an electrolyte into the battery cell through the through hole formed in S2; s4, through hole treatment, wherein after liquid injection is completed, the formed through hole is cleaned; according to the invention, the hole is formed in the battery top cover, the liquid is injected, and the battery top cover is sealed again through the prefabricated film, so that the process has the advantages of small damage to the single battery, concentrated exhaust of the through hole, splashing avoidance and high safety, the materials used for repairing are obviously reduced compared with uncovering type liquid injection, and the secondary packaging cost is greatly reduced.

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 certain period of use, new battery packs begin to decay and are insufficient to meet the power requirements of current equipment applications, but the batteries are not completely damaged and can be used on equipment with a lower power requirement after a certain amount of repair and adjustment. For example, after the capacity of a car battery decays to less than 80%, it can be used for communication base station backup power, energy storage and other scenarios.

[0003] At present, when electrolyte is added to second-life batteries, the battery top cover is opened using a cover-opening device to expose the internal battery cell structure. During this process, some batteries with high internal pressure will experience rapid gas overflow after being opened, which is dangerous. After the injection is completed, the connection between the battery top cover and the battery shell needs to be de-glued, 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 deficiencies in the above-mentioned 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 test: perform electrical test on the single battery, measure the internal resistance and voltage value of the single battery, dismantle and scrap the single battery with unqualified values, and proceed to step S2 for the single battery with qualified values;

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

[0008] S3, squeezing and injecting: squeezing 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 an A film, the hot melt adhesive is cut to form a B film, and the A film and the B film 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 cell 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 with a lifting plate;

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

[0018] A first opening structure, which is arranged 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, and the through hole is 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 inside 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 rod and a first motor, the screw rod is rotatably connected to the frame, the screw rod is threadedly connected to the lifting plate, and the first motor is used to drive the screw rod 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 component 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 transmission shaft, an air passage is opened in the transmission shaft, the upper part of the air passage is connected to the three-way valve, the lower part of the air passage is located on the bottom surface of the transmission shaft, the first check valve and the second check valve are both installed on the three-way valve, 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 is in contact with 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 scheme, 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, which greatly reduces the secondary packaging cost. 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 drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

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

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

[0033] Figure 4 The invention relates to a secondary battery packaging structure process and device. Figure 3 The schematic diagram of the structure after the enlargement of A in the middle;

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

[0035] Figure 6 The invention relates to a secondary battery packaging structure process and device. Figure 5 The schematic diagram of the structure after the enlargement of D in the middle;

[0036] Figure 7 The invention relates to a secondary battery packaging structure process and device. 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 of the present invention;

[0038] Fig. 9 The invention relates to a secondary battery packaging structure process and device. Fig. 9 The schematic diagram of the structure after the enlargement of B in the middle;

[0039] Fig.10 It is a structural schematic diagram of a suction part of a secondary battery packaging structure process and device in a suction state according to the present invention;

[0040] Fig.11 The invention relates to a secondary battery packaging structure process and device. Fig.10 The schematic diagram of the structure after enlarging at C in the middle;

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

[0042] Explanation of the reference numerals: 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. first 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. third A connecting pipe; 9, a second connecting pipe; 10, a first hose; 11, a material pump; 12, a second hose; 13, a suction part; 131, a cylinder; 132, a filter cartridge; 133, an air guide cavity; 134, a storage cavity; 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 battery 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 , a secondary battery packaging structure process provided by an embodiment of the present invention comprises the following steps:

[0045] 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 scrap the single battery 14 if the value is unqualified, and proceed to step S2 if the value is qualified;

[0046] 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;

[0047] 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;

[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 the film A and the film B are compounded 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-hand 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. The voltage of ternary lithium batteries is lower than 2.5, which is unqualified. The voltage of lithium iron phosphate batteries is lower than 2.0, which is unqualified. 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. The tested internal resistance is not greater than 1.4X, which is qualified. If any one of the voltage and internal resistance tests is unqualified, the battery needs to be scrapped. Before filling the liquid, the battery cell 14 can be clamped by 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 second-life 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 electromagnetic cell 14 remains concave, which reduces the gas in the electromagnetic cell 14. This process has little damage to the single cell 14, the exhaust of the through hole is concentrated, and the splashing safety is avoided. The materials used for repair are significantly reduced compared with the open-cap injection, which greatly reduces the secondary packaging cost.

[0055] In another embodiment of the present invention, with the rapid development of new energy, the requirements for battery energy density are increased and higher requirements are put forward for safety. At present, batteries are equipped with safety valve design, but in case of thermal runaway or related tests, pressure relief and exhaust can only be performed when a certain pressure is reached. In this way, the time period is relatively long and the danger level is relatively high. In addition, the opening of the safety valve is greatly affected by its own factors. For example, the consistency of the opening pressure of the safety valve will be poor 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 be separated from the battery top cover and the internal pressure of the battery cell will be released in advance without the safety valve opening, 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 a hole, the gas inside the battery cell will inevitably splash, and the debris generated when turning the hole will fall into the inside 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 a hole and debris entering the inside of the single cell.

[0057] A secondary battery packaging device, comprising:

[0058] A frame 2, the frame 2 is slidably connected with a lifting plate 3;

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

[0060] A first opening structure 5, which is disposed 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;

[0061] A 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 of the single battery 14;

[0062] A collecting component, which collects debris generated by drilling when the second opening structure 6 is drilling, and sucks gas inside 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. Thus, by descending 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, so as to realize the hole rotation on the battery top cover 15;

[0065] See attached Figure 2 , including a track groove 1, the track groove 1 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] By limiting the movement of the single cell 14 through the track groove 1, 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 be used to open a 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, thus 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, thus avoiding splashing when the through-hole of the single cell 14 is penetrated, thereby improving safety.

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

[0069] The through-hole penetration and liquid injection are all performed at the same station, without the need for secondary movement, thereby 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 achieving 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 motor 52 is fixedly mounted on the lifting plate 3. 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 top cover 15, a blind hole can be formed. At this time, the battery cell is still in a sealed state.

[0073] The second hole 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. 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. A plurality of the pulleys 73 are respectively fixedly installed on the third motor 71 and the transmission shaft 61, and the pulleys 73 are connected through belts 72 for transmission.

[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 transmission shaft 61. An air channel 611 is opened in the transmission 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 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 through 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 airway 611 is connected to the blind hole. Therefore, the debris generated by the second drill bit 62 will be sucked into the airway 611 along the airway 611, and then enter the second check valve 65, and then enter the second connecting pipe 9 after passing through the second check valve 65. 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 airway 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, and when the through hole is penetrated, the gas escape generated will also be sucked by the suction part 13, which greatly increases the 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 central 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 bar 137 is fixedly mounted on the center column 138, the scraper bar 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.

[0078] The suction unit 13 is not activated as shown in the attached 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, 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 resist the elastic force of the elastic member 1391 and move downward, and the scraper bar 137 will synchronize the center column 138 to move downward. The scraper bar 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, it is difficult for the high-pressure centrifugal fan 135 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 detach the attachments, and the air flux of the filter cartridge 132 increases. When the air pressure in the filter cartridge 132 drops, the piston plate 136 drops again. In this way, passive cleaning of the inner wall of the filter cartridge 132 can be achieved, 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 pipeline 8 , and a first hose 10 . The first connecting pipeline 8 is connected to a first check valve 64 . The material pump 11 and the first connecting pipeline 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 airway 611 through the three-way valve 63, and finally transported to the blind hole through the airway 611. During the injection process, the suction part 13 is in a closed state, and under the action of suction, the inside 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, and 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 fitted with the through hole, so that it has better isolation performance.

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

[0082] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A secondary battery packaging structure process, characterized in that: The following steps are involved: S1, electrical testing: conducting electrical testing on the single battery (14), measuring the internal resistance and voltage value of the single battery (14), dismantling and scrapping the single battery (14) with unqualified values, and proceeding to step S2 for the single battery (14) with qualified values; S2, puncturing holes for exhaust: a through hole is formed on the battery top cover (15), the through hole being connected to the battery cell to discharge the high-pressure gas in the battery cell; S3, squeezing and injecting liquid: squeezing the single battery (14) so ​​that the shell of the single battery (14) is recessed toward the battery cell, and injecting 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 the film B are compounded to form a prefabricated film (16); S6, sealing: using a prefabricated film (16) to seal the through hole formed in S2; S7, shipped in different volumes.

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

4. A secondary battery packaging device, which is implemented based on the secondary battery packaging structure process according to any one of claims 1 to 3, characterized in that: include: A frame (2), the frame (2) being slidably connected with a lifting plate (3); A driving part (4), used for driving the lifting plate (3) to move in a vertical direction; A first opening structure (5) is arranged 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), wherein the through hole is connected to the battery cell of the single battery (14); A collecting component, which collects debris generated by drilling when the second opening structure (6) is drilling, and extracts gas inside the single battery (14) after the through hole is formed; The liquid injection structure can be used to inject electrolyte into the interior of the single cell (14) through the through hole.

5. A secondary battery packaging device according to claim 1, characterized in that: The driving part (4) comprises 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 threadably connected to the lifting plate (3); and the first motor (42) is used to drive the screw rod (41) to rotate.

6. A secondary battery packaging device 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) 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).

7. A secondary battery packaging device according to claim 1, characterized in that: The second hole 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 part 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); and the pulleys (73) are connected to each other by a belt (72).

8. A secondary battery packaging device according to claim 1, characterized in that: The collecting component 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); 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); 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); the suction part (13) is used for flushing the air in the second connecting pipe (9).

9. A secondary battery packaging device according to claim 8, characterized in that: The suction part (13) comprises a cylinder (131), a filter cylinder (132), a high-pressure centrifugal fan (135), a piston plate (136), a scraper (137), a central column (138), a jacket (139), an elastic member (1391), and an end cover (1392); an air guide cavity (133) and a storage cavity (134) are separated in the cylinder (131) by the filter cylinder (132); the high-pressure centrifugal fan (135) is connected to the air guide cavity (133); and 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).

10. A secondary battery packaging device according to claim 9, 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).

Images