A method of nailing suitable for long blade batteries

Abstract

The application provides a nailing method suitable for long-blade batteries, which comprises the following steps: S1, point matching of glue nails and liquid injection holes is completed by a nailing device; S2, first-stage pre-nailing starts, the nailing device drives the glue nails into the liquid injection holes, the nailing depth is H1, the negative pressure is M1, and the pressure maintaining time is S1; S3, after the pressure is broken, second-stage pre-nailing starts, the nailing device drives the glue nails into the liquid injection holes, the nailing depth is H2, the negative pressure is M2, and the pressure maintaining time is S2; S4, after the pressure is broken, third-stage pre-nailing starts, the nailing device drives the glue nails into the liquid injection holes, the nailing depth is H3, the negative pressure is M3, and the pressure maintaining time is S3; S5, after the three times of pre-nailing, the pressure is broken, and the nailing device drives all the glue nails into the liquid injection holes; H1+H2+H3 is 0.5L-0.8L, L is the length of the glue nails, the pressure maintaining pressure M1 is lower than M2 which is lower than M3, and the pressure maintaining time S1>S2>S3. After the three times of pre-nailing and the step-by-step negative pressure shaping, the battery thickness and the liquid loss are controlled.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lithium ion batteries, in particular to a punching method suitable for long blade batteries. BACKGROUND

[0002] Punching after secondary liquid injection is a key process in the manufacturing process of lithium ion batteries, which directly affects the yield of battery sealing welding. At present, the industry mainly adopts negative pressure punching method. For square batteries, the sealing glue nail is generally punched directly into the liquid injection hole through negative pressure. For example, a comparative document with publication number CN105932219A discloses an aluminum shell battery helium injection and punching equipment and method. The equipment includes a base, a vacuum sealing cavity, a horizontal guide rod, a battery jig, a jig cylinder, a helium injection mechanism, a punching mechanism, and a sealing cavity vacuum pumping device. The method is battery loading, placing sealing glue nail, closing the vacuum sealing cavity, vacuum pumping and helium injection in the battery, pressing the sealing glue nail, and taking out the battery.

[0003] For blade batteries, most of them are shaped by negative pressure before punching. This method is mainly used because the current blade battery shell is relatively thin and adopts a standing method for positive pressure liquid injection, which causes the blade battery shell to swell after secondary liquid injection. Therefore, the direct punching method cannot be used, and negative pressure shaping is required. However, for long blade batteries (length exceeding 500mm), the effect of shaping the shell after liquid injection by negative pressure is poor. Large negative pressure easily extracts electrolyte, and small negative pressure shaping effect is not obvious, resulting in battery thickness exceeding the standard. There is no punching method suitable for long blade batteries in the current existing technology. SUMMARY

[0004] The technical problem to be solved by the present application is how to avoid the extraction of electrolyte while ensuring the shaping effect of the battery.

[0005] The present application solves the above technical problems by the following technical means:

[0006] A punching method suitable for long blade batteries, comprising the following steps:

[0007] S1, the glue nail (2) is attracted to the liquid injection hole (11) by the punching device (3) to complete the alignment;

[0008] S2, the first stage pre-punching starts, the glue nail (2) is punched into the liquid injection hole (11) by the punching device (3), the punching depth H1, the negative pressure M1, and the pressure maintaining time S1;

[0009] S3, after the pressure is broken, the second stage pre-punching starts, the glue nail (2) is punched into the liquid injection hole (11) by the punching device (3), the punching depth H2, the negative pressure M2, and the pressure maintaining time S2;

[0010] After S4 pressure is broken, the third stage of pre-nailing begins. The nailing device (3) drives the glue nail (2) into the injection hole (11), the nailing depth is H3, the negative pressure is M3, and the pressure holding time is S3.

[0011] After the three pre-nailing steps of S5 are completed and the pressure is broken, the nailing device (3) will drive all the glue nails (2) into the injection hole (11);

[0012] H1+H2+H3 is 0.5L-0.8L, where L is the length of the rubber nail (2), the holding pressure M1 is lower than M2 and lower than M3, and the holding time is S1>S2>S3.

[0013] Beneficial effects: By employing three stages of pre-nailing and stepped negative pressure holding, the following problems are avoided: excessive negative pressure leading to electrolyte loss and insufficient negative pressure resulting in poor battery shaping and prolonged processing time. The first stage involves shallower nails, combined with low negative pressure and a longer holding time, preventing rapid extraction of electrolyte from the bottom of the battery. During the negative pressure process, the battery is shaped, and the electrolyte fills the entire cell body due to the negative pressure, providing a secondary wetting effect. After pressure is broken, some free electrolyte flows to the bottom of the battery due to gravity. At this point, the second stage of pre-nailing and a second cycle of negative pressure shaping are performed, ensuring the electrolyte remains within the battery and is not extracted. After pressure is broken, some free electrolyte flows to the bottom of the battery due to gravity. At this point, the third stage of pre-nailing, with deeper nails, combined with high negative pressure and a shorter holding time, ensures the electrolyte is evenly distributed within the battery and is not extracted. After three stages of pre-nailing and stepped negative pressure shaping, battery thickness and electrolyte loss are effectively controlled.

[0014] Furthermore, in S2, after the holding time S1 is reached, the glue nail (2) will move up by d1 due to the negative pressure. The deformation component (313) of the nailing device (3) will move up by d1 accordingly. d1 is identified and recorded by the displacement sensor (312). Similarly, d2 is obtained in S3. H1, H2, and H3 must satisfy the following formulas: H1 = 1 / 3L; H2 = d1 + ε1H1; H3 = d2 + ε2H2. Wherein ε1 is the primary pre-nailing depth compensation coefficient, ε1 = the cross-sectional area of ​​the glue nail (2) at depth H1 and the injection hole (11) / the area of ​​the injection hole (11), and the value of ε1 is 0-1. ε2 is the secondary pre-nailing depth compensation coefficient, ε2 = the cross-sectional area of ​​the glue nail (2) at depth H2 and the injection hole (11) / the area of ​​the injection hole (11), and the value of ε2 is 0-1.

[0015] Beneficial effects: The nailing depth of the three pre-nailing operations satisfies the above formula. Based on process verification, this can further ensure that the electrolyte is evenly distributed inside the battery and is not extracted.

[0016] Furthermore, the value range of M1 is -10 kPa to -30 kPa, the value range of M2 is -20 kPa to -50 kPa, and the value range of M3 is -30 kPa to -70 kPa.

[0017] Furthermore, S1 ranges from 4 to 6 seconds, S2 ranges from 2 to 4 seconds, and S3 ranges from 1 to 2 seconds.

[0018] Furthermore, in S1, the negative pressure of the suction pin is between -40 kPa and -50 kPa.

[0019] Furthermore, in S2, before the first stage of nailing begins, the injection hole (11) is sealed by the pressure nozzle (34) of the nailing device (3) abutting against the top wall of the long blade battery (1).

[0020] Beneficial effects: After sealing with a pressure nozzle, positive pressure nailing and negative pressure shaping can be achieved.

[0021] Furthermore, the nailing device (3) includes a nailing mechanism (31), a positive pressure fixture (32), a negative pressure fixture (33), and a pressure nozzle (34). The top of the nailing mechanism (31) is connected to and fixed with the positive pressure fixture (32), which nails by blowing air. The nailing mechanism (31) is connected to and fixed with the negative pressure fixture (33), which achieves negative pressure by suction and also has a pressure holding function. The bottom of the nailing mechanism (31) is fixed with the pressure nozzle (34).

[0022] Beneficial effects: The nailing mechanism, when used with a positive pressure fixture, can achieve positive pressure nailing; when used with a negative pressure fixture, it can achieve negative pressure nailing; and when used with a nozzle and an injection hole, it can achieve sealing.

[0023] Furthermore, the nailing mechanism (31) includes a nailing rod (311), a displacement sensor (312), a deformation component (313), and a ventilation pipe (314). The displacement sensor (312) is fixed at the top of the nailing rod (311), and the deformation component (313) is fixed at the bottom of the nailing rod (311). The ventilation pipe (314) is sleeved around the nailing rod (311) and the deformation component (313). The top of the ventilation pipe (314) is connected to the positive pressure fixture (32). The pipe body of the ventilation pipe (314) is sleeved with a negative pressure fixture (33) and is connected to the negative pressure fixture (33). The pipe body of the ventilation pipe (314) is sleeved and fixed with a pressure nozzle (34) below the negative pressure fixture (33). The bottom end of the ventilation pipe (314) is open.

[0024] Beneficial effects: By setting up displacement sensors and deformation components, the deformation components are squeezed downward by the nailing rod under positive pressure. The nail rises due to negative pressure and pushes the deformation components to rebound upward, resulting in d1. The movement of the nailing rod and the deformation components is synchronized, and d1 is automatically identified and recorded by the displacement sensor at the top of the nailing rod.

[0025] Furthermore, the deformable component (313) includes a housing (3131) and a liquid medium (3132). The liquid medium (3132) is contained inside the housing (3131), and the top and bottom walls of the housing (3131) are made of plastic material.

[0026] Beneficial effects: By setting the liquid medium and shell material, synchronous movement of the nailing rod and the deformation component can be achieved.

[0027] Furthermore, the plastic material is PP or PE. Attached Figure Description

[0028] Figure 1 This is an assembly diagram of the nailing device, adhesive nails, and long blade battery according to an embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the nailing device according to an embodiment of the present invention. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Example 1

[0032] like Figure 1 As shown, this embodiment provides a nailing method suitable for long blade batteries, including the following steps:

[0033] S1: The nailing device 3 holds the glue nail 2 and transfers the glue nail 2 above the injection hole 11, and the glue nail 2 and the injection hole 11 are aligned.

[0034] S2: The first stage of pre-nailing begins. The nailing device 3 drives the glue nail 2 into the injection hole 11. The nailing depth is H1, the negative pressure is M1, and the pressure holding time is S1.

[0035] S3: After the pressure is broken, the second stage of pre-nailing begins. The nailing device 3 drives the glue nail 2 into the injection hole 11. The nailing depth is H2, the negative pressure is M2, and the pressure holding time is S2.

[0036] S4: After the pressure is broken, the third stage of pre-nailing begins. The nailing device 3 drives the glue nail 2 into the injection hole 11. The nailing depth is H3, the negative pressure is M3, and the pressure holding time is S3.

[0037] S5: After the three pre-nailing operations are completed and the pressure is broken, the nailing device 3 will drive all the glue nails 2 into the injection hole 11.

[0038] S6: The plugging is finished, and the battery is sealed.

[0039] like Figure 1 As shown, the height of the long blade battery 1 is 500-1000mm. An injection hole 11 is provided on the top wall of the long blade battery 1. The nailing device 3 can transport the glue nail 2 into the injection hole 11 for three pre-nailing operations, and at the same time perform stepped negative pressure shaping on the long blade battery 1.

[0040] like Figure 1 , Figure 2 As shown, the nailing device 3 includes a nailing mechanism 31, a positive pressure fixture 32, a negative pressure fixture 33, and a pressure nozzle 34. The top of the nailing mechanism 31 is connected to and fixed with the positive pressure fixture 32, and the top of the nailing mechanism 31 is connected to and fixed with the negative pressure fixture 33. The bottom of the nailing mechanism 31 is fixed with the pressure nozzle 34, which abuts against the injection hole 11 to form a sealed space. The nailing mechanism 31 includes a nailing rod 311, a displacement sensor 312, a deformation component 313, and a ventilation pipe 314. The top of the nailing rod 311 is fixed with the displacement sensor 312, and the bottom of the nailing rod 311 is fixed with the deformation component 313. The ventilation pipe 314 is sleeved around the nailing rod 311 and the deformation component 313. The top of the ventilation pipe 314 is connected to the positive pressure fixture 32, which can blow air to make the nailing rod 311 move downward. A negative pressure fixture 33 is fitted onto the tube body and is connected to the negative pressure fixture 33. A pressure nozzle 34 is fitted and fixed on the tube body of the ventilation pipe 314 below the negative pressure fixture 33. The pressure nozzle 34 abuts against the injection hole 11 to form a sealed space. The bottom end of the ventilation pipe 314 is open. The negative pressure fixture 33 can draw air through the ventilation pipe 314 to form a negative pressure inside the ventilation pipe 314 and inside the sealed space formed by the pressure nozzle 34 and the injection hole 11. The deformation component 313 includes a shell 3131 and a liquid medium 3132. The shell 3131 is filled with the liquid medium 3132. The top and bottom walls of the shell 3131 are made of plastic materials, such as PP or PE. In this embodiment, the shell 3131 is a hollow cylinder. The positive pressure fixture 32 and the negative pressure fixture 33 are existing technologies. The negative pressure fixture 33 also has a pressure holding function.

[0041] Specifically: such as Figure 1 , Figure 2 As shown,

[0042] In step S1, the adhesive nail 2 is held in place by the negative pressure fixture 33, with the negative pressure on the nail between -40 kPa and -50 kPa, and the adhesive nail 2 is transferred to the position directly above the liquid injection hole 11 of the long blade battery 1, thus completing the alignment of the adhesive nail 2 with the liquid injection hole 11.

[0043] In step S2, after the glue nail 2 is aligned, the injection hole 11 is sealed by the contact between the nozzle 34 and the top wall of the long blade battery 1. The first stage of nailing begins. The positive pressure fixture 32 blows out inert gas to push the nailing rod 311 downward to drive the glue nail 2 into the injection hole 11 to a depth of H1. After the glue nail 2 is driven to a certain depth, the negative pressure fixture 33 starts to draw negative pressure. After the negative pressure reaches M1, it starts to hold pressure for a time of S1. After the holding time S1 is reached, the glue nail 2 moves upward due to the negative pressure. d1, the deformation component 313 moves upward accordingly (when the top and bottom walls of the housing 3131 are under positive pressure, they are squeezed downward by the nail rod 311, and the nail 2 rises due to negative pressure, which pushes the bottom wall of the housing 3131 upward, thereby driving the liquid medium 3132 upward. The upward movement of the liquid medium 3132 drives the top wall of the housing 3131 upward, resulting in d1. The movement of the nail rod 311 and the top wall of the housing 3131 are synchronized). d1 is automatically identified and recorded by the displacement sensor 312 at the top of the nail rod 311.

[0044] In step S3, after the first stage of pre-nailing ends and the pressure is broken, the second stage of pre-nailing begins. The positive pressure fixture 32 blows out inert gas to push the nailing rod 311 downward, causing the glue nail 2 to continue to move downward in the injection hole 11, with a nailing depth of H2. After the glue nail 2 is driven to a certain depth, the negative pressure fixture 33 starts to draw negative pressure. After the negative pressure reaches M2, it starts to hold pressure for a holding time of S2. After the holding time S2 is reached, the glue nail 2 moves upward by d2 due to the negative pressure, and the deformation component 313 moves upward by d2 accordingly (same as above). d2 is automatically identified and recorded by the displacement sensor 312 at the top of the nailing rod 311.

[0045] In step S4, after the second stage of pre-nailing ends and the pressure is broken, the third stage of pre-nailing begins. The positive pressure fixture 32 blows out inert gas to push the nailing rod 311 downward so that the glue nail 2 continues to move downward in the injection hole 11, with a nailing depth of H3. After the glue nail 2 is driven into a certain depth, the negative pressure fixture 33 starts to draw negative pressure. After the negative pressure reaches M3, pressure holding begins, with a pressure holding time of S3.

[0046] The holding pressure M1 is lower than M2 and lower than M3 (referring to the actual working conditions), and the value range of M1 is -10 kPa to -30 kPa, the value range of M2 is -20 kPa to -50 kPa, and the value range of M3 is -30 kPa to -70 kPa.

[0047] The pressure holding time is S1 > S2 > S3, and the value of S1 ranges from 4 to 6 seconds, the value of S2 ranges from 2 to 4 seconds, and the value of S3 ranges from 1 to 2 seconds.

[0048] H1+H2+H3 is 0.5L-0.8L, where L is the length of the adhesive nail (2);

[0049] Three stages of pre-nailing and stepped negative pressure holding prevent electrolyte loss due to excessive negative pressure and poor battery shaping and prolonged processing time due to insufficient negative pressure. The first stage involves shallow nailing, combined with low negative pressure and a longer holding time, preventing rapid extraction of electrolyte from the bottom of the battery. During the negative pressure process, the battery is shaped, and the electrolyte fills the entire cell body due to the negative pressure, achieving a secondary wetting effect. After the pressure is broken, some free electrolyte will flow to the bottom of the battery due to gravity. At this point, the second stage of pre-nailing is performed, and a second cycle of negative pressure shaping is carried out to ensure that the electrolyte is in a back-and-forth motion inside the battery and is not extracted. After the pressure is broken, some free electrolyte will flow to the bottom of the battery due to gravity. At this point, the third stage of pre-nailing is performed. The third stage involves deeper nailing, combined with high negative pressure and a shorter holding time, to ensure that the electrolyte is evenly distributed inside the battery and is not extracted. After three stages of pre-nailing and stepped negative pressure shaping, the battery thickness and electrolyte loss are controlled.

[0050] H1, H2, and H3 must satisfy the following formula:

[0051] H1 = 1 / 3L;

[0052] H2 = d1 + ε1H1;

[0053] H3 = d2 + ε2H2;

[0054] Where L is the length of the glue nail 2; ε1 is the primary pre-nailing depth compensation coefficient, ε1 = the cross-sectional area of ​​the glue nail 2 at depth H1 and the injection hole 11 / the area of ​​the injection hole 11 (based on process verification, it is the area exposed after pre-nailing, which determines the amount of gas coming out), the value of ε1 is 0-1, and here the cross-sectional diameter of the glue nail 2 and the injection hole 11 corresponds to H1 according to the specifications of the glue nail 2; ε2 is the secondary pre-nailing depth compensation coefficient, ε2 = the cross-sectional area of ​​the glue nail 2 at depth H2 and the injection hole 11 / the area of ​​the injection hole 11 (based on process verification, it is the area exposed after pre-nailing, which determines the amount of gas coming out), the value of ε2 is 0-1, and here the cross-sectional diameter of the glue nail 2 and the injection hole 11 corresponds to H2 according to the specifications of the glue nail 2; d1 and d2 are identified by the displacement sensor 312;

[0055] The nailing depth of the three pre-nailing operations satisfies the above formula, which can further ensure that the electrolyte is evenly distributed inside the battery and is not extracted.

[0056] Example 2

[0057] Based on Example 1, this example uses a long blade battery 1 with a height of 580mm, an injection hole 11 with a diameter of 7.5mm, and a glue nail 2 with a length of 4.5mm.

[0058] like Figure 1 , Figure 2 As shown,

[0059] First, the negative pressure fixture 33 uses a negative pressure of -45 kPa to pick up the glue nail 2 at the bottom of the deformation component 313. Then, the glue nail 2 is transferred to the top of the liquid injection hole 11, and the glue nail 2 and the liquid injection hole 11 are aligned. At the same time as the alignment is completed, the nozzle 34 presses the top wall of the long blade battery 1 to ensure the relative position and sealing of the glue nail 2 and the liquid injection hole 11 during the pre-nailing and full nailing process.

[0060] The first stage of pre-nailing begins. The positive pressure fixture 32 blows out nitrogen gas to push the nailing rod 311 downward to drive the glue nail 2 into the injection hole 11. The nailing depth H1 = 1.5 mm. The cross-sectional diameter of the glue nail 2 and the injection hole 11 is 4.5 mm, so ε1 = 0.36. After the pre-nailing is completed, the negative pressure fixture 33 draws negative pressure to the battery to M1 = -20 kPa and holds the pressure for 4 seconds. After the pressure holding is completed, the glue nail 2 moves upward due to the negative pressure. The upward movement distance d1 = 0.25 mm (indicated by the displacement sensor 312).

[0061] After the pressure is broken, the second stage of pre-nailing begins. The positive pressure fixture 32 blows out nitrogen gas to push the nailing rod 311 downward, so that the glue nail 2 continues to move downward in the injection hole 11. The secondary nailing depth H2 = 0.25 + 0.36 × 1.5 mm = 0.79 mm. The diameter of the glue nail 2 and the injection hole 11 is 4.8 mm, so ε2 = 0.41. After the secondary pre-nailing is completed, the negative pressure fixture 33 draws negative pressure to the battery to M2 = -30 kPa and holds the pressure for 2 seconds. After the pressure holding is completed, the glue nail moves upward due to the negative pressure. The upward movement distance d2 = 0.32 mm (indicated by the displacement sensor 312).

[0062] After the pressure is broken, the third stage of pre-nailing begins. The positive pressure fixture 32 blows out nitrogen gas to push the nailing rod 311 downward, so that the glue nail 2 continues to move downward in the injection hole 11. The nailing depth of the three times is H3 = 0.32 + 0.41 × 0.79 mm = 0.64 mm. After the three pre-nailings are completed, the negative pressure fixture 33 draws negative pressure to the battery to M3 = -50 kPa and holds the pressure for 1 second. After the pressure holding is completed, the pressure is broken. At this point, the pre-nailing stage ends and the long blade battery 1 is shaped.

[0063] After the pre-nailing stage is completed, the positive pressure fixture 32 blows out nitrogen gas to push the nailing rod 311 down so that the glue nail 2 is completely inserted into the liquid injection hole 11. The nailing is completed and the long blade battery 1 is transferred to the sealing welding process to complete the sealing welding.

[0064] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A nailing method suitable for long blade batteries, characterized in that, Includes the following steps: S1 is completed by using the nailing device (3) to hold the glue nail (2) and align it with the injection hole (11); S2 The first stage of pre-nailing begins, the nailing device (3) drives the glue nail (2) into the injection hole (11), the nailing depth is H1, the negative pressure is M1, and the pressure holding time is S1; After S3 pressure is broken, the second stage of pre-nailing begins. The nailing device (3) drives the glue nail (2) into the injection hole (11), the nailing depth is H2, the negative pressure is M2, and the pressure holding time is S2. After S4 pressure is broken, the third stage of pre-nailing begins. The nailing device (3) drives the glue nail (2) into the injection hole (11), the nailing depth is H3, the negative pressure is M3, and the pressure holding time is S3. After the three pre-nailing steps of S5 are completed and the pressure is broken, the nailing device (3) will drive all the glue nails (2) into the injection hole (11); H1+H2+H3 is 0.5L-0.8L, where L is the length of the rubber nail (2), the holding pressure M1 is lower than M2 and lower than M3, and the holding time is S1>S2>S3.

2. The nailing method for a long blade battery according to claim 1, characterized in that: In S2, after the holding time S1 is reached, the glue nail (2) will move up by d1 due to the negative pressure. The deformation component (313) of the nailing device (3) will move up by d1 accordingly. d1 is identified and recorded by the displacement sensor (312). Similarly, d2 is obtained in S3. H1, H2 and H3 need to satisfy the following formulas: H1 = 1 / 3L; H2 = d1 + ε1H1; H3 = d2 + ε2H2; where ε1 is the first pre-nailing depth compensation coefficient, ε1 = the cross-sectional area of ​​the glue nail (2) at depth H1 and the injection hole (11) / the area of ​​the injection hole (11), and the value of ε1 is 0-1; ε2 is the second pre-nailing depth compensation coefficient, ε2 = the cross-sectional area of ​​the glue nail (2) at depth H2 and the injection hole (11) / the area of ​​the injection hole (11), and the value of ε2 is 0-1.

3. The nailing method for a long blade battery according to claim 1, characterized in that: The value range of M1 is -10 kPa to -30 kPa; the value range of M2 is -20 kPa to -50 kPa; and the value range of M3 is -30 kPa to -70 kPa.

4. The nailing method for a long blade battery according to claim 1, characterized in that: S1 ranges from 4 to 6 seconds, S2 ranges from 2 to 4 seconds, and S3 ranges from 1 to 2 seconds.

5. The nailing method for a long blade battery according to claim 1, characterized in that: In S1, the negative pressure of the suction pin is between -40 kPa and -50 kPa.

6. The nailing method for a long blade battery according to claim 1, characterized in that: In S2, before the first stage of nailing begins, the injection hole (11) is sealed by the pressure nozzle (34) of the nailing device (3) abutting against the top wall of the long blade battery (1).

7. The nailing method for a long blade battery according to claim 1, characterized in that: The nailing device (3) includes a nailing mechanism (31), a positive pressure fixture (32), a negative pressure fixture (33), and a pressure nozzle (34). The top of the nailing mechanism (31) is connected to and fixed with the positive pressure fixture (32), which nails by blowing air. The nailing mechanism (31) is connected to and fixed with the negative pressure fixture (33), which achieves negative pressure by suction and also has a pressure holding function. The bottom of the nailing mechanism (31) is fixed with the pressure nozzle (34).

8. A nailing method for a long blade battery according to claim 7, characterized in that: The nailing mechanism (31) includes a nailing rod (311), a displacement sensor (312), a deformation component (313), and a ventilation pipe (314). The displacement sensor (312) is fixed at the top of the nailing rod (311), and the deformation component (313) is fixed at the bottom of the nailing rod (311). The ventilation pipe (314) is sleeved around the nailing rod (311) and the deformation component (313). The top of the ventilation pipe (314) is connected to the positive pressure fixture (32). The pipe body of the ventilation pipe (314) is sleeved with a negative pressure fixture (33) and is connected to the negative pressure fixture (33). The pipe body of the ventilation pipe (314) is sleeved and fixed with a pressure nozzle (34) below the negative pressure fixture (33). The bottom end of the ventilation pipe (314) is open.

9. A nailing method suitable for long blade batteries according to claim 8, characterized in that: The deformable component (313) includes a housing (3131) and a liquid medium (3132). The liquid medium (3132) is contained inside the housing (3131). The top and bottom walls of the housing (3131) are made of plastic material.

10. A nailing method for a long blade battery according to claim 9, characterized in that: The plastic material is PP or PE.

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