Nailing method suitable for long-blade battery

Abstract

The invention provides a nailing method suitable for a long-blade battery. The nailing method comprises the following steps that S1, a nailing device sucks a plastic nail to be aligned with a liquid injection hole; s2, first-stage pre-nailing is started, a nailing device is used for nailing a plastic nail into a liquid injection hole, the nailing depth is H1, the negative pressure is M1, and the pressure maintaining time is S1; s3, after pressure breaking, second-stage pre-nailing is started, a nailing device is used for nailing a plastic nail into a liquid injection hole, the nailing depth is H2, the negative pressure is M2, and the pressure maintaining time is S2; s4, after pressure breaking, third-stage pre-nailing is started, a nailing device is used for nailing a plastic nail into a liquid injection hole, the nailing depth is H3, the negative pressure is M3, and the pressure maintaining time is S3; s5, after the third-time pre-nailing is finished and crushing is carried out, the nailing device is used for nailing all the plastic nails into the liquid injection holes; h1 + H2 + H3 is 0.5 L-0. 8L, L is the length of the rubber nail, the dwell pressure M1 is lower than M2 and lower than M3, and the dwell time S1 > S2 > S3. After three times of pre-nailing and stepped negative pressure shaping, the thickness and liquid loss of the battery are controlled.

Description

Technical Field

[0001] The invention relates to the technical field of lithium ion batteries, in particular to a nailing method suitable for long blade batteries. Background Art

[0002] Nailing after secondary liquid injection is a key process in the lithium-ion manufacturing process, which directly affects the yield of battery sealing welding. At present, the industry mainly adopts negative pressure nailing. For square batteries, the sealing nails are generally driven directly into the liquid injection hole by negative pressure. For example, the comparative document with publication number CN105932219A discloses a helium injection nailing device and method for aluminum shell batteries. The device includes a base, a vacuum sealing cavity, a horizontal guide rod, a battery fixture, a fixture cylinder, a helium injection mechanism, a nailing mechanism and a sealing cavity vacuum pumping device. The method is battery loading-placing sealing nails-closing the vacuum sealing cavity-vacuuming and injecting helium inside the battery-pressing in the sealing nails-removing the battery.

[0003] As for blade batteries, most of them adopt the method of first pumping negative pressure on the battery to shape it and then nailing it; this method is mainly used because the shell of the current blade battery is relatively thin and positive pressure injection is adopted in a standing manner, which causes the blade battery shell to swell after the secondary injection. Therefore, the direct nailing method cannot be used, and negative pressure needs to be pumped out for shaping; however, for long blade batteries (length exceeding 500mm), the effect of using negative pressure to shape the shell after injection is poor, large negative pressure can easily draw out the electrolyte, and small negative pressure shaping effect is not obvious, resulting in the battery thickness exceeding the standard; currently there is no nailing method suitable for long blade batteries in the existing technology. Summary of the invention

[0004] The technical problem to be solved by the present invention is how to ensure the shaping effect of the battery while preventing the electrolyte from being sucked out.

[0005] The present invention solves the above technical problems through the following technical means:

[0006] A nailing method suitable for a long blade battery comprises the following steps:

[0007] S1 is completed by sucking the plastic nail (2) and aligning the injection hole (11) through the nailing device (3);

[0008] S2: The first stage of pre-nailing begins, the nailing device (3) drives the rubber nail (2) into the injection hole (11), the nailing depth is H1, the negative pressure is M1, and the pressure holding time is S1;

[0009] After S3 breaks the pressure, the second stage of pre-nailing begins, and the nailing device (3) drives the rubber nail (2) into the injection hole (11), with a nailing depth of H2, a negative pressure of M2, and a pressure holding time of S2;

[0010] After S4 breaks the pressure, the third stage of pre-nailing begins, and the nailing device (3) drives the rubber nail (2) into the injection hole (11), with a nailing depth of H3, a negative pressure of M3, and a pressure holding time of S3;

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

[0012] H1+H2+H3 is 0.5L-0.8L, 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 S1>S2>S3.

[0013] Beneficial effects: Through three pre-nailing and step negative pressure pressure maintenance, the loss of fluid caused by excessive negative pressure and the poor battery shaping effect and long process time caused by too small negative pressure are avoided; the first stage glue nail is shallow, with low negative pressure and a long time of pressure maintenance, the battery liquid at the bottom of the battery will not be quickly extracted, the battery is shaped during the negative pressure process, and the electrolyte is filled into the entire body of the battery cell due to the negative pressure, which plays a secondary infiltration role; after the pressure is broken, the free electrolyte will partially flow to the bottom of the battery due to gravity. At this time, the second stage pre-nailing is carried out, and the secondary cycle negative pressure shaping is carried out to ensure that the electrolyte is in a reciprocating state inside the battery without being extracted; after the pressure is broken, the free electrolyte will partially flow to the bottom of the battery due to gravity. At this time, the three-stage pre-nailing is carried out, and the third stage glue nail is deep, with high negative pressure and a short time of pressure maintenance, to ensure that the electrolyte is evenly distributed inside the battery without being extracted; after three pre-nailing and step negative pressure shaping, the battery thickness and fluid loss are controlled.

[0014] Furthermore, in S2, after the holding time S1 is reached, the glue nail (2) moves up d1 due to the negative pressure, and the deformation component (313) of the nailing device (3) moves up d1 accordingly, and 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; wherein ε1 is a primary pre-nail depth compensation coefficient, ε1=cross-sectional area of ​​the glue nail (2) at the depth of H1 and the injection hole (11) / area of ​​the injection hole (11), and the value of ε1 is 0-1; ε2 is a secondary pre-nail depth compensation coefficient, ε2=cross-sectional area of ​​the glue nail (2) at the depth of H2 and the injection hole (11) / area of ​​the injection hole (11), and the value of ε2 is 0-1.

[0015] Beneficial effect: The nailing depth of the three pre-nailings satisfies the above formula, which is obtained based on process verification and can further ensure that the electrolyte is evenly distributed inside the battery without being extracted.

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

[0017] Furthermore, the value range of S1 is 4 to 6 s, the value range of S2 is 2 to 4 s, and the value range of S3 is 1 to 2 s.

[0018] Furthermore, in S1, the nail suction negative pressure is between -40kpa and -50kpa.

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

[0020] Beneficial effect: After sealing by the pressure nozzle, positive pressure nailing and negative pressure shaping can be achieved.

[0021] Furthermore, the nailing device (3) comprises a nailing mechanism (31), a positive pressure tool (32), a negative pressure tool (33), and a pressure nozzle (34). The top of the nailing mechanism (31) is connected and fixed with the positive pressure tool (32), and the positive pressure tool (32) realizes nailing by blowing air. The nailing mechanism (31) is connected and fixed with a negative pressure tool (33), and the negative pressure tool (33) realizes negative pressure by suction and has a pressure maintaining function. The bottom of the nailing mechanism (31) is fixed with a pressure nozzle (34).

[0022] Beneficial effects: the nailing mechanism cooperates with the positive pressure tooling to achieve positive pressure nailing, the nailing mechanism cooperates with the negative pressure tooling to achieve negative pressure nailing, and the pressure nozzle cooperates with the injection hole to achieve sealing.

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

[0024] Beneficial effect: Through the setting of displacement sensor and deformation component, the deformation component is squeezed downward by the nailing rod under positive pressure, and the increase of negative pressure due to the extraction of the rubber nail will push the deformation component to rebound upward to obtain d1. The movement of the nailing rod and the deformation component is synchronized, and d1 is automatically identified and recorded by the displacement sensor at the top of the nailing rod.

[0025] Furthermore, the deformation component (313) includes a shell (3131) and a liquid medium (3132). The shell (3131) contains the liquid medium (3132). The top wall and the bottom wall of the shell (3131) are both made of plastic material.

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

[0027] Furthermore, the plastic material is PP or PE. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is an assembly diagram of the nailing device, the rubber nail, and the long blade battery of the embodiment of the present invention;

[0029] Figure 2 Schematic diagram of a nailing device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Embodiment 1

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

[0033] S1: The nailing device 3 sucks the plastic nail 2 and transfers the plastic nail 2 to above the injection hole 11, and the plastic nail 2 and the injection hole 11 are aligned;

[0034] S2: The first stage of pre-nailing begins, the nailing device 3 drives the rubber 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, and the nailing device 3 drives the rubber 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, and the nailing device 3 drives the rubber 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 drives all the rubber nails 2 into the injection hole 11;

[0038] S6: Nailing is completed and the battery is sealed.

[0039] like Figure 1 As shown, the height of the long blade battery 1 is 500-1000mm, and a liquid injection hole 11 is opened on the top wall of the long blade battery 1. The nailing device 3 can transport the glue nail 2 into the liquid injection hole 11 for three pre-nailing, and at the same time perform step 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 tooling 32, a negative pressure tooling 33, and a pressure nozzle 34. The top of the nailing mechanism 31 is connected and fixed with the positive pressure tooling 32, the upper end of the nailing mechanism 31 is connected and fixed with the negative pressure tooling 33, and the bottom of the nailing mechanism 31 is fixed with the pressure nozzle 34, and the pressure nozzle 34 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, the bottom end of the nailing rod 311 is fixed with the deformation component 313, and the outer periphery of the nailing rod 311 and the deformation component 313 is provided with a ventilation pipe 314. The top of the ventilation pipe 314 is connected with the positive pressure tooling 32, and the positive pressure tooling 32 can blow air to move the nailing rod 311 downward. The ventilation pipe 314 A negative pressure tooling 33 is sleeved on the tube body and is connected to the negative pressure tooling 33. A pressure nozzle 34 is sleeved and fixed on the tube body of the ventilation pipe 314 below the negative pressure tooling 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 opened. The negative pressure tooling 33 can suck air through the ventilation pipe 314 to form a negative pressure in the air pipe 314 and in 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 liquid medium 3132. The top wall and bottom wall of the shell 3131 are made of plastic materials, such as PP or PE. The shell 3131 in this embodiment is a hollow cylinder; the positive pressure tooling 32 and the negative pressure tooling 33 are existing technologies, and the negative pressure tooling 33 also has a pressure maintaining function.

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

[0042] In step S1, the glue nail 2 is sucked by the negative pressure tool 33, the suction pressure is between -40kpa and -50kpa, and the glue nail 2 is transferred to the top of the injection hole 11 of the long blade battery 1, and the glue nail 2 and the injection hole 11 are aligned;

[0043] In step S2, after the glue nail 2 is aligned, the sealing of the injection hole 11 is achieved by the contact between the pressure nozzle 34 and the top wall of the long blade battery 1, and the first stage of nailing begins. The positive pressure tool 32 blows out inert gas to push the nail rod 311 downward to drive the glue nail 2 into the injection hole 11, and the nailing depth is H1; after the glue nail 2 is driven into a certain depth, the negative pressure tool 33 starts to pump negative pressure, and after the negative pressure reaches M1, the pressure is maintained for a time of S1; after the pressure maintenance time S1 is reached, the glue nail 2 moves up due to the negative pressure d1, the deformation component 313 moves up accordingly (the top and bottom walls of the shell 3131 are squeezed downward by the nailing rod 311 under positive pressure, and the rubber nail 2 pushes the bottom wall of the shell 3131 upward due to the increase of negative pressure, thereby driving the liquid medium 3132 upward, and the upward movement of the liquid medium 3132 drives the top wall of the shell 3131 to move up to obtain d1, and the movement of the nailing rod 311 and the top wall of the shell 3131 are synchronized), d1 is automatically recognized and recorded by the displacement sensor 312 at the top of the nailing rod 311;

[0044] In step S3, the first stage of pre-nailing is completed, and after the pressure is broken, the second stage of pre-nailing begins. The positive pressure tool 32 blows out inert gas to push the nail rod 311 downward so that the glue nail 2 continues to move downward in the injection hole 11, and the nailing depth is H2; after the glue nail 2 is driven into a certain depth, the negative pressure tool 33 starts to pump negative pressure, and after the negative pressure reaches M2, it starts to maintain the pressure for a time of S2; after the pressure maintenance time S2 is reached, the glue nail 2 will move up by d2 due to the negative pressure, and the deformation component 313 will move up by d2 accordingly (same as above), and d2 is automatically recognized and recorded by the displacement sensor 312 at the top of the nail rod 311;

[0045] In step S4, the second stage of pre-nailing is completed, and after the pressure is broken, the third stage of pre-nailing begins. The positive pressure tooling 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, and the nailing depth is H3; after the glue nail 2 is driven into a certain depth, the negative pressure tooling 33 starts to draw negative pressure, and after the negative pressure reaches M3, the pressure is maintained for a time of S3.

[0046] The holding pressure M1 is lower than M2 and lower than M3 (refers to the high and low in actual working conditions), and the value range of M1 is -10kpa to -30kpa, the value range of M2 is -20kpa to -50kpa; the value range of M3 is -30kpa to -70kpa;

[0047] The holding time S1>S2>S3, and the value range of S1 is 4~6s, the value range of S2 is 2~4s, and the value range of S3 is 1~2s;

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

[0049] Three pre-nailing and step negative pressure holding can avoid the loss of liquid caused by excessive negative pressure and the poor battery shaping effect and long process time caused by too small negative pressure. The glue nails in the first stage are shallow, with low negative pressure and long time of holding pressure, so that the battery liquid at the bottom of the battery will not be quickly extracted. The battery is shaped during the negative pressure process. At the same time, the electrolyte is filled into the entire body of the battery cell due to the negative pressure, which plays a secondary infiltration role. After the pressure is broken, the free electrolyte will partially flow to the bottom of the battery due to gravity. At this time, the second stage of pre-nailing is carried out, and the secondary circulation negative pressure shaping is carried out to ensure that the electrolyte is in a reciprocating state inside the battery without being extracted. After the pressure is broken, the free electrolyte will partially flow to the bottom of the battery due to gravity. At this time, the three-stage pre-nailing is carried out. The glue nails in the third stage are deep, with high negative pressure and short time of holding pressure, to ensure that the electrolyte is evenly distributed inside the battery without being extracted. After three pre-nailing and step negative pressure shaping, the battery thickness and liquid 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] Wherein, L is the length of the glue nail 2; ε1 is the primary pre-nail depth compensation coefficient, ε1=the cross-sectional area of ​​the glue nail 2 and the injection hole 11 when it is at the depth of H1 / the area of ​​the injection hole 11 (based on process verification, it is the area exposed by the injection hole after pre-nail, and this area determines the amount of gas coming out), the value of ε1 is 0-1, and 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-nail depth compensation coefficient, ε2=the cross-sectional area of ​​the glue nail 2 and the injection hole 11 when it is at the depth of H2 / the area of ​​the injection hole 11 (based on process verification, it is the area exposed by the injection hole after pre-nail, and this area determines the amount of gas coming out), the value of ε2 is 0-1, and 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-nailings satisfies the above formula, which can further ensure that the electrolyte is evenly distributed inside the battery without being drawn out.

[0056] Embodiment 2

[0057] On the basis of the first embodiment, this embodiment adopts a long blade battery 1 with a height of 580 mm, a liquid injection hole 11 with a diameter of 7.5 mm, and a glue nail 2 with a length of 4.5 mm.

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

[0059] First, the negative pressure tool 33 absorbs the glue nail 2 at the bottom of the deformation component 313 with a negative pressure of -45kpa, and then transfers the glue nail 2 to the top of the injection hole 11, and completes the alignment of the glue nail 2 and the injection hole 11. When the alignment is completed, the pressing 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 injection hole 11 during the pre-nailing and full-nailing process;

[0060] At the beginning of the first stage of pre-nailing, the positive pressure tool 32 blows out nitrogen to push the nail rod 311 downward to drive the glue nail 2 into the injection hole 11. The nailing depth H1 = 1.5 mm, and 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 tool 33 pumps negative pressure to the battery to M1 = -20 kpa and maintains the pressure for 4 seconds. After the pressure maintenance is completed, the glue nail 2 moves up due to the negative pressure, and the upward movement distance d1 = 0.25 mm (obtained from the feedback of the displacement sensor 312);

[0061] After the pressure is broken, the second stage of pre-nailing begins. The positive pressure tool 32 blows out nitrogen to push the nail rod 311 downward so that the rubber 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 cross-sectional diameter of the rubber 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 tool 33 pumps negative pressure to the battery to M2 = -30 kpa and maintains the pressure for 2 seconds. After the pressure maintenance ends, the rubber nail moves up due to the negative pressure, and the upward movement distance d2 = 0.32 mm (obtained from the feedback of the displacement sensor 312);

[0062] After the pressure is broken, the third stage of pre-nailing begins. The positive pressure tool 32 blows out nitrogen to push the nail rod 311 downward so that the glue nail 2 continues to move downward in the injection hole 11. The three nailing depths are H3 = 0.32 + 0.41 × 0.79 mm = 0.64 mm. After the three pre-nailings are completed, the negative pressure tool 33 pumps the negative pressure of the battery to M3 = -50 kpa and maintains the pressure for 1 second. After the pressure maintenance ends, the pressure is broken. At this point, the pre-nailing stage ends and the shaping of the long blade battery 1 is completed;

[0063] After the pre-nailing stage is completed, the positive pressure tooling 32 blows out nitrogen to push the nailing rod 311 downward so that the glue nail 2 completely enters the 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, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions 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: The following steps are involved: S1 is completed by sucking the plastic nail (2) and aligning the injection hole (11) through the nailing device (3); S2: The first stage of pre-nailing begins, the nailing device (3) drives the rubber 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 breaks the pressure, the second stage of pre-nailing begins, and the nailing device (3) drives the rubber nail (2) into the injection hole (11), with a nailing depth of H2, a negative pressure of M2, and a pressure holding time of S2; After S4 breaks the pressure, the third stage of pre-nailing begins, and the nailing device (3) drives the rubber nail (2) into the injection hole (11), with a nailing depth of H3, a negative pressure of M3, and a pressure holding time of S3; S5 After the three pre-nailing steps are completed and the pressure is broken, the nailing device (3) drives all the rubber nails (2) into the injection hole (11); H1+H2+H3 is 0.5L-0.8L, 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 S1>S2>S3.

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

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

4. A nailing method suitable for long blade batteries according to claim 1, characterized in that: The value range of S1 is 4 to 6 seconds, the value range of S2 is 2 to 4 seconds, and the value range of S3 is 1 to 2 seconds.

5. A nailing method suitable for long blade batteries according to claim 1, characterized in that: In S1, the suction nail negative pressure is between -40kpa and -50kpa.

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

7. A nailing method suitable for long blade batteries according to claim 1, characterized in that: The nailing device (3) comprises a nailing mechanism (31), a positive pressure tool (32), a negative pressure tool (33), and a pressure nozzle (34). The top of the nailing mechanism (31) is connected and fixed with the positive pressure tool (32), and the positive pressure tool (32) realizes nailing by blowing air. The nailing mechanism (31) is connected and fixed with a negative pressure tool (33), and the negative pressure tool (33) realizes negative pressure by suction and has a pressure maintaining function. The bottom of the nailing mechanism (31) is fixed with a pressure nozzle (34).

8. A nailing method suitable for long blade batteries according to claim 7, characterized in that: The nailing mechanism (31) comprises a nailing rod (311), a displacement sensor (312), a deformation assembly (313), and a ventilation pipe (314). The displacement sensor (312) is fixed to the top end of the nailing rod (311), the deformation assembly (313) is fixed to the bottom end of the nailing rod (311), the ventilation pipe (314) is sleeved around the nailing rod (311) and the deformation assembly (313), the top of the ventilation pipe (314) is connected to the positive pressure tooling (32), the pipe body of the ventilation pipe (314) is sleeved with a negative pressure tooling (33) and is connected to the negative pressure tooling (33), a pressure nozzle (34) is sleeved and fixed on the pipe body of the ventilation pipe (314) below the negative pressure tooling (33), and 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 deformation component (313) comprises a shell (3131) and a liquid medium (3132). The shell (3131) contains the liquid medium (3132). The top wall and the bottom wall of the shell (3131) are both made of plastic material.

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

Images