Battery steel shell stretching process and stretching device thereof

Abstract

The invention discloses a battery steel shell stretching process and a stretching device thereof.The battery steel shell stretching process comprises the following steps that SP1, plate feeding is conducted, specifically, plates used for stretching are put into a feeding unit, and the feeding unit conveys the plates to a carrying unit in sequence; sP2, the steel shell is stretched, specifically, the carrying unit conveys the plate into the main body, the plate is stretched through the stretching unit, and meanwhile the stretched steel shell is conveyed to a discharging opening; sP3, the steel scraps are separated, specifically, the steel shells are conveyed into a scrap removing unit through a conveying belt at a discharging opening, and the steel shells and the steel scraps are separated through the electrostatic adsorption principle; and SP3, the steel scraps are collected, and the scraps are separated and fall into a dust collection box on the lower portion through a mechanical scraping means by means of the scrap removing unit fully adsorbing the steel scraps. The scrap removing unit is arranged, the steel shells and steel scraps are separated according to the electrostatic adsorption principle, the situation that the surfaces of the battery steel shells are damaged due to collision is avoided, the appearance quality and structural integrity of the battery steel shells are guaranteed, the yield is increased, the process is quiet and free of noise, and the workshop operation environment is improved.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of battery shell production, and specifically to a battery steel shell stretching process and a stretching device thereof. Background Art

[0002] Battery steel shell is a high-strength, corrosion-resistant material designed for battery shell stamping. It has excellent physical stability and pressure resistance, can effectively protect the battery core, and improve battery safety and service life. At the same time, it has low production costs and is easy to recycle, and is widely used in medical devices, smart wearable devices and other fields; the stretching die device is a die used for stretching and forming materials such as metals or plastics. It has the characteristics of high stability, high rigidity, and high precision. It can produce holes or products of various shapes and sizes, and is widely used in the automotive, aerospace, electronics, machinery and other manufacturing industries.

[0003] The existing technology discloses a battery steel shell stretching die, including a stretching device, the outer wall of the stretching device is fixedly connected to a moving device, a hole is opened on the back of the stretching device, and a swing mechanism is fixedly connected to the back of the stretching device near the hole. The battery steel shell stretching die, through the setting of the protrusion at the bottom of the toggle block, will hit the toggle rod during the rotation of the toggle block, and the filter bucket will drive the internal steel shell to move during the swinging process, accelerating the separation of debris from the steel shell, and the swinging of the filter bucket will also make the accumulated steel shell move, reducing the accumulation of the steel shell, and then causing the debris on the steel shell to fall off, accelerating the cleaning efficiency of the debris on the steel shell, the toggle rod is squeezed by the toggle block to drive the left side of the filter bucket to lift, and the slider is located on the slide rail and moves, and at this time the movement of the filter bucket drives the internal steel shell to move left and right.

[0004] However, the stretching device in the above technology relies on the swing of the filter bucket to make the debris on the steel shell fall off. During this process, the steel shells in the filter bucket collide with each other, which may cause damage to their surfaces, affecting the quality of the battery steel shell, reducing the product yield, and increasing production costs; and the device is difficult to adapt to battery steel shells of different sizes and shapes, which limits the scope of application of the device and cannot meet diverse market demands. Summary of the invention

[0005] The present invention mainly provides a battery steel shell stretching process and a stretching device thereof, so as to solve the technical problems raised in the above background technology.

[0006] The technical solution adopted by the present invention to solve the above technical problems is: A battery steel shell stretching process comprises the following steps: SP1, plate loading, put the plate used for stretching into the loading unit, and the loading unit transports the plate to the main body in turn; SP2, steel shell stretching, the handling unit transports the plate into the main body for stretching through the stretching unit, and at the same time transports the stretched steel shell to the discharge port; SP3, separation of steel chips. The conveyor belt at the discharge port transports the steel shell to the chip removal unit, and separates the steel shell and steel chips through the principle of electrostatic adsorption; SP4. Collect steel chips. The chip removal unit that is full of steel chips uses mechanical scraping to separate the chips and drop them into the dust collection box below.

[0007] A stretching device for the above-mentioned battery steel shell stretching process, the chip removal unit mentioned in SP3 is connected to the main body through the conveyor belt, and the chip removal unit includes an electrostatic generating unit and a shell, the electrostatic generating unit is arranged on the side wall of the discharge port, an adsorption roller is arranged in the shell, a scraper plate is arranged inside the adsorption roller, and a gear ring is arranged outside the adsorption roller, the gear ring is meshingly connected to the drive unit, and a dust box is also arranged in the shell, and the dust box is located directly below the adsorption roller.

[0008] Furthermore, the adsorption roller is made of silica gel material, and a conductive coating is provided on the inner surface of the adsorption roller; The scraping plate is arranged at a position of the adsorption roller corresponding to the dust collecting box, and a curved rubber block is arranged on the contact surface between the scraping plate and the adsorption roller.

[0009] Furthermore, the drive unit includes a drive motor, an output end of the drive motor is connected to a driving gear, the driving gear is connected to a driven gear via a chain transmission, the driven gear is connected to a transmission gear via a rotating shaft transmission, and the transmission gear is meshingly connected to the ring gear.

[0010] Furthermore, the stretching unit mentioned in SP2 includes an upper mold and a lower mold, and the upper mold and the lower mold are detachably connected to the main body through a connecting component, and the number and position of the upper mold and the lower mold correspond to each other. In addition, a return unit is provided in the lower mold.

[0011] Further, the connection assembly includes an electromagnetic adsorption unit and a mechanical locking unit, the electromagnetic adsorption unit is composed of an electromagnetic coil and a magnetic conductive metal plate, the electromagnetic coil is installed on a base, the base is provided at the output end of the electric telescopic rod, the electric telescopic rod is provided in the top wall of the main body, and the magnetic conductive metal plate is installed on the top of the upper mold; The mechanical locking unit comprises a locking pin and a locking hole, wherein the locking pin is arranged on the side surface of the base, and the locking hole is arranged on the top side surface of the upper mold.

[0012] Furthermore, the material return unit includes a material receiving plate, which is located in the lower mold, and the bottom of the material receiving plate is connected to one end of a second spring, and the other end of the second spring is connected to the inner bottom wall of the lower mold.

[0013] Furthermore, the loading unit mentioned in SP1 includes a silo, a pushing port is provided at the bottom of the silo, and a pushing trough is provided at the bottom of the silo, a pushing screw is provided in the pushing trough, one end of the pushing screw is transmission-connected to the pushing motor, and the other end is rotatably connected to the main body, and a matching pushing block is sleeved on the pushing screw.

[0014] Furthermore, the push block is a hollow rectangular block with an open top, and an arc block is provided inside the push block, the bottom of the arc block is connected to one end of a first spring, and the other end of the first spring is connected to the inner bottom wall of the push block.

[0015] Furthermore, the transporting unit mentioned in SP2 includes a pair of parallel slide grooves, each of which is provided with a transport screw rod, one end of the transport screw rod is connected to a transport motor, and the other end is rotatably connected to the inner wall of the slide groove away from the transport motor, and three pairs of matching jaws are sleeved on the transport screw rod, and the three pairs of jaws are provided with clamping telescopic rods, and the three pairs of jaws are interconnected by connecting rods.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention separates the steel shell and steel chips by setting a chip removal unit and using the principle of electrostatic adsorption, thereby avoiding damage to the surface of the battery steel shell due to collision, ensuring the appearance quality and structural integrity of the battery steel shell, and improving the yield rate. In addition, the process is quiet and noiseless, which improves the workshop working environment.

[0017] 2. The upper and lower molds of the stretching unit provided in the present invention are detachably and firmly connected through the electromagnetic adsorption unit and the mechanical locking unit. The electromagnetic adsorption unit allows the mold to be quickly put into place, greatly shortening the mold change time. The mechanical locking unit ensures that the mold will not loosen or shift due to vibration or impact during high-intensity stretching operations. The two complement each other and improve the reliability of fixation. When it is necessary to produce battery steel shells of different specifications, the corresponding molds can be quickly replaced, and the production line does not need large-scale transformation to adapt to diversified production tasks.

[0018] 3. The chip removal unit provided in the present invention collects steel chips efficiently, and the dust collecting box prevents the chips from being raised again, so that the dust volume in the workshop is maintained at a low level, which not only protects the health of the operators, but also prevents the dust from eroding and interfering with other precision equipment, thereby ensuring a stable and orderly production environment in the workshop.

[0019] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a drawing process step diagram of the present invention; Figure 2 It is a schematic diagram of the overall structure of the present invention; Figure 3 It is a side view of the overall structure of the present invention; Figure 4 It is a cross-sectional view of the main structure of the present invention; Figure 5 A cross-sectional view of a chip removal unit of the present invention; Figure 6 is a side cross-sectional view of a chip removal unit of the present invention; Figure 7 is a side cross-sectional view of a stretching unit of the present invention; Figure 8 It is a side sectional view of the pusher block of the present invention.

[0021] Description of the drawings: 1. Main body; 101. Discharge port; 102. Conveyor belt; 103. Electric telescopic rod; 2. Loading unit; 201. Bin; 202. Pushing port; 203. Pushing trough; 204. Pushing screw rod; 205. Pushing motor; 206. Pushing block; 207. Arc block; 208. First spring; 3. Transport unit; 301. Slide; 302. Transport screw rod; 303. Transport motor; 304. Clamping claw; 305. Clamping telescopic rod; 306. Connecting rod; 4. Stretching unit; 401. Upper mold; 402. Lower mold; 5. Chip removal unit; 501. Electrostatic generating unit; 502. Shell; 503. Adsorption roller; 504. Scraping plate; 505. Gear ring; 506. Dust collection box; 507. Arc Rubber block; 6. Driving unit; 601. Driving motor; 602. Driving gear; 603. Chain; 604. Driven gear; 605. Rotating shaft; 606. Transmission gear; 7. Electromagnetic adsorption unit; 701. Electromagnetic coil; 702. Magnetic metal plate; 703. Base; 8. Mechanical locking unit; 801. Lock pin; 802. Lock hole; 9. Return unit; 901. Material receiving plate; 902. Second spring. DETAILED DESCRIPTION

[0022] To facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings, but the present invention can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the content disclosed in the present invention more thorough and comprehensive. Example

[0023] Please refer to the attached Figure 1 As shown, a battery steel shell stretching process includes the following steps: SP1, plate loading, the plate used for stretching is placed into the loading unit 2, and the loading unit 2 transports the plate to the transport unit 3 in turn; SP2, steel shell stretching, the transport unit 3 transports the plate into the main body 3 for stretching through the stretching unit 4, and at the same time transports the stretched steel shell to the discharge port 101; SP3, separation of steel chips, the conveyor belt 102 at the discharge port 101 transports the steel shell to the chip removal unit 5, and separates the steel shell and steel chips by the principle of electrostatic adsorption; SP4. Collect steel chips. The chip removal unit 5 that is full of steel chips uses mechanical scraping to separate the chips and drop them into the dust collection box 506 below.

[0024] Please refer to the attached Figure 2 , 3 As shown in Figures 5 and 6, the chip removal unit 5 mentioned in the above SP3 is connected to the main body 1 through a conveyor belt 102, and the chip removal unit 5 includes an electrostatic generating unit 501 and a shell 502, the electrostatic generating unit 501 is arranged on the side wall of the discharge port 101, an adsorption roller 503 is arranged in the shell 502, a scraper plate 504 is arranged inside the adsorption roller 503, and a gear ring 505 is arranged outside the adsorption roller 503, the gear ring 505 is meshingly connected to the driving unit 6, a dust box 506 is also arranged in the shell 502, and the dust box 506 is located directly below the adsorption roller 503.

[0025] It should be noted that the electrostatic generating unit 501 uses a small, high-frequency electrostatic generator that can accurately control the output voltage and current. After the steel shell is stretched and output from the discharge port 101, the static electricity is immediately released to the surrounding space, so that the steel shell and the debris particles are quickly charged with different polarities. Since the debris has a small mass and a relatively large surface area, it will absorb more charges and is easier to separate later. The adsorption roller 503 is made of silica gel material, and a conductive coating is provided on the inner surface of the adsorption roller 503 to ensure that the electric field on the surface of the adsorption roller 503 is evenly distributed and the debris is stably adsorbed. The adsorption roller 503 is connected to an external power supply to maintain a weak charge of a specific polarity, which is opposite to the charge carried by the steel shell. When the charged steel shell and debris pass through the adsorption roller 503, the debris is tightly adsorbed on the surface of the adsorption roller 503 by electrostatic attraction, while the steel shell, due to its large mass and strong inertia, only briefly contacts the adsorption roller 503 and continues to move along the conveyor belt 102, thereby achieving the separation of the steel shell and the debris.

[0026] It should be noted that the shape of the adsorption roller 503 is a circle with a notch. When the adsorption roller 503 rotates to the notch position aligned with the dust box 506, a channel is provided for the steel chips to fall. The scraper plate 504 is arranged at the position of the adsorption roller 503 corresponding to the dust box 506, and the contact surface between the scraper plate 504 and the adsorption roller 503 is provided with an arc-shaped rubber block 507. As the adsorption roller 503 continues to rotate, the arc-shaped rubber block 507 of the scraper plate 504 can fully contact the inner wall of the adsorption roller 503. Since the steel chips are attached to the inner wall of the adsorption roller 503 by electrostatic adsorption, the scraper plate 504 will apply mechanical force during operation to destroy the adsorption state between the steel chips and the inner wall of the adsorption roller 503, so that the steel chips are loosened. Once the steel chips are loosened, they will fall into the dust box 506 below along the gap of the adsorption roller 503 under the action of the centrifugal force generated by the rotation of the adsorption roller 503 and their own gravity. The dust box 506 has a filter inside to prevent the debris from being lifted up again, and can also be regularly drawn out for cleaning, thereby achieving the purpose of cleaning the adsorption roller 503 and collecting steel chips.

[0027] It should be noted that the driving unit 6 includes a driving motor 601, the output end of the driving motor 601 is connected to a driving gear 602, the driving gear 602 is connected to a driven gear 604 through a chain 603, the driven gear 604 is connected to a transmission gear 606 through a rotating shaft 605, and the transmission gear 606 is meshed and connected to the ring gear 505. When the driving motor 601 is turned on, the driving gear 602 also rotates, thereby driving the driven gear 604 to rotate through the chain 603, and the rotation of the driven gear 604 is transmitted to the transmission gear 606 through the rotating shaft 605. The transmission gear 606 rotates synchronously, and the transmission gear 606 and the ring gear 505 on the outer wall of the adsorption roller 503 are meshed and transmitted with each other, thereby driving the adsorption roller 503 to rotate.

[0028] Please refer to the attached Figure 2 , 3 , 4, 7, as shown, the stretching unit 4 mentioned in the above SP2 includes an upper mold 401 and a lower mold 402, and the upper mold 401 and the lower mold 402 are detachably connected to the main body 1 through a connecting component, and the number and position of the upper mold 401 and the lower mold 402 correspond. In addition, a return unit 9 is provided in the lower mold 402; the connecting component includes an electromagnetic adsorption unit 7 and a mechanical locking unit 8, and the electromagnetic adsorption unit 7 is composed of an electromagnetic coil 701 and a magnetic metal plate 702, and the electromagnetic coil 701 is installed on a base 703, and the base 703 is arranged at the output end of the electric telescopic rod 103, and the electric telescopic rod 103 is arranged in the top wall of the main body 1, and the magnetic metal plate 702 is installed on the top of the upper mold 401; the mechanical locking unit 8 includes a locking pin 801 and a locking hole 802, and the locking pin 801 is arranged on the side of the base 703, and the locking hole 802 is arranged on the top side of the upper mold 401.

[0029] It should be noted that when the upper mold 401 and the lower mold 402 need to be installed, the electromagnetic coil 701 is energized first, and the magnetic metal plate 702 is adsorbed by electromagnetic attraction, and the upper mold 401 is quickly pulled to the preset position of the base 703 for preliminary positioning. The suction force can be adjusted as needed, generally controlled at 500-1500N, which is enough to overcome the self-weight and slight installation deviation of the upper mold 401. Subsequently, the locking pin 801 is inserted into the corresponding locking hole 802. The head of the locking pin 801 adopts a conical design to facilitate accurate insertion. After insertion, the locking pin 801 is rotated at a certain angle to achieve mechanical self-locking and provide stable support for the mold.

[0030] It should be noted that the return unit 9 includes a receiving plate 901, which is located in the lower mold 402, and the bottom of the receiving plate 901 is connected to one end of a second spring 902, and the other end of the second spring 902 is connected to the inner bottom wall of the lower mold 402. After the steel shell is stretched and formed, the upper mold 401 is lifted, and the second spring 902 in a compressed state begins to release elastic potential energy, pushing the receiving plate 901 to move upward. The receiving plate 901 will then eject the steel shell or waste generated by stretching from the lower mold 402. The entire process does not require the intervention of an additional complex power mechanism, and realizes automated operation, greatly improving the production rhythm, reducing the time loss of manual mold cleaning, and allowing the stretching process to be carried out continuously and efficiently.

[0031] Please pay special attention to the figures 2, 3, 4 and 8. The loading unit 2 mentioned in the above SP1 includes a silo 201, a pushing port 202 is provided at the bottom of the silo 201, and a pushing groove 203 is provided at the bottom of the silo 201, a pushing screw 204 is provided in the pushing groove 203, one end of the pushing screw 204 is transmission-connected to a pushing motor 205, and the other end is rotationally connected to the main body 1, and a matching pushing block 206 is sleeved on the pushing screw 204; the pushing block 206 is a hollow rectangular block with an opening at the top, and an arc block 207 is provided in the pushing block 206, and one end of a first spring 208 is connected to the bottom of the arc block 207, and the other end of the first spring 208 is connected to the inner bottom wall of the pushing block 206.

[0032] It should be noted that the steel plate material to be stretched is placed inside the silo 201. At this time, the steel plate material will fall to the bottom of the silo 201 under the action of gravity, and the pushing motor 205 is started, so that the output end of the pushing motor 205 drives the pushing screw 204 to rotate. Since the pushing screw 204 and the pushing block 206 are matched, the pushing screw 204 drives the pushing block 206 to slide in the pushing groove 203 toward the conveying unit 3, so that the vertical surface of the arc block 207 of the pushing block 206 moves the steel plate material at the bottom, and then The feeding operation is performed. After the feeding is completed, the pushing motor 205 rotates in the reverse direction, so that the pushing screw 204 drives the pushing block 206 to slide in the reverse direction in the pushing groove 203. At this time, the arc surface of the arc block 207 will be squeezed by the steel plate material, so that the arc block 207 squeezes the first spring 208 and makes the first spring 208 in a compressed state. When the arc block 207 moves to the far right, the steel plate material cannot squeeze the arc block 207 at this time. The arc block 207 will reset under the reaction of the first spring 208, and then prepare for the next feeding.

[0033] It should be noted that the stretching unit 4 is divided into two stations, namely the primary stretching station and the secondary stretching station, which divides the stretching forming of the battery steel shell into two steps, making the metal fiber flow inside the plate more reasonable and uniform, reducing the internal defects caused by rapid deformation, and greatly improving the strength and toughness of the steel shell. Moreover, after two step-by-step stretching, it can better meet the needs of complex-shaped steel shell forming and meet the diverse requirements of different battery models for the appearance and size of the steel shell.

[0034] Please refer to the attached Figure 2 , 3 As shown in Figure 4, the transport unit 3 mentioned in the above SP2 includes a pair of parallel slide grooves 301, each of which is provided with a transport screw rod 302, one end of the transport screw rod 302 is connected to a transport motor 303, and the other end is rotatably connected to the inner wall of the slide groove 301 away from the transport motor 303, and three pairs of matching clamps 304 are sleeved on the transport screw rod 302, and the three pairs of clamps 304 are provided with a clamping telescopic rod 305, and the three clamps 304 are interconnected by a connecting rod 306.

[0035] It should be noted that, in the face of plates of different shapes and thicknesses, the clamping jaws 304 can use the clamping telescopic rod 305 to fine-tune the clamping force to ensure a stable grasp and prevent the plates from slipping or shifting during transportation. The connecting rod 306 enables the three pairs of clamps 304 to act in coordination, so that the movement of the workpieces at the three stations of primary stretching, secondary stretching, and unloading is carried out synchronously, maintaining the continuity of material transportation.

[0036] The specific operation process of the present invention is as follows: First, the cold-rolled sheet used for stretching is placed in the loading unit 2, and the pushing motor 205 is started to drive the pushing screw 204 to rotate, so that the pushing screw 204 drives the pushing block 206 to slide in the pushing groove 203 toward the conveying unit 3, and the vertical surface of the arc block 207 of the pushing block 206 moves the steel sheet material at the bottom, and then the feeding operation is performed to convey the sheet to the conveying unit 3; Then the first pair of clamps 304 of the transport unit 3 clamps the plate, while the second and third pairs of clamps 304 clamp the battery steel shells on the primary and secondary stretching stations of the stretching unit 4, and move synchronously toward the discharge port 101, so that the plate enters the primary stretching station, and the steel shell after the primary stretching enters the secondary stretching station, and the steel shell at the secondary stretching station falls onto the conveyor belt 102 and enters the subsequent chip removal unit 5; Then, the formed battery steel shell jumps over the conveyor belt 102 and passes through the electrostatic generating unit 501 on the discharge port 101, so that the steel shell and the debris particles are quickly charged with different polarities. When passing through the conveyor belt 102 and passing through the adsorption roller 503, the debris is tightly adsorbed on the surface of the adsorption roller 503 by the electrostatic attraction, while the steel shell, due to its large mass and strong inertia, only briefly contacts the adsorption roller 503 and then continues to move along the conveyor belt 102 to enter the subsequent process; Finally, during the rotation process, the steel chips adsorbed on the inner surface of the adsorption roller 503 are mechanically scraped by the scraper plate 504 and fall into the dust box 506 below it. The dust box 506 has a filter inside to prevent the chips from being lifted up again, and can also be regularly drawn out for cleaning.

[0037] The above is an exemplary description of the present invention in combination with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as such non-substantial improvements are made by adopting the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A battery steel shell stretching process, characterized in that: The following steps are involved: SP1, plate loading, placing the plate used for stretching into the loading unit (2), and the loading unit (2) sequentially transports the plate to the transport unit (3); SP2, steel shell stretching, the transport unit (3) transports the plate into the main body (3) for stretching through the stretching unit (4), and at the same time transports the stretched steel shell to the discharge port (101); SP3, separating steel chips, the conveyor belt (102) at the discharge port (101) transports the steel shell to the chip removal unit (5), and separates the steel shell and steel chips by the principle of electrostatic adsorption; SP4. Collect steel chips. The chip removal unit (5) that has absorbed the steel chips removes the chips through mechanical scraping, and the chips fall into the dust collection box (506) below.

2. A stretching device for the battery steel shell stretching process according to claim 1, characterized in that: The chip removal unit (5) mentioned in SP3 is connected to the main body (1) via the conveyor belt (102), and the chip removal unit (5) comprises an electrostatic generating unit (501) and a shell (502), wherein the electrostatic generating unit (501) is arranged on the side wall of the discharge port (101), an adsorption roller (503) is arranged in the shell (502), a scraping plate (504) is arranged in the adsorption roller (503), and a gear ring (505) is arranged outside the adsorption roller (503), and the gear ring (505) is meshingly connected to the driving unit (6), and a dust collecting box (506) is also arranged in the shell (502), and the dust collecting box (506) is located directly below the adsorption roller (503).

3. The stretching device for a battery steel shell stretching process according to claim 2, characterized in that: The adsorption roller (503) is made of silica gel material, and a conductive coating is provided on the inner surface of the adsorption roller (503); The scraping plate (504) is arranged at a position of the adsorption roller (503) corresponding to the dust collecting box (506), and a curved rubber block (507) is provided on the contact surface between the scraping plate (504) and the adsorption roller (503).

4. The stretching device for a battery steel shell stretching process according to claim 2, characterized in that: The driving unit (6) comprises a driving motor (601), the output end of the driving motor (601) is connected to a driving gear (602), the driving gear (602) is connected to a driven gear (604) via a chain (603), the driven gear (604) is connected to a transmission gear (606) via a rotating shaft (605), and the transmission gear (606) is meshed and transmission-connected to the ring gear (505).

5. The stretching device for a battery steel shell stretching process according to claim 2, characterized in that: The stretching unit (4) mentioned in SP2 comprises an upper mold (401) and a lower mold (402), wherein the upper mold (401) and the lower mold (402) are detachably connected to the main body (1) via a connecting assembly, and the number and position of the upper mold (401) and the lower mold (402) correspond to each other. In addition, a material return unit (9) is provided in the lower mold (402).

6. The stretching device for a battery steel shell stretching process according to claim 5, characterized in that: The connection assembly comprises an electromagnetic adsorption unit (7) and a mechanical locking unit (8), the electromagnetic adsorption unit (7) comprising an electromagnetic coil (701) and a magnetic conductive metal plate (702), the electromagnetic coil (701) being mounted on a base (703), the base (703) being arranged at the output end of an electric telescopic rod (103), the electric telescopic rod (103) being arranged in the top wall of the main body (1), and the magnetic conductive metal plate (702) being mounted on the top of the upper mold (401); The mechanical locking unit (8) comprises a locking pin (801) and a locking hole (802), wherein the locking pin (801) is arranged on a side surface of the base (703), and the locking hole (802) is arranged on a top side surface of the upper mold (401).

7. The stretching device for a battery steel shell stretching process according to claim 5, characterized in that: The material return unit (9) comprises a material receiving plate (901), the material receiving plate (901) is located in the lower mould (402), and the bottom of the material receiving plate (901) is connected to one end of a second spring (902), and the other end of the second spring (902) is connected to the inner bottom wall of the lower mould (402).

8. The stretching device for a battery steel shell stretching process according to claim 2, characterized in that: The loading unit (2) mentioned in SP1 comprises a silo (201), a pushing port (202) is provided at the bottom of the silo (201), and a pushing groove (203) is provided at the bottom of the silo (201), a pushing screw (204) is provided in the pushing groove (203), one end of the pushing screw (204) is transmission-connected to a pushing motor (205), and the other end is rotationally connected to the main body (1), and a matching pushing block (206) is sleeved on the pushing screw (204).

9. The stretching device for a battery steel shell stretching process according to claim 8, characterized in that: The pusher block (206) is a hollow rectangular block with an opening at the top, and an arc block (207) is provided inside the pusher block (206). The bottom of the arc block (207) is connected to one end of a first spring (208), and the other end of the first spring (208) is connected to the inner bottom wall of the pusher block (206).

10. The stretching device for a battery steel shell stretching process according to claim 2, characterized in that: The transport unit (3) mentioned in SP2 comprises a pair of parallel slide grooves (301), each of the slide grooves (301) being provided with a transport screw (302), one end of the transport screw (302) being connected to a transport motor (303), and the other end being rotatably connected to an inner wall of the slide groove (301) away from the transport motor (303), and three pairs of matching clamping jaws (304) being sleeved on the transport screw (302), each of the three pairs of clamping jaws (304) being provided with a clamping telescopic rod (305), and the three pairs of clamping jaws (304) being interconnected by a connecting rod (306).

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