Rolling groove machining device for cylindrical secondary battery steel shell

Abstract

The utility model discloses a cylindrical secondary battery steel shell rolling groove machining device which is used for machining a cylindrical secondary battery steel shell and comprises a positioning die, a hobbing cutter, a rotation driving mechanism and a hobbing cutter driving mechanism, the positioning die is used for clamping and positioning the steel shell, and the rotation driving mechanism drives the positioning die to rotate around a first central axis so as to enable the steel shell to rotate automatically; the hobbing cutter comprises a hobbing cutter wheel for machining a rolling groove, positioning wheels formed on the upper side and the lower side of the hobbing cutter wheel and provided with positioning faces at the ends, and a hobbing cutter driving mechanism for driving the hobbing cutter to do telescopic motion relative to the first central axis in the second direction perpendicular to the first central axis, and the wheel diameter of the hobbing cutter wheel is larger than that of the positioning wheels. The section, in the first direction, of the positioning face is a straight line parallel to the steel shell, so that when the hob wheel stretches into the side wall of the steel shell to roll the rolling groove, the positioning wheel abuts against the side wall of the steel shell to prevent the side wall of the steel shell from expanding and deforming, and the first direction is parallel to the first central axis.

Description

Technical Field

[0001] The utility model relates to the field of secondary batteries, in particular to a groove rolling processing device for a cylindrical secondary battery steel shell. Background Art

[0002] With the increasingly serious new energy crisis and the strong guidance of national policies, electric vehicles have become the main trend of future automotive industry development. As an important component of electric vehicles, power batteries have the highest installed capacity in the field of electric vehicles due to their advantages such as small size, high energy density and green environmental protection. At present, lithium-ion / sodium-ion cylindrical batteries have gradually become the mainstream products in the new energy industry due to their high energy density, good capacity consistency, and support for high-rate charging and discharging. More and more manufacturers continue to pursue high-speed production of cylindrical batteries to increase production capacity / market share.

[0003] At present, when cylindrical power batteries are made of steel shells, the outer diameter of the steel shell often expands due to the downward pressure of the upper mold after the steel shell is grooved, which affects the outer diameter size of the finished battery. There is an urgent need for a groove rolling processing device for cylindrical secondary battery steel shells that can solve the above problem. Utility Model Content

[0004] The utility model aims to provide a groove rolling processing device for a cylindrical secondary battery steel shell, which can effectively prevent the side walls of the steel shell above and below the groove from expanding outwards when processing the groove rolling.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a cylindrical secondary battery steel shell rolling groove processing device, which is used for processing the cylindrical secondary battery steel shell, including a positioning mold, a rolling cutter, a rolling cutter driving mechanism and a rotating driving mechanism, wherein the positioning mold is used for clamping and positioning the steel shell; the rotating driving mechanism drives the positioning mold to rotate around the first central axis of the steel shell to make the steel shell rotate; the rolling cutter includes a rolling cutter wheel for processing the rolling groove, and a positioning wheel formed on the upper and lower sides of the rolling cutter wheel and having a positioning surface at the end, the second central axes of the rolling cutter wheel and the positioning wheel are parallel to the first central axis, and The wheel diameter of the hob wheel is larger than the wheel diameter of the positioning wheel, and the cross-section of the positioning surface along the first direction is a straight line parallel to the steel shell, so that when the hob wheel extends into the side wall of the steel shell to roll out a rolling groove, the positioning wheel contacts the side wall of the steel shell to prevent the side wall of the steel shell from expanding and deforming, and the first direction is parallel to the first center axis; the hob drive mechanism drives the hob to extend and retract relative to the first center axis along a second direction perpendicular to the first center axis, so that the hob can press against and extend into the side wall of the steel shell when the steel shell rotates, thereby processing the rolling groove.

[0006] Compared with the prior art, the utility model provides a positioning wheel that contacts and presses the side wall of the steel shell above and below the hob wheel of the hob, and when the hob wheel extends into the side wall of the steel shell to roll out a rolling groove, the positioning wheel contacts the side wall of the steel shell to prevent the side wall of the steel shell from expanding and deforming, wherein the distance between the wheel surface of the hob wheel and the wheel surface of the positioning wheel is the depth of the rolling groove.

[0007] Preferably, the outer wheel surface of the hob wheel gradually becomes smaller to be in a terrace or arc shape, and an R chamfer is provided between the outer peripheral wheel surface of the hob wheel and the side surface of the hob wheel to prevent damage to the side wall of the steel shell during grooving.

[0008] Preferably, the positioning mold includes a bottom mold, an upper mold, and an upper mold lifting drive unit, the bottom mold is installed at the groove rolling position and is provided with a mounting structure for positioning the bottom of the steel shell; the upper mold is installed at the groove rolling position and is arranged opposite to the bottom mold; the upper mold lifting drive unit drives the upper mold to lift and lower, and can make the upper mold press the top of the steel shell from top to bottom, so that the steel shell is pressed and positioned between the bottom mold and the upper mold; the rotating drive mechanism drives the bottom mold and the upper mold to rotate synchronously around the first center axis; the first direction is the vertical direction, the second direction is the horizontal direction, and the bottom mold is located below the upper mold.

[0009] More preferably, the groove rolling processing device further includes a hob lifting drive unit and a positioning sensor for driving the hob lifting action, wherein the positioning sensor detects the upper edge height of the steel shell positioned between the bottom die and the upper die, so that the hob lifting drive unit can adjust the height of the hob according to the upper edge height. This solution enables the utility model to accurately adjust the height of the hob according to the size of the incoming steel shell before the groove rolling, ensuring that the upper shoulder height is constant, and the upper shoulder height is the height from the groove rolling to the upper edge of the steel shell.

[0010] Wherein, the first direction is a vertical direction, the second direction is a horizontal direction, and the bottom mold is located below the upper mold.

[0011] More preferably, the grooving processing device also includes a steel shell conveying mechanism, which includes a first steel shell conveying part, a second steel shell conveying part, a steel shell guide channel, and a first pushing mechanism. The first steel shell conveying part conveys the steel shell from the upper material position to the first intermediate transfer position, the steel shell guide channel connects the first intermediate transfer position and the second intermediate transfer position, the grooving position is located in the middle of the steel shell guide channel, and the first pushing mechanism pushes the steel shell from the first intermediate transfer position to the second intermediate transfer position, so that the steel shell slides along the steel shell guide channel from the first intermediate transfer position to the grooving position, and slides along the grooving position to the second intermediate transfer position, and the second steel shell conveying part conveys the steel shell from the second intermediate transfer position to the lower material position.

[0012] More preferably, the bottom mold includes a base, an elastic member, and a buffer block. The top of the base is provided with a positioning groove corresponding to the bottom of the steel shell. The mounting structure is the positioning groove. The bottom of the positioning groove is provided with a mounting groove. The buffer block is clamped in the mounting groove and can be lifted and lowered between an upper limit and a lower limit. The upper surface of the buffer block is lower than the bottom of the positioning groove at the lower limit, and matches the height of the bottom wall of the steel shell guide channel at the upper limit. The elastic member is installed between the bottom of the mounting groove and the buffer block, and provides an elastic force to lift the buffer block upward, so that the buffer block can rise to the upper limit. The buffer block is a rubber pad or other flexible member with a certain buffering capacity.

[0013] Specifically, the first steel shell conveying part includes a guide channel connecting the upper material position and the first transfer position and a conveyor belt installed on the guide channel, and the conveyor belt drives the steel shell to move along the guide channel from the upper material position to the first transfer position; the second steel shell conveying part includes a linear sliding channel and a second pushing mechanism for the steel shell to slide, and the linear sliding channel connects the second transfer position and the lower material position, and the second pushing mechanism pushes the steel shell along the linear sliding channel from the second transfer position to the lower material position, so that the steel shell slides from the second transfer position along the linear sliding channel to the lower material position.

[0014] Specifically, the first pushing mechanism includes a first pushing block, and an arc-shaped positioning groove matching the steel shell is formed at a corner between one side of the first pushing block facing the loading position and one side of the second intermediate transfer position, and when the first pushing block is located at the first intermediate transfer position, one side of the arc-shaped positioning groove is opposite to the loading position, and the other side is opposite to the rolling groove position, so that when the steel shell moves from the loading position to the first intermediate transfer position, it is positioned on the arc-shaped positioning groove and opposite to the rolling groove position.

[0015] Preferably, the upper mold includes a touch-pressing platform that can cooperate to touch and press the upper edge of the steel shell, a first cylindrical positioning platform that is protruding from the touch-pressing platform and can extend into the steel shell from the opening of the steel shell, and a second cylindrical positioning platform that is protruding from the first cylindrical positioning platform and can extend into the steel shell, the rolling groove and the upper edge of the steel shell have a first height difference, the height of the first cylindrical positioning platform matches the first height difference, the outer diameter of the first cylindrical positioning platform matches the inner diameter of the steel shell to cooperate with the positioning surface to limit the side wall deformation of the steel shell during the rolling groove, the outer diameter of the second cylindrical positioning platform matches the inner diameter of the rolling groove to limit the groove bottom size of the rolling groove when the rolling groove cooperates with the outer wheel surface of the hob wheel, and the height of the second cylindrical positioning platform is greater than or equal to the groove width of the rolling groove in the height direction, so that when the second cylindrical positioning platform extends into the steel shell, the battery cell assembly in the steel shell is pushed down to the lower side of the rolling groove.

[0016] Preferably, the grooving processing device also includes a grooving indicator light, a controller and a display screen, wherein the grooving indicator light is used to indicate the grooving processing status of the steel shell, the controller is respectively connected to the rotary drive mechanism, the hob drive mechanism, the positioning mold and the display screen, and the display screen is used to display the grooving processing process and parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a stereoscopic diagram of the groove rolling processing device of the utility model.

[0018] Figure 2 It is a partial stereoscopic view of the groove rolling processing device of the utility model when the steel shell is not installed.

[0019] Figure 3 It is a partial stereoscopic view of the utility model when the groove rolling processing device is installed on the steel shell.

[0020] Figure 4 It is a cross-sectional view of a steel shell processed by the groove rolling processing device of the utility model.

[0021] Figure 5 It is a partially enlarged cross-sectional view of a steel shell processed by the groove rolling processing device of the utility model.

[0022] Figure 6 It is a structural diagram of the positioning mold of the utility model.

[0023] Figure 7 It is a structural diagram of a hob of the utility model.

[0024] Figure 8 It is a structural diagram of the steel shell conveying mechanism of the utility model. DETAILED DESCRIPTION

[0025] In order to explain the technical content, structural features, achieved objectives and effects of the present invention in detail, the following is a detailed description in conjunction with the implementation modes and the accompanying drawings.

[0026] refer to Figure 1 The utility model discloses a groove rolling processing device 100 for a cylindrical secondary battery steel shell 200, which is used for processing the cylindrical secondary battery steel shell 200, and includes a frame 1, a positioning mold 10, a roller 30, a roller drive mechanism 301 and a rotation drive mechanism 101.

[0027] refer to Figures 2 to 4 The positioning mold 10 is used to clamp and position the steel shell 200, and the rotary drive mechanism 101 drives the positioning mold 10 to rotate around the first central axis of the steel shell 200 to make the steel shell 200 rotate.

[0028] Continue to refer Figure 2 and Figure 3, the positioning mold 10 includes a bottom mold 11, an upper mold 12 and an upper mold lifting drive unit 13. The bottom mold 11 is installed at the groove rolling position 405 and is provided with a mounting structure for mounting the bottom of the steel shell 200. In this embodiment, the mounting structure is a positioning groove 151 that limits the bottom of the steel shell 200 and supports the bottom of the steel shell 200. Of course, the mounting structure is not limited to this, and can also be a positioning gripper or other structure. The upper mold 12 is installed at the groove rolling position 405 and is arranged opposite to the bottom mold 11. The upper mold lifting drive unit 13 drives the upper mold 12 to move up and down, and can make the upper mold 12 press the top of the steel shell 200 from top to bottom, so that the steel shell 200 is pressed and positioned between the bottom mold 11 and the upper mold 12, and the rotating drive mechanism 101 drives the bottom mold 11 and the upper mold 12 to rotate synchronously around the first central axis.

[0029] The first direction is a vertical direction, the second direction is a horizontal direction, and the bottom mold 11 is located below the upper mold 12 .

[0030] Continue to refer Figure 2 and Figure 3 The grooving processing device 100 also includes a hob lifting drive unit 14 and a positioning sensor for driving the hob 30 to lift and lower. The positioning sensor detects the upper edge height of the steel shell 200 positioned between the upper mold 12 and the bottom mold 11, so that the hob lifting drive unit 14 can adjust the height of the hob 30 according to the upper edge height. This solution enables the utility model to accurately adjust the height of the hob 30 according to the incoming material size of the steel shell 200 before the grooving 202, ensuring that the upper shoulder height is constant. The upper shoulder height is the height from the grooving 202 to the upper edge of the steel shell 200.

[0031] refer to Figure 4 and Figure 6The bottom mold 11 includes a base 111, an elastic member 112, and a buffer pad 113. A positioning groove 151 corresponding to the bottom of the steel shell 200 is provided on the top of the base 111, and a mounting groove 152 is provided at the bottom of the positioning groove 151. The buffer pad 113 is clamped in the mounting groove 152 and can be lifted and lowered within a preset stroke. The preset lower limit is lower than the bottom of the positioning groove 151, and the upper limit matches the height of the bottom wall of the steel shell guide channel 43. The elastic member 112 is installed between the bottom of the mounting groove 152 and the buffer pad 113, and provides an upward lifting elastic force to the buffer pad 113, so that the buffer pad 113 can push the bottom of the steel shell 200 to the upper limit when the upper mold 12 rises and separates from the steel shell 200. The slot of the mounting slot 152 extends inward to form a clamping wall 153, and the buffer block 113 is clamped in the mounting slot 152 and is clamped with the clamping wall 153 when the upper limit is reached. The buffer block 113 is a rubber pad or other flexible member with a certain buffering capacity. The base 111 is mounted on the steel shell guide channel 43 through the mounting block 110.

[0032] refer to Figures 4 to 6 The upper mold 12 includes a touch-pressing platform 121 that can cooperate to touch the upper edge of the steel shell 200, a first cylindrical positioning platform 122 that is convexly arranged on the touch-pressing platform 121 and can extend into the steel shell 200 from the opening of the steel shell 200, and a second cylindrical positioning platform 123 that is convexly arranged on the first cylindrical positioning platform 122 and can extend into the steel shell 200. There is a first height difference between the rolling groove 202 and the upper edge of the steel shell 200, and the height of the first cylindrical positioning platform 122 matches the first height difference. The outer diameter of the positioning platform 122 matches the inner diameter of the steel shell 200 to prevent the inner wall of the steel shell 200 from sinking in when the groove 202 is rolled, and the outer diameter of the second cylindrical positioning platform 123 matches the inner diameter of the groove 202 to limit the inner diameter size of the groove 202 when the groove 202 is rolled, and the height of the second cylindrical positioning platform 123 is greater than or equal to the groove width of the groove 202 in the height direction, so that when the second cylindrical positioning platform 123 extends into the steel shell 200, the battery cell assembly 201 in the steel shell 200 is pushed down to the lower side of the groove 202.

[0033] refer to Figure 5 and Figure 7The hob 30 includes a hob wheel 31 for processing the rolling groove 202, and a positioning wheel 32 formed on the upper and lower sides of the hob wheel 31 and having a positioning surface 321 at the end. The second center axes of the hob wheel 31 and the positioning wheel 32 are parallel to the first center axis, and the wheel diameter of the hob wheel 31 is larger than the wheel diameter of the positioning wheel 32. The cross section of the positioning surface 321 along the first direction is a straight line parallel to the steel shell 200, so that when the hob wheel 31 extends into the side wall of the steel shell 200 to roll out the rolling groove 202, the positioning wheel 32 contacts the side wall of the steel shell 200 to prevent the side wall of the steel shell 200 from expanding and deforming. The first direction is parallel to the first center axis. The hob drive mechanism 301 drives the hob 30 to telescope relative to the first center axis along a second direction perpendicular to the first center axis, so that the hob 30 can press and extend into the side wall of the steel shell 200 when the steel shell 200 rotates, thereby processing the rolling groove 202.

[0034] refer to Figure 2 and Figure 3 The hob 30 is rotatably mounted on the mounting frame 302 , the mounting frame 302 is slidably mounted on the frame 1 through a sliding track, and the rotation driving mechanism 101 is fixedly mounted on the frame 1 .

[0035] refer to Figure 5 , the outer wheel surface of the hob wheel 31 gradually becomes smaller to be in an arc shape, and there is an R chamfer between the outer peripheral wheel surface of the hob wheel 31 and the side surface of the hob wheel 31. Of course, the outer wheel surface of the hob wheel 31 can also be gradually deformed to be in a table shape, etc. In this embodiment, R is a chamfer of 0.8 to ensure the size of the groove opening.

[0036] refer to Figure 1 and Figure 8 The grooving processing device 100 also includes a workbench 2 and a steel shell conveying mechanism 4, and the steel shell conveying mechanism 4 is installed on the workbench 2. The steel shell conveying mechanism includes a first steel shell conveying part 41, a second steel shell conveying part 42, a steel shell guide channel 43, and a first pushing mechanism 44. The first steel shell conveying part 41 conveys the steel shell 200 from the upper material position 401 to the first intermediate transfer position 402. The steel shell guide channel 43 connects the first intermediate transfer position 402 and the second intermediate transfer position 403. The rolling groove position 405 is located in the middle of the steel shell guide channel 43. The first pushing mechanism 44 pushes the steel shell 200 from the first intermediate transfer position 402 to the second intermediate transfer position 403, so that the steel shell 200 slides along the steel shell guide channel 43 from the first intermediate transfer position 402 to the rolling groove position 405, and slides along the rolling groove position 405 to the second intermediate transfer position 403. The second steel shell conveying part 42 conveys the steel shell 200 from the second intermediate transfer position 403 to the lower material position 404.

[0037] refer to Figure 1 and Figure 8 The first steel shell conveying part 41 includes a guide channel 411 connecting the loading position 401 and the first transfer position 402 and a conveyor belt 412 installed on the guide channel, and the conveyor belt drives the steel shell 200 to move from the loading position 401 to the first transfer position 402 along the guide channel.

[0038] refer to Figure 1 , Figure 4 and Figure 8 The first pushing mechanism 44 includes a first pushing block 441 and a first telescopic driving part 442. The first telescopic driving part 442 drives the first pushing block 441 to telescope, and the first pushing block 441 pushes the steel shell 200 along the steel shell guide channel 43 to push the steel shell 200 from the first intermediate transfer position 402 to the rolling groove position 405 and the second intermediate transfer position 403 in sequence.

[0039] Among them, at the initial position, the corner between the side of the first push block 441 facing the guide channel 411 and the side facing the rolling groove position 405 is an arc-shaped positioning groove matching the steel shell 200, so as to position the steel shell 200 in two directions, so that when the steel shell 200 moves to the first transfer position 402, it is directly pushed onto the arc-shaped positioning groove of the first push block 441, opposite to the rolling groove position 405.

[0040] refer to Figure 1 and Figure 8 The second steel shell conveying part 42 includes a linear sliding channel 421 for the steel shell 200 to slide and a second pushing mechanism 422. The linear sliding channel 421 connects the second intermediate transfer position 403 and the unloading position 404. The second pushing mechanism 422 pushes the steel shell 200 from the second intermediate transfer position 403 to the unloading position 404 along the linear sliding channel 421, so that the steel shell 200 slides from the second intermediate transfer position 403 along the linear sliding channel 421 to the unloading position 404.

[0041] Among them, the second pushing mechanism 422 includes a second pushing block 423 and a second telescopic driving part 424. The second telescopic driving part 424 drives the second pushing block 423 to telescope, and the second pushing block 423 then pushes the steel shell 200 along the conveying channel 421 to convey the steel shell 200 from the second transfer position 403 to the unloading position 404.

[0042] refer to Figure 1The grooving processing device 100 also includes a grooving indicator light 51, a controller and a display screen 52. The grooving indicator light 51 is used to indicate the grooving 202 processing status of the steel shell 200. The controller is respectively connected to the rotating drive mechanism 101, the hob drive mechanism 301, the positioning mold 10 and the display screen 52. The display screen 52 is used to display the grooving 202 processing process and parameters.

[0043] refer to Figures 1 to 8 , describing the specific working process of the groove rolling processing device 100 of the utility model:

[0044] The loading mechanism places the steel shell 200 loaded with the battery cell assembly 202 vertically with its bottom end facing downward on the loading position 401 in the guide channel 411, and the conveyor belt 412 conveys the steel shell 200 to the first transfer position 402. The loading mechanism then places the next steel shell 200 at the loading position 401, so that the conveyor belt 412 arranges several steel shells 200 in sequence.

[0045] When the steel shell is conveyed to the first transfer position 402, the first pushing mechanism 44 is actuated, so that the first telescopic driving part 442 drives the first pushing block 441 to push the steel shell along the steel shell guide channel 43 to the buffer block 113 at the rolling groove position 405 (the buffer block 113 rises to a position flush or approximately flush with the steel shell guide channel 43 driven by the elastic member 112, so that the steel shell 200 can directly translate along the steel shell guide channel 43 to the buffer block 113).

[0046] The upper mold lifting drive unit 13 drives the upper mold 12 to descend to the height of the upper edge of the steel shell 200 to press the steel shell 200. At this time, the steel shell 200 is clamped between the upper mold 12 and the bottom mold 11 (between the table surface of the touch-pressing platform 121 and the bottom of the positioning groove 151). Under the pressure of the upper mold 12, the steel shell 200 is positioned downward into the positioning groove 151 and is supported on the bottom of the positioning groove 151. The second cylindrical positioning platform 123 and the first cylindrical positioning platform 122 extend into the opening of the steel shell 200, and the second cylindrical positioning platform 123 also presses the battery cell assembly 202 down to below the preset rolling groove position.

[0047] The positioning sensor detects the height of the upper edge of the steel shell 200 , and the roller lift driving unit 14 adjusts the height of the roller 30 according to the height of the upper edge of the steel shell 200 .

[0048] The rotating drive mechanism 101 drives the steel shell 200 to rotate at least one circle, and the hob drive mechanism 301 drives the hob 30 to press forward and extend into the side wall of the steel shell 200, so that the steel shell 200 is deeply formed into a rolling groove 201 by the hob 30 while rotating, wherein the hob wheel 31 extends into the side wall of the steel shell 200 and cooperates with the second cylindrical positioning platform 123 to form the rolling groove 201, and the wheel surface of the positioning wheel 32 presses the side wall of the steel shell 200 and cooperates with the first cylindrical positioning platform 122 to prevent the side wall of the steel shell 200 from expanding or twisting. After the processing of the rolling groove 201 is completed, the hob drive mechanism 301 drives the hob 30 to reset, the upper die lifting drive unit 13 drives the upper die 12 to reset, and the buffer pad 113 is flush with the steel shell guide channel 43 under the action of elastic force.

[0049] The first pushing mechanism 44 is actuated so that the first telescopic driving part 442 drives the first pushing block 441 to push the steel shell 200 processed on the rolling groove position 405 from the rolling groove position 405 to the second transfer position 403, and then drives the first pushing block 441 to return to its original position to prepare to transport the next steel shell 200 from the first transfer position 402 to the rolling groove position 405.

[0050] The second pushing mechanism 422 is in action: the second telescopic driving part 424 drives the second pushing block 423 to telescope, and the second pushing block 423 transports the steel shell 200 from the second transfer position 403 to the unloading position 404 along the conveying channel 421 and then resets.

[0051] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention are still within the scope covered by the present invention.

Claims

1. A cylindrical secondary battery steel shell rolling groove processing device, used for processing cylindrical secondary battery steel shell, characterized in that: include: A positioning die, used for clamping and positioning the steel shell; A rotary drive mechanism drives the positioning die to rotate around the first central axis so as to cause the steel shell to rotate; A hob, comprising a hob wheel for processing a rolling groove, and a positioning wheel formed on the upper and lower sides of the hob wheel and having a positioning surface at the end, the second central axis of the hob wheel and the positioning wheel is parallel to the first central axis, and the wheel diameter of the hob wheel is larger than the wheel diameter of the positioning wheel, and the cross section of the positioning surface along the first direction is a straight line parallel to the steel shell, so that when the hob wheel extends into the side wall of the steel shell to roll out the rolling groove, the positioning surface of the positioning wheel contacts the side wall of the steel shell, and the first direction is parallel to the first central axis; The roller cutter driving mechanism drives the roller cutter to extend and retract relative to the first central axis along a second direction perpendicular to the first central axis.

2. The groove rolling processing device for a cylindrical secondary battery steel shell according to claim 1, characterized in that: The outer wheel surface of the hob wheel gradually becomes smaller to be in a terrace or arc shape, and an R chamfer is provided between the outer peripheral wheel surface of the hob wheel and the side surface of the hob wheel.

3. The groove rolling processing device for cylindrical secondary battery steel shell according to claim 1, characterized in that: The positioning mold comprises: A bottom mold is installed at the groove rolling position and is provided with a mounting structure for positioning the bottom of the steel shell; An upper die is installed at the groove rolling position and is arranged opposite to the bottom die; The upper die lifting driving unit drives the upper die to lift and lower, and can make the upper die press the top of the steel shell from top to bottom, so that the steel shell is pressed and positioned between the bottom die and the upper die; The rotary drive mechanism drives the bottom mold and the upper mold to rotate synchronously around the first central axis; The first direction is a vertical direction, the second direction is a horizontal direction, and the bottom mold is located below the upper mold.

4. The cylindrical secondary battery steel shell groove rolling processing device as claimed in claim 3, characterized in that: It also includes a roller lift drive unit and a positioning sensor for driving the roller lift action. The positioning sensor detects the upper edge height of the steel shell positioned between the bottom mold and the upper mold, so that the roller lift drive unit can adjust the roller height according to the upper edge height.

5. The cylindrical secondary battery steel case groove rolling processing device as claimed in claim 3, characterized in that: It also includes a steel shell conveying mechanism, which includes a first steel shell conveying part, a second steel shell conveying part, a steel shell guide channel, and a first pushing mechanism. The first steel shell conveying part conveys the steel shell from the upper material position to the first intermediate transfer position. The steel shell guide channel connects the first intermediate transfer position and the second intermediate transfer position. The rolling groove position is located in the middle of the steel shell guide channel. The first pushing mechanism pushes the steel shell from the first intermediate transfer position to the second intermediate transfer position, so that the steel shell slides along the steel shell guide channel from the first intermediate transfer position to the rolling groove position, and slides along the rolling groove position to the second intermediate transfer position. The second steel shell conveying part conveys the steel shell from the second intermediate transfer position to the lower material position.

6. The groove rolling processing device for cylindrical secondary battery steel shell according to claim 5, characterized in that: The bottom mold includes a base, an elastic member, and a buffer pad. A positioning groove corresponding to the bottom of the steel shell is provided on the top of the base. The mounting structure is the positioning groove. A mounting groove is provided at the bottom of the positioning groove. The buffer pad is clamped in the mounting groove and can be lifted and lowered between an upper limit and a lower limit. The upper surface of the buffer pad is lower than the bottom of the positioning groove at the lower limit, and matches the height of the bottom wall of the steel shell guide channel at the upper limit. The elastic member is installed between the bottom of the mounting groove and the buffer pad, and provides an upward lifting elastic force to the buffer pad so that the buffer pad can rise to the upper limit.

7. The groove rolling processing device for cylindrical secondary battery steel shell according to claim 5, characterized in that: The first steel shell conveying part includes a guide channel connecting the upper material position and the first transfer position and a conveyor belt installed on the guide channel, and the conveyor belt drives the steel shell to move along the guide channel from the upper material position to the first transfer position; the second steel shell conveying part includes a linear sliding channel and a second pushing mechanism for the steel shell to slide, and the linear sliding channel connects the second transfer position and the lower material position, and the second pushing mechanism pushes the steel shell from the second transfer position to the lower material position along the linear sliding channel, so that the steel shell slides from the second transfer position along the linear sliding channel to the lower material position.

8. The groove rolling processing device for cylindrical secondary battery steel shell according to claim 5, characterized in that: The first pushing mechanism includes a first pushing block, and an arc-shaped positioning groove matching the steel shell is formed at a corner between one side of the first pushing block facing the loading position and one side of the second intermediate transfer position, and when the first pushing block is located at the first intermediate transfer position, one side of the arc-shaped positioning groove is opposite to the loading position, and the other side is opposite to the rolling groove position, so that when the steel shell moves from the loading position to the first intermediate transfer position, it is positioned on the arc-shaped positioning groove and opposite to the rolling groove position.

9. The groove rolling processing device for cylindrical secondary battery steel shell according to claim 3, characterized in that: The upper mold includes a touch-pressing platform that can cooperate to touch and press the upper edge of the steel shell, a first cylindrical positioning platform that is protruding from the touch-pressing platform and can extend into the steel shell from the opening of the steel shell, and a second cylindrical positioning platform that is protruding from the first cylindrical positioning platform and can extend into the steel shell. There is a first height difference between the rolling groove and the upper edge of the steel shell, and the height of the first cylindrical positioning platform matches the first height difference. The outer diameter of the first cylindrical positioning platform matches the inner diameter of the steel shell to cooperate with the positioning surface to limit the side wall deformation of the steel shell during rolling. The outer diameter of the second cylindrical positioning platform matches the inner diameter of the rolling groove to limit the groove bottom size of the rolling groove when the rolling groove cooperates with the outer wheel surface of the hob wheel, and the height of the second cylindrical positioning platform is greater than or equal to the groove width of the rolling groove in the height direction, so that when the second cylindrical positioning platform extends into the steel shell, the battery cell assembly in the steel shell is pushed down to the lower side of the rolling groove.

10. The groove rolling processing device for a cylindrical secondary battery steel shell according to claim 1, characterized in that: It also includes a groove indicator light, a controller and a display screen. The groove indicator light is used to indicate the groove processing status of the steel shell. The controller is respectively connected to the rotation drive mechanism, the hob drive mechanism, the positioning mold and the display screen. The display screen is used to display the groove processing process and parameters.

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