Cylindrical lithium battery steel shell rolling groove bottom die, positioning die and rolling groove machining device

Abstract

The utility model discloses a cylindrical lithium battery steel shell rolling groove bottom die which comprises a bottom die body and a positioning groove formed in the bottom die body, the groove bottom of the positioning groove gradually extends downwards in an inclined mode from the edge to the middle so as to form an inclined bottom wall for bearing a cylindrical lithium battery steel shell, and the groove wall of the positioning groove is arranged in the vertical direction. The size of the cross section of the positioning groove is matched with the outer diameter of the cylindrical lithium battery steel shell, and a guide opening for guiding the cylindrical lithium battery steel shell in extends outwards from an inlet of the groove wall of the positioning groove. According to the utility model, when the cylindrical lithium battery is subjected to rolling groove processing, the upper shoulder height and the lower shoulder height of the steel shell of the cylindrical lithium battery are kept consistent, and the size consistency during rolling groove processing is ensured. The utility model further discloses a cylindrical lithium battery steel shell channeling positioning die and a channeling machining device.

Description

Technical Field

[0001] This utility model relates to the field of secondary batteries, and in particular to a grooving processing device for cylindrical secondary battery steel shells. Background Technology

[0002] With the increasing severity of the new energy crisis and strong government policy guidance, electric vehicles have become the main trend in the future development of the automotive industry. As a crucial component of electric vehicles, power batteries account for the largest share of installed capacity in the electric vehicle sector due to their advantages such as small size, high energy density, and environmental friendliness. Currently, lithium-ion / sodium-ion cylindrical batteries are gradually becoming the mainstream product in the new energy industry due to their high energy density, good capacity consistency, and ability to support high-rate charging and discharging. More and more manufacturers are continuously pursuing high-speed production of cylindrical batteries to increase production capacity and market share.

[0003] In the manufacturing process of cylindrical lithium batteries, it is difficult to ensure the consistency of the incoming steel casing material. Furthermore, the large tolerance of the bottom radius (R-angle) and the differences between casings from different manufacturers lead to several problems: a large R-angle results in greater sinking of the steel casing when fitting the tapered mold at 85°, increasing H3 and decreasing H1; conversely, a small R-angle results in less sinking, decreasing H3 and increasing H1. Simultaneously, the tolerance of the bottom outer diameter of the steel casing also affects the sinking height. Existing grooving mold designs cannot guarantee the consistency and stability of the upper and lower shoulder heights of the steel casing grooving, thus affecting the dimensional stability of the subsequent sealing process and posing a risk of leakage.

[0004] Therefore, there is an urgent need for a bottom mold for the steel shell of lithium battery and a positioning mold for the grooving of lithium battery. Utility Model Content

[0005] The purpose of this invention is to provide a bottom mold, a positioning mold, and a grooving processing device for cylindrical lithium battery steel shells, which can ensure that the upper and lower shoulder heights of the cylindrical lithium battery steel shells remain consistent during grooving processing, and ensure dimensional consistency during grooving processing.

[0006] To achieve the above objectives, this utility model provides a bottom mold for grooving a cylindrical lithium battery steel shell, including a bottom mold body and a positioning groove formed on the bottom mold body. The bottom of the positioning groove gradually slopes downward from the edge to the middle to form an inclined bottom wall that supports the cylindrical lithium battery steel shell. The groove wall of the positioning groove is arranged in a vertical direction. The cross-sectional dimensions of the positioning groove match the outer diameter of the cylindrical lithium battery steel shell, and a guide port extends outward from the inlet of the groove wall to guide the cylindrical lithium battery steel shell.

[0007] Preferably, the guide opening is funnel-shaped.

[0008] Preferably, the bottom of the positioning groove is conical.

[0009] Specifically, the angle between the inclined bottom wall and the vertical direction is 82.5 degrees.

[0010] Preferably, the bottom of the positioning groove has a through hole in the middle for the lifting and lowering of the detachment module.

[0011] Preferably, the height of the positioning groove wall is 1-2 mm.

[0012] Specifically, the height of the positioning groove wall is 1.39 mm.

[0013] Preferably, the cross-section of the positioning groove is circular, and there is an inner diameter difference between the outer diameter of the cylindrical lithium battery steel shell and the inner diameter of the positioning groove cross-section, the inner diameter difference being 0.05-0.1 mm.

[0014] This utility model also provides a cylindrical lithium battery steel shell grooving positioning mold, including an upper mold, a bottom mold, and a lifting drive mechanism. The bottom mold is the cylindrical lithium battery steel shell grooving bottom mold as described above. The upper mold and the bottom mold are arranged at intervals relative to each other. The lifting drive mechanism drives the upper mold to lift and lower to clamp and position the cylindrical lithium battery steel shell relative to the bottom mold in the vertical direction.

[0015] This utility model also provides a grooving processing device for cylindrical lithium battery steel shells, including a positioning mold, a rotary drive mechanism, a hob, and a hob drive mechanism. The positioning mold is a cylindrical lithium battery steel shell grooving positioning mold as described above. The rotary drive mechanism drives the positioning mold to rotate around the central axis of the bottom of the positioning groove, so that the cylindrical lithium battery steel shell rotates. The hob is located on the side of the positioning mold and moves in a first direction perpendicular to the central axis under the drive of the hob drive mechanism.

[0016] Compared to existing technologies, the bottom of the positioning groove is an inclined bottom wall that gradually slopes downwards from the edge to the center. This allows the cylindrical lithium battery steel shell to sink completely into the bottom mold. After the upper mold is pressed down, it will not sink, and its height will not change, ensuring that the upper and lower shoulder heights of the cylindrical lithium battery steel shell remain consistent during grooving. The sidewalls are set vertically, and the cross-sectional dimensions of the positioning groove match the outer diameter of the cylindrical lithium battery steel shell. This allows the positioning groove to stably support the cylindrical lithium battery steel shell while preventing it from swaying or shifting laterally during grooving rotation. Stable positioning ensures consistent depth during grooving of the cylindrical lithium battery steel shell, guaranteeing dimensional consistency during grooving. Attached Figure Description

[0017] Figure 1 This is a utility model Structural diagram of the grooving processing device for cylindrical lithium battery steel casing.

[0018] Figure 2 This is a partial structural diagram of the positioning mold of this utility model.

[0019] Figure 3 This is a top view of the bottom mold of this utility model.

[0020] Figure 4 It is along Figure 3 A cross-sectional view taken at an angle along line AA.

[0021] Figure 5 It is along Figure 3 A cross-sectional view taken from another angle along line AA. Detailed Implementation

[0022] To explain in detail the technical content, structural features, objectives and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0023] refer to Figure 1 This utility model discloses a grooving processing device 100 for cylindrical lithium battery steel shells, including a positioning mold 10, a rotary drive mechanism 24, a hobbing cutter 23, and a hobbing cutter drive mechanism 22. The positioning mold 10 includes an upper mold 12 and a bottom mold 11. The rotary drive mechanism 24 drives the upper mold 12 and the bottom mold 11 to rotate synchronously around the central axis of the bottom 311 of the positioning groove 31. The hobbing cutter 23 is located on the side of the positioning mold 10 and moves in a first direction perpendicular to the central axis under the drive of the hobbing cutter drive mechanism 22.

[0024] refer to Figure 1 and Figure 2 The positioning mold 10 includes an upper mold 12, a bottom mold 11, and a lifting drive mechanism 21. The upper mold 12 and the bottom mold 11 are arranged at a distance from each other. The lifting drive mechanism 21 drives the upper mold 12 to lift and lower so as to clamp and position the cylindrical lithium battery steel shell in the vertical direction relative to the bottom mold 11.

[0025] refer to Figures 2 to 5 The bottom mold 11 includes a bottom mold body and a positioning groove 31 formed on the bottom mold body. The bottom 311 of the positioning groove 31 gradually slopes downward from the edge to the middle to form an inclined bottom wall that supports the cylindrical lithium battery steel shell. The groove wall of the positioning groove 31 is arranged in a vertical direction. The cross-sectional dimensions of the positioning groove 31 match the outer diameter of the cylindrical lithium battery steel shell. The inlet of the groove wall of the positioning groove 31 extends outward to a guide port 32 for guiding the cylindrical lithium battery steel shell.

[0026] refer to Figure 2 and Figure 3 The guide port 32 is trumpet-shaped.

[0027] refer to Figures 3 to 5 The bottom 311 of the positioning groove 31 is conical. The angle between the inclined bottom wall and the vertical direction is 82.5 degrees, that is, the taper of the bottom 311 of the positioning groove 31 is 165 degrees.

[0028] The positioning groove 31 has a through hole 33 in the middle of its bottom 311 for the lifting and lowering of the demolding module, so that the bottom mold body is annular. After the grooving process is completed, the demolding module rises from the through hole 33 to push the cylindrical lithium battery steel shell upward to disengage from the positioning groove 31. The demolding module is elastically installed in the through hole and, under the action of elastic force, abuts against the cylindrical lithium battery steel shell upward.

[0029] Preferably, the height of the positioning groove 31 is 1-2 mm. Specifically, the height of the positioning groove 31 is 1.39 mm.

[0030] In this embodiment, the positioning groove 31 has a circular cross-section, and there is an inner diameter difference between the outer diameter of the cylindrical lithium battery steel shell and the inner diameter of the positioning groove 31, which is 0.05-0.1 mm. In this embodiment, the outer diameter of the cylindrical lithium battery steel shell is 18.24 mm, and the inner diameter of the positioning groove 31 is 18.32 mm. The inner diameter of the through hole 33 on the positioning groove 31 is 13.7 mm.

[0031] In this embodiment, the bottom edge of the cylindrical lithium battery steel casing has an R-angle, and the standard for this R-angle is R0.63±0.1.

[0032] refer to Figure 1 and Figure 2 The following describes the specific working process of the grooving processing device 100 of this utility model:

[0033] The cylindrical lithium battery casing containing the battery cells is conveyed downwards to the bottom mold 11 located at the grooving position, and the positioning groove 31 supports and positions the cylindrical lithium battery casing. The upper mold 12 is lowered to the height of the upper edge of the cylindrical lithium battery casing, pressing against it. The cylindrical lithium battery casing is then clamped between the upper mold 12 and the bottom mold 11. Under the pressure of the upper mold 12, the cylindrical lithium battery casing is positioned within the positioning groove 31 and rests on the bottom 311 of the positioning groove. The battery cells in the cylindrical lithium battery casing are pressed down by the upper mold 12 below the preset grooving position. A positioning sensor detects the height of the upper edge of the cylindrical lithium battery casing, and the roller cutter lifting drive 25 adjusts the height of the roller cutter 23 according to the height of the upper edge of the cylindrical lithium battery casing.

[0034] The rotary drive mechanism 24 drives the upper mold 12 to rotate, causing the cylindrical lithium battery steel shell and the bottom mold 11 to rotate at least one revolution. The hobbing drive mechanism 22 drives the hobbing cutter 23 to press forward against the side wall of the cylindrical lithium battery steel shell, so that the cylindrical lithium battery steel shell is penetrated by the hobbing cutter 23 to form a groove while rotating. After the grooving is completed, the hobbing drive mechanism 22 drives the hobbing cutter 23 to reset, the upper mold lifting drive part 21 drives the upper mold 12 to reset, and the ejector module moves upward under the action of elastic force to drive the cylindrical lithium battery steel shell to rise and disengage from the positioning groove 31.

[0035] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the scope of the present utility model application shall still fall within the scope of the present utility model.

Claims

1. A bottom mold for grooving a cylindrical lithium battery steel casing, characterized in that: include: The bottom mold body has a positioning groove formed on it. The bottom of the positioning groove gradually slopes downward from the edge to the middle to form an inclined bottom wall that supports the cylindrical lithium battery steel shell. The groove wall is arranged vertically. The cross-sectional dimensions of the positioning groove match the outer diameter of the cylindrical lithium battery steel shell. The inlet of the positioning groove wall extends outward to a guide port for guiding the cylindrical lithium battery steel shell.

2. The bottom mold for grooving cylindrical lithium battery steel casing as described in claim 1, characterized in that: The guide opening is funnel-shaped.

3. The bottom mold for grooving cylindrical lithium battery steel casing as described in claim 1, characterized in that: The bottom of the positioning groove is conical.

4. The bottom mold for grooving cylindrical lithium battery steel casing as described in claim 3, characterized in that: The angle between the inclined bottom wall and the vertical direction is 82.5 degrees.

5. The bottom mold for grooving cylindrical lithium battery steel casing as described in claim 1, characterized in that: The bottom of the positioning groove has a through hole in the middle for the lifting and lowering of the detachment module.

6. The bottom mold for grooving cylindrical lithium battery steel casing as described in claim 1, characterized in that: The height of the positioning groove wall is 1-2 mm.

7. The bottom mold for grooving cylindrical lithium battery steel casing as described in claim 6, characterized in that: The height of the positioning groove wall is 1.39 mm.

8. The bottom mold for grooving cylindrical lithium battery steel casing as described in claim 1, characterized in that: The positioning groove has a circular cross-section, and there is an inner diameter difference between the outer diameter of the cylindrical lithium battery steel shell and the inner diameter of the positioning groove cross-section, the inner diameter difference being 0.05-0.1mm.

9. A cylindrical lithium battery steel shell grooving positioning mold, characterized in that: It includes an upper mold, a bottom mold, and a lifting drive mechanism. The bottom mold is a cylindrical lithium battery steel shell grooving bottom mold as described in any one of claims 1-8. The upper mold and the bottom mold are arranged at intervals relative to each other. The lifting drive mechanism drives the upper mold to lift and lower to clamp and position the cylindrical lithium battery steel shell relative to the bottom mold in the vertical direction.

10. A grooving processing device for a cylindrical lithium battery steel casing, characterized in that: The device includes a positioning mold, a rotary drive mechanism, a roller cutter, and a roller cutter drive mechanism. The positioning mold is a cylindrical lithium battery steel shell grooving positioning mold as described in claim 9. The rotary drive mechanism drives the positioning mold to rotate around the central axis of the bottom of the positioning groove, so that the cylindrical lithium battery steel shell rotates. The roller cutter is located on the side of the positioning mold and extends and retracts relative to the central axis in a first direction perpendicular to the central axis under the drive of the roller cutter drive mechanism.

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