Hob assembly and rolling device for groove rolling of battery shell

Abstract

The utility model relates to a hobbing cutter assembly and rolling device for battery shell channeling, the hobbing cutter assembly comprises a positioning piece and a hobbing cutter piece which are sequentially connected along the axial direction of the hobbing cutter assembly, the circumferential surface of the positioning piece is used for being attached to the circumferential surface of a battery shell, the hobbing cutter piece is provided with a rolling part, and the rolling part is provided with a rolling groove. And at least part of the rolling part and the positioning piece are mutually staggered along the axial direction so as to be used for forming a groove of the battery shell. In this way, on the first aspect, it can be guaranteed that the depths of the grooves rolled out by the rolling part are consistent, and then the size precision of the grooves is guaranteed; on the second aspect, the positioning piece can correct deformation caused by rolling of the battery shell so as to guarantee circle run-out of the battery shell; and on the third aspect, in the subsequent use process, the hob assembly does not need to be integrally replaced, only the hob piece and the positioning piece need to be replaced according to needs, and therefore the maintenance cost can be reduced. The utility model further discloses a rolling device.

Description

Technical Field

[0001] The utility model relates to the technical field of battery production, in particular to a rolling cutter assembly and a rolling device for rolling grooves of a battery shell. Background Art

[0002] Battery shell grooving is one of the important processes in battery processing. Existing battery grooving equipment generally uses a mold assembly to clamp the battery first, then drives the upper mold and the lower mold to rotate, thereby driving the battery to rotate, and finally, moves the blade of the rotating roller toward the battery and squeezes and stretches the shell, thereby forming a circle of grooves on the outside of the battery shell, so as to use the groove to encapsulate the battery and prevent battery leakage.

[0003] However, in the actual production process, the formed groove has no mechanism to limit the outer diameter of the shell, which will lead to unstable size and poor consistency of the formed groove, which seriously affects the stability of battery quality. Utility Model Content

[0004] The utility model aims to provide a rolling cutter assembly and a rolling device for rolling grooves of a battery shell in view of the problem of unstable size of the grooves of the battery shell in the prior art.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A roller cutter assembly for rolling grooves of a battery shell, comprising a positioning member and a roller cutter member connected in sequence along the axial direction of the roller cutter assembly, wherein the circumferential surface of the positioning member is used to fit the circumferential surface of the battery shell, and the roller cutter member is provided with a rolling portion, at least part of the rolling portion is mutually staggered with the positioning member along the axial direction, so as to form the groove of the battery shell. During specific processing, the positioning member corresponds to the side of the battery shell close to the shell opening, the circumferential surface of the positioning member is used to fit the circumferential surface of the battery shell to achieve positioning of the battery shell, and the part of the rolling portion staggered from the positioning member is used to roll and form the groove of the battery shell. In this way, on the first aspect, it is possible to ensure that the depth of the groove rolled out by the rolling part is consistent, thereby ensuring the dimensional accuracy of the groove; on the second aspect, the positioning member can correct the deformation caused by the rolling of the battery shell to ensure the circular runout of the battery shell. After summarizing practical experience, the diameter of the shell opening position of the battery shell can be controlled within a fluctuation of ±0.1mm, thereby ensuring the appearance performance of the battery shell; on the third aspect, the hob member needs to bear the load during the rolling process, so its service life is short, while the positioning member does not need to be subjected to force, so its service life is long. In this way, in the subsequent use process, there is no need to replace the hob assembly as a whole, and the hob member and the positioning member can be replaced as needed, which can reduce maintenance costs.

[0007] Optionally, the profile of the side rolling edge of the rolling portion is arc-shaped, and the side rolling edge of the rolling portion is used to form the groove side edge of the groove, so that the surface profile of the rolling portion can be smooth to avoid sharp edges such as corners, thereby preventing the rolling portion from squeezing and damaging the battery during the rolling process.

[0008] Optionally, the profile of the side rolling edge of the rolling portion satisfies: R=1±0.02 mm, wherein R is the radius of the side rolling edge, so that the dimensional accuracy of the groove can be ensured.

[0009] Optionally, the contour of the upper rolling edge of the rolling part is a plane, the contour of the lower rolling edge of the rolling part is an inclined surface, the upper rolling edge, the side rolling edge and the lower rolling edge are connected in sequence in the direction away from the positioning member, and the diameter of the lower rolling edge decreases in the direction away from the positioning member. In this way, in the first aspect, the upper rolling edge forming groove can be directed toward the upper groove edge of the battery cover to thereby achieve the limitation of the battery cover, and the lower rolling edge forming groove can be directed toward the lower groove edge of the battery cell to thereby achieve the limitation of the battery cell. In the second aspect, setting the contour of the lower rolling edge of the rolling part as an inclined surface can facilitate demolding after rolling forming, so as to prevent the rolling part from being stuck in the groove of the battery shell, thereby facilitating the separation of the battery shell and the rolling cutter assembly after rolling. The upper groove edge of the groove and the lower groove edge of the groove are arranged relative to each other, and are located on two opposite sides of the side groove edges of the groove.

[0010] Optionally, the lower rolling edge satisfies: α=131°±0.02°, wherein α is the angle between the projection line of the lower rolling edge in the cross section and the central axis of the hob assembly, and the central axis is located in the cross section. In this way, the dimensional accuracy of the groove can be guaranteed.

[0011] Optionally, the side of the rolling cutter away from the positioning member is a first positioning portion, the circumference of the first positioning portion is used to fit the first circumference of the battery shell, and the circumference of the positioning member is used to fit the second circumference of the battery shell, wherein the circumference of the battery shell includes the first circumference and the second circumference, and the groove is located between the first circumference and the second circumference. In this way, the positioning effect when rolling the groove can be improved, and the dimensional accuracy of the rolling groove can be further guaranteed.

[0012] Optionally, the positioning member includes a second positioning portion and a step portion sequentially arranged away from the hob member, the circumference of the second positioning portion is used to fit the circumference of the battery housing, and the circumference of the step portion is used to avoid the battery housing. In this way, the step portion can increase the thickness of the positioning member without affecting the positioning, thereby preventing the positioning member from being deformed during long-term use.

[0013] Optionally, the hob assembly is provided with a positioning hole passing through the positioning piece and the hob piece, and the positioning hole is used to sleeve the hob shaft, thereby ensuring the coaxiality between the positioning piece and the hob piece, thereby ensuring the positioning effect when rolling the groove and improving the dimensional accuracy of the groove.

[0014] Optionally, the positioning hole satisfies: Wherein, D is the diameter of the positioning hole. The hob shaft and the positioning hole are clearance-fitted or transition-fitted to further ensure the coaxiality between the positioning piece and the hob piece.

[0015] A rolling device comprises a driving assembly and the rolling cutter assembly, wherein the driving assembly is connected to the rolling cutter assembly.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0017] The present application discloses a roller cutter assembly for rolling a battery shell, wherein the roller cutter assembly comprises a positioning member and a roller cutter member which are sequentially connected along the axial direction of the roller cutter assembly, wherein the circumferential surface of the positioning member is used to fit the circumferential surface of the battery shell, and the roller cutter member is provided with a rolling portion, wherein at least a portion of the rolling portion is staggered with the positioning member along the axial direction so as to be used for forming a groove of the battery shell.

[0018] During specific processing, the positioning piece corresponds to the side of the battery shell close to the shell opening, and the circumferential surface of the positioning piece is used to fit the circumferential surface of the battery shell to achieve positioning of the battery shell, while the part of the rolling part that is offset from the positioning piece is used to roll and form the groove of the battery shell.

[0019] In this way, on the first aspect, it is possible to ensure that the depth of the groove rolled out by the rolling part is consistent, thereby ensuring the dimensional accuracy of the groove; on the second aspect, the positioning member can correct the deformation caused by the rolling of the battery shell to ensure the circular runout of the battery shell. After summarizing practical experience, the diameter of the shell opening position of the battery shell can be controlled within a fluctuation of ±0.1mm, thereby ensuring the appearance performance of the battery shell; on the third aspect, the hob member needs to bear the load during the rolling process, so its service life is short, while the positioning member does not need to be subjected to force, so its service life is long. In this way, in the subsequent use process, there is no need to replace the hob assembly as a whole, and the hob member and the positioning member can be replaced as needed, which can reduce maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural diagram of a hob assembly of the utility model;

[0021] Figure 2 This utility model Figure 1 A cross-sectional view of

[0022] Figure 3 This utility model Figure 2 Exploded diagram of

[0023] Figure 4 It is a schematic diagram of a battery housing being rolled by a roller cutter assembly of the utility model.

[0024] icon:

[0025] Z-axis,

[0026] 10-Hob assembly,

[0027] 11- Positioning parts,

[0028] 111- second positioning portion, 112- step portion,

[0029] 12-Hob parts,

[0030] 121-Rolling Department,

[0031] 1211-side rolled edge, 1212-upper rolled edge, 1213-lower rolled edge,

[0032] 122- first positioning portion,

[0033] 13-Positioning hole,

[0034] 20-Battery housing,

[0035] 21 - groove, 22 - first peripheral surface, 23 - second peripheral surface. DETAILED DESCRIPTION

[0036] The utility model is described in detail below in conjunction with the accompanying drawings.

[0037] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0038] In the related art, the groove forming process of the battery shell has no mechanism to limit the outer diameter of the shell, which will lead to unstable size and poor consistency of the formed groove, which seriously affects the stability of the quality of the lithium-ion battery. In order to solve such problems, the technical solution of this application is produced. Figure 1 to Figure 4 To elaborate.

[0039] The present application discloses a roller cutter assembly 10 for rolling grooves in a battery housing 20, the roller cutter assembly 10 comprises a positioning member 11 and a roller cutter member 12 which are sequentially connected along the axial direction Z of the roller cutter assembly 10, wherein the roller cutter member 12 is provided with a rolling portion 121, and at least a portion of the rolling portion 121 is staggered with the positioning member 11 along the axial direction Z. Both the positioning member 11 and the roller cutter member 12 can be made of tungsten steel to prevent deformation.

[0040] During specific processing, the positioning piece 11 corresponds to the side of the battery shell 20 close to the shell opening, and the circumferential surface of the positioning piece 11 is used to fit the circumferential surface of the battery shell 20 to achieve positioning of the battery shell 20, while the rolling portion 121 staggered from the positioning piece 11 is used to roll and form the groove 21 of the battery shell 20. In this way, on the first aspect, it is possible to ensure that the depth of the groove 21 rolled out by the rolling portion 121 is consistent, thereby ensuring the dimensional accuracy of the groove 21; on the second aspect, the positioning member 11 can correct the deformation caused by the rolling of the battery shell 20 to ensure the circular runout of the battery shell 20. After summarizing actual experience, the diameter of the shell opening position of the battery shell 20 can be controlled within a fluctuation of ±0.1mm, thereby ensuring the appearance performance of the battery shell 20; on the third aspect, the hob member 12 needs to bear the load during the rolling process, so its service life is short, while the positioning member 11 does not need to be subjected to force, so its service life is long. In this way, in the subsequent use process, there is no need to replace the hob assembly 10 as a whole, and the hob member 12 and the positioning member 11 can be replaced as needed, which can reduce maintenance costs.

[0041] Optionally, the contour of the side rolling edge 1211 of the rolling portion 121 is arc-shaped, and the side rolling edge 1211 of the rolling portion 121 is used to form the groove side edge of the groove 21, so that the surface contour of the rolling portion 121 can be smooth and avoid sharp edges such as corners, thereby preventing the rolling portion 121 from squeezing and damaging the battery during the rolling process.

[0042] Optionally, the profile of the side rolling edge 1211 of the rolling portion 121 satisfies: R=1±0.02mm, such as R=0.98mm, 1mm, 1.02mm, etc., wherein R is the radius of the side rolling edge 1211 , so that the dimensional accuracy of the groove 21 can be ensured.

[0043] Optionally, the contour of the upper rolling edge 1212 of the rolling part 121 is a plane, the contour of the lower rolling edge 1213 of the rolling part 121 is an inclined surface, the upper rolling edge 1212, the side rolling edge 1211 and the lower rolling edge 1213 are sequentially connected in the direction away from the positioning member 11, and the diameter of the lower rolling edge 1213 decreases in the direction away from the positioning member 11. In this way, in the first aspect, the upper rolling edge 1212 can be used to form the groove 21 toward the upper groove edge of the battery cover, thereby achieving the limitation of the battery cover, and the lower rolling edge 1213 can be used to form the groove 21 toward the lower groove edge of the battery cell, thereby achieving the limitation of the battery cell. In the second aspect, setting the contour of the lower rolling edge 1213 of the rolling part 121 as an inclined surface can facilitate demolding after roll forming, so as to prevent the rolling part 121 from being stuck in the groove 21 of the battery shell 20, thereby facilitating the separation of the battery shell 20 and the roller assembly 10 after rolling. The upper groove edge of the groove 21 and the lower groove edge of the groove 21 are arranged opposite to each other and are located at two opposite sides of the side groove edges of the groove 21 .

[0044] Optionally, the lower rolled edge 1213 satisfies: α=131°±0.02°, such as α=130.98°, α=131°, α=131.02°, etc.; wherein α is the angle between the projection line of the lower rolled edge 1213 in the cross section and the center axis of the hob assembly 10, and the center axis is located in the cross section. In this way, the dimensional accuracy of the groove 21 can be guaranteed.

[0045] Optionally, the side of the hob member 12 facing away from the positioning member 11 is a first positioning portion 122, and the circumferential surface of the first positioning portion 122 is used to fit the first circumferential surface 22 of the battery shell 20, and the circumferential surface of the positioning member 11 is used to fit the second circumferential surface 23 of the battery shell 20, wherein the circumferential surface of the battery shell 20 includes the first circumferential surface 22 and the second circumferential surface 23, and the groove 21 is located between the first circumferential surface 22 and the second circumferential surface 23.

[0046] The first circumferential surface 22 is used to correspond to the battery cell in the battery housing 20, and the second circumferential surface 23 is used to correspond to the battery cover plate that covers the housing opening of the battery housing 20. In this way, the positioning effect when rolling the groove 21 can be improved, and the dimensional accuracy of the rolling groove 21 can be further ensured.

[0047] Optionally, the positioning member 11 includes a second positioning portion 111 and a step portion 112 sequentially arranged away from the hob member 12, the circumference of the second positioning portion 111 is used to fit the circumference of the battery housing 20, and the circumference of the step portion 112 is used to avoid the battery housing 20. In this way, the step portion 112 can increase the thickness of the positioning member 11 without affecting the positioning, thereby preventing the positioning member 11 from being deformed during long-term use.

[0048] Optionally, the hob assembly 10 is provided with a positioning hole 13 passing through the positioning piece 11 and the hob piece 12, and the positioning hole 13 is used to sleeve the hob shaft, thereby ensuring the coaxiality between the positioning piece 11 and the hob piece 12, thereby ensuring the positioning effect when rolling the groove 21 and improving the dimensional accuracy of the groove 21.

[0049] Optionally, the positioning hole 13 satisfies: For example, D = 19.99 mm, 20 mm, 20.01 mm, etc., where D is the diameter of the positioning hole 13, and the size of the hob shaft can meet Or 20±0.002, that is, the hob shaft and the positioning hole 13 have a clearance fit or a transition fit, which further ensures the coaxiality between the positioning member 11 and the hob member 12.

[0050] The present application also discloses a rolling device, including a driving assembly and a rolling cutter assembly 10 , wherein the driving assembly and the rolling cutter assembly 10 are connected so that the rolling cutter assembly 10 can roll and form a groove 21 on the surface of a battery housing 20 .

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A rolling cutter assembly (10) for rolling grooves of a battery housing (20), characterized in that: It comprises a positioning member (11) and a hob member (12) which are connected in sequence along the axial direction (Z) of a hob assembly (10), wherein: The circumferential surface of the positioning member (11) is used to fit the circumferential surface of the battery housing (20). The rolling cutter element (12) is provided with a rolling portion (121), and at least a portion of the rolling portion (121) and the positioning element (11) are mutually staggered along the axial direction (Z) so as to be used for forming the groove (21) of the battery housing (20).

2. The hob assembly (10) according to claim 1, characterized in that: The profile of the side rolling edge (1211) of the rolling portion (121) is arc-shaped.

3. The hob assembly (10) according to claim 2, characterized in that: The profile of the side rolling edge (1211) of the rolling portion (121) satisfies: R = 1 ± 0.02 mm; Wherein, R is the radius of the side rolling edge (1211).

4. The hob assembly (10) according to claim 2, characterized in that: The profile of the upper rolling edge (1212) of the rolling portion (121) is a plane. The upper rolled edge (1212), the side rolled edge (1211) and the lower rolled edge (1213) are sequentially connected in a direction away from the positioning member (11), and the diameter of the lower rolled edge (1213) decreases in a direction away from the positioning member (11).

5. The hob assembly (10) according to claim 4, characterized in that: The lower rolled edge (1213) satisfies: α=131°±0.02°； Wherein, α is the angle between the projection line of the lower rolling edge (1213) on the cross section and the central axis of the hob assembly (10), and the central axis is located on the cross section.

6. The hob assembly (10) according to any one of claims 1 to 5, characterized in that: A side of the hob member (12) facing away from the positioning member (11) is a first positioning portion (122). The circumferential surface of the first positioning portion (122) is used to fit the first circumferential surface (22) of the battery housing (20), and the circumferential surface of the positioning member (11) is used to fit the second circumferential surface (23) of the battery housing (20).

7. The hob assembly (10) according to any one of claims 1 to 5, characterized in that: The positioning member (11) comprises a second positioning portion (111) and a step portion (112) which are arranged in sequence away from the hob member (12). The circumferential surface of the second positioning portion (111) is used to fit the circumferential surface of the battery housing (20), and the circumferential surface of the step portion (112) is used to avoid the battery housing (20).

8. The hob assembly (10) according to any one of claims 1 to 5, characterized in that: The hob assembly (10) is provided with a positioning hole (13) penetrating the positioning piece (11) and the hob piece (12).

9. The hob assembly (10) according to claim 8, characterized in that: The positioning hole (13) satisfies: D= mm; Wherein, D is the diameter of the positioning hole (13).

10. A rolling device, comprising a drive assembly, characterized in that: It comprises the roller cutter assembly (10) according to any one of claims 1 to 9, wherein the drive assembly is connected to the roller cutter assembly (10).

Images