Connecting pole for a rechargeable battery, rechargeable battery housing and machine for producing a connecting pole

Abstract

The invention relates to a connecting pole (1) for a rechargeable battery (12) having the following features: a) the connecting pole (1) has a connecting section (2), in which a pole terminal can be fastened on the connecting pole (1), b) the connecting pole (1) has a fastening section (3), in which the connecting pole (1) can be fastened in a housing part (5) of the rechargeable battery (12), c) the fastening section (3) has a labyrinth section (4), d) the outer wall (6) of the connecting pole (1) has, in the labyrinth section (4), one or more peripheral projections (7, 8, 10), e) at least two adjacently arranged peripheral projections (70, 71, 72, 73, 80, 81, 82, 83) are flanged in pairs in the mutually facing direction, wherein a recess (11) is formed on each of the peripheral projections (70, 71, 72, 73, 80, 81, 82, 83) with respect to the outer wall (6) of the connecting pole (1) by the flanged region. The invention also relates to a rechargeable battery housing or a part thereof with at least one such connecting pole and to a machine for producing such a connecting pole.

Claims

1. A connecting pole for a rechargeable battery, the connecting pole comprising: a connecting section in which a pole terminal can be attached to the connecting pole, an attachment section in which the connecting pole can be attached in a housing section of a rechargeable battery, labyrinth section, an inner wall wherein the entirety of the inner wall has a smooth surface, and an outer wall comprising one or more peripheral projections in the labyrinth section, wherein at least two adjacently arranged peripheral projections are flanged in pairs in the mutually facing direction, wherein at least one flanged projection forms a hook-shaped profile, wherein flanging only produces one single undercut having a hook-shaped profile per peripheral projection, resulting in an asymmetrical profile of the peripheral projection.

2. The connecting pole according to claim 1, characterized in that the peripheral projections provided with the undercut by flanging are otherwise free of undercuts.

3. The connecting pole according to claim 1, characterized in that at least one non-flanged peripheral projection is respectively arranged above and/or below a pair of flanged peripheral projections.

4. The connecting pole according to claim 1, characterized in that each of the at least two pairs of flanged peripheral projection are adjacently arranged.

5. A rechargeable battery housing or a section thereof comprising at least one connecting pole in accordance with claim 1, wherein the at least one connecting pole with attachment section is embedded in a rechargeable battery housing section by injection molding.

6. A method for manufacturing a connecting pole according to claim 1, comprising: integrally forming on a blank a labyrinth section having one or more peripheral projections in the attachment section on the outer wall of the connecting pole by at least one extrusion press step or molding process.

7. A machine which performs the method of claim 6.

8. A battery having the connecting pole of claim 1.

9. A connecting pole for a rechargeable battery, the connecting pole comprising: a connecting section in which a pole terminal can be attached to the connecting pole, an attachment section in which the connecting pole can be attached to a battery housing, a labyrinth section, an inner wall wherein the entirety of the inner wall has a smooth surface, and one or more peripheral projections provided on an outer wall of the connecting pole in the labyrinth section, wherein at least two adjacently arranged peripheral projections are flanged in pairs in the mutually facing direction, wherein at least one flanged projection forms a hook-shaped profile and the peripheral projection has an asymmetrical profile.

10. A battery having the connecting pole of claim 9.

Description

(1) Shown are

(2) FIG. 1 a sectional view of a connecting pole in the longitudinal direction,

(3) FIG. 2 a sectional view of a further embodiment of a connecting pole in the longitudinal direction,

(4) FIG. 3 a top plan view of embodiments of the connecting pole according to FIGS. 1-2, and

(5) FIG. 4 a sectional view of a rechargeable battery comprising a connecting pole.

(6) In the figures, the same reference numerals are used for elements which correspond to one another.

(7) FIGS. 1 and 2 show respective embodiments of the connecting pole 1, in which the right side of same are depicted with still unflanged peripheral projections; i.e. in the connecting pole's state following molding or extrusion pressing. The same connecting pole 1 is depicted subsequent the flanging process on the respective left side of FIGS. 1 and 2; i.e. with peripheral projections respectively flanged in pairs.

(8) FIG. 1 shows a connecting pole 1 in a longitudinal sectional view. The connecting pole 1 comprises a connecting section 2, an attachment section 3 and a labyrinth section 4. The connecting pole 1 has an outer wall 18 and an upper terminal surface 16 on its exterior in connecting section 2. A peripheral projection 14 which can be of e.g. annular shape is arranged on the exterior of the connecting pole 1 in attachment section 3 adjacent connecting section 2. The peripheral projection 14 can also exhibit the system of teeth still to be described in greater detail below on its outer periphery. An outer wall 6 on the exterior of connecting pole 1 arranged in labyrinth section 4 adjoins the peripheral projection 14. The outer wall 6 is interrupted by peripheral projections 70, 71, 72, 73. Aside from the system of teeth, the connecting pole 1 can be designed for example as a substantially rotationally symmetric component.

(9) As can be seen in FIG. 1, in the intermediate state depicted on the right during manufacture, in which none of the peripheral projections 70, 71, 72, 73 have yet been flanged, the connecting pole 1 comprises a pair of adjacently arranged peripheral projections 71, 72 of asymmetrical profile which are already slightly oriented toward one another. These peripheral projections 71, 72 are then flanged in the nose area with a flanging tool, e.g. with a rolling tool guided around the connecting pole 1, as is shown on the left of FIG. 1. It can be recognized here that the peripheral projections 71, 72 are to be flanged in succession, whereby undercuts are formed in regions 11. The injection molding material can collect in the undercuts 11 when the connecting pole is embedded in the material of the rechargeable battery housing, whereby particularly good sealing is obtained. On the left of the connecting pole 1, FIG. 1 shows exemplary sections of a housing section 5 of the rechargeable battery integrally formed on the connecting pole 1 in an injection molding process. As is recognizable, the exterior of the connecting pole 1 is embedded in the material of the housing section 5 in attachment section 3. The peripheral projections 70, 71, 72, 73 form a labyrinth which provides for good sealing of the rechargeable battery interior relative to the environment.

(10) The connecting pole 1 is of hollow inner design and comprises a cavity 17. The inner cavity 17 serves for the introduction of a pole body, as will be described below in conjunction with FIG. 4.

(11) FIG. 2 shows a further embodiment of a connecting pole 1 in a comparable view to that of FIG. 1 which provides, in contrast to the embodiment of FIG. 1, a first pair of peripheral projections 80, 81 and a second pair of peripheral projections 82, 83 underneath. The pairs 80, 81 and 82, 83 respectively are in each case of comparable design to the peripheral projections 71, 72 according to FIG. 1. As can be seen on the left in FIG. 2, a schematically depicted flanging tool 60, e.g. in the form of a rolling tool, flanges the pairs 80, 81 and 82, 83 respectively of peripheral projections are flanged to mutually face each other, whereby a total of four regions 11 with undercuts are produced.

(12) In all the embodiments, the undercuts 11 of a pair of peripheral projections 70, 71, 72, 73, 80, 81, 82, 83 produced by the flanging face each other; i.e. point toward each other.

(13) In FIGS. 3a), 3b) and 3c), FIG. 3 shows different embodiments of the connecting pole 1 in top plan view, specifically from the terminal surface 16 side. The upper terminal surface 16, outer side wall 18, inner cavity 17 as well as the peripheral projection 14 are recognizable in all three embodiments.

(14) The peripheral projection 14 comprises an external system of teeth, illustrated by teeth 19, 20, 23. The teeth 19, 20, 23 prevent the connecting pole from rotating in the plastic material of the rechargeable battery housing. FIG. 3a) hereby depicts one advantageous embodiment in which the six teeth 19 are in a uniformly distributed arrangement over the periphery of the connecting pole 1. FIG. 3b) depicts one advantageous embodiment with eight teeth 19 in a uniformly distributed arrangement over the periphery of the connecting pole 1.

(15) FIG. 3c) insofar corresponds to the embodiment according to FIG. 3b), whereby teeth 20, 23 having asymmetrical tooth flanks 21, 22 are provided in FIG. 3c) as an advantageous further development. Tooth flank 21 thus has a smaller angle relative to the outer periphery of peripheral projection 14 than tooth flank 22. Tooth 23 is of comparable design to tooth 20 with asymmetrical tooth flanks. Tooth 23 is hereby arranged mirror symmetrically to tooth 20. The tooth flanks 21 of smaller angle provide the opportunity to manufacture the connecting pole using a split mold. The cheeks can thereby be readily separated from the connecting pole upon its removal from the mold since there is no undercut in the direction of separation.

(16) In a method for manufacturing a connecting pole, a labyrinth section having one or more peripheral projections is first formed on a blank in the attachment section on the outer wall of the connecting pole by means of at least one extrusion press step. In a subsequent flanging step directly or indirectly following the extrusion press step, adjacently arranged peripheral projections are flanged toward one another in pairs. The flanging step can advantageously be realized with a peripheral rolling tool 60 rolled around the connecting pole 1. The connecting pole is thereby held in a fixing device. This allows the inventive connecting pole to be manufactured quickly and efficiently.

(17) The cited blank can be of e.g. cylindrical, truncated conical or tubular shape; i.e. already having an inner cavity. Should the blank not yet have an inner cavity, such as the case for example with a solid cylinder or truncated cone, the method comprises at least two extrusion press steps. In a first extrusion press step, a small central cavity in first formed in the blank, for example with a thin borer tool. In a second extrusion press step, the small cavity just produced is then enlarged with a larger borer tool, which hereby concurrently serves centering purposes. The integral forming of the peripheral projections can then ensue at the same time during the second extrusion press step.

(18) The connecting pole 1 can also be alternatively manufactured in a molding process.

(19) FIG. 4 shows a section of a rechargeable battery 12 comprising the battery case 13 and cover part 5 housing components. The cover part 5 is set on top of the battery case 13. Electrode plates forming a plate set 40 are provided in the interior of the battery case 13. The plate set 40 is electrically and mechanically connected to a pole body 42 by means of a connector 41. As can be seen, the pole body 42 is introduced into the inner cavity 17 of the connection socket 1 and projects somewhat at the exterior of the rechargeable battery 12 from the connection socket 1 embedded in cover part 5. The pole body 42 is dimensioned with a somewhat smaller diameter in this area than in the other areas. An annular space is thereby formed between the pole body 42 and the connection socket 1. This annular space serves in electrically and mechanically connecting the pole body 42 and the connection socket 1, e.g. by welding.