JP2609103B2 - Manufacturing method of sealed battery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for producing a sealed alkaline electricity in which a metal case and a crimp lower mold are improved.

[Conventional technology]

Conventional sealed batteries, for example, cylindrical batteries, house a power generation element in a bottomed metal case, insert a sealing lid plate via an insulating gasket at the open end of the case, and then receive the bottom of the metal case with a crimp lower mold, The open end of the case was bent inward with a crimp upper mold to seal the case.

[Problems to be solved by the invention]

However, in the case of such a manufacturing method, when the corner radius of the bottom of the metal case is larger than the corner radius of the lower crimp, when the case opening end is bent by the upper crimp,
As shown in FIG. 2, since the downward pressing pressure cannot be received vertically, and it concentrates on the point 11b of the corner R R _C of the metal case 11, the case material moves inward of the case bottom. As shown in FIG. 2, the bottom of the case is deformed by warping, and the height of the metal case 11 is lowered, so that the opening end cannot be bent to a predetermined size, and the sealing performance is reduced.

Also, 'even if _C and the crimp lower die corner radius of the same pressing pressure downward corner radius R' corner radius R of the case bottom 11b but is distributed throughout the _C, Case Material crimp Case bottom 11 along the lower mold
b moved inward, causing the same problem as above.

An object of the present invention is to eliminate the above-mentioned drawbacks and to improve the sealing performance of a sealed battery and reduce the appearance defect of the battery.

[Means for solving the problem]

The present invention relates to a sealed battery in which the opening end of a bottomed metal case containing a power generating element is sealed by caulking, as shown in FIG. 1, a ready-made corner radius R _C of the case bottom before crimping.
And the corner between the vertical plane and the horizontal plane of the crimp lower die
A method for producing a sealed battery having a sealed opening, characterized in that the relationship with R _D is R _C <R _D.

[Action]

As described above, as shown in FIG. 1, the present invention relates to the relationship between the pre-crimped corner radius R _C of the bottom of the metal case and the corner radius R _D between the vertical surface and the horizontal surface of the crimp lower die. and by a R _C <R _D, a press pressure downward when bending the metal casing open end with a crimp top mold, a circular arc central portion of the corner radius R _C, relative crimp lower die Since it can be received in the vertical direction, the deformation of the case bottom caused by the movement of the case material can be prevented, and the open end of the metal case can be bent to a predetermined size, so that a sealed battery with excellent sealing properties can be obtained.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1 (a), reference numeral 1 denotes a metal case which has already been formed into a bottomed cylindrical shape by drawing a metal plate. After the power generation element 4 is housed in the metal case 1, a sealing member containing a cover plate 3 obtained by punching a flat metal plate into an insulating gasket 2 having an L-shaped cross section obtained by injection molding a synthetic resin is used. , An inwardly protruding portion 1a provided on the opening side of the metal case 1.
Place on top.

Then, as shown in FIG. 1 (b), the metal case bottom 1b
Corner radius R _C and crimp lower type Dl corner radius
The relationship between R _D, receives a case bottom portion 1b with a crimp under type Dl which was R _C <R _D, via an insulating gasket 2 by bending inward the metal casing open end at the crimp upper die Du With the cover plate 3 fixed, a sealed alkaline battery as shown in FIG. 1 (c) is manufactured.

〔The invention's effect〕

According to the present invention, the corner radius R _{C at the} bottom of the metal case is
By setting the relationship between the corner radius R _D of the lower crimp type and R _C <R _D , the downward press pressure when bending the open end of the metal case with the upper crimp type reduces the corner R R Since it can be received in the center of the circumference of _{C in} the vertical direction with respect to the crimp lower die Dl, deformation of the case bottom due to movement of the metal case material can be prevented, and the metal case opening end can be bent to a predetermined size. Thus, a sealed battery having excellent sealing properties can be obtained.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view of a sealed battery before sealing according to one embodiment of the manufacturing method of the present invention, FIG. 1B is a cross-sectional view of the crimp type battery according to the embodiment, and FIG. FIG. 2 is a bottom sectional view of the metal case after sealing of the conventional battery. 1,11 …… Metal case, 1b, 11b …… Case bottom R _C , R ′ _C …… Case bottom corner radius Dl …… Crimp lower type R _D …… Crimp lower type corner radius

Claims (1)

(57) [Claims] After inserting a sealing cover plate through an insulating gasket into an opening end of a bottomed metal case in which a power generating element is inserted, the bottom end of the metal case is received by a crimping lower mold, and the case opening end is crimped by an upper crimping mold. In a method of manufacturing a sealed battery which is sealed by caulking, a pre-made corner radius before crimping of a bottom of a metal case is provided.
R _C and, the relationship between the corner radius R _D between the vertical and horizontal planes of the crimp under type, method of manufacturing the sealed battery, characterized in that the R _C <R _D.