ELECTRODE FOIL, WOUND CAPACITOR, METHOD FOR MANUFACTURING ELECTRODE FOIL, AND METHOD FOR MANUFACTURING WOUND CAPACITOR
FIG8 is a graph showing Erichsen test results of Example 1 and Comparative Example 1
The results of the Erichsen test are shown in FIG8. FIG8 is a graph in which the horizontal axis is a punch stroke and the vertical axis is a punch load. The punch stroke is the distance that the punch is pushed in, and the punch load is the load required to achieve each punch stroke. As shown in FIG8, while the electrode foil of Comparative Example 1 was torn before the punch stroke reached 1.1 mm, the electrode foil 1 of Example 1 had a punch stroke beyond 1.1 mm before being torn. That is, in the electrode foil 1 of Example 1, the stretchability is improved by providing the separation parts 4. Further, as shown in FIG8, for the electrode foil of Comparative Example 1, for example, a load of 1.8 N was required to make the punch stroke 0.7 mm, however the electrode foil 1 of Example 1 achieved a punch stroke of 0.7 mm with a load of 1.6 N. That is, in the electrode foil 1 of Example 1, the flexibility is improved by about 11% by providing the separation parts 4. That is, it was confirmed that Example 1 in which the stretchability and the flexibility were improved was less likely to generate cracks at the time of winding and was less likely to expose the unoxidized metal portion, compared with Comparative Example 1.
graph
8
separator
7
foil
1
electrode foil electrode foils
4
separation parts separation part
2
core part
0
is from punch was punch stroke
3
surface enlarged parts surface enlarged part
['1. 1. An electrode foil, which is made of a belt-like foil, comprising: surface enlarged parts that are formed on a surface of the foil and are formed of a plurality of tunnel-shaped pits; a core part which is a part remained when excluding the surface enlarged parts within the foil; a plurality of separation parts that extends discontinuously on the surface enlarged parts, and divides the surface enlarged parts; and a dielectric film formed on surfaces of the surface enlarged parts or on surfaces of the surface enlarged part and the separation parts.']