POWER STORAGE DEVICE
A power storage device includes a case having a metal lid with an insertion hole, a terminal member inserted through the insertion hole, and a resin member insulating between the case and the terminal member. The lid has a surface facing outside, including a ring-shaped hole-surrounding region around the insertion hole, to which the resin member is airtightly firmly fixed, and an outer region contacting the resin member. A two-region consisting of two, the hole-surrounding region and the outer region, has a two-region length at a two-region length ratio of 3.0 or more, which is the ratio of the maximum two-region length to the minimum two-region length, and a seal length of 1.4 or less, which is the ratio of the maximum seal length to the minimum seal length of the hole-surrounding region.
1 . A power storage device comprising:
a case member made of metal and provided with an insertion hole;
a terminal member inserted through the insertion hole;
an electrode body accommodated in the case member and connected to the terminal member; and
a resin member in contact with each of the case member and the terminal member to insulate between the case member and the terminal member,
wherein the case member includes a surface facing outside and including a region in contact with the resin member, the region including:
a ring-shaped seal region surrounding the insertion hole, to which the resin member is airtightly firmly fixed; and
a contact region located outside the seal region in radial directions of the insertion hole, with which the resin member is in contact,
a two-region consisting of the seal region and the contact region has a two-region length, which is a total length of the seal and contact regions, at a two-region length ratio of 3.0 or more, which is a ratio of a maximum two-region length to a minimum two-region length, and
the seal region has a seal length at a seal length ratio of 1.4 or less, which is a ratio of a maximum seal length to a minimum seal length.
2 . The power storage device according to claim 1 , wherein the seal length ratio of the seal length is 1.2 or less.
3 . The power storage device according to claim 1 , wherein the contact region includes an area having the maximum two-region length, and this area includes a resin injected area made of resin injected in insert-molding.
4 . The power storage device according to claim 2 , wherein the contact region includes an area having the maximum two-region length, and this area includes a resin injected area made of resin injected in insert-molding.
5 . The power storage device according to claim 1 , wherein the seal region is located on the surface facing outside the case member and has been subjected to a surface-roughening treatment.
6 . The power storage device according to claim 2 , wherein the seal region is located on the surface facing outside the case member and has been subjected to a surface-roughening treatment.
7 . The power storage device according to claim 3 , wherein the seal region is located on the surface facing outside the case member and has been subjected to a surface-roughening treatment.
8 . The power storage device according to claim 4 , wherein the seal region is located on the surface facing outside the case member and has been subjected to a surface-roughening treatment.