Secondary battery; solar power generation system, wind power generation system, and vehicle provided therewith; and method for fabrication of a secondary battery
A secondary battery with improved life characteristics is provided. The secondary battery (lithium-ion secondary battery) has: an electrode assembly including positive electrodes and negative electrodes; and a package container for housing the electrode assembly along with non-aqueous electrolyte liquid. The package container includes a package can for housing the electrode assembly and a sealing plate sealing the opening of the package can. On the sealing plate, an elevated portion is formed that projects toward the electrode assembly and has, on the side opposite from the electrode assembly, a cavity portion for storing refill non-aqueous electrolyte liquid. The elevated portion has a hole for feeding the refill non-aqueous electrolyte liquid stored in the cavity portion toward the electrode assembly. The hole is sealed with a sealing stopper formed of a resin material letting the refill non-aqueous electrolyte liquid leak toward the electrode assembly.
1. A secondary battery comprising:
a battery portion having a positive electrode, a negative electrode, and a separator and filled with non-aqueous electrolyte liquid;
a non-aqueous electrolyte liquid storage portion in which refill non-aqueous electrolyte liquid is stored;
a package member in which the battery portion and the non-aqueous electrolyte liquid storage portion are housed;
a partition wall disposed inside the package member, between the battery portion and the non-aqueous electrolyte liquid storage portion; and
a seeping portion provided on the partition wall and configured to let the refill non-aqueous electrolyte liquid step out from the non-aqueous electrolyte liquid storage portion into the battery portion; wherein the seeping portion includes:
an opening formed in the partition wall and having an internal thread on the inside thereof; and
an external thread meshing with the internal thread.
2. The secondary battery according to claim 1 , wherein the non-aqueous electrolyte liquid storage portion comprises a tank in which the refill non-aqueous electrolyte liquid is stored.
3. The secondary battery according to claim 1 , wherein the external thread is formed of resin.
4. The secondary battery according to claim 3 , wherein the resin is a resin which deteriorates through exposure to a non-aqueous electrolyte liquid and thereby lets the refill non-aqueous electrolyte liquid seep into the battery portion.
5. The secondary battery according to claim 3 , wherein the resin deteriorates with time whereby, after a lapse of predetermined time, the refill non-aqueous electrolyte liquid seeps out into the battery portion.
6. The secondary battery according to claim 1 , wherein the seeping portion has an O-ring or a seal formed of resin disposed around the external thread.
7. The secondary battery according to claim 1 , wherein the external and internal threads have a gap therebetween so as to let the refill non-aqueous electrolyte liquid seep into the battery portion through the gap.
8. The secondary battery according to claim 1 , wherein the seeping portion comprises a sealing stopper formed by drying-and hardening or ultraviolet-curing a sealing agent.
9. The secondary battery according to claim 1 , wherein the non-aqueous electrolyte liquid storage portion is disposed over the battery portion so that, when the secondary battery is placed for use, the electrolyte liquid in the non-aqueous electrolyte liquid storage portion moves to the battery portion under gravity.
10. An electronic or electric device comprising the secondary battery according to claim 1 as an electric power source.
11. A method for fabrication of a secondary battery, comprising:
including in a package member an electric power storage element having negative and positive electrodes stacked or wound with a separator therebetween;
including inside the package member a partition wall plate comprising an opening;
filling non-aqueous electrolyte liquid through the opening;
sealing the opening with a sealing stopper, joining a lid portion, and filling refill non-aqueous electrolyte liquid through a filling hole in the lid portion or the package member; and
sealing the filling hole in the lid portion or the package member; and
providing a seeping portion on the partition wall plate to let the refill non-aqueous electrolyte liquid seep out from a non-aqueous electrolyte liquid storage portion into a battery portion by configuring the opening formed in the partition wall plate to have an internal thread on the inside thereof and by providing on the sealing stopper an external thread meshing with the internal thread.
12. The method of claim 11 , further comprising forming the sealing stopper with a resin that deteriorates with time whereby, after a lapse of predetermined time, the refill non-aqueous electrolyte liquid seeps out into the battery portion.