Alkaline storage battery having a separator with pores
View Patent ↗An alkaline storage battery comprises: a positive electrode plate; a negative electrode plate; a separator; and an alkaline electrolyte retained by the positive electrode plate, the negative electrode plate, and the separator, wherein the separator has a large number of pores, such that a total volume A of the pores (per unit mass; cm 3 /g) is in the range of 1≦A≦5, and the ratio of the volume B of pores having a diameter of 100 μm or more (per unit mass; cm 3 /g) to the total pore volume A is in the range of 7%≦B/A≦20% (i.e., B/A is between 0.07 and 0.2).
1. An alkaline storage battery, comprising:
a positive electrode plate;
a negative electrode plate;
a separator; and
an alkaline electrolyte retained by the positive electrode plate, the negative electrode plate, and the separator,
wherein the separator has a large number of pores, such that a total volume A of the pores (per unit mass; cm 3 /g) is in the range of 1≦A≦5, and the ratio of a volume B of pores having a diameter of 100 μm or more (per unit mass; cm 3 /g) to the total pore volume A is in the range of 7%≦B/A≦20%.
2. An alkaline storage battery according to claim 1 , wherein the average pore diameter C (μm) of the separator is in the range of 10≦C≦30.
3. An alkaline storage battery according to claim 1 , wherein the separator is made of a hydrophilized polyolefin resin.
4. An alkaline storage battery according to claim 1 , wherein the ratio of the amount D of electrolyte retained by the separator (per unit mass; cm 3 /g) to the total pore volume A of the separator satisfies the relationship of 0.8≦D/A<1.