AA alkaline battery
View Patent ↗A positive electrode and a negative electrode are accommodated in a bottomed cylindrical battery case with a separator interposed therebetween, and an opening part of the battery case is sealed by means of a gasket. A body part of the battery case has a thickness in the range between 0.1 and 0.17 mm. The positive electrode is made of a material obtained by adding graphite to manganese dioxide. The density of the graphite in the material of the positive electrode is in the range between 0.12 and 0.23 g/cm 3 .
1. An AA alkaline battery comprising: a bottomed cylindrical battery case including a body part and an opening part sealed by means of a gasket; and a positive electrode and a negative electrode accommodated in the battery case with a separator interposed therebetween, wherein
the AA alkaline battery has an outer diameter in a range between 14.1 and 14.3 mm,
the body part of the battery case has a thickness in a range between 0.1 and 0.17 mm, and
the positive electrode is made of a material obtained by adding graphite to manganese dioxide, a density of the graphite in the material of the positive electrode being in a range between 0.12 and 0.23 g/cm 3 .
2. The AA alkaline battery of claim 1 , wherein
the density of the graphite is in a range between 0.16 and 0.20 g/cm 3 .
3. The AA alkaline battery of claim 1 , wherein
the thickness of the body part of the battery case is smaller than that of the opening part of the battery case.
4. The AA alkaline battery of claim 3 , wherein
the thickness of the body part of the battery case is 15% or more smaller than that of the opening part of the battery case.
5. The AA alkaline battery of claim 1 , wherein
the body part of the battery case has an outer diameter in a range between 13.95 and 14.15 mm.
6. The AA alkaline battery of claim 1 , wherein
the positive electrode, which is in a hollowed cylindrical shape, and the negative electrode, which is gelled and filled in a hollowed part of the positive electrode, are disposed in the battery case with the separator, which is in a bottomed cylindrical shape, interposed therebetween, and
a ratio (T 1 /T 2 ) of a thickness (T 1 ) in a radial direction of the positive electrode to a thickness (T 2 ) in a radial direction of the negative electrode is in a range between 0.63 and 0.72, and
the AA alkaline battery being capable of high-rate discharge that the number of cycles accumulated until it reaches 1.05 V exceeds 130 where pulse discharge in which a cycle of discharge at 1.5 W for two seconds and discharge at 0.65 W for 28 seconds is repeated is repeated ten cycles per one hour under an environment at a temperature of 20±2° C.
7. The AA alkaline battery of claim 1 , wherein
the positive electrode, which is in a hollowed cylindrical shape, and the negative electrode, which is gelled and filled in a hollowed part of the positive electrode, are disposed in the battery case with the separator, which is in a bottomed cylindrical shape, interposed therebetween, and
a ratio (T 1 /T 2 ) of a thickness (T 1 ) in a radial direction of the positive electrode to a thickness (T 2 ) in a radial direction of the negative electrode is in a range between 0.67 and 0.77, and
the AA alkaline battery being capable of low-rate discharge that a discharge duration accumulated until it reaches 0.9 V exceeds 100 hours where a cycle of discharge for four hours a day with a load of 43Ω applied is repeated everyday under an environment at a temperature of 20±2° C.
8. The AA alkaline battery of claim 6 , wherein
the manganese dioxide has a volume average particle size in a range between 30 and 50 μm and includes 5% or lower particles of which particle size is equal to or smaller than 100 μm.
9. The AA alkaline battery of claim 6 , wherein
the manganese dioxide has a volume average particle size in a range between 30 and 50 μm and includes 8% or lower particles of which particle size is equal to or smaller than 5 μm.
10. The AA alkaline battery of claim 1 , wherein
an electrolyte is filled in the battery case, the electrolyte being made of an aqueous solution containing potassium hydroxide at a concentration in a range between 30 and 36%.
11. The AA alkaline battery of claim 10 , wherein
the electrolyte is made of an aqueous solution of potassium hydroxide at a concentration in a range between 30 and 34%.
12. The AA alkaline battery of claim 10 , wherein
the gasket is made of a material of which main component is polyamide resin.
13. The AA alkaline battery of claim 1 , wherein
the positive electrode, which is in a hollowed cylindrical shape, and the negative electrode, which is gelled and filled in a hollowed part of the positive electrode, are disposed in the battery case with the separator, which is in a bottomed cylindrical shape, interposed therebetween, and
a distance in a radial direction between the positive electrode and the negative electrode is in a range between 0.26 and 0.60 mm.
14. The AA alkaline battery of claim 1 , wherein
the battery case has an outer diameter of which increase after discharge under application of a load of 3.9Ω at a temperature of 20° C. until it reaches 0.9 V is equal to or smaller than 0.05 mm.