Case for a secondary battery and manufacturing method thereof
A case for a secondary battery and a manufacturing method thereof, the case including a body formed of a conductive material, the body accommodating an electrode assembly; and a crystal barrier type oxide film on a surface of the body.
1 . A case for a secondary battery, the case comprising:
a body formed of a conductive material, the body accommodating an electrode assembly; and
a crystal barrier type oxide film on a surface of the body.
2 . The case as claimed in claim 1 , wherein:
the body is an aluminum plate including aluminum or an aluminum alloy, and
the crystal barrier type oxide film is a crystal barrier type oxide-aluminum membrane.
3 . The case as claimed in claim 1 , wherein:
the body is an aluminum plate including aluminum or an aluminum alloy, and
the crystal barrier type oxide film is a crystal barrier type oxide-aluminum membrane which is formed by an amorphous oxide-aluminum membrane on the aluminum plate that has been subjected to a thermal treatment.
4 . The case as claimed in claim 3 , wherein, in the thermal treatment, a heating temperature is about 300° C. to about 600° C., and a heating time is about one hour to about twenty four hours.
5 . The case as claimed in claim 3 , wherein the amorphous oxide-aluminum membrane is formed on a surface of the aluminum plate through an electro-chemical treatment while the aluminum plate is treated with an adipic acid solution.
6 . The case as claimed in claim 5 , wherein, in the electro-chemical treatment in the adipic acid solution,
a concentration of the adipic acid solution is about 0.5 M to about 1.5 M,
a processing temperature is about 60° C. to about 80° C., and
a processing voltage is about 100 V to about 150 V.
7 . The case as claimed in claim 5 , wherein a thickness of the amorphous oxide-aluminum membrane is increased by an electro-chemical treatment in a boric acid solution for securing further insulating properties of the aluminum plate.
8 . The case as claimed in claim 7 , wherein, in the electro-chemical treatment in the boric acid solution,
a concentration of the boric acid solution is about 0.5 M to about 2.0 M,
a processing temperature is about 60° C. to about 80° C., and
a processing voltage is about 250 V to about 500 V.
9 . A high-capacity or high-power battery including the case as claimed in claim 1 .
10 . A battery for a hybrid electric car or a case of a battery for an electric car including the case as claimed in claim 1 .
11 . A method of manufacturing a case for a secondary battery, the method comprising:
treating an aluminum plate with an adipic acid solution;
forming an amorphous oxide-aluminum membrane on a surface of the aluminum plate through an electro-chemical treatment while the aluminum plate is treated with the adipic acid solution; and
forming a crystal barrier type oxide-aluminum membrane by thermally treating the amorphous oxide-aluminum membrane.
12 . The method as claimed in claim 11 , wherein thermally treating the amorphous oxide-aluminum membrane includes applying a heating temperature of about 300° C. to about 600° C. and a heating time of about one hour to about twenty four hours.
13 . The method as claimed in claim 11 , wherein in the electro-chemical treatment in the adipic acid solution, a concentration of the adipic acid solution is about 0.5 M to about 1.5 M, a processing temperature is about 60° C. to about 80° C., and a processing voltage is about 100 V to about 150 V.
14 . The method as claimed in claim 11 , wherein, between the forming the amorphous oxide-aluminum membrane and the forming the crystal barrier type oxide-aluminum membrane, the method further comprises:
treating the aluminum plate having the amorphous oxide-aluminum membrane thereon with a boric acid solution; and
increasing a thickness of the amorphous oxide-aluminum membrane through an electro-chemical treatment while the aluminum plate is treated with the boric acid solution.
15 . The method as claimed in claim 14 , wherein, in the electro-chemical treatment in the boric acid solution, a concentration of the boric acid solution is about 0.5 M to about 2.0 M, a processing temperature is about 60° C. to about 80° C., and a processing voltage is about 250 V to about 500 V.
16 . The method as claimed in claim 11 , further comprising processing the aluminum plate into a predetermined shape after the forming the crystal barrier type oxide-aluminum membrane.
17 . The method as claimed in claim 11 , further comprising processing the aluminum plate into a predetermined shape prior to treating the aluminum plate with the adipic acid solution.