Secondary battery
First Claim
1. A secondary battery comprising:
- an electrode assembly having a first electrode tab and a second electrode tab;
a can for containing the electrode assembly therein, the can having a top opening;
a cap assembly including an electrode terminal and a cap plate having a surface insertable within the can for covering the top opening of the can, the surface having a protective device groove; and
a thermo-breaker seated in the protective device groove, and being connected between the first electrode tab and the electrode terminal, the thermo-breaker comprising;
a bimetal having an end connected to the first electrode tab;
a terminal lead wire having a first end connected to the electrode terminal and having a second end in contact with the bimetal; and
a case having a closed space into which the bimetal and the terminal lead wire are mounted, the case comprising a box-type case body with an open top, the box type case body having a bimetal hole adapted to receive the bimetal.
1 Assignment
0 Petitions
Accused Products
Abstract
A secondary battery having an improved electrical connection structure of a secondary protective device by positioning a thermo-breaker in a protective device groove, in order to improve the stability of the secondary battery while minimizing the occupation of the inner space of the can. The secondary battery includes an electrode assembly having positive and negative electrode tabs. A can contains the electrode assembly therein. A cap assembly has an insulated electrode terminal and a cap plate for sealing the top opening of the can. A protective device groove is formed on the bottom surface of the cap plate. A thermo-breaker is seated in the protective device groove while being connected between the first electrode tab and the electrode terminal. When the temperature inside the battery reaches a predetermined value, the bimetal loses contact and the electrical current inside the battery is interrupted, avoiding overcharge/over-discharge or explosion of the battery.
23 Citations
18 Claims
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1. A secondary battery comprising:
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an electrode assembly having a first electrode tab and a second electrode tab; a can for containing the electrode assembly therein, the can having a top opening; a cap assembly including an electrode terminal and a cap plate having a surface insertable within the can for covering the top opening of the can, the surface having a protective device groove; and a thermo-breaker seated in the protective device groove, and being connected between the first electrode tab and the electrode terminal, the thermo-breaker comprising; a bimetal having an end connected to the first electrode tab; a terminal lead wire having a first end connected to the electrode terminal and having a second end in contact with the bimetal; and a case having a closed space into which the bimetal and the terminal lead wire are mounted, the case comprising a box-type case body with an open top, the box type case body having a bimetal hole adapted to receive the bimetal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of providing a secondary protection device of a secondary battery, the secondary battery including an electrode assembly having a first electrode tab and a second electrode tab, a can for containing the electrode assembly therein, the can having a top opening, a cap assembly including an electrode terminal and a cap plate having a surface insertable within the can for covering the top opening of the can, the method comprising:
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locating a protective device groove on the surface of the cap plate; mounting a thermo-breaker in the protective device groove, the thermo-breaker comprising a bimetal, a terminal lead wire having a first end and a second end, and a case having a closed space into which the bimetal and the terminal lead wire are mounted, the case comprising a box-type case body with an open top, the box-type case body having a bimetal hole adapted to recieve the bimetal; and connecting the thermo-breaker between the first electrode tab and the electrode terminal such that an end of the bimetal is connected to the first electrode tab, the first end of the terminal lead wire is connected to the electrode terminal, and the second end of the terminal lead wire contacts the bimetal.
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Specification