| 摘要 |
A safety plate of a secondary battery is disclosed, which can prevent the explosion of the battery such as a lithium ion secondary battery which is apt to be exploded due to an excessive inner pressure. In the secondary battery, in which a separator is disposed between a cathode and an anode, a jelly role wound with the separator, the cathode an the anode is received in a battery case connected to the anode with an electrolyte, and an opening of the battery case is sealed by a top cap assembly connected to the cathode, a safety plate is formed of a curved groove on the battery case as a safety element for preventing the explosion of the battery due to the increase of internal pressure, wherein the break occurs almost simultaneously in all parts of the curved groove, reducing the danger of explosion of the secondary battery, the safety of the secondary battery is improved by reducing the break pressure deviation according to the size of the battery case and the position of the groove, and a user is prevented from being injured even after the break of the groove since the groove is formed in a curved shape.
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