发明名称 |
Cylindrical lithium ion secondary battery |
摘要 |
The present disclosure relates to a cylindrical lithium ion secondary battery, which can prevent a cylindrical can from being cracked due to an external shock applied during an assembling process while controlling a rupture pressure of the cylindrical can. The cylindrical lithium ion secondary battery includes a cylindrical can, an electrode assembly accommodated in the cylindrical can with an electrolyte, and a cap assembly sealing the cylindrical can, wherein the cylindrical can has a cylindrical bottom portion and a side portion extending from the bottom portion to the cap assembly, and a safety vent having a thickness gradient is formed on the bottom portion. |
申请公布号 |
US8974931(B2) |
申请公布日期 |
2015.03.10 |
申请号 |
US201313745662 |
申请日期 |
2013.01.18 |
申请人 |
Samsung SDI Co., Ltd. |
发明人 |
Kim Daekyu |
分类号 |
H01M2/12;H01M2/02;H01M10/0525 |
主分类号 |
H01M2/12 |
代理机构 |
Knobbe Martens Olson & Bear LLP |
代理人 |
Knobbe Martens Olson & Bear LLP |
主权项 |
1. A cylindrical lithium ion secondary battery comprising:
a cylindrical can; an electrode assembly accommodated in the cylindrical can with an electrolyte; and a cap assembly sealing the cylindrical can, wherein the cylindrical can has a cylindrical bottom portion and a side portion extending from the bottom portion to the cap assembly, and a safety vent having a thickness gradient is formed on the bottom portion, wherein the cylindrical bottom portion of the cylindrical can includes a first surface directed toward the electrode assembly, a second surface opposite to the first surface and being planar, and the safety vent is formed on the second surface, wherein the safety vent further includes a third surface disposed between the first surface and the second surface and a pair of spaced-apart fourth surfaces connecting the third surface and the second surface, and wherein the safety vent includes a first region having a thickness between the first surface and the third surface being 10% to 20% of a thickness between the first surface and the second surface, and a second region having a thickness between the first surface and the third surface being 30% to 40% of a thickness between the first surface and the second surface and the third surface between the first region and the second region has a gradient with respect to the first surface. |
地址 |
Yongin-si KR |