CYLINDRICAL LITHIUM-ION BATTERY

摘要

[Problem] To provide a cylindrical lithium-ion battery equipped with a conducting path capable of flowing a large current without reducing the assembly workability of the battery. [Solution] The cylindrical lithium-ion battery has a structure in which an electrode body wound in a spiral shape is housed in a cylindrical battery can having an opening while orienting the winding axis in an upper and lower direction, an insulating plate having a through-hole is disposed on the opening side of the electrode body, and the opening is sealed by a sealing body which is also used as the external output terminal of one electrode plate. In the cylindrical lithium-ion battery, the conducting path between the one electrode plate and the sealing body which is also used as the external output terminal consists of a main conducting path and a bypass conducting path. The main conducting path is formed such that a collector tab connected to the one electrode plate is led through the through-hole of the insulating plate to a space between the upper surface of the insulating plate and the bottom surface of the sealing body and is connected to a connection region on the bottom surface of the sealing body while meandering in the space. The bypass conducting path is formed as a collector tab contacting both the meandering collector tab portion and the bottom surface of the sealing body.