High Voltage Battery For Vehicle

Abstract

A high voltage battery for vehicles is provided and includes an electrode tab that is divided into a first part disposed substantially adjacent to a battery cell and a second part disposed substantially adjacent to a terminal. A first part extension extends from the first part and is fixed to a lower pouch and a second part extension extends from the second part and is fixed to an upper pouch. A conductive polymer layer bonds the first part extension and the second part extension to each other and conducts electricity between the first part extension and the second part extension.

Description

technical field [0001] The present invention generally relates to improving the safety of pouch cells using a pouch type circuit interrupt device (CID) thereby improving the marketability of batteries for vehicles ) for high-voltage batteries (high-voltage batteries) for vehicles. Background technique [0002] In recent years, as applications of pouch-type lithium-ion secondary batteries have increased, the energy density of batteries and the energy storage capacity of unit cells have gradually increased. In particular, in order to meet the demands arising from the increase in mileage of vehicles, research has been actively conducted in recent years to find technologies that can increase the energy storage capacity of lithium ion secondary batteries for vehicles. However, in a conventional pouch type lithium ion secondary battery, the case of the battery has very low physical strength, and the battery is not provided with a battery level safety device (CID, positive tempera...

AI Technical Summary

Problems solved by technology

However, in a conventional pouch-type lithium ion secondary battery, the case of the battery has very low physical strength, and the battery is not provided with battery-level safety devices (CID, positive temperature coefficient switch (PTC), fuse, etc.), and therefore, Maintaining the desired safety of batteries with very high energy storage capacity can be difficult

In particular, when a vehicle battery is overcharged, gas is generated in the battery and the temperature inside the battery increases, thus possibly causing thermal runaway in materials inside the battery and possibly causing a fire

In addition, when the vehicle is driven even if an abnormal reaction occurs in only one unit cell, abnormal voltage may easily be caused in the battery pack, thus reducing the driving safety of the vehicle

Images