High voltage battery for vehicles

Abstract

A high voltage battery for vehicles includes an electrode tab that is divided into a first part placed near a battery cell, and a second part placed near a terminal. A first part extension extends from the first part and is fixed to a lower pouch. A second part extension extends from the second part, comes into contact with the first part extension, has elasticity, and is fixed at an upper end thereof to an upper pouch. A hook part extends from the first part extension and holds the second part extension by grasping an edge of the second part extension.

Description

technical field [0001] The present invention generally relates to a high-voltage battery for a vehicle that can utilize a pouch-type current interrupt device (CID) to achieve the safety of a pouched battery, thereby improving the marketability of the battery for a vehicle. Background technique [0002] In recent years, with the increasing application of bagged lithium-ion batteries, the energy density of the battery and the energy storage capacity of the unit cell have gradually increased. In particular, in order to meet demands brought about by an increase in vehicle mileage, research has been actively conducted in recent years to improve the energy storage capability of lithium-ion batteries for vehicles. However, the problem with conventional pouched lithium-ion batteries is that the sheath of the battery has a low physical strength, and the battery does not have battery-level safety devices (interrupting device (CID), positive temperature coefficient (PTC), fuse, etc. )...

AI Technical Summary

Problems solved by technology

However, the problem with conventional pouched Li-ion batteries is that the sheath of the battery has low physical strength, and the battery does not have battery-level safety devices (current interrupt device (CID), positive temperature coefficient (PTC), fuses, etc. ), making it difficult to achieve the safety required for batteries with high energy storage capacity

Specifically, when a vehicle battery is overcharged, gas is generated in the battery, and the temperature inside the battery rises, so thermal runaway may occur in materials inside the battery, causing a fire

In addition, during the operation of the vehicle, even if an abnormal battery reaction occurs in only one unit cell, an abnormal voltage can easily be generated in the battery pack, thereby reducing the driving safety of the vehicle

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