Safety apparatus and protection method of secondary battery for electric vehicle using switch

Patent metadata

Field	Value
Publication number	US-9865863-B2
Application number	US-201414506940-A
Country	US
Kind code	B2
Filing date	Oct 6, 2014
Priority date	Nov 7, 2007
Publication date	Jan 9, 2018
Grant date	Jan 9, 2018

Abstract

The present invention relates to a safety apparatus and a protection method of a secondary battery, which can prevent explosion and fire of the secondary battery using a switch or a rupture switch attached on the outside of the secondary battery if a swelling degree of the secondary battery reaches a predetermined value when the secondary battery is swelled due to abnormal usage such as overcharge, short-circuit, reverse-connection and heat-exposure of large-capacity lithium polymer battery.

First claim

The invention claimed is:

1. A rupture switch comprising:
a first holding unit attached to the outside of a secondary battery for use in the electric vehicle and having holding holes provided on one side of a folded metal piece for attaching and holding to the secondary battery for use in the electric vehicle,
a second holding unit having a holding hole provided on one end in another side of the folded metal piece for attaching and holding to the secondary battery for use in the electric vehicle,
a third holding unit having a holding hole equipped on another end in the other side of the folded metal piece for attaching and holding to the secondary battery for use in the electric vehicle,
a destruction unit equipped in a center portion between one side and the other side of the folded metal piece,
and a fifth switch lead and a sixth switch lead attached to the second holding unit and the third holding unit,
wherein the rupture switch is destroyed and controls a relay connecting the secondary battery with a drive motor generating a power of the electric vehicle when the secondary battery undergoes a displacement greater than a prescribed value.

2. The rupture switch according to claim 1 , wherein the destruction unit comprises a first destruction unit and a second destruction unit, which are destroyed if the secondary battery for use in the electric vehicle undergoes a displacement greater than a prescribed value.

3. The rupture switch according to claim 1 , wherein the rupture switch is applied with a flame-resistant insulating material having plasticity on its overall surface in order to prevent diffusion of electric flame generated when the destruction unit is destroyed.

Assignees

• Sk Innovation Co Ltd

Inventors

• Jang Sooyeup
• Oh Jeon Keun

Classifications

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• H01H71/12

  Automatic release mechanisms with or without manual release · CPC title

• B60L3/04

  Cutting off the power supply under fault conditions (protective devices and circuit arrangements in general H01H; H02H) · CPC title

• H01M10/052

  Li-accumulators · CPC title

• B60L50/64

  Constructional details of batteries specially adapted for electric vehicles · CPC title