DISCHARGE DEVICE FOR VEHICLE

• US 20120063044A1
• Filed: 09/12/2011
• Published: 03/15/2012
• Est. Priority Date: 09/15/2010
• Status: Active Grant

• Current Assignee: Toyoda Gosei Company Limited (Toyota Motor Corporation), Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyoda Gosei Company Limited (Toyota Motor Corporation), Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: FUKUYAMA, Takaki, SUZUKI, Shigeyuki, KITANO, Eiji
• Granted Patent: US 8,432,648 B2
• Time in Patent Office: Days
• US Class Current: 361/62
• CPC Class Codes: B60L 3/00 Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption methods or circuit arrangements for monitoring or controlling batteries or fuel cells B60L58/00
• CPC Class Codes: B60L 3/0046 relating to electric energy storage systems, e.g. batteries or capacitors
• CPC Class Codes: B60L 3/04 Cutting off the power supply under fault conditions protective devices and circuit arrangements in general H01H; H02H
• CPC Class Codes: B60L 58/14 Preventing excessive discharging
• CPC Class Codes: B60R 2021/01252 Devices other than bags
• CPC Class Codes: B60R 21/01 Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents electrical circuits for transmission of signals between steering wheel and the vehicle itself B60R16/027; for electrically actuating belt retractor locking means B60R22/343
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

A discharge device for a vehicle includes a discharging circuit that connects a second capacitor and a discharging resistor in parallel through activation of a forced connection device. When a collision of the vehicle is detected, the discharge device forcibly stops electricity supply from the storage battery to the electric circuit including the second capacitor, and activates the forced connection device to forcibly discharge the second capacitor. A pair of connecting terminals of the forced connection device are arranged to be pressed against each other with an insulating member disposed therebetween. The forced connection device includes a gas generator for generating combustion gas directed to the insulating member. When an abnormality is detected, the forced connection device short-circuits the connecting terminals with each other through activation of the gas generator. The second capacitor and the discharge device are provided integrally.

Claims

1. A discharge device for a vehicle, the device being employed in a vehicle that includes an electric circuit having at least one capacitor and a storage battery as an electricity source for the electric circuit, the discharge device comprising:

a forced connection device having a pair of terminals, wherein, when the forced connection device is activated, the pair of terminals are short-circuited with each other;

a discharging resistor that is connected in series with the forced connection device; and

a discharging circuit having a circuit structure that connects the at least one capacitor with the discharging resistor in parallel through activation of the forced connection device,

wherein

when an abnormality related to a collision of the vehicle is detected, the discharge device forcibly stops electricity supply from the storage battery to the electric circuit, and activates the forced connection device to forcibly discharge the at least one capacitor through the discharging circuit,

the forced connection device includes;

an insulating member that is disposed between the pair of terminals with the pair of terminals being pressed against each other; and

a gas generator for generating combustion gas directed to the insulating member,

the forced connection device short-circuits the pair of terminals with each other by removing the insulating member through activation of the gas generator at detection of the abnormality, and

the at least capacitor and the discharging circuit are provided integrally.

2. The discharge device for a vehicle according to claim 1, wherein

the at least one capacitor includes a first bus bar forming a first electrode and a second bus bar forming a second electrode, and

the discharging circuit is connected to the first bus bar and the second bus bar so as to connect the first bus bar and the second bus bar with each other.

3. The discharge device for a vehicle according to claim 1, wherein

the at least one capacitor includes a first bus bar forming a first electrode and a second bus bar forming a second electrode, and

the discharge device further comprises:

a case for accommodating the at least one capacitor;

a first terminal formed integrally with the case, the first bus bar being fixed to the first terminal; and

a second terminal formed integrally with the case, the second bus bar being fixed to the second terminal,

the discharging circuit is connected to the first terminal and the second terminal so as to connect the first terminal and the second terminal with each other.

4. The discharge device for a vehicle according to claim 1, wherein the pair of terminals are formed such that the distance between the pair of terminals increases toward the gas generator.

5. The discharge device for a vehicle according to claim 1, wherein the gas generator is arranged to face the insulating member.

6. The discharge device for a vehicle according to claim 1, wherein the insulating member covers the entire periphery of one of the pair of terminals, thereby insulating the terminals from each other.

7. The discharge device for a vehicle according to claim 1, wherein

the electric circuit includes a converter circuit for increasing the voltage input from the storage battery, and

the at least one capacitor includes at least one of a first capacitor to which input voltage of the converter circuit is applied and a second capacitor to which an output voltage of the converter circuit is applied.

8. The discharge device for a vehicle according to claim 1, wherein the electric circuit an electric motor for driving the vehicle and a drive circuit for driving the electric motor.

9. A vehicle comprising:

an electric circuit having at least one capacitor;

a storage battery as an electricity source for the electric circuit; and

a discharge device for a vehicle,

wherein

the discharge device for a vehicle includes;

a forced connection device having a pair of terminals, wherein, when the forced connection device is activated, the pair of terminals are short-circuited with each other;

a discharging resistor that is connected in series with the forced connection device; and

a discharging circuit having a circuit structure that connects the at least one capacitor with the discharging resistor in parallel through activation of the forced connection device,

when an abnormality related to a collision of the vehicle is detected, the discharge device forcibly stops electricity supply from the storage battery to the electric circuit, and activates the forced connection device to forcibly discharge the at least one capacitor through the discharging circuit,

the forced connection device includes;

an insulating member that is disposed between the pair of terminals with the pair of terminals being pressed against each other; and

a gas generator for generating combustion gas directed to the insulating member,

the forced connection device short-circuits the pair of terminals with each other by removing the insulating member through activation of the gas generator at detection of the abnormality, and

the at least capacitor and the discharging circuit are provided integrally.

10. The vehicle according to claim 9, wherein

the electric circuit includes a converter circuit for increasing the voltage input from the storage battery, and

the at least one capacitor includes at least one of a first capacitor to which input voltage of the converter circuit is applied and a second capacitor to which an output voltage of the converter circuit is applied.

11. The vehicle according to claim 9, wherein the electric circuit an electric motor for driving the vehicle and a drive circuit for driving the electric motor.