Protective device for a plug-in electric vehicle, charging plate, high-voltage line and plug-in electric vehicle

• US 10,298,032 B2
• Filed: 07/21/2015
• Issued: 05/21/2019
• Est. Priority Date: 07/29/2014
• Status: Active Grant

• Current Assignee: Dr Ing hc F Porsche AG (Volkswagen AG)
• Original Assignee: Dr Ing hc F Porsche AG (Volkswagen AG)
• Inventors: Keller, Ralf, Neurath, Philipp
• Primary Examiner(s): Zhou, Zixuan
• Application Number:
  US14/804,413
• Publication Number:
  US 20160036253A1
• Time in Patent Office: 1,400 Days
• Field of Search: 320108, 320109, 307104
• CPC Class Codes: B60L 3/0023 Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
• CPC Class Codes: B60L 53/12 Inductive energy transfer
• CPC Class Codes: H02J 2310/48 for electric vehicles [EV] or hybrid vehicles [HEV]
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 7/0029 with safety or protection devices or circuits
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles

Abstract

A protective device (28) is provided for a plug-in electric vehicle having a charging plate (22) and a traction battery (26). The protective device (28) has a diode that includes an anode for connecting the diode to the charging plate (22) and a cathode for connecting the diode to the traction battery (26). A charging plate, a high-voltage line and a plug-in electric vehicle having such a protective device also are provided.

Claims

1. A plug-in electric vehicle comprising:

an electric motor;

a traction battery configured to power the electric motor during a driving operation of the plug-in electric vehicle;

a charging plate including at least a secondary coil of an inductive charging system; and

a diode including an anode connected directly to the charging plate and a cathode connected to the traction battery;

wherein the secondary coil of the charging plate is configured to interact with a stationary primary coil of the inductive charging system when the plug-in electric vehicle is suitably positioned relative to the stationary primary coil;

wherein the inductive charging system is configured to inductively charge the traction battery when the secondary coil interacts with the stationary primary coil; and

wherein the diode enables a current flow from the secondary coil of the charging plate to the traction battery when the plug-in electric vehicle is suitably positioned relative to the stationary primary coil, but prevents a current flow from the traction battery to the charging plate during driving.

2. The plug-in electric vehicle of claim 1, wherein the diode is integrated in the charging plate.

3. The plug-in electric vehicle of claim 1, wherein the charging plate is arranged in front of the electric motor.

4. The plug-in electric vehicle of claim 1, wherein the diode is configured as a protective device for protecting the plug-in electric vehicle in the event of a crash.

5. A high-voltage circuit of a plug-in electric vehicle, the high-voltage circuit comprising:

a traction battery configured to power an electric motor of the plug-in electric vehicle during a driving operation of the plug-in electric vehicle;

a charging plate including at least a secondary coil of an inductive charging system; and

a diode including an anode connected directly to the charging plate and a cathode connected to the traction battery;

wherein the secondary coil of the charging plate is configured to interact with a stationary primary coil of the inductive charging system when the plug-in electric vehicle is suitably positioned relative to the stationary primary coil;

wherein the inductive charging system is configured to inductively charge the traction battery in a charging operation of the plug-in electric vehicle by means of an electrical charging current when the secondary coil interacts with the stationary primary coil; and

wherein the diode enables a current flow from the secondary coil of the charging plate to the traction battery when the plug-in electric vehicle is suitably positioned relative to the stationary primary coil, but prevents a current flow from the traction battery to the charging plate during driving.

6. The high-voltage circuit of claim 5, wherein the diode is integrated in the charging plate.

7. The high-voltage circuit of claim 5, wherein the diode is configured as a protective device for protecting the plug-in electric vehicle in the event of a crash.

8. The high-voltage circuit of claim 5, wherein the charging plate is arranged in front of the electric motor.

9. The high-voltage circuit of claim 5, further comprising a high-voltage line for conducting the electrical charging current from the charging plate to the traction battery.

10. The high-voltage circuit of claim 9, wherein the diode is integrated in the high-voltage line.

11. The high-voltage circuit of claim 5, wherein the charging plate includes power electronics configured to control the charging operation.

12. A protective device of a plug-in electric vehicle, the protective device comprising:

a charging plate including at least a secondary coil of an inductive charging system; and

a diode including an anode connected directly to the charging plate and a cathode connected to a traction battery configured to power an electric motor of the plug-in electric vehicle during a driving operation of the plug-in electric vehicle;

wherein the secondary coil of the charging plate is configured to interact with a stationary primary coil of the inductive charging system when the plug-in electric vehicle is suitably positioned relative to the stationary primary coil;

wherein the inductive charging system is configured to inductively charge the traction battery during a charging operation of the plug-in electric vehicle; and

wherein the diode enables a current flow from the secondary coil of the charging plate to the traction battery when the plug-in electric vehicle is suitably positioned relative to the stationary primary coil, but prevents a current flow from the traction battery to the charging plate during driving.

13. The protective device of claim 12, wherein the diode is integrated in the charging plate.

14. The protective device of claim 12, wherein the diode is configured to protect the plug-in electric vehicle in the event of a crash.

15. The protective device of claim 12, wherein the charging plate is arranged in front of the electric motor.

16. The protective device of claim 12, further comprising a high-voltage line for conducting an electrical charging current from the charging plate to the traction battery.

17. The protective device of claim 16, wherein the diode is integrated in the high-voltage line.

18. The protective device of claim 12, wherein the charging plate includes power electronics configured to control the charging operation of the plug-in electric vehicle.