Electric car charging systems

• US 7,768,229 B2
• Filed: 09/18/2007
• Issued: 08/03/2010
• Est. Priority Date: 09/18/2006
• Status: Active Grant

• Current Assignee: BYD Company Limited
• Original Assignee: BYD Company Limited
• Inventors: Zhang, Jianhua, Guo, Bin, Niu, Kaihua
• Primary Examiner(s): Tso; Edward
• Assistant Examiner(s): DIAO, M BAYE
• Application Number:
  US11/857,429
• Publication Number:
  US 20080067974A1
• Time in Patent Office: 1,050 Days
• Field of Search: 320/103, 320/104, 320/109, 320/111, 320/140, 320/141, 320/145, 307/9.1, 307/10.1, 307/66, 903/906, 903/907, 903/903
• US Class Current: 320/104
• CPC Class Codes: B60L 2210/10 DC to DC converters
• CPC Class Codes: B60L 2210/30 AC to DC converters
• CPC Class Codes: B60L 2210/40 DC to AC converters
• 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 53/14 Conductive energy transfer
• CPC Class Codes: B60L 53/53 Batteries
• CPC Class Codes: B60L 53/63 in response to network capacity
• CPC Class Codes: B60L 53/65 involving identification of vehicles or their battery types
• CPC Class Codes: B60L 58/12 responding to state of charge [SoC]
• CPC Class Codes: B60L 58/18 of two or more battery modules
• CPC Class Codes: H02J 2207/20 Charging or discharging characterised by the power electronics converter
• CPC Class Codes: H02J 2310/48 for electric vehicles [EV] or hybrid vehicles [HEV]
• CPC Class Codes: H02J 3/322 the battery being on-board an electric or hybrid vehicle, e.g. vehicle to grid arrangements [V2G], power aggregation, use of the battery for network load balancing, coordinated or cooperative battery charging
• CPC Class Codes: H02J 7/0013 acting upon several batteries simultaneously or sequentially H02J7/1423 takes precedence
• CPC Class Codes: H02J 7/02 for charging batteries from ac mains by converters
• CPC Class Codes: Y02E 60/00 Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
• 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 10/72 Electric energy management in electromobility
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 : Plug-in electric vehicles
• CPC Class Codes: Y02T 90/16 : Information or communication technologies improving the operation of electric vehicles
• CPC Class Codes: Y02T 90/167 : Systems integrating technologies related to power network operation and communication or information technologies for supporting the interoperability of electric or hybrid vehicles, i.e. smartgrids as interface for battery charging of electric vehicles [EV] or hybrid vehicles [HEV]
• CPC Class Codes: Y04S 10/126 : the energy generation units being or involving electric vehicles [EV] or hybrid vehicles [HEV], i.e. power aggregation of EV or HEV, vehicle to grid arrangements [V2G]
• CPC Class Codes: Y04S 30/12 : Remote or cooperative charging
• CPC Class Codes: Y04S 30/14 : Details associated with the interoperability, e.g. vehicle recognition, authentication, identification or billing

Abstract

This invention discloses a type of charging system for electric cars which includes an AC electric grid power supply system and an electric car charging equipment. The AC electric grid power supply system couples energy outputs to the electric car charging equipment; its characteristics are: it also includes an battery power system and an electrical energy control module. The electrical energy input of the battery power system is controlled by and connected to the AC electric grid power supply system. The output is controlled by the electrical energy control module and coupled to the electric car charging equipment. With the addition of one or more battery packs to the battery charging system, instantaneous current increase can be provided through the use of the battery packs in order to alleviate the demand on the electric grid. The design capacity of the battery charging system is more ideal and it reduces the instantaneous capacity overload. Meanwhile when the external electric grid fails, it can rely on the battery packs to charge electric cars and thus resolving any urgent charging needs.

Claims

1. A charging system, comprising:

an AC electric grid power supply system;

an electric car charging equipment;

a battery power system; and

an electrical energy control module;

wherein the input to the battery power system is connected to the AC electric grid power supply system and the output is controlled by the electrical energy control module and coupled to the electric car charging equipment; and

wherein when the AC electric grid power supply system is not supplying power, the electrical energy control module is configured to connect the battery power system electrically to the electric car charging equipment such that the battery power system provides power to the electric car charging equipment to charge an electric car.

2. The charging system of claim 1 wherein when a load on the charging system is high, the electrical energy control module is configured to connect the battery power system electrically to the electric car charging equipment such that the battery power system provides power to the electric car charging equipment to charge an electric car.

3. The charging system of claim 2 wherein when the AC electric grid power supply system is not supplying power, the electrical energy control module is configured to connect the battery power system electrically to the electric car charging equipment such that the battery power system provides power to the electric car charging equipment to charge an electric car.

4. The charging system of claim 1 wherein the battery power system has a battery charging module and one or more battery packs, and when the remaining capacity of the battery packs is low, the battery packs stop supplying power to the electric car charging equipment.

5. The charging system of claim 4 wherein the battery power system has a battery charging module and one or more battery packs, and when the remaining capacity of the battery packs is low, the battery packs are charged.

6. The charging system of claim 1 wherein the electrical energy control module includes a switch component (Q1), a voltage sampling circuit (R1, R2), a current sampling circuit (Rs), and a comparing circuit (U1A, U1B), wherein the voltage sampling circuit (R1, R2) samples voltages and the current sampling circuit (Rs) samples current;

wherein in the comparing circuit (U1A, U1B), the sampling voltage and sampling current are compared with a reference voltage and reference current set by the reference voltage and current setting circuit (Q2) respectively;

wherein when the sampling voltage value is lower than the reference voltage or the sampling current value is higher than the reference current, the switch component (Q1) is switched on to cause the battery power system (4) to connect to the electric car charging equipment.

7. The charging system of claim 6 wherein the electrical energy control module further includes a step-up circuit;

wherein when the sampling voltage value is lower than the reference voltage or the sampling current value is higher than the reference current, the switch component is switched on causing the battery power system (4) to connect to the electric car charging equipment through the step-up circuit.

8. The charging system of claim 7 wherein the step-up circuit includes a PWM control IC, a rectifier diode (D1), an output capacitor (C1), and a storage inductor (L1);

wherein the PWM control IC control ends are connected to the outputs of the comparing circuit (U1A, U1B);

the pulse signal output of the PWM control IC is connected to the control end of the switch component (Q1);

wherein the connection relationships among the switch component (Q1), the rectifier diode (D1), the output capacitor (C1), and the inductor (L1) satisfy the following requirement;

that the voltage of the battery packs of the battery power system undergoes the step-up process before connecting to the electric car charging equipment.

9. The charging system of claim 1, wherein the AC electric grid power supply system comprises:

an electric grid providing AC electrical energy; and

a transformer converting the electrical energy from the AC electric grid into DC and is connected to the electric car charging equipment.

10. The charging system of claim 1, wherein the charging system is provided with a plurality of the battery power systems and the electrical energy control modules, and each of the battery power system is connected to one of a plurality of the electric car charging equipment via the corresponding electrical energy control modules.

11. The charging system of claim 1, wherein the charging system is provided with the battery power system and a plurality of electrical energy control modules, and each of the electric energy control module is connected to one of a plurality of the electric car charging equipment and the battery power system.

12. An electric car charging system, comprising:

an AC electric grid power supply system;

an electric car charging equipment;

a battery power system having a battery charging module and one or more battery packs, wherein the battery power system selectively charges an electric car; and

an electrical energy control module;

wherein the input to the battery power system is connected to the AC electric grid power supply system and the output is controlled by the electrical energy control module and coupled to the electric car charging equipment; and

wherein when a load on the charging system is high, the electrical energy control module is configured to connect the battery power system electrically to the electric car charging equipment such that the battery power system provides power to the electric car charging equipment to charge an electric car.

13. The charging system of claim 12 wherein when the AC electric grid power supply system is not supplying power, the electrical energy control module is configured to connect the battery power system electrically to the electric car charging equipment such that the battery power system provides power to the electric car charging equipment to charge an electric car.

14. An electric car charging system, comprising:

an AC electric grid power supply system;

an electric car charging equipment;

a battery power system having a battery charging module and one or more battery packs; and

an electrical energy control module;

wherein the input to the battery power system is connected to the AC electric grid power supply system and the output is controlled by the electrical energy control module and coupled to the electric car charging equipment;

wherein there is one or more electric car charging stations each for charging an electric car, each station comprising an electric car charging equipment and an electrical energy control module;

wherein there is a battery charging system in each of the one or more electric car charging stations;

wherein the electrical energy control module of each of the one or more electric car charging stations controls the battery charging system;

wherein when the load on the one or more electric car charging stations is high, the battery charging system provides power to the electric car charging equipment;

wherein when the remaining capacity of the battery packs is low, the battery packs stop supplying power to the electric car charging equipment; and

wherein when the remaining capacity of the battery packs is low, the battery packs are charged.