Power Storage Device For Hybrid Or Electric Motor Vehicles, And Associated Electric Power Management Method

• US 20110108340A1
• Filed: 07/03/2009
• Published: 05/12/2011
• Est. Priority Date: 07/04/2008
• Status: Active Grant

• Current Assignee: Peugeot Citroen Automobile SA (Stellantis NV)
• Original Assignee: Peugeot Citroen Automobile SA (Stellantis NV)
• Inventors: Cherouvrier, Guillaume
• Granted Patent: US 8,434,578 B2
• Time in Patent Office: Days
• US Class Current: 180/65.265
• CPC Class Codes: B60K 6/28 characterised by the electric energy storing means, e.g. batteries or capacitors
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 10/26 for electrical energy, e.g. batteries or capacitors
• CPC Class Codes: B60W 20/13 in order to stay within battery power input or output limits; in order to prevent overcharging or battery depletion
• CPC Class Codes: B60W 2510/244 Charge state
• CPC Class Codes: B60Y 2400/112 Batteries
• CPC Class Codes: B60Y 2400/114 Super-capacities
• CPC Class Codes: Y02T 10/62 Hybrid vehicles

Abstract

The invention essentially relates to an electric power storage device (1) for hybrid or electric motor vehicles, comprising: a high voltage power supply bus (2) to be connected to an electric traction system (7) and/or to an onboard electric power system, and a first electric power storage element (3) connected to said power supply bus (2). According to the invention, a second storage element (4) is connected to the bus (2) via an electric coupling member (5), said second storage element (4) being connected to the bus (2) in parallel relative to the first storage element (3). One of the two storage elements (3, 4) includes an electrochemical battery, while the other storage element (3, 4) includes an ultracapacitor.

Claims

1. An electrical energy storage device for hybrid or electric type vehicles, comprising:

a high voltage supply bus intended to be connected to an electrical drive system and/or to an on-board electrical network,

a first storage element for electrical energy connected to said supply bus,

a second storage element connected to the high voltage bus through the intermediary of an electrical coupling element that adapts the voltage levels of the first storage element to the voltage levels of the second storage element and vice versa,

the second storage element being connected to bus in parallel relative to the first storage element,

one of the two storage elements comprising a battery with electrochemical cells, while the other storage element comprises a supercapacitor.

2. The device according to claim 1, wherein the first storage element comprises a supercapacitor, and the second storage element comprises a battery with electrochemical cells.

3. The device according to claim 2, wherein the first storage element comprises a supercapacitor delivering a voltage between 80 and 150 Volt and suitable to supply a power between 15 and 35 kW.

4. The device according to claim 2, wherein the second storage element comprises a battery with electrochemical cells delivering a voltage between 12 and 60 Volt and with storage capacity between 2 and 20 Mega Joules.

5. The device according to claim 2, wherein the coupling element is a direct-direct (DC/DC) reversible converter with power between 1 and 5 kW.

6. A hybrid or electric type automotive vehicle equipped with an energy storage device;

the energy storage system comprising

a high voltage supply bus intended to be connected to an electrical drive system and/or to an on-board electrical network,

a first storage element for electrical energy connected to said supply bus,

a second storage element connected to the high voltage bus through the intermediary of an electrical coupling element that adapts the voltage levels of the first storage element to the voltage levels of the second storage element and vice versa,

the second storage element being connected to bus in parallel relative to the first storage element,

one of the two storage elements comprising a battery with electrochemical cells, while the other storage element comprises a supercapacitor;

the vehicle comprising;

an on-board network connected to the high voltage bus through the intermediary of a second electrical coupling element, and

an electric drive system connected to the high voltage bus through the intermediary of an alternating/direct converter.

7. The vehicle according to claim 6, wherein the converter accepts voltages between 80 and 150 Volt and has a power of approximately 40 kW, while the direct/direct converter supports a power of approximately 1 kW.

8. A method for managing electrical energy in a hybrid or electric vehicle, the vehicle comprising:

a high voltage supply bus intended to be connected to an electrical drive system and/or to an on-board electrical network,

a first storage element for electrical energy connected to said supply bus,

a second storage element connected to the high voltage bus through the intermediary of an electrical coupling element that adapts the voltage levels of the first storage element to the voltage levels of the second storage element and vice versa,

the second storage element being connected to bus in parallel relative to the first storage element,

one of the two storage elements comprising a battery with electrochemical cells, while the other storage element comprises a supercapacitor;

an on-board network connected to the high voltage bus through the intermediary of a second electrical coupling element, and

an electric drive system connected to the high voltage bus through the intermediary of an alternating/direct converter;

wherein, when the vehicle is operated in a pure electrical drive phase, the method comprises the electrical drive system drawing energy from the terminals of supercapacitor to ensure the traction of the vehicle, while electrical energy is transferred from the battery to the supercapacitor through the intermediary of a coupling element in order to compensate the energy draw.

9. The method according to claim 8, wherein, when the vehicle is in a recuperation phase of electrical energy, the method comprises the supercapacitor storing energy supplied by the electrical drive system;

while electrical energy is transferred from supercapacitor to the battery through the intermediary of the coupling element in order to slow down the charging of the supercapacitor.

10. The method according to claim 8, wherein, if at the end of en energy recuperation phase, the supercapacitor is in charged state, a transfer of energy takes place, by preference during a pure combustion engine drive phase, from supercapacitor to battery, so that the charge level (Vf, Vf′

) of the supercapacitor is such that the supercapacitor can store electrical energy supplied by the electrical drive system if the vehicle enters an energy recuperation phase;

or supply energy to the electrical drive system if the vehicle operates in electric mode.

11. The method according to claim 8, wherein, if at the end of a pure electrical traction phase, the supercapacitor is in a discharged state, a transfer of energy takes place, by preference during a pure combustion engine drive phase, from battery to supercapacitor, so that the charge level (Vf, Vf′

) of the supercapacitor is such that the supercapacitor can store electrical energy supplied by the electrical drive system if the vehicle enters an energy recuperation phase;

or supply energy to the electrical drive system if the vehicle operates in electric mode.