METHOD FOR CONTROLLING THE POWER SUPPLY OF AN ELECTRIC MOTOR

• US 20130200824A1
• Filed: 07/04/2011
• Published: 08/08/2013
• Est. Priority Date: 07/02/2010
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Schmidt, Alexander
• Granted Patent: US 9,184,692 B2
• Time in Patent Office: Days
• US Class Current: 318/139
• CPC Class Codes: B60L 50/64 Constructional details of batteries specially adapted for electric vehicles
• 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: B60L 58/21 having the same nominal voltage
• CPC Class Codes: B60L 58/27 by heating
• CPC Class Codes: H01M 10/44 Methods for charging or discharging circuits for charging H02J7/00
• CPC Class Codes: H01M 10/441 for several batteries or cells simultaneously or sequentially
• CPC Class Codes: H01M 10/48 Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569
• CPC Class Codes: H01M 10/482 for several batteries or cells simultaneously or sequentially
• CPC Class Codes: H01M 10/613 Cooling or keeping cold
• CPC Class Codes: H01M 10/615 Heating or keeping warm
• CPC Class Codes: H01M 10/625 Vehicles
• CPC Class Codes: H01M 10/6567 Liquids
• CPC Class Codes: H01M 10/6571 Resistive heaters arrangements for heating the battery by its resistance to the internal current H01M10/637
• CPC Class Codes: H02J 7/0013 acting upon several batteries simultaneously or sequentially H02J7/1423 takes precedence
• CPC Class Codes: H02J 7/0069 Charging or discharging for charge maintenance, battery initiation or rejuvenation
• CPC Class Codes: H02P 31/00 Arrangements for regulating or controlling electric motors not provided for in groups H02P1/00 - H02P5/00, H02P7/00 or H02P21/00 - H02P29/00
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

A method and electrical system for controlling the power supply of an electric motor, in particular the electric motor of a vehicle that can be electrically driven, includes a control device that controls the power supply of the electric motor by an energy store. The energy store comprises a plurality of modules that are exposed to stress due to repeated charging and/or discharging and undergo an aging process as a result of said stress. In order to decouple the service life of the energy store from the service life of a vehicle, for example, the control device controls the charging and/or discharging of at least two modules differently such that said modules exhibit a stress difference so as to selectively reduce the aging process of the module being exposed to less stress.

Claims

1. A method for controlling the power supply of an electric motor, comprising:

controlling the power supply of the electric motor with a control device via an energy store, the energy store including a plurality of modules that experience stress through repeated charging and/or discharging and undergo an aging process as a result of the stress; and

controlling the charging and/or discharging of at least two modules differently with the control device such that these modules have a stress difference so as to selectively reduce the aging process of the module that is subjected to less stress.

2. The method as claimed in claim 1, wherein the modules are respectively arranged in a module circuit and connected in parallel.

3. The method as claimed in claim 2, wherein the different level of charging and/or discharging of the at least two of the modules is controlled by setting a resistance value of at least one variable resistor arranged in the module circuit.

4. The method as claimed in claim 3, wherein the resistance value is set such that the stress difference does not exceed a value of 20%.

5. The method as claimed in claim 2, wherein the different level of charging and/or discharging of the at least two of the modules is checked by the control device via an ammeter arranged in each module circuit and/or via a voltage measurement in the modules.

6. The method as claimed in claim 5, wherein the resistance value is readjusted based on data obtained from a current measurement and/or a voltage measurement.

7. The method as claimed in claim 1, wherein the control device takes into account the varying state of aging of the individual modules when forming the stress difference.

8. The method as claimed in claim 7, wherein the control device evaluates data relating to one or more of the voltage, the temperature, and/or the current of the modules, and calculates one or more of the capacity and the inner resistance of the modules to take into account the state of aging of the modules.

9. The method as claimed in claim 1, wherein the at least two modules have the same nominal voltage.

11. The method as claimed in claim 1, wherein the electric motor is an electric motor of a vehicle configured to be electrically driven.

10. An electrical system, comprising:

an energy store including a plurality of modules that are removably fastened and connected in parallel and each arranged in a module circuit;

a resistor arranged in each module circuit, the resistors each having a variably adjustable resistance value; and

a control device configured to adjust the resistance value in a targeted manner.

12. The electrical system as claimed in claim 10, wherein the electrical system is an electrical system for controlling the power supply of a vehicle that can be electrically driven, and wherein the energy store is for driving an electric motor of the vehicle.