US 2013/0278190 A1Published application

Method for Adjusting a DC Voltage Intermediate-Circuit Voltage

AssigneeRobert Bosch GmbH

InventorHolger Fink

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Abstract

A method is disclosed for adjusting a voltage of a DC-voltage intermediate circuit in a battery system having a battery and a drive system. The battery is configured to output one selectable output voltage from n+1 different output voltages. In a first step of the method, an actual value of the voltage of the DC-voltage intermediate circuit is determined, and is then compared with the various output voltages of the battery. A first selected output voltage of the battery, which is the highest voltage of those output voltages of the battery which are less than the actual value of the voltage of the DC-voltage intermediate circuit, and a second selected output voltage of the battery, which is the lowest voltage of those output voltages of the battery which are higher than the actual value of the voltage of the DC-voltage intermediate circuit, are then selected.

Claims11

Dependent claims

A method for adjusting a voltage of a DC voltage intermediate circuit in a battery system having a battery and a drive system, wherein the battery is connected to the drive system by way of the DC voltage intermediate circuit and comprises a number of n series-connected battery modules, wherein each series-connected battery module comprises a coupling unit and at least one battery cell that is connected between a first input and a second input of the coupling unit and is configured to provide either a battery module voltage or a voltage of zero in dependence upon a switching state of the coupling unit, and wherein n is greater than 1 so that the battery is configured to provide an output voltage that is selectable from n+1 different output voltages, the method comprising:

a) determining an instantaneous value of the voltage of the DC voltage intermediate circuit;
b) comparing the instantaneous value of the voltage of the DC voltage intermediate circuit with the different output voltages of the battery;
c) selecting a first selected output voltage of the battery that is the highest voltage of those output voltages of the battery that are lower than the instantaneous value of the voltage of the DC voltage intermediate circuit;
d) selecting a second selected output voltage of the battery that is the lowest voltage of those output voltages of the battery that are higher than the instantaneous value of the voltage of the DC voltage intermediate circuit;
e) providing the first selected output voltage of the battery during a first variable period of time;
providing the second selected output voltage of the battery during a second variable period of time;
and
g) repeating the steps a) to f) until the voltage of the DC voltage intermediate circuit achieves a desired operating voltage.

5 more elements

A battery system comprising:

a battery including a control unit, and a number of n series-connected battery modules, each series-connected battery module including a coupling unit and at least one battery cell that is connected between a first input and a second input of the coupling unit, and is configured to provide either a battery module voltage or a voltage of zero in dependence upon a switching state of the coupling unit;
a DC voltage intermediate circuit that is connected to the battery;
and
a drive system that is connected to the DC voltage intermediate circuit,
wherein n is greater than 1 so that the battery is configured to provide an output voltage that is selectable from n+1 different output voltages,
wherein the control unit is configured to perform a method for adjusting a voltage of the DC voltage intermediate circuit,
wherein the battery is connected to the drive system by way of the DC voltage intermediate circuit,
wherein the method includes
a) determining an instantaneous value of the voltage of the DC voltage intermediate circuit,
b) comparing the instantaneous value of the voltage of the DC voltage intermediate circuit with the different output voltages of the battery,
c) selecting a first selected output voltage of the battery that is the highest voltage of those output voltages of the battery that are lower than the instantaneous value of the voltage of the DC voltage intermediate circuit,
d) selecting a second selected output voltage of the battery that is the lowest voltage of those output voltages of the battery that are higher than the instantaneous value of the voltage of the DC voltage intermediate circuit,
e) providing the first selected output voltage of the battery during a first variable period of time,
f) providing the second selected output voltage of the battery during a second variable period of time, and
g) repeating the steps a) to f) until the voltage of the DC voltage intermediate circuit achieves a desired operating voltage.

12 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/825,063Filed 10 Aug 2011
Priority: DE 10 2010 041 046.20 Sep 2010
Published: 24 Oct 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification16 codes

B60L 58/22
Of two or more battery modules: balancing the charge of battery modules
H01M 10/441
Methods for charging or discharging: for several batteries or cells simultaneously or sequentially
H01M 10/482
Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte:…
H02J 7/50
Circuit arrangements for charging or discharging batteries or for supplying loads from batteries: acting upon multiple batteries simultaneously or…