Energy storage
First Claim
1. An arrangement for storing electrical energy comprising:
- an electric charge source operable to produce a DC-system voltage between a first terminal and a second terminal, a plurality of electrical storage modules connected in series between the first terminal and the second terminal, each electric storage module having a respective nominal module voltage;
a DC-to-DC converter coupled to the electric charge source and to each of the electrical storage modules, the DC-to-DC converter being operable to receive incoming power from the electric charge source and to deliver a respective voltage fraction of the DC-system voltage to each of the modules wherein the DC-to-DC converter is operable to control each of the voltage fractions to vary each fraction over time within a voltage interval around the respective nominal module voltage of each module.
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Accused Products
Abstract
The present invention relates to storage of electrical energy in a number of electrical storage modules, which are connected in series to one another. A DC-system voltage (VTOT) is received and DC-to-DC converted into one voltage fraction (V1, V2) per electrical storage module. The respective voltage fractions (V1, V2) are delivered to each module and varied over time (t) within an interval (VD) around a respective nominal module voltage (V1n, V2n). Thereby, the charging voltage is temporarily increased to a level which is sufficiently high to obtain an improved load capacity for each module. At the same time, the overall voltage over the electrical storage modules may be held at a harmless level with respect to any units that are included in the relevant electric circuitry.
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Citations
18 Claims
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1. An arrangement for storing electrical energy comprising:
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an electric charge source operable to produce a DC-system voltage between a first terminal and a second terminal, a plurality of electrical storage modules connected in series between the first terminal and the second terminal, each electric storage module having a respective nominal module voltage;
a DC-to-DC converter coupled to the electric charge source and to each of the electrical storage modules, the DC-to-DC converter being operable to receive incoming power from the electric charge source and to deliver a respective voltage fraction of the DC-system voltage to each of the modules wherein the DC-to-DC converter is operable to control each of the voltage fractions to vary each fraction over time within a voltage interval around the respective nominal module voltage of each module. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 17)
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10. A method of charging a plurality of electrical storage modules comprising the steps of connecting the modules in series between a first terminal and a second terminal;
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receiving a DC-system voltage between the first terminal and the second terminal, DC-to-DC converting the DC-system voltage into a respective voltage fraction per module;
delivering its respective voltage fraction to each of the modules, and controlling each of the voltage fractions to vary over time within a voltage interval (VD) around a respective nominal module voltage. - View Dependent Claims (11, 12, 13, 14, 18)
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15. A computer program directly loadable into the internal memory of a computer, comprising software for controlling steps when the program is run on the computer, the steps being controlled comprising
receiving a DC-system voltage between the first terminal and the second terminal, DC-to-DC converting the DC-system voltage into a respective voltage fraction per module; -
delivering its respective voltage fraction to each of the modules, and controlling each of the voltage fractions to vary over time within a voltage interval (VD) around a respective nominal module voltage. - View Dependent Claims (16)
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Specification