Dual rechargeable battery arrangement

Patent metadata

Field	Value
Publication number	US-10110034-B2
Application number	US-201715680692-A
Country	US
Kind code	B2
Filing date	Aug 18, 2017
Priority date	Feb 19, 2015
Publication date	Oct 23, 2018
Grant date	Oct 23, 2018

Abstract

The rechargeable battery arrangement includes a first plurality of series-connected first charge storage cells, a second plurality of series-connected second charge storage cells, and a third plurality of series-connected third charge storage cells. The arrangement further includes a first converter having a first connection pair is connected to the third plurality of series-connected third charge storage cells, and a second connection pair, connected in series with the first plurality of series-connected first charge storage cells. A series connection consisting of the first plurality of first charge storage cells and the first converter is connected in parallel to the second plurality of second charge storage cells. Moreover, the first converter is configured to convert at least one of a voltage and a current supplied by the third plurality of series-connected third charge storage cells, and to output said voltage and/or current at the second connection pair. In addition, a lowest potential of the second plurality of series-connected second charge storage cells forms a first connection of the accumulator arrangement, and a highest potential of the second plurality of series-connected second charge storage cells forms a second connection of the accumulator arrangement.

First claim

What is claimed is:

1. An accumulator arrangement comprising:
a first plurality of series-connected first charge storage cells;
a second plurality of series-connected second charge storage cells;
a third plurality of series-connected third charge storage cells;
a first converter comprising a first connection pair and a second connection pair, wherein the first connection pair of the first converter is connected to the third plurality of series-connected third charge storage cells,
wherein the second connection pair of the first converter is connected in series with the first plurality of series-connected first charge storage cells,
wherein a series connection consisting of the first plurality of first charge storage cells and the first converter is connected in parallel to the second plurality of second charge storage cells,
wherein the first converter is configured to convert at least one of a voltage and a current supplied by the third plurality of series-connected third charge storage cells, and to output said at least one of the voltage and current supplied by the third plurality of series-connected third charge storage cells at the second connection pair, and
wherein a lowest potential of the second plurality of series-connected second charge storage cells forms a first connection of the accumulator arrangement, and a highest potential of the second plurality of series-connected second charge storage cells forms a second connection of the accumulator arrangement; and

a control device,
wherein, if an electric machine connected to the accumulator arrangement has a higher current consumption for a predefined period of time, the control device is configured to activate the first converter such that charge is drawn from the first plurality of series-connected first charge storage cells and from the third plurality of series-connected third charge storage cells, and
wherein, if the electric machine has a constant power consumption for a predefined period of time, the control device is further configured to activate the first converter such that charge is drawn only from the second plurality of series-connected second charge storage cells.

2. The accumulator arrangement according to claim 1 , further comprising:
a second converter comprises a first connection pair and a second connection pair,
wherein the first connection pair of the second converter is connected to the second plurality of second charge storage cells,
wherein the second connection pair of the second converter is connected to the third plurality of third charge storage cells, and
wherein the second converter is configured to transport an electric charge from the second plurality of second charge storage cells to the third plurality of third charge storage cells.

3. The accumulator arrangement according to claim 2 ,
wherein the control device is configured to activate the second converter such that charge is drawn from the second plurality of second charge storage cells and is supplied to the third plurality of third charge storage cells.

4. The accumulator arrangement according to claim 2 ,
wherein said first charge storage cells and third charge storage cells are configured for a higher current output and/or a shorter-duration current output than the second charge storage cells, and
wherein the second charge storage cells are configured for a higher capacitance than the first charge storage cells and the third charge storage cells.

5. The accumulator arrangement according to claim 4 ,
wherein the first charge storage cells and the third charge storage cells comprise a capacitor, and that the second charge storage cells comprise an accumulator.

6. The accumulator arrangement according to claim 1 , further comprising:
a third converter comprises a first connection pair and a second connection pair; and
a fourth plurality of series-connected fourth charge storage cells connected to the first connection pair of the third converter,
wherein the second connection pair of the third converter is connected in series with the second plurality of second charge storage cells,
wherein the third converter is configured to convert at least one of a voltage and a current supplied by the fourth plurality of series-connected fourth charge storage cells, and output the at least one of the voltage and a current supplied by the fourth plurality of series-connected fourth charge storage cells at the second connection pair of the third converter.

7. The accumulator arrangement according to claim 6 ,
wherein, if an electric machine connected to the accumulator arrangement has a higher current consumption for a predefined time period, the control device is further configured to activate the third converter such that charge is drawn from the first plurality of series-connected first charge storage cells, and
wherein, if the electric machine has a constant power consumption for a predefined period of time, the control device is further configured to activate the third converter such that charge is drawn only from the second plurality of series-connected second charge storage cells and the fourth plurality of series-connected fourth charge storage cells.

8. The accumulator arrangement according to claim 6 ,
wherein said first charge storage cells and third charge storage cells are configured for a higher current output and/or a shorter-duration current output than the second charge storage cells, and
wherein the second charge storage cells are configured for a higher capacitance than the first charge storage cells and the third charge storage cells.

9. The accumulator arrangement according to claim 8 ,
wherein the first charge storage cells and the third charge storage cells comprise a capacitor, and that the second charge storage cells comprise an accumulator.

10. The accumulator arrangement according to claim 1 ,
wherein said first charge storage cells and third charge storage cells are configured for a higher current output and/or a shorter-duration current output than the second charge storage cells, and
wherein the second charge storage cells are configured for a higher capacitance than the first charge storage cells and the third charge storage cells.

11. The accumulator arrangement according to claim 10 ,
wherein the first charge storage cells and the third charge storage cells comprise a capacitor, and that the second charge storage cells comprise an accumulator.

12. The accumulator arrangement according to claim 1 ,
wherein a number of third charge storage cells is lower than approximately 25% of a number of first charge storage cells.

13. A drive system for a vehicle having an electric drive, the drive system comprising:
the accumulator arrangement according to claim 1 ;
an inverter having AC and DC connections; and
an electric machine,
wherein the accumulator arrangement is connected to the DC connections of the inverter, and the electric machine is coupled to the AC connections of the inverter.

14. An accumulator arrangement comprising:
a first plurality of series-connected first charge storage cells;
a second plurality of series-connected second charge storage cells;
a third plurality of series-connected third charge storage cells; and
a first converter comprising a first connection pair and a second connection pair, wherein the first connection pair of the first converter is connected to the third plurality of series-connected third charge storage cells,
wherein the second connection pair of the first converter is connected in series with the first plurality of series-connected first charge storage cells,
wherein a series

Assignees

• Bayerische Motoren Werke Ag

Inventors

• Gruber Dominik
• Reuss Joerg
• Schmitz Andre

Classifications

• B60L58/20

  having different nominal voltages · CPC title

• H02P27/06

  using DC to AC converters or inverters (H02P27/05 takes precedence) · CPC title

• B60L2260/162

  of electrical cells or capacitors · CPC title

• B60L50/51

  characterised by AC-motors · CPC title

• B60L2210/14

  Boost converters · CPC title