Energy storage device for a motor vehicle

Patent metadata

Field	Value
Publication number	US-10800286-B2
Application number	US-201716314068-A
Country	US
Kind code	B2
Filing date	Jun 9, 2017
Priority date	Jul 1, 2016
Publication date	Oct 13, 2020
Grant date	Oct 13, 2020

Abstract

An energy storage device for a motor vehicle includes a first energy store and a second energy store for storing electrical energy, a charging connection for charging the energy stores, an operating connection for operating a load on the energy storage device, and a switching device which has a plurality of switching elements and via which the energy stores can be connected selectively in series or in parallel. A fifth switching element of the switching device is permanently electrically coupled to the electrical poles of opposite polarity of the energy stores and the energy stores can be connected in series via the fifth switching element independently of the other switching elements of the switching device.

First claim

The invention claimed is:

1. An energy storage device for a motor vehicle, comprising:
a first energy store and a second energy store for storing electrical energy;
a charging connection for charging the first energy store and the second energy store;
an operating connection for operating a consumer on the energy storage device; and
a switching device, wherein the switching device includes a first switching element, a second switching element, a third switching element, a fourth switching element, a fifth switching element, a sixth switching element, and a seventh switching element and wherein the first energy store and the second energy store are selectively connectable in series or in parallel by the switching elements of the switching device;
wherein the fifth switching element is permanently electrically coupled to electrical poles of opposite polarity of the first energy store and the second energy store and wherein the first energy store and the second energy store are connectable in series by the fifth switching element independently of the other switching elements of the switching device;
wherein a positive pole of the charging connection is electrically decoupleable from the respective positive poles of the first energy store and the second energy store by the third switching element;
wherein a negative pole of the charging connection is electrically decoupleable from the respective negative poles of the first energy store and the second energy store by the fourth switching element;
wherein the third switching element is a battery contactor or a charging contactor and/or the fourth switching element is a battery contactor or a charging contactor.

2. The energy storage device according to claim 1 , wherein the positive pole of the second energy store is electrically decoupleable from the operating connection and from the charging connection by the first switching element coupled to the positive pole of the second energy store.

3. The energy storage device according to claim 1 , wherein the negative pole of the first energy store is electrically decoupleable from the operating connection and from the charging connection by the second switching element coupled to the negative pole of the first energy store.

4. The energy storage device according to claim 1 , wherein the positive pole of the first energy store is electrically decoupleable from the operating connection and from the charging connection by the sixth switching element coupled to the positive pole of the first energy store.

5. The energy storage device according to claim 1 , wherein the negative pole of the second energy store is electrically decoupleable from the operating connection and from the charging connection by the seventh switching element coupled to the negative pole of the second energy store.

6. The energy storage device according to claim 1 , wherein the fifth switching element is a semiconductor switching element.

Assignees

• Daimler Ag

Inventors

• Doersam Thomas
• Eichinger Andreas
• Falsett Rainer
• Hachtel Heiko
• Herb Frieder
• Lehmann Oliver
• Ohms Christian

Classifications

• H02J2105/37

  exchanging power with electric vehicles [EV] or with hybrid electric vehicles [HEV] · CPC title

• H02J7/575 Primary

  Parallel/serial switching of connection of batteries to charge or load circuit · CPC title

• B60L58/19 Primary

  Switching between serial connection and parallel connection of battery modules · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• Y02T10/70

  Energy storage systems for electromobility, e.g. batteries · CPC title