ENERGY STORAGE DEVICE WITH HEATING DEVICE AND METHOD FOR HEATING ENERGY CELLS OF AN ENERGY STORAGE DEVICE

• US 20140099523A1
• Filed: 04/12/2012
• Published: 04/10/2014
• Est. Priority Date: 06/09/2011
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Feuerstack, Peter, Weissenborn, Erik, Kessler, Martin
• Granted Patent: US 9,350,053 B2
• Time in Patent Office: Days
• US Class Current: 429/50
• CPC Class Codes: B60L 58/19 Switching between serial connection and parallel connection of battery modules
• CPC Class Codes: B60L 58/27 by heating
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 10/425 Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing printed circuits H05K1/00
• CPC Class Codes: H01M 10/441 for several batteries or cells simultaneously or sequentially
• CPC Class Codes: H01M 10/486 for measuring temperature
• CPC Class Codes: H01M 10/615 Heating or keeping warm
• CPC Class Codes: H01M 10/63 Control systems charging or discharging in response to temperature H01M10/44 , H01M10/443; measurement of temperature H01M10/48 , H01M10/486
• CPC Class Codes: H01M 10/637 characterised by the use of reversible temperature-sensitive devices, e.g. NTC, PTC or bimetal devices; characterised by control of the internal current flowing through the cells, e.g. by switching means for preventing undesired use or discharge H01M50/572
• 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: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

The invention relates to an energy storage device (1) for generating an n-phase supply voltage for an electric machine (2), wherein n≧1, with n energy supply branches which are connected in parallel and which can each be connected to one of n phase conductors (2a, 2b, 2c), wherein each of the energy supply branches has a large number of energy storage modules (1a, 1b) which are connected in series and which each comprise: an energy storage cell module (5, 7) which has at least one energy storage cell (5a, 7a) and a coupling device (3), which is designed to connect the energy storage cell module (5, 7) selectively into the respective energy supply branch or to bridge said energy storage cell module, wherein in each case at least one of the energy storage modules (1b) also has in each case one heating element (8) for the at least one energy storage cell (7a); and a heating device (9), which is connected to the heating elements (8) and which is designed to actuate the heating elements (8) for heating the energy storage cells (7a) in the groups of energy storage modules (1b).

Claims

1. An energy storage device for generating an n-phase supply voltage for an electric machine, wherein n≧

1, the energy storage device comprising;

n energy supply branches, which are connected in parallel and can be connected in each case to one of n phase conductors, wherein each of the energy supply branches has a multiplicity of energy storage modules, which are connected in series and in each case comprise;

an energy storage cell module, which has at least one energy storage cell, and

a coupling device, which is designed to selectively switch the energy storage cell module into the respective energy supply branch or to bypass said module,

wherein in each case at least one of the energy storage modules also has in each case one heating element for the at least one energy storage cell; and

a heating device, which is connected to the heating elements and is designed to control the heating elements in order to heat the energy storage cells of. in each case, the at least one of the energy storage modules of each energy supply branch.

2. The energy storage device as claimed in claim 1, wherein the heating elements comprise PTC thermistors.

3. The energy storage device as claimed in claim 1, wherein, below a predefined temperature threshold value, the energy storage cells of, in each case, the at least one of the energy storage modules of each energy supply branch have a lower internal resistance than the energy storage cells of the other energy storage modules.

4. A system having:

an energy storage device as claimed in claim 1;

an n-phase electric machine, wherein n≧

1, the phase conductors of which are connected to phase connections of the energy storage device;

and

a control device, which is designed to selectively control the coupling devices of the energy storage modules in order to generate a supply voltage for the electric machine.

5. A method for heating energy cells of an energy storage device as claimed in claim 1, having the steps of:

detecting the temperature of the energy cells of the energy storage device; and

controlling the heating elements of the in each case at least one of the energy storage modules of each energy supply branch by means of the heating device depending on the detected temperature in order to heat the energy cells of the in each case at least one of the energy storage modules of each energy supply branch.

6. The method as claimed in claim 5, also having the step of:

controlling the coupling devices of the in each case at least one of the energy storage modules of each energy supply branch in order to generate a supply voltage on the phase conductors of an electric machine from the output voltages of the heated energy cells, when the temperature of the heated energy cells exceeds a predefined temperature threshold value.

7. The method as claimed in claim 6 when used in a system as claimed in claim 4, wherein the step of controlling the coupling devices is performed when the current demand of the n-phase electric machine exceeds a predefined current-demand threshold value.