Method and Apparatus for the Management of Battery Cells

• US 20090218986A1
• Filed: 05/07/2007
• Published: 09/03/2009
• Est. Priority Date: 05/05/2006
• Status: Abandoned Application

• Current Assignee: Oy Finnish Electric Vehicle Technologies, Ltd.
• Original Assignee: Oy Finnish Electric Vehicle Technologies, Ltd.
• Inventors: Jarvinen, Jukka
• Application Number:
  US12/299,434
• Publication Number:
  US 20090218986A1
• Time in Patent Office: Days
• US Class Current: 320/119
• CPC Class Codes: B60L 2240/545 Temperature
• CPC Class Codes: B60L 2240/547 Voltage
• CPC Class Codes: B60L 2240/549 Current
• CPC Class Codes: B60L 2240/70 Interactions with external data bases, e.g. traffic centres
• CPC Class Codes: B60L 53/11 DC charging controlled by the charging station, e.g. mode 4
• CPC Class Codes: B60L 58/22 Balancing the charge of battery modules
• CPC Class Codes: B60L 58/26 by cooling
• CPC Class Codes: B60L 58/27 by heating
• CPC Class Codes: H01M 10/4207 for several batteries or cells simultaneously or sequentially
• CPC Class Codes: H01M 10/441 for several batteries or cells simultaneously or sequentially
• CPC Class Codes: H02J 7/0014 Circuits for equalisation of charge between batteries
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles
• CPC Class Codes: Y02T 90/16 Information or communication technologies improving the operation of electric vehicles

Abstract

A method and apparatus for the management of rechargeable series-connected cells (C1, C2, C3) by means of individual measurements, by monitoring each cell during the course of its charging, storage or discharging cycle for measuring the cell properties and for adjusting the properties of inconsistent cells by manipulating the same for mitigating inter-cellular discrepancies.

Claims

1. A method for the management of rechargeable series-connected cells (C1, C2, C3) by means of individual measurements and applied statistics, wherein each cell is monitored during the course of its charging, storage or discharging cycle for measuring the cell properties, and the cells better than others are treated in a way that they are stressed more than others during the chare-discharge cycle, or the deterioration of cells weaker than others is slowed down by stressing them less than other cells in a way that the properties of cells are permanently closing to each other.

2. A method as set forth in claim 1, wherein for each cell is determined an optimal operational area in the used capacity window, in a way that for each cell is determined the charge and discharge levels or temperature areas, following of which results to cell properties approaching each other and finally the individual cells behaviour approaches each other, and the battery behaviour as whole in the whole area of charge window improves so that the battery can be charged and discharged in the ends of the charge window with higher currents without safety or damage risk.

3. A method for equalizing battery cell capacities as part of the method as set forth in claim 1, wherein in accordance the measured values the cell charge levels are maintained in an optimal state for entire system in a way that the cells are not always charged as full, but some of the cells are left lower charge than others to slow down the cell active material deterioration and therefore the for equalizing the relatively weaker cell'"'"'s capacity to the level of other cells.

4. A method as set forth in claim 1, wherein properties of a single cell or group of cells are deteriorated permanently by charging more than others, discharging deeper than others, causing heating more than others, or stressing single cells other ways different than others to cause the discrepancies between the cells to mitigate.

5. A method as set forth in claim 3, wherein properties of a single cell or group of cells are adjusted by easing the operating conditions of cells weaker than others by for example charging them during the discharge cycle and respectively charging them in a way needed by the cell during the charge cycle.

6. A method as set forth in claim 1, wherein for each cell is assigned an optimal operating area in usable capacity window in respect to other cells.

7. A method as set forth in claim 1, wherein the method further comprises a step, in which cell measurement information is collected from several battery of cells to develop and test the management algorithm.

8. A method as set forth in claim 7, wherein the method further comprises a step, in which the management algorithm is updated to group of cell management devices remotely.

9. An apparatus for the management of cells, said apparatus comprising means for measuring serially connected battery cells, wherein the apparatus comprises means for measuring inter-cellular inconsistencies in a battery and means for individually manipulating the cells at least during the charge and discharge cycle in order to permanently mitigate inter-cellular discrepancies in properties during the future charge discharge cycles.

10. An apparatus as set forth in claim 9, wherein the charge adjusting means connected in parallel with single cells are dimensioned for a small current that is maximum 2% of the current caused by main charger or load.

11. Software for use in battery management, wherein the software keeps track on the properties of cells and causes intentionally partial deterioration of cells better than others, or stresses less the cells weaker than others.

12. A system for battery management wherein the highest control level of the logic is situated outside of the management apparatus in a external server in the remote end of telecommunications connection, in which case the external server can authenticate the battery management apparatus or it'"'"'s data for management, registering, or the management algorithms against forgery or copying.