Apparatus and method for intelligent battery optimization and equalization management system

• US 9,912,017 B1
• Filed: 09/01/2015
• Issued: 03/06/2018
• Est. Priority Date: 09/03/2014
• Status: Active Grant

• Current Assignee: Bingxin Zhao, Ho-Hsun David Kuo, Xiang Meng
• Original Assignee: Bingxin Zhao, Ho-Hsun David Kuo, Xiang Meng
• Inventors: Kuo, Ho-Hsun David, Zhao, Bingxin, Meng, Xiang
• Primary Examiner(s): Alam, Mohammed
• Application Number:
  US14/842,346
• Time in Patent Office: 917 Days
• Field of Search: 320112
• CPC Class Codes: H01M 10/052 Li-accumulators
• 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 10/46 Accumulators structurally combined with charging apparatus circuits for charging H02J7/00
• CPC Class Codes: H01M 10/482 for several batteries or cells simultaneously or sequentially
• CPC Class Codes: H01M 10/486 for measuring temperature
• CPC Class Codes: H01M 2010/4271 Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
• CPC Class Codes: H01M 2220/20 Batteries in motive systems, e.g. vehicle, ship, plane
• CPC Class Codes: H02J 7/0016 using shunting, discharge or bypass circuits
• CPC Class Codes: H02J 7/0049 Detection of fully charged condition
• 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

An intelligent battery optimization management and equalization system that also monitors all cells within a battery. The system will ensure all cells are charged to maximum capacity, discharges the full capacity of each cell, perform equalization of charges between all the cells, manages and monitors each cell within a battery pack.

Claims

1. A battery management system to provide optimization and equalization management for a battery containing a plurality of individual battery cells, the system comprising:

a plurality of battery cell controllers, each comprising a controllable switch, with each battery cell controller electrically and conductively coupled to an individual battery cell via the controllable switch;

a master controller, electrically and conductively coupled to each of the plurality of battery cell controllers, for supplying a charging current to the plurality of individual battery cells via the plurality of battery cell controllers,

wherein each battery cell controller measures a charge level of the individual battery cell to which it is coupled and transmits said measures to the master controller, wherein if the master controller determines that the individual battery cell is at full capacity based on the charge level, then the charging current is shunted away from the individual battery cell or a trickle charging is provided to the individual battery cell to maintain the charge level at full capacity,

wherein the trickle charging is implemented by controlling an ON/OFF duty cycle of the controllable switch to supply a desired trickle charging current to the individual battery cell determined to be at full capacity.

2. The battery management system of claim 1 wherein the individual battery cell is a Lithium battery cell, Lithium-ion battery cell, Lithium polymer battery cell, electrolytic battery cell, or electrochemical battery cell.

3. The battery management system of claim 1 wherein the individual battery cell is a cell package comprising multiple battery elements.

4. The battery management system of claim 1 wherein the master controller receives an input from each battery cell controller and generates an output for each battery cell controller based at least on the input from each battery cell controller, wherein the input from each battery cell controller comprises at least one of a voltage across the electrically and conductively coupled individual battery cell, a current through the electrically and conductively coupled individual battery cell and a temperature of the electrically and conductively coupled individual battery cell.

5. The battery management system of claim 4 wherein the master controller generates an output for each battery cell controller based on a comparison between the voltage across each electrically and conductively coupled individual battery cell and a first voltage range.

6. The battery management system of claim 4 wherein the master controller generates an output for each battery cell controller based on a comparison between the temperature of the electrically and conductively coupled individual battery cell and a temperature range.

7. The battery management system of claim 4 wherein the master controller generates an output for each battery cell controller further based on a comparison between the voltages across each individual battery cell and an average voltage of the plurality battery cells.

10. The battery management system of claim 1, wherein the charging current is shunted away from the individual battery cell determined to be at full capacity by switching OFF the controllable switch coupled to the individual battery cell determined to be at full capacity.

11. The battery management system of claim 1, wherein when the plurality of battery cells is not at full capacity, being charged, or discharging, the mater controller communicates with each battery cell controller to perform equalization of the charge level of the plurality of battery cells to a common charge level, wherein trickle charging maintains the charge level of each battery cell at the common charge level.

8. A rechargeable battery pack comprising:

a plurality of individual battery cells;

a plurality of battery cell controllers, each comprising a controllable switch, wherein each battery cell controller is electrically and conductively coupled to an individual battery cell via the controllable switch;

a master controller, electrically and conductively coupled to each of the plurality of battery cell controllers, for supplying a charging current to the plurality of individual battery cells via the plurality of battery cell controllers,

wherein each battery cell controller measures a charge level of the individual battery cell to which it is coupled and transmits said measures to the master controller, wherein if the master controller determines that the individual battery cell is at full capacity based on the charge level, then the charging current is shunted away from the individual battery cell or a trickle charging is provided to the individual battery cell, via the battery cell controller, to maintain the charge level at full capacity,

wherein the trickle charging is implemented by controlling an ON/OFF duty cycle of the controllable switch to supply a desired trickle charging current to the individual battery cell determined to be at full capacity.

9. The rechargeable battery pack of claim 8 wherein the master controller receives an input from each battery cell controller and generates an output for each battery cell controller based at least on the input from each battery cell controller, wherein the input from each battery cell controller comprises at least one of a voltage across the electrically and conductively coupled individual battery cell, a current through the electrically and conductively coupled individual battery cell and a temperature of the electrically and conductively coupled individual battery cell.

12. The rechargeable battery pack of claim 8, wherein the charging current is shunted away from the individual battery cell determined to be at full capacity by switching OFF the controllable switch coupled to the individual battery cell determined to be at full capacity.

13. The battery management system of claim 8, wherein when the plurality of battery cells is not at full capacity, being charged, or discharging, the mater controller communicates with each battery cell controller to perform equalization of the charge level of the plurality of battery cells to a common charge level, wherein trickle charging maintains the charge level of each battery cell at the common charge level.