News Column

Researchers Submit Patent Application, "Battery Management System and Managing Method Thereof", for Approval

June 25, 2014



By a News Reporter-Staff News Editor at Electronics Newsweekly -- From Washington, D.C., VerticalNews journalists report that a patent application by the inventors CHEON, Eun (Seoul, KR); CHUNG, Jinhwa (Seoul, KR), filed on December 5, 2013, was made available online on June 12, 2014.

The patent's assignee is Fairchild Korea Semiconductor Ltd.

News editors obtained the following quote from the background information supplied by the inventors: "(a) Field of the Invention

"The present invention relates to a battery management system and a managing method thereof.

"(b) Description of the Related Art

"A battery has a function of being charged with electrical energy to supply the electrical energy to various electronic devices. Particularly, a secondary battery may be recharged with the electrical energy and is realized as a stack of a plurality of cells to increase output thereof. The secondary battery including the plurality of cells needs a battery management system (hereafter, referred to as 'BMS') managing the plurality of cells.

"When multiple cells are coupled in series, balancing of the mutual cells is important factor. The balancing of the mutual cells, that is, the cell balancing, means to maintain each voltage charged to the plurality of cells forming the battery within a permitted range. The cell balancing closely relates to life-span of the battery and output power, and when the cell balancing is not ordinarily operated, the cell is deteriorated such that the life-span of the battery is not only shortened but also the output power may be reduced.

"In a conventional balancing method, a separate resistor is respectively disposed for a plurality of cells, and the voltage of each cell is measured to discharge a cell having a high voltage through line resistance thereby decreasing the voltage of the cell. It is assumed that the voltage of a first cell is higher than the voltage of a second cell in a battery including the first cell and the second cell. When simultaneously charging the first cell and the second cell, the first cell is charged until reaching a highest voltage of the permitted range. At this time, the first cell is discharged through the resistor, and the charging of the second cell is stopped. Also, when the first cell is discharged until reaching a predetermined voltage, the first cell and the second cell are again simultaneously charged. When this operation is repeated such that the voltage difference between the first cell and the second cell is in a predetermined range, the balancing is finally finished.

"However, in the conventional method, the time that it takes for the first cell to initially reach the highest voltage is short such that the initial charging time of the second cell is short, and thereby the cell balancing period is increased.

"The above information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art."

As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventors' summary information for this patent application: "The present invention provides a battery management system having a fast cell balancing period and a managing method thereof.

"According to an exemplary embodiment of the present invention, a battery management system is provided. The battery management system includes: a charging switch charging a first cell having a first voltage and a second cell having a second voltage lower than the first voltage into a first current; a plurality of balancing switches respectively coupled to the first cell and the second cell and respectively discharging the first cell and the second cell into a second current; and a controller controlling the charging or the discharging of the first cell and the second cell to position the first voltage of the first cell between a maximum voltage and a first reference voltage lower than the maximum voltage, and turning-on the balancing switch of the first cell till the second voltage becomes a second reference voltage if the first voltage of the first cell reaches the second reference voltage lower than the first reference voltage at a time of the changing

"The first current may be higher than the second current

"The controller may turn-off the balancing switch of the first cell till the first voltage becomes the maximum voltage if the second voltage reaches the second reference voltage. The controller may maintain the balancing switch of the second cell as a turn-off state if the second voltage reaches the second reference voltage

"The controller may turn-off the charging switch, turns-on the balancing switch of the first cell, and turns-off the balancing switch of the second cell till the first voltage becomes the first reference voltage if the first voltage reaches the maximum voltage and the second voltage is lower than the first reference voltage. The controller may turn-on the charging switch and turn-on the balancing switch of the first cell and the balancing switch of the second cell till the first voltage becomes the maximum voltage if the first voltage reaches the first reference voltage and the second voltage is lower than the first reference voltage. The controller may turn-on the charging switch and turn-off the balancing switch of the first cell and the balancing switch of the second cell till the first voltage becomes the maximum voltage if the first voltage reaches the first reference voltage and the second voltage is lower than the first reference voltage.

"The battery management system may further include: a selector receiving and transmitting an information of the first voltage, an information of the second voltage, an information of the first current, and an information of the second current to the controller.

"The battery management system may further include: a switch driver controlled by the controller and driving the plurality of balancing switch and the charging switch.

"According to another exemplary embodiment of the present invention, a battery managing method is provided. The battery managing method includes: charging a first cell having a first voltage and a second cell having a second voltage lower than the first voltage into a first current by using a charging switch; comparing the first voltage and the second voltage with a first reference voltage lower than a maximum voltage; controlling a charging or a discharging of the first cell and the second cell to position the first voltage of the first cell between the maximum voltage and the first reference voltage; and turning-on a first balancing switch corresponding to the first cell till the second voltage becomes a second reference voltage if the first voltage of the first cell reaches the second reference voltage lower than the first reference voltage.

"The first current may be higher than the second current

"The battery managing method may further include: turning-off the first balancing switch till the first voltage becomes the maximum voltage if the second voltage reaches the second reference voltage. The battery managing method may further include: maintaining a second balancing switch corresponding to the second cell as a turn-off state if the second voltage reaches the second reference voltage.

"The battery managing method may further include: turning-off the charging switch, turning-on the first balancing switch, and turning-off a second balancing switch corresponding to the second cell till the first voltage becomes the first reference voltage if the first voltage reaches the maximum voltage and the second voltage is lower than the first reference voltage. The battery managing method may further include: turning-on the charging switch and turning-on the first balancing switch and the second balancing switch till the first voltage becomes the maximum voltage if the first voltage reaches the first reference voltage and the second voltage is lower than the first reference voltage. The battery managing method may further include: turning-on the charging switch and turning-off the first balancing switch and the second balancing switch till the first voltage becomes the maximum voltage if the first voltage reaches the first reference voltage and the second voltage is lower than the first reference voltage.

"The battery managing method may further include: receiving an information of the first voltage and an information of the second voltage.

BRIEF DESCRIPTION OF THE DRAWINGS

"FIG. 1 is a view of a battery management system 100 and a surrounding device of the battery management system 100 according to an exemplary embodiment of the present invention.

"FIG. 2 is a view of a battery management system 100' according to another exemplary embodiment of the present invention.

"FIG. 3 is a view of a method of performing cell balancing of a battery management system according to an exemplary embodiment of the present invention of a case (Ic.ltoreq.Ib) that a charging current (Ic) is equal to or less than a bleeding current (Ib).

"FIG. 4 is a view of a method of performing cell balancing of a battery management system according to an exemplary embodiment of the present invention of a case (Ic>Ib) that a charging current (Ic) is larger than a bleeding current (Ib).

"FIG. 5 is a view of a method of performing cell balancing of a battery management system according to an exemplary embodiment of the present invention of a case (Ic>Ib) that a charging current (Ic) is larger than a bleeding current (Ib).

"FIG. 6 is a view comparing a conventional cell balancing method with a cell balancing method according to FIG. 5."

For additional information on this patent application, see: CHEON, Eun; CHUNG, Jinhwa. Battery Management System and Managing Method Thereof. Filed December 5, 2013 and posted June 12, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=5206&p=105&f=G&l=50&d=PG01&S1=20140605.PD.&OS=PD/20140605&RS=PD/20140605

Keywords for this news article include: Electronics, Fairchild Korea Semiconductor Ltd..

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


For more stories covering the world of technology, please see HispanicBusiness' Tech Channel



Source: Electronics Newsweekly


Story Tools






HispanicBusiness.com Facebook Linkedin Twitter RSS Feed Email Alerts & Newsletters