Patent Application Titled "Charge/Discharge Control Circuit and Battery Device" Published Online (USPTO 20180183246)

Politics & Government Week |

By a News Reporter-Staff News Editor at Politics & Government Week -- According to news reporting originating from Washington, D.C., by VerticalNews journalists, a patent application by the inventors SAKURAI, Atsushi (Chiba-shi, JP); ONO, Takashi (Chiba-shi, JP); YASUDA, Kazuhide (Chiba-shi, JP), filed on , was made available online on .

No assignee for this patent application has been made.

Reporters obtained the following quote from the background information supplied by the inventors: "The present invention relates to a charge/discharge control circuit and a battery device.

"Hitherto, there has been known a battery device that includes a charge/discharge control circuit (or a battery state monitoring circuit) having a controller (or a control circuit), and a plurality of secondary batteries. The battery device described, for example, in Japanese Patent Application Laid-open No. 2009-159811 uses the controller of the charge/discharge control circuit to control a charge/discharge current of the plurality of secondary batteries connected in series.

"In the battery device described in Japanese Patent Application Laid-open No. 2009-159811, the plurality of secondary batteries are connected in series. However, parallel connection of the plurality of secondary batteries can be instead thought of.

"In the battery device described in Japanese Patent Application Laid-open No. 2009-159811, the controller of the charge/discharge control circuit operates on a charge/discharge current of the secondary batteries. The controller of the charge/discharge control circuit may, however, lose the control of charging/discharging when an abnormality such as fall-off or an internal open-circuit failure of a secondary battery takes place in one of the plurality of secondary batteries because the plurality of secondary batteries are connected in series.

"In the battery device described in Japanese Patent Application Laid-open No. 2009-159811, an abnormality in one of the secondary batteries cuts off the connection between the rest of the secondary batteries and an external terminal (output terminal). The loss of charge/discharge control by the controller of the charge/discharge control circuit therefore does not particularly cause a problem.

"In the case of parallel connection of the plurality of secondary batteries, however, an abnormality in one of the secondary batteries does not lead to the cutting off of the connection between the rest of the secondary batteries and an external terminal (output terminal). The loss of charge/discharge control by the controller of the charge/discharge control circuit in the case of parallel connection of the plurality of secondary batteries may accordingly render the battery device unstable when an abnormality occurs in one of the plurality of secondary batteries."

In addition to obtaining background information on this patent application, VerticalNews editors also obtained the inventors' summary information for this patent application: "It is an object of the present invention to provide a charge/discharge control circuit and a battery device in which a controller is capable of controlling a charge/discharge current despite an abnormality in one of a plurality of secondary batteries connected in parallel.

"According to one embodiment of the present invention, there is provided a charge/discharge control circuit comprising: a first power supply terminal to which a first electrode of a first secondary battery is connected; a second power supply terminal to which a first electrode of a second secondary battery is connected, the second secondary battery being connected in parallel to the first secondary battery; a third power supply terminal to which second electrodes of the first secondary battery and the second secondary battery are connected; a connection circuit configured to connect the first power supply terminal and the second power supply terminal, and to output an electric potential that is generated after the connection; and a controller configured to operate on a power supply voltage that is a potential difference between the electric potential output from the connection circuit and an electric potential supplied from the third power supply terminal, and to control charging/discharging of the first secondary battery and the second secondary battery.

"According to the charge/discharge control circuit of the present invention, the controller is capable of controlling a charge/discharge current despite an abnormality in one of the plurality of secondary batteries connected in parallel sine the connection circuit is included between the controller and the power supply terminals."

For more information, see this patent application: SAKURAI, Atsushi; ONO, Takashi; YASUDA, Kazuhide. Charge/Discharge Control Circuit and Battery Device. Filed and posted . Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220180183246%22.PGNR.&OS=DN/20180183246&RS=DN/20180183246

Keywords for this news article include: Patent Application.

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