US 8,940,427 B2Granted

Rechargeable battery pack

AssigneeMakita Corporation

InventorsMasafumi Noda, Hitoshi Suzuki, Hisakazu Okabayashi

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Abstract

A rechargeable battery pack attachable to a power tool includes a display element, a remaining capacity detection device, a remaining capacity display control device, an abnormality detection device, and an abnormality display control device. The display element is provided such that a lighted state thereof can be confirmed from outside. The remaining capacity detection device detects a remaining capacity of a rechargeable battery. The remaining capacity display control device displays the remaining capacity detected by the remaining capacity detection device by controlling the lighted state of the display element. The abnormality detection device detects an abnormality of the rechargeable battery. The abnormality display control device displays the abnormality of the rechargeable battery detected by the abnormality detection device by controlling the lighted state of the display element to an abnormality display state, which is different from a remaining capacity display state controlled by the remaining capacity display control device.

Claims8

Dependent claims

A rechargeable battery pack attachable to a power tool, the rechargeable battery pack comprising:

a rechargeable battery;
a display element provided in such a manner that a lighted state thereof can be confirmed from outside;
a remaining capacity detection device that detects a remaining capacity of the rechargeable battery;
a remaining capacity display control device that displays the remaining capacity detected by the remaining capacity detection device by controlling the lighted state of the display element;
an abnormality detection device that detects an abnormality of the rechargeable battery;
a determination device that determines whether or not an operation switch of the power tool has been operated when the rechargeable batter sack is attached to the power tool;
and
an abnormality display control device that displays the abnormality of the rechargeable battery, even when the determination device determines that the operation switch of the power tool has been operated, detected by the abnormality detection device by controlling the lighted state of the display element to an abnormality display state, which is different from a remaining capacity display state controlled by the remaining capacity display control device.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/277,469Filed 20 Oct 2011
Priority: JP 2010-24004326 Oct 2010
Published: US 2012/0100405 A126 Apr 2012
Granted: 27 Jan 2015
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

H01M 10/4207
Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells: for several batteries or cells simultaneously or…
H01M 10/4257
Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing: smart batteries, e.g.…
H01M 10/488
Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte:…
H01M 50/213
Characterised by their shape: adapted for cells having curved cross-section, e.g. round or elliptic