Makita Corporation

Hidekazu Hayashi

Hideyuki Taga

Kazutoshi Ogino

Hironori Ogura

Eiji Kondo

Hitoshi Suzuki

Tsuyoshi Murayama

Masafumi Noda

Hiroki Uesugi

A battery pack includes a battery cell case, a plurality of battery cells accommodated in the battery cell case, a plurality of lead plates connected to the battery cells, arranged on a same side surface of the battery cell case, and arranged to be separated from each other, and one or more insulation sheets. A first insulation sheet included in the one or more insulation sheets is adhered to a surface of a first lead plate so as to cover the first lead plate at least partially and not to cover lead plates other than the first lead plate.

Battery pack

A battery pack may include a drainage device provided at a bottom portion of the housing case. The drainage device may include a drain hole communicating between the inside and the outside of the housing case, so that water introduced into the housing case is discharged to the outside of the housing case. The drainage device may be disposed between two of the terminal members that are connected to electrodes of the battery cells.

A battery housing of a tool battery has a hook accommodation chamber and a battery cell accommodation chamber defined therein. A hook is accommodated within the hook accommodation chamber and is operable to lock and unlock the tool battery against a tool body of a power tool. Battery cells are disposed within the battery cell accommodation chamber. The hook accommodation chamber and the battery cell accommodation chamber are partitioned from each other.

Tool batteries

One aspect according to the present invention includes a battery pack and a shock absorbing device interposed between a battery cell holder and a case body and capable of keeping the battery cell holder and the battery cells not to directly contact with an inner surface of the case body.

Battery pack including a shock absorbing device and arrangement of circuit boards

A tool battery pack can include a current detection element for detecting a discharge current or a charge current, a monitoring section for inputting a current signal of the discharge current or the charge current through the current detection element and for inputting voltage signals of each cell battery, and a control microcomputer for performing discharge control or charge control based on the signals from the monitoring section. Further, the tool battery pack is constructed such that the current signal through the current detection element is input to both the monitoring section and the control microcomputer.

Growing community of inventors

Anjo, Japan

Hidekazu Hayashi