Battery pack
AssigneeMakita Corporation
InventorEiji KONDO
Life of this patent
Estimating the term…
Abstract
As a cooling draft flows from a rear side to a front side of battery cells (72) inside a battery pack (30), it is divided into two cooling drafts (F1, F2) in a left-right direction, which is the direction that the battery cells (72) are disposed in parallel, and those two cooling drafts respectively flow through a plurality of passageways that longitudinally extend along the battery cells (72). More particularly, a second battery cell (722) is cooled by the cooling draft flowing in a second ventilation-path volume (Q2) before a first battery cell (721) and a third battery cell (723) are cooled by cooling drafts respectively flowing in a first ventilation-path volume (Q1) and a third ventilation-path volume (Q3), which are longer than the second ventilation-path volume (Q2).
Claims19
A battery pack that is mountable on a power tool and on a charger, comprising:
- a case constituting an outer shell;
- a plurality of columnar battery cells, each having a longitudinal direction, the battery cells being disposed in an interior of the case such that the battery cells are aligned and the longitudinal directions thereof are disposed in parallel;
- and
- a first ventilation hole and second ventilation holes, each of which are formed such that they permit fluid communication between the interior and an exterior of the case;
- wherein:
- a ventilation path is defined in the interior of the case such that the first ventilation hole serves as an inlet thereof and the second ventilation holes serve as outlets thereof;
- a plurality of longitudinal-direction passageways, wherethrough a plurality of cooling drafts respectively flow along the longitudinal directions of the battery cells, is provided in the ventilation path, each longitudinal-direction passageway being arranged in the direction that the battery cells are disposed in parallel;
- and
- a longitudinal extension of each of the longitudinal-direction passageways extends in parallel to the longitudinal directions of the battery cells.
Dependencies are inferred from the claim text.