Battery pack for cordless device

Details Battery pack for cordless device Battery pack for cordless device

H - Electricity

01

M

H01M 2/10 (2006.01) H01M 2/20 (2006.01) H01M 2/30 (2006.01) H01M 6/44 (2006.01)

Patent

CA 2160028

A battery pack (13) comprises an elongated cylindrical, metal casing (35), a plurality of cells (41, 43) in casing (35) and three coaxial pack terminals (46, 54, 61). For enhanced convenience, pack terminals (46, 54, 61) are electrically connectable in a cordless device (11) regardless of the angular orientation of the pack (13) about casing axis (33). To reduce cost and increase durability, pack (13) has no welded connections and will permit high current discharge rates. Cells (41, 43) are electrically connected but are mechanically disconnected. A spring (73) engages cell (41) and biases cells (41, 43) tightly together in compression to form good, low resistance electrical contact between cells (41, 43), casing base cap (45) and top (53). To provide a pack with two output voltages, the third pack terminal (61) has a polarity, relative to first pack terminal (46), the same as second pack terminal (54) and is electrically connected to the cell can terminal (43b) of forward cell (43), thereby electrically by-passing cell (43).

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