Battery pack for cordless device
First Claim
1. A battery pack comprising:
- a casing having a longitudinal axis and having opposed rear and forward ends;
a plurality of cells in the casing, each cell having first and second cell terminals; and
first and second pack terminals having opposite polarities, coaxial with the casing axis, located adjacent to the casing forward end and electrically connectable in a cordless device regardless of the angular orientation of the pack about the casing axis.
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Accused Products
Abstract
A battery pack 13 (FIG. 2) 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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Citations
15 Claims
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1. A battery pack comprising:
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a casing having a longitudinal axis and having opposed rear and forward ends; a plurality of cells in the casing, each cell having first and second cell terminals; and first and second pack terminals having opposite polarities, coaxial with the casing axis, located adjacent to the casing forward end and electrically connectable in a cordless device regardless of the angular orientation of the pack about the casing axis. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A cordless device comprising:
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a cavity; a receptacle in the cavity; a battery pack removably located in the cavity and comprising a casing and a plurality of cells in the casing, said casing having a longitudinal axis and having opposed rear and forward ends, each cell having first and second cell terminals; and terminal means for electrically connecting the pack and receptacle together regardless of the angular orientation, relative to the receptacle, of the pack about the casing axis. - View Dependent Claims (9, 10, 11, 13)
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12. A cordless device comprising:
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a cavity; a receptacle disposed in the cavity, said receptacle having a housing defining a receptacle cavity, the receptacle cavity having a longitudinal axis; a first receptacle terminal disposed within the receptacle cavity; a second receptacle terminal disposed within the receptacle cavity; and a battery pack removably located in the cavity, said battery pack including an elongated cylindrical casing having a longitudinal axis of symmetry coaxial to the longitudinal axis of the receptacle cavity and opposed rear and forward ends, a plurality of cells disposed in the casing, and first and second pack terminals, each said cell having first and second cell terminals;
wherein,said first receptacle terminal mates with the first pack terminal and said second receptacle terminal mates with the second pack terminal, the pack terminals are coaxial with the casing axis, and the pack terminals are located adjacent to the casing forward end and are electrically connectable to the receptacle terminals regardless of the angular orientation of the battery pack about the casing axis.
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14. A cordless device comprising:
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a longitudinally extending cavity; a receptacle disposed in the cavity, said receptacle having a housing defining a receptacle cavity, the receptacle cavity having a longitudinal axis; a first receptacle terminal disposed within the receptacle cavity; a second receptacle terminal disposed within the receptacle cavity;
wherein,a battery pack having front and rear ends and first and second pack terminals disposed adjacent the front end is slidably locatable in the receptacle cavity with the longitudinal axis of the battery pack coaxial to the longitudinal axis of the receptacle cavity and with the first receptacle terminal matable with the first pack terminal and the second receptacle terminal matable with the second pack terminal in any angular orientation of the pack about the coaxial longitudinal axes. - View Dependent Claims (15)
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Specification