Power source battery storing structure in motor-assisted bicycle

摘要

To provide a compact power source battery storing structure in a motor-assisted bicycle using motive power of a motor to be driven by cylindrical batteries, for assisting man power propelling the bicycle.;Ten Ni-Cd batteries (28a) are arranged in a row in a direction perpendicular to a center line of each Ni-Cd battery (28a) in such a condition that the positive electrodes and the negative electrodes of the adjacent Ni-Cd batteries (28a) are alternately pointed and the cylindrical surfaces of the adjacent Ni-Cd batteries (28a) are in contact with each other. On the row of the Ni-Cd batteries (28a), the other ten Ni-Cd batteries (28b) are stacked in such a manner that each Ni-Cd battery (28b) is partially received in an upper recess defined between the adjacent Ni-Cd batteries (28a). In this stacked condition, the positive electrodes and the negative electrodes of the adjacent Ni-Cd batteries (28a) forming the lower row are electrically and mechanically connected together by soldering through a plurality of connecting members (30a). Similarly, the positive electrodes and the negative electrodes of the adjacent Ni-Cd batteries (28b) forming the upper row are connected together through a plurality of connecting members (30b). In particular, the positive electrode of the frontmost Ni-Cd battery (28a) (the leftmost one as viewed in Fig. 2) of the lower row and the negative electrode of the frontmost Ni-Cd battery (28b) (the leftmost one as viewed in Fig. 2) of the upper row are connected together through a connecting member (30c). Such an assembly of the Ni-Cd batteries (28a and 28b) is inserted into a hollow cylindrical heat-shrinkable synthetic resin film (31), and heat is applied to the film (31) to thereby thermally shrink the film (31).