Patent ID: 9184430
Filing Date: 2015-11-10
Classification: H01M,Y02E,Y02P

Abstract:
1. A battery pack comprising: a first non-conductive positioning plate having a length, width and thickness, a first number of cylindrical counter-bores, in a first surface of the positioning plate, the counter-bores having center-lines at right angles to the first surface, arranged in a pattern and of a first diameter to engage one end of each of a plurality of batteries, the counter-bores each having a first depth less than one-half the length of an engaged battery and less than the thickness of the positioning plate, a second number of recesses of a specific common shape and a second depth in an opposite second surface of the positioning plate from the first surface, each recess aligned on the centerlines of the counter bores, and round holes of a common second diameter on the centerlines through from each of the counter-bores in the first surface to the recesses in the second surface, the second diameter of the round holes less than the first diameter of the counter-bores, each round hole opening fully within the shape of the recesses in the second surface; a second non-conductive positioning plate a mirror-image of the first positioning plate; a first printed circuit board (PCB) having a length and width equal to that of the first positioning plate and a first flat surface with a pattern of raised conductive contact pads having the shape of the recesses in the second surface and a height equal to or less than the depth of the recesses, the raised contact pads matching the positions of the recesses on the second surface of the first positioning plate; a second printed circuit board (PCB) a mirror image of the first printed circuit board; and a plurality of coil springs equal to twice the number of the plurality of batteries, each coil spring having an outside diameter less than the diameter of the round holes, and a common length when not compressed; wherein the first and second positioning plates engage the plurality of batteries at opposite ends with the positioning plates fastened together to form a battery pack, the first and second printed circuit boards are joined to the outside surfaces of the positioning plates with the raised conductive contact pads engaged in the recesses in the surfaces of the positioning plates, and wherein the coil springs are constrained in the round holes, one end of each coil spring contacting a battery terminal and the opposite end of each coil spring contacting a raised conductive contact pad on one of the printed circuit boards, providing electrical contact between the raised conductive contact pads of the printed circuit boards and terminals of the plurality of batteries, such that each battery in the battery pack is constrained between two partially compressed coil springs.