A battery pack for an electric power tool has at least one cell arrangement with a plurality of individual battery cells that are arranged such in a predetermined total number of battery cells upright adjacent to one another for forming a cell container that cell axes of the battery cells are approx
A battery pack for an electric power tool has at least one cell arrangement with a plurality of individual battery cells that are arranged such in a predetermined total number of battery cells upright adjacent to one another for forming a cell container that cell axes of the battery cells are approximately perpendicular to a common reference plane. Cell connectors electrically conductingly connect cell ends of the battery cells. The battery cells of the cell container include a core cell and neighboring cells surrounding the core cell. Points of intersection of the cell axes of all of the neighboring cells with the reference plane are positioned on a closed, approximately elliptical curve. A number of neighboring cells is greater than one third of the total number of the battery cells of cell container.
대표청구항▼
1. A battery pack for an electric power tool, the battery pack comprising: at least one cell arrangement with a plurality of individual battery cells;an upper cell holder and a lower cell holder, wherein said battery cells are secured between the upper cell holder and the lower cell holder and where
1. A battery pack for an electric power tool, the battery pack comprising: at least one cell arrangement with a plurality of individual battery cells;an upper cell holder and a lower cell holder, wherein said battery cells are secured between the upper cell holder and the lower cell holder and wherein said battery cells, the upper cell holder and the lower cell holder together form a parallelepipedal cell container;the upper and lower cell holders each having a first longitudinal side, a second longitudinal side, and narrow sides;wherein a predetermined total number of said battery cells is arranged upright adjacent to one another for forming the cell container such that cell axes of said battery cells are approximately perpendicular to a common reference plane;cell connectors electrically conductingly connecting cell ends of said battery cells;wherein said battery cells of said cell container comprise a core cell and neighboring cells surrounding said core cell, wherein said neighboring cells each are radially spaced from said core cell so that said core cell and said neighboring cells do not contact each other, respectively, and an enlarged free radial space is provided around said core cell compared to an arrangement in which said neighboring cells are contacting said core cell;wherein said neighboring cells are radially spaced at different radial spacings relative to said core cell, respectively, so that points of intersection of said cell axes of all of said neighboring cells with said reference plane are positioned on a closed elliptical curve having a major axis and a minor axis, wherein the major axis is greater than the minor axis, wherein said core cell is positioned at a point of intersection of the minor axis and the major axis and wherein none of said neighboring cells is aligned with said core cell on the minor axis or the major axis;wherein said enlarged free radial space reduces a heat transmission from said neighboring cells surrounding said core cell onto said core cell, respectively;wherein the major axis extends approximately parallel to the first and second longitudinal sides of the cell holders and the minor axis extends approximately parallel to the narrow sides of the cell holders;wherein a number of said neighboring cells is greater than one third of said total number of said battery cells of said cell container;wherein said battery cells of said cell container comprise terminal cells that are arranged in two terminal rows opposite each other, wherein said neighboring cells are positioned between said two terminal rows of said terminal cells;wherein center points of said terminal cells in each of said two terminal rows are positioned on a straight line, respectively, wherein said straight line extends perpendicular to said major axis, respectively;wherein said core cell, said neighboring cells, and said terminal cells each have the same geometric shape and the same geometric dimensions. 2. The battery pack according to claim 1, wherein said number of said neighboring cells is greater than half of said total number of said battery cells. 3. The battery pack according to claim 1, wherein said total number of said battery cells is approximately nine to 19. 4. The battery pack according to claim 1, wherein said total number of said battery cells is 15. 5. The battery pack according to claim 1, wherein said number of said neighboring cells is eight. 6. The battery pack according to claim 1, wherein said terminal rows each comprise three of said terminal cells. 7. The battery pack according to claim 6, wherein said cell container has narrow sides and along said narrow sides said terminal rows are located, respectively, wherein said core cell is substantially centrally arranged within said cell container, wherein said neighboring cells are arranged in four two-cell groups about said core cell, wherein two of said two-cell groups are positioned on longitudinal sides of said cell container, respectively, and two of said two-cell groups are positioned between said terminal rows and said core cell, respectively. 8. The battery pack according to claim 7, wherein center points of said cell ends of said neighboring cells of said two-cell group are positioned on a straight line, respectively, wherein said straight line extends parallel to said longitudinal sides or said narrow side of said cell container, respectively. 9. The battery pack according to claim 1, wherein the upper and lower cell holders are provided with receptacles, wherein said cell ends each are positioned in one of said receptacles of the upper and lower cell holders, wherein said receptacles each have a circumferential rim that surrounds said cell end received in said receptacle by more than approximately 180°, wherein said cell ends are supported on a bottom of said receptacles, and wherein said bottom of said receptacles has a cutout, wherein said cutouts of adjacently positioned one of said receptacles define an insertion space for one of said cell connectors that extends across said circumferential rim of said receptacles and that is secured to said cell ends in said adjacently positioned ones of said receptacles, wherein the upper and lower cell holders, after securing said cell connector to said cell ends, are positively mechanically secured between said cell connector and said battery cells. 10. The battery pack according to claim 9, wherein said cell connector is mechanically secured in said insertion space. 11. The battery pack according to claim 10, wherein said cell connector is captively secured in said insertion space. 12. The battery pack according to claim 9, wherein the upper and lower cell holders each have a centering head and said cell connector has an opening that is engaged by the centering head of said cell holder. 13. The battery pack according to claim 9, wherein said cell connector is secured precisely between edges of said insertion space. 14. The battery pack according to claim 9, wherein said first and second longitudinal sides of the upper and lower cell holders are parallel to each other and are each provided with a guide section, wherein said guide section of said first longitudinal side is displaced by a spacing in the longitudinal direction relative to said guide section of said second longitudinal side, respectively. 15. The battery pack according to claim 14, wherein said guide sections are located between two of said battery cells in a plan view onto said cell ends. 16. The battery pack according to claim 14, wherein said guide sections each have an edge provided with a springy tab having a free end that is positioned approximately within a plane of said first and second longitudinal sides, respectively. 17. The battery pack according to claim 9, wherein said cell holders have a receiving pocket in which a sensor is arranged. 18. The battery pack according to claim 17, wherein said sensor is a temperature sensor. 19. The battery pack according to claim 1, wherein one of said cell connectors is a dual connector that provides an electrical connection between two said cell containers. 20. The battery pack according to claim 19, wherein said dual connector connects said cell ends of said battery cells of a first one of said two cell containers with said cell ends of said battery cells of a second one of said two cell containers. 21. The battery pack according to claim 1, wherein said battery cells of said cell container are arranged symmetrically relative to a longitudinal center axis of said cell container. 22. A battery pack for an electric power tool, the battery pack comprising: at least one cell arrangement with a plurality of individual battery cells;an upper cell holder and a lower cell holder, wherein said battery cells are secured between the upper cell holder and the lower cell holder and wherein said battery cells, the upper cell holder and the lower cell holder together form a parallelepipedal cell container;the upper and lower cell holders each having a first longitudinal side, a second longitudinal side, and narrow sides;wherein a predetermined total number of said battery cells is arranged upright adjacent to one another for forming the cell container such that cell axes of said battery cells are approximately perpendicular to a common reference plane;cell connectors electrically conductingly connecting cell ends of said battery cells;wherein said battery cells of said cell container each have the same geometric shape and the same geometric dimensions;wherein said battery cells comprise a core cell and neighboring cells surrounding said core cell, wherein said neighboring cells are radially spaced from said core cell by a radial spacing measured between said cell axis of said core cell and said cell axis of said neighboring cells, respectively;wherein points of intersection of said cell axes of all of said neighboring cells with said reference plane are positioned on a closed elliptical curve having a major axis and a minor axis, wherein the major axis is greater than the minor axis;wherein said radial spacing amounts to at least a value of the square root of [(0.5 D)2+D2] and provides a free radial space between said core cell and said neighboring cells, respectively, wherein D is the diameter of said core cell and of said neighboring cells, respectively;wherein said free radial space reduces a heat transmission from said neighboring cells surrounding said core cell onto said core cell, respectively;wherein the major axis extends approximately parallel to the first and second longitudinal sides of the cell holders and the minor axis extends approximately parallel to the narrow sides of the cell holders;wherein a number of said neighboring cells is greater than one third of said total number of said battery cells of said cell container;wherein said battery cells of said cell container comprise terminal cells that are arranged in two terminal rows opposite each other, wherein said neighboring cells are positioned between said two terminal rows of said terminal cells.
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이 특허에 인용된 특허 (6)
Walker Thomas P. ; Juergens Tristan E., Battery case.
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