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A connector assembly for electrically connecting poles of two adjacent battery cell. The connector assembly comprises an electrically conductive bus bar having a first connection area and a second connection area distal from each other, electrically conductive pole-mating components having a pole-ma

A connector assembly for electrically connecting poles of two adjacent battery cell. The connector assembly comprises an electrically conductive bus bar having a first connection area and a second connection area distal from each other, electrically conductive pole-mating components having a pole-mating face and a bar-mating face, and fastening components for attaching the electrically conductive bus bar and one of the pole-mating components to one of the poles of the two adjacent battery cells. The pole-mating faces of the pole-mating components are adapted for mating the poles the battery cells. The bar-mating faces of the pole-mating components are adapted for mating with the connection areas. The bar-mating faces and the connection areas have complementary concave/convex arched shape for optimizing contact surface over a range of relative positioning of the two adjacent battery cells.

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1. A connector assembly for electrically connecting poles of two adjacent battery cells, the connector assembly comprising: an electrically conductive bus bar having a first connection area and a second connection area distal from each other;electrically conductive pole-mating components having a po

1. A connector assembly for electrically connecting poles of two adjacent battery cells, the connector assembly comprising: an electrically conductive bus bar having a first connection area and a second connection area distal from each other;electrically conductive pole-mating components having a pole-mating face and a bar-mating face, the pole-mating face adapted for mating with one of the poles of one of the two adjacent battery cells, and the bar-mating face for mating with one of the first connection area and the second connection area; andfastening components each for attaching the electrically conductive bus bar and one of the pole-mating components to one of the poles of the two adjacent battery cells, wherein the bar-mating face and the first and the second connection areas have complementary concave/convex arched shapes for optimizing a contact surface over a range of relative positioning of the two adjacent battery cells. 2. The connector assembly of claim 1, wherein the first connection area and the second connection area have a concave surface and the bar-mating face has a convex surface. 3. The connector assembly of claim 2, wherein the concave surface has a diameter which is greater than a diameter of the convex surface. 4. The connector assembly of claim 1, wherein the fastening components comprise a bolt passing through the electrically conductive bus bar and one of the pole-mating components to attach to one of the poles. 5. The connector assembly of claim 1, wherein the fastening components comprise a resilient member maintaining a pressure over the electrically conductive bus bar over the range of relative positioning of the two adjacent battery cells. 6. The connector assembly of claim 1, wherein at least one of the electrically conductive bus bar and the pole-mating components is made of a single material. 7. The connector assembly of claim 1, wherein a radius of curvature of the bar-mating face is about between 5 mm to 50 mm. 8. The connector assembly of claim 1, wherein a ratio of a distance between a center of having the first connection area and a center of the second connection area to a radius of curvature the first connection area or a radius of curvature of the second connection area is about between seven (7) and fifteen (15). 9. The connector assembly of claim 1, wherein the pole-mating components comprise a hole of a first minimum diameter and the electrically conductive bus bar comprises holes of a second maximum diameter greater than the first minimum diameter. 10. The connector assembly of claim 1, wherein the electrically conductive bus bar comprises a body, wherein the body is straight between the first connection area and a second connection area. 11. An electrically conductive bus bar for electrically connecting poles of two adjacent battery cells wherein the poles each have a mating face of a spheroid shape, the electrically conductive bus bar comprising: a top face and a bottom face opposed to the top face, wherein the bottom face comprises: a first connection area having a spheroid shape;a second connection area having a spheroid shape distal from each other; andholes passing through the bus bar about the first connection area and the second connection area, each hole being for passage of a fastening component attaching the electrically conductive bus bar to one of the poles of the two adjacent battery cells with the top face comprising an area about each of the holes for the fastening component to press against the bus bar towards the pole;and a body electrically connecting the first connection area to the second connection area, wherein the spheroid shapes of the first connection area and of the second connection area are complementary to the spheroid shapes of the mating faces of the poles of the two adjacent battery cells for optimizing contact surface over a range of relative positioning of the two adjacent battery cells. 12. The electrically conductive bus bar of claim 11, wherein the electrical conductive bus bar is made of a single material. 13. The electrically conductive bus bar of claim 11, wherein the holes passing have a first diameter and the fastening components have a second diameter, and wherein the first diameter is greater than the second diameter. 14. The electrically conductive bus bar of claim 11, wherein the body defines a straight line between the first connection area and the second connection area. 15. The electrically conductive bus bar of claim 11, wherein a ratio of a distance between a center of having the first connection area and a center of the second connection area to a radius of curvature the first connection area or a radius of curvature of the second connection area is about between seven (7) and fifteen (15). 16. A connector assembly for electrically connecting a pole of a first battery cell to an electrically conductive bus bar connected to a pole of an adjacent battery cell, the connector assembly comprising: an electrically conductive pole-mating component comprising a pole-mating face for mating with the pole of the first battery cell and a first adaptive-mating face; andan electrically conductive bar-mating component comprising a bar-mating face for mating with the electrically conductive bus bar and a second adaptive-mating face; and wherein the first adaptive-mating face and the second adaptive-mating face have complementary concave/convex arched shapes for mating with each other and optimizing a contact surface over a range of positioning of the adjacent battery cell relative to the first battery cell. 17. The connector assembly of claim 16, wherein the pole-mating component and the bar-mating component are made of the same material. 18. The connector assembly of claim 16, wherein the pole-mating component and the bar-mating component comprise a hole passing therethrough. 19. The connector assembly of claim 16, wherein the pole-mating component and the bar-mating component contacting through their adaptive-mating faces define together a cylindrical shape.