Battery pack arrangements

• US 20050260488A1
• Filed: 05/24/2004
• Published: 11/24/2005
• Est. Priority Date: 05/24/2004
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations Incorporated (General Motors Company)
• Inventors: Husted, Clinton Chandler, Zhou, Shijian, Benjamin, Frances A.
• Granted Patent: US 7,507,499 B2
• Time in Patent Office: Days
• US Class Current: 429/99
• CPC Class Codes: B60R 16/04 Arrangement of batteries
• CPC Class Codes: H01M 50/209 adapted for prismatic or rectangular cells H01M50/216 takes precedence
• CPC Class Codes: H01M 50/227 Organic material
• CPC Class Codes: H01M 50/264 for cells or batteries, e.g. straps, tie rods or peripheral frames
• CPC Class Codes: H01M 50/289 characterised by spacing elements or positioning means within frames, racks or packs spacing elements inside cells other than separators, membranes or diaphragms H01M50/471
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

Battery packs are retained by frames which are comprised of plastic beams and aluminum corner connectors that peripherally surround the battery packs. The plastic beams are tension by tensioning bolts which pass through the aluminum corner connectors and thread into threaded pin inserts laterally seated in the beams. As the tensioning bolts are advanced into the inserts the beams are axially tensioned. Damping pads are disposed between the separate battery modules of the battery packs, as well as at the corners of the frames, to both absorb vibrational and spike impacts. The damping pads frictionally engage the outer surfaces of the battery cases so that the batteries will not move in the Z-axis direction, thus minimizing the risk that battery interconnections will be damaged. The frames rest on a supporting surface, such as the surfaces of a battery pack tray. The bottoms of the battery modules are spaced from the tray so that the battery packs are vertically supported by the frames only around the peripheries of the battery packs.

Claims

1. An arrangement for stabilizing in an electric or hybrid electric vehicle at least one rectangular battery pack, wherein the battery pack includes an array of separate battery modules and has four side surfaces, a bottom surface and a top surface, the arrangement comprising:

a rectangular frame having four beams, each beam engaging one of the four sides of the battery pack at a location adjacent to the bottom surface of the battery pack;

four corner connectors disposed at ends of each beam to couple at right angles one beam to another; and

tensioners for positively connecting each corner connector to two beams and for drawing the beams toward the corner connectors to clamp the battery modules in the battery pack against one another.

2. The arrangement of claim 1 wherein there are damping pads positioned between the battery modules comprising the battery pack.

3. The arrangement of claim 2 wherein the frame of the battery pack extends beneath the bottom surface of the battery pack to support the battery pack on a supporting surface adjacent to the periphery of the battery pack.

4. The arrangement of claim 2 wherein the corner connectors are unitary bodies each having a first pair of holes opening in directions normal to one another and the tensioners are threaded fasteners received through the openings;

and

threaded axial holes in the beams threadably receive the threaded fasteners to draw the beams toward the corner connectors as the threaded fasteners are rotated.

5. The arrangement of claim 4 wherein the threaded fasteners are threaded bolts and wherein the threaded axial holes are in anchors disposed in the beams.

6. The arrangement of claim 5 wherein the anchors are pins inserted laterally into the beams.

7. The arrangement of claim 6 wherein the pins are retained in the bores with spring stops.

8. The arrangement of claim 2 wherein the beams are made of plastic and the corner connectors are made of metal.

9. The arrangement of claim 8 wherein the corner connectors are unitary bodies each having a first pair of holes opening in directions normal to one another and the tensioners are threaded fasteners received through the openings;

and

threaded axial holes in the beams threadably receive the threaded fasteners to draw the beams toward the corner connectors as the threaded fasteners are rotated.

10. The arrangement of claim 9 wherein the threaded fasteners are threaded bolts and wherein the threaded axial holes are in anchors disposed in the beams.

11. The arrangement of claim 10 wherein the anchors are pins inserted into the beams.

12. The arrangement of claim 11 wherein the pins are retained in the bores with spring stops.

13. The arrangement of claim 12 wherein the supporting surface is a battery tray and wherein the beams have bottom surfaces spaced from the bottom of the module and facing the tray to support the frame and thus the battery pack on the tray.

14. The arrangement of claim 13 wherein fasteners couple the frame on the tray.

15. The arrangement of claim 14 wherein the fasteners extend through the beams to couple the frame to the tray.

16. The arrangement of claim 15 wherein the tray is plastic.

17. The arrangement of claim 16 wherein the tray and battery pack are covered by a plastic cover.

18. The arrangement of claim 3 wherein the supporting surface is a battery tray and wherein the beams have bottom surfaces facing the tray to support the frame and the battery pack on the tray.

19. The arrangement of claim 18 wherein there are plural battery packs mounted on a single tray.

20. The arrangement of claim 19 wherein a middle battery pack is disposed between outer battery packs, the middle battery pack having a first pair of parallel beams positioned on parallel beams of each of the two adjacent outer battery packs, the middle battery pack being engaged by a second pair of parallel beams extending perpendicular to the first pair of parallel beams.

21. The arrangement of claim 20 wherein fasteners extend through both the first pair of beams engaging the middle battery pack and the parallel beams of the outer battery packs to secure the middle and outer battery packs to the tray.