Method of handling large format battery cells for high speed assembly
View Patent ↗A battery pack assembly and a method of making the same. The method includes using lifters with a cammed conveyor delivery mechanism to facilitate edgewise stacking of generally planar battery cells. The lifter spacing and cam profile are designed in such a way as to orient individual battery cell tabs and cooling fin assemblies to keep them close together but without applying significant forces to the stackable components. Combining conveyor streams allows components to be processed in parallel and sequenced correctly onto a single conveyor. Use of lifter integrated conveyor belt with cams and guides for individual battery cell orientation and sequencing promotes high speed assembly without a need to change component directions. The use of high-speed component delivery high is compatible with allowing more component placement variation, while the edgewise orientation of the components being assembled permits the use of small manufacturing footprints.
1. A method of assembling battery pack components, said method comprising:
combining a substantially planar battery cell and a substantially planar cooling fin such that facingly adjacent contact is established therebetween;
conveying said cell and fin combination from an orientation wherein said facingly adjacent contact is in a substantially horizontal plane to an orientation wherein said facingly adjacent contact is in a substantially vertical plane;
aligning a plurality of said substantially vertical cell and fin combinations between a plurality of end plates along an axis that is formed substantially normal to a planar dimension defined by said facingly-adjacent contact to define a stack thereby;
compressing said stack along said substantially normal axis;
enclosing at least a portion of said stack in a support structure; and
connecting said stack to an electric circuit to form an assembled battery pack.
2. The method of claim 1 , wherein said conveying comprises:
conveying a first plurality of said substantially vertical cell and fin combinations oriented with electrical tabs in a first position along a first conveyor;
conveying a second plurality of said substantially vertical cell and fin combinations oriented with electrical tabs in a second position along a second conveyor; and
using at least one substantially stationary guide to alternating intermingle said first and second plurality of said substantially vertical cell and fin combinations.
3. The method of claim 2 , wherein said conveying said first and second plurality of said substantially vertical cell and fin combinations comprises conveying them along a plurality of substantially parallel conveyor belts at least until contact between said guides and said first and second plurality of said substantially vertical cell and fin combinations is established.
4. The method of claim 3 , further comprising rotating said stack about a substantially horizontal axis prior to said compressing.
5. The method of claim 3 , wherein said compressing is done to a predetermined force and distance.
6. The method of claim 3 , wherein said conveying is performed on at least one conveyor belt.
7. The method of claim 6 , wherein a portion of said at least one conveyor belt used to change said cell and fin combinations from a substantially horizontal orientation to a substantially vertical orientation cooperates with a cammed structure and a plurality of lifters spaced along an elongate dimension of said at least one conveyor belt and movably responsive to said cammed structure such that a portion of at least one of said plurality of lifters contacts said cell and fin combinations to effect a change in orientation thereof.
8. The method of claim 1 , wherein said enclosing at least a portion of said stack in a support structure comprises connecting said stack to a frame and connecting at least one of said frame and said stack to a cover.
9. The method of claim 8 , further comprising conducting at least one of quality control testing and electrical testing on said assembled module.