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A battery pack includes a plurality of battery cells each having positive and negative cell terminals and a carrier mounted over and spanning across the plurality of battery cells. The carrier has trays with openings therethrough exposing the positive and negative cell terminals. A plurality of buss

A battery pack includes a plurality of battery cells each having positive and negative cell terminals and a carrier mounted over and spanning across the plurality of battery cells. The carrier has trays with openings therethrough exposing the positive and negative cell terminals. A plurality of buss bars are received in corresponding trays. The buss bars each have a positive plate laser welded to the positive cell terminal of a corresponding battery cell through the corresponding opening and a negative plate laser welded to the negative cell terminal of a different battery cell through the corresponding opening. The buss bars may be bimetal buss bars.

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1. A battery pack comprising: a plurality of battery cells each having positive and negative cell terminals;a carrier being mounted over and spanning longitudinally across the plurality of battery cells, the carrier having trays with openings therethrough exposing the positive and negative cell term

1. A battery pack comprising: a plurality of battery cells each having positive and negative cell terminals;a carrier being mounted over and spanning longitudinally across the plurality of battery cells, the carrier having trays with openings therethrough exposing the positive and negative cell terminals; anda plurality of buss bars received in corresponding trays, the buss bars each having a positive plate laser welded to the positive cell terminal of a corresponding battery cell through the corresponding opening and a negative plate laser welded to the negative cell terminal of a different battery cell through the corresponding opening;wherein the carrier comprises U-shaped flexible hinges between adjacent trays, the U-shaped flexible hinges allowing relative longitudinal movement between the trays and corresponding buss bars held by the trays. 2. The battery pack of claim 1, wherein the trays have pockets receiving corresponding buss bars, the trays having tabs extending into the pockets to secure the buss bars in the pockets. 3. The battery pack of claim 1, wherein the buss bars are loaded in the carrier prior to mounting the carrier to the battery cells. 4. The battery pack of claim 1, wherein the buss bars are bimetal buss bars. 5. The battery pack of claim 1, wherein the flexible hinges allow spreading apart of the trays and corresponding buss bars held by the trays. 6. The battery pack of claim 1, wherein the carrier holds a voltage sensing wire harness having a plurality of voltage sensing wires, the voltage sensing wires being terminated to corresponding buss bar to sense a voltage of the buss bars. 7. The battery pack of claim 1, wherein each buss bar comprises a voltage sensing contact extending therefrom, the voltage sensing contact being terminated to voltage sensing wires held by the carrier. 8. The battery pack of claim 1, further comprising a positive battery terminal received in the carrier and terminated to a corresponding positive cell terminal and a negative battery terminal received in the carrier and terminated to a corresponding negative cell terminal, the positive and negative battery terminals each having quick connection ends, the battery pack further comprising a module to module terminal connected to the quick connection ends of the positive and negative battery terminals to electrically connect the positive and negative battery terminals. 9. The battery pack of claim 1, further comprising a positive battery terminal received in the carrier and laser welded to a corresponding positive cell terminal, the battery terminal having a quick connection end for electrical connection to a power terminal. 10. The battery pack of claim 1, further comprising a cover covering the trays and the buss bars. 11. The battery pack of claim 1, wherein the positive plate is configured to be terminated to a flat pad of the positive cell terminal and the negative plate is configured to be terminated to a flat pad of the negative cell terminal. 12. The battery pack of claim 4, wherein at least one of the positive plate and the negative plate includes a bridge spanning over at least a portion of the other of the positive plate and the negative plate, the bridge defining a bimetal interface between the positive plate and the negative plate. 13. The battery pack of claim 7, wherein the buss bar is a bimetal plate having an aluminum positive plate and a copper negative plate, the voltage sensing contact extending from the copper negative plate. 14. The battery pack of claim 7, wherein the voltage sensing contact comprises a crimp barrel configured to be crimped to the corresponding voltage sensing wire. 15. The battery pack of claim 7, wherein the voltage sensing contact comprises a wire termination pad configured to receive an end of the corresponding voltage sensing wire, the corresponding voltage sensing wire being welded to the voltage sensing contact and the wire termination pad. 16. A battery pack comprising: a plurality of battery cells each having positive and negative cell terminals;a carrier being mounted over and spanning longitudinally across the plurality of battery cells, the carrier having trays with openings therethrough exposing the positive and negative cell terminals; anda plurality of buss bars received in corresponding trays, the buss bars each having a positive plate laser welded to the positive cell terminal of a corresponding battery cell through the corresponding opening and a negative plate laser welded to the negative cell terminal of a different battery cell through the corresponding opening;wherein the carrier comprises front trays extending forward from a front of the carrier, the front trays receiving battery terminals coupled to corresponding buss bars. 17. The battery pack of claim 16, wherein the trays have pockets receiving corresponding buss bars, the trays having tabs extending into the pockets to secure the buss bars in the pockets. 18. The battery pack of claim 16, wherein the buss bars are bimetal buss bars. 19. The battery pack of claim 16, wherein the carrier comprises flexible hinges between adjacent trays, the hinges allowing relative movement between the trays and corresponding buss bars held by the trays. 20. The battery pack of claim 16, wherein each buss bar comprises a voltage sensing contact extending therefrom, the voltage sensing contact being terminated to voltage sensing wires held by the carrier.