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A battery system including: a plurality of subunits each of which has a heatsink and a battery cell and two voltage terminals symmetrically positioned with respect to a centerline of that battery cell, wherein all of the battery cells are arranged so that their voltage terminals are aligned along tw

A battery system including: a plurality of subunits each of which has a heatsink and a battery cell and two voltage terminals symmetrically positioned with respect to a centerline of that battery cell, wherein all of the battery cells are arranged so that their voltage terminals are aligned along two rows; a plurality of identical busbar supports equal in number to the plurality of subunits, each having two slots and mounted on a corresponding different one of the subunits with each of the terminals of the battery cell extending up through the two slots; and a plurality of bimetallic busbars, each one supported by a different corresponding subset of the busbar supports and electrically connected directly to either a first or second terminal of each of the battery cells of each of the modules on which those busbar supports are mounted.

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1. A battery system comprising: a plurality of subunits each of which comprises a heatsink and a battery cell having a top end and first and second voltage terminals both of which extend out of the top end of the battery cell, said first and second terminals of each battery cell being symmetrically

1. A battery system comprising: a plurality of subunits each of which comprises a heatsink and a battery cell having a top end and first and second voltage terminals both of which extend out of the top end of the battery cell, said first and second terminals of each battery cell being symmetrically positioned with respect to a centerline of that battery cell, wherein all of the battery cells among the plurality of subunits are arranged so that their first voltage terminals are aligned along a first row and their second voltage terminals are aligned along a second row;a plurality of identical busbar supports equal in number to the plurality of subunits, each busbar support among the plurality of busbar supports having two slots and being mounted on a corresponding different one of the subunits with each of the first and second terminals of the battery cell for that subunit extending up through a corresponding different one of the two slots; anda plurality of bimetallic busbars, each one supported by a different corresponding subset of the busbar supports and electrically connected directly to either a first or second terminal of each of the battery cells of each of the modules on which those busbar supports are mounted,wherein the battery cells are prismatic battery cells, both the first row and the second rows are situated on the same side of the battery system, and all but one of the heatsinks are identical to each other. 2. The battery system of claim 1, wherein each of the plurality of subunits are identical to one another except for the orientation of each of the battery cells of the subunits with respect to the battery cell's centerline. 3. The battery system of claim 1, wherein each of the plurality of busbars electrically connects at least two adjacent terminals of the same row. 4. The battery system of claim 1, further comprising a first pressure plate and a second pressure plate wherein the plurality of subunits is arranged as a stack of subunits and wherein the stack of subunits is located between the first pressure plate and the second pressure plate. 5. The battery system of claim 4, wherein one or more compliant pads are located between the first pressure plate and the neighboring subunit. 6. The battery system of claim 4, further comprising a band wherein the band encircles the first and second pressure plates and the plurality of subunits. 7. A battery system comprising: a plurality of subunits each of which comprises a heatsink and a battery cell having a top end and first and second voltage terminals both of which extend out of the top end of the battery cell, said first and second terminals of each battery cell being symmetrically positioned with respect to a centerline of that battery cell, wherein all of the battery cells among the plurality of subunits are arranged so that their first voltage terminals are aligned along a first row and their second voltage terminals are aligned along a second row;a plurality of identical busbar supports equal in number to the plurality of subunits, each busbar support among the plurality of busbar supports having two slots and being mounted on a corresponding different one of the subunits with each of the first and second terminals of the battery cell for that subunit extending up through a corresponding different one of the two slots; anda plurality of bimetallic busbars, each one supported by a different corresponding subset of the busbar supports and electrically connected directly to either a first or second terminal of each of the battery cells of each of the modules on which those busbar supports are mounted,wherein the battery cells are prismatic battery cells, both the first row and the second rows are situated on the same side of the battery system, and all but two of the heatsinks are identical to each other. 8. The battery system of claim 7, wherein each of the plurality of subunits further comprises a second battery cell having a top end and first and second voltage terminals both of which extend out of the top end of the second battery cell, said first and second terminals of each second battery cell being symmetrically positioned with respect to a centerline of that battery cell wherein each of the second battery cells among the plurality of subunits are arranged so that their first voltage terminals are aligned along the first row and their second voltage terminals are aligned along the second row. 9. The battery system of claim 7, wherein each of the plurality of subunits are identical to one another except for the orientation of each of the battery cells of the subunits with respect to the battery cell's centerline. 10. The battery system of claim 7, wherein each of the plurality of busbars electrically connects at least two adjacent terminals of the same row. 11. The battery system of claim 7, further comprising a first pressure plate and a second pressure plate wherein the plurality of subunits is arranged as a stack of subunits and wherein the stack of subunits is located between the first pressure plate and the second pressure plate. 12. The battery system of claim 11, wherein one or more compliant pads are located between the first pressure plate and the neighboring subunit. 13. The battery system of claim 11, further comprising a band wherein the band encircles the first and second pressure plates and the plurality of subunits. 14. The battery system of claim 7, wherein each of the plurality of subunits further comprises a second battery cell having a top end and first and second voltage terminals both of which extend out of the top end of the second battery cell, said first and second terminals of each second battery cell being symmetrically positioned with respect to a centerline of that battery cell wherein each of the second battery cells among the plurality of subunits are arranged so that their first voltage terminals are aligned along the first row and their second voltage terminals are aligned along the second row.