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A battery system comprises a plurality of battery subunits, each subunit comprising a heatsink and at least one battery cell with a positive terminal and a negative terminal; where each heatsink has a respective busbar support mounted to it, and each busbar support includes first and second slots th

A battery system comprises a plurality of battery subunits, each subunit comprising a heatsink and at least one battery cell with a positive terminal and a negative terminal; where each heatsink has a respective busbar support mounted to it, and each busbar support includes first and second slots through which, respectively, a positive and a negative terminal of the at least one battery cell for that subunit passes, wherein a first busbar is located above and held at least in part by the first busbar support and is electrically connected to the negative terminal passing through the first slot in the first busbar support; and a second busbar is located above and held at least in part by the first busbar support and electrically connected to the positive terminal passing through the second slot in the first busbar support.

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1. A battery system comprising: a plurality of battery subunits, each subunit comprising a heatsink and at least one battery cell with a positive terminal and a negative terminal;a plurality of busbar supports equal in number to the plurality of battery subunits and each of which is mounted on the h

1. A battery system comprising: a plurality of battery subunits, each subunit comprising a heatsink and at least one battery cell with a positive terminal and a negative terminal;a plurality of busbar supports equal in number to the plurality of battery subunits and each of which is mounted on the heatsink of a corresponding different one of the plurality of subunits, each busbar support including: a first slot through which the positive terminal of the at least one battery cell for that subunit passes such that the first slot physically surrounds the positive terminal; anda second slot though which the negative terminal for the at least one battery cell for that subunit passes such that the second slot physically surrounds the negative terminal,said plurality of busbar supports including a first busbar support configured such that the first bus bar support is placed over a side of the battery subunit from which the positive terminal and the negative terminal protrude;a first busbar located above and held at least in part by the first busbar support and electrically connected to the negative terminal passing through the first slot in the first busbar support; anda second busbar located above and held at least in part by the first busbar support and electrically connected to the positive terminal passing through the second slot in the first busbar support; andthe heatsink comprises a large flat surface and raised wings wherein the battery cell is placed in the heatsink and the first busbar support includes a latch to grip a slot in the heatsink. 2. The battery system of claim 1 wherein the first busbar support includes a thermistor and a port in which a thermistor at least partially situated. 3. The battery system of claim 1 further comprising a busbar cover wherein the first busbar support includes a receptacle to which the busbar cover is attached. 4. The battery system of claim 1 wherein the first busbar support includes a channel in which wiring is situated and a flexible finger that at least partially retains the wiring within the channel. 5. The battery system of claim 1 wherein the first busbar support includes two latches between which a busbar is at least partially held. 6. The battery system of claim 1 wherein the first busbar support includes a main body situated between the first busbar and the positive terminal of the battery of the corresponding subunit. 7. The battery system of claim 1 wherein the battery cell is a prismatic battery cell.