V-shaped bay, V-shaped battery

72V tells you the voltage, not whether the battery fits your bay. This one narrows towards the bottom, so the groups follow that shape from drawing to case.

IN SHORT

“72V” says voltage, not fit.
This bay narrows towards the bottom, so the cell groups interlock to use its shape.
Copper, wrap and case follow the V through to the finished pack.

A CHAT WE SEE A LOT

Rider

bro found one 72v universal battery online

can put inside my v bay or not sia

universal until u open the battery door

then suddenly not universal

but voltage same leh

voltage same, shape different lor

your bay is v-shaped

battery anyhow square one got chance cannot fit

so squeeze in can already ah

eh dont squeeze battery to make it fit lah

send the bay measurements or come down

we draw it to your v shape first

The bay get narrower down there

Wah this bay ah, wide at the top then narrow at the bottom, like a V with the point cut off. A normal rectangle come in and immediately got problem.

Confirm voltage cannot fix the shape, even if the number looks right. A rectangular layout can leave dead space down the sides or simply not go in, so we model the bay before drawing the pack.

Groups squeeze into the V

Straight rows here? Can go holiday already. In DogeTune Builder, the 20 series groups interlock down the V, each shaped to use the space beside the next.

Two 10S12P modules make one 20S12P, that is 240 cells altogether. We place every cell and check the layout until Builder says “Pack valid”.

20S12P · 240 / 240 CELLS PLACED · PACK VALID · 304 × 236 MM FOOTPRINT

Holder follow the V also

Wah the holder also must follow the same V, if not all the cells stand there like nobody tell them where to go. That one very awkward.

We place the cells row by row and check them against the drawing as they go in. The holder follows the layout shape.

Copper do the same dance

Interlocking groups means copper also must follow along. Big rectangle busbar come here anyhow cover, sure got problem one.

Each busbar is cut to the outline of its group, then spot welded on row by row. The drawn group shape decides where the copper goes.

FR-4 on, BMS on top

Steady lah, now the modules get wrapped in FR-4 sheet and the BMS sits on top. Whole thing still following the V shape.

The BMS leads can reach every series group from there. That is how the wiring is arranged before the pack goes into its case.

THE FINISHED PACK

V in, V out, siap

Wah finally, the finished pack follows the bay’s V profile. It slides in without pressing, and the shape uses the space down the sides instead of leaving dead space there.