This one Light Bee, not Bubble Tea

That frame gap very fussy

Wah this frame ah, look like got space but actually quite choosy. The Light Bee has no battery box, just a long, narrow space in the frame with one end cut at an angle where the frame bends.

Confirm cannot anyhow ignore that outline, the pack simply will not go in. We model the frame’s inside as a 3D outline, then draw the pack within that space.

Builder count every cell one by one

Two modules, each 10S10P, stacked into one 20S10P. That is 200 cells, and the angled end steps down group by group.

We place every cell in DogeTune Builder and assign it to its series group. It only says “Pack valid” when the cells are all placed and the series chain is complete.

20S10P · 200 / 200 CELLS PLACED · PACK VALID · 349 × 135 MM MODULE FOOTPRINT

Cells in, rings on, steady lah

Cells go into a holder that matches the layout, row by row. One ring on every cell end before copper goes anywhere near them.

That small ring there, easy to forget then headache come find you. It keeps a busbar edge from shorting onto the cell can, so we put one on every cell end.

Copper cut to fit, no anyhow

Off-the-shelf busbars for this shape? Wah, good luck ah. We cut the copper busbars on our CNC, following the series groups in the drawing.

Each piece lands on the cells it is meant to join. The outline is odd, so the copper follows the drawing instead of pretending this is a normal rectangle.

Stack the modules, run the leads

Two modules go together with insulation between them. No bare copper reunion party, please lah.

Then we run the balance leads along the pack, one to each series group, so the BMS can watch those groups.

Case on, display there

The wrapped pack slides into a case built for that same long, angled outline. This shape follows the frame space all the way in.

The display fits into its cut-out on top, where you can see it on your bike. There it is, no need to squint from across the carpark.