CAP-02 · Pack assembly
21700 LFP modules, welded for rack duty.
The pack assembly line turns graded 21700 LFP cells into the welded, stacked and harnessed modules behind our 51.2V rack shelves and server BBU hardware — with a semi-finished electrical gate before anything reaches formation and aging.
FIG 02 · Laser welding head over a 21700 module
Weld quality first
A weld you can pull-check is a weld you can ship.
Every busbar joint on a VoltBridge module is a laser weld with locked parameters — power and duration are program-controlled per module type, and joint strength is verified by destructive pull checks on sampled batches.
- Matched cell groups enter welding, so capacity spread inside a module stays inside spec.
- Nickel-plated busbars welded without mechanical stress on cell terminals.
- Modules stacked under compression plates, harnesses routed and strain-relieved.
- BMS boards mated and fastened before the semi-finished test gate.
Process
Four stages from cell lot to tested module.
Cell sorting
Incoming 21700 LFP cells are capacity- and resistance-graded into matched groups; outliers never reach welding.
Laser welding
Busbars are welded with program-locked parameters; sampled joints go through destructive pull checks.
Module assembly
Cells are stacked under compression, harnesses routed and strain-relieved, and the BMS board is mated and fastened.
Semi-finished test
Electrical checks on the assembled module — polarity, insulation and voltage hold — before it moves to formation and aging.
Ready to put a shelf design on the weld line?
Bring the module drawing and the cell specification. We review weld feasibility, quote the line configuration and return sample modules for your validation.
