Quality system

Six QC gates stand between cell and shipment.

VoltBridge builds every BBU on a documented quality chain: incoming cell grading, weld inspection, in-process testing, formation and aging, end-of-line verification and outgoing QC. Results are bound to batch and serial number — and travel with the shipment.

View the test matrix

Process control

The six QC gates

Each gate has written acceptance criteria and a record. A unit does not advance on schedule pressure alone — it advances when the gate data says so.

Cell IQC and grading

Incoming 21700 LFP cells are verified against datasheet limits, capacity-graded and matched into groups, so every pack starts from cells with aligned capacity and internal resistance.

Spot-weld and assembly inspection

Interconnect weld joints are inspected against workmanship criteria before modules are closed; connection and torque records are kept per unit.

In-process testing

Semi-finished packs are checked for voltage, polarity, insulation and BMS communication before final assembly, so defects are caught before they are enclosed.

Formation and aging

Modules are formed and cycled on aging racks. Capacity retention and self-discharge behaviour are recorded and compared against acceptance limits.

End-of-line verification

Finished units repeat full functional tests — capacity, protection response, telemetry and insulation — with results bound to the serial number.

OQC outgoing inspection

Before shipment, outgoing QC samples each batch against the release checklist and issues the certificate of conformance with the shipping document pack.

Test matrix

Eleven documented test stages

What we test, the method basis each test is run to, and the documentation each result produces. Documentation is issued with the batch or on request — never as a promise.

Test item	Method basis	Result documentation
Cell capacity grading and matching	IQC per cell datasheet limits and internal grading SOP	Batch grading report, per lot
AC internal resistance	4-wire measurement at defined SOC points, internal SOP	Match record bound to pack serial
Insulation withstand (hipot)	Referenced to IEC 62619 insulation requirements	EOL test record, per unit
Ground-bond and continuity	Protective-bonding check on rack hardware, internal SOP	EOL test record, per unit
Temperature cycling	UN 38.3 T.2 thermal profile, type test	Type-test report, per platform
Vibration	UN 38.3 T.3, type test	Type-test report, per platform
Mechanical shock	UN 38.3 T.4, type test	Type-test report, per platform
External short-circuit protection	UN 38.3 T.5 plus BMS protection-response check	Type-test report and BMS event log
Over-charge / over-discharge protection	UN 38.3 T.6 / T.7 plus BMS limit verification	Type-test report and BMS event log
Thermal-runaway pre-check	Cell-level screening aligned with the UL 9540A test method	Test data available per product, on request
UN 38.3 pre-compliance (T.1 to T.8)	In-house pre-compliance bench before third-party testing	Pre-compliance data pack on request

FIG.Q2 — Method bases are the standards and internal procedures each test is performed to. Cells are UN 38.3 tested; packs are designed and tested to IEC 62619; the VB line follows a UL 1973 certification path through accredited labs.

VoltBridge QC laboratory: cell grading benches, formation racks and end-of-line test stations

Test lab

The lab behind the numbers

Quality claims are only as good as the benches that produce them. The VoltBridge lab runs the gates above in-house, on production hardware, at production volume.

In-house benches cover UN 38.3 pre-compliance items before samples ever reach accredited third-party labs.
Formation and aging racks record capacity and self-discharge for every module — not sampled lots.
EOL stations push finished units through protection-response and telemetry checks, and bind results to each serial number.
Batch records stay retrievable by lot number, so field questions get answered from data, not memory.

FIG.Q3 — QC laboratory: grading, formation and end-of-line stations

Quality FAQ

The three questions every auditor asks

Short answers here; the full list lives on the FAQ page.

Q01Can we get the UN 38.3 Test Summary?▾

Yes. Cells are UN 38.3 tested and the Test Summary is available on request. Every shipment also carries the standard document pack: certificate of conformance, MSDS, Class 9 transport documentation and the drop test report.

Q02Is production traceable by batch?▾

Every module carries a serial number tied to a batch record covering cell grading data, weld and assembly checks, formation and aging curves, and end-of-line results. Records are retained and retrievable by lot number for service and audit questions.

Q03What does the warranty cover?▾

The product line carries a 5-year standard warranty. Cycle- and throughput-based terms are written in the warranty statement included with every quotation, so coverage is explicit before you order rather than after a claim.

Ship with evidence

Ask for the paperwork before the pallet ships.

Every VoltBridge shipment carries a document pack: certificate of conformance, MSDS, Class 9 transport documentation, and the UN 38.3 Test Summary on request. If a supplier cannot produce batch records, keep shopping.

Browse spec sheets