Leapmotor's Huzhou Super Factory recently opened to the public, and its automotive-grade SMT workshop sparked industry buzz — a single domain-control board integrates nearly 8,000 components, with line automation reaching 90%, and a production environment benchmarked directly against chip-level standards: temperature fluctuation within ±0.5°C, humidity ±1%RH, and Class-100,000 cleanliness.

Many are in awe of the placement machine's precision
and the high degree of line automation,
yet few notice one thing:
the watershed of automotive-grade soldering quality
hides precisely in the most overlooked
solder paste management step.

— SYSTEM READOUT · KEY FIGURES —

Automotive-grade products such as domain controllers, BMS and ADAS modules must meet the demanding requirements of −40°C~125°C wide-temperature operation, 15+ years of service life, and resistance to shock and vibration. Solder-joint reliability directly determines vehicle safety. That means every step of solder paste — from inbound to line — allows no room for error.

Yet most SMT workshops' solder paste management falls far short of automotive-grade production standards:

Ordinary industrial fridges swing widely in temperature each time the door opens, leaving uneven internal temperature. The flux ages prematurely, wetting performance drops, and cold joints and early failures are seeded;

Timing by hand and judging by feel makes every jar inconsistent. On high-density BGA parts, this easily produces voids, solder balls and other defects;

Paper ledgers are riddled with errors. When quality issues arise, the offending batch cannot be traced, and no complete chain record can be produced in an OEM audit — even supplier qualification is hard to keep;

Old and new paste pile up together; stale batches expire and are scrapped, material loss stays high, and switching between models easily leads to wrong picks and misuse.

— DIAGNOSIS —

Millions spent on high-end equipment,
yet basic steps quietly drag the yield down.

Many factories pour money into placement machines and reflow ovens, then stumble on the basic step of solder paste. The result: they can win high-end orders, but cannot deliver them stably.

True automotive-grade manufacturing is never just stacking high-end equipment — it is standardizing and controlling every basic step. The SUNNTOL Smart Solder Paste Cabinet is a full-process paste management solution built for automotive-grade SMT, turning a "skill job" into a "standard job".

The full range uses dual-circuit refrigeration with a standard condensate evaporation system, keeping internal temperature even with no dead corners and strictly matching the paste storage window. The HC-W constant-temperature model adds a 19-25°C thaw-zone control, so even automotive-grade paste with demanding thaw requirements keeps peak activity — safeguarding soldering reliability from the source.

The system supports pre-scheduled thawing; when time is up, a robotic arm auto-transfers each jar to the stirring station with precisely parameterized speed and duration, so every jar follows an identical thaw-and-stir process. No longer reliant on operator experience, it effectively lowers BGA void rates and makes line yield stable and controllable.

Every jar gets a unique identity. From inbound, storage, thawing and stirring to issuing, the whole process is auto-logged. Inventory is visualized in real time, data can be aggregated and exported, and it integrates seamlessly with MES/ERP systems. During an OEM audit, complete records can be pulled up with one click — passing qualification reviews with ease.

Dedicated slots plus precise robotic picking strictly enforce FIFO, eliminating stale stockpiling and expiry. It supports mixed storage of paste, red glue, tube paste and other material forms, fundamentally preventing mix-ups and misuse, and making multi-model, multi-order switching effortless.

Competition in new-energy vehicles has long moved from whole-vehicle specs down to every detail of the supply chain.

While SMT workshops compete over placement speed and line automation, it is the "small matter" of solder paste management that creates the quality gap. Only factories that manage a single jar of paste to perfection can truly capture the automotive-order dividend and stand at the forefront of industry upgrading.

If you are struggling with workshop material management, or looking for an SMT warehousing digital upgrade, you are welcome to visit us on-site at NEPCON ASIA 2026 for an in-depth exchange.