How ball screws and linear guides are specified for EV battery tray machining, stator winding, cell stacking and pack assembly - with the model numbers and accuracy classes involved.
New energy vehicle production has continued to expand rapidly. China has led global EV production and sales for several consecutive years, and penetration has passed the halfway mark. This growth has driven upstream intelligent-manufacturing equipment, and with it demand for precision transmission components.
The battery tray is the core structural part of a battery pack, typically welded from aluminium extrusion or stamped. Machining it requires a high-accuracy gantry machining centre whose X, Y and Z feed systems all use high-precision ball screws.
Stator windings are wound automatically on precision winding machines. The traverse mechanism needs high-accuracy linear motion, normally using miniature ball screws and miniature guides.
Stacking prismatic cells requires a high-accuracy pick-and-place mechanism that layers cathode, separator and anode sheets. Motion accuracy directly affects cell consistency and safety.
The pack assembly line includes module handling, bolt tightening and leak testing, using large numbers of Cartesian robots and linear modules.
| Component | ICE vehicle (per car) | New energy vehicle (per car) | Increase |
|---|---|---|---|
| Ball screws | 2-3 pcs | 6-8 pcs | 2-3x |
| Linear guides | 4-6 pcs | 12-16 pcs | 2-3x |
| Ball splines | 0-1 pcs | 2-3 pcs | new |
| Single-axis robots | 0-1 set | 2-4 sets | new |
As battery energy density rises and cell formats shrink, accuracy requirements keep tightening. C3-grade screws now account for over 40% of demand from new energy equipment.
To raise throughput, equipment speeds keep increasing. Demand is growing for large-lead screws (lead 20mm and above) and high-speed guides.
New energy equipment typically runs around the clock, so component life matters. Through better heat treatment and lubrication design, rated life now exceeds 50,000 km.
Factories typically expect year-round operation, so maintenance-free components are becoming standard. Self-lubricating screws and guides are increasingly used.
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