Tab Related Defects in Li-ion Pouch Cell Manufacturing In lithium-ion pouch cells, tabs act as the electrical terminals connecting the internal electrodes to the external circuit. The positive and negative tabs are typically made from different conductive materials and must remain accurately positioned throughout cell assembly. During auto-packing, tabs pass through several critical operations including positioning, distance inspection, insulation verification, and sealing preparation. Key Tab Related Defects 1. Tab Misalignment Tab misalignment occurs when the positive and negative tabs move away from their intended position relative to the pouch centerline. 2. Tab Skew Tab skew refers to angular deviation from the intended tab orientation. It can affect tab spacing and create mechanical stress during sealing. 3. Tab Distance Out of Specification The distance between the positive and negative tabs must remain within specified limits. Incorrect spacing can affect electrical cle...

Polytechnic Interview Q&A — 24 branches, 480 interview questions. Click a branch to see its 20 Q&A. Mechanical Engineering 20 Q&A Q1. What is Mechanical Engineering? Mechanical Engineering is the branch that deals with the design, manufacturing, and maintenance of mechanical systems, covering areas like thermodynamics, machine design, manufacturing processes, and fluid mechanics. Q2. What is the difference between stress and strain? Stress is the internal resisting force per unit area developed inside a material when an external load is applied, while strain is the resulting deformation (change in length or shape) per unit original dimension caused by that stress. Q3. What is the difference between a two-stroke and four-stroke engine? A two-stroke engine completes a power cycle in one crankshaft revolution (two piston strokes), while a four-stroke engine takes two revolutions (four strokes: intake, compression, power, exhaust); four-stroke engines are more fuel effi...

ITI Interview – Mechanical/Manufacturing Trades — 15 trades, 300 interview questions. Click a trade to see its 20 Q&A. Fitter 20 Q&A Q1. What does a Fitter do? A Fitter assembles, fits, and repairs machine parts and mechanical components using hand tools and machine tools, ensuring parts fit together with correct alignment and tolerance. Q2. What is a try square used for? A try square checks whether two surfaces of a workpiece are exactly at 90 degrees to each other, and is also used to mark perpendicular lines. Q3. What is the difference between a file and a hacksaw? A file removes material by rubbing its toothed surface across a workpiece to smooth or shape it, while a hacksaw uses a thin, toothed blade to cut through metal. Q4. What is a vernier caliper used for? A vernier caliper measures internal, external, and depth dimensions of a workpiece with high precision, typically to an accuracy of 0.02mm. Q5. What is marking in fitting work? Marking is the process o...