Module EOL Testing
EOL testing is designed specifically for the final electrical safety and performance verification of power battery modules prior to shipment, it integrates into automated production lines to ensure products meet factory standards.
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Details Introduction
The EOL equipment utilizes a modular architecture and employs automatic crimping and aviation connector technologies to efficiently perform critical safety and electrical performance tests on the module—including insulation, withstand voltage, internal resistance, and continuity.
Once the module arrives via the conveyor line, a fixture tray automatically lifts and positions it; the overhead testing mechanism then descends to automatically mate with the module's high-voltage terminals. The equipment subsequently executes four core tests in sequence according to a preset program, requiring no manual wiring throughout the process.
Insulation test: Test voltage: DC 1000V; insulation resistance: ≥500 MΩ;
Withstand voltage test: Test voltage: DC 2800V; leakage current: ≤10 mA;
Key Features
✅ High Integration & Compactness
Built-in conveyor minimizes footprint; no external units needed for easy line integration.
✅ Modular & Flexible Design
Independent functional modules with aviation connectors enable quick swap, fixture adjustment, and easy expansion for varied models or process changes.
✅ Automation & Safety
Fully automated lift-dock-test process reduces manual work; equipped with high-voltage interlocks, light curtains, and E-stop for personnel and equipment protection.
✅ High Precision & Stability
High-precision high-voltage sources and measurement units ensure accurate and reliable test results; the structural design incorporates anti-interference and heat dissipation capabilities, making it suitable for continuous, high-tempo production.
Parameter
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Module EOL Testing
How Are the Production Capacity and Yield Rate of A Lithium Battery PACK Production Line Measured?
There are two core indicators: production cycle time (PPM), which means the number of modules produced per minute – industry high‑efficiency lines can reach 12‑15 PPM; and yield rate, with the industry standard requiring ≥99%. The yield rate is affected by cell consistency, welding quality, and test coverage.
What Are the Main Processes in a Lithium Battery PACK Production Line?
From cell to battery pack, the process includes: cell sorting → module stacking → pole welding (spot welding/laser welding) → BMS installation and wiring connection → insulation voltage withstand test → EOL comprehensive test. Welding and testing are the critical steps that determine the yield rate.
Why Spot Welders Are Commonly Used for Cell Connection in PACK Lines?
A battery spot welder is a type of resistance welding that uses low voltage and high current to melt the metal at the contact point within milliseconds. The heat is concentrated and does not damage the cells, and the weld spot tensile strength reaches ≥12 kg, making it the most reliable and efficient connection method for cylindrical cell assembly.
What Welding Processes are Mainly Used in a Lithium Battery PACK Production Line?
In a lithium battery PACK production line, laser welding is the most widely used core process, suitable for cell tab welding, module busbar welding, housing sealing, and more. Its advantages include high precision, a small heat-affected zone, effective protection of cells from heat damage, and reliable joining of dissimilar metals such as copper and aluminum.
Contact us
Address: 5 Xingfu Road, Miaoshan Development Zone, Jiangxia District, Wuhan City, Hubei Province, China
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