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What are the pre-processing steps for the battery module before and after the capacitance test?

The pre-treatment of battery modules before and after capacitance testing is a key step to ensure battery performance and safety. Here's a breakdown of these steps:

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Charge to preset State of Charge (SOC)

Before the capacitance detection, the treated single battery needs to be charged so that the state of charge (SOC) of the battery reaches the first preset value, usually the state of full charge (100% SOC).

Static and pressure drop monitoring

Cells that reach the first preset value stand for the first preset time (for example, 48-72 hours), and monitor the voltage drop of each cell to screen out cells whose voltage drop is greater than the first preset voltage drop.

SOC Adjustment

Adjust the SOC of each cell after screening to the second preset, where the second preset is less than the first preset (for example, adjusted to 50% SOC).

Battery module assembly

The adjusted individual battery is assembled into a battery module, and the battery module is charged so that its SOC reaches a third preset value, usually greater than the second preset value (for example, charged again to 100% SOC).

Secondary standing and pressure drop judgment

Stand the battery module at a preset temperature (e.g. 20-25°C) for a second preset time (e.g. 48-72 hours), and judge whether the battery module is qualified by judging the voltage drop of the battery module. If the voltage drop of the battery module is greater than the second preset voltage drop, the battery module is unqualified.

Cleaning

Before the capacitance test, the battery needs to be cleaned to remove surface oil and impurities. Before cleaning, it is necessary to check whether the roller, belt and other parts of the cleaning machine are clean, so as not to pollute the battery.

Pretreatment

The battery is placed in a chemical tank for pretreatment. Pretreatment is mainly to remove oxides and other impure substances inside the battery, so that the battery can reach a clean state more quickly during subsequent commissioning. Pretreatment can be performed using acidic or alkaline solutions.

Plasma pretreatment

Plasma cleaning and activation of the carrier film before coating the paste ensure stable battery performance. Plasma technology is also suitable for surface activation/cleaning of battery modules to ensure optimal surface characteristics and reliable bonding or packaging.

CONCLUSION

The above pretreatment steps can ensure the performance and safety of the battery module before and after the capacitance detection, and improve the consistency and reliability of the battery.

NEXT read:What maintenance needs to be performed after the battery capacity division test?

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