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LiFePO4 Charging

RE Solutions > Energy Storage

Charging a LiFePO4 Battery pack is a bit easier than the lead acid technologies.

As with any other battery technology, it will start with a Constant Current (CC) stage, and at a predetermined voltage, it will switch to a Constant Voltage (CV) stage, and the Current will drop until it reaches a minimum level of about 0.02C.

The Charging curve of the LiFePO4 Battery is however, a much faster process than Lead Acid. Charging can be done at 0.3C (30% of Capacity). This means that the battery can be charged in 3 hours!

For Example: A 1000 Ah Battery can be charged at 0.3C (300 Amps or 30% of capacity).

The charging profile will start with a CC stage and will keep tie there until it reached a level near the charging voltage, after which it will switch to the CV stage. The CV stage value is managed by the charging profile, and in some instances it can be less than 15% of the total charging time, resulting in a very short CV stage.

The battery pack can be charged much faster than that of the normal 0.3C. Charging at 1C, or even a maximum of 2C is possible. This means that the battery can be charged at 100% of its capacity (60 minutes). Charing at 200% of its capacity (in 30 Minutes) is possible, but it will have an effect on the calendar life of the battery. It will not damage the battery, similar to an over charge or under discharge for instance, but it will have an effect.

ZettaJoule is using LiFePO4 chargers designed especially for LiFePO4 batteries. The chargers have a CAN BUS option that will allow the BMS to communicate Voltage and Current levels via the CAN BUS. The BMS, therefore, has full control over the charging profile.

The Charger is ordered for a specific Battery pack size and is shipped with certain Battery pack parameters.

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