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Battery Management Systems for Large Lithium-Ion Battery Packs

Section 1.3.2 Addenda

In batteries for aerospace applications, which must have an extremely high reliability, matched cells and a much simpler BMS are used.

The battery manufacturer tests multiple manufacturers and cells to select a batch of cells of high performance and reliability. Then, the manufacturer characterizes thousands of cells from that batch, and from that batch selects a group of cells that have perfectly identical characteristics (especially capacity, resistance and self discharge). Finally, the manufacturer balances those cells and assembles them into a battery.

Because the cells are identical, and they all start at the same SOC, it becomes a relatively safe assumption that all the individual cell voltages will remain in lockstep throughout the life of the battery. Therefore, a much simpler (and more reliable) BMS can be used, which only monitors the total battery voltage.

book/1.3.2.add (last edited 2010-10-29 02:40:35 by DavideAndrea)