Energy storage assembly and method for operating such assembly

Abstract

The invention relates to an energy storage assembly, comprising a plurality of cells connected in series, wherein the series connection of cells is connected to a power output of the energy storage assembly and a control unit, wherein at least a part of the cells (Z1, Z2,...Zn) connected in series is connected to the power output (5, 6) and the control unit (BMS-C) by way of potential-free controlled converter and control units (IRl,IR2,...IRn) connected in parallel, such that during the charging, discharging and recharging processes each of the cells (Z1, Z2,...Zn) is operated according to the individual performance characteristics of said cell (Z1, Z2,...Zn) by means of selective current drains by the converter and control units (IRl,- IR2-,...IRn) and a total current flowing at the power output of the energy storage assembly (5, 6); is formed by a base current flowing through the series connection of the cells (Z1, 7.2,...Zn) and by additional currents, which are drained from the individual cells (Z1, Z2,...Zn) depending on the capacity of the cells. The invention allows for the interconnection of different cell types to form an energy storage assembly and for uniform charging or discharging thereof, thus facilitating optimal use of the energy stored and extending the total usage period.

Description

technical field [0001] The invention relates to an energy storage assembly comprising a plurality of batteries connected in series and to a control unit, and to a method for operating such an assembly, wherein the batteries connected in series are connected to the One electrical output of the energy storage assembly. Background technique [0002] High-power accumulators, such as are used, for example, as energy stores in electric vehicles, generally comprise a plurality of primary cells connected to one another in order to meet the requirements placed on the energy store in terms of supply voltage, power output and capacity. [0003] As a fundamental technology for galvanic cells, different electrochemical processes are available, named based on the materials used. These include in particular lithium-ion, lithium-polymer, nickel metal hydride or lithium iron phosphate technologies. [0004] All of these available technologies share the common feature that batteries that ar...

AI Technical Summary

Problems solved by technology

[0005] As a result, they have different charging and discharging characteristics, which causes individual cells to be loaded to a greater extent and thus fail prematurely, which in turn leads to failure of the entire battery

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