Method for charging the energy storage cells of an energy storage device, and rechargeable energy storage device

摘要

The invention relates to a method for charging energy storage cells of an energy storage device with a plurality of energy storage modules which are connected in series in an energy supply line, each energy storage module comprising an energy storage cell module which has at least one energy storage cell and comprising a coupling device with coupling elements. The coupling elements are designed to selectively connect the energy storage cell module in the energy supply line or to bridge the energy storage cell module. The method consists of the following steps: coupling the output connections of the energy storage device to a DC voltage source, controlling the coupling devices of all the energy storage modules in order to bridge the energy storage cell modules in the energy supply line for a first specified period of time, and controlling the coupling devices of at least one first energy storage module in order to connect the energy storage cell module of the first energy storage module in the energy supply line for a second specified period of time after the first specified period of time has elapsed.

主权项

1. A method (10) for charging energy storage cells (5a, 5k) of an energy storage device (1) comprising a multiplicity of energy storage modules (3) connected in series in an energy supply string, each of the multiplicity of energy storage modules (3) comprising:
an energy storage cell module (5), which has at least one energy storage cell (5a, 5k), and a coupling device (7) comprising coupling elements (7a, 7b; 7c, 7d), which are configured to selectively switch the energy storage cell module (5) into the energy supply string or to bypass said energy storage cell module, wherein the method (10) has the following steps: coupling (11) output connections (1a, 1b) of the energy storage device (1) to a DC voltage source (2c); actuating (12) the coupling devices (7) of all of the multiplicity of energy storage modules (3) for bypassing the energy storage cell modules (5) in the energy supply string for a first predetermined time span, as a result of which electrical energy is drawn from the DC voltage source (2c) and impressed as current into a coupling inductance (2a) or the parasitic inductances of the energy storage device (1), as a result of which electrical energy is buffer stored in a DC link (2b); and actuating (13) the coupling devices (7) of at least one first energy storage module (3) for switching the energy storage cell module (5) of the at least one first energy storage module (3) into the energy supply string for a second predetermined time span once the first predetermined time span has elapsed.