Abstract: A battery power plant includes: battery modules of the Redox Flow type, battery strings, and a cooling system, wherein all battery modules are connected to the flow and return of the cooling circuit such that the cooling circuit forms a parallel connection of all the battery modules, the cooling system including at least one three-way valve for controlling a volume flow of the cooling fluid flowing through the cooling device, the cooling system for each of the battery modules including at least one first valve for controlling a volume flow of the cooling fluid flowing through the heat exchanger of an associated battery module, and the cooling system including a control device for processing values measured by the first temperature sensor and the second temperature sensor and for controlling settings of the first valve and the three-way valve in order to improve the efficiency of the battery power plant.

Abstract: A method for monitoring the state of a redox flow battery system that includes at least two battery modules connected in series. The method includes the following steps: S1: switching at least one battery module out of the series circuit; S2: discharging at least a partial volume of the electrolyte of the at least one battery module that was switched out of the series circuit in step S1, a potential difference being repeatedly detected, the potential difference being formed between a first potential of the negative electrolyte and a second potential of the positive electrolyte of the at least one battery module that was switched out of the circuit; S3: determining, from the potential difference values detected in step S2, the state of health of the at least one battery module that was switched out of the series circuit in step S1.

Abstract: Redox flow battery including a cell assembly and a tank device for receiving electrolyte, the cell assembly including a plurality of cells, and the battery including at least one measuring device for determining an electrolyte property, including at least one measuring cell, the at least one measuring cell including at least one connection for supplying electrolyte, at least one connection for discharging electrolyte and a channel, which is connected to one of the electrolyte circuits in such a way that during a circulation of the electrolyte, the electrolyte flows through the channel, and the channel including a first section and a second section, the cross section of the first section being smaller than the cross section of the second section, and the connection for discharging electrolyte being connected to the first section by a connection line and the connection for supplying electrolyte being connected to the second section by a connection line.

Abstract: A redox-flow battery includes a cell arrangement and a tank device for holding electrolyte. The battery includes a measuring device for determining an open circuit voltage and a circulating module, and the measuring device for determining an open circuit voltage includes at least one measuring cell and at least four connections. One connection is provided for the supply of anolyte, one connection for the removal of anolyte, one connection for the supply of catholyte, and one connection for the removal of catholyte. The circulating module includes at least one pump head and at least two pump impellers, and the at least one measuring cell is integrated into the pump head. A connection of the measuring device is connected to a pressure side of a pump impeller, and the associated connecting line is integrated in the pump head.

Abstract: A redox flow battery system includes at least two battery modules, a bidirectional converter, and a controller. The battery modules are connected in series and are connected to the converter. Each battery module has a cell array with a plurality of redox flow cells and a tank device for storing electrolyte and supplying electrolyte to the cell array. The battery system further includes a DC-to-DC converter for each battery module, one terminal of each DC-to-DC converter being connected to one battery module, and a second terminal of each DC-to-DC converter being connected to a common DC bus. An additional converter is connected to the DC bus. The controller is connected to the additional converter and to the DC-to-DC converters in such a way that the controller can control the additional converter and the DC-to-DC converters.

Abstract: The invention relates to a redox flow battery system, comprising a controller and a battery inverter, which is suitable for charging and/or discharging a battery. The battery inverter comprises: a) a plurality of battery connections, to each of which at least one battery can be connected; b) a first measuring device, which is suitable for measuring the voltage at a battery connection and which is connected to the controller with regard to signaling; c) a second measuring device, which is suitable for measuring the current at a battery connection and which is connected to the controller with regard to signaling; d) a grid connection, which can be connected to an alternating-current supply grid; and e) a plurality of DC/DC converters, of which at least one has a first bridge circuit directly connected to a battery connection.

Abstract: An energy storage system including an energy store with a plurality of flow batteries, a first voltage converter, an intermediate circuit connected to the first voltage converter, a second voltage converter connected to the intermediate circuit and a first of the batteries, a third voltage converter connected to the intermediate circuit and a second of the batteries, and a controller connected to the first, second, and third voltage converters. The controller is configured to simultaneously control a power flow direction of the second voltage converter and a power flow direction of the third voltage converter such that the power flow direction of the second voltage controller is in an opposite direction of the power flow direction of the third voltage controller, to control a power flow direction of the first voltage controller, and to charge and discharge the batteries.

Abstract: An electric power conversion device for charging and discharging energy storage devices having at least one bidirectional voltage converter which can be connected to a power supply network and to at least one electrochemical energy converter for an energy storage device that is configured as a flow battery and has a circulation arrangement for electrolytes. The electric power conversion device has a controller connected to the voltage converter and is designed to control the voltage converter with regard to the power flow direction thereof. The controller is designed to control one or more energy storage peripheral devices associated with the electrolytes depending on the power flow direction of the voltage converter specified by the controller. The controller has at least one control port for connection of at least one of these energy storage peripheral devices.

Abstract: The invention relates to a redox flow battery system, comprising a controller and a battery inverter, which is suitable for charging and/or discharging a battery. The battery inverter comprises: a) a plurality of battery connections, to each of which at least one battery can be connected; b) a first measuring device, which is suitable for measuring the voltage at a battery connection and which is connected to the controller with regard to signaling; c) a second measuring device, which is suitable for measuring the current at a battery connection and which is connected to the controller with regard to signaling; d) a grid connection, which can be connected to an alternating-current supply grid; and e) a plurality of DC/DC converters, of which at least one has a first bridge circuit directly connected to a battery connection.

Abstract: An electric power conversion device for charging and discharging energy storage devices having at least one bidirectional voltage converter which can be connected to a power supply network and to at least one electrochemical energy converter for an energy storage device that is configured as a flow battery and has a circulation arrangement for electrolytes. The electric power conversion device has a controller connected to the voltage converter and is designed to control the voltage converter with regard to the power flow direction thereof. The controller is designed to control one or more energy storage peripheral devices associated with the electrolytes depending on the power flow direction of the voltage converter specified by the controller. The controller has at least one control port for connection of at least one of these energy storage peripheral devices.

Abstract: An energy storage system including an energy store with a plurality of flow batteries, a first voltage converter, an intermediate circuit connected to the first voltage converter, a second voltage converter connected to the intermediate circuit and a first of the batteries, a third voltage converter connected to the intermediate circuit and a second of the batteries, and a controller connected to the first, second, and third voltage converters. The controller is configured to simultaneously control a power flow direction of the second voltage converter and a power flow direction of the third voltage converter such that the power flow direction of the second voltage controller is in an opposite direction of the power flow direction of the third voltage controller, to control a power flow direction of the first voltage controller, and to charge and discharge the batteries.