Energy Storage Device With Dual Coupling Devices For Voltage Level Adaptation
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Solution Overview
Problem
Series-connected battery modules in energy storage systems are prone to failure and power reductions due to individual module failures, leading to system-wide energy supply failures, and existing battery direct inverters (BDIs) do not provide a constant DC voltage output.
Innovation Solution
An energy storage device with multiple energy storage modules connected in series, each equipped with two coupling devices that allow selective switching or bypassing of energy storage cell modules between two separate supply lines, enabling the generation of two distinct voltage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If battery modules are connected in series to meet power and energy requirements, then the power and energy capacity is improved, but the reliability deteriorates because a single module failure causes entire line failure
Solution Approach 1:
The energy storage system is divided into multiple independent energy supply lines, each comprising series-connected battery modules. This segmentation ensures that a failure in one line does not affect other lines, thereby maintaining system reliability while achieving required power capacity through parallel operation of multiple lines.
Solution Approach 2:
The invention dynamically adjusts the number of series-connected battery modules in each energy supply line by selectively switching modules in or out of the circuit. This allows the system to optimize the series connection configuration to meet power requirements while maintaining redundancy for reliability.
2Power
If multiple energy storage modules are connected in series to generate higher voltage levels, then the voltage output is improved, but the device complexity increases due to additional switching and control requirements
Solution Approach 1:
Each battery module is equipped with a coupling device that can selectively connect the module to different energy supply lines or bypass it entirely. This multi-functional coupling device allows a single module to serve multiple purposes: contributing to different voltage levels, providing redundancy, or being isolated for maintenance without affecting other modules.
Solution Approach 2:
The system employs dynamic switching of battery modules between series connections and bypass states based on real-time operational requirements. This dynamic reconfiguration allows the system to adapt the series connection topology to generate different voltage levels while managing switching complexity through controlled operation.
3Adaptability or versatility
If battery modules are switched and bypassed to generate different voltage levels, then the adaptability is improved, but the ease of operation deteriorates due to complex control requirements
Solution Approach 1:
The coupling devices are equipped with control units that autonomously manage the switching and bypassing of battery modules based on system requirements. This self-service capability reduces the operational burden on external control systems while maintaining high adaptability for generating different voltage levels.
Solution Approach 2:
The system incorporates feedback mechanisms where control units monitor the operational state of battery modules and automatically adjust switching configurations to maintain desired voltage levels. This feedback-driven control simplifies operation by eliminating manual intervention while preserving adaptability.
Data Source
AI summary
An energy storage device. An energy supply branch, with a plurality of energy storage modules is connected in series via first module connections along a first energy supply line and via second module connections along a second energy supply line. The energy storage modules include an energy storage cell module having an energy storage cell, a first coupling device having first coupling elements, configured to switch or bypass the energy storage cell module selectively between the first module connections, and a second coupling device having second coupling elements, which are designed to switch or bypass the energy storage cell module selectively between the second module connections. The energy storage device also includes an output connection coupled to an output of the first energy supply line; and two additional connections coupled to the outputs of the second energy supply line.