Segmented Branch Interconnects for Modular Energy Storage Units
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The high costs and safety risks associated with installing and maintaining energy storage systems, particularly due to the need for extensive field labor and specialized expertise in handling high voltage DC cabling and equipment, are not adequately addressed by existing technologies.
Innovation Solution
The development of an energy storage unit (ESU) with a segmented branch interconnect system and oversized power transfer assembly that allows for above-ground connections, reducing the need for underground cabling and enabling the use of aluminum conductors without specialized expertise, thereby simplifying and cost-reducing the installation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional underground DC cabling and field integration work is used, then energy storage systems can be installed, but construction costs and labor costs increase significantly
Solution Approach 1:
The system is divided into modular energy storage units (ESUs) that can be independently manufactured and then interconnected through standardized AC coupling. Each ESU is a self-contained module with its own inverter and connection interfaces, eliminating the need for complex field integration of DC cabling and allowing straightforward serial or parallel connections between units.
Solution Approach 2:
AC power serves as an intermediary medium between multiple DC-coupled battery banks. Instead of directly connecting DC terminals from different battery enclosures (which requires specialized DC high-voltage work), each ESU converts DC to AC locally, and the AC outputs are then interconnected using standard AC distribution practices that are familiar to electrical contractors.
2Reliability
If high voltage DC cabling and specialized field work are used, then energy storage systems can operate, but safety risks for workers increase
Solution Approach 1:
AC power conversion acts as an intermediary that eliminates the need for workers to handle high-voltage DC cabling in the field. By converting DC to AC at each modular unit and using standard AC interconnection methods, the system maintains operational reliability while removing the specialized high-voltage DC work that creates safety hazards for installation and maintenance personnel.
Solution Approach 2:
Each energy storage unit is designed as a self-contained module with integrated inverters and protection systems that perform safety functions locally without requiring external DC cabling or specialized field intervention. The modular design allows standard electrical work practices to be used, reducing the need for specialized high-voltage DC safety procedures.
3Ease of manufacture
If aluminum conductors are used in ESUs, then material costs are reduced, but specialized in-the-field expertise is required
Solution Approach 1:
All aluminum conductor connections and terminations are pre-assembled and pre-tested during factory manufacturing of the modular ESUs. This preliminary action ensures proper aluminum connection techniques are applied under controlled conditions with appropriate expertise available, eliminating the need for field workers to possess specialized aluminum working skills while still achieving the cost benefits of using aluminum conductors.
4Adaptability or versatility
If extensive field labor is used for system integration, then energy storage systems can be deployed, but labor costs increase
Solution Approach 1:
The system is segmented into standardized modular ESUs that can be deployed in series or parallel configurations to meet different energy and power requirements. This segmentation allows scalable system expansion through simple addition of modules rather than complex custom field integration, reducing labor requirements while maintaining adaptability to various deployment scenarios.
Solution Approach 2:
The standardized AC coupling interfaces and modular ESU design provide universal connection methods that work across all system sizes and configurations. Whether deploying a single ESU or multiple units in series/parallel, the same standardized connection procedures apply, eliminating the need for different field integration approaches and reducing overall labor requirements while maintaining system scalability.
Data Source
AI summary
An energy storage unit (ESU) is provided herein. The ESU includes a housing forming an interior volume configured to store a plurality of batteries that can collectively provide a maximum power level. The ESU includes a segmented branch interconnect system including a power transfer assembly that includes a first power interconnect system and a second power interconnect system. The second power interconnect system is configured to be coupled to a first adjacent power interconnect system of a first adjacent ESU. The power transfer assembly includes one or more conductors coupled to the first power interconnect system and the second power interconnect system, and is configured to transfer electrical power therebetween. The power transfer assembly is rated to transfer a power level that is at least three times the maximum power level provided by the plurality of batteries stored in the housing.