Energy Storage Conversion Control for Mixed Battery Parallel Operation
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Solution Overview
Problem
Existing energy storage apparatuses lack flexibility and reliability due to the inability to replace or parallel different types of energy storage units, as their external characteristics, such as capacity and state of charge, are not simulable, limiting their compatibility and lifespan extension.
Innovation Solution
An energy storage apparatus with a conversion unit that adjusts its port voltage and current based on running information of the energy storage unit, allowing for the parallel operation and replacement of various types of energy storage units, including lithium and lead-acid batteries, without specific type limitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different types of energy storage units are used, then the energy storage apparatus can provide flexible power supply, but the external characteristics differ greatly preventing replacement and parallel running
Solution Approach 1:
The patent introduces a conversion unit as an intermediary between different types of energy storage units and the power supply system. This conversion unit converts the output characteristics of various energy storage units (lithium batteries, lead-acid batteries, flow batteries) into a standardized output, enabling them to run in parallel and be replaced flexibly without affecting system reliability.
Solution Approach 2:
The patent changes the electrical parameters (voltage, current) of different energy storage units through the conversion unit to achieve standardized external characteristics. By adjusting conversion parameters, the system can accommodate different energy storage unit types while maintaining consistent output characteristics for reliable parallel operation.
2Reliability
If a specific type of energy storage unit is used, then the apparatus has stable operation, but replacement is limited when life expires
Solution Approach 1:
The conversion unit is designed with universal compatibility to handle multiple types of energy storage units. It can convert output from lithium batteries, lead-acid batteries, flow batteries, and other types, allowing any expired unit to be replaced with a different type while maintaining stable operation through standardized conversion.
3Adaptability or versatility
If energy storage units with different external characteristics are connected, then diverse energy sources are utilized, but parallel running cannot be implemented
Solution Approach 1:
The conversion unit serves as a mediating interface that simplifies the connection between diverse energy storage units and the power supply system. By handling the complexity of characteristic matching internally, it enables parallel running without requiring complex external coordination or matching circuits.
Data Source
AI summary
An energy storage apparatus includes an energy storage unit and a conversion unit. The conversion unit may be configured to: obtain a given port voltage of the conversion unit based on running information of the energy storage unit, control a real-time port voltage of the conversion unit based on the given port voltage of the conversion unit, and control a real-time port current of the energy storage unit based on the given port voltage and the real-time port voltage of the conversion unit. The energy storage unit may be configured to be discharged or charged based on the real-time port current of the energy storage unit.