Energy Accumulator Emulator Using Reference Cell Feedback
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Solution Overview
Problem
Current energy accumulator emulators lack precision and flexibility, particularly in simulating the behavior of batteries with varying cell states and temperatures, leading to suboptimal performance across the entire operating range and requiring frequent recalibration.
Innovation Solution
An energy accumulator emulation method that uses a real reference cell to measure and adjust the cell voltage, converting load current to cell tester load current and recalibrating the energy accumulator model based on measured values to maintain precision within a specified tolerance range, allowing for flexible emulation of various battery types and states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an energy accumulator model is used to emulate battery behavior, then the emulation can be performed without expensive real batteries, but the model precision deteriorates over time and across different operating ranges requiring frequent recalibration
Solution Approach 1:
The patent implements a feedback mechanism where the emulator continuously compares the modeled battery voltage with the actual voltage measured from a real reference cell. When the deviation exceeds a threshold, the system automatically triggers recalibration of model parameters. This closed-loop feedback ensures high precision is maintained throughout the entire operating range without manual intervention, resolving the contradiction between cost savings from using a model and the need for sustained model accuracy.
Solution Approach 2:
The patent dynamically adjusts model parameters based on operating conditions (temperature, state of charge, load) and recalibrates them during operation when deviations are detected. This allows the model to adapt to changing conditions and maintain precision across the entire operating range, rather than being fixed and requiring external recalibration cycles.
2Adaptability or versatility
If a single real reference cell is used to detect voltage behavior, then complete battery emulation is possible, but the ability to emulate different cell states and battery types is restricted
Solution Approach 1:
The patent makes the reference cell serve multiple functions: it acts as both the object of measurement and the calibration standard, and can be used to calibrate the model for different battery types and states by changing the modeling parameters. The same physical reference cell infrastructure supports emulation of various battery chemistries (Li-ion, LiFePO4) and states of charge, eliminating the need for multiple reference cells while maintaining precision.
3Measurement precision
If the energy accumulator model is recalibrated frequently to maintain precision, then model accuracy is improved, but the time and complexity of emulation setup increases
Solution Approach 1:
The patent implements self-service recalibration where the emulation system automatically detects when model precision degrades and performs recalibration without external intervention. The system monitors the deviation between modeled and actual voltage continuously, and when thresholds are exceeded, it autonomously adjusts model parameters. This eliminates the need for manual recalibration timing decisions and reduces setup time while maintaining high accuracy throughout operation.
4Measurement precision
If different energy accumulator models are provided for different battery types and precision requirements, then emulation precision is improved, but the device complexity and cost increase
Solution Approach 1:
The patent implements a dynamic model selection and parameter adjustment system. Rather than maintaining multiple static models for different battery types, the system uses a single flexible modeling framework that dynamically adjusts its parameters and complexity based on the specific battery type being emulated and the required precision level. The model structure and parameters are adapted in real-time based on operating conditions and calibration data from the reference cell, reducing overall system complexity while maintaining high precision across different battery types.
Data Source
AI summary
According to the invention, in an energy accumulator emulation the accuracy of energy accumulator emulation is increased in that a load current demand on the energy accumulator (20) is converted to a cell tester load current (IZ) of a real reference cell (6) based on the configuration of the energy accumulator (20) and the cell tester load current (IZ) is applied to the reference cell (6), and thereby the cell voltage (UZ) of the reference cell (6) is measured and the cell voltage (UZ) of the reference cell (6) is converted to a first energy accumulator voltage (UB) based on the configuration of the energy accumulator (20), a second energy accumulator voltage (UB_Mod) is calculated from the energy accumulator model (10) and the load current demand and the first energy accumulator voltage (UB) is compared to the second energy accumulator voltage (UB_Mod) and the energy accumulator model (10) is adjusted if the first energy accumulator voltage (UB) deviates by a specified tolerance range (TB) from the second energy accumulator voltage (UB_Mod).