Battery Energy Calculation Using Intermediate State Parameters
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Solution Overview
Problem
Existing methods for determining the energy quantity in batteries, particularly lithium-ion batteries, face challenges in accurately accounting for state of charge-dependent and temperature-dependent parameters, leading to inefficiencies in energy calculation and loss consideration.
Innovation Solution
A method and control device that estimate parameters of an equivalent circuit model for intermediate states of charge, incorporating temperature dependence, and use a load profile to calculate energy through numerical integration, providing an energy amount signal that accounts for state of charge and temperature variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing methods for determining energy quantity in batteries are used, then the calculation process is simplified, but the accuracy of energy determination deteriorates due to failure to account for state of charge-dependent and temperature-dependent parameters
Solution Approach 1:
The patent segments the energy determination process into multiple discrete steps: receiving starting and ending states of charge, receiving load profile, determining intermediate states of charge, estimating parameters for each intermediate state, and calculating energy amount. This segmentation allows complex calculations to be broken down into manageable stages while maintaining accuracy through systematic parameter estimation at each step.
Solution Approach 2:
The patent performs preliminary actions by pre-determining intermediate states of charge between the starting and ending states, and pre-estimating parameters for each intermediate state before performing the final energy calculation. This preliminary parameter estimation ensures that all state of charge-dependent and temperature-dependent variations are accounted for before the actual energy integration, improving accuracy without complicating the final calculation step.
2Reliability
If state of charge-dependent and temperature-dependent parameters are incorporated into the energy calculation, then the reliability of energy determination improves, but the computational effort and processing time increase
Solution Approach 1:
The patent applies dynamics by making the parameter estimation adaptive to the specific battery conditions. Instead of using fixed parameters, the system dynamically estimates parameters for each intermediate state of charge based on the actual load profile and temperature conditions. This dynamic approach ensures reliability under varying conditions while optimizing computation by only calculating parameters where needed along the charge/discharge path.
Solution Approach 2:
The patent changes parameters based on state of charge and temperature conditions by estimating different parameters for each intermediate state of charge between the starting and ending states. This parameter adaptation allows the energy calculation to account for non-linear battery behavior and temperature effects, improving reliability. The systematic parameter changes are performed only at discrete intermediate states, balancing accuracy with computational efficiency.
Data Source
AI summary
Technologies and techniques for determining an energy quantity in a battery or battery cell, wherein an initial charge state and a final charge state is received. A load profile between the initial charge state and the final charge state is received, and intermediate charge states between the initial charge state and the final charge state and associated weighting factors are determined. Parameters of an equivalent circuit model of the battery or the battery cell are estimated for each of the determined intermediate charge states, and, proceeding from the load profile, the weighting factors and the parameters, an energy quantity of the battery or battery cell between the initial charge state and the final charge state is determined and is provided as an energy quantity signal. An associated control device for determining an energy quantity in a battery or battery cell is also disclosed.