All-Solid-State Battery Remaining Capacity via Li Occupancy Profiling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In all solid state batteries, charge and discharge unevenness occurs in the thickness direction of the electrode layer, leading to variations in the actual remaining battery capacity despite similar open circuit voltage or state of charge (SOC), which affects the accuracy of capacity calculations.
Innovation Solution
A calculation device that sets and calculates the Li occupancy state in the thickness direction of the electrode layers, using a model to divide the electrode layer into multiple layers, and adjusts this state based on operation history to accurately determine the remaining battery capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If open circuit voltage or state of charge is used to calculate remaining battery capacity, then calculation is simple, but accuracy deteriorates due to charge and discharge unevenness in thickness direction
Solution Approach 1:
The electrode layer is divided into multiple sub-layers in the thickness direction to account for charge and discharge unevenness. Each sub-layer has its own Li occupancy state, allowing the model to capture spatial variations in lithium distribution that affect remaining capacity accuracy.
Solution Approach 2:
The calculation model transitions from a single-state-of-charge approach to a multi-dimensional approach by introducing the thickness direction dimension. This allows the model to represent Li occupancy variations through the electrode thickness, improving accuracy without excessive complexity.
2Measurement precision
If Li occupancy state in thickness direction is considered, then remaining battery capacity calculation accuracy improves, but calculation complexity increases
Solution Approach 1:
The Li occupancy state serves as an intermediary parameter that bridges the gap between measurable quantities (open circuit voltage, state of charge) and the target quantity (remaining battery capacity). By introducing this intermediate variable that accounts for thickness-direction variations, the model achieves higher accuracy without directly measuring complex spatial distributions.
Data Source
AI summary
A main object of the present disclosure is to provide a calculation device capable of accurately calculating battery remaining of an all solid state battery. The present disclosure achieves the object by providing a calculation device configured to calculate battery remaining of an all solid state battery including a cathode layer, a solid electrolyte layer, and an anode layer, the calculation device comprising: a setting unit configured to set a Li occupancy state in a thickness direction of an electrode layer which is at least one of the cathode layer and the anode layer, based on operation history of the all solid state battery; and a calculating unit configured to calculate the battery remaining based on the Li occupancy state.