Battery Separator Reference Electrode for SOC Monitoring
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Solution Overview
Problem
Current lithium-ion battery systems for xEVs lack effective real-time monitoring of battery cell state, particularly the state of charge (SOC), which affects performance and longevity, and there is a need to enhance the distance vehicles can travel without recharging and reduce battery system costs.
Innovation Solution
A battery cell separator assembly with a base layer, first and second contacts, and a reference component is integrated into lithium-ion battery systems, allowing for real-time feedback on the state of charge and health of the battery cells through a porous, permeable separator that includes a ceramic coating and a reference component capable of maintaining constant voltage, enabling accurate SOC determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If real-time monitoring of battery cell state is implemented, then measurement precision of SOC is improved, but device complexity increases
Solution Approach 1:
The reference electrode is integrated directly into the separator structure, merging the monitoring function with the existing separator component. This eliminates the need for separate monitoring devices and reduces overall system complexity while enabling real-time SOC measurement through the reference electrode's direct electrical connection to the electrolyte.
Solution Approach 2:
The reference electrode serves as an intermediary element that provides direct electrical access to the electrolyte potential through the separator. By placing the reference electrode within the separator, the system gains real-time SOC information without requiring complex external monitoring systems, as the reference electrode directly measures the electrochemical potential difference.
2Measurement precision
If integrated reference electrode is added to separator, then measurement precision of battery state is improved, but manufacturing precision requirements increase
Solution Approach 1:
The reference electrode is combined with the separator in a single integrated assembly, where the reference electrode is positioned within the separator's porous structure. This merging approach allows both components to be manufactured and assembled together as one unit, reducing the need for separate precision alignment steps and simplifying quality control.
Solution Approach 2:
The reference electrode is positioned at a specific location within the separator where it can effectively measure the electrochemical potential. The separator provides a structured environment that guides the reference electrode to the appropriate position, ensuring accurate measurement without requiring high-precision assembly of the entire battery system.
3Measurement precision
If porous permeable separator with reference component is used, then SOC determination accuracy is improved, but manufacturing complexity increases
Solution Approach 1:
The reference component is integrated into the separator manufacturing process itself, combining two previously separate manufacturing steps into one. The separator and reference electrode are produced as a single integrated component, which can then be directly installed in the battery without requiring separate assembly operations.
Solution Approach 2:
The separator is designed with specific porous properties that facilitate the integration of the reference electrode. By controlling the porosity and permeability parameters of the separator during manufacturing, the reference component can be easily incorporated into the separator structure, maintaining ease of manufacture while enabling accurate SOC determination.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution provides accurate, real-time monitoring of battery health and SOC, enhancing the performance and longevity of lithium-ion batteries, allowing for optimized battery management and extended vehicle range without the need for frequent recharging.
Implementation Method 1
The base layer is operatively configured to separate the anode and the cathode within the housing
Implementation Method 2
a reference component capable of maintaining constant voltage, enabling accurate SOC determination
Data Source
AI summary
A battery cell system and an associated monitoring system is provided which includes at least an anode, a cathode, a separator formed from a base layer, first and second contacts and a reference component. The anode and cathode are disposed in a lithium ion non-aqueous solution within a housing. The base layer of the separator includes a first side and a second side. The base layer is operatively configured to separate the anode and the cathode within the housing. The first contact of the separator is affixed to the first side of the base layer between the base layer and an anode. The second contact is affixed to the second side of the base layer with the reference component disposed on the second contact.