Secondary Battery Control via Electrode Potential Monitoring
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Solution Overview
Problem
Existing secondary battery control methods fail to effectively suppress side reactions by monitoring voltage rather than electrode potentials, leading to potential overcharge and overdischarge issues.
Innovation Solution
A control apparatus and method that monitor and control the positive and negative electrode potentials within set limits, using resistance components to correct open circuit potentials and prevent side reactions by adjusting charge and discharge rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If voltage monitoring is used to control charge and discharge, then the control system is simple to implement, but side reactions cannot be effectively suppressed
Solution Approach 1:
The invention changes the monitoring parameter from voltage to electrode potential. By measuring the potential of each electrode relative to a reference electrode, the system can directly monitor the electrochemical state that causes side reactions, thereby improving reliability while maintaining operational simplicity through the use of a straightforward potential measurement system.
Solution Approach 2:
The invention introduces a reference electrode as an intermediary to measure the potential of each electrode. This reference electrode serves as a stable baseline, allowing the system to accurately determine the potential difference between electrodes and the reference, enabling effective side reaction suppression without complex control mechanisms.
2Reliability
If electrode potential monitoring is implemented, then side reactions can be suppressed, but the device complexity increases
Solution Approach 1:
A single reference electrode is introduced as an intermediary measurement point. This reference electrode provides a stable potential baseline against which both the positive and negative electrode potentials can be measured. This approach achieves accurate electrode potential monitoring without requiring multiple complex measurement systems, thereby limiting the increase in device complexity.
Solution Approach 2:
The reference electrode serves multiple functions simultaneously: it provides a stable potential reference for measuring both electrode potentials, enables calculation of cell voltage, and facilitates monitoring of both charging and discharging states. This multi-functionality reduces the need for separate measurement systems, thereby limiting complexity increase.
3Ease of operation
If voltage-based control is used, then the control method is simple, but overcharge and overdischarge protection is insufficient
Solution Approach 1:
The control method changes from voltage-based to potential-based monitoring. By measuring the potential of each electrode relative to a reference electrode, the system can directly detect the electrochemical state that precedes overcharge and overdischarge conditions, enabling more accurate and timely protection while maintaining control simplicity through straightforward potential comparison with threshold values.
Data Source
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AI summary
[PROBLEM] To suppress a side reaction of a secondary battery associated with a positive electrode potential and a negative electrode potential. [SOLVING MEANS] A control apparatus has a controller configured to control charge and discharge of a secondary battery. The controller acquires a positive electrode potential and a negative electrode potential of the secondary battery. The controller controls the charge and discharge of the secondary battery such that each of the positive electrode potential and the negative electrode potential changes within a range between an upper limit value and a lower limit value set for each of the positive electrode potential and the negative electrode potential.