Battery Negative Tab Resistance Control for Silicon Anode Aging
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Solution Overview
Problem
Silicon-based cathodes experience rapid ion channel blockage and increased internal resistance due to silicon pulverization, leading to low efficiency, high expansion, and cycle attenuation, posing safety risks and limiting battery performance.
Innovation Solution
A battery control method and device that utilize two negative pole tabs to detect electrical parameters, allowing for the determination of a negative electrode plate's resistance value and adjustment of charging and discharging strategies to maintain optimal battery performance and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If silicon material proportion in silicon-based cathode is increased to improve energy density, then energy density is improved, but silicon pulverization causes ion channel blockage and internal resistance increase rapidly
Solution Approach 1:
The patent applies preliminary action by detecting the resistance value of the negative electrode plate before significant pulverization occurs and adjusting charging parameters in advance. The fuel gauge continuously monitors resistance and proactively modifies charging current based on detected changes, preventing ion channel blockage before it severely impacts battery performance.
Solution Approach 2:
The patent implements feedback by using the fuel gauge to continuously detect the resistance value of the negative electrode plate and using this information to dynamically adjust charging and discharging parameters. The system closes the control loop by comparing detected resistance against threshold values and automatically modifying operational parameters to maintain optimal performance while preventing damage.
2Use of energy by moving object
If silicon material proportion in silicon-based cathode is increased to improve energy density, then energy density is improved, but expansion increases and cycle attenuation worsens
Solution Approach 1:
The patent applies dynamics by making the charging and discharging parameters dynamic rather than fixed. The fuel gauge continuously monitors the resistance value of the negative electrode plate and adjusts charging current, voltage, and other parameters in real-time based on the detected state, allowing the battery to operate optimally across different cycle stages and preventing accelerated degradation.
Solution Approach 2:
The patent implements parameter changes by modifying charging and discharging parameters based on the detected resistance value of the negative electrode plate. The system changes operational parameters such as charging current thresholds, voltage limits, and discharge rates according to the battery's current state, thereby extending cycle life while maintaining high energy density performance.
3Reliability
If real-time detection and control of negative electrode plate resistance is implemented to improve battery safety and extend lifespan, then safety and service life are improved, but device complexity increases due to additional sensing and control requirements
Solution Approach 1:
The patent applies universality by designing the fuel gauge to perform multiple functions: it detects the resistance value of the negative electrode plate, determines battery state of charge, monitors battery health, and controls charging/discharging parameters. This multi-functional approach avoids adding separate dedicated components for each function, thereby limiting the increase in device complexity while achieving comprehensive safety monitoring and control.
Data Source
AI summary
A battery control method applied to a first battery includes obtaining measurement information of a first negative pole tab and a second negative pole tab, determining a first parameter of a negative electrode plate based on the measurement information, determining a charging parameter and/or a discharging parameter of the first battery based on the first parameter, and controlling charging or discharging of the first battery based on the charging parameter and/or the discharging parameter.