Secondary Battery Displacement Control for Fast Charging
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Solution Overview
Problem
Lithium ion secondary batteries face issues due to the expansion and contraction of active materials during charging and discharging, leading to stress on components and potential deformation, which can result in abnormal displacement and deterioration.
Innovation Solution
A method and device that detect displacement in secondary batteries using sensors and control charging and discharging currents to ensure the displacement does not exceed a threshold value, preventing abnormal displacement and deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high charging and discharging current is applied to achieve fast charging, then charging speed is improved, but displacement and stress on battery components increase leading to deformation and deterioration
Solution Approach 1:
The patent employs a feedback control mechanism where displacement sensors continuously monitor battery displacement during charging and discharging. The controller receives displacement information and adjusts charging/discharging current in real-time to maintain displacement within a predetermined range, enabling fast charging while preventing deformation
Solution Approach 2:
The system dynamically adjusts charging and discharging current based on real-time displacement conditions. When displacement approaches the upper limit, the controller reduces current; when displacement is within acceptable ranges, higher current is permitted, creating a dynamic balance between speed and reliability
2Productivity
If high charging and discharging current is applied to achieve fast charging, then charging speed is improved, but stress on component members increases causing expansion and contraction
Solution Approach 1:
The feedback control system monitors displacement of component members (cathode, anode, separator) and adjusts current accordingly. When displacement indicates excessive stress, the controller reduces current to protect component strength, enabling high productivity during normal operation while preventing damage
Solution Approach 2:
The system establishes a predetermined displacement range before operation begins, creating a safety buffer zone. This allows the battery to operate at high charge/discharge rates while maintaining a cushion against excessive stress that could damage components
3Duration of action of stationary object
If displacement monitoring and control is implemented to prevent deterioration, then battery lifespan is extended, but device complexity increases due to additional sensors and control mechanisms
Solution Approach 1:
The battery system performs self-monitoring and self-protection through integrated displacement sensors and control circuits. The system automatically detects displacement, compares it against predetermined ranges, and adjusts current without external intervention, extending lifespan while minimizing operational complexity
Solution Approach 2:
The control system serves multiple functions: it monitors displacement, determines charge/discharge states, controls current, and prevents deterioration all through a single integrated controller. This multi-functionality reduces overall system complexity despite the added capability
Data Source
AI summary
A method of charging and discharging a secondary battery includes detecting a displacement in a secondary battery by one or more sensors and controlling a charging and discharging current based on the detection result of each of the sensors. The charging and discharging current of the secondary battery is controlled so that an amount of displacement of the secondary battery does not exceed a threshold value.