Battery Expansion Detection and Charging Control
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Solution Overview
Problem
Lithium-polymer rechargeable batteries experience increased internal resistance and physical expansion due to repeated charging and discharging, leading to reduced power output capacity and potential damage to portable electronic devices, with users often unaware of expansion until physical damage occurs.
Innovation Solution
Incorporating an expansion detector, such as a capacitive sensor, within the electronic device to monitor battery expansion and adjust charging characteristics, including voltage and current, to mitigate further expansion and extend battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If lithium-polymer batteries are used for portable electronic devices, then high energy density and long cycle life are achieved, but physical expansion occurs over time causing device damage
Solution Approach 1:
The patent applies preliminary action by implementing an expansion detector that continuously monitors battery dimensions before expansion causes damage. The system detects expansion early in the battery lifecycle and triggers preventive measures (such as adjusting charging parameters or alerting the user) before the battery reaches a critically expanded state that would cause device damage.
Solution Approach 2:
The patent implements feedback by using an expansion detector to continuously measure battery dimensions and feed this information back to a control system. Based on the detected expansion level, the system dynamically adjusts charging parameters (such as reducing charging current or voltage) to mitigate further expansion while maintaining battery operation, thereby resolving the contradiction between extending cycle life and preventing expansion damage.
2Productivity
If charging is performed at high voltage to increase power output, then charging speed is improved, but internal resistance increases and battery expansion accelerates
Solution Approach 1:
The patent applies dynamics by transitioning from a static charging approach to a dynamic one. The expansion detector continuously monitors battery dimensions, and based on real-time expansion data, the system dynamically adjusts charging parameters (voltage, current). When expansion is detected, the system automatically reduces charging intensity, creating a dynamic charging profile that adapts to battery condition changes throughout the charging process and over the battery lifecycle.
Solution Approach 2:
The patent implements parameter changes by modifying charging parameters (voltage, current, temperature) based on detected battery expansion. When the expansion detector identifies dimensional changes, the control system adjusts charging parameters to lower stress on the battery, such as reducing charging voltage or current, thereby preventing further acceleration of expansion while still allowing charging to proceed at optimized rates.
3Reliability
If expansion detection and compensation systems are added, then battery expansion is controlled, but device complexity increases
Solution Approach 1:
The patent applies mechanics substitution by replacing complex mechanical expansion restraint mechanisms with an electrical sensing and control system. Instead of using mechanical structures to physically constrain or counteract battery expansion, the system uses an expansion detector (electrical sensor) to monitor dimensional changes and controls charging parameters through electrical signals, thereby achieving expansion control with simpler, more integrated components.
Solution Approach 2:
The patent implements universality by designing the expansion detector and control system to serve multiple functions: detecting battery expansion, determining battery health status, adjusting charging parameters, and potentially providing user alerts. This multi-functional approach consolidates what could be separate complex subsystems into an integrated solution, reducing overall device complexity while achieving comprehensive battery management.
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
The system effectively detects and compensates for battery expansion, reducing the risk of damage to the device and extending the useful life of the battery by adjusting charging parameters in response to detected expansion.
Implementation Method 1
the expansion detector may be a capacitive sensor. The capacitive sensor can measure for changes in capacitance between two or more electrically conductive surfaces
Data Source
AI summary
Methods and systems for detecting and compensating for expansion of rechargeable batteries over time. An expansion detector may be coupled to or positioned proximate a rechargeable battery to monitor for expansion thereof. After expansion exceeding a selected threshold is detected, the expansion detector may report the expansion to an associated processing unit. The processing unit may undertake to arrest further rechargeable battery expansion by modifying or changing one or more characteristics of charging and/or discharging circuitry coupled to the rechargeable battery. For example, the processing unit may charge the rechargeable battery at a lower rate or with reduced voltage after detecting expansion.