Modular Battery System for Solar Lighting
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Solution Overview
Problem
Solar-powered lighting systems face battery lifespan issues due to uneven energy supply and demand, leading to premature battery degradation, especially in seasonal variations, resulting in high maintenance and replacement costs.
Innovation Solution
A modular battery system controlled by a controller that adjusts the number of modules based on predicted energy supply and demand patterns, reducing unnecessary charge-discharge cycles and maintaining an optimal state of charge, thereby extending battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a Pb battery is used to store energy in solar powered lighting, then cost is reduced, but battery lifespan decreases to 2-3 years due to partial charging conditions
Solution Approach 1:
The battery system is divided into multiple individual battery modules that can be independently managed. Each module can be charged and discharged separately, allowing the system to optimize charging cycles for each module based on state of charge levels, thereby extending overall system lifespan while maintaining cost-effectiveness.
Solution Approach 2:
The system dynamically adjusts charging strategies based on real-time monitoring of each battery module's state of charge. When modules reach optimal charge levels, charging is redirected to other modules, creating a rotating charge-discharge pattern that prevents prolonged partial charging conditions and extends battery life.
2Duration of action of stationary object
If Li-Ion batteries are used to extend lifespan to 10 years, then battery life increases, but temperature-related degradation reduces lifespan under outdoor solar charging conditions
Solution Approach 1:
By segmenting the battery into multiple modules with independent thermal management, the system can monitor and control temperature conditions for each module separately. This allows for targeted cooling or charging adjustments based on local thermal conditions, reducing overall temperature-related degradation.
Solution Approach 2:
The controller acts as an intermediary that monitors temperature conditions and adjusts charging parameters accordingly. When temperature exceeds optimal thresholds, the controller modifies charging current or redirects charging to other modules, preventing thermal degradation while still achieving extended lifespan.
3Duration of action of stationary object
If battery capacity is over dimensioned to account for degradation, then lifespan is extended, but system cost and volume increase
Solution Approach 1:
The battery system is divided into multiple modules that can be independently managed and rotated through charge-discharge cycles. This segmentation allows the system to extend effective lifespan through intelligent cycle management rather than requiring excessive capacity, reducing overall system cost while achieving the same lifespan extension goal.
Solution Approach 2:
The system changes operational parameters by dynamically adjusting which modules are charged and discharged based on their state of charge and cycle history. This parameter optimization allows existing battery capacity to last longer through improved utilization, avoiding the need for over-dimensioning and associated cost increases.
4Use of energy by moving object
If batteries are fully used in winter to meet energy demand, then energy supply is maintained, but battery degradation accelerates due to complete discharge cycles
Solution Approach 1:
The battery system is divided into multiple modules that can be independently managed. During winter, the system rotates through multiple modules, ensuring that no single module undergoes complete discharge and recharge cycles every night. This distributes the degradation stress across all modules, extending overall system lifespan while maintaining adequate energy supply.
Solution Approach 2:
The system implements periodic rotation of battery modules through charge-discharge cycles. Instead of continuously cycling the same battery, the controller periodically switches which module is active, allowing modules to rest and recover between cycles. This periodic action reduces cumulative degradation while maintaining energy supply during winter months.
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 prolongs battery lifespan by evenly distributing charge-discharge cycles across modules, reducing degradation and maintaining performance over the designed lifetime, thus lowering maintenance and replacement costs.
Implementation Method 1
a solar panel for generating current to recharge the battery
Data Source
AI summary
A power supply system has a solar cell and a battery which comprises a plurality of modules. The number of modules used to supply electrical power to the load is controlled as well as the recharging of the modules, based on energy supply and demand data over a time period of multiple days. This enables the battery modules to be used more efficiently, and they can be charged and recharged less frequently on average, thereby extending the battery lifetime.