Battery Charger Multi-Stage Charging Method
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Solution Overview
Problem
Conventional battery chargers often overcharge batteries, leading to damage and reduced lifespan due to lack of monitoring and adjustment of voltage and current during the charging process, particularly in secondary batteries like lead acid batteries.
Innovation Solution
A method involving a series of charging steps, including applying a first constant current, then a constant voltage, followed by a second constant current, and finally a float charge with tapering current, to safely and efficiently charge batteries, counteracting self-discharge and sulfation, and maintaining optimal battery capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple charger provides constant voltage and/or current without monitoring, then the charging process is simple and device complexity is reduced, but the battery can be overcharged and damaged
Solution Approach 1:
The charger continuously monitors battery voltage and current during charging, using feedback signals to detect when the battery is fully charged. This feedback mechanism allows the charger to automatically adjust or terminate charging, preventing overcharge damage while maintaining reasonable system complexity.
Solution Approach 2:
The charger dynamically adjusts charging parameters (voltage and current) based on real-time battery state. Instead of providing fixed constant voltage/current throughout, the system modifies these parameters during the charging process to optimize safety and efficiency, transitioning from simple to more sophisticated control as needed.
2Reliability
If a charger monitors and adjusts voltage and current during charging, then battery safety and charging efficiency are improved, but the device complexity increases
Solution Approach 1:
The charging process is divided into multiple distinct stages (constant current stage, constant voltage stage, and float charge stage). Each stage has specific monitoring and control requirements, allowing the charger to implement complex safety measures in a structured, modular manner that manages overall system complexity.
Solution Approach 2:
The charger changes operating parameters (voltage and current levels) at different charging stages. By systematically varying these parameters according to battery state, the system achieves high reliability without requiring overly complex control logic, as the parameter changes follow predetermined patterns based on battery chemistry.
3Productivity
If charging continues without monitoring, then charging speed and productivity are maintained, but overcharging occurs and battery life is reduced
Solution Approach 1:
The charger uses feedback monitoring to detect when the battery reaches full charge by measuring voltage and current characteristics. This allows the system to maintain high charging speed during the main charging phases while automatically terminating or reducing charge current when full capacity is achieved, preventing overcharge damage that would reduce battery lifespan.
Solution Approach 2:
The charging process employs periodic monitoring and adjustment cycles, transitioning between different charging modes (bulk charging, absorption, and float charge). This periodic structure maintains high productivity during active charging phases while periodically assessing battery state to prevent overcharging, thereby extending battery life.
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
This method effectively extends battery life by preventing overcharging, reducing sulfation, and maintaining charge capacity, while ensuring safe and efficient charging of secondary batteries.
Implementation Method 1
a secondary battery is a rechargeable battery that uses a reversible chemical reaction to provide a potential difference across two poles. Secondary batteries can be recharged by providing a current to the battery and reversing the chemical reaction used by the battery to provide energy.
Implementation Method 2
Battery chargers are used to reverse the chemical reaction that the battery uses to provide energy.
Data Source
AI summary
An improved battery charging method is usable by a battery charger to charge a battery. The charging method may include an optional desulfation process, a first constant current process, a constant voltage process, a second constant current process and a float charge process. The charging method preferably improves various charge and usage characteristics of the battery through a single or continued use of the battery charger utilizing the charging method.