Battery Charging Control via Resistance Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing battery charging methods fail to stabilize battery charging processes effectively, leading to inefficient and unstable charging due to variations in battery resistance, which can result in incorrect charging and reduced battery lifespan.
Innovation Solution
A battery charging method and pack that utilize a battery management system (BMS) with a resistance determining unit to estimate battery resistance multiple times during constant voltage supply periods, changing the charging period from constant voltage to constant current based on resistance changes within a predetermined range (no more than 10%), using current and voltage measurements to adjust charging currents and voltages accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional battery charging methods are used, then charging can be completed, but the charging process is unstable and inefficient due to battery resistance variations
Solution Approach 1:
The patent implements a feedback mechanism where the BMS continuously monitors battery resistance during charging and adjusts charging parameters accordingly. The resistance determining unit measures resistance at multiple points, and the BMS uses this feedback to dynamically switch between constant current and constant voltage charging modes, ensuring stable and efficient charging despite resistance variations.
Solution Approach 2:
The patent applies dynamic charging control by switching between different charging modes (constant current and constant voltage) based on real-time resistance measurements. The charging current and voltage are dynamically adjusted according to the battery's resistance state, allowing the system to adapt to changing battery conditions during the charging process.
2Reliability
If resistance monitoring is performed multiple times during constant voltage supply period, then charging stability is improved, but system complexity increases
Solution Approach 1:
The patent performs preliminary resistance measurements at the beginning of the constant voltage supply period and at intermediate points before making charging mode decisions. By proactively monitoring resistance at predetermined intervals, the system can anticipate resistance changes and adjust charging parameters in advance, maintaining stability without requiring continuous complex monitoring.
Solution Approach 2:
The patent divides the constant voltage supply period into multiple stages with resistance measurements at each stage. The charging process is segmented into distinct phases (constant current period, constant voltage period with intermediate measurements), allowing the system to manage complexity by handling resistance monitoring in discrete steps rather than continuously.
3Reliability
If charging period is changed based on resistance changes within 10% range, then overcharging is prevented and battery lifespan is extended, but charging time increases
Solution Approach 1:
The patent changes charging parameters (current and voltage levels) based on resistance variations within a 10% threshold during the constant voltage period. When resistance changes exceed this threshold, the system transitions from constant voltage to constant current charging mode, preventing overcharging while minimizing unnecessary delays by using a reasonable threshold value.
Solution Approach 2:
The patent applies partial monitoring by focusing resistance measurements specifically during the constant voltage supply period when resistance changes are most critical. Rather than monitoring continuously throughout the entire charging process, the system concentrates monitoring efforts where they are most needed, balancing safety with charging efficiency.
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 approach ensures stable battery charging by adjusting charging periods in response to resistance changes, preventing overcharging and extending battery lifespan by maintaining optimal charging conditions.
Implementation Method 1
a resistance determining unit configured to estimate resistance of the battery... The resistance determining unit calculates the resistance of the battery by using the charging current and the charging voltage
Implementation Method 2
a battery management system (BMS) configured to charge the battery in a plurality of charging periods respectively including constant current supply periods and constant voltage supply periods
Data Source
AI summary
A battery pack is disclosed. In one aspect, the battery pack includes a chargeable battery and a battery management system (BMS) configured to charge the battery in a plurality of charging periods each including a constant current supply period and a constant voltage supply period. The battery pack also includes a resistance estimator configured to estimate the resistance of the battery. The BMS is further configured to change a charging period of the battery from a constant voltage supply period of an ith charging period to a constant current supply period of an (i+1)th charging period based on the resistance of the battery, and wherein i is a natural number.