Battery Pack Charging Control for Overcharge Prevention
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Solution Overview
Problem
Existing battery charging systems may overcharge batteries due to errors in charging devices or cell imbalances, leading to battery deterioration and swelling.
Innovation Solution
A battery management system (BMS) that identifies the charging device and adjusts the charging stop voltage and current based on cell voltage and current measurements, ensuring safe and efficient charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If constant voltage charging method is used to maximize battery capacity, then charging efficiency is improved, but overcharging risk increases due to charging device errors or cell imbalance
Solution Approach 1:
The patent implements a feedback mechanism where the BMS continuously monitors cell voltage and current during charging, compares actual values with predetermined thresholds, and dynamically adjusts charging parameters. When cell voltage approaches the charging stop voltage or current approaches the charging stop current, the BMS adjusts the charging stop voltage and current values to prevent overcharging while maximizing battery capacity.
Solution Approach 2:
The patent makes the charging stop voltage and charging stop current dynamic parameters rather than fixed values. The BMS adjusts these parameters in real-time based on charging conditions, cell state, and identified charging device characteristics. This dynamic adjustment allows the system to adapt to different charging scenarios and prevent overcharging while maintaining high charging efficiency.
2Quantity of substance
If charging stop voltage and current are set according to battery specifications, then battery capacity is maximized, but charging device errors cause overcharging
Solution Approach 1:
The patent performs preliminary identification of the charging device before actual charging begins. The BMS measures the charging voltage of the connected charging device and uses this information to set appropriate charging stop voltage and current values. This preliminary action allows the system to adapt to the specific charging device being used and prevent overcharging caused by device errors.
Solution Approach 2:
The patent changes the charging stop voltage and charging stop current parameters based on the identified charging device characteristics and actual cell state. Instead of using fixed specification values, the BMS dynamically adjusts these parameters to match the actual charging conditions and prevent overcharging while maximizing capacity.
3Power
If charging device voltage exceeds design specification, then charging speed increases, but cell voltage rises above safe threshold causing overcharge
Solution Approach 1:
The BMS continuously monitors cell voltage during charging and uses this feedback to adjust the charging stop voltage and current. When cell voltage approaches or exceeds safe thresholds, the BMS dynamically adjusts parameters to prevent further voltage rise, thereby preventing overcharge even when high-power charging devices are used.
Solution Approach 2:
The patent sets predetermined charging stop voltage and current values that act as safety cushions before dangerous overcharging conditions occur. These pre-set thresholds provide a buffer zone that prevents cell voltage from rising above safe levels, protecting the battery even when charging device voltage exceeds design specifications.
Data Source
AI summary
A method for controlling charging of a battery pack including multiple cells in a battery management system. The method includes checking identification information of a charging device connected to the battery pack and controlling charging of the battery pack using the charging device based on a charging stop voltage and a charging stop current stored in response to the identification information of the charging device. An apparatus for controlling charge of a battery pack is also provided.