Battery Charge Waveform Display for Assembled Pack Monitoring
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Solution Overview
Problem
In systems using assembled batteries as power supplies, the varying charge rates of individual secondary batteries complicate the recognition of charge states, making it difficult for users to easily identify full or empty charge conditions while maintaining a simple system configuration, and there is a need to prevent aged degradation and detect abnormalities.
Innovation Solution
A battery system comprising a battery control device with a maximum and minimum charge rate calculating unit, a waveform generating unit, and a display device that displays normal or abnormal waveform signals based on calculated charge rates, allowing users to easily recognize charge states and detect abnormalities through a simple configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the charge rates of individual secondary batteries are monitored separately, then the charge state information becomes more accurate, but the system complexity increases and user recognition becomes difficult
Solution Approach 1:
The patent combines the charge rate information of multiple secondary batteries into a single representative value (maximum charge rate) for display. This merging approach allows the system to maintain accurate monitoring of individual batteries while presenting simplified information to the user, resolving the contradiction between measurement precision and device complexity.
Solution Approach 2:
The patent applies different levels of detail to different parts of the system: individual charge rates are calculated and monitored with high precision for each secondary battery, but only the maximum charge rate is displayed to the user. This local differentiation maintains accuracy where needed while simplifying the user interface.
2Reliability
If the maximum charge rate is controlled to prevent full charge degradation, then battery reliability improves, but the charging operation becomes more complex
Solution Approach 1:
The patent implements a feedback control mechanism where the charging operation is continuously monitored and adjusted based on the maximum charge rate. When the maximum charge rate approaches the full charge state, the charging current is reduced or stopped, preventing overcharge degradation. This feedback loop maintains battery reliability while automating the control process.
Solution Approach 2:
The patent performs preliminary detection of the maximum charge rate before full charge is reached, allowing the system to prepare for charge termination in advance. This preliminary action enables smooth transition to discharge mode and prevents sudden changes that could affect battery reliability.
3Difficulty of detecting and measuring
If individual battery charge rates are monitored, then abnormality detection capability improves, but the information processing complexity increases
Solution Approach 1:
The patent extracts only the essential information (maximum charge rate) from the complete set of individual battery charge rates for display and general monitoring purposes. However, the underlying system retains access to all individual charge rate data for abnormality detection algorithms, effectively separating the information needed for user display from that needed for diagnostic purposes.
Data Source
AI summary
In a battery system of the invention, a BMS calculates a maximum charge rate representing a maximum value from present charge rates of plurality of secondary batteries constituting an assembled battery and a minimum charge rate. Then, the BMS generates a normal waveform signal in which the maximum charge rate is determined as a maximum peak and the minimum charge rate is determined as a minimum peak as a waveform signal which is displayed in a charge rate display range where a full charge rate in the case of a full charge state of the secondary battery is determined as an upper limit and an empty charge rate in the case of an empty charge state of the secondary battery is determined as a lower limit. Then, the BMS displays the normal waveform signal in the charge rate display range.