Battery Cell Voltage Acquisition Range for Precise SOC Equalization
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Solution Overview
Problem
Existing battery devices face challenges in accurately detecting the closed circuit voltage of lithium secondary batteries, which is crucial for equalizing the state of charge (SOC) of multiple batteries, leading to variations in SOC levels.
Innovation Solution
A battery device comprising a storage unit for battery information, a setting unit to define the acquisition range of closed circuit voltage, and a detection unit that converts the detected voltage into a digital signal within the set range, improving detection accuracy by adjusting the acquisition range based on past voltage values and changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed acquisition range is used for voltage detection, then the device complexity is reduced, but the detection precision deteriorates when voltage changes occur
Solution Approach 1:
The patent applies dynamics by making the acquisition range adjustable rather than fixed. The control unit dynamically changes the acquisition range based on the detected amount of voltage change, allowing the system to adapt to different voltage conditions and maintain high detection precision without requiring an overly complex fixed-range system for all scenarios
Solution Approach 2:
The patent changes the parameter of acquisition range based on the detected voltage change amount. When voltage change exceeds a threshold, the system adjusts the acquisition range to accommodate the variation, thereby maintaining detection accuracy under varying operating conditions while avoiding the complexity of a permanently high-resolution system
2Adaptability or versatility
If the acquisition range is widened to accommodate voltage changes, then the adaptability is improved, but the detection precision deteriorates
Solution Approach 1:
The system dynamically adjusts the acquisition range based on real-time voltage change detection. When voltage stability is detected, a narrow acquisition range maintains high precision. When voltage changes exceed the threshold, the range expands to accommodate the变化, thus adapting to different conditions while preserving precision when possible
Solution Approach 2:
The control unit preliminarily sets the acquisition range based on the detected voltage change amount before actual voltage detection. This preliminary adjustment ensures that the detection system is properly configured for the current voltage conditions, preventing precision loss that would occur with a fixed or improperly set range
Data Source
AI summary
A battery device includes: a storage unit that stores battery information including a closed circuit voltage of a plurality of battery cells electrically connected to each other and a change amount in the closed circuit voltage; a setting unit that sets an acquisition range of the closed circuit voltage based on the battery information; a detection unit that detects the closed circuit voltage; and a conversion unit that converts the closed circuit voltage detected by the detection unit into a digital signal within the acquisition range set by the setting unit.