Battery Management Using Rest-Period Voltage Difference Estimation
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Solution Overview
Problem
Existing impedance measurement methods require dedicated equipment for alternating current application, making it difficult to estimate battery state during charging or discharging.
Innovation Solution
A battery management device that estimates battery state by analyzing the difference in output voltage during rest periods after charging or discharging, using a ratio of voltage differences in specific periods to determine battery defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If impedance measurement is performed using dedicated equipment for alternating current application, then measurement precision is improved, but device complexity increases and ease of operation deteriorates
Solution Approach 1:
The battery management device uses its own existing DC power supply and voltage measurement capabilities to perform battery state estimation during charging/discharging, without requiring external impedance measurement equipment. The system serves itself by utilizing resources already present in the charging/discharging circuitry.
Solution Approach 2:
The invention changes the measurement parameter from complex impedance (requiring AC signals) to output voltage characteristics during DC charging/discharging. By measuring voltage differences before and after constant current application, and analyzing the temporal变化 pattern, the system achieves state estimation using only DC conditions that the battery management device already provides.
2Measurement precision
If impedance measurement equipment is prepared for battery state estimation, then measurement precision is improved, but ease of operation worsens
Solution Approach 1:
The battery management device performs self-diagnosis by utilizing its own DC power supply functionality. During normal charging or discharging operations, the device measures voltage characteristics and estimates battery state without requiring separate measurement equipment or specialized AC signal generation capabilities.
Solution Approach 2:
The DC power supply unit in the battery management device serves dual purposes: it provides charging/discharging current while simultaneously functioning as the test signal source for battery state estimation. This multi-functionality eliminates the need for dedicated impedance measurement equipment.
3Measurement precision
If dedicated equipment for impedance measurement is used, then measurement precision is improved, but productivity decreases
Solution Approach 1:
The battery management device continuously monitors battery state during charging/discharging operations without interrupting the current flow. By performing voltage measurements and state estimation alongside the primary charging/discharging function, the system maintains continuous useful action rather than alternating between measurement and operation modes.
Solution Approach 2:
The invention merges the battery state estimation function with the charging/discharging operation. The same DC power supply circuitry used for charging/discharging is simultaneously used for state estimation, combining two functions into one unified process that occurs during normal operation.
Data Source
AI summary
The objective of the present invention is to provide a technology capable of estimating a battery condition in conjunction with charging/discharging operations of a battery, without employing dedicated equipment for estimating the condition of the battery. A battery management device according to the present invention identifies a first period and a subsequent second period in a rest period after a battery finishes discharging or charging, and uses an output voltage difference in the second period to estimate the condition of the battery (see FIG. 1).