Lead-Acid Battery Deterioration Estimation Using Multi-Parameter History
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Solution Overview
Problem
Existing methods fail to accurately estimate the deterioration of lead-acid batteries due to various factors such as softening of positive active material, corrosion of positive electrode grids, sulfation of negative electrodes, and shrinkage, which can lead to unexpected battery failure.
Innovation Solution
An estimation device and method that derive and analyze historical data of current, voltage, and temperature to specify physical quantities like positive active material amount, surface area, bulk density, lead sulfate accumulation, corrosion, and resistivity of electrode plates, using relationships to estimate the degree of battery deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple physical quantities are specified to accurately estimate deterioration, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent segments the deterioration estimation into multiple independent physical quantity specifications (positive active material amount, specific surface area, bulk density, corrosion amount, resistivity) that can be calculated separately and then integrated. Each physical quantity corresponds to a specific deterioration factor, allowing modular analysis and reducing overall system complexity while maintaining comprehensive measurement precision.
Solution Approach 2:
The patent uses a single history data set (current, voltage, temperature) that serves multiple functions: it is used to derive all nine different physical quantities related to various deterioration factors. This multi-functional use of the same input data reduces the need for separate measurement systems for each deterioration aspect, thereby reducing device complexity while improving comprehensive estimation accuracy.
2Measurement precision
If comprehensive history data is collected to specify multiple physical quantities, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The patent continuously collects history data (current, voltage, temperature) during normal battery operation without interruption. This continuous data collection allows all physical quantities to be derived from the same ongoing data stream, eliminating the need for separate measurement sessions and reducing total time loss while maintaining high measurement precision through comprehensive data coverage.
Solution Approach 2:
The patent performs preliminary derivation of history data from basic measurements (current, voltage, temperature) before using it to specify multiple physical quantities. This preliminary preparation of processed history data allows rapid specification of all nine physical quantities without repeating raw data collection, thereby reducing time loss while maintaining measurement precision.
Data Source
AI summary
An estimation device includes: a derivation unit (31) configured to derive a derivation history based on a current, a voltage of a lead-acid battery and a temperature of the lead-acid battery; a specifying unit (31) configured to specify one or more physical quantities based on the derivation history, and one or more relationships selected from a first relationship between a first history and an amount of positive active material, a second relationship between a second history and a specific surface area of a positive electrode material, a third relationship between a third history and bulk density of the positive active material, a fourth relationship between a fourth history and positive active material particles in a cluster size, a fifth relationship between a fifth history and a cumulative amount of lead sulfate of a negative electrode material, a sixth relationship between a sixth history and a specific surface area of the negative electrode material, a seventh relationship between a seventh history and a corrosion amount of a positive electrode grid, an eighth relationship between an eighth history and resistivity of a positive electrode plate, and a ninth relationship between a ninth history and resistivity of a negative electrode plate; and an estimation unit (31) configured to estimate a degree of deterioration of the lead-acid battery.