Battery Pack Equalization Using High Voltage Turning Point Detection
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Solution Overview
Problem
Existing power battery pack equalization strategies require full charging, fail to accurately predict State of Charge (SOC) misalignment, and cannot complete alignment in a single instance, leading to shortened service life and inefficient utilization.
Innovation Solution
A method and device that obtain the high voltage turning point of the charging curve of each cell, calculate cell capacity, and equalize cells based on maximum and average capacities, eliminating the need for full charging and enabling accurate SOC alignment in a single step.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If top-aligned equalization strategy is used, then high-voltage cells are aligned by discharging, but the battery pack must be fully charged first, increasing time consumption
Solution Approach 1:
The patent performs preliminary analysis of the charging curve to identify the high voltage turning point before equalization is needed. By pre-calculating the capacity based on the turning point characteristics, the system prepares equalization parameters in advance, eliminating the need to wait for full charging completion before starting equalization operations.
2Ease of operation
If equalization is based on voltage difference threshold, then simple control is achieved, but SOC misalignment cannot be accurately predicted
Solution Approach 1:
The patent replaces the simple voltage threshold comparison method with an analysis based on charging curve characteristics. By identifying the high voltage turning point and calculating capacity from the curve's geometric features, the system achieves accurate SOC prediction without complex mechanical or electronic measurement systems.
3Device complexity
If voltage difference threshold triggers equalization, then control simplicity is maintained, but alignment cannot be completed in one time for large SOC misalignment
Solution Approach 1:
The system performs preliminary calculation of the required equalization capacity by analyzing the charging curve's high voltage turning point. This pre-calculation determines the exact equalization duration and parameters needed, allowing the system to complete alignment in a single operation even for large SOC misalignments, rather than requiring multiple iterative adjustments.
Data Source
AI summary
Disclosed are an automobile, and a power battery pack equalization method and device, the method comprises the following steps: acquiring a high voltage inflection point of the charging curve of a battery cell of the power battery pack and acquiring the capacity of the battery cell according to the high voltage inflection point of the battery cell, and equalizing the battery cell according to the capacity of the battery cell. Hence, equalization management of the power battery pack can be realized, thereby improving the use ratio of the power battery pack and prolonging the service life of the power battery pack.