Battery Swelling Prediction Using Charging Voltage Difference Trends
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Solution Overview
Problem
Existing methods for detecting battery swelling are inaccurate under small external forces and require additional sensors, only providing a binary assessment after swelling occurs, lacking a quantitative description.
Innovation Solution
A method that analyzes the variation data of charging voltage differences and cumulative operating unit values, such as cycle count or usage time, to predict and quantify the swelling state of a battery using regression analysis and threshold comparisons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mechanical methods such as pressure or strain gauges are used to measure battery swelling, then measurement accuracy is improved when the battery is at rest, but the system becomes more complex and requires additional sensors
Solution Approach 1:
The patent replaces mechanical measurement methods (pressure or strain gauges) with an electrical measurement system that uses voltage difference data and regression analysis to determine battery swelling state, thereby eliminating the need for additional mechanical sensors
Solution Approach 2:
The patent introduces voltage difference as an intermediary parameter that indirectly reflects battery swelling state, allowing swelling detection without direct mechanical contact or additional sensors on the battery
2Reliability
If mechanical sensors are used to detect battery swelling, then swelling detection is achieved, but the system can only provide binary assessment after swelling occurs and lacks quantitative description
Solution Approach 1:
The patent implements a feedback mechanism where voltage difference data is continuously collected over time, processed through regression analysis to calculate swelling rates, and used to dynamically assess battery swelling state, providing both detection and quantitative measurement
Solution Approach 2:
The patent transforms the binary swelling detection into a quantitative assessment by changing the measurement parameter from simple presence/absence to swelling rate calculation based on voltage difference variations over time
3Measurement precision
If mechanical methods are used for swelling measurement, then direct swelling detection is achieved, but the system is prone to errors under small external forces
Solution Approach 1:
The patent replaces mechanical measurement systems that are sensitive to external forces with an electrical measurement system based on voltage differences, which are not affected by mechanical external forces applied to the battery
Data Source
AI summary
A method for determining the swelling state of a battery is provided, comprising the following steps: collecting data of multiple charging voltage differences and cumulative operating units of the battery; obtaining the variation data of the current charging voltage difference based on the charging voltage differences and cumulative operating units; acquiring the known relational data between variation data of charging voltage differences and battery swelling states, and determining the swelling state of battery based on the relational data and the variation data of the current charging voltage difference. Accordingly, it is possible to predict whether the battery is at risk of swelling. The method for determining the swelling state of a battery provided by the embodiments of the present invention allows a more convenient prediction of the swelling state of a battery based on the variation data of the charging voltage difference.