Used Secondary Battery Leveling for Uniform Degradation Matching
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Solution Overview
Problem
When reconfiguring assembled batteries using multiple used secondary batteries, the varying degradation states lead to performance limitations, as the most advanced degraded battery further degrades, affecting the overall battery performance.
Innovation Solution
A characteristic leveling method that assigns identification information, measures intrinsic parameters, calculates degradation degrees, determines a target degradation state, and adjusts the aging conditions for each battery to match their degradation levels, ensuring they are in almost the same state for reconfiguration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple used secondary batteries with varying degradation states are used for reconfiguration, then the quantity of batteries available for reconfiguration increases, but the performance of the assembled battery is limited by the most degraded battery and further degradation occurs
Solution Approach 1:
The patent applies parameter changes by adjusting the degradation state parameter of batteries through controlled aging processes. By measuring intrinsic parameters and calculating degradation degrees, the system determines target degradation degrees and applies specific aging conditions (temperature, humidity, charge-discharge cycles) to transform batteries into a uniform degradation state, resolving the performance limitation caused by varying degradation levels
Solution Approach 2:
The patent implements preliminary action by performing characteristic leveling (aging treatment) on batteries before they are assembled into the assembled battery. This preliminary aging process ensures that all batteries reach a uniform degradation state in advance, preventing future performance issues and further degradation during operation
2Ease of operation
If a simple threshold-based AC internal resistance measurement is used, then the ease of operation increases, but the manufacturing precision of degradation assessment decreases
Solution Approach 1:
The patent applies segmentation by dividing the degradation assessment into multiple independent measurement components: AC internal resistance, impedance characteristics, capacity, and voltage. Each parameter is measured and evaluated separately, then integrated to calculate a comprehensive degradation degree, providing both operational simplicity and assessment precision
Solution Approach 2:
The patent implements universality by creating a multi-functional assessment system that uses multiple measurement methods (electrical resistance, impedance, capacity testing) to evaluate battery degradation. This universal approach ensures accurate degradation assessment across different battery types and states while maintaining ease of operation through standardized procedures
Data Source
AI summary
A parameter measurement unit measures intrinsic parameters of a plurality of used secondary batteries. A degradation degree calculation unit calculates degradation degrees of the plurality of used secondary batteries from the intrinsic parameter. A target degradation degree determination unit determines a target degradation degree from the degradation degrees of the plurality of used secondary batteries. An aging condition determination unit determines aging conditions of the plurality of used secondary batteries using the degradation degrees of the plurality of used secondary batteries and the target degradation degree. The aging processing unit performs aging processing on the plurality of used secondary batteries under the aging condition for each of the plurality of used secondary batteries.