EV Battery BMS Grading for Fast Reuse and Recycling Decisions
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Solution Overview
Problem
The growing number of waste batteries from electric vehicles poses a significant environmental risk due to their hazardous contents, and existing recycling methods are cumbersome and inefficient, leading to low owner interest and a lack of effective recycling platforms.
Innovation Solution
A battery management system (BMS) that evaluates battery condition using log data and additional electrical/chemical tests to quickly and accurately determine a battery's reuse or recycle grade, enabling faster and more efficient trading through an online platform.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a complicated and time-consuming battery evaluation process is performed during electric vehicle scrapping, then measurement precision of battery condition is improved, but loss of time and productivity are worsened
Solution Approach 1:
The patent applies preliminary action by collecting and analyzing battery log data during the vehicle's operational life before scrapping. The BMS continuously monitors and stores charging/discharging cycles, temperature, voltage, and current data, so that when the vehicle reaches end-of-life, the evaluation can be performed quickly using pre-collected data without requiring extensive testing at the scrapping stage.
Solution Approach 2:
The patent replaces mechanical/physical evaluation methods (disassembly, visual inspection, chemical tests) with electronic data analysis. Instead of physically examining battery components, the system uses the BMS to retrieve and analyze digital log data, substituting complex mechanical evaluation processes with efficient computational analysis.
2Measurement precision
If comprehensive battery evaluation including disassembly and chemical tests is performed, then measurement precision is improved, but device complexity and ease of operation are worsened
Solution Approach 1:
The patent extracts only the essential evaluation data needed for battery grading from the complete set of BMS log data. Instead of performing comprehensive physical and chemical tests, the system identifies and analyzes key parameters (charging/discharging cycles, temperature extremes, voltage fluctuations) that most significantly indicate battery health and remaining life.
Solution Approach 2:
The battery management system performs self-evaluation by automatically analyzing its own stored log data to determine battery condition and grade. The BMS uses its existing monitoring capabilities and stored data to assess battery health without requiring external evaluation equipment or complex testing procedures.
3Reliability
If traditional battery recycling methods are used, then reliability of waste battery handling is improved, but productivity and loss of time are worsened
Solution Approach 1:
The patent applies preliminary action by determining battery grade and suitability for reuse or recycling before the actual recycling process begins. The BMS evaluates battery condition in advance, categorizing batteries into appropriate streams (reuse, recycling, disposal), which streamlines subsequent handling and eliminates the need for re-evaluation during recycling operations.
Solution Approach 2:
The patent inverts the traditional approach by evaluating battery value and condition before disposal rather than treating all end-of-life batteries uniformly. Instead of assuming all used batteries require full recycling processing, the system identifies batteries that may still have useful life or can be efficiently reused, reversing the conventional waste management sequence.
Data Source
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AI summary
A method for controlling a battery of an electric vehicle (EV) for trading includes collecting, by a battery management system (BMS), a usage history related to charging and discharging of the battery, determining a level of the battery based on the usage history, storing a grade of the battery as a reuse grade in a memory, in response to the level being determined to be a level 1, and changing the reuse grade stored in the memory to a recycle grade, in response to the level being determined to be a level 2.