Battery Cooling Controller With Degradation-Based Restriction Logic
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Solution Overview
Problem
Existing secondary battery management systems for vehicles fail to effectively retard high-rate degradation of lithium-ion batteries, leading to reduced fuel efficiency and vehicle performance due to premature power discharge restrictions.
Innovation Solution
A secondary battery management device with a cooling mechanism and controller that restricts cooling and power when high-rate degradation damage exceeds predefined thresholds, allowing for stepwise increases in cooling restriction as damage increases, and prioritizes cooling when material degradation damage is high.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cooling of the secondary battery is restricted when high-rate degradation damage reaches a threshold, then the progress of high-rate degradation is retarded, but fuel efficiency or vehicle performance is reduced due to premature power discharge restriction
Solution Approach 1:
The controller performs preliminary cooling restriction before high-rate degradation damage exceeds the threshold by monitoring the evaluation value that predicts future degradation. This advance action prevents degradation from reaching critical levels while maintaining vehicle performance by avoiding premature power discharge restriction.
Solution Approach 2:
The controller continuously monitors the evaluation value of high-rate degradation damage and dynamically adjusts cooling restriction and power discharge decisions based on real-time feedback. This closed-loop control optimizes the balance between retarding degradation and maintaining vehicle performance.
2Reliability
If discharge power is restricted when high-rate degradation damage exceeds the threshold, then the progress of high-rate degradation is retarded, but fuel efficiency is reduced
Solution Approach 1:
The system performs preliminary power discharge restriction before high-rate degradation damage exceeds the threshold by monitoring the evaluation value. This advance restriction prevents degradation from reaching critical levels while minimizing fuel efficiency loss by maintaining normal operation as long as possible.
Solution Approach 2:
The controller dynamically adjusts discharge power restriction based on the real-time evaluation value of high-rate degradation damage. This dynamic control optimizes the balance between retarding degradation and maintaining fuel efficiency by adapting restriction levels to actual battery conditions.
Data Source
AI summary
A battery management device for a battery that is incorporated in a vehicle includes a cooling fan configured to cool the battery and a controller configured to control the cooling fan. The controller is configured to calculate an amount of high-rate degradation damage which is an amount of degradation damage to the battery caused by high-rate charge or discharge, and is configured to restrict cooling of the battery by the cooling fan when the amount of high-rate degradation damage has reached or exceeded a predefined cooling restriction starting threshold, more strictly than when the amount of high-rate degradation damage is less than the cooling restriction starting threshold.