Battery Charge Control to Prevent High-Temperature Gas Generation
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Solution Overview
Problem
High reactivity secondary battery materials increase energy density but lead to rapid degradation and gas generation when left unused at high temperatures, causing battery pouches to burst and reducing chargeable capacity.
Innovation Solution
A battery management system that monitors temperature, charged amount, and non-used period, and deliberately discharges the battery when these conditions meet preset levels to prevent gas generation, using a monitoring unit, degradation management unit, and control unit to set and enforce discharge levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high reactivity secondary battery material is used to increase energy density, then battery capacity increases, but gas generation increases causing rapid degradation and pouch bursting
Solution Approach 1:
The system performs preliminary action by proactively discharging the battery before degradation occurs. The control unit detects when the battery is in a high-charged state combined with high temperature and extended non-use period, then deliberately discharges it to a safe charge level in advance, preventing gas generation and pouch bursting before they can occur.
Solution Approach 2:
The system implements feedback by continuously monitoring battery state (charge level, temperature, usage history) and using this information to trigger discharge actions. The control unit receives state information, determines whether discharge conditions are met, and adjusts battery charge level accordingly, creating a closed-loop control system that maintains battery stability.
2Use of energy by moving object
If battery is left in highly-charged state at high temperature for extended period, then energy availability is maximized, but degradation phenomenon occurs reducing chargeable amount
Solution Approach 1:
The system performs preliminary action by proactively discharging the battery before degradation occurs. The control unit detects when the battery is in a high-charged state combined with high temperature and extended non-use period, then deliberately discharges it to a safe charge level in advance, preventing gas generation and pouch bursting before they can occur.
Solution Approach 2:
The system implements feedback by continuously monitoring battery state (charge level, temperature, usage history) and using this information to trigger discharge actions. The control unit receives state information, determines whether discharge conditions are met, and adjusts battery charge level accordingly, creating a closed-loop control system that maintains battery stability.
3Measurement precision
If conventional monitoring methods are used to detect degradation, then alarm can be generated, but deterioration is not reversible and battery durability is limited
Solution Approach 1:
The system performs preliminary action by proactively discharging the battery before degradation occurs. The control unit detects when the battery is in a high-charged state combined with high temperature and extended non-use period, then deliberately discharges it to a safe charge level in advance, preventing gas generation and pouch bursting before they can occur.
Solution Approach 2:
The system implements feedback by continuously monitoring battery state (charge level, temperature, usage history) and using this information to trigger discharge actions. The control unit receives state information, determines whether discharge conditions are met, and adjusts battery charge level accordingly, creating a closed-loop control system that maintains battery stability.
Data Source
Figure 1(a)~1(b)
Figure 2
Figure 3(a)~3(b)
AI summary
Provided is a battery management system capable of deliberately discharging a battery to suppress deterioration of the battery due to gas generated in the battery that is left non-used at a high temperature for a long time. The battery management system, which aims to prevent generation of gas in the battery left non-used at a high temperature, is provided to prevent generation of gas in the battery in advance by deliberately discharging the battery to reduce a charged amount of the battery when a temperature, a charged amount, and a non-used period are in a preset level range.