Secondary Battery Temperature Control for Degradation Suppression
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Solution Overview
Problem
Secondary batteries face challenges in suppressing degradation, particularly due to temperature-related factors, where conventional systems fail to accurately manage degradation factors like calendar and cycle degradation, leading to uneven performance and reduced lifespan.
Innovation Solution
A degradation suppression system that includes a control unit to acquire and analyze usage history, estimate degradation amounts, identify contributing factors, and adjust the battery temperature within a predetermined range to minimize degradation, using a refrigeration cycle device and inverter to maintain optimal conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional temperature management systems are used, then basic cooling function is provided, but degradation factors like calendar and cycle degradation are not accurately managed
Solution Approach 1:
The patent segments degradation management into distinct components: calendar degradation management and cycle degradation management. The control unit separately estimates and manages each degradation type based on different parameters (time/temperature for calendar, charge-discharge cycles for cycle), allowing precise control without requiring a completely complex new system architecture.
Solution Approach 2:
The system implements feedback mechanisms by continuously monitoring battery temperature, charge-discharge cycles, and degradation estimates. The control unit adjusts cooling control based on real-time degradation status and predicted future degradation, creating a closed-loop system that improves reliability through adaptive control.
2Temperature
If aggressive cooling control is applied, then temperature is maintained at optimal levels, but battery performance and lifespan may be compromised due to excessive temperature fluctuations
Solution Approach 1:
The system performs preliminary action by predicting future degradation trends based on current temperature and usage patterns. The control unit proactively adjusts cooling control before excessive degradation occurs, preventing temperature-related damage while avoiding aggressive cooling that could cause thermal shock or unnecessary temperature fluctuations.
Solution Approach 2:
The cooling control is made dynamic by continuously adapting to changing battery conditions. The control unit adjusts cooling intensity based on real-time temperature, degradation state, and predicted degradation, rather than applying fixed aggressive cooling. This dynamic approach maintains temperature control while preserving battery lifespan.
3Measurement precision
If multiple degradation factors are monitored and managed, then degradation suppression accuracy is improved, but control system complexity increases
Solution Approach 1:
The patent divides degradation monitoring into separate modules: calendar degradation estimation (based on time and temperature) and cycle degradation estimation (based on charge-discharge cycles). This segmentation allows the system to accurately track multiple degradation factors without requiring a monolithic complex control system, as each factor can be managed independently.
Solution Approach 2:
The control unit is designed with multi-functionality, handling both calendar and cycle degradation management, temperature control, and cooling system coordination through a single integrated component. This universal approach improves measurement precision across multiple parameters while avoiding the complexity of multiple separate control systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively suppresses battery degradation by accurately managing temperature and accounting for multiple degradation factors, thereby extending the lifespan and maintaining performance of secondary batteries in vehicles.
Implementation Method 1
using a refrigeration cycle device and inverter to maintain optimal conditions
Implementation Method 2
adjust the battery temperature within a predetermined range to minimize degradation
Data Source
AI summary
The degradation suppression system includes a secondary battery, a usage history acquisition unit, a degradation amount estimation unit, a degradation factor identification unit, and a suppression control unit. The usage history acquisition unit acquires usage history information indicating the usage history of the secondary battery. The degradation amount estimation unit estimates the degradation amount of the secondary battery by using the usage history information acquired by the usage history acquisition unit. The degradation factor identification unit uses the usage history information to identify multiple degradation factors relating to the degradation amount, of the secondary battery, estimated by the degradation amount estimation unit. The suppression control unit controls the secondary battery to suppress the secondary battery degradation according to the configuration of degradation factors of the secondary battery degradation.