Dynamic Voltage Range Adjustment for Lithium Ion Battery Degradation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Lithium ion batteries with active materials like silicon and SiO experience significant degradation due to expansion and contraction during charge/discharge cycles, leading to poor cycle characteristics despite the use of binders to suppress degradation.
Innovation Solution
A charge/discharge control method and device that acquires battery information, determines the degradation state, and adjusts the voltage range for charge/discharge based on this information, using a battery information acquisition unit, degradation state determination unit, and voltage range change unit to manage the lithium ion battery's operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If active material of large capacity (silicon, SiO) is used to achieve high output and high energy density, then energy density is improved, but the active material degrades due to expansion and contraction during charge/discharge cycles
Solution Approach 1:
The patent changes the operating voltage parameters by dynamically adjusting the charge/discharge voltage range based on battery degradation state. When degradation is detected, the system reduces the upper voltage limit and/or increases the lower voltage limit, thereby operating the battery within a reduced voltage range that minimizes mechanical stress on the active material during charge/discharge cycles.
2Strength
If binders with high coatability and adhesion are used to suppress degradation of active material, then adhesion is improved, but degradation cannot be completely suppressed and cycle characteristic remains poor
Solution Approach 1:
The patent implements a feedback mechanism where the battery management system continuously monitors battery information (voltage, current, temperature, cycle count) to determine the degradation state. Based on this feedback, the system dynamically adjusts the charge/discharge voltage range to compensate for degradation and extend battery life.
Data Source
AI summary
In a charge/discharge control method of a lithium ion battery having a negative electrode active material and connected to a charge/discharge control device, battery information regarding a charge/discharge state of the lithium ion battery is acquired by the charge/discharge control device, a degradation state of the lithium ion battery is determined on the basis of the battery information, by the charge/discharge control device, and a voltage range for charge/discharge of the lithium ion battery is changed on the basis of a determination result of the degradation state, by the charge/discharge control device.