Battery Charge Management via Dynamic Voltage Control
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Solution Overview
Problem
Existing battery charging methods for electric and hybrid vehicles face a trade-off between charging time and battery lifetime, with high-voltage charging speeding up the process but potentially degrading the battery, and existing two-phase charging methods do not optimize for both performance and longevity.
Innovation Solution
A method that controls a fast charge phase at increasing voltage until a second voltage value higher than the desired limiting voltage, followed by an absorption phase at decreasing current regulated at a first voltage value, allowing the fast charge phase to be prolonged and reducing the time spent at high voltage to ensure battery durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the battery is charged with a relatively high voltage to speed up the charging process, then the charging time is reduced, but the battery lifetime is degraded
Solution Approach 1:
The patent implements dynamic voltage control during charging, transitioning from a static single-voltage approach to a dynamic multi-stage voltage profile. The charger adjusts voltage in real-time based on battery state, implementing a fast charge phase with increasing voltage followed by an absorption phase at a regulated lower voltage, optimizing both charging speed and battery longevity through adaptive control
Solution Approach 2:
The charging process is divided into two distinct phases: a fast charge phase with increasing voltage to rapidly charge the battery, and an absorption phase at a regulated lower voltage to complete charging without excessive voltage stress. This segmentation allows each phase to be optimized independently for its specific function
2Productivity
If the fast charge phase is prolonged to increase charging rate, then the charging efficiency is improved, but the battery durability is compromised due to extended high voltage exposure
Solution Approach 1:
The system dynamically transitions between charging phases based on real-time voltage monitoring. When the battery voltage reaches a predetermined threshold during the fast charge phase, the system automatically switches to the absorption phase, preventing excessive voltage exposure while maintaining high charging rates during the optimal window
Solution Approach 2:
The charging system continuously monitors battery voltage and uses this feedback to control the charging process. The voltage feedback triggers the transition from fast charge to absorption phase, ensuring the battery receives high voltage only during the optimal charging window before switching to a safer voltage level
Data Source
AI summary
A method for managing the charge of a battery comprising:control of a rapid charging phase at increasing voltage, followed bycontrol of an absorption phase at decreasing current regulated to a first voltage value, and in which the rapid charging phase is controlled until the voltage at the terminals of the battery reaches a second voltage value that is strictly higher than the first voltage value.