Dual-Battery Vehicle Power Control for High-Current Load Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vehicle battery systems lack efficient management of high power and high capacity batteries, leading to suboptimal performance and potential battery deterioration when charged and discharged at varying current rates.
Innovation Solution
A vehicle driving system comprising a high power battery and a high capacity battery, managed by a controller that prioritizes charging and discharging based on state of charge and power requirements, using relays and sensors to optimize energy distribution and prevent excessive current flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the high capacity battery is used for both high power and high capacity requirements, then the battery system can be simplified, but the battery lifespan deteriorates due to excessive current flow
Solution Approach 1:
The patent divides the battery system into two separate battery packs: a high power battery pack optimized for high current discharge (e.g., acceleration) and a high capacity battery pack optimized for energy storage (e.g., cruising). This segmentation allows each battery to operate within its optimal current range, preventing the high capacity battery from suffering lifespan deterioration due to excessive current while maintaining system functionality.
2Productivity
If the high power battery is charged at high current rates, then charging speed is improved, but the battery deterioration accelerates
Solution Approach 1:
The patent applies different charge/discharge current rate characteristics to different battery packs based on their specific functions. The high power battery pack is designed to accept and deliver high current rates (e.g., 5C or higher) for rapid charging and acceleration, while the high capacity battery pack operates at lower current rates to preserve lifespan. This local quality differentiation resolves the contradiction between charging speed and battery deterioration.
3Power
If the high capacity battery supplies high current for high power output, then power demand is met, but the battery performance deteriorates
Solution Approach 1:
The patent implements dynamic control of battery selection based on real-time power demands and battery states. The control unit dynamically switches between the high power battery pack and high capacity battery pack depending on the required power output level. For high power demands (e.g., acceleration), the high power battery pack is activated; for lower power demands (e.g., cruising), the high capacity battery pack supplies power. This dynamic allocation ensures high power output when needed while protecting the high capacity battery from performance-deteriorating high current discharge.
Data Source
AI summary
A vehicle driving system includes a drive motor-generator connected to a first battery and a second battery via respective relays, a power receiving unit connected to the first battery and the second battery via respective relays and connected to an external power supply, and a controller. The controller is configured to, when the power receiving unit is connected to the external power supply, cause the first battery to be charged if the state of charge of the first battery is lower than a predetermined SOC and cause the second battery to be charged if the state of charge of the first battery is higher than or equal to the predetermined SOC.