Dual-Battery Management Modes for Power and Driving Range
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Solution Overview
Problem
The increasing demand for electric vehicles requires batteries that balance high output and long-distance driving capabilities, while also needing to manage batteries with varying properties effectively.
Innovation Solution
A battery management device with fast and slow processing units that determine operation modes based on battery type, allowing for appropriate charging and discharging of high-power and high-capacity batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a battery system uses high-power battery material to achieve high output characteristics, then the maximum output power is improved, but the energy density and driving distance are reduced
Solution Approach 1:
The battery system is divided into two separate battery packs: a high-power battery pack for providing maximum output power during acceleration and high-load conditions, and a high-capacity battery pack for providing sustained energy supply during normal driving and extending driving distance. This segmentation allows each battery type to optimize its specific function without compromise.
Solution Approach 2:
Different battery packs are assigned to different functional roles within the vehicle power system. The high-power battery is positioned to handle peak power demands, while the high-capacity battery handles sustained energy supply. This local quality differentiation optimizes the overall system performance by matching battery characteristics to specific operational requirements.
2Productivity
If the battery management system charges the high-power battery at high current to reduce charging time, then the charging speed is improved, but the battery lifespan and safety are reduced due to overheating and degradation
Solution Approach 1:
The charging current is dynamically adjusted based on real-time monitoring of battery temperature, state of charge, and other parameters. The charging rate varies during the charging process, using higher currents when safe and reducing currents when temperature rises or charge level increases, optimizing both charging speed and battery safety.
Solution Approach 2:
The battery management system continuously monitors charging conditions including temperature, voltage, and current, and uses this feedback to adjust charging parameters in real-time. This closed-loop control prevents overheating and degradation by reducing charging current when limits are approached, while maintaining high charging speeds during safe operating conditions.
3Device complexity
If the battery management system uses a single processing unit to manage both high-power and high-capacity batteries, then the device complexity is reduced, but the control precision and responsiveness to different battery types are insufficient
Solution Approach 1:
The battery management system is divided into separate processing units: a first processing unit dedicated to managing the high-power battery and a second processing unit dedicated to managing the high-capacity battery. Each processing unit is optimized for its specific battery type, enabling precise control and monitoring tailored to the unique characteristics of each battery pack.
Solution Approach 2:
A communication interface acts as an intermediary between the separate processing units and the vehicle control system, coordinating their operations and enabling them to work together as an integrated system while maintaining the benefits of specialized processing for each battery type.
Data Source
AI summary
According to various embodiments, a battery management device including: a fast processing unit configured to process a first charge amount or a first discharge amount of a high-power battery in a fast processing mode to be higher than a second charge amount or a second discharge amount of a high-capacity battery; a slow processing unit configured to process the first charge amount or the first discharge amount of the high-power battery in a slow processing mode to be lower than the second charge amount or the second discharge amount of the high-capacity battery; and a mode determination unit configured to determine the fast processing mode or the slow processing mode according to a mode selection, and determine an operation of the fast processing unit or the slow processing unit according to the determined mode, and a battery management method may be provided.