Dual Battery Circuit With SOC-Based Switching for Vehicles
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Solution Overview
Problem
Existing technologies face challenges in effectively controlling dual battery packs composed of power-type and energy-type battery packs based on their state of charge (SOC) values, which is crucial for efficient energy management in vehicles.
Innovation Solution
A battery circuit that includes a power supply terminal, a power-type battery pack, an energy-type battery pack, a voltage transformation unit, switches, a grounding terminal, and a control unit. The control unit manages the switches to control the battery packs based on their SOC values, implementing specific control rules to maintain optimal SOC levels and facilitate efficient charging and discharging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dual battery packs are used to provide both power and energy storage, then vehicle performance and energy efficiency are improved, but control complexity increases due to need to manage different SOC values
Solution Approach 1:
The battery system is segmented into two distinct battery packs with different functions: a power-type battery pack for high-power output and an energy-type battery pack for energy storage. Each battery pack is managed independently with separate control strategies based on their respective SOC values, allowing simplified individual control while achieving complex system-level objectives through modular segmentation
Solution Approach 2:
The control system dynamically adjusts the working mode between series and parallel connections based on real-time SOC values of both battery packs. When the power-type battery SOC is high, the system operates in series mode; when it drops below a threshold, it switches to parallel mode for charging. This dynamic adaptation simplifies control by using clear SOC thresholds to determine operational states
2Adaptability or versatility
If switches are added to control battery connections based on SOC values, then energy management flexibility is improved, but device complexity increases
Solution Approach 1:
The first switch serves multiple functions: it controls the connection between the power supply terminal and the power-type battery pack, manages the series/parallel configuration switching, and participates in both charging and discharging pathways. This multi-functionality reduces the total number of switches needed while maintaining energy management flexibility
Solution Approach 2:
The voltage transformation unit acts as an intermediary component that enables flexible energy management between the two battery packs with different voltage ratings. It mediates the voltage mismatch when switching between series and parallel configurations, allowing the control system to achieve flexible energy distribution without requiring complex voltage matching circuitry
3Loss of energy
If SOC-based control rules are implemented, then energy transfer efficiency is improved, but control precision requirements increase
Solution Approach 1:
Instead of requiring precise SOC control at every possible value, the system uses threshold-based control with predefined SOC ranges. The power-type battery is maintained within a specific SOC range (e.g., 20%-80%) rather than targeting exact values, and switching decisions are made based on whether SOC crosses defined thresholds. This partial control approach reduces measurement precision requirements while maintaining energy transfer efficiency
Solution Approach 2:
The control unit continuously monitors the SOC values of both battery packs and provides feedback to adjust the switching states and control rules. This closed-loop feedback mechanism compensates for SOC measurement uncertainties by dynamically adjusting control decisions based on real-time SOC trends, ensuring efficient energy transfer even with limited measurement precision
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
The battery circuit effectively manages the dual battery packs by adjusting their SOC values according to predefined thresholds, ensuring efficient energy transfer, stable discharging, and optimal vehicle performance.
Implementation Method 1
a voltage transformation unit connected between the negative electrode of the first battery pack and the second terminal of the first switch
Data Source
AI summary
A battery circuit (e.g., in a vehicle) includes a power supply terminal, a first battery pack, a second battery pack of a different type from the first battery pack, a voltage transformation unit, a first switch, a second switch, a grounding terminal, and a control unit. The first battery pack is connected to the power supply terminal and the second battery pack. The second battery pack is connected to the grounding terminal. The first switch is connected to the power supply terminal, the second switch, and the control unit. The second switch is connected to the grounding terminal and the control unit. A voltage transformation unit is connected between the first battery pack and the first switch. The control unit is configured to control closing or opening of the first and second switches according to at least one state-of-charge value of the first and second battery packs.