Vehicle Power Source with Parallel Battery Voltage Control
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Solution Overview
Problem
Existing vehicle power sources with multiple batteries require complex control methods and circuit structures to manage the charge and discharge of lithium ion and lead batteries, leading to increased costs due to the need for dedicated discharge circuits and converters.
Innovation Solution
A vehicle power source system that includes a generator, a lithium ion battery, and a lead battery connected in parallel, with a charge and discharge controller that adjusts the generator's voltage to match the batteries' terminal voltages, allowing for efficient power supply and reducing the need for additional protection circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a lithium ion battery and lead battery are used together in a vehicle power source, then energy efficiency is enhanced through regenerative braking, but the circuit structure becomes complex requiring dedicated discharge circuits and converters
Solution Approach 1:
The patent combines the discharge functions for both lithium ion battery and lead battery into a single shared discharge circuit. The controller intelligently directs discharge current through this common circuit based on battery type and state, eliminating the need for separate dedicated discharge circuits and converters for each battery type.
Solution Approach 2:
The discharge circuit is designed with universal functionality to handle discharge operations for both lithium ion battery and lead battery. The controller adapts the discharge parameters and control strategies based on the connected battery type, allowing one circuit to serve multiple purposes without requiring type-specific hardware.
2Reliability
If terminal voltage of lithium ion battery is set lower than lead battery, then charge-discharge operation becomes possible, but instantaneous voltage drop protection load must be coupled to dedicated discharge circuit
Solution Approach 1:
The controller acts as an intermediary between the discharge circuit and the battery system. It monitors the connected battery type and adjusts discharge control parameters accordingly, mediating the interaction between the universal discharge circuit and different battery chemistries to ensure reliable operation without requiring complex external protection circuits.
Solution Approach 2:
The discharge control parameters are made dynamic and adaptive based on the connected battery type. The controller automatically adjusts voltage thresholds, current limits, and protection strategies in real-time, transforming a static control system into a dynamic one that adapts to different operational conditions without hardware changes.
3Adaptability or versatility
If dedicated discharge circuit and converter are incorporated, then lithium ion battery charge-discharge is enabled, but costs of vehicle power source increase
Solution Approach 1:
The patent merges the converter functionality into the existing discharge circuit architecture, eliminating the need for separate dedicated converter components. The discharge circuit is designed to inherently support both battery types through intelligent control, reducing component count and manufacturing complexity while maintaining full battery compatibility.
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
This configuration simplifies the power source system, reduces costs by eliminating the need for dedicated discharge circuits, and enhances energy efficiency by optimizing the charging and discharging of both battery types without compromising their performance.
Implementation Method 1
a generator (16) coupled to the engine
Implementation Method 2
a first power storage (27) coupled to the generator; a second power storage (28) coupled, in parallel with the first storage, to the generator
Data Source
AI summary
A vehicle power source includes: a generator coupled to an engine; a first power storage coupled to the generator; a second power storage coupled, in parallel with the first storage, to the generator, in which a terminal voltage of the second power storage is lower than a terminal voltage of the first power storage; and a charge and discharge controller that controls a generated voltage of the generator and controls charge and discharge of the first power storage. The charge and discharge controller raises the generated voltage to a voltage higher than the terminal voltage of the first power storage, to cause power supply from the generator to the first power storage. The charge and discharge controller lowers the generated voltage to a voltage lower than the terminal voltage of the first power storage, to cause power supply from the first power storage to an electric load.