Parallel Battery Power Supply with Dual-Path Voltage Control
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Solution Overview
Problem
In power supply systems with both lead-acid and lithium-ion batteries, voltage increases requested by electrical loads cannot be quickly met without disconnecting the lithium-ion battery, which can degrade the lead-acid battery's durability.
Innovation Solution
A power supply system with a lead-acid battery and a lithium-ion battery connected in parallel, using two paths with a first path for direct connection and a second path with an electrical resistance element, allowing the system voltage to be quickly increased by switching between paths without disconnecting the lithium-ion battery, utilizing a control unit to manage the alternator and switches based on voltage requests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lithium-ion battery is connected to the electrical load and charged before voltage increase, then the battery can be protected, but the system voltage cannot be quickly increased
Solution Approach 1:
The patent divides the connection path into two separate paths: a first path for normal operation and charging, and a second path for rapid voltage increase. This segmentation allows the system to choose different operational modes depending on the situation, resolving the contradiction between protecting the battery and quickly increasing voltage.
Solution Approach 2:
The patent introduces a third terminal and switching device as intermediaries between the lithium-ion battery and the electrical load. These intermediaries enable flexible connection and disconnection, allowing the system to rapidly increase voltage by switching to the second path without directly disconnecting the battery, thus protecting the battery while achieving fast voltage response.
2Speed
If the lithium-ion battery is disconnected to quickly increase system voltage, then voltage can be increased rapidly, but the battery cannot be easily reconnected and lead-acid battery durability degrades
Solution Approach 1:
By segmenting the connection into two paths with a third terminal, the system can switch to the second path for rapid voltage increase without completely disconnecting the lithium-ion battery. The battery remains connected through the third terminal, enabling easy reconnection and maintaining its role in power supply, thus protecting lead-acid battery durability.
Solution Approach 2:
The third terminal acts as an intermediary that allows the lithium-ion battery to remain connected to the system even when the second switch is activated for rapid voltage increase. This intermediary connection prevents complete disconnection, making reconnection straightforward and maintaining the battery's protective function.
3Device complexity
If a single path is used for battery connection, then the system is simpler, but voltage cannot be quickly increased without disconnecting the battery
Solution Approach 1:
The patent divides the single connection path into two parallel paths with a third terminal, creating a segmented architecture. This segmentation enables the system to achieve rapid voltage increase by switching to the second path while maintaining relatively simple control logic through the switching device, balancing complexity and performance.
Solution Approach 2:
The patent introduces dynamic switching capability between two paths based on operational requirements. The switching device dynamically connects or disconnects the second path depending on whether rapid voltage increase is needed, allowing the system to adapt its complexity to the situation while achieving fast voltage response when required.
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
Enables rapid system voltage increase in response to load requests without disconnecting the lithium-ion battery, thereby maintaining battery durability and efficiently managing energy distribution.
Implementation Method 1
an electrical resistance element provided on the second path and having a resistance value greater than a harness resistance of the first path
Data Source
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AI summary
A power supply system includes two secondary batteries having different charge and discharge characteristics and is mountable on a vehicle. The power supply system comprising: a lead-acid storage battery connected to an electrical load; a lithium-ion storage battery connected to the electrical load in parallel with the lead-acid storage battery via two paths being a first path and a second path; a power generator capable of charging the lead-acid storage battery and the lithium-ion storage battery; a first switch provided on the first path; a second switch provided on the second path; an electrical resistance element provided on the second path and having a resistance value greater than a harness resistance of the first path; and a control unit configured to control on/off of the power generator and perform on/off control of the first and second switches according to a voltage increase request from the electrical load.