Li-Ion Battery Integrated Power Management and Scalable Cutoff
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Solution Overview
Problem
Current automotive batteries, particularly lead acid batteries, struggle to meet the high electrical current demands and frequent charge-discharge cycles required by micro-hybrid vehicles, lacking the performance and environmental benefits of lithium-ion (Li-Ion) batteries.
Innovation Solution
A prismatic Li-Ion battery with an integrated power management system and scalable cutoff component, utilizing metal-oxide semiconductor field effect transistors (MOSFETs) for active and passive protection against overcharge, over-discharge, over-temperature, and over-current, allowing for efficient control of external power sources and loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lead acid batteries are used in micro-hybrid vehicles, then the vehicle can be propelled by conventional internal combustion engines, but the battery cannot withstand the frequent charge-discharge cycles and high electrical current demands
Solution Approach 1:
The patent transitions from lead acid battery chemistry to lithium-ion battery chemistry, fundamentally changing the electrochemical parameters of the battery system. This parameter change enables the battery to withstand frequent charge-discharge cycles and deliver high electrical currents required for micro-hybrid applications, directly resolving the reliability and performance contradiction
2Reliability
If lithium-ion batteries are used instead of lead acid batteries, then power-to-weight ratio and cycle life are improved, but the system complexity increases due to the need for integrated power management and cutoff protection
Solution Approach 1:
The patent integrates the power management system and cutoff protection circuitry directly into the battery assembly, merging multiple protective functions into a unified integrated system. This integration reduces the overall system complexity compared to having separate protective devices, while still providing comprehensive protection for the lithium-ion battery cells
Solution Approach 2:
The battery management system automatically monitors cell voltages, temperatures, and charge/discharge currents, and autonomously activates cutoff protection when abnormal conditions are detected. This self-service capability eliminates the need for external monitoring and control systems, reducing overall system complexity while maintaining high reliability
3Reliability
If an integrated power management system is implemented, then charge and discharge cycles are effectively managed, but the device complexity and manufacturing cost increase
Solution Approach 1:
The power management system is designed to perform multiple functions including charge control, discharge management, cell balancing, temperature monitoring, and cutoff protection through a single integrated controller. This multi-functionality reduces the number of separate components needed, thereby reducing device complexity and manufacturing cost while maintaining comprehensive charge-discharge cycle management
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 Li-Ion battery system provides enhanced power-to-weight ratios, longer cycle life, and environmental benefits by effectively managing charge and discharge cycles, ensuring reliable performance in micro-hybrid applications while preventing battery damage.
Implementation Method 1
a cutoff switch circuit within the battery housing and for making and breaking a conductive path between the first voltage terminal of the plurality of battery cells and the first voltage output terminal of the battery housing in response the internal control signal from the battery management system
Data Source
AI summary
The present disclosure relates battery with an integrated power management system and scalable cutoff component, the battery system including a battery housing with first and second voltage output terminals, a plurality of rechargeable battery cells within the battery housing and having first and second voltage terminals; a power management system for generating an external control signal and an internal control signal based upon monitored operating parameters of the plurality of rechargeable battery cells, said external control signal for controlling an external power source and/or an external load, said power management system forming an integral part of the battery system; and a cutoff switch circuit within the battery housing and for making and breaking a conductive path between the first voltage terminal of the plurality of battery cells and the first voltage output terminal of the battery housing in response the internal control signal from the battery management system.