Lithium Battery Module for ISG Systems with 13.6-15.6 V Output
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Solution Overview
Problem
Lead acid batteries used in rechargeable battery modules for Integrated Starter and Generator (ISG) systems have low energy density, poor low-temperature starting characteristics, and reduced cycle-life due to repeated charging and discharging, necessitating a more efficient and durable battery solution.
Innovation Solution
A rechargeable lithium battery module comprising lithium-cobalt-based or lithium-iron-phosphate-based oxide positive active materials and carbon-based negative active materials, connected in series to achieve an output voltage range of 13.6 V to 15.6 V, with optional diodes and resistors for protection and enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If lead acid batteries are used in rechargeable battery modules for ISG systems, then the system can provide basic power supply functionality, but the energy density is low and the volume is large
Solution Approach 1:
The patent changes the chemical composition parameters of the battery from lead acid to lithium-based materials (lithium-cobalt oxide, lithium-nickel-cobalt-manganese oxide, lithium-iron-phosphate). This fundamental parameter change enables higher energy density while reducing the volume required to store the same amount of energy, directly resolving the contradiction between energy density and volume.
2Reliability
If lead acid batteries are used in ISG systems, then the system can operate, but the cycle-life is reduced due to repeated charging and discharging
Solution Approach 1:
The patent employs composite lithium-based materials combining multiple elements (cobalt, nickel, manganese, iron, phosphate) to create positive electrodes with enhanced structural stability and chemical durability. These composite materials resist degradation during repeated charging and discharging cycles, significantly extending the battery's cycle-life and operational reliability compared to conventional lead acid batteries.
3Reliability
If lead acid batteries are used in ISG systems, then the system can provide power, but the low-temperature starting characteristics are poor
Solution Approach 1:
The patent changes the electrochemical parameters of the battery system by using lithium-based materials with lower operating temperatures and different ionic conductivity characteristics. These material parameter changes enable the battery to maintain high discharge performance and starting capability even at low temperatures, overcoming the poor low-temperature characteristics of lead acid batteries.
4Productivity
If lead acid batteries are used in ISG systems, then the system can function, but the charging time is relatively long
Solution Approach 1:
The patent changes the electrochemical kinetics parameters by using lithium-based materials with higher ionic conductivity and faster reaction rates. These parameter changes enable rapid charge acceptance, reducing the time required to recharge the battery and significantly improving charging productivity compared to conventional lead acid systems.
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 lithium battery module provides improved low-temperature discharge characteristics, rapid charge capabilities, and extended cycle-life, outperforming lead acid batteries in the driving voltage region of ISG systems.
Implementation Method 1
a first rechargeable lithium battery cell (41) combined with a second rechargeable lithium battery cell (41), the first rechargeable lithium battery cell (41) including a positive electrode (3) including a first positive active material and a first negative electrode (2) including a first negative active material
Data Source
AI summary
A rechargeable lithium battery module includes a first rechargeable lithium battery cell combined with a second rechargeable lithium battery cell, the first rechargeable lithium battery cell being the same or different than the second rechargeable lithium battery cell, and the rechargeable lithium battery module has an output voltage of about 13.6 V to about 15.6 V.