Micro-hybrid Battery Module Using LTO Anode and High Voltage Spinel Cathode
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Solution Overview
Problem
Micro-hybrid battery modules in electric vehicles (xEVs) are heavy and decrease fuel economy due to the use of lead acid batteries, while lithium ion batteries offer better charge acceptance but require complex cooling systems and are not optimized for high power demands.
Innovation Solution
Implementing lithium ion battery modules with titanate-based oxide (LTO) as the anode active material and high voltage spinel (HVS) as the cathode active material, which reduces impedance and allows for fewer cells to achieve the same voltage, thereby decreasing the size and weight of the battery system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If lead acid batteries are used in micro-hybrid battery modules, then the battery system provides sufficient power for engine starting, but the weight increases and fuel economy decreases
Solution Approach 1:
The patent applies parameter changes by transitioning from lead acid battery chemistry to lithium ion battery chemistry, specifically using LTO anode and HVS cathode materials. This chemical parameter change enables the battery to achieve the same power output with significantly reduced weight, directly resolving the contradiction between power provision and weight reduction
2Weight of moving object
If lithium ion batteries are used to reduce weight, then the weight decreases, but complex cooling systems are required
Solution Approach 1:
The patent applies local quality by selecting specific lithium ion battery materials (LTO anode and HVS cathode) that possess inherent thermal stability properties. This localized material selection creates a battery system with improved thermal management characteristics, reducing the need for complex cooling systems while maintaining weight advantages
3Use of energy by moving object
If conventional lithium ion batteries are used, then charge acceptance is improved, but the battery cannot meet high power demands
Solution Approach 1:
The patent applies composite materials by combining LTO (lithium titanate oxide) anode material with HVS (high voltage spinel) cathode material. This composite material system synergistically provides both excellent charge acceptance properties from the LTO and high power output capabilities from the HVS, resolving the contradiction between charge acceptance and power delivery
4Power
If more battery cells are added to increase power output, then the power output increases, but the size and weight increase
Solution Approach 1:
The patent applies parameter changes by utilizing high voltage spinel cathode material that operates at higher voltage potentials. This parameter change in operating voltage allows the battery to achieve the same power output with fewer cells, thereby reducing both the volume and weight of the battery system while maintaining high power capabilities
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 LTO/HVS lithium ion battery modules provide higher power output, reduced weight, and improved fuel efficiency by meeting high power demands without the need for extensive cooling systems, enabling a more compact and lightweight battery system.
Implementation Method 1
Each battery cell includes a anode active material that includes lithium titanate oxide (LTO) and a cathode active material that includes high voltage spinel (HVS)
Data Source
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AI summary
The present disclosure relates to micro-hybrid battery modules (12) that include at least one battery cell (120) having a titanate-based oxide anode active material with spinel structure and a high voltage spinel (LiMn2-xMx04) cathode active material. The battery module may be configured to couple to an energy storage unit (28) to enable the module to be used in start-stop applications.