Dual Battery Modules for Fast Charging and Cycle Life
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Solution Overview
Problem
Current power supply systems for vehicles, particularly those using lithium-ion batteries, face challenges with cycle life degradation due to fast charging and regenerative energy storage efficiency, leading to reduced travel distances and performance limitations in electric and hybrid vehicles.
Innovation Solution
A power supply system comprising two battery modules: a first nonaqueous electrolyte battery with a carbonaceous material as the negative electrode and a second nonaqueous electrolyte battery with a lithium ion absorbing potential of 0.4V or more and a positive electrode of lithium metallic oxide, optimized for charging depth and current density to enhance fast charging and discharge performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If fast charging is performed to improve charging speed, then charging time is reduced, but cycle life degradation occurs
Solution Approach 1:
The patent divides the battery system into two separate battery modules: a first battery module using carbonaceous material for high-rate charging/discharging operations, and a second battery module using lithium-titanium oxide for stable long-term cycling and regenerative energy storage. This segmentation allows each battery type to operate in its optimal performance range, resolving the contradiction between fast charging speed and cycle life reliability.
2Power
If output power is increased to improve accelerating performance, then acceleration capability is enhanced, but discharge capacity decreases
Solution Approach 1:
The patent segments the power delivery function between two battery modules: the first battery module (carbonaceous material) handles high-power output requirements for acceleration, while the second battery module (lithium-titanium oxide) maintains discharge capacity for sustained energy supply. This allows the system to achieve high accelerating performance without sacrificing overall discharge capacity.
3Loss of energy
If regenerative energy storage efficiency is improved, then energy recovery is enhanced, but cycle life degradation occurs
Solution Approach 1:
The patent assigns regenerative energy storage specifically to the second battery module using lithium-titanium oxide, which has superior cycle life characteristics. This segmentation allows efficient energy recovery to be achieved without the cycle life degradation that would occur in carbonaceous material batteries subjected to repeated fast charging from regenerative braking.
4Device complexity
If a single battery type is used to simplify the system, then device complexity is reduced, but performance limitations occur
Solution Approach 1:
The patent segments the battery system into two specialized modules with distinct functions: the first module optimized for high-rate charging/discharging and the second module optimized for stable cycling and regenerative energy storage. While this increases device complexity compared to a single-battery system, it enables superior performance adaptability across different operating conditions including fast charging, regenerative braking, and sustained power delivery.
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 system improves cycle performance and extends travel distance by efficiently managing charging and discharging processes, reducing degradation and maintaining high energy regeneration and accelerating performance.
Implementation Method 1
a first nonaqueous electrolyte battery comprising a positive electrode and a negative electrode containing a carbonaceous material; and a second nonaqueous electrolyte battery comprising a negative electrode containing a negative electrode active material
Data Source
AI summary
A power supply system includes a first battery module and a second battery module. The first battery module comprises a first nonaqueous electrolyte battery comprising a negative electrode containing a carbonaceous material. The second battery module comprises a second nonaqueous electrolyte battery comprising a negative electrode and a positive electrode. The negative electrode contains a negative electrode active material that has a lithium ion absorbing potential of 0.4V (vs. Li/Li+) or more and an average particle diameter of 1 μm or less. The positive electrode contains lithium metallic oxide represented by LixCoyM1−yO2. The second battery module is chargeable in a range of 20 to 80% of charging depth so that a charging current density (A/kg) of the second nonaqueous electrolyte battery becomes higher that that of the first nonaqueous electrolyte battery.