Artificial Graphite Battery Cell Sizing for Fast Charging and Cycle Life
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Solution Overview
Problem
Current secondary batteries face challenges in maintaining higher energy density while achieving better electrochemical properties such as fast charging performance and longer cycle life.
Innovation Solution
The secondary battery incorporates an electrode assembly with a negative electrode plate made of artificial graphite containing secondary particles, and the cell is designed to meet specific size parameters, ensuring optimal energy density and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the energy density of the secondary battery is increased, then the storage capacity is improved, but the fast charging performance deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the particle size distribution of graphite (Dv10-Dv90 range), controlling secondary particle morphology, and adjusting cell dimensions (a and b parameters) to achieve a balance between energy density and fast charging performance. These parameter optimizations enable both high capacity and rapid charge acceptance.
2Quantity of substance
If the energy density of the secondary battery is increased, then the storage capacity is improved, but the cycle life deteriorates
Solution Approach 1:
The patent employs parameter changes through precise control of graphite particle size distribution (Dv10-Dv90), secondary particle formation, and cell dimensional parameters (a and b). These optimized parameters enable the battery to maintain high energy density while achieving extended cycle life through improved structural stability and reduced degradation.
3Quantity of substance
If the cell size is increased, then the energy density is improved, but the manufacturing precision becomes more difficult to maintain
Solution Approach 1:
The patent applies parameter changes by defining specific ranges for cell dimensions (parameter a and parameter b) that optimize energy density while remaining within manufacturable tolerances. The standardized parameter ranges enable consistent production quality across different cell sizes.
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
This design results in a secondary battery with higher energy density, improved fast charging performance, longer cycle life, and better high-temperature storage performance.
Implementation Method 1
Secondary batteries are reversibly charged and discharged mainly by the reciprocating movement of active ions between the positive and the negative electrodes
Data Source
AI summary
This application discloses a secondary battery and an apparatus containing the secondary battery. The secondary battery secondary battery includes an electrode assembly including a cell and tabs extending from the cell, the cell includes a negative electrode plate, the negative electrode plate includes a negative current collector and a negative electrode film arranged on at least one surfaces of the negative current collector and including a negative active material, wherein the negative active material includes artificial graphite including secondary particles; and the cell satisfies 5 cm≤0.5×√{square root over (a2+b2)}≤15 cm, and a≤15 cm, wherein a is the maximum size of the cell in the direction that the tabs extend, in cm; and b is the maximum size of the cell in a direction perpendicularly intersecting with the direction that the tabs extend, in cm.