Battery Cell Electrolyte-Packing Ratio for Energy Density and Cycle Life
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Solution Overview
Problem
Existing battery technologies face a challenge in concurrently achieving high energy density and high cycle performance, as increasing energy density often leads to a decline in cycle performance.
Innovation Solution
The proposed solution involves a battery cell design where the electrolyte retention coefficient (a) and packing fraction (b) satisfy the relationship 2≤a/b≤3, with the electrolyte retention coefficient in units of g/Ah, to optimize the balance between energy density and cycle performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the energy density of the battery is increased, then the energy storage capacity is improved, but the cycle performance deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the electrolyte retention coefficient (a) and packing fraction (b) to satisfy the relationship 2≤a/b≤3. This quantitative parameter optimization enables the battery to achieve high energy density while maintaining high cycle performance, directly resolving the technical contradiction between energy density and cycle performance
2Quantity of substance
If the packing fraction is increased to improve energy density, then the energy storage is enhanced, but the electrolyte retention may be compromised affecting cycle life
Solution Approach 1:
The patent optimizes the relationship between electrolyte retention coefficient (a) and packing fraction (b) within the range 2≤a/b≤3, ensuring that as packing fraction increases for higher energy density, the electrolyte retention coefficient is adjusted proportionally to maintain adequate electrolyte retention and cycle performance
Data Source
AI summary
A battery cell includes a housing, an electrode assembly, and an electrolyte solution. An accommodation cavity is formed in the housing. The electrode assembly is disposed in the accommodation cavity. The electrolyte solution is disposed in the accommodation cavity. An electrolyte retention coefficient a falls within a value range of 1.4 g/Ah to 2.97 g/Ah, and a packing fraction b of the battery cell falls within a value range of 80% to 99%.