Battery Cell Pressurization Pad for Uniform Pressure Distribution
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Solution Overview
Problem
Existing battery cell manufacturing processes for all-solid-state batteries face challenges in applying uniform pressure during clamping, leading to uneven contact between electrodes and electrolytes, which affects initial charge/discharge efficiency and cycle performance.
Innovation Solution
A battery cell pressurization pad comprising multiple layers of pressurization pads with varying firmness and thickness ratios, designed to uniformly apply pressure by stacking first and second pressurization pads with specific compression force deflections (CFD) and thickness relationships, ensuring even contact between electrodes and electrolytes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If clamping pressure is applied to improve contact between electrodes and solid electrolyte, then contact quality is improved, but pressure distribution becomes uneven
Solution Approach 1:
The pressurization pad uses a foam material with a specific density range (0.03 to 0.08 g/cm³) to create non-uniform local properties within the pad structure. This allows different regions of the pad to provide different levels of pressure, compensating for variations in battery cell geometry and ensuring uniform pressure distribution across the entire contact surface while maintaining good electrode-electrolyte contact.
Solution Approach 2:
The invention changes the physical parameters of the pressurization pad by controlling the foam material density within a specific range (0.03 to 0.08 g/cm³) and setting the thickness ratio between the pressurization pad and battery cell between 0.05 to 0.5. These parameter adjustments enable the pad to deform appropriately under clamping force, distributing pressure uniformly while maintaining effective contact.
2Productivity
If uniform pressure is applied during pressurization, then charge/discharge efficiency is improved, but device complexity increases
Solution Approach 1:
The pressurization pad utilizes a foam material that acts as a flexible element, allowing it to conform to the battery cell surface and distribute pressure uniformly. This flexible approach achieves uniform pressure distribution without requiring complex mechanical systems, maintaining simplicity while improving charge/discharge efficiency.
Solution Approach 2:
The invention employs a composite structure consisting of a foam material with specific density characteristics combined with a controlled thickness ratio relative to the battery cell. This composite approach enables uniform pressure distribution and improved efficiency without adding significant structural complexity.
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 solution ensures uniform pressure application, enhancing initial charge/discharge efficiency and improving charge/discharge cycle performance of all-solid-state batteries.
Implementation Method 1
pressurizing the battery cell with a jig and applying a current
Implementation Method 2
clamping pressure applied to the battery cell
Data Source
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AI summary
The present invention relates to a battery cell pressurization pad and a battery cell pressurization device comprising same, and more particularly to a battery cell pressurization pad for improving the performance of an all-solid-state battery cell.