All-Solid-State Battery Resin Modulus Matching for Extending Parts
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Solution Overview
Problem
The production of all-solid-state batteries faces challenges with cracking of extending parts and resin layers due to deformation and volume changes during charging and discharging, caused by the stress imparted by the resin layer when the cell laminate is restrained in the lamination direction.
Innovation Solution
The solution involves an all-solid-state battery design where the ratio of the compressive modulus of the resin layer to the cell laminate is 0.4 or less, which suppresses deformation and subsequent cracking by matching the compressive properties of the resin layer to the cell laminate, thereby reducing the risk of cracking during charging and discharging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the cell laminate is restrained in the lamination direction with a resin layer, then the structural stability is improved, but cracking of the extending parts and resin layer occurs due to stress from volume changes during charging and discharging
Solution Approach 1:
The patent changes the physical parameter of the resin layer by controlling its compressive modulus to be 0.4 or less relative to the cell laminate. This parameter adjustment allows the resin layer to provide structural stability while accommodating volume changes during charging and discharging, preventing cracking of both the extending parts and resin layer.
2Reliability
If the resin layer is supplied to embed in gaps between extending parts, then the sealing reliability is improved, but deformation of extending parts occurs due to stress imparted by the resin layer
Solution Approach 1:
The patent adjusts the compressive modulus parameter of the resin layer to be 0.4 or less relative to the cell laminate. This enables the resin to effectively seal the gaps between extending parts while its reduced stiffness prevents excessive stress that would cause deformation of the extending parts during battery operation.
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 effectively suppresses cracking of the extending parts and resin layers, ensuring the structural integrity and longevity of the battery by controlling the compressive modulus ratio, thus enhancing the battery's performance and reliability.
Implementation Method 1
the ratio of the compressive modulus of the resin layer to the compressive modulus of the cell laminate is 0.4 or less, which suppresses deformation and subsequent cracking by matching the compressive properties of the resin layer to the cell laminate
Data Source
AI summary
An all-solid-state battery including a cell laminate including two or more unit cells, and a resin layer covering a side surface of the cell laminate, wherein each unit cell includes a positive electrode current collector layer, a positive electrode active material layer, a solid electrolyte layer, a negative electrode active material layer, and a negative electrode current collector layer laminated in this order, at least one of the positive electrode current collector layer, positive electrode active material layer, solid electrolyte layer, negative electrode active material layer, and negative electrode current collector layer includes extending parts which extend more outwardly from the side surface of the cell laminate than the other layers, and gaps are formed between the extending parts, and the ratio of the compressive modulus of the resin layer to the compressive modulus of the cell laminate is 0.4 or less.