Solid-State Battery Capacity Recovery via Gasifying Agent Pressure
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Solution Overview
Problem
Solid-state batteries experience capacity reduction due to electrode cracking, which is not effectively addressed by existing methods that require disassembly and large equipment, making in-vehicle capacity recovery impractical.
Innovation Solution
A method involving a resin-coated stack housed in a metal housing with a gasifying agent between them, where the battery is discharged to 0% SOC and subjected to a specified temperature, utilizing gas evaporation pressure to repair conductive paths and suppress capacity reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If isotropic pressurizing method is applied to recover battery capacity, then capacity recovery is achieved, but device complexity and manufacturing cost increase due to requirement of large pressurizing equipment and disassembly
Solution Approach 1:
The patent replaces the mechanical pressurizing system with a chemical system. Instead of using external pressurizing equipment to apply mechanical force to the battery, the invention uses a desiccant that chemically absorbs moisture generated during battery operation. This chemical approach eliminates the need for complex mechanical pressurizing equipment while achieving the same goal of preventing electrode cracking and maintaining battery capacity.
Solution Approach 2:
The patent introduces a desiccant as an intermediary substance between the battery components and the external environment. The desiccant acts as a mediator that absorbs moisture before it can reach and damage the electrode, thereby preventing capacity degradation without requiring direct mechanical intervention or complex equipment.
2Reliability
If battery is disassembled for capacity recovery, then electrode cracking can be addressed, but productivity and ease of operation decrease
Solution Approach 1:
The patent applies preliminary action by placing the desiccant in advance within the battery structure, specifically in the outer peripheral region where moisture tends to accumulate. This preventive measure is installed before any damage occurs, allowing the battery to maintain its capacity throughout operation without requiring subsequent disassembly or intervention. The desiccant is pre-positioned to proactively absorb moisture and prevent electrode cracking before it happens.
3Ease of manufacture
If moisture is allowed to accumulate in battery, then manufacturing is simpler, but electrode cracking occurs and capacity reduces
Solution Approach 1:
The patent introduces a desiccant as an intermediary substance that absorbs moisture generated during battery operation. The desiccant is placed in the outer peripheral region of the battery, acting as a barrier between moisture and the electrode. This approach maintains manufacturing simplicity while effectively preventing moisture-related electrode cracking and capacity degradation.
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 method effectively recovers battery capacity by restoring conductive paths, reducing electrode cracking, and maintaining high charge-discharge efficiency.
Implementation Method 1
utilizing gas evaporation pressure to repair conductive paths
Data Source
AI summary
To provide a method for producing a solid-state battery configured to suppress capacity reduction due to electrode cracking. A method for producing a solid-state battery comprising: a stack of a cathode, a solid electrolyte layer and an anode in this order, a resin layer coating at least a part of the stack, a metal housing housing the stack and the resin layer, and a gasifying agent disposed between the stack and the metal housing, wherein the solid-state battery production method comprises discharging the solid-state battery to a SOC of 0% and applying a specified temperature to the discharged solid-state battery.