Solid-State Battery Tab Fixing Structure to Prevent Cell Shifting
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Solution Overview
Problem
In all solid state batteries with bipolar electrodes, the difference in elasticity between anode and cathode active material layers can cause deformation and cracking during production, and the high pressure required for inorganic solid electrolytes leads to potential short circuits due to cell unit shifting during pressing.
Innovation Solution
The battery design includes cell units with facing current collectors and insulating portions, where tabs are fixed by a fixing member with holding and connecting portions to prevent shifting and deformation, and may include elastic, conductive, or plated components for enhanced stability and electrical connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high pressure is applied during production to densify layers in all solid state batteries, then the solid electrolyte layer is properly formed, but cell units shift position causing short circuits
Solution Approach 1:
The patent applies preliminary anti-action by designing a fixing member that prevents cell unit shifting before the high-pressure pressing process occurs. The fixing member with holding portions secures the cell units in place during the pressing operation, counteracting the potential harmful effect of position shift that would otherwise occur under pressure.
Solution Approach 2:
The fixing member acts as an intermediary element between the cell units and the pressing process. It mediates the interaction by providing mechanical constraint to the cell units during pressing, allowing the high-pressure densification to occur without causing the cell units to shift and short circuit.
2Quantity of substance
If bipolar electrodes are used with current collectors, then energy density is improved, but difference in elasticity between anode and cathode layers causes current collector deformation and active material layer cracking
Solution Approach 1:
The patent applies the counterweight principle by designing the fixing member to provide opposing mechanical support that counteracts the deformation forces generated by differential elasticity between anode and cathode layers. The fixing member compensates for the stress imbalance, preventing current collector deformation and subsequent cracking of active material layers.
3Reliability
If clips are used to fix current collector tabs, then electrical connection is established, but the fixing structure adds device complexity
Solution Approach 1:
The patent merges the fixing function and electrical connection function into a single integrated fixing member. The fixing member simultaneously provides mechanical constraint to prevent shifting and establishes electrical connection through its conductive structure, eliminating the need for separate clips and reducing overall device complexity.
Solution Approach 2:
The fixing member is designed with multi-functionality, serving both as a mechanical constraint device and an electrical conductor. This universal component performs multiple functions that would otherwise require separate elements, thereby simplifying the overall fixing structure while maintaining reliable electrical connection.
Data Source
AI summary
An all solid state battery in which shift in positions of a plurality of a cell unit arranged along a thickness direction can be prevented is provided. The all solid state battery includes a plurality of the cell unit connected in series. The all solid state battery includes a cell unit A and a cell unit B, a second current collector AY in the cell unit A and a second current collector BX in the cell unit B are arranged to face each other interposing a first insulating portion, and a tab AX, a tab AY, and a tab B are fixed by a fixing member.