Solid-State Battery Current Collector Support for Flat Stacking
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Solution Overview
Problem
The issue of current collecting units cracking or cutting during the manufacturing process of all-solid-state rechargeable batteries, particularly when stacking multiple cells, leads to reduced charging/discharging capacity and increased probability of short circuits due to surface unevenness and the need for additional processing steps.
Innovation Solution
Incorporating an insulating layer to support the current collecting units from at least one side, with conductive units penetrating the insulating layer to connect to external wiring, allowing for isostatic pressure without disturbing the insulating layer, thereby reducing the likelihood of cracks and cuts in the current collecting units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If isostatic press is applied to reduce surface unevenness, then surface flatness is improved, but current collecting units are cracked or cut due to mechanical stress
Solution Approach 1:
The patent applies isostatic press at a controlled pressure range (10-100 MPa, preferably 30-70 MPa) before final assembly to reduce surface unevenness of electrode layers while preventing crack formation in current collecting units. This prior cushioning approach allows surface flattening without exceeding the mechanical strength threshold of the current collecting units.
Solution Approach 2:
The patent optimizes the isostatic press pressure parameters within a specific range (10-100 MPa) to balance two competing requirements: sufficient pressure to reduce surface unevenness for good contact, but not excessive pressure that would cause cracking. The pressure parameter is precisely controlled to achieve the desired surface flatness while maintaining current collecting unit integrity.
2Reliability
If protective members are added to prevent cracking, then current collecting unit integrity is improved, but manufacturing process complexity increases due to additional steps
Solution Approach 1:
The patent enables the current collecting units to withstand isostatic press themselves by optimizing the pressure parameters and controlling the pressing process. The current collecting units are designed with sufficient mechanical strength to self-resist cracking under controlled isostatic press conditions, eliminating the need for external protective members or additional protective steps in the manufacturing process.
3Quantity of substance
If multiple batteries are stacked to increase capacity, then energy density is improved, but surface unevenness causes short circuits between adjacent cells
Solution Approach 1:
The patent applies isostatic press to each battery cell before stacking to pre-flatten the surface unevenness of electrode layers and current collecting units. This preliminary surface flattening action ensures that when multiple cells are stacked, the surfaces are sufficiently flat to prevent short circuits between adjacent cells, enabling safe high-capacity battery packs with multiple stacked units.
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 configuration enhances the manufacturing process by preventing cracks and cuts in the current collecting units, maintaining electrical connectivity, and reducing the risk of short circuits, thus ensuring stable charging/discharging capacity and cycle characteristics in both single and stacked all-solid-state rechargeable batteries.
Implementation Method 1
an insulating layer on a side end surface of the positive electrode layer to cover the positive electrode layer... configured to support the positive electrode current collecting unit and the negative electrode current collecting unit from at least one side
Implementation Method 2
a plurality of conductive units electrically connecting each of the positive electrode current collecting units and the negative electrode current collecting units to an external wiring, and the plurality of conductive units are formed to penetrate the insulating layer
Implementation Method 3
pressing the stack structure from a stack direction by isostatic press
Data Source
AI summary
An all-solid-state rechargeable battery and a stacked all-solid-state rechargeable battery capable of reducing surface unevenness are provided. The battery makes it more difficult to crack a current collecting unit and to cut the current collecting unit, and the battery may be easily manufactured. The all-solid-state rechargeable battery includes positive and negative electrode layers; solid electrolyte layers stacked between the positive and negative electrode layers; an insulating layer on a side end surface of the positive electrode layer that covers the positive electrode layer; and thin type positive and negative electrode current collecting units protruding laterally from the positive and negative electrode layers, respectively. The insulating layer supports the positive and negative electrode current collecting units from at least one side. Two conductive units electrically connecting each of the positive and negative electrode current collecting units to an external wiring are formed in the insulating layer.