Solid-State Lithium Battery Stack With Shared Collector Connections
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Solution Overview
Problem
Existing all-solid-state lithium batteries face reliability issues due to erosion of cathode and anode collector connectors, leading to increased electrical resistance and reduced lifetime, and require complex packaging of independent layered batteries.
Innovation Solution
The design involves stacking lithium battery units with shared cathode and anode collector layers, connected by dedicated connection parts, and an electrolyte layer that connects neighboring units, reducing exposure to air and simplifying packaging by integrating connectors within the battery structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If independent layered batteries are used with separate connectors, then electrical connection is established, but the connectors are exposed to air causing erosion and increased electrical resistance
Solution Approach 1:
The patent merges the connector function with the electrode collector layers by making the electrode collector layers of adjacent battery units serve dual purposes: as electrodes for their own battery unit and as connectors for neighboring units. This integration eliminates separate connectors that would be exposed to air, thereby preventing erosion and maintaining electrical conductivity.
Solution Approach 2:
The electrode collector layers act as intermediaries between adjacent battery units, providing both electrochemical function and electrical connection function. By using the electrode collector layers as mediators for inter-unit connection, the design avoids exposing dedicated connectors to air while maintaining reliable electrical contact.
2Reliability
If separate connectors are used for each battery unit, then electrical connection is achieved, but device complexity and packaging complexity increase
Solution Approach 1:
The patent combines multiple functions into the electrode collector layers: electrochemical function (as electrodes) and electrical connection function (as connectors). This merging eliminates the need for separate connectors and simplifies packaging, as adjacent battery units are directly connected through their shared electrode collector layers without requiring additional connection components or complex packaging arrangements.
Solution Approach 2:
The electrode collector layers are designed to perform multiple functions simultaneously: serving as active electrodes for their own battery unit and as connectors for adjacent battery units. This multi-functionality reduces the overall number of components needed and simplifies the battery pack structure, thereby reducing device complexity and packaging requirements.
3Use of energy by moving object
If multiple independent battery units are stacked, then energy capacity increases, but the number of connectors and packaging complexity increase
Solution Approach 1:
By making electrode collector layers serve dual purposes as both electrodes and connectors, the patent enables stacking of multiple battery units without proportionally increasing the number of connectors. Each electrode collector layer contributes to both the electrochemical capacity and the electrical connection network, thereby increasing energy capacity while minimizing connector quantity.
Solution Approach 2:
The electrode collector layers are designed with multi-functionality to serve as both active electrodes for energy storage and as connectors for electrical interconnection. This universal design allows multiple battery units to be stacked with minimal additional connectors, as each unit's electrode collector layers simultaneously provide both energy capacity and connection functions.
Data Source
AI summary
An all-solid-state lithium battery is disclosed, including a substrate; and a plurality of layers of lithium battery units stacked on the substrate. Each layer of lithium battery unit of the plurality of layers of lithium battery units includes at least two electrode collector layers, a first electrode layer, an electrolyte layer and a second electrode layer. Two neighboring layers of lithium battery units share one of the electrode collector layers. A method for fabricating an all-solid-state lithium battery is further disclosed.