All-solid-state electrode body lateral current collector connection
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Solution Overview
Problem
Existing all-solid-state electrochemical cells face challenges in securely connecting positive and negative electrode current collector layers to conductive portions of substrates without solvent residue, leading to potential battery characteristic deterioration and stress during charging and discharging.
Innovation Solution
The solution involves an all-solid-state electrode body design where positive and negative electrode connection layers are alternately stacked with escape portions allowing internal connections, enabling the current collector layers to be mounted on the same surface of the exterior packaging body, facilitating solvent removal and reducing stress through conductive adhesives and through-electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the positive electrode current collector layer and the negative electrode current collector layer are respectively connected to the conductive portions of different substrates via adhesive, then conductivity is secured, but the solvent of the adhesive cannot be completely removed causing battery characteristic deterioration
Solution Approach 1:
The patent changes the spatial arrangement from connecting current collector layers to substrates on opposite sides (stacking direction) to connecting them on the same side (lateral direction). This dimensional change allows the adhesive layers to be positioned where solvent can evaporate outward, enabling complete solvent removal while maintaining electrical conductivity through the conductive adhesive layers.
Solution Approach 2:
The patent performs solvent removal as a preliminary action before final battery assembly and sealing. By designing the connection structure to allow solvent evaporation to the external environment, the adhesive can be applied and then allowed to cure completely before the battery is sealed, preventing solvent entrapment that would deteriorate battery characteristics.
2Reliability
If the electrode body is mounted in substrates on both surfaces in the stacking direction, then conductivity is secured, but great stress acts on the electrode body during charging and discharging
Solution Approach 1:
The patent transitions from mounting current collector layers on opposite surfaces (stacking direction) to mounting them on the same surface (lateral direction). This dimensional reconfiguration allows both current collector layers to be connected to substrates on the same side, eliminating the stress concentration that would occur when the electrode body expands and contracts between substrates mounted on opposite sides.
Solution Approach 2:
The conductive adhesive layers serve as intermediary elements that provide both electrical connection and mechanical stress relief. By positioning these adhesive layers laterally rather than in the stacking direction, they can accommodate the expansion and contraction of the electrode body during charging and discharging without transmitting great stress to the electrode structure.
3Reliability
If conductive adhesive is used to connect current collector layers to substrates, then electrical connection is achieved, but solvent residue remains in the sealed cavity
Solution Approach 1:
The patent extracts the solvent removal process from the sealed battery cavity by designing the adhesive connection structure to allow solvent evaporation to the external environment. The adhesive layers are positioned such that solvent can escape laterally to the outside world before sealing, completely removing the harmful solvent residue that would otherwise remain trapped in the sealed cavity.
Solution Approach 2:
The patent performs solvent evaporation as a preliminary action before final sealing. The structure allows adhesive application followed by solvent evaporation to the external environment, ensuring complete solvent removal before the battery is sealed and put into service, thereby eliminating solvent residue that would deteriorate battery characteristics.
Data Source
AI summary
The present invention is an all-solid-state electrode body including: a positive electrode via that is formed in a negative electrode connection layer, and connects a plurality of a positive electrode connection layers adjacent to each other in a first direction; a negative electrode via that is formed in the positive electrode connection layer, and connects a plurality of the negative electrode connection layers adjacent to each other in the first direction; a positive electrode current collector layer which is exposed on a first surface that faces one side of the first direction in a stacked body, and is connected to the positive electrode connection layer via the positive electrode via; and a negative electrode current collector layer which is exposed on the first surface in the stacked body, and is connected to the negative electrode connection layer via the negative electrode via.