All-solid-state battery overcharge suppression via internal short-circuit
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Solution Overview
Problem
Existing all-solid-state batteries face challenges in suppressing overcharge without a special structure outside the outer package, which can lead to damage and increased assembly time due to exposed discharging mechanisms.
Innovation Solution
An all-solid-state battery design with a laminated body, an outer package that can deform, and an overcharge suppression part enclosed within, featuring conductors that short-circuit the positive and negative electrode collectors upon expansion, allowing for self-discharge and preventing overcharge without external structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a discharging structure is arranged outside the outer package, then overcharge suppression function is achieved, but the structure is exposed and vulnerable to damage, and assembly time and labor increase
Solution Approach 1:
The patent merges the overcharge suppression function with the internal battery structure by integrating the discharging structure inside the outer package. The first and second conductors are arranged within the sealed outer package, combining the protective enclosure function with the overcharge suppression function, thereby eliminating the need for external discharging structures and reducing assembly complexity
Solution Approach 2:
The patent applies nesting by placing the discharging structure (conductors and short-circuiting mechanism) inside the outer package, which itself encloses the laminated body. This nested arrangement allows the overcharge suppression mechanism to be contained within the existing battery structure, protecting it from external damage while maintaining functionality
2Reliability
If a discharging structure is arranged outside the outer package, then overcharge suppression function is achieved, but the structure is exposed and vulnerable to damage
Solution Approach 1:
The patent combines the overcharge suppression mechanism with the internal battery structure, placing the conductors and short-circuiting components inside the sealed outer package. This integration provides structural protection to the discharging mechanism while maintaining its overcharge suppression function
Solution Approach 2:
The outer package serves as a protective enclosure that beforehand shields the internal discharging structure from external damage. By designing the structure to be enclosed from the beginning, the patent prevents potential damage to the conductors and short-circuiting mechanism before it can occur
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 design effectively suppresses overcharge by utilizing internal conductors that contact and disconnect based on the battery's expansion, ensuring continuous use without external short-circuit risks and simplifying assembly by eliminating the need for external discharging structures.
Implementation Method 1
the first conductor and the second conductor are conducted by a state change of the laminated body
Data Source
AI summary
An all-solid-state battery includes a laminated body in which a positive electrode layer, a solid electrolyte layer and a negative electrode layer are laminated, an outer package configured to enclose and seal in the laminated body, and an overcharge suppression part configured to be enclosed and sealed in the outer package together with the laminated body and be capable of short-circuiting a positive electrode collector of the positive electrode layer and a negative electrode collector of the negative electrode layer. The overcharge suppression part includes a first conductor extending from one of the positive electrode collector and the negative electrode collector, and a second conductor extending from another of the positive electrode collector and the negative electrode collector and separated from the first conductor. The first and second conductors are conducted by a state change of the laminated body.