Rechargeable Battery Protection Layer for Inversion Plate Safety
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Solution Overview
Problem
Rechargeable batteries face safety risks due to excessive heat generation and electrolyte decomposition, which can lead to increased internal pressure and potential ignition or explosion, necessitating improved safety configurations.
Innovation Solution
Incorporating a protection layer with a higher melting point than the cap plate under the inversion plate in the rechargeable battery design, which prevents malfunction by maintaining operation during short-circuits and ensuring continuous function, thereby enhancing safety by closing holes and interrupting current flow before dangerous situations arise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cap plate with a short-circuit hole is used in the cap assembly, then the inversion plate can operate to prevent short-circuit, but the inversion plate may malfunction when excessive heat is generated or electrolyte is decomposed
Solution Approach 1:
A protection layer is introduced as an intermediary component between the inversion plate and the harmful environment (heat and electrolyte). This protection layer has a higher melting point than the cap plate and serves as a barrier that shields the inversion plate from direct exposure to excessive heat and decomposed electrolyte, thereby preventing inversion plate malfunction while maintaining its short-circuit prevention function
Solution Approach 2:
The protection layer is installed in advance on the inversion plate to provide preemptive protection against heat and electrolyte damage. By having this protective barrier in place before any short-circuit or thermal runaway event occurs, the inversion plate is pre-shielded from conditions that would cause it to malfunction, ensuring it can operate reliably when needed
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
The implementation of a protection layer with a higher melting point ensures the rechargeable battery's safety by preventing inversion plate malfunction and maintaining operation during short-circuits, thereby preventing ignition or explosion.
Implementation Method 1
a protection layer having a higher melting point than the cap plate is formed under the inversion plate
Data Source
AI summary
A rechargeable battery is provided, which includes a protection layer with an inversion plate, thereby improving safety by preventing the inversion plate from malfunctioning. In one example embodiment, the rechargeable battery includes an electrode assembly including a first electrode plate, a second electrode plate, and a separator disposed between the first electrode plate and the second electrode plate, a case accommodating the electrode assembly, and a cap assembly coupled to the case, wherein the cap assembly comprises a cap plate sealing the case and having a short-circuit opening, an inversion plate installed in the short-circuit opening of the cap plate, and a connection plate installed to cover the short-circuit opening of the cap plate, and a protection layer having a higher melting point than the cap plate is formed under the inversion plate.