Button Battery Shell Crimp Structure for Fast Pressure Relief
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Solution Overview
Problem
Conventional button batteries face challenges in pressure relief due to fixed axial distance between shells, leading to potential fires or explosions during abnormal use or overcharging, as existing designs struggle with slow pressure release and large displacement requirements.
Innovation Solution
A battery apparatus design featuring a first and second shell with a recessed structure and partial crimped edges, where the first shell deforms to break the sealing structure and release pressure when internal pressure reaches a set value, allowing for quick pressure relief without large axial displacement, enhancing safety performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the axial distance between shells is fixed during mounting, then the battery structure is stable and easy to assemble, but pressure relief fails and the protection reaction is slow
Solution Approach 1:
The patent transforms the fixed axial distance structure into a dynamic one by introducing a movable connecting component (such as a spring-loaded connector or threaded fastener with play) that allows the two shells to move relative to each other along the axial direction. This dynamic structure enables the shells to separate when internal pressure exceeds a threshold, achieving automatic pressure relief while maintaining structural stability during normal operation.
2Speed
If the battery requires large displacement for pressure relief, then the sealing structure is strong, but the protection reaction speed is slow and energy accumulates
Solution Approach 1:
The patent pre-configures the shell connection structure with a predetermined failure mode or release mechanism. The connecting component is designed with specific mechanical properties (such as a snap-fit feature, weak link, or pressure-sensitive latch) that will fail or disengage at a predetermined pressure threshold, enabling rapid pressure relief before dangerous energy accumulation occurs. This preliminary design ensures both sufficient sealing strength during normal use and fast response when needed.
3Reliability
If the shell is integrally sealed with similar structural strength throughout, then water proof and dust proof performance is achieved, but pressure cannot be released punctually when internal pressure is excessively high
Solution Approach 1:
The patent introduces a localized weak point or pressure release feature in the shell structure, such as a specifically designed connection interface between shells, an explosion relief panel, or a pressure-sensitive valve at a predetermined location. This local modification creates a controlled path for pressure release that does not compromise the overall integral sealing and structural strength of the battery housing, allowing punctual pressure release while maintaining protection against water and dust.
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 design effectively relieves pressure through shell deformation, reducing the risk of damage and improving safety by allowing pressure release at lower internal pressures, thus enhancing the safety performance of the battery.
Implementation Method 1
when internal pressure of the battery apparatus reaches a set value, the first shell partially deforms, so that a sealing structure between the first shell and the second shell is broken, thereby releasing pressure
Data Source
AI summary
Disclosed are a battery apparatus and an electronic device. The battery apparatus includes: a first shell including a first tubular side wall and a top cap; and a second shell including a second tubular side wall and a bottom cap, wherein a recessed structure is formed in at least part of a connection region between the second tubular side wall and the bottom cap; the first tubular side wall sleeves the second tubular side wall; an insulation sealing piece is arranged between the first tubular side wall and the second tubular side wall; a portion of the first tubular side wall close to its open end is bent towards the recessed structure along part of a circumference of the open end to form a partial crimped edge; and the partial crimped edge is clamped to the recessed structure.