Battery End Cap Pressure Relief Mechanism Design
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Solution Overview
Problem
Existing battery technologies face challenges in ensuring effective pressure relief, which is crucial for safety performance, as traditional pressure relief mechanisms can suffer from stress fatigue and occupy valuable space within the battery, impacting energy density.
Innovation Solution
A pressure relief mechanism in the end cap assembly that operates in two distinct states, adjusting its relief area based on internal pressure or temperature thresholds, allowing for rapid pressure release when necessary without the need for a gas storage space, thus enhancing safety and maintaining energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional pressure relief mechanism is used, then pressure relief function is provided, but the mechanism occupies internal space of the battery cell, affecting energy density
Solution Approach 1:
The pressure relief mechanism is extracted from the internal space of the battery cell and relocated to the end cap assembly. The end cap assembly includes a pressure relief mechanism that can be activated when the battery cell is overpressurized, allowing pressure relief without occupying valuable internal space that would otherwise be available for energy-storing components.
2Reliability
If a pressure relief mechanism with fixed relief area is used, then pressure relief is provided, but stress fatigue occurs and relief effectiveness is limited
Solution Approach 1:
The pressure relief mechanism employs a movable blocking piece that can dynamically adjust the pressure relief area based on the internal pressure conditions. When pressure exceeds a threshold, the blocking piece moves to open pressure relief passages; when pressure is normal, the blocking piece remains in position to seal the passages. This dynamic adjustment prevents stress fatigue from constant pressure exposure while maintaining effective pressure relief capability.
3Productivity
If pressure relief area is increased, then pressure relief rate is improved, but more internal space is occupied
Solution Approach 1:
The pressure relief mechanism is segmented into multiple pressure relief passages that can be selectively opened based on pressure conditions. The blocking piece can move to open one or more passages depending on the severity of overpressurization. This segmentation allows the system to provide high pressure relief rate when needed while maintaining a compact structure that does not occupy excessive space during normal operation.
Data Source
AI summary
An end cap assembly, a battery cell, a battery, an electrical device, and a method and device for manufacturing a battery cell are provided. The end cap assembly includes an end cap and a pressure relief mechanism. The pressure relief mechanism is connected to the end cap. The pressure relief mechanism is configured to: keep in a first pressure relief state when an internal pressure or temperature of the battery cell is greater than or equal to a first threshold and less than a second threshold, so as to release the internal pressure of the battery cell; and keep in a second pressure relief state when the internal pressure or temperature of the battery cell is greater than or equal to the second threshold, so as to release the internal pressure of the battery cell.