Battery Cell Housing Recess for Unobstructed Pressure Relief
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Solution Overview
Problem
Existing battery cells face challenges in efficiently relieving pressure and reducing safety risks due to obstruction of high-temperature and high-pressure substances from one cell obstructing the pressure relief mechanism of adjacent cells, leading to reduced reliability and increased safety hazards.
Innovation Solution
The battery cell design incorporates a recess on the housing to avoid overlapping with the pressure relief mechanism of adjacent cells, allowing timely release of high-temperature and high-pressure substances, with specific dimensions and orientations to optimize pressure relief and reduce obstruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If battery cells are arranged closely along the first direction to improve space utilization, then the energy density increases, but the pressure relief mechanism of adjacent cells obstructs each other, reducing reliability
Solution Approach 1:
The patent introduces a recess on the housing surface that extends in the second direction (perpendicular to the first direction), creating a three-dimensional relief structure. This dimensional change allows the pressure relief mechanism to discharge substances laterally through the recess rather than directly forward, avoiding obstruction from adjacent cells while maintaining close spacing for high energy density.
Solution Approach 2:
The discharge path is segmented into two directions: the primary discharge through the pressure relief mechanism in the first direction, and the secondary lateral discharge through the recess in the second direction. This segmentation allows the high-temperature and high-pressure substances to be diverted around obstacles, ensuring reliable pressure relief even when cells are closely arranged.
2Reliability
If the pressure relief mechanism is positioned to face away from adjacent cells to avoid obstruction, then reliability improves, but the housing surface area is reduced, affecting energy density
Solution Approach 1:
The recess is formed as a depression within the housing surface, effectively nesting a relief structure into the existing housing geometry. This allows the pressure relief mechanism to have an extended discharge path without increasing the overall external dimensions of the battery cell, thereby maintaining housing surface area and energy density while improving pressure relief reliability.
3Reliability
If the recess is made deeper to better avoid obstruction from adjacent cells, then pressure relief reliability improves, but the housing structural strength is reduced, increasing damage risk
Solution Approach 1:
The patent specifies optimized parameters for the recess including its depth, width, and positioning relative to the pressure relief mechanism. By carefully controlling these geometric parameters, the recess provides sufficient relief from adjacent cell obstruction while maintaining adequate housing structural strength. The recess depth is optimized to balance pressure relief effectiveness with structural integrity.
Data Source
AI summary
This application provides a battery cell, a battery, and an electric apparatus. The battery cell includes a housing and a pressure relief mechanism. The housing has a first wall and a second wall disposed opposite each other along a first direction. The housing is provided with a recess, where the recess is recessed relative to a surface of the second wall facing away from the first wall. The pressure relief mechanism is disposed on the first wall, where a projection of the pressure relief mechanism along the first direction at least partially overlaps a projection of the recess along the first direction.