Battery Bottom Venting Layout for Thermal Runaway Gas Release
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Solution Overview
Problem
The safety of power batteries in electric vehicles is compromised due to thermal runaway, which can lead to high-temperature gas release causing potential hazards, as existing pressure release mechanisms on the box cover can directly impact vehicle components or passengers.
Innovation Solution
A battery design with a pressure release mechanism installed on the bottom wall of the box body, aligned to avoid overlap with battery cells, allowing safe discharge of high-temperature smoke and incorporating gas discharging elements with channels to guide exhaust away from the box cover, reducing the risk of damage and improving safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pressure release mechanism is installed on the box cover to release high-temperature gas during thermal runaway, then the pressure release function is achieved, but the high-temperature gas directly impacts vehicle components or passengers causing safety hazards
Solution Approach 1:
The patent inverts the conventional location of the pressure release mechanism from the box cover (top) to the bottom wall (bottom) of the battery box. This inversion changes the discharge direction of high-temperature gas from upward toward passengers to downward away from passengers, fundamentally resolving the safety hazard while maintaining the pressure release function
Solution Approach 2:
The patent introduces a directional dimension to the pressure release mechanism by configuring it to discharge gas in a specific direction (downward through the bottom wall) rather than omnidirectionally or upward. This dimensional control ensures gas is discharged away from vulnerable areas, addressing the safety concern
2Device complexity
If the pressure release mechanism is positioned directly above battery cells for compact design, then device compactness is improved, but the mechanism may be blocked by battery cells preventing stable pressure release
Solution Approach 1:
The patent employs asymmetric spatial arrangement by positioning the pressure release mechanism laterally offset from the battery cell columns rather than symmetrically above them. This asymmetric positioning eliminates the blocking issue while maintaining compact overall design, as the mechanism discharges through the bottom wall away from cell projections
Solution Approach 2:
The patent resolves the blocking conflict by changing the discharge dimension from vertical (through the box cover) to horizontal/lateral (through the bottom wall at an offset position). This dimensional shift allows the mechanism to operate reliably without being blocked by battery cells while maintaining compact footprint
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 solution effectively reduces the risk of safety hazards by ensuring that high-temperature smoke is discharged from the bottom of the battery, preventing direct impact on vehicle components or passengers and ensuring stable operation of the pressure release mechanism, thereby enhancing the safety and longevity of the battery.
Implementation Method 1
the thermal runaway of the battery cells is one of the important factors that threaten the safety performance of the battery
Implementation Method 2
the at least one pressure release mechanism is configured to be activated when the pressure or temperature in the accommodation space reaches a threshold value, to release the pressure in the accommodation space
Data Source
AI summary
A battery, an electric device, and a manufacturing method and manufacturing device for the battery are provided. The battery includes at least one battery cell, a box body having a bottom wall, at least one box cover and at least one pressure release mechanism. The at least one box cover and the box body, arranged in a first direction, define together an accommodation space for accommodating the battery cells. The at least one box cover and the bottom wall are arranged opposite to each other in the first direction. The at least one pressure release mechanism is installed on the bottom wall, and configured to be activated when the pressure or temperature in the accommodation space reaches a threshold value, to release the pressure in the accommodation space. Projections of the pressure release mechanism and the battery cell do not overlap in a plane perpendicular to the first direction.