Battery Box Venting Structure With Supported Bottom Guard Plate
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Solution Overview
Problem
The existing thermal runaway design in lithium battery modules, which includes a pressure relief channel formed by spacing apart a tray and a bottom guard plate, results in poor connection strength and anti-impact strength due to the middle portion of the bottom guard plate being suspended, leading to potential safety and maintenance issues.
Innovation Solution
A battery box design featuring a detachable bottom guard plate connected via suction discs to a bracket, forming a pressure relief channel, which enhances connection strength and anti-impact strength, and allows the bottom guard plate to bulge outward under thermal runaway gas pressure to increase channel volume, improving safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pressure relief channel is formed by spacing apart the tray and bottom guard plate, then the thermal runaway gas can be discharged, but the connection strength and anti-impact strength of the bottom guard plate deteriorates due to the middle portion being suspended
Solution Approach 1:
The bottom guard plate is divided into a first bottom guard plate and a second bottom guard plate, with the first portion forming the pressure relief channel and the second portion providing structural support. This segmentation allows the plate to simultaneously achieve gas discharge functionality and mechanical strength, as the supported portion maintains structural integrity while the spaced portion enables thermal runaway gas venting.
2Ease of manufacture
If the bottom guard plate is detachably connected to improve production convenience, then the maintenance cost is reduced, but the connection strength may deteriorate
Solution Approach 1:
The bottom guard plate is segmented into multiple portions that can be detachably connected to the battery box body. This allows the plate to be easily assembled and disassembled for production and maintenance purposes, while the segmented structure with supported and spaced portions maintains adequate connection strength through the supported regions.
Solution Approach 2:
A support structure serves as an intermediary element between the bottom guard plate and the battery box body, providing detachable connection points. This intermediary structure enables easy assembly and disassembly while maintaining structural strength, as the support structure distributes loads and provides multiple connection points.
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 improves production convenience, reduces maintenance costs, enhances connection and anti-impact strength, and ensures safer discharge of thermal runaway gases, thereby increasing the overall safety and reliability of the battery box.
Implementation Method 1
one side of the bracket facing the bottom guard plate is provided with the suction disc, and the suction disc is configured to abut against the bottom guard plate
Implementation Method 2
when the thermal runaway gas of the cell assembly enters the pressure relief channel, an increase in air pressure within the pressure relief channel enables the suction disc to be separated from the connection to the bottom guard plate, and the bottom guard plate bulges outwards in the direction facing away from the bracket under the push of the air pressure of the thermal runaway gas to increase the volume of the pressure relief channel
Data Source
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AI summary
Provided are a battery box and a battery pack. The battery box includes a box body (1), a bottom guard plate (2), a bracket (3), and a suction disc (4). The box body (1) is provided with an accommodation cavity (11). One side of the box body (1) along the first direction is provided with an opening communicating with the accommodation cavity (11). The bottom guard plate (2) is detachably connected to the opening. The bracket (3) is mounted on the cavity wall of the accommodation cavity. The bracket (3) and the bottom guard plate (2) are spaced apart to form a pressure relief channel. The pressure relief channel is configured to relieve a thermal runaway gas of a cell assembly on the bracket (3). One side of the bracket (3) facing the bottom guard plate (2) is provided with the suction disc (4). The suction disc (4) abuts against the bottom guard plate (2).