Battery Box Venting Structure to Prevent Pressure Relief Blockage
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Solution Overview
Problem
In existing battery boxes, adhesive leaks into the pressure relief cavity, causing it to be blocked, leading to thermal runaway of multiple cells and increased risk of short circuits and thermal spread.
Innovation Solution
A battery box design with a support plate featuring heat insulating layers that seal through holes, allowing explosion-proof valves to communicate with a pressure relief cavity, preventing adhesive leakage and facilitating timely evacuation of high-temperature substances during thermal runaway.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If adhesive is used to secure single-cells in the battery box, then the single-cells are firmly fixed, but the adhesive leaks into the pressure relief cavity causing blockage
Solution Approach 1:
A heat insulating layer is introduced as an intermediary component between the single-cells and the pressure relief cavity. This layer serves dual functions: it prevents adhesive from migrating into the pressure relief cavity while maintaining thermal insulation properties, thus resolving the contradiction between securing cells firmly and preventing cavity blockage
Solution Approach 2:
The heat insulating layer is implemented as a thin film structure that covers the support plate surface. This thin film effectively blocks adhesive leakage paths while maintaining flexibility in the overall battery box structure, preventing cavity blockage without compromising cell fixation stability
2Reliability
If the pressure relief cavity is blocked by leaked adhesive, then the pressure relief function is lost, but this leads to thermal runaway of multiple single-cells
Solution Approach 1:
The heat insulating layer is installed in advance to prevent adhesive leakage before it can occur during battery operation. By establishing this protective barrier beforehand, the pressure relief cavity remains clear and functional, preventing the chain reaction of thermal runaway that would result from blockage
3Reliability
If heat insulating layer seals the through holes, then adhesive leakage is prevented, but thermal evacuation path must be maintained
Solution Approach 1:
The heat insulating layer is designed with local quality variations - it seals the through holes to prevent adhesive leakage while incorporating openings or regions that allow thermal evacuation. This localized differentiation of properties resolves the contradiction between preventing leakage and maintaining thermal escape paths
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
Prevents pressure relief cavity blockage, reduces the risk of thermal runaway and short circuits, and minimizes thermal spread by effectively managing thermal events in battery systems.
Implementation Method 1
a first surface of the support plate is provided with a first heat insulating layer, and the first heat insulating layer seals each of the first through holes
Implementation Method 2
Thermal runaway of the battery refers to that during the charging or discharging process of the battery, the internal chemical reaction of the battery is out of control, resulting in a rapid increase of the temperature which beyond the normal operating range, thereby generating a large amount of heat and gas
Data Source
Figure 1~2
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Figure 6~7
AI summary
A battery box and a battery system are provided. A support plate (200) and a side plate assembly (110) in the battery box are enclosed to form a first accommodating cavity (120). The support plate (200) is provided with a plurality of first through holes (210), and each of the first through holes (210) is disposed in one-to-one correspondence with an explosion-proof valve of each of the single-cells (400). A first surface of the support plate (200) is provided with a first heat insulating layer (220), and the first heat insulating layer (220) seals each of the first through holes (210). A bottom plate (300) and the support plate (200) are spaced apart, and the bottom plate (300), the support plate (200) and the side plate assembly (110) are enclosed to form a pressure relief cavity (310).