Battery Pack Tray Structure for Impact Protection and Pressure Relief
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Solution Overview
Problem
The existing battery pack design has poor impact protection and safety issues due to inadequate protection of the battery module's bottom and rapid pressure relief, which can lead to open fires during thermal runaway.
Innovation Solution
The battery pack design includes a case body with an accommodation trough and pressure relief members, where each tray is supported by spaced-apart supports that form a pressure relief cavity, and the adhesive is bonded through holes to enhance rigidity and slow down the discharge of high-temperature substances, preventing open fires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the tray is tightly secured to the case body with a fastening screw, then the tray is firmly fixed, but the impact protection effect of the bottom of the battery module is poor
Solution Approach 1:
The patent introduces a cushioning layer between the tray and the case body bottom plate. This cushioning layer is specifically designed to absorb impact energy and protect the battery module bottom from direct impact. The cushioning structure is pre-installed in the accommodation trough, providing beforehand protection against potential impacts while maintaining the tray's fixed position through the fastening screw.
2Speed
If the pressure relief cavity is designed for direct discharge, then the pressure relief is fast, but the oxygen inside the pressure relief cavity is not exhausted and an open fire occurs
Solution Approach 1:
The patent segments the pressure relief cavity into multiple regions using baffle plates. These baffle plates divide the cavity into several compartments, forcing the high-temperature gas to flow through a longer, more complex path. This segmentation increases the residence time of the gas in the cavity, allowing oxygen to be consumed or diluted before discharge, thereby reducing the risk of open fire while maintaining effective pressure relief.
Solution Approach 2:
The cushioning layer serves as an intermediary substance between the battery module and the case body bottom plate. During pressure relief, this cushioning material interacts with the high-temperature gas, providing additional cooling and extending the gas's residence time in the pressure relief cavity. This intermediary effect helps exhaust oxygen and reduce the temperature of discharged gas, preventing open fire.
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 impact resistance and safety by enhancing the rigidity of the bottom portion and prolonging the time for high-temperature substances to cool down within the pressure relief cavity, reducing the risk of open fires.
Implementation Method 1
each of the battery modules is bonded to an upper side of the tray body of the tray corresponding to the battery module by an adhesive, and the adhesive is bonded to the bottom portion of the accommodation trough through the first through hole
Data Source
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AI summary
A battery pack includes: a case body including an accommodation trough and a pressure relief member; battery modules; and trays each corresponding to corresponding one of the battery modules and including a tray body and supports; where each of the battery modules is bonded to an upper side of the tray body by an adhesive, a first end of each of the supports is connected to the tray body, a second end of the support is in contact with a bottom portion of the accommodation trough, the tray body and the bottom portion of the accommodation trough are spaced apart to form a pressure relief cavity communicating with the pressure relief member, each of the supports is provided with a first through hole, and the adhesive is bonded to the bottom portion of the accommodation trough through the first through hole from the upper side.