Battery Case Venting Structure Using Rib-Formed Gas Passages
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Solution Overview
Problem
Conventional battery packs have complex structures and high manufacturing costs due to the need for ducts to efficiently cool gases released during abnormal heat generation, which complicates the design and increases production expenses.
Innovation Solution
A battery case design featuring an inner case with a gas discharge part and an outer case with a gas discharge part, along with positioning ribs that form gas guide passages to direct gases from the inner discharge part to the outer discharge part, allowing for efficient cooling without the need for complex piping, thus simplifying the structure and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a duct is used to cool gas released from the battery, then the safety is improved, but the structure becomes complicated and manufacturing cost increases
Solution Approach 1:
The patent merges the gas discharge function and structural positioning function into a single integrated design. The inner case positioning parts serve dual purposes: they position the inner case relative to the outer case and simultaneously form gas guide passages that direct cooled gas from the inner discharge part to the outer discharge part. This eliminates the need for separate duct components while maintaining effective gas cooling and safety functionality.
2Reliability
If a duct is used to cool gas released from the battery, then the safety is improved, but the manufacturing cost increases
Solution Approach 1:
The patent combines multiple functions into the case structures themselves. The inner case includes both the battery accommodating chamber and the inner gas discharge part, while the outer case includes the outer gas discharge part. The positioning parts that are necessary for assembly also create the gas guide passages, eliminating the need for separate duct components and reducing manufacturing complexity and cost.
3Stability of the object's composition
If positioning parts are added to position the inner case, then the structural stability is improved, but the device complexity increases
Solution Approach 1:
The positioning parts are designed to serve multiple functions simultaneously: they provide structural positioning and stability of the inner case within the outer case, and they also form the gas guide passages that direct the flow of cooled gas. This multi-functionality eliminates the need for separate duct components, reducing overall device complexity while maintaining structural stability.
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
This design enables efficient cooling of gases released during abnormal heat generation while maintaining a simple structure and reducing manufacturing costs, enhancing safety and assemblability of the battery pack.
Implementation Method 1
one or more gas guide passages defined by an outer surface of the inner case, an inner surface of the outer case, and the plurality of inner case positioning parts and configured to guide a gas from the inner gas discharge part to the outer gas discharge part side
Implementation Method 2
one or more inner relief parts which are damaged when the internal pressure of the battery accommodating chamber becomes equal to or higher than the first predetermined pressure
Data Source
AI summary
A battery case includes: an inner case that includes an inner gas discharge hole for discharging the gas generated in batteries accommodated in a battery accommodating chamber to the outside of the battery accommodating chamber; an outer case that has an inner case accommodating chamber accommodating the inner case and includes an outer gas discharge hole for discharging the gas to the outside; a plurality of ribs that extend from the outer surface of the inner case to the inner surface of the outer case, to position the inner case with respect to the outer case, and are arranged at intervals from each other; and one or more gas guide passages defined by an outer surface of the inner case, an inner surface of the outer case, and the plurality of ribs and configured to guide a gas from the inner gas discharge hole to the outer gas discharge hole.