Battery Pack Vent Passage Structure for Particle Capture
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Solution Overview
Problem
Existing battery packs face challenges in efficiently capturing solid objects, such as particulate matter, that move within the casing due to the discharge of gas from battery cells, which can lead to distortion and reduced efficiency, and require large components like exhaust ducts, limiting the arrangement and size of the pack.
Innovation Solution
The battery pack incorporates a first wall portion extending from the casing's surface where the outlet is located, shaped to direct away from the surface and toward the upstream side of the gas passageway, allowing for efficient capture of solid objects, with additional wall portions and a baffle plate guiding and capturing these objects, reducing the need for large components and enhancing rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large exhaust duct is provided to capture solid objects, then the capture efficiency of solid objects is improved, but the device complexity and size of the battery pack increase
Solution Approach 1:
The exhaust duct is divided into multiple wall portions (first wall portion, second wall portion, third wall portion) that extend in different directions. Each wall portion captures solid objects in different flow directions, achieving comprehensive capture without requiring a single large complex duct structure.
Solution Approach 2:
The wall portions extend in multiple spatial dimensions (different directions from the first surface), creating a three-dimensional capture network. This allows efficient solid object capture using distributed simple structures rather than a single large component.
2Volume of stationary object
If the interval between the battery module and the first surface of the casing is made small to reduce pack size, then the volume of the battery pack is reduced, but the rigidity of the wall portion decreases leading to distortion
Solution Approach 1:
The exhaust duct is segmented into multiple wall portions fixed at different locations and extending in different directions. This segmentation allows each wall portion to be optimized for its local structural requirements, maintaining rigidity even when the overall interval is small.
Solution Approach 2:
The wall portions extend in multiple spatial dimensions, distributing structural support across different directions. This multi-dimensional arrangement provides enhanced rigidity and resistance to distortion without requiring increased interval space.
Data Source
AI summary
A battery pack, including a battery module, a casing that houses the battery module, and a first wall portion. The casing has: a wall of which an inner surface is a first surface, the battery module being arranged with an interval from the first surface so as to form a first gas passageway between the battery module and the first surface; and an outlet formed in the wall, gas inside the casing being dischargeable, sequentially through the first gas passageway and the outlet, to an outside of the casing. The first wall portion extends from the first surface of the casing, and is shaped so as to extend away from the first surface while extending toward an upstream side of the first gas passageway.