Cell Assembly Vent Path With Reverse Flow Blocking for Battery Packs
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Solution Overview
Problem
Battery cells in electric vehicles are prone to explosions due to temperature increases or external shocks, leading to heat propagation and damage from flames and gases, posing safety risks.
Innovation Solution
A battery pack design incorporating a cell assembly unit with a frame unit, bracket unit, and reverse flow prevention member that forms a gas discharge path, using a reverse flow prevention member with gas permeation holes to prevent heat propagation and ensure safe discharge of gases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If battery cells are directly installed in the electric vehicle using CTP technology, then productivity and energy density are improved, but safety deteriorates due to heat propagation and explosion risks
Solution Approach 1:
The patent divides the battery pack into multiple compartments using partition walls, separating battery cells into isolated sections. This segmentation prevents flame and gas propagation between cells, addressing safety concerns while maintaining the direct installation approach of CTP technology for high productivity
Solution Approach 2:
The patent introduces a bus bar cover as an intermediary component that serves multiple functions: electrical connection, structural support, and safety protection. The cover includes discharge paths that guide gas away from other cells, acting as a mediator that enables direct installation while preventing heat propagation
2Reliability
If battery cells are mounted in modules, then safety is improved through structured arrangement, but device complexity and manufacturing cost increase
Solution Approach 1:
The bus bar cover is designed to perform multiple functions simultaneously: providing electrical connections between cells, offering structural support, enabling gas discharge, and preventing heat propagation. This multi-functionality reduces the need for separate safety components, simplifying the overall structure while maintaining safety
Solution Approach 2:
The patent merges the bus bar function with the cover structure, combining electrical connection and safety protection into a single integrated component. This merging reduces device complexity by eliminating separate safety components while maintaining structured arrangement benefits
3Temperature
If flame and gas are allowed to propagate freely, then heat dissipation is improved, but harmful effects increase due to damage to other battery cells
Solution Approach 1:
The patent converts the harmful gas generated by battery cell failure into a controlled discharge flow. The bus bar cover includes discharge paths that guide the gas away from other cells, transforming the harmful propagation into a controlled release that protects other cells while still allowing heat dissipation
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 effectively prevents heat propagation and ensures safe discharge of gases, enhancing safety by reducing the risk of further explosions and maintaining energy density.
Implementation Method 1
the reverse flow prevention member including a plurality of gas permeation holes, each of which extends from one end facing the bus bar and leads to another end facing the flow path
Implementation Method 2
the bracket unit and the frame unit form a flow path through which a gas is discharged
Data Source
Figure 1
Figure 2a
Figure 2b
AI summary
A battery pack includes a cell assembly unit including a plurality of battery cells and a bus bar configured to electrically connect the plurality of battery cells, a frame unit accommodating the cell assembly unit, a bracket unit fixing the cell assembly unit to the frame unit, wherein the bracket unit and the frame unit form a flow path through which a gas is discharged, and a reverse flow prevention member disposed between the bus bar and the bracket unit, the reverse flow prevention member including a plurality of gas permeation holes, each of which extends from one end facing the bus bar and leads to another end facing the flow path.