Battery Pack Venting Filter for Thermal Safety and Maintenance
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Solution Overview
Problem
Conventional battery packs face challenges in effectively supplying cooling water and smoothly discharging gas during internal gas generation, while also requiring enhanced maintenance and management capabilities, especially during thermal events.
Innovation Solution
A battery pack design featuring a pack case with a mesh structure for gas discharge, a detachable filter for venting gas, and an electrical connection unit that allows for maintenance through an opened venting hole, incorporating a filter frame with different mesh structures and materials for effective gas filtration and thermal safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional battery pack structure is used, then the battery pack can be assembled, but it cannot effectively supply cooling water or smoothly discharge gas during thermal events
Solution Approach 1:
The pack case is designed to perform multiple functions: it serves as both the structural housing and the cooling water supply system, and simultaneously functions as the gas discharge system through integrated venting holes. This eliminates the need for separate cooling and venting components, resolving the contradiction between thermal safety and system complexity.
Solution Approach 2:
The pack case incorporates venting holes with mesh structures that allow gas to pass through while maintaining structural integrity. The mesh structure acts as a porous barrier that filters and directs gas discharge, enabling effective thermal event management without adding complex separate venting mechanisms.
2Reliability
If the pack case is sealed for safety, then thermal runaway propagation is prevented, but maintenance and management become difficult
Solution Approach 1:
The pack case is segmented with removable filters positioned at the venting holes. These filters can be independently removed to provide access to the interior space, allowing maintenance personnel to inspect and service battery modules without compromising the overall sealed structure that prevents thermal runaway propagation.
Solution Approach 2:
The venting holes are pre-configured with removable filters that maintain the sealed structure during normal operation. When maintenance is needed, the filters are preliminarily designed to be easily removable, providing access pathways that were planned in advance, thus enabling maintenance without breaking the thermal containment structure.
3Reliability
If a filter is installed in the venting hole to filter gas, then thermal safety is improved, but maintenance complexity increases
Solution Approach 1:
The filter is designed with dynamic characteristics - it can be in a installed state during normal operation to provide gas filtration, and can be easily removed when maintenance is required. The filter's mounting structure allows it to transition between fixed and removable states, adapting to different operational requirements without permanently increasing system complexity.
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 solution enables effective cooling water supply, smooth gas discharge, enhanced thermal safety, and simplified maintenance, preventing thermal runaway propagation and allowing for various voltage and capacity configurations.
Implementation Method 1
a pack case covering the at least one battery module and including a mesh structure for guiding gas discharge
Implementation Method 2
the filter is mounted on the venting hole to filter venting gas when a thermal event occurs
Data Source
AI summary
A battery pack includes a cell module assembly including a battery cell stack in which a plurality of battery cells are stacked; a pack case configured so as to house the cell module assembly and including a venting hole on at least one surface; and a filter disposed in the venting hole and configured to be detachable. The filter is mounted on the venting hole to filter venting gas when a thermal event occurs in the battery cell, and can be removed from the venting hole so as to promote maintenance and repair of the inside of the battery pack in normal times.