Battery Pack Support Structure for Clear Cell Vent Exhaust
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Solution Overview
Problem
Adhesive injected into the housing of a battery pack can block the cell explosion-proof valves during the curing process, hindering their smooth opening during thermal runaway, leading to potential large area rupture or ejection of the positive terminal, compromising safety performance.
Innovation Solution
A battery pack design featuring a support structure with an adhesive storage groove near the cell explosion-proof valves to divert adhesive away from blocking the valves, ensuring smooth gas discharge through exhaust vents and channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If adhesive is injected into the housing to secure cells, then the cells are firmly fixed and stability is improved, but the adhesive may block the cell explosion-proof valves and safety is worsened
Solution Approach 1:
The support structure is divided into distinct functional zones: a first support surface for cell placement, a second support surface forming adhesive storage grooves, and an exhaust channel. This segmentation allows adhesive to be confined to specific grooves away from the explosion-proof valves while still providing effective cell fixation, thus maintaining stability without compromising valve reliability
Solution Approach 2:
The adhesive storage grooves act as an intermediary structure between the adhesive and the explosion-proof valves. By providing dedicated storage spaces for adhesive on the second support surface, the design prevents direct contact between adhesive and valves, allowing both effective bonding and safe valve operation
2Strength
If adhesive is applied to secure cells to the support structure, then fixation strength is improved, but the adhesive may obstruct gas discharge and safety is worsened
Solution Approach 1:
The support structure separates fixation function (adhesive in grooves) from gas discharge function (exhaust channel). Adhesive is confined to storage grooves on the second support surface, while the exhaust channel provides an unobstructed pathway for gas discharge, eliminating the harmful effect of adhesive blocking gas flow
Solution Approach 2:
The harmful potential of adhesive is extracted by isolating it within storage grooves. The adhesive is removed from positions where it could block gas discharge paths, and only placed in designated areas where it provides fixation without interfering with the exhaust channel or explosion-proof valve operation
3Device complexity
If the battery pack structure is simplified without additional components, then manufacturing complexity is reduced, but adhesive management becomes problematic and safety is worsened
Solution Approach 1:
The support structure merges multiple functions into a single integrated component: cell support (first support surface), adhesive storage (second support surface with grooves), and exhaust channel integration. This merging provides effective adhesive management and protects explosion-proof valves without requiring separate additional components, thus improving reliability while maintaining manufacturing simplicity
Solution Approach 2:
The support structure serves multiple purposes: it supports cells during assembly, provides designated adhesive storage areas to prevent valve blocking, and integrates with the exhaust channel for gas discharge. This multi-functionality achieves reliable adhesive management and valve protection without increasing overall device complexity
Data Source
AI summary
A battery pack including multiple cells, a housing, and a support structure is provided. Each cell has a cell explosion-proof valve, and the surface where the cell explosion-proof valve of each cell is located is defined as a first cell end surface. The cells are all disposed in the housing. The support structure is at least partially disposed between an inner surface of the housing and the cells to define an exhaust channel between the support structure and the inner surface of the housing. The cells are disposed on the support structure, and the first cell end surface faces the support structure. The support structure is provided with an exhaust vent corresponding to the cell explosion-proof valves, and the exhaust vent is communicated with the exhaust channel. A sidewall of the support structure near the first cell end surface is provided with an adhesive storage groove.