Battery Pack Venting Structure With Adhesive Gap Bonding
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Solution Overview
Problem
The existing battery packs suffer from low connection strength and poor load-bearing capacity due to gaps between the battery cells and the casing, which compromises the overall strength and safety of the battery pack.
Innovation Solution
A battery pack design that includes a barrier assembly and a filling layer made of adhesive colloid to fill the gaps between the battery cell and the casing, forming an exhaust channel for the explosion-proof valve while enhancing the connection stability and load-bearing capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gaps are maintained between battery cells and casing for explosion-proof valve exhaustion, then safety is ensured, but connection strength and load-bearing capacity deteriorate
Solution Approach 1:
The gap region is segmented into two functional zones: an exhaust channel region for safety ventilation and a filling region for structural bonding. The barrier assembly divides the gap, allowing the filling material to be confined to specific areas that do not interfere with explosion-proof valve operation while providing strong mechanical connection in other areas.
Solution Approach 2:
Different regions of the gap are treated differently: the exhaust channel region maintains openness for safety ventilation, while the filling region is bonded with adhesive colloid for structural strength. This local differentiation allows simultaneous achievement of safety and connection strength requirements.
2Reliability
If gaps are maintained between battery cells and casing for explosion-proof valve exhaustion, then safety is ensured, but load-bearing capacity deteriorates
Solution Approach 1:
The gap is segmented to distinguish between the exhaust channel pathway and the filling region. This segmentation allows the filling material to provide load-bearing support in designated areas while leaving the exhaust channel open for safety ventilation.
Solution Approach 2:
The barrier assembly acts as an intermediary structure that guides the exhaust channel while also serving as a boundary for the filling material. This intermediary element enables the coexistence of open exhaust pathways and bonded filling regions.
3Strength
If filling material is used to bond battery cells to casing, then connection strength improves, but exhaust channel may be blocked
Solution Approach 1:
The gap is divided into distinct exhaust channel and filling regions using the barrier assembly. This spatial segmentation ensures that filling material is confined to areas that do not interfere with the exhaust channel, preventing blockage while maintaining bonding strength.
Solution Approach 2:
The exhaust channel function is extracted and separated from the filling region. By taking out the exhaust pathway as a distinct functional zone and protecting it with the barrier assembly, the filling material can be applied without risking blockage of the exhaust function.
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 improves the installation stability and load-bearing capacity of the battery pack by increasing the connection area and force transfer paths, ensuring stable bonding and dispersion of external forces, thereby enhancing the overall mechanical performance.
Implementation Method 1
the filling layer is made of an adhesive colloid, so that the at least part of the outer surface of the battery cell can be bonded with the at least part of the inner surface of the battery pack casing through the filling layer
Data Source
AI summary
A battery pack includes a battery pack casing, a battery cell, a barrier assembly and a filling layer, the battery cell is located in the battery pack casing and has a pole end face and an explosion-proof valve on the pole end face; the barrier assembly is installed on the battery cell and is between the pole end face and an inner surface of the battery pack casing, the inner surface of the battery pack casing, the pole end face and the barrier assembly jointly define an exhaust channel, and the explosion-proof valve is in the exhaust channel; and the filling layer is located outside the exhaust channel and is used for filling a gap between at least part of an outer surface of the battery cell and at least part of the inner surface of the battery pack casing, the filling layer is made of an adhesive colloid.