Battery Pack Venting Structure With Bonded Cell-to-Casing Support
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Solution Overview
Problem
The existing battery pack designs have gaps between the battery cell and the casing, leading to low connection strength and poor load-bearing capacity due to the exhaustion of the explosion-proof valve, which compromises the overall strength and safety of the battery pack.
Innovation Solution
A battery pack design that includes a barrier assembly between the pole end face of the battery cell and the inner surface of the casing to define an exhaust channel for the explosion-proof valve, with a filling layer made of adhesive colloid to bond the outer surface of the battery cell to the inner surface of the casing, enhancing connection stability and force transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gaps are left between the battery cell and the battery pack casing to allow the explosion-proof valve to exhaust, then the explosion-proof function is improved, but the connection strength and overall strength of the battery pack deteriorate
Solution Approach 1:
The battery pack structure is segmented into distinct functional zones: the exhaust channel (with gaps) for explosion-proof function, and the filling layer regions for bonding and strength. This spatial segmentation allows each zone to fulfill its specific function without compromising the other.
Solution Approach 2:
Different regions of the battery pack have different structural qualities: the exhaust channel region has gaps for explosion relief, while the filling layer regions have adhesive material for strong bonding. This local differentiation resolves the contradiction by providing appropriate properties in appropriate locations.
2Reliability
If gaps are left between the battery cell and the battery pack casing for explosion-proof valve exhaustion, then the safety of the battery cell is improved, but the load-bearing capacity of the battery pack deteriorates
Solution Approach 1:
The battery pack is divided into exhaust channels (for safety) and filling layer regions (for load-bearing). The barrier assembly further segments the exhaust channels to control gas flow while maintaining structural integrity in other areas.
Solution Approach 2:
The filling layer provides localized bonding and load-bearing capacity in regions where structural strength is needed, while leaving gaps in the exhaust channel regions for safety. This local quality differentiation resolves the contradiction between safety and load-bearing capacity.
3Reliability
If the barrier assembly is installed on the battery cell to define the exhaust channel, then the explosion-proof function is improved, but the device complexity increases
Solution Approach 1:
The barrier assembly uses thin plate structures (first barrier plate and second barrier plate) to define the exhaust channel. These thin film-like components achieve the explosion-proof function with minimal added complexity compared to bulky structural solutions.
Solution Approach 2:
The barrier assembly serves multiple functions: it defines the exhaust channel geometry, guides gas flow from the explosion-proof valve, and provides structural support. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device 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 improves the installation stability and overall strength of the battery pack by ensuring a stable connection between the battery cell and the casing, allowing for effective force dispersion and increased load-bearing capacity, thereby enhancing the mechanical performance and safety of the battery pack.
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 is bonded with the at least part of the inner surface of the battery pack casing through the filling layer
Data Source
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AI summary
The disclosure relates to a battery pack includes at least one battery cell (2) which is located in battery pack casing (1) and has pole end face (21) and explosion-proof valve (22) on the pole end face (21); barrier assembly (3) is installed on battery cell (1) and between pole end face (21) and inner surface of battery pack casing (1), inner surface of battery pack casing (1), pole end face (21) and barrier assembly (3) jointly define exhaust channel; explosion-proof valve (22) is in exhaust channel; filling layer (5) is made of an adhesive colloid and located outside exhaust channel and used for filling a gap between at least part of an outer surface of battery cell (2) and at least part of inner surface of battery pack casing (1).