Battery Module Exhaust Duct Shock Absorbing Layer
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Solution Overview
Problem
As battery capacities increase, so does the amount of flammable gas and fine particles discharged, posing a risk of ignition and compromising the safety of battery modules due to direct exposure of high-temperature gases and particles to oxygen outside the module.
Innovation Solution
A battery module design featuring a shock absorbing layer with a lower elastic modulus than the exhaust duct's first wall portion, positioned to absorb the shock and heat of discharged gases, reducing the risk of ignition by preventing fine particles from scattering and minimizing heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the capacity of batteries is increased to meet higher capacity demands, then the capacity of the battery module is improved, but the amount of gas discharged from the battery increases, leading to increased risk of ignition and decreased safety
Solution Approach 1:
A shock absorbing layer is introduced as an intermediary component between the exhaust duct and the high-temperature gas discharged from the battery valve. This layer absorbs the shock and heat of the discharged gas, preventing direct contact between the hot gas and the exhaust duct, thereby reducing the risk of ignition while allowing higher battery capacities
2Duration of action of stationary object
If a metal layer is provided on the exhaust duct surface to prevent damage from high-temperature gas, then the durability of the exhaust duct is improved, but the shock from discharged gas can still cause damage and the risk of ignition remains
Solution Approach 1:
The shock absorbing layer is positioned in advance on the exhaust duct surface to cushion the impact of discharged gas before it can cause damage. This layer absorbs the shock and heat energy of the high-temperature gas, protecting the exhaust duct from thermal damage and preventing ignition of discharged gas before it exits the module
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
Enhances the safety of the battery module by suppressing the scattering of fine particles and reducing the risk of ignition, while allowing for increased capacity without compromising structural integrity or increasing part count and cost.
Implementation Method 1
a shock absorbing layer that is disposed on a surface of a first wall portion of the exhaust duct facing the valve part, the surface facing an inside of the exhaust duct, the shock absorbing layer having a smaller elastic modulus than the first wall portion
Implementation Method 2
the shock absorbing layer having a smaller elastic modulus than the first wall portion
Data Source
Figure 1
Figure 2
AI summary
In order to enhance the safety of a battery module, battery module (1) including: battery stack (2) that has a plurality of batteries stacked, each of the batteries having a valve part that releases gas inside the battery; exhaust duct (38) that is connected to the valve part of each battery; and shock absorbing layer (39) that is disposed on a surface of first wall portion (34) of exhaust duct (38) facing the valve part, the surface facing an inside of the exhaust duct, shock absorbing layer (39) having a smaller elastic modulus than first wall portion (34).