Battery Module Air Vent Member for Gas Discharge and Moisture Blocking
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Solution Overview
Problem
Vehicle-mounted battery packs require effective venting structures to discharge internal gases while preventing external moisture from entering, which is crucial for safety and preventing high voltage insulation issues due to harmful gas generation and external humidity.
Innovation Solution
A battery module design featuring a module housing with an air-tight venting system that discharges internal gases while blocking external moisture, incorporating integrally molded cell covers with cooling channels, air-tight bus bars and terminals, and a voltage sensing module, ensuring secure gas discharge and moisture exclusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a venting structure is provided to discharge internal gas, then gas discharge capability is improved, but moisture sealing performance deteriorates
Solution Approach 1:
A hydrophobic membrane is introduced as an intermediary component in the venting structure. This membrane selectively allows internal gas to pass through while blocking external moisture from entering the battery module, thus resolving the contradiction between gas discharge capability and moisture sealing performance
Solution Approach 2:
The venting structure is designed with spatially varying properties: the hydrophobic membrane is positioned specifically at the venting opening to provide selective permeability, while other parts of the housing maintain full sealing. This localized application of different material properties allows gas discharge at the venting point while maintaining overall moisture protection
2Object-affected harmful factors
If a sealing structure is provided to prevent moisture ingress, then moisture sealing performance is improved, but gas discharge capability deteriorates
Solution Approach 1:
The hydrophobic membrane in the venting structure is designed with porous characteristics that allow gas molecules to pass through while the hydrophobic surface tension prevents liquid moisture from penetrating. This porous material with selective permeability simultaneously achieves both moisture sealing and gas discharge functions
Solution Approach 2:
The venting structure utilizes changes in material parameters, specifically the surface tension and pore size of the hydrophobic membrane, to differentiate between gas and moisture. The membrane's physical parameters are optimized to permit gas flow while maintaining resistance to liquid moisture penetration
3Reliability
If terminals are provided to pass through the housing for electrical connection, then electrical connectivity is improved, but sealing performance deteriorates
Solution Approach 1:
Sealing rubbers are used as flexible sealing elements around the terminals where they pass through the housing. These flexible membranes maintain electrical connectivity while providing a moisture barrier, allowing the terminal to penetrate the housing without compromising the sealing performance
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 effectively prevents gas leakage and moisture ingress, enhancing high voltage insulation and reliability of the battery system by ensuring safe gas discharge and maintaining system stability.
Implementation Method 1
an air vent member air-tightly disposed at one side of the module housing to discharge inner gas of the module housing to the outside, the air vent member being configured to block external gas from entering into the module housing
Implementation Method 2
a cooling channel through which a cooling fluid for cooling a cell flows
Implementation Method 3
a cooling channel through which a cooling fluid for cooling a cell flows
Implementation Method 4
a sealing structure which blocks moisture from outside from flowing therein
Data Source
AI summary
A battery module includes a cell assembly comprising a plurality of cells; a module housing including an upper housing having a closed inner space accommodating the cell assembly and a lower housing air-tightly attached to a lower end of the upper housing; and an air vent member air-tightly disposed at one side of the module housing to discharge inner gas of the module housing to the outside, the air vent member being configured to block external gas from entering into the module housing.