Battery Pack Dual Sealing for Watertight Coolant Pipe Interfaces
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Solution Overview
Problem
Conventional battery packs with water-cooled systems face challenges in maintaining a tight watertight structure, risking coolant leakage into the battery cells.
Innovation Solution
The battery pack incorporates a dual sealing system, comprising a first sealing unit between the coolant inflow and outflow pipes and the pack case, and a second sealing unit between the inner pipe of the coolant pipes and the cooling pipe unit, utilizing O-ring members for enhanced sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a water-cooled cooling system is implemented in a battery pack, then cooling efficiency is improved, but the risk of coolant leakage into battery cells increases
Solution Approach 1:
The sealing system is divided into multiple independent sealing units: a first sealing unit between the coolant pipe and pack case, and a second sealing unit between the connection pipe and cooling pipe unit. This segmentation allows each sealing unit to independently perform its sealing function, improving overall reliability while maintaining cooling efficiency.
Solution Approach 2:
The patent implements preventive sealing measures by installing multiple sealing units before any potential leakage can occur. The first sealing unit prevents coolant from leaking at the pack case interface, while the second sealing unit provides an additional barrier at the connection pipe interface, cushioning against potential failure points.
2Reliability
If a single sealing unit is used between coolant pipes and pack case, then device complexity is reduced, but sealing reliability is insufficient
Solution Approach 1:
The sealing function is segmented into two distinct sealing units positioned at different locations: the first sealing unit at the pack case interface and the second sealing unit at the connection pipe interface. This segmentation distributes the sealing responsibility across multiple points, enhancing reliability without creating a single complex sealing mechanism.
Solution Approach 2:
The first sealing unit acts as an intermediary sealing element between the coolant pipe and pack case, while the second sealing unit serves as an intermediary at the connection pipe interface. These intermediary sealing units provide additional protection against coolant leakage without requiring the main sealing structure to be overly complex.
Data Source
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AI summary
Disclosed is a battery pack, which includes a battery module including a battery cell and having a cooling pipe unit at which a coolant flow path for cooling the battery cell is formed, a pack case configured to accommodate the battery module, a coolant inflow and outflow pipe configured to supply a coolant to the coolant flow path and discharge the coolant from the coolant flow path to the outside of the pack case, a first sealing unit disposed between the coolant inflow and outflow pipe and the pack case, and a second sealing unit disposed between the coolant inflow and outflow pipe and the cooling pipe unit.