Battery Pack Coolant Pipe Sealing for Watertight Leak Isolation
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Solution Overview
Problem
Conventional battery packs face challenges in implementing a tighter watertight structure for water-cooled systems to prevent coolant leakage into battery cells.
Innovation Solution
A battery pack design incorporating a coolant inflow and outflow pipe system with multiple sealing units, including a planar O-ring member and axial O-ring members, spaced apart to ensure robust watertightness between the pipes and the pack case and cooling pipe unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single sealing unit is used between the coolant pipe and pack case, then the structure is simple, but the watertight reliability is insufficient
Solution Approach 1:
The sealing structure is divided into multiple independent sealing units (first sealing unit between pack case and intermediate pipe, second sealing unit between intermediate pipe and coolant pipe) instead of using a single sealing unit. This segmentation allows each sealing unit to independently prevent leakage at different interfaces, thereby improving overall watertight reliability while keeping each individual sealing unit simple.
Solution Approach 2:
An intermediate pipe is introduced as a mediator component between the coolant pipe and the pack case. This intermediate pipe serves as a bridge that enables multiple sealing units to be arranged in sequence, creating redundant sealing paths that enhance watertight reliability without requiring direct complex sealing between the coolant pipe and pack case.
2Object-affected harmful factors
If cooling water isolation is not properly implemented, then the structure is simpler, but coolant leakage to battery cells occurs
Solution Approach 1:
Multiple sealing units are arranged in sequence before coolant leakage can reach the battery cells, creating preventive barriers that stop coolant flow at multiple points along the path. This beforehand cushioning approach ensures that even if one sealing unit fails, other units prevent coolant from reaching the battery cells, thereby protecting against harmful effects in advance.
Solution Approach 2:
The sealing path is segmented into multiple independent sealing units positioned at different locations along the coolant flow path. This segmentation creates multiple isolation points that collectively prevent coolant leakage to battery cells, with each sealing unit contributing to the overall protection without requiring any single unit to be overly complex.
Data Source
AI summary
Discussed is a battery pack, which may include a battery module including a battery cell and having a cooling pipe unit including a coolant flow path for cooling the battery cell, 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 to discharge the coolant from the coolant flow path to an outside of the pack case, a first sealing unit between the coolant inflow and outflow pipe and the pack case, and a second sealing unit between the coolant inflow and outflow pipe and the cooling pipe unit.