Battery Pack Heat-Resistant Cap for Exhaust Gas Discharge
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional battery packs face safety challenges due to the vigorous ejection of high-temperature exhaust gas from lithium ion batteries, which can melt the exterior case and ignite, compromising safety.
Innovation Solution
A battery pack design that includes a battery block, a heat-resistant cap, a circuit board, and an exterior case, where the exhaust gas passes through a series of discharge gaps and ventilation gaps, reducing its energy before being discharged outside through an exhaust portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a hole is provided in the exterior case to discharge exhaust gas, then the exhaust gas can be discharged to outside, but the high-temperature exhaust gas may melt the exterior case and ignite, compromising safety
Solution Approach 1:
A heat-resistant cap is introduced as an intermediary component between the discharge valve and the exterior case. This cap serves as a mediator that can withstand the high-temperature exhaust gas while directing it through controlled pathways, preventing direct contact between the hot gas and the exterior case that would otherwise be damaged by the thermal exposure
Solution Approach 2:
The exhaust gas discharge pathway is segmented into multiple sections: the discharge valve, the heat-resistant cap with closing plate portion and peripheral wall portion, and the exhaust portion in the exterior case. This segmentation allows each component to perform its specific function - the cap segments the hot gas flow from the exterior case structure, enabling safe discharge
2Reliability
If the discharge valve opens to release internal pressure, then safety against pressure rupture is ensured, but high-temperature gas is vigorously ejected which may cause fire or damage
Solution Approach 1:
The heat-resistant cap is pre-installed on the discharge valve before any abnormal condition occurs. The closing plate portion and peripheral wall portion are positioned in advance to form discharge gaps that will guide and cool the exhaust gas when the valve opens, preventing the harmful effects of vigorous high-temperature ejection before they can occur
Solution Approach 2:
The high-temperature exhaust gas that would normally be a hazard is converted into a controlled flow through the discharge gaps formed by the closing plate portion and peripheral wall portion. The gas flow is utilized to pass through the ventilation gap and exhaust portion in a controlled manner, transforming the potentially harmful vigorous ejection into a beneficial controlled discharge mechanism
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
This design effectively suppresses adverse effects from high-temperature exhaust gas, enhancing safety by reducing the kinetic and thermal energy of the exhaust gas before it is discharged, thereby preventing potential fires and damage to the exterior case.
Implementation Method 1
The battery pack is configured to cause the exhaust gas discharged from the discharge valve to pass through the ventilation gap from discharge gaps including the first discharge gap and the second discharge gap
Implementation Method 2
reducing the kinetic and thermal energy of the exhaust gas before it is discharged
Data Source
AI summary
In a battery pack, a heat-resistant cap is coupled to an end of a battery block including battery cells positioned at predetermined positions by a battery holder and a circuit board coupled to a first surface and accommodated in an exterior case. Each of the battery cells includes a discharge valve. A heat-resistant cap includes closing plate portion forming first discharge gap between the cap and an end surface of the battery block, and a peripheral wall portion forming a second discharge gap between the peripheral wall portion and the first surface of the battery block. A circuit board forms a ventilation gap between the circuit board and the first surface of the battery block. The ventilation gap communicates with the second discharge gap.