Battery Power Supply Heat-Blocking Layer Design
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Solution Overview
Problem
Conventional power supply devices with secondary batteries face safety issues due to high-temperature exhaust gas damaging non-heat resisting components like circuit boards and battery blocks when the exhaust valve opens, potentially leading to thermal runaway and fires.
Innovation Solution
A power supply device configuration featuring a heat-blocking layer with a layered structure of molten and insulating layers between battery blocks and non-heat resisting members, which absorbs and insulates heat energy from exhaust gas, preventing direct contact and ensuring safety even when the exhaust valve is open.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an exhaust valve is provided to discharge high-temperature exhaust gas when internal pressure increases, then the safety of the battery is improved, but the exhaust gas damages non-heat resisting members such as circuit boards and battery blocks
Solution Approach 1:
A heat-blocking layer is introduced as an intermediary component between the exhaust valve and non-heat resisting members. This layer specifically blocks heat and exhaust gas, preventing the harmful effects of high-temperature exhaust gas on circuit boards and battery blocks while maintaining the safety function of the exhaust valve
Solution Approach 2:
The heat-blocking layer is divided into multiple layers with different functions: a molten layer that absorbs heat through phase change, an insulating layer that provides thermal insulation, and a reflective layer that reflects radiant heat. This segmentation allows each layer to address specific aspects of heat blocking
2Object-affected harmful factors
If a heat-blocking layer with layered structure is introduced to protect non-heat resisting members, then the protection against exhaust gas damage is improved, but the device complexity increases
Solution Approach 1:
The heat-blocking layer serves multiple functions simultaneously: it blocks heat transfer, insulates against high temperatures, reflects radiant heat, and physically blocks exhaust gas. This multi-functionality reduces the need for separate protective components, thereby limiting the increase in device complexity
Solution Approach 2:
The heat-blocking layer uses composite material structure combining different materials with complementary properties: materials that melt at specific temperatures for heat absorption, ceramic or fiberglass materials for insulation, and metallic coatings for heat reflection. This composite approach achieves superior protection while maintaining reasonable structural complexity
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 reduces the temperature of high-temperature exhaust gas and prevents damage to non-heat resisting components, ensuring a high level of safety by efficiently absorbing heat energy and inhibiting gas penetration, thereby preventing thermal runaway and fires.
Implementation Method 1
molten layer 7, which is potting resin 107A, is provided between circuit board 104 and exhaust duct 105
Implementation Method 2
heat-blocking layer 6 including molten layer 7 interposed between battery block 3 and non-heat resisting member 10
Implementation Method 3
insulating layer 8 having heat-insulating properties of not being deformed by exhaust gas from the exhaust valve
Data Source
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AI summary
The present invention prevents high-temperature exhaust gas from damaging a non-heat resisting member such as a circuit board or a battery block, and thereby ensures a high level of safety even when an exhaust valve is open. A power supply device includes battery block (3) and non-heat resisting member (10) facing battery block (3). Battery block (3) has a plurality of secondary batteries (1) disposed in fixed positions by battery holder (2) and each having an exhaust valve on exhaust-side end surface (1A). Non-heat resisting member (10) is formed of circuit board (4) or any of a plurality of secondary batteries (1). Air layer (5) and insulating layer (8) are disposed between battery block (3) and non-heat resisting member (10). Insulating layer (8) has heat-insulating properties of not being deformed by exhaust gas from the exhaust valve. Air layer (5) is disposed on a side of battery block (3). Molten layer (7) and insulating layer (8) form heat-blocking layer (6) that has a layered structure. Heat-blocking layer (6) protects non-heat resisting member (10) from the exhaust gas discharged into air layer (5).