Battery Pack Waterproof Bag with Check Valve for Thermal Management
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Solution Overview
Problem
Conventional battery packs face increased weight and reduced thermal conductivity due to the need for a large volume of potting resin to fill the space between battery cells and the battery case, which compromises heat radiation and waterproofing.
Innovation Solution
A battery pack design featuring a waterproof bag with a check valve that allows air to escape, ensuring the potting resin contacts the battery cells tightly, minimizing volume while maintaining waterproofing and enhancing thermal conductivity, and includes a manufacturing method to inject the resin efficiently, even in complex shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the space between battery cell and battery case is filled with potting resin to thermally couple them, then heat radiation is improved, but the volume of potting resin increases and weight increases
Solution Approach 1:
The invention extracts the air from the waterproof bag by using a check valve to exhaust the inner air, creating a vacuum environment. This allows the potting resin to tightly contact the battery cells without needing to fill the entire space between the battery cells and the battery case, thereby reducing the volume and weight of the potting resin while maintaining effective thermal coupling.
Solution Approach 2:
The invention changes the pressure parameter inside the waterproof bag by exhausting the air to create a negative pressure environment. This parameter change enables the potting resin to be drawn into tight contact with the battery cells through pressure differential, achieving effective thermal coupling with minimal resin volume.
2Temperature
If the space between battery cell and battery case is filled with potting resin to thermally couple them, then heat radiation is improved, but the volume of injected potting resin increases
Solution Approach 1:
The invention extracts the air from the waterproof bag by using a check valve to exhaust the inner air, creating a vacuum environment. This allows the potting resin to tightly contact the battery cells without needing to fill the entire space between the battery cells and the battery case, thereby reducing the volume and weight of the potting resin while maintaining effective thermal coupling.
Solution Approach 2:
The invention changes the pressure parameter inside the waterproof bag by exhausting the air to create a negative pressure environment. This parameter change enables the potting resin to be drawn into tight contact with the battery cells through pressure differential, achieving effective thermal coupling with minimal resin volume.
3Temperature
If check valve is provided to exhaust inner air for tight contact, then thermal conductivity is improved, but device complexity increases
Solution Approach 1:
The check valve is designed to automatically exhaust the inner air from the waterproof bag without requiring external control mechanisms. The valve opens automatically when air needs to be exhausted and closes automatically to maintain the vacuum environment, enabling the system to self-regulate the internal pressure and achieve tight contact between the potting resin and battery cells.
Solution Approach 2:
The check valve acts as an intermediary component that mediates between the internal vacuum environment and the external atmosphere. It allows controlled air exhaust while maintaining the vacuum seal, enabling the tight contact of potting resin without requiring complex active control systems.
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 allows for efficient heat radiation from battery cells with minimal potting resin volume, improved thermal conductivity, and effective waterproofing, preventing thermal runaway and adverse effects on circuit boards.
Implementation Method 1
a waterproof bag having a check valve which opens only at the time of exhausting an inner air... by introducing the uncured pasty or liquid potting resin into the waterproof bag... the air inside the waterproof bag is exhausted through the check valve, and equally the potting resin tightly contacts the surfaces of the battery cells
Data Source
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Figure 5
AI summary
A battery pack comprises battery cells, a battery holder holding the battery cells, a waterproof bag storing the battery holder holding the battery cells as a waterproof structure, and a potting resin being injected in the waterproof bag, and the waterproof bag has a check valve which opens only at the time of exhausting an inner air. In a state that the potting resin is injected in the waterproof bag, the air inside the waterproof bag is exhausted through the check valve, and equally the potting resin tightly contacts the surfaces of the battery cells and the battery holder.