Immersion-Cooled Battery Cell Packaging for Heat Transfer and Insulation
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Solution Overview
Problem
Existing lithium battery modules face issues with heat transfer efficiency and insulation when submerged in coolant, leading to potential leakage and corrosion, which compromises the longevity and safety of the battery.
Innovation Solution
A battery module design featuring a flexible packaging material with a first and second metal layer, where the second metal layer is electrically insulated and in direct contact with the coolant for heat exchange, while the cut edges are sealed to prevent coolant penetration and maintain electrical insulation, using a sealing frame to isolate the cut edges from the coolant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the battery cell is placed directly in the coolant for heat transfer, then heat transfer efficiency is improved, but the cut edges of the packaging layer are exposed to coolant causing leakage and corrosion
Solution Approach 1:
The patent applies nested packaging structure where a first packaging layer (metal-plastic composite film) and a second packaging layer (metal layer or metal foil tape) are wrapped around the battery cell in sequence. The cut edges of the first packaging layer are sealed within the second packaging layer, creating a nested configuration that prevents coolant from reaching the exposed metal edges while maintaining thermal contact between the battery and coolant.
2Strength
If the first metal layer is exposed at the cut edge for sealing, then sealing effectiveness is improved, but electrical insulation between metal layers deteriorates
Solution Approach 1:
The patent introduces an intermediary insulating layer (plastic layer or insulating coating) between the first metal layer and the second metal layer at the cut edges. This intermediary material maintains the sealing function of the metal layers while providing electrical insulation to prevent short circuits, thus resolving the contradiction between sealing effectiveness and electrical insulation.
3Reliability
If a second metal layer is added for protection, then corrosion resistance is improved, but device complexity increases
Solution Approach 1:
The patent employs thin film structures for both the first packaging layer (metal-plastic composite film) and the second packaging layer (metal foil tape or thin metal layer). These flexible thin films provide effective corrosion protection and sealing while minimizing the increase in structural complexity and maintaining a compact battery design.
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
Enhances heat transfer efficiency and maintains electrical insulation, preventing coolant leakage and corrosion, thereby extending the battery's operational life and ensuring safety.
Implementation Method 1
the second metal layer is in direct contact with the coolant... so that the heat transfer efficiency has a certain increase
Implementation Method 2
the second metal layer and the metal hard shell insulation... the insulation strength is greater than 2002V
Data Source
AI summary
A battery energy storage device includes a battery module. The battery cell is sheet-like, and the two surfaces of the battery cell along the thickness direction are the main heat dissipation surface of the battery cell. The box body comprises a bottom plate and a plurality of cooling plates arranged on the bottom plate; a holding space is formed between two adjacent cooling plates to accommodate the battery cell. The battery cell is installed in the accommodating space, and the main cooling surface on both sides of the battery cell is respectively fitted with two adjacent cooling plates.