Double-Cover Battery Pack for Blocking Module-to-Module Heat Transfer
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Solution Overview
Problem
In battery packs, overcharging can lead to explosions or fires due to battery module swelling, posing a risk of chain ignition of adjacent modules.
Innovation Solution
A battery pack with a double cover design, featuring a first lid with a through hole and a second lid with heat dissipation holes, along with a partition wall and a flow path forming member that bends to block heat transfer and guide heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single cover design is used, then the structure is simple, but heat transfer between adjacent battery modules can occur causing chain ignition
Solution Approach 1:
The single cover is divided into a first lid and a second lid that are spaced apart to form a double cover structure. This segmentation creates a physical barrier that prevents direct heat transfer between adjacent battery modules while maintaining structural simplicity. The first lid covers the battery module and the second lid is spaced apart from the first lid, forming an insulating gap that blocks thermal propagation.
Solution Approach 2:
The double cover structure acts as an intermediary barrier between adjacent battery modules. The first lid and second lid, spaced apart from each other, create an intermediate space that interrupts the direct heat transfer path. This intermediary structure prevents thermal runaway in one module from igniting adjacent modules while allowing the battery pack to maintain its functional integrity.
2Stability of the object's composition
If battery modules are disposed on the same plane for structural stability, then structural stability is improved, but the risk of chain ignition increases
Solution Approach 1:
The solution moves from a two-dimensional arrangement where modules are directly adjacent on the same plane to a three-dimensional configuration with the double cover structure. The first lid and second lid are spaced apart in the vertical dimension, creating a thermal barrier that interrupts heat transfer paths while maintaining the horizontal structural stability of the battery pack assembly.
3Device complexity
If no heat dissipation path is provided, then the structure is simpler, but heat accumulation increases the risk of explosions and fires
Solution Approach 1:
The double cover structure provides localized heat dissipation functionality at critical thermal interfaces. The first lid and second lid are positioned to create ventilation channels and heat dissipation paths at the boundaries between battery modules, allowing heat to escape from specific high-risk areas without requiring a complete redesign of the entire battery pack structure.
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
Prevents chain ignition of adjacent battery modules by blocking heat transfer and providing a heat dissipation path, thereby reducing the risk of explosions and fires.
Implementation Method 1
when the battery module disposed on one side of the partition wall ignites, the flow path forming member may be bent in a direction of the battery module disposed on another opposite side of the partition wall due to heat from the ignition
Implementation Method 2
a case accommodating the battery modules, wherein the case includes the double cover disposed at an upper portion of the case, and the double cover includes: a first lid disposed above the battery module and having a through hole; and a second lid above the first lid and spaced apart from the first lid
Implementation Method 3
a partition wall between the battery modules positioned on left and right sides in the case
Data Source
AI summary
A battery pack with a double cover includes a plurality of battery modules; and a case accommodating the battery modules, the case includes the double cover disposed at an upper portion of the case, and the double cover includes a first lid disposed above the battery module and having a through hole; and a second lid above the first lid and spaced apart from the first lid.