Battery Pack Case Beads for Uniform Coolant Flux
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Solution Overview
Problem
Middle- or large-sized battery packs face challenges in achieving uniform coolant flux distribution due to beads formed in the battery pack case, leading to reduced cooling efficiency and increased temperature differences between battery cells, which affects overall performance and lifespan.
Innovation Solution
The battery pack case is designed with beads in a concavo-convex shape to enhance structural stability while minimizing disruption to coolant flow, ensuring uniform coolant distribution and effective heat removal through optimized bead placement and inlet/outlet port design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If beads are formed in the battery pack case to improve structural stability, then strength against external force is improved, but coolant flux distribution uniformity deteriorates
Solution Approach 1:
The beads are positioned specifically in regions where structural reinforcement is needed while avoiding critical coolant flow paths. The concavo-convex structure provides localized strength enhancement without uniformly affecting the entire coolant flow field, thus resolving the contradiction between structural stability and coolant distribution uniformity.
Solution Approach 2:
The coolant inlet port and outlet port are strategically positioned to serve as intermediaries that guide coolant flow around the bead structures. This allows the beads to provide structural support while the port positioning ensures coolant can bypass the obstructions and maintain uniform distribution across the battery module.
2Strength
If beads are formed in the battery pack case, then structural stability is improved, but cooling efficiency deteriorates due to disrupted coolant flow
Solution Approach 1:
The beads are strategically positioned to provide structural reinforcement only in areas where mechanical support is critical, while leaving coolant flow paths relatively unobstructed. This localized approach maintains cooling efficiency by minimizing flow disruption while still achieving the necessary structural stability.
Solution Approach 2:
The concavo-convex bead structure adds dimensional complexity to the case design, creating a three-dimensional reinforcement pattern that provides structural strength without significantly blocking the two-dimensional coolant flow paths. This dimensional differentiation allows both structural and thermal management functions to coexist effectively.
3Reliability
If beads are formed in the battery pack case, then durability against external force is improved, but temperature distribution uniformity deteriorates
Solution Approach 1:
The beads are positioned to provide mechanical durability in specific high-stress regions while avoiding areas critical for thermal management. This selective placement ensures that temperature distribution remains uniform across the battery module while still achieving the necessary durability enhancement in structural critical zones.
Solution Approach 2:
The coolant ports are positioned to act as intermediaries that distribute coolant flow in a manner that compensates for the presence of beads. This ensures uniform temperature distribution across the battery module while the beads provide their durability-enhancing function in non-critical thermal zones.
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 improves coolant flux uniformity, enhances cooling efficiency, and extends the lifespan of battery cells by effectively managing heat accumulation and mechanical strength.
Implementation Method 1
a coolant for cooling the battery cells can flow from one side to the other side of the battery module in the direction perpendicular to the stacking direction of the battery cells
Implementation Method 2
beads formed in a concavo-convex shape for improving the structural stability of the battery pack case against an external force
Implementation Method 3
a large amount of heat is generated from the high-power, large-capacity secondary battery during the charge and discharge of the battery cells. If the heat, generated from the unit cells during the charge and discharge of the unit cells, is not effectively removed
Data Source
AI summary
A middle- or large-sized battery pack case is provided in which a battery module having a plurality of stacked battery cells is mounted, wherein the battery pack case is provided with a coolant inlet port and a coolant outlet port, which are disposed such that a coolant for cooling the battery cells can flow from one side to the other side of the battery module in the direction perpendicular to the stacking direction of the battery cells. The battery pack case includes beads formed in a concavo-convex shape for improving the structural stability of the battery pack case against an external force, the beads being constructed in a structure in which the beads do not disturb the flow of the coolant from the coolant inlet port along the advancing direction of a fluid in a flow space defined between the coolant inlet port and the battery module.