Protrusions on Top Lid for Battery Heat Dissipation
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Solution Overview
Problem
Existing electricity storage devices for electric vehicles face inefficiencies in heat dissipation due to air spaces between the top lid and coolant, leading to reduced cooling effectiveness and potential coolant leakage or insufficient heat transfer.
Innovation Solution
The introduction of protrusions on the top lid of the enclosed container, which extend into the coolant, facilitates heat transfer and guides the coolant for efficient heat dissipation, eliminating the need for precise coolant measurement and enhancing the structural integrity of the lid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If coolant is injected to the upper limit level of the container and the top lid is then fixed, then the heat transfer from coolant to top lid is maximized, but coolant may leak out during lid fixation causing air to mix into the coolant and impede heat dissipation
Solution Approach 1:
The protrusion is formed on the top lid before coolant injection, creating a pre-defined structure that guides coolant placement. This preliminary structural preparation allows coolant to be injected to a lower level without risking leakage during lid fixation, while still ensuring effective heat transfer through the protrusion structure.
Solution Approach 2:
The protrusion acts as an intermediary structure between the top lid and the coolant. It extends into the coolant to establish thermal contact while maintaining a safety margin that prevents coolant leakage during lid fixation, thus mediating between heat transfer requirements and leakage prevention.
2Reliability
If a little less coolant is injected into the container and the top lid is fixed, then coolant leakage is prevented, but additional steps are required to add coolant after lid fixation and close the coolant inlet
Solution Approach 1:
The protrusion structure is formed on the top lid before lid fixation, creating a built-in guide structure. This preliminary preparation eliminates the need for separate coolant addition steps after fixation, simplifying the overall process while maintaining leakage prevention.
Solution Approach 2:
The protrusion serves multiple functions: it guides coolant placement during injection, prevents over-filling that could cause leakage, and provides thermal contact between coolant and top lid. This multi-functionality reduces the need for additional process steps.
3Weight of moving object
If the top lid is made thinner to reduce weight, then the overall device weight decreases, but the strength of the top lid becomes insufficient when coolant inlet is formed in it
Solution Approach 1:
The protrusion adds structural dimensionality to the top lid by extending downward into the container. This vertical extension reinforces the lid structure without increasing its planar dimensions or overall weight significantly, providing both structural support and thermal contact function.
Solution Approach 2:
The protrusion creates a localized structural reinforcement at the specific location where thermal contact is needed. Instead of making the entire lid thicker, only the protrusion region has additional material, providing localized strength and thermal contact while minimizing overall weight increase.
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 configuration ensures effective heat dissipation from the coolant to the top lid, even with air spaces present, and simplifies the coolant injection process, while maintaining the structural strength of the container, thereby enhancing the overall cooling efficiency and battery life.
Implementation Method 1
a protrusion, protruding from the top lid into the coolant, for transferring heat in the coolant to the top lid of the enclosed container
Implementation Method 2
the heated coolant will move upward in the enclosed container
Data Source
AI summary
An electricity storage device has: an enclosed container; an electricity storage unit contained in the enclosed container; a coolant, contained in the enclosed container, for cooling the electricity storage unit; and protrusions that extend into the coolant and conduct the heat of the coolant to a top lid of the enclosed container. The protrusions are formed on the top lid.