Cylindrical Battery Pack Cooling Plate for Temperature Equalization
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Solution Overview
Problem
Existing battery packs with cylindrical batteries arranged parallel to the bottom plate and perpendicular heat exchange plates suffer from premature conversion of the cooling medium to a gaseous state, leading to poor temperature equalization and inconsistency.
Innovation Solution
The battery pack design features a heat exchange plate with a specific ratio of inflow to outflow passage cross-sectional areas (3:2 to 4:1) and a liquid-to-gas conversion process, maintaining the cooling medium in a liquid state to enhance temperature equalization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the heat exchange passage uses equal cross-sectional areas for inflow and outflow passages, then the structure is simple and easy to manufacture, but the cooling medium converts to gaseous state prematurely and temperature equalization effect is poor
Solution Approach 1:
The patent applies asymmetry by setting different cross-sectional areas for inflow and outflow passages. Specifically, the sum of cross-sectional areas of inflow passages is 3:2 to 4:1 times that of outflow passages, creating an asymmetric flow path that maintains liquid state cooling medium and improves temperature equalization effect.
Solution Approach 2:
The patent changes the geometric parameters of the heat exchange passage by defining specific cross-sectional area ratios between inflow and outflow passages. This parameter optimization ensures the cooling medium remains in liquid state while improving heat exchange efficiency and temperature consistency.
2Stress or pressure
If the cross-sectional area of the outflow passage is large, then the flow resistance is low and the cooling medium flows smoothly, but the internal pressure is insufficient to prevent premature gas conversion
Solution Approach 1:
The patent creates asymmetric flow passages where inflow passages have larger cross-sectional areas (3:2 to 4:1 ratio) compared to outflow passages. This asymmetry generates sufficient internal pressure in the outflow section to prevent gas conversion while maintaining overall flow efficiency through the larger inflow sections.
Solution Approach 2:
The patent applies different cross-sectional area characteristics to different parts of the heat exchange passage. The inflow passages have larger areas for efficient medium supply, while outflow passages have smaller areas for pressure maintenance, creating localized quality differences that solve both pressure and flow efficiency requirements.
3Reliability
If the cross-sectional area of the inflow passage is small, then the structure is compact, but insufficient cooling medium enters the heat exchange passage reducing temperature equalization
Solution Approach 1:
The patent employs asymmetric design with inflow passages having 3:2 to 4:1 times the cross-sectional area of outflow passages. This asymmetric configuration increases the volume of inflow passages to ensure sufficient cooling medium supply for temperature equalization, while keeping outflow passages compact for pressure maintenance.
Solution Approach 2:
The patent applies different volume characteristics to different sections: inflow passages have larger volumes to supply sufficient cooling medium for effective temperature equalization, while outflow passages have smaller volumes to maintain compact structure and high internal pressure.
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 ensures improved temperature consistency and efficiency by maintaining the cooling medium in a liquid state, preventing premature conversion and enhancing heat exchange performance.
Implementation Method 1
the heat exchange passage is adapted to be in fluid communication with a cooling medium which is adapted to exchange heat with the cylindrical battery by a liquid-to-gas conversion process
Implementation Method 2
the heat exchange plate contacts with the cylindrical battery for heat exchange
Data Source
Figure 1
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AI summary
A battery pack includes a battery box (100), a cylindrical battery (200) and a heat exchange system. The battery box (100) includes a bottom plate (110); the cylindrical battery (200) is disposed in the battery box (100) and axially parallel to the bottom plate (110); the heat exchange system includes a heat exchange plate (300). A large surface of the heat exchange plate (300) is disposed on the bottom plate (110) relatively perpendicularly; the heat exchange plate (300) contacts with an end surface of the cylindrical battery (200); the heat exchange plate (300) has a heat exchange passage. The heat exchange passage includes at least one inflow passage (310) and at least one outflow passage (320). A ratio of a sum of cross-sectional areas of each of the inflow passages (310) to a sum of cross-sectional areas of each of the outflow passages (320) is 3:2 to 4:1.