Cylindrical Cell Pack Layout for Higher Space Utilization
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Solution Overview
Problem
Power batteries using cylindrical cells have a poor size to energy storage volume ratio, leading to low space utilization and inadequate endurance life for electric vehicles.
Innovation Solution
A cell module design where cylindrical cells are projected onto a tray along their height direction, optimizing the area ratio of projections to tray area and volume ratios to enhance space utilization and heat dissipation, thereby increasing the endurance life of power batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If cylindrical cells are arranged in a conventional power battery system, then the number of cells can be increased to achieve higher power capacity, but the space utilization rate deteriorates and the size to energy storage volume ratio decreases
Solution Approach 1:
The patent transitions from conventional two-dimensional planar arrangements of cylindrical cells to a three-dimensional spatial configuration using a tray structure. The tray enables cells to be positioned at different heights and angles, optimizing the use of vertical and horizontal space simultaneously. This dimensional change allows for higher cell density while maintaining adequate space for thermal management and structural requirements.
2Quantity of substance
If more cylindrical cells are packed into the power battery, then the energy storage capacity increases, but the heat dissipation performance deteriorates due to reduced space for thermal management
Solution Approach 1:
The tray structure creates localized zones with different functions: some areas are optimized for cell placement while other areas provide channels and spaces for coolant flow. This local differentiation allows the system to achieve high energy density in cell regions while maintaining effective heat dissipation in the fluid channels, resolving the contradiction between energy storage capacity and thermal management.
3Volume of moving object
If the area ratio of cell projections to tray area is increased to improve space utilization, then the size to energy storage volume ratio improves, but the structural stability and accessibility for maintenance may deteriorate
Solution Approach 1:
The tray is designed as a segmented structure with multiple support regions and access points. The segmentation allows the tray to maintain structural integrity while providing pathways for thermal management components and access to individual cells. This modular approach enables high space utilization without compromising structural stability or maintainability.
Data Source
AI summary
The present application relates to the technical field of power batteries, and discloses a cell module, a power battery, and an electric vehicle. The cell module comprises a tray and a plurality of cylindrical cells; the cylindrical cells are arranged on the tray; the sum of the projection areas of the plurality of cylindrical cells on the tray in the height direction of the cylindrical cells is S, the projection area of the tray in the height direction of the cylindrical cells is A, and S/A is greater than or equal to 0.67.