Cylindrical Cell Module Layout With Variable Row Spacing Cooling
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Solution Overview
Problem
Cylindrical cell modules in lithium batteries have an incompact structure and high manufacturing costs due to equal spacing between adjacent rows of cells, necessitating large liquid cooling plates that increase overall size and cost.
Innovation Solution
A cell module design with variable spacings between cell rows, utilizing a liquid cooling plate between rows with different spacings and a cell fixing bracket with detachable bracket bodies and splicing seats, allowing for compact arrangement and efficient heat exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If battery cells are connected in parallel to increase current discharge capability, then the current discharge capability is improved, but the internal resistance increases and uniformity of charge-discharge performance deteriorates
Solution Approach 1:
The battery cell is divided into multiple independent battery modules (first battery module, second battery module, etc.) connected in series within the cell. Each module can be independently configured with different numbers of battery units, allowing optimization of current discharge capability for each module while maintaining overall cell performance uniformity.
Solution Approach 2:
Different battery modules within the same cell can have different numbers of battery units connected in parallel, creating local variations in current discharge capability. This allows each module to be optimized for its specific function while maintaining overall cell performance.
2Temperature
If battery units are connected in series to increase voltage, then the voltage is improved, but the current discharge capability decreases
Solution Approach 1:
The battery cell is segmented into multiple battery modules connected in series, where each module contains battery units connected in parallel. This segmentation allows the cell to achieve high voltage through series connection of modules while maintaining current discharge capability through parallel connection within each module.
3Strength
If a rigid structure is used to maintain cell shape and provide mechanical strength, then the strength is improved, but the adaptability to different pack layouts deteriorates
Solution Approach 1:
The battery cell uses a flexible wrapper instead of a rigid structure, allowing the cell to adapt to different pack layouts and mechanical conditions. The wrapper provides necessary mechanical protection while maintaining flexibility for various configurations.
Solution Approach 2:
The battery cell is enclosed in a flexible wrapper that can conform to different shapes and layouts required by the battery pack design, replacing rigid structural elements with flexible thin-film encapsulation.
4Power
If multiple battery units are connected in parallel within a module to increase current discharge capability, then the current discharge capability is improved, but the manufacturing complexity increases
Solution Approach 1:
The battery cell is divided into multiple battery modules, each containing a specific number of battery units connected in parallel. This segmentation allows for standardized manufacturing of modules that can be assembled in different configurations to meet various current discharge requirements.
Data Source
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AI summary
Provided are a cell module and a battery system. The cell module includes: a cell fixing bracket, multiple rows of cell groups and a liquid cooling plate. Specifically, all of the cell groups are disposed on the cell fixing bracket, each row of cell group includes multiple cells, each row of cell group other than a first row of cell group and a last row of cell group has a first spacing H from an adjacent row of cell group, and has a second spacing h from another adjacent cell group, and the first spacing H is greater than the second spacing h. The liquid cooling plate is disposed between the two rows of cell groups spaced apart by the first spacing H, and is configured to regulate the temperature of multiple cells near the liquid cooling plate. The liquid cooling plate is installed between the two rows of cell groups separated by the first spacing, thus the distance between the two rows of cell groups with no liquid cooling plate disposed therebetween can be saved on the basis that the temperature of the cells can be controlled, so that the structure of the cell module can be more compact and the overall size can be small. The battery system according to the present application employs the cell module described above, so the battery system has a small overall size and is beneficial to reduce costs.