Long-Cell Battery Module Structure Without Pack Beams
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Solution Overview
Problem
Power battery packs for electric vehicles face low space utilization and energy density due to the limitations of small cell size, leading to inefficient assembly and reduced battery life.
Innovation Solution
Designing cells with a length greater than 600 mm and a width greater than the thickness, allowing for improved heat dissipation and arrangement within the battery pack, which eliminates the need for transverse and longitudinal beams, thereby increasing space utilization and energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If small-sized cells are used due to limitations of internal resistance and overcurrent, then cell safety is improved, but space utilization and energy density of the battery pack deteriorate
Solution Approach 1:
The battery pack is divided into multiple battery modules, each containing multiple cells arranged in series. This segmentation allows the use of smaller cells that meet safety requirements while organizing them into a compact modular structure that improves overall space utilization.
Solution Approach 2:
The patent transitions from traditional horizontal cell arrangement to a vertical arrangement where cells are stacked upright. This dimensional change allows better space utilization and enables the battery pack to achieve higher energy density while maintaining cell safety through proper thermal management in the vertical configuration.
2Stability of the object's composition
If traditional battery module assembly with end plates and side plates is used, then structural stability is improved, but space utilization deteriorates due to wasted space
Solution Approach 1:
The patent removes the traditional end plates and side plates from the battery module structure. Instead, it uses a simplified design where cells are directly mounted on the battery tray with support ribs, eliminating unnecessary components that wasted space and reducing overall module volume.
Solution Approach 2:
The battery tray is designed to serve multiple functions: it acts as the mounting structure for cells, provides structural support through integrated ribs, and serves as the base for the entire battery pack. This multi-functionality eliminates the need for separate end plates and side plates while maintaining structural stability.
3Ease of operation
If transverse beams and longitudinal beams are added to accommodate short cells, then assembly feasibility is improved, but device complexity and weight increase
Solution Approach 1:
The patent eliminates the complex transverse and longitudinal beam structure by using a simplified battery tray with integrated support ribs. This removal of unnecessary components reduces device complexity and weight while maintaining assembly feasibility through the rib-supported cell mounting design.
Solution Approach 2:
The battery tray with support ribs serves as both the mounting structure and the structural framework, replacing the need for separate transverse and longitudinal beams. This multi-functional design simplifies the overall structure while maintaining assembly feasibility.
4Temperature
If cells with length greater than 600mm are used, then heat dissipation ability is improved, but manufacturing difficulty increases
Solution Approach 1:
The patent specifies that cell length should be greater than 600mm to increase surface area for heat dissipation. This parameter change improves thermal management while the patent addresses manufacturing challenges through optimized cell design and arrangement in the battery module.
Data Source
AI summary
A cell, a power battery pack, and an electric vehicle are provided. The cell includes a cell body, and the cell body has a length L, a width H and a thickness D. The length L of the cell body is greater than the width H, the width H of the cell body is greater than the thickness D, the length L of the cell body is greater than 600 mm, and the length L and the width H of the cell body satisfy L/H=4-21.