Round-Cell Battery Pack Layout for Vehicle Space and Assembly
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The integration and production of energy storage devices in motor vehicles, particularly those using round cells, are complex and costly, with issues related to production time, space utilization, and component reliability due to the shape factor and complexity of cell manufacturing processes.
Innovation Solution
The use of coated semifinished electrode products with a rectangular cross section, allowing for winding without additional separation steps, and a storage housing design that adapts to the vehicle's internal contour for efficient space use, along with a cylindrical cell format that reduces swelling forces and material usage, and the arrangement of round cells in layers to optimize installation space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If round cells are used for energy storage, then production costs are reduced, but integration complexity increases due to shape factor and large number of cells
Solution Approach 1:
The energy storage device is divided into multiple modules, each containing a specific number of round cells arranged in layers. This modular segmentation simplifies the integration process by breaking down the complex assembly into manageable units, while still utilizing the cost advantages of round cells.
Solution Approach 2:
Round cells are arranged in a layered configuration within modules, transitioning from simple linear arrangement to three-dimensional spatial organization. This dimensional approach optimizes space utilization and simplifies integration by creating standardized module units that can be systematically assembled.
2Device complexity
If prismatic cells or pouch cells are used, then integration complexity is reduced, but production costs increase
Solution Approach 1:
The device is organized into modules containing multiple round cells, creating standardized units that simplify integration while maintaining the production cost advantages of round cells. This segmentation approach achieves the simplicity of prismatic cell integration without their higher production costs.
3Shape
If carrier layer web is cut into separate coating regions after coating, then round cells can be formed, but production time increases and impurities may contaminate coatings
Solution Approach 1:
The carrier layer web is pre-configured with coating regions arranged in a continuous pattern before the coating process. This preliminary arrangement eliminates the need for post-coating cutting operations, reducing production time and preventing contamination of coatings with impurities from mechanical separation steps.
Solution Approach 2:
The coating process operates continuously on the carrier layer web without interruption for cutting or separation. The continuous production process maintains coating integrity and eliminates idle time associated with batch processing and mechanical separation operations.
4Reliability
If storage housing is designed to surround all high-voltage components, then protection is improved, but space utilization decreases
Solution Approach 1:
The storage housing is divided into multiple modules, each containing a specific number of round cells and providing protection for its components. This modular segmentation provides adequate protection for high-voltage components while optimizing space utilization by eliminating the need for a single large enclosing housing.
Solution Approach 2:
Multiple layers of round cells are nested within modules, with cooling elements and other components integrated within the same housing structure. This nested arrangement maximizes space utilization while maintaining comprehensive protection for all high-voltage components.
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 approach significantly reduces production time and costs, enhances space utilization, improves component reliability, and increases energy density by minimizing inactive parts and line losses, while also being more sustainable by reducing the need for aluminum in cell production.
Implementation Method 1
the semifinished electrode product is wound to form a round cell without the carrier layer web being subjected to a further separation method step in the longitudinal direction of the carrier layer web after the coating
Implementation Method 2
The storage housing is expediently of gas-tight design, such that gases that may leak out of the storage cells are collected
Implementation Method 3
If the active materials of the round cell expand due to operation, the housing is tensioned in the circumferential region. Therefore, comparatively thin housing cross sections can advantageously compensate for the forces resulting from the swelling
Implementation Method 4
The energy storage device comprises at least one electrochemical storage cell for storing electrical energy
Implementation Method 5
The round cells can each have at least one degassing opening at each of the two ends. The degassing openings are used to allow gases arising to escape from the cell can
Data Source
AI summary
An energy storage device for a motor vehicle includes a plurality of round cells for electrochemically storing energy, and a storage housing in which the plurality of round cells is provided. In the installed position, the round cells run substantially parallel to the vehicle transverse axis. The round cells are arranged within the storage housing in multiple layers in the direction of the vehicle vertical axis, wherein the number of layers varies in the direction of the vehicle longitudinal axis.