Battery Outer Shell Structure for Higher Cell Accommodation Volume
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Solution Overview
Problem
The existing stacked battery design, where the bottom shell is integrally formed by stamping, results in a larger stamping angle at the outer periphery, reducing the effective volume of the accommodation chamber and thus the battery capacity due to the limitations of the stamping process.
Innovation Solution
An outer shell structure comprising a cover plate, a bottom plate, and a shell body with openings at both ends, which are welded to form an accommodation chamber, increasing the effective volume and energy density by optimizing the thickness and welding seams of the components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the bottom shell is integrally formed by stamping, then the manufacturing process is simple, but the stamping angle at the outer periphery is large, reducing the effective volume of the accommodation chamber
Solution Approach 1:
The bottom shell is divided into multiple parts: a bottom plate and a shell body. The shell body includes a first side wall extending from the bottom plate and a second side wall extending from the bottom plate. This segmentation allows each part to be formed with optimized dimensions, eliminating the large stamping angle problem while maintaining manufacturing simplicity.
Solution Approach 2:
Different parts of the bottom shell are given different local qualities. The bottom plate provides a stable base, while the shell walls are designed with specific thicknesses and angles optimized for their local functions. The first and second side walls have different configurations to optimize the accommodation chamber volume while maintaining structural integrity.
2Ease of manufacture
If the stamping angle at the outer periphery is large, then the stamping process is easier, but the effective volume of the accommodation chamber is reduced, decreasing battery capacity
Solution Approach 1:
By segmenting the bottom shell into a bottom plate and shell body components, the design achieves optimized wall angles that maximize the accommodation chamber volume. This allows the battery to accommodate more battery cells, directly increasing battery capacity while maintaining manufacturing feasibility.
3Device complexity
If the bottom shell is integrally molded, then the structure is simple, but the accommodation chamber volume is reduced due to stamping angle limitations
Solution Approach 1:
The bottom shell is segmented into a bottom plate and a shell body with first and second side walls. This segmentation increases structural complexity slightly but dramatically increases the accommodation chamber volume by eliminating the large stamping angle constraint, allowing for more efficient battery cell arrangement.
Solution Approach 2:
The design transitions from a two-dimensional stamped bottom shell to a three-dimensional structure with distinct bottom plate and shell body components. This dimensional change allows optimization of wall angles and thicknesses to maximize the accommodation chamber volume while maintaining structural integrity.
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 configuration enhances the battery capacity and energy density by maximizing the accommodation space within a given volume, overcoming the limitations of the stamping process that reduce effective volume and capacity in prior art designs.
Implementation Method 1
The cover plate, the shell body and the bottom plate are welded in turn, so that the accommodation space of the accommodation chamber achieves maximum.
Data Source
AI summary
The present application discloses an outer shell structure and a battery, the outer shell structure is used for carrying a battery cell. The outer shell structure includes a cover plate, a bottom plate and a shell body, where each of two opposite ends of the shell body both has an opening, the cover plate and the bottom plate cover on the two opposite sides of the shell body respectively; the cover plate, the shell body and the bottom plate together enclose to form an accommodation chamber for accommodating the battery cell; and the outer shell structure includes a conductive assembly disposed on the shell body. The present utility model improves the effective volume of the accommodation chamber of the battery and energy density of the battery.