Lower Plastic Assembly Geometry to Prevent Battery Pack Warping
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Solution Overview
Problem
The lower plastic member in energy-storage apparatuses is prone to warping during assembly, which can lead to structural integrity issues and potential safety hazards.
Innovation Solution
The design incorporates a lower plastic assembly with specific geometric features such as notches and sub-notches, and an arched explosion-proof grid configuration to prevent warping and ensure proper alignment, thereby enhancing structural stability and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the lower plastic member is made with simple geometry, then manufacturing is easier, but the member is prone to warping during assembly
Solution Approach 1:
The lower plastic member is divided into multiple functional regions including a first deformation portion with first notches, a second deformation portion with second notches, and reinforced portions with ribs. This segmentation allows each region to perform its specific function (stress relief, alignment, reinforcement) while maintaining overall structural stability and preventing warping during assembly.
Solution Approach 2:
Different regions of the lower plastic member are designed with different geometric properties tailored to their specific functions. The deformation portions have notches for stress relief, the reinforced portions have ribs for structural support, and the alignment portions have specific geometries for positioning. This local differentiation optimizes both manufacturability and structural stability.
2Stability of the object's composition
If deformation portions with notches are added to the lower plastic member, then warping is prevented, but manufacturing complexity increases
Solution Approach 1:
The notches and deformation portions are pre-designed into the lower plastic member's geometry before assembly. These features are formed during the molding process, allowing the stress relief and alignment functions to be built-in rather than requiring additional assembly steps or complex post-processing operations.
Solution Approach 2:
The geometric parameters of the lower plastic member (notch depths, rib heights, deformation depths) are optimized within specific ranges to achieve the desired balance between stress relief functionality and manufacturability. By controlling parameters like depth h1 of the first deformation portion and depth h2 of the second deformation portion, the design achieves structural stability without excessive complexity.
Data Source
AI summary
A lower plastic assembly, an end cover assembly, an energy-storage apparatus, and an electronic device are provided in the disclosure. The lower plastic assembly includes a first lower plastic member. The first lower plastic member comprises a first-lower-plastic-member body. The first-lower-plastic-member body has a first top surface and a first bottom surface opposite the first top surface, and further comprises a first part, a second part, and a first deformation portion. The first deformation portion is located between the first part and the second part in a length direction of the first-lower-plastic-member body. A ratio of a depth h1 of the first deformation portion to a height h2 of the first part ranges from 0.05 to 0.42 in a thickness direction of the first-lower-plastic-member body. A ratio of the depth h1 of the first deformation portion to a height h3 of the second part ranges from 0.16 to 0.6.