Stepped Battery Pack Casing for Complete Adhesive Immersion
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Solution Overview
Problem
Existing battery packs face issues with adhesive fluidity, leading to incomplete immersion of cells and potential assembly problems due to uneven adhesive distribution.
Innovation Solution
The battery pack design incorporates a casing with a stepped inner bottom surface that creates height differences, enhancing adhesive flow and ensuring complete cell immersion, and includes a carrying member with partitions to manage gas discharge and particulate matter, improving adhesive fluidity and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive is injected through the top of the casing to immerse cells, then cells are packaged by adhesive, but adhesive exhibits poor fluidity and may not completely immerse all cells
Solution Approach 1:
The patent introduces a height dimension by creating a stepped inner bottom surface with multiple levels. Adhesive is injected from the top and flows down through the height differences created by the stepped surface, transforming the adhesive injection from a horizontal spread problem to a vertical flow solution. This dimensional change enables complete cell immersion by utilizing gravity-driven flow through elevated injection points.
Solution Approach 2:
The stepped surface structure is pre-configured within the casing before adhesive injection. The elevated inner bottom surface creates predetermined flow paths and accumulation zones that guide adhesive movement. This preliminary structural preparation ensures that when adhesive is injected, it naturally flows along the stepped surfaces to reach all cells without requiring additional forcing mechanisms.
2Manufacturing precision
If conventional flat bottom casing is used, then structure is simple, but adhesive distribution is uneven and cells are not completely immersed
Solution Approach 1:
The inner bottom surface of the casing is segmented into multiple stepped levels rather than being a single flat surface. Each step creates a distinct zone for adhesive flow control. This segmentation divides the adhesive distribution process into manageable stages, with each step guiding the adhesive flow to specific areas, ensuring uniform distribution and complete cell immersion.
3Reliability
If carrying member is spaced apart from base plate, then exhaust channel is formed for gas discharge, but device complexity increases
Solution Approach 1:
The space between the carrying member and base plate serves multiple functions: it provides structural support for the carrying member, creates an exhaust channel for gas discharge from cell safety valves, and facilitates heat dissipation. By making this single spatial arrangement multi-functional, the patent avoids adding separate components for each function, thereby limiting the increase in device complexity while achieving reliable gas discharge capability.
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
The design ensures uniform adhesive distribution, facilitating complete cell immersion and simplifies assembly, while reducing the risk of gas discharge complications and particulate matter blockages.
Implementation Method 1
the inner bottom surface of the casing has a stepped surface for dividing the inner bottom surface of the casing into at least two placement areas having a height difference in the height direction of the casing... providing a force to the adhesive located in the placement area with a higher height, so as to enable the adhesive to flow towards the placement area with the lower height
Data Source
AI summary
Disclosed is a battery pack, including: multiple cells; a casing, wherein the inner bottom surface of the casing has a stepped surface for dividing the inner bottom surface of the casing into at least two placement areas having a height difference in the height direction of the casing, and the cells are placed in each of the placement areas. With stepped surfaces disposed on the inner bottom surface of the casing, the battery pack provided by the present disclosure may form at least two placement areas with height differences within the casing, making it possible to provide a force to the adhesive located in the placement area with a higher height, helping the adhesive flow toward the placement area with lower height. This helps improve the fluidity of the adhesive within the casing, and making it easier for the adhesive to fully fill various areas of the casing.