Battery Holder Recess Adhesive Fixing for Vibration-Stable Cell Packs
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Solution Overview
Problem
Existing battery packs face challenges in reliably fixing secondary battery cells to the holder due to issues with adhesive application, leading to potential disconnection of the connection with the lead plate, especially under vibrations or impacts, and difficulty in controlling the adhesive amount and preventing it from adhering to unintended portions.
Innovation Solution
A battery pack design with a battery holder divided into first and second storage tubes, where the second storage tubes have recesses for adhesive application, allowing uniform fixing of secondary battery cells by applying adhesive to gaps between adjacent cells, and a manufacturing method involving uncured adhesive application and curing within these recesses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive is applied to the surface of the holder at the time of assembling, then the secondary battery cell can be fixed to the holder, but the adhesive application amount cannot be adjusted and may adhere to unintended portions
Solution Approach 1:
The adhesive is applied to the inner surface of the storage tube before the secondary battery cell is inserted, rather than applying it to the holder surface during assembly. This preliminary action allows for more controlled and precise adhesive application, as the adhesive is contained within the storage tube where it cannot spread to unintended areas.
Solution Approach 2:
The adhesive application process is separated from the main assembly process. The adhesive is applied to the storage tube in a separate step before assembly, extracting the adhesive application function from the assembly operation itself. This allows for better control over adhesive placement and prevents contamination of the holder surface.
2Reliability
If adhesive is applied in a state where the secondary battery cell is exposed from the holder opening, then the cell can be fixed, but the adhesive amount is difficult to control uniformly
Solution Approach 1:
The adhesive is applied to the storage tube before the secondary battery cell is inserted, rather than attempting to apply it uniformly to the exposed cell during assembly. This preliminary application ensures consistent adhesive distribution on the storage tube inner surface, which then contacts the cell uniformly upon insertion.
Solution Approach 2:
The storage tube inner surface acts as an intermediary between the adhesive and the secondary battery cell. By applying adhesive to the storage tube rather than directly to the cell, the storage tube serves as a mediator that ensures uniform adhesive distribution and contact with the cell surface.
3Reliability
If adhesive is applied to fix the secondary battery cell, then the connection stability improves, but the adhesive may expose on the holder surface and get dirty
Solution Approach 1:
The adhesive is extracted from the external holder surface and placed inside the storage tube. This separation removes the harmful effect of adhesive exposure and contamination from the system, as the adhesive remains contained within the storage tube where it cannot expose or contaminate external surfaces.
Solution Approach 2:
The potential harm of adhesive exposure is converted into a benefit by using the storage tube as a containment structure. The storage tube that would otherwise simply hold the cell now also serves to contain and control the adhesive, preventing contamination while maintaining fixation functionality.
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
Ensures reliable fixation of secondary battery cells by uniformly controlling adhesive application, preventing adhesive exposure on the holder's surface, and enhancing the connection stability under vibrations, thus improving the overall reliability of the battery pack.
Implementation Method 1
an adhesive is interposed between the recess of each of the second storage tubes and a corresponding one of the plurality of secondary battery cells
Data Source
AI summary
A secondary battery cell can be fixed to a battery holder with high reliability. Battery pack 100 includes a plurality of secondary battery cells 1 and battery holder 20 including a plurality of storage tubes 22 that respectively hold the plurality of secondary battery cells 1. Battery holder 20 is divided into at least first divided holder 21A and second divided holder 21B in the length direction of secondary battery cell 1, and first storage tube 22A of first divided holder 21A and second storage tube 22B of second divided holder 21B are joined to form a cell storage space for storing secondary battery cell 1. At least a part of second storage tube 22B has recess 24 formed on at least a part of the inner surface thereof, and adhesive 50 is interposed between recess 24 of storage tube 22 and secondary battery cell 1.