Assembled Battery Cell Fixation via Adhesive in Holder
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Solution Overview
Problem
In assembled batteries, variations in unit cell dimensions cause rattling between cells and holders due to vibrations or impacts, as cells are not securely fixed within cylindrical holders.
Innovation Solution
The use of a holder with cell hold portions featuring holding holes and an adhesive that solidifies between the cell and holder, ensuring secure fixation, along with a resin sheet to prevent adhesive leakage and facilitate filling, and chamfered edges for easy adhesive flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If cells are simply inserted into cylindrical holders without fixation, then the assembly process is simple, but cells move during vibration or impact causing rattling
Solution Approach 1:
The holder is pre-formed with holding holes that are sized to receive the cells, and the assembly process is designed to automatically position cells correctly during insertion, eliminating the need for post-assembly fixation operations while ensuring stable cell positioning
Solution Approach 2:
The holding hole acts as an intermediary structure between the cell and the holder body, providing a dedicated receptacle that mechanically constrains the cell in multiple directions, preventing rattling while maintaining assembly simplicity
2Ease of operation
If the holding hole inside diameter is made larger to accommodate cell dimension variations, then cell insertion is easier, but the gap between cell and holder increases allowing more movement
Solution Approach 1:
The holding hole is designed with a specific inside diameter that is larger than the cell outside diameter by a controlled amount (0.1-2.0 mm), creating an optimal gap that allows easy insertion while maintaining sufficient mechanical constraint to prevent excessive cell movement during operation
Solution Approach 2:
The patent specifies precise parameter ranges for the holding hole inside diameter (0.1-2.0 mm larger than cell outside diameter) to optimize the balance between insertion ease and fixation stability, ensuring reliable cell positioning without excessive clearance
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 ensures that cells remain stationary during vibrations or impacts, preventing rattling and ensuring secure attachment to the holder, thereby enhancing the battery's stability and reliability.
Implementation Method 1
an adhesive provided so as to be solidified in a gap between an outer peripheral surface of a part of the cell, the part of the cell being placed inside the holding hole and an inner peripheral surface of the cell hold portion
Data Source
AI summary
An assembled battery includes: a holder including a plurality of cell hold portions each having a first surface and a second surface facing an opposite side to the first surface and each having a holding hole, which is a hole penetrating through between the first surface and the second surface, and a connection portion that connects the plurality of cell hold portions to each other; a plurality of cells each having an outside diameter smaller than an inside diameter of the holding hole and inserted into the holding hole of each of the plurality of cell hold portions; and an adhesive provided so as to be solidified in a gap between an outer peripheral surface of a part of the cell which is placed inside the holding hole and an inner peripheral surface of the cell hold portion which constitutes the holding hole.