Battery Pack Cell Holder Elastic Pinch Mechanism
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Solution Overview
Problem
Existing battery packs for electric power tools experience movement discrepancies between battery cells and electrode members due to external impacts or vibrations, leading to undesirable forces at connected points, which are not adequately suppressed by current cushioning solutions.
Innovation Solution
A battery pack design featuring a cell holder with cell holding portions that pinch and elastically support columnar battery cells, integrating them with the holder and case, while guide portions facilitate easy insertion and symmetrical placement ensures balanced support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a cushion member is inserted between the case and battery cells, then the battery cells are cushioned from external impacts, but the movement of battery cells relative to electrode members is not suppressed
Solution Approach 1:
The cell holder serves as an intermediary component between the battery cells and the case, providing both cushioning and positional constraint functions. The cell holder absorbs external impacts while simultaneously suppressing relative movement between battery cells and electrode members through its structural design with holding portions that engage the cells.
Solution Approach 2:
The invention merges the cushioning function and the positional constraint function into a single integrated cell holder structure. Instead of using separate cushioning members and fixing mechanisms, the cell holder combines both functions, eliminating the need for additional components while achieving both impact resistance and connection stability.
2Reliability
If the contact diameter of cell holding portions is smaller than the diameter of battery cell outer peripheral surface, then the battery cells are securely pinched and held, but the insertion of battery cells becomes more difficult
Solution Approach 1:
The cell holding portions are designed with elastic deformability, allowing them to dynamically adjust during insertion. When battery cells are inserted, the holding portions elastically deform to accommodate the cells, then recover to provide secure pinching and holding forces, thus achieving both easy insertion and secure holding.
Solution Approach 2:
The contact diameter of the cell holding portions is designed to be smaller than the battery cell diameter, creating an interference fit. This parameter difference enables the holding portions to elastically deform and grip the cells securely while still allowing insertion through controlled deformation.
3Reliability
If the cell holder structure is designed to integrate battery cells with the case, then movement is suppressed, but the device complexity increases
Solution Approach 1:
The cell holder is designed as a multi-functional component that simultaneously provides cushioning, positional constraint, and integration functions. By making the cell holder universal in its functionality, the invention achieves reliable integration of battery cells with the case without adding separate components, thus avoiding increased device complexity.
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 effectively suppresses movement of battery cells relative to the case and holder during impacts or vibrations, enhancing integration and reducing manufacturing costs through elastic support and balanced cell positioning.
Implementation Method 1
the contact diameter of the cell holding portions is configured such that it can increase when the battery cell is held, and the cell holding portions are configured to press the battery cell when the battery cell is held
Data Source
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AI summary
A contact diameter, which is formed by a cell holding portion (63) and receiving-partitioning portions (61), is configured to be smaller than the diameter of a columnar outer peripheral surface (330) of a battery cell (33). The cell holding portion (63) comes into contact with the columnar outer peripheral surface (330) of the battery cell (33) so as to hold the columnar outer peripheral surface (330). The contact diameter formed by the cell holding portion (63) and the receiving-partitioning portions (61) increases when the battery cell (33) is held, and the battery cell (33) is pressed when the battery cell (33) is held. A cell holder (50) is provided with the receiving-partitioning portions (61) that guide the battery cells (33) to be inserted and housed.