Electrode Tab Locking Wing for Battery PCM Positioning
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Solution Overview
Problem
The existing methods for electrically connecting a protection circuit module (PCM) to a bare cell in secondary batteries often result in poor workability due to the electrode tab being easily displaced during coupling, leading to potential soldering errors and circuit board bending.
Innovation Solution
The use of an electrode tab with a locking wing that is bent at an angle and formed by cutting and bending a base plate, which includes a locking plate and an insertion plate, to securely lock into a terminal hole on the circuit board, ensuring correct positioning and improved workability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrode tab is inserted into the terminal hole for electrical connection, then the electrical connection between PCM and bare cell is achieved, but the electrode tab is easily displaced during coupling, causing workability deterioration
Solution Approach 1:
The electrode tab is divided into multiple functional parts: a base plate for electrical connection, an insertion plate for positioning, and locking wings for fixation. This segmentation allows each part to perform its specific function optimally, preventing displacement while maintaining electrical connectivity.
Solution Approach 2:
The locking wings extend laterally from the insertion plate in opposing directions, utilizing the lateral dimension to engage with the terminal hole walls. This dimensional extension provides mechanical interlocking that prevents displacement in multiple directions, solving the workability issue.
2Reliability
If the electrode tab is inserted into the terminal hole, then electrical connection is established, but the circuit board may be bent during the coupling process
Solution Approach 1:
The locking wings are pre-formed on the electrode tab before assembly. During insertion, these pre-formed wings automatically engage with the terminal hole, providing immediate positioning and stabilization of the circuit board, thereby preventing bending during the coupling process.
Solution Approach 2:
The locking wings create a preliminary mechanical constraint that opposes any displacement or bending forces applied during coupling. This pre-established counter-action prevents the circuit board from bending while the electrical connection is being established.
3Reliability
If the electrode tab is soldered to the PCM, then electrical connection is secured, but the electrode tab may be soldered at a deviated position due to displacement
Solution Approach 1:
The electrode tab is segmented into a base plate and an insertion plate with locking wings. The insertion plate with locking wings ensures precise positioning in the terminal hole, while the base plate provides the soldering surface. This segmentation separates the positioning function from the connection function, ensuring accurate soldering position.
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 solution enhances the workability and maintains the PCM in the correct position relative to the bare cell, preventing displacement and ensuring reliable electrical connections.
Implementation Method 1
the locking wing is elastically bent during insertion into a terminal hole formed in the circuit board. Once through the terminal hole, the locking wing returns to its original shape, to lock the insertion plate in the terminal hole.
Data Source
AI summary
A secondary battery including: a cell unit including at least one battery cell; a protection circuit module including a circuit board having at least one terminal hole and at least one electrode tab. The electrode tab includes an insertion plate that is inserted into the terminal hole, to electrically connect the cell unit and the circuit board. The insertion plate includes a locking wing.