Secondary Battery PCB Terminal with Projection Jaws
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Solution Overview
Problem
Existing secondary batteries with pack configurations face challenges in stable charge/discharge operations and secure connections to external devices due to the lack of a reliable and robust terminal system.
Innovation Solution
A secondary battery design incorporating a printed circuit board (PCB) terminal on a protective circuit module (PCM) with a symmetrical pad configuration and projection jaws to prevent movement, ensuring stable electrical connection and secure attachment to external devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a simple external terminal is used on the PCM, then the device complexity is reduced, but the reliability of electrical connection to external devices deteriorates
Solution Approach 1:
The terminal system is segmented into multiple functional components: external terminal on PCM, PCB terminal with contact pad and external pad, and projection jaws. This segmentation allows each component to perform its specific function optimally, ensuring reliable electrical connection while maintaining manageable complexity through modular design.
Solution Approach 2:
The PCB terminal is nested on the external terminal, creating a hierarchical structure where the contact pad connects to the external terminal and the external pad provides the external interface. This nesting ensures multiple connection points for enhanced reliability without significantly increasing overall device complexity.
2Stability of the object's composition
If the PCB terminal is securely fixed to the PCM, then the stability of the battery pack is improved, but the ease of manufacture deteriorates due to additional positioning requirements
Solution Approach 1:
Projection jaws are provided on the PCB terminal before assembly to preemptively guide and constrain the terminal's position on the PCM. This preliminary positioning feature ensures stable placement during assembly without requiring complex positioning mechanisms, thereby maintaining ease of manufacture while achieving position stability.
3Reliability
If a robust terminal system with multiple pads and via holes is implemented, then the reliability of charge/discharge operations is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The PCB terminal serves multiple functions: electrical connection through contact pad and external pad, mechanical support through PCB body, and positioning through projection jaws. This multi-functionality consolidates several requirements into a single component, reducing the need for high precision alignment between multiple separate parts while maintaining operational reliability.
Data Source
AI summary
A secondary battery, including a bare cell, a protective circuit module (PCM) disposed on a top surface of the bare cell, the PCM comprising an external terminal a top surface thereof, and a printed circuit board (PCB) terminal disposed on the external terminal, the PCB terminal being electrically connected to the external terminal and an external device.