Coin Battery Module Support Structure for Thin PCB Shock Resistance
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Solution Overview
Problem
The existing battery module mounting techniques on multilayer circuit boards face issues with mechanical strength degradation, leading to potential damage of electrode plates and battery dropping, which compromises the energizing function and shock resistance.
Innovation Solution
A battery module design featuring a case body with a flat plate portion and a projecting base portion that inserts into a through-hole in the circuit board, securing the battery and distributing its weight to prevent direct contact and stress on the circuit board, thereby enhancing shock resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the circuit board thickness is reduced and area is saved to achieve height reduction and improve case accommodation properties, then the mechanical strength of the circuit board is degraded, but the battery module loses energizing function due to damage of electrode plates or dropping of the battery
Solution Approach 1:
The patent introduces a case body as an intermediary component between the battery and the circuit board. The case body includes a holding portion that secures the battery and a supporting portion that bears the battery's weight, preventing direct contact between the battery and the thinned circuit board. This mediator structure allows the circuit board to be reduced in thickness while maintaining sufficient mechanical strength to support the battery module assembly.
2Length of moving object
If the circuit board thickness is reduced to promote thickness reduction, then the electrode plates and circuit board cannot sufficiently support the weight of the battery, but shock resistance is compromised
Solution Approach 1:
The case body serves as a mediator that transfers and distributes the battery's weight and shock loads away from the thin circuit board. The supporting portion of the case body directly contacts the battery bottom surface and transmits forces to the mounting structure, protecting the circuit board from excessive stress and improving overall shock resistance despite the reduced board thickness.
Solution Approach 2:
The case body is segmented into distinct functional portions: a holding portion that secures the battery laterally and a supporting portion that bears the vertical load. This segmentation allows each portion to be optimized for its specific function, with the supporting portion designed to handle shock and weight loads while the holding portion provides lateral retention, collectively improving shock resistance.
Data Source
AI summary
A battery module according to the present invention includes: a case body including a flat plate portion and a base portion projecting from the flat plate portion; a circuit board including a through-hole formed in a thickness direction and secured to the case body, the base portion being inserted into the through-hole; and a battery secured to and placed on the base portion, in which the battery is a flat battery with a coin shape or a button shape, and electrode plates connected to each of the positive and negative poles of the battery are connected to the circuit board to supply a power source to electronic components disposed on the circuit board.