Bent Leadframe Battery Package for Compact, Expansion-Tolerant Assembly
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Solution Overview
Problem
Conventional electronic packages with molded battery holders face issues such as high battery temperatures, potential damage from battery expansion, increased package size and cost, and limitations in component packaging density.
Innovation Solution
An electronic package design utilizing a bent leadframe with flanged ends that encircles the battery and is physically and electrically connected to a substrate, providing structural support and an efficient electrical connection between the battery and electronic components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If molded battery holders are used to secure batteries, then the battery is held in place, but the package size increases and cost increases
Solution Approach 1:
The patent combines the battery holder function with the existing leadframe structure. The leadframe serves dual purposes: as the package substrate and as the battery holder, eliminating the need for separate molded battery holder components and reducing overall package size.
Solution Approach 2:
The leadframe is designed to perform multiple functions simultaneously: providing the package substrate, serving as the battery holder, and providing electrical connections. This multi-functionality reduces the number of separate components needed and decreases package size.
2Reliability
If molded battery holders are used to secure batteries, then the battery is held in place, but the package cost increases
Solution Approach 1:
The patent merges the battery holder function into the existing leadframe structure, eliminating the need for separate molded battery holder components. This reduces part count, assembly steps, and manufacturing cost.
Solution Approach 2:
The leadframe, which is already present in the package structure, is utilized for the battery holder function rather than introducing expensive specialized molded components. This leverages an existing inexpensive structure for multiple purposes.
3Reliability
If conventional battery packaging is used, then the battery is secured, but battery temperature issues occur
Solution Approach 1:
The patent extracts the battery from the traditional molded holder environment and places it directly on the leadframe structure. This removes the battery from harmful thermal conditions associated with molded materials while maintaining secure positioning through the leadframe's mechanical structure.
Solution Approach 2:
The leadframe acts as an intermediary between the battery and the package substrate, providing both mechanical support and thermal management. The metallic leadframe conducts heat away from the battery more effectively than molded materials.
4Reliability
If conventional battery packaging is used, then the battery is secured, but damage from battery expansion occurs
Solution Approach 1:
The leadframe structure provides a flexible yet supportive enclosure for the battery. The metallic structure can accommodate battery expansion while maintaining structural integrity, unlike rigid molded holders that may crack or fail under expansion stress.
Solution Approach 2:
The leadframe structure is designed with inherent flexibility and structural characteristics that anticipate and accommodate battery expansion before damage occurs. The structure provides a cushioning effect that prevents expansion-related failures.
5Reliability
If conventional battery packaging is used, then the battery is secured, but component packaging density is limited
Solution Approach 1:
The patent combines multiple functions (package substrate, battery holder, electrical connection) into the single leadframe structure, freeing up space and reducing complexity. This allows for higher component packaging density as fewer separate components are needed.
Solution Approach 2:
The leadframe serves multiple functions simultaneously, reducing the number of separate components required in the package. This multi-functionality increases packaging density by eliminating redundant structural elements.
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 design mitigates battery temperature issues, prevents damage from expansion, reduces package size and cost, and enhances component packaging density, while maintaining efficient electrical connections.
Implementation Method 1
a bent leadframe having flanged ends that are physically and electrically connected to a substrate so that the battery is encircled by the bent leadframe and the substrate
Implementation Method 2
the bent leadframe further being physically and electrically connected to a second terminal of the battery to provide an electrical connection between the battery and the electronic component
Implementation Method 3
the first terminal of the battery is welded to the bent leadframe or attached to the bent leadframe using an electrically conductive adhesive or solder
Data Source
AI summary
An electronic package with a battery and method for producing the electronic package uses a bent leadframe having flanged ends that are physically and electrically connected to a substrate so that the battery is encircled by the bent leadframe and the substrate, and the substrate is positioned between the battery and an electronic component. A first terminal of the battery is physically and electrically connected to the substrate and a second terminal of the battery is physically and electrically connected to the bent leadframe, which provides an electrical connection between the battery and the electronic component.