Flat Battery Unit Side-Surface Terminal Connection
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Solution Overview
Problem
Conventional battery units with flat batteries and substrates face challenges in minimizing size due to the increased size caused by the connection arrangement between the flat battery and the protection circuit, leading to a larger overall battery pack size.
Innovation Solution
A battery unit design featuring a flat battery with a tubular exterior can and a sealing can, where the substrate with circuit components is mounted on the flat surfaces, and the battery side terminal is electrically connected to the substrate side terminal at the side surface, allowing for a compact connection without increasing the thickness and preventing short-circuiting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If terminals are penetrated through the substrate for electrical connection, then electrical connection between flat battery and substrate is achieved, but the thickness of the battery unit increases due to terminal projections and solder
Solution Approach 1:
The patent transitions the terminal connection from a through-substrate vertical arrangement to a side-surface horizontal arrangement. The substrate side terminal is formed at the side surface of the substrate rather than penetrating through it, changing the dimensional orientation of the electrical connection path and eliminating thickness increase from terminal projections.
Solution Approach 2:
The patent extracts the terminal connection function from the substrate thickness dimension and relocates it to the side surface dimension. By forming the substrate side terminal at the side surface, the harmful effect of terminal projections increasing thickness is separated and eliminated.
2Reliability
If terminals are penetrated through the substrate, then electrical connection is established, but short-circuiting occurs due to terminal projection parts
Solution Approach 1:
The patent converts the potential harm of exposed terminals into a benefit by forming the substrate side terminal at the side surface where it can be properly enclosed. The notch structure accommodates the terminal in a position that prevents short-circuiting while maintaining electrical connection functionality.
3Volume of stationary object
If the connection arrangement between flat battery and substrate is made compact, then the overall battery unit size is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent merges the terminal formation and substrate mounting processes into a more integrated structure. The substrate side terminal is formed directly on the substrate body, and the notch structure provides built-in positioning and enclosure functions, reducing the need for separate components and simplifying assembly.
Data Source
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AI summary
A battery unit having a flat battery and a substrate that includes a devised connection arrangement between the flat battery and the substrate, so that the battery unit is reduced in size is provided. The battery unit (1) includes a flat battery (2) having a positive electrode can (10) and a negative electrode can (20) and a circuit substrate (61) provided on one of an upper surface and a bottom surface of the flat battery (2). Circuit components (62) are mounted at the circuit substrate (61). A battery side negative electrode terminal (81) and a battery side positive electrode terminal (82) electrically connected to the flat battery (2) are provided on a surface of the flat battery (2) provided with the circuit substrate (61). Substrate side terminals (63) electrically connected to the battery side negative electrode terminal (81) and the battery side positive electrode terminal (82) are formed at a side surface of the circuit substrate (2).