Battery Protection IC Terminal Arrangement for Thermal Conductivity
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Solution Overview
Problem
Conventional battery protection ICs mounted on circuit boards with a flat rectangular shape suffer from reduced thermal conductivity and wettability of solder due to wiring patterns extending below the IC, affecting the connection between external terminals and the circuit board.
Innovation Solution
A battery protection integrated circuit with a package that covers a switch unit and control unit, featuring external connection terminals arranged on a terminal providing surface shorter than the circuit board, allowing for improved wiring patterns that prevent solder wettability issues by avoiding the need for wiring to extend below the IC, thus maintaining thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wiring patterns are extended below the IC to connect external terminals, then electrical connection is achieved, but thermal conductivity is lowered and solder wettability deteriorates
Solution Approach 1:
The patent changes the spatial arrangement of external terminals from a longitudinal arrangement (requiring wiring to extend below the IC) to a transverse arrangement across the short sides of the package. This dimensional change in terminal positioning allows wiring to remain on the surface plane without extending below the IC, thereby maintaining thermal conductivity and solder wettability while achieving electrical connection.
2Reliability
If wiring patterns are extended below the IC to connect external terminals, then electrical connection is achieved, but solder wettability is lowered
Solution Approach 1:
The patent repositions external terminals to be arranged across the short sides of the package rather than along the longitudinal direction. This dimensional repositioning enables wiring patterns to connect terminals without extending below the IC, ensuring proper solder wettability and ease of manufacturing while maintaining reliable electrical connection.
3Ease of operation
If external terminals are arranged along the longitudinal direction of the circuit board, then connection to battery terminals is simplified, but wiring patterns must extend below the IC reducing thermal conductivity
Solution Approach 1:
The patent transitions the terminal arrangement from the longitudinal direction (parallel to the circuit board's length) to the transverse direction (across the short sides perpendicular to the circuit board's length). This dimensional transition simplifies connection while avoiding the need for wiring to extend below the IC, thereby preserving thermal conductivity.
Data Source
AI summary
A battery protection integrated circuit includes a switch unit; a control unit that controls on and off of the switch unit based on a monitored result; a package; a plurality of external connection terminals that are electrically connected to a plurality of terminal portions of the switch unit and the control unit, respectively, all of the external connection terminals that are to be connected to a first terminal of a circuit board being provided at a first short side of the terminal providing surface that faces one of board short sides of a circuit board, and all of the external connection terminals that are to be connected to a second terminal of the circuit board being provided at a second short side that is opposite to the first short side, when being mounted on the circuit board.