Battery External Terminal Sloping Face Short Circuit Prevention
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Solution Overview
Problem
Conventional batteries lack effective measures to prevent short circuits when an external terminal comes into contact with the battery main body due to impacts or loads applied during use or dropping.
Innovation Solution
A battery design featuring a metal terminal with a sloping tip end face and a notch on the external terminal, which directs falling forces laterally and concentrates stress at a predetermined point, preventing contact with the main body and thus avoiding short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the external terminal is made to protrude outward from the main body for easy connection, then the ease of operation is improved, but the reliability deteriorates because the terminal may fall and contact the main body causing short circuits
Solution Approach 1:
The external terminal is designed with an asymmetric sloping tip end face where one side is higher than the other. This asymmetric geometry creates a predetermined falling direction when the terminal is impacted, directing it away from the main body rather than allowing random falling that could cause short circuits.
Solution Approach 2:
The problem of terminal falling in three-dimensional space is solved by introducing a directional constraint through the sloping face geometry. The slope angle (10° to 70°) creates a preferred falling plane and direction, effectively reducing the random 3D falling behavior to a controlled 2D directional fall away from the main body.
2Ease of operation
If the external terminal is made longer for better electrical connection, then the ease of operation is improved, but the object-affected harmful factors worsen because the terminal is more susceptible to impacts and loads
Solution Approach 1:
The sloping tip end face creates asymmetric stress distribution when impact forces are applied to the terminal. This asymmetric geometry ensures that impact forces are directed along the slope away from the main body, reducing the harmful effects of impacts and loads on the terminal connection.
Data Source
AI summary
A battery includes: an external terminal protruding outward from a main body; a metal terminal for taking out electric power from inside the main body to the external terminal; and an insulating member for insulation between the main body, and the external terminal and the metal terminal. The metal terminal includes a base portion connected to the inside of the main body and extending along the same plane as one face of the main body from which the external terminal protrudes and an end portion which further extends from the base portion and to which the external terminal is fixed. The external terminal includes a tip end face formed as a sloping face which is low on the end portion side of the metal terminal and high on the base portion side of the metal terminal.