Battery Cell Terminal Design for Height Reduction
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Solution Overview
Problem
Conventional lithium secondary battery cells have a long overall height due to the exposure of terminals, which occupies unnecessary space within the case.
Innovation Solution
The battery cell design includes an electrode assembly with first and second terminals extending in specific directions, connected to lead taps that are sealed externally by a coating of a sealing member, reducing the overall height by exposing only the lead taps outside the case.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If terminals are exposed to the outside of the case, then electrical connection is achieved, but the overall height of the battery cell increases
Solution Approach 1:
The patent introduces lead taps as intermediary components that extend through the case wall. These lead taps provide the electrical connection function while allowing the terminals to remain inside the case, thus mediating between the need for external electrical access and the desire to minimize case height
Solution Approach 2:
Instead of extending terminals vertically outward from the case (height direction), the patent routes connections through the case wall in a horizontal dimension. This dimensional change allows electrical access without increasing the overall height of the battery cell
2Ease of operation
If terminals extend outside the case, then power supply connection is enabled, but unnecessary space inside the case is occupied
Solution Approach 1:
The patent extracts the terminal components from the internal case space and positions them inside the case, while only the essential lead tap portions extend through the case wall for external connection. This extraction eliminates the space occupation problem while maintaining electrical connectivity
Solution Approach 2:
Lead taps serve as intermediary elements that provide the necessary external connection interface without requiring terminals to occupy valuable internal case space. The lead taps bridge the internal terminal structure with external power supply connections
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 configuration effectively reduces the overall length in the height direction of the battery cell, optimizing space usage within the case.
Implementation Method 1
a sealing part sealed by coating a sealing member on circumferential sides joined with each other is formed
Data Source
AI summary
Provided is a battery cell including: an electrode assembly including a first electrode part, a second electrode part, and a separation membrane; a first terminal and a second terminal extending in a first direction or a fourth direction which is an opposite direction to the first direction from the first electrode part and the second electrode part, respectively; a first lead tap and a second lead tap connected to the first terminal and the second terminal, respectively; and a case in which the electrode assembly, the first terminal, and the second terminal are accommodated, which is sealed to expose the first lead tap and the second lead tap to the outside, and in which a sealing part sealed by coating a sealing member on circumferential sides joined with each other is formed.