Secondary Battery Terminal Structure for Busbar-Free Pack Assembly
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Solution Overview
Problem
The existing prismatic secondary batteries require labor-intensive design changes to alter the arrangement of positive and negative terminals, and the complex design of busbars for electrical connections adds to the challenges in manufacturing.
Innovation Solution
The introduction of W-type and T-type terminal structures that allow for easy rearrangement of terminal positions and direct electrical connections between secondary batteries without the need for separate busbars, facilitating series, parallel, or series-parallel circuit configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the terminal arrangement is fixed according to design specifications, then the battery structure is stable, but changing terminal positions requires labor-intensive redesign
Solution Approach 1:
The terminal structure is divided into a terminal body and an extension terminal. The extension terminal can be selectively extended in different directions (width direction or thickness direction) to achieve various terminal arrangements without redesigning the entire terminal structure, thus improving adaptability while maintaining manufacturing simplicity.
Solution Approach 2:
The extension terminal is designed to be dynamically extendable from the terminal body. By extending the extension terminal in different directions, the battery can adapt to different terminal arrangement requirements (width direction for W-type, thickness direction for T-type) without requiring separate fixed designs for each configuration.
2Reliability
If separate busbars are used for electrical connections, then the connection is reliable, but the device complexity and manufacturing cost increase
Solution Approach 1:
The extension terminal integrates both the terminal function and the busbar function into a single component. The extension terminal directly provides electrical connections to other batteries or external devices, eliminating the need for separate busbars and reducing device complexity while maintaining connection reliability.
Solution Approach 2:
The extension terminal serves multiple functions: it extends the terminal body to achieve different terminal arrangements, provides electrical connections between batteries, and replaces the function of separate busbars. This multi-functional design simplifies the overall system while ensuring reliable electrical connections.
3Ease of manufacture
If the terminal structure is simplified, then the manufacturing cost decreases, but the electrical connection capability is limited
Solution Approach 1:
The extension terminal's ability to extend in different directions provides dynamic adaptability. A single simplified terminal structure can achieve multiple terminal arrangements (W-type for width direction connections, T-type for thickness direction connections) and various electrical connection configurations, maintaining versatility without increasing manufacturing complexity.
Data Source
AI summary
Disclosed herein relates to a secondary battery, including: an electrode assembly; a battery case; a positive terminal and a negative terminal spaced apart on a top surface of the battery case; and at least one of a W-type terminal structure and a T-type terminal structure, wherein the W-type terminal structure is a structure capable of connecting two secondary batteries in a width direction, and the T-type terminal structure is a structure capable of connecting two secondary batteries in a thickness direction.