Prismatic Battery End-Terminal Welding for Dense Cell Assembly
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Solution Overview
Problem
Current prismatic secondary batteries face challenges in achieving higher volume energy density and efficient, stable manufacturing processes.
Innovation Solution
The design includes an electrode assembly with a first electrode and a second electrode of opposite polarity, housed in an exterior package with a case main body and sealing plates, featuring a welding connection between the electrode terminal and current collector member, utilizing a resin member for insulation and airtightness, and employing energy ray welding for assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the positive electrode terminal is provided on a side surface and the negative electrode terminal is provided at an end portion, then the battery assembly can have a low height, but the volume energy density and manufacturing efficiency cannot be sufficiently improved
Solution Approach 1:
The patent transitions from a conventional terminal arrangement to a configuration where both positive and negative electrode terminals are provided on the same end surface of the battery case. This dimensional reorganization of terminal positions enables more efficient space utilization within the battery assembly, thereby improving volume energy density while maintaining compact dimensions
2Reliability
If the welding portion is provided inside the battery case, then the connection is secure, but the manufacturing process becomes complex and less stable
Solution Approach 1:
The patent extracts the welding operation from the internal battery assembly process and relocates it to the external terminal. By providing the welding portion on the outer surface of the battery case rather than inside, the welding process can be performed separately and more reliably, improving both connection security and manufacturing stability
3Reliability
If multiple components are assembled inside the battery case, then the battery can be sealed, but the manufacturing efficiency decreases
Solution Approach 1:
The patent implements preliminary assembly of the electrode group with current collectors and tabs outside the battery case before final sealing. By preparing the internal components and their connections in advance externally, the final sealing process becomes simpler and faster, thereby improving manufacturing efficiency while maintaining sealing reliability
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 enables the efficient manufacture of secondary batteries with improved volume energy density and enhanced reliability of connections, facilitating stable and high-capacity battery production.
Implementation Method 1
the first electrode terminal and the first electrode current collector member are connected to each other by a welding portion
Implementation Method 2
a first resin member is disposed between the first electrode terminal and the first sealing plate
Data Source
AI summary
In this secondary battery, a first resin member is disposed between a negative electrode terminal and a first sealing plate, the negative electrode terminal and a negative electrode current collector are connected to each other by a welding portion, the welding portion extends through the negative electrode terminal, and the welding portion is provided in the negative electrode terminal on an outer side with respect to the negative electrode current collector. With this configuration, the negative electrode terminal and a negative electrode tab group can be electrically joined to each other with an electrode assembly being disposed in a case main body. As a result, a secondary battery having a higher volume energy density can be manufactured efficiently.