Prismatic Battery Upper Case Terminals for Side Lead Connection
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Solution Overview
Problem
Conventional prismatic secondary batteries face issues of reduced capacity due to space occupation by electrode lead parts and a risk of disconnection at the connecting parts.
Innovation Solution
The prismatic secondary battery features a configuration where electrode lead parts are directly connected to terminal parts on both sides of the upper case, eliminating the need for external lead connections and incorporating a gas venting mechanism for safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrode lead parts are drawn out on the top surface and welded to the cap plate, then electrical connection is achieved, but battery capacity is reduced due to space occupation
Solution Approach 1:
The patent transitions the electrode lead connection from a top-surface arrangement (2D plane) to a side-direction arrangement (utilizing the third dimension). The electrode leads are extended in the side direction and connected to terminal parts formed on the side surfaces of the upper case, thereby utilizing previously unused side space and increasing the volume available for active materials.
2Reliability
If terminal parts are formed on the top surface, then electrical connection is achieved, but manufacturing complexity increases
Solution Approach 1:
The upper case is designed to serve multiple functions: it provides structural containment and simultaneously forms the terminal parts on its side surfaces. This integration means the upper case acts as both the battery container and the terminal structure, eliminating the need for separate terminal components and simplifying the manufacturing process.
Data Source
AI summary
Disclosed herein relates to a prismatic secondary battery including: an electrode assembly including a first electrode lead part formed in a first side direction and a second electrode lead part formed in a second side direction opposite the first side direction; a lower case having an open upper surface and housing the electrode assembly therein; and an upper case covering the open upper surface of the lower case, wherein the upper case includes: a first terminal part bent from a top surface of the upper case corresponding to the open upper surface of the lower case and extending downwardly in the first side direction; and a second terminal part bent from the top surface of the upper case and extending downwardly in the second side direction, wherein the first electrode lead part is electrically connected to the first terminal part, and the second electrode lead part is electrically connected to the second terminal part.