Prismatic Battery Upper Case Terminal Layout for Lead Space Savings
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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 leads and reducing the risk of disconnection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If electrode leads are drawn out on the top surface and welded to the cap plate, then the battery can be assembled, but the capacity is reduced due to space occupation by the lead parts
Solution Approach 1:
The patent transitions the terminal connection from a top-surface arrangement to a side-surface arrangement. The terminal part is formed to extend along the side surface of the case, allowing electrode leads to connect at the side rather than the top, thereby utilizing previously unused side space and increasing internal volume for active materials.
Solution Approach 2:
The terminal connection structure is segmented into multiple connection points along the side surface. Instead of a single top-surface connection point, the terminal part extends along the side surface with multiple contact regions, distributing the connection and optimizing space utilization.
2Reliability
If electrode leads are drawn out on the top surface, then the battery can be assembled, but there is a risk of disconnection at the connecting parts
Solution Approach 1:
The patent merges the terminal connection function directly into the case structure. The terminal part is formed as an integral part of the case, eliminating separate top-surface connection components and reducing the number of discrete parts that could potentially disconnect.
Solution Approach 2:
The patent extracts the terminal connection from the top surface location and relocates it to the side surface. This extraction removes the vulnerable top-surface connection arrangement and replaces it with a more robust side-surface integration that reduces disconnection risks.
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.