Pouch Cell Support Plate Ribs Against Jelly-Roll Deformation

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Solution Overview

Problem

Secondary batteries with jelly-roll type electrode assemblies are vulnerable to movement and deformation due to external impacts, such as falling, which can lead to short-circuits.

Innovation Solution

A secondary battery design that includes a pouch case with a support plate having a base plate and a rib inserted into the electrode assembly to prevent movement and deformation, featuring a base plate that covers the lower end surface and a rib extending upwardly to secure the assembly, potentially with auxiliary ribs for additional support.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a jelly-roll type electrode assembly is used in a pouch case, then the battery can be manufactured with simple structure and low cost, but the electrode assembly becomes vulnerable to movement and deformation due to external impact

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidresistance to movement and deformation

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The support plate is divided into a base plate and multiple ribs. The base plate covers the lower end surface while ribs extend upward to insert into the electrode assembly at different positions, creating segmented support points that collectively prevent movement and deformation without complicating the overall structure

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The support plate acts as an intermediary component between the pouch case and the electrode assembly. It mediates the mechanical stress from external impacts by distributing forces through the base plate and ribs, protecting the electrode assembly from direct impact while maintaining the simple pouch case structure

Inventive Principle:

Principle #24Intermediary (Mediator)

2Device complexity

If no support structure is added to the electrode assembly, then the battery structure remains simple and cost-effective, but the electrode assembly is susceptible to severe movement and edge deformation during falling

Engineering Contradiction:

Improvestructural complexityVSAvoidimpact damage susceptibility

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The support plate with ribs is pre-installed on the electrode assembly before packaging. The ribs are positioned to insert into the electrode assembly at critical locations, creating preliminary mechanical constraints that prevent movement and deformation before external impacts occur

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Rather than adding a complete enclosing structure, the support plate provides localized support at critical areas. The base plate covers the lower end surface while ribs are strategically positioned to insert into the electrode assembly, providing reinforcement only where needed to prevent impact damage

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS20230282941A1Secondary battery

Publication Date: 2023.09.07 SAMSUNG SDI CO LTD

AI summary

Disclosed is a secondary battery including a case, an electrode assembly that is wound and accommodated in the case, and a support plate including a plate-shaped base plate disposed at one end of the electrode assembly and supporting the one end of the electrode assembly, and at least one rib vertically protruding from the base plate to be inserted into a wound inner portion of the electrode assembly or to be in contact with an outer surface of the electrode assembly.