Pouch Cell Cartridge Binding Structure for Lateral Movement Restraint

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Solution Overview

Problem

Conventional battery modules are vulnerable to movement of battery cells in directions perpendicular to the stacking direction, leading to potential damage and safety issues due to minute spaces between cells and the module case.

Innovation Solution

A binding structure is implemented within the cell cartridges, where first and second pouch cells have extending fixing portions that are bent towards each other to restrict movement, ensuring the cells are securely fixed and preventing relative movement between them.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If end plates are used to press both surfaces of the battery cell stack, then movement of battery cells along the stacking direction is prevented, but movement of battery cells in directions perpendicular to the stacking direction cannot be prevented

Engineering Contradiction:

Improvestability of battery cell stackVSAvoidsafety and reliability of battery module

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The invention transitions from one-dimensional restraint (end plates pressing along stacking direction) to three-dimensional restraint by introducing side plates that extend along the stacking direction and binding structures that connect opposite side plates, thereby preventing cell movement in perpendicular directions as well

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The battery module is divided into segmented compartments by introducing side plates between individual battery cells, creating multiple restraint zones that independently secure each cell against movement in perpendicular directions

Inventive Principle:

Principle #1Segmentation

2Ease of manufacture

If minute space is present between battery cell and module case, then ease of assembly is improved, but battery cell movement and potential damage occur

Engineering Contradiction:

Improveease of assemblyVSAvoidcell movement and damage

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

Binding structures serve as intermediary elements that connect opposite side plates, creating an additional restraint mechanism that prevents cell movement without requiring tight clearance between cells and module case

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

Side plates and binding structures are pre-installed to establish restraint boundaries before battery cells are inserted, ensuring cells are secured against movement in perpendicular directions from the outset

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentEP3514853B1Cell cartridge and battery module comprising same

Publication Date: 2025.01.01 LG ENERGY SOLUTION LTD

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AI summary

Disclosed is a cell cartridge, which includes a first pouch cell having a first fixing portion extending out of a sealing portion thereof; a second pouch cell having a second fixing portion extending out of a sealing portion thereof; and a cartridge configured to accommodate a cell stack formed by stacking the first pouch cell and the second pouch cell, wherein the first fixing portion is bent toward the second pouch cell to restrict movement of the second pouch cell, and wherein the second fixing portion is bent toward the first pouch cell to restrict movement of the first pouch cell.