Folding Pouch Battery Pack Structure for Short-Circuit Isolation

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Solution Overview

Problem

Pouch-type secondary battery packs face issues with short circuits due to adjacent electrode terminals having different potentials and difficulty in connecting sensing lines for voltage measurement.

Innovation Solution

A battery pack design featuring pouch-type battery cells with electrode terminals protruding in the same direction, connected by a connection plate that folds to form a stack structure, using housings to insulate and facilitate sensing line connection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If pouch-type battery cells are connected in series with alternating positive and negative terminals, then the cell stack structure is formed, but electrode terminals with different potentials contact each other causing short circuits

Engineering Contradiction:

Improveshort circuit preventionVSAvoidconnection structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The connection structure is segmented into separate connection plates for positive terminals and negative terminals, preventing direct contact between opposite polarity terminals. Each connection plate independently connects terminals of the same polarity, eliminating the short circuit risk while maintaining series connection functionality.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Connection plates serve as intermediary elements between battery cell terminals. These plates mediate the electrical connection by providing isolated connection points for positive and negative terminals, preventing direct contact between opposite polarity terminals and thus avoiding short circuits.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If the connection width between series-connected battery cells is narrow, then the cell stack structure is compact, but it becomes difficult to connect sensing lines for voltage measurement

Engineering Contradiction:

Improvesensing line connection easeVSAvoidconnection width

Core Design Contradiction:

Ease of operationVSLength of stationary object

Solution Approach 1:

The connection structure utilizes the width dimension of the connection plates to provide adequate space for sensing line connections. By expanding the connection interface in the width direction rather than increasing overall cell stack width, the patent enables easy sensing line attachment while maintaining compact stack dimensions.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The connection plates are pre-configured with designated connection regions and protruding structures that facilitate sensing line attachment. This preliminary arrangement of connection elements eliminates the need for complex post-assembly wiring operations, making sensing line connection straightforward.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12463291B2Pouch-type battery pack having folding structure and manufacturing method there-of

Publication Date: 2025.11.04 LG ENERGY SOLUTION LTD

AI summary

Discussed is a battery pack to which a folding structure is applied and a manufacturing method thereof, and more particularly, to a battery pack in which battery cells are connected in series using a connection plate in an unfolded state, then wrapped and fixed with individual housings, and a folding structure is applied to form a cell stack structure of the battery cells by folding the connection plate connecting the battery cells in that state and a manufacturing method thereof.