Pouch Cell Block Venting Structure for Stable Battery Pack Assembly

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Solution Overview

Problem

Conventional battery packs face challenges with energy density, assemblability, and stability due to modularization of pouch-type batteries, which are vulnerable to external impact and difficult to fix stably, with issues in ensuring stable venting during thermal events.

Innovation Solution

A battery cell block comprising a plurality of pouch-type battery cells surrounded by a cell cover with a fixing member that secures the stack and includes a venting hole, which is closed by the fixing member to prevent foreign material ingress and opens during thermal events to discharge gas effectively.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If pouch-type battery cells are stacked directly in a pack case (CTP-type), then energy density and cooling efficiency are improved, but the cells become vulnerable to external impact and difficult to fix stably

Engineering Contradiction:

Improveenergy densityVSAvoidstability during venting

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The battery pack is divided into multiple cell blocks, each containing a specific number of battery cells (e.g., 4 cells per block). This segmentation allows for stable modular assembly while maintaining high energy density, as each block can be independently fixed and managed for thermal events.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A cell cover is introduced as an intermediary component between the battery cells and the pack case. The cell cover surrounds and protects the battery cells, providing stable fixation and controlled venting pathways, thus resolving the vulnerability of direct CTP assembly.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If a cell cover surrounds battery cells with a venting hole, then controlled venting is achieved, but the venting hole may allow foreign material ingress when closed

Engineering Contradiction:

Improvestable ventingVSAvoidforeign material penetration

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The venting hole is preliminarily closed by a closing member (such as a cap or plug) before thermal events occur. This preliminary closing prevents foreign material ingress during normal operation, while the closing member can be quickly removed or opened when venting is needed during thermal runaway.

Inventive Principle:

Principle #10Preliminary action

3Productivity

If multiple cell units are stacked to form a block, then assembly efficiency is improved, but the stacked cells become difficult to fix stably

Engineering Contradiction:

Improveassembly efficiencyVSAvoidfixation stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

Multiple battery cells are merged into a single cell block structure with a common cell cover and fixing mechanism. This merging maintains assembly efficiency by treating multiple cells as one unit while providing stable fixation through the unified cell cover that surrounds all cells in the block.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentEP4376191B1Battery cell block, and battery pack and vehicle including the same

Publication Date: 2026.03.04 LG ENERGY SOLUTION LTD

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AI summary

Provided are a battery cell block, and a battery pack and a vehicle including the same. A battery cell block according to an embodiment of the present disclosure includes a plurality of cell units including one or more pouch-type battery cells and a cell cover configured to surround the one or more pouch-type battery cells, the plurality of cell units being stacked in at least one direction, and a fixing member configured to fix a stacked state of the plurality of cell units by surrounding a stack of the plurality of cell units.