Battery Module Lead-Bending Layout to Prevent Cell Interference

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Solution Overview

Problem

Conventional battery modules face damage due to interference between neighboring battery cells connected to a common bus bar, leading to anode connection phenomena that weaken sealing and insulating performances, requiring additional insulating materials to prevent.

Innovation Solution

A battery module structure where electrode leads of neighboring cells are bent in opposite directions, forming bent portions on the terrace and lead film regions, preventing contact and oxidation, thus eliminating the need for additional insulating components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If electrode leads of neighboring battery cells are connected to a common bus bar through a lead drawing hole, then electrical connection efficiency is improved, but interference between battery cells causes anode connection that weakens sealing and insulating performances

Engineering Contradiction:

Improveelectrical connection efficiencyVSAvoidsealing and insulating performances

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent divides the battery cell arrangement by introducing partition walls that segment the space around lead drawing holes. This segmentation prevents interference between neighboring battery cells while maintaining their electrical connection to common bus bars, thus resolving the contradiction between connection efficiency and sealing performance

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces partition walls as intermediary structures between neighboring battery cells. These partition walls act as mediators that prevent direct contact and interference between electrode leads and pouch case boundary portions, thereby maintaining insulating performance without compromising electrical connection efficiency

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If insulating tape is attached to electrode leads and pouch case boundary portions to prevent anode connection, then sealing and insulating performances are improved, but additional components and attaching processes reduce productivity

Engineering Contradiction:

Improvesealing and insulating performancesVSAvoidmanufacturing productivity

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent extracts and eliminates the need for additional insulating components (insulating tape) by redesigning the battery module structure. The partition wall structure inherently provides insulation, removing the requirement for separate insulating materials and their attaching processes, thus improving productivity while maintaining reliability

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent enables the battery module structure to provide its own insulation function through the partition walls. The structural design itself serves the insulating function, eliminating the need for external insulating components and simplifying the manufacturing process

Inventive Principle:

Principle #25Self-service

3Volume of moving object

If battery cells are arranged closely to increase module capacity, then space utilization is improved, but interference between neighboring cells increases the risk of anode connection

Engineering Contradiction:

Improvemodule capacity densityVSAvoidinterference between battery cells

Core Design Contradiction:

Volume of moving objectVSObject-affected harmful factors

Solution Approach 1:

The patent uses partition walls to segment the battery module into distinct regions, allowing battery cells to be arranged closely for high capacity density while preventing harmful interference. The segmentation creates physical barriers that eliminate anode connection risks even when cells are in close proximity

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS12261325B2Battery module having structure capable of preventing battery cell damage, and battery pack and vehicle comprising battery module

Publication Date: 2025.03.25 LG ENERGY SOLUTION LTD

AI summary

A battery module including a cell stack structure in which a plurality of battery cells including a first battery cell and a second battery cell neighboring each other are stacked. A bus bar frame assembly includes a plurality of lead drawing holes from which electrode leads included in the plurality of battery cells are drawn out. An electrode lead of a first polarity included in the first battery cell and an electrode lead of the first polarity included in the second battery cell are externally drawn out through a same lead drawing hole. The electrode lead of the first battery cell and the electrode lead of the second battery cell are bent in a same direction at a same location and each includes a first bent portion formed on a terrace portion and a second bent portion formed in a region where a lead film is formed.