Battery Module Base Insulation Structure for Electrolyte Leakage

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Solution Overview

Problem

Conventional battery modules face the challenge of electrolyte solution leakage during charge and discharge cycles, which can lead to electrical short circuits, thermal runaway, and safety risks.

Innovation Solution

The battery module incorporates a base insulation member with a concave receiving portion to contain the electrolyte solution, along with a base plate and top plate with insulation members to prevent leakage and ensure electrical isolation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional battery modules are used without base insulation members, then the structure is simple, but electrolyte solution leaks out during charge and discharge, causing electrical short circuits and thermal runaway

Engineering Contradiction:

Improveprevention of electrolyte solution leakageVSAvoidstructure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The base insulation member acts as an intermediary component between the base plate and the battery cells. It provides electrical isolation and contains electrolyte solution leakage through its receiving portion, preventing direct contact between leaking electrolyte and the base plate, thus avoiding electrical short circuits while maintaining a relatively simple overall structure

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The base insulation member is divided into functional segments: a receiving portion for containing electrolyte solution and a base plate portion for providing electrical isolation. This segmentation allows each part to perform its specific function efficiently while keeping the overall design simple and modular

Inventive Principle:

Principle #1Segmentation

2Use of energy by moving object

If battery modules operate during charge and discharge cycles, then energy storage and delivery is achieved, but volume expansion and contraction cause electrolyte solution to leak out

Engineering Contradiction:

Improveenergy storage and deliveryVSAvoidelectrolyte solution leakage

Core Design Contradiction:

Use of energy by moving objectVSObject-generated harmful factors

Solution Approach 1:

The base insulation member's receiving portion is designed beforehand to accommodate and contain electrolyte solution that may leak during charge and discharge cycles. This pre-prepared containment structure prevents the leaking electrolyte from causing harmful effects such as electrical short circuits and thermal runaway

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The base insulation member serves as a mediator that intercepts electrolyte solution leakage generated during battery operation. By providing a receiving portion, it captures the leaking electrolyte before it can reach the base plate and cause electrical short circuits, thus mitigating the harmful effects of volume expansion and contraction

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS12288896B2Battery module having base insulating member

Publication Date: 2025.04.29 LG ENERGY SOLUTION LTD

AI summary

A battery module prevents an electrolyte solution from leaking out in the event of electrolyte solution leakage. To achieve the object, the battery module according to the present disclosure includes at least one cell assembly including a plurality of secondary batteries stacked in a direction, each secondary battery including an electrode lead, a base plate disposed below the cell assembly and extending in a horizontal direction to support a bottom of the cell assembly, and at least one base insulation member interposed between the cell assembly and the base plate and having a receiving portion formed concavely in a downward direction to receive a part of the cell assembly.