Battery Pack Lead Plate Waterproof Sealing

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional battery packs face contamination risks due to openings in lead plates, allowing water and foreign particles to enter, which can damage the battery cells.

Innovation Solution

The battery pack design incorporates ring-shaped projections on waterproof sheets that surround and make tight contact with lead plates, effectively sealing the openings and preventing water and foreign particle entry, with additional inner waterproof sheets enhancing the sealing performance between battery cells and lead plates.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If an opening is provided in the lead plate, then electrical connection is improved, but water and foreign particles can enter through the opening

Engineering Contradiction:

Improveelectrical connectionVSAvoidwater and foreign particle entry

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

A waterproof sheet is introduced as an intermediary component between the battery cell and the lead plate. This waterproof sheet includes a waterproof portion that covers the opening in the lead plate, allowing electrical connection to be maintained while preventing water and foreign particles from entering through the opening.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The waterproof sheet is implemented as a thin film structure that includes a waterproof portion covering the opening. This thin film approach allows the opening to remain open for electrical connection purposes while the flexible waterproof sheet conformally covers the opening to prevent contamination from water and foreign particles.

Inventive Principle:

Principle #30Flexible shells and thin films

2Object-affected harmful factors

If a waterproof sheet is added to cover the lead plate opening, then protection from water and foreign particles is improved, but device complexity increases

Engineering Contradiction:

Improveprotection from water and foreign particlesVSAvoidstructure complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The waterproof sheet is designed to perform multiple functions simultaneously: it provides waterproof protection over the opening, maintains electrical connection pathways, and structurally integrates with both the battery cell and lead plate. By combining these functions into a single component, the design avoids adding excessive complexity while achieving comprehensive protection.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The waterproof sheet serves multiple purposes: it acts as a barrier against water and foreign particles, maintains the electrical connection structure, and provides structural support between components. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS11128010B2Battery pack

Publication Date: 2021.09.21 MAKITA CORP

AI summary

A battery pack may include a battery cell; a first lead plate electrically connected to a first end of the battery cell; and a first outer waterproof sheet arranged along the first lead plate and covering the first lead plate from outside. The first lead plate may include an opening, and the first outer waterproof sheet may include a ring-shaped projection formed on an inner surface of the first outer waterproof sheet. The ring-shaped projection may project toward the first lead plate and surround the opening of the first lead plate.