Positive Electrode Grid Layout for Uniform Potential in Lead Batteries

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Solution Overview

Problem

Liquid lead storage batteries face challenges in maintaining even potential distribution and durability, especially under high extraction current conditions, due to issues with current grid designs that lead to uneven wear and increased resistance.

Innovation Solution

A liquid lead storage battery design featuring a positive electrode current collector with a grid-like substrate where vertical intermediate bones obliquely expand from the lower frame bone to the upper frame bone, ensuring direct connection and reducing angles to less than 90 degrees, thereby improving current distribution and reducing corrosion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a simple grid shape with orthogonal intermediate bones is used, then the manufacturing is simple, but the potential distribution becomes uneven and resistance increases in portions far from the lug

Engineering Contradiction:

Improvegrid structure simplicityVSAvoidpotential distribution uniformity

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent applies asymmetry by making the vertical intermediate bones on the first frame bone side (opposite the lug) extend obliquely rather than orthogonally, with angles less than 90 degrees. This asymmetric configuration shortens the current path in the region farthest from the lug, improving potential distribution uniformity while maintaining manufacturing simplicity

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The patent applies local quality by differentiating the configuration of vertical intermediate bones based on their location. Specifically, bones on the first frame bone side (opposite the lug) extend obliquely with angles less than 90 degrees, while other bones maintain orthogonal or different configurations. This localized modification targets the specific region with highest resistance without changing the entire grid structure

Inventive Principle:

Principle #3Local quality

2Device complexity

If vertical intermediate bones extend orthogonally from the frame bone, then the structure is simple and manufacturing is easy, but corrosion progresses rapidly and durability decreases under high extraction current

Engineering Contradiction:

Improvebone extension structureVSAvoidbattery durability

Core Design Contradiction:

Device complexityVSDuration of action of stationary object

Solution Approach 1:

The patent changes the symmetric orthogonal extension of vertical intermediate bones to an asymmetric oblique extension on the first frame bone side. This asymmetric configuration reduces current concentration and corrosion in the vulnerable region opposite the lug, extending battery durability under high extraction current conditions while maintaining structural simplicity

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The patent applies parameter changes by modifying the extension angle of vertical intermediate bones from 90 degrees (orthogonal) to less than 90 degrees (oblique) on the first frame bone side. This parameter modification optimizes current distribution and reduces corrosion rates, improving durability without significantly increasing structural complexity

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This design enhances the potential distribution and stability of the positive electrode grid, maintaining performance even under high extraction currents, reducing corrosion, and extending the battery's life by minimizing uneven wear and resistance.

Implementation Method 1

The positive electrode current collector includes a grid-like substrate and a terminal. The grid-like substrate includes a frame bone forming four sides of a rectangular shape, and a plurality of intermediate bones connected to the frame bone and present inward of the frame bone.

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Implementation Method 2

at least part of a plurality of the vertical intermediate bones present in a range between a center between the pair of vertical frame bones and the first vertical frame bone are the first vertical intermediate bones extending from the lower frame bone side toward the upper frame bone side while obliquely expanding from each other, and directly reaching the upper frame bone. Angles formed by the first vertical intermediate bones and the upper frame bone on the first vertical frame bone side are less than 90°.

Methodology Applied

Scientific EffectElectrical resistance reduction through geometric optimization: Electrical Resistance

Data Source

PatentUS20230275237A1Liquid Lead Storage Battery

Publication Date: 2023.08.31 THE FURUKAWA BATTERY CO LTD

AI summary

A liquid lead storage battery includes a grid-like substrate of a positive electrode current collector that includes a frame bone forming four sides of a rectangular shape. Intermediate bones are connected to and present inward of the frame bone. At least some vertical intermediate bones present in a range between the center between a pair of vertical frame bones and the first vertical frame bone, which is the vertical frame bone on the side where a lug is absent, are first vertical intermediate bones extending from the lower to the upper frame bone sides while obliquely expanding from each other, and directly reach an upper frame bone. Angles formed by the first vertical intermediate bones and the upper frame bone on the first vertical frame bone side are less than 90°. Connection points of the first vertical intermediate bones to the upper frame bone are present only in this range.