Prismatic Battery Collector Design for Space and Reliability

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Solution Overview

Problem

Current prismatic secondary batteries face challenges in achieving higher energy density and capacity while maintaining reliable assembly and current collection structures, particularly in electric vehicles and hybrid electric vehicles, due to space constraints and structural limitations.

Innovation Solution

A prismatic secondary battery design featuring a stacked electrode body with positive and negative electrode tab portions, a collector system including a deformation plate that cuts off the conductive path when pressure is applied, and a resin member to reduce space occupation and enhance structural reliability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a wound electrode body with exposed portions at both ends is used, then current collection is improved, but space occupation increases and energy density decreases

Engineering Contradiction:

Improvecurrent collection reliabilityVSAvoidspace occupation in battery case

Core Design Contradiction:

ReliabilityVSVolume of moving object

Solution Approach 1:

Instead of extending electrode exposed portions to both ends of the battery case, the invention inverts the arrangement by concentrating both positive and negative electrode exposed portions at one end portion of the battery case, thereby reducing space occupation while maintaining current collection functionality

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The invention merges the arrangement of positive and negative electrodes by positioning both electrode bodies with their exposed portions at the same end portion of the battery case, allowing more efficient space utilization and higher energy density

Inventive Principle:

Principle #5Merging (Combining)

2Volume of moving object

If electrode exposed portions are concentrated at one end, then energy density increases, but current collection reliability and assembly ease may deteriorate

Engineering Contradiction:

Improveenergy densityVSAvoidcurrent collection reliability

Core Design Contradiction:

Volume of moving objectVSReliability

Solution Approach 1:

The invention segments the battery case into distinct functional zones: one end portion for electrode connections and current collection, and the other end portion for terminal installations, allowing optimized current collection at the concentrated electrode end while maintaining reliable terminal access at the opposite end

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention introduces a current collector as an intermediary component that efficiently transfers current from the concentrated electrode exposed portions to the terminals at the opposite end, ensuring reliable current collection despite the concentrated arrangement

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of manufacture

If collector and tab portion connection is simplified, then assembly ease improves, but connection reliability under impact or vibration may worsen

Engineering Contradiction:

Improveassembly easeVSAvoidconnection reliability under impact

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The invention provides beforehand cushioning by positioning the resin member and deformation plate to absorb and mitigate the effects of impacts or vibrations before they can damage the collector-tab portion connection, thereby maintaining connection reliability while preserving assembly simplicity

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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

The design achieves higher energy density and capacity while ensuring reliable assembly and current collection, suppressing damage from impacts or vibrations, and facilitating easier connection of components.

Implementation Method 1

a deformation plate provided in a conductive path between the positive electrode plate or the negative electrode plate and the terminal, the deformation plate being deformed when a pressure inside the battery becomes equivalent to or above a predetermined value

Methodology Applied

Scientific EffectPressure-sensitive deformation: Deformation

Data Source

PatentUS9882236B2Prismatic secondary battery

Publication Date: 2018.01.30 SANYO ELECTRIC CO LTD

AI summary

A prismatic secondary battery in which a deformation plate becoming deformed when a pressure inside the battery becomes equivalent to or higher than a predetermined value is disposed in a conductive path between a positive electrode plate and a positive electrode terminal, a positive electrode collector connected to the positive electrode plate includes a collector body portion, a collector connection, and a lead portion, the end portion of the lead portion on one end portion side of the sealing plate in the longitudinal direction is positioned on the one end portion side of the sealing plate in the longitudinal direction with respect to an end portion of the collector body portion on the one end portion side of the sealing plate in the longitudinal direction, the collector body portion is connected to the deformation plate, and the lead portion is connected to a positive lead portion.