Electrolytic Capacitor Lead Member Width and Seat Plate Partition

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Solution Overview

Problem

Electrolytic capacitors face challenges in reducing equivalent series resistance (ESR), which limits their ability to handle ripple current and efficiently dissipate heat, leading to constraints on their performance and application.

Innovation Solution

The design includes a capacitor main body with a hollow column-shaped exterior member and lead members, where the lead members have a bar-shaped drawn part with a width of 0.1 times or more of the exterior member's diameter, and a seat plate with through holes and a partition wall, allowing the lead members to pass through and enhancing thermal management and mechanical stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the lead members have a small width, then the device complexity is reduced, but the equivalent series resistance (ESR) increases

Engineering Contradiction:

Improveequivalent series resistance (ESR)VSAvoidlead member dimensions

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies parameter changes by specifying that the width of the drawn part of the lead members should be 0.1 times or more of the diameter of the exterior member. This dimensional parameter optimization directly reduces the equivalent series resistance (ESR) of the electrolytic capacitor, improving its ability to handle ripple current and dissipate heat effectively.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If the lead members have a small width, then the manufacturing precision requirements are reduced, but the ripple current handling capability decreases

Engineering Contradiction:

Improveripple current handling capabilityVSAvoidlead member width

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent establishes a minimum width parameter for the lead members (0.1 times the exterior member diameter) to ensure sufficient ripple current handling capability. This parameter specification balances manufacturing feasibility with performance requirements, allowing the capacitor to effectively dissipate heat and handle ripple current.

Inventive Principle:

Principle #35Parameter changes

3Temperature

If the seat plate does not have a partition wall, then the device complexity is reduced, but the thermal management performance deteriorates

Engineering Contradiction:

Improveheat dissipation performanceVSAvoidseat plate structure

Core Design Contradiction:

TemperatureVSDevice complexity

Solution Approach 1:

The patent applies segmentation by introducing a partition wall in the seat plate that divides the internal space. This partition wall improves thermal management performance by facilitating better heat dissipation from the lead members while maintaining a relatively simple overall structure. The partition creates separate zones that enhance cooling efficiency.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS11664170B2Electrolytic capacitor and seat plate

Publication Date: 2023.05.30 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

An electrolytic capacitor includes a capacitor main body. The capacitor main body includes an exterior member and a pair of lead members. The exterior member includes a case and a closing part. The case has a hollow column shape. The case includes an opening part at an end in an axial direction of the hollow column shape. The closing part closes the opening part. The pair of lead members each include a drawn part exposed from the closing part. The drawn part has a bar shape. When viewed in the axial direction, a width of the drawn part is 0.1 times or more of a diameter of the exterior member.