Capacitor Case Rib and Fixing Bus Bar for Low-Height Strength

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Solution Overview

Problem

There is a challenge in reducing the height of capacitors while maintaining their strength, as height reduction often leads to a decrease in capacitor strength, necessitating a structure that can easily secure strength.

Innovation Solution

The capacitor design includes a rib extended from the capacitor case for internal reinforcement and a fixing bus bar with a direct fixing portion that is directly fixed to the rib, allowing the capacitor case to be securely attached to another member, thereby enhancing overall strength.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Length of moving object

If the height of the capacitor is reduced, then the capacitor size is minimized, but the strength of the capacitor decreases

Engineering Contradiction:

Improveheight of capacitorVSAvoidstrength of capacitor

Core Design Contradiction:

Length of moving objectVSStrength

Solution Approach 1:

The patent introduces a rib structure that protrudes from the inner surface of the capacitor case to provide internal reinforcement. This adds a dimensional feature (the rib protrusion) to the case structure, allowing strength enhancement without increasing the external height of the capacitor. The rib creates an internal structural dimension that compensates for the reduced overall height.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The bus bar is segmented into a fixing portion and a connection portion, with the fixing portion directly connected to the rib structure. This segmentation allows the bus bar to serve dual functions: electrical connection and structural reinforcement. The direct connection to the rib creates a load-bearing path that enhances capacitor strength without requiring additional height.

Inventive Principle:

Principle #1Segmentation

2Length of moving object

If the height of the capacitor is reduced, then the capacitor size is minimized, but the stiffness of the capacitor decreases

Engineering Contradiction:

Improveheight of capacitorVSAvoidstiffness of capacitor

Core Design Contradiction:

Length of moving objectVSStability of the object's composition

Solution Approach 1:

The rib structure protruding from the inner surface adds structural rigidity by creating a three-dimensional reinforcement feature. This internal dimensionality increase improves the moment of inertia of the case structure, enhancing stiffness without increasing external height.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The combination of the capacitor case material and the rib structure creates a composite structural system. The rib acts as an internal reinforcement element that works composite-style with the case material to improve overall stiffness and structural stability within the constrained height.

Inventive Principle:

Principle #40Composite materials

Data Source

PatentUS12087508B2Capacitor with fixing bus bar and capacitor case including rib for securing strength of the capacitor

Publication Date: 2024.09.10 DENSO CORP

AI summary

A capacitor includes: a capacitor element; a pair of bus bars; a capacitor case; and a sealing member. The capacitor element includes a pair of electrode surfaces. Each of the pair of bus bars is connected to a corresponding one of the pair of electrode surfaces. The capacitor element and the pair of bus bars are arranged in the capacitor case. The sealing member is charged in the capacitor case. The sealing member seals the capacitor element. The capacitor case includes a rib extended from a part of the capacitor case to an inside of the capacitor case. One of the pair of bus bars serves as a fixing bus bar, the fixing bus bar includes a direct fixing portion to be directly fixed to the rib.