Connector Thermal Element for EV Charging Current Management

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Solution Overview

Problem

Charging systems for electric vehicles face challenges in managing high charging currents, leading to excessive heating of contact elements in connectors, which is limited by installation space, weight, and cost constraints, necessitating a solution to maintain high current-carrying capacity while preventing overheating.

Innovation Solution

Incorporating heat capacity elements with large thermal mass, thermally connected to contact elements, and electrically insulated from each other to absorb and dissipate heat, thereby delaying heating and preventing excessive temperatures without active cooling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If contact elements are dimensioned larger to increase current-carrying capacity, then higher charging currents can be transmitted, but installation space requirements, weight, and costs increase

Engineering Contradiction:
Improvecurrent-carrying capacityVSAvoidweight
Core Design Contradiction:
PowerVSWeight of stationary object

Solution Approach 1:

The patent changes the thermal parameters of the contact element by integrating a heat capacity element, allowing the same physical dimensions to handle higher currents without proportional increases in weight. The heat capacity element absorbs thermal energy, enabling the contact element to maintain lower operating temperatures despite high current loads.

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The heat capacity element acts as an intermediary between the contact element and the thermal environment. It absorbs excess heat generated during high-current charging operations, preventing direct thermal transfer to the contact element structure and enabling higher current capacity without increasing weight.

Inventive Principle:
Principle #24Intermediary (Mediator)

2Power

If contact elements are dimensioned larger to increase current-carrying capacity, then higher charging currents can be transmitted, but installation space requirements increase

Engineering Contradiction:
Improvecurrent-carrying capacityVSAvoidinstallation space
Core Design Contradiction:
PowerVSArea of stationary object

Solution Approach 1:

The patent modifies the thermal parameters of the contact element through integration with a heat capacity element, allowing the same physical footprint to support higher current ratings. The thermal management capability is enhanced without increasing the spatial dimensions of the connector.

Inventive Principle:
Principle #35Parameter changes

3Power

If contact elements are dimensioned larger to increase current-carrying capacity, then higher charging currents can be transmitted, but costs increase

Engineering Contradiction:
Improvecurrent-carrying capacityVSAvoidcosts
Core Design Contradiction:
PowerVSEase of manufacture

Solution Approach 1:

The patent combines the heat capacity element with the contact element into a single integrated component. This merging eliminates the need for separate thermal management components, reducing overall manufacturing complexity and cost while enabling higher current-carrying capacity.

Inventive Principle:
Principle #5Merging (Combining)

Solution Approach 2:

By changing the thermal parameters through integration rather than increasing physical dimensions, the patent avoids the cost penalties associated with larger materials, manufacturing, and assembly. The integrated design maintains cost-effectiveness while achieving higher power capability.

Inventive Principle:
Principle #35Parameter changes

4Temperature

If active cooling systems are implemented to dissipate heat, then contact element temperatures can be controlled, but device complexity increases

Engineering Contradiction:
Improvecontact element temperatureVSAvoidcooling system complexity
Core Design Contradiction:
TemperatureVSDevice complexity

Solution Approach 1:

The heat capacity element provides passive thermal management by automatically absorbing excess heat through its thermal mass. This self-service mechanism eliminates the need for active cooling systems with moving parts, control electronics, and external power sources, thereby reducing device complexity while maintaining temperature control.

Inventive Principle:
Principle #25Self-service

Solution Approach 2:

The patent converts the harmful effect of heat generation into a beneficial thermal management solution. The heat capacity element absorbs the thermal energy that would otherwise be harmful, transforming the heat problem into a controlled thermal storage function without requiring active cooling intervention.

Inventive Principle:
Principle #22Blessing in disguise (Convert harm into benefit)

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 solution effectively manages high charging currents by maintaining contact element temperatures below a predetermined limit, preventing overheating and extending the lifespan of charging system components.

Implementation Method 1

a heat capacity element arranged on the shaft section of the at least one contact element and firmly connected to the shaft section for absorbing heat from the at least one contact element

Methodology Applied
Scientific EffectHeat capacity: Thermal Energy Storage

Implementation Method 2

thermally connected to contact elements

Methodology Applied
Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentEP3433904B1A connector equipped with a thermal element
Publication Date: 2021.01.06 PHOENIX CONTACT E MOBILITY GMBH
  • EP3433904B1 patent drawingFigure 1~2
  • EP3433904B1 patent drawingFigure 3A~3B
  • EP3433904B1 patent drawingFigure 4A~4B

AI summary

The invention relates to a plug-in connector part (5) for connecting to a mating plug-in connector part (3), comprising a housing (50) which has a plug-in section (500, 501) for the plug-in connection to the mating plug-in connector part (3), and at least one contact element (51A, 51B) comprising a shaft section (510), arranged on the plug-in section (500, 501), and designed to electrically contact an associated mating contact element (31) of the mating plug-in connector part (3). The invention also relates to a heat capacity element (54A, 54B) which is arranged on the shaft section (510) of the at least one contact element (51A, 51B), is secured to said shaft section (510), and receives heat from the at least one contact element (51A, 51B). In this way, a plug-in connector part with a contact element is provided, which can have a high current-carrying capacity, for example for use in a charging system for charging an electric vehicle.