Electric Drive Heating for EV Battery Pack Warm-Up

Solution Overview

Problem

Conventional electric vehicles require additional heating apparatuses to maintain power battery packs at optimal temperatures in low-temperature environments, which increases costs and occupies space.

Innovation Solution

An electric drive system that utilizes an inverter circuit and direct current-direct current conversion circuit to convert and adjust currents for an electric excitation synchronous motor, generating heat to warm the power battery pack without additional heating apparatuses, thereby reducing costs and saving space.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If an additional heating apparatus is added to heat the power battery pack, then the heating function is improved, but the device complexity and cost increase

Engineering Contradiction:

Improvepower battery pack temperatureVSAvoidheating system complexity

Core Design Contradiction:

TemperatureVSDevice complexity

Solution Approach 1:

The motor windings and excitation winding generate heat through their own electromagnetic operation to heat the power battery pack, eliminating the need for separate heating apparatus. The system serves itself by utilizing the inherent resistive heating of existing components during motor operation.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The motor windings and excitation winding serve dual functions: driving the motor and heating the power battery pack. These existing components are utilized for both propulsion and thermal management, reducing the need for additional dedicated heating equipment.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Temperature

If an additional heating apparatus is added to heat the power battery pack, then the heating function is improved, but the space occupation increases

Engineering Contradiction:

Improvepower battery pack temperatureVSAvoidspace occupation

Core Design Contradiction:

TemperatureVSVolume of moving object

Solution Approach 1:

The motor windings and excitation winding generate heat through their own electromagnetic operation to heat the power battery pack, eliminating the need for separate heating apparatus. The system serves itself by utilizing the inherent resistive heating of existing components during motor operation.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The motor windings and excitation winding serve dual functions: driving the motor and heating the power battery pack. These existing components are utilized for both propulsion and thermal management, reducing the need for additional dedicated heating equipment.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Temperature

If additional heating apparatus is added, then the heating capability is improved, but the manufacturing cost increases

Engineering Contradiction:

Improvepower battery pack temperatureVSAvoidmanufacturing cost

Core Design Contradiction:

TemperatureVSEase of manufacture

Solution Approach 1:

The motor windings and excitation winding generate heat through their own electromagnetic operation to heat the power battery pack, eliminating the need for separate heating apparatus. The system serves itself by utilizing the inherent resistive heating of existing components during motor operation.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The motor windings and excitation winding serve dual functions: driving the motor and heating the power battery pack. These existing components are utilized for both propulsion and thermal management, reducing the need for additional dedicated heating equipment.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 system effectively heats the power battery pack using heat generated by the motor windings and excitation winding, improving heating efficiency and reducing costs by eliminating the need for extra heating components.

Implementation Method 1

The power battery pack is heated by using heat generated by the three-phase windings and the excitation winding

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Data Source

PatentUS12539777B2Electric drive system, powertrain, heating method, and electric vehicle

Publication Date: 2026.02.03 HUAWEI DIGITAL POWER TECH CO LTD

AI summary

An electric drive system and a heating method. The electric drive system includes an inverter circuit, a direct current-direct current conversion circuit, and a controller. An input end of the inverter circuit is connected to an input end of the electric drive system, and an output end of the inverter circuit is connected to three-phase motor windings of an electric excitation synchronous motor. An input end of the direct current-direct current conversion circuit is connected to the input end of the electric drive system, and an output end of the direct current-direct current conversion circuit is connected to an excitation winding of the electric excitation synchronous motor. In this solution, a heating apparatus does not need to be disposed when the power battery pack is heated, thereby reducing costs and saving space.