Motor Control Switch Circuit for Low-Temperature Battery Self-Heating
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing battery heating methods are inefficient, particularly at low temperatures, limiting the charging and discharging performance of lithium-ion batteries and affecting the adaptability of electric vehicles in cold environments.
Innovation Solution
A switch device and motor control device that form an electric loop with a battery and motor winding, allowing for energy storage and release to achieve battery self-heating, enhancing heating efficiency by using a combination of switches and energy storage means, such as inductors, to manage current flow and reduce noise and inverter switch losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional battery heating methods are used, then heating function is provided, but heating efficiency is low and cannot meet user needs
Solution Approach 1:
The patent combines the battery heating function with the motor control device by integrating a switch device that can operate in conjunction with the electric loop. The first switch means and second switch means are integrated into the motor control device shell, allowing the heating function to be merged with the existing motor control system, thereby improving heating efficiency while utilizing existing structural space.
Solution Approach 2:
The switch device is designed to serve multiple functions: it can control motor operation and simultaneously provide battery heating capability. The first switch means and second switch means can be configured in different ways (with diodes, without diodes, with energy storage means) to achieve both motor control and battery heating functions through the same integrated device structure.
2Productivity
If battery self-heating is achieved through electric loop with motor winding, then heating efficiency improves, but device complexity increases
Solution Approach 1:
The patent merges the battery heating circuit components with the motor control device structure. The switch device, energy storage means, and associated terminals are all integrated within the motor control device shell, combining multiple functions into a single integrated unit rather than separate components.
Solution Approach 2:
The switch device is segmented into modular components: first switch means, second switch means, energy storage means, and control terminal, each with specific functions. This modular segmentation allows for flexible configuration and simplifies the overall design by breaking down the complex heating control into manageable functional segments.
3Power
If energy storage means are added to enhance current during battery self-heating, then heating effect improves, but device complexity and component count increase
Solution Approach 1:
The energy storage means (inductor) is integrated within the motor control device shell alongside the switch means, merging the power enhancement function with the existing control structure. This eliminates the need for separate external components and reduces overall system complexity despite adding functional capability.
Solution Approach 2:
The energy storage means serves dual purposes: it supports motor operation by providing energy storage and release during motor control, and simultaneously enhances current during battery self-heating operations. This multi-functionality justifies the addition of the component without proportionally increasing system complexity.
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
Improves battery heating efficiency, increases current during self-heating, and extends the life of the inverter by managing energy storage and release effectively, thus enhancing the adaptability of electric vehicles to low-temperature environments.
Implementation Method 1
the energy storage means includes at least one inductor. Such a design can enhance the energy storage and release of a battery heating circuit, thereby increasing the current during battery self-heating
Implementation Method 2
a battery and a motor winding serving as an energy storage means in the electric loop may be used to store and release energy back and forth to achieve the purpose of battery self-heating
Data Source
AI summary
The present application provides a switch device, a motor control device, a battery heating system, and an electric apparatus. The switch device includes a first switch means and a second switch means which are arranged in a shell. A second terminal of the first switch means and a first terminal of the second switch means are both connected to the outside of the shell; a first terminal of the first switch means and a second terminal of the second switch means are respectively connected to the outside of the shell; and a control terminal of the first switch means and a control terminal of the second switch means are connected to the outside of the shell.