EV Battery Self-Heating via Dual-Motor Oscillation Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing battery self-heating technologies for electric vehicles are inefficient and costly, particularly in low-temperature environments, as they rely on external heating or limited internal heating through battery cycles.
Innovation Solution
A battery self-heating apparatus utilizing dual motors and dual electric controls, where the motors are connected through a neutral line to facilitate low-frequency oscillation heating, enhancing heating efficiency and power while reducing costs by utilizing existing vehicle components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If external heating devices are added to heat the battery in low temperature environments, then the battery temperature can be increased, but the cost increases and heating efficiency decreases
Solution Approach 1:
The battery system uses its own motors and power electronics to generate heat through controlled charging-discharging cycles, eliminating the need for external heating devices. The motors act as generators during regenerative braking or idle periods, converting mechanical energy to electrical energy that charges the battery, and the internal resistance of the battery generates heat during these charge-discharge cycles, achieving self-heating without additional heating equipment.
Solution Approach 2:
The existing motors and power electronics in the vehicle are made to serve dual functions: their primary function for vehicle propulsion and their secondary function for battery heating. By controlling the motors to operate in generator mode during idle periods or regenerative braking, the system utilizes these components for both driving and heating purposes, reducing the need for dedicated heating equipment.
2Ease of manufacture
If internal heating through battery cycles is used, then the heating cost is reduced, but the heating power is limited
Solution Approach 1:
The system employs periodic charging-discharging cycles of the battery to generate heat. During regenerative braking or when the vehicle is idle, the motors generate electricity that charges the battery, and during subsequent discharge phases, the battery's internal resistance generates heat. This periodic cycling continues until the desired temperature is reached, accumulating thermal energy over time to achieve sufficient heating power without requiring high instantaneous power input.
Solution Approach 2:
The heating process maintains continuous useful action by utilizing any available opportunity for regenerative braking or motor idle operation to charge the battery, which in turn continuously generates heat through discharge cycles. The system maximizes the utilization of the battery's charge-discharge capability to sustain heating over extended periods, ensuring that heating power is accumulated and maintained throughout the cold environment operation.
3Productivity
If dual motors and dual electric controls are used for low-frequency oscillation heating, then heating efficiency and power are greatly improved, but the device complexity increases
Solution Approach 1:
The dual motors and dual electric controls, which may already be present in four-wheel-drive or all-electric vehicles, are made to serve an additional function of battery heating. By controlling these existing components to operate in coordinated charging-discharging cycles, the system achieves enhanced heating efficiency and power without adding dedicated heating equipment, as the motors and controllers perform both propulsion and heating functions.
Solution Approach 2:
The heating function is merged with the existing motor control systems. The dual motors and their controllers are integrated into a unified control strategy that coordinates their operation for both vehicle propulsion and battery heating. By combining these functions into a single control architecture, the system achieves improved heating performance while minimizing additional complexity, as the same hardware serves multiple purposes.
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 solution significantly improves battery self-heating efficiency and power output, while minimizing costs by leveraging existing vehicle components, and allows for the export of excess heat to the vehicle passenger compartment.
Implementation Method 1
performing charging and discharging by mainly using a battery cycle, and generating heat relying on internal resistance of the battery
Data Source
AI summary
A battery self-heating apparatus and method, and a vehicle include a first energy processing apparatus, a second energy processing apparatus, and a controller connected to each other. The controller is configured to control connect/disconnect of a first inverter and a second inverter in a first preset state, to enable a first power battery and a second power battery to be charged/discharged through the first energy processing apparatus and the second energy processing apparatus, to implement heating of the first power battery and the second power battery.