Removable Battery Cartridge Drive System for Motor Output
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Solution Overview
Problem
Existing vehicle drive systems using high-voltage batteries for motor cruising face challenges in increasing motor output while maintaining cruising distance, weight, and cost efficiency, due to voltage fluctuations between serially connected batteries affecting torque and motor performance.
Innovation Solution
A vehicle drive system configuration where the connection node of serially connected batteries is grounded, utilizing a 3-level inverter to generate motor drive voltage higher than battery voltage, and incorporating a control unit to balance charged amounts and voltages between batteries, with removable battery cartridges for easy replacement and parallel connection of auxiliary batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a high-voltage battery (60V or higher) is used to increase motor output, then motor output increases, but vehicle weight and cost increase due to larger wires and expensive high-voltage connectors
Solution Approach 1:
The battery system is segmented into multiple battery units (first battery and second battery) that can be independently managed. Each battery unit operates at a lower voltage level, avoiding the need for high-voltage components while achieving the required motor output through coordinated operation of multiple units.
2Power
If a high-voltage battery (60V or higher) is used to increase motor output, then motor output increases, but device cost increases due to expensive high-voltage connectors and components
Solution Approach 1:
The battery system is segmented into multiple battery units (first battery and second battery) that can be independently managed. Each battery unit operates at a lower voltage level, avoiding the need for high-voltage components while achieving the required motor output through coordinated operation of multiple units.
Solution Approach 2:
The system changes the voltage parameter by using multiple lower-voltage batteries instead of a single high-voltage battery. This parameter change allows the use of standard, cost-effective components throughout the system while maintaining the electrical power needed for motor operation.
3Power
If serially connected batteries are used to generate motor drive voltage higher than battery voltage, then motor output increases, but torque fluctuations occur due to variations in charged amount and voltage between batteries
Solution Approach 1:
The control unit continuously monitors the charged amount and voltage of each battery unit and uses this feedback information to adjust the discharge rates and switching timing. This feedback control maintains balanced operation of the batteries and stabilizes the motor drive voltage, preventing torque fluctuations.
Solution Approach 2:
The system dynamically adjusts the operation parameters of each battery unit based on real-time conditions. The control unit modifies discharge rates, switching timing, and power distribution to accommodate variations in battery charged amounts, ensuring stable motor operation despite initial imbalances.
4Speed
If a capacitor is used instead of a battery for acceleration, then responsiveness improves, but cruising distance decreases due to small energy density
Solution Approach 1:
The system merges the advantages of both capacitors and batteries by using multiple battery units that can be rapidly switched and combined. The battery units provide high instantaneous current similar to capacitors while maintaining the high energy density needed for long cruising distance, achieving both responsiveness and endurance.
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 configuration increases motor output, reduces vehicle weight and cost, and enhances cruising distance by minimizing torque fluctuations and optimizing battery performance, while allowing for easy battery replacement and balancing of charged amounts.
Implementation Method 1
a 3-level inverter is used as the inverter, so that a motor drive voltage higher than the battery voltage is generated
Implementation Method 2
a low-voltage battery and a capacitor are serially connected, forming a high-voltage power supply for driving the motor
Implementation Method 3
the connection node of serially connected first and second batteries is connected to the ground, to reduce the voltage output from the battery unit
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
In a vehicle drive system using a motor for cruising, the connection node of serially-connected first and second batteries is grounded. The operation of an inverter is controlled so that the motor drive voltage is higher than the output voltage of each of the first and second batteries. A battery unit is configured so that third and fourth batteries each in a form of a cartridge are removably loaded, and the loaded third battery is connected in parallel with the first battery and the loaded fourth battery is connected in parallel with the second battery.