Straddled Electric Vehicle Dual Battery Charging System
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Solution Overview
Problem
Electric motorcycles face challenges in charging their batteries, particularly when the batteries are heavy due to increased capacity or output voltage, making it difficult to demount and charge them, especially when a public charging station is needed for extended travel ranges.
Innovation Solution
A straddled electric vehicle design featuring two batteries that can be mounted and demounted independently, with a master-slave battery configuration allowing for charging either on or off the vehicle, using a controller to manage charging and communication with external charging devices, enabling serial or parallel connections for optimal power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the battery capacity or output voltage is increased to ensure longer travel range or higher output, then the power and energy storage are improved, but the battery weight increases making it difficult to demount and carry
Solution Approach 1:
The battery system is divided into a first battery and a second battery that can be independently demounted. This segmentation allows the total battery capacity to be maintained for high power output while enabling easier handling by allowing users to remove only one battery at a time, reducing the effective weight burden during demounting operations.
2Use of energy by moving object
If the battery capacity is increased to ensure longer travel range, then the energy storage is improved, but the battery weight increases making it difficult to demount for charging
Solution Approach 1:
The battery system is divided into a first battery and a second battery that can be independently demounted. This segmentation allows the total battery capacity to be maintained for long travel range while enabling easier handling by allowing users to remove only one battery at a time, reducing the effective weight burden during demounting operations.
3Use of energy by moving object
If a single heavy battery is used to extend travel range, then the energy storage is improved, but the complexity of charging system increases when needing to support both mounted and demounted charging states
Solution Approach 1:
The charging system is designed with universal charging interfaces on both the vehicle body (first charging device) and the individual batteries (second charging device). This allows the same charging protocol and connector type to be used whether charging the vehicle-mounted batteries or the demounted battery, simplifying the overall charging system architecture and reducing the need for multiple specialized charging systems.
Solution Approach 2:
The controller acts as an intermediary that manages charging operations for both the first charging device (vehicle-mounted) and the second charging device (battery-mounted). It automatically determines the appropriate charging configuration based on which batteries are present and connected, simplifying the control logic by providing a single point of management rather than separate control systems for each charging scenario.
Data Source
Figure 1
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Figure 3
AI summary
In a straddled electric vehicle (1), two batteries (20) are able to be independently mountable on and demountable from a vehicle body. An inlet (35) is provided to the vehicle body. Power received from a first charging device (70) via an inlet (35) is supplied to the two batteries (20) via a power line PL. Each of the two batteries (20) comprises a connector (23) for connection to a second charging device (80) when the batteries (20) are demounted from the vehicle body, and a controller (22A) for controlling charging of the battery (20) by the second charging device (80). According to the straddled electric vehicle (1), it is possible to facilitate charging of a battery in the state of being demounted from the vehicle body and also to charge the battery in the state of being mounted on the vehicle body.