Electric Working Machine Fast Charging With Battery Temperature Control
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Solution Overview
Problem
Quick charging of electric working machines can lead to increased battery temperatures, potentially restricting power output and hindering operations, as existing systems lack control over charging parameters.
Innovation Solution
An electric working machine with a manual operator and controller that adjusts electric current from an external fast charger based on set charging parameters, including temperature monitoring and display of permissible ranges, to prevent excessive temperature rise and ensure safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If quick charging is performed using large electric current, then charging time is reduced, but battery temperature increases
Solution Approach 1:
The charging system dynamically adjusts the charging current based on real-time battery temperature monitoring. The controller modifies the charging parameters during the charging process to maintain battery temperature within safe limits while still achieving fast charging, rather than using a fixed high current throughout.
Solution Approach 2:
The system changes charging parameters (current magnitude) based on battery temperature conditions. By monitoring temperature and adjusting the charging current accordingly, the system optimizes the balance between charging speed and temperature control, preventing excessive heat generation while maintaining efficient charging.
2Ease of operation
If quick charging is performed even when battery does not need charging, then charging operation is simplified, but work after charging is hindered due to power output restriction
Solution Approach 1:
The charging system incorporates feedback mechanisms that monitor battery status (charge level, temperature) and provide information to the controller. This feedback enables intelligent decision-making about when to initiate charging and how to adjust charging parameters, preventing unnecessary charging operations that would lead to power output restrictions and work hindrance.
Solution Approach 2:
The system performs preliminary assessment of battery status before initiating charging. By checking whether the battery actually needs charging and evaluating current temperature conditions beforehand, the system avoids starting charging operations that would result in power output restrictions, thereby preserving work capability.
3Reliability
If manual operator is added to set charging parameters, then charging control is improved, but device complexity increases
Solution Approach 1:
The manual operator interface serves multiple functions: it allows users to set charging parameters, view battery status information, and receive system feedback. This multi-functionality justifies the added complexity by providing comprehensive control and monitoring capabilities in a single integrated interface.
Solution Approach 2:
The system provides self-service capabilities through the manual operator interface, allowing users to independently adjust charging parameters based on their specific needs and conditions. This reduces the need for complex automated decision-making algorithms while still providing reliable charging control through user expertise.
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 solution allows for controlled charging that reduces the likelihood of power output restrictions, enabling uninterrupted operation after charging by setting appropriate charging parameters according to the machine's state and usage.
Implementation Method 1
The battery monitor may be configured or programmed to detect at least a temperature of the battery as the status of the battery
Implementation Method 2
a fast charger to change a value of electric current supplied via the charging cable to the electric working machine according to a command from the electric working machine
Implementation Method 3
a controller to change a value of electric current supplied from the fast charger to the battery unit according to the at least one charging parameter set via the manual operator
Data Source
AI summary
An electric working machine includes an electric actuator, a battery unit including a battery to supply electricity to the electric actuator, a working device to operate using a driving force from the electric actuator, a charging port to be connected to an external fast charger via a charging cable, a manual operator to be operated to set at least one charging parameter, and a controller to change a value of electric current supplied from the fast charger to the battery unit according to the at least one charging parameter set via the manual operator.