Lift Battery Heating and Power Control Under Current Limits
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Solution Overview
Problem
Conventional lift devices rely on hydraulic systems, which require on-board reservoir tanks and can be cumbersome and maintenance-intensive, lacking the efficiency and environmental benefits of electric systems.
Innovation Solution
The development of a lift device powered by a rechargeable battery system and electric motors, featuring a control system that manages battery usage and limits operational speeds based on current delivery and regeneration limits, eliminating the need for hydraulic systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If hydraulic systems are used to power the lift device, then lifting capability and force are improved, but device complexity and maintenance requirements increase due to on-board reservoir tanks and hydraulic fluid systems
Solution Approach 1:
The patent replaces the hydraulic mechanical system with an electric system consisting of electric motors and battery power sources. This substitution eliminates the need for hydraulic reservoir tanks, hydraulic fluid, and associated complex mechanical components while maintaining the lifting capability through electromagnetic force generation in the motors.
Solution Approach 2:
The patent extracts and removes the hydraulic system components (reservoir tanks, hydraulic fluid, hydraulic cylinders) from the lift device, replacing them with a simplified electric powertrain. This extraction reduces device complexity by eliminating unnecessary hydraulic infrastructure while preserving the essential lifting function.
2Force
If hydraulic systems are used to power the lift device, then lifting capability is maintained, but maintenance intensity and environmental impact worsen due to hydraulic fluid requirements
Solution Approach 1:
The patent substitutes the maintenance-intensive hydraulic system with a cleaner electric system. Electric motors and battery systems require significantly less maintenance compared to hydraulic systems, as they eliminate issues related to hydraulic fluid degradation, leaks, and contamination. This substitution directly improves ease of repair and reduces maintenance intensity.
Solution Approach 2:
The patent employs battery systems that can be replaced rather than repaired, and electric motor components that are generally more durable and require minimal maintenance. This approach trades complex, maintenance-heavy hydraulic components for simpler, more replaceable electric components that reduce overall maintenance burden.
3Productivity
If battery system operates at high power, then lifting speed and productivity are improved, but battery current delivery limits and heat generation worsen operational reliability
Solution Approach 1:
The patent implements a control system that continuously monitors battery state of charge, current delivery capacity, and temperature. This feedback mechanism allows the system to dynamically adjust motor power output and lifting speed to remain within safe battery operational limits, preventing overheating and ensuring reliable operation while maximizing productivity within available power constraints.
Solution Approach 2:
The patent employs dynamic power management where the lift device can vary its power consumption and operating speed based on real-time battery conditions. The system can operate at high power when battery capacity allows and reduce power consumption when approaching current delivery limits or temperature thresholds, creating a dynamic balance between productivity and reliability.
4Reliability
If battery is heated during charging, then battery performance and longevity are improved, but energy consumption and charging time increase
Solution Approach 1:
The patent applies preliminary heating to the battery before the charging process begins or during early stages of charging when the battery is cold. This preliminary action prepares the battery chemistry for optimal charge acceptance, improving longevity and charging efficiency. By heating in advance rather than continuously during charging, the system minimizes total energy consumption and charging time while still achieving the beneficial thermal effects.
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 enables a fully electric lift device that is more efficient, requires less maintenance, and reduces environmental impact by eliminating hydraulic fluids and systems, while maintaining reliable operation.
Implementation Method 1
The battery is configured to selectively apply power to the linear actuator and the drive motor
Implementation Method 2
The heating system is configured to selectively provide heat to the battery
Data Source
AI summary
A rechargeable battery system for a lift device includes a battery configured to power at least one component of the lift device, a heating system configured to selectively provide heat to the battery, and a battery charger connected to the battery and to the heating system. The heating system is configured to selectively receive power from the battery through a battery power connection or from the battery charger through a battery charger power connection.