Lithium-Ion Battery Control for Industrial Trucks
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Solution Overview
Problem
Existing methods for controlling lithium-ion batteries in industrial trucks do not effectively optimize the number of charge/discharge cycles, leading to reduced service life, as they often operate at maximum capacity, which is not always necessary.
Innovation Solution
A method that allows the lithium-ion battery management system to select between different operating modes, reducing the maximum charge and increasing the minimum discharge, enabling adaptation to actual capacity needs, thereby extending the battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the lithium-ion battery is charged to maximum capacity and discharged to minimum value in each cycle, then the full capacity of the battery is available for use, but the number of charge/discharge cycles is reduced and service life is shortened
Solution Approach 1:
The patent applies dynamics by making the charge/discharge limits adjustable rather than fixed. The battery management system dynamically adapts the maximum charge and minimum discharge thresholds based on operating conditions, allowing the system to optimize between capacity utilization and cycle life extension depending on the specific operational context.
Solution Approach 2:
The patent changes the parameters of maximum charge and minimum discharge values from fixed full-capacity settings to variable thresholds. By modifying these critical parameters, the system can reduce stress on the battery cells during charge/discharge cycles, thereby extending the number of cycles while still meeting the operational requirements of the industrial truck.
2Productivity
If the maximum capacity of the lithium-ion battery is always used, then the productivity of the industrial truck is maximized, but the service life of the battery is reduced
Solution Approach 1:
The system dynamically adjusts the charge/discharge thresholds based on real-time operating conditions, allowing the battery to operate at full capacity when needed for maximum productivity, while reducing stress during less critical periods to extend service life. This dynamic adaptation resolves the contradiction between immediate productivity and long-term durability.
Solution Approach 2:
The patent implements periodic monitoring and adjustment of charge/discharge parameters. The battery management system continuously evaluates operating conditions and periodically modifies the charge/discharge thresholds to balance productivity requirements with service life extension, creating a rhythm of full-capacity operation interspersed with reduced-stress cycles.
3Use of energy by moving object
If the battery is always charged to full capacity, then the energy availability for operation is maximized, but the number of cycles before deterioration is reduced
Solution Approach 1:
The patent changes the energy management parameters by adjusting the maximum charge threshold from 100% to a lower value under certain conditions. This parameter modification reduces the electrical stress on battery cells during charging, thereby improving cycle stability and reducing deterioration while maintaining sufficient energy availability for operational needs.
Solution Approach 2:
The system applies partial charging action by intentionally not charging the battery to full capacity in certain operating scenarios. This partial charging approach is sufficient to meet energy availability requirements while avoiding the excessive stress that would accelerate battery deterioration, thus improving cycle stability.
Data Source
AI summary
In a method for controlling a lithium-ion battery as a traction battery of a forklift truck, wherein the lithium-ion battery in a battery housing comprises at least one battery cell and a battery management system with monitoring and control devices, and the battery management system controls the maximum charge and minimum discharge of the lithium-ion battery, a control command transmitted to the battery management system allows selection between different operating modes, wherein at least one operating mode has a reduced maximum charge and/or increased minimum discharge.