Battery Management Circuit for Low-Temperature Lithium Plating Prevention
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Solution Overview
Problem
Lithium-ion batteries in industrial machinery, such as forklift trucks, are prone to lithium plating when charged at temperatures below 15 degrees C, which can lead to malfunction and damage, making it challenging to replace lead-acid batteries with lithium-ion batteries without incurring this issue.
Innovation Solution
A lithium-ion battery pack with an environmental management circuit that regulates regenerative braking power based on temperature, using a semiconductor device and a series of diodes to dissipate power as heat and prevent excessive current, thereby avoiding lithium plating at low temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If lithium-ion batteries are charged at temperatures below 15 degrees C, then charging can proceed, but lithium plating occurs causing malfunction and damage
Solution Approach 1:
The battery management circuit performs preliminary temperature assessment before charging begins. The processor evaluates the temperature condition and proactively determines whether to enable or disable charging, preventing lithium plating before it occurs by anticipating the harmful effect based on temperature measurement
Solution Approach 2:
The battery management circuit continuously monitors temperature during charging operations and provides feedback to the processor. This real-time feedback mechanism allows the system to adjust charging status dynamically, disabling charging when temperature drops below the safe threshold and enabling it when conditions are favorable
2Ease of operation
If regenerative braking power is not regulated at low temperatures, then braking function is maintained, but excessive current causes lithium plating
Solution Approach 1:
The battery management circuit acts as an intermediary between the regenerative braking system and the lithium-ion battery. It monitors temperature conditions and mediates power flow by enabling or disabling regenerative braking charging, thereby protecting the battery from harmful effects while preserving the braking function when conditions are safe
Solution Approach 2:
The system applies preliminary anti-action by disabling regenerative braking charging before excessive current can cause lithium plating. The processor anticipates the harmful effect based on temperature measurement and proactively prevents the harmful process by controlling the charging status
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
Enables the use of lithium-ion batteries in industrial machinery at various temperatures, including below 15 degrees C, without the risk of lithium plating, while maintaining regenerative braking functions and extending the time between charges.
Implementation Method 1
using a semiconductor device and a series of diodes to dissipate power as heat and prevent excessive current
Data Source
AI summary
A method of upgrading a work machine having a lead-acid battery coupled to a drive circuit and at least one motor is disclosed. In the method, a lead-acid battery is removed from the work machine. Then, a lithium-ion battery pack having a lithium ion battery and an environmental management circuit is connected to the work machine in circuit with the drive circuit and the at least one motor.