Battery Pack Circuit for Cold-Temperature Lithium Plating Prevention
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Solution Overview
Problem
Lithium-ion batteries are prone to lithium plating when charged at temperatures below 15 degrees C, which can lead to malfunction and damage, posing a challenge for replacing lead-acid batteries in industrial machinery like forklifts that operate in various temperatures.
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 prevent lithium plating by dissipating power as heat when temperatures are low, ensuring safe charging and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If lithium-ion batteries are charged at temperatures below 15 degrees C, then charging speed and energy storage capacity are improved, but lithium plating occurs causing malfunction and damage
Solution Approach 1:
A temperature management system acts as an intermediary between the battery and charging environment. The system includes temperature sensors that monitor battery temperature and a control circuit that regulates charging current based on temperature readings, preventing lithium plating by adjusting charging parameters when temperature drops below 15 degrees C
Solution Approach 2:
The charging parameters (current, voltage, power) are dynamically changed based on temperature conditions. When temperature is below 15 degrees C, the system reduces charging current and power to prevent lithium plating, while allowing normal charging when temperature is adequate
2Loss of energy
If regenerative braking power is fully utilized, then energy recovery is maximized, but lithium plating occurs in cold temperatures
Solution Approach 1:
The system employs feedback control where temperature sensors continuously monitor battery temperature and feed this information to the control circuit. The control circuit then adjusts regenerative braking power accordingly - reducing or disabling regenerative charging when temperature is below 15 degrees C to prevent lithium plating, while allowing full regenerative braking when temperature is adequate
Solution Approach 2:
The regenerative braking system transitions from a static fixed-power design to a dynamic temperature-adaptive design. The system automatically adjusts regenerative braking power levels based on real-time temperature conditions, making the energy recovery process flexible and safe across varying environmental conditions
3Duration of action of moving object
If lead-acid batteries are replaced with lithium-ion batteries, then operational life and charging time are extended, but temperature sensitivity and lithium plating risk increase
Solution Approach 1:
A temperature management system with sensors and control circuits is introduced as an intermediary to monitor and regulate battery temperature and charging parameters, preventing lithium plating and enabling safe operation in cold temperatures
Solution Approach 2:
The temperature management system operates autonomously, with temperature sensors automatically detecting temperature conditions and the control circuit automatically adjusting charging parameters without user intervention, making the complex system transparent to the end user
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
The solution effectively prevents lithium plating, allowing lithium-ion batteries to be used in place of lead-acid batteries without compromising regenerative braking functions, extending the time between charges and enhancing the operational life of industrial machinery.
Implementation Method 1
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 prevent lithium plating by dissipating power as heat when temperatures are low
Data Source
AI summary
A lithium battery pack is described. The lithium battery pack includes a lithium battery having a plurality of battery units connected together in a series configuration, and an environmental management circuit in parallel with the plurality of battery units of the lithium battery. The environmental management circuit has a load distributed through the lithium battery, and circuitry operable to block energy directed to the lithium battery when a temperature of the lithium battery is below a predetermined threshold; and direct the energy to the load distributed through the lithium battery to warm the lithium battery.