Li-Ion Battery Heating Film Control for Rapid Low-Temperature Warm-Up
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing lithium-ion battery systems face challenges in achieving a high heating temperature rise rate with low energy consumption and minimal impact on battery life and safety in low-temperature environments, as they lack a comprehensive control method for combined internal and external heating.
Innovation Solution
A lithium-ion battery system incorporating a variable-resistance heating film, a heating control module, a data acquisition module, a current adjustment module, and a battery management system that dynamically adjusts heating power and rate based on state of charge and temperature data, enabling combined internal and external heating with flexible resistance selection and external power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If external heating film is arranged on the battery side with small contact surface, then the heating effect is limited, but the structure is simple
Solution Approach 1:
The heating film is divided into multiple heating loops with different resistances instead of using a single heating element. This segmentation allows selective activation of different heating zones and resistance values, improving heating effectiveness while maintaining structural simplicity through modular design
Solution Approach 2:
The heating system transitions from a fixed resistance heating film to a dynamic resistance selection system where different heating loops can be activated based on temperature requirements. The heating film resistance adjustment switch enables dynamic adaptation of heating characteristics to optimize heating effect
2Use of energy by moving object
If fixed heating mode is used with heating film embedded inside battery, then heating control is simple, but energy consumption and impact on battery life are not optimized
Solution Approach 1:
The heating control system implements dynamic resistance selection through the heating film resistance adjustment switch, allowing the system to adapt heating parameters based on battery state. This enables optimized energy consumption by selecting appropriate heating loops rather than using a fixed heating mode
Solution Approach 2:
The system changes heating parameters by selecting different heating loops with different resistances. This parameter variation allows optimization of heating efficiency and energy consumption based on actual battery temperature requirements, while the battery management system monitors and controls the heating process to minimize impact on battery life
3Power
If constant impedance heating film is used for self-heating, then the heating structure is simple, but power distribution between external heating film and self-generated heat cannot be effectively adjusted
Solution Approach 1:
The heating film is segmented into multiple heating loops with different resistances, enabling independent control of external heating power. This segmentation allows effective adjustment of power distribution between external heating and internal self-heating by selectively activating different heating loops based on battery conditions
Solution Approach 2:
The heating system transitions from constant impedance to variable impedance through the heating film resistance adjustment switch. This dynamic resistance adjustment enables flexible power distribution control between external and internal heating sources, optimizing the combined heating effect
4Temperature
If heating is performed in low-temperature environment, then battery can reach working temperature, but energy consumption increases and battery life is impacted
Solution Approach 1:
The battery management system monitors battery temperature and state of charge, dynamically adjusting heating parameters by selecting different heating loops with appropriate resistances. This parameter optimization minimizes heating energy consumption while ensuring the battery reaches its working temperature
Solution Approach 2:
The battery management system implements feedback control by monitoring battery temperature and state of charge, and adjusting the heating control module accordingly. This feedback mechanism optimizes heating energy consumption by activating heating only when necessary and selecting appropriate heating loops based on actual battery conditions
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 system achieves rapid heating in low-temperature environments with low energy consumption and minimal impact on battery life, ensuring safety by optimizing heating power distribution and rate through adaptive control of the heating film resistance and current adjustment.
Implementation Method 1
a variable-resistance heating film, a heating control module, a data acquisition module, a current adjustment module, and a battery management system that dynamically adjusts heating power and rate
Data Source
AI summary
A lithium-ion battery system and a control method for combined internal and external heating are provided. A battery is heated in a low-temperature environment through combined internal and external heating. The energy released during self-heating of the battery is fully used, and rapid heating of the battery in the low-temperature environment is implemented. A current adjustment module in a heating module is controlled to adjust a switch on-off frequency and a current on-off time during the heating, and loops with different heating resistances in a multi-loop heating film are selected through a resistance adjustment switch. In this way, target heating requirements of the battery are met, such as a high heating rate in a low-temperature environment, low energy consumption during the heating, and a small impact on battery life without jeopardizing safety during the heating.