LMFP Battery Charging with Temperature-Controlled Preheating
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Solution Overview
Problem
The charging rate of lithium manganese iron phosphate batteries is relatively low, and their capacity cannot be fully utilized due to slow delithiation speed and low delithiation depth of the positive electrode active material, which affects the charging performance.
Innovation Solution
A battery system with a temperature sensor and a battery management system that controls a heating apparatus to maintain the battery temperature within a specific range during charging, using a control instruction based on state parameters to enhance delithiation depth and ion diffusion speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lithium manganese iron phosphate battery is used, then safety and stability are improved, but charging rate and capacity utilization deteriorate due to slow delithiation speed
Solution Approach 1:
The patent applies parameter changes by controlling the battery temperature within a specific range (20°C to 45°C) during charging. The battery management system adjusts heating or cooling parameters to maintain optimal temperature, which accelerates lithium ion diffusion and delithiation processes while preserving the safety benefits of lithium manganese iron phosphate material
Solution Approach 2:
The patent implements preliminary action by pre-heating the battery to optimal temperature before charging begins. The battery management system detects initial temperature and activates heating elements in advance, ensuring the battery reaches optimal charging temperature before the charging process starts, thereby improving charging rate from the outset
2Device complexity
If conventional charging control is used, then system simplicity is maintained, but charging time increases due to low delithiation depth
Solution Approach 1:
The patent implements feedback control through the battery management system that continuously monitors charging current, voltage, and temperature parameters. Based on real-time feedback, the system dynamically adjusts charging current and temperature control to optimize delithiation depth and reduce charging time, achieving fast charging with enhanced control mechanisms
3Productivity
If heating apparatus is added to control temperature, then delithiation speed and capacity are improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing the battery management system to perform multiple functions: monitoring battery state, controlling charging current, and managing temperature control. The same control unit that manages charging also regulates heating/cooling operations, eliminating the need for separate dedicated control systems and reducing overall device complexity
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 approach increases the battery capacity and reduces charging time by reducing polarization and enhancing lithium ion diffusion, meeting fast charging requirements and improving user experience.
Implementation Method 1
the control instruction is configured to control the heating apparatus to heat the battery cell
Data Source
AI summary
A battery system comprises: a battery pack comprising at least one battery cell, and a temperature sensor, a battery management system and a heating apparatus, wherein a positive-electrode active material of the battery cell comprises a lithium-containing transition metal phosphate, the lithium-containing transition metal phosphate at least comprising a manganese element; the temperature sensor is used for acquiring the temperature of the battery cell; and the battery management system is used for acquiring a first state parameter of the battery cell before and/or during a charging process of the battery cell, the first state parameter of the battery cell being used for generating a control instruction for the heating apparatus, and the control instruction being used for controlling the heating apparatus to heat the battery cell.