LiMPO4 Battery Charging Temperature Control for Faster Delithiation
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Solution Overview
Problem
Batteries using LiMPO4 as the positive electrode active material face low delithiation depth and slow charging rates due to the material's properties, limiting capacity utilization and charging performance.
Innovation Solution
A Battery Management System (BMS) controls the battery temperature within a preset range during charging to enhance delithiation depth and charging capacity by sending heating instructions to a heating apparatus based on state parameters like temperature and state of charge (SOC).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If LiMPO4 material is used as the positive electrode active material, then the battery achieves high energy density and large capacity, but the delithiation depth is low and the charging rate is slow
Solution Approach 1:
The patent applies parameter changes by controlling the battery temperature within a specific range (20°C to 45°C) during charging. This temperature control parameter optimization enhances the delithiation depth and charging rate of LiMPO4 material without changing the material composition, thereby resolving the contradiction between high capacity and fast charging performance
2Use of energy by moving object
If LiMPO4 material is used as the positive electrode active material, then the battery achieves high energy density, but the delithiation depth is low which limits capacity utilization
Solution Approach 1:
The patent utilizes parameter changes through precise temperature control (20°C to 45°C) during charging to optimize the electrochemical reactions of LiMPO4 material. This ensures both high energy density and full capacity utilization by enhancing lithium ion diffusion and delithiation depth without material modification
3Productivity
If temperature control is implemented during charging, then the delithiation depth and charging capacity are increased, but the device complexity increases
Solution Approach 1:
The patent applies self-service by utilizing the battery's own internal heat generation during charging to maintain its temperature within the optimal range (20°C to 45°C). The BMS monitors and controls the charging process to leverage self-heating effects, eliminating the need for external heating or cooling systems and reducing device complexity while improving charging capacity
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 charging capacity and performance by optimizing delithiation depth and lithium ion diffusion rates, reducing power consumption and minimizing battery damage.
Implementation Method 1
send a heating instruction to an apparatus for heating the battery in response to the charging instruction
Implementation Method 2
a BMS, configured to control a temperature of the battery in response to a charging instruction, so that the temperature of the battery remains within a preset temperature range during at least part of stages of a charging process
Data Source
AI summary
A battery, a charging device, a battery charging method, a battery management system and an electrical apparatus. The battery comprises: at least one battery cell, a positive electrode active material of the battery cell comprising LiMPO4, and M comprising Mn element and Fe element; and the battery management system, used for controlling the temperature of the battery in response to a charging instruction, such that the temperature of the battery during at least part of a charging process is within a preset temperature range.