EV Battery Preheating Aligned With Charging Pile Arrival

Solution Overview

Problem

Lithium cells in electric vehicles experience reduced performance and charging efficiency at low temperatures due to decreased activity of positive and negative electrode materials and conductivity of electrolytes, leading to slow charging and increased charging anxiety in cold environments.

Innovation Solution

A vehicle battery preheating method that dynamically adjusts heating power based on estimated heating duration and traveling duration to ensure the battery reaches the target temperature when arriving at a charging station, improving charging efficiency and reducing charging time.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If battery heating is performed in low-temperature environment, then battery performance and charging efficiency are improved, but charging time increases and user waiting time increases

Engineering Contradiction:

Improvecharging efficiencyVSAvoidcharging time

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The system performs preliminary heating of the battery before charging by using vehicle power consumption during travel to the charging station. The heating is started in advance and controlled to reach optimal temperature by the time charging begins, avoiding the need to heat during charging wait time.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The heating power is dynamically adjusted based on real-time temperature monitoring and predicted arrival time. The system modifies heating intensity according to actual battery temperature and remaining travel time, optimizing the balance between heating effectiveness and energy consumption.

Inventive Principle:

Principle #15Dynamics

2Duration of action of moving object

If heating power is increased to reduce heating time, then battery reaches target temperature faster, but energy consumption increases

Engineering Contradiction:

Improveheating durationVSAvoidenergy consumption

Core Design Contradiction:

Duration of action of moving objectVSUse of energy by moving object

Solution Approach 1:

The heating power is dynamically adjusted based on real-time temperature monitoring and predicted arrival time. The system modifies heating intensity according to actual battery temperature and remaining travel time, optimizing the balance between heating effectiveness and energy consumption.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system continuously monitors battery temperature and compares it with target temperature, adjusting heating power based on the temperature difference and time to arrival. This feedback mechanism ensures minimal energy consumption while achieving the required heating level.

Inventive Principle:

Principle #23Feedback

3Speed

If battery temperature is maintained at optimal level, then charging speed is improved, but heating control complexity increases

Engineering Contradiction:

Improvecharging speedVSAvoidheating control complexity

Core Design Contradiction:

SpeedVSDevice complexity

Solution Approach 1:

The system continuously monitors battery temperature and compares it with target temperature, adjusting heating power based on the temperature difference and time to arrival. This feedback mechanism ensures minimal energy consumption while achieving the required heating level.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system automatically determines the optimal heating strategy based on pre-stored temperature-power correspondence relationships, eliminating the need for complex real-time calculations or user intervention.

Inventive Principle:

Principle #25Self-service

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 method enhances battery heating efficiency, reduces charging duration, and improves overall charging performance by synchronizing heating with vehicle travel time to the charging station, thus addressing the low-temperature limitations of lithium cells.

Implementation Method 1

heating the battery according to the current estimated heating duration and a traveling duration of the vehicle traveling to the target charging pile

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Data Source

PatentUS20240274917A1Vehicle battery preheating method and apparatus, vehicle and readable storage medium

Publication Date: 2024.08.15 XIAOMI EV TECH CO LTD

AI summary

A vehicle battery preheating method, computer readable medium and apparatus for improving the charging of a battery. The charging of the battery is improved by: determining a target charging pile for charging a battery of a vehicle; estimating, in a process of the vehicle traveling to the target charging pile, a remaining electric quantity at a time of the vehicle traveling to the target charging pile; determining a target temperature of the battery according to charging power of the target charging pile and the remaining electric quantity; determining a current first target heating rate of the battery, and determining a current estimated heating duration of the battery from a current temperature to the target temperature according to the current first target heating rate; and heating the battery according to the current estimated heating duration and a traveling duration of the vehicle traveling to the target charging pile.