Battery Management System Low Temperature Charging
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Solution Overview
Problem
At low temperatures, electric vehicle and hybrid vehicle batteries experience reduced state of charge (SOC) and increased charging time, leading to decreased drive distance and prolonged charging periods.
Innovation Solution
A system and method that utilizes a battery management system to estimate temperature increase, calculate charging prediction times, and determine optimal discharging strategies to ensure full battery charge by managing charging and discharging information through CAN communication, thereby adjusting charging parameters to achieve full charge within a reduced timeframe.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If charging is performed at low battery temperature, then charging can proceed without additional heating equipment, but the battery cannot be fully charged and charging time increases
Solution Approach 1:
The battery management system automatically monitors temperature and adjusts charging parameters without external intervention. The system uses the battery's own operational characteristics to self-regulate the charging process, eliminating the need for separate heating equipment while maintaining charging effectiveness.
Solution Approach 2:
The charging current and voltage parameters are dynamically adjusted based on real-time temperature monitoring. When low temperature is detected, the system modifies charging parameters to optimize charge acceptance, enabling full charging without additional heating infrastructure.
2Device complexity
If charging is performed at low battery temperature, then the system structure remains simple, but the state of charge decreases below target level
Solution Approach 1:
The battery management system implements continuous feedback monitoring of temperature and state of charge. Based on this feedback, the system dynamically adjusts charging parameters to ensure the battery reaches the target charge level, maintaining reliability without adding complex hardware.
Solution Approach 2:
The charging system transitions from static fixed-parameter charging to dynamic adaptive charging. The charging parameters are continuously adjusted based on real-time battery conditions, allowing the system to maintain simplicity while achieving reliable charging outcomes across varying temperatures.
3Ease of manufacture
If charging is performed at low battery temperature, then no additional heating components are needed, but drive distance is reduced due to incomplete charging
Solution Approach 1:
The system changes charging parameters (current, voltage, timing) based on temperature conditions to maximize the amount of charge that can be effectively stored in the battery. This ensures sufficient charge capacity for required drive distance without adding heating components.
Solution Approach 2:
The battery management system performs preliminary temperature assessment before initiating charging and pre-adjusts charging parameters accordingly. This preliminary adaptation ensures optimal charging efficiency from the start, achieving full charge capability without subsequent heating intervention.
Data Source
AI summary
A system for charging a battery is provided. The system includes a high voltage battery that supplies electrical energy necessary to assist in a motor during acceleration of a vehicle and stores electrical energy generated by a motor regeneration during declaration of the vehicle or occurrence of a margin output of an engine. An on board charger receive AC power from a power supply which is supplied from the outside and supplies power for charging the high voltage battery. A battery management system transmits and receives charging and discharging information regarding the high voltage battery to and from the power supply through the on board charger using controller area network (CAN) communication.