Battery Cell Voltage Control for Safe Energy Storage
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Solution Overview
Problem
Lithium-ion battery cells face overheating and potential explosion risks when charging voltage exceeds safe limits, leading to accelerated aging and energy loss due to inefficient energy storage during recuperation in vehicles.
Innovation Solution
A method for operating rechargeable battery cells that involves measuring and comparing voltages with specific limit voltages to prevent overcharging, allowing for short-term overcharging during recuperation while ensuring safety by discontinuing charging above a predefined voltage and discharging below a nominal voltage, and utilizing a battery control device to implement this method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the battery cell is charged to maximize energy storage during recuperation, then energy efficiency is improved, but the battery cell may overheat and accelerate aging or even explode
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the charging voltage limit based on the battery's state of charge. When the battery voltage is below the first limit voltage, charging is permitted; when it exceeds the first limit voltage, charging is discontinued. This dynamic parameter adjustment allows efficient energy storage during recuperation while preventing overheating and safety risks.
2Use of energy by moving object
If the battery cell charges continuously during recuperation, then energy storage is improved, but battery aging accelerates and lifespan decreases
Solution Approach 1:
The patent implements feedback control by continuously monitoring the battery voltage during charging and comparing it against predefined limit voltages. When the voltage reaches the first limit voltage, the system provides feedback to discontinue charging, preventing excessive charging that would accelerate aging. This feedback mechanism enables continuous energy storage during recuperation while preserving battery lifespan.
3Reliability
If the battery cell voltage is maintained at nominal levels, then safety is improved, but energy storage efficiency during recuperation decreases
Solution Approach 1:
The patent applies segmentation by dividing the voltage control into two distinct limit voltages: a first limit voltage for charging discontinuation and a second limit voltage for discharge initiation. This segmentation allows the battery to operate safely within defined voltage ranges while maximizing energy storage efficiency during recuperation by permitting charging up to the first limit voltage without continuously maintaining nominal levels.
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 method effectively prevents overheating and prolongs battery life by allowing efficient energy storage during short-term overcharging, minimizing energy loss and maintaining safety by adhering to defined voltage limits, thus optimizing energy usage in vehicles without accelerating battery aging.
Implementation Method 1
Batteries convert chemical reaction energy into electric energy
Implementation Method 2
The electrolyte is conductive for the lithium ions and enables the transport of the lithium ions between the electrodes
Data Source
AI summary
The invention relates to a method for operating a rechargeable battery cell: wherein —a first measurement (101) of a first voltage of the battery cell is carried out, —a first comparison (102) of the first voltage with a first limit voltage is carried out, —a charging process (104) of the battery cell is carried out if the first voltage is less than the first limit voltage, —a second measurement (106) of a second voltage of the battery cell is carried out, —a second comparison (107) of the second voltage with a second limit voltage is carried out, —a discharge process (109) of the battery cell is carried out if the second voltage is greater than the second limit voltage, wherein the first limit voltage is greater than the second limit voltage. The invention also relates to a battery control device which is equipped to carry out the method according to the invention.