Cell Control Device for Selective Battery Balancing
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Solution Overview
Problem
Existing cell balancing techniques for lithium ion batteries result in high energy losses due to the operation of balancing circuits on cells with unchanged state of charge (SOC), leading to inefficient charging and discharging and reduced battery life.
Innovation Solution
A cell control device with discharge and charging circuits, voltage detection, and high-frequency electromagnetic radiation to selectively discharge and charge unit cells based on their SOC, optimizing the balancing process to reduce energy losses and extend battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cell balancing circuits operate on all unit cells during charging and discharging, then SOC equalization is achieved, but energy losses increase due to unnecessary discharge current on cells with unchanged SOC
Solution Approach 1:
The patent applies local quality by enabling different operational modes for different unit cells based on their individual SOC characteristics. Cells with significant SOC deviation are subjected to balancing discharge, while cells with SOC within acceptable ranges continue normal charging without balancing intervention, optimizing energy utilization.
Solution Approach 2:
The patent implements dynamic control by adjusting the balancing discharge current based on real-time SOC measurements and cell states. The control unit dynamically determines which cells require balancing and adjusts discharge current magnitude, allowing the system to adapt to changing battery conditions and minimize energy losses.
2Reliability
If balancing discharge current is applied to all unit cells, then SOC variation is reduced, but charging efficiency decreases due to reduced charge current on cells that do not need balancing
Solution Approach 1:
The patent applies local quality by enabling different operational modes for different unit cells based on their individual SOC characteristics. Cells with significant SOC deviation are subjected to balancing discharge, while cells with SOC within acceptable ranges continue normal charging without balancing intervention, optimizing energy utilization.
Solution Approach 2:
The patent implements partial action by applying balancing discharge current only to the subset of unit cells that require SOC equalization, rather than uniformly applying it to all cells. This selective approach maintains charging efficiency for cells that do not need balancing while still achieving SOC variation control.
3Measurement precision
If high frequency electromagnetic radiation is applied to voltage detection lines, then voltage detection accuracy is improved, but device complexity increases due to oscillator and control circuitry
Solution Approach 1:
The patent applies the principle of vibration by using high-frequency electromagnetic radiation (oscillation) on the voltage detection lines. This vibration-based approach enhances signal integrity and detection accuracy by filtering out low-frequency noise and interference, allowing for more precise voltage measurements.
Solution Approach 2:
The patent uses an intermediary approach by introducing an oscillator and control unit that modulate the voltage detection lines with high-frequency signals. This intermediary mechanism enables accurate voltage detection while isolating the detection system from electrical noise and interference present in the battery environment.
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 solution effectively reduces energy losses and prolongs the life of the battery by selectively managing the charging and discharging of unit cells, ensuring more efficient SOC balancing and utilization.
Implementation Method 1
an oscillator that irradiates high frequency electromagnetic radiation upon the voltage detection lines
Data Source
AI summary
A cell control device according to the present invention includes: a discharge circuit that discharges each unit cell selected by the first switches among a plurality of unit cells connected in series; a charging circuit that charges each unit cell selected by the second switches among the unit cells connected in series, and; a voltage detection unit that detects a voltage of each unit cell via voltage detection lines respectively connected to positive and negative electrodes of the unit cells; an oscillator that irradiates high frequency electromagnetic radiation upon the voltage detection lines; and a charging control unit that controls switching of the first switches, thereby performing discharge of the each unit cell, and a charging control unit that controls switching of the second switches, thereby performing charging of the unit cells, based on voltages of the unit cells that are detected by the voltage detection unit.