Battery Voltage Adjusting Device with Temperature-Dependent Waiting Time
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Solution Overview
Problem
Existing battery voltage equalization methods for high voltage batteries in hybrid electric vehicles do not adequately account for the waiting time required to achieve stable voltage across varying temperatures, leading to prolonged equalization times, increased dark current, and incorrect voltage detection.
Innovation Solution
A battery voltage adjusting device that includes voltage detecting, charge-discharge, and temperature detecting means, with a changing mechanism to adjust the waiting time for stable voltage detection based on unit cell temperature and charge/discharge capacity, ensuring optimal equalization timing across different temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a uniform waiting time for stable voltage is set based on the lowest temperature, then voltage stability is ensured at low temperatures, but the equalization time becomes excessively long at high temperatures and dark current increases
Solution Approach 1:
The patent applies dynamics by making the waiting time variable rather than fixed. The control device dynamically adjusts the waiting time based on real-time temperature measurements of the battery. When temperature is high, the waiting time is shortened; when temperature is low, the waiting time is extended. This dynamic adjustment resolves the contradiction between ensuring voltage stability at low temperatures and reducing equalization time at high temperatures.
Solution Approach 2:
The patent changes the parameter of waiting time based on temperature conditions. By establishing a relationship between temperature and appropriate waiting time, the system optimizes the equalization process for different thermal states. This parameter change approach allows the system to adapt to varying temperatures, preventing both excessive waiting times and insufficient voltage stabilization.
2Productivity
If voltage detection is performed immediately after charge/discharge without adequate waiting time, then equalization speed increases, but voltage detection accuracy decreases due to unstable voltage
Solution Approach 1:
The system dynamically determines the detection timing based on temperature. The control device calculates an appropriate waiting time based on the measured temperature and performs voltage detection at that optimized moment. This dynamic timing adjustment ensures voltage stability for accurate detection while avoiding excessive delays that would reduce equalization speed.
Solution Approach 2:
The system performs preliminary temperature measurement and calculates the optimal waiting time before voltage detection. By preparing the appropriate detection timing in advance based on temperature conditions, the system ensures that voltage detection occurs at the optimal moment when voltage is stable but equalization is not excessively delayed.
3Measurement precision
If the waiting time for stable voltage detection is extended to ensure accuracy, then voltage detection precision improves, but the overall equalization process time increases
Solution Approach 1:
The patent changes the waiting time parameter based on temperature conditions rather than using a fixed extended waiting time. At high temperatures, the waiting time is shortened since voltage stabilizes quickly; at low temperatures, the waiting time is extended to ensure stability. This conditional parameter adjustment maintains detection precision while minimizing overall process time.
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 solution allows for precise determination of waiting time for stable voltage detection, reducing dark current and ensuring accurate equalization by adapting to various temperatures, thereby improving the efficiency and accuracy of battery voltage equalization.
Implementation Method 1
a voltage detecting means, which is provided corresponding to a block including at least one unit cell of an on-vehicle high voltage battery consisting of a plurality of the unit cells connected in series and detects a terminal voltage of the unit cell in the block
Implementation Method 2
a charge-discharge means, which charges or discharges the unit cell in the block on the basis of the terminal voltage of the unit cell detected by the voltage detecting means
Implementation Method 3
a temperature detecting means, which detects a temperature of the unit cell
Implementation Method 4
When the discharge is stopped, an electrochemical component of an internal resistance component remains as a voltage and the terminal voltage recovers with a time lag. That is, the terminal voltage of the battery does not immediately become an OCV after the discharge is stopped, but gradually approaches the OCV with a time lag.
Data Source
AI summary
The battery voltage adjusting device includes: a voltage detecting means provided corresponding to a block including at least one unit cell of an on-vehicle high voltage battery consisting of a plurality of the unit cells connected in series and detecting a terminal voltage of the unit cell in the block; a charge-discharge means charging or discharging the unit cell in the block on the basis of the terminal voltage of the unit cell detected by the voltage detecting means; a temperature detecting means detecting a temperature of the unit cell; and a changing means changing a time period, from a time point when the charge-discharge means finishes to charge or discharge the unit cell to a time point when the voltage detecting means detects the terminal voltage of the unit cell, on the basis of the temperature of the unit cell detected by the temperature detecting means.