Battery Charge Protocol Inspection Using Internal Resistance
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Solution Overview
Problem
Existing methods for configuring charge protocols for battery cells, particularly during the conversion from monocell to large cell, often overlook factors like internal resistance and heat emission, which can affect fast charging performance and battery life.
Innovation Solution
A charge protocol inspection apparatus and method that calculates internal resistance of battery cells based on charge protocol information, open circuit voltage, and reference internal resistance, allowing for the determination of suitable charge protocols by comparing calculated and reference resistances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a charge protocol is configured based on monocell type batteries, then the charge protocol can be derived for large cells, but factors such as internal resistance and heat emission during fast charge are not considered
Solution Approach 1:
The patent uses monocell type battery data as a template or copy to derive charge protocols for large cells. By measuring internal resistance at different states of charge for the monocell type and copying this methodology to large cells, the system efficiently configures charge protocols without needing to manufacture additional three-electrode monocell batteries for each large cell type.
Solution Approach 2:
The patent changes the parameter being measured from general voltage-current characteristics to specifically internal resistance at different states of charge. By focusing on internal resistance as the key parameter and how it varies with state of charge, the system can accurately assess charge protocol suitability while accounting for factors like heat emission that were previously overlooked.
2Speed
If fast charge is implemented without considering internal resistance, then charging speed is improved, but battery life and safety are compromised
Solution Approach 1:
The patent performs preliminary measurement of internal resistance at different states of charge before finalizing the charge protocol. By提前 (in advance) characterizing the internal resistance behavior of the battery across its charge range, the system can pre-determine safe and optimal charge protocols that maintain fast charging speed while protecting battery life and safety.
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
Enables the calculation of internal resistance for each charge protocol, determining protocol suitability and extending battery life by analyzing resistance changes, without the need to manufacture three electrodes of a monocell type.
Implementation Method 1
a battery cell, an open circuit voltage (OCV) corresponding to a state of charge (SoC) of the battery cell
Implementation Method 2
calculate an internal resistance of the battery cell during charge based on the information about the charge protocol and the OCV corresponding to the SoC of the battery cell
Data Source
AI summary
A charge protocol inspection apparatus including an information obtaining unit is configured to obtain information about a charge protocol of a battery cell, an open circuit voltage (OCV) corresponding to a state of charge (SoC) of the battery cell, and a reference internal resistance of the battery cell, calculate an internal resistance of the battery cell during charge based on the information about the charge protocol and the OCV corresponding to the SoC of the battery cell, and compare the reference internal resistance of the battery cell with the internal resistance of the battery cell during charge.