Battery Initial Condition Estimation via Stabilizing Time
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Solution Overview
Problem
Existing battery state of charge (SOC) estimation methods, such as the coulomb counting and resistance measurement methods, fail to accurately reflect the electrochemical characteristics of batteries after stabilization, and voltage measurement methods lack internal state information, leading to estimation errors.
Innovation Solution
An apparatus and method that calculate the stabilizing time of lithium ion concentration in a battery, selecting an appropriate estimation model based on this time, and estimating the initial battery condition using an electrochemical model or open circuit voltage (OCV) estimation method, or a combination of both, to accurately charge the battery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If voltage measurement method is used to estimate battery SOC, then the estimation process is simple, but estimation error occurs due to lack of internal state information
Solution Approach 1:
The patent combines voltage measurement method with electrochemical model to create a hybrid estimation approach. The voltage measurement provides simple external data while the electrochemical model incorporates internal state information (Li ion concentration, diffusion coefficients), merging the advantages of both methods to achieve accurate SOC estimation without sacrificing operational simplicity
Solution Approach 2:
The electrochemical model acts as an intermediary that translates simple voltage measurements into accurate SOC estimates by incorporating internal battery state information. The model serves as a mediator between the external voltage measurement and the internal battery state, resolving the contradiction by adding computational processing that enriches the simple voltage data with electrochemical insights
2Ease of manufacture
If coulomb counting method is used to estimate battery SOC, then the method is easy to implement, but it does not reflect electrochemical characteristics after battery operation termination
Solution Approach 1:
The patent changes the parameters used in SOC estimation by incorporating time-dependent electrochemical parameters (diffusion coefficients, Li ion concentration) that evolve after battery operation termination. Instead of relying solely on cumulative charge/discharge data, the method updates estimation parameters based on the battery's electrochemical state, improving reliability while maintaining implementation feasibility through standardized measurement protocols
3Ease of operation
If resistance measurement method is used to estimate battery state, then the measurement is straightforward, but it fails to capture electrochemical characteristics after operation termination
Solution Approach 1:
The patent merges resistance measurement with electrochemical modeling, combining the straightforward external measurement capability with internal state information from diffusion coefficients and Li ion concentration. This hybrid approach maintains the ease of resistance measurement while enhancing accuracy through electrochemical parameter integration
Solution Approach 2:
The electrochemical model serves as an intermediary that enhances straightforward resistance measurements by incorporating internal battery state information. The model translates simple resistance data into accurate battery state estimates by considering diffusion processes and concentration gradients that occur after operation termination
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 approach minimizes estimation errors by selecting the appropriate model based on the battery's state, ensuring accurate SOC and lithium ion concentration estimation, even after battery stabilization, thereby enhancing battery charging efficiency.
Implementation Method 1
calculating a stabilizing time based on any one or any combination of two or more of a diffusion coefficient of Li ions in a anode, a diffusion coefficient of the Li ions in the electrolyte, a particle size of the electrode, a thickness of the electrode
Data Source
AI summary
An apparatus for estimating an initial condition of a battery includes a processor configured to calculate a stabilizing time of a lithium (Li) ion concentration in the battery, select an estimation model based on the stabilizing time, and estimate the initial condition of the battery to charge the battery using the selected estimation model.