Battery Characteristics Learning Apparatus for Accurate Circuit Constant Calculation
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Solution Overview
Problem
Existing methods for calculating the circuit constants of a rechargeable battery's equivalent circuit fail to accurately determine all constants, especially those defining large or small time constants, due to the lack of consideration for time constants in the calculation process.
Innovation Solution
A battery characteristics learning apparatus that acquires and stores terminal voltage and current values in time series, determines changes in current, and calculates circuit constants at specific sampling time points and periods aligned with the corresponding time constants, ensuring accurate calculation of all circuit constants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If circuit constants are calculated based on terminal voltage and current values acquired without considering time constants, then the calculation process is simple, but circuit constants defining large time constants cannot be accurately calculated when values are acquired immediately after current change
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing time constant values for each circuit constant before the actual measurement process. These pre-computed time constants are then used to determine appropriate sampling timing, ensuring that measurements are taken at optimal moments when the battery response is most sensitive to each specific circuit constant, thereby resolving the contradiction between simple calculation and accurate measurement.
Solution Approach 2:
The patent implements dynamics by adapting the sampling timing dynamically based on the calculated time constants. Instead of using fixed sampling intervals, the system adjusts sampling moments according to the specific time constant characteristics of each circuit constant, allowing the measurement process to synchronize with the battery's natural response characteristics and achieve accurate measurement of all circuit constants.
2Measurement precision
If circuit constants are calculated based on terminal voltage and current values acquired after a long time from current change, then circuit constants defining large time constant can be accurately calculated, but circuit constants defining small time constant cannot be accurately calculated
Solution Approach 1:
The patent applies segmentation by dividing the measurement process into multiple independent phases, each dedicated to measuring specific circuit constants. By segmenting the measurement task according to the different time constant characteristics of each circuit constant, the system can measure small time constant constants early in the response period and large time constant constants later, without requiring a single prolonged measurement period for all constants.
Solution Approach 2:
The patent uses preliminary action by pre-calculating time constants and planning the measurement sequence in advance. This allows the system to schedule measurements of different circuit constants at their respective optimal timing moments, avoiding the need to wait for all constants to stabilize and thereby reducing overall measurement time while maintaining accuracy.
3Measurement precision
If sampling is performed at multiple time points aligned with time constants, then all circuit constants can be accurately calculated, but the complexity of determining sampling timing increases
Solution Approach 1:
The patent resolves the complexity issue through preliminary action by pre-calculating all time constant values and storing them in a database before the actual measurement process. This advance preparation transforms the complex real-time timing determination problem into a simple lookup process during measurement, where the system only needs to retrieve pre-computed time constant values and schedule sampling accordingly, significantly reducing operational complexity.
Solution Approach 2:
The patent implements feedback by using the calculated time constants to guide the sampling timing decisions. The system continuously monitors the battery response and compares it against the expected time constant characteristics, adjusting sampling moments accordingly. This feedback mechanism ensures accurate measurement of all circuit constants while maintaining manageable complexity through automated timing control.
Data Source
AI summary
A battery characteristics learning apparatus is provided for calculating learning values of circuit constants of an equivalent circuit of a rechargeable battery. The apparatus includes: (1) means for acquiring values of terminal voltage of the battery sensed by voltage-sensing means and values of current of the battery sensed by current-sensing means and storing the acquired values in time series; (2) means for determining, based on the acquired values of the current, whether there has occurred a predetermined change in the current; and (3) means for calculating, when it is determined that the predetermined change has occurred, the learning values of the circuit constants based on those values of the terminal voltage and the current which are acquired at sampling time points or during sampling periods, each of the sampling time points and the sampling periods being set according to a corresponding one of time constants defined by the circuit constants.