Battery Short-Circuit Current Calculation via Dynamic SOC Tracking

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Solution Overview

Problem

Existing methods for calculating the short-circuit current of a battery are inaccurate when the battery is in a dynamic environment due to fluctuations in output power, making it difficult to obtain stable battery parameters like current, internal resistance, and temperature.

Innovation Solution

A method that calculates the short-circuit current by obtaining the integral and current state of charge, updating real state of charge based on a temperature-impedance table, and iteratively calculating the impedance and open-circuit voltage to improve accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If existing methods are used to calculate short-circuit current in static environment, then calculation is simple, but accuracy deteriorates when battery is in dynamic environment with fluctuating output power

Engineering Contradiction:

Improveshort-circuit current calculation accuracyVSAvoidcalculation method complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent transforms the static calculation method into a dynamic one by continuously tracking state of charge (SOC) changes over time. The system monitors SOC at different time points, calculates SOC variation rates, and uses these dynamic parameters to compute short-circuit current, thereby maintaining accuracy under fluctuating output power conditions.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent implements feedback by using the calculated short-circuit current and SOC variation rate to continuously update the calculation model. The system feeds back the dynamic battery state information into the calculation process, adjusting the short-circuit current estimation based on real-time SOC changes, which improves accuracy in dynamic environments.

Inventive Principle:

Principle #23Feedback

2Productivity

If battery parameters are measured in dynamic environment, then real-time monitoring is achieved, but parameter stability deteriorates

Engineering Contradiction:

Improvereal-time monitoring capabilityVSAvoidbattery parameter stability

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

The patent applies preliminary action by pre-establishing the relationship between SOC variation rate and short-circuit current based on battery characteristics. Before real-time dynamic monitoring, the system prepares the calculation model and necessary parameters, enabling stable and accurate short-circuit current estimation when dynamic monitoring begins, thus maintaining parameter stability while achieving real-time capability.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS11525862B2Methods, storage media, and electronic devices for calculating short-circuit current of battery

Publication Date: 2022.12.13 DONGGUAN NVT TECH

AI summary

A method for calculating a short-circuit current of a battery. includes: obtaining an integral state of charge and a current state of charge of the battery; calculating a first difference based on the integral state of charge and the current state of charge; calculating the short-circuit current of the battery based on the first difference; obtaining a first real state of charge and a second real state of charge; updating the first real state of charge and the second real state of charge based on a temperature-impedance table and the short-circuit current of the battery; calculating a second difference based on the updated first real state of charge and the updated second real state of charge; and updating the short-circuit current of the battery based on the second difference.