Battery Charging Time Prediction with SoC-Based Correction Factors
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Solution Overview
Problem
Existing methods for determining the remaining charging time of a battery system do not accurately account for variable conditions such as state of charge, temperature, and aging, leading to inaccurate estimates.
Innovation Solution
A method that calculates the remaining charging time by forming a quotient from the delta capacity and the product of the battery charging current and a factor dependent on the state of charge, with additional considerations for cooling time and aging effects, using characteristic curves or maps to determine these factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the remaining charging time is determined using only the current charging current and battery capacity, then the calculation is simple, but the accuracy of the remaining charging time determination is poor
Solution Approach 1:
The patent introduces a state-of-charge-dependent factor that modifies the basic charging time calculation. This factor changes based on the battery's state of charge, allowing the calculation to adapt to different charging stages and improve accuracy without requiring completely new measurement systems.
Solution Approach 2:
The patent uses characteristic curves as an intermediary element between the raw charging parameters and the final remaining time calculation. These curves pre-process the relationship between state of charge and charging efficiency, allowing the system to achieve high accuracy through a relatively simple calculation that references pre-computed data.
2Productivity
If the charging current is kept constant to simplify control, then the control system is simple, but the battery may overheat and the charging efficiency decreases at high state of charge
Solution Approach 1:
The patent implements dynamic charging current adjustment by introducing a state-of-charge-dependent factor that modifies the charging current based on real-time battery conditions. This allows the system to optimize charging efficiency at lower states of charge while reducing current at higher states to prevent overheating, creating a dynamically adapted charging process.
Solution Approach 2:
The charging system uses feedback from the state of charge measurement to continuously adjust the charging current. The characteristic curves provide a feedback mechanism that automatically reduces the charging current as the battery approaches full charge, preventing overheating while maximizing charging efficiency during the process.
Data Source
Figure 1~2
AI summary
The invention relates to a method for determining the remaining charging time of a battery system (10) with at least one battery module (20), wherein the remaining charging time is determined from a first point in time of a charging process by forming a quotient of a delta capacity of the battery system (10) at the first point in time as the dividend and a first product of a battery charging current at the first point in time and a first factor as the divisor, wherein the first factor is determined as a function of a state of charge of the at least one battery module (20). The invention further relates to a battery system (10) with at least one battery module (20) and a processing unit (30), wherein the processing unit (30) is configured to carry out a method according to the invention.