Mobility Battery Charging Voltage Control for Rated Voltage Detection
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Solution Overview
Problem
The challenge lies in accurately determining the rated voltage of various mobility batteries to prevent overcharging, as different types of mobility batteries have similar voltage measurements based on temperature, lifespan, and state of charge, leading to potential battery explosions and fires when using a common charger.
Innovation Solution
An apparatus and method that utilize a sensor to measure battery voltage and a controller to determine the rated voltage by setting threshold values based on voltage changes, preventing overcharging by setting a charging voltage corresponding to the determined rated voltage, and accounting for variations due to temperature, lifespan, and charge amount.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a common charger is used to charge various types of mobility batteries, then user convenience and charging accessibility are improved, but the risk of incorrect voltage determination and overcharging increases
Solution Approach 1:
The system applies parameter changes by introducing multiple measurement parameters (voltage at different states of charge, temperature compensation factors, lifespan correction coefficients) to accurately determine battery rated voltage. Instead of relying on a single voltage measurement, the controller measures voltage at multiple SOC levels and uses these changing parameters to identify the battery type and set appropriate charging voltage, thereby resolving the contradiction between universal charging convenience and charging safety.
2Adaptability or versatility
If battery voltage is measured to determine rated voltage, then charging of various mobility types is enabled, but measurement precision is insufficient due to overlapping voltage ranges
Solution Approach 1:
The system transitions from one-dimensional voltage measurement to multi-dimensional measurement by incorporating temperature, battery lifespan, and multiple voltage measurements at different SOC levels. This dimensional expansion allows the system to distinguish between batteries with overlapping voltage ranges by considering additional parameters, thereby improving both adaptability and measurement precision simultaneously.
Solution Approach 2:
The controller implements feedback by measuring battery voltage at multiple SOC levels (discharged state, intermediate state, charged state) and using these feedback measurements to iteratively determine the battery's rated voltage. The system compares measured voltages against reference values and adjusts its determination accordingly, enabling accurate battery identification even when voltage ranges overlap between different mobility types.
3Reliability
If threshold values are set for voltage determination, then overcharging prevention is improved, but device complexity increases due to multiple measurement and comparison operations
Solution Approach 1:
The system applies preliminary action by pre-storing reference voltage values and threshold parameters in the controller's memory for different battery types and SOC levels. Instead of performing complex real-time calculations, the controller compares measured voltages against these pre-established reference values and thresholds, thereby achieving reliable overcharging prevention while minimizing control system complexity through lookup-based decision-making.
Data Source
AI summary
An embodiment apparatus for controlling charging of a mobility includes a sensor configured to measure a battery voltage of a battery of the mobility to which a reference current is input and a controller configured to determine a rated voltage of the battery according to whether an amount of change in the battery voltage exceeds a reference value and to set a charging voltage corresponding to the rated voltage based on a determination that the battery voltage exceeds a first threshold value and is less than a second threshold value.