Dynamic Charging Power Control for Battery Reliability
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Solution Overview
Problem
Current power storage systems for electric vehicles lack effective control over charging and discharging power, which can lead to battery degradation and inefficient energy management.
Innovation Solution
A power storage system that includes a battery, a voltmeter, an ammeter, and processing circuitry to calculate and set charging and discharging power limits based on estimated open-circuit voltage and internal resistance, preventing excessive power from being supplied or discharged, thereby protecting the battery and optimizing its performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If charging power is increased to improve charging speed, then productivity is improved, but battery reliability deteriorates due to excessive power causing degradation
Solution Approach 1:
The charging power upper limit is dynamically adjusted based on the battery's state of charge. As the battery approaches full charge (voltage upper limit), the system automatically reduces the charging power upper limit to prevent overcharging and degradation, while allowing higher power when the battery has more capacity available
Solution Approach 2:
The system continuously monitors battery voltage and charge amount, using this feedback to adjust the charging power upper limit in real-time. The control unit calculates the appropriate power limit based on current battery state and adjusts charging power accordingly, creating a closed-loop control system that balances charging speed with battery protection
2Power
If discharging power is increased to improve power output, then power is improved, but battery reliability deteriorates due to excessive discharge power
Solution Approach 1:
The discharging power upper limit is dynamically adjusted based on the battery's charge amount and voltage. When the battery has sufficient charge, higher discharge power is permitted to meet power demands. As charge decreases or voltage drops, the system automatically reduces the discharge power upper limit to prevent overdischarge and maintain battery health
Solution Approach 2:
The control unit continuously monitors battery voltage and charge amount during discharge, using this feedback to adjust the discharging power upper limit in real-time. This closed-loop control ensures that high power output is maintained when safe, while preventing excessive discharge that would harm battery reliability
3Reliability
If fixed charging power limit is set to protect battery, then battery reliability is improved, but productivity deteriorates due to inability to charge at optimal power
Solution Approach 1:
Instead of using a fixed charging power limit, the system dynamically adjusts the charging power upper limit based on the battery's real-time state of charge and voltage. This allows the system to charge at maximum safe power when the battery can accept it, and gradually reduce power only when necessary to prevent overcharging, thereby optimizing both battery protection and charging efficiency
Solution Approach 2:
The system changes the charging power parameter dynamically based on battery state. By monitoring voltage and charge amount, the system adjusts the power limit parameter in real-time, transitioning from high power (when safe) to lower power (when approaching full charge), thus optimizing charging efficiency while maintaining battery reliability
Data Source
AI summary
A power storage system includes: a battery; a voltmeter configured to measure voltage of the battery; an ammeter configured to measure current of the battery; and processing circuitry configured to control charge of the battery to prevent charging power exceeding charging power upper limit from being supplied to the battery. The processing circuitry is further configured to: calculate first charging power, at which the battery reaches voltage upper limit, based on estimated open-circuit voltage, which is an estimated value of open-circuit voltage of the battery, and first estimated internal resistance; calculate second charging power, at which the battery reaches the voltage upper limit, based on the voltage, the current, and second estimated internal resistance; and set the charging power upper limit, based on the first charging power and the second charging power.