EV Battery Power Management for In-Drive SOC Retention
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Solution Overview
Problem
Electric vehicles face challenges in maintaining the state of charge (SOC) of their main batteries when charging with the energy of a swap battery while in operation, as the SOC tends to decrease due to uneven charge and discharge power levels, leading to reduced driving distance and increased charging time.
Innovation Solution
A power management method that includes monitoring and determining charge and discharge powers of the main battery during charging, limiting the maximum discharge power when charge power is smaller than discharge power, and maintaining it when charge power is larger, using a charge/discharge management controller to prevent SOC decrease.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the main battery is charged with the energy of the swap battery according to the output level of the main battery occurring when the vehicle is driving, then the charging can be performed while the vehicle is driving, but the SOC of the main battery is not increased
Solution Approach 1:
The patent applies dynamics by making the discharge power of the main battery adjustable and controllable during charging. The controller dynamically adjusts the discharge power limit based on the charge power from the swap battery, allowing the system to adapt to varying charging conditions and ensure net energy gain for the main battery.
Solution Approach 2:
The patent implements feedback control by continuously monitoring the charge power from the swap battery and using this information to determine an appropriate discharge power limit for the main battery. The controller adjusts the discharge power based on the relationship between charge and discharge powers, ensuring that the main battery's SOC increases during the charging process.
2Power
If the maximum discharge power of the main battery is not limited during charging with swap battery, then the vehicle can maintain driving power, but the SOC of the main battery decreases
Solution Approach 1:
The patent applies parameter changes by modifying the discharge power parameter of the main battery during charging. The controller changes the discharge power limit from its maximum value to a controlled value that is lower than the charge power, ensuring that the main battery accumulates energy while still providing sufficient power for vehicle operation.
3Length of moving object
If battery capacity is increased to extend driving distance, then the maximum driving distance increases, but the weight and price of the electric vehicle increase significantly
Solution Approach 1:
The patent applies segmentation by dividing the battery system into two separate batteries: a main battery for sustained energy storage and a swap battery for supplemental charging. This segmentation allows the vehicle to achieve extended driving distance without requiring a single large-capacity battery, thereby avoiding the weight and cost penalties associated with increasing main battery capacity.
Solution Approach 2:
The swap battery acts as an intermediary that provides additional energy to the main battery during vehicle operation. Instead of directly increasing the main battery capacity, the swap battery mediates the energy supply by charging the main battery while the vehicle is driving, effectively extending range without adding weight to the primary energy storage system.
4Length of moving object
If battery capacity is increased to extend driving distance, then the maximum driving distance increases, but the charging time increases significantly
Solution Approach 1:
The patent applies segmentation by dividing the battery system into two separate batteries: a main battery for sustained energy storage and a swap battery for supplemental charging. This segmentation allows the vehicle to achieve extended driving distance without requiring a single large-capacity battery, thereby avoiding the weight and cost penalties associated with increasing main battery capacity.
Solution Approach 2:
The patent implements continuity of useful action by enabling the main battery to be charged during vehicle operation through the swap battery. This continuous charging process eliminates idle charging time, as the battery charging occurs concurrently with vehicle usage, thereby extending driving distance without proportionally increasing charging time loss.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method effectively prevents the decrease of the main battery's SOC during charging with a swap battery, ensuring stable energy levels and extended driving distance without the need for extensive infrastructure or battery replacement.
Implementation Method 1
performing charging of a main battery through discharging of a swap battery
Data Source
AI summary
A power management method of an electronic vehicle includes performing charging of a main battery through discharging of a swap battery, determining charge and discharge powers of the main battery during the charging of the main battery, and limiting a maximum discharge power of the main battery when the charge power is smaller than the discharge power.