Strategies for Fast Charging of EV Batteries

High-efficiency charging control device for electric vehicles that reduces charging time and improves battery life by allowing variable current charging closer to constant power charging. The device uses a charging pile with a current collection resistor and switch connected to the vehicle's battery management system via the charging interface. This allows real-time adjustment of the charging current based on battery state.

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A method for charging an electric vehicle battery using a charging station that provides a higher initial charging rate followed by a lower rate. The charging station has an electronic controller. The method involves using the controller to provide a first charging mode where the battery is charged at maximum rate from the station and/or the battery itself. This is followed by a second charging mode with lower rate than maximum. This two-step charging allows faster initial charge to a useful level, then slower charge to finish without overloading the battery.

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Charging control system for electric vehicles that allows charging stations to actively manage the charging process and adapt it based on the vehicle's needs. The system enables chargers to modify the charging current and power during constant current or constant power charging modes based on commands from the vehicle. This allows chargers to optimize charging efficiency and performance by adjusting the charging profile to account for factors like battery state, environmental conditions, and travel distance remaining.

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Electric vehicle charging system that allows fast charging while minimizing battery degradation. The system uses optimized charging protocols based on battery condition to balance fast charging speed with battery life. It analyzes battery state during charging to determine degradation level. Then it adjusts charging parameters like current, duty cycle, and frequency for that battery to delay degradation while still allowing fast charging.

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A charge control device for electric vehicles that aims to reduce battery charging time by mitigating power loss when the vehicle is in use. The device monitors the difference between the power supplied by the charger and the power actually going into the battery due to other vehicle electronics. When this difference occurs, the charge controller increases the supply power to compensate and prevent a drop in battery charge rate. This prevents the battery from receiving less charge than intended when the vehicle is being driven, thus avoiding unnecessary extension of charging times.

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Automatic charging current control when battery charging is abnormally terminated in an eco-friendly vehicle. The system uses the vehicle's onboard charger to request a charging current from the power supply. When charging is abruptly halted before completion, the charger adjusts the requested current based on information from the power supply upon termination and completion. This prevents failed charges due to low current availability and reduces charge time compared to manual adjustment.

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Electric vehicle (EV) rapid charging system that extends the life of the charger's power modules by intelligently switching between DC and AC charging. The charger has separate DC and AC ports, and initially charges the EV battery quickly using DC. When the battery charge level reaches 80% and the charging speed drops below a threshold, the charger switches to AC charging to complete the charge. This reduces the amount of time the power modules are operating at reduced speeds, extending their lifespan.

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Battery charging method that optimizes charging speed and battery life by dynamically switching between heating pulses and regular charging based on pack temperature. The method involves applying alternating positive and negative pulses with a specific frequency to heat the battery pack when it's below a reference temperature. This helps raise pack temperature for faster charging. Once the pack reaches the reference temperature, regular charging current is applied.

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Optimizing battery charging time for devices like electric vehicles by dynamically adjusting the charging current during the charging process based on battery state and temperature. The method involves initially determining a maximum safe charging current based on the battery's charge level and temperature. Then, the charging current is stepped down in a series of decrements while monitoring the battery voltage. If the voltage rises, the current is increased back to the previous level. This iterative process allows finding the optimal charging current for the battery's condition.

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A liquid cooled charging cable for electric vehicle charging stations that allows higher power charging than air cooled cables without becoming too large and heavy. The cable contains a coolant that is pumped around the conductors to cool them and prevent overheating at high charging currents.

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Efficiently controlling the temperature of an electric vehicle battery to improve charging efficiency by determining the optimal charging temperature based on vehicle driving conditions and battery charge status, and then adjusting the battery temperature to that optimal level before charging.

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A charging system for vehicles that adapts the charging current based on the battery state and charging mode to improve efficiency. The system determines a charging reference current based on the charging mode (e.g., full charge vs recharge) and calculates the charging power. This allows using different currents for optimal charging depending on factors like battery charge level. The charger then outputs the calculated current to charge the battery. This provides better charging versus using a fixed current for all modes.

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Charging electric vehicle batteries in an optimal way based on their state of charge. The charging process involves receiving battery charge rate information from the vehicle's onboard computer, deciding whether to use constant current or constant voltage charging based on the rate, and monitoring charge progress. This allows more efficient and safer battery charging by tailoring the charging method to the current charge level.

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Battery charging method and system that enables faster charging without compromising safety. The method involves charging a battery according to a strategy table and periodically performing impedance measurements during charging to detect lithium plating. If plating is detected, the charging current is reduced for subsequent charge cycles. This prevents plating without over-conservatively limiting charging.

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Charging and discharging device for electric vehicles that improves battery charging and discharging efficiency. It uses two DC/DC converters and an energy storage unit in addition to an AC/DC converter. The device selectively uses the energy storage unit to charge the battery when possible. It monitors bus voltage and balance to determine when to engage the AC/DC converter. This balances the charge sources and prevents over/undercharging.

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Battery conditioning for electric vehicles that provides battery state information associated with charging performance. The conditioning enables a driver to control and manage battery temperature before charging to reach an optimal level. This improves charging speed and capacity compared to unconditioned charging. The conditioning method involves obtaining battery temperature vs charging time data, using that to determine an appropriate charging time given the current battery temperature, then displaying a charging performance level (excellent, good, poor) based on the actual charging time compared to optimal.

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A prismatic battery cell design that enables fast charging with reduced heat development and efficient packing in a rectangular battery pack. The cell has a rectangular conductive casing containing stacked layers of cathode, anode, and separator. One set of cathode and anode tabs run along the bottom width and connect to the casing for one terminal. The other set of tabs run along the top width and connect to a terminal that projects through the cover.

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Fuel cell system for vehicles that reduces secondary battery charging time after ignition off. It calculates the energy needed from the battery until the fuel cell starts again, and sets the target battery state of charge (SOC) accordingly. This prevents overcharging the battery. It also varies the target SOC based on fuel cell system temperature, switching to a higher target if the system is hot.

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Fast charging battery system with multi-stage voltage conversion to charge batteries faster with minimized heat dissipation compared to conventional chargers. The charging involves a sequence of voltage conversion cycles to generate a charging pulse with high current for fast charging. Each conversion cycle starts with getting input voltage from the power source, generating intermediate voltages, and converting them into portions of the charging pulse using secondary converters. This allows stepping down voltage while increasing current to charge the battery faster with reduced power loss.

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System and method to optimize battery charging of electric vehicles (EVs) while avoiding component damage. The charging system monitors factors like battery temperature and charge level during charging and adjusts parameters like voltage and current to optimize charging speed. This prevents overcharging, overheating, and other issues that can degrade battery health or damage the charging system. By dynamically adapting charging conditions based on real-time battery data, it allows faster, more efficient charging without compromising reliability.

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