Optimizing EV Battery Charging to Minimize Aging Effects

Battery charging method to improve battery life by reducing expansion force during charging. The method involves adjusting the charge rate when the battery's state of charge (SOC) reaches a certain range where expansion force is maximized. The charge rate is lowered when SOC is close to the range to reduce expansion force and prolong battery life. When SOC exceeds the range, the charge rate is raised to ensure efficiency. This optimizes charging near the expansion limit to extend battery cycle life.

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Optimizing the charging of electric vehicle batteries to extend battery life and improve efficiency by intelligently controlling the charging process based on factors like anticipated driving distance, battery temperature, battery health, and more. The vehicle determines a target state of charge (SOC) less than 100% based on expected driving needs before the next charge. Charging the battery to a lower optimized SOC reduces degradation compared to always charging to 100%.

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Optimizing battery charging by dynamically adjusting the charging profile based on the battery's characteristics. The method involves determining battery characteristics and deriving weight information based on those characteristics. This weight information is then used to modify a basic charging profile to create a customized charging profile optimized for that specific battery.

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Battery charging system that adjusts the charging current based on the battery's health state of charge. The system includes a controller that stores an initial charging current magnitude. The controller reduces this magnitude based on the battery's state of health (SOH) to generate the charging current command. This prevents overloading a deteriorated battery with excessive current.

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Intelligent charging management for electric vehicle batteries that limits charging to less than full capacity based on the anticipated driving distance before the next recharge. The system estimates battery temperature during the upcoming drive, calculates the energy needed for that distance, factors in the impact on battery health and efficiency, and sets a target charge level. This avoids unnecessary full charging which can degrade battery life. The charge target is communicated to the vehicle charger to stop at that SOC.

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Charging lithium-ion batteries in a way that minimizes their deterioration and maximizes their lifespan. The technique involves controlling the charging current based on the battery's state of charge (SOC). The current is set higher when the SOC is in a medium range where the graphite negative electrode expansion is lowest. This avoids pushing out electrolyte and causing uneven lithium concentration that leads to high-rate degradation.

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Battery pack with a detector to identify improper charging methods like quick charging with non-designated chargers. The detector compares the current and voltage waveforms during charging to expected values. If the waveform exceeds a threshold, it indicates improper charging. This allows detecting if the battery pack has been charged in a way that may damage it. This can be used to warn users against charging practices that could shorten battery life.

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Charge/discharge control method for a battery that enables efficient battery control without exceeding temperature limits. The method involves estimating battery internal temperature based on intake air temperature and current load. Then, a control map that limits charge/discharge based on battery temperature is corrected using the estimated internal temperature. This allows preventing overheating while avoiding unnecessary charge/discharge restrictions. The correction uses a time constant to estimate internal temperature after a delay, rather than waiting for convergence.

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Smart charging system for electric vehicles to improve wireless charging efficiency. The system uses a controller to optimize charging by monitoring and selectively charging individual battery cells in a specific order based on their state of charge. This prevents overcharging and enables balancing of the battery pack. The controller also dynamically adjusts the wireless charging frequency band based on the battery health.

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Battery control to estimate and mitigate battery deterioration in electric vehicles. The control involves estimating the potentials of the positive and negative battery electrodes from the open circuit voltage curve. This provides a measure of the battery's state without a reference electrode. The potentials are used to set appropriate charge and discharge cutoff voltages that prevent hidden overcharge or overdischarge as the battery degrades. By adapting cutoffs to the actual battery state, it avoids excess wear and capacity loss from unnecessary overcharge/discharge.

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A method to automatically generate custom charging profiles for lithium-ion batteries that minimize degradation during fast charging. The method involves generating a lookup table of optimal charge rates for different states of charge based on testing various batteries. The table is used by battery management systems to charge specific batteries at the optimal rates for their charge levels. This reduces degradation compared to fixed fast charging rates.

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Charging control device for extending the lifetime of batteries in electronic devices like smartphones and vehicles. The device uses artificial intelligence (AI) techniques like neural networks to optimize battery charging. It analyzes battery health, usage schedules, and other factors to select the most suitable charging method. This reduces full charging time, which extends battery life compared to conventional charging. By using AI to intelligently control charging, deterioration of the batteries is reduced, and their overall lifetime is extended.

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Charge control apparatus for secondary batteries that improves charge speed without accelerating battery deterioration. The apparatus calculates a charge pattern based on the battery's internal state and deterioration model, and then updates the pattern as the state changes. By using a tailored charge pattern that reduces the rate of degradation, charging can be faster without harming the battery.

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Charging strategy to extend lithium-ion traction battery life in electric vehicles by maintaining a partial charge level over long storage periods to reduce degradation, then increasing to full charge before next use. The charging is based on projected storage duration and historical drive cycle data. The strategy balances between full charge for use and reduced charge to mitigate degradation during storage.

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Optimizing fast charging of electric vehicle batteries to balance charging time versus battery lifetime. The charging process starts with a fast charging phase where the voltage across the battery terminals is increased. Once it reaches a target voltage, the charging switches to a regulated voltage phase where the voltage is maintained at the target level. This allows the battery to charge quickly without degrading its lifetime.

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Charge control system for electric vehicles that can appropriately limit charging and stop overcharging even in low temperature environments. It lowers the charging power limit when the battery temperature rises during charging. If the battery temperature continues to rise even with the reduced charging limit, it indicates overcharging and can stop charging to prevent damage.

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A charging control system and method for extending the cycle life of a secondary battery like a lithium-ion battery charged from an electric generator in a vehicle. The charging control system suppresses the initial charging current when the battery is not fully charged. Charging current is gradually increased over time to reduce battery deterioration. This helps prevent damage from high initial currents and diffusion limitations. The control system is particularly effective at harsh temperatures below freezing or above 40C.

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Technique for charging batteries in vehicles in a way that maximizes speed while preventing damage from low temperatures. The technique involves creating a map of maximum charging currents that won't cause battery degradation at different temperatures. The charging system measures the battery temperature and uses the map to dynamically adjust the charging current to the maximum allowed for that temperature. This enables fast charging while avoiding damage due to lithium plating at cold temperatures.

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