Battery Management Systems for Electric Vehicles

Power battery charge and discharge control method to avoid battery aging and extend life by optimizing charging/discharging based on temperature at multiple positions of the battery. The method involves getting battery voltage and temperatures at multiple points, computing allowable currents for each temperature, finding the target power based on voltage and allowable currents, and charging/discharging the battery to that power level. This prevents excessive heating/cooling during charging/discharging by accounting for temperature differences.

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A battery charge and discharge control system that optimizes battery performance and longevity by dynamically adjusting charge and discharge strategies based on temperature. The system has a charge controller that receives temperature data from the battery cells. It then outputs different control signals based on cell temperature to the charging controller. The charging controller uses these signals to generate charging modes with optimized power levels for each temperature range. This allows faster charging without overloading the cells at high temperatures, preventing damage at low temperatures, and maintaining efficient charging across all temperatures.

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Advanced battery management system for electric vehicles that optimizes battery performance, safety, and lifespan through sophisticated monitoring, control, and communication techniques. The system continuously monitors voltage, current, temperature, and state of charge of each battery cell. It analyzes this data to determine cell health and performance. Based on the analysis, it regulates charging and discharging of the cells to optimize battery life and vehicle performance. It also implements safety measures to prevent overcharging, over-discharging, and thermal runaway. The system communicates real-time battery data to remote servers for monitoring and analysis.

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Intelligent battery pack balancing system for electric vehicles and energy storage that provides comprehensive balancing of voltage, state of charge (SOC), and temperature to improve battery pack performance and life. The system uses multi-level balancing strategies, real-time monitoring, and safety protection. It selects batteries with large voltage or SOC differences, and adjusts current to balance. It also dynamically prioritizes voltage vs SOC balancing based on severity. Temperature balancing involves adjusting cooling and heat sinks.

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Charging control method for electric vehicles that improves battery performance in cold temperatures. When the battery temperature is below a threshold, the method selectively powers the load from a battery pack with better low-temperature performance, while the other pack charges. This raises the temperature of both packs for optimal performance. By prioritizing discharge from the better pack, the battery packs heat up during normal operation instead of waiting for internal resistance heating. This allows electric vehicles to have normal performance in cold conditions.

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Efficient cooling of vehicle batteries to prevent thermal runaway without increasing weight or cost. The cooling method involves using the vehicle's air conditioning system to cool the battery when the ambient temperature is high, and using the battery's own cooling system when the ambient temperature is low. This allows efficient cooling without adding weight or cost by leveraging the existing air conditioning system when ambient temperatures are high, and using the battery's own cooling system when ambient temperatures are low. The method involves monitoring the battery temperature and switching between the two cooling sources based on ambient temperature.

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Temperature control method and system for lithium-ion batteries that accurately monitors and manages the temperature of individual battery units in a multi-cell lithium-ion battery pack to prevent overheating and damage. The method involves determining the initial battery state and charging parameters for each unit, monitoring temperatures during charging, detecting abnormal events, adjusting charging rates, and compensating for temperature differences between units and the environment. This allows precise temperature management of each cell to avoid overheating and ensure safe charging.

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Intelligent lithium battery control system that improves performance, reliability, and safety of lithium battery packs used in electric vehicles, drones, and energy storage systems. The system monitors battery status, optimizes charge/discharge strategies, predicts battery health, manages power peaks, balances energy use, provides remote monitoring, and implements short circuit protection. Algorithmic optimization, temperature management, and data analysis enhance battery performance and longevity.

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Method to improve charging of batteries, especially at low temperatures, by preheating the battery pack before charging. The method involves determining if the battery pack voltage or temperature is below thresholds, then increasing it to a minimum threshold. Once reached, charging at a higher rate is allowed. This prevents charging at low temperatures that degrade battery life. The preheating can be done internally by the battery or externally by a charger. The preheating is stopped when the pack reaches a minimum temperature for optimal charging.

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A method for safely charging a traction battery in electric vehicles to avoid overcharging and potential safety issues. The method involves monitoring battery parameters like state of charge (SOC) during charging, and discharging or stopping charging when the parameter changes by a certain threshold. This prevents continuous charging if the battery is already full, preventing overheating, lithium plating, and other problems.

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Battery module with a relay driver that uses direct current (DC) to control a relay to reduce electromagnetic compatibility (EMC) issues. The relay driver provides a first DC current to close the relay and a second DC current to keep it closed. The second current has different parameters than the first current. This avoids switching the relay coil with pulse-width modulation or constant voltage that causes EMC problems.

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Electrified vehicle thermal management system that enables optimized cooling and heating of the battery pack and other components while avoiding overcooling. The system uses a valve to selectively direct coolant flow through a bypass loop or the battery pack based on heat rejection from a charge air cooler. This prevents overcooling by bypassing the battery when the coolant is already hot from the air cooler.

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Working vehicle that prevents over-discharge of the battery when driven while connected to an external power source. The vehicle has a battery, charger, sensor, controller, display, and switch. A battery management system monitors the charger and battery when driven while connected to external power. It switches the vehicle to use the charger power instead of the battery power when the charger is connected and a signal allows driving connected. This avoids over-discharge if the operator forgets to switch manually.

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Battery pack structure for electric vehicles that improves temperature uniformity and heating control with a heating plate enclosed in a heating unit. The battery pack has a heating plate that surrounds the battery cells and a separate heating unit that encloses the heating plate. This provides better temperature uniformity and heating compared to directly attaching heaters to individual cells. A control unit monitors the battery temperature and operates the heating unit as needed.

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Secondary battery system with connected battery modules that each have a heating device. The system controller determines the power supplied to each module's heater so that modules with higher SOC or charge receive more heating power. This balances the charge levels between modules by consuming excess energy from higher charged modules. The controller also activates heating based on temperature, SOC, or charge levels. This reduces SOC and charge imbalances between modules while minimizing wasteful power consumption. The system can be used in electric vehicles to maintain module performance and longevity.

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Management of the power provided by the batteries in vehicles to ensure that critical systems always have power while conserving battery capacity when the vehicle is not in use. The management involves disconnecting the main vehicle battery from all systems except the ignition when the engine is off. A separate auxiliary battery powers non-essential systems. This preserves the main battery charge to start the vehicle.

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A battery system that can detect the presence of liquid inside the housing of the battery system. The system uses a liquid detector connected to the battery management system. The detector includes a high-voltage conductor that is connected to the bus bars of the battery cells. The conductor extends into a tray located in the housing. If cooling liquid leaks from the battery module, it will collect in the tray and complete the conductivity path to the conductor, triggering the detector. This enables monitoring of the cooling liquid level and verifying if leaked battery coolant is accumulating in the tray.

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Electric powered working machine that manages battery charging to avoid obstructing work plans while still providing diagnostic battery conditioning charges. The machine has a controller that determines whether to recommend and execute a diagnostic charge with rest periods based on battery history and estimated charge time. This prevents unnecessary and potentially long charges that could disrupt work schedules.

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Battery module that manages heat according to external temperature to prevent power degradation in cold environments. The module includes a housing containing battery cells, busbar frames covering the cells, end plates sealing the housing, and a thin film layer between the busbar frame and end plate. The film layer automatically heats up in cold temperatures to warm the cells and prevent power loss.

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Battery temperature adjustment to maintain performance while reducing energy consumption when parked for extended periods. The system checks scheduled parking time and only adjusts battery temperature if it's shorter than a threshold. This avoids using battery power to maintain temperature during long parking periods when the vehicle is unlikely to be used.

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