Performance Stability of EV Batteries

State estimation and balanced optimization control for energy storage battery systems that dynamically balances battery groups during charging based on their usage and conditions. The control device estimates battery health and optimizes balancing between multiple battery groups in an energy storage system. It uses a custom state estimation algorithm to accurately estimate battery health instead of using complex battery models. The balancing logic adjusts the charging currents of individual batteries based on factors like usage, temperature, and vibration to prevent over-equalization during charging. This flexible balancing strategy improves equalization effectiveness compared to fixed threshold balancing.

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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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Battery pack temperature control method that balances battery life extension with cooling energy conservation. The method involves detecting the battery pack's State of Charge (SOC) and determining the corresponding target temperature threshold for cooling based on preset SOC intervals and battery life requirements. It aims to cool the pack to below the threshold without excessively cooling. This prevents overcooling waste while ensuring the pack's life needs are met.

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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 controller for high-voltage multi-cell battery packs that provides advanced features like temperature compensation, charging protection, fault diagnosis, and communication to optimize battery performance and longevity. The controller uses a microcontroller, analog-digital converter, temperature sensor, heating module, output control module, status display, and communication interface. It collects cell voltages, temperatures, and currents, performs calculations, and outputs control signals to protect against overcharge/discharge, overtemp, low power, and faults. It also displays battery status and communicates with other devices.

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Energy storage battery management system that improves consistency, longevity, and safety of battery packs in energy storage systems. The system uses a battery management unit (BMU) to monitor and equalize voltages and temperatures of individual cells in real time. This prevents common mode voltage issues and cell imbalances that can degrade battery pack performance. A battery cluster management unit (BCMU) monitors pack-level parameters like total voltage, current, and temperature. This allows accurate pack-level charge/discharge control and abnormality detection. The system also has a fire protection system to monitor electrical safety and provide fire detection, warning, and extinguishing capabilities.

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Vehicle battery charging and discharging system that optimizes charging and discharging speed of electric vehicle batteries based on the battery's state of deterioration and power system frequency fluctuations. The system measures battery parameters, calculates deterioration state, maps optimal charging/discharging rates for current deterioration and frequency, and adjusts charging/discharging power accordingly. This enables delaying battery degradation when charging/discharging rapidly on unstable power grids.

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Battery management technique that reduces battery degradation by optimizing charge and discharge rates based on the operating mode and state of charge. It involves using two charge/discharge modes: a low rate mode below a certain C rate for normal operation, and a temperature suppression mode to prevent sudden temperature changes. The C rate limit is adjusted between the modes to balance load reduction and temperature management. This allows flexible control of charge/discharge rates to mitigate battery degradation in different operating conditions.

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Energy storage battery current sharing control method to prevent circulation currents between parallel connected battery packs and extend battery life. The method involves calculating and adjusting the output current of each battery pack based on its SOC, SOH, and capacity. Temperature monitoring is also done and the current is further adjusted based on temperature changes to improve aging consistency. This prevents circulation currents from packs with different capacities and aging levels.

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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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Lithium-ion battery electrodes with a unique non-uniform porous structure that enhances performance compared to conventional electrodes. The positive electrode is made by setting the porosity of the surface layer higher with larger active material particles compared to the inner layer. This non-uniform structure improves battery rate performance and capacity retention by reducing resistance and impedance.

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Controllable lithium-ion battery design with long cycle life by precise pre-lithiation of the negative electrode. The battery includes a standard cell with positive and negative electrodes, separators, etc., and adds an independent lithium replenishing electrode or a metal lithium layer on the negative electrode. The lithium layer supplies excess lithium ions to compensate for cycle-induced lithium loss. The lithium replenishing amount is precisely controlled to optimize battery life without excessive over-lithiation.

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Enhanced lithium secondary batteries with improved capacity, cycle life and output. The batteries use positive and negative electrodes with specific properties, and a nonaqueous electrolyte containing a specific compound. The positive electrode has a conductive material content of 6-20% by mass, a density of 1.7-3.5 g/cm3, and an active material layer thickness to current collector thickness ratio of 1.6-20. The negative electrode has an average primary particle diameter of 0.1-2 μm and a tap density of 1.3-2.7 g/cm3.

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Battery pack with improved low-temperature endurance by optimizing discharge voltage plateaus of different cells. The battery pack has an outer area, middle area, and inner area inside the pack. Cells with dual voltage plateaus are arranged with lower plateau bias towards the colder outer area and higher plateau bias towards the warmer inner area. This balances discharge capacities at low temperatures.

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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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Battery heating system for electric vehicles to improve battery performance in cold temperatures without impacting state of charge. The system uses a bidirectional DC-DC converter and auxiliary energy storage device connected to the vehicle battery. The converter alternates the current direction through the battery at a controlled frequency. This generates internal resistance and heating. The state of charge remains constant since current flows in and out. The frequency can be optimized based on battery temperature and age.

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Aging lithium-ion battery electrolytes before cell assembly to increase cycle life and stability. The aging process involves allowing the electrolyte to sit for several days at room temperature before using it in batteries. This aging step allows the electrolyte additives to partially decompose and transform into more effective species that protect the electrodes and stabilize the electrolyte during cycling.

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Microporous polymer separator with improved shutdown properties for lithium ion batteries. The separator has a microporous polyolefin membrane coated with a thin, uniform layer of inorganic particles to enhance heat resistance and prevent internal short circuits. The separator resists shrinking, tearing, and pinhole formation above the melting point of the base polymer, which can cause electrode exposure and shorts. The coated separator maintains shutdown properties and dimensional stability at high temperatures.

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Battery module design for improved EV battery performance and safety while reducing swelling and failure rates. The module has an elastic bead unit between the battery cells and the cover plate that applies a controlled amount of pressure to the cells. This improves performance and enables better swelling control compared to conventional modules. The module design can be used in battery packs that are used in electric vehicles.

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