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State Of Charge
State of charge (SOC) quantifies the remaining capacity available in a battery at a given time and in relation to a given state of ageing. It is usually expressed as percentage (0% = empty; 100% = full). An alternative form of the same measure is the depth of discharge (DOD), calculated as 1 − SOC (100% = empty; 0% = full). It refers to the amount of charge that may be used up if the cell is fully discharged. State of charge is normally used when discussing the present state of a battery in use, while depth of discharge is most often used to discuss a constant variation of state of charge during repeated cycles. In electric vehicles In a battery electric vehicle (BEV), the state of charge indicates the remaining energy in the battery pack. It is the equivalent of a fuel gauge. The state of charge can help to reduce electrical car owners' anxiety when they are waiting in the line or stay at home since it will reflect the progress of charging and let owners know when it wil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chemical Kinetics
Chemical kinetics, also known as reaction kinetics, is the branch of physical chemistry that is concerned with understanding the rates of chemical reactions. It is different from chemical thermodynamics, which deals with the direction in which a reaction occurs but in itself tells nothing about its rate. Chemical kinetics includes investigations of how experimental conditions influence the speed of a chemical reaction and yield information about the reaction's mechanism and transition states, as well as the construction of mathematical models that also can describe the characteristics of a chemical reaction. History The pioneering work of chemical kinetics was done by German chemist Ludwig Wilhelmy in 1850. He experimentally studied the rate of inversion of sucrose and he used integrated rate law for the determination of the reaction kinetics of this reaction. His work was noticed 34 years later by Wilhelm Ostwald. In 1864, Peter Waage and Cato Guldberg published the law ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Battery Management System
A battery management system (BMS) is any electronic system that manages a rechargeable battery (cell or battery pack) by facilitating the safe usage and a long life of the battery in practical scenarios while monitoring and estimating its various states (such as state of health and state of charge), calculating secondary data, reporting that data, controlling its environment, authenticating or balancing it. Protection circuit module (PCM) is a simpler alternative to BMS. A battery pack built together with a BMS with an external communication data bus is a smart battery pack. A smart battery pack must be charged by a smart battery charger. Functions Monitor A BMS may monitor the state of the battery as represented by various items, such as: * Voltage: total voltage, voltages of individual cells, or voltage of * Temperature: average temperature, coolant intake temperature, coolant output temperature, or temperatures of individual cells * Coolant flow: for liquid cooled b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Battery Charger
A battery charger, recharger, or simply charger, is a device that stores energy in an electric battery by running current through it. The charging protocol—how much voltage and current, for how long and what to do when charging is complete—depends on the size and type of the battery being charged. Some battery types have high tolerance for overcharging after the battery has been fully charged and can be recharged by connection to a constant voltage source or a constant current source, depending on battery type. Simple chargers of this type must be manually disconnected at the end of the charge cycle. Other battery types use a timer to cut off when charging should be complete. Other battery types cannot withstand over-charging, becoming damaged (reduced capacity, reduced lifetime), over heating or even exploding. The charger may have temperature or voltage sensing circuits and a microprocessor controller to safely adjust the charging current and voltage, determine the stat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Battery Balancing
Battery balancing and battery redistribution refer to techniques that improve the available capacity of a battery pack with multiple cells (usually in series) and increase each cell's longevity. A ''battery balancer'' or ''regulator'' is an electrical device in a battery pack that performs battery balancing. Circuitry that includes designs to balance cell charges during battery pack recharging may be either ''active'' or ''passive'' in its design, and is most often found in lithium-ion batteries, e.g., for laptop computers, electrical vehicles. etc. Rationale The individual cells in a battery pack naturally have somewhat different capacities, and so, over the course of charge and discharge cycles, may be at a different state of charge (SOC). Variations in capacity are due to manufacturing variances, assembly variances (e.g., cells from one production run mixed with others), cell aging, impurities, or environmental exposure (e.g., some cells may be subject to additiona ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Peukert's Law
Peukert's law, presented by the German scientist in 1897, expresses approximately the change in capacity of rechargeable lead–acid batteries at different rates of discharge. As the rate of discharge increases, the battery's available capacity decreases, approximately according to Peukert's law. Batteries Manufacturers specify the capacity of a battery at a specified discharge rate. For example, a battery might be rated at 100 A·h when discharged at a rate that will fully discharge the battery in 20 hours (at 5 amperes for this example). If discharged at a faster rate the delivered capacity is less. Peukert's law describes a power relationship between the discharge current (normalized to some base rated current) and delivered capacity (normalized to the rated capacity) over some specified range of discharge currents. If Peukert's constant k, the exponent, were equal to unity, the delivered capacity would be independent of the current. For a real battery the exponent is greate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NiMH
NIMH may refer to: * Nickel–metal hydride battery (NiMH), a type of electrical battery *National Institute of Mental Health, an agency of the United States government * National Institute of Medical Herbalists, a professional organisation in the United Kingdom *'' Rats of NIMH'', a series of children's books *''The Secret of NIMH ''The Secret of NIMH'' is a 1982 American animated Fantasy film, fantasy adventure film directed by Don Bluth in his directorial debut and based on Robert C. O'Brien (author), Robert C. O'Brien's children's novel, ''Mrs. Frisby and the Rats of N ...'', a 1982 animated film *'' The Secret of NIMH 2: Timmy to the Rescue'', a 1998 direct-to-video animated film See also * * {{disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kalman Filter
In statistics and control theory, Kalman filtering (also known as linear quadratic estimation) is an algorithm that uses a series of measurements observed over time, including statistical noise and other inaccuracies, to produce estimates of unknown variables that tend to be more accurate than those based on a single measurement, by estimating a joint probability distribution over the variables for each time-step. The filter is constructed as a mean squared error minimiser, but an alternative derivation of the filter is also provided showing how the filter relates to maximum likelihood statistics. The filter is named after Rudolf E. Kálmán. Kalman filtering has numerous technological applications. A common application is for guidance, navigation, and control of vehicles, particularly aircraft, spacecraft and ships Dynamic positioning, positioned dynamically. Furthermore, Kalman filtering is much applied in time series analysis tasks such as signal processing and econometrics. K ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nexus 9
The Nexus 9 (codenamed Volantis or Flounder) is a tablet computer co-developed by Google and HTC that runs the Android operating system. It is the fourth tablet in the Google Nexus series, a family of Android consumer devices marketed by Google and built by an OEM partner. The device is available in two storage sizes, 16 GB for US$399 and 32 GB for US$479. Along with the Nexus 6 mobile phone and Nexus Player digital media device, the Nexus 9 launched with 5.0 Lollipop, which offered several new features, notably a modified visual appearance, and the complete replacement of the Dalvik virtual machine with ART. Google has included an additional step to "Enable OEM unlock" before users can unlock the Nexus 9 bootloader. Release The Nexus 9 was announced on 15 October 2014, with pre-orders available on 17 October and was released on 3 November 2014. A 4G LTE version was released in the US on 12 December 2014. Specifications Hardware The Nexus 9 tablet featur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nexus 6
The Nexus 6 (codenamed Shamu) is a phablet co-developed by Google and Motorola Mobility that runs the Android operating system. It is the successor to the Nexus 5, and the sixth smartphone in the Google Nexus series, which is a family of Android consumer devices marketed by Google and built by an original equipment manufacturer partner. The Nexus 6 and the HTC Nexus 9 served as the launch devices for Android 5.0 "Lollipop". The Nexus 6's design and hardware is very similar to that of the second-generation Moto X, which was released around the same time, with the Nexus 6 being enlarged with higher specifications. Release The Nexus 6 was unveiled on October 15, 2014, with pre-order availability since October 29, 2014, and a delivery date in early November. Off-contract pricing in the United States was US$649 for the 32 GB model and US$699 for the 64 GB model. The Nexus 6 was available through Google Play Store, Motorola Mobility, Best Buy, T-Mobil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Maxim Integrated
Maxim Integrated Products, Inc., was an American semiconductor company that designed, manufactured, and sold analog and mixed-signal integrated circuits for the automotive, industrial, communications, consumer, and computing markets. Maxim's product portfolio included power and battery management ICs, sensors, analog ICs, interface ICs, communications solutions, digital ICs, embedded security, and microcontrollers. The company is headquartered in San Jose, California, and has design centers, manufacturing facilities, and sales offices worldwide. In 2021, the company was acquired by Analog Devices. History Maxim was founded in April 1983. The founding team included Jack Gifford, a semiconductor industry pioneer since the 1960s and co-founder of Advanced Micro Devices; Fred Beck, an IC sales and distribution pioneer; Dave Bingham, General Electric’s Scientist of the Year in 1982; Steve Combs, a pioneer in wafer technologies and manufacturing; Lee Evans, also a pioneer in CMOS a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Integral
In mathematics, an integral is the continuous analog of a Summation, sum, which is used to calculate area, areas, volume, volumes, and their generalizations. Integration, the process of computing an integral, is one of the two fundamental operations of calculus,Integral calculus is a very well established mathematical discipline for which there are many sources. See and , for example. the other being Derivative, differentiation. Integration was initially used to solve problems in mathematics and physics, such as finding the area under a curve, or determining displacement from velocity. Usage of integration expanded to a wide variety of scientific fields thereafter. A definite integral computes the signed area of the region in the plane that is bounded by the Graph of a function, graph of a given Function (mathematics), function between two points in the real line. Conventionally, areas above the horizontal Coordinate axis, axis of the plane are positive while areas below are n ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
