17 results about "Internal resistance" patented technology

The invention discloses an accumulator battery online equalizing system which comprises a central processing controller, an electricity quantity acquisition module, a battery switching module, a voltage online equalizing module, an internal resistance and capacity online equalizing module and the like. The system can perform online and real-time equalizing adjusting on the voltage, the internal resistance and the capacity of a battery cell in an accumulator battery, can ensure that each battery in the accumulator battery is operated at an optimized operating state, greatly prolongs the operating life of the accumulator battery by more than two times, improves the reliability and the performance of the accumulator battery, reduces the environment pollution caused by the battery, and has good social benefit and environmental protection property; and the system adopting the active equalizing method can cancel the traditional equalizing method of periodic charging, reduces water loss of the battery, greatly reduces the probability of incontrollable low heat, prolongs the service life of the battery, simultaneously avoids the vulcanization of the battery, and saves a large amount of cost.

The invention relates to an electrolyte for a ternary cathode material lithium ion battery. The electrolyte comprises a lithium salt, organic solvent and an additive, wherein the lithium salt is an imidodisulfuryl fluoride lithium salt of which the concentration is greater than 1 mol/L; the organic solvent comprises cyanogen carboxylate and other non-water organic solvent; the addition mass of the cyanogen carboxylate is 5-35% of the total mass of the organic solvent; the cyanogen carboxylate is a combination of one or more selected from the following structural formulae in the specification; and at least one of R1 and R2 is a cyanogen radical or a cyanogen radical containing group. By using the electrolyte provided by the invention, the cycle performance of the ternary cathode material lithium ion battery at normal temperature can be stabilized, the aging and swelling phenomena of the ternary cathode material lithium ion battery under high-temperature conditions can be inhibited, and the internal resistance of the ternary cathode material lithium ion battery is reduced.

Provided is an auto-thermal evaporative liquid-phase synthesis method for cathode material for battery, comprising the following steps: (1) Adding a synthetic raw material of cathode material into a solvent to obtain a mixture A, the synthetic raw material of the cathode material containing lithium source, adding an accelerant into the mixture A, which makes the mixture A achieve a strong auto-thermal reaction to release heat to evaporate the solvent, and obtaining a solid precursor of the cathode material; (2) Drying the precursor, sintering in an atmosphere furnace and obtaining the cathode material. The method is simple in process, low in energy consumption, requirements for equipment and cost, and is applicable to industrial mass production and application. The cathode material obtained through the method is stability in batch, easy to process, low in internal resistance and high in capacity and has an excellent charging and discharging performance.

The invention discloses a heating circuit of a battery. The heating circuit comprises a temperature sensor, a battery management device and a charging circuit. The temperature sensor is mounted in a battery pack; the temperature sensor detects the real-time temperature of the battery pack and sends a temperature signal. The battery management device is connected with the temperature sensor; the battery management device receives the temperature signal sent by the temperature sensor. The charging circuit is connected with the battery management device, wherein the battery management device compares the temperature signal with a critical temperature; when the temperature signal is lower than or equal to the critical temperature, the battery management device controls the charging circuit towork in a high-frequency heating mode and the charging circuit heats the battery pack; when the temperature signal is higher than the critical temperature, the battery management device controls the charging circuit to work in a charging mode and the charging circuit charges the battery pack. The heating circuit of the battery is used for realizing heating the battery through the high-frequency charging and discharging to the battery by utilizing the properties that the battery is high in internal resistance at a low temperature and generates much heat, and the influence cannot be generated tothe safety of the battery by high-frequency alternating-current charging and heating.

The invention provides a manufacturing method of a winding type lithium ion battery and the winding type lithium ion battery, and relates to the technical field of lithium ion batteries. The method comprises the following steps: punching a foil on one side of a positive pole piece and a foil on one side of a negative pole piece to be saw-toothed to form a saw-toothed positive pole piece and a saw-toothed negative pole piece; arranging an isolating film between the saw-toothed positive pole piece and the saw-toothed negative pole piece in a laminating mode for winding to form multiple layers of positive tabs and multiple layers of negative tabs. The battery comprises an outer composite aluminum plastic film and a multi-tab lithium ion cell, wherein the multi-tab lithium ion cell comprises the positive pole piece, the isolating film and the negative pole piece which are laminated and then wound; one side of the positive pole piece and one side of the negative pole piece adopt saw-toothed structures, and the positive pole piece and the negative pole piece are wound to form the multiple layers of positive tabs and the multiple layers of negative tabs. The production efficiency of a Z-shaped lamination battery is improved, the potential safety hazard of a Z-shaped lamination process in assembly is reduced, the internal resistance of the battery is reduced, and large current discharge is achieved.

The invention discloses a method for optimizing fuel cell performance based on frequency and a secant angle. The method comprises the steps that in the working condition of the optimal temperature and humidity at which the total internal resistance Rstack of a PEMFC is minimal, the internal resistance of each galvanic pile segment at the moment is measured, and the ideal high-frequency corner frequency f<optimal> and ideal secant angle alpha<optimal> of different electric current densities are acquired correspondingly; with the f<optimal> and the alpha<optimal> as optimization indexes, focusing on the galvanic piles in any working condition, it is only necessary to emit two frequency signals of the highest frequency (20 KHz) and the ideal corner frequency f<optimal> to monitor the current alpha angle, and through uninterrupted adjustment of relevant control variables, the current alpha angle is changed and tends toward the optimal angle alpha<optimal>, so that the galvanic piles are adjusted to the optimal working state. According to the method, improvement is conducted on traditional EIS methods, and the total internal resistance Rstack is quickly calculated by means of a simultaneous equation solution method; not only is optimization of the galvanic pile output performance of the PEMFC achieved from the internal resistance angle, but also the defects that by means of the traditional EIS methods, the hysteresis is large and real-time detection cannot be conducted are overcome, and operation is simpler and the optimization performance is better compared with traditional methods.

The invention discloses an online self-learning measurement device for an internal resistance of a lithium battery and a measure method thereof. The measurement device comprises a lithium battery body, and further comprises a current sensor for detecting a current signal of the lithium battery body; an electricity sensor for detecting and calculating current electricity of the lithium battery body; a temperature sensor for detecting temperature of the surface of the lithium battery body; a cycle counter for calculating the cycle numbers of the lithium battery body that has been used; a controller for calculating a current internal resistance of the lithium battery body with the current signal parameter, the current electricity parameter, the temperature parameter, the voltage signal parameter and the cycle numbers; a voltage controller for converting a terminal voltage analog signal of the lithium battery body into a digital signal; a correction load for online learning and correctionof the internal resistance measurement device. The online self-learning measurement device for internal resistance of lithium battery can combine offline detection, calibration and online self-learning correction for remaining use time of the lithium battery and has the characteristics of good robustness, high precision and online self-adaptation.

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a pole piece for a button battery. The pole piece comprises a current collector including a coating area and an empty foil area which are adjacently arranged, an active substance layer and a tab, wherein the empty foil area is provided with unfoldable wrinkles; the active substance layer is arranged on at least one surface of the coating area; and the tab is connected with the empty foil area. According to the invention, the current collector empty foil area is provided with the unfoldable wrinkles so that in the charging expansion process of a roll core of the button battery, the wrinkles of the current collector empty foil area of the outermost layer pole piece of the roll core have a certain extension space, and the outermost layer pole piece of the roll core can be prevented from being broken due to a pulling stress; and the reject ratio of a large internal resistance and the reject ratio of a zero voltage are also reduced.

The invention discloses a novel formaldehyde sensor comprising a casing. An electrode carrier, a working electrode and a counter electrode are fixedly connected to the inner side wall of the casing. Aworking electrode lead and a counter electrode lead are connected to the working electrode and the counter electrode respectively; and one end of each of the working electrode lead and the counter electrode lead passes through the casing and extends to the outside. Therefore, the outer dimension of the casing is reduced; and a phenomenon of the sensor abnormity caused by the internal resistance increasing due to dehydration of the perfluorinated proton exchange membrane is avoided.

The invention provides a positive electrode material and a preparation method and application thereof, the positive electrode material comprises a positive electrode material core, a first coating layer coating the surface of the positive electrode material core and a second coating layer coating the surface of the first coating layer, the first coating layer comprises a first cobalt compound, and the second coating layer comprises a second cobalt compound. The second cladding layer includes a second cobalt compound. The surface of the core of the positive electrode material is coated with the first coating layer and the second coating layer, and the first coating layer and the second coating layer both comprise the cobalt compound, so that the ion and electron conductivity of the surface of the material can be effectively improved, and the internal resistance of the battery is reduced; meanwhile, the first coating layer and the second coating layer are good in combination effect and stable in interface structure, and the prepared battery has relatively low direct-current resistance and relatively high capacity retention rate and also has relatively good electrochemical performance at low temperature.

A lead acid battery is described that makes it possible to suppress an increase in internal resistance and to accurately determine the state of charge or the state of degradation by a method of measuring the internal resistance. The lead acid battery includes an electrode plate group in which a plurality of positive electrode plates having a positive active material containing lead dioxide and a plurality of negative electrode plates having a negative active material containing metallic lead are alternately stacked with separators interposed therebetween. The electrode plate group is immersed in an electrolyte. The flatness of the positive electrode plates after chemical conversion is equal to or less than 4.0 mm