An apparatus for estimating a condition of a battery includes a mode identifying unit configured to identify a usage mode of the battery during a period of time and its corresponding attenuation curve, according to recorded data on battery usage, stored usage modes of the battery and attenuation curves corresponding to the various usage modes, the attenuation curve representing a change of a fully charged capacity of the battery with battery usage; and a condition estimating unit configured to calculate battery degradation according to the recorded data, the identified usage mode and its corresponding attenuation curve, the degradation representing a quantity of the fully charged capacity of the battery that is reduced over the battery usage. The condition of the battery is estimated so as to rationally judge the residual value of the battery in operation.

Estimating condition of battery, related system and vehicle

A power management system is disclosed for providing an indication of the required available capacity (RAC) available from a backup battery unit (BBU) for backup or peak loading as required by a critical DC load, such as a computer bus. The power management system is configured to repeatedly determine the gross remaining capacity of the backup battery unit (BBU). The system processes this information and other measured or known battery parameters to determine the required available capacity (RAC). The RAC is based upon the required capacity of the critical load to which the BBU is connected. In general, the RAC is the difference between the gross remaining capacity of the battery at a given point in time and the required capacity of the critical load. In accordance with an important feature of the power management system, an indication of the RAC is provided. This indication can be used to indicate that the battery needs to be replaced or that the battery requires service and might indicate that the battery needs to be charged, needs to be warmed up, cooled down, etc.

Required Available Capacity Indication for Battery Backup Unit

The invention provides a method for judging the health degree of batteries. The method includes the first step of obtaining the voltage of battery cells in a battery pack at the terminal stage of charging in an online real-time mode; the second step of calculating the serial numbers of the first group of battery cells with the highest voltage in an online real-time mode and storing the serial numbers; the third step of calculating the serial numbers of the second group of battery cells with the lowest voltage at the current in an online real-time mode when the voltage of certain battery cells is smaller than a voltage threshold value at the terminal stage of discharging; the fourth step of comparing the stored serial numbers of the first group of battery cells and the serial numbers of the second group of battery cells, and determining the battery cells with the same serial numbers in the serial numbers of the first group of battery cells and the serial numbers of the second group of battery cells to be the battery cells with the smallest capacity relative to other battery cells. According to the method, the online dynamic judging of the health degree of the batteries when a vehicle runs can be achieved, early warning can be carried out when the health degree of the batteries is too low, the overuse of the batteries is avoided, and the batteries can be used safely and reliably.

Method for judging health degree of batteries

The invention relates to a lithium ion battery quick screening method. The method includes the following steps that firstly, an open-circuit voltage value and a discharged electric quantity value existing after constant-current discharge are measured, and a corresponding charge state value is obtained by checking a meter; secondly, an open-circuit voltage value and a discharged electric quantity value existing after dynamic working state discharge are measured, and a corresponding charge state value is obtained by checking a meter; thirdly, the maximum available capacity of lithium ion batteries is estimated; fourthly, parameter identification is conducted on ohmic resistance of the lithium ion batteries by means of the obtained dynamic working state data and an equivalent circuit model; fifthly, the lithium ion batteries are screened according to the obtained maximum available capacity of the lithium ion batteries and the ohmic resistance. By means of the method, quick screening of the two parameters, including the maximum available capacity and the ohmic resistance, of the lithium ion batteries is achieved. Compared with a lithium ion battery quick screening method in the prior art, the method has the advantages of being quick in judgment, simple and high in precision and plays an important role in screening a battery pack, good in consistency, in the lithium ion batteries later.

Lithium ion battery quick screening method

The invention discloses an imbalance fault determining and balancing method for a battery pack, and the method comprises two steps: fault determining and balancing strategy The step of fault determining comprises the steps: setting a work current direction of a battery, setting a judgment node K, a voltage characteristic parameter P, a deviation standard value Pm and a fault threshold value V, and carrying out calculation and comparison according to the fault data of voltage difference between two different working current directions of a cell, so as to classify the imbalance faults of the battery Corresponding balancing measures are employed at the balancing strategy step according to different fault types The method can effectively determine the type of an imbalance fault of the battery pack, employs a targeted balancing measure, improves the power performance of the battery pack, and prolongs the service life of the battery pack

Imbalance fault determining and balancing method for battery pack

Die Erfindung betrifft ein Verfahren sowie eine Vorrichtung zum Uberwachen der maximal verfugbaren Kapazitat einer Batterie sowie eine unterbrechungsfreie Stromversorgung (30), die eine Prognose der aktuellen Laufzeit einer Batterie (110) ermoglichen. Hierzu wird ein Verfahren zur Verfugung gestellt, nach dem zunachst eine Mehrzahl von verschiedenen Entladeschlussspannungswerten bereitgestellt wird. Nunmehr wird die Batterie (110) entladen, und der Entladeschlussspannungswert ermittelt, auf den die Batterie entladen worden ist. Anschliesend wird der Zahlerstand des Zahlers (120, 130) inkrementiert, welcher dem ermittelten Entladeschlussspannungswert zugeordnet ist. Fur jeden Entladevorgang werden diese Schritte wiederholt. Nunmehr wird der Zahlerstand jedes Zahlers (120, 130) ausgelesen und ein erster Faktor in Abhangigkeit von den ausgelesenen Zahlerstanden, welcher ein Mas fur die Abnahme der maximal verfugbaren Batteriekapazitat darstellt, ermittelt.

Method and apparatus for monitoring the maximum available capacity of a battery

Die Erfindung betrifft ein Verfahren sowie eine Vorrichtung zum Uberwachen der maximal verfugbaren Kapazitat einer Batterie sowie eine unterbrechungsfreie Stromversorgung (30), die eine Prognose der aktuellen Laufzeit einer Batterie (110) ermoglichen. The invention relates to a method and an apparatus for monitoring the maximum available capacity of a battery, and an uninterruptible power supply (30), which allow a forecast for the current runtime of a battery (110). Hierzu wird ein Verfahren zur Verfugung gestellt, nach dem zunachst eine Mehrzahl von verschiedenen Wertebereichen der Entladeschlussspannung bereitgestellt wird. For this purpose, a method is provided, after the first providing a plurality of different ranges of values ​​of the discharge voltage. Nunmehr wird der Batterie (110) Strom entnommen, und der Entladeschlussspannungswert ermittelt, auf den die Batterie gelangt. Now, the battery (110) is removed from power, and determines the Entladeschlussspannungswert to which arrives the battery. Das Auftreten der Entladungsschlussspannungswerte wird hinsichtlich der Wertbereiche gezahlt (16,17, Zahler 120,130). The occurrence of the discharge circuit voltage values ​​is counted in terms of value ranges (16,17, 120,130 meters). Fur jeden Entladevorgang werden diese Schritte wiederholt. For each unloading these steps are repeated. Nunmehr wird der Zahlerstand jedes Zahlers (120,130) ausgelesen und ein erster Faktor in Abhangigkeit von den ausgelesenen Zahlerstanden, welcher ein Mas fur die Abnahme der maximal verfugbaren Batteriekapazitat darstellt, ermittelt (17-2). Now the count of each counter (120,130) is read and a first factor depending on the read-out meter readings, which is a measure of the decrease in the maximum available battery capacity, determined (17-2).

Hartmunt Henkel

Papers

Method and apparatus for monitoring the maximum available capacity of a battery

Method and device for monitoring the maximum available capacity of a battery

Verfahren und Vorrichtung zum Überwachen der maximal verfügbaren Kapazität einer Batterie