Digital battery

Supporting the infrastructure of modern society must be based on a very high operational reliability. Internet and telecommunications switching center server farms to ensure nearly 100% of sentence “without run-time” or availability of the system, they rely primarily on a very mature technology - lead Sony VGP-BPS9/S Sony VGP-BPS9A battery of acid, while the center of data storage used in high technology. Typically, these key nodes, and many other important areas are equipped with standby power, the supply of electricity in standby mode is usually the first level inverter, the inverter pair of VRLA (VRLA) battery or yield similar battery sealed gel battery assembly section of energy conversion.

 

The reason why traditional techniques are widely used, there are many reasons, including lead acid batteries affordable, but also with exceptional reliability. But while Great but not perfect. VRLA battery life is limited (generally 12 years of life from conception), often mission critical systems using the battery as a source of backup power, but changed regularly. Failure may indeed occur. In a typical standby power, the role of the battery as its name - they still maintain a fully charged state to await the primary power failure. And when fully responsible for the prosecution small current through the float “charge to keep. If the float current is below a ceiling, then the battery in the gas produced by electrolysis will be re-chemical combination. In this case, a single voltage battery float is slightly higher than the standard value of 2.27 V, may also damage the battery. A little more tension will cause precipitation of the electrolyte capacity of more recombination more gas, these gases are not handled by the overflow valve. If the battery temperature is too high, even if the charging voltage is appropriate, can lead to loss of electrolytes. Inspiron 630m battery Inspiron 640m battery

 

Other methods of early termination of sulfation, columns and very bad network connection, the connection plate to the network and evil, the stratification of electrolyte and a grid to accelerate corrosion. There is still another, if a failure mode low, but catastrophic - thermal runaway, which is peculiar to VRLA gel batteries, and a failure mode can lead to catching fire. The only way to avoid thermal runaway is to control the internal temperature of the battery.

 

Simply monitoring the battery voltage on the detection of lead-acid battery capacity decline in the role is very limited, it has been recognized in the industry. When the battery performance diminishes, it is usually presented is that the nominal voltage, until the release of large currents can only apparent, but when its capacity has been considerably reduced voltage drop prematurely. By measuring the proportion of electrolyte to determine the condition of the battery accurately, the method of the VRLA or sealed gel batteries do not apply; routine battery of tests used in the only way is to discharge the battery to a state controlled the next, but this approach need to stop using the battery. In addition, the depth of discharge also reduces the life of lead acid battery; in on a regular basis to conduct its test backup battery discharge, and its principal power with high reliability of the system, most programs use this test to determine the battery life. Satellite M55 battery Tecra A3 battery

 

Recently, continuous monitoring may be a non-interference electronic method of detecting a single cell near the failed state, this method can not only save costs, while maintaining overall system availability. The predecessor of these systems is usually measured cell or battery (battery industry term meaning that the shell in the same packages multiple battery) voltage - despite its limitations is well known - with charge / discharge current and temperature ambient. Some systems attempt to guess the extent or strength of the internal battery, its effectiveness varies.

 

LEM Sentinel system is dependent on basic parameters of a simple analog measurement of change leading product has now become the first of three generations of the Sentinel III. It is tailored in a single chip SoC (System on Chip) IC on the integration of analog and digital technologies. The device configured in a measured terminal voltage, the temperature of the internal battery and internal resistance of the module, can provide accurate measurement results for the cost of new in most of the configuration of the backup system can afford in the budget system is the design of a key. IBM ThinkPad R51 battery  IBM ThinkPad R52 battery

 

Battery temperature and / or the internal impedance of the exponential growth, the value of the instructions they are close to failure, the system of records to track data over time, d ‘ identify possible approaches fail. All modules are configured Sentinel III with a probe for measuring the outside temperature or the patch can be bound directly to a single cell or battery casing to accurately monitor the battery temperature as much as possible.

 

The battery is used or is being loaded, you can use a mature technology assessment of the internal impedance. Typically, the float voltage superimposed DC measuring low AC voltage and AC current at that time, and then measures the results of the projection of the internal impedance, the methods of specific implementation are different. However, this method has limitations, it can not cope with a form of the exponential curve. And expiring at the failure process of a single cell in the data recorder of their failure to recognize the trends appeared in good condition, on the contrary, the problems of failure, the battery may be short term be completely ineffective.

 

LEM has developed a more sophisticated algorithm, which can be detected as early as possible is a single cell performance decay. The result is a methods test very reliable, it can completely penetrate the energy of a single layer of cells to ensure maximum reliability. It is commonly called the Randles equivalent circuit, based on the performance of the electrochemical cell from the electrical components of a network circuit, each electrical component consisting of a single cell of associated physical factors. PB994A PP2182D

 

The same features or capabilities during the discharge period of falling have also been confirmed. All the impedance of the equivalent circuit of factors are to follow curves similar fall in the early stages of failure or capacity, no significant change. If the impedance state to a single main battery indicator, it will not provide meaningful guidance, unless the volume down more than 25-30%. Because the industry standard is to replace the provisions of the performance has fallen below 80% of cell performance, it is clear that the importance of early identification of possible failure.

However, in the Randles equivalent circuit, there is a parameter in a battery failure unique (except for a simple metal corrosion, the parameters of this mode of failure by increasing Rm forthcoming) will start to change, ie CDL-in, double-layer capacitance. Figure 3 below Natiao curves of their properties; In addition, the stage performance in the ordinary course of normal cells, and the assumption that power is fully charged batteries failed, its curved shape is similar Cdl.

 

Monitoring Technology

 

This article does not detail the surveillance techniques as described below, a brief description of their behavior.

 

One by one, to feed test signals into a single cell, without requiring the entire battery in high current, there was no connection to the DC system external interference. Bipolar test signal using the original algorithm is modified, but the results show that the reliability of the signal pole. However, when tested with a unipolar signal, the DC drift. Easy to eliminate this drift and can not maintain all data features, which is characterized by precise determination of parameters needed. Use of frequency scanning signal pulse method rearrangement of different frequencies (including the test signal), allows the response of the battery voltage curves coincide with the book. RN873 Y6142

 

Once the curve derived from the potential to become a rule, you can set the firmware algorithm that style drift and eliminating it and thus be adapted to the direct input Sentinel algorithm, the average zero-sets of data voltage. This method can be reduced to the drift error of 0.1%, it will not cause a significant distortion of the data sets. Therefore, measures of waveform can also be used in the algorithm, so that the accuracy of equivalent circuit parameters above.

 

Dealing with many measurement functions and algorithms have been integrated in a monolithic integrated circuit. Sentinel module can measure a single monomer battery, also measured on all 12V battery). Up to 250 measuring points are the forms module for measurement, the measurement results can be submitted by a data bus dedicated to the battery from the data recorder, S-Box. In the large-scale systems of the battery may be a few stocks such as data flow synthesis, which is a management system locally or remotely, can make use of the S-Box in the embedded web server through a standard bus or an Internet connection to use these data streams.

 

SOC by using measures to determine the actual status of each battery, not only can provide fault detection, near this sophisticated monitoring framework will be able to have functions; can also configure other functions and services. Aspire 3000 battery LCBTP03003

 

For example, the battery internal resistance within a single cell is usually different. Over time, this state will be a problem. SoC intelligent control system can quickly detect this single cell, the terminal voltage optimization system can be transferred can not continue to charge a single battery floating around the news…

 

Real-load time management can extend the battery life: In the voltage across the same situation, VRLA battery float in the current ratio flooded high-tech batteries. This may accelerate corrosion of the anode plate, which reduces the effective life of the battery up to 30%. On the life of a certain percentage of the float can be reduced to eliminate this bad effect. However, side effects such as the life cycle are also an advantage is to reduce the incidence of thermal runaway.

 

Installing a battery pack can also provide the full life cycle of the voltage and temperature records, that manufacturers and users use. Vostro 1510 battery Vostro 1520 battery

 

Over-discharge protection: The device in the charger / UPS systems are common, especially in the battery monitor, they are based on the average voltage of individual cells of the termination of the landfill to protect the battery. However, the poor performance of the voltage across the battery may be much lower than the average voltage in the battery, but also in its termination voltage is reached before the landfill was good. Therefore, the development of a dynamic high-accuracy ‘Time to Run (outstanding Running)’ algorithm, in any single cell will be depleted when an alert is given.

 

Monitoring of battery backup required parameter as detailed as possible in order to generate the most accurately reflects the results of the battery status. This is not just a technical problem, is also an economic issue. Avoid battery failure is essential, but replaced prematurely and did not even approach the end of the battery life is extremely profitable. In addition to the measurement of each battery voltage, impedance and discharge performance, LEM will also measure the internal temperature of the battery is defined as a standard feature, is a leading global position. LEM is currently developing a magnetic flux, the sensor technology is to float, with a resolution greater than 10mA, with little or no drift of temperature, high current discharge with almost no residual magnetism, the repeatability of measurements better. The integration of these advanced features, the battery monitor is more expensive systems, but the overall life of extreme cost-effective management system. Studio 17 battery Studio 1735 battery