BOOSTCAP® Product Guide - 24 Pages

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BOOSTCAP® Product Guide

Catalog excerpts

TABLE OF CONTENTS > 1. Description of Double Layer Capacitors 1.1 Theory 1.2 Construction 2. Typical Applications 2.1 Pulse Power 2.2 Bridge Power 2.3 Main Power 2.4 Memory Backup 3. Determining the correct ultracapacitor for the application 4. Specifications 4.1 Specification Descriptions 4.2 Measurement Conditions 4.2.1 Capacitance 4.2.2 Resistance 4.2.3 Leakage Current 5. Performance Characteristics 5.1 Temperature Effects, Initial Performance 5.2 Voltage and Temperature Effects on Life 5.3 Cycling 5.4 Frequency Response 6. Packaging 6.1 Typical Packaging 6.2 Shipping Regulatory...

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1.2 Construction The specifics of ultracapacitor construction are dependent on the application and use of the ultracapacitor. The materials may differ slightly from manufacturer or due to specific application needs. The commonality among all ultracapacitors is that they consist of a positive electrode, a negative electrode, a separator between these two electrodes, and an electrolyte filling the porosities of the two electrodes and separator. Electrolyte Separator 1 Description of Double Layer Capacitors 1.1 Theory Electrochemical double layer capacitors (EDLCs) are similarly known as...

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2.1 Pulse Power Ultracapacitors are ideally suited for pulse power applications. As mentioned in the theory section, due to the fact the energy storage is not a chemical reaction, the charge/discharge behavior of the capacitors is efficient. Since ultracapacitors have low internal impedance they are capable of delivering high currents and are often times placed in parallel with batteries to load level the batteries, extending battery life. The ultracapacitor buffers the battery from seeing the high peak currents experienced in the application. This methodology is employed for devices such...

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event notification. The ultracapacitors can be maintained at its full charged state and act as a power reserve to perform critical functions in the event of power loss. This may include AMR for reporting power outage, micro-controllers and board memory. > Determining the correct Ultracapacitor for the application > Determination of the proper capacitor and number of capacitors is dependant on the intended application. For sizing the system correctly a number of factors should be known. These factors include the maximum and minimum operating voltage of the application, the average current or...

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4 Specifications Product datasheets are available for each product. These datasheets are accessible at the Maxwell Technologies website, www.maxwell.com. This section will provide a definition for the specifications and the methods of measuring said conditions. 4.1 Specification Description Capacitance a measurement of energy storage in joules. C = qV Voltage ֖ the voltage provided in the specification is the maximum operating voltage for a single capacitor. The rated voltage is the voltage in which the performance data is measured. It is possible for the capacitors to experience voltages...

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Power, Pd gravimetric power density calculated between the ranges of a 20% to 40% voltage drop from the rated voltage. Life Time ֖ expected performance change for the ultracapacitor if held at rated voltage and 25 The resistance measurement considers all resistive components over approximately five time constants of the product and is inclusive of all resistive elements. The actual resistance measured would be lower if measured over a shorter duration than the 5 seconds indicated. > o C for 10 years. Cycle Life expected performance change after cycling 500k or 1M times (as specified on the...

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5 Performance Characteristics This section describes the behavior of ultracapacitors under operating conditions such as temperature, dc charging, cycling and frequency. The data is represented in product specific format where applicable. 5.1 Temperature Effects, Initial Performance The performance of Maxwell Technologies ultracapacitors is very stable over a wide operating temperature due to the chemistry and physical make up of the products. This behavior is common between all of the products lines due to the similar chemistry and construction. The following plot in figure 3 illustrates...

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o Figure 4: BCAP2600 Capacitance degradation at 2.7 V and 2.5 V at 65 C Figure 4 represents the expected capacitance degradation relative to the product specification. The plot, along with the fact that the influence of temperature has a doubling effect for every 10 > o C, can be used to predict the expected performance change for a variety of conditions. From this plot it is expected that a: 30% reduction in rated capacitance may occur for an ultracapacitor held at 2.7 V after 5,500 hrs @ 65 > o o C 11,000 hrs @ 55 > o C 22,000 hrs @ 45 > o C 44,000 hrs @ 35 > o C 88,000 hrs @ 25 C 15%...

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Figure 5: BCAP2600 Resistance degradation at 2.7 V and 2.5 V at 65 > o C Figure 5 represents the expected resistance degradation relative to the product specification. The plot, along with the fact that the influence of temperature has a doubling effect for every 10 > o C, can be used to predict the expected performance change for a variety of conditions. From this plot it is expected that a: 140% increase in rated resistance may occur for an ultracapacitor held at 2.7 V after 5,500 hrs @ 65 > o o C 11,000 hrs @ 55 > o C 22,000 hrs @ 45 > o C 44,000 hrs @ 35 > o C 88,000 hrs @ 25 C 40%...

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each charge/discharge cycle. The resulting duty cycle for this test is initially 70% reducing to approximately 50% at the product ages. The data provided is a combination of data points and extrapolation for the BCAP2600 product. > R 2.5 V > % C 2.7 V > Figure 6: Capacitance change vs. continuos cycling From Figure 6 it is seen that under the conditions described the product is expected to provide in excess of 1 million duty cycles with an approximate 20% reduction in rated capacitance. Notice in the 2.7 V cycle data the capacitance recovery during a stoppage in testing. This characteristic...

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