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<title> Smart metering application environment on the high and low temperature performance of lithium batteries in Asia called for the adoption of the Energy Technology Co., Ltd Puyang Maiqi batteries in smart metering applications, the temperature characteristics of simulations and found that high-temperature electrical properties of the environment likely to cause the compaq presario v2000 laptop battery failure, and may cause leakage, explosion and other accidents. Therefore, the battery temperature characteristics must serve as an important indicator of battery performance appraisal, including different temperature discharge performance, high temperature storage properties, resistance to temperature impact properties.
1 Introduction For the smart metering, whether it is electricity meters, water meters, gas or heat meters, they all require the use of battery power as the real-time clock, memory back-up power supply or power supply.
Among the many cell types, since the lithium thionyl chloride battery has the longest storage life and service life, high specific energy, the most wide operating temperature range (-55 ? ~ +85 ?) and other characteristics (special design and manufacture of high-temperature battery the use of temperatures up to 150 ?), has become the first choice for a variety of smart metering cell types. The battery temperature characteristics reflect the reliability of the battery, which in addition to urging the battery has a wide operating temperature range, also called the battery has a good resistance to high and low temperature impact properties, high temperature storage performance of lithium-thionyl chloride MYJ brand batteries (abbreviated Li-Ya batteries), after a series of technical innovations and improvements, so that the battery temperature adaptation has been greatly improved.
2 Meter application of environmental temperature on the requirements of the battery temperature characteristics
2.1 meter high-temperature environment, the process of using the ambient temperature varies greatly. According to the user reflects wire rod hanging in the outdoor meter box, in the south of the summer box extreme temperatures up to 80 ?; a number of countries in the Middle East temperature reached 50 ?, the meter box can reach temperatures of about 80 ? or so. So, for the battery meter in the temperature performance, and for ensuring the normal operation of smart metering is essential, complex application environment has also made the battery temperature performance of a higher demand. The battery temperature adaptability will become smart metering evaluation is particularly important with the battery performance indicators. High temperature will cause the battery internal pressure increases, volume expansion, steel deformation and electrolyte leakage effects, due to the acceleration of electrochemical reaction, the internal liquid circulation can also cause the battery self-discharge speed and acceleration. From the practical application of environmental considerations, the battery temperature limits designed to reach 85 ?, the design temperature is too low will lead to significantly shorten the battery's working life, working life meter will not be guaranteed. This requires the design of the battery must be fully studied the impact of high temperature on battery performance.
2.2 The low-temperature environment in the northern cold areas, the limit temperature may be as low as -40 ? below. In such a low temperature, because the electrochemical reaction rate is down, the battery current and voltage output will drop, the discharge capacity will be substantially reduced. In addition, the battery components in particular, the glass insulator at very low and extremely high temperatures under the impact of excessive deformation, which may cause cracks and leakage insulators.
2.3 MYJ lithium battery operating temperature range of Sub-MYJ Lithium battery through the positive modification methods such as electro-hydraulic additives to improve the battery in high and low temperature environment, electrical properties, so that the temperature of the battery the scope can reach -55 ? ~ +85 ?. In the context of the test ER14250C-type meters dedicated battery 10mA discharge curves of different temperatures shown in Figure 1. As can be seen from Figure 1, the temperature as low as -40 ?, up to +85 ?, discharge can get good results.
3 battery meter high-temperature failure of influence in 1972, the U.S. Sandia National Laboratories (http://www.sandia.gov) commitment to the U.S. Department of Energy, NASA and nuclear safety committee commissioned to conduct accelerated testing battery life evaluation model studies have concluded that the high temperature storage acceleration test can quickly evaluate the reliability of the battery, the results conclusions are Japan, Israel proved the battery manufacturers, and in 1994 received the U.S. "President Award." The principle of this conclusion is: at high temperatures, chemical reaction faster, the battery within the wide range of chemical reactions to accelerate, according to Van't Hoff's law, the temperature is increased by 10 times, the chemical reaction rate increased by 2 ~ 4 times. According to the chemical reaction kinetics, and battery production practice is generally believed that the battery stored at 60 ? for the equivalent of 200 days at room temperature and stored for 10 years. Is usually in the microampere level micro-current of the battery case of the working hours are generally more than 10 years, which in fact means that the battery is basically in storage. We are in high-temperature acceleration test study, found that some of the battery failure will occur (the discharge capacity of less than 50% lower than the normal capacity), which means that you should use a 10-year HP PAVILION ZE5000 Laptop Battery in 3 to 5 years began ineffective. Some cell users is also reflected in some of the brand in the process of early battery failure case. This problem is very serious, so we high-temperature storage battery when the failure rate of assessment and evaluation as a key indicator of battery performance. We are targeting high-temperature storage battery failure when the issue of a special study made, including battery design, technology and other additives, a series of new technological achievements, making MYJ the introduction of new technology batteries, the battery storage at high temperatures speed up the failure of tests does not occur. Test temperature of 60 ? is a relatively low temperature, as a matter of fact, in the actual use environment temperature of 60 ? is easy to achieve, such as smart meters factory pre-aging temperature in general is about 60 ?. Even if only a few hours a day of high-temperature environments, coupled with changes in temperature brought about a negative effect, will cause the poorly designed battery storage life significantly reduced. As the magnitude of the problem, and foreign famous brands to the battery cells to assess the high temperature storage test temperature increased to 72 ?.
4 Effect of temperature on the battery to improve the security of Europe and the United States and its lithium-ion batteries sold in developed countries are required to pass UL safety certification.
UL1642 standard is a common lithium battery safety standards, safety performance of the test items have multiple test items related to temperature: high temperature cycling, thermal shock, high temperature short-circuit and short-circuit test at room temperature and so on. Similarly, the United Nations (UN) recommended transportation safety testing and certification program also includes the temperature of the test items, such as high-temperature experiment, which shows that the temperature of the battery meter in the safety performance of a very significant impact. MYJ is an international one of the few UL safety certification through the whole series, UN transport sub-cell lithium-certified brands. Temperature on the battery will primarily affect the safety performance of the battery deformation (like a drum at the end, expansion, etc.), leakage, explosion, resulting in malfunctioning meter, corrosion and equipment damage. MYJ Lithium batteries adopt a safe design of the new sub-technologies on the safety performance of batteries designed for specific improvements, achieved good results. Table 1 MYJ Lithium batteries with a sub-brand batteries in turn stored in different temperature occurred after deformation, leakage situation. Table 1 1/2AA lithium batteries in Asia by the temperature shock, comparing temperature deformation (?) (stored 6h) MYJ Lithium batteries Asia (50) A well-known brand battery (50) 80 No change No change two drums at the end of 100 5 drums at the end, a leakage 5 Conclusion lithium battery temperature characteristics of smart sub-metering applications for a relatively big impact, when the smart metering applies to high-temperature environment, the poor design of the battery will not be able to ensure the discharge performance at high temperature , it may cause leakage and other security incidents. The temperature performance of the battery meter has become a range of applications affecting an important factor in the need for careful selection of the appropriate temperature with the use of the battery. MYJ Lithium battery organized a special research team for the application of various types of smart metering trials and studies carried out, and accumulated considerable wealth of experience. In order to better development of lithium batteries in sub-meter in depth and breadth of the application, we welcome the meter manufacturers and we have to discuss related IBM THINKPAD R40 Laptop Battery.
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