Reasons for Matsushita Battery Not Reaching Service Life

Although today Panasonic batteries have made great improvements in structure design and use of raw materials, and their performances have been greatly improved. The theoretical life of many well-designed and well-used maintenance-free Panasonic batteries for floating charging is more than 15-20 years, but the batteries that can really achieve such life in use are probably: Few. To find out the reasons, we think there are the following points:



1)



There are two reasons that affect the service life of Panasonic batteries:



1) Lead-acid batteries have stringent requirements for charging equipment when ambient temperature changes. Due to the design defects of the charging equipment in the past, the normal service life of the battery is affected.



2) After the discharge of lead-acid batteries, due to the inconvenience of charging equipment in the past, the users can not replenish the battery in time. The damage is to shorten the battery life greatly.



It is found that the battery charging process has the greatest impact on the battery life, while the discharge process has less impact. That is to say, the vast majority of batteries are not damaged, but "charged and damaged". Therefore, we must pay attention to the use of the process. Obviously, it is impossible for lead-acid batteries in daily use to stay in the environment for a long time. There are still early, mid and late temperature variations in a day, not to mention the larger temperature differences in spring, summer, autumn and winter in a year. Therefore, various thyristor rectifiers, transformer step-down rectifiers and general types are widely used in the market at present. Lead-acid battery charger with switched voltage regulator. Charging batteries with constant voltage or current can not meet the strict technical requirements for supplementary charging of lead-acid batteries. Throughout the past, these methods of charging lead-acid batteries and the lead-acid battery chargers developed according to these methods are reviewed. It is not difficult to see that its technology is not perfect enough to charge Panasonic batteries with these products, which is bound to directly affect the life of lead-acid batteries. At the same time, there are still some problems in these chargers, such as narrow working voltage range, large volume, low efficiency, poor safety factor and so on. The design of charging equipment is not perfect and its use is inconvenient.



2) Panasonic batteries can not be recharged in time after discharge, especially when overdischarge causes fatal damage to batteries.



3) The products of a few manufacturers are inferior in quality and inferior in quality.



For the above reasons, we believe that the second and third points are technically easy to prevent and do well, but the first point involves technical problems that are relatively difficult to solve. The following focuses on the existing problems in this regard.



2. Technical Requirements for Battery Charging



The technical specifications for ensuring the service life of Panasonic batteries provided by the manufacturer are given at ambient temperature of 25 C. When the ambient temperature is constant, the charging voltage is 100 mV higher than the required voltage, and the charging current will increase several times. Therefore, it will lead to thermal runaway and overcharge damage of batteries. When the charging voltage is 100 mV lower than the required voltage, the battery will be undercharged, and the battery will also be damaged. In addition, the capacity of Panasonic batteries is also related to temperature. The manufacturers require users of Panasonic batteries to charge in time after releasing 50% of their rated capacity in summer and 25% in winter.