What is the battery explosion how to prevent the battery?
The solid material of any part of the instantaneous discharge, is pushed to the distance from the battery more than 25 cm, called the explosion. Discriminant battery explosion or not, the experiment using the following conditions. Will cover a network experiment batteries, battery in the middle of, any side is 25 cm from the net. Network density of root/cm, 6 and 7 cables with soft aluminium wire diameter is 0.25 mm, without solid part through the net, if the experiment proved that the battery was not an explosion. Lithium batteries in series
Due to the battery in the process of production, from film to become a finished product should pass a lot of working procedure. Even after the strict test procedure, make each group of the power supply voltage, resistance, capacity is consistent, but the use of a period of time, also can produce the difference of this or that. As a mother gave birth to twins, newborn may be identical, as a mother is difficult to distinguish. However, when two children grow, can produce this or that the difference of lithium power battery and so on. Use after period of time have differences, adopt the way of the voltage control is difficult to apply to lithium power battery, such as a 36 v battery pile, must use 10 batteries in series. Overall charge control voltage is 42 v, and discharge the control voltage is 26 v. With overall voltage control method, the initial use phase due to battery consistency especially good, perhaps there will not be any problem. In use for a period of time after the battery internal resistance and voltage fluctuations, forming an inconsistent state, (inconsistent is absolute, consistency is relative) this time still use whole voltage control can‘t achieve the goal. For example, only 10 battery discharge when the two of them the battery voltage is 2.8 V, four of the battery voltage is 3.2 V, four is 3.4 V, now the overall voltage is 32 V, we let it continue to discharge work till 26 V. In this way, the two 2.8 V battery is lower than 2.6 V in the discharge condition. Lithium battery discharge is equal to scrap. On the other hand, with the overall way to control the charging voltage to charge, also can appear overcharge. Such as the above 10 battery charging voltage condition at that time. Overall voltage to 42 V when the two 2.8 V batteries in the "hunger" state, and rapid absorption power, will be more than 4.2 V, and more than 4.2 V battery overcharge, not only because of the high voltage to produce scrap, even dangerous, this is the characteristics of lithium power battery.
The lithium ion battery of the rated voltage of 3.6 V (some products of 3.7 V). Fully charged when the termination of charging voltage related to battery anode material: 4.2 V for graphite anode materials; Anode material for coke 4.1 V. Different internal resistance of the anode materials are also different, coke anode resistance slightly larger, its discharge curve also slightly different, as shown in figure 1. Commonly referred to as 4.1 V lithium ion battery and 4.2 V lithium ion battery. Now use the most is 4.2 V, the termination of lithium ion battery discharge voltage of 2.5 V to 2.75 V (battery or termination of the discharge voltage, voltage range is given the parameters is slightly different). Below terminate discharge voltage continue to discharge called discharge, discharge the battery will be damaged.
Portable electronic products with battery as a power source. With the rapid development of portable products, all kinds of the dosage of the battery, and developed many new type of battery. In addition to all the familiar of high-performance alkaline batteries, rechargeable nickel cadmium battery, nickel metal hydride batteries, and in recent years, the development of lithium battery. This paper mainly introduces the basic knowledge of the lithium battery. Including its features, main parameters, the type, application scope and the significance of using matters needing attention, etc.
Lithium is a kind of metal elements, chemical symbol for Li (the English called lithium), is a silvery white, very soft and lively metal chemical performance, is the lightest in the metal. It besides used in atomic energy industry, can manufacture special alloy, special glass (TV screen glass) and lithium batteries. It is used as the battery in the lithium battery anode.
Lithium-ion batteries are divided into two categories: not charging and rechargeable ones. Non-rechargeable batteries as disposable batteries, it can only be chemical energy into electrical energy at once, can‘t electricity revert to chemical energy (or reduction performance is poor). The rechargeable battery is called secondary battery (also known as the battery). It can transform electric energy into chemical energy storage, when using, and then convert chemical energy into electrical energy, it is reversible, such as the main characteristics of electricity chemical energy lithium batteries.
Poach portable electronic products required size filial piety light weight, but the size and weight of the battery compared with other electronic components is often the biggest and the heaviest. Think that year, for example, "big brother" is quite "thick and heavy", today‘s cell phone is so light. Has played an important role in cell of improvement is: the past is nickel cadmium battery, is now a lithium-ion battery.
The biggest characteristic of the lithium battery is higher than the energy. What is the specific energy? Refers to the unit weight than energy or energy per unit volume. Specific energy with Wh/kg and Wh/L. Wh is the unit of energy, W is a W, h is hours; Kg is kg (weight unit), L is rising (volume unit). Here take an example to illustrate: 5 nickel cadmium battery rated voltage for 1 to 2 v, its capacity is 800 mah, its energy is 0 96 wh (1, 2 v x 0 8 ah). The same size 5 lithium - manganese dioxide battery rated voltage is 3 v, its capacity is 1200 mah, its energy is 3 6 wh. Both the volume of a battery is the same, then the lithium - manganese dioxide battery than energy is 375 times of the nickel cadmium battery!
Section 5 about 23 g nickel-cadmium batteries, lithium and section 5 - about 18 g heavy manganese dioxide battery. - section lithium manganese dioxide battery is 3 v, and two nickel cadmium battery only 2 to 4 v. So using lithium battery cell number (make less portable electronic product volume reduction of filial piety weight), and long working life of the battery.
In addition, the lithium battery has a stable discharge voltage, wide working temperature range, low self-discharge rate and long storage life, no memory effect, and pollution-free advantages.
The shortcoming of the lithium battery is expensive, so it is not widely used, mainly used in handheld computers, PDA, communications equipment, camera, satellite, missile, torpedo, instrument, etc. With the development of technology, process improvement and the increase of the production, the price of lithium battery will decrease continuously, applications will be more common.
