Lithium battery
A primary battery that uses lithium metal or lithium alloy as the negative electrode material and uses a non-aqueous electrolyte solution, and is the same as a rechargeable lithium ion battery, it is different from lithium ion polymer batteries. The inventor of lithium batteries is Edison. Since the chemical properties of lithium metal are very active, the processing, storage and use of lithium metal are subject to very high environmental requirements. Therefore, lithium batteries have not been used for a long time. With the development of microelectronic technology in the late 20th century, the number of miniaturized devices has increased day by day, placing high demands on power supplies. Lithium batteries then entered the stage of large-scale practical use.
Product classificationts
Lithium batteries are generally divided into two categories:
Lithium metal batteries: Lithium metal batteries generally use dioxide A. battery using manganese as the positive electrode material, metallic lithium or its metal alloy as the negative electrode material, and using a non-aqueous electrolyte solution.
Lithium ion battery: Lithium ion battery generally uses lithium alloy metal oxide as the positive electrode material, graphite as the negative electrode material, and non-aqueous electrolyte.
Although the energy density of lithium metal batteries is high, it can theoretically reach 3860 watts/kg. However, because its properties are not stable enough and cannot be recharged, it cannot be used as a power bank for repeated use. Lithium-ion batteries are developed as bmain power battery due to their ability to be charged repeatedly. However, due to the combination of different elements, the performance of cathode materials varies greatly in various aspects, which has led to an increase in disputes on the choice of cathode materials in the industry.
Usually, the power batteries we talk about most are lithium iron phosphate batteries, lithium manganate batteries, lithium cobalt oxide batteries and ternary lithium batteries (ternary nickel cobalt manganese ).
Conductive coating
Conductive coating is also called pre-coating In the lithium battery industry, it generally refers to the coating on the collector current of the positive electrode. aluminum foil. A layer of conductive coating on the surface. The aluminum foil covered with a revConductive material is called pre-coated aluminum foil or simply coated aluminum foil. Its first experiments in the field of batteries date back to the 1970s. new energy industry, in particular, the development of lithium iron phosphate batteries has become popular and has become a popular new technology or new material in the industry.
Does the battery have “line protection”?
The negative pole of the lithium battery circuit board of the electric hand drill cannot be powered directly. There is no necessary relationship between the direct connection of the positive and negative poles and whether or not you receive an electric shock. In other words, you start from the positive pole of the power supply and follow the wire to the negative pole. electrical appliances in the middle. Note that the closed switch is used as a wire and not as an electrical device. The reResistance of the ammeter is very low and it also acts as a wire.
The emergence of battery protection circuits was only popularized in the past fifteen years, because the energy of ordinary household batteries was relatively low and there was no risk of explosion, circuit protection was not ensured. . The continuous development of science and technology and actual needs have produced a new generation of rechargeable lithium batteries. The energy of the same battery volume increased by more than five times, and the instantaneous discharge energy. The amount is also alarming. A short circuit in the battery will generate high heat and explode. In addition to protecting user safety, there is another important reason for adding a protection circuit: the charging and discharging process of lithium batteries is extremely strict. Improper use may cause them touseless. upper limit is 4.2V), cannot be over discharged (lower limit 2.2V), these tasks are all accomplished by the protection circuit board, so in addition to short circuit protection , the battery itself is also protected. If it's not a rechargeable lithium battery, there's no real need for this device. Of course, you can add it according to your preferences, but it's really not necessary.
Reference: Industry Workers
All batteries purchased on the market must have safety protection. The protection varies from manufacturer to manufacturer, in general the protection is intended for the user to avoid danger when loading. inappropriately. Each battery has a hidden roar outside the battery case. When your battery has a problem, it will break down and release pressure to prevent an explosion. It is not thisrtain that it can be used to make any type of battery. According to current science, this is not possible at the moment.
Generally, cell phone lithium batteries have built-in electronic protection circuits (original factory) to prevent overcharging! Can we make any battery? If necessary, yes!