12V27A battery

　　What does a pure electric vehicle 12V27A battery consist of?

　　Composition of pure electric vehicle 12V27A battery

　　Power lithium batteries are composed of anode oxidation, negative electrode, electrolyte and diaphragm. However, the material is oxidized at the anode and the reducing agent is recovered at the negative electrode. If there is a continuous supply of steam natural substances (non-gas) on the anodizing process (i.e. the negative stage of the external circuit, also called the gas electrode) and a continuous supply of carbon dioxide (or gas) on the negative electrode, electrochemical corrosion will occur at the anode level. and current. Lithium-ion batteries differ from basic rechargeable batteries in that their raw materials and reducing agents are not stored in the rechargeable battery but in external tanks. When the rechargeable battery is working (including current and operation), the natural materials and reducing agents of the rechargeable battery must be continuously input and discharged. So, in the way it works, it's similar to a basic automotive gasoline or diesel generator. Due to the continuous supply of natural materials and reducing agents into rechargeable batteries, the natural materials and reducing agents used in power lithium batteries are liquids (gas or liquid). The most common natural materials are pure hydrogen, various hydrogen-containing gases (group gases) and some liquids (such as ethanol solutions). Common reducing agents are oxygen, gases such as purified indoor air, and some liquids such as hydrogen peroxide and sodium cyanide. solution.

　　The main purpose of anodizing power lithium batteries is to provide a general circuit for the electrolyte and a catalytic reaction for the oxidation of materials. The main purpose of the negative electrode (oxygen level) is to provide a common web for oxygen and the electrolyte of lithium batteries. Since most of the reactions on the power stage are reflected in the multi-component web, in order to increase the rate of chemical reactions, the power stage generally adopts a porous structure and is coated with a metal catalyst.

　　The main purpose of the electrolyte solution is to transport the positive ions present in the electrode reaction to the natural substance level and oxygen level, preventing the transfer of electronic devices between stages. The main purpose of the diaphragm is to transfer positive ions, block the immediate transmission of electrical potential in electronic devices and separate reducing agents and oxidizing agents. Therefore, the diaphragm must be a chemical that is resistant to erosion and insulation from the electrolyte solution and has good lubrication resistance.

　　Lithium battery pack

　　Pure electric vehicle lithium battery packs are composed of multiple series connections. A typical lithium-ion battery pack has approximately 96 rechargeable cells, and for a charged lithium-ion battery pack, the lithium-ion battery pack can now exceed the total operating voltage of 400v. Although the automotive switching power supply system uses lithium batteries as a single high-voltage rechargeable battery, all lithium batteries are charged and discharged every time, but the automatic control system must consider the status of each rechargeable battery. If one cell in a lithium battery pack is slightly less charged than the other, then after a few battery charge/charge and discharge cycles, the battery charge will slowly shift from the other cell. If the battery charge cannot be periodically balanced with other rechargeable batteries, it will eventually enter deep charge and discharge, causing damage and eventually causing the lithium-ion battery to fail together. To avoid this important operating voltage monitoring, the operating voltage of each rechargeable battery determines the state of charge. In addition, it is important to have a device that enables the charging unit to charge and discharge independently to balance the state of charge of the charging unit.

　　A key consideration in a lithium battery pack monitoring system is the serial communication interface. In terms of PC board communication, common choices include serial communication peripheral (spi) system bus and i2c bus. The communication cost of each system bus is very low and has little impact on the application environment. Another option is the control panel lan (can) system bus, which is widely used in automotive applications. The cane bus has strong robustness, test characteristics and common fault tolerance, but its communication cost and raw material cost are high. While the connection from the rechargeable battery system software to the car's main tank bus is very important, SPI or I2C communication from the lithium battery is a good alternative.

　　After the promulgation of the individual purchase subsidy standards for new energy vehicles and the promulgation of current subsidy policies in some large cities in demonstration sites, the consumption of new energy vehicles gradually began. In response to the broad industry prospects, major companies such as State Grid, China Southern Power Grid, China National Offshore Oil Corporation, and China Petrochemical Corporation have rushed to Maquan, and there is a boom in the construction of electric vehicle charging stations across the country.

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