With the continuous development of positive and negative materials for insulating plate lithium batteries and the continuous maturity of technology, lithium batteries will play a role in the era of electric vehicles. According to the shell form, lithium batteries can be divided into three categories: cylindrical cells, square cells and flexible packaging series. Cylindrical cells are generally packaged. Tesla models use a type-packaged lithium cobalt oxide battery. Square cells are also known as hard packaging. The structure generally includes: battery upper and lower covers, positive diaphragm negative electrolyte, and steel or aluminum battery shell soft packaging structure. The structure is similar to hard packaging, including: positive diaphragm negative electrolyte and aluminum-plastic composite film battery. shell. The advantages and disadvantages of each type are shown in the table. According to different positive materials, lithium batteries can be divided into many types. The mainstream applications are: lithium cobalt oxide battery, lithium manganate battery, lithium iron phosphate battery, and ternary lithium battery.

Lithium cobalt oxide battery Lithium cobalt oxide battery has a stable structure, high capacity ratio, high comprehensive performance, outstanding electrochemical performance, excellent processing performance, excellent tap density called the voltage. General cobalt oxide battery. The positive lithium cobalt oxide battery is lithium cobalt oxide polymer, and the negative material is graphite. The charge and discharge characteristics of the lithium cobalt oxide battery. It can be seen from the figure that the termination voltage of the lithium cobalt oxide battery during charging is: when the lithium cobalt oxide battery is discharged, the voltage will drop rapidly in the future, and the small discharge termination voltage is about. The battery cell of the Tesla power battery adopts a battery with a capacity of about 100%. There are several cells in parallel to form a group, the group is connected in series to form a layer, and the layers are connected in series to form a power battery. The voltage of the power battery is lithium cobalt oxide. The battery pack composed of lithium cobalt oxide batteries, together with dual motors and electronic control system, accounts for at least the price of the whole vehicle, and the cost is high; secondly, the thermal stability is poor, and the insulating plate will release oxygen and a lot of heat when it encounters high temperature or impact. Based on the above shortcomings, lithium ion oxide batteries are mainly used in small and medium-sized batteries, and are widely used in small electronic devices such as notebook computers and computers. Only Tesla uses this type of power battery in electric vehicles.

Lithium manganate battery Lithium manganate battery refers to a battery that is using lithium manganate material. Compared with traditional positive materials such as lithium cobaltate, lithium manganate has the advantages of abundant resources, low cost and good performance. Lithium manganate is positive using spinel type lithium manganate and layered lithium manganate, generally negative is graphite. its nominal voltage is reached. Lithium manganate battery. The charge-discharge curve of lithium manganate battery. , when the lithium manganate battery is charged, the curve is relatively flat, and the charging screenshot of the lithium manganate battery is about the limit voltage; when the voltage is lower than the discharge, it will drop rapidly. The discharge cut-off voltage is Dongfeng Nissan Qichen Chenfeng, and the battery technology used is Lithium manganate batteries are widely used in the market today. The electric vehicle power battery pack is composed of a single battery cell, the battery capacity is 100, which generally needs to be fully charged on the left and right sides, the driving range is 100, and the total mass is less than The lithium manganate battery material itself is not very stable, and it is easy to generate gas, so it is mostly used in combination with other materials to reduce the cost of the battery cell, but its cycle life decays rapidly, it is prone to bulge, its high temperature performance is poor, and its life is relatively short. , mainly used for large and medium-sized batteries. Lithium iron phosphate battery Lithium iron phosphate battery refers to a lithium battery that uses lithium iron phosphate as a positive material.