Electric vehicle lithium battery management system design new program - Power Circuit - Circuit Diagram

With the shortage of energy, rising oil prices, and increasingly serious urban environmental pollution, the development and utilization of new energy alternatives to petroleum is increasingly valued by governments. In the new energy system, battery cells

A battery is a device for energy conversion and storage that converts chemical or physical energy into electrical energy. A battery is a kind of chemical power source. It consists of two different compositions of electrochemically active electrodes, which are composed of positive and negative poles soaked to provide media conduction. When connected to an external carrier, the internal chemistry is converted. Can provide power. [full text]

The system is an indispensable part of it. In recent years, a lithium battery lithium battery lithium battery is a battery using a lithium metal or a lithium alloy as a negative electrode material and a nonaqueous electrolyte solution. Its most remarkable feature is that it has no memory, and successfully solves the problem that the traditional battery has a short life span due to memory; it is convenient for people to charge time. [full text]

Powered electric bicycles, hybrid vehicles, electric vehicles, fuel cell vehicles, etc. have received more and more attention from the market. The application of power batteries in the transportation field is of great significance for reducing greenhouse gas emissions, reducing air pollution and the application of new energy sources. Lithium batteries have attracted more and more attention due to their high energy density, high repetition rate, light weight and green environmental protection. Therefore, they have been widely used in portable handheld devices such as mobile phones, notebook computers and power tools. Has begun to enter high-power applications such as electric vehicles and electric vehicles, becoming a hot spot in the development of electric vehicles worldwide.

However, due to the heating, overcharge/over-discharge current, vibration, extrusion and other abuse conditions, the lithium battery may cause the battery life to be shortened and damage, and even fire, explosion and other events may occur. Therefore, the safety problem becomes a commercialization of the power lithium battery. The main constraints. Safe, low cost, long life lithium ion battery lithium ion battery

Lithium-ion batteries, which are now widely used by everyone, are developed from lithium batteries. So before we get to know the lithium-ion battery, let's introduce the lithium battery. For example, the button battery used in the previous camera was a lithium battery. The negative electrode material of the lithium battery is lithium metal, and the positive electrode material is carbon material. According to the customary naming rules, we call this battery a lithium battery. The positive electrode material of the lithium ion battery is lithium cobalt oxide, and the negative electrode material is carbon material. The lithium ion generated by the battery through the positive electrode is embedded and moved out in the negative carbon material to realize the charging and discharging process of the battery. In order to distinguish it from the lithium battery in the conventional sense, it is called a lithium ion battery. [full text]

Safety standards, safety* price methods, safety and reliability control of the battery manufacturing process, and improvement of battery safety and reliability through positive and negative materials, electrolytes and diaphragms are key to ensuring safe, reliable and practical operation of large-power lithium-ion batteries. . As the core component of battery protection and management, the battery management system not only needs to ensure the safe and reliable use of the battery, but also to fully utilize the battery capacity and extend the service life. As a bridge between the battery and the vehicle management system and the driver, the battery management system It plays an increasingly important role in the performance of electric vehicles.

Main functions of the battery management system

The battery management system is closely integrated with the power battery of the electric vehicle to detect the voltage, current and temperature of the battery at the same time. At the same time, it also conducts leakage detection, thermal management, battery balance management, alarm reminder, calculation of remaining capacity, discharge power, and report. SOC&SOH state, according to the voltage, current and temperature of the battery, the maximum output power is controlled by algorithm to obtain the maximum mileage, and the optimal current is charged by the algorithm to control the charging of the charger through the CAN bus.

A bus is a group of transmission lines that carry information as one or more source components to one or more destination components. In layman's terms, a common connection between multiple components is used to transfer information between components. The bus frequency is often described in terms of speed in MHz. [full text]

The interface communicates with the vehicle master controller, motor controller, energy control system, and vehicle display system in real time. Figure 1 is a simplified block diagram of a battery management system.

Figure 1: A simple block diagram of a battery management system.