18650 battery 3.7v 2200mah

　　How exactly does a 18650 battery 3.7v 2200mahmanagement system work?

　　1. Compared with 18650 battery 3.7v 2200mahlife anxiety, the safety anxiety of pure electric vehicles is a topic that car owners are more concerned about.

　　2. Data shows that 80% of spontaneous combustion accidents of new energy vehicles occur during charging or within 1 hour after being fully charged.

　　3. The thermal management effect of new energy vehicles will affect more than 40% of the 18650 battery 3.7v 2200mahlife.

　　Those car buyers who ignore the safety of the 18650 battery 3.7v 2200mahand blindly only focus on the data of "high cruising range" and "high energy density" will really regret it one day.

　　If fires caused by charging can be effectively avoided, the safety accidents of electric vehicles will be greatly reduced. At this time, we need to understand BMS.

　　BMS (18650 battery 3.7v 2200mahmanagement system) is an indispensable and important component of electric vehicles. It is the hub for managing and monitoring power batteries. It manages, maintains, and monitors each 18650 battery 3.7v 2200mahmodule. It is responsible for preventing 18650 battery 3.7v 2200mahovercharge and overdischarge, extending 18650 battery 3.7v 2200mahlife, and helping batteries to function properly. The task of running.

　　The 18650 battery 3.7v 2200mahmanagement system (BMS) is an important link between vehicle batteries and electric vehicles. Its main functions include: real-time monitoring of 18650 battery 3.7v 2200mahphysical parameters, 18650 battery 3.7v 2200mahstatus estimation, online diagnosis and early warning, charge and discharge and precharge control balance management, thermal management, etc. wait. If any of the above functions is not implemented well, it will cause fatal harm to the battery.

　　What are the mainstream BMS supporting companies?

　　Let’s take a look at which manufacturers provide the BMS for the current mainstream domestic pure electric vehicles?

　　As an important link connecting the 18650 battery 3.7v 2200mahpack, vehicle system and motor, BMS is the core technology of the power 18650 battery 3.7v 2200mahpack and the most important indicator to measure the performance of a pure electric vehicle.

　　The complexity of the BMS system determines that it has strong technical barriers and requires technology research and development time. Its cost accounts for about 20% of the total cost of the 18650 battery 3.7v 2200mahpack.

　　BMS companies in my country are generally divided into several types: self-operated by 18650 battery 3.7v 2200mahfactories, self-operated by vehicle manufacturers, and operated by third parties.

　　For self-operated 18650 battery 3.7v 2200mahfactories, the current first-tier power 18650 battery 3.7v 2200mahcompanies in China include CATL, CITIC Guoan, Guoli, Guoxuan Hi-Tech, Microvast Power, etc. They have mastered a complete set of core technology advantages and have strong market competitiveness;

　　Those that are self-operated by OEMs, represented by BYD, BAIC New Energy, and Zhongtong Bus, not only master core technologies but also have advantages over other companies in terms of cost;

　　Representative companies provided by third parties include Dongguan Juwei Power, Huizhou Yineng Electronics, Shenzhen Kelie Technology and other companies.

　　Let’s take a look at the ranking of companies currently supporting BMS for mainstream new energy vehicles (Top 20 BMS installed capacity of new energy vehicles in September 2019). Most of the BMS for domestic pure electric vehicles we purchase comes from these companies. After reading I believe this installed capacity data will also be of great help to your purchase of pure electric vehicles.

　　How important are the functions of BMS?

　　BMS is the lifeblood of electric vehicles!

　　BMS is the link between the 18650 battery 3.7v 2200mahand the vehicle. The signals it handles are rich enough, including: 18650 battery 3.7v 2200mahcell, collision, CAN, charging, water pump, high voltage, insulation, etc. One over-discharge will cause permanent damage to the battery. In extreme cases, overheating or overcharging of the lithium 18650 battery 3.7v 2200mahcan lead to thermal runaway, 18650 battery 3.7v 2200mahrupture or even explosion. Therefore, BMS must strictly control charging and discharging to avoid overcharging, over-discharging, and overheating.

　　Batteries have different working performance at different temperatures. The optimal working temperature of lithium-ion batteries is 25-40 degrees. BMS improves inconsistency through equalization and improves the overall performance of lithium batteries.

　　Electric vehicles use lithium batteries as their main power source. Lithium batteries have the advantage of high energy density, so their performance is relatively stable. However, the quality of lithium batteries is not easy to control when mass-produced. There are slight differences in 18650 battery 3.7v 2200mahpower when the 18650 battery 3.7v 2200mahcells leave the factory. As the operating environment changes and other factors, the inconsistency between batteries will become more and more obvious, and the 18650 battery 3.7v 2200mahefficiency and lifespan will also deteriorate. In addition, Overcharging or over-discharging may lead to fire and other safety issues in severe cases.

　　The BMS can accurately measure the usage status of the 18650 battery 3.7v 2200mahpack, protect the 18650 battery 3.7v 2200mahfrom overcharging and discharging, balance the power of each 18650 battery 3.7v 2200mahin the 18650 battery 3.7v 2200mahpack, and analyze and calculate the power of the 18650 battery 3.7v 2200mahpack and convert it into understandable endurance information to ensure the safety of the power battery. operation.

　　BMS battle: Tesla Model 3 versus Chevrolet Bolt

　　Without a good BMS, an electric car is a mobile bomb!

　　The main purpose of the 18650 battery 3.7v 2200mahmanagement system is to ensure the design performance of the 18650 battery 3.7v 2200mahsystem and provide functions from three aspects: safety, durability, and power. In terms of safety, the BMS 18650 battery 3.7v 2200mahmanagement system can protect 18650 battery 3.7v 2200mahcells from damage and prevent safety accidents; in terms of durability, the BMS 18650 battery 3.7v 2200mahmanagement system can make the 18650 battery 3.7v 2200mahwork in a reliable and safe area and extend the service life of the battery; in terms of power, , to maintain the battery's working condition to meet vehicle requirements.

　　Tesla's 18650 battery 3.7v 2200mahmanagement system is the most mature system available today. It benefits from the full application of deep learning and artificial intelligence. Tesla's BMS can continuously obtain big data of actual driving and then self-strengthen the algorithm, thus making the 18650 battery 3.7v 2200mahlife of Tesla's 18650 battery 3.7v 2200mahpack relatively longer.

　　Let’s take Tesla Model 3 as an example and list the five major features of its BMS:

　　1.4416 low-capacity small batteries support the 75kWh system, and a large number of small cells make the 18650 battery 3.7v 2200mahsystem more stable.

　　2. Although the batteries are purchased, Tesla develops its own management system to manage the temperature of each 18650 battery 3.7v 2200mahcell.

　　3. Use a two-stage method for cell balancing to achieve higher 18650 battery 3.7v 2200mahutilization efficiency and a relatively low attenuation speed.

　　4. Tesla reduces the relative flammability of NCA batteries by using non-thermally conductive materials and embedded thermometers.

　　5. Tesla accumulates BMS-related experience data: driving, charging, 18650 battery 3.7v 2200mahtemperature, 18650 battery 3.7v 2200mahcapacity changes, etc.

　　The five major features of Tesla BMS bring many advantages:

　　1. Most electric cars’ 18650 battery 3.7v 2200mahcapacity drops below 80% within 4-8 years, while most Teslas maintain above 90%.

　　2. Tesla BMS has a high risk tolerance and makes maximum use of big data to maintain and manage a large number of 18650 battery 3.7v 2200mahcells.

　　3. The Tesla system can use the same 18650 battery 3.7v 2200mahto satisfy cars, trucks, sports cars, SUVs or other types of vehicles.

　　In addition to the obvious advantages, the weaknesses of Tesla 18650 battery 3.7v 2200mahpacks are also obvious:

　　1. The safety of 18650 battery 3.7v 2200mahcells is relatively poor: both Model S and Model

　　2. Module replacement costs are high: Some damaged cells will not affect the overall performance of the 18650 battery 3.7v 2200mahpack, but damaged modules are more expensive to replace.

　　3. There is a risk of instantaneous loss of control: Once there is a short-term power loss, the power control system cannot be activated in time, which will cause the safety protection and temperature control functions to fail.

　　On the sales list of new energy vehicles in the United States, apart from Tesla, which is far ahead, it is Chevrolet's Bolt. Compared with Tesla’s BMS, Chevrolet Bolt’s BMS has the following characteristics:

　　1. The chip that monitors voltage and temperature in BoltBMS is not developed by itself. It is designed by LG Chem and produced by ST Microelectronics.

　　2. Bolt has 25 BMSMCUs and Model3 has 18.

　　3. Bolt only has a single-stage cell balance. If the 18650 battery 3.7v 2200mahcapacity is increased, the cell balance accuracy will be unbalanced, resulting in faster decay.

　　Taken together, we can definitely draw the conclusion that Tesla's BMS is indeed very excellent.

　　How important is a battery’s thermal management system? Which car companies are using air cooling, liquid cooling, and direct cooling?

　　Winter is coming, what should we do with pure electric vehicles?

　　According to statistics, when an electric vehicle turns on the air conditioner under severe working conditions (especially low temperatures in winter), it will affect more than 40% of the vehicle's endurance. Therefore, compared with traditional fuel vehicles, the comprehensive energy management of pure electric vehicles is particularly important. Here we will give a detailed introduction to the thermal management system of new energy vehicles.

　　According to different heat transfer media, 18650 battery 3.7v 2200mahthermal management systems can be divided into air cooling, direct cooling, and liquid cooling. Liquid cooling is lower in cost than direct cooling, and the cooling effect is better than air cooling. It currently has a trend of mainstream application. The thermal management system of new energy vehicles has a decisive impact on cruising range and 18650 battery 3.7v 2200mahlife.

　　The key objects of thermal management of new energy vehicles are air conditioning systems, 18650 battery 3.7v 2200mahpack management systems, motor electronic control management systems, etc. The optimal temperature for 18650 battery 3.7v 2200mahoperation is between 0-38°C. At this time, there is no need for heating or cooling. Too high or too low temperature will cause the 18650 battery 3.7v 2200mahlife to decay faster. Therefore, the 18650 battery 3.7v 2200mahneeds to be evenly temperature managed.

　　Different types of vehicles adopt different thermal management systems. The essence of thermal management is three strategies: cooling, insulation and heating. At present, the thermal management system of new energy vehicles mainly focuses on cooling. Distinguished according to the cooling medium, the ones with relatively low efficiency and cost include air cooling and liquid cooling. Air cooling is the main application of new energy thermal management systems and was widely used in early electric passenger vehicles. Liquid cooling is currently the most widely used new energy thermal management system. It uses liquid convection heat exchange to take away the heat generated by the 18650 battery 3.7v 2200mahto achieve cooling purposes. Domestic and foreign classic BMW i3, Tesla, Chevrolet Volt, Zino, Geely Emgrand and other models all adopt this technical route.

　　There is also a type of direct cooling used in mid-to-high-end models. It uses the principle of latent heat of refrigerant evaporation to establish an air conditioning system in the entire vehicle or 18650 battery 3.7v 2200mahsystem. The refrigerant evaporates in the evaporator and quickly and efficiently transfers the heat from the 18650 battery 3.7v 2200mahsystem. Go ahead and finish the job of cooling the 18650 battery 3.7v 2200mahsystem. The BMW i3 has two cooling solutions: liquid cooling and direct cooling. Direct cooling has the highest power, but the control strategy is the most difficult to implement. It is more suitable for high 18650 battery 3.7v 2200mahlife and fast charging requirements, followed by liquid cooling.

　　Air cooling is suitable for use under small power and good working conditions. Among the current domestic electric vehicle 18650 battery 3.7v 2200mahthermal management solutions, the 18650 battery 3.7v 2200mahpacks of BAIC, Zotye, Geely and other models are still in the state of air cooling technology.

　　The thermal management system of new energy vehicles includes: 18650 battery 3.7v 2200mahthermal management system, automobile air conditioning system, motor electronic control cooling system, and reducer cooling system. Above we have talked about the different applications of 18650 battery 3.7v 2200mahthermal management systems. Here is another question most relevant to winter: Do we need to turn on the air conditioner for heating in winter?

　　In the north, the cruising range of many cars is greatly reduced in winter. In order to ensure the cruising range, they have to turn off the air conditioning and heating. The driving experience can be said to be extremely poor! Here’s a comparison of several brands of heat pump thermal management systems and how they keep car owners comfortable in the winter.

　　The heating function of the air-conditioning system of electric vehicles mainly uses electric heaters. However, directly using electric heating to obtain heat will greatly reduce the 18650 battery 3.7v 2200mahpower and driving range. Statistics show that when the air conditioning heating function based on electric heating is turned on when driving in winter, almost half of the electricity is used for heating, and only half of the electricity is used for driving.

　　In a heat pump thermal management system, heat is moved from a low-temperature place to a high-temperature place. In summer, the heat pump system moves the heat inside the car to the outside of the car to achieve a cooling effect. In winter, the heat pump system transfers heat from outside the car to the inside of the car.

　　The specific process is as follows:

　　1. Heat is absorbed from the environment into the heat pump system;

　　2. Heat is compressed and heated;

　　3. Heat is used to heat the cold air in the cabin and warm it up;

　　4. The heated air is sent into the cabin;

　　5. The heat after decompression is converted into low-temperature heat and discharged outside the vehicle.

　　Compared with traditional semiconductor heating technology, the energy consumption of heat pump air conditioners will be reduced by approximately 50%. In this way, when the heater is turned on in winter, the cruising range can be increased by about 10-15%. For vehicles that currently generally have a cruising range of 300-500 kilometers, this air conditioner can really extend their life at a critical moment.

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