Whenever I tell people that I am designing a battery pack for an electric car, people always ask me what is the battery pack? What is the difference between the battery and the battery? What is the difference between a car battery and a mobile phone battery?
This article refers to the address: http://
If we compare an electric car to a team, the team needs to run and advance with different backgrounds and talents. The battery pack is an indispensable part of the team, and the battery is just an organ of this person. It is his heart.
The ultimate goal of the battery pack is to provide various protections and assistance to the battery, so that the battery can last longer and can cope with extreme weather and environmental conditions.
Shell and Tray
The biggest difference between a car battery and a cell phone battery is that the environment experienced by the car is very different from that of the phone. The car will experience various vibrations during operation, as well as the intrusion of water, dirt, and sand from the outside environment. Therefore, the outer casing and base of the battery pack are essential.
The base of an electric vehicle battery pack existing in the world is generally made of aluminum alloy or stainless steel, and the outer casing combined with the automobile chassis may be made of a composite material added with glass fiber.
The battery pack will undergo three-dimensional vibration during the test, and it is equivalent to more than 10 years of wind and rain (spray from different directions of dust and water), to ensure that there is no foreign matter in the battery pack, so that the drip does not leak.
It is worth noting that the battery pack has a wire connection with other components of the car, and the connection between these wires and the battery pack is also required to drip.
Temperature Management System (Thermal Management System)
Users will also expect their electric cars to perform well in all weather conditions 365 days a year. The car battery pack directly affects the acceleration and cruising range of the car, which is quite different from the performance of the mobile phone battery.
The temperature management system ensures that the temperature of each cell is constant throughout the year. The use of batteries in extreme heat conditions ensures timely heat dissipation and prevents battery life from diminishing or exploding. Use the battery in extreme cold weather to ensure that the interior of the battery is warm enough that it does not affect performance and life.
The heat dissipation of the battery is carried out by the liquid coolant flowing through the bottom of the battery pack, and then directly contacted with the single battery by the excellent thermal conductivity cooling plate. Or direct air cooling, that is, using a built-in electric fan.
The heating and warming of the battery is done by the heater, and the power of the heater comes from the battery itself. Therefore, the cruising distance of electric vehicles in winter will be slightly reduced.
Another challenge comes from charging in extreme environments. Since the car is turned off while charging, the temperature management system needs to be automatically activated when the charging is known, and the internal temperature of the battery pack is maintained, that is, when the entire car is in a sleep state, the battery pack is still It is awake.
Cell Balance (Cell Balancing)
There are many single cells in the battery pack, which are connected in series or in parallel. The cruising range of an electric car is directly dependent on the one that performs the worst, so keeping the voltage and remaining power in each cell is also critical.
The battery pack has a device called VITM (voltage current temperature module) that measures the voltage, current and temperature of each cell in real time, guarantees and regulates the use of a single cell through a series of resistors and transistors, while giving temperature management. The system communicates commands to regulate coolant flow and temperature to cool and warm the battery.
Power Electronics
Strictly speaking, power electronics are not part of the battery pack, but some battery pack manufacturers also classify them as battery packs.
The power electronics include a charging module, an inverter used in regenerative braking, and an APM (accessory power module) for assisting the interior energy of the cabin.
The charger means that the AC power in the power grid is converted into DC power that can be directly used by the battery. However, with the innovation of technology, more DC charging stations have gradually appeared in the world, and the direct conversion of alternating current to direct current is completed in the charging station, which reduces the necessity of this component inside the battery pack.
However, in regenerative braking, the AC power from the generator still needs to be converted into DC power that can be used by the battery. During the car's travel, the DC power from the battery must also be converted into AC power that can be used by the power supply. An inverter will be used.
APM reduces the power of large battery packs to a typical 12V battery for use in automotive interior lighting, radio and CD players, instrument panels, and air conditioners. Since it is a conversion between the battery and the battery, a converter is needed instead of an inverter.
The transformation of direct current is not as easy as the transformation of alternating current. The alternating current transformer requires only one transformer. The voltage conversion of direct current requires an inverter to convert high-voltage direct current into high-voltage alternating current. One transformer reduces high-voltage alternating current to low-voltage alternating current. , and an inverter converts low-voltage alternating current into high-voltage direct current.
This process is cumbersome, so the industry also uses a buck converter or boost converter, which is constructed as a transistor or diode, inductor, and capacitor.
to sum up
The future of electric vehicles depends on the innovation of car batteries. A new generation of batteries requires longer life, higher energy density, increased EV range and long-lasting performance. A single battery cannot be separated from a battery pack, just as the heart cannot be separated from the body, and every organ inside plays a supporting and supporting role.
We spent a long time throwing away lead-acid batteries and started using nickel batteries, and it took a long time to start popularizing lithium batteries. Lithium batteries have a wide variety of chemistries and are widely used.
Before we wait for the next new electrochemical technology, the innovation and continuous improvement of the battery pack will determine the trend of electric vehicles in the short term, making the electric vehicle durable and durable under the challenges of different environments.
electronic accessories for Silicone
Electronic Accessories For Silicone,Silicone Keyboard,Silicone Keyboard Covers,Silicone Keyboard Protector
Nantong Boxin Electronic Technology Co., Ltd. , https://www.ntbosen.com