Year1
. The editor of Chengdu Panfeng Technology asked what is a battery pack? What is the difference with batteries? What is the difference between a car battery and a mobile phone battery? A detailed explanation of these questions: If we compare electric vehicles to a team, the operation and progress of this team requires talents with different backgrounds and abilities. The battery pack is an indispensable person in this team, and the battery is just the An organ of a person, that is, his heart. The ultimate purpose of the battery pack is to provide various protection and assistance for the battery, so that the battery has a longer life and can cope with various extreme weather and environmental conditions. < . Shell and base (r)
The biggest difference between car batteries and mobile phone batteries is that the environment experienced by cars is very different from that of mobile phones. A car will experience various vibrations during operation, as well as the intrusion of water, mud, and sand from the external environment. Therefore, the casing and base of the battery pack are crucial. The base of electric vehicle battery packs in the world is generally made of aluminum alloy or stainless steel, while the upper shell that is combined with the car chassis may be made of composite materials with glass fiber added. During the test, the battery pack will undergo three-dimensional vibrations, as well as wind and rain equivalent to more than a year (dust and water spray from different directions), to ensure that there is no intrusion of any foreign matter inside the battery pack. Make it watertight. It is worth noting that the battery pack is connected with other components of the car by wires, and the connection between these wires and the battery pack must be watertight. .
. . < .Temperature Management System ( )
Users will also expect their electric vehicles to perform well in various weather conditions 3 days a year. The car battery pack directly affects the acceleration and driving range of the car, which is very different from how people observe the performance of mobile phone batteries. The temperature management system ensures that the temperature of each single cell is constant throughout the year. Extensive use of batteries in extremely hot weather can ensure timely heat dissipation and prevent the battery from weakening its life or expanding and exploding. Use the battery extensively in extremely cold weather to ensure that the inside of the battery is warm enough without affecting performance and life. The heat dissipation of the battery is to use liquid coolant to flow through the bottom of the battery pack, and then the cooling plate with excellent thermal conductivity is in direct contact with the single cell. Or use direct air cooling, that is, use a built-in electric fan. The heating and keeping of the battery is done by the heater, and the power of the heater comes from the battery itself. Therefore, the driving range of electric vehicles will be slightly reduced in winter. Another challenge comes from charging in extreme environments. Since the car is turned off when charging, the temperature management system needs to start automatically when it is informed of charging to maintain the internal temperature of the battery pack. This means that when the entire car is in sleep state, the battery pack is still is awake.
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. < .3. Balance of single cells (B)
. . There are many single cells in the battery pack, some in series and some in parallel. The driving range of an electric vehicle is directly determined by the worst-performing single battery, so maintaining the voltage and remaining power in each single battery is also crucial.
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