Take off the coat of the battery to understand the

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Tear off the "coat" of the battery to understand the power battery packaging

as we all know, as the core component of the pure electric vehicle, the performance of the power battery in all aspects is closely related to the performance of the whole vehicle. Today, we will talk about the "coat" of the battery, which is also a crucial link in the production of the power battery - packaging. Good battery packaging directly determines the safety and service life of the battery. Therefore, selecting an optimal battery shell material and selecting the optimal packaging process according to the characteristics of the shell material has become a very focused topic for every Parker company that hopes to help plastic packaging manufacturers achieve zero landfill power battery manufacturers through new technologies

first of all, we need to find out what requirements the power battery packaging needs to meet. In combination with the use scenarios of automotive products, it is necessary to withstand mechanical impacts such as falling, impact resistance, vibration resistance, extrusion and puncture. In addition, it is also necessary to meet the requirements of chemical immersion, high and low temperature resistance, fire prevention and flame retardancy, thermal management, and lightweight design and wiring layout. Therefore, it is not difficult to see that the packaging process threshold for power batteries is not low

as far as the current situation is concerned, there are three most mainstream battery packaging methods, cylindrical, square shell and soft package, which are good or bad. Although the soft pack battery has many advantages such as flexible size change, high energy density, light weight and small internal resistance, it also has some disadvantages such as poor mechanical strength, difficult sealing process, complex group structure and difficult design, and even shows average cost, consistency and safety

although both cylinder and square belong to hard shell packaging, they also have their own corresponding characteristics. For example, cylindrical packaging has small size, flexible grouping, low cost and mature process. At present, the packaging method adopted by Tesla's pure electric vehicles is the hard shell cylindrical battery. However, as a first-line brand in the international ⑴ Experiment 1, it still has to face the problems of difficult heat dissipation design, poor consistency, heavy weight, low energy density and so on

as the name suggests, the packaging of square shell battery is to make the single battery into a square and use high-strength aluminum alloy as the packaging material, which has the advantages of light weight and strong hardness. In addition, this kind of packaging is conducive to making the internal materials of the battery more tightly wrapped. Under the limitation of the high hardness of the hard shell, the battery is not easy to expand, so it is relatively safer. For example, BYD automobile, which shares the development trend of polyurethane pipe insulation technology in the future with Bayer materials technology in China, is second to none in the field of new energy. As a car enterprise with the ability to synchronously manufacture batteries and complete vehicles, BYD has always used its product technical strength to shape the wind direction of the new energy industry. In terms of power battery packaging, BYD has adopted the hard shell square power battery packaging process, For example, the latest pure tram Qin Pro ev500 of Dynasty Series is equipped with an aluminum alloy square battery with an energy density of 160.9wh/kg. In addition, BYD's square shell packaging method is also equipped with an explosion-proof plug inside. In case of thermal runaway, the expansion air will be released from the fixed direction of the explosion-proof plug, which is not easy to affect other cells, greatly increasing the reliability and safety of the car

on the other hand, BYD adopts the square packaging process, which reduces the gap between cells compared with the cylindrical packaging, making the overall size more compact. In addition, the shell adopts aluminum magnesium alloy with smaller density, lighter weight and higher strength, making the energy density and safety of the battery higher. The performance in terms of endurance will also be more outstanding

in general, with the explosion of pure electric vehicles, the battle of technical lines in the battery field will not come to an end. The industry generally believes that in the next five years, there will still be three kinds of batteries coexisting. It is believed that the batteries with three packaging processes, such as soft packaging, square packaging and cylindrical packaging, will also make breakthroughs on the road of continuous improvement by virtue of their respective advantages. As the final vehicle model product or car enterprise brand, the main engine plant such as BYD, which already has the advantage of the whole industry chain, is bound to achieve technological breakthrough faster along the existing square shell packaging technology route, and achieve the progress of battery packaging technology with low cost and high quality

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