What are the advantages and disadvantages of soft bag/square/cylindrical battery?
The first thing we want to say is the most popular cylindrical battery. As early as 1992, Sony, Japan, developed 18650 batteries. The current cylindrical battery can be divided into 14650, 18650, 21700 and other models. This is a battery name named after the battery size. I believe that everyone has heard of the two batteries of 18650 and 21700 that 18650 is the most common battery model on the market and the most mature technology, while 21700 is a new type of battery pushed by Tesla in recent years. The size of a single -section cylindrical battery has become larger and more electricity. In this way, the number of batteries has been greatly reduced, making the vehicle more handy in the control of the battery system.
Let's talk about the advantages of
cylindrical battery. First of all, after years of development, the standardization of cylindrical batteries is high, and it is easy to achieve unified standards in the industry. In addition, cylindrical batteries also have innate advantages in heat dissipation. When the cylinders and cylinders are formed during the packets, a good heat dissipation space is formed. Therefore, some vehicles equipped with cylindrical batteries use lower cost air -cooling technology.
Of course, cylindrical batteries also have disadvantages. For vehicles using cylindrical batteries, it is not possible to prevent the battery control problems brought by a large number of battery monomers. After all, even the 21700 battery is used Very huge. In addition, because the cylindrical battery needs to be used in combination into a battery pack, the steel shell is required, so its weight is relatively high, and the energy density is insufficient compared to the other two shapes of the battery.
In the shape of the battery, most of the battery packs of cylindrical batteries can only use rectangular layout and install it below the vehicle. The method is relatively single, because this can ensure that the battery pack will not affect the front and rear weights of the vehicle. The height of the ground clearance and the floor in the carriage will affect. And some hybrid models that choose to place the battery pack under the trunk, although balanced in weight distribution, also sacrificed the trunk space.
Let's talk about square batteries. The plasticity of square batteries will be stronger, and customized design can be made according to the specific needs of the product. This has also led to different sizes. At present, no matter the manufacturing process or application standards, there is no clear standard division of the cylindrical battery. However, because of its high flexibility, it has been used in early new energy vehicles for a long time, and car companies can customize the size of the opponent's battery size according to the needs of the model. Square batteries have also been considered the best battery design for new energy vehicles. In fact, many square battery packs on the market, although the name is square batteries, the internal essence is still to be said.
Because the soft bag battery uses a superposition manufacturing method, it is thinner and has the highest energy density, which is more in line with the development trend of my country's new energy vehicle market. In addition, soft bag batteries can also be customized according to different needs. Because the controllability of its volume is also valued by the car brand, especially for hybrid models, when considering the layout and weight of the vehicle at the same time, the advantages of soft -packed batteries are even more obvious. The soft bag battery pack also uses aluminum -plastic film packaging lighter than the aluminum shell, which further improves the energy density of the entire battery pack.
In terms of the shape of the battery pack, the soft bag battery also has a lot of advantages. The also customized soft bag battery has more imagination in shape, and more changes are not limited to rectangular. It can form a small battery pack and place it under the trunk, or it can be made into a T -shaped layout.
Although there are many advantages of soft bag batteries, there are obvious defects, that is, poor consistency, that is, the comprehensive performance of the battery pack. Because the thermal consumption of batteries at different temperatures is different, this is because the chemical reactions inside the battery are closely related to temperature. If the battery runs in inadequate internal environments such as thermal insulation or high temperature, the battery temperature will rise significantly, causing hotspots inside the battery pack to form a hotspot, and eventually out of control may occur. This also means that the soft bag battery needs to be more complex battery control system.
Summary: In the current new energy vehicle market, three types of batteries: cylindrical, square, and soft bag are used by manufacturers, each with one place, and the three are not absolutely good at this stage. Beauty and disadvantages. Due to the long development time, the cylindrical battery has a lot of advantages in consistency. At the same time, its manufacturing process is more mature and the cost is low. However, in terms of battery layout and energy density, cylindrical batteries still have further room for improvement. Regarding square batteries and soft bag batteries, although it is difficult to comparable to cylindrical batteries at the standardization level, it can achieve customized characteristics to better coordinate with the vehicle, and meet different manufacturers different from different manufacturers. Special needs of the model. It can be said that the shapes of the three battery have their own advantages.
Guangzhou Battsys Co., Ltd (NEEQ:837375), was founded in 2006, which is a join-stock high-tech enterprise engaging in ODM and OEM , specially for customized and diverse research&production of lithium-ion battery，BATTSYS annual production capacity is tens of millions battery cells. The products are exported to dozens of countries & regions such as Europe, America & Asia etc.
