Technical solutions for thickness measurement of soft-packed lithium batteries

Soft lithium battery thickness measurement technology method: It is recommended to use Dacheng precision 2D offline laser thickness gauge. Now lithium batteries are important in three categories: square, cylindrical, and soft pack. Among them, square and cylindrical shells are mainly used for aluminum alloy, stainless steel and other hard shells. The soft-packed aluminum plastic film used in the outer shell is their essential difference. As shown in Table 1, the important advantages of soft-packed lithium batteries include: (1) Good safety performance: The soft-film battery has less electrolyte leakage. In the case of potential safety hazards, the soft-film battery will burst instead of the internal pressure of the hard-shell battery; (2) Lightweight: the weight of the soft-pack battery is 40% lighter than the square battery of the same capacity and 20% lighter than the square battery with the same capacity. %; (3) Large battery capacity: The flexible packaging can save 20% of the volume, which is 50% higher than the steel shell battery of the same size, and 20-30% higher than the aluminum shell battery. (4) Good cycle function: the cycle life of the soft pack battery is longer, the attenuation of 100 cycles is 4%~7% less than the attenuation of the aluminum shell; (5) the internal resistance is small, and the internal resistance of the soft pack battery is small. The battery, the domestic minimum 35m, greatly reduces the power consumption of the battery; (6) Sensitive design: can be customized according to customer needs, can be made thin, ordinary aluminum shell can only be 4mm, and flexible packaging can only be 0.5mm. Comparison of three battery functions: In terms of function, the soft pack battery has more comprehensive advantages, and the future use prospects are broad: 1) The soft pack battery is more suitable for portable, space-intensive or thickness-based applications, such as 3C consumer electronics; 2) Although the prismatic battery has a high single capacity, it is large in size and heavy in weight, while the soft pack battery has obvious advantages in energy density. In addition, the current single cell is also developing in the direction of large capacity and high magnification, which will be more in line with the needs of new energy vehicles and other types of mobile power supplies. 3) Although the processing technology of cylindrical batteries is complicated and the energy density has significant advantages, because the capacity of the single battery is small, the same battery pack capacity range requires more batteries, such as the Tesla model S battery pack capacity is 85 kWh. There are about more than 70018650 cylindrical batteries, battery management system (BMS requirements are very high, and the single battery capacity soft pack value is more than 10 18650 type cylindrical batteries, the requirements for BMS are low, considering most of our country and even the world The carrying capacity of BMS is limited, and large-capacity battery packs will not use too many cylindrical batteries. In addition, cylindrical batteries have high energy density, poor safety, and high internal pressure due to hard shells, so explosions often occur, while soft-pack batteries It has obvious advantages. China’s mainstream electric vehicle companies are now accelerating the use of soft-pack batteries. Passenger car companies such as BAIC and SAIC have begun to try to use soft-pack batteries. Wanxiang A123 and voneng technologies occupy the mainstream of soft-pack batteries. At the same time, domestic The 3D soft pack technology has made significant progress, and the energy density has been greatly improved. Under the soft pack trend, power lithium-ion battery companies must seize the opportunity to increase their soft pack processing. Facing the huge market temptation, domestic companies are also deploying complex lithium battery soft packs. Package business. From January to May 2018, the installed capacity of power lithium-ion batteries nationwide was 1.266 billion kWh, an increase of 247.80% year-on-year. During the period, the installed capacity of soft-package power lithium-ion batteries reached 1.43Gwh, an increase of 71.98% year-on-year. The market share reached 11%, a year-on-year decrease of 12 percentage points from January to May. The important reason is that in the first five months of this year, CATL and BYD’s loading volume has increased rapidly, and the market share of prismatic batteries has increased, while soft packs and cylindrical batteries have increased their market share. Shaped batteries have declined. It is predicted that with the increase in the saturation rate of soft packs, the demand for lithium batteries will increase. By 2020, the saturation rate of soft packs will reach about 41%, and the demand for soft pack batteries will reach 59GWh And GAGR35%. 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