In life and work, people are becoming more and more efficiency conscious! Reflecting on lithium batteries, a significant increase in charging efficiency is one of the mainstream directions to alleviate range and mileage anxiety! Despite this, there are technical challenges in several aspects of Li-ion battery charging efficiency! How does LYBATT solve these technical difficulties?
The formula "charging power = charging voltage * charging current" shows that increasing either the charging voltage or the charging current can increase the charging efficiency. Therefore two directions have emerged in the development of fast charging technology: increasing the charging voltage or increasing the charging current. Based on these two technical directions, today we will take LYBATT's fast charging technology solution as an example and introduce it to you.
Technical route to increase charging current
Technical difficulty: The charge rate performance of the cells is the cornerstone of fast charging of Li-ion batteries. When charging and discharging at high rates, high currents can damage the internal structure of the battery and reduce cycle life. Therefore, it is important to choose a high-magnification battery with stable quality and long cycle life.
Solution: To produce high rate cells with stable quality and long cycle life, you need to have enough precipitation in technology and a lot of capital and manpower investment, only the leading enterprises in the industry have such strength. lybatt has been cultivating the lithium battery industry chain for many years, and has reached strategic partnership with many leading enterprises in the core industry such as CBAK, Lishen, LG, Samsung, EVE, etc. We can provide different high rate cells, more guarantee in product quality!
Technical difficulty: The cell of a lithium battery is welded in series and parallel through nickel strip, aluminium row, copper row, etc. We know that the over-current capacity of the same metal material is determined by the cross-sectional area of the material. As the area of the pole lug of a lithium battery is relatively fixed, the over-current capacity of a metal connector is fixed, which also determines the upper limit of the charging power of a lithium battery.
Solution: LYBATT starts with composite materials and works with upstream suppliers to design and develop a wide range of composite (copper-nickel composite connection piece, copper-aluminium composite connection piece) materials with twice the over-current capacity of a single metal connection piece, which have been widely used in many of LYBATT's high rate battery products.
Technical difficulty: Most lithium batteries are currently charged blindly, so the charging efficiency is mainly affected in two aspects: a, whether the charging power of the charging facility reaches the upper charging power of the lithium battery; b, the cooperation between the charging facility and the lithium battery, because the upper charging power of the lithium battery fluctuates at different SOC stages, and if the charging facility cannot be adjusted accordingly, it will also affect the charging efficiency
Solution: LYBATT communicates between the Li-ion battery and the charging device through a handshake protocol, with the battery BMS sending commands to the charging device to obtain the upper charge current acceptable to the current SOC and temperature environment. Not only does this improve charging efficiency, but it also reduces the impact of high current charging on the cycle life of the Li-ion battery! However, this has requirements on the hardware architecture of the lithium battery and the charging device.
Technical difficulty: when the lithium battery is charging at high current, the cell and the internal metal circuit will generate heat, when the heat builds up the ambient temperature will rise rapidly, if it exceeds the upper limit of the working temperature of the lithium battery, the BMS is to cut off the circuit, making the battery stop working until the battery temperature returns to the normal threshold, playing a role in protecting the lithium battery.
Solution: The temperature rise and fall management of lithium batteries can also play an important role in improving the charging efficiency of lithium batteries. The management measures of warming and cooling measures (skip to: temperature management solutions), so that lithium batteries are always kept in the optimal operating temperature range, is one of the ways to improve charging efficiency!
High pressure platform routes
Technical difficulties: In a high-voltage environment, there are higher requirements for all electrical components and insulation materials in terms of their voltage resistance values. In addition, some of the battery supporting equipment or other components of the vehicle that require power supply are low voltage and are not directly accessible to the battery pack.
Solution: LYBATT integrates the resources of the industry's automotive-grade high-voltage component suppliers to deliver voltage withstand values in excess of 1500V. In addition, a high-power DCDC converter is integrated within the battery for direct power supply to low-voltage vehicles or equipment platforms.
LYBATT has provided fast-charging power lithium battery products to many customers, with 0-80% SOC in 1h, and the super high charging efficiency is well recognized by customers and users.
