This year's "winter is coming" in the auto industry, is it colder than in previous years? With the release of financial reports of some component manufacturers, it is expected that the terminal demand will not increase but decrease, and the data of the first decline in many years affects the nerves of upstream manufacturers. However, according to data released by the China Association of Automobile Manufacturers, the production and sales of new energy vehicles surged forward at a growth rate of nearly 70% from January to September, showing that the growth momentum of new energy vehicles is still exceptionally strong when the overall auto market experiences negative growth. Another irritating news is that Tesla released its Q3 financial report ahead of schedule, saying that as the most valuable car company and electric vehicle manufacturer in North America, it has achieved real quarterly profit for the first time in its 15-year history, relying on new energy vehicle sales. It is not what the industry thinks of "selling new energy points for profit".
Figure 1: From January to September 2018, China's new energy vehicle production and sales increased by over 70% year-on-year
Many years ago, new energy vehicles were still a new thing with bright prospects, but the technical difficulties were also very high. The giants of traditional car manufacturers have said that the rapid development of new energy vehicles will make most manufacturers unable to make profits and damage the interests of the industry. Slow down the development of electric vehicles. However, new terminal car manufacturers such as Tesla, TIer1 such as CATL and BYD, and semiconductor manufacturers with insights into the development of new technologies have entered the market. Concerned about sex, low investment in charging facilities, etc., consumers are more and more accepted, and the market performance is very bright.
So far, both in terms of policy and the market, traditional auto giants have to accelerate their investment in technologies, products, supply chains and service systems in the field of new energy vehicles. News such as the annual launch of an electric car at half the price of Tesla is constantly heard, which is also a market-oriented manifestation of this trend. The participation of these giants with deep accumulation of funds, talents, channels and other resources will greatly promote the rapid development of the new energy vehicle market.
Figure 2: BEV cost structure, source: Internet, comprehensively compiled by Gasgoo Automotive Research Institute
The future of the automotive industry lies in new energy vehicles. The core of new energy vehicles lies in the battery, motor, and electronic control. Data from Gasgoo Automotive Research Institute shows that automotive electronics in pure electric vehicles (BEVs) account for more than 60% of the total vehicle cost. Among them, the battery accounts for 42% of the cost of the whole vehicle, and its performance directly affects the battery life and safety. Industry insiders pointed out that the sales of Tesla Model 3 surged because compared with the previous Model S, the new battery cells it replaced had a 35% increase in capacity, a 20% increase in energy density after grouping, and a cost reduction of about 9%. %. In theory, for every 10% increase in battery capacity, the cycle life will decrease by about 20%, the charge and discharge rate will decrease by 30-40%, and the battery will heat up by about 20%—a 20% increase in temperature and a 20% decrease in cycle life. % is the fatal flaw of electric vehicles. But from the current market feedback, Tesla Model 3's battery management system has done a good job, offsetting these negative effects.
It does. The core of the new energy vehicle battery lies in the BMS (battery management system) - radical people even think that "a battery pack without BMS is a bomb". BMS is based on battery monitoring IC and isolation technology, through thermal management of the battery, start and stop the battery cooling system, monitor the state of health (SOH) of each battery; by controlling the charge, discharge and capacity balance of the single battery in the system, control The state of charge (SOC) of each battery prevents the overcharge and overdischarge of the single battery from causing danger; and constantly confirms that it is in a normal operating state to ensure real-time monitoring of the overall battery health to meet automotive functional safety requirements. BMS can improve battery pack efficiency, prolong life and ensure safety, and has become an important design consideration for new energy vehicles to increase cruising range and reduce vehicle costs.
Take ADI's latest-generation lithium-ion battery BMS solution, a high-performance analog chip manufacturer, based on ADI's latest fourth-generation lithium-ion battery monitoring IC product LTC6811, digital isolator iCoupler optimized for automotive applications, and unique integrated power digital The isolator solution isoPowerâ„¢, with high-precision monitoring function, meets the requirements of the ISO26262 functional safety standard, can maintain good performance in harsh environments, provide reliable and safe power management, and can effectively reduce the overall cost of the system, helping the battery Suppliers and terminal automakers achieved better performance in the new energy vehicle market.
According to ADI's official information, ADI's lithium battery monitoring IC products have developed to the fourth generation, and their safety, accuracy and functions have been continuously improved, and they are always the best choice in the industry. LTC6811 is ADI's latest high-performance battery monitoring IC product, which can monitor voltage and temperature of 12 channels respectively (more flexible channel numbers will be provided in future products), and the limit accuracy is better than 1.2mV; daisy-chain connection can be used; The fastest conversion speed and best data protection; 12 channels of data can be detected within 290μs; and passive battery cell balance control function. Compared to its predecessor, the LTC6804, the LTC6811 is lower cost, offers additional filter cutoff frequencies, additional passive and active balance control functions, new ADC commands, and additional fault tolerance for functional safety.
Figure 3: ADI Recommended BMS Solution Block Diagram: Daisy Chain Architecture
ADI's iCouplerâ„¢, a digital isolator optimized for automotive applications, offers the lowest power consumption performance at high speeds while offering the advantages of small package size, multiple channel options, and minimal component count and board area. isoPowerâ„¢ is ADI's unique integrated power digital isolator solution that provides isolated power and multi-channel digital isolation; isoPower is a lower cost, lower footprint solution than a discrete DC-to-DC isolator plus digital isolator solution The area is smaller.
Figure 4: ADI's high-performance monitoring IC+ isolation solution, a safe and reliable patron saint.
Based on long-term accumulated extensive experience in the automotive electronics market, ADI provides complete solutions for higher efficiency, higher reliability and safety for automotive energy management, allowing systems such as battery management and powertrain to maintain high performance while becoming smaller , lighter and more reliable, helping more environmentally friendly and efficient future cars to land in China as soon as possible.
Figure 5: ADI's complete solution for automotive energy management.
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