With the strong support of the state, the new energy industry is developing rapidly, and the related product and device market is also growing rapidly, and the future market space is huge. As the core device of new energy battery, BMS is no exception.
At present, most of the market share of BMS-related devices is in the hands of several major foreign manufacturers, such as NXP, ADI, TI, etc., and domestic enterprises account for a relatively low proportion. Therefore, for domestic enterprises, this is a market that can achieve breakthroughs. . At present, many domestic enterprises have already aimed at this product direction.
Cut into BMS from high precision analog signal chain
Judging from the previous review of the performance, accuracy and application scenarios of BMS fuel gauge chips at home and abroad by electronic enthusiasts, the current domestic manufacturers’ BMS fuel gauge chips still have some gaps with foreign chips in the industrial and automotive fields, reliability and other aspects. In the field of consumer BMS fuel gauges, the overall performance of domestic chips is no longer inferior to foreign products, and some fuel gauge chips with excellent performance are even better than foreign competitors in some hard-core indicators, such as ADC accuracy.
High-precision ADC is the key for BMS to collect analog data. Especially in the current mobile phone battery detection, the precision requirements are very high, which puts forward a lot of performances such as resolution, reference, temperature drift, sampling rate, and low power consumption of ADC. challenge. If domestic manufacturers want to enter the BMS fuel gauge chip market from detection accuracy, they must have profound attainments in high-precision ADCs.
Among the domestic players in the BMS fuel gauge chip track, Chipsea has launched a BMS fuel gauge chip based on the Sigma-Delta architecture ADC with its years of technical accumulation in the ADC field and combined with the BMS market demand. Sampling, noise shaping, dynamic temperature compensation, and digital filtering techniques enable high precision and low power consumption that other types of ADCs cannot achieve.
The core capabilities of BMS fuel gauge chips are indispensable
The mobile phone BMS fuel gauge mainly includes real-time dynamic detection of battery parameters, and functions such as battery SOC and SOH evaluation. For the fuel gauge system, the three core capabilities of hardware, algorithm and firmware are indispensable.
High-precision ADC technology requires continuous accumulation and precipitation, which is the embodiment of comprehensive performance. Chipsea Technology has been working on ADC since 2003, and has deep accumulation in ADC and its supporting aspects. On the BMS fuel gauge chip of the mobile phone, the high-precision analog data collection of the battery is realized through the ADC, and the performance indicators such as measurement high precision and low temperature drift are continuously improved.
Supporting current sampling resistors with smaller resistance is also an unremitting goal in the design of BMS fuel gauges. Smaller sampling resistors mean that higher voltage sampling accuracy is required to support larger charging currents. With the development of fast charging of mobile phones, the battery power is getting bigger and bigger, from about 20W to 60W or even more than 100W. high.
Judging from the sampling resistance of BMS fuel gauge chips currently used by domestic manufacturers on mobile phones, the commonly used sampling resistance is 10mΩ. Chipsea relies on high-precision ADC design, which can match the design of the sampling resistance below 1mΩ on the basis of low power consumption and high sampling rate. According to its press release, the existing specifications of Chipsea BMS fuel gauge chip parameters, it can already meet the application of mobile phone charging power greater than 120W.
The SOC accuracy is not only related to the hardware acquisition accuracy of the chip itself, but also closely related to the algorithm model and battery material system, and the accuracy requirements of different terminal applications are also different. Chipsea’s BMS is used in different terminal applications. The accuracy can be guaranteed to be in the range of 3~5% under the condition of fully meeting the requirements of customer application scenarios. Building high-performance MCUs into BMS products to support more complex chip customization algorithms will further improve system accuracy.
Domestic substitution of consumer terminals is not the end
The core of BMS lies in measurement and low power consumption, which requires low power consumption and high precision reference source support. At present, the domestic manufacturers that are making rapid progress in BMS products all master the core technology. For example, the BMS fuel gauge chip of Chipsea Technology mentioned above, its current and voltage ADC benchmarks are better than those of friends. The hard power improvement of BMS product performance indicators has accelerated the process of enterprises mastering core technologies to seize the market share of domestic alternatives.
This substitution will not only happen in the consumer BMS market. Completing batch application and substitution in the consumer BMS market is only the first step for many domestic manufacturers to lay out the BMS track. With persistent R&D investment and application practice in the field, domestic BMS products for consumer, small power and even automotive power will continue to be launched in series.
After the related products of the mainstream BMS chip suppliers of foreign manufacturers fell into a state of shortage and price increase, the market gap was not small, and the market demand for BMS chips continued to grow. The strong market demand is both an opportunity and a challenge for domestic BMS chips. It is foreseeable that the domestic substitution that is taking place in consumer terminals will not be the end of domestic BMS.