How To Protect Your Lithium Batteries?

Lithium battery (rechargeable) is required for protection, it is determined by its own characteristics. Because the lithium battery material itself determines that it cannot be overcharge, over discharge, short circuit and ultra high temperature, lithium battery charge and discharge, so the components always followed by a fine protection board and a current for the presence of insurance.

The protection function of lithium battery protection circuit board usually consists of PTC and current of the device work cooperatively, the protection board is composed of an electronic circuit, at -40 DEG to +85 DEG C under the environment of current monitoring time accurate electric core voltage and charge discharge circuit, to control the current loop off; prevent bad battery PTC the damage in high temperature environment.

Common lithium battery protection board usually includes control MOS, IC switches, resistors, capacitors and auxiliary devices FUSE, PTC, NTC, ID, memory, etc. The IC control, MOS control switch in all normal circumstances, the electric core and the outer circuit, and when the voltage or current loop exceeds the specified value, it immediately to control the MOS switch off protection, electric core security.

In order to better serve to our customers, we also provide you some high-quality protection board, and be evaluated as the most professional PCM supplier of electric tool batteries in 2014. 

Currently we always provide 1-26S PCM, the most current can reach 150A, and 80A is our popular type. 

Here attached some photos for reference:

2S PCM

3-4S PCM

5-9S PCM

10-16S PCM

24S PCM

Please tell me your request, we can customized for you according to your needs.

Contact Info: Caroline Yong

Email: Caroline.Yong@ufo-battery.com

Skype: ufobattery.caroline

Morocco gives priority to developing renewable energy and sustainable resources

As part of its energy utilization strategy, Morocco gives priority to the development of renewable energy and sustainable resources. Morocco has a wealth of solar energy resources, annual power generation 2,600 kilowatts / square meter, and in the core strategic position of the energy center. The power can be stored in solar power batteries, like 48v 100ah lifepo4 battery pack, with BMS to control whole system.

Morocco provides more investment opportunities in the solar thermal and solar energy industry. Including the Morocco solar project: the project plans to build five total power generation by 2000 solar power station. Solar technology and photovoltaic technology will be used for these five power plants. The project is expected in 2020, the proportion of solar power will account for 14% of the total electricity, reducing 3.7 million tons of carbon dioxide emissions per year.

Morocco solar water heater market development project: This project is scheduled to be completed in 2020 installed 170,000 square meters of solar thermal sensors. Solar thermal energy, the average annual power generation is expected in 2020 reached 1190 gigawatts, is expected to reduce 9.2 million tons of carbon dioxide emissions each year.

Lithium Battery Pack BMS Product’s the Third Architecture

Currently lithium battery BMS products are mainly two kinds of architecture, centralized management system and distributed management system. Centralized have lower cost, but the wiring harness is more complex, and the need for a single cell to corresponding, if the wrong battery will be short-circuit the risk of fire.

Distributed wiring harness is relatively simple, but the monomer management unit (CSC) still need to maintain a one-to-one correspondence with the battery cell (by setting a soft address or hard address on the CSC to solve), it let the production and maintenance of an additional workload. Another point to note is that if the active balancing function is to be implemented, the BMSs of the two architectures will require additional wiring to complete the energy transfer. Moreover, another problem to be solved is the switch matrix, which is how the energy flows into the cell from the entire cell.

There are currently used in the program is through the relay, to achieve a simple, but also brought the issue of life and reliability. Because the relay is a mechanical electronic components, there are life-time restrictions and the risk of adhesion during switching. Another solution is the use of electronic switches, MOSFET, but will bring the cost and complexity of the circuit rise.

From the functional realization point of view, BMS all functions are not insurmountable technical threshold, but from the practical point of view, BMS product is difficult to complex wiring harness, one-to-one relationship and high current active low balance cost realization. Centralized management systems and distributed management systems are not a good solution to these problems.

There is a company has proposed a third architecture, modular architecture, clean and agile to solve the BMS problem.

The system consists of UM (single module), controller and bus (2-wire system) three parts. The battery pack is divided into one or more groups according to the number of cells. Each cell is equipped with a UM module, which is a standard module, without any hard and soft address setting. The module is 4 ports, 2 inputs 2 outputs, the input is connected with positive and negative pole of the battery cell, the output is connected with each bus line; The bus line is 2-wire system, can transmit data and energy, active equilibrium current can reach 10A; Controller connection, thus forming a system. Like building blocks, multiple systems can be connected via CAN bus to build a larger (100 series level) of the battery energy management system, building modular architecture hence the name. The modules and buses that make up the system are standard components, and only the controller is set up according to the size of the system.

At first glance, this architecture is similar to a distributed architecture in that its UM and distributed 

CSC functions are similar; however, their UM is simpler and more flexible than the CSC without any

 address setting, that is, any 2 UM can replace each other, production and maintenance efficiency will be much higher, the operator requirements are not so high. Bus only two lines, yet the data transmission and energy transfer unify, solve the wiring harness and matrix switch problems. This third BMS architecture has the potential to become the ultimate BMS product architecture.

Several functions of Battery BMS

(1) Accurate estimation of SOC:

Accurate estimation of the state of charge (SOC) of the power battery, that is the remaining battery power, to ensure that the SOC is maintained within a reasonable range to prevent over-charging or over-discharging damage to the battery and display the remaining power of energy storage battery. The state of charge of an energy storage battery.

(2) dynamic monitoring:

In the battery charge and discharge process, real-time collection of batteries in each battery terminal voltage and temperature, charge and discharge current and the total voltage of the battery pack, to prevent the battery overcharge or over discharge phenomenon. At the same time can give the battery condition in time, pick out the question battery , to maintain the reliability and efficiency of the entire battery operation, so that the realization of residual power estimation model possible. In addition, the use of historical records of each battery, but also for the further optimization and development of new electric, charger, motor and other information to provide a basis for offline analysis of system failure.

The battery charge and discharge process will usually use more accurate and more stable current sensor for real-time detection, the general current according to the BMS front-end current of different sizes, to select the appropriate sensor range for close to 400A, Open-loop principle, domestic and foreign manufacturers are able to bear low temperature, high temperature, strong earthquake JCE400-ASS current sensor, select the sensor need to meet the high precision, fast response time.

(3) the balance between the battery:

That is single battery balanced charge, so that the battery pack in all the batteries have reached a state of equilibrium. Equilibrium technology is currently the world is committed to research and development of a battery energy management system of key technologies.

Guangzhou new energy vehicle production increase two times from January to July

August 30, the Guangzhou Municipal Bureau of Statistics official website released data that the city's smooth economic operation from January to July, the main economic indicators have fluctuated, the overall stability. Among them, industry, consumption growth was flat in the first half year, investment growth slowed slightly. Guangzhou to implement the structural reform of the supply side has gradually markedly, new energy, a new generation of information technology, new materials, product output to maintain growth doubled, driven by corporate profits were recovering faster growth. The new energy can be used in solar powered portable generator.

High value-added new products to increase the rapid growth of corporate profits

January to July, Guangzhou to achieve above-scale industrial output value of 1.087773 trillion yuan, above-scale industrial added value of 269.214 billion yuan, up 6.8% year on year growth rate was flat with the first half.

The gross output value of the three pillar industries increased by 8.9%, and the growth rate was 0.4 percentage point higher than that of the first half year. Among them, the automobile manufacturing industry grew by 11.6%, the electronic products manufacturing industry increased by 11.8% and the petrochemical industry increased by 1.7%. The latter two grew faster than the first half year.

Among them, the three pillar industries of new products momentum is good. The new products of automobiles maintained a rapid growth. The output of new energy vehicles and sport utility vehicles (SUVs) reached 2,352 units and 568,100 units respectively, up by 2 times and 79.2% respectively. In the new information technology products, Devices, fiber optic cable production increased by 2.2 times and 33.4%; new materials, lithium-ion battery products were doubling the growth trend, the output growth of 1.2 times.

High value-added new products to increase, as stimulating industrial enterprises profit recovery was one of the reasons for the rapid growth. The first half of this year, industrial enterprises above designated size realized total profit of 53.922 billion yuan, an increase of 16.4%, but the growth rate from January to May fell 4.1 percentage points. According to previous public figures show that in the first half, new energy vehicles, optoelectronic devices, lithium-ion battery production respectively achieved year-on-year growth of 3.9 times, 2.6 times, 1.3 times, it include LiFePo4 battery pack.

Fixed asset investment growth rate of 12.7%

Investment in fixed assets, the total investment amounted to 492.227 billion yuan, the overall growth rate of 12.7%. Since the first half of this year, industrial investment has been rising since the decline, its growth rate continues to accelerate, an increase of 15.4%, the growth rate of 2.7 percentage points higher than the city's investment. In investment in services, investment in industries related to producer services and cultural life increased rapidly. Investment in leasing and business services, education, culture, sports and entertainment increased by 2.0 times, 1.1 times and 18.8% respectively.

January to July, the city's total retail sales of social consumer goods 492.227 billion yuan, an increase of 8.4%, growth was flat. At the same time, consumer prices (CPI) rose 2.6% year on year, PPI fell 2.5%, and purchase prices fell 4.6% year-on-year.

The retail sales of daily necessities, cosmetics, Chinese and Western medicines and gold and silver jewelry increased by 25.0%, 24.7%, 15.3% and 12.2% respectively over the same period of last year, which was in line with the improvement in the quality of consumption and quality improvement of residents. Accounting for nearly 30% of the above-mentioned auto retail sales growth of 6.4% in the first half growth rate of 5.9%.

In terms of import and export trade, the value of imports and exports of goods in Guangzhou from January to July was 463.348 billion yuan, a decrease of 1.1 percent, a decline of less than 3.0 percent of the national and 1.3 percent of the province. Specifically, the export growth rate down, imports fell to expand. However, Guangzhou's cargo throughput, airport cargo throughput, airport passenger throughput, port container throughput growth rate has expanded.

From January to July, the growth rate of revenue and expenditure and the growth rate of total tax revenue all have some callback. Among them, the "battalion change" the full implementation of the impact, which accounted for over 60% of the national tax revenue growth of 5.4%, the growth rate than the first half increased 2.2 percentage points; land tax revenue growth of 5.7% growth rate down 8.1 percentage points.

At the end of July, the deposit balance of local and foreign banks in the banking sector in Guangzhou was 4.52 trillion yuan, up 1.9 percent; the loan balance was 878.562 billion yuan, up 7.4 percent, down 5.3 percentage points and 1.8 percentage points respectively.