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Previously, many manufacturers produce a variety of products pretty standard lithium ion battery, its maximum load voltage of 4.2 V ± 1%. Therefore, the majority of lithium-ion battery charging current IC was designed to 4.2V ± 1% tight tolerance for loading. IBM thinkpad z60t battery 40Y6799

However, in recent years, a new generation of battery technology lithium-ion has entered the market. They offer high power density, receive more than previous generations of battery charge and discharge, and according to the manufacturer’s different, they come with different charging voltage. This design idea to modify a standard, high-end application circuit charger IC, providing different charging voltage and higher current ratio at the same time, maintaining all functions of the original charger.

In this case, the model is rechargeable batteries manufactured by the system ANR26650m1 A123. It takes work and 3A (1.3C) mode standard load, and be capable of 10A (4.34C) and 3.6V charging voltage for fast charging. Therefore, it represents the voltage range 4.2V to 3.6V, the type of battery. Figure 1 shows the circuit of the (already) at 1-4 lithium batteries designed IC (MAX1737) for the circuit implementation has been modified. By joining the micro-power dual op amp (MAX4163), and some resistance, this change allows you to recharge the battery of 3.6V. apple a1280 apple a1281 apple a1008

In addition, amendments have changed the value of the current sensing resistor (RCS), thus increasing the standard rate (3A) has accepted the A123 battery charge current limit. Displays power components N1, N2, D1, D4 and L1 for the charge current up to 3A.

In addition to 3A of current, the external switch N1-N2 must be assessed as having a high leakage current, however, have a similar voltage drain. They should not generate data in the table that the total recommended values MAX1737 most current switch. If the load current exceeds 3A, the diodes D1 and D4 of the maximum rated current should be increased.

MAX1737 internal charger is set at 4.2 V ± 0.8% tolerance, the constant current mode (CC) to switch to constant voltage (CV). The MAX4163 dual op amp configuration to change the threshold. Amplifier A2 are connected to an amplifier positive phase of 1.16, so that when the input is 3.6V, 4.2V output generated. The output of op amp A2 is connected to the charger terminal BATT (usually a sensor for measuring the battery voltage), so now switch voltage 3.6V Battery Charger DC CV. apple a1012 apple a1022 apple a1060

The entrance to the op amp A2 to be connected to the positive terminal of the battery. If the op amp A2 associated with resistance to a tolerance of 1%, then the error voltage is 3.62 V -1.1% / +1.2%. Tolerance to the use of small case of resistance, this error can approach error Charger (0.8%). Using the charger Vadj (pin 8), you can achieve greater accuracy.

The operational amplifier A1 is configured with a gain of a differential amplifier, the reference voltage (assuming the differential input voltage is zero when the output voltage) the output of A2. A1 output is connected to the part of the AC charger. (CI load sensing the voltage between BATT and CS difference.) Rcs When reduced to zero voltage across, and the BATT voltage difference between the CS also zero. A1 Rcs differential input connected to both ends, so that the voltage across it? IC needs? The circuit gain of 1 copy BATT and CS as a voltage difference between the two ends. By ISETOUT VREF terminal is set at half of the battery to 3.6 V constant voltage of each cell in the output A1 to 0.100 V / RCSΩ load current delivery. toshiba pa3191u-2brs toshiba pa3191u-3brs

Charger input for detecting these changes will affect other parameters, one is allowed to start full charge voltage (when not modified, the charger is 2.5V / per cell). Now put on the use of CC / CV as a factor in switching voltage amplifier A2, to reduce the voltage (up to 2.14V). When connecting the battery voltage is below 2.14V, the charger in the pre-assessment model quality, in which the tenth IOUT to wear until the voltage is increased to over 2.14V. It was only then for the rate of full load.

Maximum dual op amp power supply circuit to charge the battery to the maximum of two sessions. toshiba tecra a7 battery toshiba pa3191u-1brs

Path of future technology

If the lithium battery can not take on the future development of the task of new energy vehicles, which may play a role, then? toshiba PA3285U-2BAS toshiba PA3285U-2BRS

Although there are many national companies to aggressively promote lead-acid batteries, but because of high pollution, this feature makes this product not to be optimistic, when the development of more than a feeling of helplessness. “The refining of metals lead, battery manufacturing, battery recycling process of pollution, only cars on the road when there is no pollution. Can not say that it is clean energy. Lead-acid battery is not a technology should be strongly encouraged. The current lead-acid batteries in China have 45% of production, Europe and the U.S. use, but not manufacturing, not recycling, pollution in China. “Sha Yong Kang said.

However, the fuel cell is the number of experts to examine the direction, there are many global giants continue to send forces in this area. fuel cells is hydrogen and oxygen from air into water by combination of electrochemical processes and generate electricity plants. fuel cell without combustion, no moving parts, with the yield of energy conversion (effectiveness as an ordinary internal combustion engine 2-3 times), no noise, long life, high reliability and maintainability of the good is the only product is water that is truly clean, renewable requirement. In 1994 a fuel cell vehicle came with a little over a decade now, the technology is developing very rapidly. toshiba PA3285U-3BRS toshiba PA3356U-1BRS

Action, the world developing fuel cell technology fuel cell vehicles to a very strong concern. Toyota has announced that the first fuel cell vehicle on the market in 2015. Last year, in September, Toyota, Honda, Hyundai, Ford, General Motors, DaimlerChrysler, Kia Motors and other famous joint statement called on the Government by 2015 to build more hydrogen fuel infrastructure. If this goal can be achieved, from 2015, worldwide there are hundreds of thousands of vehicles running on hydrogen will be gradually reached commercial production. Although the cost of car fuel is still very high, but it really meet the standards of clean technology, the industry, as production expanded scale, the cost Jiangdi a matter of when. toshiba PA3356U-2BRS toshiba PA3356U-3BRS

At the same time, hydrogen has become the safety of all concerned that the subject of this, Zi-Feng Ma responded that issues of security in the world on hydrogen technology very hard, the hydrogen as the petrochemical, metallurgical and pharmaceutical industries important raw materials, storage and transportation have a very good solution. We are 973 project team is involved in the development of hydrogen storage national norms and standards of the International Council, the laboratory’s current bottle of hydrogen reached 70 MPa, where the commercial use only about 35 MPa The safety factor has increased dramatically. In addition, the hydrogen source is varied. Currently in Shanghai, a major difference between peak and valley power, tight supply during the summer, while spring and fall off the electricity supply, electricity peak and valley can use electrolysis to hydrogen. As for the Baosteel Shanghai, Shanghai Petrochemical and other large companies, the product of hydrogen is already a large scale, so the prospects are promising. IBM thinkpad t43 battery IBM thinkpad t60 battery

The general direction, new energy vehicles will inevitably introduce new technologies to promote the expansion of the battery. Zi-Feng Ma believes that the future of fuel cells and batteries or fuel cells and capacitors to be combined, the advantages of combining the two is a good direction. “We know that power is good for the design of fuel cells, the electrochemical reaction of hydrogen by limiting its power output is stable, like loading 60-kilowatt fuel cell cars, slow down or stop when the fuel cell is always at work and storage devices to supplement the electricity when the vehicle acceleration or hill climbing, power, fuel cells can not get from 70 kilowatts to 60 kilowatts of This will be supplemented by the electrical storage device, this combination is conducive to improved dynamic performance. In short, how to choose the guidelines for the board even better in our local Biru Kan and advanced technologies in the United States Michigan University of lithium – such as air batteries for the relatively distant, at age 15 before any major development. ” IBM thinkpad t41 battery IBM thinkpad t42 series battery

Sha Yong Kang believes that the technology of new energy vehicles is very diverse, do not put all eyes are on the battery itself. The concept of new energy sources must be broad, with the concept of scale have new ideas. Perhaps in the near future will be able to find a new liquid fuel, methanol and ethanol can be replaced. Another example is the technology of the wireless energy used in the car. Although there are problems of remote applications, but the Massachusetts Institute of Technology in 2007, when the technology can be illuminated by 2 meters outside the 60-watt bulb, which gives people the dream unlimited. The future, the combination of wireless technology power and the car could be a viable option, unless the measures taken so heavy.

Cars energy is probably the future direction of New Development, after 50 years is likely to disappear from the scene where conventional diesel history. But as the sand Yongkang, said: “The development of new energy vehicles thought to be widened, looking an immature technology can not blindly started production. Can not see the market involved in the project for research funding, grants to state action. “Japan Toyota, Honda and other manufacturers, such as the first decade of painstaking research technology once mature, strong market, other companies can not be far behind to catch up. In contrast, Chinese companies want to bend beyond the field of new energy vehicles, still need to stop. IBM thinkpad r52 battery IBM thinkpad t40 battery

In the new energy vehicles popular today that the four substances of electric vehicles in lithium battery cathode iron phosphate and lithium in a hot concept. toshiba PA3191U-2BRS toshiba PA3191U-3BRS

Since the beginning of this year, the Battle of lithium iron phosphate patent always appeared in the press reports upgrade. Several large multinational companies from Europe and America called lithium iron phosphate has a patent for core technology, they played the patent battle. In addition, the latest media reports, businesses of the battery manufacturer Phostech Canada in the negotiations of China and put forward the registration fee “of $ 10 million U.S., the production of a tonne of lithium iron phosphate pay strict requirements of U.S. dollars 2500.

Patent battle seems to have given the technology has increased more mysterious rings. However, it seems premature to lithium iron phosphate has high hopes, the experts stressed that the lithium iron phosphate battery electric vehicles is not an effective solution. toshiba PA3191U-4BRS toshiba PA3284U-1BRS

“The lithium iron phosphate in electric vehicles in the role of exaggeration.” Science more 973 project plan storage electric vehicles Energy Chief, Professor Zifeng My Shanghai Jiaotong University, said, “The academic standpoint, the iron phosphate and lithium can not be the future of new energy vehicles main battery. Existing materials in lithium-ion battery cathode are mainly four types of iron phosphate, lithium cobalt oxide, lithium manganese oxide, lithium and ternary materials. from a cell voltage of single view, that the iron phosphate lithium and lithium cobalt lower and other materials, lithium iron phosphate, low energy density, a large battery system, the use large scale can be appropriate, more technical argument that must be done. Action on many of our leading companies in the project lithium iron phosphate, easily benefit foreign companies gaps. ” toshiba PA3285U-1BAS toshiba PA3285U-1BRS

Avoid the blind launched

In recent years, the development of new energy automotive market is booming up. The data show that by 2012, China will create 500,000 new energy production capacity of 20,000 car batteries yuan bicycle use (Considering hybrid and pure electric vehicles) the average estimates in the automobile market within the battery could reach 10 billion yuan, equivalent to the current growth market for both a lithium battery. In 2020, new energy vehicles driven global demand for automotive batteries will be over 200 billion yuan. It is undeniable that the Chinese industry of automotive batteries will mark the beginning of a rapid development of the golden opportunity.

In contrast, the hot car market, behind the new energy, battery technology correspondent was increasingly placed on the agenda. At present, the development of new energy vehicles in China shows the arrangement of pure electric vehicles, fuel cell vehicles and hybrid aware of the situation. pure electric vehicles on the market today mainly used in batteries are the nickel-metal-hydride batteries, lead acid and lithium batteries. Is that all technologies are good enough, there are flaws, many laboratories and companies are still improving. IBM thinkpad r60 battery fru 92p1141 battery

Present overall, lithium batteries are still a security problem. Manganese or iron phosphate, lithium, life cycle, reliability, security, loading and unloading of the performance of various defects in terms of there. “Power within recent 2012 (600.627, stock IT) very large number of business plan can be a real breakthrough did not. Lithium batteries into five parts: the cathode material, anode, electrolyte, separator, packaging, each are all important elements are a core technology. which was unbelievable. “Tang Environmental Energy Technology, Institute of Changsha Changshu Yongkang said.

Accordingly, the frenzy of lithium iron phosphate partly reflects the mentality of Chinese companies is now the majority. The technology is not mature yet in a subject, do not put more effort and money spent on technology research, but the choice was quickly launched, it is a waste of resources. IBM thinkpad x60 battery IBM thinkpad z60t battery

In addition, the quality of the internal lithium battery there are still large gap with foreign countries, mainly the production of different decisions. Zhejiang University, professor of chemical engineering and materials science, Lianbang Wang said: “Chinese enterprises mechanization and automation vary widely to foreign countries, many of which are handmade. A battery also can not see, hundreds of batteries in a series, the difference is obvious. Quality consistency is the shortage of the battery. from raw material to product, which has many processes. a number of different products that are not the same quality. 100 batteries, there are two likely not very good. This mode of production the problem, not one or two years to catch up. ”

Yongkang Sand also believes that consistency is not guaranteed a big problem. “The way to make mobile phone battery is because the small cell phone battery. An open electric car 150 kilometers, the storage capacity of 15 kWh to 20 kWh battery, cell phone batteries may be a watt or the equivalent of 15,000 times. Most of our machines and processors to adopt the manual mode, the consistency is not high. Are still very low yields. ” IBM thinkpad r32 battery IBM thinkpad r40 battery