New Battery Choice

2.4 The battery charge retention

The battery is fully charged, in accordance with the 1C, room temperature, put aside 28d after the battery discharge with 1C, the results presented in Table 1. Can be seen in Table 1, the retention rate of battery charge of 90%. fpcbp121ap fpcbp73ap fpcbp95

 

2.5 battery internal resistance

Battery tester with internal resistance HIOKI3554 resistance internal test, sampling 1000 random battery internal resistance, internal resistance distribution in Figure 5, in which the resistance of the internal battery of 8.0 ~ 9.9mΩ accounted for over 98% of the total number of cells.

 

2.6 Test Cycle

Battery in the range 23 ± 3 ℃ under 10C discharge with 1C charge voltage, loop test 3.65 ~ 2.0V. Figure 6 is a curve of the cell cycle, circle 400 times, 80% of its holding capacity, the battery has a high performance bike good.

 

2.7 Safety Test

The lithium-ion batteries used in power tools are used to protect the safety board battery protection, but in practice the protection board can not use 100% reliability. And also the charger may encounter many unexpected failures or other. This requires that the lithium-ion battery should have a good abuse situation and the affordability of accidents. Our power tools lithium iron phosphate process of developing lithium-ion battery had been charging the battery, short circuit, acupuncture, extrusion, heavy items such as crash tests. FRU 92P1141 battery 40Y6799

 

2.7.1 Overloading

The battery is fully charged with 1C, in accordance with the 3C 10V to test overload overload, Figure 7 is a battery charge when the voltage curve. One can see from the figure, when the battery voltage up to 4.8V charging time when the stable for some time, about 9 minutes, the battery voltage has increased rapidly, when to 7V, flattery remove the battery voltage quickly dropped to 0V. The battery is not fire, explosion.

 

2.7.2 Short circuit

The battery is fully charged with a resistance less than 50mΩ wire to the positive and negative, measuring the surface temperature of the battery, the maximum surface temperature of the battery 140 ℃, open the hood, the battery n ‘ no fire, not explode. Compaq Tablet PC TC1100 battery Compaq presario C700 battery

 

2.7.3 Acupuncture

Will fully charged battery attached to the jig, and with a diameter of 3 mm of the needle pierces the battery in the radial direction. Figure 8 is a battery status of acupuncture. The battery is not fire, not explode.

 

2.7.4 Extrusion

Will fully charged battery on a flat surface, is given by the hydraulic jack 13 +1 KN extrusion pressure from the steel rod with a diameter of 32mm flat extrusion cell, once the maximum pressure extrusion compression stop. Figure squeeze the battery status. The battery is not fire, not explode. Compaq presario V5000 battery Compaq Tablet PC TC1000 battery

 

2.7.5 serious consequences

The battery is fully charged, placed on a flat surface with the vertical diameter of 15.8 mm steel columns at the center of battery, will the weight of 9.1 kg in a free fall height of 610mm above Columns of steel drums. Figure 10 after the heavy impact of the condition of the battery. The battery is not fire, not explode.

 

Conclusion

Power tools, we have developed lithium iron battery lithium-ion phosphate may discharge 20C continuous, 30C pulse discharge, high temperature and low temperature -20 ℃ 55 ℃ under continuous 10C discharge capacity nameplate capacity, respectively 95% and 85%, has good performance and low temperature high. 28d battery charged to maintain the temperature at 90% or more. AC internal resistance of less than 10mΩ. cell cycle at room temperature, 10 ° C of 400 to keep more than 80% capacity, performance bicycle excellent high and high security to meet the requirements of power tools. Compaq presario V2000 battery Compaq presario V4000 battery

Like cadmium cylindrical high-power – nickel have excellent performance at high discharge speed of dominance in the market, but because of pollution problems are gradually withdrawing from the stage of history, but the power of tools market growing rapidly around the world working to develop a power tool use lithium-ion batteries environmentally-friendly batteries to replace nickel-cadmium batteries. Green lithium-ion battery with high specific energy, specific power, the small high self-discharge, charge efficiency, the working temperature, and characteristics of pollution-free, performance is far superior to batteries nickel-cadmium. Lenovo ThinkPad T400 battery Lenovo ThinkPad T400s battery

 

In recent years, a number of lithium-ion battery of powerful tools designed to power. Used in these batteries LiMn2O4 and ternary materials, where the security of the poor in the use of power tools is limited. The structure of olivine LiFePO 4 has been reported since, made a series of research results, the domestic and foreign manufacturers have already begun mass production of number of LiFePO4, is LiFePO4 cathode materials for battery production pave the way for. We use lithium iron phosphate as cathode material for the production process of the battery has been designed, developed independently of the ability of l100mAh can be used in power tools in lithium-ion 18650 standard, now the process battery production and properties are introduced.

 

1. Experience

1.1 The design of the battery

For 18,650 batteries discharge high-speed multi-pole, thick baseband, while not in the combination of blocks in the TPC, increase the amount of conductive agent. Welding ultrasonic welding. Down with spot welding. Copper subcontracting, which increases the contact area cathode and steel, to reduce ohmic resistance. fujitsu lifebook t4010 battery fujitsu lifebook t4010d battery

 

1.2 Preparation of cells

Hang with the Suzhou Science and Technology Co., Ltd. is the production of lithium phosphate-iron D1S type cathode active material, manufactured by Shanghai Shanshan Tech Co., Ltd. Carbon G10 mesophase microbeads based anode active material The diaphragm is Celgard2320, electrolyte Cathay Pacific China Zhangjiagang City Wing production of new chemical materials Co., Ltd. LiPF6, a combination of blocks with special structure, in accordance with – the technical requirements set 18,650 power-type was prepared iron lithium battery lithium ion phosphate.

 

1.3 Performance Test

With the battery tester performance test BS9360 single cell. Battery tester using internal resistance HIOKI3554 test battery internal resistance. OZ-702 detector test performance single battery temperature, the temperature performance OZ-E-2250 detector test low individual cell. fujitsu lifebook t4020 battery fpcbp121

 

2 Discussion

2.1 Battery charge and discharge characteristics

single cell at room temperature in SC charge constant current constant voltage charging to 3.65V cut-off current of 0.02C, then 1100mA constant current discharge of 2.0 V, is a battery charge and discharge curve LC . Total cost of time is 113min, constant current charging time of 54.22min, the carrying capacity of 994.88mAh, which represents 85% of the total load.

 

2.2 The development rate of discharge of the battery

Power tool batteries with lithium-ion batteries require execution of a good rate of electricity, and high (30 ° C or more) of the pulse discharge performance. Figure 2 shows the performance of different rates of discharge, the discharge termination voltage of 2.0V. Batteries with different flow rate increases when the discharge platform decreased gradually but the battery in the rate of 10C in spite of a high platform with 3.05V, 20C fully discharge rate battery discharge with a good performance. Compaq presario CQ50 battery Compaq presario CQ60 battery

 

To study the quantity and the relationship between the very ear discharge capacity of the battery, the density of paved surface itself were produced under conditions of both positive and negative ear and are negative for both ears are the three Battery discharge under different rates of surface temperature were tested.

 

2.3 The high performance and low temperature batteries

Power tools used in lithium-ion batteries used in a wide temperature range, typically -20 ~ 55 ℃ under normal conditions of use of the battery can. Thanks to the improved formulation, adjustment of the cellular structure, optimize the composition of the electrolyte and other methods to improve battery performance and low high temperature of the battery at different temperatures to 10C rate discharge completely . The battery is fully charged under normal conditions, placed in incubators to cancel 8am, in this state, 10 ℃ discharge to 2.0V. Figure 4 is the discharge curves of battery 10C different temperature. The amount can be seen in -10 ℃, -15 ℃, -20 ℃ to test the battery voltage when the arc apparent, but did not meet the voltage settings Minimum battery discharge, and then increase as temperature battery, the battery voltage to rise, the normal exercise of the battery can. At -20 ℃ or so when the battery voltage dropped to 2.2 V, close to 2.0V, the discharge affect battery performance. Compaq presario CQ40 battery Compaq presario CQ45 battery

National Development and Reform Commission, Mr Li Junfeng, deputy director of the Institute of Energy Research at the meeting made a “policy where the domestic PV industry development trend,” keynote address, The following is the conference registration: sony VGP-BPS9A sony VGP-BPL11

 

Li Junfeng: I mean last year, judging this year and years to come. The level of national development at the national level, future trends. 07.08 hard in my solar energy, we show a very low level in 2008 when I said no problem.

 

07.08 In the first half was especially good for solar development phase, but 08.09 in various industries of the financial crisis on a serious blow. After a rapid development of new energy industry in a good step, but for some industries, such as LEDs, the dollar was last down more than 90 to 10 a few dollars, has not rebounded. Global investment trends, despite the financial crisis so severe, in investments in new energy which has been sustained growth.

 

Energy from China for 25% of global investment, which is a foreign body in the analysis, but my analysis is that this figure overstates the investment capacity of China, and why, the first low-power U.S. wind better than China, Germany, to 4.3 billion, more than 100 billion dollars. sony VGP-BPS8 sony VGP-BPS9/B

 

It is within the wind energy, followed by the development of solar energy.

 

The development of wind power in the classical phase, not the few countries in the game The end of 2009, when 87 countries around the world engaged in wind energy.

 

Photovoltaic power generation, the challenges and opportunities, despite the influence and the rapid development of PV, 07.08 years increased by over 70%, but increased after the financial crisis, more than 40% . But the opportunities and challenges, such as solar, wind, wind energy has a constant market for solar in 2007 with the support of Spain, the support of Germany in 2008, which is a big problem, 2010 when the problem is more important. Increasingly rapid development of wind energy, our country has doubled in 2009 compared to 2008, reaching 2.5 million. Crazy later this year, I first thought, when the PV output end of the year for further consideration from 700 to 800 million kilowatts, nearly 500 million kilowatts in the first half, which is relatively high estimate. This is a concept, growth in the first half of births in most countries last year. sony VGP-BPS5 Lenovo ThinkPad X200 battery

 

But our capacity is skyrocketing, all equipment purchased this year by the end of a conservative estimate is 1500 million kilowatts, such a development, industry accounts for China to nearly 60% -70% level, which leads to a problem? First, prices for raw materials, including the United States on anti-dumping investigation in China, we strongly oppose, but careful thought for a moment, a country accounting for 60-70% of world market, the industrial development of other great threat, so anti-record, if the photovoltaic industry has been very difficult.

 

Now look at the development of our country, with two words, is that the market was very hot, relatively calm and the government, especially the central government, whether the planning of new energies Ye Hao, strategic planning, both mean thunder and heavy rain Petit, one of the reasons why the market is hot, which is the political market is not a big impact, for example, the call for tenders Minutes of 28 MW, the minimum is 0,728 yuan in electricity prices, electricity prices in the state has a large impact, PV electricity is 1.5 gross, in fact, we can find a balance. 40% look bad now, how do we balance point, which one is correct, the more trouble. Compaq Presario B1900 battery Compaq Presario B3000 battery

 

There are indicators of development, the state’s 2020 goal of 2 million kilowatts, and for now the international market, we started, how national policies are difficult for the country’s development situation, not much change in the policy on the trend of future development, it can be said for international companies, including Germany and the United States, including the political leadership is good.

 

In particular, recently made a very good reflection of price increases directly to the stability of the PV market, followed by China, India, the United States. Our countries have negative effects and some good news.

 

We did the research report, we think the price is 6 Hair Sea more than 4 cents of land can do so when the national political dilemma. Wind energy is also a big problem for the international community expects the first fight, wanted to be the first new energy technologies, the U.S. is that we seize the opportunities to develop new energy sources, and now the government’s willingness is not enough, because of hesitation or government, large corporations and more adventurous, our photovoltaic 60-70% of the world, with China’s Taiwan region is over 70%. Compaq Presario B1200 battery Compaq Presario B1800 battery

 

There are issues of development, Guangdong Province, we develop new energy sources to consider in the process of globalization, not a region, we are the country, north and center of intensive development, such as Jiangsu , Shanghai, Hebei, central regions of Sichuan, Hunan, Hubei, on the formation of a great new energy challenges, advantages and disadvantages of this issue, I also said that East and West have area of uneven development in Guangdong, for example, Sanshui, of course, is faster than in terms of the West, how to balance.

 

We say that Taiwan, the industry concentration, total world production of 10-25%, only two thousand people, all the way to Beijing, Shanghai, Germany is the same, it is difficult to judge which is better , but we all have opportunity, or will, the future is bright, long way to go, it is difficult to judge. I think it should be the long-term accumulation, the market has a bright future, we need long-term efforts, not blind optimism, which have the photovoltaic industry in particular, rational judgments, we accounted for 60-70% of the global market, but I think as long as the Chinese do not, I think the best way to maintain 60-70%, I think it is rational, if accounted for 100% is to go to death, we were looking for balance, but was not found. Compaq 510 battery Compaq 610 battery