Lithium-Ion Batteries’ Sensitive Heat
Over 15 million students are enrolled in fall college classes across the United States according to a US Census Bureau study in 2004. Using that number as a base it can be projected that the fall of 2008 should see a slight up-tick in college enrollees. Interestingly the number of college students that are going to college with hp laptop battery, hp ev088aa, hp 417066-001, hp f4486b, hp cgr-b1870ae have increased by 28% compared to 42% of college students in 2004. This means that nearly 70% of enrolled students are using laptop computers. In real numbers that represents 10,500,000 laptop computers.
Now listen up college students – your laptop battery is more than likely a Li-ion battery and if it is then there is a natural tendency to keep your laptop bta0302001, hp pavilion zd7000 battery, hp pp2182d, hp pp2182l plugged into a wall outlet when you are close to one. You may also find that you are actually “plugged” in to a wall outlet more than you are not and there in lies a problem. When your laptop is plugged into a wall outlet your battery heats up big time and heat and lithium do not mix well together.
Hold on! You have to charge hp 345027-001, hp 342661-001, hp pavilion dv8000 battery, hp hstnn-db20. Yes that is true, but you do not have to keep your laptop plugged into a wall outlet for the entire school year! But won’t that reduce my battery life if I’m constantly powered from the battery?
Your battery will diminish in capacity – the ability to charge and power your laptop. That is a fact and a natural consequence of battery today. This diminishing power performance is called battery degradation and power loss. I have written on this topic before and you can read about it on my blog but on a high level a hp 395789-001, hp 396008-001, hp pavilion dv9000 battery, hp ev087aa battery over time degrades and eventually stops working, this is no surprise, and it occurs due to the following technical processes: declining capacity, increasing internal resistance, elevated self-discharge, premature voltage cut-off on discharge.
So should you constantly keep your battery charged at 100% capacity? No you should not. Why? To answer that question let’s look at what is occurring when you charge a battery. When charging your battery you are forcing electrical current into a battery cell from a charger. The force of electrical current causes temperature increases.
Now it is true that contained within your laptop battery are integrated power management circuits that are designed to protect against over-voltage and under-voltage conditions that increase heat in the hp ex942aa, hp pavilion zt3000, hp 337607-001, hp 337607-003 but one factor of how well a battery is being protected during a charge depends on the ratio of the heating rate versus the dissipation rate. If the heating rate is higher then the dissipation rate then thermal runaway will occur (leaking, smoking, gas venting, flames).
Now don’t go into panic mode since the integrated circuits are really good at keeping the heating rate lower than the dissipation rate and you are in extremely minimal danger of thermal runaway occurring.? But the practice of keeping your battery charged continuously can negatively affect your battery’s longevity. So charge your battery and then run your laptop on dg103a, 398876-001, pb992a, pb994a, pb991a power until you have to charge it again.
How Many Cells Are In A Battery(b)
What Type of Lithium Cell is Used in Laptops
Now this brings us to battery cells and our original question from the reader. Lithium based battery cells are good but there are a variety of lithium based battery cells. For example the lithium based cell identified as 18650 is one of the most common hp pp2100, compaq presario r3000 battery, hp pavilion zv5000 battery, hp pavilion zv6000 battery cell on the market for laptops. 18650 is manufactured by many manufacturers including many private branded companies to public companies like LG, Sony, Sanyo, Samsung, Panasonic.
18650 is a 3.6V cylindrical Li-Ion cell. 18650 has no memory effect (distinguish between digital memory effect) and longer storage life than NiMH battery cells. 18650 is light weight and has a high energy density. It is in effect perfect for building batteries for laptop and other portable power devices.
The additional technical specifications for the 18650 batteries cell include:
Nominal Voltage Average 3.7 V – the concept of nominal voltage is that voltage range exists depending on the number of cells in the hp pavilion dv1000 battery, hp pf723a, hp pm579a, hp pavilion dv4000 battery.
Nominal Capacity - 2200 mAh (above 2200 the stability of lithium based cells is called into question)
Max. Charging Current - 2.4 Amps Max.
Max. Discharging Current - 4.6 Amps max.
Dimensions (DxH) 18.3 mm (Max 18.4) x 64.9 mm (Max 65.1)
Weight 46.5 g (1.64 oz)
Internal Impedance Internal Impedance: less or equal to 90 ohms
Cycle Performance is 80% of initial capacity at 300 cycles
Now as stated above the reader asked how many cells were in the Toshiba Satellite M105-S3041 Laptop Battery? The battery is rated at 10.8 volts and a capacity of 8800 mAh.
As I mentioned above the nominal voltage average is 3.7V. Some manufacturers may use 3.6V and some may use 3.7V. In the case of a laptop hp pavilion ze2000 battery, hp presario m2000 battery, hp presario v2000 battery, hp pavilion dv2000 battery with 10.8V the nominal voltage rating used is 3.6V. Thus if we divide 10.8V by 3.6V we get 3. Thus 3 cells in a series. We also know that the batteries capacity is 8800 mAh. We know the nominal capacity is 2200 mAh. Therefore if we divide 8800 mAh by 2200 mAh then we get 4 in parallel.
Therefore we have 3 cells in series X 4 cells in parallel equals 12 cells in total.
How Many Cells Are In A Battery(a)
The question from the reader is a great question for it gets to the heart of hp 367759-001 , hp hstnn-lb31 , hp 338794-001 manufacturing and begins to unravel the power of a battery. The answer is simply: 12 cells. But what does the answer mean and how does the number of cells relate to the overall value of a battery? Let’s find out…
What is a battery and how does it create energy?
A battery is a device that converts chemical energy into electrical energy. Hp f4098a, hp f4809a, hp f4812a, compaq presario 2100 battery have two electrodes, an anode (the negative end) and a cathode (the positive end). Collectively the anode and the cathode are called the electrodes. What is positve and what is the negative terminal? It would be great to simply say that the anode is negative and the cathode is positive, however, that is not always the case. Somtimes the opposite is true depending on battery technology.
In between the battery’s two electrodes runs an electrical current caused primarily from a voltage differential between the anode and cathode. The voltage runs through a chemical called an electrolyte (which can be either liquid or solid). This battery consisting of two electrodes is called a voltaic cell.
Therefore compaq presario 2500 battery, hp f2299a, hp f3172a, hp pavilion zt1000 battery in effect create electrochemical energy. In order to convert chemical energy into electrical energy there is a chain of events that have to occur prior to the creation of electrical energy. Key to the creation of electrochemical energy in batteries is that electrical energy is injected into two chemicals in a solution. Electricity is introduced into a battery via a charger. The hp f2019, hp f2019a, hp f2019b, hp omnibook 6000 battery acts as a conduit of the pushing electrons that are forcing their way into the chemical lithium. This charge process involves intercalation: the joining of a molecule (or molecule group) between two other molecules (or groups). Intercalation is the process of ions being pushed by electrical current into solid lithium compounds. Lithium is one of the chemical components used to create electrical energy in batteries. Lithium compounds have minuscule spaces between the crystallized planes for small ions to insert themselves from a force of current. Ionizing lithium loads the crystal planes to the point where they are forced into a current flow. Intercalation replenishes, in effect, lithium but the net result of ionization is the ultimate depletion of the lithium reactive property. You could say if you use it you will lose it!
But what makes lithium good for batteries is that hp f1739a, hp omnibook xe battery, hp f2024b, hp f2024a is one of the metals in the alkali group (the other metals include Sodium, Potassium, Rubidium, Cesium, and Francium). Lithium is a highly reactive metal. Lithium has only one electron in its outer shell (two electrons in its inner shell), which makes it chemically “ready” to lose that one electron in ionic bonding with other elements. Lithium is used as a battery anode material (due to its high electrochemical potential).
Mobile Phone Battery Repair Instrument Design and Application(b)
Charge phase of our relationship with the general charger and different frequencies are used by cyclical changes in the pulse signal to the rechargeable batteries. Mainly taking into account the pulse signal can be hp laptop battery chemicals gradually activated, the battery factory to achieve results. Similarly, when they should not charge more than the termination value of charging voltage, over-charging of the battery may cause permanent damage.
Third, the production process
(A) discharge circuit design
1, the design requirements
① the general desirability of the hp ev087aa, hp ex942aa battery discharge current of 0.2 times the rated capacity.
② must accurately grasp the discharge termination voltage, so as to avoid over discharge the battery and injury.
③ manually conducted on discharge Kai, stop control.
2, the design features of
① battery discharge voltage to the termination should be automatically disconnected loop or automatic discharge into state-of-charge.
② facilitate hp pavilion zt3000, hp 337607-001 discharge monitoring job status.
Following discharge circuit design concept map:
Discharge circuit
Driver circuit may be part of two relays form a self-locking circuit, the discharge end of the disconnect switch automatically transferred to the charging part.
(B) charging circuit design
1, the design of indicators
① adjustable constant-current charge, maximum charge current 500mA.
②Over discharge automatically into a state of constant-current charge.
③ charge to end-of-charge voltage, constant current circuit to stop working, and lock in "Charging The End" state.
2, the design hp 337607-003, dg103a features of
① the use of voltage comparators to monitor the battery voltage, to ensure that end-of-charge voltage when the charge current and timely turn-off and lock in "Charging The End" state.
② automatic and manual features Kai, both stop function.
Charging circuit with the pulse signal combining circuit for charging. The 555 timer pulse signal can be used to achieve, with 3 555 to constitute a frequency change in the cycle pulse signal. Circuit diagram in Figure.
Required to connect the entire circuit has a logical relationship which can be used with the door to non-implementation, in the design, we have adopted a 4012 four door 398876-001, pb992a with non-phase input.
Mobile Phone Battery Repair Instrument Design and Application(a)
1 Introduction hp laptop battery
Required the development of contemporary society, almost everyone in the use of mobile phone, mobile phone has become an indispensable daily necessities. And people in frequent use, have gradually found that cell phone batteries can not meet our demands, often in use for some time after the emergence of electric charge does not go in, shorter discharge time situation. Just a good rechargeable batteries, no electricity no time, and thus a cell phone hp pp2182l, hp 345027-001 battery repair repair instrument on was born.
Second, the design principle
(1) introduction of mobile phone batteries
Is now generally used mobile phone batteries for lithium-ion battery. Mainly due to lithium-ion hp 342661-001, hp pavilion dv8000 battery are lithium-ion (Li-Ion) and lithium polymer (Li-Pol), battery with light weight, large capacity, small resistance characteristics. But we need to in accordance with the characteristics of its charge, otherwise, its damage and will have a significant number of its rechargeable will greatly discount.
Rechargeable lithium-ion in the process should not have required the attention of charge and over-discharge, it has its own minimum voltage and maximum voltage, the general minimum voltage between 2.2V to 2.3V, the maximum voltage between 4.2V to 4.3V, so we in the design of the circuit when necessary attention to setting discharge termination voltage and hp hstnn-db20, hp 395789-001 charge termination voltage.
(B) design
The design of the circuit is mainly divided into two stages of discharge and recharge. General battery charger is only charging easy, and the repair Miriam many a discharge process.
Discharge phase are first the residual hp 396008-001, hp pavilion dv9000 battery power completely release and discharge voltage reaches its termination value. Discharge phase discharge voltage termination of the value of attention to the settings, if carried out on the battery discharge, the battery will cause great damage.
UPS Power Supply(d)
Therefore, the proper use and maintenance of a good hp laptop battery, it is essential.
(1) every 4 to 6 months to check a battery in the battery terminal voltage and internal resistance, if a single hp omnibook xe3 battery terminal voltage is lower than the minimum threshold voltage or the battery internal resistance is greater than 80mΩ should be a timely replacement or a balanced charge.
(2) to avoid over-current charging and over-voltage charging. The former will damage the internal positive and negative battery plate so that the battery dropped; the latter would electrolyte hp hstnn-db02, hp dp390a batteries substantial electrolysis of water, so that the electrolyte concentration increases, resulting in shortened battery life, and even burn.
(3) avoid using fast charger charging, the battery would otherwise in the "instantaneous over-current charging" and "transient over-voltage charging" state, resulting in hp pp2100 battery damage or even decline in the availability of battery power. Should be used with the value stream and value the role of pressure Charger.
(4) to avoid short-circuit discharge or excessive discharge. Otherwise there would be serious damage to the rechargeable compaq presario r3000 battery, hp pavilion zv5000 battery capacity and charge storage capability, and shorten the service life. Battery discharge, it is necessary to timely recharge.
(5) UPS long-term electric power supply in the city state, shall from time to time on UPS power supply for a man-made power outages so that UPS power supply in the inverter mode of operation for some time to activate the battery charge and discharge hp pavilion zv6000 battery capacity, extending the use of Life expectancy.
(6) UPS long-term when not in use, from time to time have to recharge once. Battery charging time interval with the ambient temperature is closely related to the higher temperature, the hstnn-db02 shorter the charging time interval.
(7) The battery should be 30 ℃ 1 O ℃ ambient temperature use. Ambient temperature too high and will shorten their useful life; too low, the release of the electricity will be presario r3000 battery significantly reduced.
(8) UPS in battery-powered state, due to the battery voltage is too low and automatically shutdown, reboot at this time can no longer continue to use to avoid battery damage due to excessive discharge.
(9) UPS is in pavilion zv5000 battery-powered mode, the battery discharge current should not be too small, otherwise it will create rapid shorten battery life and battery internal resistance anomaly increases.
4, UPS's purchase
(1) to confirm the type of UPS needed for financial, securities, telecommunications, transportation and other important industries, should choose performance, safety of online UPS; for Internet users, in addition to consider-line omnibook xe3 battery UPS can also choose online interactive UPS; for home users the option of back-up type UPS.
(2) to determine UPS requirements for UPS power of the power calculation methods are: UPS power = actual power × factor of safety equipment. Among them, hp hstnn-ub02 the safety factor is the large equipment start-up power, usually 1.5.
(3) considering the development of headroom in addition to take into account the actual load, the equipment should also consider the future increase in capacity brought about by the problem, so hp zv5000 battery UPS power should be in the existing load on the basis of a 15% increase in the margin.
(4) select the best choice of brands and after-sales service warranty long, thoughtful and timely after-sales service UPS. In this compaq r3000 battery way, product suppliers can be easily carried out their products and timely maintenance and repair, thus ensuring the user's normal use.
Exert the greatest potential for new battery(b)
Unplug the external power supply when the hp f2019, hp f2019a, hp f2019b battery
Most people in the use of external power supply when the battery removed, only a handful of the use of external power supply when the batteries are placed on top of their brand names are used for several international brands.
In fact, the hp omnibook 6000 battery is removed, the contradictions mainly concentrated in the use of external power supply when the battery is charging up the issue. We should know that the number of battery charge and discharge is directly related to the life of lithium batteries in general set the number of charging and discharging are fixed number of charge cycles only 400-600 times, specially improved products but also 800 times, once for each rechargeable battery to retire a step forward. First view is nothing more than fear of the use of power, the battery will be conducted on the above charge, not only increase the number of charge cycles, but will also cause overcharge. The second view is that the hp f1739a battery is full of electricity on the computer, when using external power supply is not rechargeable.
In fact, these two viewpoints has its right side, but also has the wrong places. Since this is only the views expressed by individual people, not very comprehensive, the author, after investigation, is now a lot of notebook manufacturers have to take into account the vulnerability of the hp omnibook xe battery, and add in their products for protection of battery technology, and therefore the corresponding different brand notebook batteries charging protection technology on different, like some large manufacturers in this regard to do very well, such as: IBM, HP, Toshiba, Compaq, etc.. Consider the most thoughtful of them are IBM, IBM's laptop can detect the battery discharge situation, ThinkPad notebook battery power only in less than 95% of the time will automatically recharge. This battery can play a very good protective effect, at present, many other manufacturers have to follow. So like this battery, you do not need to use when drawing down, because only when the power is lower than 95% of the time it will charge. Nevertheless, such a long time if you are using your computer, or the battery removed to better long-running laptop because of heat generated when the battery will cause a certain degree of harm. However, some other "little brand" laptop hp f2024b, hp f2024a batteries, may not enjoy such treatment, because it has not done inside the battery protection technology. I like to use a certain brand of laptop, if the battery is full of electricity on the top, in the use of external power supply must certainly recharged, the battery storage because there will be wear and tear, it is impossible to achieve 100 percent, and long as it is not 100% , power supply connected to the charge. Each access to external power supply is equivalent to a battery charge, although only a small charge will be the time. Therefore recommended the use of a time when everyone in their own machines in accordance with the circumstances of the case, look in the notebook specification, select the use of external power supply when the hp laptop battery is removed.