Battery Help » rechargeable batteries

Knowledge of rechargeable batteries

admin — Thu, 19 Nov 2009 01:32:56 +0000

Firstly introduce a few simple formula, the basic electricity hope to make no electronic background readers to a few physical phenomena.
Voltage (V) = current (I) x resistance (R),
Charge (Q) = current (I) x time (T),
Power (P = V x I =
Energy (W) = P * T = Q x V
Any object has impedance, plus a potential difference in both impedance will produce charge through the impedance, the impedance is unit of time (a) through the charge quantity smaller, impedance is unit of time through the charge quantity. If the potentials are unit time increases the flow volume of charge will be reduced, while magnetic unit time through the charge quantity is less. The potential difference voltage (V), called for volts (V) unit, unit of time through the charge quantity amount called current (I), unit for (A), impedance ampere resistance (R), called in ohms (.). The current (I) that flows through the unit of time, the number of charges in the flow resistance in T seconds altogether has the number of charges by T, I used to describe how the charge quantity of nouns for charge (Q), commonly known as the power, the unit is called the coulomb (Q). Resistance of power consumption (P) as I * V, unit for watt (W), representing the power the power consumption. , the energy consumption (W) for P * T, unit for the joule (J), the longer the time the same energy consumption, and the energy consumption of power consumption is bigger also.
Example: a tree in the dry batteries 1.5 V, consumption of 0.5 bulb, power consumption for triple-a current for 4.5 W, 10 seconds altogether through the coulomb’s charge, 30 45 joule energy consumption. Nickel cadmium battery material classification of battery has a lot of kinds, in chemical battery charging in just throw a battery, the battery can be called again use rechargeable batteries repeatedly called secondary battery, the battery is nickel cadmium and alkaline battery in the secondary batteries belong to one. Nickel cadmium battery anode materials are used in QingYangHuaNie oxygen, cathode using cadmium compounds active substances, electrolyte is the use of potassium hydroxide alkaline solution, etc. As for nickel cadmium battery, will be produced in the above, in QingYangHuaNie anode and cathode metal cadmium, thus it has formed in at the potentials. Will nickel cadmium battery anode and cathode ends when discharge, Yin external load extreme charged by external load flow of electrons, therefore to provide energy for anode external load consumption.

Second, excessive charging
In the process of charging the battery voltage increases with the increased power storage battery storage rise gradually, when the electrode material of saturation power battery, if cannot continue to charge, electrolyte, and will produce in the electrolysis anode and cathode generate hydrogen in oxygen, so will the internal cause in sealed battery, will rise to internal pressure inside the cell damage structure. Like this kind of phenomenon called excessive charging.
In order to avoid excessive rechargeable batteries, usually by the damage of the cathode production capacity will be better than the anode, large capacity, such as excessive charge anode can produce oxygen saturation and first, and the cathode is not saturated and won’t produce hydrogen and oxygen to produce spread to the anode and cathode after charging produced metal cadmium absorbed oxygen react, and the reaction rate and metal cadmium speed balance, so can effectively avoid the battery pressure. But if the charging current (use) will be quick charge the battery loses his balance, the pressure inside the battery will open valve, hydrogen and oxygen to battery leakage will reduce external pressure relief valve closed until just sealed battery again. But the gas leakage has made chemical material, reducing internal cause of battery life.

Teach you correct charging

admin — Wed, 11 Nov 2009 00:28:28 +0000

Teach you correct rechargeable batteries) series of nickel (a: avoid overcharge
In charge, the most important yes make batteries and however. In the use of quick charger, choose a quality cont-rol, can precisely control the charger is key to recharge current. But the constant-current charger (slow filling) no control circuit, we need to recharge the battery capacity and different, according to the current “charge time = 150 C/charging current” formula calculates, avoid excessive rechargeable battery cause damage to the battery. For example, battery capacity for 1000mAh, charger, just 130mA for charging current charge for 1.5 * 1000/130 = 11.5 (h
Teach you correct rechargeable batteries) series of nickel (2: in pairs
In use rechargeable batteries, suggest you had better be with the brand, with a capacity of the battery, with annual awards for the same kind of equipment, and put them together in charge. Had better not mix of different brands and the capacity of the battery. This is mostly out on the market cost and volume of the charger, not on a single battery charging and independent control of independence, but two batteries series after the same group of charging and access control circuit. This series of two batteries charging electric current and charging time are the same, if the two different series, or batteries battery capacity in the soc have differences, including capacity smaller or more battery remaining power must first full of electricity. Such batteries due to another team has filled, charger will continue to batteries, which inevitably leads to the full power battery overcharge, heat, thereby, serious damage to the battery or explosion. (this view of the charger for now, seemed a bit outdated. Brand charger all support a single charge – I know there is tasted, super
Teach you correct rechargeable batteries) series of nickel (3: reduce memory effects
Chromium and nickel nimh batteries memory effects cannot be ignored, battery capacity with the increase of number of charge. Especially when they used in the DC power larger or camera, when batteries and partner of residual electric power output, already cannot satisfy the requirement of residual electric equipment. Accumulate, will increase battery memory effects.
To reduce battery memory effects, the easiest way is to discharge of rechargeable batteries. For battery discharge also have certain skills. First, absolutely cannot use short circuit batteries are negative or with large current method of discharge NaDianZu rechargeable batteries. Because, when will produce very big short-circuit current which may cause damage to the battery, the battery electrodes. At the same time, large discharge current also can produce a lot of heat, may damage the batteries battery into electricity. The proposal will be smaller devices in nature, such as MP3 or discharge radio. When the equipment used to boot, or when discharge is almost. This is not excessive discharge, also avoid anti-shocking damage.
Teach you correct rechargeable batteries) series of nickel (4: about self-discharge
For rechargeable batteries, especially large capacity rechargeable batteries, self-discharge phenomenon is very serious. Battery in power after the circumstances, without loss of power will naturally. Now some of the large capacity battery 2000mAh above, be full of power, the capacity of 3 days, placed in nominal capacity is half done. Due to the great now self-discharge battery materials and structure of the direct relationship, there is no way to reduce its properities coefficient, so we can only by changing used to solve this problem
Teach you correct charge (5) series of nickel battery charger, fast and slow charger
According to the speed of rechargeable battery charger, can be divided into slow chargers and quick charger. Slow chargers and quick charger and no obvious limits, but and use rechargeable battery chargers and the volume.
Whether or 1600mAh, 1200mAh battery is defined as the capacity are in charge, and Australia is less than 0.1 C charging electric current, Juan flow for charging. Rechargeable batteries for 0.1 to 0.2 C, charging for slow than 0.2. Charge current than 0.8 C C for rapid charging, while charging current more than 0.8 C for super-fast charging. 200mA namely, for the current 800mAh battery, the battery for 0.25 C, for the current rapid charging, for 1600mAh of rechargeable batteries, and its current for 0.125 C, just for slow. (I also saw charging here know how long the definition, filling knowledge!)
Teach you correct rechargeable batteries) series of nickel (6: slow and fast filling their respective advantages and disadvantages
A slow charger
Advantage: the charging current smaller, less heat charging process. Even a short time, the battery charging calorific value is not too large for battery capacity and life, less damage.
Faults: most no corresponding control circuit, cut off power supply, battery charger only will not end charging. Recharge time is too long, can test your patience.
Second, quick charger
Advantages: charging speed.
Faults: in order to avoid rapid charging the battery, the damage of heat at fast automatic charger using various methods to reduce the temperature when charging battery. The most commonly used method is cosine. This method of current like cosine wave variable dissolve the accumulation of heat, so the battery temperature control in a certain range. In addition, in order to solve the problem rapidly overcharge charger typically use the voltage gradient judgment methods to judge whether the battery to fill. When the battery charger, fast to full control of the circuit automatically turn Juan flow of battery charging pattern, Juan flow charging. Juan flow to charge the battery charging very full, also need not worry too, also do not have to go to the calculation time, make quick charger, thus greatly improving the usability and make quick charger price often higher than slow charger.

Ordinary charging the battery

admin — Mon, 09 Nov 2009 00:26:32 +0000

A, charging sense
Here, first, use rechargeable batteries charging is the important step. A reasonable charge for prolong battery life is very good, and he will be for charging brutal has a great influence on the battery life. In an article said that current lithium batteries are basically according to each individual, each of the general, each product also provide their because of charging equipment, universal, when used as follow their instructions can be used. So the paper introduces main battery is nickel cadmium battery and refers to the nimh batteries.
Every cell of nickel nimh batteries and two ways, is known to us all the “quick charge” and “slow filling”. Fast and slow rechargeable battery is an important concept, the fast and slow rechargeable battery can correctly grasp.
First, fast and slow filling a relative concept. Someone once asked me the charger is 200mA, charging electric current is fast. The answer is not absolute, should answer for certain, it is fast battery charging the battery, and for some, it is slow. We judge how fast or slow filling filling?
For example a section 5 of electric capacity for nimh batteries, and another quarter 1200mAH for 1600mAH. We put a battery electric capacity, called 1C is a logical concept, Australia, Australia, the same is not equal.
In charge, charging electric current is less than 0.1 C, we called Juan flow charging. As the name suggests, is refers to the current is small. Generally speaking, charging the battery can Juan flow of filling, without damage, but the battery life Juan flow in charge of time is too long, so rarely used alone, but the combined with other charging ways.
Charging electric current in 0.1c – 0.2 between C, we called slow charging. Charging current than 0.2 C, less than 0.8 C is rapid charging. When charging current more than 0.8 C, we call super-fast charging.
Australia is a logical concept because instead of absolute value, thus filling the quick conversion 1C according to slow filling is a relative value. In front of the 200mA examples mentioned in 1200mAH battery charging electric current is slow, but for 700mAH filling the battery is fast.
Know the speed of concept, we still need to understand the situation of battery charger can correctly charging. On the market at present mainly divided into the charger automatic charger constant-current charger and two

Second, the constant-current charger
Constant-current charger is the most common market from nickel cadmium battery charger, age, we began to use the constant-current charger. Constant-current charger usually use slow charging electric current, its use simpler, only the battery in battery charging of storehouse. Note that the time to recharge the accurate calculation.
In charge of the time have a simple calculation formula: provides hour-by-hour = 150 C/charging electric current. For example: 1200mAH battery, the battery charger, time 150mA current for 1800mAH / 150mA is 12 hours. In many cases, of course not calculate the exact time, we can choose from to recent half an hour with convenient time. Example: the charger to 1400mAH 160mA, for the battery, 2100mAH time for 160mA/about 13 hours without calculation to points.
Constant-current charger of simple structure, stable work, is a good way to recharge the battery life, the effect is small. But it also has its limitation, must first time, along with the increasing capacity of nimh batteries, constant-current charging the time needed to use more long, also brings some inconvenience. Therefore, in recent years, automatic charger also gradually popular
Third, automatic charger
In this fast automatic charger two more and more popular, it has the charging speed, safety features. But some people have doubts about it, for quick charger basic use rechargeable battery, faster flow of these people fear it will affect the battery life. So the actual circumstance how?
First, be sure to large current is charging battery life is very small, in many cases, we have to use rechargeable battery, even ultra-high speed quick recharge current sometimes can achieve 2C or higher. Large current is not real killer cell influence to the battery life-span of current is the hot charging.
We should use the battery than nominal voltage battery slightly higher voltage, and battery charging electric current to produce a back emf will, therefore, is part of the current to offset the potential energy, and freely into heat. When charging electric current is bigger, more energy is converted to heat, temperature is higher. High temperatures of rechargeable batteries are harmful in slow, because the constant-current charger is slow, in charge of heat can be controlled within, so does not need to adopt the special measures. But in the automatic charger, using fast charging flow will produce higher temperature. Therefore currently on the market fast automatic charger using various methods to reduce the temperature of the battery, usually use is cosine method, i.e. not with constant current charge, but like cosine wave current strength, such a change could alleviate the accumulation of heat, which will temperature control in a certain range. Because this kind of chargers will no longer use constant current charge, and past constant-current chargers have obvious difference
Use quick charger, another problem is when charging time if forget, after the stop charging the battery for damage will far outweigh the slow constant-current charger overcharge harm. Therefore, in order to solve the problem too quick charger generally adopted such as voltage gradient judgment method to judge whether the battery methods, the charger is close to full use of the control circuit or IC chip to complete this task. When the battery is close to full, control circuit automatically turn Juan flow of battery charging pattern, Juan flow charging. Using Juan flow of battery charging electric current is obvious, as previously mentioned, Juan flow to charge the battery charging full, secondly, need not worry too, so use such charger is the biggest advantage of time don’t have to. The use of specific method can check their instructions, prevent improper operation.
Quick charger has a branch is high-speed charger, this kind of chargers applications, design, structure and process is very complex, so the price is expensive.
In some special occasions, people need in a very short time, ready to use the battery charger using high-speed. Due to the great superhigh speed charger charging electric current, some even use 2C – 3C certification, the current problems, particularly severe heat using cosine wave just enough, so the battery charger many USES of wave in a cosine after insert a very short discharge this method. This approach can alleviate the potential cost charge current generated heat accumulation, thus further control temperature.
Four, discharge
The article has introduced the rechargeable batteries, memory effects, we also know when memory effect gradually accumulated, can make the actual use of the battery capacity decreased dramatically. To reduce memory effects brought by the negative effect, an effective method is to discharge. Generally due to nickel cadmium battery memory effect more apparent, the proposal is in use repeatedly charging for 5-10 times as a discharge, and the nimh batteries can be better memory effects in charge, and use of 20-30 times after a discharge.
In the market of high-grade charger itself with some functions, but most of the discharge of cheap charger is not discharge function, what should we do? By understanding the discharge principle, we can also trying to cell discharge.
We already know, nickel cadmium battery and the nominal voltage is nimh batteries, but actually, 1.2 V battery voltage is a change of value, as if sufficient electricity, around 120 V around fluctuations. In general 1V – 1.4 V, different brand fluctuates between the batteries due to the different voltage fluctuation, not identical
For battery discharge is using small discharge current, voltage drops slowly, the battery down to 0.9 1V V – between, should stop discharging. It is not recommended to put battery discharge to 0.9 V, doing so will cause excessive discharge, make the battery is irreversible damage, said rechargeable batteries is not suitable for use in the home appliance, it is because of the remote control of the current is small, long time in remote use easily cause excessive discharge. After a correct discharge battery, you will find the capacity of the battery of surprise and restored to the original level, so that the capacity of the battery when decline, had better make a discharge.
To do a simple discharge battery, the method is a small, but DianZhu as load must be used to monitor voltage meter, in case of excessive discharge of change.
For what is the charger, choose quick charger or slow constant-current charger, this basically see yourself. Such as often use a digital camera out of equipment such as friends, should choose quick charger, in order to meet the requirements on time, and can even buy high-speed charger, and USES only listensto equipment friends, constant-current charger can satisfy needs
In the correct knowledge, we must charge after can better use of their rechargeable batteries. Please don’t get bogged down in the rapid charging.

Types of rechargeable batteries

admin — Fri, 30 Oct 2009 02:06:09 +0000

Nickel cadmium (Cd) battery Ni -
Voltage: 1.2 V
Life is: 500 times
Discharge temperature of 20 degrees: – 60 ° ~
Charge temperature for: 0 degrees ~ 45 degrees
Note: the overcharge resistant ability.

Ni-mh battery (Ni fd-mh)
Voltage: 1.2 V
Life is: 1000 times
Discharge temperature of: – 10 ° to 45 °
Charge temperature for: 10 degrees ~ 45 degrees
Note: the maximum capacity is 2100mAh around.

Lithium ion battery (Li lon) -
Voltage: 3.6 V
Life is: 500 times
Discharge temperature of 20 degrees: – 60 ° ~
Charge temperature for: 0 degrees ~ 45 degrees
Note: light weight more than 30% ~ 40% nimh batteries, 60% higher capacity nimh batteries. But, if not overcharge resistant to high temperature can cause overcharge > = destroyed structure.

Li-ion polymer battery (Li), polymer -
Voltage: 3.7 V
Life is: 500 times
Discharge temperature of 20 degrees: – 60 ° ~
Charge temperature for: 0 degrees ~ 45 degrees
Note: the lithium electricity, no improvement, and convert battery fluid, can make all sorts of polymer solid electrolyte of lithium batteries, shape.

Lead-acid battery (Sealed)
Voltage: 2V
Life for 200-300 times.
Discharge temperature of: 0 ~ 45 degrees
Charge temperature for: 0 degrees ~ 45 degrees
Note: is it is generally vehicle battery (6) into the 12V 2V series, the battery life water for 10 years, but the volume and the quantity is the biggest of all

Common rechargeable batteries

admin — Wed, 28 Oct 2009 02:58:13 +0000

Nickel cadmium battery is an early marker rechargeable battery, for “Ni – CD,” he monomer voltage 1.2 V, common have 7 (AAA), 5 (AA), 1, 2, and industrial models. He is relatively low self-discharge nimh batteries, resistance is small, the price is relatively cheap, Defect is easy produce memory effects. Battery capacity with the most widely used in the 5th (AA) battery, for example, single battery capacity can be 500MAH 850MHA – 600-700MAH mainstream, for the product.
Ni-mh battery is a new kind of high capacity rechargeable batteries, marked “Ni fd-mh”, many of his characteristics and nickel cadmium battery, superior nickel cadmium battery, is expected to replace traditional nickel cadmium battery. Ni-mh battery voltage of monomer, common model with 1.2 V nickel cadmium battery. His virtues are monomer battery capacity, low resistance, no memory effects, Defect is self-discharge higher. Battery capacity also widely used in the 5th (AA) battery, for example, single battery capacity of 1,000-1300MAH, widely used in mobile phone panels and digital cameras in power.
Rechargeable lithium ion batteries are currently polymer is advanced battery, it has the characteristics of high energy density, lithium batteries have light weight, small size, large capacity, no memory effect etc, but rechargeable lithium battery voltage is 3.6 V monomer, not directly substitution universal single day nickel cadmium/nimh batteries and demanding, need to recharge the battery chargers for. Due to the current lithium batteries depend mainly on imports, so the price is higher, mainly used in electronic products in high-grade
We usually need often buy rechargeable batteries are two main ahead. But it was generally lithium batteries battery products sell piece. Charge the battery life about 500 times, if use proper maintenance, can not only greatly extend battery life (many excellent battery can recycle 1000 times above), and make a battery capacity drops in minimum range and control for the users to save a lot of money.