1. What is lithium battery:
Lithium batteries mainly refers to the use of lithium in the electrode material as the main active substance of a class of batteries. In this definition, lithium batteries refer to a class of batteries, including lithium primary batteries and lithium secondary batteries. A battery can not be recharged again, the secondary battery can be used repeatedly charge and discharge. Lithium batteries mainly lithium manganese batteries, lithium-sulfur batteries (of course, there are secondary lithium-sulfur batteries), lithium thionyl chloride batteries, lithium sulfuryl chloride batteries. Watches, calculators, computer motherboard CMOS used in the three lithium batteries, mainly lithium manganese batteries. Other lithium battery in the civilian as if rare. We usually say lithium batteries, such as mobile phone lithium battery, laptop lithium battery, are lithium secondary battery. Lithium secondary batteries also have a variety of, but the most common lithium-ion secondary battery, referred to as lithium-ion battery.
2. Lithium-ion battery history:
Lithium-ion battery history is very short, from 1990 or so SONY introduced the first piece of carbon as a negative material lithium battery has been, but also more than a decade of history. Now there are two lithium-ion batteries on the market, one for the liquid lithium-ion battery, usually in steel or aluminum shell packaging; the other for the polymer lithium-ion battery, referred to as lithium batteries, aluminum composite film is usually used package.
Lithium-ion battery in the structure of the main five blocks: positive, negative, electrolyte, diaphragm, shell and electrode lead.
3. Is there any other difference between primary and secondary batteries?
Another obvious difference is their energy and load capacity, as well as self-discharge rate, secondary battery energy is higher than a battery, but their load capacity is relatively small.
4. What are the advantages and disadvantages of Li-ion battery?
Rechargeable battery life is longer, can be recycled more than 1000 times, although the price is more expensive than the dry battery, but if used frequently, it is more cost-effective. The capacity of the rechargeable battery is lower than that of the alkaline manganese battery or the zinc-carbon battery, for example, they discharge faster.
Another drawback is that because of their near-constant discharge voltage, it is difficult to predict when the discharge ends. When the discharge is over, the battery voltage will suddenly decrease. If you use the camera, suddenly the battery finished the power, you have to terminate. But on the other hand the rechargeable battery can provide a higher capacity than a fraction of the battery. However, Li-ion batteries can be widely used in photographic equipment because of its high capacity, high energy density, and the discharge voltage gradually decreasing as the depth of discharge increases.
5. How does the rechargeable battery realize its energy conversion?
Each battery has the ability to electrochemical conversion, that is, the storage of chemical energy can be directly converted into electrical energy, secondary electrons (also known as batteries) in terms of (another term also known as rechargeable battery), in the discharge process , Is the chemical energy into electricity; and in the charging process, in turn re-converted into electrical energy energy. This process according to the different electrochemical system, the general charge and discharge more than 500 times, and our products li-ion can be repeated charge and discharge more than 1000 times. Li-ion is a new type of rechargeable portable battery. Its rated voltage is 3.6V, its discharge voltage will gradually decline with the depth of discharge, unlike other rechargeable batteries, the discharge is not, the voltage suddenly decreased.
6.Li-ion battery which part of the composition?
(1) battery up and down cover
(2) positive electrode - active substance is lithium cobalt oxide
(3) Diaphragm - a special composite film
(4) negative electrode - active material is carbon
(5) organic electrolyte
(6) battery shell (divided into steel and aluminum shell two)
7. What is the charge limit voltage? Rated Capacity? Rated voltage? Termination voltage?
A, charge limit voltage: according to the manufacturer's regulations, the battery from constant current charging into constant voltage charging voltage. B, the rated capacity of the manufacturer's battery capacity, refers to the battery at ambient temperature of 20 ℃ ± 5 ℃ conditions, 5h rate discharge to the termination voltage should be provided when the power, expressed in C5, Ah (ampere hours) Or mAh (mAh). C, Nominal voltage: used to indicate the battery voltage approximation. D, the termination voltage: the provisions of the discharge termination of the battery load voltage, the value of n * 2.75V (lithium-ion battery in series only with "n").
8. Why is constant voltage charging current gradually reduced?
Because the constant current process is terminated, the electrochemical polarization inside the cell remains the same level at the same constant current, constant voltage process, and then constant electric field, the concentration polarization of the internal Li + is gradually eliminated, the number of ion migration And the speed of performance for the current gradually reduced.
9. What is the capacity of the battery?
The capacity of the battery has the rated capacity and the actual capacity of the points. The rated amount of the battery is designed and manufactured when the battery is specified or to ensure that the battery under certain discharge conditions, should release a minimum amount of electricity. Li-ion specifies that the battery is charged at room temperature, constant current (1C) constant voltage (4.2V) charge conditions for 3h, the actual capacity of the battery is a certain discharge conditions, the actual discharge capacity, mainly by the discharge rate And the impact of temperature (so strictly speaking, the battery capacity should specify the charge and discharge conditions). Capacity common units are: mAh, Ah = 1000mAh).
10. What is battery resistance?
Refers to the battery at work, the current flow through the battery within the resistance. There are ohmic resistance and polarization internal resistance of two parts. Battery internal resistance, will lead to lower battery discharge voltage, discharge time is shortened. The size of the resistance is mainly affected by the battery material, manufacturing process, battery structure and other factors. Is an important parameter to measure battery performance. Note: generally to charge the internal resistance as the standard. Measuring the internal resistance of the battery should be measured with a special internal resistance meter, and can not be measured with a multimeter ohm file.
11. What is the open circuit voltage?
Refers to the battery in the non-working state that the current flow through the circuit, the battery between the positive and negative potential difference. Under normal circumstances, Li-ion is fully charged after the open circuit voltage of 4.1-4.2V or so, after the discharge pressure of about 3.0V, through the battery open circuit voltage, you can determine the battery charge status.
12. What is the operating voltage?
Also known as the terminal voltage, refers to the battery in the working state that the circuit has a current out of time between the battery positive and negative potential difference. In the battery discharge working state, when the current flows through the battery, do not need to overcome the resistance caused by the battery resistance, so the operating voltage is always lower than the open battery, charging the opposite. Li-ion discharge voltage of about 3.6V.
13. What is the (charge and discharge) magnification? The rate
Refers to the current value required for the battery to release its rated capacity for a specified period of time, which is a multiple of the rated capacity of the battery at the data value, usually in the letter C. If the nominal capacity of the battery is 600mAh is 1C (1x), 300mAh is 0.5C, 6A (600mAh) is 10C. And so on. When the rate is also called the hour rate, when the battery to a certain current put its Rated capacity of the required hours, such as the rated capacity of the battery 600mAh, 600mAh current to put its rated capacity to be 1 hour, so that 600mAh current is 1 hour rate, and so on.
14, what is the self-discharge rate?
Also known as charge retention capacity, refers to the battery in the open state, the battery stored in a certain condition under the maintenance capacity. Mainly by the battery manufacturing process, materials, storage conditions and other factors. Is an important parameter to measure battery performance. Note: 100% of the battery charge open after shelving, a certain degree of self-discharge normal phenomenon. In the GB standard after the provisions of LI-ion 20 ± 2 ℃ under the conditions of open conditions under the open for 28 days. Allows the battery to have capacity loss.
15. What are the common ways of charging a battery:
Constant current charging
The charging process in the entire charging current for a certain value, this method is the most common.
2. Constant voltage charging
During charging the charging power supply at both ends to maintain a constant value, the circuit current with the battery voltage is gradually reduced.
Constant current constant voltage charging
The battery first to constant current charge CC, when the battery voltage rises to a certain value, the voltage remains unchanged CV, the circuit current to a very small, eventually tend to 0.
First, two kinds of charging methods often used in nickel-metal hydride, nickel-cadmium batteries, lithium polymer lithium battery charging method generally use constant current constant voltage charging: the battery first to constant current charge CC, when the battery voltage to a certain value , The voltage remains unchanged CV, the current in the circuit is reduced to a small, and eventually tends to zero.
Since the lithium ion battery has a high energy density, it is difficult to ensure the safety of the battery. In the over-charge state, the battery temperature rises after the energy will be excess, so the electrolyte decomposition and gas, due to internal pressure rise and spontaneous combustion or rupture; the other hand, in the over-discharge state, the electrolyte due to decomposition led to battery characteristics and The durability is deteriorated, thereby reducing the number of chargeable times.
16. Working temperature range of lithium ion battery?
Charging: 0- + 400C (recommended)
Discharge: 0- + 400C (recommended)
Storage temperature: 25 ± 5 ℃ (recommended)
17. lithium battery protection circuit:
Lithium-ion battery protection circuit is to ensure that such over-charging and discharge state of the security, and to prevent deterioration of the characteristics. Lithium-ion battery protection circuit is composed of a protection IC and two power MOSFETs, in which the protection IC monitors the battery voltage, when there is overcharging and discharge state to switch to the external power MOSFET to protect the battery, protect the IC function is excessive Charge protection, overdischarge protection and overcurrent / short circuit protection.
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