1. Classification of rechargeable batteries
Rechargeable batteries used in our electrical appliances are mainly divided into three categories: nickel-chromium (Ni-Cd), nickel-metal hydrogen (Ni-MH), and lithium Li batteries -Ion (lithium polymer batteries are an advanced version of lithium-ion batteries). The difference between these three types is the difference in the structure and reaction of the internal chemicals. I don't know the details...but that won't affect our judgment below.
2. Some battery parameters
Capacity: This is the capacity indicated on the battery. Take 81 BP-6MT as an example, the capacity is 1050mah, which is the amount of power. the battery can provide. , but making a battery is not about measuring clothes. Typically it won't be this value, but around it it will be more, and if you're unlucky it will be less.
C voltageoupure: This is the voltage when the battery is exhausted. When it reaches this level, the phone will turn off. If you turn it back on and force discharge, the battery will die. be damaged...
Energy density: how much energy an electrolyte can hold per unit of mass or volume, which also explains why lithium batteries are much more expensive than others, because the energy density of lithium Batteries is more than twice that of the other two types.
Current C: battery capacity Removing the current h is the current c, and the current c of the BP-6mt is 1050 mA
3.
1. Does lithium battery have memory effect?
The memory effect is that the battery is recharged before it is exhausted, causing the electrolytic material to passivate and reduce the capacity.
It is correct to say that lithium batteries have memory effects. All batteries havea memory effect. You are correct in saying no, because the memory effect of lithium batteries is so weak compared to the other two types that you are embarrassed to call it a memory effect
2. Does the lithium battery need to be activated?
Yes, activation also serves to passivate the electrolyte. It is generally believed that activation is necessary when the battery is inactive for a long time, but the manufacturer has not already done this for you. you notice that when you bought the phone, the battery contained Do they all have electricity? Generally, the circulation period of electronic products is three months. If the lithium battery is unused during this period, there is no need to reactivate it.
(The manufacturer's information indicates that lithium batteries also need to be activated, but I have seen test reports from experts. In fact, this type of activation of lithium batterieslithium has almost no effect)
< p>Many people ask about the problem of charging engine oil for 12 hours in the first three times. I would like to say one more thing here if you are worried, you will be fine if you charge it for 12 hours. the first three times. As there is a protection IC in the original battery, it will generally not be overcharged. Be careful though, some very cheap off-brand devices may omit the protection circuit, so be careful not to overload!3. Should you completely discharge the battery and then recharge it?
Don't do it.
First of all, lithium batteries have almost no memory effect and can be charged at any time. Friends who use laptops should know that lithium batteries in laptops usually start charging when set to 90%. Alsobecause there is almost no memory effect, depending on maintaining the maximum Designed with time in mind.
Second, completely draining the battery is harmful to the battery. If the mobile phone is used normally and is turned off when the power is off, the voltage at this time is the cut-off voltage, and. you need to charge it. If you turn it on then turn it back on, or discharge it via other equipment, i.e. deep discharge, which will cause irreversible damage to the battery, then avoid it!
4. Lithium Battery Life
Lithium battery life is supposed to be calculated based on the total rechargeable capacity, which is how much energy your battery has been loaded. total during his life.
But batteries will age and the changes will not be linear.
Our common standard is therefore to define the lifespan of lithium batteriesm per life, which is
At room temperature (25 degrees), charge with a constant voltage of 1C and a charging current of 2 and a half hours, the current 1c is discharged until the cut-off voltage. This process is one cycle if the discharge time is less than 36 minutes it will be cut off, declaring end of life. . The official requirement is 300+ cycles, but the original Nokia battery can go up to 500. I don't know about other brands...
A few things to note are: < /p>< p >a. A cycle refers to a complete charge and discharge. If you plug it in and charge it once, it won't be counted as one cycle.
b. Even if it reaches the official end of life, your battery should still have 60% capacity (I don't know about other brands...), and you can continue to be satisfied with it. In this case, if it is an original Nokia battery, even if you charge it once a day, it may be damaged.Used normally for one year. After that, the capacity will decrease by 40% and it can still be used.
Another point that needs to be clarified is that lithium batteries are different from the other two types of batteries. They have aging characteristics, and this aging is not like the memory effect that can be fully charged and discharged to be repaired, but. is irreversible. Yes, I don't know the specific data of aging, but it is certain that too high and too low temperatures will make aging worse, especially if the temperature is too low, those friends from the Northeast who live in temperatures below 0 .degrees should be easy.
5. Lithium polymer battery and lithium battery
Organic oil explains why the battery is a lithium polymer battery and not a lithium ion battery. In fact, a lithium polymer battery is equal to itis lying. a lithium-ion battery. Lithium batteries are known as little bombs due to their high energy density. Regular lithium-ion batteries are liquid inside and have a metal outer shell, so they are less safe. Lithium polymer batteries have improved these defects, so lithium polymer batteries are batteries. better than ordinary lithium-ion batteries.
I'm only thinking about these questions at the moment. This is what I learned from professional battery engineers when I was in college. There may be errors in some places due to the passage of time, but general advice. on how to use them, the thoughts are unmistakable.
Updated 2009.1.9
Due to my work, I visited a Taiwan-funded battery factory two days ago. This factory produces OEM for Nokia, Sony, SANYO, etc., and. I witnessed the core and all the prosperipheral manufacturing and testing process, face-to-face communication with professional engineers.
Stop talking about activation. I have seen that all lithium batteries go through several complete cycles at the factory. The shortest model has a review process of over 48 hours, so capacity is clearly measured. at the factory.
I have seen testing under extreme laboratory conditions, including overcharging and overdischarging. Even if a qualified product leaves the peripheral integrated circuit, it will not explode when overcharged, but will only swell. both of these situations will cause irreversible damage to the battery.
So I keep reminding everyone not to completely drain the battery before flushing.
Which one is better, Chaowei lithium battery or Chaowei lead acid battery ?
Chaowei batteries are good.
If the battery is damagedold, replace it with a reusable battery; A reusable battery is a first stage battery that is returned to the factory after it is usually damaged. two batteries in a group are damaged, the manufacturer will return the first stage battery to the factory. It is formed by removing defective batteries from the factory, adding one or two good batteries and reassembling them.
Safety Risks:
Compared with Jinchaowei ordinary moped battery (sealed lead acid battery for electric moped)
1. -Acid battery for power assist is a new type of battery developed according to industry standards.
2. This series of products has the characteristics of excellent high current discharge performance, low self-discharge, high specific energy and long service life.
Of course it's a lithium battery! ! ! The advantages arefollowing:
1. Very long lifespan. The lifespan of long-life lead-acid batteries is about 300 times, the maximum is 500 times. However, the lifespan of lithium iron. Phosphate batteries reach over 2,000 times, which is standard. After one charge (5 hour rate), they can be used up to 2,000 times. Lead-acid batteries of the same quality last “six months for new ones, six months for old ones and another six months for maintenance”, or 1 to 1.5 years at most. However, lithium iron phosphate batteries last 7 years. -8 years if used in the same conditions for life". In overall consideration, the performance-price ratio will be more than 5 times higher than that of lead acid batteries.
2. Its use is safe. The lithium iron phosphate completely solves the safety hazards of lithium cobalt oxide and lithium manganate will explode in strong collision and causeendangers the lives of consumers. poses a threat, and lithium iron phosphate batteries are characterized by the fact that they will not explode even in the worst road accidents after rigorous safety tests.
3. It can charge and discharge quickly at a high current of 2C. Under a special charger, the battery can be fully charged in 40 minutes at 1.5C, and the starting current can reach 2C. currently do not have this performance.
4. High temperature resistance, the maximum value of lithium iron phosphate electric heating can reach 350℃-500℃, while lithium manganate and lithium cobalt oxide are only about 200℃.
5. Large capacity lithium iron phosphate battery renewalThe mileage is 3-4 times that of lead-acid batteries of the same quality. Its advantages allow electric bikes to travel more than 100 kilometers on a single chargeunder the assumption of moderate weight. For office workers, a single charge can last approx. one week. The maximum battery capacity of an electric bicycle equipped with a lead-acid battery is 12 Ah as long as the weight of the vehicle does not exceed the standard (the weight of the lead-acid battery has reached 13 kg at this time, while (the weight of the same capacity lithium iron phosphate battery is only 5 kg), it can travel up to about 50 km on a single charge.
6. No memory effect. When rechargeable batteries are often fully charged and not fully discharged, the capacity quickly drops below the rated capacity. This phenomenon is called memory effect. Nickel metal hydride and nickel cadmium batteries have memory, but lithium iron phosphate batteries do not have this phenomenon. Regardless of the state the battery is in, it can be charged and used at any time, and it is notno need to unload it first. then charge it.
7. Small size and light weight. The volume of a lithium iron phosphate battery with the same specifications and capacity is 2/3 of the volume of a lead-acid battery, and the weight is 1/3. that of a lead-acid battery.
8. Green and environmentally friendly.
Although the price is high, it is still very cost-effective for long-term use·Haha