the use of high-current fast charging, it will affect battery life

How to rechargeable batteries
Rechargeable Battery

A limited number of charge rechargeable batteries with charger. The market generally sell on the 5th, the 7th, but there on the 1st. Benefits of rechargeable batteries is economic, environmental, power enough for high-power, long-term use of electrical appliances (such as Walkman, electric toys, etc.). Charging the battery voltage is lower than the same type of disposable batteries, AA batteries (the 5th charging) is 1.2 volts, 9V rechargeable battery is actually 8.4 volts. Charging times can now generally around 1000. At present, only five categories: nickel-cadmium, nickel metal hydride, lithium ion, lead accumulator, lithium iron.
Steps / methods

Timing control
When using 1.25C charge rate, the battery 1h be sufficient; When using 2.5C charge rate, 30min be sufficient. Therefore, according to the capacity of the battery and the charging current, it is easy to determine the time required for charging. This control method is the most simple, but due to the initial state of charge of the battery is not exactly the same, and some lack of battery charge, and some battery overcharge, therefore, only the charge rate is less than 0.3C, it allows the use of this method.
Voltage Control
In the voltage control method, the most likely to be detected is the highest voltage of the battery. Voltage control law is used:
The maximum voltage from the charging characteristic curve can be seen, when the battery voltage reaches the maximum value, i.e. the battery is fully charged. During charging, when the battery voltage reaches a predetermined value, should immediately stop fast charging. The disadvantage of this control method is: the highest voltage battery is fully charged with the ambient temperature, the charging rate change, and the maximum charge voltage of each cell there are differences in the battery pack, so this method can not be very accurately determine the battery has enough charge.
Negative delta voltage increment due to the negative battery voltage and the voltage of the battery pack is absolutely nothing to do, but also affected by environmental factors such as temperature and charge rate, so you can more accurately determine the battery is fully charged. The disadvantage of this control method is: the battery voltage negative increment, the battery has been charged, so the higher temperature of the battery. Also after the nickel-metal hydride battery is fully charged, the battery voltage to go through a long time before a negative increment, the overcharge is more serious. Therefore, this control method is mainly used in nickel-cadmium batteries.
Voltage zero incremental NiMH battery charger in order to avoid negative voltage increments wait for too long and damage the battery, usually 0ΔV Control Act. The disadvantage of this approach is: fully charged before the battery voltage may vary within a certain period of time is small, resulting in a premature stop rapid charging. For this reason, most nickel-metal hydride batteries are used highly sensitive detection of fast charger when the battery voltage drops slightly, immediately stop fast charging.Laptop Akku and laptop batteries news online

Temperature Control
To avoid damage to the battery, the battery temperature is too low can not start fast charging, the battery temperature rises to a predetermined value, you must immediately stop fast charging. Temperature control methods are commonly used:
The maximum temperature during charging, typically when the battery temperature reaches 45 ℃, should immediately stop fast charging. The battery temperature and the battery may be assembled together by a thermistor to detect. The disadvantage of this method is the long response time of the thermistor, the temperature detection with a certain lag, while the maximum operating temperature of the battery and the ambient temperature. When the ambient temperature is too low, after fully charged, the battery temperature does not reach 45 ℃.HSTNN-IB34
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In order to eliminate the environmental impact of temperature, temperature control method can be used. When the battery's temperature reaches a predetermined value, immediately stop fast charging. In order to achieve temperature control, the thermistor must be two, respectively, to detect the battery temperature and the ambient temperature.
Temperature change rate of nickel metal hydride and nickel-cadmium battery is fully charged, the battery temperature is rising rapidly, and the rate of rise ΔT / Δt basically the same, when the battery temperature rises 1 ℃ per minute, shall immediately terminate fast charging, this charging control method, in recent years, come to be widely used. It should be noted, due to the temperature dependence of the resistance of the thermistor is not linear, and therefore, in order to improve the detection accuracy of the thermistor should try to reduce the impact of nonlinearity.
The lowest temperature when the battery temperature is below 10 ℃, the use of high-current fast charging, it will affect battery life. In this case, the charger should automatically transferred to trickle charge until the battery temperature rises to 10 ℃, and then transferred to fast charging.
Integrated control
These various control methods have advantages and disadvantages. In order to ensure that in any case, be able to accurately control the battery charging * state, the current fast charger usually include timing control, voltage control and temperature control integrated control method.





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