button battery 2032

What role does the charger play in button battery 2032?

During the use of electric vehicles, batteries are consumable parts, which are directly related to the user's usage fees. The normal charge and discharge cycle of the battery can reach more than 500 times, but in actual use, it is often found that the life of the battery is far less than this number of charge and discharge cycles. According to analysis, the main reasons are as follows:

1. Congenital deficiency The battery of an electric vehicle is often composed of 2 (24V) or 3 (36V) battery individuals connected in series to form a battery pack. In this way, each battery individual that constitutes the battery pack needs to be tested. Only when each battery individual has the same characteristics can the battery pack be selected to achieve the best combination effect, thereby increasing the life of the entire battery pack. Otherwise, using battery individuals with different individual characteristics to form a battery pack will affect the battery life.

For example, if the capacity of one individual is small, this individual will be fully charged first and enter the overcharge state during charging, and this individual will be discharged first and enter the overdischarge state during discharging (equivalent to the effect of using new and old batteries mixed when using dry batteries), thereby further reducing the capacity of this individual and falling into a vicious circle. At present, some manufacturers do not have the corresponding testing equipment and do not conduct the necessary matching tests, which makes the selected battery packs have inherent deficiencies and affects the life of electric vehicle batteries.

2. Charger factors A working cycle of the battery is the charging and discharging process of the charger, so the charging process of the charger is also an important factor affecting the life of the battery. The charging current size of the battery and the charging control method directly affect the life of the battery.

The capacity and voltage of the battery pack determine the charging parameters, so the parameters of the charger should match the parameters of the battery, so as to reduce the chance of damage to the battery due to improper charging. At present, in order to pursue fast charging, some chargers increase the charging current to (0.3-0.5) times C (C-battery capacity value) and adopt some special charging control methods to achieve the purpose of reducing the charging time. Of course, many of these chargers have achieved this goal, but it also increases the chance of battery damage.

For example, a well-known domestic brand of electric vehicles uses a more advanced "negative pulse depolarization charger" as the charger, but the improper combination with the battery pack has caused damage to the battery. The advantages of the charger have caused disadvantages that damage the battery, seriously affecting the service life of the battery. Therefore, choosing a charger with reasonable charging parameters to match the parameters of the battery pack can extend the life of the electric vehicle battery.

3. Controller factors The discharge process in the working cycle of the battery is also the driving process of the electric vehicle. During the driving process, the controller controls various usage parameters, that is, controls the discharge parameters of the battery. Therefore, the controller is also an important factor affecting the battery life.

It is puzzling that people now often ignore this factor and blame the battery manufacturer and charger for the problems that affect the battery life, which sometimes makes the battery manufacturer and charger suffer unjust accusations.

There are two main damage factors in the battery discharge process:

(1) High current discharge. The maximum discharge current of a general 12AH lead-acid battery is C, that is, 12A, while electric vehicles use colloidal batteries, so the maximum discharge current is smaller. In order to improve the acceleration performance, climbing ability and load level, the current electric vehicle manufacturers often relax the current limit of the controller to more than 14A (or even more than 20A). The performance is improved, but the damage to the battery is real. Of course, these problems are not noticeable in the early stage of use by users, and they are often reflected only after a period of use. Because when the user uses it, every acceleration and every climbing is a damage to the battery. The only way to solve this problem is to use a controller with double closed-loop control.

(2) Overdischarge. Overdischarge is also an important factor in damaging the battery, so the controller generally has an undervoltage protection circuit, but to prevent the use of the battery's rebound voltage (that is, after the battery stops discharging, the battery voltage will rebound by 2-3V), an undervoltage protection circuit with voltage hysteresis control should be selected to ensure that the battery will not be overdischarged.

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