When the electric vehicle is in use, the battery belongs to the consumable piece. It is directly related to the user's use cost. The charging and discharge cycle of the battery can reach more than 500 times, and the actual use process often discovers the life of the battery far below this charge. The number of discharge cycles is based on the main reasons for analysis:
The components of the electric vehicle battery are often connected in series by 2 (24V) or 3 (36V) cells, so that the necessary detection is required for each battery of the battery pack, and the individual characteristics of each battery are selected. The composition of the battery pack can achieve the best combination, thereby increasing the life of the entire battery pack.
Otherwise, the battery pack using the battery of the battery that exists in the absence of individual characteristics will affect the battery life. For example, one of the individual capacity is small, then this individual is first filled with electricity and enters overcharge during charging, and at the time of discharge, this individual is first delanted and enters the over-discharge state (which is equivalent to using a dry battery, new old battery mix The effect is used, so that this individual capacity is further reduced, which is fallen into a vicious circle.
Now some manufacturers have no corresponding testing equipment, and there is no necessary matching detection, so that there is a congenital deficiencies in the selected battery pack, which affects the life of the electric vehicle battery.
2, charger factor
One work cycle of the battery is the charging process of charging and discharging, so the charging process of the charging machine is also an important factor affecting the life of the battery. Directly affect the life of the battery directly on the battery of the battery. The capacity and voltage of the battery pack determines the parameters of charging, so the parameters of the charger should match the parameters of the battery, so that the chance of damage to the battery can be reduced.
In order to pursue fast charging, some chargers add charging current to (0.3-0.5) times C (C-battery capacity), and adopt some special charging control methods to achieve the purpose of reducing charging time, of course, this There are indeed a lot of chargers to achieve this, but also increases the chance of battery damage.
For example, domestic well-known brands of electric vehicles, charger use more advanced 'negative pulse to polarize the charger', but in combination with the battery pack, but cause damage to the battery, it has caused damage to the advantages of the charger. The shortcomings of the battery have severely affected the battery life of the battery.
Therefore, the charger of the reasonable charging parameter is selected to match the parameters of the battery pack, and the life of the electric vehicle battery can be extended.
3, controller factor
The discharge process in the operating cycle of the battery is also the driving process of the electric vehicle, and the controller controls various use parameters during the driving process, that is, controlling the discharge parameters of the battery, so the controller is also an important factor affecting the life of the battery. It is now that people often ignore this factor, while the problem that affects battery life is attributed to battery manufacturers and chargers, sometimes causing battery production plants and chargers.
There are two main damage factors during battery discharge:
(1) Large current discharge. The general 12ah lead-acid battery maximum discharge current is C, ie 12a, and the electric vehicle selects a colloidal battery, so the maximum discharge current is smaller. In order to improve accelerated performance, climbing capacity and load level, electric vehicle manufacturers often relax to greater than 14A (or even greater than 20a), but the damage to the battery is also real Of course, these issues are not aware of the initial use of the user, often after using a period of time before it can be reflected. Because when the user is used, each acceleration is accelerated, each climb is a damage to the battery. The way to solve this problem can only be a controller with double closed loop control.
(2) Excessive discharge. Over-discharge is also an important factor in damaging the battery, so the controller generally has an undervoltage protection circuit, but it is necessary to prevent the recovery voltage of the battery (i.e., after the battery stops discharges, the battery voltage will rise 2-3V), and the voltage should be selected The undervoltage protection circuit controlled by the hysteresis is ensured that the battery will not be discharged.
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