Electric vehicle charging technology
New energy vehicles are becoming the travel choice of more and more people, and the difficulty of charging is also the common aspiration of some new energy owners. In order to help people charge more effectively and conveniently, relevant favorable policies of the State Grid have successively provided help.
The construction of electric vehicle charging pile is one of the key livelihood facts. As one of the new infrastructure projects, the charging infrastructure has been continuously constructed in recent years to provide citizens with new energy electric vehicle charging places. However, as the kinetic energy driven by electricity, new energy and electric vehicles should pay special attention to the safety of electricity while charging the vehicle, so as to ensure correct operation and avoid unnecessary damage.
About the charging function of the on-board power battery system: during the driving process of the electric vehicle, the electric energy is continuously consumed. When the SOC of the power battery is lower than a certain value, it is necessary to supplement the electric energy of the power battery. Therefore, charging the power battery has become an essential link in the use of the electric vehicle. Battery charging usually completes three functions:
1, restore the battery to the rated capacity as soon as possible, that is, on the premise of restoring the battery capacity, the shorter the charging time, the better.
2,Eliminate the adverse consequences caused by battery discharge during use, that is, repair the battery performance damage caused by deep discharge and aging.
3,Replenish the battery to overcome the adverse effects caused by battery self discharge.
To sum up, the basic performance parameters of the battery must be considered for the charging of the power battery used in pure electric vehicles, including the self discharge rate of the battery, the service life of charge discharge cycle and the state of charge.
Self discharge rate of battery: the self discharge rate of power battery refers to the attenuation rate of stored electricity of power battery due to physical micro short circuit and chemical reaction during storage or standing, that is, the rate of capacity loss caused by self discharge when the power battery is unloaded. The self discharge rate is expressed by the percentage of capacity decrease per unit time. For example, when Tesla Model 3 is not running, the battery will discharge very slowly, with a discharge rate of about 1% per day. After two weeks (14 days), the battery will discharge about 14%. Do not let the battery discharge completely. To prevent complete discharge, the vehicle will enter low power consumption mode when the displayed power level drops to about 0%. In this mode, the battery stops supporting the on-board electronic device and the auxiliary 12V battery. After this low power consumption mode is enabled, plug in the charging power plug immediately to avoid jumper jump starting and replacing 12V battery.
State of Health (soh): the power battery gradually ages and the capacity decreases with the increase of the number of charge / discharge cycles. Cycle life is the number of times that the power battery is used when it decays to the lowest available capacity. The life of the power battery is divided into cycle life and calendar life. The cycle life is generally expressed in "times", which represents the times that the power battery can be charged / discharged.
The cycle life of power battery is usually the deep charge / discharge (full charge, full discharge or 80% charge / discharge) at the rated charge / discharge current under ideal / humidity, and the number of cycles experienced when the capacity decays to 80% of the rated capacity is calculated.
Calendar life is the time from production date to expiration date, with year as the unit of measurement. This period includes different test links such as shelving, aging, high and low temperature, cycle, working condition simulation and so on.
State of charge (SOC): the state of charge is a parameter used to represent the remaining power in the battery. This parameter is related to the charging / discharging history and charging / discharging current of the battery. The state of charge is generally expressed as a percentage, with a value of - 100%. For batteries filled with rated current, SOC = 100%.
The selection of SOC application scope of power battery system shall first consider the requirements of the whole vehicle for charging / discharging power and available energy, and shall be determined in combination with factors such as charging / discharging capacity (power and energy), storage performance (self discharge rate), service life, safety characteristics and SOC estimation accuracy of power battery management under different temperature conditions. Under the condition of low temperature and low SOC, the discharge power of power battery will be limited; Under the conditions of low temperature and high SOC, the charging / regenerative braking recovery power of the battery unit will be limited.
For more EV cable and electric vehicle charging cables, please visit OMG official website: https://www.omgevcable.com/
The construction of electric vehicle charging pile is one of the key livelihood facts. As one of the new infrastructure projects, the charging infrastructure has been continuously constructed in recent years to provide citizens with new energy electric vehicle charging places. However, as the kinetic energy driven by electricity, new energy and electric vehicles should pay special attention to the safety of electricity while charging the vehicle, so as to ensure correct operation and avoid unnecessary damage.
About the charging function of the on-board power battery system: during the driving process of the electric vehicle, the electric energy is continuously consumed. When the SOC of the power battery is lower than a certain value, it is necessary to supplement the electric energy of the power battery. Therefore, charging the power battery has become an essential link in the use of the electric vehicle. Battery charging usually completes three functions:
1, restore the battery to the rated capacity as soon as possible, that is, on the premise of restoring the battery capacity, the shorter the charging time, the better.
2,Eliminate the adverse consequences caused by battery discharge during use, that is, repair the battery performance damage caused by deep discharge and aging.
3,Replenish the battery to overcome the adverse effects caused by battery self discharge.
To sum up, the basic performance parameters of the battery must be considered for the charging of the power battery used in pure electric vehicles, including the self discharge rate of the battery, the service life of charge discharge cycle and the state of charge.
Self discharge rate of battery: the self discharge rate of power battery refers to the attenuation rate of stored electricity of power battery due to physical micro short circuit and chemical reaction during storage or standing, that is, the rate of capacity loss caused by self discharge when the power battery is unloaded. The self discharge rate is expressed by the percentage of capacity decrease per unit time. For example, when Tesla Model 3 is not running, the battery will discharge very slowly, with a discharge rate of about 1% per day. After two weeks (14 days), the battery will discharge about 14%. Do not let the battery discharge completely. To prevent complete discharge, the vehicle will enter low power consumption mode when the displayed power level drops to about 0%. In this mode, the battery stops supporting the on-board electronic device and the auxiliary 12V battery. After this low power consumption mode is enabled, plug in the charging power plug immediately to avoid jumper jump starting and replacing 12V battery.
State of Health (soh): the power battery gradually ages and the capacity decreases with the increase of the number of charge / discharge cycles. Cycle life is the number of times that the power battery is used when it decays to the lowest available capacity. The life of the power battery is divided into cycle life and calendar life. The cycle life is generally expressed in "times", which represents the times that the power battery can be charged / discharged.
The cycle life of power battery is usually the deep charge / discharge (full charge, full discharge or 80% charge / discharge) at the rated charge / discharge current under ideal / humidity, and the number of cycles experienced when the capacity decays to 80% of the rated capacity is calculated.
Calendar life is the time from production date to expiration date, with year as the unit of measurement. This period includes different test links such as shelving, aging, high and low temperature, cycle, working condition simulation and so on.
State of charge (SOC): the state of charge is a parameter used to represent the remaining power in the battery. This parameter is related to the charging / discharging history and charging / discharging current of the battery. The state of charge is generally expressed as a percentage, with a value of - 100%. For batteries filled with rated current, SOC = 100%.
The selection of SOC application scope of power battery system shall first consider the requirements of the whole vehicle for charging / discharging power and available energy, and shall be determined in combination with factors such as charging / discharging capacity (power and energy), storage performance (self discharge rate), service life, safety characteristics and SOC estimation accuracy of power battery management under different temperature conditions. Under the condition of low temperature and low SOC, the discharge power of power battery will be limited; Under the conditions of low temperature and high SOC, the charging / regenerative braking recovery power of the battery unit will be limited.
For more EV cable and electric vehicle charging cables, please visit OMG official website: https://www.omgevcable.com/
