Six strokes teach you to protect the life of new energy car batteries

Nowadays, more and more new energy vehicles are appearing in the public eye. Domestic consumers are gradually shifting their focus from the initial strangeness to the actual use of new energy vehicles. The government has also adopted a strong support attitude towards new energy vehicles. It has not only opened up a large number of preferential policies, but also opened a policy of buying new energy vehicles without the need to shake the number in the traditional fuel car lottery. Limited line control, which also makes Beijing's new energy vehicle indicators ranked in the second half.

However, at present, new energy vehicles can be counted as new industries in the domestic market. The owner's understanding of the maintenance of automobiles is still not thorough, so it affects the service life of new energy vehicle batteries. Xiaobian today will introduce how to carry out new energy vehicles. Effective maintenance can maximize battery life.

First of all, we must establish a basic concept: the maintenance of traditional fuel vehicles is more around the engine, the need to regularly change the oil, machine filter and spark plugs; and electric vehicles are mainly for the battery and motor for daily maintenance.

1. Please take a light step

If the new energy vehicle slams on the acceleration at the start, it will cause the battery to discharge at a high current. The high current discharge will easily produce lead crystallization, which will damage the physical properties of the battery plate and affect the service life. Therefore, remind the majority of car owners here, do not worry about starting.

2. Prevent exposure and cold

If the new energy vehicle is exposed to the sun for a long time, the temperature will be too high, which will increase the internal pressure of the battery and cause the battery to lose water, causing the battery activity to decrease and accelerate the aging of the plate. If it is stopped in a cold environment for a long time, it will The impact on the endurance of the battery has a sharp decline, and will have a negative impact on battery performance. Many car owners in the northern region have reported that new energy vehicles are not willing to turn on air conditioners during the winter, or they are worried that their endurance will be even worse.

3. Charging time is not as long as possible

New energy vehicles should not overcharge, over discharge and undercharge, which will shorten battery life. During the use process, the charging time and frequency should be determined according to the actual vehicle condition. If the battery indicator light is on, it should be charged as soon as possible. Otherwise, the battery will be over-discharged, which will affect the service life. And the charging time should not be too long, otherwise it will form overcharge and make the battery heat. If the battery temperature exceeds 65 °C during the charging process, the charging should be stopped immediately to avoid danger.

4. Develop good habits for regular inspections

Whether it is a drive-driven car or a new-energy car, regular inspections of the car are an essential part. If the mileage of the new energy vehicle suddenly drops sharply during the use, it is very likely that there is at least one battery in the battery pack. At this time, it should be rushed to the repair shop for timely treatment.

5. Parking vehicles for a long time should also be charged

Some car owners believe that if the vehicle is not used for a long time, it is not worried that the new energy vehicle will be parked in a deficient state. It is only necessary to charge the car before the next use. This is a big mistake. When the battery is stored in a depleted state, it is prone to sulfation, and the lead sulfate crystals adhere to the plate, which is extremely harmful to the battery. Therefore, the car with the above habits is mainly changed in time.

6. Tire pressure and battery are inseparable

This principle is the same as that of a conventional drive car. Incorrect tire pressure can cause a lot of power consumption, short mileage, and also reduce the life of the tire, and also poses a certain threat to driving safety.

Don't underestimate the maintenance of new energy car batteries. The battery is the most critical "heart" part for new energy vehicles. At this time, some friends have to ask questions. Even if daily care is taken, how long will the battery life last? ? The reporter specifically asked the internal staff of BAIC New Energy. According to the staff, if the daily maintenance is proper, the battery will perform effectively for about 6 years. Of course, the battery life mentioned here means that the battery charging capacity has dropped to 70%, not 100%. Therefore, the majority of car owners for the six years of peace of mind, daily maintenance work is essential.

Characteristic Impedance PCB

How do you do impedance matching in PCB?

In high-speed PCB design, impedance matching must be considered in order to prevent reflections. However, because the PCB processing technology limits the impedance continuity and simulation cannot be simulated, how to consider this issue in the design of the schematic? In addition, regarding the IBIS model, I wonder where a more accurate IBIS model library can be provided. Most of the libraries we downloaded from the Internet are not very accurate, which greatly affects the reference of the simulation.

When designing high-speed PCB circuits, impedance matching is one of the design elements. The impedance value has an absolute relationship with the wiring method, such as walking on the surface layer (microstrip) or inner layer (stripline/double stripline), distance from the reference layer (power layer or ground layer), wiring width, PCB material, etc. Both will affect the characteristic impedance value of the trace. That is to say, the impedance value can only be determined after wiring. Generally, simulation software cannot take into account some wiring conditions with discontinuous impedance due to the limitation of the circuit model or the mathematical algorithm used. At this time, only some terminators (termination), such as series resistance, can be reserved on the schematic diagram. Alleviate the effect of discontinuity in trace impedance. The real solution to the problem is to try to avoid impedance discontinuities when wiring. The accuracy of the IBIS model directly affects the simulation results. Basically, IBIS can be regarded as the electrical characteristics data of the equivalent circuit of the actual chip I/O buffer, which can generally be obtained by conversion of the SPICE model (measurement can also be used, but there are more restrictions), and the SPICE data and chip manufacturing have absolute Therefore, the SPICE data of the same device provided by different chip manufacturers is different, and the data in the converted IBIS model will also vary accordingly. In other words, if manufacturers A`s devices are used, only they have the ability to provide accurate model data for their devices, because no one else knows better than them what process their devices are made of. If the IBIS provided by the manufacturer is inaccurate, the fundamental solution can only be to continuously ask the manufacturer to improve.
In high-speed PCB design, the software we use is only to check the EMC and EMI rules that have been set, but from which aspects should the designer consider the EMC and EMI rules? How to set up rules?
Generally, EMI/EMC design needs to consider both radiated and conducted aspects. The former belongs to the higher frequency part (<30MHz) and the latter is the lower frequency part (<30MHz). So you can't just pay attention to the high frequency and ignore the low frequency part. A good EMI/EMC design must consider the location of the device at the beginning of the layout. The arrangement of the PCB stack, the important connection method, the selection of the device, etc. If there is no better arrangement beforehand, it will be half the effort and increase the cost if it is resolved afterwards. For example, the location of the clock generator should not be as close as possible to the external connector. High-speed signals should go to the inner layer as much as possible. Pay attention to the characteristic impedance matching and the continuity of the reference layer to reduce the slew rate of the signal pushed by the reflective device. When choosing a decoupling/bypass capacitor, pay attention to whether its frequency response meets the requirements to reduce noise on the power plane. In addition, pay attention to the return path of the high-frequency signal current to make the loop area as small as possible (that is, the loop impedance as small as possible) to reduce radiation. The ground can also be divided to control the range of high-frequency noise. Finally, properly select the grounding point between the PCB and the case.

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