How to repair aluminum battery for electric vehicles

Lithium battery is widely used in various industries, now lithium battery has become the mainstream. A large number of applications in mobile electronic products and small household appliances, they can be said to be the largest application group. Lithium battery is more and more used in the simple electric bicycle, nowadays, the electric car because of its lightweight pollution-free advantages and favored by consumers, and the length of driving range is one of the main standards for consumers to measure the quality of electric cars. It is worth mentioning that in many electric vehicle quality complaints, battery problems account for more than 95%, because the battery is an important factor in determining the length of the driving range of electric vehicle. So what problems should be paid attention to in the regular maintenance of electric vehicle batteries?

Electric vehicle lithium battery special rechargeable battery

1. It is strictly forbidden to lose electricity when storing: Lithium batteries are strictly prohibited from being in a state of loss during storage. The state of deficient power means that the battery is not charged in time after use. When the battery is stored in a deficient state, it is prone to sulphation. The lead sulfate crystals adhere to the plate and block the ion channel, resulting in insufficient charging and a decrease in battery capacity. The longer the idle state is idle, the more severe the battery is damaged. Therefore, when the battery is not in use, it should be replenished once a month, so as to maintain the battery health.

2. Regular inspection: During the use, if the mileage of the electric vehicle suddenly drops by more than ten kilometers in a short time, it is very likely that at least one battery in the battery pack has a broken grid, the plate is softened, and the active material of the plate falls off. Wait for a short circuit. At this time, you should go to the professional battery repair organization for inspection, repair or matching. This can extend the life of the battery pack relatively and maximize the cost savings.

3. Avoid large current discharge: When starting, manning, or uphill, please use the ankle to assist, try to avoid instantaneous high current discharge. Large current discharges tend to cause the formation of lead sulfate crystals, which impair the physical properties of the battery plates.

4. Correctly master the charging time: During the use, you should accurately grasp the charging time according to the actual situation, refer to the usual use frequency and mileage, and also pay attention to the capacity specification provided by the battery manufacturer, as well as the performance of the supporting charger and the charging current. Wait for the parameters to grasp the charging frequency. In general, the battery is charged at night, and the average charging time is about 8 hours. If it is a shallow discharge (the mileage after charging is very short), the battery will soon be full. If it continues to charge, it will overcharge, causing the battery to lose water and heat, reducing battery life. Therefore, when the battery is discharged at a depth of 60%-70%, the charge is optimal. In actual use, it can be converted into a riding mileage. According to the actual situation, necessary charging is required to avoid harmful charging.

Prevent exposure: Do not expose to sunlight. If the temperature is too high, the internal pressure of the battery will increase and the battery pressure limiting valve will be forced to open automatically. The direct consequence is to increase the water loss of the battery, and the excessive water loss of the battery will inevitably lead to a decrease in battery activity, accelerate the softening of the plate, and charge the case. Body heat, the shell caused by fatal damage such as drums and deformation. 6

Avoid plugging when charging: The charger output plug is loose. The contact surface is oxidized, etc., which will cause the charging plug to heat up. If the heating time is too long, the charging plug will be short-circuited, which will directly damage the charger and cause unnecessary loss. Therefore, when the above situation is found, the oxide should be removed or the connector replaced.

Precautions

Prevent battery exposure

Battery maintenance knowledge:

1 A common phenomenon on memory-effect nickel-metal hydride rechargeable batteries. The specific performance is: If you start using the battery when you are not fully charged for a long time, the battery's power will drop significantly, even if you want to be full in the future. Therefore, an important way to maintain NiMH batteries is that the electricity must be used up before it can start charging. If it is fully charged, it is allowed to be put into use. The memory effect of commonly used lithium batteries can be negligible.

2. Fully charged, fully discharged for lithium batteries.

Complete discharge refers to the process of adjusting the power consumption smart device, such as a mobile phone, to the lowest power state until the mobile phone automatically shuts down.

Fully charging refers to the process of fully discharging a powered smart device, such as a mobile phone, to the charger until the phone says “full”.

3. Over-discharge for lithium batteries.

A small amount of electricity is left inside the lithium battery after complete discharge, but this part of the power is critical to the activity and life of the lithium battery.

Over-discharge: After full discharge, if you continue to use other methods, such as: forcibly turning on the mobile phone again, the battery is connected to the small light bulb to consume residual power, this is called over-discharge,

It can cause irreversible damage to the lithium battery.

4. Protection chip

Lithium batteries have extremely strict requirements on the current and voltage of the battery when charging and discharging. In order to protect the battery from damage due to abnormal external electrical environment, a chip for managing the battery state is set inside the battery body. This chip also has the function of recording battery capacity and correcting battery capacity. Now, even if it is a cottage mobile phone battery, it will not save this key protection chip, otherwise the cottage mobile phone battery cannot be used for a long time.

5. Overshoot and over discharge protection circuit

Fully manage the battery chip and circuit built into the electric smart device.

For example, on a mobile phone, there is such a circuit, and the functions are as follows:

6. When electricity is supplied, the most suitable voltage and current is supplied to the battery. Stop charging at the right time.

7. When charging, always check the residual battery power, and at the right time, order the phone to shut down to prevent over-discharge.

8. When booting up, check if the battery has been completely discharged. If it has been completely discharged, prompt the user to charge and then turn it off.

9. Avoid battery or charging line power abnormality, disconnect the circuit when abnormality is found, protect the phone.

10:Over-charged is for lithium batteries.

Under normal circumstances, when the lithium battery is charged to a certain voltage (that is, full), the charging current is cut off by the upper circuit, but the voltage and current parameters of the over-current protection circuit of some devices are different (such as mobile phone battery charger). This has caused the phenomenon that it is already full but has not stopped charging.

Overcharging can also cause battery performance damage.

11. Activation

If the lithium battery is not used for a long time (more than three months), the electrode material will be passivated and the battery performance will be degraded. It can be purified by three full charge and complete discharge to achieve the highest performance of the battery. Second, common mistakes:

The first use must be fully discharged then fully charged, three times in order to activate the battery. Otherwise the battery will never work! Answer: If you are free to do nothing, you can do this, but it is not necessary, because the activation operation does not have to be done on the first use. As long as it is used continuously, the electrode passivation can be slowly disappeared without deliberate activation.

Do not use the mobile phone when charging, it is harmful to the battery, and it will also cause excessive radiation damage to the human body.

Answer: Whether the use of the phone during charging is harmful to the battery depends on the situation (described later in this article), but one thing is certain: using the phone during charging will definitely not produce more radiation than usual.

Lithium batteries can only be charged and discharged XXX times in the life cycle, so use automatic shutdown every time you use them, and charge them to full power every time you charge.

The first clause is correct and the latter is wrong.

Each of these times refers to a complete one, such as charging from 20% to 30%, which is only 1/10 times, from 80% to 60%, only 1/5 times.

The first three charges must be 12 hours. Otherwise it will affect the battery performance.

If it is to activate the battery, it only needs to be fully charged. The general mobile phone will be fully charged within 5 hours. If the charger continues after the completion, the overshoot protection circuit will cut off the charging current of the mobile phone. After that, the battery is in a non-state, and the effect of discharging the charging line immediately after it is full is the same.

The first three charges must be 12 hours for the nickel-metal hydride rechargeable battery. The result is habitually and ignorantly written by many manufacturers in the lithium battery user manual. No culture is terrible. International companies such as Dell, Lenovo, Asus, and Apple's products will never have the words "12 hours." Moreover, for lithium batteries, this is a commonality and part of the principle. It is impossible for some manufacturers to produce 12 hours, and some manufacturers do not.

It should be noted that if the charger is used, since most of the chargers do not reach the maximum current of the official line charge, the charging time may exceed 6 hours, but as long as the battery is fully charged, the charger will automatically power off and use the line. The charge is the same.

When fully charged, it is best to remove the charging cable immediately to prevent overcharging.

Overshoot and over discharge protection circuit is not vegetarian, OK! If overcharge occurs, most of it is due to over-punching and over-discharge protection circuit damage, but in terms of current electronic product process and pressure resistance, this probability is really low, no need to worry.

Once the mobile phone prompts the user to charge, it must be charged immediately, or shut down immediately to avoid over-discharge.

Overshoot and over discharge protection circuit is not vegetarian, OK! This circuit will force a shutdown when necessary (that is, before over-discharge) without damaging the battery. The prompt of the mobile phone is to let the user know in advance to deal with or prepare in advance.

It should be noted that if the mobile phone has been automatically shut down, it must not be forced to boot for a call, because it is likely to cause over-discharge, and due to the existence of protection, most of the over-discharge protection circuit will be over before the boot is completed. Forcibly power off. Third, use correctly

New factory battery: no need for any processing, such as activation, can be put into normal use.

A battery that has been left unused for a short period of time (within three months): no processing is required (such as activation), and it can be put into normal use.

Set the battery for a long time (more than three months): It can be activated to make the battery activity the highest or not, so that it will naturally return to the highest activity with normal use.

In order to ensure the correct statistics of battery life, it is necessary for the evaluation personnel of the sub-products to perform activation before the test.

Lithium battery normal charging method:

Charge at any time and stop charging at any time, don't worry about it. This is an important advantage of lithium batteries - no memory effect, please face up to this advantage, and let your lithium battery to show its important advantages. Fourth, the lithium battery is most afraid of what

High temperature above 100 °C

It can seriously affect battery life and power storage capacity, and may cause the battery to melt or explode. Therefore, please keep the lithium battery away from fire and other heat sources. 2

5 ° C to 100 ° C high temperature

Yes, you are not mistaken, starting from 35 ° C (body temperature is generally 36.2 ° C -37.2 ° C) battery life begins to be significantly affected by temperature, the higher the temperature, the greater the impact.

The design life of a lithium battery is at least 400 times full charge and discharge. According to the average charge of the mobile phone every three days, a battery should be used for at least three and a half years. But most of the batteries have not been able to live for so long. A large part of the reason is because the battery is affected by human body temperature, and partly because of the heat generated by other chips on the phone.

Why does the battery of the laptop always feel that there is no durability of the mobile phone? That is because: First, the notebook computer heats more than the mobile phone, and the heat of the computer chip is easily transmitted to the battery, which is lighter than 40°C. Second, for faster charging, the notebook charging current is generally higher, the battery capacity is large, and the charging and discharging battery will also be hot. Third, the battery is generally located at the lower panel, which is less likely to dissipate heat.

Then, if your device is in use, it will generate more heat, such as a long phone call, a large game on a mobile phone, a game on a laptop, and this heat will be transmitted to the battery, plus the heat of the battery itself during charging. Although it does not pose a security risk, it will also affect the battery.

So if you find that the device in charge is very hot (such as playing the 3D game while the iphone is charging), you can consider waiting for the full charge, then connect to the charging cable. 3

-40 ° C below the low temperature

Will reach the freezing point and completely freeze. 4

10 ° C to -40 ° C low temperature

Will reduce the battery life, but will not cause permanent damage to the battery, as long as the temperature returns to room temperature, the power will automatically recover back. What is the most afraid of lithium batteries in idle?

High temperature above 35 °C, same as medium lithium battery

After being fully charged, the battery ages faster than usual

After the discharge is idle, the battery will self-discharge during the idle process, and the battery will self-discharge after full discharge.

Below -40 ° C low temperature will reach the freezing point and completely freeze.

Lithium battery ideal state:

The lithium battery ambient temperature is suitable at around 20 ° C (almost the indoor temperature), and the battery discharge charging performance can be maximized.

If you want to idle the battery for a long time (more than three months), please be sure to charge it to about 40% and then idle (for a short time, the key is trouble). Because of this, when the battery is shipped, the battery factory is basically charged to 40% and then shipped.

The lower the temperature of the idle battery, the slower is the aging, but not below -40 °C.

The page contains the contents of the machine translation.