Why can't the negative pole of the rescued car be connected? This is about avoiding accidents. Most drivers have encountered it when the battery is low and requires emergency help. Many people can drive the car simply by connecting the positive pole to the positive pole and the negative pole to the negative pole of the two batteries. There is no problem. , but in fact, the correct operation is indeed yes, one end of the negative electrode is connected to the negative electrode of the emergency vehicle battery, and the other end is connected to the ground point of the vehicle body rescued, which is ground iron.
The negative live wire cannot be directly connected to the negative battery terminal of the rescued vehicle, but must be connected to an exposed metal position on the body that is not painted. Why is this stipulated? Since the instantaneous current at the start of thestarter can be described as huge, the contact area between the live wire and the battery cell head is small, and the large instantaneous current can easily cause ignition and sparking, and flammable gas will rush into the battery . , which is prone to accidents. There is no other connector for the positive electrode of the battery, it can only be connected to the battery, and the negative pole of the car battery is connected to the car body, and the entire bodywork is negative. , so try to keep the connection point of the negative pole away from the battery to reduce the risk as much as possible.
Another point to add is that I read many answers and they all mentioned that directly connecting the negative pole is equivalent to providing starting current to the rescued vehicle and charging the battery at the same time , which causes too much current. Heavy. Personally, I thinke that this is not the correct answer, because the negative electrode of the battery and the car body are already connected. The only difference. is the security issue mentioned above. Connect the negative pole of the rescued vehicle. Drive for a long time and use the car to generate electricity to recharge the battery.
Under normal circumstances, the emergency vehicle takes the line to start the car. There are two methods depending on the situation:
< p> 1: Be The battery of the emergency vehicle is only slightly short of power, that is, she finds herself in a situation where she cannot start the fire. At this time, the emergency vehicle wiring can be connected in any way. !
2: The battery of the rescued vehicle was seriously insufficient, with very low power, low voltage and high internal resistance. Once the wiring is connected, this equalsIt corresponds to two car batteries connected in parallel. From the principles of physics, we know that energy will always flow from high voltage to low voltage. Then, at that time, some backup power. the vehicle will be powered by the battery. If the discharge is carried out at this time, the current of the emergency vehicle may be insufficient. In addition, because the internal resistance of the recovered battery is too high, the instantaneous current at start-up is very large, which can damage the battery.
Correct wiring method:
1. Turn on the power of the whole vehicle and turn off the fan. air conditioning (if it is not turned off after the first turn off, it will be on by default)
2. Once the positive and negative poles of the emergency vehicle connected, disconnect the negative pole of the rescued vehicle and the positive pole of the vehicle batteryrescued him if necessary. Connect the positive pole of the rescue vehicle and the negative pole of the rescue vehicle to the ground point of the rescued vehicle. The reason why the negative electrode of the rescued vehicle must be removed is to prevent the rescue vehicle from charging the rescued vehicle's battery, which may result in insufficient battery.
3. The rescue vehicle increases the speed of the accelerator and the rescued vehicle begins to burst into flames. . .
4. Start-up time should not exceed 8 seconds. Wait 10 seconds before restarting.
5. Connect the negative pole of the rescued vehicle. Drive for a long time and use the car to generate electricity to recharge the battery.
Battery maintenance suggestions: It is recommended to remove the battery in time and use a special charger to charge it to avoid battery damage. 'exhausted for ae long period and does not cause premature disposal. drums.
What you are probably talking about is that the negative terminal of the rescue vehicle battery cannot be directly connected to the negative terminal of the rescued vehicle battery. This is about avoiding accidents.
The image above is taken from the user manual. The manufacturer specifically reminds: The negative live wire cannot be directly connected to the negative battery of the rescued vehicle, but must be connected to an exposed metal position on the body. it's not painted. Why is this stipulated like this? Since the instantaneous current when starting the starter can be described as huge, the contact area between the live wire and the battery cell head is small, and the large instantaneous current can easily cause ignition and sparking, and flammable gas will rush into the battery. , which is subjectt to accidents. There is no other connector for the positive electrode of the battery, it can only be connected to the battery, and the negative pole of the car battery is connected to the car body, and the entire bodywork is negative. , so try to keep the connection point of the negative pole away from the battery to reduce the risk as much as possible.
But in real life, people directly connect the positive and negative poles to make fire, and there is no problem. For what ? These are mainly legal liability issues. Batteries produce flammable gases due to electrolysis in certain circumstances, so manufacturers must take this issue into consideration. As long as they are reminded, the manufacturer will not be held responsible if something goes wrong. Therefore, there is always a lot of “alarmist” content in the instructions.
There is also a sayingn according to which the negative line of the rescued vehicle must be disconnected to prevent the rescue vehicle battery from charging the rescued vehicle battery. In fact, this worry is unnecessary. The voltage difference is relatively small. when the load current is just connected, it will not be too large, and once connected, the motor will start and the generator will have enough power supply. Random disassembly of the car's original power line may affect the operation of electronic equipment. Many car sunroofs need to be initialized before they can be used normally after a power outage. So there is no need to move lines for unnecessary reasons.
How to light a fire? The currently recognized correct approach is as follows:
1. First connect the positive terminal of the rescued vehicle battery.
2. Then connect the positive terminal of the emergency vehicle battery.
3. Connect the negative terminal of the emergency vehicle battery.
4. Connect the rescued vehicle to the rail.
5. Start the engine of the emergency vehicle and lightly press the accelerator to increase the output current of the generator.
6. The rescued vehicle begins to catch fire.
7. After successful ignition, remove the ground wires in reverse order: the ground wire of the rescue vehicle, the negative pole of the rescue vehicle and the negative pole. of the rescue vehicle.The positive pole of the rescue vehicle is the positive pole of the rescued vehicle.
Let me talk about my understanding of this problem, common sense and conventional electrical rescue methods.
There are approximately two types of battery discharge. One is that it is completely discharged and hasAnother thing is that the battery is not enough to start. the car cannot start. But electrification rescue methods are different. You may not be able to reach someone even if you try to electrify them. This is the subject of the question and answer session, the question of why the negative pole of the rescued car cannot be connected.
Anyone who has studied basic physics knows that there are series and parallel connection methods for electricity. The results produced by the two connection methods are also different. The rated working voltage of electrical appliances in the car is 12V. , so what we do In electrical rescue, the two batteries are connected in parallel, that is, the positive pole is connected to the pole positive and the negative pole is connected to the negative pole. There is also a wiring sequence, positive first, then negativetif. When closing the wire, the negative pole first, then the positive pole. Remember! This is a basic method of connecting electricity. If you are not sure, you can search it on Baidu at any time. Don't log in randomly.
The car battery can store electricity. Part of the electricity generated by the generator is stored by the battery and used for starting, etc. when some generators do not produce electricity. . In other words, the battery is like a big water storage bucket. It can collect and store electricity and also discharge it. Suppose the rescue vehicle is A and the rescued vehicle is B. When the batteries of the rescued vehicle are completely discharged, if the batteries of A and B are completely combined, then part of the electricity of the vehicle's battery rescue A will flow to If the battery of rescued vehicle B isstored, the rescued vehicle B will still not be able to be powered on and will catch fire. If we do not combine the batteries of vehicles A and B and disconnect the battery of emergency vehicle B, it is equivalent to using the battery of emergency vehicle A to directly start the rescued vehicle. Therefore, when we start, the motor does not even have basic rotation, we have to disconnect the negative pole of the tram along the way when powering on, and put it directly on the metal of the motor.
Another situation is that when the vehicle battery power is not very sufficient, the engine can run the engine, but it cannot reach the speed starting. This shows that the battery can still be discharged, but the discharge capacity is not sufficient. At this point, if we use the emergency vehicle to connect the batteries, we can connect the batteries of thetwo vehicles together when starting. will be discharged at the same time, which is enough to meet the power needed for starting.
There is no such thing, but some cars do not have a dedicated negative terminal on the battery. For example, an Audi car catches fire