Let's start by talking about how to make a lithium battery for motorcycles.
First, if you use lead-acid batteries often in the winter in the north often because the motorcycle can not start to push away, I think this time you will particularly understand the rape Jun I really want to lick the lithium battery, replace the lithium battery.
Secondly, recently, after the Spring Festival of rapeseed, the new job has not been discussed well. Therefore, we have time to engage in our own little hobby.
The third, that is, put it down! Interested in lithium battery welcome to communicate with me
The rape pedal can not be started in winter as soon as winter travels, and sometimes it is necessary to pull the cart home from time to time. The lead-acid battery of this car has been changed once a year. The Yuasa 7A battery that was changed last year is not good anymore. Sometimes it is very helpless. When it is low voltage, it is still the habitual switch start, so the motor is also damaged. This is a complete lack of lead-acid food. In desperation to buy an emergency start, go out to start under the folder, get off and get it down. But it was always troublesome, so he planned to make a 12V lithium battery with a high discharge rate directly on the car, so that he would have to get an emergency starter clip battery every time he went out.
Rape Jun's original plan is to directly convert this emergency power supply into a motorcycle battery. However, this product has a 5V charge and has to convert the voltage. In addition, the 12V terminal has no protection and is directly connected to the battery. High Current. In addition to such a small volume, the capacity is also small. It is always troublesome to change the loading directly, and there is no protection board and it is not safe. Under the trade-off, I decided to sell this product, and I made a more suitable lithium battery for myself. Lithium batteries with different voltage capacities have been no less than a dozen, and it is not difficult.
Rapeseed Jun's Digital DIY Part I: Say goodbye to the 10 yuan 1 Nanfu Green DIY DIY multimeter 9V lithium battery
Rapeseed Jun's Digital DIY Chapter Three: Manually Homemade Practical 12V Lithium Battery With It Downstairs
The following is to help users customize various types of replacement lithium batteries, various uses, all kinds of capacity of various voltage requirements.
Here you can look at the internal structure of this emergency power supply, in fact, the quality is very general, 12V output they are in order to save costs are not added circuit protection, direct access to the battery.
In this case, once the motor fails, it is very easy to cause damage to the entire circuit of the motorcycle, and if it is serious, it will burn the motorcycle power supply line.
And this type of emergency power supply, the virtual standard capacity is a common phenomenon. Some of the standard 8000mah is actually less than 4000mah under the test of netizens, and then this is still the standard of charging treasure 3.7v, and the capacity converted into 12v is divided by 3 and then 1200mah.
Therefore, many people said that the goods started to run out of power on several occasions, because their own power is less!
Well, said so much, be the reason I do this 12V motorcycle start lithium battery.
Doing lithium-ion batteries for motorcycles needs to solve the following problems. First, select the battery box, waterproof dust simulation
Lithium battery box_Taobao search Taobao search is the most intelligent commodity search engine, through the operation of big data, accurate understanding of goods and users, to provide accurate personalized search experience. Direct links to s.taobao.com First of all, according to the size of the motorcycle, find a suitable battery box, after all, the use of motorcycles do not want to be indoors, rain and rain, and lithium batteries do a good job of dust and water protection is very critical. The space is also the key to determining how much battery you can put on.
My scooter uses Yuasa's 12V7A battery. I just scouted a box of almost the same size and I plan to use this box to package my lithium battery pack.
After selecting the box, the next step is to select the battery according to the capacity requirements and discharge current of the electricity.
Second, the core composition of lithium batteries: lithium battery monomer Power lithium battery _ Taobao search Taobao search is the most intelligent product search engine, through the operation of big data, accurate understanding of goods and users, providing accurate personalized search experience. Direct links to s.taobao.com 12V lithium batteries are made up of lithium battery cells in series. From the material and voltage differences, the common lithium batteries on the market are ternary lithium and lithium iron batteries. There is a difference in voltage between the two. The operating voltage of the ternary lithium battery is 2.7V-4.2v, 2.2v-3.2v. On the whole, ternary lithium batteries have higher energy density than iron lithium, which means that the same volume and weight of ternary lithium batteries have larger capacity. Another 12V, three yuan lithium battery as long as three strings, iron lithium battery to four strings. The candidate for the rapeseed was the three-element lithium battery.
After talking about the battery materials, let's talk about the type of discharge.
First of all, there is a high-rate power lithium battery in the discharge of the battery, and a low-capacity capacity lithium battery.
Power battery supports high-current discharge and is usually used in devices with large discharge currents, such as new energy cars and electric cars. Capacity-type batteries are small-current discharges, such as some common digital products and rechargeable energy storage devices.
So what kind of motorcycle start lithium battery? Does this depend on the need for large currents? you guess!
The answer is definitely needed. The high current of the motorcycle battery is mainly at the moment of starting. At this time, the current can reach 160A, which means that the starting motor power momentarily reaches 1920W and the terrible power of nearly 2 kilowatts. Therefore, rape must be equipped with a power battery. This time, the rape was taken from the electric car in the home and the BAK 26700 power tri-metal lithium battery was perfect. A battery of 5000mah, two and three strings can be assembled from the 12V10A lithium battery.
For questions about battery selection, please contact us at ychadmin!
Rape was tested and the three batteries were connected in series to start the motorcycle. However, in order to be more stable, the rapeseed jun has used a four-and-three-string series of such sub-capacity to reach 20A, the same volume as the original, but the battery capacity is nearly three times the capacity of the original lead-acid battery.
Battery cell equalizationFirst test the internal resistance of the battery, select a battery with a small internal resistance, and have built-in consistency.
Next, charge each battery to 4.2V and pick out a battery with a relatively uniform capacity for assembly.
The above two steps are important steps for the battery's durability and maximum capacity. After completing these two steps, you can enter the assembly process.
Safety first, insulation!
The next step was to move the spot welder on and off the battery. It is suggested that everyone should spend a small amount of money when assembling, buy battery holders, and use battery holders for assembly to protect the battery. The other is to pay attention to the insulation of the nickel strips and the non-welded parts of the battery. Because the battery installed in the vehicle is inevitably squeezed by vibration and deceleration, the nickel strip may also be heated when it is energized, and the short circuit may be caused by the heat of the battery insulation or continuous vibration.
Lithium Battery Holder _ Taobao Search Taobao Search is the most intelligent product search engine, through the operation of big data, accurate understanding of goods and users, providing accurate personalized search experience. Direct links to s.taobao.com 
Therefore, special attention must be paid to the insulation of the nickel strips and the non-spotted areas of the battery, especially the nickel strips at the positive electrode. There is a check for whether the battery is under welding.
After testing, the voltage of the positive and negative terminals of the battery is tested to see if it is about 12V. If so, it means that the entire series circuit is completed. The next step is to install the protection board. If not, then you have to check if the row is wrong. Three strings, people can not go wrong, but still careful.
Protection board, lithium battery charge and discharge protection God.
For tires, is there a maximum tire pressure and minimum air pressure? Too high tires are too explosive and the tires are bad. The same applies to lithium batteries. The voltage should not be too high nor too low. At the same time, the current also needs to be within the scope of safety approval. Otherwise it may cause irreversible damage to the battery, and even bring other hidden dangers.
Due to the requirement of the voltage and the voltage of the lithium battery and the current size, there is a need for a protection board to protect the current and voltage.
Current protection, the role of the protection board is to define the maximum current for charging and discharging.
Voltage protection: The charging process limits the maximum charge voltage to 4.25V, and the discharge process limits the minimum voltage to 2.7v.
For the start of the motorcycle, we do not need to control the voltage, this is consistent with the main current, the need for large current.
The general protection board on the market does not reach such a large phone number. Generally it is used in what kind of electric fish machine, what sprayer, this current is generally 10-30A to get it. Achieving a 160A protection plate is expensive and basically requires nearly a hundred dollars.
Rapeseed rape is to carry on the transformation of the discharge end of the protection plate of 30A, joined 5 can support the maximum current 40A high current MOS tube. This discharge current can reach 200A. The next step is to connect the positive and negative electrodes and the equalization line according to the requirements of the circuit board.
After doing a good job, it began to use a lithium capacity tester to test its charge and discharge, and check whether the circuit is charged and discharged properly. After charging and discharging are normal, charge protection is tested. For motorcycle batteries, charging protection is more critical.
(Forgot to take a picture, look for the picture of the 18650, which is the capacity tester)
As the motorcycle runs fast, the voltage of the generator motor can reach 14.8V. This is a lithium battery charging voltage exceeding 12.6V. If there is no protection board, it will cause overcharge. Therefore, charging protection is critical for a motorcycle starter battery. So we need to focus on testing. We use a capacity tester to charge it. In order to simulate the voltage value of the motorcycle, we charge the battery with a constant voltage of 14.8V to see if the protection board can perform power-off protection when the battery is full of 12.6v.
After testing, it can be achieved.
Compared to the charging protection, the discharge voltage protection rape can not be very much for motorcycles. why?
Because the motorcycle once started, in fact, the main power supply is no longer a battery but a motorcycle's generator motor, the battery is only to stabilize the circuit voltage and current, a bit like a super capacitor in the circuit. Unless you do not start the car for a large amount of electricity or if the locomotive is not used for a long time, it may lead to battery loss. Therefore, the discharge voltage is relatively less important.
Well, after completing these steps, a complete motorcycle start-up lithium battery is completed.
Box test voltage is normal! Successful completion!
Modified into a power lithium battery, test the feeling of a really cool! Finally love Lithium DIY welcome to join the WeChat Jun ychadmin exchange!
Women will go for a pair of shoes for a pair of shoes or, for a bag, a pair of clothes.
The man will start the battery for a locomotive to DIY. - Rape!
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