Let life roll in the toss, rape DIY digital series 3
The 6V and 12V batteries are commonly used in people's daily life. For example, many batteries of motorcycles are 12V, and the DC voltage of cars is also 12V. So, candied rape to customize this 12V lithium battery?
The rapeseed king is a locomotive controlled and usually likes to ride. The south is very suitable for riding. You see Taiwan across the Taiwan Strait is where the locomotive culture is prevalent.
In Taiwan, locomotives are more than just culture
Frankly speaking, the Royal Park is no better than riding in the South. Two reasons: The haze is also the climate.
The Royal Park is worth riding than the South, but also for two reasons: shake not on the number, blocking!
Energy-saving, environmental protection, green travel, motorcycle is a good choice, but we still have to be civilized and law-abiding. There are oil cars and electric motorcycles in the rapeseed Jun family, although all documents are legally complete, but the oil car is Beijing B license, is in the third ring, or less riding is good, although the police uncle usually regardless, once the tube is the deduction Three points penalties. The general urban area is also a short distance, the rape is still riding a tram more.
Digression, whether in the Royal Park is riding a bicycle or electric motorcycle, it is recommended that the best are to increase the D license or E card. If you do not have a problem, according to the law, driving without a license is your responsibility. The rape drive in Beijing was won in two weeks, and the D-drive was increased.
Since riding, in Beijing's hazy environment, it would have to face a problem car wash!
This is the former rapeseed Jun car, just after washing met Beijing red haze, riding for three days became like this, it was looked particularly silent, took a picture.
White car is not tolerated dirty! Electric car this car to go to the car wash shop to wash the total feeling is loaded, it is not worthwhile. Two buckets of water to buy their own 12V car wash pump, you can get in 5 minutes. After all, downstairs, you have to bring your own mobile power. Originally, I used two small 12V lead-acid batteries. Later, because I wanted to be a lithium battery, I had a larger capacity. Second, the power supply current was higher, and the horsepower contributed to the high water pressure of the car wash motor. The price of the original two 1.3AH 12V lead-acid battery cabbages was put out on local fish.
——The above picture shows a small lead-acid battery with small capacity and current. It was taken out by Bai Jiajia.
Check out the Internet after the check out, a little brand of 12V lithium battery, you have to move three or five hundred. Cheaper, you do not even know that workmanship and lithium battery in the end what kind of difference! So I plan to make a suitable one myself and I just have a lot of lithium batteries left in my home. Do it yourself, and then use the downstairs car wash or 12V electric air pump.
To do it dry, to make a 12V lithium battery, you first have to prepare the material.
This selected battery is a polymer lithium battery, commonly known as soft lithium battery. It is a power telecommunication used in electric vehicles. One set is two parallel-connected capacities of 10A and a nominal voltage of 3.7. To make a 12V10A lithium battery only need 3 sets of series plus protection board on the line.
Several principles of DIYIn fact, simply take the lithium battery in series under the package, without protection board streaking can also be used. However, according to Rape, DIY is to be safe, stable and durable.
The first is the issue of safety. When it comes to electricity, the first step must be to consider safety issues. Once this thing is short-circuited or protected by no current limit, it may cause other safety hazards. So some still have to have.
The other is to be stable and durable, their own DIY can not be compared to those of industrial production, there is still a gap in the process, but we must try to make the quality of DIY to be as cost-effective as possible to achieve a stable and practical.
DIY12V lithium battery required materialsWell, after clarifying these two requirements, we started to prepare other components besides the battery:
1, lithium battery monomer,
2, protection board
3, battery shell
Li-ion battery, everyone according to the discharge rate and capacity of their own choice I will not say more. The next step is to choose the lithium protection board. The main function of the protection board is to ensure the normal use of the battery by controlling the charging and discharging of the lithium battery. Its protection is mainly reflected in the following two aspects:
First, the maximum current is limited. When the current is greater than the limit current, power-off protection is performed to prevent the battery from being burned. For example, the custom-designed Li-ion battery protection board for rapeseed is for continuous 9A discharge. The over-discharge current is 20A. Once the current reaches 20A, it will be protected against power failure. So if you accidentally short the battery. The protection board will be protected against power failure to prevent the battery from being burned.
The second is the charge and discharge voltage protection. The overcharge and overdischarge of a lithium battery will cause the battery to decay rapidly and even deteriorate. The general battery charge and discharge voltage is between 4.25-2.7V. Therefore, when charging, the function of the protection board is to monitor the voltage of each string of batteries. If any string of batteries is higher than 4.25V, the circuit is disconnected to stop charging. When discharging, it is the opposite, monitor the lowest voltage, if any string of batteries is lower than 2.7V, disconnect the power supply circuit.
Rape Jun to talk about how to choose lithium protection board:
1, powerThe output power of the protection board is greater than the power used.
Rape Jun's car wash pump is 70W, protection board 6A can reach 72W power, but still have to choose slightly bigger.
If the selected power is too small, your device may not work properly, or it may cause the lithium battery protection board to burn for a long time. For example, the current of the protection board I selected lasted for 9A. Then, we all learned that the maximum power for continuous work is 12V*9A=108W. That is, the power of the equipment you supply should be within 108W. For example, we often use the LED and so on, this home is generally very bright 10W. Generally enough, of course, if you want to connect the inverter, such as power, you have to protect the board of high current, rape rape also purchased a high power protection board 50A continuous current, 600W, etc. It can come in handy when using high currents.
2. Is it balanced?The general equilibrium board will be more expensive than the unbalanced board. Without considering the money, under the same current, it must be the balance board. The role of the equalizer board is to balance the battery during charging to ensure that the capacity and voltage of each battery string are the same. The series connection of lithium batteries follows the principle of a cask. The discharge capacity of a battery depends on the battery with the lowest capacity and voltage in series.
The barrel effect of a lithium battery pack - the capacity of the battery pack depends on the smallest string.
For example, if you take three lithium batteries (1A, 10A, 10A) in series, the final discharge is only 1A, and the other two 10A heroes are also useless. So once it comes to tandem, the battery consistency is good and the capacity utilization of each battery is higher.
The role of balance is when the battery capacity and internal resistance are different. For a balanced discharge in a battery that is fully charged in series, it is guaranteed that an undercharged battery will continue to charge.
If the consistency of your battery is very good, adjust the voltage of each string when assembling, and keep the same, then the balance of the protection board is very small. When the battery is used for a period of time, there is a difference. At this time, the balance board The role comes in handy.
Since my 12V10AH lithium battery is currently mainly used for car washing, the number of uses is not much, so I bought a 9A protection board with no balance, 50A is ready to assemble high-end point with a balanced function.
In addition, the protection board eventually protects the battery. If your protection board has a maximum current of 9A, your selected battery will only support 5A discharge. At this time, if the current is too large, it is not the protection board but the battery which is burned out, which does not achieve the protection function, so the protection board also needs to be determined according to the actual discharge current capacity of the battery.
Refused to rush to find a suitable housing
The next step is to find a suitable housing that holds the cell and protective plate. It is portable and dustproof and waterproof. After all, I use it on car washes. Without shell protection, it's easy to go wrong.
So after measuring the size of the battery, it is to find a suitable housing that can be stuffed in. Just Ma Yun's home really has a good match, so he orders.
Everything was ready and it began to be assembled.
The 12V lithium battery assembly steps mainly include the following five steps: 1. Battery cell equalizationSince the rapeseed's battery is an idle lithium battery cell, the consistency of the battery is not exactly the same. So mainly test the internal resistance and capacity. Try to keep the internal resistance and capacity of the three strings of batteries relatively consistent.
First, the internal resistance test was performed with an internal resistance tester. The internal resistance was basically 13-15mΩ. The capacity test was performed and the capacity was between 9500-9700mah. Relatively consistent. In addition, I discharged the voltage of each string to 2.7 V. After I assembled it, the battery pack was charged at 12.6 V. After the test, the voltage of each group was tested for consistency. If you don't have a discharge meter, you can reverse it and put every battery fully charged, and then you can assemble it in series.
2, battery seriesAfter the batteries are the same, they can be connected in series. Prior to tandem connection, it is recommended that the battery strings be fixed together so that the circuit can be fixed and the electrodes will not be damaged during movement.
Fix three strings of batteries with fiber tape, and then wrap the battery outside with a bare paper. The protection is, after all, a soft pack battery, not the 18650.
Then the bottom of this soft pack battery often leaks, so you must add a shock absorber. Take the foam tape to stick the layer as a shock absorber. In this way, the bottom will not be easily shaken.
The series connection is the start of the A battery. The negative electrode is empty. This is the negative electrode of the battery. The positive electrode of the B monomer is the negative electrode of the B monomer. The positive electrode of the B monomer is the negative electrode of the C monomer. Then the positive electrode of the C monomer is left. It is the positive electrode of the battery pack.
We can see that my welding is very simple. The fewer lines that are connected in the middle, the smaller the line loss.
In addition, I added a layer of insulation high temperature rubber cloth to prevent the electrodes from touching the short circuit.
Put 8mm pure nickel pieces and cut the length to prepare the solder.
3, battery protection board welding
The welding of the battery protection board mainly follows the wiring specification of the protection board. Special attention must be paid to not connecting the wrong wire. If the connection is wrong, it may be a short circuit, and the large current will easily burn the protection board.
It should be noted that the lines connecting the positive and negative electrodes of the battery and the output positive and negative electrodes must be thick, and they will not be burned when high current flows. The rated current of the wire should exceed the limiting current of the protection plate as much as possible.
Extremely demanding electrical conductivity is better, so I use 10 amps of copper.
The internal wiring can be as short as possible. On the one hand, on the one hand, the line loss is small, and the resistance is not easy to generate heat. On the other hand, the interior is relatively simple, reducing the cross between the wires and reducing the potential short-circuit hazards during subsequent use. Many people will feel that anyway, the wire is covered with insulation and it's okay to rub it all together. Normally it's okay. Once a large current is involved, the temperature of the wire will increase. Even if it is a high-temperature silicone wire, the insulation will become very fragile. A sharp object squeezes the wire, which can easily cause a short circuit.
4, battery function test
After the cable is connected, it is to test whether the voltages at the positive and negative poles of the output of the protection board are the same as the voltages at the positive and negative poles of the battery pack. If they are inconsistent, then it is necessary to check whether the wiring problem or the protection board faults.
Testing before loading the box is mainly to find problems at this time, and it is no longer necessary to rework the box to check it out.
5, the battery box is completedAfter the test is completed, after the battery pack and the protection board are fully charged and discharged, they can be fixed in a box, must be fixed properly, and be properly shock-absorbed. The battery and the battery should be left as far as possible to allow space for thermal expansion and contraction. Buffering. It is impossible to charge and discharge the battery to expand and contract. The huge pressure will cause the battery core to be crushed.
Because it was previously discharged to protection, it was charged after it was installed. It is 12.43V after filling.
In the end, no car was washed today, and a LED standby wick in the living room was turned on. The 3W was very bright. Change the car wash and give everyone a video.
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