Making fruit batteries
1. Tools and materials 1·3 lemons (lime, apple, pear, pineapple are also acceptable) 2·3 shiny copper coins. We use five cent coins (or copper sheets), 3.3 galvanized screws (we can also use other more active metals, not necessarily zinc, provided they can be replaced) (or copper sheets). aluminum), 4·4 wires, and finally Good wires come with clips (to hold coins and copper screws). 5. A knife and small paper stickers. 6. Low-voltage light-emitting diodes (LEDs). We use a Radio Shack model 276-330. 7. A 35mm plastic film case or similar small container. It is best to use a casing made of opaque black film. (Used to block light and facilitate observation) 8. A nail or small awl (used to punch holes in the light-shielding container)Conjust drill it as shown below:
It's not easy to drill by hand, please accept it if it helps, or click Satisfied on the top corner right, thank you! !
Why does humidity have such a big impact on batteries?
Tools and Materials
3
Lemons (lime will also work, look for fruits that you think can produce electricity! )
3
shiny copper coins (we use coins)
3
zinc plated screws
4
A wire, preferably with a clamp on the wire.
A pocket knife
Small adhesive paper label
Low voltage light emitting diode (LED). We use the
276-330
model from
Radio
Shack
.
A
35
mm plastic film case or similar small container. It is best to use a casing made of opaque black film.
A nail or a small dotçon
Galvanized screws can be purchased at most hardware stores. They are also called “plated” screws. The screws are galvanized to prevent rusting, giving them a shiny appearance. Wires with clips can be purchased at hardware or electronics stores.
How to prepare it
First, turn over all the lemons, one at a time. Squeeze them with your hands as you turn them until they are a little “soft.” This is done to allow more juice to be produced inside the lemon. This step is very important; it will help you get the best results from your lemon battery.
Screw a galvanized screw about
1/3
into a lemon. Using a knife, carefully make a
1/3
1
cm incision on the other side of the lemon.
Note: BestUse a pocket knife by an adult. Whatever it is, pleasez use the knife “carefully” and “slowly”.
Insert the copper coin into the cutout until half of the coin is in the lemon.
Note: Make sure you use new, shiny parts. If the part is old and dull, use scouring pads to polish the part.
Believe it or not, you can now get electricity from lemons! Like any other battery, the coin is its positive (+) terminal and the screw is its negative (-) terminal. Unfortunately, this battery is weak. But if you have several of these cells, you can put them together to form a lemon battery.
Insert the coin and screw it into the other two lemons like this. Then, using wires and pliers, connect the screw of the first lemon to the coin of the second lemon, and so on, thereby connecting the three lemon batteries together. Also secure the wires with clips to the first piece andthe last screw.
Finally, mark the clip attached to the first piece with a "+" and the clip attached to the last screw with a "-". Like a real battery, a lemon battery has a positive (+) and negative (-) terminal.
When connected in series like this, these lemon cells together produce the same voltage, or potential, as a few small flashlight cells in series, or about
2.5
V to
3
V. But the lemon battery doesn't produce enough current to shine the flashlight bulb.
How can we know if a battery is actually implemented? One solution is to install electrical equipment that only requires
2.5
V to
3
V and does not require not much current. Connect to the battery. A device called a light-emitting diode, also known simply as an LED, may be used. A very low tension and a very small current can cause an LED to emit light.
The LED we use
The description on the box is: 5
5mm red LED
, 1.8
V, 20
mA. This means that the
LED
has a diameter of
5
mm and it only needs < /p>
1.8
Volts and
20
milliamps of current can emit light. In fact, a current less than
20
mA can cause the
LED
to glow slightly. Our lemon battery has enough voltage but not enough current. So we need to find a way to observe the faint light. We put it in a film case to block outside light.
Using a nail, carefully place approximatelyDrill two small holes halfway up. You can ask an adult to help you with this step.
Next, mark one hole with a “+” and the other with a “-”.
Bend the pins
LED
en a gentle outward curve. So take a closer look
LED
. It's basically round. However, if you tilt it at a certain angle, you will see a flat surface near one of the pins. The pin closest to this flat surface is the negative terminal. In the photo, the left pin is the negative terminal of the
LED
. Can you see the small flat area near the leftmost pin?
Align the negative pin of the
LED
with the hole in the film shell marked "-". Insert the
LED
into the film housing. Place the negative pin of the
LED
into the hole marked “-” then the other pin (positive) into the hole marked “+”.
Remove the pins from the holes and check that they match what is indicated on the label. Also label the top of the film case. Make sure the
LED
is facing us.
Let's prepare everything and wait for the lastr moment. Align the “+” side of the film housing containing the
LED
with the “+” clip on the lemon battery. Place the "-" clip of the lemon battery near the "-" side of the film shell.
Now everything is ready! Connect the positive terminal of the
LED
to the positive terminal of the lemon battery. Connect the negative terminal of the
LED
to the negative terminal of the lemon battery. The LED
shines!
But
The LED
emits very weak light because the current coming from the battery is too low. Black film housings help you see dim lights. The end of the LED
acts as a magnifying glass. You can easily see the glow when you look directly at the end of the LED
LED
.
This proves that you actually succeeded in making a working lemon battery! congratulations!
The positive electrode with high nickel content with the negative electrode in carbone-silicon has been recognized in the industry as a technical route for lithium-ion batteries with high specific energy for nickel-based materials, if the air humidity is high. , it is easy to absorb carbon dioxide and carbon dioxide in the air. Water leads to a high proportion of nickel in the material and a higher pH value, thus causing discoloration of the capacity. Affects battery performance. When the material absorbs enough water, a lot of gas will be generated and the pressure inside the battery will increase, causing the battery to deform due to stress, battery swelling, leakage and other dangers .