There is a layer on the surface of the polymer cell that looks like moldy 30

Cocoon electricity, which should be caused by improper handling, can not be wiped with a paper towel, you can often wipe it with a cotton swab with some liquid water.

Polymer batteries are usually wound or laminated. The silvery-white color is aluminum foil (positive electrode), the brass color is copper foil (negative electrode), and the middle is the diaphragm. Please avoid any contact between the positive and negative electrodes when dismantling the banquet friends, otherwise there will be a short circuit.

The batteries are like this, otherwise how could Xiaoxiang have a non-professional request not to move the bird.

There are two reasons why polymer batteries bulge:

1. In the production and manufacturing of polymer batteries, the production level and production process of the manufacturer are insufficient, resulting in uneven electrode coating and drumming of polymer batteries.

2. In the process of using the polymer battery, the polymer battery is overcharged and discharged, and the internal temperature of the battery continues to rise, the internal pressure increases, and the pressure reaches a certain level, causing expansion and rupture.

Both of these factors will cause a violent reaction similar to a short circuit inside the battery during use, generating a large amount of heat, which in turn will cause the electrolyte to decompose and vaporize, and the battery will bulge.

The polymer battery bulging is caused by damage to the separator inside, and gas is generated inside the battery. Under normal circumstances, if there is no problem with the manufacturing process of the battery, the battery will not easily bulge, unless the discharge rate of the battery is too different from the discharge rate you are using, which causes over-discharge to cause the separator layer to be damaged and produce slight gas. Of course, there are many new cell manufacturers, because the production process or process (winding lamination) is not mature enough, resulting in the manufacturing process of the hem is not sealed or not firmly bonded, etc., even if you do not use such cells, after a period of time will be bulging or leaking.

Polymer cells are also an integral part of lithium-ion batteries. The composition of a lithium-ion rechargeable battery is as follows: cell + protective circuit board.

The rechargeable battery is the battery cell by removing the protective circuit board. He is the storage part of the rechargeable battery. The quality of the battery cell directly determines the quality of the rechargeable battery. [1]

What distinguishes polymer cells from traditional lithium-ion batteries is the production process. Lithium batteries are wound and have a softer volume. The polymer is superimposed and has a stiff body.

For the same volume of polymer and lithium battery, the capacity of the polymer is larger, about 30% higher. And it's safer, with less risk.

1.In fact, polymer cells also belong to lithium cells. Lithium battery cells are divided into:

There are two kinds of liquid lithium-ion battery cells and polymer batteries, both of which have the same positive and negative electrode materials, but the electrolyte materials are different, the liquid lithium-ion battery cell electrolyte is liquid, and the polymer cell electrolyte is gelatinous.

2.The two cells have their own characteristics: liquid lithium-ion cells:

The discharge power is higher and more crash-resistant (the shell is a steel case); The shape of the polymer cell is variable, but it is not crash-resistant (the housing is a soft aluminum-plastic film). Pinsheng mobile power supply is mostly used in high-quality 18650 battery cells (now the mainstream battery cells of notebooks), which belongs to liquid lithium-ion batteries, which are wrapped in steel shells, with Pinsheng's self-designed PCB safety protection board, which can effectively prevent overcurrent, overvoltage, and short circuit, which is extremely stable, please rest assured to use.

3.In terms of single volume capacity, Pinsheng mobile power banks all use high-capacity cells, and the single volume capacity is similar to that of polymer cells on the market.

1. The metal plate is a steel sheet wrapped when the polymer cell is packed, which is used to protect the battery cell and increase the hardness of the battery;

2. The polymer battery cell should not be broken and played casually, the inner core of the polymer battery is mainly composed of negative electrode piece, positive electrode piece and separator film, this layer of separator film is between the positive and negative electrode pieces, which plays the purpose of blocking the contact between the positive and negative electrode pieces to prevent short circuit, the separator film is a very thin polymer film, the general thickness is about, it is easy to be damaged, once the separator is damaged, the contact between the positive and negative electrode pieces will cause a short circuit will cause the battery to heat up and even **, the separator in the process of breaking the battery will be likely to cause damage. Moreover, in the process of breaking the battery, the positive and negative electrode pieces and packaging tapes will also be damaged, affecting the performance of the battery.

3. After removing the metal plate, the battery's ability to resist external mechanical puncture is greatly reduced, and the safety will deteriorate, the polymer packaging bag is a composite film, and only a layer of aluminum sheet plays a supporting role, and the mechanical strength is very low, and it basically does not have a strong anti-puncture ability.

4. The hand-pinched deformation of the pouch battery has a certain impact on the battery, and the local force may cause damage to the electrode sheet and separator, and the electrolyte distribution inside the battery will be affected after deformation, but if it is not serious, the impact will not be particularly obvious.

ps: I have to say, your battery is too copycat, you assemble it yourself, right? There are problems with the size, and it is very strange that the soft package is soft like this, and the pack method is also very avant-garde! It is recommended to buy genuine original batteries, but it involves personal and property safety!

Comparison of the advantages and disadvantages of lithium cells and polymer cells.

The advantage of lithium battery cells is that the discharge power is large, and the ultimate current is greater than that of polymer cells at the same voltage, that is to say, the output performance of lithium batteries is good, and the power is large, which can be used in some devices that require instantaneous high current, which can ensure the stability of the system.

The disadvantage of lithium battery cells is that their capacity is small, generally about 800mAh, and lithium batteries are unstable, easy to short circuit and external harsh environments, and the metal shell on its surface is extremely lethal when lithium cells are short-circuited.

The advantage of polymer cells is that they have a strong endurance and large capacity, and the capacity of polymer cells of the same volume is 20% larger than that of lithium cells.

The disadvantage is that the peak current is not as large as that of lithium cells, and it is a little stretched in some cases where instantaneous high current is required.

Lithium polymer battery cells are a type of electrical energy storage.

Lithium polymer cells can be made into columns, soft packs or cubes. It is composed of cathode and anode materials and separators, used to store electrical energy, under the action of voltage when charging, the free electrons move to the cathode, so that the charge of the positive electrode all moves to the cathode plate, forming a voltage difference, and the electrons flow out of the cathode during discharge, and return to the anode through electrical equipment, the voltage difference gradually decreases until the electrons all return to the anode, and the voltage is 0, but in order to ensure that the battery cell can be charged repeatedly, a certain charge is generally retained at the cathode to ensure the activity of the cell!

The role of storing electrical energy. Polymers divide and store lithium, and then slowly release electricity.