Nickel Metal Hydride No. 5 battery

　　Which is better, polymer lithium battery or Nickel Metal Hydride No. 5 battery?

　　What is the difference between polymer lithium batteries and lithium-ion batteries? The main difference between them is the electrolyte. Lithium-ion batteries use liquid electrolytes, while polymer lithium batteries use solid polymer electrolytes instead. This polymer can be "dry" or "colloidal". Most currently use polymer gel electrolytes. So which one is better, polymer lithium battery or lithium-ion battery?

　　Polymer lithium battery is an upgraded product of lithium-ion battery. Compared with the currently popular lithium-ion batteries, it has the advantages of large capacity, small size, and safety. However, since the replacement of the entire industry chain takes a certain amount of time, the current cost is still relatively high, and it is only used in high-end digital products (ultra-thin laptops, etc.).

　　The advantages of polymer lithium batteries mainly include the following aspects:

　　1. The working voltage of polymer lithium battery single cell is as high as 3.6v~3.8v, which is much higher than the 1.2V voltage of nickel metal hydride and nickel cadmium batteries.

　　2. High capacity density, its capacity density is 1, 5 to 2, 5 times that of nickel metal hydride batteries or nickel cadmium batteries, or even higher.

　　3. The self-discharge is small, and the capacity loss is also very small after being left for a long time.

　　4. The polymer lithium battery has a long life, and its cycle life can reach more than 500 times under normal use.

　　5. There is no memory effect. There is no need to drain the remaining power before charging. It is easy to use.

　　6. Good safety performance. The structure of polymer lithium batteries uses aluminum-plastic soft packaging, which is different from the metal casing of liquid batteries. Once a safety hazard occurs, liquid batteries are prone to explosion, while polymer batteries will only bulge at most.

　　7. The thickness is small and can be made even thinner. The lithium polymer battery is ultra-thin and the battery can be assembled into a credit card. Ordinary liquid lithium batteries use a method of customizing the casing first and then plugging the positive and negative electrode materials. There is a technical bottleneck when the thickness is less than 3 or 6 mm. This problem does not exist with polymer batteries. The thickness can be less than 1 mm, which meets the current needs of mobile phones. direction.

　　8. Light weight, lithium polymer batteries using polymer electrolyte do not require a metal shell as a protective outer packaging. Polymer batteries are 40% lighter than steel-cased lithium batteries of the same capacity and 20% lighter than aluminum-cased batteries.

　　9. Large capacity. Polymer lithium batteries have 10-15% higher capacity than steel-shell batteries of the same size and 5-10% higher than aluminum-shell batteries. They have become the first choice for color screen mobile phones and MMS mobile phones. Now there are new color screen batteries on the market. And MMS mobile phones also mostly use polymer batteries.

　　10. Small internal resistance. The internal resistance of polymer lithium battery cells is smaller than that of ordinary liquid cells. At present, the internal resistance of domestic polymer cells can even be below 35mΩ, which greatly reduces the self-consumption of the battery and extends the battery life. The standby time of mobile phones can fully reach the level in line with international standards. This kind of polymer lithium battery that supports large discharge current is an ideal choice for remote control models and has become the most promising product to replace nickel-metal hydride batteries.

　　11. The shape can be customized. Manufacturers do not need to be limited to standard shapes and can economically make them into suitable sizes. Polymer lithium batteries can increase or decrease the cell thickness according to customer needs, and develop new cell models. They are cheap and have a short mold opening cycle. Some can even be customized according to the shape of the mobile phone to make full use of the battery shell space and improve the quality of the battery. battery capacity.

　　12. Good discharge characteristics. Polymer lithium batteries use colloidal electrolytes. Compared with liquid electrolytes, colloidal electrolytes have smooth discharge characteristics and a higher discharge platform.

　　13. The design of the protective board is simple. Due to the use of polymer materials, the polymer lithium battery cells do not fire or explode. The cells themselves have sufficient safety. Therefore, the PTC and fuses can be considered in the design of the polymer battery protection circuit, thus Save battery costs.

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