What is a power lithium battery? What is the difference with ordinary lithium batteries?
There are still many people who have such doubts. If you want to truly understand the difference between power lithium batteries and ordinary lithium batteries, you must consider the application scenarios, safety, cost performance and other aspects. Only in this way can it be true. Understand the difference between power lithium battery and ordinary lithium battery:
1. The application analysis of the difference between power lithium battery and ordinary lithium battery:
1. Power lithium batteries can be used in electric vehicles, electric vehicles, power tools and other high-rate discharge products, while ordinary lithium batteries are only used in mobile phones, bracelets, digital cameras, notebook computers, mobile power supplies, etc. The demand for general discharge power supply with full staff.
2. In product application, it can be understood that power lithium batteries generally refer to the standard of 5C current discharge. If it is an ultra-high rate power battery, it can be discharged at a current of 10C or 30C; ordinary lithium batteries generally use The current discharge current below 3C is the standard judgment.
2. Analysis of the difference between power lithium battery and ordinary lithium battery in terms of design:
1. The R&D and design of lithium iron phosphate power lithium-ion batteries need to consider more reliability and consistency. After all, it takes a long time (at least 5-10 years), harsh environments (low temperature in winter, exposure to sunlight in summer, rain and snow), and a lot of The batteries are used in series and parallel, considering the reliability and consistency, assuming that a car uses 1,000 power batteries, ideally, the car manufacturer hopes that there will be no problems with the scale of 100,000 vehicles per model, that is, the power battery is ideally required The probability of problems (safety, storage, recycling, etc.) should be less than one in 100 million (of course, for the highest-end consumer batteries, Apple also requires suppliers to this level). Considering reliability, power batteries are generally designed with more redundancy, using thicker diaphragms, foils and casings, so the energy density is about half of that of consumer batteries.
2. In the R&D and design of ordinary consumer lithium-ion batteries, safety and durability need to be considered more, and there is no need for long-term reliability (the cycle does not need to be done too well, because it will be replaced in one or two years anyway), and generally do not need to be equipped The group is used alone, so there is not much requirement for consistency. However, due to the limited space and preciousness of consumer mobile phones and tablet computers, consumer lithium-ion batteries have strict requirements on size, capacity, and energy density.
3. The difference between power lithium batteries and ordinary lithium batteries For product safety, power batteries have more external protection circuits, heat dissipation layouts, etc., of course, they also face more severe conditions (higher external voltage, greater current, more complex The external environment), consumer batteries have less protection, and on the basis of higher energy density, the materials and design of the battery can withstand various safety threats; while high-end consumer mobile phone lithium batteries use the most advanced Technology and materials, and power batteries require more advanced process control, consistency control and quality management.
3. Analysis of the difference between power lithium battery and ordinary lithium battery in terms of performance:
1. For example, the lithium iron phosphate power battery is mainly composed of lithium iron phosphate LiFeCoPO4 olivine structure as the cathode material of the lithium battery. The lithium iron phosphate power battery is a type of battery that uses lithium metal or lithium alloy as the cathode material and uses a non-aqueous electrolyte solution. ; Ordinary lithium batteries are dominated by lithium manganese oxide cathode materials, mainly spinel-type lithium manganate materials, spinel-type lithium manganate LiMn2O4 is Hunter first produced in 1981 with a three-dimensional lithium ion channel cathode material ; But with the development trend of lithium battery cathode materials, there may be more high-quality cathode materials to replace current materials, but the safe application of battery materials is more important no matter what.
2. The voltage difference between lithium iron phosphate power battery and lithium battery. What are the main advantages of commonly used lithium batteries? The standard voltage of lithium iron phosphate power battery platform is 3.2V, fully charged is 3.65V, and the discharge cut-off voltage of lithium iron phosphate battery is 2.0V; while the ordinary lithium battery platform voltage is 3.7V, which is 4.2V when fully charged, and the battery discharge is cut off. The voltage is 2.7V. In contrast, the voltage of the lithium battery is higher than the voltage of the power battery; the lithium iron phosphate is resistant to overcharge and overdischarge, and can recover more than 80% after a short time of overdischarge; the lithium ion battery is overdischarged below 2.5V Irreversible damage will occur.
3. The power lithium battery will not fire or explode when punctured, but the normal lithium battery will explode during acupuncture.
4. The lithium iron phosphate power battery will not catch fire and explode if it is overcharged to 100%; ordinary lithium batteries will gas out and swell when they reach the specified value.
5. The difference between power lithium battery and ordinary lithium battery: Lithium iron phosphate power battery can support continuous 30C discharge rate without safety hazards. Some lithium iron phosphate batteries can reach 600A instantaneous current, while ordinary lithium batteries normally support 3C. Discharge rate, continuous high current discharge will cause battery false death.
6. The weight difference between lithium iron phosphate power battery and lithium battery: The weight of lithium iron phosphate power battery of the same volume is nearly double that of ordinary lithium battery.
7. Analyze the difference between power battery and lithium battery from the internal resistance: The internal resistance of the lithium iron phosphate power battery of the same volume is much smaller than that of the ordinary lithium battery.
8. The difference in capacity between power lithium batteries and ordinary lithium batteries: the capacity of lithium iron phosphate power batteries of the same volume is lower than that of ordinary lithium batteries, that is, the energy density of batteries made of lithium iron phosphate cathode materials is 60% lower than that of ordinary lithium batteries about.
9. The price difference between lithium iron phosphate power battery and lithium battery: The price of lithium iron phosphate power battery is about 50% more expensive than that of ordinary lithium batteries.
10. The working temperature difference between lithium iron phosphate power battery and lithium battery: Compared with the working temperature of lithium battery, the working temperature of lithium iron phosphate power battery is higher, while the working temperature of lithium battery is relatively 5 degrees lower. .
What is the difference between power lithium battery and ordinary lithium battery? Investigation and analysis found that the main difference is in battery material selection and discharge rate application. Different lithium battery cathode materials have different applications, and if they are discharged If the magnification is different, it will be easier to subdivide some application scenarios. Only by understanding the difference between these power lithium batteries and ordinary lithium batteries can they be better used for battery selection and program design.
