Correct use of lithium battery



Lithium battery is a more and more widely used energy storage conversion device, because its excellent electrochemical performance realizes the market application scenario of small medium large. When we talk about the correct use of lithium battery, we usually refer to the small application, i.e. consumer electronics, such as smart phones, laptops. Because large and medium-sized applications are based on small application technology, small applications have common characteristics, while large and medium-sized applications are much more complex. Generally, medium-sized applications are on new energy vehicles, which are generally called power batteries; large applications are usually on base stations, which are generally called energy storage batteries. So when we talk about "how to use lithium battery", it is in line with people's habit to limit lithium battery to small-scale applications.            The working principle of lithium battery is nothing more than charging to reserve energy, discharging into other energy and releasing. It is idle when neither charging nor discharging. Therefore, the correct use of lithium battery has three aspects: correct charging, correct discharging and correct maintenance.            Correct charging method of lithium battery            Grasp the time and prevent overcharge. Do the right thing at the right time. Although lithium battery itself has excellent electrochemical performance, however, any thing that deviates from the equilibrium state will have security risks. To be more specific,            1. When charging, charge. In the early days of smart phones, in order to protect their own interests, each mobile phone manufacturer often emphasized using the original charger (including charging line) to charge the electric equipment. Some manufacturers designed special data lines and did not support other chargers (including charging line). Later, with the application of smart phones and laptops becoming more and more widely, it's obvious that they are self-contained in this way, so now we have basically unified the standard, a kind of charger / wire can charge different brands and nature of electric appliances. Charging is convenient. One of the problems that users should pay attention to is to keep the battery with normal power at any time. Under normal circumstances, when the power is too low, mobile phones and laptops will be reminded, and then you need to make up the power in time. Although the power is too low, it will not lead to a direct safety accident, but excessive use will cause damage to the battery structure over time.            2. Just fill it up. The internal part of lithium battery is also composed of many components. The new battery is OK. If it takes a long time, the function of which component may decline, so overcharge safety risk will occur. Samsung and apple were exposed in several typical accidents because the owner of the appliance put the mobile phone on the bedside to charge when sleeping, which finally led to combustion and explosion.            3. Don't use them all at once. I have experienced that it is very easy to feel the heat of mobile phone when using mobile phone while charging, especially when playing games. The truth is also very simple. Mobile phone is equal to playing two jobs at the same time, which makes it have to pay more than twice the labor force, and the body will naturally heat up.            Correct discharge method of lithium battery            Charge in time and prevent over discharge. Ordinary mobile phone users are not aware of the harm of over release, because there are no reports of safety accidents. Moreover, some people even think that regular deep discharge is good for battery performance maintenance. In fact, it is not, because the memory effect of lithium battery can be ignored, there is no deep discharge to eliminate the memory effect. Theoretically, the total cycle life of deep discharge of lithium battery will be longer, but the risk is that excessive discharge of battery will lead to low battery voltage, abnormal charging, sometimes it will take a long time to turn on, or even fail to turn on the machine. Since the two evils are lighter and the service life is shorter, it is better than not to use them. Therefore, it is advised that users of mobile phones and laptops should not often use black screens.            Correct maintenance of lithium battery            The temperature is suitable to prevent cold and hot. When the battery is idle, there is usually no safety accident. The purpose of daily maintenance is to put the battery in a suitable environment, so as to delay the aging of the battery. In fact, one of the parameters in the design of lithium battery is the appropriate temperature. Relatively speaking, the problem of low temperature is not big. But if it is put at a higher temperature, as the saying goes, extremes are bound to reverse, it will also cause safety problems. The idle state is just for the normal environment. If the lithium battery is put in the water or near the fire source, it will be out of the topic of "maintenance". What should we do in the normal environment? The water side is moisture-proof and the heat side is sun proof. Therefore, the appropriate environment for daily maintenance of lithium battery should be four words: ventilation and cool. These four words should be followed no matter whether the lithium battery is idle independently or in the electrical appliances.            In the correct use of lithium battery, the charging method of lithium battery is the most important, because the incorrect charging method will cause safety problems, while the discharge and daily maintenance only affect the service life of lithium battery, and lithium battery itself is a kind of consumable. No matter what method we take, we can not avoid its final loss, but we use the right method to delay its decline It's just old.

Previous: What are the factors that influence the price of lithium battery? abstract The price of lithium battery is mainly composed of three parts: cell, protection plate and shell. At the same time, due to the power consumption and current of electrical appliances, the selection of materials (conventional nickel sheet, formed nickel sheet, copper nickel composite sheet, jumper sheet, etc.) for connecting pieces between cells will affect the cost. Different connectors Price composition of lithium battery The price of lithium battery is mainly composed of three parts: cell, protection plate and shell. At the same time, due to the power consumption and current of the electric appliances, the cost of the selection of connecting pieces between the cells (conventional nickel piece, formed nickel piece, copper nickel composite piece, jumper piece, etc.) will be affected. Different connectors (such as aviation plug, from ten yuan to thousands of yuan) are also possible It has a great impact on the cost, as well as different pack processes. Factors influencing the price of lithium battery 1、 Selection of electric core: First, the selection of different materials will affect the price of the whole lithium battery. According to the different cathode materials, lithium manganate (3.6V), lithium cobaltite (3.7V / 3.8V), nickel cobalt lithium manganate (commonly known as ternary, 3.6V), lithium iron phosphate (3.2V), lithium titanate (2.3V / 2.4V) and other materials, the voltage platform, safety factor, cycle use times, energy density ratio, operating temperature of different materials are different. Second, the prices of different brands of electric core will vary greatly. The total price gradient can be divided into: special electric core (including ultra-low temperature, ultra-high temperature, ultra-high magnification, and heteromorphic), Japanese Series (Panasonic, Sanyo, Sony), Korean series (Samsung, LG), domestic series (domestic series is divided into one line (Lishen, bik, BYD, ATL), two lines, and even five lines and six lines), the same as The price difference of different brands of electric core in material system will be very large, and the quality (safety type, consistency, stability) of each brand of electric core through the survival of the fittest in the market is basically proportional to the price. 2、 Demand and design of lithium battery PCM PCM design can be divided into: basic protection, communication, BMS Basic protection: the basic protection includes overcharge, over discharge, over-current and short-circuit protection, and the over temperature protection can be added according to the product demand Communication: the communication protocol can be divided into I2C, RS485, RS232, CANbus, HDQ, SMBus, etc. there is also a simple power display, which can be indicated by LED with a power meter. BMS: BMS is the first letter combination of batterymanagementsystem, which is called battery management system, commonly known as battery nanny or battery housekeeper. It is mainly for intelligent management and maintenance of each battery unit, to prevent over charging and over discharging of battery, to extend the service life of battery, and to monitor the state of battery. Its main functions include: real-time monitoring of battery physical parameters; battery state estimation; online diagnosis and early warning; charge, discharge and precharge control; balance management and thermal management. The secondary system is mostly used in electric vehicle batteries. 3、 Demand and design of lithium battery shell Lithium battery shell design can be divided into: PVC heat seal, plastic, metal PVC heat seal: what kind of enclosure is used for the external part of the battery pack mainly depends on the specific needs of the customer's products. For the packaging form of PVC heat seal, it is generally applicable to the case where the number of parallel cells is small and the overall weight is light (≤ 2kg). However, for batteries with an overall weight of more than or equal to 1kg, it is necessary to add a fixed bracket between the cells and a glass fiber board around the battery, and then use PVC heat seal. Plastic: the plastic shell is used, mainly after different battery groups are finalized, the shell involved may need to be mold opened, and the mold cost is not a small expense. For example, in the early stage of development, the product is not finalized, you can use the hand plate shell proofing (the strength of the hand plate is not as strong as the material strength after mold opening and finalization), and the requirements for the material and technology of the shell (especially with the three proofing requirements) are different, but also Impact costs. Metal: the metal shell is the same as the plastic shell. Before the product is not finalized or the quantity demand is not much. It is recommended to use sheet metal to make samples. This is mainly because the sample preparation and delivery period is short. If the batch is large, it is also recommended to open the mold. For the metal shell with waterproof level requirements, it will also greatly affect the cost, and for the metal shell with special materials (such as titanium alloy, etc.), the cost will be higher. The cost of lithium battery is mainly composed of cell, PCM and structural parts. In addition, pack cost, aging cost and management cost of the enterprise are required. At the same time, the price of lithium battery will vary greatly due to the different requirements of product technical difficulty, purchase amount and defect rate!

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