4LR44 battery.What factors affect the price of solar lithium circuit lights?

　　Price has always been the biggest concern of customers. People always think that the cheaper the product, the better, but the quality of the product is also uneven. Today, the editor will introduce to you what factors affect the price of lithium battery solar energy?

　　1. Battery core

　　The battery cells currently used in solar energy are 18650 cylindrical, and the raw materials are generally made of a mixture of lithium cobalt oxide, lithium manganate, and ternary lithium. It is produced through a certain proportion of the mixture of the three and a certain process. The outer packaging is mainly made of aluminum plastic film, and the lithium substance in the middle is in the form of paste. If the quality of the products produced is not up to standard, the biggest danger is explosion. We have seen some lithium batteries used in solar street lights catch fire before. Hayou cannot use inferior protective boards. When fully charged, a good protective board can ensure that the voltage difference between each single cell is less than the set value (generally ±20mV), achieving equal charging of each single cell in the battery pack, effectively Improved the charging effect in series charging mode. At the same time, it detects the overvoltage, undervoltage, overcurrent, short circuit and overtemperature status of each single cell in the battery pack to protect and extend the service life of the battery. Under-voltage protection prevents each single battery from being damaged due to over-discharge when it is being discharged, and rejects inferior batteries.

　　lithium battery

　　Low temperature lithium iron phosphate battery 3.2V 20A -20℃ charging, -40℃ 3C discharge capacity ≥70%

　　Charging temperature: -20~45℃ -Discharge temperature: -40~+55℃ -40℃ Supports maximum discharge rate: 3C -40℃ 3C discharge capacity retention rate ≥70%

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　　2. Lamp holder

　　The price of LED street lamp heads varies greatly due to the difference in style. The most commonly used lamps on the market now are Jindou lamps, which have a simple shape and range from 20-200W. On the other hand, they are cheap. You can use it if there are no strict requirements for the lamp head. On the other hand, the weight of the lamp shell is also the same and the price of the street lamp head is different. The greater the weight of the aluminum die-cast lamp head, the greater its heat dissipation and strength.

　　LED torch street lamp holder

　　3. Controller

　　The selection of lithium battery controllers is also different according to the number of series and parallel LED light sources. They are generally divided into two types: boost and buck. The price of the buck controller will be lower than that of the boost. There is no hard requirement for this. We generally classify the buck as Use within 30W.

　　Low temperature high energy density 18650 3350mAh-40℃ 0.5C discharge capacity ≥60%

　　Charging temperature: 0~45℃ Discharge temperature: -40~+55℃ Specific energy: 240Wh/kg -40℃ Discharge capacity retention rate: 0.5C Discharge capacity ≥ 60%

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　　What is battery PACK? What factors need to be considered in the structural design of lithium battery pack PACK? Many people have asked the editor: What does it mean when I always hear battery PACK? What should I pay attention to in the structural design of battery pack PACK? Don’t worry, don’t worry, save today The editor of Neng Electric is here to give you benefits and explain the basic knowledge of the lithium battery PACK industry, so that you can feast your eyes!

　　What is a battery pack?

　　Battery PACK generally refers to packaging, encapsulation and assembly. Battery PACK generally refers to combined batteries, because lithium batteries are composed of single lithium batteries connected in series and parallel to form a certain voltage and capacity. They are assembled with protective boards and can be charged and discharged. process. For example: if two batteries are connected in series to form a specific shape according to customer requirements, we call it PACK.

　　The PACK battery assembly process is a key step in the production of lithium battery packs, and its importance has become increasingly obvious as the electric vehicle market continues to expand. At present, automotive power batteries basically consist of the following systems: battery modules, battery management systems, thermal management systems, electrical and mechanical systems.

　　Six major factors that need to be considered in the structural design of lithium battery pack PACK:

　　1. Lithium battery pack structure PACK design involves many aspects: such as mechanical structure design, which must consider strength, earthquake resistance, heat dissipation/heating, waterproofing, dustproof, etc.; electrical design, safety regulations, EMC safety regulations, etc. must be considered; and The design of the lithium battery management system must be considered, including overshoot, over-discharge, over-temperature, detection accuracy, battery balance, etc. To ensure the safety and reliability of the battery, it must be reasonably designed and verified by the market.

　　2. Factors to be considered in the structural design of power lithium battery pack PACK

　　a. Waterproof, waterproof grade reaches IP68;

　　b. Maintain the balance of air pressure inside and outside the lithium battery pack. Because the temperature of the battery pack will change during the charging and discharging process, the air pressure in the battery pack will change. The PUW explosion-proof valve is breathable and water-proof, so it can maintain the air pressure in the pack at all times. Like the outside world;

　　c. Explosion-proof. Once the lithium battery pack experiences thermal runaway, the air pressure in the battery pack increases sharply. At this time, the battery pack is in danger of exploding, so the PUW explosion-proof valve becomes a breakthrough and can quickly release the pressure in time;

　　3. In the combination of PACK lithium battery packs, in addition to the control of the safety, reliability and protection level of the battery pack, in terms of cooling and heating, special attention must be paid to the battery connection method and the accuracy of BMS measurement must be considered. This problem is common. , ignoring the impact of voltage drop on the test, thereby affecting the balancing ability of the battery pack.

　　4. Waterproofing and earthquake resistance are both important in the lithium battery pack PACK structure. Speaking of which, the battery PACK is actually a complex. It involves many aspects, but it would be great if the details can be done well;

　　5. Integration of lithium battery PACK structural design: After the individual modules are PACKed, they must be connected in series to form a battery pack. At this time, the serial connectionability of each other should be considered to meet the fast and safe series interface form;

　　6. Internal insulation design issues in battery PACK structure design: The insulation problem of the positive and negative electrodes has been taken into consideration when designing the battery structure, but the uncertain factors of the vehicle battery are too complicated, so it must be designed separately during the PACK battery design process. Predetermined insulation conditions ensure that the battery remains safe and effective in various complex environments such as impact, vibration, and moisture.

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