Laptop batteries are the batteries inside laptops. Nowadays, using rechargeable batteries is one of the advantages of laptops compared to desktop computers, as it can greatly facilitate the use of laptops in various environments. The earliest battery introduced was nickel cadmium battery (NiCd), but this type of battery had a "memory effect" and had to be discharged before each charge, making it very inconvenient to use. It was soon replaced by nickel hydrogen battery (NiMH), which not only did not have a "memory effect" but also increased the battery capacity by 10% per unit weight. The function of a battery is to enable laptops to stand by and work without AC power. It mainly relies on the battery cells inside to maintain energy, which can be said that the quality of the battery cells determines the quality of the battery. A normal laptop battery should have a standby time of no less than 2 hours. The working principle of laptop batteries is generally 2 in parallel and 3 in series, which means 2 in parallel. Then, 3 sets of 2 parallel batteries are connected in series, sometimes also known as 6 cells, which means 6 batteries. There are also ultra-thin batteries that use 4 cells, and thickened batteries that use 8 cells. Their working principle is the same. The more cells, the longer the standby time. The internal structure of a laptop battery mainly consists of three parts: battery cells, charge and discharge control circuit boards, and temperature feedback wires. The battery cell is the energy center of the battery, responsible for countless charging and discharging tasks. The circuit board is used to control the charging and discharging of the battery cell, allowing charging when the battery cell is low, and cutting off charging when the battery cell is full. Due to the large capacity of laptop battery cells, they undergo intense chemical reactions during use. Therefore, for safety reasons, it is necessary to strictly control the temperature of the battery cells not to be too high. The temperature feedback line plays a very important role here; When the temperature exceeds a certain level, it can be immediately cut off by delivering it to the circuit board through the temperature feedback line
Function of testing report:
1. Project bidding: Issue authoritative third-party CMA/CNAS qualification report
2. Online e-commerce platform entry: Quality inspection report recognized by major e-commerce platforms 3. Used as a sales report: issuing legally effective testing reports to make consumers more confident 4. Papers and research: Provide professional personalized testing needs 5. Judicial services: providing scientific, fair, and accurate testing data 6. Industrial problem diagnosis: Verify the troubleshooting and correction of industrial production problemsBaijian and testing process:
1. Telephone communication and confirmation of requirements
2. Recommend solutions and confirm quotations 3. Mail samples and arrange testing 4. Progress tracking and result feedback 5. Provide reports and after-sales service 6. If urgent or priority processing is requiredTesting and testing characteristics:
1. The testing industry is fully covered, meeting different testing needs
2. Fully cover the laboratory and allocate localized testing nearby3. Engineers provide one-on-one services to make testing more accurate
4. Free initial testing, with no testing fees charged
5. Self service order delivery for free on-site sampling
6. Short cycle, low cost, and attentive service 7. Possess authoritative qualifications such as CMA, CNAS, CAL, etc 8. The testing report is authoritative and effective, and is generally used in China