How to test polymer lithium battery and how to choose them?

　　When testing polymer lithium battery, pay attention to its compatibility, flame retardancy, fault tolerance, explosion-proofness and interference, etc.; when selecting, pay attention to the rated capacity and indicators of the battery. The following is a detailed introduction to the detection, configuration and selection of polymer lithium battery. .

　　1. Six key points for testing polymer lithium battery

　　1. Compatibility

　　The UPS battery online monitoring and management system has electromagnetic compatibility considerations in circuit design and structural design. The metal shell has a good shielding effect, and the system does not have any electromagnetic interference to the outside world.

　　2. Flame retardancy

　　The UPS battery online monitoring and management system uses flame-retardant components and failures caused by system short-circuit and overcurrent will not cause open flames.

　　3. Fault tolerance

　　Each detection channel uses a high-impedance input method, and the current of the detection loop is less than microampere level, which will not affect the battery. Using the design of low-power components, the power consumption of system operation is low, and the requirements for the user's power supply system are not high.

　　4. Explosion-proof

　　The UPS battery online monitoring and management system uses electronic relays, which can switch without channel sparks, without generating open flames to contact connecting equipment, and can also be used in petrochemical and other operations with high explosion-proof requirements.

　　5. Interference

　　The UPS battery online monitoring and management system uses power conversion technology, has a wide operating voltage range, and has strong overcurrent and overvoltage prevention capabilities. The system is also designed with an anti-surge circuit and can operate normally in high-frequency and strong magnetic field environments.

　　6. Maintainability

　　The UPS battery online monitoring and management system uses a modular design and is highly maintainable online. Online maintenance will not affect the normal operation of the user system.

　　2. Configuration and selection of batteries in UPS power supply system

　　1. Selection of rated capacity of battery

　　The actual usable capacity of the battery is closely related to the discharge current, system voltage, discharge time, battery working environment temperature, battery storage time, load type and characteristics and other factors. The capacity of the battery generally refers to the power output (W) of the battery when it is discharged to 1.75V/cell at a 20h discharge rate at 20°C.

　　2. Battery indicator selection

　　Internal resistance: A battery with a small internal resistance should be selected so that it can continue to discharge at a high current. If the internal resistance is large, the power consumption will increase during the charging and discharging process, making the battery hot.

　　Float charge voltage: At the same temperature, a high float charge voltage means large storage energy, and batteries with poor quality generally have a smaller float charge voltage. The battery float voltage value should be corrected at different temperatures.

　　Use 2V single series batteries in large and medium-sized (several kVA to thousands of kVA) UPS to avoid using small-capacity combination batteries for hybrid connection.

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