Basic structure analysis of lithium-ion battery pack:
Important materials: positive electrode, negative electrode, electrolyte, separator
Structure: round, square; lamination, winding
Form: polymer (flexible packaging), liquid lithium ion (steel shell) battery.
At present, the more commonly used lithium-ion battery pack materials are LiCoO₂, LiNiO2, and LiMn₂O₄. The most used material is lithium cobalt oxide, which has good cycle performance and is easy to manufacture. The disadvantage is that cobalt compounds are expensive.
Step 1: Put the rechargeable battery in its approved battery charger and let the device charge for a while.
Step 2: Turn on the multimeter and adjust the measuring knob to measure DC current, making sure to set the dial to at least measure the maximum number of voltages the battery can provide. If the setting on the multimeter matches the voltage provided by the battery, set the dial to measure the next higher voltage value.
For example, if there is a 3.7 volt battery and the meter has a 6 volt setting, set the dial to measure 6 volts.
Step 3: Touch the metal tip of the meter’s black probe lead to the negative (–) end or terminal of the battery, then touch the metal tip of the meter’s red probe lead to the positive (+) end or terminal of the battery. Observe the voltage reading on the multimeter display as you touch them to the battery.
If the voltage is significantly lower than what the battery should have when fully charged, the battery may be nearing the end of its useful number of charges.
Lithium ion battery packs are mainly used to following applicants:
Standard charging mode. Standard temperature 20±5℃ Charging battery consists of charging at a constant current rate of 0.2C until the battery voltage reach 4.2V .then battery be charged at constant voltage of 4.2V while tapering the charge current. Terminal charge until the charging current drops to 0.02C. Anyway, the total charge time for one cycle is not more than 8 hours.
Standard Discharge mode. Standard temperature 23±2℃ discharge to the cut-off voltage with 0.2C current.
Initial Capacity. The standard charge mode for charging, then the standard discharge mode to discharge, measured for the first time the battery capacity is the initial capacity.
Regarding the lithium-ion battery that has not been used for a long time, the voltage cannot be measured outside the lithium-ion battery with a multimeter, and it cannot be charged with a mobile phone or a universal charger. Many people may think that the battery is broken, in fact, the battery may not be damaged at this time, just enter the sleep mode. The voltage of the lithium-ion battery will gradually drop due to self-discharge.
When the voltage is lower than the minimum threshold voltage set by the protection board of the lithium-ion battery, the power output will be automatically cut off, and the lithium-ion battery will enter sleep mode.
No matter which method is used to activate the dormant lithium-ion battery, it cannot be turned on in a hurry. It is recommended to turn on the battery after charging for half an hour.
To understand the real demands of the lithium-ion battery pack, you need to provide the lithium battery size, electrical performance requirements, output requirements, and functional information.
Evaluate a solution and quote the known parameters provided by the customer, also provide full datasheet for reference. We will consider the cell selection, circuit and structure design to final assembly.
After the customer’s approval, we will start to make samples for the lithium-ion battery pack, and provide charging and discharging cycle curve and data.
Before delivering out, we definitely do battery pack aging test. Assist and track customer test results, as well as customer’s overall equipment operation effect.
We will discuss with customer certificate works based on the final country and applicate requests. It may be MSDS, UN38.3, IEC62133, KC, PSE, etc.
Develop process documents and BOM sheet, purchase materials, arrange staff production, quality personnel monitoring, and random inspection, and package and shipment.
Reliable & durable lithium-ion battery manufacturer in China with over 10 years experience.
We will contact you within 1 working day, please pay attention to the email with the suffix “@hlcbattery.com”.