High-Standard Lithium Batteries In Series And Parallel

Polymer lithium batteries have the advantages of small size, light weight and high energy density, and are widely used in various electronic devices. But do you know that when we use these batteries in series, their voltages will add up. This is very important for devices that require high voltage, such as some drones or electric vehicles.

 

The Basics of Polymer Lithium-Ion Batteries

First of all, we need to understand how Li-Po batteries work. Simply put, it's about lithium ions shuttling back and forth between the positive and negative electrodes to complete the charging and discharging process. This process is like a meticulously choreographed dance, where lithium ions, under the influence of an electric field, travel from the positive electrode, through the electrolyte, and finally reach the negative electrode, or vice versa. When we connect batteries in series, it's like linking several small buckets in a line, allowing the water flow (current) to pass through each bucket, thereby achieving a high overall voltage output.

 

The Importance of Voltage Consistency

Voltage consistency is of vital importance for battery packs. Imagine if the voltages of the cells in your battery pack were all different. During discharge, the cells with lower voltages would be depleted first, while those with higher voltages might be over-discharged. This not only reduces the overall performance of the battery pack but also shortens the lifespan of the batteries. Therefore, it is necessary to use professional equipment to test and balance the voltages within the battery pack, ensuring that each cell's voltage remains within a relatively consistent range.

 

Battery capacity matching

Battery capacity matching is equally important for the performance of a battery pack. If the capacities of the cells in the battery pack do not match, during discharge, the cells with smaller capacities will be depleted first, while the cells with larger capacities may be over-discharged. This is like an unfair relay race, where some runners run fast and some run slow, ultimately affecting the overall performance of the team. Therefore, we need to conduct discharge tests to determine the capacity of each cell and ensure that they can work together and perform at their best.

 

The role of internal resistance consistency

Internal resistance is the abbreviation for the internal resistance of the battery cell. It has a direct impact on the performance of the battery. If the internal resistance of the battery cell is too high, a large voltage drop will occur when the current passes through, causing the battery cell to heat up and reducing efficiency. This is like a congested road where vehicles move slowly and traffic efficiency is low. Therefore, we need to use professional testing instruments to measure the internal resistance of each battery cell to ensure that they can smoothly transmit current and improve the overall efficiency of the battery pack.

 

Analysis of Charge-Discharge Curves

The charge-discharge curve is an important tool for evaluating battery performance. By analyzing the charge-discharge curve, we can obtain information such as the charging and discharging efficiency, internal resistance, and capacity of the battery. An ideal charge-discharge curve should be smooth without any abrupt changes, indicating that the battery is functioning properly. If the curve shows abnormalities, such as a sudden rise or drop, it may be a sign of a problem with the battery, and at this point, we need to take measures.

 

Evaluation of battery cycle life

The cycle life of a battery refers to the number of times it can be charged and discharged before its performance drops to a certain level. It is similar to an athlete's endurance; the better the endurance, the longer the athlete can run. Strategies to extend the battery cycle life include proper charging and discharging, avoiding extreme temperatures, etc. These can help our batteries last longer.

 

Safety considerations

Safety is always the top priority, right? Overcharging, overdischarging, short circuits and overheating can all cause damage to the battery. Fortunately, most modern batteries have protection mechanisms to prevent these situations from occurring. Additionally, safety certification marks can give us peace of mind, as they indicate that the battery has passed rigorous safety tests with certification.

 

The influence of temperature characteristics on performance

The impact of temperature on battery performance is obvious. In extremely cold or hot environments, the performance of the battery will be greatly reduced. Therefore, managing the temperature of the battery is very important. We can use a thermal management system to ensure that the battery operates within an appropriate temperature range.

 

Factors affecting self-discharge rate

Self-discharge rate refers to the rate at which a battery loses its charge when not in use. If the self-discharge rate is high, the battery will lose its charge rapidly during storage. We can address this issue by choosing batteries with a low self-discharge rate and storing them under appropriate conditions.

 

Production and Manufacturing Quality

The manufacturing process has a direct impact on the performance of batteries. High-quality manufacturing means that the performance of the batteries is more stable and safer. We can determine the quality by inspecting the appearance of the batteries and understanding the manufacturing process.

 

The Value of Brands and Certifications

Choosing batteries from well-known brands is like choosing a reliable partner. Well-known brands usually imply better quality assurance and after-sales service. Moreover, the safety certification of battery products is also very important as it indicates that the products have passed a series of safety tests.

 

The function of the battery management system (BMS)

The battery management system (BMS) is like the personal doctor of the battery. It is responsible for monitoring the state of the battery and ensuring its safety. A high-quality BMS can precisely monitor the battery and has a long service life, which is very important for the battery pack.

 

As mentioned above, we hope you have a deeper understanding of polymer lithium batteries. Whether you are choosing batteries or using them, you should take into account their quality safety and maintenance. Finally, select high-quality polymer lithium batteries that suit your needs.

 

Item	description	parameter
1	nominal voltage	3.7V
2	Nominal capacity	1800mAh
3	standard discharge continuous current	0.5C/0.9A
4	maximum discharge continuous current	1C/1.8A
5	the range of operating voltage	4.25~2.75V
6	charging mode	4.25V constant current and constant voltage
7	Charging current	≤0.9A
8	Charging temperature	0~45℃
9	discharging temperature	-20~60℃
10	Overcharge protection voltage	4.25士0.025V/ in series
11	Over-discharge protection voltage	2.75±0.05 V/in series
12	Overcurrent value	3~5A
13	dimensions	52(L)x 34(W)x 10(H)
14	Internal resistance of the final battery	≤50mΩ
15	Final battery weight	≤15g