Power lithium battery pack as the key energy storage equipment in electric vehicles, energy storage systems and other fields, its performance has an important impact on the stability and performance of the whole system. In actual use, the power lithium battery pack may be discretized, that is, the performance difference between different battery cells is large. This paper will analyze the discretization phenomenon of dynamic lithium battery pack and its influencing factors.

I. Discretization of dynamic lithium battery pack

the discretization of power lithium battery pack means that the performance of some battery cells is quite different from that of other battery cells, mainly in the following aspects:

1. capacity discretization: the capacity of different battery cells varies greatly, resulting in uneven distribution of electricity between battery cells during charging and discharging, which affects the overall performance of the battery pack.

2. Discretization of internal resistance: the internal resistance of different battery cells varies greatly, resulting in a significant decrease in the performance of some battery cells during high load or rapid charge and discharge, it affects the output capability of the whole power lithium battery pack.

3. Discretization of cycle life: due to the differences in the service environment and working status of different battery cells, the cycle life varies greatly, and some battery cells may suffer performance attenuation and damage in a short period of time.

II. Factors affecting discretization of dynamic lithium battery pack

1. manufacturing process differences: in the manufacturing process of power lithium battery pack, there may be differences in manufacturing processes such as electrode coating, molding, and packaging, resulting in differences in manufacturing quality of different battery cells, thus, the discrete performance of the battery pack is affected.

2. Use environment difference: power lithium battery pack may be affected by environmental factors such as temperature, humidity, vibration, etc. during actual use, the differences in the use environment of different battery cells may lead to inconsistent performance.

3. Cyclic charge and discharge difference: the difference of charge and discharge cycles and charge and discharge rates of different battery cells may lead to some batteriesThe cycle attenuation speed of the monomer is fast, which affects the discretization performance of the battery pack.

4. Design differences of battery management system (BMS): The design differences of different battery management systems may lead to different management and protection strategies for battery cells, affecting the overall performance and discretization of battery packs.

5. Transportation and Storage differences: power lithium battery pack may be affected by different conditions and environments during transportation and storage, resulting in differences in the status and performance of different battery cells, thus, the discrete performance of the battery pack is affected.

III. Measures to deal with discretization of dynamic lithium battery pack

1. optimize Manufacturing Process: strengthen the control and optimization of power lithium battery pack manufacturing process, improve the consistency and stability of battery cells, and reduce the occurrence of discretization.

2. Improve battery management system: adopt advanced battery management system (BMS) to realize dynamic monitoring and management of battery pack, discover and deal with discrete battery cells in time, ensure the performance stability of the entire system.

3. Strengthen environmental monitoring and control: strengthen the monitoring and control of temperature, humidity, vibration and other factors in the use environment of power lithium battery pack to reduce the impact of environmental factors on the performance of battery cells.

4. Optimizing the cyclic charging and discharging strategy: reasonably design the cyclic charging and discharging strategy to reduce the cyclic attenuation of the battery monomer, prolong the service life of the battery pack and reduce the occurrence of discretization.

The discretization of power lithium battery pack is a complex problem, which is affected by many factors such as manufacturing process, operating environment, cyclic charging and discharging, battery management system, etc. By strengthening manufacturing process control, optimizing battery management system, strengthening environmental monitoring and control and other measures, the occurrence of power lithium battery pack discretization can be effectively reduced, and the stability and reliability of the whole system can be improved.