I. Analysis of the nature of the electric core

Before using power and digital batteries in parallel, the two types of batteries need to be analyzed to find out their advantages and disadvantages.

Power battery cell: It is suitable for high-capacity and high-power electrical appliances, such as power tools and electric vehicles. It has high energy density, high discharge performance, and can be discharged with high current.

Digital battery cell: Suitable for low power electronic equipment, such as digital camera, mobile power, etc.. It has low internal resistance and smoother discharge characteristics.

II. Capacity Matching and Internal Resistance Matching

1. Capacity matching

Before using the battery cells in parallel, it is necessary to consider whether the capacities of the battery cells are equal. If there is a big difference between the capacities of two batteries, it will lead to the smaller capacity battery being over-discharged while the larger capacity battery is charged when the two batteries are working in parallel. As a result, the smaller-capacity battery cell is prone to safety hazards, while the larger-capacity battery cell is likely to be overcharged, thus reducing its lifespan or losing its use value.

Therefore, in the parallel use of battery cells, we need to make sure that the capacity of the two is equal or the difference is not too big, which can ensure that the battery cells can bear approximately equal amount of charge when working in parallel, and at the same time, can reduce the phenomenon of over-discharging and over-charging.

2. Internal resistance matching

In addition to capacity matching, we also need to consider whether the internal resistance of the battery cell is consistent. The internal resistance of the battery cell is affected by the quality of the battery cell, the number of battery cell stages, the temperature of the battery cell and other factors. If the internal resistance of the battery cells is different, it will easily lead to inconsistent discharge efficiency when the battery cells are working in parallel. When the internal resistance of one battery cell is larger than the other, that battery cell will be charged in priority. At this point, the working condition of this piece of battery cell will become unstable and may be over-discharged and so on.

For this reason, it is important to choose a cell with a similar internal resistance or to unify the internal resistance of the cells by adding a resistor. This method is more cumbersome but can effectively improve the working efficiency of the battery cell, to ensure the long-term use of the battery cell.

III. Security issues

1. Selection of appropriate battery management protection module

The parallel use of battery cells requires the selection of a suitable battery management and protection module. Battery management protection module can control the current, voltage and other parameters of the battery cell to prevent the battery cell from over-charging, over-discharging, over-temperature, short-circuit and other conditions that may cause safety hazards.

2. Safe line connection

The safety of line connection is also one of the key issues for parallel connection of battery cells. When connecting the wires, we need to make sure that the connection is good, and avoid using too long or too tight wires as much as possible. Moreover, care should be taken to avoid mutual interference, friction, collision, etc. between the line and other items to prevent the line from short-circuiting.

IV. Summary

Through the above analysis, we can draw the following conclusions:

1. When power and digital batteries are used in parallel, it is necessary to try to choose batteries with similar capacity, or match the capacity of the batteries by adding resistors.

2. For batteries with different internal resistance, the internal resistance value should be unified. 3.

3. When cells are used in parallel, it is necessary to choose the appropriate battery management and protection module, as well as safe and reliable wiring connections.

If the above issues can be fully considered, power cells and digital cells can be used in parallel to play a better role and bring more convenience to our lives.