Is battery assembly just welding the cells together?
Battery pack generally refers to packaging, packaging, and assembly. For example, if two batteries are connected in series to form a specific shape according to customer requirements, we call it pack. In the Pack industry, batteries that are not assembled and can be used directly are often called batteries, and the finished batteries that are connected to the PCM board and have charge and discharge control functions are called batteries.
To assemble a set of lithium batteries, it is not as simple as using lithium batteries in series and parallel connections. You need to look at the power of your electrical load. After calculating the electrical power, you can design the PCM board of the lithium battery. The PCM board can prevent the battery from being overpowered. Charge and over discharge. The PCM board is designed, and then the lithium battery cells are connected in series and parallel according to the capacity of the PCM board. Different output voltages of the lithium battery PCM board have different series connection methods.
So what steps are needed? The specific steps include capacity division, internal resistance detection, and matching. Only those with similar capacity, internal resistance, and voltage can be assembled together. It is best to match and assemble the same brand with the nominal capacity.
1. We use a capacity-dividing cabinet to detect and sort the capacity of lithium batteries, referred to as: capacity-dividing.
A batch of lithium batteries of the same brand and the same nominal capacity have different capacities due to different storage and use times, so it is necessary to measure their capacity. The sub-capacity cabinet is to check the capacity of a batch of lithium batteries through uniform charging and discharging cycles, sort out the same capacity, and pair them when assembling.
2 internal resistance detection
When the lithium battery cell is working, the resistance of the current flowing through the battery is called the internal resistance. This internal resistance can detect the quality of the lithium battery. The higher the internal resistance, the worse the performance of the battery. The lithium battery with similar internal resistance is matched. Together.
Only lithium batteries with similar internal resistance, capacity, and uniform charge and discharge test voltage will be used for pairing and assembly, and then connected to the PCM board for work. Otherwise, the lithium battery pack assembled in random pairs will not have a long life even if it can be used.