Production requirements of lithium battery PACK manufacturers

Lithium battery processing, production requirements of lithium battery PACK manufacturers. The process of assembling lithium battery cells into groups is called PACK, which can be a single battery or a battery module connected in series and parallel. PACK includes battery pack, bus bar, soft connection, protective board, outer packaging, output, highland barley paper, plastic bracket and other auxiliary materials to form PACK.

Lithium battery PACK is divided into structural design, electronic design and production workshops. It can carry out independent development and design according to customer needs. Through battery plans, battery specifications and battery samples, after the customer’s PACK lithium battery customization needs are confirmed, the workshop will The production line carries out production and processing, and the products are shipped after passing the quality inspection.

How to pack lithium battery

Series and parallel composition: The battery is composed of single cells connected in parallel and in series. Parallel connection increases the capacity, but the voltage remains unchanged. After series connection, the voltage doubles, but the capacity remains unchanged.

Parallel first, then series: Parallel connection will affect the cycle life of the lithium battery after parallel connection due to differences in internal resistance and uneven heat dissipation. However, when a single battery fails, it automatically exits. In addition to the capacity reduction, it does not affect its use after parallel connection. The parallel connection process is relatively strict.

Battery core requirements: Select the corresponding battery core according to your own design requirements. Batteries connected in parallel and in series must be of the same type and model, and the difference in capacity, internal resistance, and voltage value should not be greater than 2%.

Under normal circumstances, after the batteries are combined in parallel and series, the capacity loss is 2%-5%. The more batteries, the greater the capacity loss. Whether it is a soft-packed lithium battery or a cylindrical battery, multiple string combinations are required. If the consistency is poor and the capacity of the lithium battery is affected, the battery with the lowest capacity in a group will determine the capacity of the entire battery group.

PACK process: Battery PACK is realized in two ways. One is through laser welding or ultrasonic welding or pulse welding. This is a commonly used welding method. The advantage is that it has better reliability but is not easy to replace.
The second is contact through elastic metal sheets. The advantage is that no welding is required and the lithium battery is easy to replace. The disadvantage is that it may cause poor contact.

Design requirements for lithium battery PACK manufacturers

Fully understand the usage requirements, such as application environment (temperature, humidity, vibration, etc.), usage time, charging and discharging methods and electrical parameters, output mode, life requirements, etc. Select qualified lithium batteries and protective circuit boards according to usage requirements to meet size and weight requirements. The total can be boiled down to the following four points:

1. The packaging is reliable and meets the requirements
2. Simplification of production process
3. Optimize the plan and minimize the cost
4. Subsequent detection is easy to implement

With the improvement of people’s quality of life, the requirements for the shape and performance of various battery-related products are getting higher and higher. Therefore, many lithium battery PACK manufacturers are currently providing some customized services. Customized lithium battery pack services are increasingly popular among people.MK offers battery CUSTOMIZATION to maximize customer needs, details can be viewed by clicking on “Customization”.