Welding process between battery cores

The welding process of lithium batteries is a crucial part of the battery production process. Especially when it comes to the connection of battery tabs, it directly affects the performance and safety of the battery. Therefore, it is crucial to choose the appropriate welding process and method. In the welding process, the most critical point is to ensure that the connection between the welding electrode and the positive and negative electrodes of the battery is firm and reliable. This not only involves the selection and operation of welding equipment, but also requires strict control of welding temperature, time and pressure to ensure that the welding quality meets standard requirements. In addition to welding quality, welding processes also need to consider production efficiency and cost control. Therefore, when selecting a welding process, it is necessary to consider multiple factors to find the most suitable solution. In general, the welding process of lithium batteries is a complex and critical link, and standard operating procedures need to be strictly followed to ensure the quality and safety of the batteries. It is hoped that through continuous technological improvement and process optimization, welding quality can be improved and the development of the lithium battery industry can be promoted.The battery’s capacity characteristics, internal resistance value and open circuit voltage curve are important indicators that reflect the basic performance of the battery, and are also important parameters involved in the design of the battery management system.
The heat production of the battery is related to the current and the internal resistance of the battery. For example, Qg=I²R, Qg is the heat production rate of the battery, 1 is the current flowing through the battery, and R is the total internal resistance of the battery.

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The following are common welding processes:
Resistance Welding:

Resistance welding requires an electrical resistance to heat and melt the part, so it cannot be used for welding conductive materials such as aluminum or copper.New alloys such as SIGMAclad alloys combine resistive and conductive properties and can be used for welding.

Laser Welding:

Laser welding is a fusion welding process that can be used to join different materials.
The new laser breaks through the limitations of traditional laser welding and provides good electrical performance and thermal contact performance.
When choosing laser welding, welding feasibility testing is still required.

Micro TIG Welding:

Micro TIG welding is a fusion welding process suitable for chemically compatible materials.
Copper and steel can be welded, but aluminum and steel cannot be welded.

These welding processes present challenges in different aspects, such as joining between dissimilar materials, welding of thick lugs, production speed, fixture design and process monitoring. Laser welding is fast and attractive, but the right process still needs to be chosen carefully
Laser welding is a joining process that uses a focused laser beam and is used in many industrial fields due to its high precision. In laser welding, a laser beam is focused onto the material surface, causing it to melt and form a welded connection. This process is managed by adjusting the power, speed and focus of the laser beam.

Here are some key points about laser welding:
Advantage:

Fast: Laser welding is fast and suitable for efficient production.
High precision: Laser welding can achieve slender welds and is suitable for high-precision applications.
Non-contact: Laser welding is a non-contact process and does not cause physical damage to the workpiece.
Small thermal deformation: Due to less heat input, laser welding causes less thermal deformation of the workpiece.

Applicable materials:

Laser welding works on a variety of materials, including steel, aluminum and copper.
In battery production, laser welding is also used for copper connections (such as copper-copper and copper-aluminum).
In short, laser welding has wide applicability in high-precision applications and is one of the indispensable processes in modern manufacturing.

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