What are the classifications of tab terminals for soft-pack lithium-ion batteries?

Classification of Tab Terminals for Soft-Pack Lithium-Ion Batteries

I. Introduction

The current collectors of pouch-type lithium-ion batteries are an essential component of the battery. They connect the active materials inside the battery to the external circuit, playing a crucial role in current transmission. Depending on different application requirements and characteristics, the current collectors of pouch-type lithium-ion batteries can be categorized into several types.

II. Classification

1. Classified by material

(1) Nickel tab: Suitable for certain high-nickel batteries, featuring excellent conductivity and corrosion resistance.

(2) Copper tab: Widely used in most pouch-type lithium-ion batteries, it features excellent electrical conductivity and processability.

(3) Aluminum tab: Primarily used in batteries with special requirements, such as applications that demand lightweight designs.

2. Classified by structure

(1) Single-tab electrode: Simple structure, suitable for small batteries or specific application scenarios.

(2) Multi-tab electrodes: Composed of multiple tabs, suitable for large-scale batteries or applications requiring higher current-carrying capacity.

3. Classified by Function

(1) Positive terminal tab: Connects to the positive electrode of the battery and is responsible for transmitting positive charges.

(2) Negative terminal tab: Connects to the negative electrode of the battery and is responsible for transmitting negative charges.

(3) Hybrid current collectors: These simultaneously serve the functions of both positive and negative electrodes and are suitable for batteries with certain special structures.

4. Classified by process

(1) Welded tab: Connected to the battery via welding, offering high connection strength.

(2) Pressure-contact tab: This contact method uses pressure to make contact with the battery and is suitable for certain special application scenarios.

III. Summary and Application

Different types of tab terminals for soft-pack lithium-ion batteries have distinct characteristics and application scenarios. When selecting tab terminals, it’s essential to take into account a variety of factors, including the battery type, application requirements, and operating environment. For example, tab terminals with high electrical conductivity and corrosion resistance are suitable for batteries that operate at high currents and high power levels; whereas lightweight, specially designed tab terminals are better suited for specific application needs. In short, choosing and using the right tab terminals for soft-pack lithium-ion batteries is crucial for ensuring both the performance and safety of the battery.

IV. Recommendations and Outlook

It is recommended that when selecting tab terminals for pouch-type lithium-ion batteries, you should carefully consider the battery’s actual conditions and application requirements. With advances in technology, more new materials and new manufacturing processes for tab terminals are likely to emerge in the future, opening up even greater possibilities for enhancing the performance and reducing the costs of pouch-type lithium-ion batteries.