CN-122029686-A - Electrode assembly, battery cell including the same, and electrode lead welding method

Abstract

The electrode assembly according to the present invention is characterized by comprising a plurality of electrodes having electrode tabs, and electrode leads connected to the electrode tabs, wherein the plurality of electrode tabs comprise a first type of electrode tab and a second type of electrode tab coupled to one surface of the electrode leads and extending farther than the first type of electrode tab.

Inventors

• Wen Zaiyuan
• HONG YIZHEN
• JIANG GUIXIU

Assignees

• 株式会社LG新能源

Dates

Publication Date

20260512

Application Date

20241030

Priority Date

20231101

Claims (14)

1. 1. An electrode assembly, the electrode assembly comprising: A plurality of electrodes having electrode tabs, and An electrode lead coupled to the electrode tab, Wherein the plurality of electrode tabs comprises: A first type electrode tab, and A second type electrode tab coupled to one surface of the electrode lead and formed to extend longer than the first type electrode tab.
2. 2. The electrode assembly according to claim 1, Wherein the second type electrode tab is coupled to at least one of two surfaces of the electrode lead.
3. 3. The electrode assembly according to claim 1, Wherein each of the first type electrode tab and the second type electrode tab includes: a pair of metal layers disposed at the outermost sides, and And a non-metal layer disposed between the pair of metal layers.
4. 4. An electrode assembly according to claim 3, Wherein the pair of metal layers are deposited on both surfaces of the nonmetallic layer.
5. 5. An electrode assembly according to claim 3, Wherein the non-metallic layer comprises a polymer, and The metal layer comprises aluminum.
6. 6. The electrode assembly according to claim 1, Wherein the electrode lead is coupled to the electrode tab at the center of the electrode in the thickness direction.
7. 7. The electrode assembly according to claim 6, Wherein the second type electrode tabs are arranged in a pair, and The pair of second-type electrode tabs are coupled to one side and the other side of the electrode lead, respectively.
8. 8. The electrode assembly according to claim 7, Wherein the pair of second-type electrode tabs are coupled to two opposite side surfaces of the electrode lead, respectively.
9. 9. The electrode assembly according to claim 6, Wherein the same number of electrode tabs are provided in the upper surface direction and the lower surface direction of the electrode leads based on the electrode leads.
10. 10. The electrode assembly according to claim 1, Wherein the electrode lead and the second type electrode tab are coupled by welding.
11. 11. The electrode assembly according to claim 1, Wherein the first type electrode tabs are configured in plurality, and The plurality of first type electrode tabs all have the same length.
12. 12. The electrode assembly according to claim 1, Wherein the plurality of electrode tabs are stacked in one direction.
13. 13. A battery cell, the battery cell comprising: Electrode assembly, and A battery case in which an electrode assembly is received, Wherein the electrode assembly includes: A plurality of electrodes having electrode tabs, and An electrode lead coupled to the electrode tab, Wherein the plurality of electrode tabs comprises: A first type electrode tab, and A second type electrode tab coupled to one surface of the electrode lead and formed to extend longer than the first type electrode tab.
14. 14. An electrode lead welding method for welding an electrode tab and an electrode lead, the electrode lead welding method comprising the steps of: a step of disposing the electrode leads at the positions where the electrode tabs are located, and A step of welding the electrode tabs and the electrode leads, Wherein, the electrode joint includes: A first type electrode tab, and A second type electrode tab coupled to one surface of the electrode lead and formed to extend longer than the first type electrode tab, Wherein, in the step of disposing the electrode leads, The electrode lead is arranged at the position of the second type electrode joint.

Description

Electrode assembly, battery cell including the same, and electrode lead welding method Technical Field Cross-reference to related applications The present application claims priority from korean patent application No. 10-2023-0149501, filed on korea at 1 of 11/2023, and korean patent application No. 10-2024-0148952, filed on korea at 28/2024, the disclosures of which are incorporated herein by reference. Technical Field The present disclosure relates to an electrode assembly, a battery cell including the same, and an electrode lead welding method. Background Recently, depletion of fossil fuels has forced the price of energy to rise, and has also had a great influence on environmental pollution problems that people are increasingly focusing on, and the demand for environmentally friendly alternative energy is an important factor for future life. In this context, various energy generation technologies including solar energy, wind energy, tidal energy, etc. are being studied, and attention is being turned to energy storage systems such as batteries to more effectively utilize the generated electric energy. In addition, as technology advances and demand for electronic mobile devices and electric vehicles using batteries increases, demand for batteries as energy sources also increases rapidly, and thus, many researches on batteries satisfying various demands are being conducted. Batteries are receiving increasing attention as an energy source in various products including mobile devices and electric vehicles. In particular, secondary batteries are regarded as a promising energy source that can replace existing products using fossil fuels and do not generate byproducts of energy use, so they are attracting attention as an environmental energy source. Meanwhile, secondary batteries have attracted attention as energy sources for Electric Vehicles (EVs), hybrid Electric Vehicles (HEVs), and plug-in-HEVs, which are known as solutions for reducing air pollution of existing vehicles using fossil fuels, such as gasoline vehicles and diesel vehicles. That is, the secondary battery is used in the form of a battery pack including a plurality of battery modules. The secondary battery includes a positive electrode and a negative electrode stacked with a separator therebetween to form an electrode assembly. At this time, electrode tabs are formed on each of the positive and negative electrodes, and since they are formed on each of the plurality of positive and negative electrodes, a plurality of electrode tabs are also formed. The plurality of electrode tabs are electrically coupled to the electrode leads. Traditionally, the electrode tabs are made of metal. Recently, electrode tabs have begun to be made of materials other than metal alone. A typical example is a longer extension, in which the metal is deposited on a non-metallic material, in particular a polymer layer. There are difficulties in welding the electrode lead and the electrode tab when the electrode tab includes a longer extension of the metal layer deposited on the non-metal layer. Conventionally, a method of welding electrode tabs together first and then adding an electrode lead for welding is used, but when this method is applied to a longer extension, there is a problem that the welding effect is not good, or even if welding is performed, the target fusion strength or partial peeling cannot be achieved. Disclosure of Invention Technical problem The present disclosure is directed to solving the problems of the related art, and therefore, the present disclosure is directed to providing an electrode assembly, a battery cell including the same, and an electrode lead welding method, which can easily determine a portion of an electrode lead welded to an electrode tab by including the electrode tab formed to extend longer than other electrode tabs, so that a position where the electrode lead is disposed can be easily determined when welding is performed with the electrode lead disposed between the electrode tabs. Technical proposal An electrode assembly according to one aspect of the present disclosure may include a plurality of electrodes having electrode tabs, and an electrode lead coupled to the electrode tabs, wherein the plurality of electrode tabs include a first type electrode tab, and a second type electrode tab coupled to one surface of the electrode lead and formed to extend longer than the first type electrode tab. The second type electrode tab may be coupled to at least one of two surfaces of the electrode lead. Each of the first type electrode tab and the second type electrode tab may include a pair of metal layers disposed at outermost sides, and a non-metal layer disposed between the pair of metal layers. The pair of metal layers are deposited on both surfaces of the nonmetallic layer. The non-metallic layer may comprise a polymer and the metallic layer may comprise aluminum. The electrode lead may be coupled to the electrode tab at the center of the