Lithium battery tab welding tool

Abstract

The utility model discloses a lithium battery pole lug welding frock for the welding of two roll core pole lugs and connecting pieces in square lithium battery, including through detachable connection's lower holder and upper holder, the upper end surface of lower holder is equipped with the corresponding material groove I of roll core pole lug position, the protective piece is placed in material groove I, the roll core pole lug is laid on the protective piece, be equipped with the corresponding material groove II of material groove I position on upper holder, the connecting piece is used for placing in material groove II. Thus, through material groove I on lower holder to the positioning of protective piece, then the roll core pole lug is laid on the protective piece, again through material groove II on upper holder to the positioning of connecting piece, ensure the accuracy of material placement position when welding, effectively avoid the misplacement of welding, thereby improved the welding quality and production efficiency of product, simple structure, and the function of each component is clear, and the replacement operation is convenient and quick.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery production equipment technology, and in particular to a lithium battery tab welding fixture. Background Technology

[0002] Lithium-ion batteries are widely used in many fields due to their advantages such as being environmentally friendly and having high energy density. Common types of lithium-ion batteries include pouch batteries, prismatic aluminum-cased batteries, and cylindrical batteries. In the production of prismatic aluminum-cased batteries, copper or aluminum foil is typically used as the current collector. The foil is laser-cut to form tabs, and then ultrasonically welded to connect two coiled cores in parallel. During the welding process, connecting tabs are generally used to connect the tabs of the two coiled cores in parallel. The core function of the connecting tabs is to connect the tabs of the two coiled cores in parallel through welding. This electrical connection allows each coiled core to form a stable current path inside the battery, enabling the battery to charge and discharge normally, ensuring the electrical performance of the lithium battery, and guaranteeing a stable output of electrical energy during operation.

[0003] However, the existing welding process lacks effective welding auxiliary tooling, and most of the welding is done manually by aligning the connecting piece with the tab. During welding, problems such as the tab or connecting piece being misaligned or poor welding are easy to occur, which can directly lead to damage to lithium batteries or product scrap, and the production efficiency is low.

[0004] Therefore, there is an urgent need for a simple and fully functional auxiliary tooling to solve the above-mentioned problems in the welding process of square lithium battery tabs. Utility Model Content

[0005] To address the technical problems existing in the background art, this utility model proposes a welding fixture for lithium battery tabs.

[0006] This utility model proposes a lithium battery tab welding fixture for welding two core tabs and connecting pieces inside a square lithium battery. It includes a lower retainer and an upper retainer that are detachably connected. The upper end face of the lower retainer is provided with a material groove I corresponding to the position of the core tab. A protective sheet is placed in the material groove I, and the core tab is laid flat on the protective sheet. The upper retainer is provided with a material groove II corresponding to the position of the material groove I. The material groove II is used to place the connecting piece.

[0007] This ensures the accuracy of material placement during welding, effectively preventing welding misalignment and thus improving product welding quality and production efficiency; the structure is simple, the functions of each component are clearly defined, and replacement operations are convenient and quick.

[0008] Preferably, baffles are provided on both sides of the upper retainer at the corresponding positions of the material trough II.

[0009] This prevents welding slag from splashing, avoids secondary contamination of the core by welding slag during the welding process, ensures product quality, and reduces the defect rate caused by contamination.

[0010] Preferably, the material trough I is further provided with positioning pins for fixing the protective sheet.

[0011] This ensures the accuracy of the protective sheet's position and avoids the problem of the protective sheet shifting or shaking within the material trough I, providing a stable base for placing the core tabs.

[0012] Preferably, the lower retainer and the upper retainer are made of metal.

[0013] Thus, it has strong resistance to deformation, good heat dissipation, high temperature resistance, and can be used for magnetic positioning.

[0014] Preferably, the lower retainer is provided with:

[0015] The positioning pin engages with the positioning hole provided on the upper retainer for positioning;

[0016] The embedded magnet can be tightly attracted and adhered to the upper retainer.

[0017] This facilitates quick assembly and disassembly of the upper and lower retainers, improving work efficiency.

[0018] Preferably, the surface of the embedded magnet is coated with a layer of 304 stainless steel.

[0019] In this way, magnetic materials such as neodymium iron boron are physically isolated from the internal environment of the battery, avoiding the contamination of electrode materials by microparticles generated by the wear of magnets during long-term vibration; it can also resist electrolyte corrosion; and improve the compressive strength of the magnets to prevent brittle fracture when the tooling is closed.

[0020] Preferably, the lower retainer is further provided with an embedded fixing screw, which is used for a secure connection between the lower retainer and other components.

[0021] This makes it easy to connect with other components.

[0022] Preferably, the baffle is made of alumina ceramic material with a thickness of 2-3 mm.

[0023] Thus, it can withstand instantaneous high temperatures and effectively block molten metal splashes; the 2-3mm thick ceramic attenuates ultrasonic waves by only 3-5dB, ensuring effective energy transfer of the welding head; it can also withstand the corrosion of electrolytes and organic solvents.

[0024] In summary, this utility model has the following beneficial effects: the protective sheet is positioned by the material groove I on the lower retainer, and then the core electrode is laid flat on the protective sheet. The connecting piece is then positioned by the material groove II on the upper retainer, which ensures the accuracy of the material placement during welding, effectively avoids welding misalignment, and thus improves the welding quality and production efficiency of the product; the structure is simple, the functions of each component are clear, and the replacement operation is convenient and quick.

[0025] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the lower cage structure according to an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the upper retainer structure according to an embodiment of the present utility model;

[0028] Figure 3 This is a schematic diagram showing the arrangement of the core lugs and the tooling before welding in an embodiment of this utility model.

[0029] In the picture:

[0030] 1. Electrode; 2. Lower retainer; 21. Material trough I; 211. Positioning pin; 22. Positioning pin; 23. Embedded magnet; 24. Embedded fixing screw; 3. Upper retainer; 31. Material trough II; 32. Baffle; 4. Protective plate; 5. Connecting plate; 6. Ultrasonic welding head; 7. Ultrasonic welding base. Detailed Implementation

[0031] The embodiments of this utility model are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0032] like Figure 1-3 As shown in the figure, this embodiment proposes a lithium battery tab welding fixture for welding two core tabs 1 and connecting pieces 5 inside a square lithium battery. It includes a lower retainer 2 and an upper retainer 3 that are detachably connected. The upper end face of the lower retainer 2 is provided with a material groove I 21 corresponding to the position of the core tab 1. A protective piece 4 is placed in the material groove I 21 and the core tab 1 is laid flat on the protective piece 4. The upper retainer 3 is provided with a material groove II 31 corresponding to the position of the material groove I 21. The connecting piece 5 is placed in the material groove II 31.

[0033] In this way, the protective sheet 4 is positioned by the material groove I21 on the lower retainer 2, and then the core electrode 1 is laid flat on the protective sheet 4. The connecting piece 5 is then positioned by the material groove II31 on the upper retainer 3, which ensures the accuracy of the material placement during welding, effectively avoids welding misalignment, and thus improves the welding quality and production efficiency of the product. The structure is simple, the functions of each component are clear, and the replacement operation is convenient and quick.

[0034] Furthermore, such as Figure 1 As shown, the material groove I21 is also equipped with positioning pins 211 for fixing the protective sheet 4, ensuring the accuracy of the position of the protective sheet 4 and avoiding the problem of the protective sheet 4 shifting or shaking in the material groove I21. This provides a stable placement base for the core electrode tab 1. The core electrode tab 1 is laid flat on top of the protective sheet 4. With the positioning effect of the protective sheet 4, the accuracy of the position of the electrode tab 1 during welding can be further ensured, and it can accurately correspond with the connecting piece 5, thereby improving the welding quality.

[0035] During the welding process of tab 1, the protective sheet 4 is positioned between the core tab 1 and the ultrasonic welding head 6, which prevents the ultrasonic welding head 6 from directly contacting the core tab 1. This prevents damage to tab 1 caused by high temperature and high energy during welding, avoids problems such as deformation and melting of tab 1, and thus ensures the structural integrity and conductivity of tab 1, ensuring the stable electrical performance of the battery.

[0036] Meanwhile, the protective sheet 4 can also block contaminants such as welding slag and debris generated during the welding process to a certain extent, preventing them from falling directly onto the core, thus playing an isolation role, preventing the core from being contaminated, ensuring the cleanliness of the lithium battery interior, and improving product quality.

[0037] Furthermore, the lower retainer 2 and the upper retainer 3 are made of metal, specifically iron. This provides advantages such as strong resistance to deformation, good heat dissipation, high temperature resistance, and the ability to be positioned magnetically.

[0038] Preferably, the lower retainer 2 is provided with:

[0039] The positioning pin 22 engages with the positioning hole provided on the upper retainer 3 for positioning; it is used to achieve precise alignment between the lower retainer 2 and the upper retainer 3 and prevent misalignment or displacement between the two.

[0040] The embedded magnet 23 can be tightly attracted and adhered to the upper retainer 3, ensuring that the lower retainer 2 and the upper retainer 3 are tightly adhered to each other.

[0041] The lower retainer 2 is also provided with an embedded fixing screw 24, which is used for the secure connection between the lower retainer 2 and other components.

[0042] It should be noted that the surface of the embedded magnet 23 is covered with a layer of 304 stainless steel. This physically isolates the magnetic materials such as neodymium iron boron from the internal environment of the battery, preventing microparticles from contaminating the electrode materials due to wear and tear of the magnet during long-term vibration; it also resists electrolyte corrosion; and it improves the compressive strength of the magnet, preventing brittle fracture during tooling mold closing.

[0043] In the preferred embodiment of this example, such as Figure 2 As shown, baffles 32 are provided on both sides of the upper retainer 3 and the corresponding position of the material trough II 31. When the electrode lug 1 is welded, it can block the welding slag from splashing, avoid the welding slag from causing secondary pollution to the core during the welding process, ensure the quality of the product, and reduce the defect rate caused by pollution.

[0044] Specifically, the baffle 32 is made of alumina ceramic with a thickness of 2-3mm. Alumina ceramic can withstand instantaneous high temperatures of 1200℃ (ultrasonic welding point temperature is about 800℃), which, compared to the traditional stainless steel baffle 32 (melting point about 1400℃ but prone to heat deformation), can effectively block molten metal splashing; the 2-3mm thick ceramic attenuates ultrasonic waves (commonly 20kHz) by only 3-5dB, ensuring effective energy transfer of the welding head; it can also withstand the corrosion of electrolyte (LiPF6) and organic solvent (NMP).

[0045] In summary, during use, first place the protective sheet 4 in the material trough I 21 and position it using the positioning pin 211; then lay the core tab 1 flat on top of the protective sheet 4; subsequently, place the upper retainer 3 on top of the lower retainer 2, and achieve accurate alignment between the two using the positioning pin 22, and use the embedded magnet 23 to make them fit tightly; finally, place the connecting piece 5 in the material trough II 31 of the upper retainer 3. After the material placement is completed, the fixture is transferred to the welding station for welding operations.

[0046] It should be noted that when the fixture arrives at the welding station, the fixture tray is lifted so that the uppermost connecting piece 5 contacts the ultrasonic welding base 7. Then, the ultrasonic welding head 6 is lifted upward and contacts the protective piece 4 before ultrasonic welding begins. After welding is completed, the ultrasonic welding head 6 and the ultrasonic welding base 7 are separated, and the fixture tray is transferred again to move the welded battery to the next process, thus completing the entire welding process.

[0047] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0048] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0049] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0050] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0051] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A lithium battery tab welding fixture for welding two core tabs and connecting pieces inside a square lithium battery, characterized in that, The device includes a lower retainer and an upper retainer that are detachably connected. The upper end face of the lower retainer is provided with a groove I corresponding to the position of the core tab. A protective sheet is placed in the groove I, and the core tab is laid flat on the protective sheet. The upper retainer is provided with a groove II corresponding to the position of the groove I. The groove II is used to place the connecting piece.

2. The lithium battery tab welding fixture according to claim 1, characterized in that, Both sides of the upper retainer and the corresponding position of the material trough II are provided with baffles.

3. The lithium battery tab welding fixture according to claim 1, characterized in that, The material trough I is also equipped with positioning pins for fixing the protective sheet.

4. The lithium battery tab welding fixture according to claim 1, characterized in that, The lower and upper cages are made of metal.

5. The lithium battery tab welding fixture according to claim 4, characterized in that, The lower retainer is provided with: The positioning pin engages with the positioning hole provided on the upper retainer for positioning; The embedded magnet can be tightly attracted and adhered to the upper retainer.

6. The lithium battery tab welding fixture according to claim 5, characterized in that, The embedded magnet has a surface covered with a 304 stainless steel layer.

7. The lithium battery tab welding fixture according to claim 5, characterized in that, The lower retainer is also provided with embedded fixing screws, which are used for the secure connection of the lower retainer to other components.

8. The lithium battery tab welding fixture according to claim 2, characterized in that, The baffle is made of alumina ceramic with a thickness of 2-3mm.

Images