Pole lug bending device for polymer lithium ion battery pack

Abstract

A polymer lithium ion battery pack tab bending device comprises lifting air cylinders which are vertically arranged downwards in a bilateral symmetry mode and supports with the sides used for fixing the lifting air cylinders, openings are formed in the opposite sides of the left support and the right support, a horizontal downward pressing rod is fixed to one side of a lifting block, the downward pressing rod penetrates through the openings of the supports, and a square downward pressing block is fixed to the downward pressing rod. The length, the width and the height of the lower pressing block are larger than those of the lower pressing rod body, a U-shaped lower die is fixed between the supports, step stamping structures are arranged on the outer sides of the left top end and the right top end of the lower die respectively, the lower portion of the lower pressing block corresponds to the bottom bent concave portions of the step stamping structures, and a sliding rail horizontally extending outwards is arranged in the middle of the U-shaped lower die. A battery fixing and placing plate is arranged on the sliding rails in a sliding mode, and the battery fixing and placing plate is pushed by an air cylinder to slide along the sliding rails. By means of the lithium battery tab bending device, tabs at the two ends of a lithium battery can be bent at the same time, the consistency of the bending shape and angle is better, and the lithium battery pack can be further assembled and welded conveniently.

Description

Technical Field

[0001] This invention relates to a lithium battery processing apparatus, specifically a polymer lithium-ion battery pack tab bending device. Background Technology

[0002] To meet production demands, polymer lithium-ion battery packs require bending of the tabs before assembly. Bending the tabs shortens the current conduction path within the battery, reduces internal resistance, and improves performance during high-current charging and discharging, while reducing energy loss and heat generation. The bent tab structure is more compact, reducing physical displacement during battery assembly or use, preventing loosening or breakage due to vibration or compression, and improving the overall reliability of the battery pack. The bent tabs also create a tighter contact with the battery's aluminum-plastic film, facilitating better fusion of the insulating film and film during heat sealing and preventing leakage or gas buildup caused by encapsulation defects. The bending design disperses current density, preventing localized overheating and reducing the risk of short circuits caused by burns to the insulation layer during welding or processing, thus lowering the probability of battery swelling or leakage. Furthermore, standardized bending angles and positions facilitate precise operation of mechanical bending equipment, improving production efficiency and consistency, especially suitable for high-speed battery manufacturing processes. Traditional methods mainly involve manual bending using plastic tooling, which is not only difficult to control in terms of bending angle and shape, but also inefficient and not conducive to lithium battery processing. Summary of the Invention

[0003] To address the aforementioned problems, the present invention aims to provide a polymer lithium-ion battery pack tab bending device that can simultaneously bend the tabs at both ends of the lithium battery, and achieves better consistency in bending shape and angle.

[0004] To achieve the above objectives, the technical solution of the present invention is as follows: a polymer lithium-ion battery pack tab bending device, comprising symmetrically arranged vertically downward lifting cylinders and brackets on each side for fixing the lifting cylinders. An opening is provided on one opposite side of the left and right brackets. The lifting cylinders are fixed to the top of the brackets, and a lifting block is fixed to the lower telescopic end within the bracket. A horizontal pressing rod is fixed to one side of the lifting block. The pressing rod passes through the opening of the bracket and is fixed with a square pressing block. The length, width, and height of the pressing block are all greater than the main body of the pressing rod. A U-shaped lower mold is fixed between the brackets, and stepped stamping structures are respectively provided on the outer sides of the left and right top ends of the lower mold. The bottom bending recess of the stepped stamping structure corresponds directly below the pressing block. A horizontally extending slide rail is provided in the middle of the U-shaped lower mold. A battery fixing plate is slidably arranged on the slide rail, and the battery fixing plate is pushed along the slide rail by the cylinder. When the cylinder retracts to its shortest state, the battery fixing plate moves exactly to the middle of the U-shaped lower mold.

[0005] Furthermore, each side bracket is equipped with a vertical guide light rod, and the lifting block slides on the corresponding guide light rod, with the guide light rod located between the lower pressure rod and the lower end of the extension and retraction end of the lifting cylinder on the same side.

[0006] Furthermore, detachable limiting rods are fixed to the front and rear of the battery fixing plate by bolts, and the plate-shaped lithium battery cell is located between the front and rear limiting rods.

[0007] Furthermore, symmetrical arched support plates are fixed on the left and right sides of the battery fixing plate, and the arched support plates extend outward. The outer ends of the arched support plates are covered with an insulating plastic structure, and the middle surface of the insulating plastic structure is provided with a tab placement groove.

[0008] Furthermore, inclined slope structures are respectively provided on the outer side of the stepped stamping structure at the upper ends of both sides of the U-shaped lower die.

[0009] Furthermore, upper step blocks are respectively provided on the opposite side of the stepped stamping structure, and the upper step blocks form the upper part of the stepped stamping structure.

[0010] Furthermore, the battery mounting plate is made of insulating plastic.

[0011] In operation, the lithium battery, which is plate-shaped and has tabs at both ends, is placed on the surface of the battery fixing plate between the limiting rods. The battery fixing plate is pushed by a cylinder to slide along the slide rail. When the cylinder retracts to its shortest state, the battery fixing plate moves to the middle of the U-shaped lower mold. The tabs on each side of the lithium battery are located at the stepped stamping structure. At this time, the lifting cylinders on both sides extend simultaneously, driving the lifting blocks, pressing rods and pressing blocks on each side to move downward. Since the bottom of the pressing block corresponds to the bottom bending recess of the stepped stamping structure, the pressing block bends the tabs downward. The inner side is a right-angle bending structure with the shape of the stepped stamping structure. When an arched support plate is provided, the outer end of the tab is also supported, so the outer side can also be bent, forming a U-shaped bending structure with a flat bottom. After the tabs are bent, the next step of assembly and welding can be carried out. This invention can not only bend the tabs at both ends of the lithium battery at the same time, but also has better consistency in bending shape and angle, which facilitates further assembly and welding of the lithium battery pack. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 This is a top view of the structure of the lower mold for placing the battery according to the present invention; Figure 3 This is a partial structural diagram of the electrode tab of the present invention after bending; Figure 4 This is a physical reference diagram of the present invention. Detailed Implementation

[0013] The technical solution of the present invention will now be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention. In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention 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, and therefore should not be construed as a limitation of the present invention.

[0014] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0015] The following is a detailed description of this embodiment with reference to the accompanying drawings: This embodiment provides a polymer lithium-ion battery pack tab bending device. Please refer to the accompanying drawings in the instruction manual. Figure 1-3 .

[0016] like Figure 1-3 As shown, a polymer lithium-ion battery pack tab bending device includes a lifting cylinder 1 symmetrically arranged vertically downwards and a bracket 2 on each side for fixing the lifting cylinder 1. An opening is provided on the opposite side of the left and right brackets 2. The lifting cylinder 1 is fixed to the top of the bracket 2, and a lifting block 3 is fixed to the telescopic end of the lower end and located inside the bracket 2. A horizontal pressing rod 4 is fixed to one side of the lifting block 3. The pressing rod 4 passes through the opening of the bracket 2 and is fixed with a square pressing block 5. The length, width and height of the pressing block 5 are all greater than the main body of the pressing rod 4. A U-shaped lower mold 6 is fixed between the brackets 2, and a stepped stamping structure 7 is provided on the outer side of the left and right top ends of the lower mold 6. The bottom bending recess of the stepped stamping structure 7 is directly below the pressing block 5. A horizontally extending slide rail 8 is provided in the middle part of the U-shaped lower mold 6. A battery fixing plate 9 is slidably arranged on the slide rail 8, and the battery fixing plate 9 is pushed along the slide rail 8 by the cylinder. When the cylinder retracts to its shortest state, the battery fixing plate 9 moves just to the middle part of the U-shaped lower mold 6.

[0017] To ensure smooth and stable up-and-down sliding of the lifting block 3, vertical guide rods 10 are installed inside each side bracket 2. The lifting block 3 slides on the corresponding guide rod 10, and the guide rod 10 is located between the lower pressure rod 4 and the lower end of the extension and retraction end of the lifting cylinder 1 on the same side. The surface of the guide rod 10 is very smooth, and the inner side of the hole through which the guide rod 10 passes through the lifting block 3 is also smooth, which can effectively ensure the smoothness of lifting.

[0018] To facilitate the positioning of the lithium battery placed on the surface of the battery fixing plate 9, detachable limiting rods 11 are fixed to the front and rear of the surface of the battery fixing plate 9 by bolts, and the plate-shaped lithium battery cell is located between the front and rear limiting rods 11.

[0019] In order to support the tabs at both ends of the lithium battery so that it can be bent into a U-shape, symmetrical arched support plates 12 are fixed on the left and right sides of the battery fixing plate 9, and the arched support plates 12 extend outward. The outer ends of the arched support plates 12 are covered with an insulating plastic structure 13, and the middle surface of the insulating plastic structure 13 is provided with a tab placement groove 14.

[0020] In addition, inclined slope structures 15 are respectively provided on the outer side of the stepped stamping structure 7 at the upper ends of both sides of the U-shaped lower mold 6. Upper step blocks 16 are respectively provided on the opposite side of the stepped stamping structure 7. The upper step blocks 16 form the upper part of the stepped stamping structure 7. The upper step blocks 16 can be fixed by bolts, making it convenient to replace upper step blocks 16 of other thicknesses. The battery fixing and placement plate 9 is made of insulating plastic.

[0021] The working principle of this invention is as follows: A plate-shaped lithium battery with tabs at both ends is placed on the surface of a battery fixing plate 9 between two limiting rods 11. The lithium battery is positioned between the two limiting rods 11, and its width is aligned with the width of the battery fixing plate 9. The battery fixing plate 9 is pushed by a cylinder to slide along a slide rail 8. When the cylinder retracts to its shortest state, the battery fixing plate 9 moves to the middle of the U-shaped lower mold 6. The tabs on each side of the lithium battery are positioned on the stepped stamping structure 7. At this time, the lifting cylinders 1 on both sides extend simultaneously, driving the lifting blocks 3, the pressing rods 4, and the pressing blocks 5 on each side to move downwards. Since the bottom of the pressing block 5 corresponds to the bottom bend and recess of the stepped stamping structure 7, the tabs are bent downwards, and the inner side is a right-angle bend structure in the shape of the stepped stamping structure 7. When an arched support plate 12 is provided, the outer end of the tab is also supported, so the outer side can also be bent, thus forming a U-shaped bend structure with a flat bottom. Figure 3 As shown, after the tab is bent, the next step of assembly and welding can be carried out.

[0022] Of course, the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A polymer lithium-ion battery pack tab bending device, comprising symmetrically arranged vertically downward lifting cylinders (1) and brackets (2) on each side for fixing the lifting cylinders (1), characterized in that: An opening is provided on one side of the left and right brackets (2). The lifting cylinder (1) is fixed on the top of the bracket (2), and the lower telescopic end is fixed with a lifting block (3) located inside the bracket (2). A horizontal pressing rod (4) is fixed on one side of the lifting block (3). The pressing rod (4) passes through the opening of the bracket (2) and is fixed with a square pressing block (5). The length, width and height of the pressing block (5) are all greater than the main body of the pressing rod (4). A U-shaped lower mold (6) is fixed between the brackets (2), and the top left and right ends of the lower mold (6) are fixed with the lower mold (6). The outer side is provided with stepped stamping structure (7), and the bottom of the stepped stamping structure (7) is bent and recessed directly below the lower pressing block (5). The middle part of the U-shaped lower mold (6) is provided with a slide rail (8) extending outward horizontally. A battery fixing plate (9) is slidably provided on the slide rail (8). The battery fixing plate (9) is pushed along the slide rail (8) by a cylinder. When the cylinder retracts to its shortest state, the battery fixing plate (9) moves just to the middle part of the U-shaped lower mold (6).

2. The polymer lithium-ion battery pack tab bending device according to claim 1, characterized in that: Each side bracket (2) has a vertical guide light rod (10) inside. The lifting block (3) slides on the corresponding guide light rod (10), and the guide light rod (10) is located between the lower pressure rod (4) on the same side and the lower end of the extension and retraction end of the lifting cylinder (1).

3. The polymer lithium-ion battery pack tab bending device according to claim 1, characterized in that: The battery mounting plate (9) has detachable limit bars (11) fixed to the front and back of the surface by bolts, and the plate-shaped lithium battery cell is located between the front and back limit bars (11).

4. The polymer lithium-ion battery pack tab bending device according to claim 1, characterized in that: The battery fixing plate (9) is fixed with symmetrical arched support plates (12) on the left and right sides respectively, and the arched support plates (12) extend outward. The outer end of the arched support plate (12) is covered with an insulating plastic structure (13), and the middle surface of the insulating plastic structure (13) is provided with a tab placement groove (14).

5. The polymer lithium-ion battery pack tab bending device according to claim 1, characterized in that: The U-shaped lower die (6) has stepped stamping structures (7) on both sides of the upper end of the stepped structure (7), and inclined slope structures (15) are respectively provided on the outside.

6. The polymer lithium-ion battery pack tab bending device according to claim 1, characterized in that: Upper step blocks (16) are provided on opposite sides of the stepped stamping structure (7), and the upper step blocks (16) form the upper part of the stepped stamping structure (7).

7. The polymer lithium-ion battery pack tab bending device according to claim 1, characterized in that: The battery mounting plate (9) is made of insulating plastic.

Images