Laminated cell ultrasonic welding device

Abstract

The utility model relates to the technical field of battery cell packaging, in particular to a laminated battery cell ultrasonic welding device which comprises a base used for placing battery cell laminations to be welded; the welding mechanism is arranged opposite to the base and comprises an ultrasonic welding head and a welding driving part used for driving the ultrasonic welding head to be close to or away from the base; wherein the base is provided with a limiting structure used for placing a battery core lamination, the limiting structure is also internally provided with a welding salient point which is arranged in a protruding manner, and the welding salient point corresponds to the welding position of the battery core lamination; and the ultrasonic welding head is configured to perform ultrasonic welding on the battery core lamination pressed between the ultrasonic welding head and the welding salient points at set frequency and amplitude. According to the utility model, the limiting structure is arranged on the base, so that the placement precision of the battery core lamination is more accurate, and the welding precision is improved; and the welding salient points are arranged on the base, so that the same welding effect is achieved under the condition of energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of battery cell packaging technology, and in particular to an ultrasonic welding device for stacked battery cells. Background Technology

[0002] In the production process of nickel-metal hydride batteries, the stacked structure of the battery cells is one of the core components. The stacked cells are typically composed of alternating positive electrode plates, negative electrode plates, and separators, which are connected into a complete battery unit using high-precision welding technology.

[0003] In existing technologies, laser welding is often used to weld battery cells. Laser welding refers to welding the parts to be welded using a high-energy laser beam. However, for stacked battery cells with separators and positive and negative electrodes, the positional accuracy of the positive and negative electrodes and separators is very high during welding. The separator needs to completely cover the positive and negative electrodes, which poses a risk of excessive powder shedding from the positive electrode and short circuits due to electrode misalignment. Utility Model Content

[0004] In view of at least one of the above technical problems, the present invention provides an ultrasonic welding device for laminated battery cells, which adopts structural improvements to improve welding accuracy and efficiency.

[0005] According to a first aspect of the present invention, an ultrasonic welding device for laminated battery cells is provided, comprising:

[0006] A base for placing the stack of battery cells to be welded;

[0007] A welding mechanism, disposed opposite to the base, includes an ultrasonic welding head and a welding drive component for driving the ultrasonic welding head toward or away from the base;

[0008] The base has a limiting structure for placing battery cell stacks, and the limiting structure also has raised welding protrusions. The welding protrusions correspond to the welding positions of the battery cell stacks. The ultrasonic welding head is configured to perform ultrasonic welding on the battery cell stacks pressed between the ultrasonic welding head and the welding protrusions at a set frequency and amplitude.

[0009] In some embodiments of this utility model, the welding bumps are raised structures distributed along the welding path of the battery cell stack.

[0010] In some embodiments of this utility model, the welding bumps are evenly distributed along the welding path of the cell stack, and at least one row is provided.

[0011] In some embodiments of this utility model, the limiting structure is a limiting post with a protrusion.

[0012] In some embodiments of this utility model, the welding structure further includes a gantry frame, and the ultrasonic welding head and the welding drive component are movable relative to each other on the gantry frame.

[0013] In some embodiments of this utility model, the gantry frame has a slide rail, and the ultrasonic welding head and the welding drive are slidably connected to the slide rail.

[0014] In some embodiments of this utility model, the gantry frame also has a transverse drive for driving the ultrasonic welding head and the welding drive component to move along the slide rail.

[0015] In some embodiments of this utility model, at least two bases are provided within the range of the gantry frame;

[0016] It also includes a loading and unloading drive assembly for driving each of the bases into or out of the gantry.

[0017] In some embodiments of this utility model, the loading and unloading drive assembly includes a track for sliding the base, and also includes a motor lead screw structure connected to the base.

[0018] In some embodiments of this utility model, a pressure plate is rotatably connected to the edge of the base. The pressure plate can be flipped to cover the surface of the base for pressing the non-welded parts of the battery cell stack.

[0019] The beneficial effects of this utility model are as follows: the limiting structure set on the base enables more precise placement of the battery cell stacks, thus improving welding accuracy; and the welding protrusions set on the base enable point-to-point contact between the welding protrusions and the ultrasonic welding head during welding, achieving the same welding effect with lower energy consumption. Compared with existing laser welding, this utility model has higher welding efficiency and higher weld strength consistency. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the ultrasonic welding device for laminated battery cells in an embodiment of this utility model;

[0022] Figure 2 This is a schematic diagram of the exploded disassembly structure of the base on which the battery cell stack is placed in an embodiment of this utility model;

[0023] Figure 3 As an embodiment of this utility model Figure 2 A magnified schematic diagram of the structure at point A in the diagram;

[0024] Figure 4 This is a schematic diagram of the welding mechanism in an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the connection structure between the base and the loading / unloading drive assembly in an embodiment of this utility model;

[0026] Figure 6 This is a schematic diagram of the structure of the pressure plate on the base pressing the stacked battery cells in an embodiment of this utility model.

[0027] Explanation of reference numerals in the attached drawings: 1. Base; 11. Limiting structure; 12. Welding protrusion; 13. Pressure plate; 2. Welding mechanism; 21. Ultrasonic welding head; 22. Welding drive component; 23. Gantry frame; 24. Slide rail; 25. Horizontal movement drive component; 3. Loading and unloading drive assembly; 31. Track; 32. Motor lead screw structure. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0029] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0031] like Figures 1 to 6 The ultrasonic welding device for laminated battery cells shown includes a base 1 and a welding mechanism 2, as detailed below. Figure 1As shown, the base 1 is used to place the battery cell stacks to be welded; the welding mechanism 2 is arranged opposite to the base 1, including an ultrasonic welding head 21 and a welding drive component 22 for driving the ultrasonic welding head 21 closer to or away from the base 1; as shown Figure 2 and Figure 3 As shown, the base 1 has a limiting structure 11 for placing the battery cell stack. The limiting structure 11 also has a raised welding protrusion 12. The welding protrusion 12 corresponds to the welding position of the battery cell stack. The ultrasonic welding head 21 is configured to perform ultrasonic welding on the battery cell stack pressed between the ultrasonic welding head 21 and the welding protrusion 12 at a set frequency and amplitude.

[0032] In the above embodiments, the basic principle of ultrasonic welding is to convert high-frequency electrical energy into mechanical vibration energy. This vibration energy is concentrated in the welding area, causing the material to be locally heated, plasticized, or melted under high-frequency vibration, thereby achieving the bonding of the workpiece. In the embodiments of this utility model, the ultrasonic welding head 21 presses the entire battery cell stack into the area enclosed by the limiting structure 11, and the ultrasonic welding head 21 and the welding protrusions 12 can achieve point-to-point contact. Thus, during the high-frequency vibration, the material is welded according to the distribution of the welding protrusions 12. Through actual calculation, since the ultrasonic welding head 21 in this utility model covers the entire battery cell stack, it can achieve one-time welding of multiple welding protrusions 12. By comparison, compared with the existing laser welding, the welding efficiency is increased by 50%, and the welding yield reaches 99%. Through actual measurement, the above-mentioned point-to-point welding achieves the same welding quality with lower energy consumption, the welding tensile force is greater than 25 N / m, and in specific welding, no less than four layers of diaphragms can be welded.

[0033] Based on the above embodiments, please refer to Figure 3 In this embodiment of the invention, the welding bumps 12 are raised structures distributed along the welding path of the battery cell lamination. It should be noted that the welding bumps 12 can have various structural forms, such as cylindrical or rectangular bumps. The shape of the bumps determines the final weld shape. This point-to-point welding method reduces the welding area compared to the existing single weld seam, thus effectively reducing energy consumption. Furthermore, in this embodiment, the welding bumps 12 are evenly distributed along the welding path of the battery cell lamination and are arranged in at least one row. In another embodiment, the welding bumps 12 are arranged in three rows, staggered, which further improves the welding quality.

[0034] Optionally, in embodiments of this utility model, the limiting structure 11 has various forms. In some embodiments of this utility model, such as... Figure 3As shown, the limiting structure 11 is a protruding limiting post. Please refer to... Figure 2 and Figure 3 The limiting posts are arranged according to the contour of the battery cell stack, which ensures the reliability of placement when placing multi-layer stacked structures.

[0035] In embodiments of this utility model, in order to adjust the welding position, such as Figure 1 and Figure 4 As shown, the welding structure also includes a gantry 23, on which the ultrasonic welding head 21 and the welding drive component 22 are relatively movable. This relative movement can take various forms; for example, it can be achieved through manual adjustment, or the position of the ultrasonic welding head 21 can be adjusted electrically.

[0036] In embodiments of this utility model, to reduce resistance during the above-mentioned adjustment process, please continue to refer to... Figure 4 The gantry frame 23 has a slide rail 24, and the ultrasonic welding head 21 and welding drive component 22 are slidably connected to the slide rail 24. Specifically, a bracket can be set to fix the ultrasonic welding head 21 and welding drive component 22 together, and then a slider can be connected to the bracket, with the slider slidably connected to the slide rail 24. In embodiments of this utility model, the gantry frame 23 also has a transverse drive component 25 for driving the ultrasonic welding head 21 and welding drive component 22 to move along the slide rail 24. In some embodiments of this utility model, the transverse drive component 25 can be driven by a motor, a lead screw, and a nut seat; the welding drive component 22 can be driven by a cylinder to achieve downward pressure.

[0037] Please continue to refer to Figure 1 To further improve welding efficiency, at least two bases 1 are provided within the range of the gantry 23; it also includes a loading / unloading drive assembly 3 for driving each base 1 into or out of the gantry 23. During welding operations, the loading / unloading drive assembly can ensure that one of the two bases 1 is always in a welding state, while the other is unloaded and the stacked cells are placed. After the cell stacked cells on the other base 1 are welded, the base 1 with the stacked cells placed is moved to the bottom of the gantry 23 for the next pressing. This setup allows for uninterrupted welding, thereby further improving welding efficiency.

[0038] For details regarding the structure of the loading / unloading drive component 3, please refer to [link / reference needed]. Figure 5 The loading / unloading drive assembly 3 includes a track 31 for sliding the base 1, and a motor screw structure 32 connected to the base 1. The motor screw structure 32 is prior art and will not be described in detail here. The motor screw structure 32 further improves control precision.

[0039] Please refer to Figure 2 and Figure 6 To further ensure that the battery cell stack does not shift during movement, in this embodiment of the invention, a pressure plate 13 is rotatably connected to the edge of the base 1. The pressure plate 13 can be flipped to press against the surface of the base 1, and is used to hold the non-welded parts of the battery cell stack. Figure 2 As shown, before placing the stacked sheets, the pressure plate 13 is in a vertical position, as... Figure 6 As shown, after the stacked pieces are placed, the pressure plate 13 is rotated 90 degrees and pressed onto the upper surface of the base 1 to hold the stacked pieces in place, thereby preventing movement during the movement of the base 1, further improving the placement accuracy, and thus improving the accuracy of subsequent welding.

[0040] Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An ultrasonic welding device for laminated battery cells, characterized in that, include: A base for placing the stack of battery cells to be welded; A welding mechanism, disposed opposite to the base, includes an ultrasonic welding head and a welding drive component for driving the ultrasonic welding head closer to or away from the base; The base has a limiting structure for placing battery cell stacks, and the limiting structure also has raised welding protrusions. The welding protrusions correspond to the welding positions of the battery cell stacks. The ultrasonic welding head is configured to perform ultrasonic welding on the battery cell stacks pressed between the ultrasonic welding head and the welding protrusions at a set frequency and amplitude.

2. The ultrasonic welding apparatus for laminated battery cells according to claim 1, characterized in that, The welding bumps are raised structures distributed along the welding path of the battery cell stack.

3. The ultrasonic welding apparatus for laminated battery cells according to claim 2, characterized in that, The welding bumps are evenly distributed along the welding path of the cell laminations, and there is at least one row of them.

4. The ultrasonic welding apparatus for laminated battery cells according to claim 1, characterized in that, The limiting structure is a protruding limiting post.

5. The ultrasonic welding apparatus for laminated battery cells according to claim 1, characterized in that, The welding mechanism also includes a gantry frame, on which the ultrasonic welding head and the welding drive component are movable relative to each other.

6. The ultrasonic welding apparatus for laminated battery cells according to claim 5, characterized in that, The gantry frame has a slide rail, and the ultrasonic welding head and the welding drive are slidably connected to the slide rail.

7. The ultrasonic welding apparatus for laminated battery cells according to claim 6, characterized in that, The gantry frame also has a transverse drive for driving the ultrasonic welding head and the welding drive component to move along the slide rail.

8. The ultrasonic welding apparatus for laminated battery cells according to claim 5, characterized in that, At least two bases are provided within the range of the gantry frame; It also includes a loading and unloading drive assembly for driving each of the bases into or out of the gantry.

9. The ultrasonic welding apparatus for laminated battery cells according to claim 8, characterized in that, The loading and unloading drive assembly includes a track for sliding the base, and a motor lead screw structure connected to the base.

10. The ultrasonic welding apparatus for laminated battery cells according to claim 1, characterized in that, A pressure plate is rotatably connected to the edge of the base. The pressure plate can be flipped to press against the surface of the base to hold the non-welded parts of the battery cell stack.

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