Device for reducing welding slag around battery cell

Abstract

The utility model discloses a device for reducing welding slag around a battery cell, which is characterized by comprising a mounting rack, the mounting rack is provided with a bottom plate and a top plate, the bottom plate is provided with a welding slag collecting component, and the welding slag collecting component is used for positioning the battery cell and collecting the welding slag; a laser welding assembly and a pressing cap assembly are installed on the top plate, the laser welding assembly is used for conducting peripheral welding on a cover plate of a battery cell and a shell, the pressing cap assembly is used for covering a positive pole, a negative pole and a liquid injection hole, on one hand, welding slag generated by laser peripheral welding can be effectively prevented from entering the shell, and the risk of short circuit caused by the welding slag is reduced; and on the other hand, the melting risk of the positive pole weak guide plate and the negative pole insulating plate by laser peripheral welding can be effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium ion batteries, in particular to a device for reducing welding slag around a battery core. Background Art

[0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, low self-discharge, and no memory effect. Since their commercialization, they have received widespread attention and application. However, square-shell lithium-ion batteries generally use laser welding for the periphery welding of the cover and shell. On the one hand, laser welding will produce metal welding slag, which will enter the battery cell through the injection hole and the gap between the cover and the shell, causing short circuit risks. On the other hand, the positive column weak conductor plate and the negative column insulating plate of the square shell battery cell are both made of plastic materials. Both are close to the edge of the cover. During the peripheral welding, the high temperature generated by the laser may melt the weak conductor plate and the insulating plate, causing safety and quality problems. Utility Model Content

[0003] In order to solve the technical problems existing in the background technology, the utility model proposes a device for reducing welding slag around a battery core.

[0004] The utility model provides a device for reducing welding slag around a battery core, comprising a mounting frame, the mounting frame having a bottom plate and a top plate, the bottom plate being provided with a welding slag collecting component, the welding slag collecting component being used for positioning the battery core and collecting welding slag;

[0005] A laser welding assembly and a pressure cap assembly are installed on the top plate. The laser welding assembly is used to perform peripheral welding on the cover plate and the battery shell of the battery cell, and the pressure cap assembly is used to cover the positive and negative poles and the injection hole.

[0006] Preferably, the welding slag collection assembly comprises a base, a vacuum exhaust pipe and a welding slag collection box, the base is used to fix the battery core, and the vacuum exhaust pipe is used to suck the welding slag into the collection box.

[0007] Preferably, the pressing cap assembly comprises a cylinder, a support rod and a pressing cap, the pressing cap is fixed to the bottom of the support rod, and the cylinder drives the pressing cap to move in the vertical direction through the support rod.

[0008] Preferably, the pressure cap is provided with recessed spaces which are respectively located at the first groove, the second groove and the third groove, the second groove and the third groove are respectively located on both sides of the first groove, the first groove is used to position and cover the positive and negative poles, and the second groove and the third groove are used to position and cover the injection hole.

[0009] Preferably, the material of the pressure cap is steel, and the width of the pressure cap is 3-5 mm narrower than that of the cover plate.

[0010] Preferably, the laser welding assembly comprises a turntable capable of adjusting the welding head and a laser welding head.

[0011] In the utility model, a device for reducing welding slag in the periphery of the battery cell is proposed. On the one hand, it can effectively reduce the welding slag generated by laser peripheral welding from entering the shell and reduce the risk of short circuit caused by welding slag. On the other hand, it can effectively reduce the risk of melting of the positive pole weak conductor plate and the negative pole insulating plate by laser peripheral welding.

[0012] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the utility model;

[0014] Figure 2 It is a structural schematic diagram of the medium-pressure cap of the utility model;

[0015] Figure 3 It is a schematic diagram of a typical square shell battery cell in the present utility model.

[0016] Explanation of the numbers in the figure: 1. Mounting frame; 2. Support rod; 3. Laser welding head; 4. Turntable; 5. Pressure cap; 6. Cover plate; 7. Exhaust pipe; 8. Base; 9. Welding slag collection box; 10. Battery cell shell; 101. Positive pole; 102. Positive weak guide plate; 103. Negative pole; 104. Negative pole insulating plate; 11. Cylinder. DETAILED DESCRIPTION

[0017] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar symbols throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0018] like Figure 1-Figure 3 A device for reducing welding slag around a battery cell is shown, comprising a mounting frame 1, wherein the mounting frame 1 has a bottom plate and a top plate, and a welding slag collecting component is provided on the bottom plate, wherein the welding slag collecting component is used to position the battery cell and collect welding slag;

[0019] The top plate is provided with a laser welding assembly and a pressure cap 5 assembly, wherein the laser welding assembly is used for peripheral welding of the cover plate 6 and the cell shell 10 of the cell, and the pressure cap 5 assembly is used for covering the positive and negative poles and the injection hole.

[0020] The utility model is applicable to square shell batteries such as Figure 2As shown, 101 is the positive pole, 102 is the positive weak conductor, 103 is the negative pole, 104 is the negative pole insulating plate, the weak conductor 102 and the insulating plate 104 are both made of plastic, and there are injection holes on both sides.

[0021] Preferably, the welding slag collection assembly includes a base 8, a vacuum exhaust pipe 7 and a welding slag collection box 9, the base 8 is used to fix the battery core, the vacuum exhaust pipe 7 is used to suck the welding slag into the collection box, the collection box is provided with a negative pressure fan, and when the welding slag vacuum collection assembly is started, the welding slag can be vacuum sucked into the exhaust pipe 7 and collected in the welding slag collection box 9.

[0022] Preferably, the pressing cap 5 assembly includes a cylinder 11, a support rod 2 and a pressing cap 5, wherein the pressing cap 5 is fixed to the bottom of the support rod 2, and the cylinder 11 drives the pressing cap 5 to move in the vertical direction through the support rod 2.

[0023] like Figure 3 As shown, the pressure cap 5 is provided with recessed spaces which are respectively located at the first groove, the second groove and the third groove, the second groove and the third groove are respectively located at both sides of the first groove, the first groove is used to locate and cover the positive and negative poles, and the second groove and the third groove are used to locate and cover the injection hole.

[0024] Preferably, the material of the pressing cap 5 is steel, and the width of the pressing cap 5 is 3-5 mm narrower than that of the cover plate 6 .

[0025] Preferably, the laser welding assembly comprises a turntable 4 capable of adjusting the welding head and a laser welding head 3 .

[0026] During the laser peripheral welding of the cover plate 6 and the cell shell 10 , the generated welding slag can easily enter the cell through the gap between the cover plate 6 and the shell and the injection hole, causing a short circuit.

[0027] On the other hand, since the weak guide plate and the insulating plate are close to the edge of the cover plate 6, the high temperature generated by laser welding can easily melt the plastic parts of the weak guide plate and the insulating plate, causing safety and quality problems.

[0028] During the specific working process of the device of this embodiment, the square shell battery cell is placed on the base 8 for fixing the battery cell, and then the pressure cap assembly cylinder 11 is started to position and fix the pressure cap 5 on the battery cell, and then the laser welding assembly and the welding slag collection assembly are started. While the laser head 3 performs peripheral welding on the battery cell cover 6 and the battery cell shell 10, the welding slag is absorbed into the welding slag collection box 9 through the vacuum pipe 7.

[0029] In a specific implementation, on the one hand, the risk of welding slag generated by laser peripheral welding entering the shell can be effectively reduced, reducing the risk of short circuit caused by welding slag; on the other hand, the risk of melting the positive pole weak conductor plate and the negative pole insulating plate caused by laser peripheral welding can be effectively reduced.

[0030] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0034] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A device for reducing welding slag around a battery core, characterized in that: The mounting frame (1) comprises a bottom plate and a top plate, a welding slag collecting assembly is arranged on the bottom plate, and the welding slag collecting assembly is used for positioning the battery core and collecting welding slag; A laser welding assembly and a pressure cap assembly are installed on the top plate, the laser welding assembly is used to perform peripheral welding on the cover plate (6) and the battery shell (10) of the battery cell, and the pressure cap assembly is used to cover the positive and negative poles and the injection hole; The pressing cap assembly comprises a cylinder (11), a support rod (2) and a pressing cap (5), wherein the pressing cap (5) is fixed to the bottom of the support rod (2), and the cylinder (11) drives the pressing cap (5) to move in a vertical direction through the support rod (2); The pressure cap (5) is provided with recessed spaces located at the first groove, the second groove and the third groove, respectively. The second groove and the third groove are located at two sides of the first groove, respectively. The first groove is used to locate and cover the positive and negative poles, and the second groove and the third groove are used to locate and cover the injection hole.

2. The device for reducing welding slag around a battery core according to claim 1, characterized in that: The welding slag collection assembly comprises a base (8), a vacuum exhaust pipe (7) and a welding slag collection box (9); the base (8) is used to fix the battery core, and the vacuum exhaust pipe (7) is used to suck the welding slag into the collection box.

3. The device for reducing welding slag around a battery core according to claim 1, characterized in that: The material of the pressing cap (5) is steel, and the width of the pressing cap (5) is 3-5 mm narrower than that of the cover plate (6).

4. The device for reducing welding slag around a battery core according to claim 1, characterized in that: The laser welding assembly comprises a rotating disk (4) capable of adjusting the welding head and a laser welding head (3).

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