A pressing tool for welding the terminal posts of power battery cover plates

Abstract

This utility model discloses a pressing fixture for welding the terminal posts of a power battery cover, belonging to the field of auxiliary fixtures. It includes a fixture body with a welding hole penetrating the fixture body. One end of the fixture body has a first surface and a second surface; the length of the first surface is smaller than the length of the second surface, and the distance between the first surface and the end face of the fixture body at the other end is smaller than the distance between the second surface and the end face of the fixture body at the other end. In use, because the thickness of the fixture body at the second surface is greater than that at the first surface, the contact between the second surface and the product is tighter when the fixture body presses down on the product for leveling, resulting in greater pressure on the product than at the first surface. This effectively levels the product's B-side, which has a larger deformation, ensuring that the flatness of the entire product meets quality requirements.

Description

Technical Field

[0001] This utility model relates to the field of auxiliary tooling, and in particular to a pressing tooling for welding the terminal posts of power battery cover plates. Background Technology

[0002] The battery cover is a key component of sealed batteries such as lithium-ion batteries. It primarily seals the battery cells, provides conductive channels for the terminals, and ensures battery safety. It typically consists of a cover body made of aluminum alloy or stainless steel, terminals, sealing rings, explosion-proof valves, and electrolyte injection holes. Terminal welding is a core process in manufacturing, mainly employing laser welding, resistance welding, or ultrasonic welding. Laser welding is most commonly used due to its small heat-affected zone and high precision. Precise control of parameters such as power (1000-3000W) and frequency (50-200Hz) is required to ensure welding quality. Before welding, material cleaning, surface treatment, and precise positioning are necessary. After welding, airtightness testing (leakage rate <1×10⁻⁶) is required. -7 Pa·m 3 Rigorous inspections, including X-ray testing and tensile testing, are conducted to prevent defects such as porosity, cracks, and poor soldering. This process directly affects the battery's sealing, conductivity, and safety.

[0003] For traditional cover structures, during the battery cover manufacturing process, the top cover may deform due to heat during the electrode welding process. Therefore, after laser welding, a pressing fixture is used to press down the top cover to reduce the deformation caused by heat. Currently used auxiliary pressing fixtures have a flat pressing surface, failing to consider the specific characteristics of top covers of different shapes and sizes. This results in poor flatness after welding, leading to unsatisfactory flatness of the top cover after electrode welding. Utility Model Content

[0004] This utility model provides a pressing tool for welding the terminal posts of power battery cover plates. It can solve the problem that the entire pressing surface of the auxiliary pressing tool in the prior art is a flat plane, which does not take into account the special characteristics of top covers of different shapes and sizes. This results in poor pressing and leveling effect after welding, and the top cover will have unqualified flatness after the terminal post is welded.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] A pressing tool for welding the terminal post of a power battery cover plate includes a tool body with a welding hole penetrating the tool body. One end of the tool body is provided with a first surface and a second surface. The length of the first surface is smaller than the length of the second surface, and the distance between the first surface and the end face of the other end of the tool body is smaller than the distance between the second surface and the end face of the other end of the tool body.

[0007] In one embodiment of this utility model, the tooling body has a rectangular structure.

[0008] In one embodiment of this utility model: the tooling body includes a first body and a second body, wherein the size of the first body is larger than the size of the second body.

[0009] In one embodiment of this utility model: the first main body and the second main body are an integral structure.

[0010] In one embodiment of this utility model, fixing holes are respectively provided at both ends of the tooling body.

[0011] In one embodiment of this utility model: two fixing holes are arranged as a group, and one set of fixing holes is provided at one end of the tooling body.

[0012] In one embodiment of this utility model: an avoidance notch is provided on the tooling body at a position between the first surface and the second surface, and the welding hole communicates with the avoidance notch.

[0013] In one embodiment of this utility model: the clearance notch is recessed to form a clearance groove, and the welding hole is connected to the clearance groove.

[0014] In one embodiment of this utility model: a welding notch is provided at one end of the tooling body away from the avoidance notch, and the welding notch communicates with the welding hole.

[0015] In one embodiment of this utility model, the welding notch is trumpet-shaped.

[0016] The pressing tool for welding the terminal posts of a power battery cover plate according to this utility model has at least one of the following technical effects:

[0017] When this device is in use, because the thickness of the fixture body at the second surface is greater than that at the first surface, the contact between the second surface and the product is tighter when the fixture body is pressing down on the product for leveling, resulting in greater pressure on the product than at the first surface. This effectively levels the B-side of the product, which has a larger deformation, ensuring that the flatness of the entire product meets quality requirements. This solves the problem in existing auxiliary pressing fixtures where the entire pressing surface is a single plane, failing to consider the specific characteristics of top covers of different shapes and sizes, leading to poor pressing and leveling effects after welding and resulting in flatness defects in the top cover after welding the pole. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood in conjunction with the following description of the embodiments with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. Wherein:

[0019] Figure 1 This is a three-dimensional structural schematic diagram of the present invention from one perspective;

[0020] Figure 2 This is a three-dimensional structural schematic diagram of the present invention from another perspective;

[0021] Figure 3 This utility model Figure 2 A schematic diagram of the structure from the middle side view;

[0022] Figure 4 This utility model Figure 2 A schematic diagram of the structure in the front view;

[0023] Figure 5 This utility model Figure 2 Mid-top view of the structure;

[0024] Figure 6 This utility model Figure 2 A structural diagram viewed from below;

[0025] Figure 7 This utility model Figure 6 A structural schematic diagram of the AA section.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Welding hole; 2. First surface; 3. Second surface; 4. First main body; 5. Second main body; 6. Fixing hole. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0029] During electrode welding, the pressing fixture presses down. However, because the cover plate product structure includes a pressing surface A and a pressing surface B, and because the lengths of surface A and B are different, the deformation of the product surface caused by heat during electrode welding is different. The longer surface B undergoes greater deformation due to heat than surface A. Based on this specific characteristic, this application modifies the existing pressing fixture by using a height difference method to level the surface of the top cover that is more affected by heat, ensuring welding yield while maintaining the flatness of the product itself. Specifically, the pressing tooling in this application adopts a design where surface A is thin (at position 2 of the first surface) and surface B is thick (at position 3 of the second surface). This means the distance between surface 2 and the other end face of the tooling body is less than the distance between surface 3 and the other end face of the tooling body. This creates a height difference between surface 2 and surface 3, with surface 3 corresponding to surface B of the product being slightly larger than surface 2 corresponding to surface A. When the tooling is pressed down, surface 3 contacts surface B of the product more tightly and exerts greater pressure compared to surface 2, which mates with surface A. Based on this, greater pressure is applied to surface B, which has greater deformation, ensuring that the flatness of surface A and surface B, which has greater thermal deformation, meets quality requirements after welding.

[0030] like Figure 1-7 As shown in the figure, this utility model provides a pressing fixture for welding the terminal posts of a power battery cover plate. The fixture body includes a main body with a welding hole 1 penetrating through it. One end of the main body has a first surface 2 and a second surface 3. The length of the first surface 2 is less than the length of the second surface 3. The specific lengths of the first surface 2 and the second surface 3 can be designed according to actual conditions, and their lengths need to be consistent with the product dimensions, or they can be extended at both ends to accommodate products of different lengths. The distance between the first surface 2 and the end face of the other end of the fixture body is slightly less than the distance between the second surface 3 and the end face of the other end of the fixture body.

[0031] When this device is in use, because the thickness of the fixture body at position 3 on the second side is greater than that at position 2 on the first side, the contact between position 3 and the product is tighter when the fixture body presses down on the product for leveling, and the pressure applied to the product is greater than that at position 2 on the first side. This allows for better leveling of surface B of the product, which has a larger deformation, thus ensuring that the flatness of the entire product meets quality requirements.

[0032] Please see Figure 1-7 In one embodiment of this utility model, the specific structure of the tooling body is not limited. As an example, the tooling body has a rectangular structure. The tooling body may include a first body 4 and a second body 5 of integral structure, wherein the size of the first body 4 is larger than the size of the second body 5. This facilitates the differentiation of the upper and lower ends and the handling of the tooling.

[0033] Please see Figure 1-7 In one embodiment of this utility model, fixing holes 6 are respectively provided at both ends of the tooling body. The fixing holes 6 can be in groups of two, with one group of fixing holes 6 provided at each end of the tooling body. By providing fixing holes 6, fasteners such as bolts and pins can be inserted to fix the tooling and cover plate.

[0034] Please see Figure 1-7 In one embodiment of this utility model, a clearance notch is formed by recessing the tooling body at a position between the first surface 2 and the second surface 3 (towards the other end face), and the welding hole 1 communicates with the clearance notch. Further, a clearance groove is formed by recessing the clearance notch, and the welding hole 1 communicates with the clearance groove. The clearance groove and clearance notch facilitate clearance of related structures on the cover plate.

[0035] Please see Figure 1-7 In one embodiment of this utility model, a welding notch is provided at the end of the tooling body away from the avoidance notch, and the welding notch communicates with the welding hole 1. The welding notch is trumpet-shaped. By providing the welding notch, more space is provided at the upper end of the tooling, facilitating welding operations.

[0036] The foregoing has provided a detailed description of one embodiment of the present invention, but the description is merely a preferred embodiment and should not be construed as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the claims of the present invention should still fall within the scope of the claims of the present invention.

[0037] In the description of this utility model, it should be noted that the terms "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, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are used only for the convenience of describing this utility model and for 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. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0038] In the description of this utility model, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0039] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A pressing tool for welding the terminal posts of a power battery cover plate, comprising a tool body, wherein the tool body has a welding hole penetrating the tool body, characterized in that, One end of the tooling body is provided with a first surface and a second surface; the length of the first surface is smaller than the length of the second surface, and the distance between the first surface and the end face of the other end of the tooling body is smaller than the distance between the second surface and the end face of the other end of the tooling body.

2. The pressing tool for welding the terminal posts of a power battery cover plate according to claim 1, characterized in that, The main body of the tooling has a rectangular structure.

3. The pressing tool for welding the terminal posts of a power battery cover plate according to claim 1, characterized in that, The tooling body includes a first body and a second body, wherein the size of the first body is larger than the size of the second body.

4. The pressing tool for welding the terminal posts of a power battery cover plate according to claim 3, characterized in that, The first main body and the second main body are an integral structure.

5. A pressing tool for welding the terminal posts of a power battery cover plate according to claim 1, characterized in that, Fixing holes are provided at both ends of the tooling body.

6. The pressing tool for welding the terminal posts of a power battery cover plate according to claim 5, characterized in that, The fixing holes are arranged in pairs, and one set of fixing holes is provided at one end of the tooling body.

7. A pressing tool for welding the terminal posts of a power battery cover plate according to claim 1, characterized in that, An clearance notch is provided on the main body of the tooling between the first and second surfaces, and the welding hole communicates with the clearance notch.

8. A pressing tool for welding the terminal posts of a power battery cover plate according to claim 7, characterized in that, The clearance notch is recessed to form a clearance groove, and the welding hole communicates with the clearance groove.

9. A pressing tool for welding the terminal posts of a power battery cover plate according to claim 8, characterized in that, A welding notch is provided at one end of the tooling body away from the avoidance notch, and the welding notch communicates with the welding hole.

10. A pressing tool for welding the terminal posts of a power battery cover plate according to claim 9, characterized in that, The weld notch is funnel-shaped.

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