Cover plate assembly stamping die and cover plate

Abstract

The utility model relates to the technical field of batteries, and discloses a cover plate assembly stamping die and a cover plate, when the die is used, an upper pressing plate is pressed above a lower die plate, and a punch punches an annular vertical wall downwards through a stamping hole, so that the annular vertical wall is bent downwards and is attached to the upper surface of a first insulating part, and a pole is fixed on a cover plate body. According to the cover plate assembling and forming process, the pre-riveting procedure and the laser welding procedure of the riveting block and the pole are omitted, so that the production procedure of the cover plate is simplified, the production efficiency of the cover plate is improved, the production cost of the cover plate is reduced, and the effects of reducing cost and improving efficiency are achieved. The positioning part is matched with the matching part in an inserted mode, so that the upper pressing plate can be stably kept on the lower die plate, the cover plate can be stably clamped, the upper pressing plate is matched with the limiting step to be connected to the top face of the first insulating part in a pressed mode, and all parts of the cover plate can be prevented from moving and misplacing when the cover plate is subjected to impact force in the stamping process; the stamping effect and the accuracy of the positions of all parts of the stamped cover plate can be effectively guaranteed, and the yield of the cover plate is increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, concretely relates to a cover plate assembly stamping die and cover plate. BACKGROUND

[0002] The battery cover plate includes a cover plate body 1', a pole 2', upper and lower plastic, a sealing ring and other structures. Figure 1 As shown in the drawing, the fixing structure of the pole and the cover plate body is mostly riveting structure, the riveting block 3' is connected with the pole through pre-riveting process first, and then is connected secondly through laser welding to achieve the purpose of reducing internal resistance. The existing riveting structure has many parts, and the assembly and forming process are complex, which leads to long production cycle, high production cost and low production efficiency of the cover plate. SUMMARY

[0003] Therefore, the utility model provides a cover plate assembly stamping die and cover plate to solve the problems of complex assembly forming process, high production cost and low efficiency in the prior art.

[0004] In a first aspect, the utility model provides a cover plate assembly stamping die for assembling and stamping a battery cover plate.

[0005] The lower die plate is provided with a recess and a positioning part thereon;

[0006] The upper pressing plate is provided with a stamping hole and a matching part thereon, and the bottom of the stamping hole is provided with a limiting step; the upper pressing plate is butted with the lower die plate, and the positioning part is inserted and matched with the matching part; when the die stamps the annular vertical wall, the cover plate is arranged in the recess and located between the lower die plate and the upper pressing plate, the annular vertical wall is located in the stamping hole, and the limiting step is pressed on the top surface of the first insulating part.

[0007] Beneficial Effects: When using the cover plate assembly stamping die of this structure, the pole is passed through the mounting holes on the second insulating component and the cover plate body. Then, the first insulating component is fitted onto the body from top to bottom. The cover plate is placed in the groove of the lower template, and the upper pressure plate presses down on the lower template. The punch punches downward through the stamping hole to press the annular vertical wall, causing the annular vertical wall to bend downward and fit against the upper surface of the first insulating component, thereby fixing the pole to the cover plate body. The cover plate assembly forming process eliminates the pre-riveting process of the riveting block and the pole, as well as the laser welding process, to simplify the cover plate production process, improve cover plate production efficiency, and reduce cover plate production costs, achieving the effect of cost reduction and efficiency improvement. The positioning part and the mating part are inserted and mated, which allows the upper pressure plate to be stably held on the lower template, thereby stably clamping the cover plate. The limiting step is pressed against the top surface of the first insulating component, which can prevent the various parts of the cover plate from moving and misaligning when subjected to impact force during stamping. This can effectively ensure the stamping effect and the accuracy of the position of various parts of the cover plate after stamping, and improve the yield of the cover plate.

[0008] In one alternative embodiment, the top of the punch hole is provided with a first chamfered bevel.

[0009] Beneficial effect: This design makes it easier for the punch to slide into the punching hole through the first chamfered bevel.

[0010] In one optional embodiment, the positioning part includes a positioning post protruding from the top of the lower template, the mating part includes a positioning hole, and the top of the positioning post is provided with a second chamfered bevel.

[0011] Beneficial effects: The positioning structure is simple and reliable. The setting of the second chamfered surface facilitates the insertion of the positioning post into the positioning hole, realizing the quick docking of the upper pressure plate and the lower template.

[0012] In one optional embodiment, the bottom surface of the second insulating member is provided with a first protrusion and a second protrusion located on both sides of the first protrusion; the bottom of the groove is provided with a first positioning groove and a second positioning groove located on both sides of the first positioning groove. When the mold stamps the annular vertical wall, the first protrusion and the second protrusion are respectively located in the first positioning groove and the second positioning groove.

[0013] In an optional embodiment, a first stamping tool is further included for performing a first stamping step on the annular vertical wall. The bottom of the first stamping tool is provided with a third chamfered bevel, and the angle between the third chamfered bevel and the outer peripheral wall of the first stamping tool is A, 0°. <A<50°。

[0014] Beneficial effects: During stamping, the bottom surface of the first stamping tool extends into the annular vertical wall, and the stamping inclined surface of the first stamping tool presses the annular vertical wall outward so that the annular vertical wall tilts toward the first insulating part. The inclination angle of the third chamfered inclined surface is moderate, which can prevent the annular vertical wall from being damaged due to excessive inclination angle caused by the first stamping step.

[0015] In one optional embodiment, the first stamping tool is cylindrical, the diameter of the bottom surface of the first stamping tool is a, and the inner diameter of the annular vertical wall is b, where a < b.

[0016] In one optional embodiment, the tool further includes an intermediate stamping tool for performing an intermediate stamping step on the annular vertical wall. The bottom surface of the intermediate stamping tool is provided with a fourth chamfered bevel, and the angle between the fourth chamfered bevel and the outer peripheral wall of the intermediate stamping tool is B, where A < B < 90°.

[0017] In one alternative implementation, A = 15°; and / or, A + 15° ≤ B ≤ A + 30°.

[0018] In one optional embodiment, the device further includes a final stamping tool for performing the final stamping step on the annular vertical wall. The bottom surface of the final stamping tool is a plane, and the area of ​​the bottom surface of the final stamping tool is greater than or equal to the area of ​​the outer contour of the annular vertical wall after it has been horizontally flattened.

[0019] Secondly, this utility model also provides a cover plate, which is stamped using a cover plate assembly stamping die as described in any one of the above. The cover plate includes a cover plate body, an electrode post, a first insulating component, and a second insulating component. The cover plate body, the first insulating component, and the second insulating component are all provided with mounting holes. The electrode post includes a base plate, a body part, and an annular vertical wall. The body part is disposed on the upper surface of the base plate, and the annular vertical wall is disposed around the outer edge of the upper surface of the body part. Attached Figure Description

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

[0021] Figure 1 This is a schematic diagram of the cover plate described in the background section of this utility model;

[0022] Figure 2 A schematic diagram of a cover plate assembly stamping die according to an embodiment of this utility model;

[0023] Figure 3 forFigure 2 Enlarged view of part A in the middle;

[0024] Figure 4 This is a schematic diagram of a pole post in a cover plate according to an embodiment of the present utility model;

[0025] Figure 5 This is a cross-sectional view of a pole post in a cover plate according to an embodiment of the present utility model;

[0026] Figure 6 This is a schematic diagram of another type of cover plate pole according to an embodiment of the present utility model;

[0027] Figure 7 This is a schematic diagram of the assembly of the second insulating component and the cover plate body in a cover plate assembly molding process according to an embodiment of the present utility model;

[0028] Figure 8 This is a schematic diagram of the second insulating component and the cover plate body assembled in a cover plate assembly molding process according to an embodiment of the present utility model.

[0029] Figure 9 This is a schematic diagram of the assembly of the sealing element and the pole post in a cover plate assembly molding process according to an embodiment of the present utility model;

[0030] Figure 10 This is a schematic diagram of the sealing element and the pole after assembly in a cover plate assembly molding process according to an embodiment of the present utility model;

[0031] Figure 11 This is a schematic diagram illustrating the assembly of the sealing element, the pole, the cover plate body, and the second insulating element in a cover plate assembly molding process according to an embodiment of this utility model.

[0032] Figure 12 This is a schematic diagram showing the assembled sealing element, pole, cover plate body, and second insulating element in a cover plate assembly molding process according to an embodiment of the present utility model.

[0033] Figure 13 This is a schematic diagram of the assembly of the first insulating component and the pole post in a cover plate assembly molding process according to an embodiment of the present utility model;

[0034] Figure 14 This is a schematic diagram of the first insulating component and the pole post assembled in a cover plate assembly molding process according to an embodiment of the present utility model;

[0035] Figure 15 This is a schematic diagram of the first stamping process in a cover plate assembly forming process according to an embodiment of the present utility model;

[0036] Figure 16 This is a schematic diagram of the first stamping process in a cover plate assembly forming process according to an embodiment of the present utility model;

[0037] Figure 17 This is a schematic diagram of the second stamping process in a cover plate assembly forming process according to an embodiment of the present utility model;

[0038] Figure 18 This is a schematic diagram of the second stamping process in a cover plate assembly forming process according to an embodiment of the present utility model;

[0039] Figure 19 This is an exploded view of a cover plate and a mold according to an embodiment of the present utility model;

[0040] Figure 20 This is a schematic diagram of the first stamping tool according to an embodiment of the present utility model;

[0041] Figure 21 This is a schematic diagram of the intermediate stamping tool according to an embodiment of the present utility model;

[0042] Figure 22 This is a schematic diagram of the final stamping tool and the pole post according to an embodiment of the present invention;

[0043] Figure 23 This is a schematic diagram of the final stamping tool and the pole post in an embodiment of the present invention.

[0044] Explanation of reference numerals in the attached figures:

[0045] 1' Cover plate body; 2' Pole post; 3' Riveting block; 1. Cover plate body; 2. Pole post; 201. Base plate; 202. Body part; 203. Annular vertical wall; 2031. Partition groove; 3. First insulating component; 4. Second insulating component; 401. First protrusion; 402. Second protrusion; 501. Upper pressure plate; 5011. Punching hole; 50111. Limiting step; 50112. First chamfered bevel; 5012. Mating part; 502. Lower template; 5021. Groove; 5022. Positioning part; 50221. Second chamfered bevel; 5023. First positioning groove; 5024. Second positioning groove; 6. First punching tool; 601. Third chamfered bevel; 7. Intermediate punching tool; 701. Fourth chamfered bevel; 8. Final punching tool; 9. Sealing component. Detailed Implementation

[0046] 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, 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.

[0047] When a cover plate is placed on the top opening of the housing, the upper side of the cover plate is called the upper side, and the lower side of the cover plate is called the lower side.

[0048] The following is combined Figures 2 to 23 The following describes embodiments of the present invention.

[0049] According to an embodiment of the present invention, in one aspect, a cover plate assembly stamping die is provided for assembling a stamped battery cover plate. The battery cover plate includes a cover plate body 1, a terminal post 2, a first insulating member 3, and a second insulating member 4. Mounting holes are provided on the cover plate body 1, the first insulating member 3, and the second insulating member 4. The terminal post 2 includes a base plate 201, a body portion 202, and an annular vertical wall 203. The body portion 202 is disposed on the upper surface of the base plate 201, and the annular vertical wall 203 is disposed around the outer edge of the upper surface of the body portion 202.

[0050] The cover plate assembly stamping die includes a lower template 502 and an upper pressure plate 501. The lower template 502 is provided with a groove 5021 and a positioning part 5022. The upper pressure plate 501 is provided with a stamping hole 5011 and a mating part 5012. The bottom of the stamping hole 5011 is provided with a limiting step 50111. The upper pressure plate 501 is connected to the lower template 502, and the positioning part 5022 is inserted into the mating part 5012. When the die stamps the annular vertical wall 203, the cover plate is located in the groove 5021 and between the lower template 502 and the upper pressure plate 501. The annular vertical wall 203 is located in the stamping hole 5011, and the limiting step 50111 is pressed against the top surface of the first insulating member 3.

[0051] When using the stamping die for assembling the cover plate, the pole post 2 is passed through the mounting holes on the second insulating member 4 and the cover plate body 1. Then, the first insulating member is fitted onto the body part 202 from top to bottom. The cover plate is placed in the groove 5021 of the lower template 502, and the upper pressure plate 501 presses down on the lower template 502. The punch punches downward through the punching hole 5011 to press the annular vertical wall 203 downward, so that the annular vertical wall 203 bends downward and fits against the upper surface of the first insulating member, thereby fixing the pole post 2 to the cover plate body 1. The cover plate assembly forming process eliminates the pre-riveting process of the riveting block and the pole post 2 as well as the laser welding process, thereby simplifying the cover plate production process, improving the cover plate production efficiency, reducing the cover plate production cost, and achieving the effect of cost reduction and efficiency improvement. The positioning part 5022 and the mating part 5012 are inserted and mated together, which allows the upper pressure plate 501 to be stably held on the lower template 502, thereby stably clamping the cover plate. The limiting step 50111 is pressed against the top surface of the first insulating member 3, which can prevent the various parts of the cover plate from moving or misaligning when subjected to impact force during the stamping process. This can effectively ensure the stamping effect and the accuracy of the position of each part of the cover plate after stamping, and improve the yield of the cover plate.

[0052] In some alternative embodiments, such as Figure 3As shown, a first chamfered inclined surface 50112 is provided at the top of the stamping hole 5011. This setting facilitates the punch to slide into the stamping hole 5011 through the first chamfered inclined surface 50112.

[0053] In some embodiments, the positioning portion 5022 includes positioning columns protruding from the top of the lower template 502, and the mating portion 5012 includes positioning holes. A second chamfered inclined surface 50221 is provided at the top of the positioning column. The positioning structure is simple and reliable. The setting of the second chamfered inclined surface 50221 facilitates the insertion of the positioning column into the positioning hole, realizing the quick docking of the upper pressing plate 501 and the lower template 502.

[0054] As Figure 2 and Figure 15 shown, a first protruding portion 401 and second protruding portions 402 located on both sides of the first protruding portion 401 are provided on the bottom surface of the second insulating member 4; a first positioning groove 5023 and second positioning grooves 5024 located on both sides of the first positioning groove 5023 are provided at the bottom of the groove 5021. When the die stamps the annular vertical wall 203, the first protruding portion 401 and the second protruding portions 402 are respectively located in the first positioning groove 5023 and the second positioning grooves 5024 to accommodate and position the protruding portions at the bottom of the cover plate through the first positioning groove 5023 and the second positioning grooves 5024.

[0055] As Figure 15 、 Figure 16 and Figure 20 shown, the cover plate assembly stamping die further includes a first stamping tool 6 for performing the first step of stamping on the annular vertical wall 203. A third chamfered inclined surface 601 is provided at the bottom of the first stamping tool 6. The included angle between the third chamfered inclined surface 601 and the outer peripheral wall of the first stamping tool 6 is A, 0° < A < 50°. During stamping, the bottom surface of the first stamping tool 6 extends into the annular vertical wall 203, and the stamping inclined surface of the first stamping tool 6 extrudes the annular vertical wall 203 outward, causing the annular vertical wall 203 to tilt towards the first insulating member 3. The inclination angle of the third chamfered inclined surface 601 is appropriate, which can prevent the annular vertical wall 203 from being damaged due to excessive inclination angle caused by the first step of stamping.

[0056] The first stamping tool 6 is cylindrical. The diameter of the bottom surface of the first stamping tool 6 is a, and the inner diameter of the annular vertical wall 203 is b, a < b. This facilitates the bottom surface of the first stamping tool 6 to extend into the inner side of the annular vertical wall 203 and enables the stamping inclined surface to extrude the annular vertical wall 203 outward.

[0057] As Figure 21As shown, the cover plate assembly stamping die also includes an intermediate stamping tool 7 for intermediate stamping of the annular vertical wall 203. The bottom surface of the intermediate stamping tool 7 is provided with a fourth chamfered bevel 701. The angle between the fourth chamfered bevel 701 and the outer peripheral wall of the intermediate stamping tool 7 is B, where A < B < 90°. The annular vertical wall 203 is stamped using at least three stamping processes, where B > A, so that the inclination angle of the annular vertical wall 203 is gradually increased during the stamping process until the annular vertical wall 203 is stamped to a horizontal state, which is beneficial to improving the stability of the structure after the annular vertical wall 203 is flanged.

[0058] In some optional embodiments, A = 15°; and / or, A + 15° ≤ B ≤ A + 30°. The annular vertical wall 203 is stamped to an outward tilting state in the first stamping step, and then the tilt angle of the annular vertical wall 203 can be increased by the intermediate stamping tool 7. Alternatively, the annular vertical wall 203 can be directly stamped to a horizontal state by the final stamping tool 8, which can improve stamping efficiency. A + 15° ≤ B ≤ A + 30°, the downward tilt angle of the stamping tilting surface of the intermediate stamping tool 7 is 15° to 30° larger than the downward tilt angle of the stamping tilting surface of the first stamping tool 6. The increase in the angle of the stamping tilting surface of the intermediate stamping tool 7 is moderate, ensuring that the tilt angle of the annular vertical wall 203 gradually increases during the stamping process, while maintaining stamping efficiency and improving the forming efficiency of the cover plate. This prevents the annular vertical wall 203 from being damaged due to an excessively large angle of the stamping tilting surface of the intermediate stamping tool 7, and also prevents the stamping efficiency from being affected by an excessively small angle of the stamping tilting surface of the intermediate stamping tool 7.

[0059] Optionally, B = 70°, so that after the first stamping step, the annular vertical wall 203 is further stamped and bent downwards.

[0060] like Figure 17 , Figure 18 and Figure 23 As shown, the cover plate assembly stamping die also includes a final stamping tool 8 for the final stamping of the annular vertical wall 203. The bottom surface of the final stamping tool 8 is a plane, and the area of ​​the bottom surface of the final stamping tool 8 is greater than or equal to the area of ​​the outer contour of the annular vertical wall 203 after it is horizontally flattened. This setting makes it convenient to completely flatten the annular vertical wall 203 by the final stamping tool 8.

[0061] According to an embodiment of the present invention, another aspect is provided: a cover plate assembly and forming process, such as... Figures 7 to 18 As shown, the cover plate assembly process includes the following steps:

[0062] The second insulating element 4 is disposed on the lower surface of the cover plate body 1;

[0063] The main body 202 passes through the mounting holes of the second insulating member 4 and the cover plate body 1 from bottom to top, and the annular vertical wall 203 is located on the upper side of the upper surface of the cover plate body 1, and the bottom plate 201 abuts against the lower surface of the second insulating member 4.

[0064] The first insulating component 3 is fitted onto the main body 202;

[0065] The annular vertical wall 203 is stamped using a stamping tool so that the annular vertical wall 203 bends toward the upper surface of the first insulating member 3 and adheres to the upper surface of the first insulating member 3.

[0066] In this utility model's cover plate assembly and forming process, the main body 202 of the pole post 2 is provided with an annular vertical wall 203. During cover plate assembly and forming, the pole post 2 is passed through the mounting holes on the second insulating member 4 and the cover plate body 1. Then, the first insulating member 3 is fitted onto the main body 202 from top to bottom. The annular vertical wall 203 is then stamped to bend downwards and adhere to the upper surface of the first insulating member 3, thereby fixing the pole post 2 to the cover plate body 1. The cover plate assembly and forming process eliminates the pre-riveting process between the riveting block and the pole post 2, as well as the laser welding process, thereby simplifying the cover plate production process, improving cover plate production efficiency, reducing cover plate production costs, and achieving the effect of cost reduction and efficiency improvement.

[0067] Optionally, in one embodiment, before stamping the annular vertical wall 203, the following steps are further included: placing the cover plate into and positioning it in the mold, the mold having a stamping hole 5011, the annular vertical wall 203 being disposed within the stamping hole 5011, and the stamping tool stamping the annular vertical wall 203 downward through the stamping hole 5011. The assembled cover plate is then placed into the mold, and the mold positions the cover plate to prevent displacement of the various parts of the cover plate during the stamping process, ensuring the stamping effect and the accuracy of the position of each part of the cover plate after forming.

[0068] like Figures 15 to 19 As shown, the mold includes an upper pressure plate 501 and a lower template 502. A punching hole 5011 is provided on the upper pressure plate 501. The lower template 502 is provided with a groove 5021 for accommodating the cover plate. The lower template 502 is provided with a positioning post. The upper template is provided with a positioning hole at the corresponding position. The cover plate is placed in the groove 5021 of the lower template 502. The lower pressure plate is pressed against the top of the cover plate. The positioning post is inserted into the positioning hole to clamp the cover plate between the upper pressure plate 501 and the lower template 502.

[0069] like Figure 5As shown, in one embodiment, the wall thickness of the annular vertical wall 203 is d, and the height of the annular vertical wall 203 protruding from the upper surface of the main body 202 is h, where 0.5mm≤d≤5mm and 1mm≤h≤5mm. The wall thickness and height of the annular vertical wall 203 are moderate, facilitating downward stamping and bending, while preventing the wall thickness from being too thin and causing breakage after stamping, thus preventing the annular vertical wall 203 from being stably fixed to the cover plate body 1. The moderate height of the annular vertical wall 203 ensures that after stamping and bending, it can overlap the upper surface of the first insulating member 3 to fix the first insulating member 3, while preventing the annular vertical wall 203 from being too high and inconvenient for stamping and bending.

[0070] The results of stamping the annular vertical wall 203 after selecting different wall thicknesses are shown in Table 1.

[0071] Table 1

[0072]

[0073] As shown in Table 1, when the thickness d of the annular vertical wall 203 is less than 0.5 mm, the annular vertical wall 203 becomes too thin, leading to warping and cracking after stamping. This results in structural instability and the annular vertical wall 203 cannot be stably held on the cover plate body 1. When 0.5 mm ≤ d ≤ 5 mm, the thickness of the annular vertical wall 203 is moderate, resulting in good structural stability after stamping and stable holding on the cover plate body 1. Simultaneously, the thickness of the annular vertical wall 203 is not too thick, facilitating stamping and allowing it to be flanged and attached to the upper surface of the first insulating component 3. When d > 5 mm, the annular vertical wall 203 becomes too thick, making flange stamping impossible, and also resulting in high material consumption and cost.

[0074] When d < 1 mm, the structural stability of the annular vertical wall 203 after stamping is poor, and the cooperation effect with the first insulating component 3 is not good. Therefore, preferably, in one embodiment, d and h satisfy 1 mm ≤ d ≤ 1.5 mm and 1.5 mm ≤ h ≤ 2.5 mm. The wall thickness and height of the annular vertical wall 203 are moderate, which is conducive to stamping and bending the annular vertical wall 203, while ensuring the integrity and structural strength of the annular vertical wall 203 after stamping, so that it is stably and firmly fixed on the cover plate body 1.

[0075] If the wall thickness of the annular vertical wall 203 is greater than its height, the annular vertical wall 203 is difficult to stamp and bend. Therefore, 1≤h:d≤10, that is, the thickness of the annular vertical wall 203 is less than or equal to its height, which facilitates the stamping and bending of the annular vertical wall 203, improves the stamping efficiency of the annular vertical wall 203, and thus improves the assembly and forming efficiency of the cover plate.

[0076] Optionally, in one embodiment, when stamping the annular vertical wall 203 using a stamping tool, at least two stamping processes are used to stamp the annular vertical wall 203. In the first stamping process, the angle between the stamping inclined surface of the first stamping tool 6 and the outer peripheral wall of the first stamping tool 6 is A, where 0° < A < 50°. The area of the outer contour of the bottom surface of the first stamping tool 6 is smaller than the area of the region enclosed by the inner wall of the annular vertical wall 203. In the first stamping, the annular vertical wall 203 is punched down to incline towards the first insulating member 3. The stamping end of the last stamping tool 8 used in the last stamping process is a flat surface, and the area of the stamping end of the last stamping tool 8 is larger than the outer contour area of the annular vertical wall 203 after being flattened horizontally. In the last stamping, the annular vertical wall 203 is stamped to be flush with the upper surface of the body portion 202.

[0077] At least two stamping processes are used to stamp the annular vertical wall 203 to gradually stamp the annular vertical wall 203 to a horizontal state, preventing the annular vertical wall 203 from being broken or damaged due to excessive single stamping force. As Figure 20 shown, the area of the outer contour of the bottom surface of the first stamping tool 6 is smaller than the area of the region enclosed by the inner wall of the annular vertical wall 203. During stamping, the bottom surface of the first stamping tool 6 extends into the annular vertical wall 203, and the stamping inclined surface of the first stamping tool 6 extrudes the annular vertical wall 203 outward, causing the annular vertical wall 203 to incline towards the first insulating member 3. The last stamping tool 8 is used to stamp the annular vertical wall 203 to a horizontal state. The area of the stamping end of the last stamping tool 8 is larger than the outer contour area of the annular vertical wall 203 after being flattened horizontally, that is, when the annular vertical wall 203 is bent to a horizontal state, the last stamping tool 8 can completely cover the annular vertical wall 203 to fully flatten all parts of the annular vertical wall 203.

[0078] Optionally, in one embodiment, at least three stamping processes are used to stamp the annular vertical wall 203, as Figure 21 shown. The angle between the stamping inclined surface of the intermediate stamping tool 7 used in the stamping process between the first stamping process and the last stamping process and the outer peripheral wall of the intermediate stamping tool 7 is B, where A < B < 90°. B > A to gradually increase the inclination angle of the annular vertical wall 203 during the stamping process until the annular vertical wall 203 is stamped to a horizontal state, which is beneficial to improving the structural stability of the annular vertical wall 203 after flanging.

[0079] Optionally, in one embodiment, A = 15°. By stamping the annular vertical wall 203 to an outward inclined state in the first stamping, the inclination angle of the annular vertical wall 203 can be increased by the intermediate stamping tool 7, or the annular vertical wall 203 can be directly stamped to a horizontal state by the last stamping tool 8, which can improve the stamping efficiency.

[0080] Optionally, A + 15° ≤ B ≤ A + 30°. The stamping inclined surface of the intermediate stamping tool 7 slopes downward at an angle 15° to 30° greater than that of the stamping inclined surface of the first stamping tool 6. The moderate increase in the angle of the stamping inclined surface of the intermediate stamping tool 7 can ensure that the inclination angle of the annular vertical wall 203 is gradually increased during stamping, and can ensure the stamping efficiency, thereby improving the forming efficiency of the cover plate, preventing the stamping inclined surface of the intermediate stamping tool 7 from having too large an angle and damaging the annular vertical wall 203; at the same time, preventing the angle of the stamping inclined surface of the intermediate stamping tool 7 from being too small and affecting the stamping efficiency. Optionally, B = 70°, so as to further stamp and bend the annular vertical wall 203 downward after the first step of stamping.

[0081] The test results of different values of A, different values of B and the stamping effect are shown in Table 2.

[0082] Table 2

[0083]

[0084] As can be seen from Table 2, when the angle A of the stamping inclined surface of the first stamping tool 6 is too small, the stamping tool cannot effectively stamp the annular vertical wall 203, and the annular vertical wall 203 cannot be flanged downward. When 0° < A ≤ 50°, the stamping is normal and the annular vertical wall 203 can be flanged downward normally; when A > 50°, the stamping tool will stick to the pole column 2, affecting the stamping rhythm and the quality of the pole column 2 after stamping, and the top surface of the pole column 2 after stamping is uneven or even cracked.

[0085] As Figure 16 and Figure 18 shown, when the first stamping tool 6 stops stamping, the distance from the upper surface of the body part 202 is 0 mm - 1 mm; and / or, the last stamping tool 8 stops stamping when it contacts the upper surface of the body part 202, so as to avoid over-stamping and damaging the annular vertical wall 203 or the upper surface of the body part 202.

[0086] Preferably, when the first stamping tool 6 stops stamping, the distance from the upper surface of the body part 202 is 0 mm. While avoiding over-stamping and damaging the annular vertical wall 203, it can ensure the stamping effect, which is conducive to the stamping inclined surface fully extruding the annular vertical wall 203, so that the annular vertical wall 203 is fully inclined and bent toward the first insulating part 3 side.

[0087] Optionally, in other embodiments, as Figures 15 to 18 shown, the annular vertical wall 203 can also be stamped by two-step stamping process. While ensuring the stamping effect, it can simplify the stamping steps and improve the forming effect of the cover plate assembly. In the first step, the first stamping tool 6 is used to stamp the annular vertical wall 203 to an outward inclined state, and in the second step, the last stamping tool 8 is used to stamp the annular vertical wall 203 to be flush with the upper surface of the body part 202.

[0088] The stamping tool is made of PM23 alloy tool steel, and the stamping surface of the stamping tool is mirror polished to ensure the smoothness of the top surface of the pole post 2 and the stamping surface of the stamping tool after stamping.

[0089] Optionally, in one embodiment, such as Figures 4 to 6 , Figures 9 to 19 As shown, the main body 202 of the pole post 2 is cylindrical, and an annular vertical wall 203 is provided on the outer edge of the top surface of the main body 202. The outer peripheral wall of the annular vertical wall 203 is flush with the outer peripheral wall of the main body 202. The area of ​​the main body 202 is smaller than that of the base plate 201. The main body 202 is located on the inner side of the edge of the base plate 201 and is located in the middle region of the base plate 201. The stamping tools for each stamping process are also cylindrical.

[0090] like Figure 23 As shown, the bottom diameter of the final stamping tool 8 is e, and the diameter of the annular vertical wall 203 in the horizontal state is f, e>f, so that the final stamping tool 8 can completely cover the annular vertical wall 203 and flatten the annular vertical wall 203.

[0091] In other embodiments, the body portion 202 of the pole post 2 may also be prismatic or elliptical cylindrical, and the cross-section of the body portion 202 may also be a racetrack shape with a rectangular center and semicircular sides. The shape of the annular vertical wall 203 is adapted to the shape of the body portion 202; that is, when the body portion 202 is cylindrical, the annular vertical wall 203 is circular; when the body portion 202 is a quadrangular prism, the annular vertical wall 203 is rectangular. The shape of the stamping tool is adapted to the shape of the annular vertical wall 203; for example, if the annular vertical wall 203 is rectangular, the stamping tool is quadrangular prism.

[0092] like Figure 9 and Figure 10 As shown, the cover plate also includes a sealing element 9. Before the main body 202 passes through the mounting holes of the second insulating member 4 and the cover plate body 1 from bottom to top, the sealing element 9 is fitted onto the main body 202 from top to bottom. The sealing element 9 acts as a seal between the cover plate body 1 and the electrode post 2 to prevent electrolyte leakage. Optionally, the sealing element 9 is a sealing ring.

[0093] The cover plate has two poles 2, one positive and one negative. The positive and negative poles have the same structure, each including a base plate 201, a body 202, and an annular vertical wall 203. The cover plate has two mounting holes. When stamping the annular vertical wall 203, two stamping tools can be used to simultaneously stamp the annular vertical wall 203 of the positive and negative poles to improve the assembly efficiency of the cover plate.

[0094] Optionally, the first insulating element 3 includes an upper plastic, the second insulating element 4 includes a lower plastic, and the cover plate body 1 includes a light aluminum sheet.

[0095] like Figures 7 to 18 As shown, the assembly and forming process of the cover plate is as follows:

[0096] Position the lower plastic piece on the lower surface of the aluminum sheet;

[0097] The sealing ring is fitted onto the body part 202 of the positive and negative terminals;

[0098] The positive and negative terminals are passed through the mounting holes of the lower plastic and the aluminum sheet from bottom to top, and the annular vertical wall 203 is located on the upper side of the upper surface of the aluminum sheet, with the base plate 201 abutting against the lower surface of the lower plastic.

[0099] The upper plastic sleeve is placed on the main body 202 of the positive and negative terminals;

[0100] Place the cover plate into the lower template 502 and press the upper pressure plate 501 onto the upper part of the cover plate;

[0101] The first stamping tool 6 is used to stamp the annular vertical wall 203 of the positive and negative terminals, so that the annular vertical wall 203 is tilted and bent towards the upward plastic.

[0102] The final stamping tool 8 is used to stamp the annular vertical wall 203 of the positive and negative terminals, and the annular vertical wall 203 is bent and attached to the upper surface of the upper plastic.

[0103] According to an embodiment of the present invention, in another aspect, a cover plate is also provided, which is formed by stamping with the above-mentioned cover plate assembly stamping die. The cover plate includes a cover plate body 1, an pole post 2, a first insulating member 3, and a second insulating member 4.

[0104] Mounting holes are provided on the cover plate body 1, the first insulating member 3, and the second insulating member 4. The pole post 2 includes a base plate 201, a body portion 202, and an annular vertical wall 203. The body portion 202 is disposed on the upper surface of the base plate 201, and the annular vertical wall 203 is arranged around the outer edge of the upper surface of the body portion 202. The second insulating member 4 is disposed on the lower surface of the cover plate body 1, and the first insulating member 3 is disposed on the upper surface of the cover plate body 1. The pole post 2 passes through the mounting holes of the second insulating member 4, the cover plate body 1, and the first insulating member 3 from bottom to top. The base plate 201 abuts against the lower surface of the second insulating member 4, and the annular vertical wall 203 presses against the upper surface of the first insulating member 3. The cover plate is directly bent downwards through the annular vertical wall 203 to adhere to the upper surface of the first insulating member 3, thereby fixing the pole post 2 and the first insulating member 3 to the cover plate body 1. The pole post 2 fixing structure is simple, and the cover plate is easy and quick to form.

[0105] like Figures 4 to 6As shown, before stamping, the outer peripheral wall of the annular vertical wall 203 is flush with the outer peripheral wall of the body portion 202. After bending, the upper surface of the annular vertical wall 203 is flush with the upper surface of the body portion 202. This allows the stamping tool to stop stamping when it contacts the upper surface of the body portion 202, thus flattening the annular vertical wall 203 and preventing excessive stamping damage to the annular vertical wall 203 or the body portion 202.

[0106] like Figure 6 As shown, in one embodiment, the annular vertical wall 203 is provided with a partition groove 2031, which divides the annular vertical wall 203 into at least two segments. The partition groove 2031 facilitates the rapid stamping of the annular vertical wall 203 by the stamping tool. One, two, or three partition grooves 2031 may be provided on the annular vertical wall 203, etc.

[0107] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A cover plate assembly stamping die, used for assembling stamped battery cover plates, characterized in that, The battery cover includes a cover body, a terminal post, a first insulating component, and a second insulating component. Mounting holes are provided on the cover body, the first insulating component, and the second insulating component. The terminal post includes a base plate, a body portion, and an annular vertical wall. The body portion is disposed on the upper surface of the base plate, and the annular vertical wall is disposed around the outer edge of the upper surface of the body portion. The cover assembly stamping die includes: The lower template has a groove and a positioning part; The upper pressure plate has a punching hole and a mating part, and the bottom of the punching hole has a limiting step; the upper pressure plate is connected to the lower template, and the positioning part is inserted into the mating part; when the mold punches the annular vertical wall, the cover plate is located in the groove and between the lower template and the upper pressure plate, the annular vertical wall is located in the punching hole, and the limiting step is pressed against the top surface of the first insulating part.

2. The cover plate assembly stamping die according to claim 1, characterized in that, The top of the punch hole is provided with a first chamfered bevel.

3. The cover plate assembly stamping die according to claim 1 or 2, characterized in that, The positioning part includes a positioning post protruding from the top of the lower template, the mating part includes a positioning hole, and the top of the positioning post is provided with a second chamfered bevel.

4. The cover plate assembly stamping die according to claim 1 or 2, characterized in that, The bottom surface of the second insulating member is provided with a first protrusion and a second protrusion located on both sides of the first protrusion; the bottom of the groove is provided with a first positioning groove and a second positioning groove located on both sides of the first positioning groove. When the mold stamps the annular vertical wall, the first protrusion and the second protrusion are respectively located in the first positioning groove and the second positioning groove.

5. The cover plate assembly stamping die according to claim 1 or 2, characterized in that, It also includes a first stamping tool for performing the first stamping step on the annular vertical wall. The bottom of the first stamping tool is provided with a third chamfered bevel, and the angle between the third chamfered bevel and the outer peripheral wall of the first stamping tool is A, 0°. <A<50°。 6. The cover plate assembly stamping die according to claim 5, characterized in that, The first stamping tool is cylindrical, with a diameter of the bottom surface of the first stamping tool being a, and the inner diameter of the annular vertical wall being b, where a < b.

7. The cover plate assembly stamping die according to claim 5, characterized in that, It also includes an intermediate stamping tool for performing intermediate stamping steps on the annular vertical wall. The bottom surface of the intermediate stamping tool is provided with a fourth chamfered bevel, and the angle between the fourth chamfered bevel and the outer peripheral wall of the intermediate stamping tool is B, where A < B < 90°.

8. The cover plate assembly stamping die according to claim 7, characterized in that, A = 15°; and / or, A + 15° ≤ B ≤ A + 30°.

9. The cover plate assembly stamping die according to claim 5, characterized in that, It also includes a final stamping tool for performing the final stamping step on the annular vertical wall. The bottom surface of the final stamping tool is a plane, and the area of ​​the bottom surface of the final stamping tool is greater than or equal to the area of ​​the outer contour of the annular vertical wall after it has been horizontally flattened.

10. A cover plate, characterized in that, The cover plate is formed by stamping with the stamping die according to any one of claims 1 to 9. The cover plate includes a cover plate body, an electrode post, a first insulating component and a second insulating component. The cover plate body, the first insulating component and the second insulating component are all provided with mounting holes. The electrode post includes a base plate, a body part and an annular vertical wall. The body part is disposed on the upper surface of the base plate and the annular vertical wall is disposed around the outer edge of the upper surface of the body part.

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