A large cylindrical battery with a riveted structure collector plate and a steel shell and a preparation device

Abstract

The application discloses a large cylindrical battery with a riveting structure current collecting disc and a steel shell and a preparation device, and relates to the field of battery devices. The large cylindrical battery with the riveting structure current collecting disc and the steel shell and the preparation device comprise a steel shell body, and further comprise: a positive pole column hole is formed above the steel shell body, and a current collecting disc body is slidably connected in the steel shell body; the current collecting disc body comprises a base disc and a rivet part fixedly connected with the base disc, a riveting hole is formed in the rivet part, a thimble is slidably connected in the riveting hole, and the rivet part is slidably connected in the positive pole column hole; the base disc is sequentially sleeved with an insulating gasket A, a rubber gasket, an insulating gasket B and a copper sheet from bottom to top through the rivet part; the application can avoid various hidden troubles caused by welding, is beneficial to reducing the process cost, and is beneficial to improving the process qualified rate; meanwhile, the steps of manual operation are reduced during riveting, the operation time is saved, and the riveting efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of battery device technology, specifically, it relates to a large cylindrical battery with a riveted current collector and a steel shell, and a preparation device thereof. Background Technology

[0002] With the rapid development of the new energy vehicle and energy storage markets, higher demands are being placed on the energy density, safety, and cost of batteries. Large cylindrical batteries have emerged to meet these demands. By optimizing battery structure and adopting advanced materials and processes, they achieve high energy density, long cycle life, and high safety performance. These batteries are not only suitable for electric vehicles and energy storage systems, but are also gradually penetrating into emerging fields such as small-power applications and electric aviation. With continuous technological advancements and cost reductions, the market prospects for large cylindrical batteries will be even broader.

[0003] In the manufacturing process of large cylindrical batteries, the steel casing and current collector are two separate components. According to the current battery structure, the steel casing and current collector are often connected by laser welding on the aluminum electrode. However, aluminum is prone to reacting with air, forming a dense oxide film on the material surface. This causes changes in the melting point of the aluminum material on the welding surface, making it easy to generate surface wrinkles or slag inclusions during welding. Due to the "high reflectivity" of aluminum, the energy utilization rate is poor, and over-welding / insufficient welding is prone to occur during the welding process, resulting in poor welding yield and affecting production efficiency and cost. Based on this, the present invention is proposed, which can simply and effectively connect the casing and current collector, thereby avoiding the effects of laser welding. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a large cylindrical battery and preparation device with a riveted current collector and a steel shell that can overcome or at least partially solve the above problems.

[0005] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows: a large cylindrical battery with a riveted current collector and a steel shell, including a steel shell body, and further including: a positive electrode post hole opened on the upper part of the steel shell body, and a current collector body slidably connected inside the steel shell body; the current collector body includes a base plate and a rivet fixedly connected to the base plate, the rivet has a riveting hole, a pin is slidably connected to the riveting hole, and the rivet is slidably connected inside the positive electrode post hole; the base plate is fitted with an insulating gasket A, a rubber gasket, an insulating gasket B and a copper sheet sequentially from bottom to top through the rivet, the insulating gasket A and the rubber gasket are located between the steel shell body and the base plate, and the insulating gasket B and the copper sheet are located between the steel shell body and the pin; when the pin is pressed down by an external stamping part, the ball at the top of the pin enters the riveting hole and pushes the rivet outward, squeezing the copper sheet down to form a clamping and fixing of the steel shell body with the base plate.

[0006] Preferably, the top inner wall of the steel shell body is provided with an insulating layer, which is specifically one of a heat-resistant plastic part or an insulating coating, and the position of the insulating layer corresponds to the position of the base plate, the insulating gasket A and the rubber gasket.

[0007] Furthermore, the insulating pad A, rubber pad, insulating pad B, and copper sheet are all provided with circular holes of the same size. The diameter of the circular holes is the same as the diameter of the rivet. The outer diameter of the copper sheet is smaller than the outer diameter of the insulating pad A, rubber pad, and insulating pad B. The circular holes on the copper sheet are provided with riveting grooves, which are used to connect with the rivet after it has been extruded and deformed.

[0008] Furthermore, a welding area is provided on the top of the base plate, and an electrolytic medium is also provided inside the steel shell body, with the electrolytic medium in contact with the bottom of the base plate.

[0009] A fabrication apparatus for preparing a large cylindrical battery with a riveted current collector and a steel shell includes a support platform and further comprising: a support plate fixedly connected to the support platform, a rotating shaft rotatably connected to the support plate, a base plate fixedly connected to the rotating shaft, and support rods fixedly connected to both sides of the base plate; a support block slidably connected to the support rod, and a top block fixedly connected to the support block for providing support for the base plate; a support frame fixedly connected to the support platform, and a cylinder fixedly connected to the support frame, with a fixing block fixedly connected to the output end of the cylinder; a circular groove formed on the fixing block, and a limit block slidably connected to the circular groove, the bottom of the limit block having a chamfer for auxiliary limiting of the steel shell body.

[0010] Preferably, a connecting rod is fixedly connected to the fixing block, a limit rod is slidably connected to the connecting rod, a ratchet plate is fixedly connected to the limit rod, and a second compression spring is connected between the ratchet plate and the connecting rod.

[0011] Furthermore, a ratchet gear is fixedly connected to the rotating shaft, the ratchet gear meshes with a ratchet plate, and the number of ratches on the ratchet plate is half the number of ratches on the ratchet gear.

[0012] Preferably, a first compression spring is connected between the fixing block and the limiting block, and a limiting block is fixedly connected to the top block. The riveting is completed when the fixing block presses the bottom of the ejector pin into contact with the limiting block.

[0013] Preferably, a top rod is slidably connected to both the upper and lower support blocks. The top rod is slidably connected to the bottom plate. A third compression spring is connected between the support block and the bottom plate. When the support block above the bottom plate is subjected to pressure and moves downward, the steel shell body squeezes the top rod downward and pushes it out from the support block below.

[0014] Preferably, the support platform has a feeding port, which corresponds to the position of the support block, and the feeding port is used to catch large cylindrical batteries that fall from the support block.

[0015] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0016] 1. This invention achieves the fixation of the manifold by riveting with rivets. By replacing welding with riveting, various hidden problems caused by welding can be avoided, process costs can be reduced, and the process qualification rate can be improved, thus achieving the goal of cost reduction and efficiency improvement.

[0017] 2. In the riveting process, the fixed block drives the limiting block to move down. Under the action of the first compression spring, the limiting block can compact the current collector, insulating gasket A, insulating gasket B, rubber gasket, and copper sheet, thus avoiding gaps between these components during assembly. It can also assist in positioning the battery to be installed.

[0018] 3. This invention can automatically demold the riveted battery while riveting, reducing manual operation steps, saving operation time, and improving riveting efficiency.

[0019] 4. In this invention, the top block can prevent the stamping device from exerting excessive pressure on the manifold, insulating gasket A, insulating gasket B, rubber gasket, and copper sheet during the riveting process, which could lead to damage or deformation of the parts. Attached Figure Description

[0020] In the attached diagram:

[0021] Figure 1 This is a three-dimensional structural diagram of a large cylindrical battery with a riveted current collector and a steel shell proposed in this invention.

[0022] Figure 2 This is a schematic diagram of the steel shell body in a large cylindrical battery with a riveted current collector and a steel shell, as proposed in this invention.

[0023] Figure 3 This is a cross-sectional view of a large cylindrical battery with a riveted current collector and a steel shell, as proposed in this invention.

[0024] Figure 4 This invention proposes a large cylindrical battery with a riveted current collector and a steel casing. Figure 3 Enlarged structural diagram at point A;

[0025] Figure 5 This is a structural view of the upper part of the current collector body in a large cylindrical battery with a riveted current collector structure and a steel shell, as proposed in this invention.

[0026] Figure 6 This is a schematic diagram of the current collector body in a large cylindrical battery with a riveted current collector structure and a steel shell, as proposed in this invention.

[0027] Figure 7 This is a schematic diagram of the structure of the circular hole in a large cylindrical battery with a riveted current collector and a steel shell, as proposed in this invention.

[0028] Figure 8 This is a schematic diagram of the fabrication apparatus for a large cylindrical battery with a riveted current collector and a steel shell, as proposed in this invention.

[0029] Figure 9 This invention provides a fabrication apparatus for a large cylindrical battery with a riveted current collector and a steel casing. Figure 8 Enlarged structural diagram at point B;

[0030] Figure 10 This is a cross-sectional view of a fabrication apparatus for a large cylindrical battery with a riveted current collector and a steel shell, as proposed in this invention.

[0031] Figure 11 This is a cross-sectional view of the support block in the fabrication apparatus of a large cylindrical battery with a riveted current collector and a steel shell, as proposed in this invention.

[0032] Figure 12 This invention provides a fabrication apparatus for a large cylindrical battery with a riveted current collector and a steel casing. Figure 10 A magnified structural diagram at point C.

[0033] In the diagram: 1. Steel shell body; 101. Insulation layer; 102. Electrolytic medium; 103. Positive electrode post hole; 2. Current collector body; 201. Base plate; 202. Welding area; 203. Rivet; 204. Rivet hole; 205. Ejector pin; 3. Insulating gasket A; 301. Round hole; 4. Rubber gasket; 5. Insulating gasket B; 6. Copper sheet; 601. Rivet groove; 7. Support platform; 71. Support plate; 72. Support 73. Support frame; 74. Cylinder; 75. Base plate; 76. Rotating shaft; 775. Ratchet; 776. Discharge port; 8. Fixing block; 875. Circular slide groove; 88. Limiting block; 89. First compression spring; 80. Connecting rod; 81. Ratchet plate; 82. Limiting rod; 83. Second compression spring; 94. Support block; 95. Top rod; 96. Support rod; 97. Third compression spring; 98. Top rod. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0035] Example 1: Refer to Figures 1-7 A large cylindrical battery with a riveted current collector and a steel shell includes a steel shell body 1, and further includes: a positive electrode post hole 103 opened on the top of the steel shell body 1, and a current collector body 2 slidably connected inside the steel shell body 1; the current collector body 2 includes a base plate 201 and a rivet 203 fixedly connected to the base plate 201, the rivet 203 having a riveting hole 204, a pin 205 slidably connected to the riveting hole 204, and the rivet 203 slidably connected inside the positive electrode post hole 103; the base plate 201 is connected through... The rivet 203 is fitted with an insulating gasket A3, a rubber gasket 4, an insulating gasket B5, and a copper sheet 6 from bottom to top. The insulating gasket A3 and the rubber gasket 4 are located between the steel shell body 1 and the base plate 201, and the insulating gasket B5 and the copper sheet 6 are located between the steel shell body 1 and the ejector pin 205. When the ejector pin 205 is pressed down by the external stamping part, the ball at the top of the ejector pin 205 enters the riveting hole 204 and pushes the rivet 203 outward, squeezing the copper sheet 6 down to form a clamping and fixing of the steel shell body 1 with the base plate 201.

[0036] Unlike traditional large cylindrical batteries, this invention features a cylindrical rivet 203 on the base plate 201. The rivet 203 can be inserted into the steel casing 1 through the positive terminal hole 103. Simultaneously, insulating gaskets A3, B5, and copper sheet 6 can be sequentially fitted onto the rivet 203, thus completing the installation of the internal structure of the large cylindrical battery. Insulating gaskets A3 and B5 isolate the current inside the battery, and the rubber gasket 4 prevents electrolyte leakage from the connection point. After all components are installed in sequence, an external pressing component can press a pin 205 into the riveting hole 204. The pin 205 consists of a lower cylindrical needle body and an upper spherical needle head. The diameter of the cylindrical needle body is the same as the diameter of the riveting hole 204. Similarly, the diameter of the spherical needle is larger than that of the cylindrical needle body. As a result, when the ejector pin 205 is pressed into the riveting hole 204, the spherical needle will push the rivet 203 outward, causing the rivet 203 to expand and deform. As the ejector pin 205 moves downward, the expanded part of the rivet 203 increases, directly pressing the copper sheet 6 downward. This creates a clamping relationship between the copper sheet 6 and the base plate 201, which together clamp the components between them. The clamped components are also connected to the steel shell body 1, thus completing the fixation between all components and the steel shell. This solves the various hidden problems caused by the need for welding to fix various components to the steel shell body 1. Using riveting instead of welding helps to reduce process costs and improve the process qualification rate, achieving the goal of cost reduction and efficiency improvement.

[0037] Example 2: Refer to Figures 1-7 A large cylindrical battery with a riveted current collector and a steel shell is basically the same as in Embodiment 1, but with the following further feature: an insulating layer 101 is provided on the top inner wall of the steel shell body 1. The insulating layer 101 is specifically one of a heat-resistant plastic part or an insulating coating. The position of the insulating layer 101 corresponds to the positions of the base plate 201, the insulating pad A3, and the rubber pad 4. The insulating pad A3, the rubber pad 4, the insulating pad B5, and the copper sheet 6 are all provided with circular holes 301 of the same size. The diameter of the round hole 301 is the same as the diameter of the rivet 203. The outer diameter of the copper sheet 6 is smaller than the outer diameter of the insulating gasket A3, the rubber gasket 4 and the insulating gasket B5. The round hole 301 on the copper sheet 6 is provided with a riveting groove 601, which is used to connect with the rivet 203 after extrusion and deformation. The top of the base plate 201 is provided with a welding area 202. The steel shell body 1 is also provided with an electrolytic medium 102, which is in contact with the bottom of the base plate 201.

[0038] In this invention, the insulating layer 101 mainly prevents the electrons inside the battery from contacting the insulating pad A3 and the rubber pad 4 and causing adverse effects. By opening a riveting groove 601 in the round hole 301 on the copper sheet 6, the contact area between the copper sheet 6 and the rivet 203 after being stretched and deformed by the ejector pin 205 can be increased, thereby enhancing the fixing effect after riveting.

[0039] When placing the current collector body 2, it is placed from the bottom of the steel shell body 1. After the current collector body 2 is fixed by riveting, the electrolytic medium 102 is filled into the steel shell body 1, and then the bottom of the steel shell body 1 is sealed, thereby forming a large cylindrical battery. The welding area 202 on the base plate 201 can connect the battery electrodes or other electronic components to the bottom of the current collector body 2. Through welding, the current can be concentrated on the current collector body 2.

[0040] Example 3: Reference Figures 1-12 A fabrication apparatus for preparing a large cylindrical battery with a riveted current collector and a steel shell includes a support platform 7, and further includes: a support plate 71 fixedly connected to the support platform 7, a rotating shaft 75 rotatably connected to the support plate 71, a base plate 74 fixedly connected to the rotating shaft 75, and support rods 93 fixedly connected to both sides of the base plate 74; a support block 9 slidably connected to the support rod 93, and a top block 91 fixedly connected to the support block 9, the top block 91 being used to provide support for the base plate 201; a support frame 72 fixedly connected to the support platform 7, a cylinder 73 fixedly connected to the support frame 72, and a fixing block 8 fixedly connected to the output end of the cylinder 73; a circular groove 81 is provided on the fixing block 8, and a limit block 82 is slidably connected to the circular groove 81, the bottom of the limit block 82 having a chamfer for auxiliary limiting of the steel shell body 1.

[0041] In this invention, after the user has assembled all the structures in a predetermined order, the assembled battery assembly can be placed on the support block 9 through the steel shell body 1. Then, the cylinder 73 is activated to drive the fixing block 8 to move down. During the downward movement, the limiting block 82 first contacts the steel shell body 1. Under the guidance of the chamfer, the limiting block 82 can limit the position of the steel shell body 1 to ensure that the position of the steel shell body 1 will not shift during the riveting process. Then, the fixing block 8 continues to move down to press the ejector pin 205 to complete the riveting.

[0042] Because the pressure generated during the riveting process is relatively large, in order to prevent the base plate 201 from deforming or being damaged, a top block 91 is designed on the support block 9. The diameter of the top block 91 is slightly larger than the diameter of the rivet 203, so that most of the pressure during the riveting process is borne by the rivet 203. Since the rivet 203 is cylindrical, it can withstand greater pressure and is not easily deformed. This design can effectively reduce the damage to parts that may be caused during the riveting process.

[0043] Example 4: Reference Figures 1-12 A fabrication apparatus for preparing a large cylindrical battery with a riveted current collector and a steel shell is basically the same as in Example 3, but with the following additional features: a connecting rod 84 is fixedly connected to the fixing block 8, a limiting rod 851 is slidably connected to the connecting rod 84, a ratchet plate 85 is fixedly connected to the limiting rod 851, a second compression spring 852 is connected between the ratchet plate 85 and the connecting rod 84, a ratchet gear 751 is fixedly connected to the rotating shaft 75, the ratchet gear 751 meshes with the ratchet plate 85, the number of ratches on the ratchet plate 85 is half the number of ratches on the ratchet gear 751, and a first compression spring is connected between the fixing block 8 and the limiting block 82. Spring 83, limit block 92 is fixedly connected to top block 91. When fixed block 8 squeezes the bottom of ejector pin 205 and contacts limit block 92, the riveting is completed. Top rod 95 is slidably connected to the upper and lower support blocks 9. Top rod 95 is slidably connected to bottom plate 74. Third compression spring 94 is connected between support block 9 and bottom plate 74. When support block 9 above bottom plate 74 is subjected to pressure and moves down, steel shell body 1 squeezes top rod 95 and moves down to push out from support block 9 below. Feed port 76 is opened on support platform 7. Feed port 76 is corresponding to the position of support block 9. Feed port 76 is used to catch large cylindrical batteries falling from support block 9.

[0044] In this invention, the rotating shaft 75 and the support plate 71 are interference-fitted. When the fixing block 8 moves down, it drives the connecting rod 84 to move down as well. The connecting rod 84 drives the ratchet plate 85 to move together. The back of the ratchet teeth on the ratchet plate 85 slides over the ratchet gear 751. At this time, the rotating shaft 75 will not rotate. After the riveting is completed, the fixing block 8 drives the connecting rod 84 and the ratchet plate 85 to move up together. During the upward movement of the ratchet plate 85, under the action of the second compression spring 852, the ratchet plate 85 drives the ratchet gear 751 to rotate together. The number of ratchet teeth on the ratchet plate 85 is half the number of ratchet teeth on the ratchet gear 751. Therefore, the ratchet plate 85 will drive the ratchet gear 751 and the rotating shaft 75 to rotate half a turn, thereby causing the base plate 74 to flip, so that the support block 9 and the riveted large cylindrical battery head face down, while the original lower support block 9 is transferred to the lower part of the base plate 75. Above, when the large cylindrical battery is fitted and riveted onto the support block 9 that has been flipped up, the support block 9 also moves down as the fixing block 8 is pressed down, until the support block 9 contacts the upper surface of the support rod 93. The top rod 95 is connected to and slides on the upper and lower support blocks 9. The diameter of the two ends of the top rod 95 corresponding to the top block 91 is larger than the diameter of the part sliding inside the support block 9. Thus, when the steel shell body 1 is fitted onto the support block 9, as the steel shell body 1 and the support block 9 are pressed down by the fixing block 8, the top rod 95 will move down synchronously. At this time, the support block 9 located below is already at the farthest distance it can move down under the limit of the support rod 93. Thus, the top rod 95 can push the large cylindrical battery that has been completed on the support block 9 out of the support block 9 and drop it out of the feeding port 76, completing the automatic feeding operation.

[0045] By setting a first compression spring 83 between the limiting block 82 and the fixing block 8, the limiting block 82 will first form a preliminary clamping of the insulating gasket A3, rubber gasket 4, insulating gasket B5 and copper sheet 6 with the limiting block 92 before the fixing block 8 contacts the ejector pin 205. This avoids the situation where the gap between the insulating gasket A3, rubber gasket 4, insulating gasket B5 and copper sheet 6 is too large or the parts are tilted and stuck during manual assembly and installation, which would cause the parts to be damaged during riveting. The bottom surface of the fixing block 8 located inside the circular slide 81 is lower than the bottom surface of the fixing block 8 located outside the circular slide 81, so that there can be a certain gap between the fixing block 8 and the limiting block 82 during riveting. This avoids the problem that the first compression spring 83 is compressed too much and puts too much pressure on the limiting block 82, which would damage the parts below.

[0046] By setting a limiting block 92 on the top block 91, the limiting block 92 is inserted into the riveting hole 204. The limiting block 92 and the riveting hole 204 have a slight interference fit. On the one hand, the interference fit of the insertion can complete the auxiliary fixation of the large cylindrical battery. On the other hand, the limiting block 92 restricts the downward movement of the ejector pin 205, which can ensure the riveting depth of the ejector pin 205 each time.

[0047] When using the device, the user first places the collection device below the discharge port 76, then assembles the large cylindrical parts and places them on the support block 9. The cylinder 73 is then activated to move the fixing block 8 down for riveting. During the resetting process of the fixing block 8 after riveting, the ratchet plate 85 drives the ratchet gear 751 and the base plate 74 to rotate. The user can then continue to place the large cylindrical battery on the support block 9. During the second riveting process, the push rod 95 pushes the riveted large cylindrical battery from the support block 9 and it falls into the collection device. Finally, the large cylindrical battery is made by filling the steel shell body 1 with the electrolyte 102 and installing the battery cells, and then sealing the bottom of the steel shell body 1.

[0048] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. An apparatus for manufacturing a large cylindrical battery having a riveted structure current collector plate and a steel can, comprising a support table (7), characterized in that, Also include: The support plate (71) is rotatably connected with a rotating shaft (75), and the rotating shaft (75) is fixedly connected with a bottom plate (74); the two surfaces of the bottom plate (74) are fixedly connected with support rods (93); The support rod (93) is slidably connected with a support block (9), and the support block (9) is fixedly connected with a top block (91); the top block (91) is used to support the base disc (201); The support frame (72) is fixedly connected with a cylinder (73) on the support table (7), and the output end of the cylinder (73) is fixedly connected with a fixed block (8); A circular slide groove (81) is formed in the fixed block (8), and a limiting clamping block (82) is slidably connected in the circular slide groove (81); the bottom of the limiting clamping block (82) is provided with a chamfer to assist in limiting the steel shell body (1); The fixed block (8) is fixedly connected with a connecting rod (84), and the connecting rod (84) is slidably connected with a limiting rod (851); the limiting rod (851) is fixedly connected with a ratchet plate (85), and the second compression spring (852) is connected between the ratchet plate (85) and the connecting rod (84); The rotating shaft (75) is fixedly connected with a ratchet gear (751), and the ratchet gear (751) is engaged with the ratchet plate (85); the number of ratchets on the ratchet plate (85) is half of the number of ratchets on the ratchet gear (751); The top rod (95) is slidably connected with the bottom plate (74) and the support block (9); the third compression spring (94) is connected between the support block (9) and the bottom plate (74); when the support block (9) above the bottom plate (74) is subjected to pressure and moves downward, the steel shell body (1) is extruded to move downward and is pushed out from the support block (9) below.

2. The apparatus for manufacturing a large cylindrical battery having a riveted structure collector plate and a steel can according to claim 1, wherein The first compression spring (83) is connected between the fixed block (8) and the limiting clamping block (82); the limiting block (92) is fixedly connected to the top block (91); when the fixed block (8) extrudes the bottom of the thimble (205) and contacts the limiting block (92), riveting is completed.

3. The apparatus for manufacturing a large cylindrical battery having a riveted structure collector plate and a steel can according to claim 1, wherein The support table (7) is provided with a discharging port (76), and the position of the discharging port (76) corresponds to the position of the support block (9); the discharging port (76) is used to receive the large cylindrical battery falling from the support block (9).

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