Rolling sealing device for cylindrical batteries

Abstract

This invention provides a rolling sealing device for cylindrical batteries. The rolling sealing device includes an upper mechanism and a lower mechanism. The upper mechanism includes an upper mold base and two sets of upper mold assemblies. The upper mold base rotates about a first rotation axis coaxial with the central axis of the cylindrical battery. The two sets of upper mold assemblies are spaced apart on both sides of the first rotation axis of the upper mold base. Each set of upper mold assemblies includes an upper mold support fixedly connected to the upper mold base and an upper mold rotatably connected to the upper mold support. The upper mold rotates about a second rotation axis perpendicular to the first rotation axis. Each upper mold has a molding surface. From the radially outer side to the radially inner side of the cylindrical battery, the molding surface is an inclined surface that gradually reduces the thickness of the upper mold along the axial direction. By setting the specific structure of the rolling sealing device, damage to the opening end of the casing is reduced, the generation of foreign matter is reduced, the mold life is increased, and it has significant advantages on mass production lines.

Description

Technical Field

[0001] This utility model relates to the field of batteries, and in particular to a rolling sealing device for cylindrical batteries. Background Technology

[0002] In recent years, with the rapid development of electric vehicles, consumer electronics, and new energy storage systems, battery technology has become an important factor in the development of electric vehicles.

[0003] In the development of battery technology, how to improve the yield rate of batteries is a technical problem that urgently needs to be solved. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the above-mentioned technical problems of the prior art and provide a rolling sealing device for cylindrical batteries.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] A rolling sealing device for a cylindrical battery, characterized in that it comprises: an upper mechanism and a lower mechanism, wherein the lower mechanism is used to fix the cylindrical battery to be sealed, and the upper mechanism is located along the axial direction of the cylindrical battery on the side of the cylindrical battery with a cover plate.

[0007] The upper mechanism includes: an upper mold base and two sets of upper mold components;

[0008] The upper mold base rotates around a first rotation axis, and the first rotation axis is coaxial with the central axis of the cylindrical battery.

[0009] Two sets of upper mold assemblies are spaced apart on both sides of the first rotation axis, and each set of upper mold assemblies includes an upper mold support and an upper mold. The upper mold support is fixedly connected to the upper mold base, and the upper mold is rotatably connected to the upper mold support. The upper mold rotates around a second rotation axis, which is perpendicular to the first rotation axis. Each upper mold has a molding surface facing the end face of the cylindrical battery casing. The molding surfaces of the upper molds of the two sets of upper mold assemblies are respectively located on both sides of the first rotation axis and are symmetrically arranged. From the radially outer side to the radially inner side of the cylindrical battery, the molding surface is an inclined surface that makes the thickness of the upper mold gradually decrease along the axial direction.

[0010] In this technical solution, by setting a specific structure for the rolling sealing device, the open end of the cylindrical battery casing is processed using a rolling downward pressing sealing method. This reduces the hard friction between the mold and the open end of the casing, thereby reducing damage to the open end, reducing the generation of foreign objects, increasing mold life, improving battery yield, and offering significant advantages on mass production lines. Specifically, the rotation of the upper mold base drives the upper mold assembly to actively rotate at high speed and press down, causing the molding surface of the upper mold to contact the open end of the cylindrical battery casing. Simultaneously, the upper mold assembly rotates along the first rotation axis while contacting the open end, and the upper mold passively rotates under the sliding friction force of the open end. It can be understood that the contact and passive rotation of the upper mold with the open end can alleviate the hard metal friction at the contact surface of the two metal structures, thereby reducing energy loss, surface wear, and heat generation. During the pressing process, the molding surface of the upper mold contacts the open end of the shell to roll and seal, thereby achieving the sealing of the open end of the shell by rolling and pressing.

[0011] Preferably, the upper mechanism further includes a pressure head assembly, which includes a pressure rod and a pressure head connected to the pressure rod. The central axis of the pressure rod and the central axis of the pressure head are coaxial with the first rotation axis. The upper mold is located on the two opposite sides of the pressure head, and the pressure head is used to press against the cover plate of the cylindrical battery.

[0012] Preferably, the upper mold assembly further includes:

[0013] An upper mold mounting rod is rotatably connected to the upper mold bracket, and the rotation axis of the upper mold mounting rod is coaxial with the second rotation axis. The upper mold is fixed to one end of the upper mold mounting rod near the pressure head.

[0014] The first bearing and the second bearing are both located between the upper mold mounting rod and the upper mold support, and are spaced apart along the axial direction of the upper mold mounting rod.

[0015] Preferably, the pressure bar and / or the pressure head can extend and retract relative to the upper mold base along the axial direction.

[0016] Preferably, along the axial direction, the end of the pressure rod away from the upper mold base is provided with a mounting portion for mounting the pressure head;

[0017] The pressure head assembly also includes an elastic structure, which is sleeved on the pressure rod. The outer edge of the pressure rod is provided with an outwardly protruding limiting part. One end of the elastic structure is connected to the limiting part, and the other end is connected to the mounting part, and applies a force to the mounting part to move it away from the limiting part.

[0018] Preferably, the pressure head assembly further includes: a bearing housing, a third bearing, and a fourth bearing. The third bearing and the fourth bearing are both located between the bearing housing and the pressure rod, and are spaced apart along the axial direction of the pressure rod. The third bearing is located close to the upper mold base, and the fourth bearing is located away from the upper mold base. The bearing housing is sleeved around the third bearing and the fourth bearing, and one end of the bearing housing is connected to the upper mold base.

[0019] Preferably, the lower mechanism includes:

[0020] Base;

[0021] A mold assembly is mounted on the base and can switch between a first position for fixing the cylindrical battery and a second position for releasing the cylindrical battery. The mold assembly includes multiple molds spaced apart circumferentially along the cylindrical battery. Each mold includes a fixing part and an extension part. The fixing part extends radially along the cylindrical battery for fixing the cylindrical battery, and the extension part extends axially toward a direction away from the upper mechanism.

[0022] A transmission assembly is disposed below the base along the axial direction;

[0023] A drive component is connected to the transmission component, and drives the card mold component to switch from the second position to the first position through the transmission component;

[0024] An elastic reset element acts on the card mold assembly, causing the card mold assembly to switch from the first position to the second position.

[0025] Preferably, the outer side of the extension of the card mold near the end of the transmission assembly is provided with a first inclined surface;

[0026] The transmission assembly includes a clamping sleeve, and the inner ring of the clamping sleeve is provided with a second inclined surface that cooperates with the first inclined surface.

[0027] Preferably, the transmission assembly further includes: a guide component and a follower component;

[0028] The guide component is connected between the bottom of the mold sleeve and the follower component;

[0029] The end of the follower component away from the guide component is connected to the drive assembly.

[0030] Preferably, the drive assembly includes two drive members, which are respectively disposed on both sides of the guide member, and the follower member is disposed corresponding to the drive members.

[0031] The positive and progressive effects of this utility model are as follows:

[0032] This invention, through the specific structure of the rolling sealing device, enables the processing of the open end of the cylindrical battery casing by rolling downward sealing, reducing the hard friction between the mold and the open end of the casing, thereby reducing damage to the open end of the casing, reducing the generation of foreign objects, increasing the life of the mold, improving the yield of the battery, and having significant advantages on the mass production line. Attached Figure Description

[0033] Figure 1 This is a cross-sectional view of a cylindrical battery in the prior art.

[0034] Figure 2 A cross-sectional structural diagram of a cylindrical battery being manufactured using a sealing device in the prior art.

[0035] Figure 3 This is a cross-sectional view of a preferred embodiment of the cylindrical battery rolling sealing device of the present invention.

[0036] Figure 4 This is a cross-sectional view of the upper mechanism of the rolling sealing device for a cylindrical battery according to a preferred embodiment of the present invention.

[0037] Figure 5 This is a cross-sectional view of the cylindrical battery before the cylindrical battery is processed, according to a preferred embodiment of the present invention.

[0038] Figure 6 This is a cross-sectional view of the cylindrical battery rolling sealing device according to a preferred embodiment of the present invention during the processing of a cylindrical battery.

[0039] Explanation of reference numerals in the attached figures

[0040] Figure 1 In the middle: cylindrical battery 3; cell 31; casing 32; cover plate 33; terminal post 34; open end 35.

[0041] Figure 2 In the middle: cylindrical battery 3; shell 32; open end 35; sealing device 4; base 41; four-claw mold 42; spring 44; spring rod 43; guide cylinder 45; upper mold 46; mold sleeve 47.

[0042] Figures 3 to 6Middle: 1. Rolling sealing device for cylindrical batteries; 10. Upper mechanism; 11. Upper mold base; 12. Press head assembly; 122. Press head; 121. Mounting rod; 1211. Limiting part; 1212. Elastic structure; 123. Bearing seat; 124. Third bearing; 125. Fourth bearing; 126. Upper mold assembly; 13. Upper mold support; 131. Upper mold; 132. Inclined surface; 1321. Upper mold mounting rod; 133. First bearing; 134. Second bearing; 135. 5; Lower mechanism 20; Base 21; Mold assembly 22; Mold 221; Fixing part 222; Extension part 223; First inclined surface 2211; Transmission assembly 23; Mold sleeve 231; Second inclined surface 2311; Guide component 232; Follower component 233; Drive assembly 24; Drive component 241; Elastic reset component 25; Spring rod 27; Cover 28; Cylindrical battery 3; Housing 32; Cover plate 33; Open end 35. Detailed Implementation

[0043] The present invention will be described more clearly and completely below with reference to the accompanying drawings, using a preferred embodiment.

[0044] like Figure 1 As shown, the cylindrical battery 3 in the prior art mainly includes: a battery cell 31, positive and negative electrode adapters, a casing 32, and a cover plate 33. The battery cell 31 is assembled using stacking or winding technology, and a positive electrode tab and a negative electrode tab are formed at its ends. The positive and negative electrode adapters are connected to the positive and negative electrode tabs of the battery cell 31, respectively. One end of the casing 32 has a riveted terminal post 34, and the other end is an open end 35 before sealing. The battery cell 31 is placed inside the casing 32, the terminal post 34 is connected to the positive electrode adapter, and the negative electrode adapter is connected to the casing wall of the casing 32. Electrolyte is then injected into the battery. The open end 35 of the casing 32 is mechanically sealed using the cover plate 33.

[0045] In existing technologies, cylindrical batteries are primarily sealed using a mechanical pressing method. The grooving sealing process is a widely used packaging technology in battery manufacturing. Before the pressing sealing process, a grooving process is required. The rollers of the grooving machine press against the open end 35 of the cylindrical battery casing 32, causing plastic deformation of the casing 32 and forming an annular groove. This fixes the battery cell 31 inside the casing 32, while simultaneously fastening the cover plate 33 to the open end 35 of the casing 32. Then, through the pressing sealing process, the sealing device completes the connection with the casing 32. At this point, the pressure at the outer edge of the cover plate 33 is greater than the compressive stress received at its center.

[0046] like Figure 2As shown, the sealing device 4 includes: a base 41, a four-claw clamping mold 42, a spring rod 43, a spring 44, a guide cylinder 45, an upper mold 46, and a clamping mold sleeve 47. Along the height direction H, the four-claw clamping mold 42 is movably mounted on the base 41 and can switch between a first position for fixing the cylindrical battery 3 and a second position for releasing the cylindrical battery 3. Along the height direction H, the vertically movable clamping mold sleeve 47 acts on the four-claw clamping mold 42 during its downward movement, causing the four-claw clamping mold 42 to switch from the second position to the first position. The spring 44 connects the spring rod 43 and the clamping mold 221, causing the four-claw clamping mold 42 to switch from the first position to the second position. The upper mold 46 is fixed inside the clamping mold sleeve 231 and is used to press down on the open end 35 of the casing 32 of the cylindrical battery 3, which is fixed by the four-claw clamping mold 42.

[0047] During processing, the clamping sleeve 47 moves downward, causing the upper mold 46 to descend. The clamping sleeve 47 uses its inclined slope to close the four-jaw clamping mold 42 (switching from the second position to the first position), clamping the cylindrical battery 3. The clamping sleeve 47 continues to move downward, causing the upper mold 46 to continue descending. The upper mold 46 contacts the open end 35 of the housing 32 (the upper mold 46 and the housing 32 are both metal), and performs sliding metal-to-metal hard friction on the open end 35 to achieve sealing. It can be understood that when two metal surfaces undergo metal-to-metal hard friction, because metal surfaces usually have high hardness, when two metal surfaces directly contact and slide relative to each other, a large frictional force is generated. This frictional force not only leads to energy loss but may also cause surface wear and heat generation.

[0048] It can be seen that this type of mold performs sliding metal-hard friction on the open end of the shell, which causes significant damage to the open end of the shell during processing, increases foreign matter, and seriously affects the mold life, greatly reducing the mold life and failing to meet the high requirements of mass production.

[0049] Therefore, there is an urgent need to provide a new type of sealing device to improve the yield of batteries and meet the needs of mass production industrialization of cylindrical batteries.

[0050] like Figures 3 to 6 As shown, this embodiment provides a rolling sealing device 1 for a cylindrical battery. The rolling sealing device includes an upper mechanism 10 and a lower mechanism 20. The lower mechanism 20 is used to fix the cylindrical battery 3 to be sealed. The upper mechanism 10 is located on the side of the cylindrical battery 3 with a cover plate 33 along the axial direction O of the cylindrical battery 3.

[0051] The upper mechanism 10 includes an upper mold base 11 and two sets of upper mold assemblies 13. The upper mold base 11 rotates around a first rotation axis P, which is coaxial with the central axis of the cylindrical battery 3.

[0052] Two sets of upper mold assemblies 13 are spaced apart on both sides of the first rotation axis P. Each set of upper mold assemblies 13 includes an upper mold support 131 and an upper mold 132. The upper mold support 131 is fixedly connected to the upper mold base 11, and the upper mold 132 is rotatably connected to the upper mold support 131. The upper mold 132 rotates around a second rotation axis Q, which is perpendicular to the first rotation axis P. Each upper mold 132 has a molding surface 1321 facing the end face of the housing 32 of the cylindrical battery 3. The molding surfaces 1321 of the upper molds 132 of the two sets of upper mold assemblies 13 are located on both sides of the first rotation axis P and are symmetrically arranged. From the outer side of the radial direction R of the cylindrical battery 3 to the inner side of the radial direction R, the molding surface 1321 is an inclined surface that makes the thickness of the upper mold 132 gradually decrease along the axial direction O.

[0053] In this way, by setting the specific structure of the cylindrical battery rolling sealing device 1, the open end of the cylindrical battery casing is processed by rolling and pressing sealing, reducing the hard friction between the mold and the open end of the casing, thereby reducing damage to the open end of the casing, reducing the generation of foreign objects, increasing the life of the mold, improving the yield of the battery, and having a significant advantage on the mass production line. Specifically, the rotation of the upper mold base 11 drives the upper mold assembly 13 to rotate actively at high speed and press down so that the molding surface 1321 of the upper mold 132 contacts the open end 35 of the casing 32 of the cylindrical battery 3. While the upper mold assembly 13 rotates along the first rotation axis P, the upper mold 132 contacts the open end 35, causing the upper mold 132 to rotate passively under the driving force of the sliding friction of the open end 35. It can be understood that the contact and passive rotation of the upper mold 132 with the open end 35 can alleviate the hard metal friction at the contact surface of the two metal structures, thereby reducing energy loss, and also reducing surface wear and heat generation. During the pressing process, the molding surface 1321 of the upper mold 132 contacts the opening end 35 of the housing 32 for rolling sealing, thereby achieving sealing of the opening end of the housing by rolling pressing. Specifically, by setting the molding surface 1321 to be an inclined surface with a gradually decreasing thickness along the axial direction O from the outer side of the radial direction R of the cylindrical battery 3 to the inner side of the radial direction R, on the one hand, it can effectively guide the bending of the sealing end 35 of the cylindrical battery 3 during rolling sealing; on the other hand, it can further reduce the damage to the sealing end 35 caused by friction. Furthermore, the upper mold 132 is made of metal.

[0054] The upper mechanism 10 also includes a pressure head assembly 12, which includes a pressure rod 121 and a pressure head 122 connected to the pressure rod 121. The central axis of the pressure rod 121 and the central axis of the pressure head 122 are coaxially arranged with the first rotation axis P. The upper mold 132 is located on the two opposite sides of the pressure head 122. The pressure head 122 is used to press against the cover plate 33 of the cylindrical battery 3. In this way, by the pressure head 122 pressing against the cover plate 33 of the cylindrical battery 3, the cover plate 33 is limited, thereby preventing it from affecting the rolling seal of the opening end 35. It should be noted that the upper mold base 11 rotates around the first rotation axis P, and the central axis of the pressure rod 121 and the central axis of the pressure head 122 are coaxially arranged with the first rotation axis P. That is, the upper mold base 11 rotates around the central axis of the pressure rod 121. This can be achieved by setting the upper mold base 11 to be rotatably connected to the pressure rod 121, that is, the upper mold base 11 rotates around the pressure rod 121 as the axis of rotation, or it can be achieved in other ways.

[0055] Specifically, the upper mold assembly 13 further includes: an upper mold mounting rod 133, a first bearing 134, and a second bearing 135. The upper mold mounting rod 133 is rotatably connected to the upper mold support 131, and the rotation axis of the upper mold mounting rod 133 is coaxial with the second rotation axis Q. The upper mold 132 is fixed to the end of the upper mold mounting rod 133 near the pressure head 122. The first bearing 134 and the second bearing 135 are both located between the upper mold mounting rod 133 and the upper mold support 131, and are spaced apart along the axial direction of the upper mold mounting rod 133. In this way, the upper mold 132 passively rotates with the upper mold mounting rod 133 as the rotation axis. By setting the first bearing 134 and the second bearing 135, interference between the rotation of the upper mold 132 and the rotation of the upper mold support 131 with the rotation of the upper mold base 11 is avoided.

[0056] In this embodiment, the pressure head 122 can extend and retract relative to the upper mold base 11 along the axial direction O, which is achieved by the pressure head 122 being movably connected to the pressure rod 121. This provides a certain buffering effect when the pressure head 122 abuts against the cover plate, thereby preventing damage to the cover plate. However, this is not a limitation. In other embodiments, the pressure head 122 can be fixedly connected to the pressure rod 121, and the overall extension and retraction can be achieved by the pressure rod extending and retracting relative to the upper mold base 11 along the axial direction O; alternatively, both the pressure rod 121 and the pressure head 122 can extend and retract relative to the upper mold base 11 along the axial direction O.

[0057] Along the axial direction O, the end of the pressure rod 121 away from the upper mold base 11 is provided with a mounting portion 1211 for mounting the pressure head 122. The pressure head assembly 12 also includes an elastic structure 123, which is sleeved on the outside of the pressure rod 121. The outer edge of the pressure rod 121 is provided with an outwardly protruding limiting portion 1212. One end of the elastic structure 123 is connected to the limiting portion 1212, and the other end is connected to the mounting portion 1211, applying a force to the mounting portion 1211 to move it away from the limiting portion 1212. In this way, by providing the elastic structure 123, the pressure head 122 can return to its original position after leaving the cover plate 33 of the cylindrical battery 3. Specifically, the elastic structure 123 is a spring, but it is not limited to this, and can also be other components with elastic restoring force.

[0058] Preferably, the pressure head assembly 12 further includes a bearing housing 124, a third bearing 125, and a fourth bearing 126. The third bearing 125 and the fourth bearing 126 are both located between the bearing housing 124 and the pressure rod 121, and are spaced apart along the axial direction of the pressure rod 121. The third bearing 125 is located closer to the upper mold base 11, and the fourth bearing 126 is located further away from the upper mold base 11. The bearing housing 124 is sleeved around the third bearing 125 and the upper mold base 11, and one end of the bearing housing 124 is connected to the upper mold base 11. This arrangement prevents the pressure rod 121 from rotating with the upper mold base 11, maintaining the stability of the pressure head 122 located at the lower end of the pressure rod 121 when pressing the cover plate, and preventing the flatness of the pressure head 122 from affecting the stability of the assembly of the cover plate 33 of the cylindrical battery 3.

[0059] Preferably, the lower mechanism 20 includes a base 21 and a mold assembly 22. The mold assembly 22 is mounted on the base 21 and can be switched between a first position for fixing the cylindrical battery and a second position for releasing the cylindrical battery.

[0060] The mold assembly 22 includes multiple molds 221, which are spaced apart along the circumference of the cylindrical battery 3. In this embodiment, there are four molds 221, and the four molds 221 are equidistantly spaced along the circumference of the cylindrical battery 3. However, this is not a limitation; in other embodiments, the number of molds 221 can be two, three, five, or other quantities. The multiple molds 221 can be equidistantly spaced along the circumference of the cylindrical battery 3 or not, and can be adjusted according to design requirements. Preferably, the multiple molds 221 are equidistantly spaced along the circumference of the cylindrical battery 3 to form a uniform force for fixing the cylindrical battery 3.

[0061] The mold 221 includes a fixing part 222 and an extension part 223. The fixing part 222 extends radially R along the cylindrical battery 3 and is used to fix the cylindrical battery R. The extension part 223 extends axially O in a direction away from the upper mechanism 10. It should be noted that, compared with the prior art, the extension part 223 of the mold 221 is changed from extending upward to extending downward. This can make way for the pressure head 122 while fixing the cylindrical battery 3, and at the same time increase the contact area between the extension part 223 and the housing 32 of the cylindrical battery 3, thereby improving the stability of fixing the cylindrical battery 3.

[0062] Preferably, the lower mechanism 20 further includes a transmission assembly 23, a drive assembly 24, and an elastic reset member 25. The transmission assembly 23 is disposed below the base 21 along the height direction H. The drive assembly 24 is connected to the transmission assembly 23 and drives the mold clamping assembly 22 from the second position to the first position via the transmission assembly 23. The elastic reset member 25 acts on the mold clamping assembly 22, driving the mold clamping assembly 22 from the first position to the second position. Specifically, the elastic reset member 25 is a spring, but is not limited to this, and can also be other components with elastic restoring force. The mold clamping assembly 22 also includes a spring rod 27, with the spring connecting the spring rod 27 and the mold clamp 221, causing the mold clamp 221 to switch from the first position to the second position.

[0063] The extension 223 of the mold 221 has a first inclined surface 2211 on its outer side near the end of the transmission assembly 23. That is, the outer side of the end of the first part of the mold 221 away from the second part has the first inclined surface 2211. The transmission assembly 23 includes a mold sleeve 231, and the inner ring of the mold sleeve 231 has a second inclined surface 2311 that cooperates with the first inclined surface 2211. In this way, through the cooperating first inclined surface 2211 and second inclined surface 2311, the mold 221 can move inward along a preset path, for example, accurately ensuring the coaxiality of the positioning, thereby effectively and accurately fixing the cylindrical battery 3.

[0064] The transmission assembly 23 also includes a guide component 232 and a follower component 233; the guide component 232 is connected between the bottom of the mold sleeve 231 and the follower component 233; the end of the follower component 233 away from the guide component 232 is connected to the drive assembly 24.

[0065] The drive assembly 24 includes two drive members 241, which are respectively disposed on both sides of the guide member 232, and the follower member 233 is disposed corresponding to the drive members 241. Specifically, the drive member 241 is a cylinder, and the free end of the cylinder is connected to the follower member 233.

[0066] The lower mechanism 20 also includes a cover 28, which covers the base 21 and the mold assembly 22 along the height direction H.

[0067] Please refer to the following: Figure 5 and Figure 6 The specific working process of this embodiment is as follows:

[0068] Step 1, mold assembly 22 closes into position: After the battery is placed in position, the cylinder retracts, driving the follower component 233 and guide component 232 connected to the cylinder to rise upward along the axial direction O. The mold sleeve 231 is lifted, and by using the cooperation of the second inclined surface 2311 of the mold sleeve 231 and the first inclined surface 2211 of the mold 221, the four molds 221 arranged at intervals along the circumference of the cylindrical battery 3 are closed and hold the cylindrical battery 3 tightly (the mold 221 moves from the second position to the first position) to fix the cylindrical battery 3. The end of the mold 221 facing the cylindrical battery 3 is provided with a positioning protrusion, and the battery is provided with a groove corresponding to the position of the positioning protrusion. When the mold 221 is in the first position, the positioning protrusion enters the groove.

[0069] The second step is to press down the upper mold 132 to seal the opening: The upper mold base 11 of the upper mechanism 10 of the rolling sealing device rotates around the pressure rod 121 as the rotation axis, driving the upper mold assembly 13 to rotate actively at high speed and press down so that the upper mold 132 contacts the opening end 35 of the cylindrical battery 3's casing 32, causing the upper mold 132 to rotate passively. At the same time, the pressure head 122 abuts against the cover plate of the cylindrical battery, limiting the cover plate 33. During the pressing process, the upper mold 132 contacts the opening end 35 of the cylindrical battery 3's casing 32 to perform rolling sealing.

[0070] The third step is demolding after rolling sealing: After the opening end 35 of the cylindrical battery 3's casing 32 is rolled sealed, the upper mold base 11 of the upper mechanism 10 of the rolling sealing device drives the upper mold 132 away from the cylindrical battery 3. The cylinder of the lower mechanism 20 of the rolling sealing device extends, driving the follower component 233 and the guide component 232 to descend. The mold sleeve 231 will follow and descend. The spring (elastic reset component 25) pulls the four molds 221 back to their original positions (the molds 221 move from the first position to the second position), and the cylindrical battery 3 is demolded.

[0071] This embodiment, by setting the specific structure of the cylindrical battery rolling sealing device 1, realizes the processing of the opening end 35 of the cylindrical battery 3 housing 32 by rolling and pressing sealing, reducing the hard friction of the mold on the opening end 35 of the housing 32, thereby reducing the damage to the opening end 35 of the housing 32, reducing the generation of foreign objects, increasing the life of the mold, improving the yield of the battery, and having a significant advantage on the mass production line.

[0072] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A rolling seal device for a cylindrical battery, characterized by comprising: It includes: the upper part The upper mechanism and the lower mechanism are used to fix the cylindrical battery to be sealed, and the upper mechanism is located along the axial direction of the cylindrical battery on the side of the cylindrical battery with the cover plate. The upper mechanism includes: an upper mold base and two sets of upper mold components; The upper mold base rotates around a first rotation axis, and the first rotation axis is coaxial with the central axis of the cylindrical battery. Two sets of upper mold assemblies are spaced apart on both sides of the first rotation axis, and each set of upper mold assemblies includes an upper mold support and an upper mold. The upper mold support is fixedly connected to the upper mold base, and the upper mold is rotatably connected to the upper mold support. The upper mold rotates around a second rotation axis, which is perpendicular to the first rotation axis. Each upper mold has a molding surface facing the end face of the cylindrical battery casing. The molding surfaces of the upper molds of the two sets of upper mold assemblies are respectively located on both sides of the first rotation axis and are symmetrically arranged. From the radially outer side to the radially inner side of the cylindrical battery, the molding surface is an inclined surface that makes the thickness of the upper mold gradually decrease along the axial direction.

2. The rolling seal apparatus for a cylindrical battery according to claim 1, wherein The upper mechanism also includes a pressure head assembly, which includes a pressure rod and a pressure head connected to the pressure rod. The central axis of the pressure rod and the central axis of the pressure head are coaxial with the first rotation axis. The upper mold is located on the two opposite sides of the pressure head. The pressure head is used to press against the cover plate of the cylindrical battery.

3. A rolling seal apparatus for a cylindrical battery as defined in claim 2, wherein The upper mold assembly also includes: The upper mold mounting rod is rotatably connected to the upper mold bracket, and the rotation axis of the upper mold mounting rod is coaxial with the second rotation axis. The upper mold is fixed to the end of the upper mold mounting rod near the pressure head. The first bearing and the second bearing are both located between the upper mold mounting rod and the upper mold support, and are spaced apart along the axial direction of the upper mold mounting rod.

4. The rolling seal apparatus for cylindrical batteries as recited in claim 2, wherein The pressure bar and / or the pressure head can extend and retract relative to the upper mold base along the axial direction.

5. The rolling seal apparatus for cylindrical batteries as recited in claim 4, wherein Along the axial direction, the end of the pressure rod away from the upper mold base is provided with a mounting part for mounting the pressure head; The pressure head assembly also includes an elastic structure, which is sleeved on the pressure rod. The outer edge of the pressure rod is provided with an outwardly protruding limiting part. One end of the elastic structure is connected to the limiting part, and the other end is connected to the mounting part, and applies a force to the mounting part to move it away from the limiting part.

6. A rolling seal apparatus for a cylindrical battery as defined in claim 5, wherein The pressure head assembly further includes: a bearing housing, a third bearing, and a fourth bearing. The third bearing and the fourth bearing are both located between the bearing housing and the pressure rod, and are spaced apart along the axial direction of the pressure rod. The third bearing is located close to the upper mold base, and the fourth bearing is located away from the upper mold base. Along the axial direction, one end of the bearing housing is located between the third bearing and the upper mold base, and the other end abuts against the limiting part.

7. The rolling seal apparatus for cylindrical batteries of claim 1, wherein The lower mechanism includes: Base; A mold assembly is mounted on the base and can switch between a first position for fixing the cylindrical battery and a second position for releasing the cylindrical battery. The mold assembly includes multiple molds spaced apart circumferentially along the cylindrical battery. Each mold includes a fixing part and an extension part. The fixing part extends radially along the cylindrical battery for fixing the cylindrical battery, and the extension part extends axially toward a direction away from the upper mechanism. A transmission assembly is disposed below the base along the axial direction; A drive component is connected to the transmission component, and drives the card mold component to switch from the second position to the first position through the transmission component; An elastic reset element acts on the card mold assembly, causing the card mold assembly to switch from the first position to the second position.

8. The rolling seal apparatus for cylindrical batteries as recited in claim 7, wherein The outer side of the extension of the card mold near the end of the transmission assembly is provided with a first inclined surface; The transmission assembly includes a clamping sleeve, and the inner ring of the clamping sleeve is provided with a second inclined surface that cooperates with the first inclined surface.

9. A rolling seal apparatus for a cylindrical battery as defined in claim 8, wherein The transmission assembly further includes: a guide component and a follower component; The guide component is connected between the bottom of the mold sleeve and the follower component; The end of the follower component away from the guide component is connected to the drive assembly.

10. The rolling sealing device for a cylindrical battery as described in claim 9, characterized in that, The drive assembly includes two drive members, which are respectively disposed on both sides of the guide member, and the follower member is disposed corresponding to the drive members.

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