A bending method, a bending shaping process, and a bending apparatus for an arc-shaped battery

Abstract

The application provides a bending method, a bending shaping process and a bending device for arc-shaped batteries, wherein the bending method specifically comprises the following steps: conveying the batteries by a belt at a first speed; vertically pressing and contacting the belt by a pressing roller which is actively rotated along an axis thereof at a second speed, the advancing direction of the belt being opposite to the rotating direction of the pressing roller; the batteries gradually pass through the gap between the belt and the pressing roller in the advancing direction of the belt, and the batteries are formed into batteries with a certain arc after being rubbed and extruded by the belt and the pressing roller; and the arc of the batteries is changed by changing the speed difference between the first speed and the second speed. The application breaks the limitation of traditional stamping equipment that the bending arc of the batteries is less than 180°, and the arc-shaped batteries can be shaped in one step by one-time rolling. By adjusting the speed difference between the pressing roller and the belt, batteries with different arcs can be shaped, and the structure is simple and applicable.

Description

Technical Field

[0001] This invention relates to the field of battery processing and manufacturing technology, and more specifically, to a bending method, bending and shaping process, and bending equipment for an arc-shaped battery. Background Technology

[0002] Due to their excellent spatial adaptability, curved batteries can be smaller and thinner than traditional batteries, while also possessing a certain degree of curvature. Curved batteries have changed the existing battery design concept, enabling the battery to bend while maintaining its electrical performance. This allows for applications in wearable devices, such as bracelets and watch straps, where they can adapt to the close-fitting shapes designed for these electronic devices. Currently, traditional curved batteries are made by applying pressure to square batteries using curved clamps, forcing the batteries to bend and causing the electrode plates to bend.

[0003] Existing methods for forming curved batteries often employ multiple rotating structures and rolling extrusion molding of the battery, or multiple stamping devices for multiple stamping molding. For example, Chinese patent literature discloses a curved battery rolling molding machine, which includes a support mechanism, a rolling mechanism for placing the battery to be processed on the base of the support mechanism, and a pressing mechanism located above the support mechanism and corresponding to the rolling mechanism. The pressing mechanism can cooperate with the rolling mechanism to roll the battery to be processed; the battery is bent and stamped using a processing mode in which upper and lower rollers cooperate.

[0004] However, all these curved battery bending schemes have a common problem: they are limited by the structural constraints when two or more rotating structures are squeezed together. That is, the bending arc of the curved battery cannot be greater than 180°, and it can only be bent into batteries with a target specification arc within 180°. Summary of the Invention

[0005] The purpose of this invention is to overcome the limitation of existing arc bending schemes, which restrict the bending radius of batteries to within 180°, and to provide a bending method, bending and shaping process, and bending equipment for arc batteries. This invention breaks through the limitation of traditional stamping equipment that restricts the bending radius of batteries to less than 180°. This invention can shape arc batteries in a single rolling motion. By adjusting the speed difference between the pressure roller and the belt, batteries with different curvatures can be shaped. The invention has a simple structure and strong applicability.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0007] A method for bending an arc-shaped battery specifically includes the following steps:

[0008] The battery is transported at the first speed via a belt;

[0009] The pressure roller, which rotates actively along its own axis at a second speed, presses down vertically and contacts the belt. The direction of the belt's forward movement is opposite to the direction of the pressure roller's rotation.

[0010] The battery gradually passes through the gap between the belt and the pressure roller in the forward direction of the belt, and is formed into a battery with a certain curvature after being rubbed and squeezed by the belt and the pressure roller.

[0011] The curvature of the battery can be changed by altering the speed difference between the first and second speeds.

[0012] It should be noted that this invention uses a combination of belt and pressure rollers to roll the battery, eliminating the need for multiple stamping or rolling devices as in traditional curved battery bending methods. Because the belt deforms under the pressure of the rollers, it can accommodate various batteries with the same width but different arc lengths. This significantly reduces tooling and changeover costs and improves production efficiency when producing such curved battery products. Furthermore, this invention uses the belt and rollers to create friction between the upper and lower surfaces of the battery. The speed difference between the rollers and belt creates different frictional forces on the upper and lower surfaces, resulting in different rates of deformation and bending. This principle allows for targeted adjustment of the battery's arc size by controlling the speed difference between the first and second speeds, without being limited to 180°, demonstrating significant practical value.

[0013] Furthermore, the belt undergoes an arc deformation at the point where the pressure roller presses down on the battery. The first velocity is the angular velocity ω1 converted at the arc deformation point, and the second velocity is the angular velocity ω2 of the pressure roller.

[0014] Furthermore, the conversion method for angular velocity ω1 is as follows:

[0015] ω1=V / (r+T)

[0016] Where V is the linear velocity of the belt, r is the radius of the pressure roller, and T is the thickness of the battery.

[0017] Furthermore, when the winding radius of the battery is the same as the radius of the pressure roller, the angular velocities ω1 and ω2 satisfy the following relationship: ω2=A*ω1, where A is a variable parameter.

[0018] It should be noted that when the pressure roller presses down, the point of contact between the belt and the battery can be considered as being on a concentric circle with the pressure roller. The radius of the point of contact between the belt and the battery is r+T. Converting the linear velocity V of the belt to an angular velocity ω1, and using the angular velocities ω2 of the pressure roller and ω1 of the belt as a reference, theoretically, when their velocities are equal (ω1 = ω2), the upper and lower sides of the battery will be squeezed and rubbed into an arc shape at the same speed. At this point, the inner diameter of the wound battery under pressure is approximately the same as the radius r of the pressure roller. Increasing ω2 further results in ω2 > ω1. At ω1, the centripetal force increases due to the increased angular velocity of the pressure roller on the upper surface of the pressed battery, thus increasing the degree to which the pressed battery curls inward, and consequently increasing the arc of the pressed battery. If ω1 is reduced, because the pressed battery is under the pressure of the pressure roller and belt, the angular velocity between the lower side of the pressed battery and the belt is less than the angular velocity between the upper side of the pressed battery and the pressure roller. The friction between the lower side of the pressed battery and the belt will increase, and this increased friction will become the resistance to the deformation and bending of the pressed battery into an arc shape, thus the finished arc shape will become smaller.

[0019] It should also be noted that in actual production, due to the different materials of the pressure roller, belt, and battery, the friction between them is also different. Furthermore, the internal materials of the battery vary, resulting in different resistance to deformation. Therefore, in actual production, a variable parameter A needs to be introduced. The value of A will be manually set according to specific conditions based on factors such as equipment and product materials. That is, when ω2 = A * ω1, it is in equilibrium, and the inner diameter of the wound battery under pressure is consistent with the radius of the pressure roller.

[0020] Furthermore, the second speed is greater than the first speed.

[0021] It should be noted that, since the pressure roller and belt rotate in opposite directions, when the battery enters the gap between the pressure roller and belt, it can be quickly clamped by both and pushed in the forward direction of the belt. Since the lower surface of the battery will have a longer curvature than the upper surface, this means that the lower surface of the battery needs greater friction to ensure that the final deformation of the battery is uniform and to reduce damage to the battery surface. If the second speed of the pressure roller is less than the first speed of the belt, the upper surface of the battery will be subjected to greater friction. However, due to the shape of the pressure roller, the friction will cause obvious wrinkles in the aluminum-plastic film on the upper surface of the battery, which may damage the battery. Therefore, this invention limits the second speed of the pressure roller to be greater than the first speed of the belt. This ensures the bending effect and prevents damage to the battery during bending deformation, thereby improving product quality and product qualification rate.

[0022] The present invention also provides an arc-shaped battery bending and shaping process, which, using the above-mentioned arc-shaped battery bending method, further includes cutting a battery with a certain curvature, placing the cut-out battery in a hot-pressing shaping fixture, and removing it from the hot-pressing shaping fixture after surface hot pressing.

[0023] Furthermore, it also includes fine-shaping the arc-shaped battery taken out of the hot-pressing shaping jig to obtain the finished arc-shaped battery.

[0024] The present invention also provides an arc-shaped battery bending device for realizing the above-mentioned arc-shaped battery bending method, including a belt, a first driving device connected to the belt and used to drive the belt to move, a pressure roller located above the belt and rotatable along its own axis, a second driving device with its output end connected to the pressure roller and driving the pressure roller to rotate along its own axis, and a lifting device connected to the second driving device and driving the pressure roller to reciprocate in the vertical direction; the rotation direction of the pressure roller is opposite to the forward direction of the belt.

[0025] Furthermore, the lifting device includes a bracket mounted on one side of the belt, a pressing cylinder fixed on the bracket, and a mounting plate connected to the output end of the pressing cylinder. The mounting plate reciprocates in the vertical direction under the drive of the pressing cylinder, and the second drive device is fixed on the mounting plate.

[0026] Furthermore, it also includes a sensor located at the feeding end of the belt for sensing battery position information, and a control system that is connected to the sensor, the first drive unit, the second drive unit and the pressing cylinder respectively.

[0027] It should be noted that in the production process of curved battery projects, it is often necessary to produce batteries with different widths and different forming curvatures, which correspond to different forming diameters and curvature requirements. The rotating mechanisms of the equipment are highly targeted. This invention breaks through by adopting a relative extrusion cooperation method of pressure rollers and belts to achieve the extrusion bending of the battery. The conveyor belt of this invention can be adapted to batteries of various specifications within its width range. The upper and lower surfaces of the pressed battery deform at different rates under the differential speed of the pressure rollers and belts, thereby achieving the bending of the battery. When producing such curved battery products, the equipment of this invention can greatly save tooling and changeover costs, improve production efficiency, and also break through the limitation of traditional stamping equipment that the forming curvature of the battery is limited to within 180°. This invention can achieve the shaping of batteries with different curvatures by adjusting the forward speed of the belt and the rotation speed of the pressure rollers.

[0028] Compared with the prior art, the beneficial effects of the present invention are:

[0029] (1) The present invention uses a combination of belt and pressure roller to roll the battery, which does not require multiple stamping or rolling devices as in the traditional curved battery bending method. Since the belt can deform under the pressure of the pressure roller, it can be compatible with the shaping of various batteries with the same width but different arc lengths. When producing such curved battery products, it can greatly save tooling and changeover costs and improve production efficiency.

[0030] (2) The present invention uses a belt and a pressure roller to create friction on the upper and lower surfaces of the battery. By utilizing the speed difference between the pressure roller and the belt, the friction force on the upper and lower surfaces of the battery is different, which leads to different rates of deformation on the upper and lower surfaces of the battery. Therefore, the battery under pressure bends and rolls up. Using this principle, by adjusting the speed difference between the first speed and the second speed, the curvature of the battery can be changed in a targeted manner. Moreover, the curvature is not limited to 180°, which has great practical value. Attached Figure Description

[0031] Figure 1 This is a flowchart of the arc-shaped battery bending method in Embodiment 1 of this application;

[0032] Figure 2 This is a schematic diagram of the bending process of the arc-shaped battery in Embodiment 1 of this application;

[0033] Figure 3 This is a process flow diagram of the arc-shaped battery bending and shaping process in Embodiment 2 of this application;

[0034] Figure 4 This is a schematic diagram of the arc-shaped battery bending device in Embodiment 3 of this application.

[0035] The markings in the diagram are explained below:

[0036] 1-Belt, 10-First drive unit, 2-Pressure roller, 20-Second drive unit, 3-Lifting device, 31-Bracket, 32-Pressing cylinder, 33-Mounting plate, 100-Battery. Detailed Implementation

[0037] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0038] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0039] Example 1

[0040] like Figure 1 and 2 As shown, a method for bending an arc-shaped battery specifically includes the following steps:

[0041] The battery 100 is transported at a first speed via belt 1;

[0042] The pressure roller 2, which rotates actively along its own axis at a second speed, presses down vertically and contacts the belt 1. The forward direction of the belt 1 is opposite to the rotation direction of the pressure roller 2.

[0043] The battery 100 gradually passes through the gap between the belt 1 and the pressure roller 2 in the forward direction of the belt 1. After being rubbed and squeezed by the belt 1 and the pressure roller 2, the battery 100 is formed with a certain curvature.

[0044] The curvature of battery 100 is changed by altering the speed difference between the first and second speeds.

[0045] It should be noted that this embodiment uses a combination of belt 1 and pressure roller 2 to roll the battery 100, eliminating the need for multiple stamping or rolling devices as in traditional curved battery bending methods. Since belt 1 deforms under the pressure of pressure roller 2, it can accommodate various batteries 100 with the same width but different arc lengths. This significantly reduces tooling and changeover costs and improves production efficiency when producing such curved battery products. Furthermore, this embodiment uses belt 1 and pressure roller 2 to create friction between the upper and lower surfaces of the battery 100. The speed difference between pressure roller 2 and belt 1 results in different frictional forces on the upper and lower surfaces of the battery 100, leading to different rates of deformation. This causes the battery 100 to bend and coil. Utilizing this principle, by adjusting the speed difference between the first and second speeds, the arc of the battery 100 can be specifically altered, and this arc is not limited to 180°, demonstrating significant practical value.

[0046] like Figure 2 As shown, the belt 1 undergoes an arc deformation at the point where the pressure roller 2 presses down on the battery 100. The first velocity is the angular velocity ω1 converted at the arc deformation point, and the second velocity is the angular velocity ω2 of the pressure roller 2.

[0047] In this embodiment, the conversion method of angular velocity ω1 is as follows:

[0048] ω1=V / (r+T)

[0049] Where V is the linear velocity of belt 1, r is the radius of pressure roller 2, and T is the thickness of battery 100.

[0050] In this embodiment, when the winding radius of the battery 100 is the same as the radius of the pressure roller 2, the angular velocity ω1 and angular velocity ω2 satisfy the following relationship: ω2=A*ω1, where A is a variable parameter.

[0051] It should be noted that when the pressure roller 2 presses down, the contact point between the belt 1 and the battery 100 can be considered to be on a concentric circle with the pressure roller 2. The radius of the contact point between the belt 1 and the battery 100 is r+T. Converting the linear velocity V of the belt 1 to an angular velocity ω1, and taking the angular velocity ω2 of the pressure roller 2 and the angular velocity ω1 of the belt 1 as a reference, theoretically, when their velocities are equal (ω1 = ω2), the upper and lower sides of the battery 100 will be squeezed and rubbed into an arc shape at the same speed. At this time, the inner diameter of the battery 100 under pressure is approximately the same as the radius r of the pressure roller 2. Increasing ω2, when ω2 > ω1, the pressure... The centripetal force on the upper surface of the battery 100 increases due to the increased angular velocity of the pressure roller 2, thus increasing the degree to which the pressure battery 100 curls inward, and consequently increasing the curvature of the coiled battery 100. If ω1 is reduced, since the pressure battery 100 is squeezed by the pressure roller 2 and the belt 1, the angular velocity between the lower side of the pressure battery 100 and the belt 1 is less than the angular velocity between the upper side of the pressure battery 100 and the pressure roller 2. The friction between the lower side of the pressure battery 100 and the belt 1 will increase. This increased friction will become the resistance to the deformation and bending of the pressure battery 100 into an arc shape, thus the finished arc shape will become smaller.

[0052] It should also be noted that in actual production, due to the different materials of the pressure roller 2, belt 1, and battery 100, the friction between them is also different, and the internal material of battery 100 is different and its resistance to deformation is also different. Therefore, in actual production, a variable parameter A needs to be introduced. The value of A will be set manually according to the specific situation based on relevant factors such as equipment and product material; that is, when ω2=A*ω1, it is in equilibrium state, and the inner diameter of the pressed battery 100 is consistent with the radius of the pressure roller 2.

[0053] In this embodiment, the second speed is set to be greater than the first speed.

[0054] It should be noted that, since the pressure roller 2 and belt 1 rotate in opposite directions, when the battery 100 enters the gap between the pressure roller 2 and belt 1, it can be quickly clamped by the two and pushed in the forward direction of belt 1. Since the lower surface of the battery 100 will have a longer curvature than the upper surface, this means that the lower surface of the battery 100 needs greater friction to ensure that the final deformation of the battery 100 is uniform and to reduce damage to the surface of the battery 100. If the second speed of the pressure roller 2 is less than the first speed of the belt 1, the upper surface of the battery 100 will be subjected to greater friction. However, due to the shape of the pressure roller 2, the friction will cause obvious wrinkles on the aluminum-plastic film on the upper surface of the battery 100, which may damage the battery 100. Therefore, in this embodiment, the second speed of the pressure roller 2 is limited to be greater than the first speed of the belt 1. This ensures the bending effect and prevents damage to the battery 100 during bending deformation, thereby improving product quality and product qualification rate.

[0055] Example 2

[0056] like Figure 3 As shown, an arc-shaped battery bending and shaping process applies the arc-shaped battery bending method described in Example 1 above, and further includes cutting a battery 100 with a certain curvature, placing it in a hot-pressing shaping fixture after cutting, and taking it out of the hot-pressing shaping fixture after surface hot pressing.

[0057] In this embodiment, the arc-shaped battery removed from the hot-pressing shaping fixture is further refined to obtain the finished arc-shaped battery.

[0058] Example 3

[0059] like Figure 4 As shown, an arc-shaped battery bending device is used to implement the arc-shaped battery bending method described in Embodiment 1 above. It includes a belt 1, a first drive device 10 connected to the belt 1 and used to drive the belt 1 to move, a pressure roller 2 located above the belt 1 and rotatable along its own axis, a second drive device 20 whose output end is connected to the pressure roller 2 and drives the pressure roller 2 to rotate along its own axis, and a lifting device 3 connected to the second drive device 20 and driving the pressure roller 2 to reciprocate in the vertical direction; the rotation direction of the pressure roller 2 is opposite to the forward direction of the belt 1.

[0060] like Figure 4 As shown, the lifting device 3 includes a bracket 31 mounted on one side of the belt 1, a pressing cylinder 32 fixed on the bracket 31, and a mounting plate 33 connected to the output end of the pressing cylinder 32. The mounting plate 33 reciprocates in the vertical direction under the drive of the pressing cylinder 32, and the second drive device 20 is fixed on the mounting plate 33.

[0061] This embodiment also includes a sensor located at the feeding end of the belt 1 for sensing the position information of the battery 100, and a control system connected to the sensor, the first drive device 10, the second drive device 20, and the pressing cylinder 32. The sensor can promptly obtain the forward position of the flat battery 100 on the belt 1. In cooperation with the lifting device 3, the lifting device 3 can push the mounting plate 33 to press down in time after the flat battery 100 is in position, realizing the squeezing friction of the pressure roller 2 and the belt 1 on the battery 100, and realizing the intelligent and automated production of the arc-shaped battery.

[0062] It should be noted that in the production process of curved battery projects, it is often necessary to produce batteries with different widths and different forming curvatures, which correspond to different forming diameters and curvature requirements. The rotating mechanisms of the equipment are highly targeted. This embodiment innovatively adopts a relative extrusion cooperation method between the pressure roller 2 and the belt 1 to achieve the extrusion bending of the battery. The conveyor belt of this embodiment can be adapted to multiple specifications of batteries 100 within its width range. The upper and lower surfaces of the pressed battery 100 deform at different rates under the differential speed of the pressure roller 2 and the belt 1, thereby achieving the bending of the battery. When producing such curved battery products, the equipment of this embodiment can greatly save tooling and changeover costs, improve production efficiency, and also break through the limitation of the forming curvature of batteries in traditional stamping equipment, which is limited to within 180°. This embodiment can achieve the shaping of batteries with different curvatures by adjusting the forward speed of the belt 1 and the rotation speed of the pressure roller 2.

[0063] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A method for bending an arc-shaped battery, characterized in that, Specifically, the following steps are included: The battery (100) is transported at a first speed via belt (1); The pressure roller (2), which rotates actively along its own axis at a second speed, presses down vertically and contacts the belt (1), the forward direction of the belt (1) being opposite to the rotation direction of the pressure roller (2); The battery (100) gradually passes through the gap between the belt (1) and the pressure roller (2) in the forward direction of the belt (1), and forms a battery (100) with a certain curvature after being rubbed and squeezed by the belt (1) and the pressure roller (2). The curvature of the battery (100) is changed by altering the speed difference between the first and second speeds.

2. The method for bending an arc-shaped battery according to claim 1, characterized in that, The belt (1) undergoes an arc deformation at the point where the pressure roller (2) presses down on the battery (100). The first speed is the angular velocity ω1 converted at the arc deformation point, and the second speed is the angular velocity ω2 of the pressure roller (2).

3. The method for bending an arc-shaped battery according to claim 2, characterized in that, The conversion method for the angular velocity ω1 is as follows: ω1=V / (r+T) Where V is the linear velocity of the belt (1), r is the radius of the pressure roller (2), and T is the thickness of the battery.

4. The method for bending an arc-shaped battery according to claim 2, characterized in that, When the winding radius of the battery (100) is the same as the radius of the pressure roller (2), the angular velocity ω1 and angular velocity ω2 satisfy the following relationship: ω2=A*ω1, where A is a variable parameter.

5. The method for bending an arc-shaped battery according to claim 1, characterized in that, The second speed is greater than the first speed.

6. A process for bending and shaping an arc-shaped battery, using the arc-shaped battery bending method as described in any one of claims 1-5, characterized in that, It also includes cutting the battery (100) with a certain curvature into a hot pressing and shaping fixture, and then taking it out of the hot pressing and shaping fixture after surface hot pressing.

7. The arc-shaped battery bending and shaping process according to claim 6, characterized in that, It also includes fine-shaping the arc-shaped battery taken out of the hot-pressing shaping jig to obtain the finished arc-shaped battery.

8. An arc-shaped battery bending device for implementing the arc-shaped battery bending method as described in any one of claims 1-5, characterized in that, The device includes a belt (1), a first drive device (10) connected to the belt (1) and used to drive the belt (1) to move, a pressure roller (2) located above the belt (1) and rotatable along its own axis, a second drive device (20) whose output end is connected to the pressure roller (2) and drives the pressure roller (2) to rotate along its own axis, and a lifting device (3) connected to the second drive device (20) and drives the pressure roller (2) to reciprocate in the vertical direction; the rotation direction of the pressure roller (2) is opposite to the forward direction of the belt (1).

9. The arc-shaped battery bending device according to claim 8, characterized in that, The lifting device (3) includes a bracket (31) mounted on one side of the belt (1), a pressing cylinder (32) fixed on the bracket (31), and a mounting plate (33) connected to the output end of the pressing cylinder (32). The mounting plate (33) reciprocates in the vertical direction under the drive of the pressing cylinder (32), and the second driving device (20) is fixed on the mounting plate (33).

10. The arc-shaped battery bending device according to claim 9, characterized in that, It also includes a sensor located at the feeding end of the belt (1) for sensing the position information of the battery (100), and a control system that is connected to the sensor, the first drive device (10), the second drive device (20) and the pressing cylinder (32) respectively.

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