Pole ear folding device and pole ear folding equipment for reverse-wound battery cell

Abstract

The present application provides a tab folding device and a tab folding equipment for a reverse-wound battery cell. The tab folding device for the reverse-wound battery cell includes a base, a battery cell positioning assembly, a battery cell pressing mechanism and a tab bending mechanism. The battery cell positioning assembly includes a positioning member, and the positioning member is connected to the base. The battery cell pressing mechanism includes a first bracket, a pressing member and a first driving assembly, the first bracket is connected to the base, the first driving assembly is respectively connected to the first bracket and the pressing member, and the first driving assembly is used to drive the pressing member to approach or move away from the positioning member. The tab of the battery cell is bent by a fixed bending member and a movable bending member, so that the tab forms a first folding angle at the connection between the side and the end face of the battery cell, and a second folding angle is formed at the winding center of the battery cell, thereby completing the tab folding operation of the battery cell. Since the tab folding operation is automatically performed by the tab folding device, the speed of tab folding is effectively improved, thereby improving the production efficiency of the battery cell and the bending quality of the tab.

Description

Technical Field

[0001] The present invention relates to the technical field of battery production and processing equipment, and in particular to a pole ear folding device and pole ear folding equipment for a reverse-rolled battery cell. Background Art

[0002] Driven by the market, lithium-ion batteries have developed rapidly and are widely used in information, smart wearables, electronics, and medical fields. As one of the cells of lithium-ion batteries, the reverse-wound cell has a larger space utilization rate. Under the same volume, the density of the wound pole piece of the reverse-wound cell is higher, which makes the reverse-wound cell have a larger power reserve.

[0003] The tabs of the reverse-wound battery cell are located at the outermost side of the winding core. In order to make the aluminum-plastic film wrapping the battery cell have sufficient strength, facilitate the processing of the aluminum-plastic film, and improve the sealing of the top seal in the aluminum-plastic film packaging process, the tabs of the reverse-wound battery cell need to be bent so that the tabs are bent to the center of the end of the winding core. However, the traditional tab folding process of the reverse-wound battery cell mainly relies on manual operation, which is extremely unstable and inaccurate, while increasing labor costs and reducing the production efficiency of the reverse-wound battery cell. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a device and equipment for folding the pole tabs of a reverse-wound battery cell, which can automatically bend the pole tabs of the reverse-wound battery cell, and can improve the battery production efficiency of the reverse-wound battery cell.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] A folding lug device for a reverse-wound battery cell, comprising:

[0007] Base;

[0008] A battery cell positioning assembly, the battery cell positioning assembly comprising a positioning member, the positioning member being connected to the base;

[0009] A battery cell pressing mechanism, the battery cell pressing mechanism comprising a first bracket, a pressing piece and a first driving assembly, the first bracket being connected to the base, the first driving assembly being arranged on the first bracket, and a power output end of the first driving assembly being connected to the pressing piece, the pressing piece being arranged opposite to the positioning piece, and the first driving assembly being used to drive the pressing piece to approach or move away from the positioning piece;

[0010] The ear bending mechanism includes a second bracket, a fixed bending part, a movable bending part and a second driving component, the second bracket is respectively connected to the base and the fixed bending part, the fixed bending part is arranged adjacent to the positioning part, the second driving component is arranged on the second bracket, and the power output end of the second driving component is connected to the movable bending part, the movable bending part is arranged opposite to the fixed bending part, and the second driving component is used to drive the movable bending part to approach or move away from the fixed bending part.

[0011] In one embodiment, the positioning member is provided with a plurality of positioning grooves, and the plurality of positioning grooves are arranged side by side.

[0012] In one embodiment, the battery cell positioning assembly also includes a positioning adjustment member, which is slidably connected to the base and slides toward or away from the positioning member, and each positioning groove is located between the positioning adjustment member and the fixed bending member.

[0013] In one embodiment, the pressing part includes a connecting plate, a compression spring and a pressing plate, the connecting plate is connected to the power output end of the first driving component, the pressing plate is slidably connected to the connecting plate, the compression spring is located between the connecting plate and the pressing plate, and the two ends of the compression spring are respectively abutted against the pressing plate and the connecting plate.

[0014] In one embodiment, the pressing plate also includes a pressing plate body, a connecting column and a clamping block, the pressing plate body is connected to the connecting column, the connecting plate is provided with a through hole, the connecting column is passed through the through hole and is slidably connected to the connecting plate, the clamping block is located on the side of the connecting plate away from the pressing plate body, and the clamping block is connected to the connecting column, the compression spring is sleeved on the connecting column, and the two ends of the compression spring are respectively abutted against the connecting plate and the pressing plate body, and the clamping block is used to abut against the side of the connecting plate away from the pressing plate when the compression spring is in a natural state.

[0015] In one embodiment, the pressing piece is slidably connected to the first bracket.

[0016] In one embodiment, the battery cell pressing mechanism further includes a sliding connection component, the sliding connection component includes a slide rail and a slider, the slide rail is connected to the first bracket, the slider is connected to the pressing piece, and the slide rail is slidably connected to the slider.

[0017] In one embodiment, the fixed bending member is detachably connected to the second bracket.

[0018] In one embodiment, the second bracket is provided with an elongated hole, the fixed bent piece is provided with a threaded hole, the threaded hole is connected to the elongated hole, the fixed bent piece includes a threaded fastener, the threaded fastener passes through the elongated hole, and the threaded fastener is screwed into the threaded hole, and one end of the threaded fastener abuts against a side of the second bracket away from the fixed bent piece.

[0019] A pole ear folding device comprises the pole ear folding device of the reverse-wound battery cell described in any one of the above embodiments.

[0020] Compared with the prior art, the present invention has at least the following advantages:

[0021] 1. The movable bending member moves towards the direction close to the fixed bending member under the drive of the second driving component. The movable bending member will contact the pole ear of the battery cell during the movement. After the movable bending member contacts the pole ear, it drives the pole ear to bend in the direction close to the fixed bending member, so that the pole ear forms a first angle at the connection between the side and the end face of the battery cell. The movable bending member continues to move toward the fixed bending member, driving the pole ear to continue to bend. When the movable bending member abuts against the fixed bending member, since the bending plane of the fixed bending member is exactly located at the winding center of the battery cell, the pole ear will form a second angle at the winding center of the battery cell, thus completing the automatic folding of the pole ear of the battery cell. Since the folding of the pole ear is automatically performed by the folding device, the speed of folding the pole ear is effectively improved, thereby improving the production efficiency of the battery cell and the bending quality of the pole ear.

[0022] 2. The pressing piece not only abuts against the battery cell to fix the battery cell on the positioning piece, but also can continue to press down after the pressing piece abuts against the battery cell, so that the battery cell is deformed under pressure, and the rolled battery cell changes from a round shape to an elliptical shape, thereby reducing the thickness of the battery cell, so that the thickness of the battery cell slot on the aluminum-plastic film wrapping the battery cell can also be reduced accordingly. In this way, when the battery cell slot of the aluminum-plastic film is stamped, the stamping thickness of the aluminum-plastic film can be reduced, so that the strength of the aluminum-plastic film is higher and the battery cell can be better protected; in addition, the reduction in the thickness of the battery cell helps to make the battery cell lighter and thinner as a whole, and can make the appearance of the battery and the product using the battery more beautiful. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0024] Figure 1Schematic diagram of the structure of a folding lug device of a reverse-wound battery cell in one embodiment;

[0025] Figure 2 for Figure 1 A schematic structural diagram of the folding ear device of the reverse-wound battery cell from another perspective;

[0026] Figure 3 for Figure 1 A schematic structural diagram of the folded pole ear device of the reverse-wound battery cell from another perspective;

[0027] Figure 4 for Figure 1 A schematic structural diagram of a tab bending mechanism of a tab folding device of a reverse-wound battery cell is shown;

[0028] Figure 5 for Figure 1 The structure schematic diagram of the pole tab bending mechanism of the pole tab folding device of the reverse-wound battery cell shown in FIG. DETAILED DESCRIPTION

[0029] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0030] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0032] like Figure 1As shown, a tab folding device 10 for a reverse-rolled battery cell of an embodiment includes a base 100, a battery cell positioning assembly 200, a battery cell pressing mechanism 300, and a tab bending mechanism 400. The battery cell positioning assembly 200 includes a positioning member 210, and the positioning member 210 is connected to the base 100. The battery cell pressing mechanism 300 includes a first bracket 310, a pressing member 320, and a first driving assembly 330, wherein the first bracket 310 is connected to the base 100, the first driving assembly 330 is disposed on the first bracket 310, and the power output end of the first driving assembly 330 is connected to the pressing member 320, the pressing member 320 is disposed opposite to the positioning member 210, and the first driving assembly 330 is used to drive the pressing member 320 to approach or move away from the positioning member 210. The ear bending mechanism 400 includes a second bracket 410, a fixed bending piece 420, a movable bending piece 430 and a second driving component 440. The second bracket 410 is respectively connected to the base 100 and the fixed bending piece 420. The fixed bending piece 420 is arranged adjacent to the positioning piece 210. The second driving component 440 is arranged on the second bracket 410, and the power output end of the second driving component 440 is connected to the movable bending piece 430. The movable bending piece 430 is arranged opposite to the fixed bending piece 420. The second driving component 440 is used to drive the movable bending piece 430 to move closer to or away from the fixed bending piece 420.

[0033] In this embodiment, the battery cell positioning assembly 200 includes a positioning member 210, which is mounted on the base 100. The positioning member 210 is used to place the battery cell and plays an auxiliary role in fixing the battery cell. The battery cell pressing mechanism 300 includes a first bracket 310, a pressing member 320 and a first driving assembly 330. The first bracket 310 is mounted on the base 100. The first driving assembly 330 is mounted on the first bracket 310. The pressing member 320 is connected to the first driving assembly 330. The pressing member 320 is opposite to the positioning member 210. The first driving assembly 330 is specifically a first cylinder and a first air pump. The first cylinder is connected to the first air pump and the pressing member 320 respectively. The first driving assembly 330 is used to drive the pressing member 320 to move so that the pressing member 320 moves toward or away from the positioning member 210. The ear bending mechanism 400 includes a second bracket 410, a fixed bending piece 420, a movable bending piece 430 and a second driving assembly 440. The second bracket 410 is installed on the base 100. The second bracket 410 is used to be connected to the second driving assembly 440 and the fixed bending piece 420 respectively. The second driving assembly 440 is connected to the movable bending piece 430. The fixed bending piece 420 is located at an adjacent position of the positioning piece 210. The movable bending piece 430 is opposite to the fixed bending piece 420. The second driving assembly 440 is specifically a cylinder and an air pump. The cylinder is connected to the air pump and the movable bending piece 430 respectively. The second driving assembly 440 is used to drive the movable bending piece 430 to move so that the movable bending piece 430 moves toward or away from the fixed bending piece 420.

[0034] Furthermore, before folding the tabs, the battery cell needs to be placed in the positioning member 210. Since the fixed bending member 420 is located adjacent to the positioning member 210, the battery cell is positioned on the positioning member 210, and the tabs of the battery cell are located between the fixed bending member 420 and the movable bending member 430. In order to allow the tabs to be located at the winding center of the battery cell after bending, the bending plane of the fixed bending member 420 is located exactly at the winding center of the battery cell. Therefore, when placing the battery cell in the positioning member 210, the battery cell needs to be adjusted so that the tabs of the battery cell are located between the fixed bending member 420 and the movable bending member 430, and the tabs of the battery cell are close to the movable bending member 430, so that the movable bending member 430 can effectively bend the tabs of the battery cell during the movement relative to the fixed bending member 420. The process of the folding lug device folding the lug of the reverse-rolled battery cell is as follows: first, the battery cell is positioned on the positioning member 210; then, the pressing member 320 is driven by the first driving component 330 to move toward the direction close to the positioning member 210, and when the pressing member 320 contacts the battery cell, the pressing member 320 stops moving, so that the battery cell is completely fixed under the positioning effect of the positioning member 210 and the pressing effect of the pressing member 320, which helps to make the battery cell more stable when the lug of the battery cell is bent, thereby ensuring the quality of the lug bending; then, the movable bending member 430 is driven by the second driving component 440 to move toward the fixed bending member 42 0, the movable bending member 430 will contact the pole ear of the battery cell during the movement, and after the movable bending member 430 contacts the pole ear, it drives the pole ear to bend in the direction close to the fixed bending member 420, so that the pole ear forms a first fold angle at the connection between the side and the end face of the battery cell, and the movable bending member 430 continues to move toward the fixed bending member 420, driving the pole ear to continue to bend. When the movable bending member 430 abuts against the fixed bending member 420, since the bending plane of the fixed bending member 420 is exactly located at the winding center of the battery cell, the pole ear will form a second fold angle at the winding center of the battery cell, thus completing the folding of the pole ear of the battery cell.

[0035] Furthermore, the pressing piece 320 can not only abut the battery cell to fix the battery cell on the positioning piece 210, but also after the pressing piece 320 abuts against the battery cell, the pressing piece 320 can continue to press down, so that the battery cell is deformed under pressure, and the rolled battery cell changes from a round shape to an elliptical shape, thereby reducing the thickness of the battery cell. Correspondingly, the thickness of the battery cell slot on the aluminum-plastic film wrapping the battery cell can also be reduced accordingly, that is, when the battery cell slot of the aluminum-plastic film is stamped, the stamping thickness can be reduced, so that the strength of the aluminum-plastic film is higher and the protection effect on the battery cell is better; in addition, the reduction in the thickness of the battery cell helps to make the battery cell as a whole thinner and lighter, and can make the appearance of the battery and the product using the battery more beautiful.

[0036] like Figure 2As shown, in one embodiment, the positioning member 210 is provided with a plurality of positioning grooves 211, and the plurality of positioning grooves 211 are arranged side by side. The positioning member 210 is used to place the battery cell and limit the rolling of the battery cell to ensure that the battery cell can remain stable during the bending of the pole ear. In this embodiment, the positioning member 210 includes a plurality of positioning grooves 211, and one end of each positioning groove 211 is opposite to the position of the fixed bending member 420. When the battery cell is placed in the positioning groove 211, the groove wall of the positioning groove 211 can limit the rolling of the battery cell to keep the position of the battery cell stable. When the battery cell is placed in the positioning groove 211, the pole ear of the battery cell extends from one end of the positioning groove 211 and extends into between the fixed bending member 420 and the movable bending member 430, and the placement operation of the battery cell is completed.

[0037] like Figure 2 As shown, in one embodiment, the battery cell positioning assembly 200 further includes a positioning adjustment member 220, which is slidably connected to the base 100, and the positioning adjustment member 220 slides in a direction close to or away from the positioning member 210, and each of the positioning grooves 211 is located between the positioning adjustment member 220 and the fixed bending member 420. The positioning adjustment member 220 is equivalent to the groove wall of the positioning groove 211. When the battery cell is placed in the positioning groove 211, one end of the battery cell is adjacent to the fixed bending member 420, and the other end is abutted against the positioning adjustment member 220, so that the positions of each battery cell can be arranged neatly; the positioning adjustment member 220 is slidably connected to the base 100, and through the distance between the positioning adjustment member 220 and the positioning groove 211, it can adapt to batteries of different lengths, so that the tab extension ends of batteries of different lengths can be just located at the adjacent position of the fixed bending member 420, so as to obtain a good effect, that is, the adaptability of the tab folding device is stronger, and the tab folding operation can be performed on batteries of different lengths.

[0038] like Figure 3As shown, in one embodiment, the pressing member 320 includes a connecting plate 321, a compression spring 323 and a pressing plate 322, the connecting plate 321 is connected to the power output end of the first driving component 330, the pressing plate 322 is slidably connected to the connecting plate 321, the compression spring 323 is located between the connecting plate 321 and the pressing plate 322, and the two ends of the compression spring 323 are respectively abutted against the pressing plate 322 and the connecting plate 321. The pressing piece 320 can not only fix the battery cell, but also compress the battery cell to reduce the thickness of the battery cell. When the pressing piece 320 is pressed downward, the first driving component 330 drives the connecting plate 321 to move downward, and the connecting plate 321 drives the compression spring 323 and the pressing plate 322 to move downward. When the pressing plate 322 contacts the battery cell, the pressing plate 322 fixes the battery cell. At this time, the pressing plate 322 stops moving downward, while the connecting plate 321 continues to move downward, and the compression spring 323 is compressed, thereby applying elastic force to the pressing plate 322. The pressure compresses the battery cell to reduce the thickness of the battery cell. Since the pressing force on the battery cell comes from the elastic force of the compression spring 323, the pressure on the battery cell can be more relaxed, preventing the pressure on the battery cell from being too strong during rigid downward pressure, which may damage the internal structure of the battery cell.

[0039] like Figure 3As shown, in one embodiment, the pressing plate 322 also includes a pressing plate body 322a, a connecting column 322b and a blocking block 322c, the pressing plate body 322a is connected to the connecting column 322b, the connecting plate 321 is provided with a through hole, the connecting column 322b is passed through the through hole and is slidably connected to the connecting plate 321, the blocking block 322c is located on the side of the connecting plate 321 away from the pressing plate body 322a, and the blocking block 322c is connected to the connecting column, the compression spring 323 is sleeved on the connecting column 322b, and the two ends of the compression spring 323 are respectively abutted against the connecting plate 321 and the pressing plate body 322a, and the blocking block 322c is used to abut against the side of the connecting plate 321 away from the pressing plate when the compression spring 323 is in a natural state. The connecting plate 321 and the pressing plate 322 are also connected by a connecting column 322b, and the connecting column 322b includes a connecting column and a block 322c. One end of the connecting column is fixedly connected to the pressing plate 322, and the other end is penetrated by a through hole of the connecting plate 321. The end of the connecting column penetrating the connecting plate 321 is connected to the block 322c. When the pressing member 320 is not working, the connecting plate 321 and the pressing plate 322 are separated from each other due to the elastic force of the compression spring 323. When they are separated to a certain distance, When the distance is close, the block 322c of the connecting column 322b will abut against the connecting plate 321, preventing the connecting plate 321 and the pressing plate 322 from continuing to separate, so as to maintain the relative position of the connecting plate 321 and the pressing plate 322. When the pressing piece 320 is working, the connecting column 322b can also play a guiding role, so that the connecting plate 321 and the pressing plate 322 move along the axial direction of the connecting column 322b, thereby improving the stability of the pressing piece 320 when pressing down, and thus having a better pressing effect on the battery cell.

[0040] like Figure 3 As shown, in one embodiment, the pressing piece 320 is slidably connected to the first bracket 310. The pressing piece 320 is displaced toward or away from the positioning piece 210 under the action of the first driving assembly 330. In order to enhance the stability of the pressing piece 320 during displacement, in this embodiment, the pressing piece 320 is slidably connected to the first bracket 310. Since the first bracket 310 is fixed on the base 100 and the pressing piece 320 is slidably connected to the first bracket 310, when the pressing piece 320 is working, the pressing piece 320 can be displaced along the sliding connection direction with the first bracket 310 under the drive of the first driving assembly 330, so that the movement process of the pressing piece 320 is more stable, and the stability of the pressing piece 320 when pressed down is improved, thereby having a better pressing effect on the battery cell.

[0041] like Figure 3As shown, in one embodiment, the battery pressing mechanism 300 further includes a sliding connection component 340, the sliding connection component 340 includes a slide rail 342 and a slider 341, the slide rail 342 is connected to the first bracket 310, the slider 341 is connected to the pressing piece 320, and the slide rail 342 is slidably connected to the slider 341. The pressing piece 320 is slidably connected to the first bracket 310. In this embodiment, the battery pressing mechanism 300 further includes a sliding connection component 340, the pressing piece 320 slides with the first bracket 310 through the sliding connection component 340, the pressing piece 320 is connected to the slider 341, the first is connected to the slide rail 342, and the slide rail 342 is slidably connected to the slider 341. Through the action of the slider 341 and the slide rail 342, the pressing piece 320 can move along the length direction of the slide rail 342, and then be slidably connected to the first bracket 310.

[0042] like Figure 4 As shown, in one embodiment, the fixed bending piece 420 is detachably connected to the second bracket 410. Since the thickness of different types of battery cells is different, the distance between the winding center of the battery cell and the outermost side of the battery cell is also different. In addition, since the bending plane of the fixed bending piece 420 needs to be located at the corresponding position of the winding center of the battery cell during the folding of the pole ear, when folding the pole ear of the battery cell of different thicknesses, it is necessary to adjust the position of the fixed bending piece 420 to adapt to the battery cells of different thicknesses. In this embodiment, the fixed bending piece 420 is slidably connected to the second bracket 410, and the relative position relationship between the fixed bending piece 420 and the second bracket 410 can be changed, so that the bending plane of the fixed bending piece 420 is located at the corresponding position of the winding center of the battery cell, and the pole ear folding operation can be performed on battery cells of various different thicknesses, so that the adaptability of the pole ear folding device is improved.

[0043] like Figure 5As shown, in one embodiment, the second bracket 410 is provided with a long hole 411, and the fixed bent member 420 is provided with a threaded hole, and the threaded hole is connected to the long hole 411. The fixed bent member 420 includes a threaded fastener 421, and the threaded fastener 421 passes through the long hole 411, and the threaded fastener 421 is screwed into the threaded hole, and one end of the threaded fastener 421 abuts against the side of the second bracket 410 away from the fixed bent member 420. The fixed bending piece 420 is slidably connected to the second bracket 410 to change the position of the fixed bending piece 420 and then coordinate with the position of the battery cell. In this embodiment, the second bracket 410 and the fixed bending piece 420 are fixed by a threaded fastener 421. When the position of the fixed bending piece 420 needs to be changed, the threaded fastener 421 can be loosened to allow the second bracket 410 and the fixed bending piece 420 to slide with each other, and then the fixed bending piece 420 is moved along the length direction of the long hole 411 to change the position of the fixed bending piece 420 and make the bending plane of the fixed bending piece 420 relative to the winding center of the battery cell. Finally, the fixed bending piece 420 is fixed to the second bracket 410 again by the threaded fastener 421, and the position adjustment of the fixed bending piece 420 is completed.

[0044] In one embodiment, the movable bending member is provided with a plurality of pole ear grooves on the side adjacent to the fixed bending member, and the plurality of pole ear grooves are arranged side by side. The fixed bending member is provided with a plurality of protrusion structures, and the plurality of protrusion structures are used to be engaged with the plurality of pole ear grooves in a one-to-one correspondence, and the plurality of pole ear grooves are arranged adjacent to the plurality of positioning grooves in a one-to-one correspondence. When the pole ear of the battery cell is bent, the movable bending member contacts the pole ear and drives the pole ear to bend in a direction close to the fixed bending member, so that the pole ear forms a first angle at the connection between the side and the end face of the battery cell. However, the contact position of the movable bending member with the pole ear cannot be exactly the same each time. Therefore, when the pole ear is bent to form the first angle, it cannot be accurately bent in the direction of the winding center of the end face of the battery cell every time, resulting in the inability to form a second angle at the winding center of the battery cell when the bending member abuts against the fixed bending member, and then defective products are processed, which requires manual correction later, affecting production efficiency. In this embodiment, a plurality of pole lug grooves are provided on the side of the movable bending member adjacent to the fixed bending member, and the plurality of pole lug grooves are adjacently arranged corresponding to the plurality of positioning grooves one by one. When the movable bending member is pressed downward, the pole lug groove will move toward the pole lug of the battery cell, so that the pole lug enters the pole lug groove. When the movable bending member continues to be pressed downward, since the pole lug is located in the pole lug groove, the groove wall of the pole lug groove can limit the deflection of the pole lug, so that the pole lug can be accurately bent toward the end face winding center of the battery cell, thereby improving the quality of the pole lug bending, reducing the defective rate, and improving the processing efficiency of the folded pole lug.

[0045] In one embodiment, the fixed bending member includes a fixed portion and a raised portion, the fixed portion is connected to the second bracket, the raised portion is connected to the fixed portion, the raised portion protrudes from the side of the fixed portion adjacent to the movable bending member, and the raised portion is arranged adjacent to the positioning member, and a plurality of raised structures are arranged on the side of the raised portion adjacent to the movable bending member. When the cell tab is bent, the movable bending member contacts the tab and drives the tab to bend in a direction close to the fixed bending member, so that the tab forms a first angle at the connection between the side and end face of the cell. During the bending process of the first angle, the end of the tab away from the cell will first contact the fixed bending member, and at this time, the first angle and the end of the tab away from the cell begin to bend, that is, the second angle begins to bend, and when the fixed bending member abuts against the movable bending member, the bending of the second angle is completed. However, during the above-mentioned bending process of the pole ear, since the end of the pole ear away from the battery cell will contact the fixed bending part more quickly, and when the end of the pole ear away from the battery cell contacts the fixed bending part, the distance between the movable bending part and the fixed bending part is relatively large, the bending process of the second angle will be prolonged, and part of the pole ear structure between the folding point of the second angle of the pole ear and the end of the pole ear away from the battery cell will be bent as a whole, which makes it easy for the pole ear to be folded off-center when folding the second angle, thereby resulting in poor bending quality of the pole ear. In this embodiment, the raised portion is used to abut against the movable bending piece so that the pole ear is folded into a second angle. Since the raised portion protrudes from the side of the fixed portion adjacent to the movable bending piece, a gradient structure can be formed between the raised portion and the fixed portion. When the pole ear is folded, the end of the pole ear away from the battery cell will first contact the fixed portion. Since the raised portion protrudes from the side of the fixed portion, the movable bending piece can abut against the raised portion more quickly, thereby shortening the folding time of the second angle, reducing the probability of folding deviation when folding the second angle, thereby reducing the defective rate of the pole ear bending and improving the forming quality of the pole ear bending.

[0046] Furthermore, the side of the raised part adjacent to the active bending part and the side of the fixed part adjacent to the bending part are in a bevel transition shape. After the end of the pole ear away from the battery cell contacts the fixed part, and the active bending part continues to be pressed down, the inclined surface between the side of the raised part adjacent to the active bending part and the side of the fixed part adjacent to the bending part can play a supporting role, that is, the contact support of the part of the pole ear structure between the second folding point of the pole ear and the end of the pole ear away from the battery cell is provided, reducing the bending degree of the section of the pole ear structure, thereby reducing the probability of the pole ear being bent and improving the forming quality of the bending of the pole ear.

[0047] In one of the embodiments, the movable bending member is provided with a punching groove, and the punching grooves are respectively connected to the multiple pole lug grooves, and the length directions of the punching grooves are respectively perpendicular to the length directions of the multiple pole lug grooves; the pole lug folding device of the reverse-rolled battery cell also includes a pole lug cutting mechanism, the pole lug cutting mechanism includes a punching member and a third driving component, the fixed bending member is provided with a sliding groove, the punching member is located in the sliding groove, and the punching member is slidingly connected to the fixed bending member, the punching portion of the punching member is flush with the side of the fixed bending member adjacent to the movable bending member, and the punching portion of the punching member is arranged opposite to the punching groove, the third driving component is connected to the base, the power output end of the third driving component is connected to the punching member, and the third driving component is used to drive the punching member to approach or move away from the punching groove. In this embodiment, the punching piece is used to punch the bent pole ear so that the length of the pole ear is more moderate. Specifically, when the movable bending piece abuts against the fixed connecting piece, the pole ear completes the bending deformation, and the pole ear is located in the pole ear groove of the movable bending piece. At this time, the third driving component drives the punching piece to move in the direction close to the punching groove. During the movement, the punching piece contacts the pole ear and punches the pole ear, so that the excessively long part of the pole ear is removed, making the length of the pole ear more moderate. During the punching process, the punching piece will be inserted into the punching groove, which is connected to the pole ear groove and the depth of the punching groove is greater than the pole ear groove, thereby improving the success rate of the punching piece in punching the pole ear.

[0048] Furthermore, the fixed bending member is provided with a waste collection groove, and the waste collection groove is located on the side of the punching groove away from the positioning member. In this embodiment, after the punching member punches the tab, the tab located on the side of the punching member away from the positioning member is cut off by the punching member, and the cut tab waste falls into the waste collection groove of the fixed bending member, so as to avoid the tab waste falling anywhere after being punched, and facilitate the collection and cleaning of the tab waste.

[0049] The present application also provides a folding terminal ear device, including the folding terminal ear device 10 of the reverse-wound battery cell described in any of the above embodiments. Figure 1As shown, in one embodiment, the folding lug device 10 of the reverse-rolled battery cell includes a base 100, a battery cell positioning assembly 200, a battery cell pressing mechanism 300 and a lug bending mechanism 400. The battery cell positioning assembly 200 includes a positioning member 210, and the positioning member 210 is connected to the base 100. The battery cell pressing mechanism 300 includes a first bracket 310, a pressing member 320 and a first driving assembly 330, the first bracket 310 is connected to the base 100, the first driving assembly 330 is arranged on the first bracket 310, and the power output end of the first driving assembly 330 is connected to the pressing member 320, the pressing member 320 is arranged opposite to the positioning member 210, and the first driving assembly 330 is used to drive the pressing member 320 to approach or move away from the positioning member 210. The ear bending mechanism 400 includes a second bracket 410, a fixed bending piece 420, a movable bending piece 430 and a second driving component 440. The second bracket 410 is respectively connected to the base 100 and the fixed bending piece 420. The fixed bending piece 420 is arranged adjacent to the positioning piece 210. The second driving component 440 is arranged on the second bracket 410, and the power output end of the second driving component 440 is connected to the movable bending piece 430. The movable bending piece 430 is arranged opposite to the fixed bending piece 420. The second driving component 440 is used to drive the movable bending piece 430 to move closer to or away from the fixed bending piece 420.

[0050] In this embodiment, before folding the tab, the battery cell needs to be placed in the positioning member 210, and the fixed bending member 420 is located adjacent to the positioning member 210. After the battery cell is placed in the positioning member 210, the pole piece of the battery cell extends out of the positioning member 210 and extends between the fixed bending member 420 and the movable bending member 430. In order to make the bent tab be located at the winding center of the battery cell, the bending plane of the fixed bending member 420 is exactly located at the winding center of the battery cell. Therefore, when placing the battery cell in the positioning member 210, the battery cell needs to be rotated so that the pole piece of the battery cell is located outside the battery cell away from the positioning member 210, so that the battery cell can be placed in the positioning member 210 to bend the tab. After the battery cell is placed on the positioning piece 210, the folding ear device 10 of the reverse-rolled battery cell can be controlled to work. First, the pressing piece 320 is driven by the first driving component 330 to move toward the direction close to the positioning piece 210. When the pressing piece 320 contacts the battery cell, the pressing piece 320 stops moving. In this way, the battery cell is completely fixed under the positioning effect of the positioning piece 210 and the pressing effect of the pressing piece 320, which helps to make the battery cell more stable when the battery cell ear is bent, thereby ensuring the quality of the ear bending; then, the movable bending piece 430 is driven by the second driving component 440 to move toward the fixed bending piece 420. The movable bending member 430 will move in the same direction as the fixed bending member 420, and the movable bending member 430 will contact the pole ear of the battery cell during the displacement process. After the movable bending member 430 contacts the pole ear, it drives the pole ear to bend in the direction close to the fixed bending member 420, so that the pole ear forms a first fold angle at the connection between the side and the end face of the battery cell. The movable bending member 430 continues to move toward the fixed bending member 420, driving the pole ear to continue to bend. When the movable bending member 430 abuts against the fixed bending member 420, the bending plane of the fixed bending member 420 is located exactly at the winding center of the battery cell, and the pole ear will form a second fold angle at the winding center of the battery cell. In this way, the folding operation of the pole ear of the battery cell is completed.

[0051] Furthermore, the battery cell is fixed by the positioning member 210 and the pressing member 320, and the tab of the battery cell is bent by the fixed bending member 420 and the movable bending member 430, so that the tab forms a first folding angle at the connection between the side and the end face of the battery cell, and forms a second folding angle at the winding center of the battery cell, thereby completing the tab folding operation of the battery cell. Since the tab folding operation is automatically performed by the tab folding device, the speed of tab folding is effectively improved, thereby improving the production efficiency of the battery cell and the bending quality of the tab. The pressing member 320 can not only fix the battery cell, but also press the battery cell to reduce the thickness of the battery cell, thereby making the strength of the aluminum-plastic film wrapped around the battery cell higher, and making the battery cell as a whole lighter and thinner.

[0052] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A folding lug device for a reverse-wound battery cell, characterized in that: include: Base; A battery cell positioning assembly, the battery cell positioning assembly comprising a positioning member, the positioning member being connected to the base; A battery cell pressing mechanism, the battery cell pressing mechanism comprising a first bracket, a pressing piece and a first driving assembly, the first bracket being connected to the base, the first driving assembly being arranged on the first bracket, and a power output end of the first driving assembly being connected to the pressing piece, the pressing piece being arranged opposite to the positioning piece, and the first driving assembly being used to drive the pressing piece to approach or move away from the positioning piece; A tab bending mechanism, the tab bending mechanism comprising a second bracket, a fixed bending piece, a movable bending piece and a second driving assembly, the second bracket being connected to the base and the fixed bending piece respectively, the fixed bending piece being arranged adjacent to the positioning piece, the second driving assembly being arranged on the second bracket, and a power output end of the second driving assembly being connected to the movable bending piece, the movable bending piece being arranged opposite to the fixed bending piece, and the second driving assembly being used to drive the movable bending piece to approach or move away from the fixed bending piece; The positioning member is provided with a plurality of positioning grooves, and the plurality of positioning grooves are arranged side by side; the movable bending member is provided with a plurality of pole ear grooves on the side adjacent to the fixed bending member, and the plurality of pole ear grooves are arranged side by side; the fixed bending member is provided with a plurality of protrusion structures, and the plurality of protrusion structures are used to be embedded with the plurality of pole ear grooves in a one-to-one correspondence, and the plurality of pole ear grooves are arranged adjacent to the plurality of positioning grooves in a one-to-one correspondence; The battery cell positioning assembly also includes a positioning adjustment member, which is slidably connected to the base and slides toward or away from the positioning member, and each of the positioning grooves is located between the positioning adjustment member and the fixed bending member.

2. The folding ear device of the reverse-wound battery cell according to claim 1, characterized in that: The pressing part includes a connecting plate, a compression spring and a pressing plate. The connecting plate is connected to the power output end of the first driving component. The pressing plate is slidably connected to the connecting plate. The compression spring is located between the connecting plate and the pressing plate. The two ends of the compression spring are respectively abutted against the pressing plate and the connecting plate.

3. The folding ear device of the reverse-wound battery cell according to claim 2, characterized in that: The pressing plate also includes a pressing plate body, a connecting column and a clamping block, the pressing plate body is connected to the connecting column, the connecting plate is provided with a through hole, the connecting column is passed through the through hole and is slidably connected to the connecting plate, the clamping block is located on the side of the connecting plate away from the pressing plate body, and the clamping block is connected to the connecting column, the compression spring is sleeved on the connecting column, and the two ends of the compression spring are respectively abutted against the connecting plate and the pressing plate body, and the clamping block is used to abut against the side of the connecting plate away from the pressing plate when the compression spring is in a natural state.

4. The folding ear device of the reverse-wound battery cell according to claim 1, characterized in that: The pressing piece is slidably connected to the first bracket.

5. The folding ear device of the reverse-wound battery cell according to claim 4, characterized in that: The battery core pressing mechanism further includes a sliding connection component, which includes a slide rail and a slider, the slide rail is connected to the first bracket, the slider is connected to the pressing piece, and the slide rail is slidably connected to the slider.

6. The folding ear device of the reverse-wound battery cell according to claim 1, characterized in that: The fixed bending piece is detachably connected to the second bracket.

7. The folding ear device of the reverse-wound battery cell according to claim 6, characterized in that: The second bracket is provided with a long hole, and the fixed bent part is provided with a threaded hole, the threaded hole is connected with the long hole, the fixed bent part includes a threaded fastener, the threaded fastener passes through the long hole, and the threaded fastener is screwed into the threaded hole, and one end of the threaded fastener abuts against a side of the second bracket away from the fixed bent part.

8. A terminal ear folding device, characterized in that: A folded pole ear device for a reverse-wound battery cell comprising any one of claims 1 to 7.

Images