A power battery tab cutting device

Abstract

The present invention relates to a power battery tab cutting device, which includes a machine base, a driving mechanism, a connecting rod mechanism, a frame, a cutting mechanism, and a carrier plate. The driving mechanism is arranged on the machine base; the connecting rod mechanism includes a swing block respectively connected to two output ends of a double-output shaft AC motor, and a connecting rod connected to the swing block; the cutting mechanism is arranged on the frame, and the cutting mechanism includes two symmetrically arranged tool seats, a tool mounting plate slidably arranged on the tool seats, an upper tool connected to the tool mounting plate, and a lower tool arranged below the upper tool and forming a shearing fit with the upper tool. The initial installation positions of the two swing blocks are different; the carrier plate is arranged on the frame, and the carrier plate is located between the two tool seats, and the power battery to be cut is placed on the carrier plate. Compared with the prior art, the asynchronous cutting of the cutting mechanism in the present invention enables the two tabs not to come into contact simultaneously, effectively avoiding the short circuit of the battery cell.

Description

Technical Field

[0001] The invention relates to the field of power battery preparation, and in particular to a power battery tab cutting device. Background Art

[0002] At present, the cutting of the tabs is an indispensable process in the production of soft-pack power batteries. This process is to ensure that the tabs of multiple cells have the same size and a certain flatness after the cells are grouped, so the tabs of the cells will be left with a certain cutting length during production. The function of the tab cutting machine is to cut the reserved tabs to a specified length. Due to the innovation of soft-pack power batteries, the tabs are usually designed on both sides of the cell. The current practice is to use a cylinder to drive the "gate knife" for cutting.

[0003] CN112958821A discloses a battery cell tab cutting device, comprising: a battery cell transport mechanism, used for transporting the battery cell to a workbench; the workbench, comprising a work surface, a channel formed on the work surface, the battery cell transport mechanism transports the battery cell to the workbench through the channel for cutting operation; a first tab cutting mechanism, which can be movably mounted on the work surface on one side of the channel, to position and cut the tab on the left side of the battery cell; and a second tab cutting mechanism, which can be movably mounted on the work surface on the other side of the channel, to position and cut the tab on the right side of the battery cell.

[0004] CN211588682U discloses a battery tab cutting mechanism, comprising an upper cutter, a lower cutter, a first pushing mechanism, a second pushing mechanism and a positioning mechanism; a groove is provided on a side of the upper cutter facing the lower cutter, and an incision is formed between the groove and the blade of the lower cutter; the shifting mechanism is arranged on one side of the incision, and is used to shift the battery to a side close to the incision, and to feed the excess tabs of the battery into the incision; the first pushing mechanism and the second pushing mechanism respectively push the upper cutter and the lower cutter to perform a cutting action to cut the excess tabs of the battery.

[0005] The above document also discloses a pneumatic tab cutting machine. Since the battery cell is produced with electricity, the steel cutter will form a short circuit at the moment of cutting, so a lot of insulating pads or insulating blocks are required for insulation. Therefore, the technical solution in the document has the disadvantages of insufficient cutting force when the air source is not stable enough, relatively complex control and difficulty in insulation in the equipment. Summary of the invention

[0006] The purpose of the present invention is to provide a power battery tab cutting device in order to overcome the defects of the above-mentioned prior art. The cutting mechanism of the present invention performs asynchronous cutting, so that the two tabs cannot contact at the same time, effectively avoiding short circuit of the battery cell.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] The purpose of the present invention is to protect a power battery tab cutting device, including a machine base, a driving mechanism, a connecting rod mechanism, a frame, a cutting mechanism, and a carrier plate, wherein specifically:

[0009] A driving mechanism is arranged on the machine base, and the driving mechanism comprises a double-shaft AC motor;

[0010] The connecting rod mechanism comprises swing blocks respectively connected to two output ends of the double-output shaft AC motor and a connecting rod connected to the swing blocks;

[0011] A frame, arranged on the base;

[0012] A cutting mechanism is arranged on the frame, and the cutting mechanism includes two symmetrically arranged tool seats, a tool mounting plate slidably arranged on the tool seats, an upper tool connected to the tool mounting plate, and a lower tool arranged below the upper tool and forming a shearing cooperation with the upper tool. The tool mounting plate is hinged to the connecting rod, and the initial installation positions of the two swing blocks are different, so that the two swing blocks can drive the tool mounting plate to perform asynchronous vertical movement during the rotation and swinging process, and further realize the asynchronous shearing process of the upper tool and the lower tool;

[0013] A carrier plate is arranged on the frame, and the carrier plate is located between the two tool seats, and the power battery to be cut is placed on the carrier plate.

[0014] Furthermore, the driving mechanism also includes an integrated bearing seat and a transmission shaft passing through the integrated bearing seat, and the transmission shaft is drivingly connected to the output shaft of the double-output shaft AC motor through a coupling.

[0015] Furthermore, the swing block is provided with two connecting holes, and the transmission shaft is connected to the first connecting hole on the swing block.

[0016] Furthermore, one end of the connecting rod is connected to the second connecting hole on the swing block through a joint bearing a.

[0017] Furthermore, a connecting shaft is provided on the tool mounting plate;

[0018] The other end of the connecting rod is connected to the connecting shaft through a spherical bearing b.

[0019] Furthermore, a vertical mounting groove is provided on the tool seat, an oil-free bushing with a U-shaped cross-section is provided in the vertical mounting groove, and two sides of the tool mounting plate are slidably clamped in two oil-free bushings respectively.

[0020] Further, an upper tool holder is provided on the tool mounting plate, a fastener is provided on the upper tool holder, and the upper tool is fixedly connected to the tool holder through the fastener.

[0021] Further, a hollowed-out area is provided on the upper tool.

[0022] Further, a turnover box is also provided on the machine base, a blanking chute is provided on the turnover box, and the input end of the blanking chute is arranged below the lower tool.

[0023] Further, a strip-shaped hollowed-out hole is provided on the tool holder, and the connecting shaft penetrates through the mounting plate and passes out through the hollowed-out hole;

[0024] A plurality of proximity switches are provided on both sides of the hollowed-out hole, and the proximity switches obtain the vertical position of the connecting shaft in real time.

[0025] The principle of the present invention is as follows:

[0026] The battery cell of the present invention can enter the working area of the cutting mechanism by using a conveyor line or other logistics methods. The drive shaft is driven to rotate by a motor. Due to the presence of cam rockers at both ends of the drive shaft and the symmetrical installation of the rockers, the two sets of connecting rod mechanisms drive the two sets of cutting systems to perform cutting actions respectively. Due to the symmetrical installation of the rockers, the two sets of cutting systems can perform non-synchronous cutting.

[0027] In the present invention, the tool of the cutting mechanism is a hollowed-out tool. When the cutting knife on one side finishes cutting, a hollowed-out space will be vacated, and then the cutting knife on the other side will perform cutting. Due to the non-synchronous cutting of the cutting mechanism, the two pole tabs cannot possibly come into contact at the same time, effectively avoiding the short circuit of the battery cell. The pole tab fragments after cutting are sent to the designated waste box through the slideway.

[0028] Compared with the prior art, the present invention has the following technical advantages:

[0029] First, wide application range: Since the component mechanism of the equipment is modular, different types and lengths of battery cells with pole tabs coming out from the head and tail can be cut by changing different drive shafts.

[0030] Second, stable and reliable: The motor is used as the power source in the invention. First, it avoids the situation in the existing structure where the shearing force is insufficient due to the fluctuation of air pressure. Moreover, the service life and response speed of the motor are faster than those of the air cylinder.

[0031] Third, high safety: Since the invention uses an alternating cutting method, through the hollowed-out structure of the cutting knife, the positive and negative electrodes of the battery cell can never be connected during the cutting action, eliminating the short circuit situation in the prior art due to the wear or improper installation of the insulating block.

[0032] IV. Easy maintenance: Since the drive mechanism in the invention uses a shrink disc for connection, it is convenient to disassemble and assemble. At the same time, the external cutting knife is convenient to disassemble and assemble during wear repair and spot inspection and maintenance. Description of the Drawings

[0033] Figure 1 It is a schematic diagram of the overall structure of the power battery tab cutting device in the present invention;

[0034] Figure 1 As indicated by the reference numerals in the figure:

[0035] 100, power drive mechanism; 200, connecting rod mechanism; 300, cutting mechanism; 400, machine base.

[0036] Figure 2 It is a schematic diagram of the power drive mechanism in the present invention;

[0037] Figure 2 As indicated by the reference numerals in the figure:

[0038] 101, double-output shaft AC motor; 102, coupling; 103, integrated bearing housing; 104, transmission shaft.

[0039] Figure 3 It is a schematic diagram of the connecting rod structure and the cutting mechanism in the present invention;

[0040] Figure 3 As indicated by the reference numerals in the figure:

[0041] 121, swing block; 122, shrink disc; 123, spherical plain bearing a; 124, connecting rod; 125, spherical plain bearing b; 126, connecting shaft.

[0042] Figure 4 It is a schematic diagram of the cutting mechanism in the present invention.

[0043] Figure 4 As indicated by the reference numerals in the figure:

[0044] 131-1, tool holder a; 132, tool mounting plate; 133, oil-free bushing; 134, upper tool; 135, upper tool tightening seat; 136, lower tool; 137, blanking chute; 138, proximity switch; 131-2, tool holder b; 139, frame; 1310, turnover box.

[0045] Figure 5 It is a schematic diagram of the state of the right cutting knife when the left cutting knife of the present invention is lifted.

[0046] Figure 5 As indicated by the reference numerals in the figure:

[0047] 134L, left cutting knife; 134R, right cutting knife; CL, left electrode tab of the battery cell; CR, right electrode tab of the battery cell.

[0048] Figure 6 This is a schematic diagram of the state of the right cutting knife when the left cutting knife in the present invention falls and contacts the battery cell.

[0049] Figure 7 This is a schematic diagram of the state of the right cutting knife when the operation of the left cutting knife in the present invention is completed.

[0050] Figure 8 This is a schematic diagram of the state of the right cutting knife when the operation of the left cutting knife in the present invention is completed and the return stroke operation is performed. Detailed implementation manners

[0051] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. In this technical solution, features such as component models, material names, connection structures, control methods, algorithms, etc. that are not clearly described are regarded as common technical features disclosed in the prior art.

[0052] The power battery tab cutting device in this embodiment includes a machine base 400, a driving mechanism 100, a connecting rod mechanism 200, a frame 139, a cutting mechanism, and a carrier plate. Specifically, refer to Figures 1 to 4 .

[0053] The driving mechanism 100 is arranged on the machine base 400. The driving mechanism 100 includes a double-output shaft AC motor 101. The driving mechanism 100 further includes an integrated bearing seat 103 and a transmission shaft 104 passing through the integrated bearing seat 103. The transmission shaft 104 is in transmission connection with the output shaft of the double-output shaft AC motor 101 through a coupling 102. There are two connection holes on the swing block 121, and the transmission shaft 104 is connected to the first connection hole on the swing block 121.

[0054] The connecting rod mechanism 200 includes a swing block 121 respectively connected to two output ends of the double-output shaft AC motor 101 and a connecting rod 124 connected to the swing block 121. One end of the connecting rod 124 is connected to the second connection hole on the swing block 121 through a spherical plain bearing a 123. A connecting shaft 126 is provided on the tool mounting plate 132; the other end of the connecting rod 124 is connected to the connecting shaft 126 through a spherical plain bearing b 125. A vertical mounting groove is provided on the tool holder, and an oil-free bushing 133 with a U-shaped cross section is provided in the vertical mounting groove. The two sides of the tool mounting plate 132 are respectively slidably clamped in the two oil-free bushings 133.

[0055] The frame 139 is arranged on the machine base 400.

[0056] The cutting mechanism is arranged on the frame 139. The cutting mechanism includes two symmetrically arranged tool seats, a tool mounting plate 132 slidably arranged on the tool seats, an upper tool 134 connected to the tool mounting plate 132, and a lower tool 136 arranged below the upper tool 134 and forming a shearing fit with the upper tool 134. The tool mounting plate 132 is hinged to the connecting rod 124. The initial installation positions of the two swing blocks 121 are different, so that the two swing blocks 121 can drive the tool mounting plate 132 to perform asynchronous vertical movement during the rotational swing process, further realizing the asynchronous shearing process of the upper tool 134 and the lower tool 136.

[0057] An upper tool tightening seat 135 is arranged on the tool mounting plate 132. A fastener is arranged on the upper tool tightening seat 135. The upper tool 134 is fixedly connected to the tool tightening seat 135 through the fastener. The upper tool 134 is provided with a hollowed-out area. A turnover box 1310 is also arranged on the machine base 400. A blanking groove 137 is arranged on the turnover box 1310. The input end of the blanking groove 137 is arranged below the lower tool 136. The tool seat is provided with a strip-shaped hollowed-out hole. The connecting shaft 126 penetrates through the mounting plate 132 and passes out from the hollowed-out hole. Optionally, a plurality of proximity switches 18 are arranged on both sides of the hollowed-out hole. The proximity switches 18 acquire the vertical position of the connecting shaft 126 in real time. Thereby, the position of the upper tool 134 is determined respectively in real time, and the position information is fed back to the motor 101 through a single-chip microcomputer or a microprocessor, realizing relatively precise control.

[0058] The carrier plate is arranged on the frame 139, and the carrier plate is located between the two tool seats, namely the tool seat 131a and the tool seat 131b. The power battery to be cut is placed on the carrier plate.

[0059] In the present invention, the transmission mechanism is mainly composed of a double-output shaft AC motor 101, a coupling 102, an integrated bearing seat 103 and a transmission shaft 104. The transmission mechanism uses a set of motor 101, and uses two sets of couplings 102, two sets of integrated bearing seats 103 and two sets of transmission shafts 104 to transmit power to both sides. The transmission shaft 104 can be processed with different lengths according to the width of the conveyor line to adapt to the lengths of different products.

[0060] In the present invention, after the swing block 121 is assembled with the transmission shaft 104 through a shrink disc 122, different angles are formed. The connecting rod 124 is connected to the swing block 121 through a spherical plain bearing a 123 and a spherical plain bearing b 126, forming a connecting rod type motion mechanism. The connecting shaft 126 is fixed on the tool seats 131-1 and 131-2. The tool seats 131 and 131-2, the tool mounting plate 132 and the oil-free bushing 133 jointly form an up-and-down motion mechanism. Through the different installation angles of the swing block 121, the upper tool 134 presents different heights during operation.

[0061] In the present invention, the cutting action is jointly composed of the upper tool 134, the upper tool clamping seat 135, and the lower tool 136. Among them, the upper tool 134 is a hollow tool used to avoid the tool from contacting the tab.

[0062] The blanking chute 137 is a pipe structure, and the turnover box 1310 is a cavity for blanking and holding. The blanking chute 137 and the turnover box 1310 form a blanking collection assembly to hold the debris generated by cutting.

[0063] The frame 139 is a welded structure used to install and fix the above various structures.

[0064] In this embodiment, the operation process of this solution is further elaborated with the following several typical states.

[0065] State 1

[0066] Figure 5 This is a schematic diagram of the state of the right cutting tool when the left cutting tool of the present invention is lifted. As shown in the figure: when the left cutting tool 134L is lifted, the right cutting tool 134R enters the cutting action. The right tab CR of the battery cell enters the cavity area of the right cutting tool 134R. There is no contact condition between the left tab CL of the battery cell and the right tab CR of the battery cell, and no short circuit will occur.

[0067] State 2

[0068] Figure 6 This is a schematic diagram of the state of the right cutting tool when the left cutting tool of the present invention falls and contacts the battery cell. As shown in the figure: when the left cutting tool 134L falls and contacts the battery cell, the cutting action of the right cutting tool 134R is completed. The right tab CR of the battery cell is still in the cavity area of the right cutting tool 134R. There is no contact condition between the left tab CL of the battery cell and the right tab CR of the battery cell, and no short circuit will occur.

[0069] State 3

[0070] Figure 7 This is a schematic diagram of the state of the right cutting tool when the action of the left cutting tool of the present invention is completed. As shown in the figure: when the cutting action of the left cutting tool 134L is completed and the cutting action of the right cutting tool 134R is completed, the left side of the battery cell enters the cavity area of the left cutting tool 134L. The right cutting tool 134R performs a lifting action. At the same time, the right tab CR of the battery cell is still in the cavity area of the right cutting tool 134R. There is no contact condition between the left tab CL of the battery cell and the right tab CR of the battery cell, and no short circuit will occur.

[0071] State 4

[0072] Figure 8When the left cutting knife of the present invention completes its cutting action and returns, the following is a schematic diagram of the state of the right cutting knife: As shown in the figure, the cutting action of the left cutting knife 134L is completed and it moves upward. The right cutting knife 134R has completed its upward movement. The left side LR of the battery cell is still in the cavity area of the left cutting knife 134L. The right cutting knife 134R has lifted away from the right ear LR of the battery cell. The left ear CL and the right ear CR of the battery cell never come into contact and no short circuit will occur.

[0073] The above description of the embodiments is to enable those of ordinary skill in the art to understand and use the invention. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative efforts. Therefore, the present invention is not limited to the above embodiments, and all improvements and modifications made by those skilled in the art without departing from the scope of the present invention as disclosed should be within the protection scope of the present invention.

Claims

1. A power battery tab cutting device, It is characterized in that include: Base (400); A driving mechanism (100) is disposed on the machine base (400), wherein the driving mechanism (100) comprises a double-shaft AC motor (101); The connecting rod mechanism (200) comprises a swing block (121) respectively connected to two output ends of the double-output shaft AC motor (101), and a connecting rod (124) connected to the swing block (121); A machine frame (139) disposed on the machine base (400); A cutting mechanism is arranged on the frame (139), the cutting mechanism comprising two symmetrically arranged tool seats, a tool mounting plate (132) slidably arranged on the tool seats, an upper tool (134) connected to the tool mounting plate (132), and a lower tool (136) arranged below the upper tool (134) and forming a shearing cooperation with the upper tool (134), the tool mounting plate (132) being hinged to the connecting rod (124), and the initial installation positions of the two swing blocks (121) being different, so that the two swing blocks (121) can drive the tool mounting plate (132) to perform asynchronous vertical movement during the process of rotation and swinging, thereby further realizing an asynchronous shearing process of the upper tool (134) and the lower tool (136); A carrier plate, arranged on the frame (139), and the carrier plate is located between the two tool seats; The tool seat is provided with a vertical mounting groove, in which an oil-free bushing (133) with a U-shaped cross section is provided, and the two sides of the tool mounting plate (132) are respectively slidably clamped in the two oil-free bushings (133); An upper tool tightening seat (135) is provided on the tool mounting plate (132), a fastener is provided on the upper tool tightening seat (135), and the upper tool (134) is fixedly connected to the tool tightening seat (135) via the fastener.

2. A power battery tab cutting device according to claim 1, It is characterized in that The driving mechanism (100) further comprises an integrated bearing seat (103) and a transmission shaft (4) passing through the integrated bearing seat (103); the transmission shaft (4) is drivingly connected to an output shaft of the double-output shaft AC motor (101) via a coupling (2).

3. A power battery tab cutting device according to claim 2, It is characterized in that The swing block (121) is provided with two connection holes, and the transmission shaft (4) is connected to the first connection hole on the swing block (121).

4. A power battery tab cutting device according to claim 3, It is characterized in that One end of the connecting rod (124) is connected to the second connecting hole on the swing block (121) via a joint bearing a (123).

5. A power battery tab cutting device according to claim 4, It is characterized in that The tool mounting plate (132) is provided with a connecting shaft (126); The other end of the connecting rod (124) is connected to the connecting shaft (126) via a joint bearing b (125).

6. A power battery tab cutting device according to claim 1, It is characterized in that The upper tool (134) is provided with a hollowed-out area.

7. A power battery tab cutting device according to claim 1, characterized in that, a turnover box (1310) is further provided on the machine base (400), a blanking groove (137) is provided on the turnover box (1310), and the input end of the blanking groove (137) is arranged below the lower tool (136).

8. A power battery tab cutting device according to claim 5, characterized in that, a strip-shaped hollowed-out hole is provided on the tool holder, and the connecting shaft (126) penetrates through the mounting plate (132) and passes out through the hollowed-out hole; a plurality of proximity switches (18) are arranged on both sides of the hollowed-out hole, and the proximity switches (18) acquire the vertical position of the connecting shaft (126) in real time.

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