Cutting method and cutting device for semi-finished soft package battery

Abstract

The invention discloses a cutting method and a cutting device for a semi-finished soft package battery. The cutting method comprises the following steps: acquiring a target length LM of the semi-finished soft package battery and an actual length L of the semi-finished soft package battery to be cut; according to the actual length L and the target length LM, whether the to-be-cut soft package battery needs to be cut or not is judged; if yes, the cutter assembly is controlled to move from the cutting position where the semi-finished product soft package battery is cut to the target cutting position where the semi-finished product soft package battery is to be cut, and the battery shell of the semi-finished product soft package battery in the positioning clamp is cut. According to the embodiment of the invention, the semi-finished soft package battery with the actual length L and the target length LM exceeding the size specification is cut, so that the length value of each cut battery is closer to the target length LM, the effect of improving the length consistency of the batteries is achieved, the proportion of scrapped batteries is reduced, and the cost is reduced.

Description

Technical Field

[0001] The present invention relates to the field of soft-pack battery production, and in particular to a cutting method and a cutting device for semi-finished soft-pack batteries. Background Art

[0002] With the rapid development of consumer electronics, energy storage and electric vehicles, the demand for soft-pack lithium batteries is also increasing, and the performance requirements for soft-pack lithium batteries are also getting higher and higher. In soft-pack lithium batteries, the length consistency of the battery has an important impact on the performance and safety of the battery. Poor length consistency may cause uneven pressure distribution when the battery is assembled into a module, affecting the electrochemical state of the battery, and further affecting the cycle life and safety performance of the battery. In particular, soft-pack lithium batteries whose length exceeds the size specification requirements are generally scrapped due to assembly requirements of downstream processors, increasing production costs. Summary of the invention

[0003] The embodiments of the present invention provide a cutting method and a cutting device for semi-finished soft-pack batteries, so as to improve the consistency of length in soft-pack lithium batteries, thereby achieving the effect of improving the cycle life and safety performance of the batteries and reducing costs.

[0004] Specifically, the present invention provides a cutting method for a semi-finished soft-pack battery, the cutting method comprising the following steps: Get the target length L of the semi-finished soft pack battery M , the actual length L of the semi-finished soft-pack battery to be cut; the semi-finished soft-pack battery to be cut is a semi-finished soft-pack battery after the bare cell is shelled, the top and side are sealed, and the pressure resistance test is performed; According to the actual length L and the target length L M , determining whether the soft-pack battery to be cut needs to be cut; If yes, control the cutter assembly to move from the cutting position of the cut semi-finished soft-pack battery to the target cutting position of the semi-finished soft-pack battery to be cut, and cut the battery shell of the semi-finished soft-pack battery in the positioning fixture; If not, the cutter assembly does not act.

[0005] Optionally, the determining whether the actual battery needs to be cut includes: If the actual length L is less than the target length L M , then the semi-finished soft-pack battery to be cut does not need to be cut; If the actual length L is equal to the target length L M If the difference is between 0 and X, the semi-finished soft-pack battery to be cut needs to be cut; If the actual length L is equal to the target length L MIf the difference is greater than X, the semi-finished soft-pack battery to be cut is manually re-judged; Optional, 0.2mm≤X≤0.5mm.

[0006] The present invention also provides a cutting device, comprising: A positioning fixture, which is used to fix the semi-finished soft-pack battery; A cutting assembly, the cutting assembly having a cutter assembly for cutting a battery shell of a semi-finished soft-pack battery; A driving assembly, wherein the cutting assembly is arranged at an output end of the driving assembly, and the driving assembly is used to drive the cutting assembly to move in a direction close to or away from the positioning fixture; A controller, the controller being communicatively connected to the cutting assembly and the driving assembly respectively; A host computer, wherein a machine executable program is stored in the host computer, and when the machine executable program is executed by the controller, it is used to implement any of the above cutting methods; A CCD detector, the CCD detector is used to detect the length of the battery, and the CCD detector is communicatively connected with the host computer; A dust removal component is arranged below the cutting component and is used to receive debris.

[0007] Optionally, the cutting device further includes a base and a frame, the base is provided with a slide rail, and the frame is movably arranged on the slide rail; the driving assembly is fixedly arranged on the base, and the driving end of the driving assembly is connected to the frame; the cutting assembly is arranged on the frame.

[0008] Optionally, the cutting assembly includes a second servo motor and a second lead screw; the second servo motor is fixedly arranged on the frame, and the second servo motor is communicatively connected to the controller; the second lead screw is connected to the output end of the first servo motor; The cutter assembly comprises a movable cutter and a fixed cutter, wherein the movable cutter is screwed onto the second lead screw; The fixed knife is fixedly arranged on the frame, and the blade of the fixed knife and the blade of the movable cutting knife are arranged opposite to each other.

[0009] Optionally, a first clearance groove for avoiding the upper tab of the semi-finished soft-pack battery is provided on the blade of the movable cutter; The blade of the fixed knife is provided with a second clearance groove for avoiding the upper tab of the semi-finished soft-pack battery; The second yielding slots are arranged in one-to-one correspondence with the first yielding slots.

[0010] Optionally, the difference between the width of the first recess and the width of the tab is 0-2 mm, and the depth of the first recess is greater than 5 cm.

[0011] Optionally, the difference between the width of the second recess and the width of the tab is 0-2 mm, and the depth of the second recess is greater than 5 cm.

[0012] The beneficial effects of the present invention are: The present invention is based on the actual length L and the target length L of the semi-finished soft-pack battery to be cut. M Cut the semi-finished soft-pack batteries whose length exceeds the size specification so that the length of each soft-pack battery after cutting is closer to the target length L M , so as to improve the length consistency of the battery, thereby improving the cycle life and safety performance of the battery. Furthermore, since the semi-finished soft-pack batteries whose length exceeds the size specification requirements are cut again, the proportion of scrapped soft-pack batteries is reduced, and the cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0014] Figure 1 is a schematic structural diagram of a cutting device in one embodiment of the present invention; Figure 2 A schematic partial structural diagram of a cutting device in one embodiment of the present invention; Figure 3 1 is a schematic structural diagram of an uncut battery in one embodiment of the present invention.

[0015] In the figure: 100, cutting assembly, 120, second servo motor, 130, second lead screw, 150, movable cutter, 151, first make way slot, 160, fixed knife, 161, second make way slot, 200, driving assembly, 210, first servo motor, 220, first lead screw, 300, base, 310, slide rail, 400, rack, 500, dust removal assembly, 600, soft-pack battery to be cut, 601, punching area, 610, pole ear, 620, battery casing, 621, unsealed area, 622, top edge sealing, 623, side edge sealing, 630, pole ear glue. DETAILED DESCRIPTION

[0016] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0017] In the description of the present invention, it should be understood that the terms "longitudinal", "radial", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0018] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be glue injection inside two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] In the prior art, when preparing soft-pack batteries, the aluminum-plastic film is first punched and cut into multiple aluminum-plastic film sheets, which are folded in half to obtain a first shell, and then the bare battery cell is placed in the first shell. The two layers of laminated aluminum-plastic film and the ear glue between the two layers of aluminum-plastic film are heat-sealed on the top of the first shell through the heated head, and the two layers of laminated aluminum-plastic film are heat-sealed on the side of the first shell to form a semi-finished soft-pack battery, ensuring the sealing of the top and sides of the battery. The semi-finished soft-pack battery is processed through the processes of Hipot testing & inkjet printing, liquid injection, first sealing, formation, second sealing, and capacity division to form a finished soft-pack battery.

[0020] Due to process errors such as misalignment of the aluminum-plastic film during the cutting process, the first outer shells of different lengths will be produced; and in the top and side sealing process (i.e., top sealing and side sealing), the length of the battery shell of the semi-finished soft-pack battery may also change due to problems such as misalignment of the aluminum-plastic film. Among them, the semi-finished soft-pack batteries whose length exceeds the size specification requirements will still exceed the size specification after being prepared into finished soft-pack batteries. Considering the assembly requirements of downstream processors, they will generally be scrapped, increasing production costs.

[0021] Based on this, the present invention provides a cutting method for a soft-pack battery, the cutting method comprising the following steps: Get the target length L of the semi-finished soft pack battery M , the actual length L of the semi-finished soft-pack battery to be cut; the semi-finished soft-pack battery to be cut is a semi-finished soft-pack battery after the bare cell is shelled, the top and side are sealed, and the pressure test is performed; According to the actual length L and the target length L M , determining whether the soft-pack battery to be cut needs to be cut; If so, controlling the cutter assembly to move from the cutting position of the cut semi-finished soft-pack battery to the target cutting position of the semi-finished soft-pack battery to be cut, and cutting the battery casing (620) of the semi-finished soft-pack battery in the positioning fixture; If not, the cutter assembly does not act.

[0022] The length of the soft pack battery depends on the length of the battery case 620. That is, the target length L of the battery case M That is, the target length of the soft-pack battery. The consistency of the length of the soft-pack battery depends on the consistency of the length of the battery shell 620 after packaging. M Semi-finished soft-pack batteries that exceed the size specifications are cut so that the length of each soft-pack battery after cutting is closer to the target length, thereby improving the length consistency of the soft-pack batteries, thereby improving the cycle life and safety performance of the batteries, reducing the proportion of scrapped soft-pack batteries, and reducing costs.

[0023] In one embodiment of the present invention, the step of determining whether the battery casing needs to be cut includes: If the actual length L is less than the target length L M , then the semi-finished soft-pack battery to be cut does not need to be cut; If the actual length L is equal to the target length L M If the difference is between 0 and X, the semi-finished soft-pack battery to be cut needs to be cut; If the actual length L is equal to the target length L M If the difference is greater than X, the semi-finished soft-pack battery to be cut is manually re-judged; Among them, 0.2mm≤X≤0.5mm.

[0024] Due to the limitation of bare cells, the length of the battery housing 620 is less than the target length L M The difference is relatively small and does not affect subsequent use. The semi-finished soft-pack battery can enter the subsequent process without cutting. Therefore, it is only necessary to make the actual length L greater than the target length L. MThe semi-finished soft-pack batteries are placed in the positioning fixture for cutting. Through this screening step, the semi-finished soft-pack batteries whose length exceeds the size specification requirements are screened out and cut again, which reduces the proportion of scrapped soft-pack batteries and reduces costs.

[0025] Furthermore, since the battery shells 620 are cut by the same device, the difference between the battery shells 620 is small, so the actual length L of the semi-finished soft-pack battery is different from the target length L. M The difference is usually smaller than X. If the actual length L of the semi-finished soft-pack battery is different from the target length L M If the difference is greater than X, manual re-judgment is performed to avoid errors caused by interference from other factors.

[0026] The semi-finished soft-pack batteries that are not cut and the semi-finished soft-pack batteries that have been cut undergo vacuum baking, liquid injection, static standing, formation, aging, secondary sealing, molding, and OCV testing to finally obtain finished soft-pack batteries.

[0027] like Figure 3 As shown, the top sealing and side sealing processes form a top sealing edge 622 and a side sealing edge 623 on the battery housing 620 to achieve sealing of the bare battery cell. When the semi-finished soft-pack battery is top-sealed, in order to prevent the top sealing head from scalding the tab glue 630 at high temperature, the upper edge of the top sealing head and the edge of one end of the tab 610 of the semi-finished soft-pack battery need to be controlled to be 0.2~1.0mm; that is, an unsealed area 621 is formed on the battery housing 620, which is partially located on the side of the top sealing edge 622 away from the pit area 601. If the actual length L of the semi-finished soft-pack battery 600 to be cut is greater than the target length L M , cutting is performed in the unsealed area 621, which can control the length of the soft-pack battery and avoid losing the top sealing edge 622.

[0028] like Figure 1 As shown, the present invention also provides a cutting device, comprising: A positioning fixture, which is used to fix the semi-finished soft-pack battery; A cutting assembly 100, wherein the cutting assembly 100 has a cutter assembly for cutting a battery housing 620 of a semi-finished soft-pack battery; A driving assembly 200, wherein the cutting assembly 100 is disposed at an output end of the driving assembly 200, and the driving assembly 200 is used to drive the cutting assembly 100 to move in a direction close to or away from a first positioning fixture; A controller, the controller being communicatively connected to the cutting assembly 100 and the driving assembly 200 respectively; A host computer, wherein a machine executable program is stored in the host computer, and when the machine executable program is executed by the controller, it is used to implement the cutting method described in any of the above embodiments; A CCD detector is used to detect the length of the battery shell, and the CCD detector is communicatively connected with the host computer.

[0029] When applied, the host computer initializes and loads the setting parameters of the semi-finished soft-pack battery length (including the target length L of the semi-finished soft-pack battery M , position parameters of the cutter assembly and specification parameters of the CCD detector); then the host computer sends the battery shell length setting parameters to the controller, and the controller controls the cutting assembly 100 to cut the battery shell 620 of the semi-finished soft-pack battery according to the cutting method of the soft-pack battery shell, so that the length value of each soft-pack battery after cutting is closer to the target length L M , so as to improve the length consistency of the battery, thereby improving the cycle life and safety performance of the battery. Furthermore, since the semi-finished soft-pack batteries whose length exceeds the size specification requirements are cut again, the proportion of scrapped soft-pack batteries is reduced, and the cost is reduced.

[0030] Specifically, the CCD detector obtains the actual length L of the semi-finished soft-pack battery and transmits the actual length L to the host computer, which determines the difference between the actual length L and the target length L. M The relationship between the difference and X, if the actual length L and the target length L M If the difference between the actual length L and the target length L is less than 0, no cutting is performed and the semi-finished soft-pack battery can directly enter the next process; M If the difference between the actual length L and the target length L is greater than 0 and less than X, the controller controls the cutting assembly 100 to cut according to the cutting method of the soft-pack battery; M If the difference is greater than X, manual re-judgment is performed.

[0031] Specifically, the cutting device further comprises a base 300 and a frame 400, wherein the base 300 is provided with a slide rail 310, and the frame 400 is slidably arranged on the slide rail 310; the driving assembly 200 is fixedly arranged on the base 300, and the driving end of the driving assembly 200 is connected to the frame 400; the cutting assembly 100 is arranged on the frame 400. The driving assembly 200 comprises a first servo motor 210 and a first lead screw 220, wherein the first servo motor 210 is fixedly arranged on the base 300, and the first servo motor 210 is communicatively connected to the controller; the first lead screw 220 is connected to the output end of the first servo motor 210, and the frame 400 is screwed to the first lead screw 220.

[0032] The cutting assembly 100 includes a second servo motor 120, a second lead screw 130 and a cutter assembly, wherein the second servo motor 120 is fixedly arranged on the frame 400, and the second servo motor 120 is communicatively connected to the controller; one end of the second lead screw 130 is connected to the output end of the first servo motor 210; the cutter assembly includes a movable cutter 150 and a fixed knife 160, wherein the movable cutter 150 is screwed to the second lead screw 130; the fixed knife 160 is detachably connected to the frame 400, and the blade of the fixed knife 160 and the blade of the movable cutter 150 are arranged opposite to each other.

[0033] After the controller obtains the cutting instruction sent by the host computer, the controller controls the first servo motor 210 to rotate, so as to push the frame 400 to move along the slide rail 310 through the first lead screw 220, until the movable cutter 150 on the frame 400 reaches the target cutting position. Then the controller controls the second servo motor 120 to rotate, so as to drive the movable cutter 150 to move through the second lead screw 130, until the blade of the movable cutter 150 contacts the blade of the fixed knife 160, and the aluminum-plastic film is cut off. The purpose of selecting the servo motor as the power source is that the positioning accuracy of the servo motor can reach within 0.002mm, so the aluminum-plastic film can be accurately cut to improve the consistency of the length of the battery shell. The frame 400 and the drive assembly 200 are both rigidly connected to ensure the stability and accuracy of the cutting device.

[0034] When the battery shell is top-sealed, in order to avoid the top-sealing head from scalding the ear glue 630 at high temperature, the distance between the upper edge of the top-sealing head and the edge of one end of the battery shell with the ear 610 needs to be controlled at 0.2~1.0mm; that is, an unsealed area 621 is formed in the battery shell 620, which is partially located on the side of the top-sealing edge 622 away from the pit area 601. If the actual length L of the uncut shell 600 is greater than the target length L M , then cutting in the unsealed area 621 can control the length of the shell and avoid loss of the top seal; at the same time, in order to ensure the sealing of the tab glue 630 and the battery shell 620 at the tab 610, the width of the tab glue 630 needs to be greater than the width of the tab 610; preferably, the width of the tab glue 630 minus the width of the tab 610 is ≥ 2 mm. Figure 3As shown, in order to prevent the movable cutter 150 from damaging the tab 610, an embodiment of the present invention is provided with a first clearance groove 151 for avoiding the tab 610 on the housing on the blade of the movable cutter 150, the difference between the width of the first clearance groove 151 and the width of the tab 610 is 0-2mm, and the depth of the first clearance groove 151 is greater than 5cm. Similarly, a second clearance groove 161 for avoiding the tab 610 on the housing is provided on the blade of the fixed knife 160, the difference between the width of the second clearance groove 161 and the width of the tab 610 is 0-2mm, and the depth of the second clearance groove 161 is greater than 5cm. The second clearance groove 161 is provided in a one-to-one correspondence with the first clearance groove 151.

[0035] Furthermore, if Figure 2 As shown, the cutting device further comprises a dust removal assembly 500, which is arranged below the cutting assembly 100 and is used to collect debris. The dust removal assembly 500 can adopt a negative pressure adsorption method to promptly take away the cut aluminum-plastic film debris.

[0036] Example 1 The CCD detector obtains the actual length L of the soft-pack battery 600 to be cut, and transmits the actual length L to the host computer, which determines whether the actual length L is greater than the target length L. M The actual length L of the semi-finished soft-pack battery is less than the target length L M The semi-finished soft-pack battery is not processed; the actual length L is greater than the target length L M The semi-finished soft-pack battery is then judged by the host computer between the actual length L and the target length L M Is the difference less than X (X=0.2mm)? If so, move the soft-pack battery 600 to be cut into the positioning fixture. The upper computer determines the actual length L and the target length L. M The difference of controls the movable cutter 150 to move and cut the battery housing 620 of the soft-pack battery 600 to be cut in the positioning fixture to obtain a finished battery. Repeat the cutting to obtain 2000 finished batteries.

[0037] The difference between Examples 2 to 5 and Example 1 is only that X is changed. In Comparative Example 1, each battery shell is directly cut by a movable cutter 150 at a fixed cutting position.

[0038] Statistics of defective shells in various embodiments and comparative examples (the length of the shell after cutting still exceeds the target length L M ) and calculate the defective rate, defective rate = number of defective shells / 2000*100%. At the same time, measure the effective top seal width of each shell, and then calculate the average value of the effective top seal width of 2000 shells in each embodiment and comparative example. 宽 .

[0039] The condition variables and test data of Examples 1 to 5 and Comparative Example 1 are shown in Table 1: Table 1 Cutting data table of Examples 1 to 5 and Comparative Example 1 From the test results in Table 1, we can see that: By comparing the test results of Examples 1 to 5 and Comparative Example 1, it can be seen that the battery cutting method of the present invention is used to cut each battery length exceeding the target length L during the continuous production process. M The target cutting position of the battery is adjusted in real time, so that the length of each battery after cutting is L b Closer to target length L M Therefore, the defective rate of the batteries in each embodiment is much lower than that in comparative example 1; that is, according to the cutting method of the present invention, the length of the battery that exceeds the target length L M Cutting the batteries can reduce the number of scrapped batteries and reduce costs.

[0040] However, as the value of X increases, the average value of the effective top seal width of 2000 batteries in each embodiment is 宽 Gradually decreases; the reason may be that due to the large X value, when the actual length L of a battery in the production process is large, it is easy to affect the distance that the movable cutter 150 moves when the subsequent battery is cut, so that the aluminum-plastic film cut off the battery is longer, and part of the top sealing edge 622 is cut off, so the effective top sealing width of the battery is reduced. In order to ensure the sealing effect of the battery, the width of the top sealing edge 622 (effective top sealing width) should be greater than 1mm, so it is better that the X value is less than or equal to 0.5mm. The above-mentioned embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention is described in detail with reference to the above-mentioned embodiments, ordinary technicians in this field should understand that: it is still possible to modify the technical solutions recorded in the above-mentioned embodiments, or to replace some of the technical features therein by equivalent; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention.

Claims

1. A method for cutting a semi-finished soft-pack battery, characterized in that: The cutting method comprises the following steps: Get the target length L of the semi-finished soft pack battery M , the actual length L of the semi-finished soft-pack battery to be cut; the semi-finished soft-pack battery to be cut is a semi-finished soft-pack battery after the bare cell is shelled, the top and side are sealed, and the pressure resistance test is performed; According to the actual length L and the target length L M , determining whether the soft-pack battery to be cut needs to be cut; If so, controlling the cutter assembly to move from the cutting position of the cut semi-finished soft-pack battery to the target cutting position of the semi-finished soft-pack battery to be cut, and cutting the battery casing (620) of the semi-finished soft-pack battery in the positioning fixture; If not, the cutter assembly does not act.

2. The cutting method according to claim 1, characterized in that: The determining whether the actual battery needs to be cut includes: If the actual length L is less than the target length L M , then the semi-finished soft-pack battery to be cut does not need to be cut; If the actual length L is equal to the target length L M If the difference is between 0 and X, the semi-finished soft-pack battery to be cut needs to be cut; If the actual length L is equal to the target length L M If the difference is greater than X, the semi-finished soft-pack battery to be cut is manually re-judged.

3. The cutting method according to claim 2, characterized in that: 0.2mm≤X≤0.5mm.

4. A cutting device, characterized in that: include: A positioning fixture, which is used to fix the semi-finished soft-pack battery; A cutting assembly (100), the cutting assembly (100) comprising a cutter assembly for cutting a battery casing (620) of a semi-finished soft-pack battery; a driving component (200), wherein the cutting component (100) is arranged at an output end of the driving component (200), and the driving component (200) is used to drive the cutting component (100) to move in a direction approaching or moving away from the positioning fixture; a controller, the controller being communicatively connected to the cutting component (100) and the driving component (200) respectively; A host computer, wherein a machine executable program is stored in the host computer, and when the machine executable program is executed by the controller, it is used to implement the cutting method according to any one of claims 1 to 3; A CCD detector, the CCD detector is used to detect the length of the battery, and the CCD detector is communicatively connected with the host computer; A dust removal component (500), the dust removal component (500) is arranged below the cutting component (100) and is used to receive debris.

5. The cutting device according to claim 4, characterized in that: The cutting device further comprises a base (300) and a frame (400); a slide rail (310) is arranged on the base (300); and the frame (400) is movably arranged on the slide rail (310); the driving component (200) is fixedly arranged on the base (300), and a driving end of the driving component (200) is connected to the frame (400); and the cutting component (100) is arranged on the frame (400).

6. The cutting device according to claim 5, characterized in that: The driving assembly (200) comprises a first servo motor (210) and a first lead screw (220); the first servo motor (210) is fixedly arranged on the base (300); the first servo motor (210) is communicatively connected to the controller; one end of the first lead screw (220) is connected to the output end of the first servo motor (210), and the other end is screwed to the frame (400).

7. The cutting device according to claim 5, characterized in that: The cutting assembly (100) comprises a second servo motor (120) and a second lead screw (130); the second servo motor (120) is fixedly arranged on the frame (400), and the second servo motor (120) is communicatively connected to the controller; the second lead screw (130) is connected to the output end of the first servo motor (210); The cutter assembly comprises a movable cutter (150) and a fixed cutter (160); the movable cutter (150) is screwed onto the second lead screw (130); The fixed knife (160) is fixedly arranged on the frame (400), and the blade of the fixed knife (160) and the blade of the movable cutting knife (150) are arranged opposite to each other.

8. The cutting device according to claim 7, characterized in that: The blade of the movable cutter (150) is provided with a first clearance groove (151) for avoiding the upper tab (610) of the semi-finished soft-pack battery; The blade of the fixed knife is provided with a second clearance groove (161) for avoiding the upper tab of the semi-finished soft-pack battery; The second make way slot (161) is arranged in one-to-one correspondence with the first make way slot (151).

9. The cutting device according to claim 8, characterized in that: The difference between the width of the first clearance groove (151) and the width of the pole lug (610) is 0-2 mm, and the depth of the first clearance groove (151) is greater than 5 cm.

10. The cutting device according to claim 8, characterized in that: The difference between the width of the second clearance groove (161) and the width of the pole ear (610) is 0-2 mm, and the depth of the second clearance groove (161) is greater than 5 cm.

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