Pole piece cutting device and pole piece thermal compounding equipment

Abstract

The utility model provides a pole piece cutting device and pole piece thermal compounding equipment, the pole piece cutting device comprises at least two cutting knives, the two cutting knives are configured to be capable of moving towards each other or away from each other, so that the two cutting knives are configured to have a closed state and an open state; the pole piece assembly is positioned between the two cutting knives; and the thermal resistance wire is connected to at least one of the two cutting knives and is used for providing heat to cut the blank section of the pole piece assembly.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a pole piece cutting device and pole piece thermal composite equipment. Background Art

[0002] Thermal composite lamination is to thermally composite the positive electrode sheet, the negative electrode sheet, and the diaphragm to form a continuous thermal composite unit, and then stack the thermal composite units to form a battery core pack. Two adjacent thermal composite units are connected by a blank section. The blank section is configured to be composed of a diaphragm without positive and negative electrode sheets. In the process of continuous stacking of thermal composite units, the blank section between two adjacent battery core packs needs to be cut off. Due to the thin thickness of the diaphragm, the use of hardware molds for cutting in the related technology will result in the diaphragm not being cut, thereby affecting the continuous progress of the thermal composite process of the electrode sheet. Utility Model Content

[0003] The embodiments of the utility model provide a pole piece cutting device and a pole piece thermal compounding device, which can improve the technical problem of continuous cutting of the blank section.

[0004] In a first aspect, an embodiment of the utility model provides a pole piece cutting device for cutting a pole piece assembly, wherein the pole piece assembly includes a plurality of continuous pole piece units and a blank section for connecting adjacent pole piece units, and the pole piece cutting device includes:

[0005] At least two cutting knives, the two cutting knives are configured to move toward or away from each other, so that the two cutting knives are configured to have a closed state and an open state, and the pole piece assembly is located between the two cutting knives;

[0006] The thermal resistance wire is connected to at least one of the two cutting knives and is used to provide heat to cut the blank section of the pole piece assembly.

[0007] In one embodiment, the blank section of the pole piece assembly includes two layers of diaphragms, and the operating temperature of the thermal resistance wire is greater than 180°C.

[0008] In one embodiment, the two cutting knives include a first cutting knife and a second cutting knife, the first cutting knife is provided with a cutout at one end facing the second cutting knife, the thermal resistance wire includes a cutting portion and an electrical connection portion connected to each other, the cutting portion is arranged on the outside of the cutout and parallel to the cutout, and the electrical connection portion is arranged inside the first cutting knife.

[0009] In one embodiment, the cutting portion extends in a straight line, and the length of the cutting portion is greater than the width of the pole piece assembly; and / or the length of the cutting portion is set to 50 mm to 400 mm.

[0010] In one embodiment, a groove is provided at one end of the second cutting blade facing the first cutting blade, and the groove is configured to accommodate a portion of the cutting portion.

[0011] In one embodiment, the depth of the groove is set to 1 mm to 5 mm.

[0012] The pole piece cutting device comprises two cutters, the first cutting blade is located on one of the two cutters, and the second cutting blade is located on the other of the two cutters; or,

[0013] The electrode sheet cutting device comprises a cutter, the cutter is provided with a hollow inner cavity, and the first cutting knife and the second cutting knife are arranged in the inner cavity of the cutter.

[0014] In one embodiment, the cutter includes a first drive device and a second drive device, the first drive device is used to drive the first cutting knife, and the second drive device is used to drive the second cutting knife, the first drive device and the second drive device are used to synchronously drive the first cutting knife and the second cutting knife to move toward each other or away from each other, thereby controlling the first cutting knife and the second cutting knife to be in a closed state or an open state.

[0015] In one embodiment, the two cutters include a first cutter and a second cutter, the first cutter further includes a first support seat, and the first driving device and the first cutting blade are fixed on the first support seat;

[0016] The second cutter includes a second support seat, the second driving device and the second cutting knife are fixed on the second support seat, the first support seat and the second support seat are spaced apart, and the first cutting knife and the second cutting knife are arranged in the space between the first support seat and the second support seat.

[0017] In one embodiment, the first cutting blade and the second cutting blade are both configured in a triangular prism shape, the width of the first cutting blade decreases in a direction from the first cutting blade to the second cutting blade, and the width of the second cutting blade decreases in a direction from the second cutting blade to the first cutting blade.

[0018] In a second aspect, an embodiment of the utility model provides a pole piece thermal composite device, the pole piece thermal composite device comprises the pole piece cutting device and the laminating device, the laminating device and the pole piece cutting device are arranged at a distance.

[0019] Beneficial effects of the embodiments of the utility model:

[0020] In an embodiment of the utility model, a thermal resistance wire is arranged on at least one of the first cutting knife and the second cutting knife, and high-temperature heat is generated when the thermal resistance wire is energized. The high-temperature heat is configured to be able to cut the blank section of the pole piece assembly in a melting manner, thereby improving the technical problem of continuous cutting of the blank section. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 It is a three-dimensional structural diagram of a pole piece cutting device provided by an embodiment of the utility model in an open state;

[0023] Figure 2 It is a three-dimensional structural diagram of a pole piece cutting device provided by an embodiment of the utility model in a closed state;

[0024] Figure 3 is a three-dimensional diagram of a cutting device provided in an embodiment of the utility model;

[0025] Figure 4 is a three-dimensional structural diagram of a first cutter provided in an embodiment of the utility model;

[0026] Figure 5 is an exploded view of a first cutter provided in an embodiment of the utility model;

[0027] Figure 6 is a three-dimensional structural diagram of a second cutter provided in an embodiment of the utility model;

[0028] Figure 7 is a stereogram of a pole piece assembly provided in an embodiment of the utility model;

[0029] Figure 8 It is a three-dimensional diagram of a pole piece thermal composite device provided by an embodiment of the utility model;

[0030] Figure Number:

[0031] 100, pole piece thermal composite equipment; 1, pole piece cutting device; 10, first cutter; 11, first cutting knife; 12, incision; 13, first driving device; 14, first support seat; 20, second cutter; 21, second cutting knife; 22, groove; 23, second driving device; 24, second support seat; 30, thermal resistance wire; 31, cutting part; 32, electrical connection part; 321, positive electrode electrical connection part; 322, negative electrode electrical connection part; 2, lamination device; 200, pole piece assembly; 210, pole piece thermal composite unit; 220, blank section; DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model. In the utility model, unless otherwise stated, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0033] The embodiment of the utility model provides a pole piece thermal composite device, such as Figure 1 As shown, the pole piece thermal composite equipment 100 includes a thermal composite device (not shown), a pole piece cutting device 1 and a lamination device 2 .

[0034] like Figure 2 As shown, the pole piece assembly 200 includes a plurality of pole piece thermal composite units 210, and two adjacent thermal composite units 210 are connected by a blank section 220. The pole piece thermal composite unit 210 includes a positive pole piece, a first separator, a negative pole piece and a second separator, and the blank section 220 is configured to be composed of only a separator.

[0035] The thermal composite unit 210 is formed by thermally composite the positive electrode sheet, the negative electrode sheet, and the separator by a thermal composite device. After the blank section 220 in the electrode assembly 200 is cut by the electrode cutting device 1, the electrode assembly 200 forms a plurality of groups of electrode thermal composite units 210, and each group of electrode thermal composite units 210 is stacked to form a single battery core pack.

[0036] Since the blank section 220 is configured to be composed of a diaphragm without a positive electrode sheet and a negative electrode sheet, the thickness of the diaphragm is relatively thin. When a hardware mold is used for cutting in the related art, the diaphragm cannot be cut continuously, thereby affecting the continuous progress of the thermal composite process.

[0037] The embodiment of the utility model provides a novel electrode cutting device 1 and an electrode thermal composite device 100, which can improve the technical problem of continuous cutting of the blank section 220.

[0038] refer to Figures 3 to 8 As shown, the pole piece cutting device 1 includes at least two cutting knives arranged opposite to each other and a thermal resistance wire connected to at least one of the two cutting knives. The two cutting knives are configured to move toward or away from each other, so that the two cutting knives are configured to have a closed state and an open state, and the pole piece assembly is located between the two cutting knives. When the two cutting knives are in the closed state, the two cutting knives are configured to clamp the pole piece assembly 200 and cut the blank section 220 in the pole piece assembly 200. When the two cutting knives are in the open state, the interval between the two cutting knives is configured to allow the pole piece assembly 200 to pass through.

[0039] like Figure 3 As shown, during the stacking process of the pole piece assembly 200, the two cutting blades are in an open state, and the pole piece assembly 200 can pass through the gap between the first cutter 10 and the second cutter 20. Figure 4 As shown, when the blank section 220 in the pole piece assembly 200 needs to be cut, the two cutting knives are in a closed state, and the blank section 220 of the pole piece assembly 200 is clamped between the first cutter 10 and the second cutter 20. The high temperature heat generated by the thermal resistance wire 30 cuts the blank section 220 by high temperature hot melting.

[0040] By providing a thermal resistance wire 30 in at least one of the two cutting knives, the thermal resistance wire 30 can generate high temperature heat after being energized, and the high temperature heat can cut the blank section 220 by fusing. The cutting is performed by high temperature hot melting, so that as long as the blank section 220 contacts the thermal resistance wire 30, the blank section 220 can be quickly cut off, thereby effectively preventing the blank section 220 from being cut continuously.

[0041] In some embodiments, the blank section 220 of the pole piece assembly 200 includes two layers of diaphragms, and the operating temperature of the thermal resistance wire 30 is greater than 180°C.

[0042] The above-mentioned thermal composite electrode unit includes a positive electrode, a first diaphragm, a negative electrode and a second diaphragm stacked in sequence. The blank section 220 is configured to be composed of a first diaphragm and a second diaphragm. The thickness of the single-layer diaphragm is approximately 12μm. The temperature of the heat that can be generated by the thermal resistance wire 30 after power is turned on is greater than 180°C. The temperature of the thermal resistance wire 30 is greater than the melting temperature of the diaphragm. Therefore, when the diaphragm contacts the surface of the resistance wire, the thermal resistance wire 30 can quickly melt the diaphragm.

[0043] Further references Figures 3 to 7 As shown, the two cutting knives include a first cutting knife 11 and a second cutting knife 21, and a cut 12 is provided at one end of the first cutting knife 11 facing the second cutting knife 21. The thermal resistance wire 30 includes a cutting portion 31 and an electrical connection portion 32 connected to each other, and the cutting portion 31 is arranged on the outside of the cut 12 and parallel to the cut 12, and the electrical connection portion 32 is arranged inside the first cutting knife 11.

[0044] The cutting portion 31 of the thermal resistance wire 30 is usually made of alloy materials such as nickel and chromium to form a slender metal wire. Since the strength of the thermal resistance wire 30 itself is relatively weak, during the cutting process, the thermal resistance wire 30 needs to be fixed with the aid of the above-mentioned first cutting knife 11. By setting the cutting portion 31 of the thermal resistance wire 30 at the incision 12 of the first cutting knife 11, during the process of the thermal resistance wire 30 cutting the blank section 220, the cutting portion 31 of the thermal resistance wire 30 abuts against the incision 12 of the first cutting head, so that the thermal resistance wire 30 can be stably maintained on one side of the pole piece assembly 200 and maintain contact with the blank section 220 of the pole piece assembly 200.

[0045] The electrical connection portion 32 of the thermal resistance wire 30 is usually configured as a connecting wire, and the electrical connection portion 32 of the thermal resistance wire 30 is placed inside the first cutting knife 11 to maintain the stability of the structure of the thermal resistance wire 30 itself.

[0046] The first cutting knife 11 has a first end and a second end that are oppositely disposed. The cutout 12 is disposed at the second end of the first cutting knife 11 . The thickness of the first cutting knife 11 gradually decreases from the first end to the second end. The cutout 12 is disposed at the second end of the first cutting knife 11 .

[0047] like Figure 7 As shown, the electrical connection portion 32 includes a positive electrical connection portion 321 and a negative electrical connection portion 322 . The positive electrical connection portion 321 is disposed at one end of the cutting portion 31 , and the negative electrical connection portion 322 is disposed at the other end of the cutting portion 31 .

[0048] The first cutting knife 11 is configured as a polyhedron structure, the cutting portion 31 is configured at the incision 12 of the first cutting knife 11, and the cutting portion 31 is configured on the outside of the first cutting knife 11, the thermal resistance wire 30 is fixed to the first cutting knife 11 through the electrical connection portion 32, and the cutting portion 31 is configured as a whole to cut the blank section 220 of the electrode assembly 200, by setting the positive electrical connection portion 321 at one end of the cutting portion 31 and the negative electrical connection portion 322 at the other end of the cutting portion 31, the positive electrical connection portion 321 and the negative electrical connection portion 322 are respectively extended to the inside of the first cutting knife 11 for fixation, and the positive electrical connection portion 321 and the negative electrical connection portion 322 are respectively arranged at both ends of the cutting portion 31, which is conducive to maintaining the overall stability of the cutting portion 31, thereby facilitating stable contact between the cutting portion 31 and the blank section 220 of the electrode assembly 200.

[0049] Further references Figure 2 and Figure 7 As shown, the cutting portion 31 extends in a straight line, and the length L of the cutting portion 31 is greater than the width W of the pole piece assembly 200; and / or, the length L of the cutting portion 31 is set to 50 mm to 400 mm.

[0050] The pole piece assembly 200 is configured as a sheet body as a whole. When the first cutting knife 11 and the second cutting knife 21 are in a closed state, the cutting portion 31 is arranged between the first cutting knife 11 and the second cutting knife 21, and the pole piece assembly 200 is between the cutting portion 31 and the second cutting knife 21. The contact between the cutting portion 31 and the pole piece assembly 200 is configured as the entire outer side surface of the cutting portion 31. The cutting portion 31 is configured as a straight extension as a whole, and the length of the cutting portion 31 is set to be greater than the width of the pole piece assembly 200, which is conducive to forming a stable contact between the cutting portion 31 and the blank section 220, so that the cutting portion 31 can quickly cut the blank section 220.

[0051] According to the different width ranges of the pole piece assembly 200, in a preferred implementation, the length of the cutting portion 31 is set to 50 mm to 400 mm. In a specific implementation, according to the different widths of the pole piece assembly 200 to be cut, the cutting portion 31 can be set to 50 mm, 100 mm, 150 mm, 200 mm, 250 mm, 300 mm, 350 mm, 400 mm, or a value between any two of the above values ​​or a range between any two of the above values.

[0052] Further references Figures 3 to 8 As shown, a groove 22 is provided at one end of the second cutting blade 21 facing the first cutting blade 11 , and the groove 22 is configured to accommodate a portion of the cutting portion 31 .

[0053] Since the cutting portion 31 of the thermal resistance wire 30 disposed at the end of the first cutting knife 11 is disposed as a whole protruding relative to the end surface of the first cutting knife 11, a groove 22 is disposed at the end of the second cutting knife 21, and the groove 22 is used to accommodate a portion of the cutting portion 31, thereby preventing the thermal resistance wire 30 from interfering with the end of the second cutting knife 21 and being damaged. It is understandable that if the end of the second cutting knife 21 that cooperates with the first cutting knife 11 is also configured as a notch, when the first cutting knife 11 and the second cutting knife 21 are closed, the notch on the second cutting knife 21 will form a hard squeeze on the thermal resistance wire 30 disposed at the notch 12 of the first cutting knife 11, thereby causing the thermal resistance wire 30 to be broken.

[0054] In a preferred implementation, the depth of the groove 22 is set to 1 mm to 5 mm. In a specific implementation, the specific depth of the groove 22 can be adjusted according to the outer diameter of the cutting portion 31. Specifically, the depth of the groove 22 can be set to 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, and a value between any two of the above values, or a range between any two of the above values.

[0055] like Figures 3 to 5 As shown, the pole piece cutting device 1 includes two cutters, the first cutting knife 11 is located on one of the two cutters, and the second cutting knife 21 is located on the other of the two cutters. Specifically, the pole piece cutting device 1 includes a first cutter 10 and a second cutter 20, the first cutter 10 includes a first cutting knife 11, the second cutter 20 includes a second cutting knife 21, and the pole piece assembly 200 is arranged between the first cutter 10 and the second cutter 20.

[0056] In other optional examples, the pole piece cutting device 1 includes a cutter, which is provided with a hollow inner cavity, the first cutting knife 11 and the second cutting knife 21 are arranged in the inner cavity of the cutter, and the pole piece assembly 200 enters the inner cavity of the cutter through the open end of the cutter and is located between the first cutting knife 11 and the second cutting knife 21.

[0057] Continue to refer Figures 3 to 5 As shown, the cutter includes a first drive device 13 for driving the first cutting knife 11 and a second drive device 23 for driving the second cutting knife 21. The first drive device 13 and the second drive device 23 are used to synchronously drive the first cutting knife 11 and the second cutting knife 21 to move toward or away from each other, thereby controlling the first cutting knife 11 and the second cutting knife 21 to be in a closed state or an open state.

[0058] When the pole piece cutting device 1 includes two cutters, the first drive device 13 is located on the first cutter 10, and the second drive device 23 is located on the second cutter 20. When the pole piece cutting device 1 includes one cutter, the first drive device 13 and the second drive device 23 are located in the same cutter, and the first drive device 13 and the second drive device can be integrated into one or separately arranged.

[0059] The first drive device 13 and the second drive device 23 can be configured as a drive cylinder, the first drive device 13 is connected to the end of the first cutting knife 11 away from the second cutting knife 21, and the second drive device 23 is connected to the end of the second cutting knife 21 away from the first cutting knife 11. When it is necessary to cut the blank section 220 of the pole piece assembly 200, the first drive device 13 drives the first cutting knife 11 to move in a direction close to the second cutting knife 21, and the second drive device 23 drives the second cutting knife 21 to move in a direction close to the first cutting knife 11 synchronously. After the blank section 220 of the pole piece assembly 200 is cut, the first drive device 13 drives the first cutting knife 11 to move in a direction away from the second cutting knife 21, and the second drive device 23 drives the second cutting knife 21 to move in a direction away from the first cutting knife 11 synchronously.

[0060] Further references Figures 3 to 5 As shown, the first cutter 10 also includes a first support seat 14, and the first driving device 13 and the first cutting knife 11 are fixed on the first support seat 14; the second cutter 20 includes a second support seat 24, and the second driving device 23 and the second cutting knife 21 are fixed on the second support seat 24, the first support seat 14 and the second support seat 24 are arranged at an interval, and the first cutting knife 11 and the second cutting knife 21 are arranged in the interval between the first support seat 14 and the second support seat 24.

[0061] When the first driving device 13 and the second driving device 23 drive the first cutting knife 11 and the second cutting knife 21 to move toward or away from each other, the first supporting seat 14 moves together with the first cutting knife 11, and the second supporting seat 24 moves together with the second cutting knife 21. Correspondingly, the first cutting knife 11 is fixed to the outside of the first supporting seat 14, and the second cutting knife 21 is fixed to the outside of the second supporting seat 24. The first cutting knife 11 and the second cutting knife 21 are both arranged in the interval between the first supporting seat 14 and the second supporting seat 24, and the minimum interval between the first supporting seat 14 and the second supporting seat 24 is configured to accommodate the first cutting knife 11 and the second cutting knife 21.

[0062] Further references Figures 3 to 8As shown, the first cutting knife 11 and the second cutting knife 21 are in the shape of a triangular prism, the width of the first cutting knife 11 decreases in the direction from the first cutting knife 11 to the second cutting knife 21, and the width of the second cutting knife 21 decreases in the direction from the second cutting knife 21 to the first cutting knife 11.

[0063] By setting the first cutting knife 11 and the second cutting knife 21 to be in a triangular prism shape, while maintaining the overall rigidity of the first cutting knife 11 and the second cutting knife 21, it is beneficial for the end of the first cutting knife 11 pointing to the second cutting knife 21 to form a sharp incision 12, and at the same time, the end of the second cutting knife 21 pointing to the first cutting knife 11 forms a relatively sharp end, which helps to clamp the pole piece assembly 200.

[0064] In other optional examples, the first cutting blade 11 and the second cutting blade 21 may also be configured as other polygonal prisms, such as quadrangular prisms, pentagonal prisms or hexagonal prisms, etc. Alternatively, the first cutting blade 11 and the second cutting blade 21 may be configured as plate-like structures.

[0065] In the embodiment of the utility model, the structure of the above-mentioned pole piece cutting device 1 is improved, and the above-mentioned thermal resistance wire 30 is arranged in at least one of the first cutter 10 and the second cutter 20. The thermal resistance wire 30 generates high-temperature heat after being energized. The high-temperature heat is configured to be able to directly cut the blank section 220 of the pole piece assembly 200. Compared with the related art of using a metal mold to physically cut the blank section 220, which will result in continuous cutting, the thermal resistance wire 30 adopts a hot melt cutting method to quickly and effectively cut the blank section 220 of the pole piece assembly 200.

[0066] Furthermore, the pole piece thermal composite equipment 100 provided in the embodiment of the utility model includes the above-mentioned pole piece cutting device 1, and the above-mentioned pole piece cutting device 1 is used to quickly and effectively cut the blank section 220 of the pole piece assembly 200, thereby improving the processing speed of the pole piece thermal composite equipment 100.

[0067] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for technicians in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A pole piece cutting device for cutting a pole piece assembly, wherein the pole piece assembly comprises a plurality of pole piece units and a plurality of blank sections, each of the blank sections being connected between two adjacent pole piece units, characterized in that: The pole piece cutting device comprises: At least two cutting knives, the two cutting knives are configured to move toward or away from each other, so that the two cutting knives are configured to have a closed state and an open state, and the pole piece assembly is located between the two cutting knives; The thermal resistance wire is connected to at least one of the two cutting knives and is used to provide heat to cut the blank section of the pole piece assembly.

2. The pole piece cutting device according to claim 1, characterized in that: The blank section of the pole piece assembly includes two layers of diaphragms, and the operating temperature of the thermal resistance wire is greater than 180°C.

3. The pole piece cutting device according to claim 1 or 2, characterized in that: The two cutting knives include a first cutting knife and a second cutting knife, the first cutting knife is provided with a cutout at one end facing the second cutting knife, the thermal resistance wire includes a cutting portion and an electrical connection portion connected to each other, the cutting portion is exposed to the cutout, and the electrical connection portion is provided inside the first cutting knife.

4. The pole piece cutting device according to claim 3, characterized in that: The cutting portion is in a straight line shape, and the length of the cutting portion is greater than the width of the pole piece assembly; and / or the length of the cutting portion is set to 50 mm to 400 mm.

5. The pole piece cutting device according to claim 3, characterized in that: A groove is provided at one end of the second cutting blade facing the first cutting blade, and the groove is configured to accommodate a part of the cutting portion.

6. The pole piece cutting device according to claim 5, characterized in that: The depth of the groove is set to 1 mm to 5 mm.

7. The pole piece cutting device according to claim 3, characterized in that: The pole piece cutting device comprises two cutters, the first cutting blade is located on one of the two cutters, and the second cutting blade is located on the other of the two cutters; or, The electrode sheet cutting device comprises a cutter, the cutter is provided with a hollow inner cavity, and the first cutting knife and the second cutting knife are arranged in the inner cavity of the cutter.

8. The pole piece cutting device according to claim 7, characterized in that: The cutter includes a first drive device and a second drive device, the first drive device is used to drive the first cutting knife, and the second drive device is used to drive the second cutting knife, the first drive device and the second drive device are used to synchronously drive the first cutting knife and the second cutting knife to move toward each other or away from each other, thereby controlling the first cutting knife and the second cutting knife to be in a closed state or an open state.

9. The pole piece cutting device according to claim 8, characterized in that: The two cutters include a first cutter and a second cutter, the first cutter further includes a first support seat, the first driving device and the first cutting blade are fixed on the first support seat; The second cutter includes a second support seat, the second driving device and the second cutting knife are fixed on the second support seat, the first support seat and the second support seat are spaced apart, and the first cutting knife and the second cutting knife are arranged in the space between the first support seat and the second support seat.

10. The pole piece cutting device according to claim 3, characterized in that: The first cutting blade and the second cutting blade are both configured in a triangular prism shape. The width of the first cutting blade decreases in a direction from the first cutting blade to the second cutting blade, and the width of the second cutting blade decreases in a direction from the second cutting blade to the first cutting blade.

11. A pole piece thermal composite device, characterized in that: The pole piece thermal composite equipment comprises the pole piece cutting device and the laminating device according to any one of claims 1 to 10, and the laminating device is spaced apart from the pole piece cutting device.

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