Lamination device and pole piece thermal compounding equipment

Abstract

The utility model provides a lamination device and pole piece thermal compounding equipment, the lamination device comprises a lamination table used for stacking a plurality of pole piece units to form a battery cell; the first driving roller assembly and the second driving roller assembly are arranged on the same side of the lamination table at an interval and are used for clamping the pole piece assembly so as to drive the pole piece assembly to move; a first interval is arranged between the first driving roller assembly and the second driving roller assembly, the first interval is set to be d1, the length of the pole piece unit is set to be L, d1 is smaller than L or larger than L, and the ratio of d1 to L is a non-integer.

Description

Technical Field

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

[0002] The lamination technology routes of lithium batteries are mainly divided into four categories: Z-shaped lamination, cutting and laminating, rolling and laminating, and thermal composite lamination. The thermal composite lamination process has high production efficiency and has become a new favorite in the field of lamination technology. Thermal composite lamination is to thermally composite the positive electrode sheet, diaphragm, and negative electrode sheet to form a thermal composite electrode unit, and then stack the thermal composite electrode units to form an electrode assembly.

[0003] In the related art, the process of driving and stacking the thermal composite pole piece unit mainly adopts a single driving roller to control the movement of the thermal composite pole piece unit. Since the driving roller is designed as a pair of rollers, the clamping force of the driving roller on the thermal composite pole piece unit is adjusted by the spacing between the pair of rollers. The clamping force of the two driving rollers on the thermal composite pole piece unit is configured at the contact line of the pair of rollers, and the spacing between the two driving rollers is configured to be able to clamp the thermal composite pole piece unit. There is a blank area between two adjacent thermal composite pole piece units and the thermal composite pole piece units of the upper and lower core packages. The blank area is composed of only two layers of diaphragms, and the thermal composite pole piece unit is composed of a layer of positive pole piece, a layer of negative pole piece and two layers of diaphragms. The spacing between the two driving rollers cannot be adjusted. Therefore, when the blank area is between the two driving rollers, the two driving rollers are configured to be unable to clamp the blank area, and the stacking process of the thermal composite pole piece unit is uncontrolled, which in turn affects the alignment of the core package and the energy density of the battery. Utility Model Content

[0004] The embodiments of the utility model provide a lamination device and a pole piece thermal composite device, which can improve the technical problem of loss of control of the thermal composite pole piece unit during the lamination process.

[0005] In a first aspect, an embodiment of the utility model provides a lamination device for processing a pole piece assembly, wherein the pole piece assembly includes a plurality of pole piece units, and the lamination device includes:

[0006] A stacking table, used for stacking a plurality of the pole piece units;

[0007] A first driving roller assembly and a second driving roller assembly are arranged at a same side of the lamination table at intervals and are used to clamp the pole piece assembly to drive the pole piece assembly to move;

[0008] A first interval is provided between the first driving roller assembly and the second driving roller assembly, the first interval is set to d1, the length of the pole piece unit is set to L, d1 is less than L, or d1 is greater than L, and the ratio between d1 and L is a non-integer.

[0009] In one embodiment, the first driving roller assembly includes a first driving roller and a second driving roller that are arranged opposite to each other, and a second gap is formed between the first driving roller and the second driving roller;

[0010] The second driving roller assembly comprises a third driving roller and a fourth driving roller which are arranged opposite to each other, and a third gap is formed between the third driving roller and the fourth driving roller;

[0011] The second interval and the third interval are both set to be no greater than the thickness of the pole piece unit; and / or,

[0012] The second interval and the third interval are both set to be 118 μm to 460 μm.

[0013] In one embodiment, the second interval and the third interval are set to be the same.

[0014] In one embodiment, a driving device is further included, and the driving device is used to drive the first driving roller assembly and / or the second driving roller assembly; the first driving roller and the third driving roller are configured as active rollers, and the second driving roller and the fourth driving roller are configured as driven rollers, and the driving device is configured to be connected only to the active roller and drive the active roller to rotate to drive the pole piece assembly to move, and the outer surface of one of the active roller and the driven roller is configured as a soft and rough surface, and the outer surface of the other one of the active roller and the driven roller is configured as a hard and smooth surface.

[0015] In one embodiment, the rotation speed of the first driving roller assembly is set to 1 rpm / nim to 40 rpm / nim, and the first driving roller assembly can be used to drive the pole piece assembly to move at a speed of 1 m / min to 100 m / min; and / or,

[0016] The rotation speed of the second driving roller assembly is set to 1 rpm / nim to 40 rpm / nim, and the first driving roller assembly can be used to drive the pole piece assembly to move at a speed of 1 m / min to 100 m / min; and / or,

[0017] The rotation speed of the first driving roller and the rotation speed of the second driving roller are configured to be the same.

[0018] In one embodiment, it also includes a first support platform and a second support platform arranged at an interval, the first support platform is installed, the second drive roller assembly is installed on the second support platform, the first drive roller assembly is configured to be able to move on the first support platform, and / or the second drive roller assembly is configured to be able to move on the second support platform.

[0019] In one embodiment, it also includes a first support frame and a second support frame arranged at an interval, the first support frame contains the first drive roller assembly, the second support frame contains the second drive roller assembly, the first support frame is fixed to the first support platform, and / or the second support frame is fixed to the second support platform.

[0020] In one embodiment, it further includes a plurality of blocking members disposed on the lamination table, the plurality of blocking members being used to limit the position of the pole piece assembly, wherein the position of at least a portion of the plurality of blocking members is configured to be adjustable.

[0021] In one embodiment, the first support frame, the second support frame and the stacking platform are arranged in parallel in sequence, and the stacking platform is configured to be movable toward or away from the second support frame.

[0022] In one embodiment, it also includes at least two visual detectors arranged at intervals for monitoring the pole piece assembly, the at least two visual detectors are arranged between the second support platform and the stacking platform, one of the at least two visual detectors is located on one side of the second drive roller assembly, and the other of the at least two visual detectors is located on the other side of the second drive roller assembly.

[0023] In a second aspect, an embodiment of the utility model provides a pole piece thermal composite device, and the pole piece thermal composite device includes the above-mentioned lamination device.

[0024] Beneficial effects of the embodiments of the utility model:

[0025] In an embodiment of the utility model, the stacking process of the pole piece assembly is controlled simultaneously by using the first drive roller assembly and the second drive roller assembly, wherein the first drive roller assembly and the second drive roller assembly are both configured to clamp the pole piece unit, and the first interval d1 between the first drive roller assembly and the second drive roller assembly is controlled to be set to be less than the length of the pole piece unit set to L, or the first interval d1 is set to be greater than the length of the pole piece unit L, and the ratio between d1 and L is a non-positive integer, so that in the stacking process of the pole piece unit, when the blank area is in one of the first drive roller assembly and the second drive roller assembly, the pole piece unit is in the other of the second drive roller assembly and the second drive roller assembly, so that at least one of the first drive roller assembly and the second drive roller assembly can always provide a stable clamping effect on the pole piece unit, effectively preventing the pole piece unit from losing control during the stacking process. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 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.

[0027] Figure 1 It is a structural schematic diagram of a pole piece thermal composite device provided in an embodiment of the utility model;

[0028] Figure 2 is a stereogram of a pole piece assembly provided in an embodiment of the utility model;

[0029] Figure 3 is an exploded view of a pole piece assembly provided in an embodiment of the utility model;

[0030] Figure 4 is a stereoscopic diagram of a lamination device provided in an embodiment of the utility model;

[0031] Figure 5 It is a three-dimensional diagram of another viewing angle of the lamination device provided by an embodiment of the utility model;

[0032] Figure 6 It is a three-dimensional diagram of another viewing angle of the lamination device provided by an embodiment of the utility model;

[0033] Figure 7 yes Figure 6 A partial enlarged view of

[0034] Figure 8 is a perspective view of a first driving roller assembly provided in an embodiment of the utility model;

[0035] Fig. 9 yes Figure 8 A partial enlarged view of

[0036] Fig.10 is a perspective view of a second driving roller assembly provided in an embodiment of the utility model;

[0037] Fig.11 yes Fig.10 A partial enlarged view of

[0038] Description of Figure Numbers:

[0039] 1. Feeding system; 2. Heating device; 3. Hot rolling device; 4. Laminating device; 41. First driving roller assembly; 411. First driving roller; 412. Second driving roller; 413. First support frame; 414. First support platform; 42. Second driving roller assembly; 421. Third driving roller; 422. Fourth driving roller; 423. Second support frame; 424. Second support platform; 43. Laminating platform; 431. Blocking member; 432. Visual detector; 5. Pole piece assembly; 51. Thermal composite pole piece unit; 511. Positive pole piece; 512. Negative pole piece; 513. Diaphragm; 5131. First diaphragm; 5132. Second diaphragm; 52. Blank area; DETAILED DESCRIPTION

[0040] 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.

[0041] The lamination technology routes of lithium batteries are mainly divided into four categories: Z-shaped lamination, cut-to-stack, rolled-to-stack and hot-composite lamination. The hot-composite lamination process has high production efficiency and has become a new favorite in the field of lamination technology. Hot-composite lamination is to thermally composite the positive electrode sheet, diaphragm and negative electrode sheet to form a hot-composite electrode sheet unit, and then stack multiple hot-composite electrode sheet units to form an electrode assembly in a single battery core pack.

[0042] In the related art, the process of driving and stacking the thermal composite pole piece unit mainly adopts a single driving roller assembly to control the movement of the thermal composite pole piece unit. The driving roller assembly is designed as a pair of rollers, and the clamping force of the driving roller assembly on the thermal composite pole piece unit is adjusted by the spacing between the pair of rollers. The clamping force of the driving roller assembly on the thermal composite pole piece unit is set at the contact line between the thermal composite pole piece unit and the pair of rollers, and the spacing between the two driving rollers is configured to be able to clamp the thermal composite pole piece unit.

[0043] There is a blank area between two adjacent thermal composite pole piece units and the thermal composite pole piece units of the upper and lower core packs. The blank area is usually composed of two layers of diaphragms, and the thermal composite pole piece unit is usually composed of a layer of positive pole piece, a layer of negative pole piece and two layers of diaphragms, and the interval between the two driving rollers cannot be adjusted. Therefore, when the blank area is in the interval between the two driving rollers, since the interval between the two driving rollers is greater than the thickness of the blank area, the driving roller assembly cannot clamp the blank area, and then the stacking process of the pole piece assembly is uncontrolled. When the stacking process of a certain pole piece thermal composite unit is out of control, it will cause overhang in the prepared battery core pack, where overhang refers to the fact that the alignment of the positive pole piece and the negative pole piece cannot meet the requirements, thereby affecting the alignment of the battery core pack and the energy density of the battery.

[0044] In view of the above problems, the utility model improves the structure of the driving roller assembly in the lamination device, thereby resolving the above problems.

[0045] like Figure 1 As shown, some embodiments of the utility model provide a pole piece thermal composite device, which includes a feeding system 1, a heating device 2, a hot rolling device 3 and a lamination device 4.

[0046] The feeding system 1 includes a positive electrode sheet feeding system, a negative electrode sheet feeding system, a first diaphragm feeding system and a second diaphragm feeding system. The above-mentioned positive electrode sheet feeding system, negative electrode sheet feeding system, first diaphragm feeding system and second diaphragm feeding system operate simultaneously, wherein the positive electrode sheet feeding system further cuts the positive electrode sheet 511 roll into single positive electrode sheets 511 and conveys them to the heating device 2, and the negative electrode sheet 512 feeding system further cuts the negative electrode sheet 512 roll into single negative electrode sheets 512 and conveys them to the heating device 2.

[0047] Further references Figure 2 and Figure 3 As shown, the thermal composite electrode sheet unit 51 includes a layer of positive electrode sheet 511, a layer of negative electrode sheet 512 and two layers of diaphragm 513. The single positive electrode sheet 511, the first diaphragm 5131, the single negative electrode sheet 512 and the second diaphragm 5132 are stacked in sequence inside the heating device 2. The first diaphragm 5131 and the second diaphragm 5132 are set as glue-coated diaphragms. After being heated by the heating device 2, the glue-coated diaphragms are sticky. The baked single positive electrode sheet 511 and the single negative electrode sheet 512 are thermally composited with the first diaphragm 5131 and the second diaphragm 5132 to form a combination. The combination is further rolled and compacted by the hot rolling device 3 to form the thermal composite electrode sheet unit 51. Two adjacent thermal composite electrode sheet units 51 are connected by the blank area 52.

[0048] A plurality of continuous thermal composite electrode units 51 are stacked by the stacking device 4 to form a battery core pack. Two adjacent thermal composite electrode units 51 are connected by a blank area 52, and the thermal composite electrode units 51 used by two adjacent battery core packs are also connected by the blank area 52, wherein the blank area 52 is configured as two layers of diaphragms 513.

[0049] refer to Figures 2 to 7 As shown, in some embodiments provided in the present application, by improving the structure of the driving roller assembly in the stacking device 4, the driving roller assembly can effectively control the stacking process of the pole piece assembly 5, so that the thermal composite pole piece unit 51 is prepared through the stacking device 4 according to a predetermined stacking route and stacking speed to form a battery core pack with a higher degree of alignment.

[0050] Specifically, the lamination device 4 comprises:

[0051] A stacking table 43, used for stacking a plurality of the electrode units to form a battery core;

[0052] A first driving roller assembly 41 and a second driving roller assembly 42, wherein the first driving roller assembly 41 and the second driving roller assembly 42 are arranged at the same side of the lamination table 43 at intervals, and the first driving roller assembly 41 and the second driving roller assembly 42 are used to simultaneously drive the pole piece assembly 5 to move, and the first driving roller assembly 41 and the second driving roller assembly 42 are both configured to clamp the pole piece unit;

[0053] A first interval is provided between the first driving roller assembly 41 and the second driving roller assembly 42, the first interval is set to d1, the length of the pole piece unit is set to L, d1 is less than L, or d1 is greater than L, and the ratio between d1 and L is a non-positive integer.

[0054] In a specific implementation, the ratio between d1 and L can be 0.1-0.9, 1.1-1.9, 2.1-2.9, 3.1-3.9, 4.1-4.9, 5.1-5.9, 6.1-6.9, 7.1-7.9, 8.1-8.9, 9.1-9.9 and any range between the above numerical ranges, which are not listed one by one in this application.

[0055] In an embodiment of the present application, the stacking process of the pole piece assembly 5 is controlled simultaneously by using the first drive roller assembly 41 and the second drive roller assembly 42, wherein the first drive roller assembly 41 and the second drive roller assembly 42 are both configured to clamp the thermal composite pole piece unit 51, and the first interval d1 between the first drive roller assembly 41 and the second drive roller assembly 42 is controlled to be set to be less than the length of the pole piece unit L, or the first interval d1 is set to be greater than the length of the pole piece unit L, and the ratio between d1 and L is a non-positive integer, so that in the stacking process of the thermal composite pole piece unit 51, when the blank area 52 is in one of the first drive roller assembly 41 and the second drive roller assembly 42, the thermal composite pole piece unit 51 is in the other of the second drive roller assembly 42 and the second drive roller assembly 42, so that at least one of the first drive roller assembly 41 and the second drive roller assembly 42 can always provide a stable clamping effect on the thermal composite pole piece unit 51, effectively preventing the thermal composite pole piece unit 51 from losing control during the stacking process.

[0056] In a specific implementation, when the interval between the first drive roller assembly 41 and the stacking device 4 is small, the first interval d1 is preferably set to be smaller than the length L of the thermal composite pole piece unit 51. Therefore, when the blank area 52 is in the first drive roller assembly 41, the pole piece thermal composite unit adjacent to the blank area 52 is in the second interval of the second drive roller assembly 42, so that the second drive roller assembly 42 can provide a stable clamping force to the thermal composite pole piece unit 51. If the first interval d1 is set to be equal to the length of the thermal composite pole piece unit 51, then when the blank area 52 is in the first drive roller assembly 41, the next blank area 52 set adjacent to the blank area 52 is in the second drive roller assembly 42, which will cause the second drive roller assembly 42 to be unable to provide a stable clamping force to the pole piece assembly 5, thereby causing the stacking process of the pole piece assembly 5 to be out of control.

[0057] When the interval between the first drive roller assembly 41 and the lamination table 43 is large, the first interval d1 is set to be larger than the length of the thermal composite pole piece unit 51, and the ratio between d1 and L is set to a non-integer. Therefore, when the blank area 52 is in the first drive roller assembly 41, the thermal composite pole piece unit 51 should be in the second interval of the second drive roller assembly 42, so that the second drive roller assembly 42 can provide a stable clamping force to the thermal composite pole piece unit 51.

[0058] Furthermore, compared to the related art, the interval between the drive roller assemblies is set to be adjustable. In order to increase the thermal recombination speed of the pole piece unit, the stacking speed of the pole piece assembly 5 is relatively fast, so the interval between the drive roller assemblies cannot be adjusted instantly, and it is also necessary to make precise adjustments in combination with the specific stacking position of the pole piece assembly 5. It is also difficult to achieve precise and efficient stacking control of the entire pole piece assembly 5. In the implementation of the present application, by setting two drive roller assemblies on the moving path of the pole piece assembly 5, while maintaining the high-speed stacking of the pole piece assembly 5, it is also possible to improve the problem that the blank area 52 cannot be clamped by a single drive roller assembly, resulting in a stacking process out of control.

[0059] Further references Figures 4 to 11 As shown, the first drive roller assembly 41 includes a first drive roller 411 and a second drive roller 412 that are arranged opposite to each other, and a second interval d2 is formed between the first drive roller 411 and the second drive roller 412. The second drive roller assembly 42 is located between the first drive roller assembly 41 and the lamination table 43, and the second drive roller assembly 42 includes a third drive roller 421 and a fourth drive roller 422 that are arranged opposite to each other, and a third interval d3 is formed between the third drive roller 421 and the fourth drive roller 422; the first drive roller assembly 41 and the second drive roller assembly 42 are used to simultaneously drive the pole piece assembly 5 to move, and the second interval d2 and the third interval d3 are both set to be not less than the thickness of the pole piece unit 51, and / or, the second interval d2 and the third interval d3 are both set to be not less than 118μm, and the second interval d2 and the third interval d3 are both set to be not more than 460μm.

[0060] Among them, the electrode unit 51 that is thermally composited by a thermal composite device usually includes two layers of diaphragms 513, a layer of positive electrode sheet 511 and a layer of negative electrode sheet 512. The thickness of the thermally composite electrode unit 51 is set to the sum of the thickness of the two layers of diaphragms 513, the thickness of the positive electrode sheet 511 and the thickness of the negative electrode sheet 512. Among them, the thickness of the single-layer diaphragm 513 is set to 9μm~30μm, the thickness of the positive electrode plate 511 is set to 50μm~200μm, the thickness of the negative electrode plate 512 is set to 50μm~200μm, and the thickness of the thermal composite electrode plate unit 51 is set to 118μm~460μm. In one example, the thickness of the blank area 52 is 24μm, the thickness of the thermal composite electrode plate unit 51 is 344μm, the second interval d2 and the third interval d3 are both set to 344μm, or the second interval d2 and the third interval d3 are set to 300μm~344μm, so that the first drive roller assembly 41 and the second drive roller assembly 42 can both provide sufficient clamping force to the thermal composite electrode plate unit 51.

[0061] Furthermore, if the second interval d2 or the third interval d3 is outside the above range, the first drive roller assembly 41 and the second drive roller assembly 42 cannot provide a suitable clamping effect on the thermal composite pole piece unit 51, thereby affecting the stacking process of the pole piece assembly. For example, if the second interval d2 or the third interval d3 is less than 118 μm, the interval between the first drive roller assembly 41 and the second drive roller assembly 42 is too small, and the thermal composite pole piece unit 51 is difficult to pass through the second interval d2 or the third interval d3, thereby causing the first drive roller assembly 41 and the second drive roller assembly 42 to be unable to effectively drive the thermal composite pole piece unit 51. When the second interval d2 or the third interval d3 is greater than 460 μm, the interval between the first drive roller assembly 41 and the second drive roller assembly 42 is too large, causing the first drive roller assembly 41 and the second drive roller assembly 42 to be unable to provide an effective clamping force on the thermal composite pole piece unit 51.

[0062] In a specific implementation, the second interval d2 and the third interval d3 can be adjusted according to the different thicknesses of the thermal composite pole piece unit 51. For example, when the thickness of the thermal composite pole piece unit 51 to be laminated is set to 250 μm, the second interval d2 of the first drive roller assembly 41 and the third interval d3 of the second drive roller assembly 42 are adjusted to 250 μm. When the thickness of the thermal composite pole piece unit 51 to be laminated is set to 300 μm, the second interval d2 of the first drive roller assembly 41 and the third interval d3 of the second drive roller assembly 42 are adjusted to 300 μm.

[0063] The second interval d2 and the third interval d3 are preferably configured to be the same, so that the pole piece assembly 5 can pass through the first drive roller assembly 41 and the second drive roller assembly 42 at the same speed, thereby maintaining the stability of the stacking process of the pole piece assembly 5. For example, when the third interval d3 is smaller than the second interval d2, the resistance encountered by the pole piece assembly 5 when the thermal composite unit passes through the second drive roller assembly 42 is smaller than the resistance encountered by the thermal composite unit when passing through the first drive roller assembly 41. Or when the third interval d3 is significantly larger than the second interval d2, when the thermal composite unit passes through the first drive roller assembly 41 in a straight line and then enters the third interval d3 of the second drive roller assembly 42, since the third interval d3 is significantly larger than the second interval d2, the thermal composite pole piece unit 51 may be offset in the excessively large interval, thereby affecting the stability of the stacking process.

[0064] It should be noted that the sameness between the above-mentioned second interval d2 and the third interval d3, in addition to including the second interval d2 and the third interval d3 being completely identical, can also be defined as the second interval d2 and the third interval d3 being the same within an allowable error range. For example, the second interval d2 and the third interval d3 are both set to 200μm±5μm. When the second interval d2 and the third interval d3 are both within this range, the second interval d2 and the third interval d3 can still be considered to be the same.

[0065] The above-mentioned lamination device 4 also includes a driving device (not shown in the figure), which is used to drive the first driving roller assembly 41 and / or the second driving roller assembly 42; the first driving roller 411 and the third driving roller 421 are set as active rollers, and the second driving roller 412 and the fourth driving roller 422 are set as driven rollers, and the driving device is configured to be connected only to the active rollers, and the outer surface of the active roller is set as a soft and rough surface, and the outer surface of the driven roller is set as a hard and smooth surface.

[0066] The above-mentioned driving device can be set as one or more of an electric driving device, a hydraulic driving device, a friction driving device and a gear driving device, wherein the first driving roller assembly 41 and the second driving roller assembly 42 can be configured to share a driving device, or the first driving roller assembly 41 and the second driving roller assembly 42 can be configured with a driving device respectively.

[0067] One of the first drive roller 411 and the second drive roller 412 is set as an active roller, and the other of the first drive roller 411 and the second drive roller 412 is set as a driven roller, one of the third drive roller 421 and the fourth drive roller 422 is set as an active roller, and the other of the third drive roller 421 and the fourth drive roller 422 is set as a driven roller.

[0068] The active roller is configured to be connected to a driving device, and the driven roller is connected to the active roller through a transmission device, which includes a chain, a gear, and a belt, etc. The active roller controls the rotation speed and rotation direction of the driven roller, so that the first drive roller assembly 41 and the second drive roller assembly 42 can operate stably.

[0069] By controlling the opening and closing of the driving device, the opening and closing of the first driving roller assembly 41 and the second driving roller assembly 42 are controlled, and by controlling the power or speed of the driving device, the rotation speed of the second driving roller assembly 42 and the second driving roller assembly 42 are controlled.

[0070] Furthermore, by setting the outer surface of the active roller to a soft and rough surface, and the outer surface of the driven roller to a hard and smooth surface, the first drive roller assembly 41 and the second drive roller assembly 42 are both configured to have a stable clamping effect on the thermal composite pole piece unit 51, and the second interval d2 or the third interval d3 defined by the active roller and the driven roller can be autonomously adjusted in a small range, thereby preventing the first drive roller assembly 41 and the second drive roller assembly 42 from crushing the surface of the thermal composite pole piece unit 51.

[0071] Specifically, the outer surface of the active roller is configured as a soft and rough surface, and the outer surface of the driven roller is configured as a hard and smooth surface, so that the interval defined between the active roller and the driven roller can be adjusted autonomously, and when the second interval d2 and the third interval d3 defined between the active roller and the driven roller can provide a stable clamping effect on the thermal composite pole piece unit 51, it can be autonomously adjusted according to the thickness difference of the clamped thermal composite pole piece unit 51 itself. For example, when the thickness of the thermal composite pole piece unit 51 is set to 330μm±5μm, the second interval d2 of the first drive roller assembly 41 and the third interval d3 of the second drive roller assembly 42 are set to 330μm, when the thickness of the thermal composite pole piece unit 51 passing through the first drive roller assembly 41 is 335μm, if the interval defined by the active roller and the driven roller cannot be autonomously adjusted, the active roller and the driven roller will squeeze the thermal composite pole piece unit 51 when the thermal composite pole piece unit 51 passes through the second interval d2 and the third interval d3, thereby causing damage to the outer surface of the thermal composite pole piece unit 51.

[0072] It is understandable that if the outer surfaces of the active roller and the driven roller are both configured as hard and smooth surfaces, the interval between the active roller and the driven roller cannot be adjusted autonomously.

[0073] In some embodiments, the rotational speed of the first drive roller assembly 41 is set to 1rpm / nim~40rpm / nim, and the first drive roller assembly 41 can be used to drive the pole piece assembly 5 to move at a speed of 1m / min~100m / min; and / or, the rotational speed of the second drive roller assembly 42 is set to 1rpm / nim~40rpm / nim, and the first drive roller assembly 41 can be used to drive the pole piece assembly 5 to move at a speed of 1m / min~100m / min; and / or, the rotational speed of the first drive roller assembly 41 and the rotational speed of the second drive roller assembly 42 are configured to be the same.

[0074] In a specific implementation, the first drive roller 411 and the second drive roller 412 are configured as cylindrical rollers, the third drive roller 421 and the fourth drive roller 422 are configured as cylindrical rollers, the outer radius of the first drive roller 411, the second drive roller 412, the third drive roller 421 and the fourth drive roller 422 are all configured to be 40 mm, and the first drive roller 411, the second drive roller 412, the third drive roller 421 and the fourth drive roller 422 are configured to have the same rotation speed. Taking the first drive roller assembly 41 as an example for explanation, the rotation speed of the first drive roller assembly 41 is The speed is set to 1rpm / nim~40rpm / nim, and the first driving roller assembly 41 can be used to drive the pole piece assembly 5 to move at a speed of 1m / min~100m / min. It can be understood that the greater the rotation speed of the first driving roller assembly 41, the faster the movement speed of the pole piece assembly 5 driven by the first driving roller assembly 41. Therefore, the rotation speed of the first driving roller assembly 41 can be set to any value between 1rpm / nim and 40rpm / nim according to the movement speed of the pole piece assembly 5 to be driven. Specifically, the rotational speed of the first driving roller assembly 41 can be set to 5rpm / nim, 10rpm / nim, 15rpm / nim, 20rpm / nim, 25rpm / nim, 30rpm / nim, 35rpm / nim, and a rotational speed value between any two of the above values ​​or a rotational speed range between any two of the above values. Correspondingly, the first driving roller assembly 41 can be used to drive the pole piece assembly 5 to move at a speed of 10m / min, 20m / min, 30m / min, 40m / min, 50m / min, 60m / min, 70m / min, 80m / min, 90m / min, and a movement speed value between any two of the above values ​​or a movement speed range between any two of the above values.

[0075] Further references Figures 4 to 6 As shown, the lamination device 4 also includes a first support platform 414 and a second support platform 424 that are spaced apart, the first support platform 414 being used to fix the first drive roller assembly 41, the second support platform 424 being used to fix the second drive roller assembly 42, the first drive roller assembly 41 being configured to be able to move on the first support platform 414, and / or the second drive roller assembly 42 being configured to be able to move on the second support platform 424.

[0076] By configuring the first drive roller assembly 41 to be movable to the left and to the right on the first support platform 414, and configuring the second drive roller assembly 42 to be movable to the left and to the right on the second support platform 424, the thermal composite pole piece unit 51 can be configured as a Z-shaped stack. Specifically, by controlling the first drive roller assembly 41 on the first support platform 414 and the second drive roller assembly 42 on the second support platform 424 to move to the left or to the right at the same speed, the first drive roller assembly 41 and the second drive roller assembly 42 simultaneously control the pole piece assembly 5 to move to the left or to the right at the same speed, so that the thermal composite pole piece unit 51 is stacked on the stacking platform 43 in a Z-shaped reciprocating stacking manner.

[0077] In a specific implementation, a first slide rail for the first driving roller assembly 41 to move leftward or rightward is disposed on the first supporting platform 414 , and a slide rail for the second driving roller assembly 42 to move leftward or rightward is disposed on the second supporting platform 424 .

[0078] Further references Figures 4 to 6 As shown, the lamination device 4 also includes a first support frame 413 and a second support frame 423 that are spaced apart, the first drive roller assembly 41 is accommodated inside the first support frame 413, the second drive roller assembly 42 is accommodated inside the second support frame 423, the first support frame 413 and the second support frame 423 are placed in parallel, and the first support frame 413 is configured to be approximately perpendicular to the first support platform 414, and the second support frame 423 is configured to be approximately perpendicular to the second support platform 424.

[0079] A first slide groove is arranged at the bottom of the first support frame 413, and the first slide groove is arranged to slide to the left or to the right in the first slide rail. A second slide groove is arranged at the bottom of the second support frame 423, and the second slide groove is arranged to slide to the left or to the right in the second slide rail.

[0080] Further references Figures 4 to 6 As shown, the lamination device 4 also includes a plurality of blocking members 431 disposed on the lamination platform 43, and the plurality of blocking members 431 are used to limit the position of the pole piece assembly 5, wherein the position of at least a portion of the plurality of blocking members 431 is configured to be adjustable.

[0081] In a specific implementation, a plurality of blocking members 431 may be respectively arranged on the left side, right side, front side and rear side of the lamination platform 43, and the area enclosed by the plurality of blocking members 431 defines the stacking area of ​​the thermal composite electrode sheet, and the stacking area is defined as the position and size of the area where the thermal composite electrode sheet unit 51 is laid flat on the lamination platform 43. By adjusting the position of at least a portion of the blocking members 431 arranged on the left side, right side, front side and rear side of the lamination platform 43, the size of the stacking area of ​​the thermal composite electrode sheet can be adjusted. For example, the size of the thermal composite electrode sheet unit 51 can be controlled according to the size of the prepared battery core pack, and the position of the stacking area on the lamination platform 43 can be adjusted by adjusting the position of at least a portion of the blocking members 431 on the lamination platform 43.

[0082] Furthermore, the first support frame 413 , the second support frame 423 , and the stacking platform 43 are sequentially arranged in parallel, and the stacking platform 43 is configured to be movable toward or away from the second support frame 423 .

[0083] When the stacking size of the thermal composite pole piece unit 51 is large, the stacking platform 43 can be set to move in a direction away from the second support frame 423, so that sufficient spacing is set between the second support frame 423 and the stacking platform 43 to facilitate the thermal composite pole piece unit 51 to be stacked on the stacking platform 43 in a Z-shaped folding manner. When the stacking size of the thermal composite pole piece unit 51 is small, the stacking platform 43 can be set to move in a direction close to the second support frame 423, thereby reducing the spacing between the second support frame 423 and the stacking platform 43 so that the thermal composite pole piece unit 51 can be stacked on the stacking platform 43 in a shorter path, thereby improving the stacking efficiency.

[0084] like Figures 4 to 6 As shown, the lamination device 4 also includes at least two visual detectors 432 arranged at intervals for monitoring the pole piece assembly 5, and the at least two visual detectors 432 are arranged between the second support platform 424 and the lamination platform 43, one of the at least two visual detectors 432 is located on one side of the second drive roller assembly 42, and the other of the at least two visual detectors 432 is located on the other side of the second drive roller assembly 42.

[0085] By arranging two visual detectors 432 between the second driving roller assembly 42 and the lamination table 43, the two visual detectors 432 are respectively located on both sides of the thermal composite pole piece unit 51, so that the stacking process of the thermal composite pole piece unit 51 can be fully monitored, and the alignment of the battery core pack prepared by the lamination device 4 can be further improved.

[0086] The implementation of the present application also provides a method for processing a pole piece assembly 5, the processing method comprising:

[0087] A positive electrode sheet 511, a first separator 5131, a negative electrode sheet 512, and a second separator 5132 are thermally composited to form a thermal composite electrode sheet unit 51;

[0088] The first driving roller assembly 41 and the second driving roller assembly 42 are driven, and the first driving roller assembly 41 and the second driving roller assembly 42 simultaneously drive the pole piece assembly 5 to move toward the direction close to the lamination table 43, and the thermal composite pole piece unit 51 passes through the first driving roller assembly 41 and the second driving roller assembly 42 in sequence;

[0089] The lamination device 4 stacks a plurality of the thermal composite electrode units 51 to form a battery core pack.

[0090] By using the first drive roller assembly 41 and the second drive roller assembly 42 to simultaneously drive and control the stacking process of the pole piece assembly 5, it is possible to effectively avoid the problem that a single drive roller assembly cannot provide effective clamping effect on the blank area 52 in the pole piece assembly 5, thereby causing the stacking process of the pole piece assembly 5 to get out of control.

[0091] The processing method of the pole piece assembly 5 further includes:

[0092] The position of the first driving roller assembly 41 on the first supporting platform 414 is adjusted, and / or the position of the second driving roller assembly 42 on the second supporting platform 424 is adjusted, thereby adjusting the position of the thermal composite pole piece unit 51 relative to the lamination platform 43 .

[0093] For example, by synchronously adjusting the position of the first drive roller assembly 41 at the first support platform 414 and the position of the second drive roller assembly 42 at the second support platform 424, the first drive roller assembly 41 and the second drive roller assembly 42 can drive the pole piece assembly 5 to be stacked on the stacking platform 43 in a Z-shaped stacking manner.

[0094] 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 lamination device for processing a pole piece assembly, wherein the pole piece assembly comprises a plurality of pole piece units, characterized in that: The lamination device comprises: A stacking table, used for stacking a plurality of the pole piece units; and A first driving roller assembly and a second driving roller assembly are arranged at a same side of the lamination table at intervals and are used to clamp the pole piece assembly to drive the pole piece assembly to move; A first interval is provided between the first drive roller assembly and the second drive roller assembly, the width of the first interval is set to d1, and the length of the pole piece unit is set to L; wherein d1 is less than L, or d1 is greater than L and the ratio between d1 and L is a non-integer.

2. The lamination device according to claim 1, characterized in that: The first driving roller assembly comprises a first driving roller and a second driving roller which are arranged opposite to each other, and a second gap is formed between the first driving roller and the second driving roller; The second driving roller assembly comprises a third driving roller and a fourth driving roller which are arranged opposite to each other, and a third gap is formed between the third driving roller and the fourth driving roller; The second interval and the third interval are both set to be no greater than the thickness of the pole piece unit; and / or, The second interval and the third interval are both set to be 118 μm to 460 μm.

3. The lamination device according to claim 2, characterized in that: The second interval and the third interval are set to be the same.

4. The lamination device according to claim 2, characterized in that: It also includes a driving device, which is used to drive the first driving roller assembly and the second driving roller assembly; the first driving roller and the third driving roller are configured as active rollers, and the second driving roller and the fourth driving roller are configured as driven rollers, and the driving device is configured to be connected to the active rollers and drive the active rollers to rotate to drive the pole piece assembly to move, and the outer surface of one of the active roller and the driven roller is configured as a soft and rough surface, and the outer surface of the other one of the active roller and the driven roller is configured as a hard and smooth surface.

5. The lamination device according to any one of claims 1 to 4, characterized in that: The rotation speed of the first driving roller assembly is set to 1 rpm / nim to 40 rpm / nim, and the first driving roller assembly can be used to drive the pole piece assembly to move at a speed of 1 m / min to 100 m / min; and / or, The rotation speed of the second driving roller assembly is set to 1 rpm / nim to 40 rpm / nim, and the first driving roller assembly can be used to drive the pole piece assembly to move at a speed of 1 m / min to 100 m / min; and / or, The rotation speed of the first driving roller and the rotation speed of the second driving roller are configured to be the same.

6. The lamination device according to claim 1, characterized in that: It also includes a first support platform and a second support platform that are spaced apart, the first drive roller assembly is mounted on the first support platform, the second drive roller assembly is mounted on the second support platform, the first drive roller assembly is configured to be able to move on the first support platform, and / or the second drive roller assembly is configured to be able to move on the second support platform.

7. The lamination device according to claim 6, characterized in that: It also includes a first support frame and a second support frame arranged at an interval, the first support frame contains the first drive roller assembly, the second support frame contains the second drive roller assembly, the first support frame is fixed to the first support platform, and / or the second support frame is fixed to the second support platform.

8. The lamination device according to claim 7, characterized in that: It also includes a plurality of blocking members arranged on the lamination table, the plurality of blocking members are used to limit the position of the pole piece assembly, wherein the position of at least a part of the plurality of blocking members is configured to be adjustable.

9. The lamination device according to claim 8, characterized in that: The first support frame, the second support frame and the stacking platform are arranged in parallel in sequence, and the stacking platform is configured to be movable toward or away from the second support frame.

10. The lamination device according to claim 6, characterized in that: It also includes at least two visual detectors arranged at intervals for monitoring the pole piece assembly, wherein the at least two visual detectors are arranged between the second support platform and the stacking platform, one of the at least two visual detectors is located on one side of the second drive roller assembly, and the other of the at least two visual detectors is located on the other side of the second drive roller assembly.

11. A pole piece thermal composite device, characterized in that: The pole piece thermal composite equipment comprises the lamination device according to any one of claims 1-10.

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