Stacking device, method for manufacturing electrode plate assembly, and electrode plate thermal lamination apparatus

Abstract

Provided in the present application are a stacking device, a method for manufacturing an electrode plate assembly, and an electrode plate thermal lamination apparatus. The stacking device comprises a stacking table, a first driving roller assembly and a second driving roller assembly, wherein a first interval d1 is provided between the first driving roller assembly and the second driving roller assembly, and the length of an electrode plate unit is defined as L, where d1 is smaller than L, or d1 is greater than L, and the ratio of d1 to L is a non-integer.

Description

Lamination device, pole piece assembly processing method and pole piece thermal composite equipment

[0001] This application claims priority to Chinese patent applications filed with the China Patent Office on April 10, 2024, with application numbers 202410431353.0 and 202420745017.9, filed with the China Patent Office on January 9, 2024, with application number 202410034237.5, and filed with the China Patent Office on May 29, 2024, with application number 202421212877.2. The entire contents of the above applications are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a lamination device, a processing method for a pole piece assembly, and a pole piece thermal composite device. Background Art

[0003] Lithium battery lamination technology routes are mainly divided into four categories: Z-shaped lamination, cut-and-stack lamination, roll-and-stack lamination, and thermal composite lamination. Thermal composite lamination, with its high production efficiency, has become a new favorite in the lamination technology field. Thermal composite lamination involves thermally combining the positive electrode sheet, separator, and negative electrode sheet to form a thermal composite electrode unit, which is then stacked to form an electrode assembly.

[0004] In the related art, the process of driving and stacking the thermal composite electrode unit mainly uses a single drive roller to control the movement of the thermal composite electrode unit. Since the drive roller is a pair of rollers, the clamping force of the drive roller on the thermal composite electrode unit is adjusted by the spacing between the rollers. The clamping force of the two drive rollers on the thermal composite electrode unit is configured at the contact line of the rollers, and the spacing between the two drive rollers is configured to clamp the thermal composite electrode unit. There is a blank area between two adjacent thermal composite electrode units and the thermal composite electrode units of the upper and lower core packs. This blank area is composed of only two layers of diaphragms. The thermal composite electrode unit is composed of a positive electrode layer, a negative electrode layer, and two layers of diaphragms. SUMMARY OF THE INVENTION

[0005] In the related art, the interval 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 electrode unit is uncontrolled, thereby affecting the alignment of the core package and the energy density of the battery.

[0006] In a first aspect, an embodiment of the present application provides a lamination device configured to process a pole piece assembly, wherein the pole piece assembly includes a plurality of pole piece units, and the lamination device includes:

[0007] A stacking platform, configured to stack a plurality of the pole piece units;

[0008] A first driving roller assembly and a second driving roller assembly are spaced apart and arranged on the same side of the lamination table, and are configured to clamp the pole piece assembly to drive the pole piece assembly to move;

[0009] A first interval is provided between the first drive roller assembly and the second drive 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.

[0010] In a second aspect, an embodiment of the present application provides a method for processing a pole piece assembly, wherein the pole piece assembly is processed using a lamination device, and the processing method includes:

[0011] Providing a pole piece unit, the pole piece unit comprising a positive pole piece, a first diaphragm, a negative pole piece and a second diaphragm stacked in sequence;

[0012] Driving the first drive roller assembly and the second drive roller assembly, wherein the first drive roller assembly and the second drive roller assembly simultaneously drive the pole piece unit to move toward the lamination table, and the pole piece unit passes through the first drive roller assembly and the second drive roller assembly in sequence;

[0013] The lamination table stacks the plurality of pole piece units to form a battery core pack.

[0014] In one embodiment, the processing method further comprises:

[0015] The position of the first driving roller assembly on the first support platform is adjusted, and / or the position of the second driving roller assembly on the second support platform is adjusted, thereby adjusting the position of the pole piece unit relative to the lamination platform.

[0016] In a third aspect, an embodiment of the present application provides a pole piece thermal composite device, which includes the above-mentioned lamination device and a hot rolling device, and the hot rolling device is configured to hot roll the positive pole piece, the diaphragm and the negative pole piece to form a hot composite pole piece unit and then provide it to the lamination device. Beneficial effects

[0017] (1) The stacking device provided in the present application controls the stacking process of the pole piece assembly simultaneously by using a first drive roller assembly and a 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 by controlling the first interval d1 between the first drive roller assembly and the second drive roller assembly to be set to be less than the length L of the pole piece unit, or the first interval d1 to be set to be greater than the length L of the pole piece unit, 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.

[0018] (2) The processing method of the pole piece assembly provided in the present application adopts the above-mentioned lamination device for processing, and uses the first drive roller assembly and the second drive roller assembly to simultaneously drive and control the lamination process of the pole piece assembly, thereby effectively avoiding the situation where a single drive roller assembly cannot provide an effective clamping effect on the blank area in the pole piece assembly and causes the lamination process of the pole piece assembly to be out of control.

[0019] (3) The thermal composite equipment provided in this application is designed based on the above-mentioned lamination device. Its beneficial effects can be found in the beneficial effects of the above-mentioned lamination device, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG1 is a schematic structural diagram of a pole piece thermal composite device provided in Example 1 of the present application;

[0021] FIG2 is a perspective view of a pole piece assembly provided in Example 1 of the present application;

[0022] FIG3 is an exploded view of a pole piece assembly provided in Example 1 of the present application;

[0023] FIG4 is a perspective view of a lamination device provided in Example 1 of the present application;

[0024] FIG5 is a perspective view of the lamination device provided in Example 1 of the present application from another perspective;

[0025] FIG6 is a perspective view of the lamination device provided in Example 1 of the present application from another perspective;

[0026] FIG7 is a partial enlarged view of FIG6;

[0027] FIG8 is a perspective view of a first driving roller assembly provided in Example 1 of the present application;

[0028] FIG9 is a partial enlarged view of FIG8;

[0029] FIG10 is a perspective view of a second driving roller assembly provided in Example 1 of the present application;

[0030] FIG11 is a partial enlarged view of FIG10;

[0031] FIG12 is a perspective schematic diagram of a lamination device provided in Example 2 of the present application;

[0032] FIG13 is a perspective schematic diagram of the lamination device provided in Example 2 of the present application from another perspective;

[0033] FIG14 is a flow chart of a thermal composite process provided in Example 3 of the present application;

[0034] FIG15 is a flow chart of another thermal composite process provided in Example 3 of the present application;

[0035] FIG16 is a schematic structural diagram of a lamination device of related art;

[0036] FIG17 is a perspective view of a lamination device provided in Example 3 of the present application;

[0037] FIG18 is a top view of the stacking platform provided in Example 3 of the present application;

[0038] FIG19 is an enlarged view of point A in FIG17;

[0039] FIG20 is an enlarged view of point B in FIG18;

[0040] FIG21 is a perspective view of a lamination device provided by one embodiment of the present application from another perspective;

[0041] FIG22 is a perspective view of a lamination device provided by one embodiment of the present application from another perspective;

[0042] Description of Figure Numbers:

[0043] 1. Lamination device; 30. Driving mechanism; 310. Driving roller assembly; 31. First driving roller assembly;

[0044] 311. First drive roller; 312. Second drive roller; 320. Support frame; 330. Support seat; 340. First guide rail; 313. First support frame; 314. First support platform; 32. Second drive roller assembly; 321. Third drive roller; 322. Fourth drive roller; 323. Second support frame; 324. Second support platform; 33. Roller drive member; 35. Drive roller position adjustment member; 351. Second mounting portion; 352. Second adjustment portion; 6. Feeding system; 7. Heating device; 8. Hot roller pressing device; 9. Monitor; 91, first monitor; 92, second monitor; 5, thermal composite electrode assembly; 51, thermal composite electrode unit; 510, one side of the thermal composite electrode unit; 520, the other side of the thermal composite electrode unit; 511, positive electrode; 512, negative electrode; 513, diaphragm; 5131, first diaphragm; 5132, second diaphragm; 52, blank area; 10, receiving assembly; 11, lamination table; 110, side plate; X, first direction; 12, limiter; 121, first baffle; 122, second baffle; 1 23. Third baffle; 124. Fourth baffle; 13. Stacking drive member; 14. Stacking position adjustment member; 141. First mounting portion; 142. First adjustment portion; 16. Second guide rail; 131. First support portion; 132. Second support portion; 151. First side; 152. Second side; 20. Pressing mechanism; 21. First pressing mechanism; 211. First pressing device; 212. Second pressing device; 22. Second pressing mechanism; 221. Third pressing device; 222. Fourth pressing device; 231. First drive member Part; 232, second driving member; 233, third driving member; 234, fourth driving member; 241, first pressing member; 242, second pressing member; 243, third pressing member; 244, fourth pressing member; 251, first connecting part; 252, second connecting part; 253, third connecting part; 254, fourth connecting part; 255, first connecting section; 256, second connecting section; 261, first pressing part; 262, second pressing part; 263, third pressing part; 264, fourth pressing part; 101, shaping cylinder. Modes for Carrying Out the Invention

[0045] Example 1

[0046] Lithium battery lamination technology routes are mainly divided into four categories: Z-shaped lamination, cut-and-stack lamination, roll-and-stack lamination, and thermal composite lamination. Thermal composite lamination has become a new favorite in the lamination field due to its high production efficiency. Thermal composite lamination involves thermally combining the positive electrode sheet, separator, and negative electrode sheet to form a thermal composite sheet unit. Multiple thermal composite sheet units are then stacked to form the electrode assembly within a single battery pack.

[0047] In related art, the process of driving and stacking a thermal composite electrode unit primarily utilizes a single drive roller assembly to control the movement of the thermal composite electrode unit. The drive roller assembly is a pair of rollers, and the clamping force of the drive roller assembly on the thermal composite electrode unit is adjusted by the spacing between the rollers. The clamping force of the drive roller assembly on the thermal composite electrode unit is set at the contact line between the thermal composite electrode unit and the rollers, and the spacing between the two drive rollers is configured to clamp the thermal composite electrode unit.

[0048] There is a blank area between two adjacent thermal composite electrode units and the thermal composite electrode units of the upper and lower core packs. The blank area is usually composed of two layers of diaphragms, and the thermal composite electrode unit is usually composed of a layer of positive electrode, a layer of negative electrode and two layers of diaphragms. The gap between the two drive rollers cannot be adjusted. Therefore, when the blank area is in the gap between the two drive rollers, since the gap between the two drive rollers is greater than the thickness of the blank area, the drive roller assembly cannot clamp the blank area, and the stacking process of the electrode assembly is uncontrolled. When the stacking process of a certain electrode thermal composite unit is out of control, it will cause the prepared battery core pack to overhang, where overhang means that the alignment of the positive electrode sheet and the negative electrode sheet cannot meet the requirements, thereby affecting the alignment of the battery core pack and the energy density of the battery.

[0049] The present application improves the structure of the drive roller assembly in the lamination device. As shown in Figure 1, some embodiments of the present application provide a pole piece thermal composite device, which includes a feeding system 6, a heating device 7, a hot rolling device 8 and a lamination device 1.

[0050] The feeding system 6 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 positive electrode sheet feeding system, the negative electrode sheet feeding system, the first diaphragm feeding system and the second diaphragm feeding system operate simultaneously. The positive electrode sheet feeding system cuts the positive electrode sheet 511 roll into single positive electrode sheets 511 and conveys them to the heating device 7. The negative electrode sheet 512 feeding system cuts the negative electrode sheet 512 roll into single negative electrode sheets 512 and conveys them to the heating device 7.

[0051] 2 and 3 , the thermal composite electrode unit 51 includes a layer of positive electrode sheet 511, a layer of negative electrode sheet 512 and two layers of separator 513. The single positive electrode sheet 511, the first separator 5131, the single negative electrode sheet 512 and the second separator 5132 are stacked in sequence inside the heating device 7. The first separator 5131 and the second separator 5132 are configured as glue-coated separators. After being heated by the heating device 7, the glue-coated separators are sticky. The baked single positive electrode sheet 511 and the single negative electrode sheet 512 are thermally composited with the first separator 5131 and the second separator 5132 to form a combination. The combination is rolled and compacted by the hot rolling device 8 to form the thermal composite electrode unit 51. Two adjacent thermal composite electrode units 51 are connected by the blank area 52.

[0052] Multiple continuous thermal composite electrode units 51 are stacked by the lamination device 1 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 in 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.

[0053] Referring to Figures 2 to 7, in some embodiments provided in the present application, by improving the structure of the drive roller assembly in the stacking device 1, the drive roller assembly can effectively control the stacking process of the thermal composite electrode assembly 5, so that the thermal composite electrode unit 51 is prepared through the stacking device 1 according to the established stacking route and stacking speed to form a battery core pack with a higher degree of alignment.

[0054] Specifically, the lamination device 1 includes a lamination table 11 and a driving mechanism 30 .

[0055] The stacking platform 11 is configured to stack a plurality of electrode units to form a battery core. The stacking platform 11 is located below the driving mechanism 30 .

[0056] The driving mechanism 30 includes a first driving roller assembly 31 and a second driving roller assembly 32. The first driving roller assembly 31 and the second driving roller assembly 32 are arranged at intervals on the same side of the lamination table 11. The first driving roller assembly 31 and the second driving roller assembly 32 are configured to simultaneously drive the thermal composite pole piece assembly 5 to move, and the first driving roller assembly 31 and the second driving roller assembly 32 are both configured to be able to clamp the pole piece unit.

[0057] A first interval is set between the first driving roller assembly 31 and the second driving roller assembly 32. 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.

[0058] In a specific implementation, the ratio of d1 to 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, or any range therebetween, which are not listed in this application.

[0059] In an embodiment of the present application, the stacking process of the thermal composite pole piece assembly 5 is simultaneously controlled by using the first drive roller assembly 31 and the second drive roller assembly 32, wherein the first drive roller assembly 31 and the second drive roller assembly 32 are both configured to clamp the thermal composite pole piece unit 51, and the first interval d1 between the first drive roller assembly 31 and the second drive roller assembly 32 is controlled 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 31 and the second drive roller assembly 32, the thermal composite pole piece unit 51 is in the other of the second drive roller assembly 32 and the second drive roller assembly 32, so that at least one of the first drive roller assembly 31 and the second drive roller assembly 32 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.

[0060] In a specific implementation, when the gap between the first drive roller assembly 31 and the stacking device 1 is small, the first gap d1 is 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 31, the pole piece thermal composite unit adjacent to the blank area 52 is in the second gap of the second drive roller assembly 32, so that the second drive roller assembly 32 can provide a stable clamping force to the thermal composite pole piece unit 51. If the first gap 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 31, the next blank area 52 set adjacent to the blank area 52 is in the second drive roller assembly 32, which will cause the second drive roller assembly 32 to be unable to provide a stable clamping force to the thermal composite pole piece assembly 5, thereby causing the stacking process of the thermal composite pole piece assembly 5 to be out of control.

[0061] When the interval between the first drive roller assembly 31 and the lamination table 11 is large, the first interval d1 is set to be greater 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 31, the thermal composite pole piece unit 51 should be in the second interval of the second drive roller assembly 32, so that the second drive roller assembly 32 can provide a stable clamping force on the thermal composite pole piece unit 51.

[0062] Compared to the related art, in which the spacing between the drive roller assemblies is set to be adjustable, in order to increase the thermal recombination speed of the electrode unit, the stacking speed of the thermal composite electrode assembly 5 is relatively fast. Therefore, the spacing between the drive roller assemblies cannot be adjusted instantaneously. At the same time, it is also necessary to accurately adjust it in combination with the specific stacking position of the thermal composite electrode assembly 5. The stacking control process of the entire thermal composite electrode assembly 5 is also difficult to achieve accuracy and efficiency. In the implementation of the present application, by providing two drive roller assemblies on the moving path of the thermal composite electrode assembly 5, while maintaining the high-speed stacking of the thermal composite electrode assembly 5, it is also possible to improve the blank area 52 that cannot be clamped by a single drive roller assembly, resulting in a loss of control of the stacking process.

[0063] Continuing with reference to Figures 4 to 11 , the first drive roller assembly 31 includes a first drive roller 311 and a second drive roller 312 disposed opposite each other, with a second gap d2 formed between the first drive roller 311 and the second drive roller 312. The second drive roller assembly 32 is located between the first drive roller assembly 31 and the lamination table 11 and includes a third drive roller 321 and a fourth drive roller 322 disposed opposite each other, with a third gap d3 formed between the third drive roller 321 and the fourth drive roller 322. The first drive roller assembly 31 and the second drive roller assembly 32 are configured to simultaneously drive the thermal composite pole piece assembly 5 to move, with the second gap d2 and the third gap d3 both being configured to be no less than the thickness of the pole piece unit 51, and / or, the second gap d2 and the third gap d3 both being configured to be no less than 118 μm, and the second gap d2 and the third gap d3 both being configured to be no greater than 460 μm.

[0064] 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 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 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 31 and the second drive roller assembly 32 can both provide sufficient clamping force to the thermal composite electrode unit 51.

[0065] If the second spacing d2 or the third spacing d3 is outside the above range, the first drive roller assembly 31 and the second drive roller assembly 32 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 spacing d2 or the third spacing d3 is less than 118μm, the spacing between the first drive roller assembly 31 and the second drive roller assembly 32 is too small, making it difficult for the thermal composite pole piece unit 51 to pass through the second spacing d2 or the third spacing d3, resulting in the first drive roller assembly 31 and the second drive roller assembly 32 being unable to effectively drive the thermal composite pole piece unit 51. When the second spacing d2 or the third spacing d3 is greater than 460μm, the spacing between the first drive roller assembly 31 and the second drive roller assembly 32 is too large, resulting in the first drive roller assembly 31 and the second drive roller assembly 32 being unable to provide an effective clamping force on the thermal composite pole piece unit 51.

[0066] In a specific implementation, the second interval d2 and the third interval d3 can be adjusted according to the thickness 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 31 and the third interval d3 of the second drive roller assembly 32 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 31 and the third interval d3 of the second drive roller assembly 32 are adjusted to 300 μm.

[0067] The second and third intervals d2 and d3 are configured to be identical, allowing the thermal composite pole piece assembly 5 to pass through the first and second drive roller assemblies 31 and 32 at the same speed, thereby maintaining the stability of the stacking process of the thermal composite pole piece assembly 5. For example, when the third interval d3 is smaller than the second interval d2, the resistance encountered by the thermal composite pole piece assembly 5 when passing through the second drive roller assembly 32 is smaller than the resistance encountered when passing through the first drive roller assembly 31. Alternatively, when the third interval d3 is significantly larger than the second interval d2, after the thermal composite pole piece assembly 5 passes through the first drive roller assembly 31 in a straight line, it then enters the third interval d3 of the second drive roller assembly 32. Since the third interval d3 is significantly larger than the second interval d2, the thermal composite pole piece assembly 51 may be positionally offset within the excessively large interval, thereby affecting the stability of the stacking process.

[0068] It should be noted that the sameness between the 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.

[0069] The lamination device 1 also includes a roller drive 33, which is configured to drive the first drive roller assembly 31 and / or the second drive roller assembly 32; the first drive roller 311 and the third drive roller 321 are configured as active rollers, and the second drive roller 312 and the fourth drive roller 322 are configured as driven rollers. The roller drive 33 is configured to be connected only to the active rollers, and the outer surface of the active roller is configured to be a soft and rough surface, and the outer surface of the driven roller is configured to be a hard and smooth surface.

[0070] The roller drive 33 can be set as one or more of an electric roller drive, a hydraulic roller drive, a friction roller drive and a gear roller drive, wherein the first drive roller assembly 31 and the second drive roller assembly 32 can be configured to share a drive device, or the first drive roller assembly 31 and the second drive roller assembly 32 can be configured with a drive device respectively.

[0071] One of the first drive roller 311 and the second drive roller 312 is set as an active roller, and the other of the first drive roller 311 and the second drive roller 312 is set as a driven roller. One of the third drive roller 321 and the fourth drive roller 322 is set as an active roller, and the other of the third drive roller 321 and the fourth drive roller 322 is set as a driven roller.

[0072] The active roller is configured to be connected to the driving device, and the driven roller is connected to the active roller through a transmission device. The transmission device includes a chain, gears, and belts, etc. The rotation speed and rotation direction of the driven roller are controlled by the active roller, so that the first drive roller assembly 31 and the second drive roller assembly 32 can operate stably.

[0073] By controlling the opening and closing of the driving device, the opening and closing of the first driving roller assembly 31 and the second driving roller assembly 32 are controlled, and by controlling the power or speed of the driving device, the rotation speed of the second driving roller assembly 32 and the second driving roller assembly 32 are controlled.

[0074] 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 31 and the second drive roller assembly 32 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 independently adjusted in a small range, thereby preventing the first drive roller assembly 31 and the second drive roller assembly 32 from crushing the surface of the thermal composite pole piece unit 51.

[0075] 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 gap defined between the active roller and the driven roller can be adjusted autonomously. When the second gap d2 and the third gap d3 defined between the active roller and the driven roller are satisfied and can provide a stable clamping effect on the thermal composite pole piece unit 51, the gap can be adjusted autonomously 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 330 μm±5 μm, the second gap d2 of the first drive roller assembly 31 and the third gap d3 of the second drive roller assembly 32 are set to 330 μm, when the thickness of the thermal composite pole piece unit 51 passing through the first drive roller assembly 31 is 335 μm, if the gap defined by the active roller and the driven roller cannot be adjusted autonomously, 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 gap d2 and the third gap d3, thereby causing damage to the outer surface of the thermal composite pole piece unit 51.

[0076] 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.

[0077] In some embodiments, the rotational speed of the first drive roller assembly 31 is set to 1rpm / nim ~40 rpm / nim, and the first drive roller assembly 31 can be set to drive the thermal composite 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 32 is set to 1rpm / nim~40rpm / nim, and the first drive roller assembly 31 can be set to drive the thermal composite 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 31 and the rotational speed of the second drive roller assembly 32 are configured to be the same.

[0078] In a specific implementation, the first drive roller 311 and the second drive roller 312 are set as cylindrical rollers, the third drive roller 321 and the fourth drive roller 322 are set as cylindrical rollers, the outer radius of the first drive roller 311, the second drive roller 312, the third drive roller 321 and the fourth drive roller 322 are all set to 40 mm, and the first drive roller 311, the second drive roller 312, the third drive roller 321 and the fourth drive roller 322 are set to have the same rotation speed. Taking the first drive roller 311 and the first drive roller assembly 31 as an example, the rotation speed of the first drive roller assembly 31 is set to 1 rpm / nim ~40rpm / nim, the first drive roller assembly 31 can be set to drive the thermal composite 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 drive roller assembly 31, the faster the first drive roller assembly 31 can be set to move the thermal composite pole piece assembly 5 to be driven. Therefore, the rotation speed of the first drive roller assembly 31 can be set to any value between 1rpm / nim ~40rpm / nim according to the moving speed of the thermal composite pole piece assembly 5 to be driven. Specifically, the rotational speed of the first drive roller assembly 31 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 values ​​or a rotational speed range between any two values. Correspondingly, the first drive roller assembly 31 can be set to drive the moving speed of the thermal composite pole piece assembly 5 to be 10m / min, 20m / min, 30m / min, 40m / min, 50m / min, 60m / min, 70m / min, 80m / min, 90m / min and a moving speed value between any two values ​​or a moving speed range between any two values.

[0079] Continuing to refer to Figures 4 to 6, the lamination device 1 also includes a first support platform 314 and a second support platform 324 arranged at intervals, the first support platform 314 is configured to fix the first drive roller assembly 31, and the second support platform 324 is configured to fix the second drive roller assembly 32, the first drive roller assembly 31 is configured to be able to move on the first support platform 314, and / or, the second drive roller assembly 32 is configured to be able to move on the second support platform 324.

[0080] By configuring the first drive roller assembly 31 to be movable to the left and to the right on the first support platform 314, and configuring the second drive roller assembly 32 to be movable to the left and to the right on the second support platform 324, the thermal composite pole piece unit 51 can be configured as a Z-shaped stack. Specifically, by controlling the first drive roller assembly 31 on the first support platform 314 and the second drive roller assembly 32 on the second support platform 324 to move to the left or to the right at the same speed, the first drive roller assembly 31 and the second drive roller assembly 32 simultaneously control the thermal composite 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 11 in a Z-shaped reciprocating stacking manner.

[0081] In a specific implementation, a first slide rail for the first driving roller assembly 31 to move leftward or rightward is provided on the first support platform 314 , and a slide rail for the second driving roller assembly 32 to move leftward or rightward is provided on the second support platform 324 .

[0082] Continuing to refer to Figures 4 to 6, the lamination device 1 also includes a first support frame 313 and a second support frame 323 arranged at intervals, the first drive roller assembly 31 is accommodated inside the first support frame 313, and the second drive roller assembly 32 is accommodated inside the second support frame 323. The first support frame 313 and the second support frame 323 are placed in parallel, and the first support frame 313 is configured to be approximately perpendicular to the first support platform 314, and the second support frame 323 is configured to be approximately perpendicular to the second support platform 324.

[0083] A first slide groove is provided at the bottom of the first support frame 313, and the first slide groove is configured to slide to the left or right in the first slide rail. A second slide groove is provided at the bottom of the second support frame 323, and the second slide groove is configured to slide to the left or right in the second slide rail.

[0084] Continuing to refer to Figures 4 to 6, the lamination device 1 also includes a plurality of limit members 12 arranged on the lamination table 11, and the plurality of limit members 12 are configured to limit the position of the thermal composite pole piece assembly 5, wherein the position of at least a portion of the plurality of limit members 12 is configured to be adjustable.

[0085] In a specific implementation, multiple stoppers 12 can be respectively arranged on the left side, right side, front side, and rear side of the lamination table 11. The area enclosed by the multiple stoppers 12 defines the stacking area of ​​the thermal composite electrode sheets. The stacking area is defined as the position and size of the area where the thermal composite electrode sheet units 51 are laid flat on the lamination table 11. By adjusting the position of at least a portion of the stoppers 12 arranged on the left side, right side, front side, and rear side of the lamination table 11, the size of the stacking area of ​​the thermal composite electrode sheets can be adjusted. For example, the size of the thermal composite electrode sheet units 51 can be controlled according to the size of the battery core pack to be prepared. By adjusting the position of at least a portion of the stoppers 12 on the lamination table 11, the position of the stacking area on the lamination table 11 can be adjusted.

[0086] The first support frame 313 , the second support frame 323 and the laminating platform 11 are sequentially arranged in parallel, and the laminating platform 11 is configured to be movable toward or away from the second support frame 323 .

[0087] When the stack size of the thermal composite electrode unit 51 is large, the stacking platform 11 can be set to move away from the second support frame 323, so that sufficient spacing is provided between the second support frame 323 and the stacking platform 11 to facilitate the thermal composite electrode unit 51 to be stacked on the stacking platform 11 in a Z-shaped folded manner. When the stack size of the thermal composite electrode unit 51 is small, the stacking platform 11 can be set to move closer to the second support frame 323, thereby reducing the spacing between the second support frame 323 and the stacking platform 11. This allows the thermal composite electrode unit 51 to be stacked on the stacking platform 11 in a shorter path, thereby improving stacking efficiency.

[0088] As shown in Figures 4 to 6, the lamination device 1 also includes at least two monitors 9 arranged at intervals, which are configured to monitor the thermal composite electrode assembly 5. At least two monitors 9 are arranged between the second support platform 324 and the lamination platform 11. At least one of the two monitors 9 is located on one side of the second drive roller assembly 32, and at least another of the two monitors 9 is located on the other side of the second drive roller assembly 32.

[0089] By setting two monitors 9 between the second drive roller assembly 32 and the lamination table 11, the two monitors 9 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, thereby improving the alignment of the battery core pack prepared by the lamination device 1.

[0090] The present application also provides a method for processing a thermal composite electrode assembly 5, the processing method comprising:

[0091] 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 thermally composited electrode sheet unit 51;

[0092] The first drive roller assembly 31 and the second drive roller assembly 32 are driven. The first drive roller assembly 31 and the second drive roller assembly 32 simultaneously drive the thermal composite electrode assembly 5 to move toward the lamination table 11. The thermal composite electrode unit 51 passes through the first drive roller assembly 31 and the second drive roller assembly 32 in sequence.

[0093] The lamination device 1 stacks a plurality of thermal composite electrode units 51 to form a battery core pack.

[0094] By using the first drive roller assembly 31 and the second drive roller assembly 32 to simultaneously drive and control the folding process of the thermal composite pole piece assembly 5, it is possible to effectively avoid the situation where a single drive roller assembly is unable to provide effective clamping effect on the blank area 52 in the thermal composite pole piece assembly 5, thereby causing the folding process of the thermal composite pole piece assembly 5 to get out of control.

[0095] The processing method of the thermal composite pole piece assembly 5 also includes:

[0096] The position of the first driving roller assembly 31 on the first support platform 314 and / or the position of the second driving roller assembly 32 on the second support platform 324 are adjusted to adjust the position of the thermal composite pole piece unit 51 relative to the lamination platform 11 .

[0097] For example, by synchronously adjusting the position of the first drive roller assembly 31 on the first support platform 314 and the position of the second drive roller assembly 32 on the second support platform 324, the first drive roller assembly 31 and the second drive roller assembly 32 can drive the thermal composite pole piece assembly 5 to be stacked on the lamination table 11 in a Z-shaped lamination manner.

[0098] Example 2

[0099] At present, in the lithium battery industry, in order to ensure the stacking efficiency of the electrode units, a stacking device is usually used to stack the electrode units. However, in related technologies, when the stacking device folds the electrode units, since the electrode units are in a free-falling state during the stacking process, the overall alignment of the multiple electrode units after stacking cannot be guaranteed by relying solely on the shaping cylinder to shape the electrode, thereby affecting the performance of the electrode units and the overall alignment of the multiple electrode units.

[0100] As shown in Figures 12 and 13, an embodiment of the present application provides a pole piece stacking device, which includes: a driving mechanism 30, which is configured to drive a plurality of thermal composite pole piece units 51 to move, and the connection between two adjacent thermal composite pole piece units 51 has a crease; a receiving assembly 10, which is arranged below the driving mechanism 30 in the vertical direction, and the receiving assembly 10 includes a stacking platform 11 and a limiting member 12, and a plurality of thermal composite pole piece units 51 are bent through the crease and stacked on the stacking platform 11, and the limiting member 12 is arranged at the edge of the stacking platform 11 along the circumference of the stacking platform 11, and the limiting member 12 is configured to limit the position of the thermal composite pole piece unit 51 in the horizontal direction; wherein the stacking platform 11 can vibrate in the horizontal direction so that the edges of the plurality of thermal composite pole piece units 51 abut against the limiting member 12 and are aligned.

[0101] By applying the technical solution of the present application, the receiving component 10 is set to be vibratory in the horizontal direction, and a limiting member 12 is arranged around the lamination table 11. In this way, during the operation of the device, the receiving component 10 can use vibration to make the thermal composite pole piece unit 51 contact with the limiting member 12, so that the limiting member 12 can be used to align the edges of the thermal composite pole piece unit 51, thereby ensuring the alignment of multiple thermal composite pole piece units 51.

[0102] Here, X is the length direction of the side plate 110 .

[0103] In the present application, the limiting member 12 is specifically a baffle, which is arranged to protrude from the end face of the stacking table 11 in the vertical direction, so that the multiple stacked thermal composite electrode units 51 can be limited, thereby improving the overall alignment of the multiple thermal composite electrode units 51.

[0104] Specifically, the receiving assembly 10 also includes a stacking stage driver 13, which is vertically arranged below the stacking stage 11. The driving end of the stacking stage driver 13 is connected to the stacking stage 11 to drive the stacking stage 11 to vibrate. In the embodiment of the present application, the stacking stage driver 13 is specifically a driving motor, which has a small structure and is easy to install. This not only meets the driving requirements of the device, but also improves the efficiency of the device's assembly and disassembly, making it easier for users to maintain and disassemble the stacking stage driver 13. In addition, the stacking stage driver 13 in the present application has a cam structure inside, which enables the stacking stage 11 to move in an elliptical trajectory in the horizontal direction, thereby enabling the limiter 12 to come into contact with the four sides of the thermal composite pole piece unit 51, thereby improving the device's correction effect on the alignment of the thermal composite pole piece unit 51.

[0105] Optionally, the stacking table 11 can also be set to move along a circle or a straight line, as long as it can meet the use requirements of the device. The specific selection should be made according to the use environment of the device, which can improve the applicability and scope of application of the device.

[0106] The electrode stacking device also includes a stacking platform position adjustment member 14, which includes a first mounting portion 141 and a first adjustment portion 142. The first adjustment portion 142 is movably mounted on the first mounting portion 141. The first adjustment portion 142 is fixedly connected to the stacking platform driver 13 and can move the stacking platform driver 13 in a first direction. This structure allows for timely position adjustment during the stacking process of the thermal composite electrode unit 51, thereby enabling the stacking platform 11 to be adjusted according to different fold positions, thereby improving the stacking efficiency of the device.

[0107] Specifically, the electrode stacking device further includes a drive roller position adjustment member 35 having a second mounting portion 351 and a second adjustment portion 352. The second adjustment portion 352 is movably mounted on the second mounting portion 351. The second adjustment portion 352 is fixedly connected to the drive mechanism 30 and can move along the first direction with the drive mechanism 30. This structure allows for timely position adjustment during the stacking process of the thermal composite electrode unit 51, thereby enabling the drive mechanism 30 to adjust according to different fold positions, thereby cooperating with the stacking position adjustment member 14 to improve the stacking efficiency of the device.

[0108] In this application, the stacking position adjustment member 14 and the driving roller position adjustment member 35 are both motor-driven screw-nut pairs or gear rack pairs, which not only meets the driving requirements of the device, but also reduces the production cost of the device, thereby enabling mass production of the device.

[0109] The drive mechanism 30 includes a first drive roller 311 and a second drive roller 312, which are spaced apart along a first direction. The thermal composite electrode unit 51 is disposed in the gap between the first drive roller 311 and the second drive roller 312. The first drive roller 311 and the second drive roller 312 rotate to drive the thermal composite electrode unit 51 to move. This not only provides power to the thermal composite electrode unit 51 but also guides its movement, thereby improving its movement efficiency and ensuring that it does not deviate during movement, thereby improving its stability when folded.

[0110] The first drive roller 311 and the second drive roller 312 rotate in opposite directions. This arrangement allows the first drive roller 311 and the second drive roller 312 to apply tension to the surface of the thermal composite electrode unit 51, thereby balancing the tension in all directions of the thermal composite electrode unit 51. This prevents the surface of the thermal composite electrode unit 51 from being uneven, thereby preventing wrinkles from forming on the surface of the thermal composite electrode unit 51.

[0111] The drive mechanism 30 also includes a roller drive member 33. The drive end of the roller drive member 33 is drivingly connected to one of the first drive roller 311 and the second drive roller 312. The first drive roller 311 and the second drive roller 312 are in driving connection with each other so as to rotate simultaneously. In the present application, the roller drive member 33 is specifically a drive motor. This structure is relatively small and easy to install. This not only meets the driving requirements of the device, but also improves the efficiency of the device's assembly and disassembly, thereby facilitating maintenance and disassembly of the roller drive member 33 by the user.

[0112] Specifically, the electrode stacking device also includes a monitor 9. The monitor 9 of this embodiment is a visual camera. The monitor 9 is arranged in the vertical direction between the drive mechanism 30 and the receiving assembly 10. The monitor 9 is configured to monitor the position of the thermal composite electrode unit 51, and the monitor 9 is respectively connected to the stacking position adjustment member 14 and the drive roller position adjustment member 35. The stacking position adjustment member 14 and the drive roller position adjustment member 35 can receive signals from the monitor 9 to adjust the position of the thermal composite electrode unit 51. With this arrangement, when the position of the thermal composite electrode unit 51 deviates, the stacking position adjustment member 14 and the drive roller position adjustment member 35 are used to timely adjust the position of the thermal composite electrode unit 51, so that the production line can be corrected when the thermal composite electrode unit 51 is blanked, so as to improve the alignment of the thermal composite electrode unit 51 after lamination.

[0113] There are two monitors 9, which are arranged horizontally on both sides of the thermal composite electrode unit 51. By setting up the above structure, the monitoring accuracy of the monitors 9 can be improved, thereby improving the alignment of the thermal composite electrode unit 51 after lamination.

[0114] Specifically, the pole piece stacking device further includes a side plate 110, to which the stacking platform position adjustment member 14 and the drive roller position adjustment member 35 are fixed. This arrangement improves the overall integration of the device, facilitates the disassembly and maintenance of each component, and thus improves the efficiency of disassembly and maintenance of the device.

[0115] By applying the technical solution of the present application, the receiving component 10 is set to vibrate in the horizontal direction, and a limiter 12 is arranged around the stacking table 11. In this way, during the operation of the device, the receiving component 10 can use vibration to make the thermal composite pole piece unit 51 contact with the limiter 12, so that the limiter 12 can be used to align the edges of the thermal composite pole piece unit 51, thereby ensuring the alignment of multiple thermal composite pole piece units 51 and also helping to improve the stacking efficiency of the device.

[0116] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0117] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to actual proportional relationships. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be discussed in subsequent figures. In the description of this application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of this application; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0118] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0119] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0120] Example 3

[0121] The electrode assembly in the battery cell is usually formed by stacking the positive electrode, the diaphragm and the negative electrode through a thermal composite lamination process. The thermal composite electrode assembly includes multiple connected thermal composite electrode units. Two adjacent thermal composite electrode units are connected by a blank section. The blank section usually includes two layers of diaphragms. Each thermal composite electrode unit includes a negative electrode, a first diaphragm, a positive electrode and a second diaphragm stacked in sequence.

[0122] As shown in Figures 14 and 15, the process flow of thermal composite lamination in the battery should include:

[0123] Provide negative electrode sheets, separators and positive electrode sheets;

[0124] A layer of negative electrode sheet, two layers of separators and a layer of positive electrode sheet are formed into a thermal composite electrode sheet unit through a thermal composite rolling process, two adjacent thermal composite electrode sheet units are connected by a blank section, and multiple connected thermal composite electrode sheet units form a thermal composite electrode sheet assembly;

[0125] Perform CCD (photon detector) detection on the thermal composite pole piece unit to detect the alignment of the positive pole piece and the negative pole piece in each thermal composite pole piece unit;

[0126] Stacking multiple thermal composite electrode units through a lamination device to form an electrode assembly in a battery cell;

[0127] The electrode components in two adjacent battery cells are cut into blank sections;

[0128] The electrode assembly in the battery cell is hot pressed to form a battery cell core package.

[0129] Among them, the negative electrode sheet is continuously unwound onto the operating table in the form of a roll of negative electrode sheet, and is cut and dust-removed on the operating table to form negative electrode sheets of a certain specification. The diaphragm is continuously unwound onto the operating table in the form of a roll of diaphragm, and is positionally corrected and static-free on the operating table. The diaphragm unwinding is located after the negative electrode unwinding. The positive electrode sheet is continuously unwound onto the operating table in the form of a roll of positive electrode sheet, and is cut and dust-removed on the operating table to form positive electrode sheets of a certain specification. The positive electrode sheet unwinding is located after the diaphragm unwinding. The blank section in the thermal composite electrode unit includes two layers of diaphragm.

[0130] As shown in FIG16 , during the lamination process, the thermal composite electrode sheet assembly 5 is driven by a drive mechanism comprising a first drive roller 311 and a second drive roller 312. The thermal composite electrode sheet assembly 5 is clamped between the first drive roller 311 and the second drive roller 312. While being delivered to the lamination table by the drive mechanism, the thermal composite electrode sheet assembly 5 is in a free-fall state, as indicated by arrow Y in FIG16 . Because the thermal composite electrode sheet assembly 5 is in a free-fall state during the lamination process, the thermal composite electrode sheet assembly 5 is shaped solely by the shaping cylinders 101 disposed on both sides of the lamination table. This results in poor overall alignment of the electrode sheet assembly within a single cell, achieving only ±1.0 mm. Furthermore, the thermal composite lamination process in the related art is only suitable for thermal composite electrode sheet assemblies with a electrode sheet width of no greater than 150 mm. When the electrode sheet width exceeds 340 mm, the electrode sheet assembly will arch upward during the lamination process, further worsening the overall alignment of the electrode sheet assembly within the resulting single cell, making it unsuitable for industrial application.

[0131] During the process of shaping the hot composite pole piece assembly 5, the shaping cylinders 101 arranged on both sides of the stacking table 11 mainly beat the hot composite pole piece assembly 5, which may cause the active material on the positive pole piece or the negative pole piece to fall off due to the beating, thereby causing the risk of internal short circuit of the battery cell.

[0132] The spacing of the blank section between two adjacent thermal composite electrode units 51 is 1±0.3mm. The accuracy of the blank section itself is poor, which results in the crease between two adjacent battery cells not being set in the middle of the blank section during the Z-shaped folding of the thermal composite electrode assembly 5.

[0133] In view of the fact that the overall alignment of the electrode assembly in the battery cell prepared by the thermal composite lamination process in the related technology is poor and can only be set to a thermal composite electrode assembly with a width of no more than 150mmd of the thermal composite electrode unit, the embodiments of the present application improve the structure of the lamination device.

[0134] 17 to 19 , the present application provides a lamination device 1 , which includes a lamination table 11 and at least one pressing mechanism 20 .

[0135] The stacking platform 11 is configured to stack the thermal composite electrode assemblies 5. A limiter 12 is provided on each side of the stacking platform 11. The limiters 12 define a stacking area for the thermal composite electrode assemblies 5. The limiters 12 are adjustable. By adjusting the position of the limiters 12, the size of the area on the stacking platform 11 where the thermal composite electrode assemblies 5 can be stacked is adjusted.

[0136] The pressing mechanism 20 includes a first pressing mechanism 21 disposed on the first side 151 of the lamination table 11. The first pressing mechanism 21 includes a first pressing device 211 and a second pressing device 212. The spacing between the first pressing device 211 and the second pressing device 212 is equal to the width w of the thermal composite electrode unit 51, so that the first pressing device 211 presses on one side 510 of the thermal composite electrode unit 51, and the second pressing device 212 presses on the other side 520 of the thermal composite electrode unit 51. The spacing between the one side 510 of the thermal composite electrode unit 51 and the other side 520 of the thermal composite electrode assembly is set to the width w of the thermal composite electrode unit 51.

[0137] By using a pressing mechanism to replace the shaping cylinder in the related art, during the stacking process of the thermal composite pole piece assembly 5, the first pressing device 211 and the second pressing device 212 respectively press the two sides of the width direction of the thermal composite pole piece assembly 5, so that there is pressing tension in the process of the thermal composite pole piece assembly 5 moving from the driving mechanism to the stacking table 11, which helps to improve the overall alignment of the pole piece assembly of the battery cell.

[0138] Through research, the inventors found that the alignment of the electrode assembly in the battery cell formed by stacking the thermal composite electrode units using the lamination device in the related technology can only reach ±1.0mm, while the alignment of the electrode assembly in the battery cell formed by stacking the thermal composite electrode units using the lamination device 1 provided in the present application can be improved to ±0.05mm. The alignment accuracy improvement rate of the electrode assembly of the battery cell reaches 100%, which is crucial for improving the performance of the battery cell.

[0139] The interval d between the first pressing device 211 and the second pressing device 212 is set to 100 mm to 600 mm. The interval d between the first pressing device 211 and the second pressing device 212 can be set to 100 mm, 150 mm, 200 mm, 250 mm, 300 mm, 350 mm, 400 mm, 450 mm, 500 mm, 600 mm, or any value between any two of the above values, or a range between any two of the above values.

[0140] The distance d between the first pressing device 211 and the second pressing device 212 is mainly adjusted according to the width of the thermal composite electrode unit 51. When the width of the thermal composite electrode unit 51 is set to 150 mm, the distance d between the first pressing device 211 and the second pressing device 212 is correspondingly set to 150 mm. When the width of the thermal composite electrode unit 51 is set to 340 mm, the distance d between the first pressing device 211 and the second pressing device 212 is correspondingly set to 340 mm.

[0141] In some embodiments, the spacing between the first pressing device 211 and the second pressing device 212 is adjustable, that is, the first pressing mechanism 21 further includes an adjusting member, which adjusts the spacing between the first pressing device 211 and the second pressing device 212 according to the width of the thermal composite electrode assembly 5, so that the lamination device can be compatible with the lamination requirements of thermal composite electrode assemblies 5 of different sizes. This application does not exclude that in the same lamination device, the spacing between the first pressing device 211 and the second pressing device 212 is set to a certain value, and in different lamination devices, the spacing between the first pressing device 211 and the second pressing device 212 is set to different values.

[0142] Since the thermal composite electrode assembly 5 is pressed by the first pressing device 211 and the second pressing device 212 on both sides during the movement of the self-driving mechanism 30 to the lamination table 11, even when the width w of the thermal composite electrode unit 51 is large, for example, when the width w of the thermal composite electrode unit 51 is greater than 340 mm, the thermal composite electrode assembly 5 is in a tensioned state, thereby effectively improving the upward micro-arch structure formed by the thermal composite electrode assembly 5 during the stacking process, so that the wide thermal composite electrode assembly 5 can maintain a high degree of alignment when stacked using the lamination device 1 provided in the embodiment of the present application. The inventors found through research that the alignment of the electrode assemblies in the battery cell formed by stacking the wide thermal composite electrode assembly 5 using the lamination device provided in the embodiment of the present application can still be maintained at ±1.0 mm, thereby significantly improving the width range of the thermal composite electrode assembly 5 that the lamination device 1 can be compatible with.

[0143] Continuing with reference to Figures 17 to 19, the pressing mechanism 20 further includes a second pressing mechanism 22 disposed opposite the first pressing mechanism 21. The second pressing mechanism 22 includes a third pressing device 221 and a fourth pressing device 222. The spacing d between the third pressing device 221 and the fourth pressing device 222 is also equal to the width of the thermal composite electrode unit 51. The first pressing mechanism 21 is disposed on the first side 151 of the lamination platform 11, and the second pressing mechanism 22 is disposed on the second side 152 of the lamination platform 11. When the thermal composite electrode unit 51 is located on the first side 151 of the lamination platform 11, the first pressing mechanism 21 provides a constant pressing tension to the thermal composite electrode unit 51. When the thermal composite electrode unit 51 is located on the second side 152 of the lamination platform 11, the second pressing mechanism 22 provides a constant pressing tension to the thermal composite electrode unit 51, thereby facilitating Z-shaped stacking of the thermal composite electrode assembly 5 on the lamination platform 11.

[0144] Among them, the first pressing mechanism 21 and the second pressing mechanism 22 have the same structure and are arranged completely symmetrically. As shown in Figure 18, the first pressing device 211 and the third pressing device 221 are arranged opposite each other, and the second pressing device 212 and the fourth pressing device 222 are arranged opposite each other.

[0145] Continuing to refer to Figures 17 to 19, the first pressing device 211, the second pressing device 212, the third pressing device 221 and the fourth pressing device 222 all include a driving member and a pressing member, the pressing member includes a connecting portion connected to the driving member and a pressing portion bent and connected to the connecting portion, the driving member 23 is configured to drive the pressing portion to move toward or away from the lamination table 11, the pressing portion is configured to press the electrode thermal composite, i.e., the electrode unit 51, and the extension direction of the pressing portion is configured to be the same as the width direction of the thermal composite electrode unit 51.

[0146] As shown in Figures 17 and 19, the first pressing device 211 includes a first driving member 231 and a first pressing member 241. The first pressing member 241 includes a first connecting portion 251 and a first pressing portion 261 bent and connected to the first connecting portion 251. The second pressing device 212 includes a second driving member 232 and a second pressing member 242. The second pressing member 242 includes a second connecting portion 252 and a second pressing portion 262 bent and connected to the second connecting portion 252. The first pressing portion 261 and the second pressing portion 262 both extend along the width direction of the thermal composite electrode assembly 5, and the extension direction of the first pressing portion 261 and the extension direction of the second pressing portion 262 are opposite. When the thermal composite electrode assembly 5 is located on the first side 151 of the lamination table 11, the first pressing portion 261 presses on one side 510 of the thermal composite electrode assembly, and the second pressing portion 262 presses on the other side 520 of the thermal composite electrode unit 51.

[0147] When the thermal composite electrode assembly 5 is located on the first side 151 of the lamination table 11, the first pressing portion 261 and the second pressing portion 262 are arranged opposite each other. The first pressing portion 261 and the second pressing portion 262 simultaneously press on the thermal composite electrode assembly 5. The sum of the contact areas of the first pressing portion 261 and the second pressing portion 262 with the thermal composite electrode assembly 5 is configured as the contact area between the first pressing mechanism 21 and the thermal composite electrode assembly 5. The first connecting portion 251 and the second connecting portion 252 are configured to not contact the thermal composite electrode assembly 5. The first pressing portion 261 and the second pressing portion 262 are both configured to extend along the width direction of the thermal composite electrode assembly 5, so that the first pressing device 211 and the second pressing device 212 can provide a compressive force along the width direction of the thermal composite electrode assembly 5. This compressive force is perpendicular to the stacking direction of the thermal composite electrode assembly 5, so that the thermal composite electrode assembly 5 can be as closely attached to the lamination table 11 as possible.

[0148] As shown in Figures 17 and 20, the third pressing device 221 includes a third driving member 233 and a third pressing member 243. The third pressing member 243 includes a third connecting portion 253 and a third pressing portion 263 bent and connected to the third connecting portion 253. The fourth pressing device 222 includes a fourth driving member 234 and a fourth pressing member 244. The fourth pressing member 244 includes a fourth connecting portion 254 and a fourth pressing portion 264 bent and connected to the fourth connecting portion 254. The third pressing portion 263 and the fourth pressing portion 264 both extend along the width of the thermal composite electrode assembly 5, and the extension direction of the third pressing portion 263 is opposite to the extension direction of the fourth pressing portion 264. When the thermal composite electrode assembly 5 is located on the second side of the lamination table 11, the third pressing portion 263 presses on one side of the thermal composite electrode assembly 5, and the fourth pressing portion 264 presses on the other side of the thermal composite electrode assembly 5.

[0149] When the thermal composite electrode assembly 5 is located on the second side of the lamination table 11, the third pressing portion 263 and the fourth pressing portion 264 are arranged opposite each other, so that the third pressing portion 263 and the fourth pressing portion 264 simultaneously press on the thermal composite electrode assembly 5. The sum of the contact areas between the third pressing portion 263 and the fourth pressing portion 264 and the thermal composite electrode assembly 5 is configured to be the contact area between the first pressing mechanism 21 and the thermal composite electrode assembly 5. The third connecting portion 253 and the fourth connecting portion 254 are configured to not contact the thermal composite electrode assembly 5. The third pressing portion 263 and the fourth pressing portion 264 are both arranged to extend along the width direction of the thermal composite electrode assembly 5, so that the third pressing device 221 and the fourth pressing device 222 can provide a compressive force along the width direction of the thermal composite electrode assembly 5. This compressive force is perpendicular to the stacking direction of the thermal composite electrode assembly 5, so that the thermal composite electrode assembly 5 can be as closely attached to the lamination table 11 as possible.

[0150] Continuing with FIG18 , the first pressing portion 261 extends along the width of the thermal composite electrode unit by a length d1, and the second pressing portion 262 extends along the width of the thermal composite electrode unit by a length d2. The ratio of the sum of the length d1 of the first pressing portion 261 and the length d2 of the second pressing portion 262 to the width w of the thermal composite electrode unit, i.e., (d1+d2) / w, satisfies the following ratio (1 / 40-1 / 30): 1. The first pressing portion 261 and the second pressing portion 262 are symmetrically arranged.

[0151] The first pressing device 211 contacts the thermal composite electrode unit through the first pressing portion 261, and the second pressing device 212 contacts the thermal composite electrode unit through the second pressing portion 262. The inventors discovered that the ratio of the sum of the length d1 of the first pressing portion 261 and the length d2 of the second pressing portion 262 to the width w of the thermal composite electrode unit, i.e., (d1 + d2) / w, satisfies the following (1 / 40 to 1 / 30): 1. When the ratio (d1 + d2) / w is less than 1 / 40, the pressing force provided by the first and second pressing portions 261, 262 on the thermal composite electrode unit 51 is insufficient, resulting in insufficient alignment of the electrode assemblies in the stacked battery cells. When the ratio (d1 + d2) / w is greater than 1 / 30, the first and second pressing portions 261, 262 press on the thermal composite electrode assembly, leaving marks, which in turn affects the performance of the thermal composite electrode assembly.

[0152] Correspondingly, the third pressing portion 263 extends along the width direction of the thermal composite electrode unit by a length d3, and the fourth pressing portion 264 extends along the width direction of the thermal composite electrode unit by a length d4. The ratio of the sum of the length d3 of the third pressing portion 263 and the length d4 of the fourth pressing portion 264 to the width w of the thermal composite electrode unit, i.e., (d3+d4) / w, satisfies the following equation: (1 / 40-1 / 30): 1. The third pressing portion 263 and the fourth pressing portion 264 are symmetrically arranged.

[0153] The third pressing device 221 contacts the thermal composite electrode unit via the third pressing portion 263, and the fourth pressing device 222 contacts the thermal composite electrode unit via the fourth pressing portion 264. The inventors discovered that the ratio of the sum of the length d3 of the third pressing portion 263 and the length d4 of the fourth pressing portion 264 to the width w of the thermal composite electrode unit (i.e., (d3 + d4) / w) satisfies the following (1 / 40 to 1 / 30): 1. When the ratio (d3 + d4) / w is less than 1 / 40, the pressing force provided by the third and fourth pressing portions 263 and 264 on the thermal composite electrode unit 51 is insufficient, resulting in insufficient alignment of the electrode assemblies in the stacked battery cells. When the ratio (d3 + d4) / w is greater than 1 / 30, the first and second pressing portions 261 and 262 press on the thermal composite electrode assembly, leaving marks, which in turn affects the performance of the thermal composite electrode assembly.

[0154] Referring to Figures 17 and 21, the connecting part of each pressing device includes a first connecting section 255 and a second connecting section 256 that is bent and connected to the first connecting section 255. The end of the first connecting section 255 facing away from the second connecting section 256 is connected to the driving member, and the end of the second connecting section 256 facing away from the first connecting section 255 is connected to the pressing part. The driving member is configured to drive the pressing device to move in a direction perpendicular to the stacking table 11.

[0155] When the thermal composite electrode assembly 5 is located on the first side 151 of the lamination table 11, the first pressing mechanism 21 presses on the thermal composite electrode assembly 5, and the second pressing mechanism 22 is configured to be in a raised state, that is, the second pressing mechanism and the thermal composite electrode assembly 5 are in a non-contact state. When the thermal composite electrode assembly 5 is located on the second side of the lamination table 11, the second pressing mechanism 22 presses on the thermal composite electrode assembly 5, and the first pressing mechanism 21 is in a raised state, that is, the second pressing mechanism and the thermal composite electrode assembly 5 are in a non-contact state.

[0156] Depending on the position of the thermal composite electrode assembly 5, the first pressing mechanism 21 and the second pressing mechanism 22 are in a pressing state and a lifting state, and the driving member is configured to control the corresponding pressing device to adjust from the pressing state to the lifting state. It should be noted that the first pressing device 211 and the second pressing device 212 are in a synchronous state, and the third pressing device 221 and the fourth pressing device 222 are in a synchronous state. Therefore, the driving state of the first pressing device 211 by the first driving member 231 and the driving state of the second pressing device 212 by the second driving member 232 are kept synchronous, and the driving state of the third pressing device 221 by the third driving member 233 and the driving state of the fourth pressing device 222 by the fourth driving member 234 are kept synchronous.

[0157] The first pressing device 211 and the second pressing device 212 are configured to be in a pressing state and a lifting state simultaneously. Correspondingly, the third pressing device 221 and the fourth pressing device 222 are configured to be in a lifting state and a pressing state simultaneously. Specifically, when the thermal composite electrode assembly 5 is on the first side 151 of the stack, the first pressing device 211 and the second pressing device 212 are in a pressing state simultaneously, and the third pressing device 221 and the fourth pressing device 222 are in a lifting state simultaneously. When the thermal composite electrode assembly 5 is on the second side of the stack, the first pressing device 211 and the second pressing device 212 are in a lifting state simultaneously, and the third pressing device 221 and the fourth pressing device 222 are in a pressing state simultaneously.

[0158] In order to increase the moving speed of the pressing device, the pressing part is configured to move in a direction perpendicular to the stacking platform. Taking the first pressing device 211 as an example, when the first pressing device 211 changes from a lifted state to a pressed state, the first pressing part 261 is configured to move in a downward direction perpendicular to the stacking platform. When the first pressing device 211 changes from a pressing device to a lifted state, the first pressing part 261 is configured to move in an upward direction perpendicular to the stacking platform. Therefore, the second connecting section 256 connected to the first pressing section 261 is configured to extend in a direction parallel to one side of the stacking platform, and the first connecting section 255 is configured to extend in a direction perpendicular to the second connecting section 256.

[0159] The driving member can be configured as a movable cylinder that can move up and down perpendicular to the stacking platform, thereby enabling the pressing device to be quickly adjusted according to the different positions of the thermal composite pole piece assembly 5 .

[0160] Continuing to refer to Figures 17, 19 and 20, the lamination device 1 also includes a first support part 131 and a second support part 132, the first pressing mechanism 21 is installed on the first support part 131, and the second pressing mechanism 22 is installed on the second support part 132, the first support part 131 is connected to the first side 151 of the lamination platform 11, and the second support part 132 is connected to the second side of the lamination platform 11.

[0161] 17, 18, and 21, a first baffle 121 is provided on the first side 151 of the laminating platform 11, a second baffle 122 is provided on the second side 152 of the laminating platform 11, a third baffle 123 is provided on the third side of the laminating platform 11, and a fourth baffle 124 is provided on the fourth side of the laminating platform 11. The first side 151 and the second side 152 are disposed opposite each other, and the third side and the fourth side are disposed opposite each other. The first pressing mechanism 21 is located on one side of the first baffle 121, and the second pressing mechanism 22 is located on one side of the second baffle 122. The length of the first baffle 121 extending along the first set of side edges of the laminating platform 11 is less than the distance between the first pressing device 211 and the second pressing device 212, thereby preventing the first baffle 121 from interfering with the first connecting portion 251 and the second connecting portion 252, thereby preventing the first pressing device 211 and the second pressing device 212 from moving up and down in a direction perpendicular to the laminating platform 11. Correspondingly, the length of the second baffle 122 extending along the first group of side edges of the stacking table 11 is smaller than the interval between the third pressing device 221 and the fourth pressing device 222, thereby preventing the second baffle 122 from interfering with the third connecting portion 253 and the fourth connecting portion 254, thereby affecting the up and down movement of the third pressing device 221 and the fourth pressing device 222 in a direction perpendicular to the stacking table 11.

[0162] Continuing to refer to FIG. 17 , the lamination device further includes a driving mechanism 30 , which includes a driving roller assembly 310 , a support frame 320 and a support seat 330 .

[0163] The drive roller assembly 310 includes a first drive roller 311 and a second drive roller 312. The first drive roller 311 and the second drive roller 312 are both configured as cylindrical structures. During the stacking process of the thermal composite electrode assembly 5, the thermal composite electrode assembly 5 is clamped between the first drive roller 311 and the second drive roller 312.

[0164] The support frame 320 includes a hollow receiving cavity, and the first driving roller 311 and the second driving roller 312 are received in the receiving cavity of the support frame 320 .

[0165] The bottom of the support frame 320 is fixed on the support base 330 , and the support frame 320 is configured to slide left and right on the support base 330 . Specifically, a first guide rail 340 is provided on the support base 330 , and a sliding part that can slide on the first guide rail 340 is provided at the bottom of the support frame 320 .

[0166] To improve the lamination efficiency of the lamination device 1, the lamination table 11 and the drive roller assembly 310 are configured to move toward each other. In the related art, during the Z-shaped lamination of the thermal composite electrode assembly 5, the drive roller assembly 310 is configured to reciprocate along the first guide rail 340 on the support seat 330, and the lamination table 11 is in a relatively static state. However, in the embodiment of the present application, the lamination table 11 is configured to move toward each other with the drive roller assembly 310. Taking the movement of the thermal composite electrode assembly 5 from the first side 151 to the second side of the lamination table 11 as an example, the drive roller assembly 310 moves along the first guide rail 340 on the support seat 330 in the x-direction as shown in Figure 17. Correspondingly, the lamination table 11 moves along the second guide rail and in a direction opposite to the y-direction, thereby effectively improving the lamination efficiency.

[0167] In related art, the stacking efficiency of a stacking device is 0.6s / sheet. The inventors have discovered that by configuring the stacking platform 11 to move in a direction opposite to the drive roller assembly 310, the stacking efficiency of the stacking device 1 provided in the present embodiment can reach 0.1s / sheet to 0.3s / sheet, an improvement of at least 100%. In a specific implementation, the stacking efficiency of the stacking device 1 can be 0.1s / sheet, 0.2s / sheet, 0.3s / sheet, or any value between any two of the aforementioned values, or a range between any two of the aforementioned values.

[0168] 17 and 22 , a second guide rail 16 is provided at the bottom of the laminating platform 11 , and the laminating platform 11 is configured to slide along the second guide rail 16 . The second guide rail 16 is located between the first pressing mechanism 21 and the second pressing mechanism 22 .

[0169] When the drive roller assembly 310 drives the thermal composite pole piece assembly 5 along the first guide rail 340 from the first side 151 of the lamination table 11 toward the second side proximate to the lamination table 11, the lamination table 11 is configured to move in the opposite direction along the second guide rail 16. In some implementations, the extension length of the first guide rail 340 is greater than the extension length of the second guide rail 16. Because the drive roller assembly 310 is configured to drive the thermal composite pole piece assembly 5 to move, the thermal composite pole piece assembly 5 is configured to move from the first side 151 of the lamination table 11 to the second side of the lamination table 11. Therefore, the length of the first guide rail 340 is configured to be greater than the length of the lamination table 11, while the second guide rail 16 is configured to allow the lamination table 11 to move. As shown in FIG22 , the second guide rail 16 is located at the bottom of the lamination table 11 and is shorter than the length of the lamination table 11. Therefore, the length of the first guide rail 340 is greater than the length of the second guide rail 16, so as to effectively control the thermal composite pole piece assembly 5 to swing back and forth between the first side 151 and the second side of the lamination table 11.

[0170] 17 and 22 , the laminating device 1 further includes a first monitor 91 and a second deflection correction sensor 92. The first monitor 91 is located on one side of the first pressing mechanism 21, and the second deflection correction sensor 92 is located on one side of the second pressing mechanism 22. Both the first monitor 91 and the second deflection correction sensor 92 are located in the gap between the driving mechanism 30 and the laminating table 11.

[0171] By adding a first monitor 91 and a second correcting sensor 92 in the gap between the driving mechanism 30 and the stacking table 11, the first monitor 91 and the second correcting sensor 92 can capture the entire stacking process of the thermal composite pole piece assembly 5 during the stacking process of the thermal composite pole piece assembly 5. The first monitor 91 is located on one side of the first pressing mechanism 21, and the second correcting sensor 92 is located on one side of the second pressing mechanism 22. Therefore, the first monitor 91 can capture the pressing action provided by the first pressing mechanism 21 to the thermal composite pole piece assembly 5, and the second correcting sensor 92 can capture the pressing action provided by the second pressing mechanism 22 to the thermal composite pole piece assembly 5, thereby preventing the first pressing mechanism 21 and the second pressing mechanism 22 from performing erroneous operations on the thermal composite pole piece assembly 5.

[0172] An embodiment of the present application further provides a thermal composite device, which includes the above-mentioned lamination device and a hot rolling device. The hot rolling device is configured to hot roll the positive electrode sheet, the separator and the negative electrode sheet to form a thermal composite unit to provide a lamination device.

[0173] Among them, the stacking device includes a pressing mechanism, which can provide constant tension to the thermal composite electrode assembly located on the stacking platform, so that the thermal composite electrode assembly is in a constant tension state, thereby effectively improving the alignment of the electrode assembly in the stacked battery cell.

[0174] Compared to the Z-shaped lamination method in the related art, the negative electrode sheet unloading device, the separator unwinding device, and the positive electrode sheet unloading device are sequentially arranged on the stacking table, and the separator swings back and forth on the stacking table, which limits the lamination efficiency. In the thermal lamination equipment provided in this application, the positive electrode sheet, separator, and negative electrode sheet are first hot-rolled by a hot rolling device to form a hot composite unit, which is then provided to the lamination device. The driving mechanism and stacking table in the lamination device can be configured to move in opposite directions, thereby effectively improving the lamination efficiency.

Claims

1. A lamination device (1) configured to process a pole piece assembly, the pole piece assembly (5) including a plurality of thermally compounded pole piece units (51), the lamination device (1) comprising: A lamination table (11) configured to stack a plurality of the thermally compounded pole piece units (51); And A driving mechanism (30), the driving mechanism (30) including a first driving roller assembly (31) and a second driving roller assembly (32), the first driving roller assembly (31) and the second driving roller assembly (32) being spaced apart on the same side of the lamination table (11) and configured to clamp the pole piece assembly (5) to drive the pole piece assembly (5) to move; Wherein, a first gap is provided between the first driving roller assembly (31) and the second driving roller assembly (32), the width of the first gap being set as d1, and the length of the thermally compounded pole piece unit (51) being set as 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, wherein, The first driving roller assembly (31) includes a first driving roller (311) and a second driving roller (312) arranged oppositely, a second gap being formed between the first driving roller (311) and the second driving roller (312); The second driving roller assembly (32) includes a third driving roller (321) and a fourth driving roller (322) arranged oppositely, a third gap being formed between the third driving roller (321) and the fourth driving roller (322); Both the second gap and the third gap are set to be not greater than the thickness of the pole piece unit; and / or, Both the second gap and the third gap are set to be 118 μm to 460 μm.

3. The lamination device according to claim 2, wherein, The second gap and the third gap are set to be the same.

4. The lamination device according to claim 2, wherein, Further included is a roller driving member (33) configured to drive the first driving roller assembly (31) or the second driving roller assembly (32); the first driving roller (311) and the third driving roller (321) are set as driving rollers, the second driving roller (312) and the fourth driving roller (322) are set as driven rollers, the roller driving member (33) is configured to be connected to the driving roller and drive the driving roller to rotate to drive the pole piece assembly (5) to move, the outer surface of one of the driving roller and the driven roller being set as a soft and rough surface, and the outer surface of the other of the driving roller and the driven roller being set as a hard and smooth surface.

5. The lamination device according to any one of claims 1-4, wherein, The rotation speed of the first driving roller assembly (31) is set to be 1 rpm / nim to 40 rpm / nim, and the first driving roller assembly (31) is configured to drive the pole piece assembly (5) to move at a speed of 1 m / min to 100 m / min; and / or, The rotation speed of the second driving roller assembly (32) is set to be 1 rpm / nim to 40 rpm / nim, and the second driving roller assembly (32) is configured to drive the pole piece assembly (5) to move at a speed of 1 m / min to 100 m / min; and / or, The rotational speed of the first driving roller assembly (31) is configured to be the same as that of the second driving roller assembly (32).

6. The lamination device according to claim 1, wherein, It further includes a first support platform (314) and a second support platform (324) which are spaced apart. The first driving roller assembly (31) is installed on the first support platform (314), and the second driving roller assembly (32) is installed on the second support platform (324). The first driving roller assembly (31) is configured to be movable on the first support platform (314), and / or the second driving roller assembly (32) is configured to be movable on the second support platform (324).

7. The lamination device according to claim 6, wherein, It further includes a first support frame (313) and a second support frame (323) which are spaced apart. The first driving roller assembly (31) is disposed inside the first support frame (313), and the second driving roller assembly (32) is disposed inside the second support frame (323). The first support frame (313) is fixed to the first support platform (314), and / or the second support frame (323) is fixed to the second support platform (324).

8. The lamination device according to claim 7, wherein, It further includes a plurality of limiting members (12) disposed on the lamination table (11). The plurality of limiting members (12) are arranged to limit the position of the pole piece assembly (5), and the positions of at least some of the plurality of limiting members (12) are configured to be adjustable.

9. The lamination device according to claim 8, wherein, The first support frame (313), the second support frame (323), and the lamination table (11) are arranged in parallel in sequence, and the lamination table (11) is configured to be movable in a direction approaching or away from the second support frame (323).

10. The lamination device according to claim 6, wherein, It further includes at least two monitors (9) which are spaced apart and are arranged to monitor the pole piece assembly (5). The at least two monitors (9) are disposed between the second support platform (324) and the lamination table (11). One of the at least two monitors (9) is located on one side of the second driving roller assembly (32), and the other of the at least two monitors (9) is located on the other side of the second driving roller assembly (32).

11. The lamination device according to claim 1, wherein, The lamination device includes: A receiving assembly (10) which is arranged vertically below the driving mechanism (30). The receiving assembly (10) includes a lamination table (11) and limiting members (12). A plurality of the thermocompound pole piece units (51) are bent and laminated on the lamination table (11). The limiting members (12) are arranged around the circumference of the lamination table (11) at the edge of the lamination table (11), and the limiting members (12) are arranged to limit the position of the thermocompound pole piece units (51) in the horizontal direction; Wherein, the lamination table (11) is capable of vibrating in the horizontal direction so that the edges of the plurality of thermocompound pole piece units (51) abut against the limiting members (12) and are aligned.

12. The lamination device according to claim 11, wherein, The receiving assembly (10) further includes a lamination table driving member (13). The driving end of the lamination table driving member (13) is drivingly connected to the lamination table (11) to drive the lamination table (11) to vibrate.

13. The lamination device according to claim 12, wherein, The lamination device further includes a stacking table position adjuster (14). The stacking table position adjuster (14) has a first mounting portion (141) and a first adjusting portion (142). The first adjusting portion (142) is movably arranged on the first mounting portion (141). The first adjusting portion (142) is fixedly connected to the stacking table driving member (13) and can drive the stacking table driving member (13) to move in a first direction.

14. The lamination device according to claim 13, wherein, The lamination device further includes a driving roller position adjuster (35). The driving roller position adjuster (35) has a second mounting portion (351) and a second adjusting portion (352). The second adjusting portion (352) is movably arranged on the second mounting portion (351). The second adjusting portion (352) is fixedly connected to the first driving roller assembly (31) or the second driving roller assembly (32) and can drive the first driving roller assembly (31) or the second driving roller assembly (32) to move in the first direction.

15. The lamination device according to any one of claims 11-13, wherein, The first driving roller assembly (31) includes a first driving roller (311) and a second driving roller (312) arranged oppositely. The second driving roller assembly (32) includes a third driving roller (321) and a fourth driving roller (322) arranged oppositely. And / or, the rotation directions of the first driving roller (311) and the second driving roller (312) are opposite, and the rotation directions of the third driving roller (321) and the fourth driving roller (322) are opposite.

16. The laminating device according to claim 15, wherein, The first driving roller assembly (31) or the second driving roller assembly (32) further includes a roller driving member (33). The driving end of the roller driving member (33) is drivingly connected to one of the first driving roller (311) and the second driving roller (312). The first driving roller (311) and the second driving roller (312) are in transmission connection to rotate simultaneously. Or, the driving end of the roller driving member (33) is drivingly connected to one of the third driving roller (321) and the fourth driving roller (322). The third driving roller (321) and the fourth driving roller (322) are in transmission connection to rotate simultaneously.

17. The lamination device according to claim 14, wherein, The lamination device further includes a monitor (9). The monitor (9) is arranged between the driving mechanism (30) and the receiving assembly (10). The monitor (9) is configured to monitor the position of the thermally compounded pole piece unit (51). The monitor (9) is respectively in communication connection with the stacking table position adjuster (14) and the driving roller adjuster (50). The stacking table position adjuster (14) and the driving roller adjuster (50) can receive the signal of the monitor (9) to adjust the position of the thermally compounded pole piece unit (51).

18. The lamination device according to claim 17, wherein, There are two monitors (9). The two monitors (9) are arranged oppositely along the horizontal direction on both sides of the thermally compounded pole piece unit (51).

19. The lamination device according to claim 18, wherein, The lamination device further includes side plates (110). The stacking table position adjuster (14) and the driving roller adjuster (50) are both fixed on the side plates (110).

20. The lamination device according to claim 1, wherein, Further included: It is set to at least one pressing mechanism (20), and the pressing mechanism (20) includes a first pressing mechanism (21) arranged on the first side (151) of the stacking table (11). The first pressing mechanism (21) includes a first pressing device (211) and a second pressing device (212) arranged oppositely. The interval between the first pressing device (211) and the second pressing device (212) is greater than or equal to the width of the thermally compounded pole piece unit (51), such that the first pressing device (211) presses on one side (510) of the thermally compounded pole piece unit, and the second pressing device (212) presses on the other side (520) of the thermally compounded pole piece unit (51). Wherein, one side (510) of the thermally compounded pole piece unit is arranged oppositely to the other side (520) of the thermally compounded pole piece unit, and the interval between one side (510) and the other side (520) of the thermally compounded pole piece unit is set to the width of the thermally compounded pole piece unit (51).

21. The laminating device according to claim 20, wherein, The interval between the first pressing device (211) and the second pressing device (212) is set to 100 mm to 600 mm.

22. The laminating device according to claim 20, wherein, At least one of the pressing mechanisms (20) further includes a second pressing mechanism (22) arranged on the second side (152) of the stacking table (11). The second pressing mechanism (22) includes a third pressing device (221) and a fourth pressing device (222) arranged oppositely. The interval between the third pressing device (221) and the fourth pressing device (222) is equal to the width of the thermally compounded pole piece unit (51), and the first side (151) and the second side (152) are arranged oppositely; When the thermally compounded pole piece unit (51) is located on the first side (151) of the stacking table (11), the first pressing mechanism (21) is set to press the thermally compounded pole piece unit (51); when the thermally compounded pole piece unit (51) is located on the second side (152) of the stacking table (11), the second pressing mechanism (22) is set to press the thermally compounded pole piece unit (51).

23. The lamination device according to claim 22, wherein, The first pressing device (211), the second pressing device (212), the third pressing device (221), and the fourth pressing device (222) each include a driving member (231, 232, 233, 234) and a pressing member (241, 242, 243, 244). The pressing member (241, 242, 243, 244) includes a connecting portion (251, 252, 253, 254) connected to the driving member (231, 232, 233, 234) and a pressing portion (261, 262, 263, 264) connected to the connecting portion (251, 252, 253, 254). The driving member (231, 232, 233, 234) is configured to drive the pressing portion (261, 262, 263, 264) to move in a direction approaching or away from the lamination table (11). The extending direction of the pressing portion (261, 262, 263, 264) is configured to be the same as the width direction of the thermally composite electrode sheet unit (51). The first pressing device (211) includes a first pressing member (241), the first pressing member (241) includes a first pressing portion (261), the second pressing device (212) includes a second pressing member (242), the second pressing member (242) includes a second pressing portion (262), and the extending directions of the first pressing portion (261) and the second pressing portion (262) are opposite; and / or, the third pressing device (221) includes a third pressing portion (263), the fourth pressing device (222) includes a fourth pressing portion (264), and the extending directions of the third pressing portion (263) and the fourth pressing portion (264) are opposite.

24. The lamination device according to claim 23, wherein, The length of the first pressing portion (261) extending along the width direction of the thermally composite electrode sheet unit (51) is d1, the length of the second pressing portion (262) extending along the width direction of the thermally composite electrode sheet unit (51) is d2, the width of the thermally composite electrode sheet unit (51) is w, and (d1 + d2) / w satisfies: 1 / 40 ≤ (d1 + d2) / w ≤ 1 / 30; and / or, The length of the third pressing portion (263) extending along the width direction of the thermally composite electrode sheet unit (51) is d3, the length of the fourth pressing portion (264) extending along the width direction of the thermally composite electrode sheet unit (51) is d4, the width of the thermally composite electrode sheet unit (51) is w, and (d3 + d4) / w satisfies: 1 / 40 ≤ (d3 + d4) / w ≤ 1 / 30.

25. The lamination device according to claim 22, wherein, The laminating device includes a first baffle (121) located on the first side (151) of the laminating table (11), and a second baffle (122) located on the second side (152) of the laminating table (11); the first pressing mechanism (21) is located on one side of the first baffle (121), and the second pressing mechanism (22) is located on one side of the second baffle (122); the length of the first baffle (121) extending along the first set of side edges of the laminating table (11) is less than the interval between the first pressing device (211) and the second pressing device (212); and / or, the length of the second baffle (122) extending along the first set of side edges of the laminating table (11) is less than the interval between the third pressing device (221) and the fourth pressing device (222).

26. The lamination device according to claim 22, wherein, The driving mechanism (30) is arranged above the laminating table (11), and is configured such that the first driving roller assembly (31) or the second driving roller assembly (32) and the laminating table (11) are configured to move towards each other.

27. The lamination device according to claim 26, wherein, The driving mechanism (30) includes a first guide rail (340) provided for the first driving roller assembly (31) or the second driving roller assembly (32) to move, and the laminating device further includes a second guide rail (16) provided for the laminating table (11) to move, and the extension length of the first guide rail (340) is greater than the extension length of the second guide rail (16).

28. The lamination device according to claim 26 or 27, wherein, The laminating device further includes a first monitor (91) and a second monitor (92), both the first monitor (91) and the second monitor (92) are located in the interval between the driving mechanism (30) and the laminating table (11), the first monitor (91) is located on one side of the first pressing mechanism (21), and the second monitor (92) is located on one side of the second pressing mechanism (22).

29. A processing method for a pole piece assembly, the pole piece assembly is processed by using the laminating device according to any one of claims 1-10, and the processing method includes: The first driving roller assembly (31) and the second driving roller assembly (32) simultaneously drive the thermocompound pole piece unit (51) to move towards the direction close to the laminating table (11), so that the thermocompound pole piece unit (51) sequentially passes through the first driving roller assembly (31) and the second driving roller assembly (32), wherein the thermocompound pole piece unit includes a positive pole piece (511), a first separator (5131), a negative pole piece (512) and a second separator (5132) stacked in sequence; The laminating table (11) stacks a plurality of the thermocompound pole piece units (51) to form a battery core package.

30. The processing method of the electrode sheet assembly according to claim 29, wherein, The processing method further includes: Adjusting the position of the first driving roller assembly (31) on the first support table (314), and / or adjusting the position of the second driving roller assembly (32) on the second support table (324), so as to adjust the position of the thermocompound pole piece unit (51) relative to the laminating table (11).

31. A thermal lamination device, the thermal lamination device includes the lamination device (1) according to any one of claims 1-28 and a thermal roll-pressing device (8), and the thermal roll-pressing device (8) is configured to thermally roll-press a positive electrode sheet (511), a separator (513) and a negative electrode sheet (512) to form a thermally laminated electrode unit (51) and then supply it to the lamination device (1).

Images