Lamination device and thermal compounding equipment

Abstract

The utility model provides a lamination device and thermal compounding equipment, and the lamination device comprises a lamination platform which is used for stacking a plurality of thermal compounding pole piece units; the at least one pressing mechanism comprises a first pressing mechanism arranged on the first side of the stacking table, the first pressing mechanism comprises a first pressing device and a second pressing device which are oppositely arranged, and the interval between the first pressing device and the second pressing device is equal to the width of the thermal composite pole piece unit; the first pressing device is pressed on one side of the thermal composite pole piece unit, and the second pressing device is pressed on the other side of the thermal composite pole piece unit.

Description

Technical Field

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

[0002] In the related art, the positive electrode sheet, the separator, and the negative electrode sheet are thermally composited to form a thermally composite electrode sheet, and the strip-shaped thermally composite electrode sheets are stacked on a stacking table to form an electrode sheet assembly in a single cell.

[0003] The thermal composite pole piece is in a free fall state during the lamination process. The thermal composite pole piece is only shaped by the shaping cylinder, which leads to poor overall alignment of the pole piece assembly in the single cell, which can only reach ±1.0mm. In addition, the thermal composite lamination process in the related art is only applicable to thermal composite pole pieces with a stacking width of no more than 150mm. When the width is greater than 340mm, the thermal composite pole piece arches upward during the stacking process, which leads to worse overall alignment of the pole piece assembly in the formed single cell. Utility Model Content

[0004] The embodiments of the utility model provide a lamination device and a thermal composite device, which can improve the technical problem of poor uniformity of pole piece assemblies in a single cell formed by stacking the lamination device.

[0005] In a first aspect, an embodiment of the present utility model provides a lamination device, the lamination device comprising:

[0006] A stacking platform, used for stacking multiple thermal composite pole piece units;

[0007] At least one pressing mechanism, the pressing mechanism includes a first pressing mechanism arranged on the first side of the stack, the first pressing mechanism includes a first pressing device and a second pressing device arranged opposite to each other, the interval between the first pressing device and the second pressing device is equal to the width of the thermal composite pole piece unit, so that the first pressing device presses on one side of the thermal composite pole piece unit, and the second pressing device presses on the other side of the thermal composite pole piece unit, wherein one side of the thermal composite pole piece unit is arranged opposite to the other side of the thermal composite pole piece unit, and the interval between one side of the thermal composite pole piece unit and the other side of the thermal composite pole piece unit is set to the width of the thermal composite pole piece unit.

[0008] In one embodiment, the interval between the first pressing device and the second pressing device is set to 100 mm to 600 mm.

[0009] In one embodiment, at least one of the pressing mechanisms further comprises a second pressing mechanism disposed on the second side of the stack, the second pressing mechanism comprises a third pressing device and a fourth pressing device disposed opposite to each other, the interval between the third pressing device and the fourth pressing device is equal to the width of the thermal composite electrode unit, and the first side and the second side are disposed opposite to each other;

[0010] When the thermal composite pole piece unit is located on the first side of the stack, the first pressing mechanism is used to press the thermal composite pole piece unit; when the thermal composite pole piece unit is located on the second side of the stack, the second pressing mechanism is used to press the thermal composite pole piece unit.

[0011] In one embodiment, the first pressing device, the second pressing device, the third pressing device and the fourth pressing device 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 is used to drive the pressing portion to move toward or away from the stack, and the extending direction of the pressing portion is configured to be the same as the width direction of the thermal composite electrode unit;

[0012] The first pressing device includes a first pressing member, the first pressing member includes a first pressing portion, the second pressing device includes a second pressing member, the second pressing member includes a second pressing portion, and the first pressing portion and the second pressing portion have opposite extension directions; and / or the third pressing device includes a third pressing portion, the fourth pressing device includes a fourth pressing portion, and the third pressing portion and the fourth pressing portion have opposite extension directions.

[0013] In one embodiment, the length of the first pressing portion extending along the width direction of the thermal composite pole piece is d1, the length of the second pressing portion extending along the width direction of the thermal composite pole piece is d2, the width of the thermal composite pole piece unit is w, (d1+d2) / w satisfies: 1 / 40≤(d1+d2) / w≤1 / 30; and / or, the length of the third pressing portion extending along the width direction of the thermal composite pole piece is d3, the length of the fourth pressing portion extending along the width direction of the thermal composite pole piece is d4, the width of the thermal composite pole piece unit is w, (d3+d4) / w satisfies: 1 / 40≤(d3+d4) / w≤1 / 30.

[0014] In one embodiment, the first pressing device and the second pressing device are configured to be in a pressing state and a lifting state synchronously, and correspondingly, the third pressing device and the fourth pressing device are configured to be in a lifting state and a pressing state synchronously;

[0015] When the thermal composite pole piece unit is located at the first side of the stack, the first pressing device and the second pressing device are both in a pressing state, and the third pressing device and the fourth pressing device are both in a lifting state;

[0016] When the thermal composite pole piece unit is located at the second side of the stack, the third pressing device and the fourth pressing device are both in a pressing state, and the first pressing device and the second pressing device are both in a lifting state.

[0017] In one embodiment, the stacking device includes a first baffle located on one side of the stacking platform, and a second baffle located on the other side of the stacking platform; the first pressing mechanism is located on one side of the first baffle, and the second pressing mechanism is located on one side of the second baffle; the length of the first baffle extending along another set of side edges of the stacking platform is less than the interval between the first pressing device and the second pressing device; and / or the length of the second baffle extending along another set of side edges of the stacking platform is less than the interval between the third pressing device and the fourth pressing device.

[0018] In one embodiment, the stacking device further comprises a driving mechanism, wherein the driving mechanism is disposed on the stacking platform, and the driving mechanism comprises a driving roller assembly, wherein the driving roller assembly and the stacking platform are configured to move toward each other.

[0019] In one embodiment, the driving mechanism includes a first guide rail for moving the driving roller assembly, and the stacking device also includes a second guide rail for moving the stacking platform, and an extension length of the first guide rail is greater than an extension length of the second guide rail.

[0020] In one embodiment, the stacking speed of the stacking device is 0.1S / sheet to 0.3S / sheet.

[0021] In one embodiment, the stacking device further includes a first skew correction sensor and a second skew correction sensor, both of which are located in the gap between the driving mechanism and the stacking platform, the first skew correction sensor is located on one side of the first pressing mechanism, and the second skew correction sensor is located on one side of the second pressing mechanism.

[0022] In the second aspect, an embodiment of the utility model provides a thermal composite device, which includes the above-mentioned lamination device and hot rolling composite device, and the hot rolling composite device is used to hot roll the positive electrode plate, the separator and the negative electrode plate to form a thermal composite unit and then provide it to the lamination device.

[0023] Beneficial effects of the embodiments of the utility model:

[0024] In an embodiment of the utility model, a pressing mechanism is used to replace the shaping cylinder in the related art. During the stacking process of the thermal composite pole piece assembly, the first pressing device and the second pressing device press the two sides of the thermal composite pole piece assembly respectively, so that there is pressing tension during the stacking process of the thermal composite pole piece assembly from the driving mechanism to the stacking platform, which helps to improve the overall alignment of the pole piece assembly of the stacked battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 It is a flow chart of a thermal composite process provided by an embodiment of the utility model;

[0027] Figure 2 This is a flow chart of a thermal composite process provided by another embodiment of the utility model;

[0028] Figure 3 It is a structural schematic diagram of a lamination device of the related art;

[0029] Figure 4 It is a three-dimensional diagram of a lamination device provided by an embodiment of the utility model from one viewing angle;

[0030] Figure 5 It is a top view of a stacking platform provided by one embodiment of the utility model;

[0031] Figure 6 yes Figure 4 A magnified image of point A;

[0032] Figure 7 yes Figure 5 The enlarged view of point B;

[0033] Figure 8 It is a three-dimensional diagram of another viewing angle of the lamination device provided by one embodiment of the utility model;

[0034] Fig. 9 It is a three-dimensional diagram of another viewing angle of a lamination device provided by an embodiment of the utility model;

[0035] Figure Number:

[0036] 1. Lamination device; 10. Lamination platform; 11. Stopper; 111. First stopper; 112. Second stopper; 113. Third stopper; 114. Fourth stopper; 12. Second guide rail; 131. First support platform; 132. Second support platform; 141. First side; 142. 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 driving member; 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. First pressing member Four pressing members; 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; 30, driving mechanism; 31, driving roller assembly; 311, first driving roller; 312, second driving roller; 32, supporting frame; 33, supporting platform; 34, first guide rail; 41, first deviation correction sensor; 42, second deviation correction sensor; 2, thermal composite pole piece assembly; 200, thermal composite pole piece unit; 210, one side of the thermal composite pole piece unit; 220, the other side of the thermal composite pole piece unit; 3, shaping cylinder. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model. In the utility model, unless otherwise stated, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0038] The electrode assembly in the battery cell is usually formed by stacking the positive electrode, the separator and the negative electrode through a thermal composite lamination process. The thermal composite electrode assembly includes a plurality of 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 separators. Each thermal composite electrode unit includes a negative electrode, a first separator, a positive electrode and a second separator stacked in sequence.

[0039] like Figure 1 and Figure 2 As shown in the figure, the thermal composite lamination process used in batteries includes:

[0040] Provide negative electrode sheets, separators and positive electrode sheets;

[0041] 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 through a blank section, and a plurality of connected thermal composite electrode sheet units form a thermal composite electrode sheet assembly;

[0042] 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;

[0043] Stacking a plurality of thermal composite electrode units through a lamination device to form an electrode assembly in a battery cell;

[0044] The electrode components in two adjacent battery cells are cut into blank sections;

[0045] The electrode assembly in the battery cell is hot pressed to form a battery cell core package.

[0046] Among them, the negative electrode sheet is to unwind the rolled negative electrode sheet continuously onto the operating table, and cut and remove dust on the operating table to form a certain specification of negative electrode sheet. The diaphragm is to unwind the rolled diaphragm continuously onto the operating table, and perform position correction and static electricity removal on the operating table. The diaphragm unwinding is located after the negative electrode unwinding. The positive electrode sheet is to unwind the rolled positive electrode sheet continuously onto the operating table, and cut and remove dust on the operating table to form a certain specification of positive electrode sheet. The positive electrode sheet unwinding is located after the diaphragm unwinding. The blank section in the thermal composite electrode unit includes two layers of diaphragms.

[0047] like Figure 3 As shown, during the lamination process, the thermal composite pole piece assembly 2 is configured to be driven by a driving mechanism, the driving mechanism includes a first driving roller 311 and a second driving roller 312, and the thermal composite pole piece assembly 2 is clamped between the first driving roller 311 and the second driving roller 312. During the process of being provided to the lamination stage by the driving mechanism, the thermal composite pole piece assembly 2 is in a free fall state, as shown in FIG. Figure 3As shown by the arrow X in the figure. Since the thermal composite pole piece assembly 2 is in a free fall state during the stacking process, the thermal composite pole piece assembly 2 is only shaped by the shaping cylinders 3 arranged on both sides of the stacking platform, which results in poor overall alignment of the pole piece assembly in the single cell, which can only reach ±1.0mm. In addition, the thermal composite lamination process in the related art is only applicable to thermal composite pole piece assemblies with a pole piece width of no more than 150mm. When the pole piece width is greater than 340mm, the pole piece assembly will be arched upward during the lamination process, which results in a worse overall alignment of the pole piece assembly in the formed single cell, and thus cannot be applied in the industry.

[0048] Furthermore, during the process of shaping the thermal composite pole piece assembly 2, the shaping cylinders 3 arranged on both sides of the stacking platform mainly beat the thermal composite pole piece assembly 2 by the shaping cylinders 3, which may cause the active materials 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 in the battery cell.

[0049] Furthermore, the spacing of the blank section between two adjacent thermal composite sheet units 200 is 1±0.3 mm, and the precision of the blank section itself is poor, which results in that during the Z-shaped folding of the thermal composite electrode assembly 2, the crease between two adjacent battery cells is not set in the middle of the spacing of the blank section.

[0050] 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 art is poor and can only be applied to thermal composite electrode assemblies with a width of no more than 150 mmd of thermal composite electrode units, the embodiments of the present application improve the structure of the lamination device.

[0051] refer to Figures 4 to 6 The utility model provides a lamination device 1, which includes a lamination platform 10 and at least one pressing mechanism 20.

[0052] The stacking platform 10 is used for stacking the thermal composite pole piece assemblies 2. A stopper 11 is provided on each side of the stacking platform 10, and a plurality of stoppers 11 define a stacking area for the thermal composite pole piece assemblies 2. The stoppers 11 are configured to be adjustable, and the area size of the stacking platform 10 where the thermal composite pole piece assemblies 2 can be stacked is adjusted by adjusting the position of the stoppers 11.

[0053] The pressing mechanism 20 includes a first pressing mechanism 21 disposed on the first side 141 of the stack 10, and the first pressing mechanism 21 includes a first pressing device 211 and a second pressing device 212. The interval between the first pressing device 211 and the second pressing device 212 is equal to the width w of the thermal composite electrode unit 200, and the first pressing device 211 presses on one side 210 of the thermal composite electrode assembly, and the second pressing device 212 presses on the other side 220 of the thermal composite electrode assembly. The interval between the one side 210 of the thermal composite electrode assembly and the other side 220 of the thermal composite electrode assembly is set to the width w of the thermal composite electrode assembly.

[0054] 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 2, the first pressing device 211 and the second pressing device 212 respectively press the two sides of the thermal composite pole piece assembly 2 in the width direction, so that there is pressing tension in the process of the thermal composite pole piece assembly 2 moving from the driving mechanism to the stacking platform 10, which helps to improve the overall alignment of the pole piece assembly of the battery cell.

[0055] Through research, the inventors found that the alignment degree of the pole piece assemblies in the battery cell formed by stacking the thermal composite pole piece assemblies using the lamination device in the related technology can only reach ±1.0mm, while the alignment degree of the pole piece assemblies in the battery cell formed by stacking the thermal composite pole piece assemblies 2 using the lamination device 1 provided by the utility model can be improved to ±0.05mm. The alignment accuracy improvement rate of the pole piece assemblies of the battery cell reaches 100%, which is crucial to improving the performance of the battery cell.

[0056] 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 a value between any two of the above values ​​or a range between any two of the above values.

[0057] The interval d between the first pressing device 211 and the second pressing device 212 is mainly adjusted according to the width of the thermal composite pole piece unit 200. When the width of the thermal composite pole piece unit 200 is set to 150 mm, the interval d between the first pressing device 211 and the second pressing device 212 is set to 150 mm. When the width of the thermal composite pole piece unit 200 is set to 340 mm, the interval d between the first pressing device 211 and the second pressing device 212 is set to 340 mm.

[0058] In some embodiments, the interval 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, and the adjusting member adjusts the interval between the first pressing device 211 and the second pressing device 212 according to the width of the thermal composite pole piece assembly 2, so that the lamination device can be compatible with the lamination requirements of thermal composite pole piece assemblies 2 of different sizes. Furthermore, the present application does not exclude that in the same lamination device, the interval between the first pressing device 211 and the second pressing device 212 is set to a certain value, and in different lamination devices, the interval between the first pressing device 211 and the second pressing device 212 is set to different values.

[0059] Furthermore, since both sides of the thermal composite pole piece assembly 2 are pressed by the first pressing device 211 and the second pressing device 212 during the process of the thermal composite pole piece assembly 2 moving from the self-driving mechanism 30 to the stacking platform 10, even when the width w of the thermal composite pole piece unit 200 is large, for example, when the width w of the thermal composite pole piece unit 200 is greater than 340 mm, the thermal composite pole piece assembly 2 is in a tensioned state, thereby effectively improving the upward micro-arch structure formed by the thermal composite pole piece assembly 2 during the stacking process, so that the wide thermal composite pole piece assembly 2 can maintain a high degree of alignment when stacked using the stacking device 1 provided in the embodiment of the present application. The inventors have found through research that the alignment of the pole piece assembly in the battery cell formed by stacking the wide thermal composite pole piece assembly 2 using the stacking 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 pole piece assembly 2 that the stacking device 1 can be compatible with.

[0060] Continue to refer Figures 4 to 6 The pressing mechanism 20 further includes a second pressing mechanism 22 arranged opposite to the first pressing mechanism 21, and the second pressing mechanism 22 includes a third pressing device 221 and a fourth pressing device 222, and the interval 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 200, wherein the first pressing mechanism 21 is arranged on the first side 141 of the stack 10, and the second pressing mechanism 22 is arranged on the second side 142 of the stack 10. When the thermal composite electrode unit 200 is located on the first side 141 of the stack 10, the first pressing mechanism 21 provides a constant pressing tension to the thermal composite electrode unit 200, and when the thermal composite electrode unit 200 is located on the second side 142 of the stack 10, the second pressing mechanism 22 provides a constant pressing tension to the thermal composite electrode unit 200, thereby facilitating the Z-shaped stacking of the thermal composite electrode assembly 2 on the stack 10.

[0061] The first pressing mechanism 21 and the second pressing mechanism 22 have the same structure and are completely symmetrically arranged. Figure 5As shown, the first pressing device 211 and the third pressing device 221 are arranged opposite to each other, and the second pressing device 212 and the fourth pressing device 222 are arranged opposite to each other.

[0062] Continue to refer Figures 4 to 6 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 used to drive the pressing portion to move toward or away from the stacking platform 10, the pressing portion is used to press the electrode thermal composite, that is, the electrode unit 200, and the extension direction of the pressing portion is configured to be the same as the width direction of the thermal composite electrode unit 200.

[0063] like Figure 4 and Figure 6 As shown, the first pressing device 211 includes a first driving member 231 and a first pressing member 241, and 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, and 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 pole piece assembly 2, and the extension direction of the first pressing portion 261 is opposite to the extension direction of the second pressing portion 262. When the thermal composite pole piece assembly 2 is located on the first side 141 of the stack 10, the first pressing portion 261 presses on one side 210 of the thermal composite pole piece assembly, and the second pressing portion 262 presses on the other side 220 of the thermal composite pole piece assembly.

[0064] When the thermal composite pole piece assembly 2 is located at the first side 141 of the stacking platform 10, the first pressing portion 261 and the second pressing portion 262 are arranged opposite to each other, and the first pressing portion 261 and the second pressing portion 262 are pressed on the thermal composite pole piece assembly 2 at the same time. The sum of the contact areas of the first pressing portion 261 and the second pressing portion 262 with the thermal composite pole piece assembly 2 is configured as the contact area of ​​the first pressing mechanism 21 with the thermal composite pole piece assembly 2. The first connecting portion 251 and the second connecting portion 252 are preferably arranged not to contact the thermal composite pole piece assembly 2. Further, the first pressing portion 261 and the second pressing portion 262 are both arranged to extend along the width direction of the thermal composite pole piece assembly 2, so that the first pressing device 211 and the second pressing device 212 can provide a pressing force along the width direction of the thermal composite pole piece assembly 2, and the pressing force is perpendicular to the stacking direction of the thermal composite pole piece assembly 2, so that the thermal composite pole piece assembly 2 can fit as closely as possible on the stacking platform 10.

[0065] like Figure 4 and Figure 7As shown, the third pressing device 221 includes a third driving member 233 and a third pressing member 243, and 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, and 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 are both extended along the width direction of the thermal composite pole piece assembly 2, 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 pole piece assembly 2 is located on the second side of the stack 10, the third pressing portion 263 presses on one side of the thermal composite pole piece assembly 2, and the fourth pressing portion 264 presses on the other side of the thermal composite pole piece assembly 2.

[0066] When the thermal composite pole piece assembly 2 is located on the second side of the stacking platform 10, the third pressing portion 263 and the fourth pressing portion 264 are arranged opposite to each other, and the third pressing portion 263 and the fourth pressing portion 264 are pressed on the thermal composite pole piece assembly 2 at the same time, and the sum of the contact areas of the third pressing portion 263 and the fourth pressing portion 264 with the thermal composite pole piece assembly 2 is configured as the contact area of ​​the first pressing mechanism 21 with the thermal composite pole piece assembly 2. The third connecting portion 253 and the fourth connecting portion 254 are preferably arranged not to contact the thermal composite pole piece assembly 2. Further, the third pressing portion 263 and the fourth pressing portion 264 are both arranged to extend along the width direction of the thermal composite pole piece assembly 2, so that the third pressing device 221 and the fourth pressing device 222 can provide a pressing force along the width direction of the thermal composite pole piece assembly 2, and the pressing force is perpendicular to the stacking direction of the thermal composite pole piece assembly 2, so that the thermal composite pole piece assembly 2 can fit as closely as possible on the stacking platform 10.

[0067] Continue to refer Figure 5 , the length of the first pressing portion 261 extending along the width direction of the thermal composite electrode unit is d1, the length of the second pressing portion 262 extending along the width direction of the thermal composite electrode unit is d2, and 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: (1 / 40-1 / 30): 1. The first pressing portion 261 and the second pressing portion 262 are preferably configured to be symmetrical.

[0068] The first pressing device 211 contacts the thermal composite pole piece unit through the first pressing part 261, and the second pressing device 212 contacts the thermal composite pole piece unit through the second pressing part 262. The inventor found through research that the ratio of the sum of the length d1 of the first pressing part 261 and the length d2 of the second pressing part 262 to the width w of the thermal composite pole piece unit, that is, (d1+d2) / w, satisfies: (1 / 40~1 / 30): 1. When the ratio of (d1+d2) / w is less than 1 / 40, the pressing force provided by the first pressing part 261 and the second pressing part 262 to the thermal composite pole piece unit 200 is insufficient, thereby making the alignment of the pole piece assembly in the stacked battery cell unable to meet the requirements. When the ratio of (d1+d2) / w is greater than 1 / 30, the first pressing part 261 and the second pressing part 262 press on the thermal composite pole piece assembly to form an imprint, thereby affecting the performance of the thermal composite pole piece assembly.

[0069] Correspondingly, the length of the third pressing portion 263 extending along the width direction of the thermal composite electrode unit is d3, the length of the fourth pressing portion 264 extending along the width direction of the thermal composite electrode unit is d4, and 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: (1 / 40-1 / 30): 1. The third pressing portion 263 and the fourth pressing portion 264 are preferably configured to be symmetrical.

[0070] The third pressing device 221 contacts the thermal composite pole piece unit through the third pressing part 263, and the fourth pressing device 222 contacts the thermal composite pole piece unit through the fourth pressing part 264. The inventor found through research that the ratio of the sum of the length d3 of the third pressing part 263 and the length d4 of the fourth pressing part 264 to the width w of the thermal composite pole piece unit, that is, (d3+d4) / w, satisfies: (1 / 40~1 / 30): 1. When the ratio of (d3+d4) / w is less than 1 / 40, the pressing force provided by the third pressing part 263 and the fourth pressing part 264 to the thermal composite pole piece unit 200 is insufficient, thereby making the alignment of the pole piece assembly in the stacked battery cell unable to meet the requirements. When the ratio of (d3+d4) / w is greater than 1 / 30, the first pressing part 261 and the second pressing part 262 press on the thermal composite pole piece assembly to form an imprint, thereby affecting the performance of the thermal composite pole piece assembly.

[0071] refer to Figure 4 and Figure 8The connecting part of each pressing device includes a first connecting section 255 and a second connecting section 256 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 used to drive the pressing device to move in a direction perpendicular to the stacking platform 10.

[0072] When the thermal composite pole piece assembly 2 is located on the first side 141 of the stack 10, the first pressing mechanism 21 presses on the thermal composite pole piece assembly 2, and the second pressing mechanism 22 is configured to be in a lifted state, that is, the second pressing mechanism and the thermal composite pole piece assembly 2 are in a non-contact state. When the thermal composite pole piece assembly 2 is located on the second side of the stack 10, the second pressing mechanism 22 presses on the thermal composite pole piece assembly 2, and the first pressing mechanism 21 is in a lifted state, that is, the second pressing mechanism and the thermal composite pole piece assembly 2 are in a non-contact state.

[0073] According to the different positions of the thermal composite pole piece assembly 2, 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 used 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, so the first driving member 231 keeps the driving state of the first pressing device 211 and the second driving member 232 keep the driving state of the second pressing device 212 synchronous, and the third driving member 233 keeps the driving state of the third pressing device 221 and the fourth driving member 234 keeps the driving state of the fourth pressing device 222 synchronous.

[0074] The first pressing device 211 and the second pressing device 212 are configured to be in a pressing state and a lifting state synchronously, and correspondingly, the third pressing device 221 and the fourth pressing device 222 are configured to be in a lifting state and a pressing state synchronously. Specifically, when the thermal composite electrode assembly 2 is on the first side 141 of the stack, the first pressing device 211 and the second pressing device 212 are synchronously in a pressing state, and the third pressing device 221 and the fourth pressing device 222 are synchronously in a lifting state. When the thermal composite electrode assembly 2 is on the second side of the stack, the first pressing device 211 and the second pressing device 212 are synchronously in a lifting state, and the third pressing device 221 and the fourth pressing device 222 are synchronously in a pressing state.

[0075] In order to increase the moving speed of the pressing device, the pressing part is preferably 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 preferably 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 preferably configured to move in an upward direction perpendicular to the stacking platform. Therefore, the second connecting segment 256 connected to the first pressing segment 261 is preferably configured to extend in a direction parallel to one side of the stacking platform, and the first connecting segment 255 is preferably configured to extend in a direction perpendicular to the second connecting segment 256.

[0076] The driving member can be configured as a movable cylinder that can move up and down perpendicular to the stacking platform, so that the pressing device can be quickly adjusted according to the different positions of the thermal composite pole piece assembly 2.

[0077] Continue to refer Figure 4 , Figure 6 and Figure 7 The stacking device 1 also includes a first support platform 131 and a second support platform 132. The first pressing mechanism 21 is installed on the first support platform 131, and the second pressing mechanism 22 is installed on the second support platform 132. The first support platform 131 is connected to the first side 141 of the stacking platform 10, and the second support platform 132 is connected to the second side of the stacking platform 10.

[0078] refer to Figure 4 , Figure 5 as well as Figure 8 The first side 141 of the stacking platform 10 is provided with a first baffle 111, the second side of the stacking platform 10 is provided with a second baffle 112, the third side of the stacking platform 10 is provided with a third baffle 113, and the fourth side of the stacking platform 10 is provided with a fourth baffle 114. The first side 141 and the second side are arranged oppositely, and the third side and the fourth side are arranged oppositely. The first pressing mechanism 21 is located on one side of the first baffle 111, and the second pressing mechanism 22 is located on one side of the second baffle 112. The length of the first baffle 111 extending along the first set of side edges of the stacking platform 10 is less than the interval between the first pressing device 211 and the second pressing device 212, so as to avoid the first baffle 111 from interfering with the first connecting portion 251 and the second connecting portion 252, thereby affecting the first pressing device 211 and the second pressing device 212 from moving up and down in a direction perpendicular to the stacking platform 10. Correspondingly, the length of the second baffle 112 extending along the first group of side edges of the stacking platform 10 is smaller than the interval between the third pressing device 221 and the fourth pressing device 222, thereby preventing the second baffle 112 from interfering with the third connecting portion 253 and the fourth connecting portion 254 and 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 platform 10.

[0079] Continue to refer Figure 4 The lamination device further includes a driving mechanism 30 , and the driving mechanism 30 includes a driving roller assembly 31 , a supporting frame 32 and a supporting seat 33 .

[0080] The driving roller assembly 31 includes a first driving roller 311 and a second driving roller 312. The first driving roller 311 and the second driving roller 312 are both configured as cylindrical structures. During the stacking process of the thermal composite pole piece assembly 2, the thermal composite pole piece assembly 2 is clamped between the first driving roller 311 and the second driving roller 312.

[0081] The support frame 32 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 32 .

[0082] The bottom of the support frame 32 is fixed on the support seat 33 , and the support frame 32 is configured to slide left and right on the support seat 33 . Specifically, a first guide rail 34 is provided on the support seat 33 , and a sliding part that can slide on the first guide rail 34 is provided at the bottom of the support frame 32 .

[0083] In order to improve the lamination efficiency of the lamination device 1, the lamination table 10 and the drive roller assembly 31 are configured to move toward each other. In the related art, during the Z-shaped lamination of the thermal composite pole piece assembly 2, the drive roller assembly 31 is configured to reciprocate along the first guide rail 34 on the support seat 33, and the lamination table 10 is in a relatively static state. In the embodiment of the present application, the lamination table 10 is configured to move toward each other with the drive roller assembly 31. For example, the thermal composite pole piece assembly 2 moves from the first side 141 of the lamination table 10 to the second side. The drive roller assembly 31 moves along the first guide rail 34 on the support seat 33. Figure 4 The stacking platform 10 moves in the Y direction as shown, and correspondingly, moves along the second guide rail and in the direction opposite to the Y direction, thereby effectively improving the stacking efficiency.

[0084] In the related art, the stacking efficiency of the stacking device is 0.6s / sheet. The inventors have found through research that after the stacking platform 10 is configured to move toward the driving roller assembly 31, the stacking efficiency of the stacking device 1 provided in the embodiment of the present application can reach 0.1s / sheet to 0.3s / sheet, and the stacking efficiency is improved by 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, and a value between any two of the above values, or a range between any two of the above values.

[0085] refer to Figure 4 and Fig. 9 A second guide rail 12 is provided at the bottom of the stacking platform 10, and the stacking platform 10 is configured to slide along the second guide rail 12. The second guide rail 12 is located between the first pressing mechanism 21 and the second pressing mechanism 22.

[0086] When the driving roller assembly 31 drives the thermal composite pole piece assembly 2 to move from the first side 141 of the stacking platform 10 toward the second side close to the stacking platform 10 along the first guide rail 34, the stacking platform 10 is configured to move in the opposite direction along the second guide rail 12. In a preferred embodiment, the extension length of the first guide rail 34 is greater than the extension length of the second guide rail 12. Since the driving roller assembly 31 is used to drive the thermal composite pole piece assembly 2 to move, the thermal composite pole piece assembly 2 is configured to move from the first side 141 of the stacking platform 10 to the second side of the stacking platform 10, and thus the length of the first guide rail 34 is preferably set to be greater than the length of the stacking platform 10, and the second guide rail 12 is configured for the stacking platform 10 to move, such as Fig. 9 As shown, the second guide rail 12 is located at the bottom of the stack 10, and the length of the second guide rail 12 is less than the length of the stack 10, so the length of the first guide rail 34 is greater than the length of the second guide rail 12, so as to effectively control the thermal composite pole piece assembly 2 to swing back and forth between the first side 141 and the second side of the stack 10.

[0087] Continue to refer Figure 4 and Fig. 9 The stacking device 1 further includes a first deflection correction sensor 41 and a second deflection correction sensor 42. The first deflection correction sensor 41 is located on one side of the first pressing mechanism 21, and the second deflection correction sensor 42 is located on one side of the second pressing mechanism 22. The first deflection correction sensor 41 and the second deflection correction sensor 42 are both located in the gap between the driving mechanism 30 and the stacking platform 10.

[0088] By adding the first deflection correction sensor 41 and the second deflection correction sensor 42 in the gap between the driving mechanism 30 and the stacking platform 10, the first deflection correction sensor 41 and the second deflection correction sensor 42 can capture the entire stacking process of the thermal composite pole piece assembly 2 during the stacking process of the thermal composite pole piece assembly 2. Furthermore, the first deflection correction sensor 41 is located on one side of the first pressing mechanism 21, and the second deflection correction sensor 42 is located on one side of the second pressing mechanism 22. Therefore, the first deflection correction sensor 41 can capture the pressing action provided by the first pressing mechanism 21 to the thermal composite pole piece assembly 2, and the second deflection correction sensor 42 can capture the pressing action provided by the second pressing mechanism 22 to the thermal composite pole piece assembly 2, thereby preventing the first pressing mechanism 21 and the second pressing mechanism 22 from performing erroneous operations on the thermal composite pole piece assembly 2.

[0089] An embodiment of the present application further provides a thermal composite device, which includes the above-mentioned lamination device and a hot rolling composite device, and the hot rolling composite device is used to hot roll the positive electrode sheet, the separator and the negative electrode sheet to form a hot composite unit to provide a lamination device.

[0090] Among them, the stacking device includes a pressing mechanism, which can provide constant tension to the thermal composite pole piece assembly located on the stacking platform, so that the thermal composite pole piece assembly is in a constant tension state, thereby effectively improving the alignment of the pole piece assembly in the stacked battery cell.

[0091] Compared with the Z-shaped lamination method in the related art, the negative electrode sheet unloading device, the diaphragm unwinding device and the positive electrode sheet unloading device are sequentially arranged on the lamination table, and the diaphragm swings back and forth on the lamination table, thereby limiting the lamination efficiency. In the thermal composite device provided in the present application, the positive electrode sheet, the diaphragm and the negative electrode sheet are first hot-rolled by a hot rolling composite device to form a hot composite unit and then provided to the lamination device. The driving mechanism and the lamination table in the lamination device can be configured to move toward each other, thereby effectively improving the lamination efficiency.

[0092] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for technicians in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A lamination device, characterized in that: include: A stacking platform, used for stacking multiple thermal composite pole piece units; At least one pressing mechanism, the pressing mechanism includes a first pressing mechanism arranged on the first side of the stack, the first pressing mechanism includes a first pressing device and a second pressing device arranged opposite to each other, the interval between the first pressing device and the second pressing device is greater than or equal to the width of the thermal composite pole piece unit, so that the first pressing device presses on one side of the thermal composite pole piece unit, and the second pressing device presses on the other side of the thermal composite pole piece unit, wherein one side of the thermal composite pole piece unit is arranged opposite to the other side of the thermal composite pole piece unit, and the interval between one side of the thermal composite pole piece unit and the other side of the thermal composite pole piece unit is set to the width of the thermal composite pole piece unit.

2. The lamination device according to claim 1, characterized in that: The interval between the first pressing device and the second pressing device is set to 100 mm to 600 mm.

3. The lamination device according to claim 1, characterized in that: At least one of the pressing mechanisms further comprises a second pressing mechanism disposed on the second side of the stack, the second pressing mechanism comprising a third pressing device and a fourth pressing device disposed opposite to each other, the interval between the third pressing device and the fourth pressing device being equal to the width of the thermal composite electrode unit, and the first side and the second side being disposed opposite to each other; When the thermal composite pole piece unit is located on the first side of the stack, the first pressing mechanism is used to press the thermal composite pole piece unit; when the thermal composite pole piece unit is located on the second side of the stack, the second pressing mechanism is used to press the thermal composite pole piece unit.

4. The lamination device according to claim 3, characterized in that: The first pressing device, the second pressing device, the third pressing device and the fourth pressing device 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 connected to the connecting portion, the driving member is used to drive the pressing portion to move toward or away from the stack, and the extending direction of the pressing portion is configured to be the same as the width direction of the thermal composite electrode unit; The first pressing device includes a first pressing member, the first pressing member includes a first pressing portion, the second pressing device includes a second pressing member, the second pressing member includes a second pressing portion, and the first pressing portion and the second pressing portion have opposite extension directions; and / or the third pressing device includes a third pressing portion, the fourth pressing device includes a fourth pressing portion, and the third pressing portion and the fourth pressing portion have opposite extension directions.

5. The lamination device according to claim 4, characterized in that: The first pressing portion extends along the width direction of the thermal composite electrode piece by a length d1, the second pressing portion extends along the width direction of the thermal composite electrode piece by a length d2, the width of the thermal composite electrode piece unit is w, (d1+d2) / w satisfies: 1 / 40≤(d1+d2) / w≤1 / 30; and / or, The length of the third pressing portion extending along the width direction of the thermal composite electrode is d3, the length of the fourth pressing portion extending along the width direction of the thermal composite electrode is d4, the width of the thermal composite electrode unit is w, and (d3+d4) / w satisfies: 1 / 40≤(d3+d4) / w≤1 / 30.

6. The lamination device according to claim 3, characterized in that: The stacking device includes a first baffle located on one side of the stacking platform, and a second baffle located on the other side of the stacking platform; the first pressing mechanism is located on one side of the first baffle, and the second pressing mechanism is located on one side of the second baffle; the length of the first baffle extending along another set of side edges of the stacking platform is less than the interval between the first pressing device and the second pressing device; and / or the length of the second baffle extending along another set of side edges of the stacking platform is less than the interval between the third pressing device and the fourth pressing device.

7. The lamination device according to claim 3, characterized in that: The lamination device further comprises a driving mechanism, which is disposed on the lamination platform. The driving mechanism comprises a driving roller assembly, which is used to drive the thermal composite pole piece unit. The driving roller assembly and the lamination platform are configured to move toward each other.

8. The lamination device according to claim 7, characterized in that: The driving mechanism comprises a first guide rail for moving the driving roller assembly, and the stacking device further comprises a second guide rail for moving the stacking platform, wherein an extension length of the first guide rail is greater than an extension length of the second guide rail.

9. The lamination device according to claim 7 or 8, characterized in that: The stacking device also includes a first skew correction sensor and a second skew correction sensor, both of which are located in the gap between the driving mechanism and the stacking platform, the first skew correction sensor is located on one side of the first pressing mechanism, and the second skew correction sensor is located on one side of the second pressing mechanism.

10. A thermal composite device, characterized in that: The thermal composite equipment comprises the lamination device according to any one of claims 1 to 9 and a hot rolling composite device, wherein the hot rolling composite device is used to hot roll the positive electrode sheet, the separator and the negative electrode sheet to form a hot composite unit and then provide it to the lamination device.

Images