A high-speed lamination method for lithium-ion batteries, a lamination device and a lithium-ion battery

Abstract

The present invention relates to the field of battery manufacturing technology, and specifically discloses a high-speed lamination method for lithium-ion batteries, a lamination device and a lithium-ion battery, wherein the high-speed lamination method for lithium-ion batteries comprises the following steps: step S100, providing a diaphragm roll, unwinding the diaphragm on the diaphragm roll onto a conveyor belt; step S200, placing N groups of positive electrode sheet assemblies and N groups of negative electrode sheet assemblies on the diaphragm at intervals, each group of positive electrode sheet assemblies comprising M spaced positive electrode sheets, and each group of negative electrode sheet assemblies comprising M spaced negative electrode sheets, wherein both M and N are not less than 2; step S300, hot-pressing and bonding the positive electrode sheet and the negative electrode sheet to the diaphragm; step S400, winding the diaphragm with the positive electrode sheet and the negative electrode sheet placed thereon to form a winding core; step S500, hot-pressing the winding core; step S600, cutting the hot-pressed winding core to form M battery cell blanks. The high-speed lamination method for lithium-ion batteries of the present invention is simple to operate and has high production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of battery manufacturing, and in particular to a high-speed lamination method for lithium-ion batteries, a lamination device and a lithium-ion battery. Background Art

[0002] At present, lithium-ion batteries are widely used in consumer electronics, new energy vehicles and energy storage fields. With the rapid development of the application market and the continuous improvement of users' requirements for products, how to produce lithium-ion batteries with good safety performance, high specific energy, long cycle life and low cost has become an important research direction in the field of lithium-ion batteries.

[0003] Lithium-ion batteries can be divided into two types according to their production methods: wound type and stacked type. Wound batteries have fast processing speed and high efficiency, but they have the following defects: 1. Wound batteries have certain requirements for the flexibility of the pole pieces, resulting in low pole piece surface density and restricted energy density of single cells; 2. The reaction of wound batteries at the bend of the pole piece is different from that at other positions, and the electrode reaction uniformity is poor, which affects performance and even poses a safety hazard; 3. In order to make the negative electrode completely wrap the positive electrode, there is a part of invalid area in the negative electrode sheet of the wound battery, which does not provide capacity and reduces the energy density of the battery. In comparison, the electrode reaction uniformity of stacked batteries is better and safer, and the pole piece can be coated thicker, thereby improving the energy density of the battery.

[0004] At present, there are mainly the following stacking methods for stacked batteries:

[0005] 1. Z-type lamination: the pre-cut positive and negative electrode sheets and separators are stacked in a Z-shape from bottom to top. This process is simple, but it has the problems of slow lamination speed and low efficiency, which prolongs the production cycle and increases the production cost.

[0006] 2. Bag-type lamination, which involves encapsulating the pre-cut positive and negative electrode sheets in diaphragm bags respectively, and then stacking them alternately to form a stack. However, this process is complicated, requires the production of diaphragm bags, and has low production efficiency;

[0007] 3. H-type lamination: This process is similar to Z-type lamination, except that the positive and negative electrodes have tabs on both sides or the positive and negative electrodes have two tabs on one side of the battery cell. This process can effectively solve the problem of excessive thickness of the tab welding area caused by too many lamination layers, but the lamination speed is still low. Summary of the invention

[0008] An object of an embodiment of the present invention is to provide a high-speed stacking method for lithium-ion batteries, which has simple operation, fast stacking speed and high production efficiency.

[0009] Another object of an embodiment of the present invention is to provide a lamination device with a simple structure, which can effectively simplify the lamination process and improve production efficiency.

[0010] Another object of the embodiments of the present invention is to provide a lithium-ion battery.

[0011] To achieve this purpose, the embodiment of the present invention adopts the following technical solutions:

[0012] In a first aspect, a high-speed stacking method for lithium-ion batteries is provided, comprising the following steps:

[0013] Step S100, providing a diaphragm roll, and unwinding the diaphragm on the diaphragm roll onto a conveyor belt;

[0014] Step S200, placing N groups of positive electrode sheet assemblies and N groups of negative electrode sheet assemblies on the diaphragm at intervals, each group of the positive electrode sheet assemblies includes M positive electrode sheets arranged at intervals, and each group of the negative electrode sheet assemblies includes M negative electrode sheets arranged at intervals, wherein both M and N are not less than 2;

[0015] Step S300, hot-pressing and bonding the positive electrode sheet, the negative electrode sheet and the separator;

[0016] Step S400, winding the separator with the positive electrode sheet and the negative electrode sheet placed thereon to form a winding core;

[0017] Step S500, hot pressing the core;

[0018] Step S600: cutting the hot-pressed core into M battery cell bodies.

[0019] As a preferred solution of the high-speed lamination method for lithium-ion batteries, in the step S300, the positive electrode sheet and the negative electrode sheet are hot-pressed using a hot pressing roller.

[0020] As a preferred solution for a high-speed stacking method for lithium-ion batteries, the outer periphery of the hot pressing roller is evenly distributed with a plurality of hot pressing protrusions along the circumferential direction, the hot pressing protrusions having an arc surface that fits with a side of the pole piece away from the diaphragm, and isolation grooves are provided between adjacent hot pressing protrusions. When the hot pressing roller rotates, each of the hot pressing protrusions can selectively fit with the pole piece.

[0021] As a preferred solution of the high-speed stacking method for lithium-ion batteries, before the core is hot-pressed, the core is bundled with a binding tape; after the core is hot-pressed, the binding tape is released.

[0022] As a preferred solution of the high-speed stacking method for lithium-ion batteries, hot pressing direction lines are drawn on the surface of the bundled winding core.

[0023] As a preferred solution of the high-speed lamination method for lithium-ion batteries, when the core is cut after hot pressing, a laser mechanism is used to cut the core.

[0024] As a preferred solution of the high-speed lamination method for lithium-ion batteries, before slitting the hot-pressed core, a slitting mark line is pre-drawn on the periphery of the core.

[0025] In a second aspect, a high-speed stacking device for lithium-ion batteries is provided, comprising:

[0026] A diaphragm feeding mechanism, comprising a feeding roller, a tensioning roller and a conveyor belt, wherein the feeding roller is used to support a diaphragm roll, the tensioning roller is used to tension the diaphragm, the conveyor belt has a first end and a second end that are arranged oppositely, the feeding roller and the tensioning roller are adjacent to the first end, and the diaphragm on the diaphragm roll is laid on the conveyor belt and can move with the conveyor belt;

[0027] An electrode sheet feeding mechanism is arranged at a distance from the conveyor belt, and is located between the first end and the second end, and is used for conveying the die-cut positive electrode sheet and negative electrode sheet to the diaphragm located on the conveyor belt;

[0028] A first hot pressing mechanism, disposed above the conveyor belt and between the electrode feeding mechanism and the second end;

[0029] A winding mechanism, disposed at the second end, for winding the separator with the positive electrode sheet and the negative electrode sheet laid thereon to form a winding core;

[0030] A second hot pressing mechanism, disposed on a side of the winding mechanism away from the conveyor belt, for hot pressing the winding core;

[0031] The slitting mechanism is arranged on a side of the second hot pressing mechanism away from the winding mechanism, and is used for slitting the hot pressed winding core into at least two battery cell blanks.

[0032] As a preferred solution for a high-speed stacking device for lithium-ion batteries, the winding mechanism includes a winding shaft and a first driving mechanism that drives the winding shaft to rotate, and a core unloading mechanism is also arranged between the winding mechanism and the second hot pressing mechanism. The core unloading mechanism includes an upper clamping jaw and a lower clamping jaw arranged at intervals in the vertical direction, and an intermediate unloading tray is arranged between the upper clamping jaw and the lower clamping jaw, and the intermediate unloading tray can be inserted into the middle of the core.

[0033] In a third aspect, a lithium-ion battery is provided, which is manufactured and formed using the lithium-ion battery high-speed lamination method.

[0034] The beneficial effects of the embodiments of the present invention are as follows: by winding the diaphragm with the pole pieces, multiple pole pieces can be laid at one time, and by winding and hot pressing and then cutting, multiple battery cell blanks can be formed at one time, which greatly improves the production efficiency. At the same time, this lamination method will not affect the entire front and back processes of lithium-ion battery production, is easy to replace traditional processes, and has low production costs. By performing hot pressing separately after the pole pieces are placed, the degree of fit between the pole pieces and the diaphragm is higher, the positional displacement of the pole pieces is completely eliminated, and the accuracy of the entire manufacturing process is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention is further described in detail below based on the accompanying drawings and embodiments.

[0036] Figure 1 Schematic diagram of the structure principle of a high-speed stacking device for lithium-ion batteries according to an embodiment of the present invention.

[0037] Figure 2 It is a schematic diagram of the structural principle of the diaphragm feeding mechanism according to an embodiment of the present invention.

[0038] Figure 3 Schematic diagram of the hot pressing and winding process of the diaphragm and the pole piece according to an embodiment of the present invention.

[0039] Figure 4 Schematic diagram of the structural principle of the electrode feeding mechanism according to an embodiment of the present invention.

[0040] Figure 5 It is a schematic diagram of the process of hot pressing an electrode sheet and a diaphragm by a first hot pressing mechanism according to an embodiment of the present invention.

[0041] Figure 6 Schematic diagram of the structural principle of the core unloading mechanism of an embodiment of the present invention.

[0042] Figure 7 Schematic diagram of the structural principle of the second hot pressing mechanism of an embodiment of the present invention.

[0043] Figure 8 It is a schematic diagram of the structure of the winding core after winding and forming according to an embodiment of the present invention.

[0044] Fig. 9 Schematic diagram of the structure of the core after hot pressing according to an embodiment of the present invention.

[0045] Fig.10 It is a schematic diagram of the structure after the core is cut into battery cell bodies according to an embodiment of the present invention.

[0046] In the figure:

[0047] 1. Diaphragm feeding mechanism; 101. Feeding roller; 102. Tensioning roller; 103. Conveyor belt; 104. Driving wheel; 105. Driven wheel;

[0048] 2. Pole piece feeding mechanism; 201. Linear moving module; 202. Driving cylinder; 203. Suction cup seat; 204. Suction cup; 205. Pole piece feeding box; 206. Positioning plate; 207. Positioning camera;

[0049] 3. First hot pressing mechanism; 301. Hot pressing roller; 3011. Hot pressing convex part; 3012. Arc surface; 3013. Isolation groove;

[0050] 4. Winding mechanism; 401. Winding shaft; 402. Rotating disk; 403. Support assembly;

[0051] 5. Second hot pressing mechanism; 501. First hot pressing plate; 502. Second hot pressing plate;

[0052] 6. Cutting mechanism;

[0053] 7. Roll core unloading mechanism; 701. Upper clamping claw; 702. Lower clamping claw; 703. Unloading intermediate tray; 704. Unloading rack;

[0054] 8. Diaphragm roll; 801. Diaphragm; 9. Positive electrode sheet; 10. Negative electrode sheet; 11. Roll core; 12. Battery cell body. DETAILED DESCRIPTION

[0055] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0056] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0058] like Figures 1 to 10 As shown, an embodiment of the present invention provides a high-speed stacking method for lithium-ion batteries, comprising the following steps:

[0059] Step S100, providing a diaphragm roll 8, and unwinding the diaphragm 801 on the diaphragm roll 8 onto the conveyor belt 103;

[0060] Step S200, N groups of positive electrode sheet assemblies and N groups of negative electrode sheet assemblies are placed on the separator 801 at intervals, each group of the positive electrode sheet assemblies includes M positive electrode sheets 9 arranged at intervals, and each group of the negative electrode sheet assemblies includes M negative electrode sheets 10 arranged at intervals, wherein both M and N are not less than 2;

[0061] Step S300, thermally pressing the positive electrode sheet 9 and the negative electrode sheet 10 to bond with the separator 801;

[0062] Step S400, winding the separator 801 with the positive electrode sheet 9 and the negative electrode sheet 10 placed thereon to form a winding core 11;

[0063] Step S500, hot pressing the winding core 11;

[0064] Step S600 , cutting the hot-pressed winding core 11 into M battery cell bodies 12 .

[0065] By winding the diaphragm 801 with the pole pieces, multiple pole pieces can be laid at one time, and after winding and hot pressing, they are cut and multiple battery cell blanks 12 can be formed at one time, which greatly improves the production efficiency. At the same time, this stacking method will not affect the entire front and back processes of lithium-ion battery production, it is easy to replace traditional processes, and the production cost is low. By hot pressing once after the pole pieces are placed, the degree of fit between the pole pieces and the diaphragm 801 is higher, the position deviation of the pole pieces is completely eliminated, and the accuracy of the entire manufacturing process is improved.

[0066] In one embodiment, in step S300, the positive electrode sheet 9 and the negative electrode sheet 10 are hot pressed using a hot pressing roller 301. The rolling hot pressing roller 301 can reduce the friction with the positive electrode sheet 9 and the negative electrode sheet 10, and prevent the positive electrode sheet 9 and the negative electrode sheet 10 from being driven to shift during hot pressing.

[0067] In this embodiment, refer to Figure 5 The outer periphery of the hot pressing roller 301 is evenly distributed with a number of hot pressing protrusions 3011 along the circumferential direction. The hot pressing protrusions 3011 have an arc surface 3012 that fits with the side of the pole piece away from the diaphragm 801. There are separation grooves 3013 between adjacent hot pressing protrusions 3011. When the hot pressing roller 301 rotates, each of the hot pressing protrusions 3011 can selectively fit with the pole piece. The hot pressing protrusions 3011 arranged at intervals can only press against one pole piece when the hot pressing roller 301 rotates. The separation grooves 3013 can increase the gap between the hot pressing roller 301 and the diaphragm 801 when the hot pressing roller 301 rotates between two adjacent pole pieces, thereby preventing the hot pressing roller 301 from directly contacting the diaphragm 801.

[0068] In one embodiment, before the core 11 is hot-pressed, the core 11 is tied with a binding tape; after the core 11 is hot-pressed, the binding tape is released. The binding tape can effectively prevent the core 11 from loosening before hot-pressing, thereby preventing the pole piece from shifting.

[0069] In this embodiment, hot pressing direction lines are drawn on the surface of the bundled winding core 11. By drawing the hot pressing direction lines, subsequent hot pressing can be guided to prevent damage to the pole piece caused by wrong hot pressing direction.

[0070] In one embodiment, when the core 11 after hot pressing is cut, a laser mechanism (ie, the cutting mechanism 6 ) is used to cut the core 11 .

[0071] In this embodiment, before the hot-pressed winding core 11 is cut, cutting marking lines are pre-drawn on the outer circumference of the winding core 11. The cutting marking lines can accurately indicate the cutting position, ensure the accuracy of the cutting position, and make the cut and formed battery cell blank 12 have a high yield.

[0072] The present invention also provides a high-speed stacking device for lithium-ion batteries, referring to Figures 1 to 10The high-speed stacking device for ion batteries includes a diaphragm feeding mechanism 1, a pole piece feeding mechanism 2, a first hot pressing mechanism 3, a winding mechanism 4, a second hot pressing mechanism 5 and a slitting mechanism 6, wherein the diaphragm feeding mechanism 1 includes a feeding roller 101, a tensioning roller 102 and a conveyor belt 103, the feeding roller 101 is used to support the diaphragm roll 8, the tensioning roller 102 is used to tension the diaphragm 801, the conveyor belt 103 has a first end and a second end arranged oppositely, the feeding roller 101 and the tensioning roller 102 are adjacent to the first end, the diaphragm 801 on the diaphragm roll 8 is laid on the conveyor belt 103, and can move with the conveyor belt 103; the pole piece feeding mechanism 2 is spaced apart from the conveyor belt 103, and the pole piece feeding mechanism 2 is located between the first end and the second end, and is used to convey the die-cut positive electrode sheet 9 and the negative electrode sheet 10 to the diaphragm 801 located on the conveyor belt 103; the first hot pressing mechanism 3 is arranged above the conveyor belt 103 and is located between the electrode sheet feeding mechanism 2 and the second end; the winding mechanism 4 is arranged at the second end, and is used to wind the diaphragm 801 with the positive electrode sheet 9 and the negative electrode sheet 10 laid thereon to form a winding core 11; the second hot pressing mechanism 5 is arranged on the side of the winding mechanism 4 away from the conveyor belt 103, and is used to hot press the winding core 11; the slitting mechanism 6 is arranged on the side of the second hot pressing mechanism 5 away from the winding mechanism 4, and is used to slit the hot-pressed winding core 11 into at least two battery cell blanks 12. By setting up a conveyor belt 103 to transport the diaphragm 801, a plurality of groups of positive electrode sheet assemblies and a plurality of groups of negative electrode sheet assemblies can be arranged on the diaphragm 801 at intervals by using the electrode sheet loading mechanism 2 while the diaphragm 801 is being transported. Each group of positive electrode sheet assemblies and each group of negative electrode sheet assemblies respectively contain a plurality of positive electrode sheets 9 and a plurality of negative electrode sheets 10, so that a plurality of electrode sheets can be laid at one time. The winding mechanism 4 can be set up to wind the diaphragm 801 with the electrode sheets laid thereon to form a winding core 11, which is then cut after hot pressing by the second hot pressing mechanism 5. The cutting mechanism 6 can directly cut the winding core 11 into at least two battery cell blanks 12, thereby greatly improving the production efficiency. By setting up the first hot pressing mechanism 3, the electrode sheets can be hot pressed one by one with the diaphragm 801 before winding, so as to increase the tightness of the electrode sheets and the diaphragm 801 and prevent the position of the electrode sheets from shifting.

[0073] Specifically, refer to Figure 2The diaphragm feeding mechanism 1 also includes a driving wheel 104 and a driven wheel 105. The conveyor belt 103 is sleeved on the driving wheel 104 and the driven wheel 105 arranged at intervals. The output shaft end of the driving motor is connected to the driving wheel 104 in a transmission manner to drive the driving wheel 104 to rotate, and then the driving wheel 104 drives the conveyor belt 103 to move according to the set trajectory to realize the transportation of the diaphragm 801. The conveyor belt 103 can not only transport the diaphragm 801, but also pull the diaphragm 801 to unwind the diaphragm roll 8, so that the diaphragm 801 is continuously laid on the conveyor belt 103 while moving, which can realize uninterrupted production and improve production efficiency. At the same time, the conveyor belt 103 can also support the diaphragm 801. After the pole piece is placed, it can also provide a supporting force for the hot pressing of the first hot pressing mechanism 3 to ensure that the pole piece and the diaphragm 801 can fit tightly.

[0074] In one embodiment, referring to Figure 6 The winding mechanism 4 includes a winding shaft 401 and a first driving mechanism that drives the winding shaft 401 to rotate. A core unloading mechanism 7 is also provided between the winding mechanism 4 and the second hot pressing mechanism 5. The core unloading mechanism 7 includes an upper clamping claw 701 and a lower clamping claw 702 that are spaced apart in the vertical direction. An unloading intermediate tray 703 is provided between the upper clamping claw 701 and the lower clamping claw 702. The unloading intermediate tray 703 can be inserted into the middle of the core 11. By providing the unloading intermediate tray 703, the unloading intermediate tray 703 can be inserted into the hole in the middle of the core 11. When the second hot pressing mechanism 5 performs hot pressing on the core 11, adhesion in the hole in the middle of the core 11 can be effectively prevented, so as to facilitate the subsequent separation of the battery cell blank 12. In the present invention, the battery cell body 12 refers to a structure consisting of a positive electrode sheet 9, a negative electrode sheet 10 and a diaphragm 801. Specifically, the diaphragm 801 is provided with multiple layers, and a pole sheet is arranged between two adjacent layers of diaphragms 801. The polarities of the two adjacent pole sheets are different, that is, the positive electrode sheet 9 and the negative electrode sheet 10 are alternately arranged in the diaphragm layer stacked by several diaphragms 801.

[0075] Specifically, the winding shaft 401 has a rectangular cross section. The rectangular winding shaft 401 can enable the diaphragm 801 and the pole piece to form a structure with a cross section similar to a rectangle when winding, which is convenient for subsequent hot pressing and slitting.

[0076] The winding mechanism 4 also includes a rotating disk 402, a rotating shaft (not shown in the figure) is arranged at the center of the rotating disk 402, and the rotating shaft is connected to a rotating shaft driving mechanism (not shown in the figure), and the rotating shaft driving mechanism can drive the rotating shaft and the rotating disk 402 to rotate around the axis of the rotating shaft, and at least two winding assemblies are arranged in an annular manner on one side of the rotating disk 402 close to the conveyor belt 103, and the winding assembly includes a driving motor and the winding shaft 401 arranged at the output shaft end of the driving motor, and the driving motor is connected to the rotating disk 402 through an elastic connecting member (not shown in the figure), and the elastic connecting member always has a movement tendency to drive the winding shaft 401 to move toward the conveyor belt 103. The setting of the rotating disk 402 can realize the switching of at least two winding shafts 401 positions, thereby meeting the uninterrupted winding work; by setting the elastic connecting member, the driving motor driving the winding shaft 401 can be pressed toward the conveyor belt 103, so that the winding shaft 401 can smoothly wind the diaphragm 801 on the conveyor belt 103.

[0077] Furthermore, the winding mechanism 4 also includes a support assembly 403, the support assembly 403 includes a base, the base and the rotating disk 402 are respectively located on both sides of the conveyor belt 103, a connecting seat is provided on the base, a supporting portion movable in the horizontal direction is provided on the connecting seat, the supporting portion selectively supports the side of the winding shaft 401 away from the driving motor, and the elastic connecting member is provided between the connecting seat and the base. By providing the support assembly 403, the other end of the winding shaft 401 can be supported to ensure that the axis of the winding shaft 401 is always parallel to the conveyor belt 103; by providing the supporting portion movable in the horizontal direction, the supporting portion can be selected to support the winding shaft 401, or the supporting portion can be separated from the winding shaft 401, and the rotating disk 402 can rotate to switch the winding shaft 401 that is not wound with the diaphragm 801 and the pole piece.

[0078] The core unloading mechanism 7 also includes a unloading frame 704, on which a circle of conveying chain (not shown in the figure) is arranged in an annular manner, and a plurality of unloading intermediate trays 703 are arranged at intervals on the conveying chain. The upper clamping claw 701 and the lower clamping claw 702 are arranged on one side of the unloading frame 704 close to the rotating disk 402. Under the action of the rotating transmission chain, the unloading intermediate tray 703 can selectively move between the upper clamping claw 701 and the lower clamping claw 702 to receive the core 11 from the rotating disk 402.

[0079] Furthermore, the unloading intermediate tray 703 is installed on the transmission chain through a rotating motor, and the output shaft end of the rotating motor is connected to one end of the unloading intermediate tray 703, and the other end of the unloading intermediate tray 703 is suspended. The cross-section of the unloading intermediate tray 703 is rectangular, and its size is slightly smaller than that of the winding shaft 401. Driven by the rotating motor, the unloading intermediate tray 703 can rotate along the output axis of the rotating motor to achieve switching between horizontal and vertical directions. When the unloading intermediate tray 703 moves between the upper clamping claw 701 and the lower clamping claw 702, the unloading intermediate tray 703 is in a horizontal state. The unloading intermediate tray 703 maintains the horizontal state and moves to the second hot pressing mechanism 5 for hot pressing, which is convenient for hot pressing operation. When the unloading intermediate tray 703 moves to the slitting mechanism 6, in order to facilitate slitting, the rotating motor drives the unloading intermediate tray 703 to rotate 90 degrees.

[0080] Reference Figure 7 The second hot pressing mechanism 5 includes a first hot pressing plate 501 and a second hot pressing plate 502 arranged in parallel. The first hot pressing plate 501 and the second hot pressing plate 502 are both parallel to the horizontal plane. The two can approach each other or move away from each other under the drive of the power mechanism. When the first hot pressing plate 501 and the second hot pressing plate 502 are close to each other, the core 11 can be hot pressed. Optionally, the first hot pressing plate 501 and the second hot pressing plate 502 can be driven by cylinders to achieve vertical movement. In other embodiments, a combination structure of a motor and a transmission mechanism can also be used to drive the two hot pressing plates to move in the vertical direction. The driving structure is not limited as long as the relative movement of the two hot pressing plates can be achieved to approach and move away, and the requirements of hot pressing can be met.

[0081] In one embodiment, two electrode sheet feeding mechanisms 2 are provided, and the two electrode sheet feeding mechanisms 2 are respectively arranged on both sides of the conveyor belt 103, wherein one electrode sheet feeding mechanism 2 is used to feed the positive electrode sheet 9, and the other electrode sheet feeding mechanism 2 is used to feed the negative electrode sheet 10. The positive electrode sheet 9 and the negative electrode sheet 10 are fed separately, which can increase the feeding speed.

[0082] In this embodiment, the electrode loading mechanism 2 includes a linear moving module 201, a driving cylinder 202, a suction cup 204, a electrode loading box 205, a positioning plate 206 and a positioning camera 207. The driving cylinder 202 is arranged on the slide of the linear moving module 201. The piston rod end of the driving cylinder 202 is provided with a suction cup seat 203. The driving cylinder 202 can drive the suction cup seat 203 to move in the vertical direction. At least two suction cups 204 are arranged on the suction cup seat 203 (the number and position of the suction cups 204 on the suction cup seat 203 correspond to the number and spacing of the positive electrode sheets 9). The suction cup 204 is connected to a solenoid valve, and the solenoid valve is electrically connected to the controller. To drive the suction cup 204 to selectively adsorb the electrode, a plurality of the positive electrode sheets 9 or the negative electrode sheets 10 are stored in the electrode loading box 205, the electrode loading box 205 is arranged on one side of the conveyor belt 103, the positioning plate 206 is arranged between the electrode loading box 205 and the conveyor belt 103, and the spacing between the positioning plate 206 and the electrode loading box 205, and the spacing between the positioning plate 206 and the conveyor belt 103 is equal, the positioning camera 207 is fixed on the linear moving module 201, and the position of the positioning camera 207 is opposite to the position of the positioning plate 206, and the linear moving module 201 and the positioning camera 207 are both electrically connected to the controller. By setting the positioning plate 206 and the positioning camera 207, the position of the electrode can be adjusted when the suction cup 204 sucks the electrode out of the electrode loading box 205. After the position of the electrode is adjusted, it is adsorbed onto the conveyor belt 103 by the suction cup 204, so that the position of the electrode on the diaphragm 801 of the conveyor belt 103 can be accurate.

[0083] In one embodiment, the hot pressing roller 301 of the first hot pressing mechanism 3 is driven by a second driving mechanism to realize the hot pressing roller 301 rotating around its own axis to realize hot pressing. The axis of the hot pressing roller 301 is parallel to the conveyor belt 103 and perpendicular to the conveying direction of the electrode. The second driving mechanism is electrically connected to the controller.

[0084] The high-speed stacking method and device for lithium-ion batteries of the embodiment of the present invention can form at least two battery cell blanks 12 at one time. When two battery cell blanks 12 need to be formed at one time, one of the electrode sheet feeding mechanisms 2 feeds two positive electrode sheets 9 at the same time each time, and the other electrode sheet feeding mechanism 2 feeds two negative electrode sheets 10 at the same time each time. When the winding mechanism 4 is winding, the cross-section of the winding shaft 401 is rectangular, and the positive electrode sheets 9 and the negative electrode sheets 10 are stacked in sequence on the opposite sides of the winding shaft 401 (refer to the figure), while the other two sides of the winding shaft 401 only have stacked diaphragms 801. During cutting, the cutting mechanism 6 cuts the side with only the diaphragm 801 to cut the core 11 into two battery cell blanks 12. The present solution can also form three or more battery cell blanks 12 at one time. When the above number of battery cell blanks 12 need to be formed, the number of positive electrode sheets 9 or negative electrode sheets 10 fed by the electrode sheet feeding mechanism 2 at one time is adjusted according to the number of battery cell blanks 12 required, or the number of positive electrode sheets 9 or negative electrode sheets 10 contained in the positive electrode sheet assembly and the negative electrode sheet assembly is adjusted, and the method of multiple feeding is selected. The shapes of the winding shaft 401 and the unloading intermediate tray 703 are adjusted according to the number of battery cell blanks 12 that need to be formed at one time, and the unloading The angle at which the intermediate tray 703 rotates when it moves to the slitting mechanism 6. For example, when three battery cell blanks 12 need to be formed at one time, the cross-sectional shape of the winding shaft 401 and the intermediate tray 703 for unloading is an equilateral triangle, and the angle at which the intermediate tray 703 rotates when it moves to the slitting mechanism 6 is 60 degrees; when four battery cell blanks 12 need to be formed at one time, the cross-sectional shape of the winding shaft 401 and the intermediate tray 703 for unloading is a square, and the angle at which the intermediate tray 703 rotates when it moves to the slitting mechanism 6 is 45 degrees, etc.

[0085] An embodiment of the present invention further provides a lithium-ion battery, which is manufactured by using the lithium-ion battery high-speed stacking method of any of the above embodiments or the lithium-ion battery high-speed stacking device of any of the above embodiments.

[0086] In the description herein, it should be understood that the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0087] In the description of this specification, the description with reference to the terms "an embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0088] In addition, it should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0089] The technical principle of the present invention is described above in conjunction with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations herein, those skilled in the art can associate other specific implementations of the present invention without paying creative labor, and these methods will fall within the scope of protection of the present invention.

Claims

1. A high-speed lamination method for lithium-ion batteries, characterized in that: The following steps are involved: Step S100, providing a diaphragm roll, and unwinding the diaphragm on the diaphragm roll onto a conveyor belt; Step S200, placing N groups of positive electrode sheet assemblies and N groups of negative electrode sheet assemblies on the diaphragm at intervals, each group of the positive electrode sheet assemblies includes M positive electrode sheets arranged at intervals, and each group of the negative electrode sheet assemblies includes M negative electrode sheets arranged at intervals, wherein both M and N are not less than 2; Step S300, hot-pressing and bonding the positive electrode sheet, the negative electrode sheet and the separator; Step S400, winding the separator with the positive electrode sheet and the negative electrode sheet placed thereon to form a winding core; Step S500, hot pressing the core; Step S600, pre-drawing a slitting mark line on the outer periphery of the core, and slitting the core after hot pressing to form M battery cell bodies; In the step S300, the positive electrode sheet and the negative electrode sheet are hot pressed using a hot pressing roller; The outer periphery of the hot pressing roller is evenly distributed with a plurality of hot pressing protrusions along the circumferential direction, and the hot pressing protrusions have an arc surface that fits with a side of the pole piece away from the diaphragm, and there are isolation grooves between adjacent hot pressing protrusions. When the hot pressing roller rotates, each of the hot pressing protrusions can selectively fit with the pole piece; The isolation groove can increase the gap between the heat pressing roller and the diaphragm when the heat pressing roller rotates between two adjacent pole pieces.

2. The high-speed lamination method for lithium-ion batteries according to claim 1, characterized in that: Before the core is hot-pressed, the core is bundled with a binding tape; after the core is hot-pressed, the binding tape is released.

3. The high-speed lamination method for lithium-ion batteries according to claim 2, characterized in that: Hot pressing direction lines are drawn on the surface of the bundled core.

4. The high-speed lamination method for lithium-ion batteries according to claim 1, characterized in that: When the core is cut after hot pressing, a laser mechanism is used to cut the core.

5. A high-speed stacking device for lithium-ion batteries, used to implement the high-speed stacking method for lithium-ion batteries according to any one of claims 1 to 4, characterized in that: include: A diaphragm feeding mechanism, comprising a feeding roller, a tensioning roller and a conveyor belt, wherein the feeding roller is used to support a diaphragm roll, the tensioning roller is used to tension the diaphragm, the conveyor belt has a first end and a second end that are arranged oppositely, the feeding roller and the tensioning roller are adjacent to the first end, and the diaphragm on the diaphragm roll is laid on the conveyor belt and can move with the conveyor belt; An electrode sheet feeding mechanism is arranged at a distance from the conveyor belt, and is located between the first end and the second end, and is used for conveying the die-cut positive electrode sheet and negative electrode sheet to the diaphragm located on the conveyor belt; A first hot pressing mechanism, disposed above the conveyor belt and between the electrode feeding mechanism and the second end; A winding mechanism, disposed at the second end, for winding the separator with the positive electrode sheet and the negative electrode sheet laid thereon to form a winding core; A second hot pressing mechanism, disposed on a side of the winding mechanism away from the conveyor belt, for hot pressing the winding core; The slitting mechanism is arranged on a side of the second hot pressing mechanism away from the winding mechanism, and is used to slit the hot pressed winding core into at least two battery cell blanks.

6. The lithium-ion battery high-speed stacking device according to claim 5, characterized in that: The winding mechanism includes a winding shaft and a first driving mechanism that drives the winding shaft to rotate. A core unloading mechanism is also arranged between the winding mechanism and the second hot pressing mechanism. The core unloading mechanism includes an upper clamping jaw and a lower clamping jaw arranged at intervals in the vertical direction. An intermediate unloading tray is arranged between the upper clamping jaw and the lower clamping jaw. The intermediate unloading tray can be inserted into the middle of the core.

7. A lithium ion battery, characterized in that: The lithium-ion battery is manufactured and formed by the high-speed lamination method of any one of claims 1 to 4.

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