A lithium supplement winding machine

Abstract

The present invention discloses a lithium replenishment winding machine, including a lithium replenishment mechanism for coating and replenishing lithium on a pole piece and a winding mechanism for winding the pole piece after lithium replenishment into a battery cell, and a material storage mechanism is also provided between the lithium replenishment mechanism and the winding mechanism, and the pole piece after lithium replenishment passes through the material storage mechanism and then is transferred to the winding mechanism for winding. The present invention organically combines the originally independent lithium replenishment mechanism and the winding mechanism by adding a material storage mechanism to form a complete lithium replenishment winding machine device integrating lithium replenishment and winding, so that the production line of lithium batteries is shortened, which not only saves the use and maintenance costs of the equipment, but also saves the use costs of space, and also reduces the danger caused by the excessively long transportation route of the pole piece after lithium replenishment.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery production and processing equipment, and in particular to a lithium replenishing and winding all-in-one machine. Background Art

[0002] At present, the lithium battery industry at home and abroad has a good development prospect. Lithium-ion batteries have been widely used in portable appliances such as laptops, cameras, and mobile communications due to their unique performance advantages. The large-capacity lithium-ion batteries currently developed have begun to be tested in electric vehicles and are expected to become one of the main power sources for electric vehicles in the 21st century. They will also be used in artificial satellites, aerospace, and energy storage. With the shortage of energy and the pressure of environmental protection in the world, lithium batteries are widely used in the electric vehicle industry, especially the emergence of lithium iron phosphate batteries, which has further promoted the development and application of the lithium battery industry.

[0003] In the lithium battery manufacturing process, the pole piece will enter the next process - winding after lithium replenishment. Since the metal activity of lithium is very high, all the processes after lithium replenishment must be carried out in a specific dry environment. This requires the production line to be as short as possible, which not only saves the equipment maintenance cost, but also saves the space cost, and also reduces the danger caused by the long transportation route of the pole piece after lithium replenishment. Therefore, the two must be organically combined to form a complete equipment for production.

[0004] After the electrode is replenished with lithium, the lithium and the silicon-carbon material in the electrode will react chemically to generate heat. Therefore, there needs to be a certain time difference between the coating lithium replenishment process section and the winding process section. This time cannot be too short, but it cannot be too long. If the time is too short, it is still in a period of intense reaction after winding, and the diaphragm may be easily burned due to excessive temperature. If the time is too long, the electrode will become brittle after the complete reaction, which will affect the quality after winding. In order to solve the above problems, the present invention integrates the characteristics of a lithium replenishment all-in-one machine and a electrode winding machine, and proposes a lithium replenishment and winding all-in-one machine. Summary of the invention

[0005] In order to overcome the deficiencies of the prior art, the present invention provides a lithium supplementation winding machine.

[0006] The technical solution of the present invention is as follows:

[0007] A lithium replenishment and winding integrated machine comprises a lithium replenishment mechanism for coating and replenishing lithium on pole pieces and a winding mechanism for winding the pole pieces after lithium replenishment into battery cells. A material storage mechanism is also arranged between the lithium replenishment mechanism and the winding mechanism. The pole pieces after lithium replenishment pass through the material storage mechanism and are then transferred to the winding mechanism for winding.

[0008] According to the above scheme of the present invention, the material storage mechanism includes two rows of relatively arranged fixed roller assemblies and movable roller assemblies, and the movable roller assembly can move left and right in the horizontal direction. After the lithium-supplemented electrode sheet passes through the fixed roller assembly and the movable roller assembly, it is transmitted to the winding mechanism for winding.

[0009] Furthermore, the material storage mechanism further comprises a movable roller moving module, the movable end of the movable roller moving module is connected to the movable roller assembly, and the movable roller moving module drives the movable roller assembly to move left and right in the horizontal direction.

[0010] Furthermore, the material storage mechanism further includes a first position sensor and a second position sensor, wherein the first position sensor is arranged at the leftmost end of the moving path of the moving roller assembly, and the second position sensor is arranged at the rightmost end of the moving path of the moving roller assembly.

[0011] According to the above scheme of the present invention, a pole piece winding mechanism and a entraining robot are arranged at the joint between the lithium replenishing mechanism and the material storage mechanism. The entraining robot is arranged between the pole piece winding mechanism and the material storage mechanism. The entraining robot sends the pole piece after lithium replenishment into the material storage mechanism or the pole piece winding mechanism.

[0012] Furthermore, a first material receiving platform and a second material receiving platform are arranged between the electrode winding mechanism and the material storage mechanism, the first material receiving platform is close to the electrode winding mechanism, and the second material receiving platform is close to the material storage mechanism, and the entraining robot sends the electrode after lithium supplementation to the first material receiving platform or the second material receiving platform to dock with the original electrode.

[0013] According to the present invention of the above scheme, a CCD detection mechanism and a labeling mechanism are further provided between the lithium replenishing mechanism and the winding mechanism.

[0014] According to the above scheme of the present invention, the lithium replenishing mechanism includes a pole piece unwinding device, a lithium film conveying device and a coating device. The pole piece unwinding device feeds the pole piece into the coating device, and the lithium film conveying device feeds the traction film attached with the lithium film into the coating device. The lithium film is attached to the pole piece under the extrusion of the coating device.

[0015] According to the present invention of the above scheme, the winding mechanism includes a separator unwinding device and a winding device, and the separator unwinding device feeds the separator into the winding device for winding.

[0016] The present invention according to the above scheme further comprises an electric control box, and the electric control box is electrically connected to the lithium replenishing mechanism, the winding mechanism and the material storage mechanism respectively.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention organically combines the originally independent lithium replenishment mechanism and winding mechanism by adding a material storage mechanism to form a complete lithium replenishment winding machine that integrates lithium replenishment and winding, so that the production line of lithium batteries is shortened, which not only saves the use and maintenance costs of the equipment, but also saves the use cost of space, and also reduces the danger caused by the long transportation route of the pole piece after lithium replenishment;

[0019] 2. The present invention adds a material storage mechanism between the coating lithium replenishment process section and the winding process section to store the pole piece after lithium replenishment, and controls the time from the pole piece after lithium replenishment to the winding process section, thereby meeting the demand for pole piece after lithium replenishment;

[0020] 3. The present invention sets a first position sensor at the leftmost end of the moving path of the moving roller assembly, and sets a second position sensor at the rightmost end of the moving path of the moving roller assembly, and controls the linear speed of the lithium replenishing mechanism and the winding mechanism through the first position sensor and the second position sensor. The whole process is controlled by the tension, and the speed changes stably and smoothly, thereby ensuring that the battery cells can be produced smoothly and safely.

[0021] 4. The present invention is provided with a pole piece winding mechanism, a carrying manipulator and a material receiving platform at the joint of the lithium replenishing mechanism and the material storage mechanism. The carrying manipulator and the material receiving platform can change the path of the pole piece after lithium replenishment into the material storage mechanism to enter the pole piece winding mechanism, thereby ensuring that the lithium replenishing mechanism can still complete the production of the whole roll of pole pieces on the pole piece unwinding mechanism under the premise of failure of the material storage mechanism or the winding mechanism;

[0022] 5. The present invention has a compact structure, excellent performance, and can be applied industrially. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0024] Figure 2 It is a structural schematic diagram of another embodiment of the present invention;

[0025] Figure 3 It is a structural schematic diagram of another embodiment of the present invention.

[0026] In the figure,

[0027] 1. Lithium replenishing mechanism; 101. Coating device; 102. Anode sheet unwinding device; 103. Cathode sheet unwinding device;

[0028] 2. Winding mechanism; 201. Winding device; 202. First diaphragm unwinding device; 203. Second diaphragm unwinding device; 2011. First winding needle 2011; 2012. Second winding needle 2012;

[0029] 3. Material storage mechanism; 301. Fixed roller assembly; 302. Moving roller assembly; 303. First position sensor; 304. Second position sensor; 3011. Fixed roller; 3021. Moving roller;

[0030] 4. Pole piece winding mechanism;

[0031] 5. Entrainment manipulator;

[0032] 6. The first material receiving platform;

[0033] 7. The second material receiving platform;

[0034] 8. CCD detection mechanism; 801. A-side CCD detection device; 802. B-side CCD detection device;

[0035] 9. Labeling agency;

[0036] 10. Fixed pulley. DETAILED DESCRIPTION

[0037] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0038] It should be noted that when a component is referred to as being "disposed on" or "fixed on" another component, it may be directly or indirectly located on the other component. When a component is referred to as being "connected to" another component, it may be directly or indirectly connected to the other component. The directions or positions indicated by the terms "upper", "lower", "left", "right", "horizontal", "vertical", etc. are based on the directions or positions shown in the accompanying drawings and are only for the convenience of description and are not to be construed as limitations on the present technical solution. The terms "first" and "second" are only used for the convenience of description and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0039] See also Figure 1, an embodiment of the present invention provides a lithium replenishment winding machine, including a lithium replenishment mechanism 1 for coating and replenishing lithium on a pole piece and a winding mechanism 2 for winding the pole piece after lithium replenishment into a battery cell, and a material storage mechanism 3 is also arranged between the lithium replenishment mechanism 1 and the winding mechanism 2, and the pole piece after lithium replenishment passes through the material storage mechanism 3 and then is transferred to the winding mechanism 2 for winding. Since the lithium and the silicon-carbon material in the pole piece will react chemically to generate heat after the pole piece is replenished with lithium, a certain time difference is required between the coating and lithium replenishment process section and the winding process section. This time cannot be too short, but it cannot be too long. If the time is too short, it is still in a strong reaction period after winding, and the temperature is too high to burn the diaphragm, and if the time is too long, the pole piece will become brittle after the complete reaction, affecting the quality of the battery cell after winding. In view of the above problems, the present invention adds a material storage mechanism 3 between the coating and lithium replenishment process section and the winding process section to store the pole piece after lithium replenishment, and controls the time from the pole piece after lithium replenishment to the winding process section, thereby meeting the needs of the pole piece after lithium replenishment.

[0040] The present invention organically combines the originally independent lithium replenishment mechanism 1 and the winding mechanism 2 together by adding a material storage mechanism 3, thereby forming a complete lithium replenishment and winding all-in-one lithium replenishment and winding machine equipment, which shortens the lithium battery production line, not only saves the equipment use and maintenance costs, but also saves the space use cost, and also reduces the danger caused by the excessively long transportation route of the pole pieces after lithium replenishment; the present invention has a compact structure and excellent performance and can be industrialized.

[0041] See also Figure 1 The storage mechanism 3 includes two rows of fixed roller assemblies 301 and movable roller assemblies 302 arranged opposite to each other. The fixed roller assembly 301 includes a plurality of fixed rollers 3011 evenly distributed in the vertical direction. The movable roller assembly 302 includes a plurality of movable rollers 3021 evenly distributed in the vertical direction. The movable roller assembly 302 can move left and right in the horizontal direction. The electrode pieces after lithium supplementation pass through the fixed rollers 3011 of the fixed roller assembly 301 and the movable rollers 3021 of the movable roller assembly 302 in sequence and then are transferred to the winding mechanism 2 for winding. The storage mechanism 3 further includes a movable roller moving module (not shown in the figure, the same below). The movable end of the movable roller moving module is connected to the movable roller assembly 302, and the movable roller moving module drives the movable roller assembly 302 to move left and right in the horizontal direction.

[0042] Since the winding mechanism 2 needs to constantly replace the winding needle during the winding process (the winding mechanism 2 includes two relatively arranged first winding needles 2011 and second winding needles 2012 that can be replaced in turn, after the first winding needle 2011 winds a full battery cell, the turntable rotates 180° to the unwinding position for unwinding, and the empty second winding needle 2012 reaches the winding station to continue winding the next battery cell), in this process, since the lithium-replenished electrode sheet from the lithium replenishing mechanism 1 is in a paused state in the winding mechanism 2, and the production of the lithium replenishing mechanism 1 is continuously in progress, if the lithium replenishing mechanism 1 pauses in the middle, the lithium film thickness of the same electrode sheet will be different and scrapped. Therefore, the movable roller moving module needs to drive the movable roller assembly 302 to move right, lengthening the distance between the fixed roller assembly 301 and the movable roller assembly 302, and storing the lithium-replenished electrode sheet from the lithium replenishing mechanism 1. At the same time, in order to allow the storage mechanism 3 to work effectively all the time, when the winding mechanism 2 restarts the winding work, the linear speed it generates must be greater than the linear speed of the lithium replenishing mechanism 1, so that the lithium-replenished electrode sheets entering and leaving the storage mechanism 3 per unit time can reach a balance and the total length is also within a certain range, thereby ensuring that the lithium-replenished electrode sheets reach the winding mechanism 2 within a certain time.

[0043] See also Figure 1 In one embodiment, for safety reasons, the material storage mechanism 3 further includes a first position sensor 303 and a second position sensor 304. The first position sensor 303 is arranged at the leftmost end of the moving path of the moving roller assembly 302, and the second position sensor 304 is arranged at the rightmost end of the moving path of the moving roller assembly 302. When the moving roller assembly 302 moves to the leftmost end of its moving path, it means that the electrode pieces after lithium replenishment stored in the material storage mechanism 3 are lower than the lowest point required by the process. At this time, the first position sensor 303 sends a signal, and the winding mechanism 2 reduces its winding linear speed; when the moving roller assembly 302 moves to the rightmost end of its moving path, it means that the electrode pieces after lithium replenishment stored in the material storage mechanism 3 are higher than the highest point required by the process. At this time, the second position sensor 304 sends a signal, and the lithium replenishment mechanism 1 reduces its linear speed. The whole process is controlled by tension, and the speed changes stably and smoothly, thereby ensuring that the battery cell can be produced smoothly and safely.

[0044] See also Figure 2In one embodiment, in order to ensure that the lithium replenishment mechanism 1 can still produce the entire roll of pole pieces on the pole piece unwinding mechanism under the premise of failure of the material storage mechanism 3 or the winding mechanism 2 (if the lithium replenishment is stopped midway, the pole pieces will be scrapped), a pole piece winding mechanism 4 and a carrying manipulator are provided at the joint between the lithium replenishment mechanism 1 and the material storage mechanism 3, and the carrying manipulator sends the pole piece after lithium replenishment into the material storage mechanism 3 or the pole piece winding mechanism 4. At the same time, a first material receiving platform and a second material receiving platform are also provided between the pole piece winding mechanism and the material storage mechanism, the first material receiving platform is close to the pole piece winding mechanism, and the second material receiving platform is close to the material storage mechanism, and the carrying manipulator sends the pole piece after lithium replenishment into the first material receiving platform or the second material receiving platform to dock with the original pole piece.

[0045] When a mechanical or control failure occurs in the storage mechanism 3 or the winding mechanism 2, the system issues an alarm, the linear speed of the lithium replenishment mechanism 1 decreases, and the entrainment robot clamps and cuts off the lithium-replenished electrode at the feeding end of the storage mechanism, and then clamps the lithium-replenished electrode and transfers it to the electrode winding mechanism. At this time, there will be two situations:

[0046] (1) The electrode sheet rewinding mechanism 4 is still empty: the entraining robot 5 directly transfers the electrode sheet after lithium replenishment from the feeding end A of the storage mechanism 3 to the feeding end B of the electrode sheet rewinding mechanism, and sticks the electrode sheet after lithium replenishment to the reel of the electrode sheet rewinding mechanism 4. The preset double-sided adhesive on the reel sticks to the electrode sheet after lithium replenishment and then enters the rewinding state (after the electrode sheet after lithium replenishment is rolled up, the linear speed of the lithium replenishment mechanism 1 returns to normal), until the production of the whole roll of electrode sheet lithium replenishment is completed and handed over to other winding machines for winding the battery cells.

[0047] (2) The electrode sheet rewinding mechanism 4 already has material: There is a section of original electrode sheet from the reel of the electrode sheet rewinding mechanism 4 to the first material receiving platform 6, and the original electrode sheet is in a tensioned state under the joint action of the material pressing mechanism of the first material receiving platform 6 and the electrode sheet rewinding mechanism 4. At this time, the entraining robot 5 transfers the electrode sheet after lithium replenishment from the feeding end A of the material storage mechanism 3 to the receiving end B attached to the first material receiving platform 6. The first material receiving platform 6 presses the original electrode sheet and the electrode sheet after lithium replenishment sent by the entraining robot 5 and rotates together, and then completes the tape splicing action under the action of the shear knife and the tape, and the electrode sheet after lithium replenishment enters the rewinding state (after the electrode sheet after lithium replenishment is rolled up, the linear speed of the lithium replenishment mechanism 1 returns to normal), until the production of the whole roll of electrode sheet lithium replenishment is completed and handed over to other winding machines for winding the battery cell.

[0048] Regardless of which of the above situations is true, when the tape splicing process is completed, the tape travel speed of the lithium replenishing mechanism is controlled by the tension and is carried out at the action speed of the clamping manipulator.

[0049] After the fault of the material storage mechanism 3 or the winding mechanism 2 is eliminated, if there are still many electrodes in the lithium replenishment mechanism 1, they can be connected with the cut lithium-replenished electrode through the entraining robot 5 and the second material receiving platform 7 and re-enter the material storage mechanism 3.

[0050] See also Figure 3 In one embodiment, a CCD detection mechanism 8 and a labeling mechanism 9 are further provided between the lithium replenishment mechanism 1 and the winding mechanism 2. The quality of the electrode after lithium replenishment is inspected by the CCD detection mechanism 8. If unqualified products appear, the CCD detection mechanism 8 sends a signal, and the system instructs the labeling mechanism 9 to act, and the labeling mechanism 9 marks the unqualified product sections on the electrode after lithium replenishment. Because the production of the lithium replenishment mechanism 1 is continuously ongoing, the electrode after lithium replenishment with the mark normally enters the winding mechanism 2 for winding. After being wound into a battery cell, because the battery cell carries the mark of the unqualified product section, the battery cell is treated as waste and does not enter the next process. Among them, the CCD detection mechanism 8 includes an A-side CCD detection device 801 and a B-side CCD detection device 802. The A-side CCD detection device 801 detects the A-side of the electrode after lithium replenishment, and the B-side CCD detection device 802 detects the B-side of the electrode after lithium replenishment.

[0051] In one embodiment, the lithium replenishing mechanism 1 includes a pole piece unwinding device, a lithium film conveying device and a coating device 101. The pole piece unwinding device feeds the pole piece into the coating device 101, and the lithium film conveying device feeds the traction film attached with the lithium film into the coating device 101. The lithium film is attached to the pole piece under the extrusion of the coating device 101. The film material conveying mechanism includes an A-side film material unwinding device (not shown in the figure, the same below), an A-side film material rewinding device (not shown in the figure, the same below), a B-side film material unwinding device (not shown in the figure, the same below), and a B-side film material rewinding device (not shown in the figure, the same below). The A-side film material unwinding device and the A-side film material rewinding device feed the A-side traction film attached with the A-side lithium film into the coating device 101, and the B-side film material unwinding device and the B-side film material rewinding device feed the B-side traction film attached with the B-side lithium film into the coating device 101. The A-side lithium film and the B-side lithium film are respectively and simultaneously attached to the electrode sheet under the extrusion of being fed into the coating device 101 to form the electrode sheet after lithium supplementation; the A-side traction film is peeled off after coming out of the coating device 101 and is rewound by the A-side film material; the B-side traction film is peeled off after coming out of the coating device 101 and is rewound by the B-side film material rewinding device.

[0052] In one embodiment, the electrode unwinding device includes an unwinding shaft (not shown in the figure, the same below) and an unwinding motor (not shown in the figure, the same below), and the unwinding motor is rotatably connected to the unwinding shaft and drives the unwinding shaft to rotate. At the same time, a correction mechanism is provided on the unwinding shaft, and a correction sensor is provided between the electrode unwinding device and the coating device 101, and the correction sensor is electrically connected to the correction mechanism. Because the position of the electrode is deviated due to the vibration of the mechanical structure or other factors during the unwinding process, the provision of a correction sensor and a correction mechanism can solve this problem well. When the correction sensor senses that the position of the electrode is deviated, the correction mechanism can adjust the position of the unwinding shaft for correction.

[0053] In one embodiment, the winding mechanism 2 includes a diaphragm unwinding device and a winding device 201, and the diaphragm unwinding device feeds the isolation film into the winding device 201 for winding. Specifically, the diaphragm unwinding device includes a first diaphragm unwinding device 202 and a second diaphragm unwinding device 203, and the electrode unwinding device includes an anode sheet unwinding device 102 and a cathode sheet unwinding device 103, and the anode sheet unwinding device 102 and the cathode sheet unwinding device 103 feed the lithium-supplemented anode sheet and the lithium-supplemented cathode sheet into the winding device 201 for winding, and the first diaphragm unwinding device 202 and the second diaphragm unwinding device 203 feed the first isolation film and the second isolation film into the winding device 201 for winding; the winding device 201 includes two first winding needles 2011 and second winding needles 2012 that are relatively arranged and can be replaced in turn.

[0054] In one embodiment, an electric control box (not shown in the figure, the same below) is further included, which is electrically connected to the lithium replenishment mechanism 1, the winding mechanism 2 and the material storage mechanism 3, respectively, and is used to comprehensively control the operation of the lithium replenishment mechanism 1, the winding mechanism 2 and the material storage mechanism 3, so as to realize automated production. Preferably, a touch screen is provided on the electric control box, and the control of the lithium replenishment winding machine can be realized through the touch screen.

[0055] In one embodiment, since the integrated lithium winding machine has many components and many intersections, the layout of each component can be made more compact by adjusting the direction of the isolation membrane and the pole piece, and the overall volume of the integrated lithium winding machine can be reduced as much as possible. To this end, the integrated lithium winding machine is provided with a plurality of fixed pulleys 10 for adjusting the direction of the isolation membrane and the pole piece. The direction of the isolation membrane and the pole piece is adjusted by the fixed pulley 10, which saves equipment installation space and optimizes the equipment structure.

[0056] The beneficial effects of the present invention are:

[0057] 1. The present invention organically combines the originally independent lithium replenishment mechanism 1 and winding mechanism 2 by adding a material storage mechanism 3 to form a complete lithium replenishment winding machine that integrates lithium replenishment and winding, so that the production line of lithium batteries is shortened, which not only saves the use and maintenance costs of the equipment, but also saves the use cost of space, and also reduces the danger caused by the long transportation route of the pole piece after lithium replenishment;

[0058] 2. The present invention adds a material storage mechanism 3 between the coating lithium replenishment process section and the winding process section to store the electrode after lithium replenishment, and controls the time from the electrode after lithium replenishment to the winding process section, thereby meeting the demand for electrode after lithium replenishment;

[0059] 3. The present invention sets a first position sensor 303 at the leftmost end of the moving path of the movable roller assembly 302, and sets a second position sensor 304 at the rightmost end of the moving path of the movable roller assembly 302, and controls the linear speed of the lithium replenishing mechanism 1 and the winding mechanism 2 by means of the first position sensor 303 and the second position sensor 304. The whole process is controlled by the tension, and the speed changes stably and smoothly, thereby ensuring that the battery cells can be produced smoothly and safely.

[0060] 4. The present invention is provided with a pole piece winding mechanism 4, a carrying manipulator and a material receiving platform at the joint between the lithium replenishing mechanism 1 and the material storage mechanism 3. The carrying manipulator and the material receiving platform can change the path of the pole piece after lithium replenishment into the material storage mechanism 3 to enter the pole piece winding mechanism 4, thereby ensuring that the lithium replenishing mechanism 1 can still produce the whole roll of pole pieces on the pole piece unwinding mechanism under the premise of failure of the material storage mechanism 3 or the winding mechanism 2;

[0061] 5. The present invention has a compact structure, excellent performance, and can be applied industrially.

[0062] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

[0063] The above is an exemplary description of the present invention in conjunction with the accompanying drawings. It is obvious that the implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made by adopting the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A lithium replenishment and winding integrated machine, comprising a lithium replenishment mechanism for coating and replenishing lithium on a pole piece and a winding mechanism for winding the pole piece after lithium replenishment into a battery cell, characterized in that: A material storage mechanism is also provided between the lithium replenishing mechanism and the winding mechanism, and the electrode sheet after lithium replenishment passes through the material storage mechanism and then is transferred to the winding mechanism for winding; The material storage mechanism comprises two rows of fixed roller assemblies and movable roller assemblies arranged opposite to each other, a movable roller moving module, a first position sensor and a second position sensor, the movable end of the movable roller moving module is connected to the movable roller assembly, the movable roller moving module drives the movable roller assembly to move left and right in the horizontal direction, the first position sensor is arranged at the leftmost end of the moving path of the movable roller assembly, and the second position sensor is arranged at the rightmost end of the moving path of the movable roller assembly, and the electrode piece after lithium supplementation passes through the fixed roller assembly and the movable roller assembly, and then is transmitted to the winding mechanism for winding; A pole piece winding mechanism and a carrying robot are arranged at the joint between the lithium replenishing mechanism and the material storage mechanism. The carrying robot is arranged between the pole piece winding mechanism and the material storage mechanism. When a mechanical or control failure occurs in the material storage mechanism or the winding mechanism, the linear speed of the lithium replenishing mechanism is reduced, and the carrying robot clamps and cuts the pole piece after lithium replenishment at the feeding end of the material storage mechanism, and then clamps the pole piece after lithium replenishment and transfers it to the pole piece winding mechanism.

2. The lithium supplement winding machine according to claim 1, characterized in that: A first material receiving platform and a second material receiving platform are also provided between the electrode winding mechanism and the material storage mechanism. The first material receiving platform is close to the electrode winding mechanism, and the second material receiving platform is close to the material storage mechanism. The entraining robot sends the electrode after lithium supplementation to the first material receiving platform or the second material receiving platform to dock with the original electrode.

3. The lithium supplement winding machine according to claim 1, characterized in that: A CCD detection mechanism and a labeling mechanism are also provided between the lithium replenishing mechanism and the winding mechanism.

4. The lithium supplement winding machine according to claim 1, characterized in that: The lithium replenishing mechanism includes a pole piece unwinding device, a lithium film conveying device and a coating device. The pole piece unwinding device feeds the pole piece into the coating device, the lithium film conveying device feeds the traction film attached with the lithium film into the coating device, and the lithium film is attached to the pole piece under the extrusion of the coating device.

5. The lithium supplement winding machine according to claim 1, characterized in that: The winding mechanism comprises a diaphragm unwinding device and a winding device, and the diaphragm unwinding device feeds the isolation film into the winding device for winding.

6. The lithium supplement winding machine according to claim 1, characterized in that: It further includes an electric control box, which is electrically connected to the lithium replenishing mechanism, the winding mechanism and the material storage mechanism respectively.

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