Battery cell production line

Abstract

The utility model relates to a battery cell production line which comprises an anode feeding mechanism, a cathode feeding mechanism, a lamination mechanism, a weighing mechanism and a conveying mechanism, and the anode feeding mechanism is used for producing anode strips; the cathode feeding mechanism is used for producing cathode sheets; the lamination mechanism is arranged at the downstream section of the anode feeding mechanism and is arranged at the downstream section of the cathode feeding mechanism; the lamination mechanism is used for laminating the anode plates and the cathode plates to form naked battery cells; the weighing mechanism is provided with a stacking area, a weighing area and a feeding area, the stacking area is arranged on the downstream section of the cathode feeding mechanism, the weighing area is arranged on the downstream section of the stacking area, and the feeding area is arranged on the downstream section of the weighing area and on the upstream section of the lamination mechanism; and the conveying mechanism is used for conveying pole pieces among the mechanisms.

Description

Technical Field

[0001] The present application relates to the technical field of battery production, and in particular to a battery cell production line. Background Art

[0002] Battery cell capacity is one of the important indicators for measuring battery performance. In traditional technology, the capacity of the battery cell is usually tested after the battery cell is assembled, and then the battery cells with unqualified test results are discarded. However, this method will cause waste of battery cell materials and increase production costs. Summary of the invention

[0003] Based on this, it is necessary to provide a battery cell production line to address the problem that traditional technology will cause waste of battery cell production materials and increase production costs.

[0004] The technical solution is as follows:

[0005] One embodiment provides a battery cell production line, including:

[0006] An anode feeding mechanism, wherein the anode feeding mechanism is used to produce anode sheets;

[0007] A cathode feeding mechanism, wherein the cathode feeding mechanism is used to produce cathode sheets;

[0008] A lamination mechanism, which is arranged at a downstream section of the anode feeding mechanism and at a downstream section of the cathode feeding mechanism, and is used to laminate the anode sheet and the cathode sheet to form a bare cell;

[0009] A weighing mechanism, wherein the weighing mechanism has a stacking area, a weighing area and a feeding area, the stacking area is arranged at a downstream section of the cathode feeding mechanism, the weighing area is arranged at a downstream section of the stacking area, the feeding area is arranged at a downstream section of the weighing area and at an upstream section of the lamination mechanism; and

[0010] The conveying mechanism is used to convey the pole pieces between the mechanisms.

[0011] In the above-mentioned battery cell production line, the conveying mechanism can transport the anode sheets produced by the anode feeding mechanism to the stacking mechanism, and the conveying mechanism can also transport the cathode sheets produced by the cathode feeding mechanism to the weighing mechanism and then to the stacking mechanism. The weighing mechanism has a stacking area, a weighing area and a feeding area arranged in sequence. The conveying mechanism transports the cathode sheets produced by the cathode feeding mechanism to the stacking area, and the cathode sheets located in the stacking area are transferred to the weighing area to weigh the cathode sheets. When the weight of the cathode sheets obtained in the weighing area does not match the weight of the cathode sheets corresponding to the capacity of the battery cell currently being produced, the staff is reminded to discard the cathode sheets in the current weighing area. When the weight of the cathode sheet obtained in the weighing area matches the weight of the cathode sheet corresponding to the capacity of the battery cell currently being produced, the cathode sheet located in the weighing area will be further transferred to the loading area, and the conveying mechanism will convey the cathode sheet in the loading area to the stacking mechanism. Compared with the traditional technology, the above-mentioned battery cell production line can weigh the cathode sheet before stacking the cathode sheet and the anode sheet to discard the cathode sheet that does not meet the battery cell capacity, avoiding the situation in the traditional technology where the battery cells that do not meet the battery cell capacity are discarded after the battery cells are produced. This not only saves the raw materials of the battery cells, but also eliminates the process of processing the cathode sheets that do not meet the battery cell capacity, thereby reducing production costs.

[0012] In one embodiment, the weighing mechanism further includes at least three material boxes, a first transfer module and a second transfer module, the material boxes are used to carry the cathode sheets, at least one of the material boxes is located in the material stacking area, at least one of the material boxes is located in the weighing area, at least one of the material boxes is located in the loading area, the first transfer module is used to transfer the material box located in the weighing area to the loading area, the first transfer module is also used to transfer the material box located in the material stacking area to the weighing area, and the second transfer module is used to transfer the material box located in the loading area to the material stacking area.

[0013] The material box is used to carry the cathode sheets, which not only provides protection for the cathode sheets, but also facilitates the transfer of the cathode sheets in the material box. The conveying mechanism transports the cathode sheets produced by the discharging equipment to the material box in the stacking area, and the first transfer module then transports the material box in the stacking area together with the unweighed cathode sheets to the weighing area for weighing. After the weighing is completed, the first transfer module transports the material box in the weighing area together with the weighed cathode sheets to the loading area, so that the conveying mechanism can transport the cathode sheets in the material box in the loading area to the stacking mechanism. When all the cathode sheets in the material box in the loading area are transported, the second transfer module transports the empty material box in the loading area to the stacking area, and the conveying mechanism transports the cathode sheets produced by the cathode loading mechanism to the material box in the stacking area, and so on. This makes the weighing process of the cathode sheets on the battery cell production line more convenient, thereby improving the production efficiency of the battery cell production line.

[0014] In one embodiment, the first transfer module includes a first jaw, a second jaw and a first movable arm, the first jaw and the second jaw are both arranged on the first movable arm, the direction of the stacking area toward the loading area is set as the first direction, the first movable arm can reciprocate along the first direction, the first jaw is used to clamp the material box located in the weighing area and release the material box in the loading area, and the second jaw is used to clamp the material box located in the stacking area and release the material box in the weighing area.

[0015] The first jaw can be driven by the first movable arm to reciprocate along the first direction to grab the material box in the weighing area to the loading area. The second jaw can be driven by the first movable arm to reciprocate along the first direction to grab the material box in the stacking area to the weighing area. The first jaw and the second jaw can grasp and release the material box more stably and reliably to prevent the material box from falling during transportation, thereby improving the production reliability of the battery cell production line. In addition, the first movable arm can drive the first jaw and the second jaw to move at the same time to simultaneously transfer the material boxes in the stacking area and the material boxes in the weighing area to the weighing area and the loading area, thereby improving production efficiency.

[0016] In one embodiment, the second transfer module includes a third clamp and a second movable arm, the third clamp is provided on the second movable arm, the second movable arm can reciprocate along the first direction, the moving trajectory of the second movable arm is staggered with the moving trajectory of the first movable arm, and the third clamp is used to clamp the material box located in the loading area and release the material box in the stacking area.

[0017] The third clamp can move back and forth along the first direction driven by the second movable arm to transport the empty material box in the loading area to the stacking area, so that the conveying mechanism can then transport the cathode sheets produced by the cathode loading mechanism to the empty material box in the stacking area. The third clamp can grasp and release the empty material box more stably and reliably to prevent the empty material box from falling during transportation, thereby improving the production reliability of the battery cell production line. The moving trajectory of the second movable arm is staggered with the moving trajectory of the first movable arm, so that the second movable arm and the first movable arm can move simultaneously and will not interfere with each other during the movement, thereby improving production efficiency.

[0018] In one embodiment, the stacking mechanism includes a first pole piece correction module, a second pole piece correction module and a stacking module, the first pole piece correction module is arranged in the downstream section of the anode feeding mechanism and in the upstream section of the stacking module, the second pole piece correction module is arranged in the downstream section of the feeding area and is located in the upstream section of the stacking module.

[0019] The conveying mechanism transports the anode sheets produced by the anode feeding mechanism to the first electrode sheet correction module and then to the stacking module. The conveying mechanism transports the cathode sheets in the feeding area to the second electrode sheet correction module and then to the stacking module. The first electrode sheet correction module and the second electrode sheet correction module can correct the anode sheets and cathode sheets respectively, and then stack the corrected anode sheets and cathode sheets through the stacking module, thereby improving the accuracy of battery cell stacking, avoiding safety hazards in later operation caused by the misalignment of anode sheets and cathode sheets after the battery cell production is completed, and ensuring the operation safety of the battery cell.

[0020] In one embodiment, the anode feeding mechanism includes a first feeding conveyor belt and a first material making module, the first feeding conveyor belt is arranged at the downstream section of the first material making module and at the upstream section of the stacking mechanism, and the cathode feeding mechanism includes a second feeding conveyor belt and a second material making module, the second feeding conveyor belt is arranged at the downstream section of the second material making module and at the upstream section of the stacking area.

[0021] The anode sheets produced by the first material making module can be conveyed to the upstream section of the stacking mechanism through the first feeding conveyor belt, so that the conveying mechanism can transport the anode sheets on the first feeding conveyor belt to the stacking mechanism. The cathode sheets produced by the second material making module can be conveyed to the upstream section of the weighing mechanism through the second feeding conveyor belt, so that the conveying mechanism can transport the cathode sheets on the second feeding conveyor belt to the weighing mechanism. The first feeding conveyor belt and the second feeding conveyor belt can provide more stable conveying conditions for the anode sheets and the cathode sheets respectively, and the first feeding conveyor belt and the second feeding conveyor belt can continuously transport the anode sheets and the cathode sheets, thereby improving the overall production efficiency of the battery cell production line.

[0022] In one embodiment, the first feeding conveyor belt is arranged in parallel with the second feeding conveyor belt, at least two stacking mechanisms are provided and are arranged at intervals along the extension direction of the first feeding conveyor belt, at least two weighing mechanisms and two conveying mechanisms are provided, and the weighing mechanisms and the conveying mechanisms are arranged one-to-one with the stacking mechanisms.

[0023] In this way, when the first feeding conveyor belt conveys the anode sheets in its own extension direction, at least two conveying mechanisms can sequentially transport the anode sheets on the first feeding conveyor belt to different stacking mechanisms; when the second feeding conveyor belt conveys the cathode sheets in its own extension direction, at least two conveying mechanisms can sequentially transport the cathode sheets on the second feeding conveyor belt to different weighing mechanisms, so that the battery cell production line can simultaneously stack at least two cathode sheets and at least two anode sheets to form at least two bare battery cells, thereby improving the production efficiency of the battery cell production line.

[0024] In one embodiment, the battery cell production line also includes a preheating mechanism and a hot pressing mechanism. The preheating mechanism is arranged at the downstream section of the lamination mechanism, and the preheating mechanism is used to preheat the bare battery cell. The hot pressing mechanism is arranged at the downstream section of the preheating mechanism, and the hot pressing mechanism is used to hot press the bare battery cell after the preheating treatment.

[0025] The conveying mechanism transports the bare battery cells located in the stacking mechanism to the preheating mechanism, and then transports the preheated bare battery cells to the hot pressing mechanism for hot pressing molding. The preheating mechanism can preheat the bare battery cells. When the hot pressing mechanism hot presses the preheated bare battery cells, the required hot pressing time is shorter, thereby reducing the total production time of the battery cells and improving the production efficiency of the battery cell production line.

[0026] In one embodiment, the preheating mechanism includes a first heating plate and a second heating plate, the first heating plate and the second heating plate are parallel to each other and spaced apart to form a preheating space, and the preheating space is used to accommodate the bare battery cell.

[0027] The conveying mechanism can transport the bare battery cells that have not been hot-pressed to the preheating space between the first heating plate and the second heating plate. The first heating plate and the second heating plate heat the bare battery cells in the preheating space to perform a preheating process on the bare battery cells, thereby reducing the time required for subsequent hot pressing and improving the production efficiency of the battery production line.

[0028] In one of the embodiments, the battery cell production line further includes a gluing mechanism, which is disposed at a downstream section of the lamination mechanism and at an upstream section of the preheating mechanism, and is used to perform gluing treatment on the bare battery cells.

[0029] The gluing mechanism can glue the bare cells after lamination, and the conveying mechanism then transports the glued bare cells to the preheating mechanism for preheating. After preheating, the bare cells are transported to the hot pressing mechanism through the conveying mechanism for hot pressing, so as to improve the production efficiency of the cell production line. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, 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 application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 This is a plan view of a battery cell production line in one embodiment of the present application.

[0032] Figure 2 It is a plan view of the stacking mechanism and the weighing mechanism in one embodiment of the present application.

[0033] Figure 3 This is a transportation flow chart of the conveying mechanism in one embodiment of the present application.

[0034] Figure 4 It is a transfer flow chart of the first transfer module and the second transfer module in one embodiment of the present application.

[0035] Figure 5 It is a plan view of the anode feeding mechanism and the cathode feeding mechanism in one embodiment of the present application.

[0036] Notes on the attached drawings:

[0037] 100, anode feeding mechanism; 110, first feeding conveyor belt; 120, first material making module; 121, anode unwinding unit; 122, pole ear forming unit; 123, pole piece cutting unit; 124, defect detection unit; 130, anode piece; 200, cathode feeding mechanism; 210, second feeding conveyor belt; 220, second material making module; 230, cathode piece; 300, lamination mechanism; 310, first pole piece deviation correction module; 320, second pole piece deviation correction module; 330, lamination Sheet module; 410, first transport unit; 420, second transport unit; 430, third transport unit; 440, fourth transport unit; 450, fifth transport unit; 460, pallet; 470, return conveyor belt; 500, weighing mechanism; 510, stacking area; 520, weighing area; 530, loading area; 540, material box; 550, first transfer module; 560, second transfer module; 600, preheating mechanism; 700, hot pressing mechanism; 800, gluing mechanism. DETAILED DESCRIPTION

[0038] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0039] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0040] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0041] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated 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, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0042] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0043] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0044] See also Figures 1 to 3 An embodiment of the present application provides a battery cell production line, including an anode feeding mechanism 100, a cathode feeding mechanism 200, a stacking mechanism 300, a weighing mechanism 500 and a conveying mechanism, wherein the anode feeding mechanism 100 is used to produce anode sheets 130; the cathode feeding mechanism 200 is used to produce cathode sheets 230; the stacking mechanism 300 is arranged at the downstream section of the anode feeding mechanism 100 and at the downstream section of the cathode feeding mechanism 200, and the stacking mechanism 300 is used to stack the anode sheets 130 and the cathode sheets 230 to form a bare battery cell; the weighing mechanism 500 has a stacking area 510, a weighing area 520 and a loading area 530, the stacking area 510 is arranged at the downstream section of the cathode feeding mechanism 200, the weighing area 520 is arranged at the downstream section of the stacking area 510, and the loading area 530 is arranged at the downstream section of the weighing area 520 and at the upstream section of the stacking mechanism 300; the conveying mechanism is used to transport the electrodes between the mechanisms.

[0045] In the above-mentioned battery cell production line, the conveying mechanism can transport the anode sheets 130 produced by the anode feeding mechanism 100 to the stacking mechanism 300, and the conveying mechanism can also transport the cathode sheets 230 produced by the cathode feeding mechanism 200 to the weighing mechanism 500 and then to the stacking mechanism 300. The weighing mechanism 500 has a stacking area 510, a weighing area 520 and a feeding area 530 arranged in sequence. The conveying mechanism transports the cathode sheets 230 produced by the cathode feeding mechanism 200 to the stacking area 510, and the cathode sheets 230 located in the stacking area 510 are transferred to the weighing area 520 to weigh the cathode sheets 230. When the weight of the cathode sheets 230 obtained in the weighing area 520 does not match the weight of the cathode sheets 230 corresponding to the capacity of the battery cell currently being produced, the staff is reminded to weigh the cathode sheets 230 in the current weighing area 520. 0 is discarded, and when the weight of the cathode sheet 230 obtained in the weighing area 520 is consistent with the weight of the cathode sheet 230 corresponding to the capacity of the battery cell currently being produced, the cathode sheet 230 located in the weighing area 520 is further transferred to the loading area 530, and the conveying mechanism conveys the cathode sheet 230 in the loading area 530 to the stacking mechanism 300; compared with the traditional technology, the above-mentioned battery cell production line can weigh the cathode sheet 230 before stacking the cathode sheet 230 and the anode sheet 130 to discard the cathode sheet 230 that does not meet the battery cell capacity, avoiding the situation in the traditional technology that the battery cells that do not meet the battery cell capacity are discarded after the battery cells are produced, which not only saves the raw materials of the battery cells, but also saves the process of processing the cathode sheets 230 that do not meet the battery cell capacity, thereby reducing the production cost.

[0046] Furthermore, the conveying mechanism in the above embodiment can transport the cathode sheets 230 and the anode sheets 130 between the cathode loading mechanism 200, the anode loading mechanism 100, the stacking mechanism 300 and the weighing mechanism 500 according to the upstream and downstream relationship; it can be understood that when other mechanisms appear in the following text, the conveying mechanism can still transport the cathode sheets 230 and the anode sheets 130 between the various mechanisms according to the upstream and downstream relationship, which is explained here together.

[0047] As an explanation, relevant studies have shown that when battery cells are produced, the weight fluctuation of the cathode material is the main factor affecting the capacity fluctuation of the finished battery cells. Therefore, in the present application, the cathode sheet 230 is weighed by the weighing mechanism 500 before the battery cells are assembled, and the battery cell capacity is predicted by the weighing result of the cathode sheet 230, so as to identify the cathode sheets 230 that do not meet the battery cell capacity in advance and reject them before stacking, so as to avoid the situation where the battery cells that do not meet the battery cell capacity are rejected after the battery cells are produced, thereby saving the battery cell raw materials and reducing the production cost.

[0048] Furthermore, in some embodiments of the present application, the cathode sheet 230 can be weighed by the weighing mechanism 500 and the cell capacity can be predicted, so as to facilitate grading the cell capacity in subsequent processes and improve the efficiency of the cell grading process.

[0049] Specifically, the stacking mechanism 300 includes a stacking table and a diaphragm unwinding module arranged above the stacking table. The diaphragm unwinding module can continuously provide diaphragms. When in use, the diaphragm unwinding module first unwinds on the stacking table and provides a first layer of diaphragm. The conveying mechanism transports a cathode sheet 230 located in the loading area 530 to the top of the first layer of diaphragm. The diaphragm unwinding module then unwinds above the cathode sheet 230 and provides a second layer of diaphragm. The conveying mechanism transports the anode sheet 130 produced by the anode loading mechanism 100 to the top of the second layer of diaphragm, and this process is repeated to form a bare battery cell.

[0050] Specifically, the weighing mechanism 500 includes a weighing platform and an electronic balance. The weighing platform has a stacking area 510, a weighing area 520 and a loading area 530 arranged in sequence. The electronic balance is located in the weighing area 520 to weigh the cathode sheet 230 from the loading area 530. After the weighing is completed, the cathode sheet 230 on the electronic balance is transferred to the loading area 530 for subsequent processes.

[0051] In one embodiment, the battery cell production line further includes a frame, and the anode loading mechanism 100, the cathode loading mechanism 200, the stacking mechanism 300, the weighing mechanism 500 and the conveying mechanism are all arranged on the frame to realize the integration of various equipment in the battery cell production line.

[0052] See also Figures 2 to 3 In one embodiment, the weighing mechanism 500 also includes at least three material boxes 540, a first transfer module 550 and a second transfer module 560. The material box 540 is used to carry the cathode sheet 230. At least one material box 540 is located in the stacking area 510, at least one material box 540 is located in the weighing area 520, and at least one material box 540 is located in the loading area 530. The first transfer module 550 is used to transfer the material box 540 located in the weighing area 520 to the loading area 530. The first transfer module 550 is also used to transfer the material box 540 located in the stacking area 510 to the weighing area 520. The second transfer module 560 is used to transfer the material box 540 located in the loading area 530 to the stacking area 510.

[0053] The material box 540 is used to carry the cathode sheet 230, which can not only provide protection for the cathode sheet 230, but also facilitate the transfer of the cathode sheet 230 in the material box 540. The conveying mechanism transports the cathode sheet 230 produced by the cathode feeding mechanism 200 to the material box 540 located in the stacking area 510, and the first transfer module 550 then transports the material box 540 in the stacking area 510 together with the unweighed cathode sheet 230 to the weighing area 520 for weighing. After the weighing is completed, the first transfer module 550 then transports the material box 540 in the weighing area 520 together with the weighed cathode sheet 230 The cathode sheets 230 in the material box 540 of the loading area 530 are transported to the stacking mechanism 300, and when all the cathode sheets 230 in the material box 540 of the loading area 530 are transported, the second transfer module 560 transports the empty material box 540 of the loading area 530 to the stacking area 510, and the conveying mechanism transports the cathode sheets 230 produced by the cathode loading mechanism 200 to the material box 540 of the stacking area 510, and so on and so forth, making the weighing process of the cathode sheets 230 of the battery cell production line more convenient and improving the production efficiency of the battery cell production line.

[0054] See also Figure 3 Furthermore, the cathode feeding mechanism 200 can continuously provide cathode sheets 230, and the conveying mechanism can sequentially stack at least two cathode sheets 230 from the cathode feeding mechanism 200 into the material box 540 in the stacking area 510, and the first transfer module 550 transports the material box 540 stacked with at least two cathode sheets 230 from the stacking area 510 to the weighing area 520 to weigh the at least two cathode sheets 230 in the material box 540. After the weighing is completed, the first transfer module 550 then transports the material box 540 stacked with at least two cathode sheets 230 It is transported from the weighing area 520 to the loading area 530. At this time, the conveying mechanism transports the stacked cathode sheets 230 in the material box 540 to the stacking mechanism 300 in sequence for subsequent stacking process. When all the cathode sheets 230 in the material box 540 are transported to the stacking mechanism 300, the material box 540 becomes an empty box, and the second transfer module 560 transports the empty box from the loading area 530 to the stacking area 510. The conveying mechanism then stacks at least two cathode sheets 230 from the cathode loading mechanism 200 into the empty box, and so on and so forth, thereby improving the production efficiency of the battery cell production line.

[0055] Furthermore, since a small amount of material particles of the cathode sheet 230 may fall into the material box 540 during transportation, when the second transfer module 560 transports the empty material box 540 from the loading area 530 to the stacking area 510, the second transfer module 560 can transfer the empty material box 540 from the loading area 530 to the weighing area 520 for weighing, and then transfer the empty material box 540 from the weighing area 520 to the stacking area 510, so that The total weight of the empty material box 540 and the material particles in the empty material box 540 is obtained. When the material box 540 with the cathode sheet 230 is weighed again in the weighing area 520, the total weight of the current cathode sheet 230 and the material box 540 is subtracted from the total weight of the empty material box 540 and the material particles in the empty material box 540. The total weight of the cathode sheet 230 in the material box 540 can be accurately obtained, the tare weighing of the cathode sheet 230 is achieved, and the weighing accuracy of the weighing mechanism 500 is improved.

[0056] See also Figure 3 In one embodiment, the first transfer module 550 includes a first clamp, a second clamp and a first movable arm, the first clamp and the second clamp are both arranged on the first movable arm, the direction from the stacking area 510 to the loading area 530 is set as the first direction, the first movable arm can reciprocate along the first direction, the first clamp is used to clamp the material box 540 located in the weighing area 520 and release the material box 540 in the loading area 530, and the second clamp is used to clamp the material box 540 located in the stacking area 510 and release the material box 540 in the weighing area 520.

[0057] The first jaw can be driven by the first movable arm to reciprocate along the first direction to grab the material box 540 located in the weighing area 520 to the loading area 530, and the second jaw can be driven by the first movable arm to reciprocate along the first direction to grab the material box 540 in the stacking area 510 to the weighing area 520. The first jaw and the second jaw can achieve more stable and reliable grasping and releasing of the material box 540 to prevent the material box 540 from falling during transportation, thereby improving the production reliability of the battery cell production line. In addition, the first movable arm can simultaneously drive the first jaw and the second jaw to move, so as to simultaneously transfer the material box 540 in the stacking area 510 and the material box 540 in the weighing area 520 to the weighing area 520 and the loading area 530, thereby improving production efficiency.

[0058] In addition, the first clamp and the second clamp can move back and forth along the first direction under the guidance of the first movable arm to simultaneously transport the material boxes 540 located in the weighing area 520 and the stacking area 510 to the loading area 530 and the weighing area 520 respectively, thereby improving transportation efficiency.

[0059] See also Figure 3In one embodiment, the second transfer module 560 includes a third clamp and a second movable arm, the third clamp is arranged on the second movable arm, the second movable arm can reciprocate along the first direction, the moving trajectory of the second movable arm is staggered with the moving trajectory of the first movable arm, and the third clamp is used to clamp the material box 540 located in the loading area 530 and release the material box 540 in the stacking area 510.

[0060] Driven by the second movable arm, the third clamp can reciprocate along the first direction to transfer the empty material box 540 located in the loading area 530 to the stacking area 510, so that the subsequent conveying mechanism can convey the cathode sheet 230 produced by the cathode loading mechanism 200 to the empty material box 540 in the stacking area 510. The third clamp can grasp and release the empty material box 540 more stably and reliably to prevent the empty material box 540 from falling during transportation, thereby improving the production reliability of the battery cell production line; the moving trajectory of the second movable arm is staggered with the moving trajectory of the first movable arm, so that the second movable arm and the first movable arm can move simultaneously and will not interfere with each other during the movement, thereby improving production efficiency.

[0061] Optionally, the first movable arm can drive the first clamp and the second clamp to move by rotating itself, and the first movable arm can also be movably set on a track on the gantry to drive the first clamp and the second clamp to move, as long as the first movable arm can achieve reciprocating movement along the first direction, no specific limitation is made here; the second movable arm is similar to the first movable arm and will not be repeated here.

[0062] In a preferred embodiment of the present application, the moving trajectory of the first movable arm and the moving trajectory of the second movable arm are offset in the direction of gravity (i.e., the vertical direction), so that the first movable arm and the second movable arm can move simultaneously and drive the first clamp, the second clamp and the third clamp to operate simultaneously without interfering with each other. The moving trajectories of the first movable arm and the second movable arm that are offset from each other in the direction of gravity are more reasonable, which shortens the transportation time of the material box 540 and improves production efficiency.

[0063] See also Figures 2 to 3 In one embodiment, the lamination mechanism 300 includes a first pole piece correction module 310, a second pole piece correction module 320 and a lamination module 330. The first pole piece correction module 310 is arranged at the downstream section of the anode feeding mechanism 100 and at the upstream section of the lamination module 330. The second pole piece correction module 320 is arranged at the downstream section of the feeding area 530 and is located at the upstream section of the lamination module 330.

[0064] The conveying mechanism transports the anode sheet 130 produced by the anode feeding mechanism 100 to the first electrode sheet correction module 310 and then to the stacking module 330. The conveying mechanism transports the cathode sheet 230 of the feeding area 530 to the second electrode sheet correction module 320 and then to the stacking module 330. The first electrode sheet correction module 310 and the second electrode sheet correction module 320 can correct the anode sheet 130 and the cathode sheet 230 respectively, and then stack the corrected anode sheet 130 and cathode sheet 230 through the stacking module 330, thereby improving the processing accuracy of the battery cell stacking, avoiding the safety hazard in the later operation caused by the misalignment of the anode sheet 130 and the cathode sheet 230 after the battery cell production is completed, and ensuring the safety of the battery cell.

[0065] Specifically, the first electrode correction module 310 includes a correction platform, a driving component and an image acquisition component, both of which are arranged on the correction platform, and the image acquisition component is electrically connected to the driving component. The conveying mechanism transports the anode sheet 130 to the correction platform, the image acquisition component performs image acquisition on the anode sheet 130 on the correction platform and analyzes the current position information of the current anode sheet 130, compares the current position information with the standard position information to obtain the position difference, and the image acquisition component transmits the position difference to the driving component, and the driving component drives the correction platform to move according to the position difference to move the anode sheet 130 to the standard position.

[0066] Furthermore, the driving member includes a first driving unit, a second driving unit and a third driving unit. The first driving unit is used to drive the correction platform to move along the X-axis direction, the second driving unit is used to drive the correction platform to move along the Y-axis direction, and the third driving unit is used to drive the correction platform to rotate to correct the angle of the anode plate 130.

[0067] It is understandable that the second pole piece correction module 320 is similar to the first pole piece correction module 310 and will not be described in detail here.

[0068] See also Figure 3In one embodiment, the conveying mechanism includes a first transport unit 410, a second transport unit 420, a third transport unit 430, a fourth transport unit 440 and a fifth transport unit 450. The first transport unit 410 is used to transport the anode sheet 130 produced by the anode feeding mechanism 100 to the first electrode sheet correction module 310, the second transport unit 420 is used to transport the anode sheet 130 located in the first electrode sheet correction module 310 after correction processing to the stacking mechanism 300, the third transport unit 430 is used to transport the cathode sheet 230 located in the feeding area 530 to the second electrode sheet correction module 320, the fourth transport unit 440 is used to transport the cathode sheet 230 located in the second electrode sheet correction module 320 after correction processing to the stacking mechanism 300, and the fifth transport unit 450 is used to transport the cathode sheet 230 produced by the cathode feeding mechanism 200 to the stacking area 510. By setting up a separate transport unit, the overall transportation efficiency of the electrode sheet is improved, thereby improving the overall production efficiency of the battery cell production line.

[0069] Specifically, the transport unit in the above embodiment can transport the cathode sheet 230 and the anode sheet 130 by setting a suction cup on the robot arm. The suction cup can absorb and grasp the cathode sheet 230 and the anode sheet 130, which will not be described in detail here.

[0070] See also Figure 1 and Figure 4 In one embodiment, the anode loading mechanism 100 includes a first feeding conveyor belt 110 and a first material making module 120, the first feeding conveyor belt 110 is arranged at the downstream section of the first material making module 120 and at the upstream section of the stacking mechanism 300, and the cathode loading mechanism 200 includes a second feeding conveyor belt 210 and a second material making module 220, the second feeding conveyor belt 210 is arranged at the downstream section of the second material making module 220 and at the upstream section of the stacking area 510.

[0071] The anode sheet 130 produced by the first material preparation module 120 can be conveyed to the upstream section of the stacking mechanism 300 through the first feeding conveyor belt 110, so that the conveying mechanism can transport the anode sheet 130 on the first feeding conveyor belt 110 to the stacking mechanism 300. The cathode sheet 230 produced by the second material preparation module 220 can be conveyed to the upstream section of the weighing mechanism 500 through the second feeding conveyor belt 210, so that the conveying mechanism can transport the cathode sheet 230 on the second feeding conveyor belt 210 to the weighing mechanism 500. The first feeding conveyor belt 110 and the second feeding conveyor belt 210 can provide more stable conveying conditions for the anode sheet 130 and the cathode sheet 230 respectively, and the first feeding conveyor belt 110 and the second feeding conveyor belt 210 can continuously transport the anode sheet 130 and the cathode sheet 230, thereby improving the overall production efficiency of the battery cell production line.

[0072] Specifically, see Figure 4 The first material preparation module 120 includes a feeding roller unit, an anode unwinding unit 121, a pole ear forming unit 122, a pole piece cutting unit 123 and a defect detection unit 124. The anode unwinding unit 121, the pole ear forming unit 122, the pole piece cutting unit 123 and the defect detection unit 124 are sequentially arranged on the feeding roller unit. The anode unwinding unit 121 unwinds the anode coil, and sends the anode coil to the pole ear forming unit 122 through the feeding roller unit. The pole ear forming unit 122 punches the anode coil to form the pole ear, and then the anode coil is cut by the pole piece cutting unit 123 to form the anode sheet 130. The defect detection unit 124 performs defect detection on the cut anode sheet 130. After passing the detection, it is transported to the first feeding conveyor belt 110 through the feeding roller unit.

[0073] Further, the defect detection unit 124 includes a pole piece fixing part, a first camera and a second camera, the pole piece fixing part is used to fix the anode piece 130, the first camera is used to shoot the front side of the anode piece 130 to detect defects on the front side of the anode piece 130, and the second camera is used to shoot the back side of the anode piece 130 to detect defects on the back side of the anode piece 130. It can be understood that the second material making module 220 is similar to the first material making module 120, and will not be repeated here.

[0074] See also Figure 1 In one embodiment, the first feeding conveyor belt 110 is arranged in parallel with the second feeding conveyor belt 210, at least two stacking mechanisms 300 are provided and are arranged at intervals along the extension direction of the first feeding conveyor belt 110, at least two weighing mechanisms 500 and conveying mechanisms are provided, and the weighing mechanisms 500 and conveying mechanisms are arranged one-to-one with the stacking mechanisms 300.

[0075] In this way, when the first feeding conveyor belt 110 conveys the anode sheet 130 in its own extension direction, at least two conveying mechanisms can sequentially transport the anode sheet 130 on the first feeding conveyor belt 110 to different stacking mechanisms 300; when the second feeding conveyor belt 210 conveys the cathode sheet 230 in its own extension direction, at least two conveying mechanisms can sequentially transport the cathode sheet 230 on the second feeding conveyor belt 210 to different weighing mechanisms 500, so that the battery cell production line can simultaneously stack at least two cathode sheets 230 and at least two anode sheets 130 to form at least two bare battery cells, thereby improving the production efficiency of the battery cell production line.

[0076] See also Figure 1In one embodiment, the battery cell production line further includes a preheating mechanism 600 and a hot pressing mechanism 700. The preheating mechanism 600 is disposed at a downstream section of the lamination mechanism 300, and is used to preheat the bare battery cells. The hot pressing mechanism 700 is disposed at a downstream section of the preheating mechanism 600, and is used to hot press the bare battery cells after the preheating treatment.

[0077] The conveying mechanism transports the bare battery cells located in the stacking mechanism 300 to the preheating mechanism 600, and then transports the preheated bare battery cells to the hot pressing mechanism 700 for hot pressing molding. The preheating mechanism 600 can preheat the bare battery cells. When the hot pressing mechanism 700 hot presses the preheated bare battery cells, the required hot pressing time is shorter, thereby reducing the total production time of the battery cells and improving the production efficiency of the battery cell production line.

[0078] Furthermore, the preheating mechanism 600 includes a first heating plate and a second heating plate, which are parallel to each other and spaced apart to form a preheating space, and the preheating space is used to accommodate the bare battery cells.

[0079] The conveying mechanism can transport the bare battery cells that have not been hot-pressed to the preheating space between the first heating plate and the second heating plate. The first heating plate and the second heating plate heat the bare battery cells in the preheating space to perform a preheating process on the bare battery cells, thereby reducing the time required for subsequent hot pressing and improving the production efficiency of the battery production line.

[0080] As a further explanation, in the conventional technology, the hot pressing mechanism 700 takes a long time to hot press the bare battery cells, and multiple hot pressing mechanisms 700 occupy a large work area in the factory, which results in a high cost of use. In the present embodiment, the bare battery cells that have not been hot pressed are preheated by the first heating plate and the second heating plate, thereby reducing the hot pressing time. Furthermore, since the first heating plate and the second heating plate occupy a small work area in the factory, a large number of work areas of the hot pressing mechanism 700 are converted into work areas of the preheating mechanism 600, which can reduce the work area occupied in the factory, improve the space utilization rate of the factory, and thereby reduce the production cost of the battery cells.

[0081] Specifically, the first heating plate and the second heating plate can be close to or far away from each other. When the bare battery cell is located in the preheating space, the first heating plate and the second heating plate are close to each other and squeeze the bare battery cell in the preheating space. The first heating plate and the second heating plate heat the bare battery cell to perform a preheating process on the bare battery cell. After the preheating is completed, the first heating plate and the second heating plate are far away from each other to facilitate the removal of the preheated bare battery cell.

[0082] In one embodiment, the battery cell production line further includes a gluing mechanism 800 , which is disposed at a downstream section of the lamination mechanism 300 and an upstream section of the preheating mechanism 600 , and is used to perform gluing treatment on the bare battery cells.

[0083] The gluing mechanism 800 can glue the bare cells after lamination, and the conveying mechanism then transports the glued bare cells to the preheating mechanism 600 for preheating. After preheating, the bare cells are transported to the hot pressing mechanism 700 through the conveying mechanism for hot pressing to improve the production efficiency of the cell production line.

[0084] See also Figure 1 In one embodiment, the conveying mechanism includes a pallet 460, a first manipulator, a second manipulator, a third manipulator and a reflow conveyor belt 470. The pallet 460 is used to carry the bare battery cell. The first manipulator transports the bare battery cell that is located in the gluing mechanism 800 and has completed gluing to the pallet 460. The second manipulator transports the pallet 460 carrying the bare battery cell to the preheating mechanism 600 to preheat the bare battery cell. After the preheating is completed, the second manipulator transports the pallet 460 carrying the bare battery cell to the hot pressing mechanism 700 to perform hot pressing molding on the bare battery cell. The third manipulator separates the hot pressed battery cell from the pallet 460, and the molded battery cell is transported to After unloading is completed at the unloading station, the pallet 460 is transported to the reflux conveyor belt 470, and the reflux conveyor belt 470 transports the pallet 460 to one side of the gluing mechanism 800. The first manipulator transports the bare battery cells that are located in the gluing mechanism 800 and have completed gluing to the pallet 460 again, and so on. The bare battery cells on the pallet 460 are transported by the manipulator by clamping the pallet 460, which can prevent damage to the bare battery cells. In addition, by setting up the reflux conveyor belt 470, the pallet 460 can be quickly reflowed to facilitate the next round of battery cell production on the battery cell production line. The layout is compact and reasonable, which improves production efficiency while reducing production costs.

[0085] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0086] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A battery cell production line, characterized in that: include: An anode feeding mechanism, wherein the anode feeding mechanism is used to produce anode sheets; A cathode feeding mechanism, wherein the cathode feeding mechanism is used to produce cathode sheets; A lamination mechanism, which is arranged at a downstream section of the anode feeding mechanism and at a downstream section of the cathode feeding mechanism, and is used to laminate the anode sheet and the cathode sheet to form a bare cell; A weighing mechanism, wherein the weighing mechanism has a stacking area, a weighing area and a feeding area, the stacking area is arranged at a downstream section of the cathode feeding mechanism, the weighing area is arranged at a downstream section of the stacking area, the feeding area is arranged at a downstream section of the weighing area and at an upstream section of the lamination mechanism; and The conveying mechanism is used to convey the pole pieces between the mechanisms.

2. The battery cell production line according to claim 1, characterized in that: The weighing mechanism also includes at least three material boxes, a first transfer module and a second transfer module, the material boxes are used to carry the cathode sheets, at least one of the material boxes is located in the material stacking area, at least one of the material boxes is located in the weighing area, and at least one of the material boxes is located in the loading area. The first transfer module is used to transfer the material box located in the weighing area to the loading area. The first transfer module is also used to transfer the material box located in the material stacking area to the weighing area. The second transfer module is used to transfer the material box located in the loading area to the material stacking area.

3. The battery cell production line according to claim 2, characterized in that: The first transfer module includes a first clamp, a second clamp and a first movable arm, the first clamp and the second clamp are both arranged on the first movable arm, the direction of the stacking area toward the loading area is set as the first direction, the first movable arm can reciprocate along the first direction, the first clamp is used to clamp the material box located in the weighing area and release the material box in the loading area, the second clamp is used to clamp the material box located in the stacking area and release the material box in the weighing area.

4. The battery cell production line according to claim 3, characterized in that: The second transfer module includes a third clamp and a second movable arm, the third clamp is arranged on the second movable arm, the second movable arm can reciprocate along the first direction, the moving trajectory of the second movable arm is staggered with the moving trajectory of the first movable arm, and the third clamp is used to clamp the material box located in the loading area and release the material box in the stacking area.

5. The battery cell production line according to claim 1, characterized in that: The lamination mechanism comprises a first pole piece correction module, a second pole piece correction module and a lamination module. The first pole piece correction module is arranged at the downstream section of the anode feeding mechanism and at the upstream section of the lamination module. The second pole piece correction module is arranged at the downstream section of the feeding area and located at the upstream section of the lamination module.

6. The battery cell production line according to claim 1, characterized in that: The anode feeding mechanism includes a first feeding conveyor belt and a first material making module, the first feeding conveyor belt is arranged at the downstream section of the first material making module and at the upstream section of the stacking mechanism, and the cathode feeding mechanism includes a second feeding conveyor belt and a second material making module, the second feeding conveyor belt is arranged at the downstream section of the second material making module and at the upstream section of the stacking area.

7. The battery cell production line according to claim 6, characterized in that: The first feeding conveyor belt is arranged in parallel with the second feeding conveyor belt, the stacking mechanisms are provided with at least two and are arranged at intervals along the extension direction of the first feeding conveyor belt, the weighing mechanisms and the conveying mechanisms are each provided with at least two, and the weighing mechanisms and the conveying mechanisms are arranged one-to-one with the stacking mechanisms.

8. The battery cell production line according to claim 1, characterized in that: The battery cell production line also includes a preheating mechanism and a hot pressing mechanism. The preheating mechanism is arranged at the downstream section of the lamination mechanism, and is used to preheat the bare battery cells. The hot pressing mechanism is arranged at the downstream section of the preheating mechanism, and is used to hot press the bare battery cells after the preheating treatment.

9. The battery cell production line according to claim 8, characterized in that: The preheating mechanism comprises a first heating plate and a second heating plate, wherein the first heating plate and the second heating plate are parallel to each other and spaced apart to form a preheating space, and the preheating space is used to accommodate the bare battery cell.

10. The battery cell production line according to claim 8, characterized in that: The battery cell production line further includes a gluing mechanism, which is disposed at a downstream section of the lamination mechanism and at an upstream section of the preheating mechanism, and is used for performing a gluing process on the bare battery cells.

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