Naked battery cell, naked battery cell production equipment and battery production line

Abstract

The utility model relates to the technical field of battery production equipment, and discloses a naked battery cell, naked battery cell production equipment and a battery production line. The naked battery cell production equipment comprises a screening mechanism, the screening mechanism comprises a screening structure, a first discharging port and a second discharging port, the screening structure is used for detecting and judging whether the weight parameter of a naked battery cell is qualified or not, when the weight parameter of the naked battery cell is qualified, the naked battery cell is output to the first discharging port, and when the weight parameter of the naked battery cell is unqualified, the naked battery cell is output to the second discharging port. And the naked battery cell is output to the second discharge port. By applying the technical scheme, the problem of poor battery capacity consistency between the battery monomers assembled and formed by different naked battery cells in batch naked battery cells of the same model is solved but not limited to the problem of the battery capacity consistency between the battery monomers assembled and formed by the different naked battery cells in batch naked battery cells of the same model.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of battery production equipment, and particularly relates to a bare battery cell, a bare battery cell production device and a battery production line. BACKGROUND

[0002] At present, the production process of the bare battery cell in the related art mainly focuses on how to accurately adjust the dislocation of the cathode tabs and the anode tabs to realize accurate die cutting of the cathode tabs and the anode tabs, and then to adjust the accuracy of winding, that is, how to realize good and accurate winding of the bare battery cell. However, the production process of the bare battery cell in the related art ignores the quality control of the consistency of the battery cell performance, especially the quality control of the consistency of the battery capacity of the battery monomer formed by assembling the bare battery cell. This leads to the difference in the battery capacity between the battery monomers formed by assembling different bare battery cells in the same type of batch bare battery cells, and the difference exceeds the design allowable error range. CONTENT OF THE UTILITY MODEL

[0003] The purpose of the application is to provide a bare battery cell, a bare battery cell production device and a battery production line, which can solve the problem of the inconsistency of the battery capacity between the battery monomers formed by assembling different bare battery cells in the same type of batch bare battery cells.

[0004] To achieve the above-mentioned purpose, according to the first aspect of the embodiment of the application, a bare battery cell production device is provided, which comprises:

[0005] The screening mechanism comprises a screening structure, a first discharge port and a second discharge port. The screening structure is used to detect and judge whether the weight parameter of the bare battery cell is qualified. When the weight parameter of the bare battery cell is qualified, the bare battery cell is output to the first discharge port. When the weight parameter of the bare battery cell is not qualified, the bare battery cell is output to the second discharge port.

[0006] The bare battery cell production device provided by the embodiment of the application is applied to the production and manufacturing of the bare battery cell, and the bare battery cell produced is applied to the assembly and formation of the battery monomer. The bare battery cell is detected and judged by the screening mechanism to determine whether the weight parameter of the bare battery cell is qualified, and then the bare battery cell with the qualified weight parameter is screened out, so that the batch bare battery cell with the qualified weight parameter is finally output from the first discharge port, and the bare battery cell with the unqualified weight parameter is output from the second discharge port and recycled. In this way, the same type of batch bare battery cell with high consistency of the weight parameter is produced and manufactured, and these bare battery cells are applied to the assembly and formation of the battery monomer, so that the battery capacity consistency of these battery monomers is high.

[0007] In some embodiments of the present application, the screening structure includes a control device, a weighing device, a first conveying device and a second conveying device, the control device is electrically connected with the weighing device, the first conveying device and the second conveying device, the weighing device is used to detect the weight parameter of the bare battery cell, the first conveying device is correspondingly arranged with the first discharge port to convey the bare battery cell with qualified weight parameter to the first discharge port, and the second conveying device is correspondingly arranged with the second discharge port to convey the bare battery cell with unqualified weight parameter to the second discharge port. Based on the relationship between the weight parameter of the bare battery cell and the battery capacity of the battery cell assembled by using the bare battery cell, the bare battery cell wound and formed is distinguished, so that the same type of batch bare battery cells with high consistency of weight parameters are finally obtained, thereby improving the consistency of the battery capacity of the battery cell assembled by using the bare battery cells and improving the quality of the battery cell.

[0008] In some embodiments of the present application, the bare battery cell production equipment further includes a die-cutting mechanism and a feedback system, the die-cutting mechanism is used to die-cut the material belt into the pole piece, the die-cutting mechanism includes a cutting device, and the feedback system is electrically connected with the control device and the cutting device. The material belt is input from the feeding port of the die-cutting mechanism, and the material belt is subjected to a die-cutting process by the die-cuting mechanism, a winding process by the winding mechanism and a screening process by the screening mechanism in the bare battery cell production equipment to form the bare battery cell. The feedback system controls the cutting device to adjust the weight of the next bare battery cell wound and formed according to the weighing result of the current bare battery cell as the reference data, that is, to adjust the weight parameter of the next bare battery cell, so as to reduce the number of bare battery cells with unqualified weight parameters and improve the yield of the bare battery cells.

[0009] In some embodiments of the present application, the bare battery cell production equipment further includes a winding mechanism and a shaping mechanism. The winding mechanism is used to wind and form the pole piece into the bare battery cell, and the screening mechanism further includes a screening inlet connected with the discharge port of the winding mechanism, and the shaping mechanism is arranged between the winding mechanism and the screening mechanism. The winding and formed bare battery cell is clamped and shaped by the shaping structure, so that all the bare battery cells meet the density requirement.

[0010] In some embodiments of the present application, the bare battery cell production equipment further includes a shaping mechanism arranged downstream of the first discharge port, so that the bare battery cell with qualified weight parameter meets the density requirement.

[0011] In some embodiments of the present application, the shaping mechanism includes a hot-pressing device, the hot-pressing device includes a shaping press plate and a heating structure, and the heating structure is arranged on the shaping press plate. The hot-pressing device integrates the two steps of heating the bare battery cell and clamping and shaping the bare battery cell, reduces the component structure of the bare battery cell production equipment, and reduces the overall volume of the bare battery cell production all-in-one machine, which is beneficial to reducing the floor space of the bare battery cell production equipment.

[0012] In some embodiments of the present application, the shaping mechanism comprises a tunnel furnace and a cold press arranged in sequence, the tunnel furnace is used to heat the bare battery cell, which is conducive to controlling the heating degree of the bare battery cell and preventing the bare battery cell from being overheated, and the cold press comprises a shaping press plate, which clamps and shapes the bare battery cell output from the tunnel furnace. In the clamping and shaping process, some heat of the bare battery cell is absorbed, which helps to shorten the cooling time of the bare battery cell after pressure shaping.

[0013] In some embodiments of the present application, the shaping mechanism comprises a heating power supply and a cold press, the positive and negative terminals of the heating power supply are respectively electrically connected with two cathode tabs and / or two anode tabs of the bare battery cell, and the cold press comprises a shaping press plate, which clamps and shapes the heated bare battery cell. The bare battery cell is rapidly and uniformly heated as a whole, the heating efficiency is higher, the energy utilization rate is relatively higher, and the heating uniformity is better.

[0014] According to a second aspect of the embodiments of the present application, a bare battery cell is provided, wherein the bare battery cell is manufactured by the bare battery cell manufacturing device as described above.

[0015] According to a third aspect of the embodiments of the present application, a battery production line is provided, wherein the battery production line comprises the bare battery cell manufacturing device as described above, and the bare battery cell is manufactured by the bare battery cell manufacturing device, which helps to improve the overall production efficiency of the battery manufacturing. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0017] Figure 1 is a top view of the cathode sheet of the embodiment of the present application;

[0018] Figure 2 is a Figure 1 is a sectional view in the A-A direction;

[0019] Figure 3 is a top view of the bare battery cell of the embodiment of the present application;

[0020] Figure 4 is a structural block diagram of a bare battery cell manufacturing device of the embodiment of the present application;

[0021] Figure 5 is a structural block diagram of another bare battery cell manufacturing device of the embodiment of the present application;

[0022] Figure 6 A structural block diagram of still another bare cell production equipment according to an embodiment of the present application;

[0023] Figure 7 A structural block diagram of still another bare cell production equipment according to an embodiment of the present application;

[0024] Figure 8 A structural diagram of a shaping mechanism of the bare cell production equipment according to an embodiment of the present application, wherein the shaping mechanism comprises a hot pressing device;

[0025] Figure 9 A structural diagram of another shaping mechanism of the bare cell production equipment according to an embodiment of the present application, wherein the shaping mechanism comprises a tunnel furnace and a cold pressing machine;

[0026] Figure 10 A logic block diagram of a preparation method of a bare cell according to an embodiment of the present application;

[0027] Figure 11 A logic block diagram of another preparation method of a bare cell according to an embodiment of the present application;

[0028] Figure 12 A logic block diagram of still another preparation method of a bare cell according to an embodiment of the present application;

[0029] Figure 13 A logic block diagram of still another preparation method of a bare cell according to an embodiment of the present application.

[0030] In the drawings, the reference signs are as follows:

[0031] 10, die cutting mechanism; 11, feeding port; 12, die cutting unit; 121, cutting device; 13, die cutting discharge port;

[0032] 20, winding mechanism; 21, winding inlet; 22, winding unit; 23, winding discharge port;

[0033] 30, screening mechanism; 31, screening inlet; 32, screening structure; 321, control device; 322, weighing device; 323, first conveying device; 324, second conveying device; 33, first discharge port; 34, second discharge port;

[0034] 40, feedback system;

[0035] 50, shaping mechanism; 51, hot pressing device; 52, shaping pressing plate; 521, first pressing plate; 522, second pressing plate; 53, heating structure; 54, tunnel furnace; 55, cold pressing machine;

[0036] 100, tab; 110, cathode tab; 120, anode tab; 130, cathode tab; 140, anode tab; 150, cathode active material; 160, tab base;

[0037] 200, bare cell;

[0038] 301, first separator; 302, second separator. DETAILED DESCRIPTION

[0039] Embodiments of the present application are described below in detail with reference to the accompanying drawings, in which examples of the embodiments are shown, wherein the same or similar notations are used to denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the accompanying drawings are exemplary, and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0040] In the description of the present application, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0041] In addition, the terms "first", "second", and the like are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second", and the like can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0042] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0043] At present, from the development of market situation, the application of power battery (the power battery includes but is not limited to lithium battery, sodium battery and the like) is more and more extensive. The power battery is not only applied to the energy storage power supply system of hydropower, thermal power, wind power and solar power station, but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, and police equipment, military equipment and aerospace and other fields. With the continuous expansion of the application field of power battery, the market demand is also increasing. And the quality requirements of users for power battery are also increasing, and the quality of power battery is reflected in many aspects, including but not limited to long service life, high safety in use, strong power storage endurance and the like.

[0044] For the power storage endurance of the power battery, users often pay attention to the key reference data of battery capacity. The minimum complete unit of output electric energy in the power battery is the battery monomer, and the battery capacity of the battery monomer is closely related to the weight parameter of the bare cell. However, the current production process of the bare cell ignores the quality control of the consistency of the cell performance, especially the quality control of the consistency of the battery capacity of the battery monomer assembled from the bare cell. This leads to the difference between the battery capacities of the battery monomers assembled from different bare cells of the same type of batch bare cells, and the difference exceeds the design allowable error range, that is, the consistency of the battery capacity of the battery monomer is poor.

[0045] Based on the above consideration, in order to solve the problem of poor consistency of the battery capacity between the battery monomers assembled from different bare cells of the same type of batch bare cells in the current production of the bare cell, the embodiments of the present application provide a bare cell production equipment, and the bare cell production equipment is applied to the battery production line to manufacture the bare cell. Among them, the wound bare cell is detected and judged by the screening mechanism whether the weight parameter of the bare cell is qualified, and then the bare cell with qualified weight parameter is screened out, and the same type of batch bare cell with high weight parameter consistency is obtained. And the bare cell with unqualified weight parameter is output from the second discharge port and recycled. Correspondingly, the embodiments of the present application also provide a preparation method of the bare cell, so as to improve the weight parameter consistency of the bare cell, and the manufactured bare cell is applied to the assembled battery monomer, so as to improve the consistency of the battery capacity of the battery monomer.

[0046] In order to illustrate the technical solutions provided by the present application, the following will be described in detail in combination with specific drawings and embodiments.

[0047] According to the first aspect of the embodiments of the present application, a bare cell production equipment is provided. As Figure 4As shown, the bare cell production device includes a die-cutting mechanism 10, a winding mechanism 20, and a screening mechanism 30. The die-cutting mechanism 10 includes a feeding port 11, a die-cutting unit 12, and a die-cutting discharge port 13, the die-cutting unit 12 is used for die-cutting the material belt input from the feeding port 11 into the pole piece 100, the pole piece 100 is output from the die-cutting discharge port 13 and delivered to the winding mechanism 20. The winding mechanism 20 includes a winding inlet 21, a winding unit 22, and a winding discharge port 23, the winding inlet 21 is connected with the die-cutting discharge port 13, the winding unit 22 is used for winding the pole piece 100 into the bare cell 200, the bare cell 200 is output from the winding discharge port 23 and delivered to the screening mechanism 30. The screening mechanism 30 includes a screening inlet 31, a screening structure 32, a first discharge port 33, and a second discharge port 34, the screening inlet 31 is connected with the winding discharge port 23, the screening structure 32 is used for detecting and judging whether the weight parameter of the bare cell 200 is qualified, when the weight parameter of the bare cell 200 is qualified, the bare cell 200 is output to the first discharge port 33, when the weight parameter of the bare cell 200 is not qualified, the bare cell 200 is output to the second discharge port 34.

[0048] The bare cell production device provided by the embodiment of the present application is applied to the production and manufacturing of the bare cell 200, and the produced bare cell 200 is applied to the assembly and formation of the battery monomer. The material belt is input from the feeding port 11 of the die-cutting mechanism 10, the material belt is subjected to the die-cutting process in the die-cutting mechanism 10, the winding process in the winding mechanism 20, and the screening process in the screening mechanism 30, the wound bare cell 200 is detected and judged by the screening mechanism 30 whether the weight parameter of the bare cell 200 is qualified, and then the bare cell 200 with the qualified weight parameter is screened out, so that the batch of bare cells 200 with the qualified weight parameter is finally output from the first discharge port 33, and the screened bare cell 200 with the unqualified weight parameter is output from the second discharge port 34 and recycled. In this way, the batch of bare cells 200 of the same model with high weight parameter consistency are produced and manufactured, and these bare cells 200 are applied to the assembly and formation of the battery monomer, so that the battery capacity of these battery monomers is relatively high.

[0049] Among them:

[0050] The die-cutting process refers to cutting the material belt to form the tab, that is, cutting the cathode material belt to form the cathode tab 130 to form the cathode piece 110, and cutting the anode material belt to form the anode tab 140 to form the anode piece 120.

[0051] The winding process refers to winding the pole piece 100 (including the cathode piece 110 and the anode piece 120) and the separator (including the first separator 301 and the second separator 302) to form the bare cell 200, at this time the bare cell 200 is a semi-finished product.

[0052] The screening process refers to detecting and judging whether the weight parameter of the wound bare battery cell 200 is qualified, so as to screen out the bare battery cell 200 with qualified weight parameter.

[0053] As shown in Figure 3 and Figure 8 , the bare battery cell 200 is wound and formed by sequentially stacking the first diaphragm 301, the cathode sheet 110, the second diaphragm 302 and the anode sheet 120. As shown in Figure 1 and Figure 2 , the cathode active material 150 is coated on the sheet base body 160 of the cathode sheet 110, and the anode active material is coated on the sheet base body 160 of the anode sheet 120.

[0054] When the bare battery cell 200 is assembled into a battery monomer, the battery capacity of the battery monomer is actually largely dependent on the amount of cathode active material 150 on the cathode sheet 110 and the amount of anode active material on the anode sheet 120, so the battery capacity of the battery monomer is also largely dependent on the weight of the bare battery cell 200. Generally, the cathode active material 150 is considered to be uniformly coated on the sheet base body 160 of the cathode sheet 110, and the anode active material is considered to be uniformly coated on the sheet base body 160 of the anode sheet 120.

[0055] The weight of the bare battery cell 200 is derived from the sum of the weights of the cathode sheet 110, the cathode active material 150, the anode sheet 120, the anode active material, the first separator 301 and the second separator 302. The weights of the first separator 301 and the second separator 302 have a small weight ratio and have little effect on the total weight of the wound bare battery cell 200. The two main factors affecting the weight of the wound bare battery cell 200 are the area of the cathode sheet 110 and the anode sheet 120 and the coating weight of the cathode active material 150 and the anode active material. For a bare battery cell of a given model, the width error of the electrode sheet is also very small. Furthermore, in the case where the lengths of the cathode sheet 110 and the anode sheet 120 are substantially constant (in a batch of bare battery cells of the same model, there can be a length difference of a few millimeters to tens of millimeters between the cathode sheets 110 and / or between the anode sheets 120 of different bare battery cells 200, but in the weight difference caused by these length differences, the proportion of the electrode sheet substrate 160 is small, and the main source of the weight difference is the cathode active material 150 and / or the anode active material in these length differences), the weight difference of the wound bare battery cell 200 is derived from the coating weight difference of the cathode active material 150 on the electrode sheet substrate 160 of the cathode sheet 110 and the anode active material on the electrode sheet substrate 160 of the anode sheet 120 (affecting the weight parameter). It can be seen that adjusting the length of the cathode sheet 110 is equivalent to adjusting the weight of the cathode active material 150 on the electrode sheet substrate 160 of the cathode sheet 110 in the same proportion, adjusting the length of the anode sheet 120 is equivalent to adjusting the weight of the anode active material on the electrode sheet substrate 160 of the anode sheet 120 in the same proportion, and finally equivalent to adjusting the weight of the bare battery cell 200 in the same proportion.

[0056] Based on the relationship between the weight of the bare battery cell 200 and the battery capacity of the battery cell assembled using the bare battery cell 200, in some embodiments of the present application, as shown in Figure 5 The screening structure 32 includes a weighing device 322, which weighs the wound bare battery cell 200 to determine whether the weight parameter of the bare battery cell 200 is qualified according to the weight of the bare battery cell 200. As shown in Figure 5As shown, the screening structure 32 further comprises a control device 321, a first conveying device 323 and a second conveying device 324, and the control device 321 is electrically connected with the weighing device 322, the first conveying device 323 and the second conveying device 324. Thus, when the weighing device 322 weighs the bare battery cell 200 to obtain the weight of the bare battery cell 200, the weighing device 322 sends a weighing result signal of the bare battery cell 200 to the control device 321, and then the control device 321 controls the first conveying device 323 or the second conveying device 324 according to the received weighing result signal sent by the weighing device 322. The first conveying device 323 is arranged corresponding to the first discharge port 33, and the second conveying device 324 is arranged corresponding to the second discharge port 34. When the weighing result signal received by the control device 321 is that the weight parameter of the bare battery cell 200 is qualified, the control device 321 controls the first conveying device 323 to convey the bare battery cell 200 with the qualified weight parameter to the first discharge port 33; when the weighing result signal received by the control device 321 is that the weight parameter of the bare battery cell 200 is unqualified, the control device 321 controls the second conveying device 324 to convey the bare battery cell 200 with the unqualified weight parameter to the second discharge port 34. In this way, the bare battery cell 200 output from the winding discharge port 23 of the winding mechanism 20 is detected and judged by the screening mechanism 30 whether the weight parameter of the bare battery cell 200 is qualified, and then the first conveying device 323 is controlled to output the bare battery cell 200 with the qualified weight parameter from the first discharge port 33, or the second conveying device 324 is controlled to output the bare battery cell 200 with the unqualified weight parameter from the second discharge port 34, so as to realize the differentiation of the wound bare battery cell 200, so as to finally obtain the same model batch of bare battery cells 200 with high weight parameter consistency, improve the consistency of the battery capacity of the battery monomer assembled by using these bare battery cells 200, and improve the quality of the battery monomer.

[0057] Although the cathode active material 150 is considered to be uniformly coated on the pole piece substrate 160 of the cathode sheet 110, and the anode active material is considered to be uniformly coated on the pole piece substrate 160 of the anode sheet 120, in fact, the cathode active material 150 coated on the pole piece substrate 160 of the cathode sheet 110 is unevenly coated along the coating direction, and the anode active material coated on the pole piece substrate 160 of the anode sheet 120 is unevenly coated along the coating direction. In this way, among different bare battery cells 200 of the same model, if the length of the cathode sheet 110 and the anode sheet 120 of the bare battery cell 200 is always unchanged, then the weight of different bare battery cells 200 will always fluctuate, that is, the weight parameter of different bare battery cells 200 will always fluctuate. In order to reduce the number of bare battery cells 200 with unqualified weight parameters and improve the yield of bare battery cells 200, the screening structure 32 is arranged to screen the weight parameter of the bare battery cell 200, so as to realize the differentiation of the wound bare battery cell 200, so as to finally obtain the same model batch of bare battery cells 200 with high weight parameter consistency, improve the consistency of the battery capacity of the battery monomer assembled by using these bare battery cells 200, and improve the quality of the battery monomer. Figure 4 to Figure 7 、 Figure 9As shown, in some embodiments of the present application, the bare cell production device further comprises a feedback system 40, the die cutting unit 12 comprises a cutting device 121, and the feedback system 40 is electrically connected with the control device 321 and the cutting device 121. In this way, when the control device 321 receives the weighing result signal sent by the weighing device 322, the control device 321 transmits the weighing result signal to the feedback system 40 while controlling the first conveying device 323 or the second conveying device 324 to be started. Moreover, when the feedback system 40 receives the weighing result signal, the feedback system 40 compares and calculates the weighing result signal with the design data of the bare cell 200 preset in the feedback system 40, and then calculates the required new length of the cathode sheet 110 and / or the anode sheet 120. Then, the feedback system 40 controls the cutting device 121 to adjust the cutting length of the cathode sheet 110 and / or the anode sheet 120, that is, to adjust the weight of the next bare cell 200 wound and formed, that is, to adjust the weight parameter of the next bare cell 200, so as to reduce the number of bare cells 200 with unqualified weight parameters and improve the yield of the bare cells 200.

[0058] The design data of the bare cell 200 preset in the feedback system includes but is not limited to the overall weight size range of the bare cell 200, the length size range of the cathode sheet 110, the length size range of the anode sheet 120, etc.

[0059] The winding machine unit 22 winds the die-cut formed sheet 100 into a bare cell 200. The bare cell 200 is preliminarily formed, but the inside of the bare cell 200 is still fluffy, the shape profile of the bare cell 200 is not fixed, that is, the cathode sheet 110, the anode sheet 120, the first separator 301 and the second separator 302 inside the bare cell 200 are not dense, at this time, the volume of the bare cell 200 is relatively large, and the relative position between the cathode sheet 110 and the anode sheet 120 in the bare cell 200 is easy to slip and not easy to be correctly assembled into the battery shell, and is not suitable for being directly applied to device production batteries. In order to make the bare cell 200 meet the density requirement, the wound and formed bare cell 200 needs to be clamped and shaped, and the bare cell production device further comprises a shaping mechanism 50, which clamps and shapes the wound and formed bare cell 200, so as to make the bare cell 200 meet the density requirement.

[0060] In some embodiments of the present application, as Figure 6As shown, the shaping mechanism 50 of the bare battery cell production equipment is located between the winding mechanism 20 and the screening mechanism 30. In this embodiment, after the wound bare battery cells 200 are output from the winding outlet 23 and before they are fed into the screening mechanism 30 from the screening inlet 31, the shaping mechanism 50 clamps and shapes all the wound bare battery cells 200 to achieve the required density. All the clamped and shaped bare battery cells 200 are then sequentially fed into the screening mechanism 30 for screening, resulting in a batch of bare battery cells 200 of the same model with high consistency in weight parameters.

[0061] In other embodiments of this application, such as Figure 7 As shown, the shaping mechanism 50 of the bare cell production equipment is located downstream of the first discharge port 33. In this embodiment, after the wound bare cells 200 are detected and determined to be qualified in terms of weight parameters and are output from the first discharge port 33, bare cells 200 with high consistency in weight parameters are then clamped and shaped by the shaping mechanism 50 to achieve the required density. Bare cells 200 output from the second discharge port 34 whose weight parameters are determined to be unqualified do not require clamping and shaping; these unqualified bare cells 200 are directly recycled.

[0062] The bare cell production equipment employs a hot-pressing forming process to clamp and shape the coiled, fluffy bare cell 200. The hot-pressing forming process includes, but is not limited to: heating the fluffy bare cell structure in a preheated tunnel furnace, then transferring the heated bare cell structure to a pressure plate for clamping and shaping; or, heating the pressure plate to a high temperature, transferring heat to the fluffy bare cell structure through the pressure plate to heat the bare cell structure, and then applying pressure to clamp the heated bare cell structure to achieve hot-pressing forming.

[0063] like Figure 8 As shown, in some embodiments of this application, the shaping mechanism 50 includes a hot pressing device 51, which performs one-stop hot pressing shaping on the fluffy bare battery cell 200. The hot pressing device 51 includes a shaping pressure plate 52 and a heating structure 53, wherein the heating structure 53 is disposed on the shaping pressure plate 52, wherein, as... Figure 8As shown, the shaping presser plate 52 includes a first presser plate 521 and a second presser plate 522, the first presser plate 521 and the second presser plate 522 are arranged in an up-down interval, and the first presser plate 521 and the second presser plate 522 are both provided with a heating structure 53. That is, in the hot-pressing device 51, the shaping presser plate 52 will first contact the bare battery cell 200 without pressure, the shaping presser plate 52 heated by the heating structure 53 transmits heat to the bare battery cell 200, thereby heating the bare battery cell 200, and then the shaping presser plate 52 applies pressure to the heated bare battery cell 200 for clamping and shaping. The hot-pressing device 51 used in this embodiment integrates the two steps of heating the bare battery cell 200 and clamping and shaping the bare battery cell 200, reduces the composition structure of the bare battery cell production equipment, and reduces the overall volume of the bare battery cell production all-in-one machine, which is beneficial to reduce the floor space of the bare battery cell production equipment, thereby releasing the effective space of the production workshop and improving the effective utilization rate of the space of the production workshop.

[0064] As shown in the drawings, Figure 9 In some embodiments of the present application, the shaping mechanism 50 includes a tunnel furnace 54 and a cold press 55 arranged in sequence, the tunnel furnace 54 is used for heating the bare battery cell 200, and the cold press 55 includes a shaping presser plate 52, which clamps and shapes the bare battery cell 200 output from the tunnel furnace 54. In this embodiment, the fluffy bare battery cell 200 is first heated by the tunnel furnace 54, and then the heated fluffy bare battery cell 200 is clamped and shaped by the cold press 55, that is, the two steps of heating the bare battery cell 200 and clamping and shaping the bare battery cell 200 are performed separately. Among them, the tunnel furnace 54 heats the bare battery cell 200, which is beneficial to control the heating degree of the bare battery cell 200 and prevent the bare battery cell 200 from being overheated, thereby protecting the integrity of the bare battery cell 200, and the shaping presser plate 52 is specially used for clamping and shaping the heated bare battery cell 200, and absorbs some heat of the bare battery cell 200 during the clamping and shaping process, which helps to shorten the cooling time of the bare battery cell 200 after clamping and shaping.

[0065] In some embodiments of the present application, the shaping mechanism 50 comprises a heating power supply (not shown) and a cold press 55, and the bare battery cell 200 is heated by the ohmic heat generated by the current passing through the bare battery cell 200 itself, and then the heated bare battery cell 200 is clamped and shaped by the cold press 55. When the fluffy bare battery cell 200 is clamped and shaped, the positive and negative terminals of the heating power supply are respectively electrically connected to two of the cathode tabs 130 of the cathode sheet 110 of the bare battery cell 200 and / or two of the anode tabs 140 of the anode sheet 120 of the bare battery cell 200, so as to heat the bare battery cell 200 itself, and then the heated bare battery cell 200 is clamped and shaped by the shaping press plate 52 of the cold press 55. Among them, it can be that only by electrically connecting the cathode tabs 130 to the heating power supply, so that the cathode sheet 110 generates ohmic heat when the cathode sheet 110 overflows, and since the cathode sheet 110, the separator (including the first separator 301 and the second separator 302) and the anode sheet 120 are in close contact in the bare battery cell 200, the ohmic heat generated by the cathode sheet 110 can quickly transfer heat to the separator and the anode sheet 120, so that the whole bare battery cell 200 is quickly and uniformly heated, and the energy utilization rate is high. It can also be that only by electrically connecting the anode tabs 140 to the heating power supply, so that the anode sheet 120 generates ohmic heat when the anode sheet 120 overflows, and since the cathode sheet 110, the separator and the anode sheet 120 are in close contact in the bare battery cell 200, the ohmic heat generated by the anode sheet 120 can quickly transfer heat to the separator and the cathode sheet 110, so that the whole bare battery cell 200 is quickly and uniformly heated, and the energy utilization rate is high. It can also be that the cathode tabs 130 and the anode tabs 140 are both electrically connected to the heating power supply, so that the cathode sheet 110 and the anode sheet 120 both generate ohmic heat when they overflow, so that the whole bare battery cell 200 is quickly and uniformly heated, the heating efficiency is higher, the energy utilization rate is relatively higher, and the heating uniformity is better.

[0066] "Cathode sheet 110 overflows to generate ohmic heat" and "anode sheet 120 overflows to generate ohmic heat" refer to that the cathode sheet 110 and the anode sheet 120 themselves have ohmic resistance, and the cathode sheet 110 and the anode sheet 120 can be used as resistance heating devices. By electrically connecting the cathode sheet 110 to the positive and negative terminals of the heating power supply to form a loop, and by electrically connecting the anode sheet 120 to the positive and negative terminals of the heating power supply to form another loop, when the loop current is generated, the current passes through the cathode sheet 110 and the anode sheet 120, and the cathode sheet 110 and the anode sheet 120 generate ohmic heat.

[0067] Ohmic heat: According to Ohm's law, when current passes through a conductor, heat is generated in the conductor due to the resistance of the conductor. Moreover, the ohmic heat, i.e. the heat generated in the conductor, is proportional to the resistance of the conductor, the intensity of the current passing through, and the time of the current passing through, and the calculation formula is: Q=I2 Q = I * R * t, wherein, Q represents the generated heat (unit: Joule), I represents the intensity of the current (unit: ampere), R represents the resistance size of the conductor (unit: ohm), and t represents the time of the current passing (unit: second).

[0068] According to a second aspect of the embodiments of the present application, a bare battery cell is provided. Wherein, the bare battery cell is manufactured by the bare battery cell production device as described above.

[0069] According to a third aspect of the embodiments of the present application, a battery production line is provided. Wherein, the battery production line comprises the bare battery cell production device as described above.

[0070] In the battery production line, the bare battery cell production device provided by the embodiments of the present application is applied to produce the bare battery cell 200, and the produced bare battery cell 200 is applied to assemble the battery cell. The material belt is input from the feeding port 11 of the die-cutting mechanism 10, and the material belt is subjected to the die-cutting process by the die-cutting mechanism 10, the winding process by the winding mechanism 20, and the screening process by the screening mechanism 30 in the bare battery cell production device. The wound bare battery cell 200 is detected and judged by the screening mechanism 30 to determine whether the weight parameter of the bare battery cell 200 is qualified, and then the bare battery cell 200 with the qualified weight parameter is screened out. Thus, the batch of bare battery cells 200 of the same model with high weight parameter consistency are finally output from the first discharge port 33, and the bare battery cells 200 with unqualified weight parameter are output from the second discharge port 34 and recycled. In this way, the batch of bare battery cells 200 of the same model with high weight parameter consistency are produced, the production efficiency of the bare battery cell 200 is improved, and the bare battery cells 200 are applied to assemble the battery cell. Thus, the battery capacity of the battery cell is consistent and high.

[0071] According to a fourth aspect of the embodiments of the present application, a preparation method of a bare battery cell is provided. Wherein, as Figure 10 the preparation method of the bare battery cell comprises:

[0072] S10: die-cutting the material belt into the pole piece 100, i.e. performing the die-cutting process on the material belt, so as to obtain the required cathode piece 110 and anode piece 120;

[0073] S20: winding the pole piece 100 into the bare battery cell 200, i.e. performing the winding process on the obtained cathode piece 110, anode piece 120 and the separator (including the first separator 301 and the second separator 302), winding the first separator 301, cathode piece 110, second separator 302 and anode piece 120 in turn and layer by layer, so as to form the bare battery cell 200. At this time, the obtained bare battery cell 200 is a semi-finished product;

[0074] S30: detecting the bare battery cell 200 to determine whether the weight parameter of the bare battery cell 200 is qualified, that is, performing a screening process, so as to screen and distinguish the bare battery cell 200 with a qualified weight parameter and the bare battery cell 200 with an unqualified weight parameter. Wherein: S31: when the bare battery cell 200 is determined to have a qualified weight parameter, output the bare battery cell 200 with a qualified weight parameter to the next process; S32: when the bare battery cell 200 is determined to have an unqualified weight parameter, recycle the bare battery cell 200 with an unqualified weight parameter.

[0075] The bare battery cell production method provided by the embodiments of the present application is used to produce the bare battery cell 200. The material belt raw material is subjected to the die cutting process, the winding process and the screening process. The screening process is used to screen and distinguish the bare battery cell 200 with a qualified weight parameter and the bare battery cell 200 with an unqualified weight parameter. Finally, the same model batch of bare battery cells 200 with high weight parameter consistency are produced, and the bare battery cell 200 with an unqualified weight parameter is recycled. The bare battery cell 200 is applied to the assembled battery monomer, so that the battery capacity of the battery monomer is consistent and high.

[0076] In combination with FIGS. 1 to 3, Figure 4 to Figure 7 Figure 9 As shown in FIGS. 1 to 3, the bare battery cell production device provided by the embodiments of the present application is used to produce the bare battery cell 200. The material belt sequentially passes through the die cutting mechanism 10 to perform the die cutting process, the winding mechanism 20 to perform the winding process, and the screening mechanism 30 to perform the screening process. The wound bare battery cell 200 is detected by the screening mechanism 30 to determine whether the weight parameter of the bare battery cell 200 is qualified, and then the bare battery cell 200 with a qualified weight parameter is screened, so that the batch of bare battery cells 200 with a qualified weight parameter are finally output from the first discharge port 33, and the bare battery cell 200 with an unqualified weight parameter is output from the second discharge port 34 and recycled. In this way, the batch of bare battery cells 200 with the same model and high weight parameter consistency are produced, and the bare battery cell 200 is applied to the assembled battery monomer, so that the battery capacity of the battery monomer is consistent and high.

[0077] The recycling of the bare battery cell 200 with an unqualified weight parameter includes but is not limited to: directly scrapping the bare battery cell 200 with an unqualified weight parameter; or recycling and saving the bare battery cell 200 with an unqualified weight parameter for application to produce other models of bare battery cells with less weight parameter requirements.

[0078] ​Based on the relationship between the weight of the bare battery cell 200 and the battery capacity of the battery cell assembled by using the bare battery cell 200, in some embodiments of the present application, when performing “S30: detecting the bare battery cell 200 to determine whether the weight parameter of the bare battery cell 200 is qualified”, the bare battery cell 200 is weighed, and then the relationship between the weight of the bare battery cell 200 and the weight parameter of the bare battery cell 200 is used to determine whether the weight parameter of the bare battery cell 200 is qualified. That is, the screening structure 32 of the screening mechanism 30 in the aforementioned bare battery cell production equipment is a weighing device 322, and the weighing device 322 weighs the bare battery cell 200 wound into a shape. Moreover, a qualified weight interval is preset in the control device 321 of the screening mechanism 30, and when the weight of the bare battery cell 200 falls within the qualified weight interval, the bare battery cell 200 is determined by the control device 321 to have a qualified weight parameter, otherwise it will be determined by the control device 321 to have an unqualified weight parameter, so that the judgment process is simple and direct, and the screening efficiency is improved. When performing “S30: detecting the bare battery cell 200 to determine whether the weight parameter of the bare battery cell 200 is qualified” by using the aforementioned bare battery cell production equipment, when the bare battery cell 200 is determined by the control device 321 to have a qualified weight parameter, the control device 321 controls the first conveying device 323 to convey the bare battery cell 200 with a qualified weight parameter to the first discharge port 33, and when the bare battery cell 200 is determined by the control device 321 to have an unqualified weight parameter, the control device 321 controls the second conveying device 324 to convey the bare battery cell 200 with an unqualified weight parameter to the second discharge port 34.

[0079] In order to reduce the number of bare battery cells 200 with unqualified weight parameters and improve the yield of bare battery cells 200, when the bare battery cell 200 is weighed, if the weight of the bare battery cell 200 is greater than the upper threshold of the qualified weight interval, the cutting length of the pole piece 100 is reduced in “cutting the material belt into pole pieces 100”, and if the weight of the bare battery cell 200 is less than the lower threshold of the qualified weight interval, the cutting length of the pole piece 100 is increased in “cutting the material belt into pole pieces 100”, that is, the S40 operation is performed, as shown in Figure 11 to Figure 13 Thus, in the process of producing the bare battery cell 200, the weight result of the currently weighed and detected bare battery cell 200 can be used as reference data for the next wound bare battery cell 200, so that the required length of the pole piece of the next bare battery cell 200 can be adjusted according to the current reference data in the process of producing the bare battery cell 200, thereby improving the yield of the cut and wound bare battery cell 200.

[0080] In combination with Figure 4 to Figure 7 , Figure 9As shown, the foregoing bare cell production equipment is provided with a feedback system 40 to realize the feedback correlation between the weighing device 322 and the cutting device 121 of the die-cutting mechanism 10. That is, the feedback system 40 feeds the weighing result of the current bare cell 200 by the weighing device 322 to the cutting device 121, and then the feedback system 40 controls the cutting device 121 to adjust the cutting length of the cathode sheet 110 and / or the anode sheet 120, that is, to adjust the weight of the next wound and formed bare cell 200. In this way, the weight parameter of the next bare cell 200 is adjusted, so as to reduce the number of bare cells 200 with unqualified weight parameters and improve the yield of the bare cells 200.

[0081] In some embodiments of the present application, in the "reducing the cutting length of the pole piece 100", the cutting length of the cathode sheet 110 and / or the anode sheet 120 is reduced. Alternatively, in some other embodiments of the present application, in the "increasing the cutting length of the pole piece 100", the cutting length of the cathode sheet 110 and / or the anode sheet 120 is increased. By adjusting the cutting length of the cathode sheet 110 and / or the anode sheet 120, the weight of the next wound and formed bare cell 200 is adjusted, that is, the weight parameter of the next bare cell 200 is adjusted, so as to reduce the number of bare cells 200 with unqualified weight parameters and improve the yield of the bare cells 200.

[0082] As shown in Figure 12 and Figure 13 , the preparation method of the bare cell 200 further comprises S50: clamping and shaping the bare cell 200. When the bare cell 200 output after the winding process is completed, the wound and formed bare cell 200 is still in a fluffy state, the shape profile of the bare cell 200 is not fixed, that is, the cathode sheet 110, the anode sheet 120, the first separator 301 and the second separator 302 inside the bare cell 200 are not dense, the volume of the bare cell 200 is relatively large, and the relative position between the cathode sheet 110 and the anode sheet 120 in the bare cell 200 is prone to slip and is not easy to be correctly assembled into the battery case, and is not suitable for being directly applied to the device production battery. Therefore, the fluffy bare cell 200 needs to be clamped and shaped, in combination with Figure 6 , Figure 7 and Figure 9 , the foregoing bare cell production equipment adopts a shaping mechanism 50 to clamp and shape the fluffy bare cell 200, so as to obtain a bare cell 200 with a required smaller shape profile and a dense interior.

[0083] In some embodiments of the present application, as shown in Figure 12 , after the step of "winding and forming the pole piece 100 into a bare cell 200" is completed, "S50: clamping and shaping the bare cell 200" is performed. In combination with Figure 6 and Figure 9As shown, in the aforementioned bare cell production equipment, the shaping mechanism 50 is located between the winding mechanism 20 and the screening mechanism 30. After the bare cell 200 formed by winding is output from the winding outlet 23 and before the bare cell 200 is conveyed into the screening mechanism 30 from the screening inlet 31, the shaping mechanism 50 clamps and shapes all the bare cells 200 formed by winding, so that the interior of all the bare cells 200 meets the requirement of being dense.

[0084] Alternatively, in some other embodiments of this application, such as Figure 13 As shown, after completing the "inspection of bare cell 200" and before "outputting bare cell 200 to the next process", "S50: clamping and shaping of bare cell 200" is performed. Combined with... Figure 7 As shown, in the aforementioned bare cell production equipment, the shaping mechanism 50 is located downstream of the first discharge port 33. Thus, the shaping mechanism 50 clamps and shapes the bare cells 200 that meet the weight parameters, ensuring that the interior of the bare cells 200 that meet the weight parameters meets the density requirements. For bare cells 200 that do not meet the weight parameters, there is no need to clamp and shape them; these bare cells 200 that do not meet the weight parameters are directly recycled.

[0085] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A bare cell production apparatus characterized by comprising: The application relates to a bare battery cell production device. The bare battery cell production device comprises a screening mechanism, a first discharge port and a second discharge port. The screening mechanism comprises a control device, a weighing device, a first conveying device and a second conveying device, the control device is electrically connected with the weighing device, the first conveying device and the second conveying device, the weighing device is used for detecting the weight parameter of the bare battery cell, the first conveying device is arranged in correspondence with the first discharge port to convey the bare battery cell with the qualified weight parameter to the first discharge port, and the second conveying device is arranged in correspondence with the second discharge port to convey the bare battery cell with the unqualified weight parameter to the second discharge port.

2. The bare battery cell production device according to claim 1, wherein the bare battery cell production device further comprises a die-cutting mechanism and a feedback system, the die-cutting mechanism is used for die-cutting the material belt into pole pieces, the die-cutting mechanism comprises a cutting device, and the feedback system is electrically connected with the control device and the cutting device.

3. The bare battery cell production device according to claim 2, wherein the bare battery cell production device further comprises a winding mechanism and a shaping mechanism, the winding mechanism is used for winding the pole pieces into the bare battery cell, the screening mechanism further comprises a screening inlet, the screening inlet is connected with a winding discharge port of the winding mechanism, and the shaping mechanism is arranged between the winding mechanism and the screening mechanism.

4. The bare battery cell production device according to claim 2, wherein the bare battery cell production device further comprises a shaping mechanism, and the shaping mechanism is arranged downstream of the first discharge port.

5. The bare battery cell production device according to claim 3 or 4, wherein the shaping mechanism comprises a hot-pressing device, the hot-pressing device comprises a shaping press plate and a heating structure, and the heating structure is arranged on the shaping press plate.

6. The bare battery cell production device according to claim 3 or 4, wherein the shaping mechanism comprises a tunnel furnace and a cold press arranged in sequence, the tunnel furnace is used for heating the bare battery cell, and the cold press comprises a shaping press plate, and the shaping press plate clamps and shapes the bare battery cell output from the tunnel furnace.

7. The bare battery cell production device according to claim 3 or 4, wherein the shaping mechanism comprises a heating power supply and a cold press, positive and negative terminals of the heating power supply are electrically connected with two cathode tabs and / or two anode tabs of the bare battery cell respectively, the cold press comprises a shaping press plate, and the shaping press plate clamps and shapes the heated bare battery cell. The bare battery cell is manufactured by using the bare battery cell production device according to any one of claims 1-7. The bare battery cell production device according to any one of claims 1-7 is provided. ​ ​ ​ ​ 8. A bare cell characterized by, ​ 9. A battery production line, characterized by ​

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