Tab shaping equipment and tab shaping method

Abstract

The invention relates to the field of production equipment, in particular to tab shaping equipment and a tab shaping method. The tab shaping equipment comprises a plurality of pressure applying cylinders; the plurality of pressure applying cylinders are sequentially arranged in a nested manner, and the axes of the plurality of pressure applying cylinders are collinear with the axis of a to-be-shaped battery cell; the pressure applying end surfaces of the plurality of pressure applying cylinders are opposite to the tab end surface of the battery cell to be shaped; and any one of the pressure applying cylinders can do reciprocating motion along the axial direction, so that the pressure applying end surface applies pressure to the tab led out from the tab end surface and bends the tab. According to the tab shaping equipment provided by the invention, the tabs led out from the to-be-shaped battery cell can be flattened and shaped layer by layer from inside to outside in the winding process of the to-be-shaped battery cell by arranging a plurality of pressure applying cylinders, so that the tabs on the outer ring can be stacked layer by layer from the tabs on the inner ring, the consistency of the bent state after the tabs are flattened is improved, and the welding effect of the tabs is ensured; and the phenomenon of inverted insertion of the tabs is not easy to occur.

Description

Technical Field

[0001] The present application relates to the field of production equipment, and in particular to a tab shaping device and a tab shaping method. Background Art

[0002] At present, various car companies have successively started using cylindrical batteries as the main power source in new energy vehicles. In terms of the manufacturing process, the battery cells of cylindrical batteries are different from other battery cells from the beginning of winding, and the number of pole ears is more and denser. Taking the 46XX large cylindrical battery cell as an example, the number of pole ears is thousands. The pole ears need to be pre-folded (smoothed) before flattening, and then the pre-folded pole ears are flattened on the end face of the battery cell. During the pre-folding process, the pre-folding conditions of each circle of pole ears need to be basically consistent, so that the final effect can meet the requirements, otherwise the subsequent welding of the busbar and the pole ears will explode and cause unqualified welding quality.

[0003] The existing smoothing and flattening devices cannot keep the pre-bending conditions of each circle of the pole lugs consistent, and the final flattening effect is poor, which affects the welding quality of the busbar and the pole lugs. Summary of the invention

[0004] The purpose of the present application is to provide a tab shaping device and a tab shaping method, which are used to solve the problem that the existing smoothing and flattening devices cannot keep the pre-folding conditions of each circle of tabs consistent, the final flattening effect is poor, and the welding quality of the busbar and the tab is affected.

[0005] The present application provides a tab shaping device, comprising a plurality of pressure cylinders;

[0006] The plurality of pressure cylinders are nested in sequence, and the axes of the plurality of pressure cylinders are collinear with the axis of the battery cell to be shaped;

[0007] The pressure end faces of the plurality of pressure cylinders are opposite to the end faces of the pole lugs of the battery cell to be shaped; any of the pressure cylinders can reciprocate along the axial direction so that the pressure end face presses and bends the pole lugs led out from the end faces of the pole lugs.

[0008] In the above technical solution, further, the thickness of the plurality of pressure cylinders is the same;

[0009] A preset gap is arranged between adjacent pressure cylinders.

[0010] In the above technical solution, further, it also includes a winding needle;

[0011] The innermost circle of the pressure-applying cylinder is sleeved on the winding needle, and a preset gap is provided between the innermost circle of the pressure-applying cylinder and the winding needle;

[0012] The outer diameter of the outermost circle of the pressure cylinder is not less than the outer diameter of the battery cell to be shaped;

[0013] The pole piece wound on the winding needle forms the battery core to be shaped.

[0014] In the above technical solution, further, the preset diameter of the battery cell to be shaped is D1, the diameter process tolerance of the battery cell to be shaped is a, and a is between 1mm and 2mm; the tab height of the battery cell to be shaped is L; the diameter of the winding needle is d;

[0015] The outer diameter of the outermost circle of the pressure cylinder is D2, and the inner diameter of the outermost circle of the pressure cylinder is D3; the thickness of the pressure cylinder is b; the preset gap is R; the number of the pressure cylinders is X;

[0016] The multiple parameters have the following relationship: D3<D1<D2, and D2-D1=a; 2b=D2-D3=nL, and n is between 2 and 4; X retains integer digits, and when When the ratio has a decimal point, X increases by 1.

[0017] In the above technical solution, further, it also includes a detection device; the detection device is used to obtain image information of the electrode lug after shaping.

[0018] The present application also provides a method for shaping a tab, using the tab shaping device as described in the above solution, the method comprising the following steps:

[0019] From the inner ring to the outer ring, the plurality of pressure cylinders sequentially approach the end face of the pole lug to sequentially press and bend the pole lugs within different ring widths from the inside to the outside, so that the pole lugs are bent and laminated to fit the end face of the pole lugs.

[0020] In the above technical solution, further, from the inner circle to the outer circle, the plurality of pressure cylinders are respectively the first pressure cylinder, the second pressure cylinder ... the Nth pressure cylinder, and N is an integer greater than 1;

[0021] When the battery cell to be shaped is wound to an outer diameter equal to the outer diameter of the Yth pressure cylinder, the Yth pressure step is performed: the Yth pressure cylinder, the Y-1th pressure cylinder, ... the first pressure cylinder presses and bends the corresponding tab in sequence; and Y is between 1 and N-1;

[0022] The final pressing step is performed until the battery cell to be shaped is wound to a preset diameter.

[0023] In the above technical solution, further, when the battery cell to be shaped is wound to a preset diameter, the final pressurizing step is repeated twice so that the height of the electrode ear after shaping is less than or equal to a preset flattening height.

[0024] In the above technical solution, further, from the inner ring to the outer ring, the distances that the multiple pressure cylinders feed toward the end surface of the pole lug are shortened successively.

[0025] In the above technical solution, further, according to the image information of the shaped tab acquired by the detection device, any of the pressure cylinders can apply pressure to bend the tab.

[0026] Compared with the prior art, the beneficial effects of this application are:

[0027] The tab shaping equipment provided in the present application, by providing a plurality of pressure cylinders, can flatten and shape the tabs led out from the inside to the outside layer by layer during the winding process of the battery cell to be shaped, so as to achieve the stacking of the outer ring tabs to the inner ring tabs layer by layer, thereby improving the consistency of the bending state of the tabs after flattening, ensuring the welding effect of the tabs, and preventing the tabs from being inverted.

[0028] The present application also provides a tab shaping method, including the tab shaping device described in the above scheme. Based on the above analysis, it can be seen that the tab shaping method also has the above beneficial effects, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 A first structural schematic diagram of the tab shaping device provided in this application;

[0031] Figure 2 A second structural schematic diagram of the tab shaping device provided in this application;

[0032] Figure 3 A schematic diagram of the shaping process of the tab shaping equipment provided in this application;

[0033] Figure 4 This is a schematic diagram of the structure of the logistics line provided for this application.

[0034] In the figure: 101 - pressure cylinder; 102 - battery cell to be shaped; 103 - pressure end face; 104 - pole ear end face; 105 - pole ear; 106 - winding needle; 107 - detection device. DETAILED DESCRIPTION

[0035] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0036] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying 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 limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0037] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] In the industry, for the shaping of the tabs, there is a process route of smoothing + flattening. Smoothing is to pre-fold the tabs, and flattening is to flatten the tabs completely on the end face of the cell after the tabs are pre-folded. At present, there are two types of smoothing and flattening devices on the market. One is that the round wheel of smoothing is used to smooth while winding the cell, and the mechanism gradually moves backward as the winding diameter increases. This structure can only keep the tabs in a bent state temporarily. In addition, as the number of winding layers increases, the number of overlapping layers of the tabs also increases, and the smoothing wheel and the tabs must maintain a sufficient gap. During the retreat of the smoothing wheel, the number of inner ring tabs that are not squeezed by the smoothing wheel continues to increase, the bending stress will continue to be released, and the tabs will eventually return to their original state. Another smoothing method is blowing, which cannot guarantee the bending effect of the inner ring tabs, and will also introduce foreign matter into the cell. Moreover, taking the cylindrical cell with tabs on both sides as an example, the flattening tooling used for these two smoothing methods is two spaced flat plates, the cell is located between the two flat plates, and one flat plate is used to hit one end face. For cylindrical cells with tabs on the same side, a flat plate is used to hit all positive and negative tabs at the same time. In the above case, when the tabs are not bent in the same state, this flattening tool is used, and the final flattening will result in an uneven tab surface, which will affect the welding quality and further affect the battery's current capacity. In addition, since the final flattening state is uncontrollable, the tab state needs to be manually determined, which is time-consuming and labor-intensive.

[0039] After unremitting efforts, the inventor found the cause of the problems in the existing smoothing + flattening process route and proposed a new tab shaping equipment.

[0040] Embodiment 1

[0041] The tab shaping device provided in the present application can be applied to cylindrical cells with tabs 105 led out at both ends, and the flattening operation of the tab 105 at one end of the cylindrical cell is taken as an example for explanation, and the flattening operation principle of the tab 105 at the other end is the same. In addition, the present solution can also be applied to cylindrical cells with tabs 105 led out on the same side. For cylindrical cells with tabs 105 led out on the same side, the positive and negative tabs 105 are flattened at the same time each time.

[0042] See also Figures 1 to 4 As shown, the tab shaping equipment includes multiple pressure cylinders 101; the multiple pressure cylinders 101 are nested in sequence, and the axes of the multiple pressure cylinders 101 are collinear with the axes of the battery cells 102 to be shaped; the pressure end faces 103 of the multiple pressure cylinders 101 are opposite to the tab end faces 104 of the battery cells 102 to be shaped; any pressure cylinder 101 can reciprocate along the axial direction so that the pressure end face 103 presses and bends the tab 105 led out from the tab end face 104.

[0043] Specifically, the tab shaping device provided by the present application can be integrated in the winding station to pre-snap (pre-fold) the battery cell 102 to be shaped. Taking the tab shaping device integrated in the winding station as an example, the axes of the multiple pressure cylinders 101 nested in sequence provided in the tab shaping device are colinear with the axis of the battery cell 102 to be shaped, so that the multiple pressure cylinders 101 can flatten and shape the tabs 105 of the battery cell 102 to be shaped layer by layer during the winding process.

[0044] See also Figure 3 As shown, as the winding process continues, when the battery cell 102 to be shaped reaches the outer diameter of the innermost circle pressure cylinder 101, the winding stops or slows down, and at this time, the end face 104 of the pole ear of the battery cell 102 to be shaped matches the pressure end face 103 of the innermost circle pressure cylinder 101. The PLC transmits a signal to the pole ear shaping device, and the innermost circle pressure cylinder 101 extends to flatten the pole ear 105 led out of the pressure end face 103, and retracts after beating once. The winding is then started or accelerated, and when the battery cell 102 to be shaped is wound to the outer diameter of the second circle pressure cylinder 101 (counted from the inside to the outside), the winding stops or slows down, and at this time, the area on the pole ear end face 104 of the battery cell 102 to be shaped where the pole ear 105 is not flattened is distributed in a ring shape and matches the pressure end face 103 of the second circle pressure cylinder 101. The PLC transmits a signal to the tab shaping equipment, and the second circle of pressure cylinders 101 extend to flatten the tabs 105 leading out of the pressure end face 103, and retreat after one tapping. The tabs 105 flattened by the second circle of pressure cylinders 101 are pressed on the tabs 105 flattened by the first circle of pressure cylinders 101 ... until the winding of the battery cell 102 to be shaped is completed, and the corresponding pressure cylinders 101 flatten the tabs 105 in the outermost area, thus completing the flattening and shaping process for all the tabs 105.

[0045] In addition, the number of pressure cylinders 101 can be set according to actual conditions. By adjusting the number of pressure cylinders 101, cylindrical battery cells of various diameters can be compatible, and the operation is simple, which can reduce the cost of replacement and operating costs.

[0046] The tab shaping device provided by the present application can flatten and shape the tabs 105 led out from the inside to the outside layer by layer during the winding process of the battery cell 102 to be shaped by setting a plurality of pressure cylinders 101, so as to achieve the stacking of the outer ring tabs 105 to the inner ring tabs 105 layer by layer, improve the consistency of the bending state of the tabs 105 after flattening, ensure the welding effect of the tabs 105, and prevent the tabs 105 from being inserted upside down. In addition, the tab shaping device provided by the present application does not need to independently set up the two devices of the flattening device and the flattening device, which simplifies the existing flattening device and the flattening device, and simplifies the existing tab shaping process.

[0047] In an optional solution of this embodiment, the thickness of the plurality of pressure cylinders 101 is the same, the ring width of the pressure end surface 103 of each pressure cylinder 101 is equal, and the ring width of the area where the unflattened pole lugs 105 are distributed corresponding to each flattening operation is equal. In each flattening operation, the number of layers of the pole lugs 105 to be flattened is the same, so that the pre-folding conditions of each layer of the pole lugs 105 are more easily kept consistent.

[0048] Furthermore, a preset gap is provided between adjacent pressure cylinders 101. The smaller the preset gap between the pressure cylinders 101, the better. If the preset gap is too large, some of the tabs 105 cannot be flattened by pressure; but if the preset gap is too small, the pressure cylinder 101 will be worn during the expansion and contraction process. Specifically, the preset gap is not less than 1 mm. For example, the preset gap is greater than or equal to 1 mm and less than or equal to 3 mm. The preset gap can be 1 mm, 1.2 mm, 1.4 mm, 1.5 mm, 1.7 mm, 1.9 mm, 2.0 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.7 mm or 3 mm, but is not limited to the listed values. Other values ​​not listed within the numerical range are also applicable.

[0049] In an optional scheme of this embodiment, the pole ear shaping equipment also includes a winding needle 106; the innermost circle of the pressure cylinder 101 is sleeved on the winding needle 106, and a preset gap is set between the innermost circle of the pressure cylinder 101 and the winding needle 106; the outer diameter of the outermost circle of the pressure cylinder 101 is not less than the outer diameter of the battery cell 102 to be shaped; the pole piece wound on the winding needle 106 forms the battery cell 102 to be shaped.

[0050] In this embodiment, see Figure 3As shown, when the tab shaping device is integrated in the winding station, the pole piece is wound around the rotating winding needle 106 to form the battery cell 102 to be shaped. The innermost pressure cylinder 101 is sleeved on the winding needle 106 to achieve the installation of multiple pressure cylinders 101 adjacent to the battery cell 102 to be shaped, so as to make the device more compact. A preset gap is set between the innermost pressure cylinder 101 and the winding needle 106 so that the setting of the pressure cylinder 101 does not affect the rotation of the winding needle 106.

[0051] Furthermore, the outer diameter of the outermost pressure tube 101 is not less than the outer diameter of the battery cell 102 to be shaped, which can ensure that the outermost pressure tube 101 can fully cover the tabs 105 leading out of the battery cell 102 to be shaped, so that the tabs 105 leading out of the shaped battery cell 102 can all be flattened and shaped.

[0052] In the optional solution of this embodiment, specifically, the preset diameter of the battery cell 102 to be shaped is set to D1, the diameter process tolerance of the battery cell 102 to be shaped is a, and a is between 1mm and 2mm. During the production process, the diameter of the battery cell 102 to be shaped formed by actual winding will be slightly larger than the preset diameter by 1mm to 2mm. When setting the number and size of the pressure cylinder 101, the diameter process tolerance of the battery cell 102 to be shaped needs to be taken into account.

[0053] In addition, the height of the tab 105 of the battery cell 102 to be shaped is set to L; the diameter of the winding needle 106 is d; the outer diameter of the outermost circle of the pressure cylinder 101 is D2, and the inner diameter of the outermost circle of the pressure cylinder 101 is D3; the thickness of the pressure cylinder 101 is b; the preset gap is R; and the number of pressure cylinders 101 is X.

[0054] The above parameters have the following relationship: D3<D1<D2, and D2-D1=a; 2b=D2-D3=nL, and n is between 2 and 4; X retains integer digits, and when When the ratio has a decimal point, X increases by 1.

[0055] In this embodiment, the thickness of each layer of the pressure cylinder 101 is at least one time the height of the tab 105. Generally speaking, the thickness of the pressure cylinder 101 is one to two times the height of the tab 105, so that the pressure end surface 103 of the pressure cylinder 101 can at least pressurize and bend the entire tab 105, so that the tab 105 after flattening is flatter. According to the above relationship, the number of pressure cylinders 101 required can be calculated according to the size of the battery cell 102 to be shaped.

[0056] Specifically, taking a cylindrical battery with a diameter of 46mm as an example, the preset diameter D1 is 46mm, the diameter process tolerance a is set to 2mm, the length L of the tab 105 is 4mm, the diameter d of the winding needle 106 is 6mm, and the preset gap R between the pressure cylinders 101 is 1mm. First, according to D2-D1=a, D2=48mm is calculated; then, according to 2b=D2-D3=nL, where the coefficient n is 3, D3=36mm and b=6mm are calculated; finally, according to It is calculated that X=3.

[0057] Optionally, the number of pressure cylinders 101 is 4 to 10. In order to make the tab shaping device adapt to cylindrical cells with more diameters, the number of pressure cylinders 101 can be increased. When winding a small diameter cell, the outermost circles of pressure cylinders 101 may not be used. The thickness of each pressure cylinder 101 can also be set to be different, which is set according to the actual situation.

[0058] Embodiment 2

[0059] The tab shaping device in the second embodiment is an improvement on the above embodiment, and the technical contents disclosed in the above embodiment will not be described repeatedly, and the contents disclosed in the above embodiment also belong to the contents disclosed in the second embodiment.

[0060] In an optional solution of this embodiment, the tab shaping device further includes a detection device 107 ; the detection device 107 is used to obtain image information of the tab 105 after shaping.

[0061] In this embodiment, after the winding of the battery cell 102 to be shaped is completed, it needs to be transferred to the next station through the logistics line to perform welding of the tab 105 and the busbar. Figure 4 As shown, in order to avoid the tab 105 rebounding due to a long transit time, a tab shaping device can be integrated on the logistics line to perform a final beat on the tab 105. Integrating the final beat process on the logistics line can avoid the problem of "core pulling" caused by the winding needle 106 being pulled out after the winding is completed.

[0062] Furthermore, before the final shot of the battery cell 102 to be shaped, a detection device 107 is set on the logistics line to obtain image information of the shaped pole lug 105, so that the pole lug shaping equipment can retake the problematic pole lug 105. The detection device 107 is specifically a CCD camera, which is used to obtain the state of the pole lug 105. When the CCD camera identifies which area of ​​the pole lug 105 corresponding to the pressure cylinder 101 has a problem, the corresponding pressure cylinder 101 is used to tap the pole lug 105, and the feeding distance of the pressure cylinder 101 is controlled so that the pressure cylinder 101 automatically compensates and corrects the pole lug 105. In this way, it can be ensured that before the final shot of the battery cell 102 to be shaped, the pre-folding conditions of all pole lugs 105 are basically consistent, thereby ensuring a reliable final shot effect.

[0063] Embodiment 3

[0064] Embodiment 3 of the present application provides a method for shaping a tab, using a tab shaping device as in any of the above embodiments, the method comprising the following steps:

[0065] From the inner circle to the outer circle, multiple pressure cylinders 101 approach the pole ear end face 104 in sequence to press and bend the pole ears 105 in different ring widths from the inside to the outside, so that the pole ears 105 are bent and stacked to fit the pole ear end face 104.

[0066] In this embodiment, specifically, during the winding process of the battery cell 102 to be shaped, when the battery cell 102 to be shaped reaches the outer diameter of the innermost circle pressure cylinder 101, the winding stops or slows down, and at this time, the end face 104 of the pole ear of the battery cell 102 to be shaped is matched with the pressure end face 103 of the innermost circle pressure cylinder 101. The PLC transmits a signal to the pole ear shaping device, and the innermost circle pressure cylinder 101 extends to flatten the pole ear 105 led out of the pressure end face 103, and retracts after beating once. The winding is then started, and when the battery cell 102 to be shaped is wound to the outer diameter of the second circle pressure cylinder 101 (counted from the inside to the outside), the winding stops or slows down, and at this time, on the end face 104 of the pole ear of the battery cell 102 to be shaped, the area where the pole ear 105 that has not been flattened is distributed is annular and is matched with the pressure end face 103 of the second circle pressure cylinder 101. The PLC transmits a signal to the tab shaping equipment, and the second circle of pressure cylinders 101 extend to flatten the tabs 105 leading out of the pressure end face 103, and retreat after one tapping. The tabs 105 flattened by the second circle of pressure cylinders 101 are pressed on the tabs 105 flattened by the first circle of pressure cylinders 101 ... until the winding of the battery cell 102 to be shaped is completed, and the corresponding pressure cylinders 101 flatten the tabs 105 in the outermost area, thus completing the flattening and shaping process for all the tabs 105.

[0067] In an optional scheme of this embodiment, from the inner circle to the outer circle, the multiple pressure cylinders 101 are respectively the first pressure cylinder, the second pressure cylinder...the Nth pressure cylinder, and N is an integer greater than 1; when the battery cell 102 to be shaped is wound to an outer diameter equal to the outer diameter of the Yth pressure cylinder, the Yth pressure step is performed: the Yth pressure cylinder, the Y-1th pressure cylinder...the first pressure cylinder pressurizes and bends the corresponding pole ear 105 in turn; and Y is between 1 and N-1; until the battery cell 102 to be shaped is wound to a preset diameter, the final pressure step is performed.

[0068] In this embodiment, in order to prevent the tab 105 from being bent and releasing the stress so that the tab 105 can return to its original state, the present application sets a plurality of pressure cylinders 101 to reciprocately beat the multi-layer tabs 105 of the battery cell 102 to be shaped, so that the tab 105 can always remain in a bent state. Figure 1 and Figure 2As shown in the figure, five pressure cylinders 101 are nested in sequence, and the five pressure cylinders 101 are numbered: No. 1, No. 2, ..., No. 5 from the inside to the outside. In the process of winding the battery cell 102 to be shaped, when the battery cell 102 to be shaped reaches the outer diameter of the No. 1 pressure cylinder 101, the first pressure step is performed: the No. 1 pressure cylinder 101 beats and shapes the corresponding pole ear 105; when the battery cell 102 to be shaped reaches the outer diameter of the No. 2 pressure cylinder 101, the second pressure step is performed: the No. 2 pressure cylinder 101 beats and shapes the corresponding pole ear 105, and the No. 1 pressure cylinder 101 beats and shapes the corresponding pole ear. The ear 105 is tapped and shaped; when the battery cell 102 to be shaped reaches the outer diameter of the No. 3 pressure cylinder 101, the third pressure step is performed: the No. 3 pressure cylinder 101 taps and shapes the corresponding pole ear 105, the No. 2 pressure cylinder 101 taps and shapes the corresponding pole ear 105, the No. 1 pressure cylinder 101 taps and shapes the corresponding pole ear 105... and so on, until the battery cell 102 to be shaped is wound to a preset diameter, and the last pressure step is performed.

[0069] It should be noted that the pressure cylinder 101 corresponding to the last pressure step needs to be set according to the diameter of the battery cell 102 to be shaped. That is to say, only the inner four pressure cylinders 101 may need to move among the five pressure cylinders 101. The movement process of the four pressure cylinders 101 is simplified as follows: 1→21→321→4321 (the numbers represent the pressure cylinder 101 in Figure 1 and Figure 2 ).

[0070] In an optional solution of this embodiment, when the battery cell 102 to be shaped is wound to a preset diameter, the final pressing step is repeated twice so that the height of the shaped tab 105 is less than or equal to a preset flattening height.

[0071] In this embodiment, at the stage where the winding of the battery cell 102 to be shaped is terminated, after all the pressure cylinders 101 are flattened, a final pressure step may be added until the tab 105 reaches the required final flattened height. Taking the actions of four pressure cylinders 101 as an example, the action process is: 1→21→321→4321→4321 (the numbers represent the pressure cylinders 101 in Figure 1 and Figure 2 ).

[0072] In an optional solution of this embodiment, the distances that the multiple pressure cylinders 101 feed toward the end surface 104 of the pole lug are shortened successively from the inner ring to the outer ring.

[0073] In this embodiment, see Figures 1 to 3As shown, for the multiple pressure cylinders 101 of equal length shown in the figure, the distance between the pressure cylinder 101 and the end face 104 of the pole ear is equal. As the number of winding layers of the battery cell 102 to be shaped increases, the number of stacked layers and the thickness h of the pole ear 105 gradually increase, and the distance between the pole ear 105 and the outer ring pressure cylinder 101 gradually shortens. Therefore, when the outer ring pressure cylinder 101 beats the pole ear 105, the feeding distance needs to be shortened to avoid crushing the pole ear 105. Alternatively, the pressure end faces 103 of the multiple pressure cylinders 101 are set to have different spacings from the end face 104 of the pole ear, and the specific spacing can be adjusted accordingly according to the thickness of the foil and the number of core layers.

[0074] In an optional solution of this embodiment, according to the image information of the shaped tab 105 obtained by the detection device 107, any pressure cylinder 101 can press and bend the tab 105. The detection device 107 is specifically a CCD camera, which is used to obtain the state of the tab 105. The CCD camera identifies which tab 105 area corresponding to which pressure cylinder 101 has a problem, and uses the corresponding pressure cylinder 101 to tap the tab 105, and controls the feeding distance of the pressure cylinder 101, so that the pressure cylinder 101 automatically compensates and corrects the tab 105.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application is described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application. In addition, a person skilled in the art can understand that although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments means being within the scope of the present application and forming different embodiments.

Claims

1. A tab shaping device, characterized in that: It comprises a plurality of pressure cylinders (101); The plurality of pressure cylinders (101) are nested in sequence, and the axes of the plurality of pressure cylinders (101) are collinear with the axis of the battery cell (102) to be shaped; The pressure end faces (103) of the plurality of pressure cylinders (101) are opposite to the pole ear end faces (104) of the battery cell (102) to be shaped; any one of the pressure cylinders (101) can reciprocate along the axial direction so that the pressure end face (103) applies pressure to bend the pole ear (105) extending from the pole ear end face (104).

2. The terminal ear shaping device according to claim 1, characterized in that: The thickness of the plurality of pressure cylinders (101) is the same; A preset gap is provided between adjacent pressure cylinders (101).

3. The terminal ear shaping device according to claim 2, characterized in that: Also included is a winding needle (106); The innermost pressure cylinder (101) is sleeved on the winding needle (106), and a preset gap is provided between the innermost pressure cylinder (101) and the winding needle (106); The outer diameter of the outermost circle of the pressure cylinder (101) is not less than the outer diameter of the battery cell (102) to be shaped; The pole piece wound on the winding needle (106) forms the battery core (102) to be shaped.

4. The terminal ear shaping device according to claim 3, characterized in that: The preset diameter of the battery cell (102) to be shaped is D1, the diameter process tolerance of the battery cell (102) to be shaped is a, and a is between 1 mm and 2 mm; the height of the tab (105) of the battery cell (102) to be shaped is L; the diameter of the winding needle (106) is d; The outer diameter of the outermost circle of the pressure cylinder (101) is D2, and the inner diameter of the outermost circle of the pressure cylinder (101) is D3; the thickness of the pressure cylinder (101) is b; the preset gap is R; the number of the pressure cylinders (101) is X; The multiple parameters have the following relationship: D3<D1<D2, and D2-D1=a; 2b=D2-D3=nL, and n is between 2 and 4; X retains integer digits, and when When the ratio has a decimal point, X increases by 1.

5. The terminal ear shaping device according to claim 1, characterized in that: It also comprises a detection device (107); the detection device (107) is used to obtain image information of the electrode tab (105) after shaping.

6. A method for shaping a tab, characterized in that: Using the tab shaping device as described in any one of claims 1 to 5, the method comprises the following steps; From the inner ring to the outer ring, the plurality of pressure cylinders (101) are sequentially close to the pole ear end face (104) to sequentially press and bend the pole ears (105) within different ring width ranges from the inside to the outside, so that the pole ears (105) are bent and laminated to fit the pole ear end face (104).

7. The method for shaping the tab according to claim 6, characterized in that: From the inner circle to the outer circle, the plurality of pressure cylinders (101) are respectively a first pressure cylinder, a second pressure cylinder ... an Nth pressure cylinder, and N is an integer greater than 1; When the battery cell (102) to be shaped is wound to an outer diameter equal to the outer diameter of the Yth pressure cylinder, the Yth pressure step is performed: the Yth pressure cylinder, the Y-1th pressure cylinder, ... the first pressure cylinder sequentially pressurize and bend the corresponding pole ear (105); and Y is between 1 and N-1; The final pressing step is performed until the battery cell (102) to be shaped is wound to a preset diameter.

8. The method for shaping the tab according to claim 6, characterized in that: When the battery cell (102) to be shaped is wound to a preset diameter, the final pressing step is repeated twice so that the height of the electrode tab (105) after shaping is less than or equal to a preset flattening height.

9. The method for shaping the tab according to claim 6, characterized in that: From the inner ring to the outer ring, the distances that the multiple pressure cylinders (101) feed toward the pole lug end surface (104) are shortened successively.

10. The method for shaping the tab according to claim 6, characterized in that: According to the image information of the shaped pole lug (105) acquired by the detection device (107), any of the pressure-applying cylinders (101) can apply pressure to the pole lug (105) to bend it.

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