Correcting device

Abstract

The utility model discloses a correction device, which comprises at least one upper correction column, at least one lower correction column and at least one lower correction column, the at least one lower correction column comprises a plurality of lower correction pieces which are arranged at intervals in the first direction; wherein each upper correction piece comprises a lower pressing face close to the lower correction piece, and the heights of the lower pressing faces of the multiple upper correction pieces in the upper correction column are gradually increased from the middle of the upper correction column to the two ends of the upper correction column in the first direction; each lower correcting piece comprises a top pressing face close to the upper correcting piece, and the heights of the top pressing faces of the multiple lower correcting pieces in the lower correcting column are gradually increased from the middle of the lower correcting column to the two ends of the lower correcting column in the first direction. In the embodiment of the utility model, under the matching of the upper correction column and the lower correction column, the front surface of the battery piece is in a bending state with two upward sides in the welding process, and welding and cooling are completed so as to counteract the warping value in the cooling process of the battery piece, so that the final warping amount of the battery piece is reduced.

Description

Technical Field

[0001] The utility model relates to the field of battery sheet correction, in particular to a correction device. Background Art

[0002] In the back-contact solar cell, the positive and negative electrodes are located on the back, and there is no grid line blocking the front, so as to reduce optical loss and improve power generation efficiency.

[0003] When welding the back-contact cell, since the soldering ribbons are all located on the back side of the back-contact cell, after welding, the cooling and shrinkage of the soldering ribbons will cause the back-contact cell to warp and bend, which will lead to difficulties in subsequent production processes.

[0004] Therefore, how to improve the warping caused by back contact battery cell welding is an urgent problem that needs to be solved. Utility Model Content

[0005] The utility model provides a correction device, aiming to at least solve the technical problem of warping caused by back contact battery welding in the prior art.

[0006] The present invention provides a correction device, comprising:

[0007] at least one upper correction column, comprising a plurality of upper correction members spaced apart along a first direction;

[0008] at least one lower correction column, comprising a plurality of lower correction members spaced apart along the first direction;

[0009] Wherein, the upper correction member comprises a lower pressure surface close to the lower correction member, and the heights of the lower pressure surfaces of the plurality of upper correction members in the upper correction member column gradually increase from the middle of the upper correction member column to the two ends of the upper correction member column along the first direction;

[0010] The lower correction member includes a top pressure surface close to the upper correction member, and the heights of the top pressure surfaces of the plurality of lower correction members in the lower correction member column gradually increase from the middle of the lower correction member column to both ends of the lower correction member column along the first direction.

[0011] Optionally, the lower pressing surfaces of the plurality of upper correction members in the upper correction column are arranged in a downwardly convex curve along the first direction;

[0012] The top pressure surfaces of the plurality of lower correction members in the lower correction row are arranged in a downwardly concave curve along the first direction.

[0013] Optionally, the correction device is used for welding battery cells, and the correction device further comprises a welding heating element, and the welding heating element is used to provide a heat source when welding the battery cells.

[0014] Optionally, a plurality of the upper correction columns are arranged at intervals along the second direction to form an upper correction group corresponding to a single battery cell, and a plurality of the lower correction columns are arranged at intervals along the second direction to form a lower correction group corresponding to a single battery cell, and the second direction is perpendicular to the first direction.

[0015] Optionally, a height difference between the lower pressure surfaces of two upper correction members adjacent to each other in the first direction in the upper correction column is greater than or equal to 2 mm and less than or equal to 2.5 mm;

[0016] The height difference between the top pressure surfaces of two adjacent lower correction members in the lower correction row along the first direction is greater than or equal to 1 mm and less than or equal to 1.5 mm.

[0017] Optionally, the lower pressure surfaces of the plurality of upper correction members in the upper correction column are arranged in an arc shape along the first direction, and the arc angle of the lower pressure surfaces of the plurality of upper correction members in the upper correction column is 0.4 rad-0.9 rad;

[0018] The top pressure surfaces of the multiple lower correction members in the lower correction column are arranged in an arc shape along the first direction, and the arc of the top pressure surfaces of the multiple lower correction members in the lower correction column has an arc angle of 0.2 rad-0.5 rad.

[0019] Optionally, the upper correction member includes a pressure head and a first spring connected to the pressure head, and the lower pressure surface is a surface on the pressure head close to the lower correction member;

[0020] The lower correction member includes a push rod and a second spring connected to the push rod, and the pressing surface is a surface of the push rod close to the upper correction member.

[0021] Optionally, from the middle of the upper correction column to the two ends of the upper correction column along the first direction, the spring weight of the first springs in the plurality of upper correction members in the upper correction column gradually decreases;

[0022] From the middle of the lower correction column to the two ends of the lower correction column along the first direction, the spring weights of the second springs in the plurality of lower correction members in the lower correction column gradually increase.

[0023] Optionally, the lengths of the plurality of upper correction members in the upper correction column gradually decrease from the middle of the upper correction column to both ends of the upper correction column along the first direction.

[0024] Optionally, it further comprises a lifting mechanism connected to the lower correction member, the lifting mechanism is used to drive the lower correction member to rise and fall along a third direction, the third direction is perpendicular to the first direction and the second direction;

[0025] And / or, the lengths of the plurality of lower correction members in the lower correction row gradually increase from the middle of the lower correction row to both ends of the lower correction row along the first direction.

[0026] Optionally, there are multiple upper correction groups and multiple lower correction groups, and the multiple upper correction groups and the multiple lower correction groups are arranged at intervals along the first direction.

[0027] In the embodiment of the utility model, the front of the battery cell presents a bending state with both sides upward during the welding process under the cooperation of the upper correction column and the lower correction column, and the welding and cooling are completed. Since the two sides of the front of the battery cell are always in an upward bending state during the welding and cooling process, the warping value of the battery cell during the cooling process can be effectively offset, thereby reducing the final warping amount of the battery cell. It should be noted that the warping during the cooling process of the battery cell refers to the middle part of the front of the battery cell arching upward during the cooling process. In addition, through the cooperation of the upper correction column and the lower correction column, the battery cell is warped during the welding and cooling process, and there is no need to set up an additional flattening mechanism, and there is no need to bend the welding strip, which is convenient for the preparation, transportation and fixing of the welding strip, and avoids the increase in the difficulty of the welding strip preparation, welding strip transportation and welding process caused by the bending of the welding strip. In addition, there is no need to set a concave arc surface on the welding platform, thereby avoiding poor welding and abnormal battery cell spacing caused by the offset of the battery cell during the welding process.

[0028] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A front view schematic diagram of a correction device provided by an embodiment of the utility model;

[0030] Figure 2 A schematic diagram of the structure of a correction device provided by an embodiment of the utility model in cooperation with a battery cell and a welding strip;

[0031] Figure 3 A side view schematic diagram of a correction device provided by an embodiment of the utility model;

[0032] Figure 4 A three-dimensional schematic diagram of a correction device provided by an embodiment of the utility model;

[0033] Figure 5 A three-dimensional schematic diagram of an upper correction module in a correction device provided by an embodiment of the utility model;

[0034] Figure 6A schematic front view of an upper correction module in a correction device provided by an embodiment of the utility model;

[0035] Figure 7 A side view schematic diagram of an upper correction module in a correction device provided by an embodiment of the utility model;

[0036] Figure 8 A schematic top view of an upper correction module in a correction device provided by an embodiment of the utility model;

[0037] Fig. 9 A three-dimensional schematic diagram of a lower correction module in a correction device provided by an embodiment of the utility model;

[0038] Fig.10 A schematic front view of a lower correction module in a correction device provided by an embodiment of the utility model;

[0039] Fig.11 A side view schematic diagram of a lower correction module in a correction device provided by an embodiment of the utility model;

[0040] Fig.12 A schematic top view of a lower correction module in a correction device provided in an embodiment of the utility model;

[0041] Fig.13 A three-dimensional schematic diagram of another correction device provided by an embodiment of the utility model;

[0042] Fig.14 A front view schematic diagram of another correction device provided in an embodiment of the utility model.

[0043] Reference numerals:

[0044] 1-upper correction module, 11-upper correction piece, 111-pressure head, 1111-lower pressure surface, 12-welding heating element, 13-mounting rod, 2-lower correction module, 21-lower correction piece, 211-top rod, 2111-top pressure surface, 22-cover plate, 221-groove, 222-through hole, 23-base, 3-battery cell, 4-welding strip. DETAILED DESCRIPTION

[0045] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0046] Reference Figure 1 , Figure 2 , Figure 6 and Fig.10 The utility model embodiment discloses a correction device, comprising: at least one upper correction column, comprising a plurality of upper correction members 11 arranged at intervals along a first direction; at least one lower correction column, comprising a plurality of lower correction members 21 arranged at intervals along the first direction; wherein the upper correction member 11 comprises a lower pressure surface 1111 close to the lower correction member 21, and the height of the lower pressure surfaces 1111 of the plurality of upper correction members 11 in the upper correction column gradually increases from the middle of the upper correction column to the two ends of the upper correction column along the first direction; the lower correction member 21 comprises a top pressure surface 2111 close to the upper correction member 11, and the height of the top pressure surface 2111 of the plurality of lower correction members 21 in the lower correction column gradually increases from the middle of the lower correction column to the two ends of the lower correction column along the first direction.

[0047] Specifically, the correction device and the welding device for welding the battery cell 3 may not be integrated into one device, that is, the correction device and the welding device may be two independent devices. The correction device and the welding device for welding the battery cell 3 may also be integrated into one device, in which case the correction device is also used for welding the battery cell 3 and the welding ribbon 4.

[0048] The correction device is preferably also used for welding the battery cell 3 and the welding strip 4. The battery cell 3 can be a back contact battery cell, such as an IBC (Interdigitated Back Contact) battery. The light-receiving surface of the back contact battery cell has no electrode, and the positive and negative electrodes are both arranged on the backlight surface of the battery cell, thereby reducing the shielding of the light-receiving surface of the battery cell by the electrode, increasing the light-receiving area of ​​the light-receiving surface of the battery cell, and improving the energy conversion efficiency of the battery cell.

[0049] The correction device comprises at least one upper correction module 1 and at least one lower correction module 2, wherein the lower correction module 2 is located below the upper correction module 1, the upper correction module 1 comprises at least one upper correction column, and the lower correction module 2 comprises at least one lower correction column. Figure 4 The correction device may include only an upper correction module 1 and a lower correction module 2. In this case, the correction device may be used for welding a single battery cell 3 and a welding strip 4.

[0050] Reference Fig.13 and Fig.14 The correction device may also include a plurality of upper correction modules 1 and a plurality of lower correction modules 2, and the plurality of upper correction modules 1 and the plurality of lower correction modules 2 are arranged along the first direction. In this case, the correction device can be used for welding a plurality of battery cells 3 and welding strips 4 at the same time. The number of upper correction modules 1 and lower correction modules 2 included in the correction device may be equal to the number of battery cells included in the battery string after welding.

[0051] The first direction can refer to Figure 1 , Figure 2 , Figure 4 , Fig.13 and Fig.14 The direction indicated by the arrow A in FIG. The battery cell 3 includes a plurality of pads, and the pads are welded to the welding strips. One welding strip preferably corresponds to one pad column. The number of lower correction members 21 in the lower correction column can be determined according to the number of pads included in the pad column. For example, the number of lower correction members 21 in the lower correction column can be 5-10. The number of upper correction members 11 in the upper correction column can be set according to actual needs. For example, the number of upper correction members 11 in the upper correction column can be four to six.

[0052] The lower pressing surface 1111 on the upper correction member 11 is used to press the front side of the battery cell 3 during welding. The upper pressing surface 2111 on the lower correction member 21 is used to press the welding strip 4 during welding so that the welding strip 4 is in close contact with the welding pad on the battery cell 3. The middle of the upper correction column refers to the middle position of the upper correction column along the first direction. When the number of upper correction members 11 in the upper correction column is 5, the middle of the upper correction column is the position of the middle upper correction member 11. The directions from the middle of the upper correction column to the two ends of the upper correction column along the first direction can be referred to respectively. Figure 6 The arrows in D and E show the directions.

[0053] The middle of the lower correction column refers to the middle position of the lower correction column along the first direction. When the number of lower correction elements 21 in the lower correction column is 7, the middle of the lower correction column is the position of the middlemost lower correction element 21. The directions from the middle of the lower correction column to the two ends of the lower correction column along the first direction can be respectively referred to Fig.10 The directions are shown by arrows in G and F.

[0054] When back-contact cell is welded, since the welding strip is all located on the back side of the back-contact cell, after welding, the cooling and shrinkage of the welding strip will cause the back-contact cell to warp and bend, which will lead to difficulties in subsequent production processes. The warping phenomenon after welding of the back-contact cell refers to the phenomenon that the middle part of the front side of the cell is arched after the back-contact cell is welded on one side.

[0055] In the embodiment of the utility model, through the above arrangement, during the welding and cooling process, the two edges of the front side of the battery cell 3 along the first direction are higher than the middle of the battery cell 3, so that the battery cell 3 presents a bending state with both sides upward during the welding process to offset the warping value of the battery cell 3 during the cooling process. In addition, during the welding process, the battery cell 3 gradually rises from the middle of the battery cell 3 to the two edges of the battery cell 3 along the first direction, so that the battery cell 3 bends more smoothly, so as to reduce the proportion of hidden cracks and broken pieces of the battery cell.

[0056] In the present utility model embodiment, refer to Figure 2, with the cooperation of the upper correction column and the lower correction column, the front side of the battery cell 3 is bent upward on both sides during the welding process, and the welding and cooling are completed. Since the two sides of the front side of the battery cell 3 are always bent upward during the welding and cooling process, the warping value of the battery cell 3 during the cooling process can be effectively offset, thereby reducing the final warping amount of the battery cell 3. It should be noted that the warping of the battery cell 3 during the cooling process refers to the middle part of the front side of the battery cell being arched upward during the cooling process.

[0057] At present, in order to deal with the warping of battery cells, the height of the warping of the battery cells is usually reduced by flattening the battery cells after welding, bending the welding ribbon, etc., or using a welding platform with a concave arc surface to offset the warping of the battery cells during the cooling process after welding. However, the method of flattening the battery cells after welding requires an additional flattening mechanism, and the method of bending the welding ribbon increases the difficulty of welding ribbon preparation, welding ribbon handling and welding, and will affect the welding yield. The welding platform with a concave arc surface is difficult to firmly adsorb the battery cells on the concave arc surface, and the battery cells are prone to offset during the welding process, which leads to poor welding and abnormal battery cell spacing.

[0058] In the embodiment of the utility model, the upper correction column and the lower correction column are used to correct the warping of the battery cell 3 during the welding and cooling process, without the need to set up an additional flattening mechanism, and without the need to bend the welding ribbon, which facilitates the preparation, transportation and fixing of the welding ribbon, and avoids the difficulty of increasing the preparation, transportation and welding of the welding ribbon caused by the bending of the welding ribbon. In addition, there is no need to set a concave arc surface on the welding platform, thereby avoiding poor welding and abnormal spacing between the battery cells caused by the offset of the battery cells during the welding process.

[0059] In a preferred embodiment of the present invention, referring to Figure 1 , Figure 2 , Figure 6 and Fig.10 The lower pressure surfaces 1111 of the multiple upper correction members 11 in the upper correction column are arranged in a downward convex curve along the first direction; the top pressure surfaces 2111 of the multiple lower correction members 21 in the lower correction column are arranged in a downward concave curve along the first direction.

[0060] The curvilinear arrangement of the lower pressure surfaces 1111 of the multiple upper correction members 11 in the upper correction column along the first direction may be a regular curvilinear arrangement or an irregular curvilinear arrangement. The curvilinear arrangement of the top pressure surfaces 2111 of the multiple lower correction members 21 in the lower correction column along the first direction may be a regular curvilinear arrangement or an irregular curvilinear arrangement. The shape of the curve formed by the lower pressure surfaces 1111 of the multiple upper correction members 11 in the upper correction column may be an arc, and the shape of the curve formed by the top pressure surfaces 2111 of the multiple lower correction members 21 in the correction column may be an arc.

[0061] In the embodiment of the utility model, the lower pressure surfaces 1111 of the multiple upper correction members 11 in the upper correction column are arranged in a downward convex curve along the first direction, and the top pressure surfaces 2111 of the multiple lower correction members 21 in the lower correction column are arranged in a downward concave curve along the first direction. Then, with the cooperation of the upper correction column and the lower correction column, the front side of the battery cell 3 is bent upward on both sides during the welding process, and the welding and cooling are completed. Since the two sides of the front side of the battery cell 3 are always in an upward bent state during the welding and cooling process, the warping value of the battery cell 3 during the cooling process can be effectively offset, thereby reducing the final warping amount of the battery cell 3.

[0062] In a preferred embodiment of the present invention, referring to Figure 4 , Figure 5 and Fig. 9 A plurality of upper correction columns are arranged at intervals along the second direction to form an upper correction group corresponding to a single battery cell 3, and a plurality of lower correction columns are arranged at intervals along the second direction to form a lower correction group corresponding to a single battery cell 3, and the second direction is perpendicular to the first direction.

[0063] Specifically, the second direction can refer to Figure 3 , Figure 4 , Fig.13 The direction indicated by the arrow B. The number of upper correction columns included in the upper correction group can be set according to actual needs. For example, the number of upper correction columns included in the upper correction group can be eight to twelve. The number of lower correction columns included in the lower correction group can be determined according to the number of pad columns on the battery cell 3. For example, the number of lower correction columns included in the lower correction group can be 16 to 20. The number of lower correction columns included in the lower correction group is preferably 18. In the embodiment of the utility model, when a single battery cell 3 is welded to multiple welding strips 4, the cooperation of the upper correction group and the lower correction group makes the front side of the single battery cell 3 present a bending state with both sides upward during the welding process, and completes welding and cooling to offset the warping value of the single battery cell 3 during the cooling process, thereby reducing the final warping amount of the single battery cell 3.

[0064] In a preferred embodiment of the present invention, the height difference between the lower pressure surfaces 1111 of two upper correction members 11 adjacent to each other along the first direction in the upper correction column is greater than or equal to 2 mm and less than or equal to 2.5 mm; the height difference between the top pressure surfaces 2111 of two lower correction members 21 adjacent to each other along the first direction in the lower correction column is greater than or equal to 1 mm and less than or equal to 1.5 mm.

[0065] Specifically, when the number of upper correction members 11 in the upper correction column is 5, refer to Figure 6, from left to right, the five upper correction pieces 11 are respectively marked as upper correction piece No. 1, upper correction piece No. 2, upper correction piece No. 3, upper correction piece No. 4 and upper correction piece No. 5. The lower pressing surface 1111 of upper correction piece No. 1 is preferably flush with the lower pressing surface 1111 of upper correction piece No. 5, and the lower pressing surface 1111 of upper correction piece No. 2 is preferably flush with the lower pressing surface 1111 of upper correction piece No. 4. The height difference between the lower pressing surfaces 1111 of two adjacent upper correction pieces 11 in the upper correction column along the first direction can be 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, etc.

[0066] Along the third direction, the height difference between the lower pressing surface 1111 of the No. 1 upper correction piece and the lower pressing surface 1111 of the No. 2 upper correction piece is 2mm-2.5mm, the height difference between the lower pressing surface 1111 of the No. 2 upper correction piece and the lower pressing surface 1111 of the No. 3 upper correction piece is 2mm-2.5mm, the height difference between the lower pressing surface 1111 of the No. 3 upper correction piece and the lower pressing surface 1111 of the No. 4 upper correction piece is 2mm-2.5mm, and the height difference between the lower pressing surface 1111 of the No. 4 upper correction piece and the lower pressing surface 1111 of the No. 5 upper correction piece can be referred to Figure 1 The H1 shown in the figure is 2 mm to 2.5 mm. The third direction is perpendicular to the first direction and the second direction. Figure 3 The arrow in C shows the direction.

[0067] When the number of lower correction elements 21 in the lower correction column is 7, refer to Fig.10 , from left to right, the seven lower correction pieces 21 are respectively marked as lower correction piece No. 1, lower correction piece No. 2, lower correction piece No. 3, lower correction piece No. 4, lower correction piece No. 5, lower correction piece No. 6 and lower correction piece No. 7. The top pressure surface 2111 of lower correction piece No. 1 is preferably flush with the top pressure surface 2111 of lower correction piece No. 7, the top pressure surface 2111 of lower correction piece No. 2 is preferably flush with the top pressure surface 2111 of lower correction piece No. 6, and the top pressure surface 2111 of lower correction piece No. 3 is preferably flush with the top pressure surface 2111 of lower correction piece No. 5. The height difference between the top pressure surfaces 2111 of two adjacent lower correction pieces 21 in the lower correction column along the first direction can be 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, etc.

[0068] Along the third direction, the height difference between the top pressure surface 2111 of the No. 1 lower correction piece and the top pressure surface 2111 of the No. 2 lower correction piece is 1mm-1.5mm, the height difference between the top pressure surface 2111 of the No. 2 lower correction piece and the top pressure surface 2111 of the No. 3 lower correction piece is 1mm-1.5mm, and the height difference between the top pressure surface 2111 of the No. 3 lower correction piece and the top pressure surface 2111 of the No. 4 lower correction piece is 1mm-1.5mm. The height difference between the top pressure surface 2111 of the No. 5 lower correction piece and the top pressure surface 2111 of the No. 6 lower correction piece can be referred to Fig.10H2 shown in , H2 is 1mm-1.5mm.

[0069] In the embodiment of the utility model, when the height difference between the lower pressure surfaces 1111 of two adjacent upper correction members 11 and the height difference between the top pressure surfaces 2111 of two adjacent lower correction members 21 are within the above-mentioned range, the deformation amplitude of the battery cell 3 during welding can be within an appropriate range, and the gradual deformation degree of each part of the battery cell can be relatively gentle, thereby preventing the occurrence of problems such as cracks.

[0070] In a preferred embodiment of the present utility model, the lower pressure surfaces 1111 of the multiple upper correction members 11 in the upper correction column are arranged in an arc shape along the first direction, and the curvature of the arc formed by the lower pressure surfaces 1111 of the multiple upper correction members 11 in the upper correction column is 0.4rad-0.9rad; the top pressure surfaces 2111 of the multiple lower correction members 21 in the lower correction column are arranged in an arc shape along the first direction, and the curvature of the arc formed by the top pressure surfaces 2111 of the multiple lower correction members 21 in the lower correction column is 0.2rad-0.5rad.

[0071] Specifically, the curvature of the arc is the arc length divided by the radius. The curvature of the arc formed by the lower pressure surfaces 1111 of the multiple upper correction members 11 in the upper correction column can be 0.4rad, 0.443rad, 0.5rad, 0.6rad, 0.887rad, 0.9rad, etc. The curvature of the arc formed by the top pressure surfaces 2111 of the multiple lower correction members 21 in the lower correction column can be 0.2rad, 0.261rad, 0.3rad, 0.4rad, 0.4rad, 0.473rad, 0.5rad, etc. When the curvature of the arc formed by the lower pressure surfaces 1111 of the multiple upper correction members 11 in the upper correction column and the curvature of the arc formed by the top pressure surfaces 2111 of the multiple lower correction members 21 in the lower correction column are within the above range, the deformation amplitude of the battery cell 3 during the welding process can be within a suitable range, and the gradual degree of deformation of each part of the battery cell can be relatively gentle, preventing the occurrence of cracks and other problems.

[0072] In a preferred embodiment of the present invention, referring to Figure 6 and Fig.10 The upper correction piece 11 includes a pressure head 111 and a first spring connected to the pressure head 111, and the lower pressure surface 1111 is a surface on the pressure head 111 close to the lower correction piece 21; the lower correction piece 21 includes a push rod 211 and a second spring connected to the push rod 211, and the top pressure surface 2111 is a surface on the push rod 211 close to the upper correction piece 11.

[0073] At present, when the flattening method is applied to thinner battery cells, the proportion of hidden cracks and broken pieces of the battery cells will increase. In the embodiment of the utility model, the upper correction member 11 includes a first spring, and the lower correction member 21 includes a second spring, so that the force on the battery cell 3 during bending deformation is relatively gentle, thereby reducing the proportion of hidden cracks and broken pieces of the battery cell 3 during bending deformation.

[0074] In a preferred embodiment of the present invention, the spring weight of the first springs in the multiple upper correction parts 11 in the upper correction column gradually decreases from the middle of the upper correction column to the two ends of the upper correction column along the first direction; the spring weight of the second springs in the multiple lower correction parts 21 in the lower correction column gradually increases from the middle of the lower correction column to the two ends of the lower correction column along the first direction.

[0075] Specifically, the spring weight of the first spring in the upper correction member 11 can be set according to actual needs, for example, the spring weight of the first spring in the upper correction member 11 can be 20g / mm-25g / mm. The spring weight of the second spring in the lower correction member 21 can be set according to actual needs, for example, the spring weight of the second spring in the lower correction member 21 can be 15g / mm-25g / mm. When the spring weights of the first springs in the multiple upper correction members 11 in the upper correction column and the spring weights of the second springs in the multiple lower correction members 21 in the lower correction column meet the above requirements, the pressure of the upper correction member 11 and the lower correction member 21 on the battery cell 3 can be optimized.

[0076] In a preferred embodiment of the present invention, referring to Figure 6 , from the middle of the upper correction column to the two ends of the upper correction column along the first direction, the lengths of the plurality of upper correction members 11 in the upper correction column gradually decrease.

[0077] Specifically, the length of the upper correction member 11 can refer to Figure 6 L shown in . The lengths of the upper correction pieces No. 1 and No. 5 are the shortest, and the lengths of the upper correction pieces No. 1 and No. 5 can both be 35mm-40mm. The lengths of the upper correction pieces No. 2 and No. 4 can both be 37mm-42.5mm, and the difference between the lengths of the upper correction pieces No. 2 and No. 4 and the lengths of the upper correction pieces No. 1 and No. 5 is 2mm-2.5mm. The length of the upper correction piece No. 3 is the longest, and the length of the upper correction piece No. 3 can be 39mm-44.5mm, and the difference between the lengths of the upper correction piece No. 3 and the lengths of the upper correction pieces No. 1 and No. 5 is 4mm-4.5mm. In the embodiment of the utility model, by gradually reducing the lengths of the multiple upper correction pieces 11 in the upper correction column from the middle of the upper correction column to the two ends of the upper correction column along the first direction, the lower pressure surfaces 1111 of the multiple upper correction pieces 11 in the upper correction column are gradually raised. In addition, by adjusting the length of the upper correction piece 11, the height of the lower pressure surface 1111 of the upper correction piece 11 can be adjusted to adjust the deformation amplitude of the battery cell 3.

[0078] In a preferred embodiment of the present invention, the correction device also includes a lifting mechanism connected to the lower correction piece 21, and the lifting mechanism is used to drive the lower correction piece 21 to rise and fall along a third direction, and the third direction is perpendicular to the first direction and the second direction; and / or, the length of multiple lower correction pieces 21 in the lower correction column gradually increases from the middle of the lower correction column to the two ends of the lower correction column along the first direction.

[0079] Specifically, the lengths of the multiple lower correction members 21 in the lower correction column may be equal or different. When the lengths of the multiple lower correction members 21 in the lower correction column are equal, when the lifting mechanism drives the lower correction members 21 to rise, the final ejection amounts of different lower correction members 21 in the lower correction column are different, so that the heights of the top pressure surfaces of the multiple lower correction members 21 in the lower correction column gradually increase from the middle of the lower correction column to the two ends of the lower correction column along the first direction.

[0080] When the lengths of the multiple lower correction pieces 21 in the lower correction column are unequal, for example, when the lengths of the multiple lower correction pieces 21 in the lower correction column gradually increase from the middle of the lower correction column to the two ends of the lower correction column along the first direction, when the lifting mechanism drives the lower correction pieces 21 to rise, the final ejection amounts of different lower correction pieces 21 in the lower correction column can be the same.

[0081] The lifting mechanism includes a driving member, which may be a cylinder, a motor, etc. The lower correction module 2 also includes a cover plate 22 and a base 23, and the base 23 is the base of the lower correction module 2. The ejection amount of the lower correction member 21 specifically refers to the distance that the lifting mechanism drives the lower correction member 21 to move along the third direction.

[0082] When the lengths of multiple lower correction parts 21 in the lower correction column are equal, the ejection amount of lower correction part No. 1 and lower correction part No. 7 is the largest, the ejection amount of lower correction part No. 2 and lower correction part No. 6 is smaller than the ejection amount of lower correction part No. 1 and lower correction part No. 7, the ejection amount of lower correction part No. 3 and lower correction part No. 5 is smaller than the ejection amount of lower correction part No. 2 and lower correction part No. 6, and the ejection amount of lower correction part No. 4 is the smallest.

[0083] Along the third direction, the distance between the top pressure surface 2111 of the No. 1 lower correction piece and the No. 7 lower correction piece and the upper surface of the cover plate 22 can be 4mm-6mm. Along the third direction, the distance between the top pressure surface 2111 of the No. 2 lower correction piece and the No. 6 lower correction piece and the upper surface of the cover plate 22 can be 2.5mm-5mm, and the difference between the distance between the top pressure surface 2111 of the No. 1 lower correction piece and the No. 7 lower correction piece and the upper surface of the cover plate 22 and the distance between the top pressure surface 2111 of the No. 2 lower correction piece and the No. 6 lower correction piece and the upper surface of the cover plate 22 can be 1mm-1.5mm. Along the third direction, the distance between the top pressure surface 2111 of the No. 3 and No. 5 lower correction parts and the upper surface of the cover plate 22 may be 1.5 mm-4 mm, and the difference between the distance between the top pressure surface 2111 of the No. 1 and No. 7 lower correction parts and the upper surface of the cover plate 22 and the distance between the top pressure surface 2111 of the No. 3 and No. 5 lower correction parts and the upper surface of the cover plate 22 may be 2 mm-2.5 mm. Along the third direction, the distance between the top pressure surface 2111 of the No. 4 lower correction part and the upper surface of the cover plate 22 may be 0.5 mm-3 mm, and the difference between the distance between the top pressure surface 2111 of the No. 1 and No. 7 lower correction parts and the upper surface of the cover plate 22 and the distance between the top pressure surface 2111 of the No. 4 lower correction part and the upper surface of the cover plate 22 may be 3 mm-3.5 mm.

[0084] By setting the lifting mechanism, the ejection amount of different lower correction pieces 21 in the lower correction column can be adjusted, and then the height of the top pressure surface 2111 of the lower correction piece 21 can be adjusted when the lengths of multiple lower correction pieces 21 in the lower correction column are equal, so as to adjust the deformation amplitude of the battery cell 3. The correction device can adjust the deformation amplitude of the battery cell 3 by adjusting the length of the upper correction piece 11 and the ejection amount of the lower correction piece 21.

[0085] Reference Figure 8 The upper correction module 1 also includes a plurality of welding heating elements 12, and the plurality of welding heating elements 12 are arranged at intervals along the first direction. The welding heating element 12 is used to provide a heat source when welding the battery cell. The welding heating element 12 can be an infrared lamp tube, or a laser emitter, a hot air emitter, etc. The infrared lamp tube can generate infrared radiation when turned on to increase the local temperature to complete the welding of the battery cell and the welding strip. The number of welding heating elements 12 can be set according to actual needs. For example, the number of welding heating elements 12 can be set to two, three, four, five, etc. Refer to Figures 6 to 8 The upper correction mold 1 further comprises a plurality of mounting rods 13, on which the upper correction member 11 is mounted, and the plurality of mounting rods 13 are arranged at intervals along the first direction. A welding heating element 12 is preferably located between two mounting rods 13. The number of mounting rods 13 is determined according to the number of rows of the upper correction group, for example, the number of mounting rods 13 may be four to six.

[0086] Reference Figures 9 to 12 The cover plate 22 is provided with a plurality of grooves 221, which are arranged at intervals along the second direction and extend along the first direction. The grooves 221 are used to place the welding strips 4. The cover plate 22 is also provided with a plurality of through holes 222, which are used for the lower correction piece 21 to pass through. Before the welding strip 4 is placed in the groove 221, the lower correction piece 21 is in a retracted state, and the top pressure surface 2111 on the lower correction piece 21 is located below the groove 221. After the welding strip 4 is placed in the groove 221, when welding is performed, the lifting mechanism drives the lower correction piece 21 to rise until the lower correction piece 21 is in a Fig.10 When the lower correction member 21 is in the ejected state, the pressing surface 2111 is higher than the upper surface of the cover plate 22 .

[0087] Before welding, the welding ribbon 4 is placed in the groove 221, and the pressing surface 2111 on the lower correction member 21 is located below the groove 221. During welding, the upper correction module 1 moves downward, so that the upper correction member 11 is pressed to the front of the battery cell 3, and the lower correction member 21 in the lower correction module 2 rises, pushing out the welding ribbon 4 in the groove 221 and making the welding ribbon 4 contact with the pad on the battery cell 3.

[0088] During the infrared lamp heating welding process, since the ejection amount of the lower correction pieces 21 on both sides of the lower correction module 2 is greater than the ejection amount of the lower correction piece 21 in the middle, and the length of the upper correction pieces 11 on both sides of the upper correction module 1 is less than the length of the upper correction piece 11 in the middle, the cooperation between the upper correction column and the lower correction column makes the battery cell 3 present as follows during the welding process. Figure 2 The two sides of the front of the battery cell are shown to be bent upward, and welding and cooling are completed. Since the two sides of the front of the battery cell 3 are always bent upward during the welding and cooling process, the warping value of the battery cell 3 during the cooling process can be effectively offset, thereby reducing the final warping amount of the battery cell 3.

[0089] It should be noted that the battery cell 3 may be bent upward with a deformation amplitude of 2 mm to 4 mm during the welding process, wherein the deformation amplitude may specifically be the distance between the lowest point and the highest point of the battery cell 3 along the third direction.

[0090] The cover plate 22 is also provided with vacuum adsorption holes, which are used to adsorb and fix the battery cell 3 after it is placed.

[0091] In a preferred embodiment of the present invention, referring to Fig.13 and Fig.14 The number of the upper correction group and the number of the lower correction group are multiple, and the multiple upper correction groups and the multiple lower correction groups are arranged at intervals along the first direction.

[0092] The lower pressing surfaces 1111 of the multiple upper correction members 11 in the upper correction column in each upper correction group are arranged in a downward convex curve along the first direction, so the lower pressing surfaces 1111 of the multiple upper correction members 11 in the multiple upper correction columns in the multiple upper correction groups are arranged in a periodic curve along the first direction.

[0093] The top pressure surfaces 2111 of the multiple lower correction members 21 in the lower correction column in each lower correction group are arranged in a downward concave curve along the first direction, and the top pressure surfaces 2111 of the multiple lower correction members 21 in the multiple lower correction columns in the multiple lower correction groups are arranged in a periodic curve along the first direction. In the embodiment of the utility model, when there are multiple upper correction groups and multiple lower correction groups, multiple battery cells 3 and welding strips 4 can be welded at the same time, thereby improving welding efficiency.

[0094] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0095] The embodiments of the utility model are described above in conjunction with the accompanying drawings, but the utility model is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the utility model, ordinary technicians in this field can also make many forms without departing from the scope of protection of the utility model and the claims, which all fall within the protection of the utility model.

Claims

1. A correction device, characterized in that: include: at least one upper correction column, comprising a plurality of upper correction members spaced apart along a first direction; at least one lower correction column, comprising a plurality of lower correction members spaced apart along the first direction; Wherein, the upper correction member comprises a lower pressure surface close to the lower correction member, and the heights of the lower pressure surfaces of the plurality of upper correction members in the upper correction member column gradually increase from the middle of the upper correction member column to the two ends of the upper correction member column along the first direction; The lower correction member includes a top pressure surface close to the upper correction member, and the heights of the top pressure surfaces of the plurality of lower correction members in the lower correction member column gradually increase from the middle of the lower correction member column to both ends of the lower correction member column along the first direction.

2. The correction device according to claim 1, characterized in that The lower pressing surfaces of the plurality of upper correction members in the upper correction column are arranged in a downwardly convex curve along the first direction; The top pressure surfaces of the plurality of lower correction members in the lower correction row are arranged in a downwardly concave curve along the first direction.

3. The correction device according to claim 1, characterized in that The correction device is used for welding the battery cell, and the correction device also includes a welding heating element, and the welding heating element is used to provide a heat source when welding the battery cell.

4. The correction device according to any one of claims 1 to 3, characterized in that A plurality of the upper correction columns are arranged at intervals along a second direction to form an upper correction group corresponding to a single battery cell, and a plurality of the lower correction columns are arranged at intervals along the second direction to form a lower correction group corresponding to a single battery cell, and the second direction is perpendicular to the first direction.

5. The correction device according to claim 1, characterized in that The height difference between the lower pressure surfaces of two adjacent upper correction members in the upper correction column along the first direction is greater than or equal to 2 mm and less than or equal to 2.5 mm; The height difference between the top pressure surfaces of two adjacent lower correction members in the lower correction row along the first direction is greater than or equal to 1 mm and less than or equal to 1.5 mm.

6. The correction device according to claim 2, characterized in that The lower pressure surfaces of the plurality of upper correction members in the upper correction column are arranged in an arc shape along the first direction, and the arc angle of the lower pressure surfaces of the plurality of upper correction members in the upper correction column is 0.4 rad-0.9 rad; The top pressure surfaces of the multiple lower correction members in the lower correction column are arranged in an arc shape along the first direction, and the arc of the top pressure surfaces of the multiple lower correction members in the lower correction column has an arc angle of 0.2 rad-0.5 rad.

7. The correction device according to claim 1, characterized in that The upper correction member includes a pressure head and a first spring connected to the pressure head, and the lower pressure surface is a surface of the pressure head close to the lower correction member; The lower correction member includes a push rod and a second spring connected to the push rod, and the pressing surface is a surface of the push rod close to the upper correction member.

8. The correction device according to claim 7, characterized in that From the middle of the upper correction column to the two ends of the upper correction column along the first direction, the spring weight of the first springs in the plurality of upper correction members in the upper correction column gradually decreases; From the middle of the lower correction column to the two ends of the lower correction column along the first direction, the spring weights of the second springs in the plurality of lower correction members in the lower correction column gradually increase.

9. The correction device according to claim 1, characterized in that From the middle of the upper correction row to the two ends of the upper correction row along the first direction, the lengths of the plurality of upper correction pieces in the upper correction row gradually decrease.

10. The correction device according to claim 1, characterized in that It also includes a lifting mechanism connected to the lower correction member, the lifting mechanism is used to drive the lower correction member to rise and fall along a third direction, and the third direction is perpendicular to the first direction and the second direction; And / or, the lengths of the plurality of lower correction members in the lower correction row gradually increase from the middle of the lower correction row to both ends of the lower correction row along the first direction.

11. The correction device according to claim 4, characterized in that There are multiple upper correction groups and multiple lower correction groups, and the multiple upper correction groups and the multiple lower correction groups are arranged at intervals along the first direction.

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