Connecting piece and battery

Abstract

The utility model provides a connecting piece and a battery, the connecting piece comprises a pole connecting part and at least one tab connecting part, and the pole connecting part is used for being connected with a pole; the tab connecting part comprises a first connecting plate and a first bent plate which are integrally connected, the first connecting plate and the first bent plate are stacked, and one end of the first connecting plate is connected with the pole connecting part; wherein one side, deviating from the first bent plate, of the first connecting plate is provided with a first side surface, one side, deviating from the first connecting plate, of the first bent plate is provided with a second side surface, and the first side surface or the second side surface is used for being connected with a tab. According to the embodiment of the invention, the first connecting plate and the first bent plate of the tab connecting part are integrally connected and stacked, so that the thickness of the tab connecting part can be increased, and a single-layer plate structure can be kept in an area with low requirement on the thickness of the connecting sheet, thereby reducing the material consumption of the connecting sheet and lowering the cost of the connecting sheet.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a connecting sheet and a battery. Background Art

[0002] In the related art, the battery cell is usually arranged in a shell, and the tab of the battery cell is connected to the pole arranged on the top cover of the shell through a connecting piece. The tab of the battery cell and the connecting piece can be connected together by welding. In order to ensure the welding strength between the tab of the battery cell and the connecting piece, the connecting piece needs to have a larger thickness to facilitate the connection stability between the connecting piece and the tab of the battery cell. However, the increase in the thickness of the connecting piece will lead to an increase in the material used for the connecting piece. Utility Model Content

[0003] The embodiments of the present application provide a connecting sheet and a battery, which can improve the technical problem that in order to ensure the connection stability between the connecting sheet and the tab, the connecting sheet needs to have a larger thickness, which leads to an increase in the material used for the connecting sheet.

[0004] In a first aspect, an embodiment of the present application provides a connecting sheet, comprising:

[0005] A pole connecting portion, used for connecting to a pole;

[0006] At least one pole lug connection portion, the pole lug connection portion comprising a first connecting plate and a first bent plate connected in one piece, the first connecting plate and the first bent plate being stacked, and one end of the first connecting plate being connected to the pole connection portion;

[0007] The first connecting plate has a first side surface on a side facing away from the first bending plate, and the first bending plate has a second side surface on a side facing away from the first connecting plate. The first side surface or the second side surface is used for connecting with the pole lug.

[0008] In one embodiment, the connecting piece includes two tab connecting portions.

[0009] In one embodiment, the two tab connection portions are sequentially distributed along the third direction, the first bent plate includes a first edge for connecting with the first connection plate, and the first edge is located at one side of the first bent plate along the third direction;

[0010] There is a gap between the two tab connecting portions, and the first edge is located on a side of the first bent plate close to the gap; or,

[0011] Wherein, the first edges of the two first bent plates are located on a side of the two first bent plates away from each other.

[0012] In one embodiment, the first connecting plate and the first bending plate are stacked along the first direction, one end of the first connecting plate along the second direction is connected to the pole connecting portion, and the first direction, the second direction and the third direction are arranged at angles to each other; the width of the gap in the third direction is greater than or equal to the sum of the widths of the two first bending plates in the third direction.

[0013] In one embodiment, a distance between the first side surface and the second side surface is H1, wherein H1 ≥ 0.8 mm.

[0014] In one embodiment, the thickness of the first connecting plate is greater than or equal to 0.4 mm; the thickness of the first connecting plate is less than or equal to 1.2 mm; and / or,

[0015] The thickness of the first bent plate is greater than or equal to 0.4 mm; the thickness of the first bent plate is less than or equal to 1.2 mm.

[0016] In one embodiment, the distance between the first side surface and the second side surface is H1, wherein the ratio of H1 to the thickness of the first connecting plate or the thickness of the first bent plate is T, and 2≤T≤2.5.

[0017] In one embodiment, the first connecting plate and the first bending plate are stacked along a first direction, and one end of the first connecting plate along a second direction is connected to the pole connecting portion; wherein,

[0018] The width of the first side surface in the third direction is greater than or equal to 5 mm, and the first direction and the second direction are respectively arranged at an angle with the third direction; and / or,

[0019] The width of the second side surface in the third direction is greater than or equal to 5 mm, and the first direction and the second direction are respectively arranged at an angle with the third direction.

[0020] In one embodiment, the pole connecting portion includes a second connecting plate and a second bent plate, the second bent plate and the second connecting plate are stacked along a first direction, one end of the second connecting plate along a second direction is connected to one end of the first connecting plate along the second direction, and the second connecting plate is used to be connected to the pole.

[0021] In one embodiment, the second bending plate includes a second edge for connecting to the second connecting plate, the second edge is located on one side of the second bending plate along a third direction, and the first direction and the second direction are respectively arranged at an angle to the third direction.

[0022] In one embodiment, the second connecting plate includes a connecting portion for connecting to a pole; the pole connecting portion includes two second bent plates, and the two second bent plates are distributed on both sides of the connecting portion along the third direction.

[0023] In one embodiment, the first bent plate and the second bent plate are located on the same side of the connecting sheet.

[0024] In a second aspect, an embodiment of the present application provides a battery, comprising:

[0025] The housing comprises a top cover, wherein the top cover is provided with a pole;

[0026] A battery cell is disposed in the housing, and the battery cell includes a tab;

[0027] A connecting piece, the connecting piece is the connecting piece as described above, the connecting piece is located between the battery cell and the top cover, the connecting piece includes a pole connecting part and at least one pole ear connecting part, the pole connecting part is used to connect to the pole; the pole ear connecting part includes a first connecting plate and a first bent plate that are integrally connected, the first connecting plate and the first bent plate are stacked, and one end of the first connecting plate is connected to the pole connecting part; wherein, the first connecting plate has a first side surface on the side facing away from the first bent plate, and the first bent plate has a second side surface on the side facing away from the first connecting plate, and the first side surface or the second side surface is used to connect to the pole ear.

[0028] Beneficial effects of the embodiments of the present application:

[0029] The connecting piece provided in the embodiment of the present application is configured such that the pole lug connecting portion includes a first connecting plate and a first bent plate connected as one body, and the first connecting plate and the first bent plate are stacked, and the first side surface of the first connecting plate or the second side surface of the second connecting plate is used to connect to the pole lug of the battery cell, so as to realize the connection between the pole lug connecting portion and the pole lug of the battery cell. The stacking of the first connecting plate and the first bent plate can increase the thickness of the pole lug connecting portion in the first direction, thereby improving the connection stability between the pole lug connecting portion and the pole lug of the battery cell. The area of ​​the connecting piece that does not require high thickness can maintain a single-layer plate structure, thereby reducing the material used in the area of ​​the connecting piece that does not require high thickness, thereby reducing the cost of the connecting piece.

[0030] In the battery provided in the embodiment of the present application, the connecting piece connecting the pole column and the pole lug of the battery cell includes a first connecting plate and a first bent plate connected as one body, and the first connecting plate and the first bent plate are stacked, and the first side of the first connecting plate or the second side of the second connecting plate is connected to the pole lug of the battery cell, so that the thickness of the pole lug connecting part can be increased, thereby improving the connection stability between the pole lug connecting part and the pole lug of the battery cell. At the same time, the area of ​​the connecting piece that does not require high thickness can maintain a single-layer plate structure, thereby reducing the material used in the area of ​​the connecting piece that does not require high thickness, thereby reducing the cost of the connecting piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 1 is a schematic structural diagram of an embodiment of a battery provided in an embodiment of the present application, wherein a partial structure of a battery housing is not shown;

[0033] Figure 2 yes Figure 1 The cross-sectional view along the AA direction;

[0034] Figure 3 is a schematic structural diagram of an embodiment of a connecting sheet provided in an embodiment of the present application;

[0035] Figure 4 yes Figure 3 A side view of the connecting piece along a third direction;

[0036] Figure 5 The embodiment of the present application provides a method for folding and forming Figure 3 Schematic diagram of the flat plate structure of the middle connecting piece;

[0037] Figure 6 A schematic structural diagram of another embodiment of a connecting sheet provided in an embodiment of the present application;

[0038] Figure 7 The embodiment of the present application provides a method for folding and forming Figure 6 Schematic diagram of the flat plate structure of the middle connecting piece;

[0039] Figure 8 It is a schematic diagram of the structure after the battery cell tab of the battery provided in the embodiment of the present application is connected to the tab connecting portion of the connecting sheet;

[0040] Fig. 9 yes Figure 8The schematic diagram of the structure after the top cover is omitted;

[0041] Fig.10 yes Figure 1 Schematic diagram of the structure after the top cover is omitted.

[0042] Battery 100; top cover 110; pole 120; battery cell 130; pole ear 131; connecting piece 140; pole ear connecting portion 141; first connecting plate 1411; first side 1412; first bending plate 1413; second side 1415; first edge 1416; gap 1417; pole connecting portion 142; second connecting plate 1421; connecting portion 1422; through hole 1423; third side 1424; second bending plate 1425; second edge 1426; fourth side 1427; fuse portion 143; fuse slot 1431; first flat plate structure 200; first folding line 210; dividing seam 220; second flat plate structure 300; second folding line 310; first direction X; second direction Y; third direction Z. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise stated, the directional words such as "upper" and "lower" used generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0044] The battery cell is usually arranged in a shell, and the tab of the battery cell is connected to the pole arranged on the top cover of the shell through a connecting piece. The tab of the battery cell and the connecting piece can be connected together by welding to reduce the bending of the connecting piece and simplify the connection process of the tab of the battery cell and the connecting piece. In order to ensure the welding strength between the tab of the battery cell and the connecting piece, the part of the connecting piece used to connect with the tab needs to have a larger thickness to facilitate penetration welding of the connecting piece and the tab of the battery cell.

[0045] In the related art, in order to ensure that the portion of the connecting sheet used for connecting with the tab has a greater thickness, the overall thickness of the connecting sheet is usually made thicker. However, the increase in the thickness of the connecting sheet will lead to an increase in the material used for the connecting sheet, resulting in higher costs.

[0046] In order to avoid the above problems, an embodiment of the present application provides a connecting sheet.

[0047] Figure 1 It is a schematic structural diagram of an embodiment of a battery provided in an embodiment of the present application, wherein a partial structure of the battery shell is not shown. Figure 2 yes Figure 1 The cross-sectional view along the AA direction. Figure 1 and Figure 2 As shown, the battery 100 includes a shell, a battery cell 130 and a connecting piece 140, and the shell includes a top cover 110, and the top cover 110 is provided with a pole 120. The battery cell 130 is arranged in the shell, and the battery cell 130 includes a pole ear 131. The battery cell 130 is a bare battery cell. The number of the battery cells 130 can be one or more. The connecting piece 140 is located between the battery cell 130 and the top cover 110, and the pole ear 131 of the battery cell 130 is connected to the pole 120 through the connecting piece 140. Among them, the pole ears 131 of multiple battery cells 130 can be connected to one pole 120 through the connecting piece 140, and the pole ear 131 of one battery cell 130 can also be connected to one pole 120 through the connecting piece 140.

[0048] It should be noted that the positive electrode column of the battery 100 can be connected to the positive electrode ear of the battery cell 130 through the connecting piece 140, and the negative electrode column of the battery 100 can be connected to the negative electrode ear of the battery cell 130 through another connecting piece 140. Alternatively, only the positive electrode column of the battery 100 can be connected to the positive electrode ear of the battery cell 130 through the connecting piece 140, or only the negative electrode column of the battery 100 can be connected to the negative electrode ear of the battery cell 130 through the connecting piece 140.

[0049] like Figure 2 and Figure 3 As shown, the connecting sheet 140 may include a pole connecting portion 142 and at least one pole lug connecting portion 141, the pole connecting portion 142 is connected to the pole lug connecting portion 141, the pole connecting portion 142 is used to connect to the pole 120, and the pole lug connecting portion 141 is used to connect to the pole lug 131 of the battery cell 130, thereby realizing the connection between the pole lug 131 of the battery cell 130 and the pole 120 through the connecting sheet 140.

[0050] In some embodiments, the tab connection portion 141 of the connection sheet 140 includes a first connection plate 1411, one end of which is connected to the pole connection portion 142, so that the tab connection portion 141 is connected to the pole connection portion 142. The tab connection portion 141 also includes a first bent plate 1413 integrally connected to the first connection plate 1411, and the first connection plate 1411 and the first bent plate 1413 are stacked. The first connection plate 1411 and the second connection plate 1421 are used to connect to the tab 131 of the battery cell 130, so that the tab connection portion 141 is connected to the tab 131 of the battery cell 130.

[0051] Among them, Figure 3 and Figure 4As shown, the first connecting plate 1411 has a first side 1412 on the side facing away from the first bending plate 1413, and the first bending plate 1413 has a second side 1415 on the side facing away from the first connecting plate 1411. The first side 1412 or the second side 1415 is used to connect to the pole ear 131 of the battery cell 130, so that the first connecting plate 1411 or the second connecting plate 1421 is connected to the pole ear 131 of the battery cell 130.

[0052] The connecting sheet 140 provided in the embodiment of the present application is configured such that the pole ear connecting portion 141 includes a first connecting plate 1411 and a first bending plate 1413 that are connected as a whole, and the first connecting plate 1411 and the first bending plate 1413 are stacked, and the first side surface 1412 of the first connecting plate 1411 or the second side surface 1415 of the second connecting plate 1421 is used to connect to the pole ear 131 of the battery cell 130, so as to realize the connection between the pole ear connecting portion 141 and the pole ear 131 of the battery cell 130.

[0053] The first connecting plate 1411 and the first bent plate 1413 are stacked so that the tab connection portion 141 is a double-layer plate structure, which can increase the overall thickness of the tab connection portion 141 and improve the connection stability between the tab connection portion 141 and the tab 131 of the battery cell 130. The area of ​​the connecting sheet 140 that does not require high thickness can maintain a single-layer plate structure, thereby reducing the material used in the area of ​​the connecting sheet 140 that does not require high thickness, thereby reducing the cost and weight of the connecting sheet 140, and further reducing the cost and weight of the battery 100.

[0054] Moreover, the first connecting plate 1411 and the second connecting plate 1421 are integrally connected, and the first flat plate structure 200 connected to the pole connecting part 142 can be folded to form a stacked first connecting plate 1411 and a first bent plate 1413, thereby increasing the overall thickness of the pole ear connecting part 141 while allowing the connecting plate 140 to maintain a single-layer plate structure in areas where the thickness requirement is not high, which is very convenient to process and is beneficial to improving the production efficiency of the connecting plate 140.

[0055] In some embodiments, the first connection plate 1411 and the first bent plate 1413 of the tab connection portion 141 may be stacked along the first direction X. One end of the first connection plate 1411 along the second direction Y is connected to the pole connection portion 142 .

[0056] like Figure 3 As shown, the first bent plate 1413 of the tab connection portion 141 includes a first edge 1416 for connecting to the first connecting plate 1411, that is, the first bent plate 1413 of the tab connection portion 141 is integrally connected to the first connecting plate 1411 at the first edge 1416. Figure 5As shown, the pole lug connection portion 141 can be formed by folding the first flat plate structure 200 along the first folding line 210 to form a first connecting plate 1411 and a first bent plate 1413 arranged in a stacked manner, and the first folding line 210 is located at the first edge 1416. The first edge 1416 of the first bent plate 1413 can be located on one side of the first bent plate 1413 along the third direction Z, or on one side of the first bent plate 1413 along the first connecting plate 1411 away from the pole connection portion 142. The first direction X, the second direction Y and the third direction Z are arranged at an angle to each other.

[0057] When the first edge 1416 of the first bent plate 1413 is located on one side of the first bent plate 1413 along the third direction Z, the first edge 1416 of the first bent plate 1413 can be extended along the second direction Y, that is, the first folding line 210 of the first flat plate structure 200 extends along the second direction Y. When the first edge 1416 of the first bent plate 1413 is located on one side of the first bent plate 1413 along the direction of the first connecting plate 1411 away from the pole connecting portion 142, the first edge 1416 of the first bent plate 1413 can be extended along the third direction Z, that is, the first folding line 210 of the first flat plate structure 200 extends along the third direction Z.

[0058] In some embodiments, the connecting piece 140 may include at least two tab connecting portions 141. Thus, the multiple tab connecting portions 141 may be connected to the tabs 131 of the multiple battery cells 130 in a one-to-one correspondence, and the distribution direction of the multiple battery cells 130 is consistent with the distribution direction of the multiple tab connecting portions 141. The connecting piece 140 may include two, three or more tab connecting portions 141. Of course, the connecting piece 140 may also include only one tab connecting portion 141.

[0059] Among them, the plurality of tab connections 141 can be distributed in sequence along the third direction Z. The first edge 1416 of the first bent plate 1413 of the plurality of tab connections 141 can be located on one side of the first bent plate 1413 along the third direction Z. That is, the first folding line 210 of the first flat plate structure 200 used for bending to form the tab connection 141 extends along the second direction Y. Thus, the flat plate used for forming the plurality of tab connections 141 can be divided into a plurality of first flat plate structures 200 by the dividing seam 220 extending along the second direction Y, and then each first flat plate structure 200 is bent along the first folding line 210 extending along the second direction Y, so as to form the first connecting plate 1411 and the first bent plate 1413 of the plurality of tab connections 141.

[0060] Alternatively, the first edge 1416 of the first bent plate 1413 of the plurality of tab connection parts 141 may be located on the side of the first bent plate 1413 along the first connecting plate 1411 away from the pole connection part 142. That is, the first folding line 210 of the first flat plate structure 200 used for bending to form the tab connection part 141 is located on the side of the first connecting plate 1411 away from the pole connection part 142 along the second direction Y, and extends along the third direction Z. Thus, the flat plate used for forming the plurality of tab connection parts 141 can be divided into a plurality of first flat plate structures 200 by the dividing seam 220 extending along the second direction Y, and then each first flat plate structure 200 is bent at the first folding line 210 extending along the second direction Y, so as to form the first connecting plate 1411 and the first bent plate 1413 of the plurality of tab connection parts 141.

[0061] It should be noted that the multiple first flat plate structures 200 can be bent toward the same side at the first folding line 210, so that the first bent plates 1413 of the multiple tab connecting parts 141 are located on the same side of the connecting piece 140. Alternatively, a part of the multiple first flat plate structures 200 can be bent toward one side at the first folding line 210, and the other part can be bent toward the other side at the first folding line 210, so that the first bent plates 1413 of the multiple tab connecting parts 141 are located on opposite sides of the connecting piece 140. Of course, the former can further reduce the overall thickness of the connecting piece 140 in the first direction X, which is conducive to reducing the volume of the battery 100.

[0062] In some embodiments, Figure 3 and Figure 4 As shown, the connecting sheet 140 may include two tab connecting portions 141. The tabs 131 of the two battery cells 130 may be connected to the two tab connecting portions 141 of the connecting sheet 140 in a one-to-one correspondence. Figure 3 , Figure 8 and Fig. 9 As shown, the two tab connection parts 141 of the connection sheet 140 are sequentially distributed along the third direction Z. The two battery cells 130 can be placed on both sides of the connection sheet 140, and the tabs 131 of the two battery cells 130 are attached to the first side 1412 (or the second side 1415) of the two tab connection parts 141, and then the tabs 131 and the tab connection parts 141 are welded and connected by laser welding or other welding methods. Finally, as shown in FIG. Fig.10As shown, the tab 131 of the battery cell 130 is bent again, so that the battery cell 130 is rotated relative to the connecting sheet 140 to a position where the side of the battery cell 130 provided with the tab 131 is opposite to the first side 1412 (or the second side 1415) of the tab connecting portion 141, so that the two battery cells 130 are arranged side by side on the same side of the connecting sheet 140. In this process, it is not necessary to bend the tab connecting portion 141 of the connecting sheet 140, which can avoid the problem that the tab connecting portion 141 of the connecting sheet 140 needs to be folded during the assembly process of the existing battery 100, which affects the strength of the battery 100, and is conducive to improving the performance and safety performance of the battery 100.

[0063] Among them, Figure 3 As shown, a gap 1417 can be provided between the two tab connection portions 141 of the connection sheet 140, and the first edge 1416 of the first bent plate 1413 is located on a side of the first bent plate 1413 close to the gap 1417. Figure 5 As shown, the two first flat plate structures 200 distributed along the third direction Z can be separated by a split seam 220, and the mutually adjacent portions of the two first flat plate structures 200 are bent at a first folding line 210 extending along the second direction Y to form two tab connecting portions 141. Since the two first flat plate structures 200 only need to be separated by a relatively narrow split seam 220, less material needs to be removed between the two first bent plates 1413, and even no material needs to be removed, which is conducive to improving the material utilization rate of the connecting sheet 140.

[0064] Or, if Figure 6 As shown, the connecting piece 140 may also include two tab connecting portions 141, and the first edges 1416 of the two first bent plates 1413 are located on the side away from the two first bent plates 1413. Figure 7 As shown, the two first flat plate structures 200 distributed along the third direction Z can be separated by a dividing seam 220, and the parts of the two first flat plate structures 200 that are away from each other are bent at the first folding line 210 extending along the second direction Y to form two pole ear connecting portions 141, thereby improving the material utilization of the connecting sheet 140.

[0065] Among them, the two first flat plate structures 200 distributed in the third direction Z can also be connected as a whole without being separated by the dividing seam 220. After the two first flat plate structures 200 are bent at the first folding line 210 to form two pole ear connecting parts 141, the first connecting plates 1411 of the two pole ear connecting parts 141 are also connected as a whole.

[0066] Specifically, the shape of the first flat plate structure 200 can be made to be approximately rectangular. The opposite two side edges of the first flat plate structure 200 extend along the third direction Z. The other opposite two side edges of the first flat plate structure 200 extend along the second direction Y. After the first flat plate structure 200 is bent at the first folding line 210 to form the pole lug connection portion 141, the shapes of the first connecting plate 1411 and the first bent plate 1413 of the pole lug connection portion 141 are also approximately rectangular. By making the shape of the first flat plate structure 200 approximately rectangular, in the process of processing the flat plate to form the first flat plate structure 200, the material that needs to be removed between the multiple first flat plate structures 200 can be reduced, which is conducive to improving the material utilization rate of the flat plate.

[0067] In some embodiments, the width of the gap 1417 between the two tab connections 141 in the third direction Z can be greater than or equal to the sum of the widths of the first bent plates 1413 of the two tab connections 141 in the third direction Z, so that the gap 1417 between the two tab connections 141 can accommodate the two first bent plates 1413. When forming the two tab connections 141, a cutting seam extending along the second direction Y can be opened on the flat plate to form two first flat plate structures 200, and then the portions of the two first flat plate structures 200 close to each other can be bent, which has a relatively simple structure and is very convenient to process.

[0068] Among them, a relatively narrow cutting slit can be directly cut by a cutting tool on the flat plate forming the two tab connecting parts 141 to form two first flat plate structures 200 that are relatively close to each other. At this time, the width of the gap 1417 between the two tab connecting parts 141 in the third direction Z is substantially equal to the sum of the widths of the first bent plates 1413 of the two tab connecting parts 141 in the third direction Z.

[0069] Alternatively, a portion of the flat plate forming the two tab connecting portions 141 may be cut off by a cutting tool to form a wider cutting seam, so as to form two first flat plate structures 200 that are relatively far apart. At this time, the width of the gap 1417 between the two tab connecting portions 141 in the third direction Z is greater than the sum of the widths of the first bent plates 1413 of the two tab connecting portions 141 in the third direction Z.

[0070] In some embodiments, Figure 4 As shown, the distance between the second side 1415 of the first bent plate 1413 of the pole tab connection portion 141 and the first side 1412 of the first connecting plate 1411 is H1, and the ratio of H1 to the thickness of the first connecting plate 1411 or the thickness of the second connecting plate 1421 is T, wherein 2≤T≤2.5 can be made to ensure that the pole tab connection portion 141 has sufficient thickness.

[0071] In some embodiments, the distance between the second side 1415 of the first bent plate 1413 of the tab connection portion 141 and the first side 1412 of the first connecting plate 1411 is H1, wherein H1 can be ≥ 0.8 mm. Thus, the tab connection portion 141 can have a sufficient thickness to improve the connection stability between the tab connection portion 141 and the tab 131 of the battery cell 130. Among them, H1 can be 0.9 mm, 1 mm, 1.1 mm, etc., which can be specifically determined according to parameters such as the material of the tab connection portion 141 and welding power.

[0072] In some embodiments, the thickness of the first connecting plate 1411 can be greater than or equal to 0.4 mm; and / or the thickness of the first bending plate 1413 can be greater than or equal to 0.4 mm, so that the tab connection portion 141 formed by the stacking of the first connecting plate 1411 and the first bending plate 1413 has sufficient thickness. Among them, the thickness of the first connecting plate 1411 and the thickness of the first bending plate 1413 can be the same or different. Of course, the former can make the processing technology of the first flat plate structure 200 simpler, which is conducive to improving the processing efficiency of the connecting sheet 140 and reducing the processing cost of the connecting sheet 140. The thickness of the first connecting plate 1411 and / or the thickness of the first bending plate 1413 can be 0.5 mm, 0.7 mm, 0.9 mm, etc., which can be determined according to the thickness requirements of the tab connection portion 141.

[0073] In addition, the thickness of the first connecting plate 1411 can be less than or equal to 1.2 mm; and / or the thickness of the first bent plate 1413 can be less than or equal to 1.2 mm, so as to avoid the excessive thickness of the tab connection portion 141 formed by the stacking of the first connecting plate 1411 and the first bent plate 1413, which results in a larger overall thickness of the connecting sheet 140 and further affects the overall size of the battery 100. The thickness of the first connecting plate 1411 and / or the thickness of the first bent plate 1413 can be 0.6 mm, 0.8 mm, 1.1 mm, etc., which can be determined according to the thickness requirement of the tab connection portion 141.

[0074] In some embodiments, the width of the second side surface 1415 of the first bent plate 1413 in the third direction Z can be greater than or equal to 5 mm, and the first direction X and the second direction Y are respectively set at an angle with the third direction Z, so that the second side surface 1415 of the first bent plate 1413 has a sufficient area for connecting the tab 131 of the battery cell 130. The width of the second side surface 1415 of the first bent plate 1413 in the third direction Z can be 6 mm, 8 mm, 9 mm, etc., which can be determined according to the size of the tab 131 or other parameters.

[0075] In addition, the width of the first side surface 1412 of the first connecting plate 1411 in the third direction Z can be greater than or equal to 5 mm, and the first direction X and the second direction Y are respectively set at an angle with the third direction Z, so that the first side surface 1412 of the first connecting plate 1411 has a sufficient area for connecting the tab 131 of the battery cell 130. The width of the first side surface 1412 of the first connecting plate 1411 in the third direction Z can be 6 mm, 8 mm, 9 mm, etc., which can be determined according to the size of the tab 131 or other parameters.

[0076] It should be noted that the second side surface 1415 of the first bending plate 1413 and the first side surface 1412 of the first connecting plate 1411 can meet the above-mentioned size requirements at the same time, or only one of the second side surface 1415 of the first bending plate 1413 and the first side surface 1412 of the first connecting plate 1411 can meet the above-mentioned size requirements, which can be determined according to the connection method between the pole ear connecting part 141 and the pole ear 131 of the battery cell 130.

[0077] In some embodiments, the length of the first connecting plate 1411 and / or the first bent plate 1413 of the tab connector 141 is greater than or equal to 20 mm, so that the connecting piece 140 has sufficient length to connect the pole 120 with the tab 131 of the battery cell 130. The lengths of the first connecting plate 1411 and the first bent plate 1413 may be 23 mm, 25 mm, 26 mm, 28 mm, etc., depending on the distance between the pole 120 and the tab 131 of the battery cell 130.

[0078] In some embodiments, Figure 2 , Figure 4 and Figure 5 As shown, the pole connection portion 142 includes a second connection plate 1421 and a second bent plate 1425, the second bent plate 1425 and the second connection plate 1421 are stacked along the first direction X, one end of the second connection plate 1421 along the second direction Y is connected to one end of the first connection plate 1411 along the second direction Y, and the second connection plate 1421 is used to connect to the pole 120. By stacking the second bent plate 1425 and the second connection plate 1421 along the first direction X, the thickness and structural strength of the pole connection portion 142 can be increased, thereby improving the connection stability between the pole connection portion 142 and the pole 120.

[0079] Moreover, by making the pole connecting portion 142 of the connecting piece 140 include a second connecting plate 1421 and a second bent plate 1425 connected as one body, the second flat plate structure 300 can be folded at the second folding line 310 to form the second connecting plate 1421 and the second bent plate 1425 of the pole connecting portion 142. While improving the structural strength of the pole connecting portion 142, the connecting piece 140 can maintain a single-layer plate structure in areas where the strength or thickness requirements are not high, thereby further saving the material of the connecting piece 140, reducing the cost and weight of the connecting piece 140, and further reducing the cost and weight of the battery 100.

[0080] The second bent plate 1425 of the pole connection portion 142 includes a second edge 1426 for connecting to the second connecting plate 1421, that is, the second bent plate 1425 of the pole connection portion 142 is integrally connected to the second connecting plate 1421 at the second edge 1426. The pole connection portion 142 can be formed by folding the second flat plate structure 300 along the second folding line 310 to form a stacked second bent plate 1425 and a second connecting plate 1421, and the second folding line 310 is located at the second edge 1426.

[0081] In some embodiments, the second edge 1426 of the second bent plate 1425 may be located on one side of the second bent plate 1425 along the third direction Z. Thus, a portion of the second flat plate structure 300 for forming the pole connecting portion 142 along one side of the third direction Z may be folded to form the second connecting plate 1421 and the second bent plate 1425 .

[0082] The second edge 1426 of the second bent plate 1425 extends along the second direction Y, so as to facilitate folding the second flat plate structure 300 at the second folding line 310. Moreover, the shape of the second flat plate structure 300 can be as close to a rectangle as possible. When the first edge 1416 of the first bent plate 1413 is also located on one side of the first bent plate 1413 along the third direction Z, the first folding line 210 of the first flat plate structure 200 and the second folding line 310 of the second flat plate structure 300 extend in the same direction, so that the shape of the plate-like structure formed by splicing the first flat plate structure 200 and the second flat plate structure 300 can be as close to a rectangle as possible, so that less waste is generated when the plate is processed to form the plate-like structure, so as to improve the utilization rate of the plate.

[0083] Of course, the second edge 1426 of the second bent plate 1425 can also be located on the side of the second bent plate 1425 away from the tab connection portion 141 along the second connecting plate 1421 along the second direction Y. The second edge 1426 of the second bent plate 1425 can be extended along the third direction Z, that is, the second folding line 310 of the second flat plate structure 300 extends along the third direction Z, so as to facilitate folding the second flat plate structure 300 at the second folding line 310.

[0084] In some embodiments, Figure 3 As shown, the second connecting plate 1421 includes a connecting portion 1422 for connecting to the pole 120. The pole connecting portion 142 includes two second bent plates 1425, and the two second bent plates 1425 are distributed on both sides of the connecting portion 1422 along the third direction Z. Thus, the structural strength of the pole connecting portion 142 can be further improved, so that the pole connecting portion 142 can be more stably connected to the pole 120.

[0085] The second flat plate structure 300 can be folded at two parallel second folding lines 310 to form a second connecting plate 1421 and two second bent plates 1425 integrally connected to the second connecting plate 1421 on both sides along the third direction Z. The portion of the second connecting plate 1421 between the two second bent plates 1425 is a connecting portion 1422 for connecting to the pole 120.

[0086] In some embodiments, the connecting portion 1422 of the second connecting plate 1421 is provided with a through hole 1423, which penetrates the connecting portion 1422 along the first direction X, and the through hole 1423 is used for the pole 120 to be inserted, so that the connecting portion 1422 is connected to the pole 120. The pole 120 and the connecting portion 1422 can be welded and connected by welding.

[0087] In the embodiment of the present application, the first bent plate 1413 of the tab connection portion 141 and the second bent plate 1425 of the pole connection portion 142 can be located on the same side of the connecting piece 140, or the first bent plate 1413 of the tab connection portion 141 and the second bent plate 1425 of the pole connection portion 142 can be distributed on both sides of the connecting piece 140. Of course, the former can make the overall thickness of the connecting piece 140 in the first direction X smaller, which is conducive to further reducing the size of the battery 100.

[0088] In some embodiments, Figure 4As shown, the second connecting plate 1421 has a third side surface 1424 on the side away from the second bending plate 1425, and the second bending plate 1425 has a fourth side surface 1427 on the side away from the second connecting plate 1421. The distance between the third side surface 1424 and the fourth side surface 1427 is H2, wherein H2≥0.8mm. Thus, the pole connecting portion 142 can have a sufficient thickness to improve the connection stability between the pole connecting portion 142 and the pole 120. Among them, H2 can be 0.9mm, 1mm, 1.1mm, etc., which can be determined according to parameters such as the material of the pole connecting portion 142 and welding power.

[0089] In some embodiments, the thickness of the second connecting plate 1421 can be greater than or equal to 0.4 mm; and / or the thickness of the second bent plate 1425 can be greater than or equal to 0.4 mm, so that the pole connecting portion 142 formed by the stacking of the second connecting plate 1421 and the second bent plate 1425 has sufficient thickness. Among them, the thickness of the second connecting plate 1421 and the thickness of the second bent plate 1425 can be the same or different. Of course, the former can make the processing technology of the second flat plate structure 300 simpler, which is conducive to improving the processing efficiency of the connecting plate 140 and reducing the processing cost of the connecting plate 140. The thickness of the second connecting plate 1421 and / or the thickness of the second bent plate 1425 can be 0.5 mm, 0.7 mm, 0.9 mm, etc., which can be determined according to the thickness requirements of the pole connecting portion 142.

[0090] In addition, the thickness of the second connecting plate 1421 can be less than or equal to 1.2 mm; and / or the thickness of the second bent plate 1425 can be less than or equal to 1.2 mm, so as to avoid the pole connecting portion 142 formed by the stacked arrangement of the second connecting plate 1421 and the second bent plate 1425 being too thick, resulting in a larger overall thickness of the connecting sheet 140, thereby affecting the overall size of the battery 100. The thickness of the second connecting plate 1421 and / or the thickness of the second bent plate 1425 can be 0.6 mm, 0.8 mm, 1.1 mm, etc., which can be determined according to the thickness requirements of the pole connecting portion 142.

[0091] In some embodiments, Figure 3 As shown, the connecting piece 140 may further include a fuse portion 143 connected between the pole connecting portion 142 and the pole ear connecting portion 141, and the fuse portion 143 is provided with a fuse slot 1431 extending along the third direction Z, and the first direction X and the second direction Y are respectively arranged at an angle with the third direction Z. Therefore, when the current of the connecting piece 140 is large, resulting in a rapid increase in temperature, the fuse portion 143 of the connecting piece 140 can be fused in time, thereby playing a role in safety protection.

[0092] Specifically, Figure 3 and Figure 5As shown, the second flat plate structure 300 and the plurality of first flat plate structures 200 are generally rectangular in shape. The first folding line 210 of the first flat plate structure 200 and the second folding line 310 of the second flat plate structure 300 both extend along the second direction Y, so that the first connecting plate 1411 and the first bending plate 1413 formed by folding the first flat plate structure 200 from the first folding line 210 are generally rectangular in shape, and the second connecting plate 1421 and the second bending plate 1425 formed by folding the second flat plate structure 300 from the second folding line 310 are also generally rectangular in shape.

[0093] Among them, the second connection plate 1421 of the pole connection part 142 is connected to the first connection plate 1411 of the plurality of pole lug connection parts 141 through the fuse part 143. The shape of the fuse part 143 is generally rectangular. The fuse slot 1431 of the fuse part 143 is a strip slot extending along the third direction Z, and the fuse slot 1431 penetrates the fuse part 143 along the first direction X. By making the shape of the fuse part 143, the second flat plate structure 300 and the plurality of first flat plate structures 200 generally rectangular, the shape of the plate-like structure formed by the combination of the fuse part 143, the second flat plate structure 300 and the plurality of first flat plate structures 200 can be close to a rectangle. When a plurality of such plate structures are formed by cutting or stamping a plate, waste between the plate structures can be reduced, the utilization rate of the plate can be improved, and the cost of the connecting piece 140 can be reduced.

[0094] An embodiment of the present application also provides a battery, which includes a connecting plate. The specific structure of the connecting plate refers to the above embodiment. Since the battery adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0095] Among them, Figure 1 and Figure 2 As shown, the battery 100 includes a shell, a battery cell 130 and a connecting piece 140. The shell (not shown in the figure) includes a top cover 110, and the top cover 110 is provided with a pole 120. The battery cell 130 is arranged in the shell, and the battery cell 130 includes a pole ear 131. The connecting piece 140 can be the connecting piece 140 in any of the above embodiments, and the connecting piece 140 is located between the battery cell 130 and the top cover 110. The first side 1412 of the first connecting plate 1411 of the connecting piece 140 or the second side 1415 of the first bending plate 1413 is connected to the pole ear 131.

[0096] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A connecting sheet, characterized in that: include: A pole connecting portion, used for connecting to a pole; At least one pole lug connection portion, the pole lug connection portion comprising a first connecting plate and a first bent plate connected in one piece, the first connecting plate and the first bent plate being stacked, and one end of the first connecting plate being connected to the pole connection portion; The first connecting plate has a first side surface on a side facing away from the first bending plate, and the first bending plate has a second side surface on a side facing away from the first connecting plate. The first side surface or the second side surface is used for connecting with the pole lug.

2. The connecting piece according to claim 1, characterized in that: The connecting piece includes two tab connecting portions.

3. The connecting piece according to claim 2, characterized in that: The two tab connection portions are sequentially distributed along the third direction, the first bent plate comprises a first edge for connecting with the first connection plate, and the first edge is located at one side of the first bent plate along the third direction; There is a gap between the two tab connecting portions, and the first edge is located on a side of the first bent plate close to the gap; or, Wherein, the first edges of the two first bent plates are located on a side of the two first bent plates away from each other.

4. The connecting piece according to claim 3, characterized in that: The first connecting plate and the first bending plate are stacked along the first direction, one end of the first connecting plate along the second direction is connected to the pole connecting part, and the first direction, the second direction and the third direction are arranged at an angle to each other; the width of the gap in the third direction is greater than or equal to the sum of the widths of the two first bending plates in the third direction.

5. The connecting sheet according to claim 1, characterized in that: A distance between the first side surface and the second side surface is H1, where H1≥0.8 mm.

6. The connecting sheet according to claim 1, characterized in that: The thickness of the first connecting plate is greater than or equal to 0.4 mm; the thickness of the first connecting plate is less than or equal to 1.2 mm; and / or, The thickness of the first bent plate is greater than or equal to 0.4 mm; the thickness of the first bent plate is less than or equal to 1.2 mm.

7. The connecting sheet according to claim 1, characterized in that: The distance between the first side surface and the second side surface is H1, wherein the ratio of H1 to the thickness of the first connecting plate or the thickness of the first bent plate is T, and 2≤T≤2.

5.

8. The connecting sheet according to claim 1, characterized in that: The first connecting plate and the first bending plate are stacked along a first direction, and one end of the first connecting plate along a second direction is connected to the pole connecting portion; wherein, The width of the first side surface in the third direction is greater than or equal to 5 mm, and the first direction and the second direction are respectively arranged at an angle with the third direction; and / or, The width of the second side surface in the third direction is greater than or equal to 5 mm, and the first direction and the second direction are respectively arranged at an angle with the third direction.

9. The connecting piece according to any one of claims 1 to 8, characterized in that: The pole connecting portion includes a second connecting plate and a second bent plate, the second bent plate and the second connecting plate are stacked along a first direction, one end of the second connecting plate along a second direction is connected to one end of the first connecting plate along the second direction, and the second connecting plate is used to be connected to the pole.

10. The connecting sheet according to claim 9, characterized in that: The second bending plate includes a second edge for connecting to the second connecting plate, the second edge is located on one side of the second bending plate along a third direction, and the first direction and the second direction are respectively arranged at an angle with the third direction.

11. The connecting sheet according to claim 10, characterized in that: The second connecting plate includes a connecting portion for connecting to a pole; the pole connecting portion includes two second bent plates, and the two second bent plates are distributed on both sides of the connecting portion along the third direction.

12. The connecting sheet according to claim 9, characterized in that: The first bent plate and the second bent plate are located on the same side of the connecting piece.

13. A battery, characterized in that: include: The housing comprises a top cover, wherein the top cover is provided with a pole; A battery cell is disposed in the housing, and the battery cell includes a tab; A connecting piece, wherein the connecting piece is the connecting piece according to any one of claims 1 to 12, the connecting piece is located between the battery cell and the top cover, and the first side surface of the first connecting plate or the second side surface of the first bent plate of the connecting piece is connected to the pole ear.

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