Connecting piece and battery

Abstract

The present application relates to the field of battery technology, and in particular to a connecting piece and a battery, wherein the connecting piece includes multiple layers of foil, which are stacked along a first direction to form a connecting body, and the connecting body includes a first connecting area, a bending area, and a second connecting area, wherein the bending area is arranged between the first connecting area and the second connecting area. The first connecting area is provided with a welding area for connecting to the pole, and a welding mark for welding the multiple layers of foil is provided in the welding area, and the second connecting area is used to connect to the pole lug. According to the connecting piece and battery provided in the present application, the connecting piece is easier to bend, which not only realizes the fixation between the multiple layers of foil but also can effectively improve the uniformity of the spacing distribution of the layers of foil in the welding area, thereby effectively avoiding the phenomenon of explosion points occurring during the welding process between the welding area and the pole due to the uneven spacing between the layers of the welding area formed by the multiple layers of foil.

Description

Technical Field

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

[0002] In existing battery technology, connecting plates are usually used to connect the poles on the top cover and the tabs on the pole group. Today's connecting plates are usually formed by continuous stamping of copper plates or aluminum plates. The hardness and strength of the connecting plates are relatively large, making it inconvenient to bend the connecting plates between the top cover and the pole group. In addition, the internal stress of the bent connecting plates is relatively large, which greatly affects the stability of the connecting plates connecting the poles and the pole group. Summary of the Invention

[0003] The purpose of the present application is to provide a connecting piece and a battery, which can, to a certain extent, solve the technical problem existing in the prior art that the current connecting piece is usually formed by continuous stamping of copper plates or aluminum plates. The hardness and strength of the connecting piece are relatively large, which makes it inconvenient to bend the connecting piece between the top cover and the electrode group. In addition, the internal stress of the bent connecting piece is relatively large, which greatly affects the stability of the connecting piece connecting both the electrode column and the electrode group.

[0004] According to a first aspect of the present application, a connecting sheet is provided, comprising a plurality of layers of foil, wherein the plurality of layers of foil are stacked along a first direction to form a connecting body, wherein the connecting body comprises a first connecting area, a bending area, and a second connecting area, wherein the bending area is arranged between the first connecting area and the second connecting area;

[0005] The first connection area is provided with a welding area for connecting to the pole, and a welding mark for welding the multi-layer foil is provided in the welding area. The second connection area is used for connecting to the tab.

[0006] Preferably, the first connection area includes one or more welding areas;

[0007] A plurality of welding marks are arranged in each welding area, and the welding marks are distributed throughout the welding area in an array form.

[0008] Preferably, the weld mark forms a pit on the surface of the connecting body;

[0009] The total size of the pits in the first direction accounts for 50% to 80% of the size of the connecting body in the first direction.

[0010] Preferably, the distance between two adjacent weld marks in the same weld zone is greater than the span of the weld marks in a direction perpendicular to the first direction.

[0011] Preferably, the distance between two adjacent weld marks is 0.4 mm to 1.0 mm;

[0012] The span of the weld mark perpendicular to the first direction is 0.2 mm to 0.8 mm.

[0013] Preferably, an indentation is formed on one side of the connecting body in the first direction and is recessed into the connecting body to form the bending area;

[0014] The first connecting area, the bending area and the second connecting area are arranged in sequence along the second direction;

[0015] The bending zone extends along a third direction, the third direction intersects the second direction, and the first direction is perpendicular to a plane defined by the second direction and the third direction.

[0016] Preferably, a dimension f of the indentation in the first direction is 0.15 mm to 0.25 mm;

[0017] A dimension e of the indentation in the second direction is 2 mm to 10 mm.

[0018] Preferably, the bending area is further provided with a hole penetrating the connecting body along the first direction;

[0019] The number of the holes is one or more;

[0020] When there are multiple holes, the multiple holes are spaced apart along the third direction.

[0021] Preferably, the tab is in contact with one side of the second connection region in the first direction;

[0022] Alternatively, at least a portion of the tab is sandwiched between the multiple layers of foil in the second connection area.

[0023] According to a second aspect of the present application, a battery is provided, comprising a connecting piece as described in any of the above technical solutions, and thus having all the beneficial technical effects of the connecting piece, which will not be described in detail here.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] The connecting piece provided by the present application is formed into a connecting body by stacking multiple layers of foil along a first direction, which can effectively reduce the hardness of the connecting piece and make the connecting piece easier to bend. A first connecting area, a bending area, and a second connecting area are provided on the connecting body, and the bending area is provided between the first connecting area and the second connecting area to realize the function of the connecting piece connecting the pole ear and the pole. A welding area for connecting to the pole is provided in the first connecting area, and a welding mark for welding the multiple layers of foil is provided in the welding area. This not only realizes the fixation between the multiple layers of foil but also effectively improves the uniformity of the spacing distribution of the layers of foil in the welding area, thereby effectively avoiding the phenomenon of explosion points occurring during the welding process between the welding area and the pole due to the uneven spacing of the layers of foil in the welding area formed by the multiple layers of foil.

[0026] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0028] Figure 1 A schematic diagram of the axonometric structure of the connecting piece provided in an embodiment of the present application;

[0029] Figure 2 A schematic front view of the structure of the connecting piece provided in an embodiment of the present application;

[0030] Figure 3 for Figure 2 The enlarged structural diagram of the connecting piece at position B is provided;

[0031] Figure 4 for Figure 2 A schematic diagram of the cross-section structure of the provided connecting piece obtained by cutting along AA;

[0032] Figure 5 for Figure 4 The enlarged structural diagram of the connecting piece at position C is provided;

[0033] Figure 6 for Figure 4 The enlarged structural diagram of the connecting piece at position D is provided;

[0034] Figure 7 A schematic diagram of the multi-layer foil stacking structure of the connecting sheet provided in an embodiment of the present application;

[0035] Figure 8 Another schematic diagram of the structure of the multi-layer foil stacked on the connecting sheet provided in an embodiment of the present application;

[0036] Figure 9 A schematic diagram of the explosion structure of a battery provided in an embodiment of the present application;

[0037] Figure 10 A schematic diagram of the exploded structure of the cover plate and the connecting piece provided in an embodiment of the present application;

[0038] Figure 11 This is a schematic diagram of the axonometric structure of the bent connecting piece provided in an embodiment of the present application;

[0039] Figure 12 A partially enlarged schematic diagram of the assembly structure of a battery provided in an embodiment of the present application;

[0040] Figure 13 This is another partially enlarged schematic diagram of the assembly structure of the battery provided in an embodiment of the present application;

[0041] Figure 14 Another partially enlarged schematic diagram of the assembly structure of the battery provided in an embodiment of the present application;

[0042] Figure 15 This is another schematic front view of the structure of the connecting piece provided in an embodiment of the present application;

[0043] Figure 16 This is another front view structural schematic diagram of the connecting piece provided in an embodiment of the present application.

[0044] Reference numerals:

[0045] 1-connecting piece; 11-first connecting area; 110-welding area; 111-welding mark; 12-second connecting area; 13-bending area; 131-hole; 2-pole group; 21-pole ear; 3-cover plate; 31-pole column; 311-base plate; 312-connecting block; 32-first insulating member; 4-second insulating member; 5-housing.

[0046] F1-first direction; F2-second direction; F3-third direction. DETAILED DESCRIPTION

[0047] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0048] The components of the embodiments of the present application generally described and shown in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the present application.

[0049] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0050] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0051] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0052] Refer to the following Figures 1 to 16 The invention describes a connecting sheet and a battery according to some embodiments of the present application.

[0053] See also Figures 1 to 16 As shown, an embodiment of the first aspect of the present application provides a connecting sheet. The connecting sheet 1 includes multiple layers of foil. The multiple layers of foil are stacked along a first direction F1 to form a connecting body. The connecting body includes a first connecting area 11, a bending area 13, and a second connecting area 12. The bending area 13 is arranged between the first connecting area 11 and the second connecting area 12. The first connecting area 11 is provided with a welding area 110 for connecting to the pole 31. The welding area 110 is provided with a welding mark 111 for welding the multiple layers of foil. The second connecting area 12 is used to connect to the tab 21.

[0054] According to the connecting piece provided by the above technical features, a connecting body is formed by stacking multiple layers of foil along a first direction F1, which can effectively reduce the hardness of the connecting piece 1, making the connecting piece 1 easier to bend. A first connecting area 11, a bending area 13, and a second connecting area 12 are provided on the connecting body, and the bending area 13 is provided between the first connecting area 11 and the second connecting area 12 to realize the function of the connecting piece 1 connecting the tab 21 and the pole 31. At the same time, a welding area 110 for connecting to the pole 31 is provided in the first connecting area 11, and a welding mark 111 for welding the multiple layers of foil is provided in the welding area 110. This not only achieves the fixation between the multiple layers of foil but also effectively improves the uniformity of the spacing distribution of the layers of foil in the welding area 110, thereby effectively avoiding the phenomenon of explosion points occurring during the welding process between the welding area 110 and the pole 31 due to the uneven spacing between the layers of the welding area 110 formed by the multiple layers of foil.

[0055] like Figures 1 to 3 As shown, F1 shown in the figure may be an example of the first direction F1, F2 shown in the figure may be an example of the second direction F2 described below, and F3 shown in the figure may be an example of the third direction F3 described below. When the connecting piece 1 is in an unbent state, the second direction F2 and the third direction F3 may be intersecting, and the first direction F1 may intersect a plane defined by the second direction F2 and the third direction F3. Preferably, any two of the first direction F1, the second direction F2, and the third direction F3 are perpendicular to each other.

[0056] like Figure 1 、 Figure 2 and Figure 10 As shown in the figure, the first connection area 11 is shown as an example in which two welding areas 110 are included, so as to be applicable to a pole 31 having two bottom plates 311. However, the present invention is not limited thereto, and the number of welding areas 110 provided in the first connection area 11 can be adaptively adjusted according to the structure of the pole 31. For example, the number of welding areas 110 provided in the first connection area 11 can also be one, three, four, or more.

[0057] Preferably, if Figures 1 to 4 As shown, a plurality of weld marks 111 may be provided in each welding area 110 to further improve the fixing stability between the multiple layers of foil and the uniformity of the spacing distribution between the layers of foil in the welding area 110 .

[0058] Preferably, if Figures 1 to 4As described above, the plurality of weld marks 111 in the welding area 110 are distributed throughout the welding area 110 in an array to further improve the uniformity of the spacing distribution between the layers of foil in the welding area 110. It should be noted that the distribution of the weld marks 111 in the welding area 110 is not limited to the array as long as the weld marks 111 can be fully distributed throughout the welding area 110.

[0059] Preferably, if Figure 4 As shown, the welding mark 111 may form a recess on the surface of the connection body.

[0060] Optionally, the weld mark 111 may be formed by laser ultrasonic welding.

[0061] Preferably, if Figure 4 As shown, the welding mark 111 may form pits at relative positions on both sides of the connecting body in the first direction F1 to further improve the fixing stability of the welding mark 111 to the multi-layer foil.

[0062] Preferably, the sum of the sizes of the pits in the first direction F1 accounts for 50% to 80% of the size of the connecting body in the first direction F1. It should be noted that, taking the connecting piece welded on the connecting body in the first direction F1 as an example, the sum of the sizes of the pits in the first direction F1 can be understood as the sum of the sizes of the two pits arranged opposite to each other on both sides of the connecting body in the first direction F1. That is to say, Figure 4 As shown in the figure, the sum of the dimensions of the pits in the first direction F1 accounts for 50% to 80% of the dimension of the connecting body in the first direction F1, which can be understood as 50%T≤(t1+t2)≤80%T; and for a connecting piece in which the weld mark is only provided on one side of the connecting body in the first direction F1 (not shown in the figure), the dimension of the pit of the connecting piece in the first direction F1 accounts for 50% to 80% of the dimension of the connecting body in the first direction F1.

[0063] Referring to Table 1, there are shown multiple embodiments of different weld marks 111 sizes, in which opposite tensile forces are applied to both sides of the welding area 110 in the first direction F1. It should be noted that when the tensile force applied to both sides of the welding area 110 in the first direction F1 exceeds 50N, the welding area 110 is considered qualified if it can still ensure that there is no delamination.

[0064] The data from Examples 1 to 16 in Table 1 show that when the sum of the dimensions of the dimples in the first direction F1 is within 50% to 80% of the dimension of the connector body in the first direction F1, the weld marks 111 of the multi-layer foil can withstand tensile forces exceeding 50 N without delamination, effectively ensuring the connection strength between the foil layers and thereby improving the connection stability of the foil layers of the connector body. The data from Examples 17 to 32 in Table 1 show that when the sum of the dimensions of the dimples in the first direction F1 is not within 50% to 80% of the dimension of the connector body in the first direction F1, the weld marks 111 of the multi-layer foil cannot withstand tensile forces exceeding 50 N without delamination.

[0065] Table 1:

[0066]

[0067] It should be noted that, taking the example in which the above-mentioned pits are formed at relative positions on both sides of the connecting body in the first direction F1, the sum of the sizes of the above-mentioned pits in the first direction F1 can be understood as the sum of the sizes of the two pits at relative positions on both sides of the connecting body in the first direction F1.

[0068] Preferably, the distance between two adjacent weld marks 111 in the same welding area 110 is greater than the span of the weld marks 111 in a direction perpendicular to the first direction F1 , so as to facilitate the manufacture of the welding area 110 .

[0069] Preferably, the distance between two adjacent weld marks 111 may be 0.4 mm to 1.0 mm. It should be noted that the distance between two adjacent weld marks 111 here may refer to the row spacing between adjacent rows of weld marks 111 distributed in an array (ie, Figure 3 L1 shown), the distance between two adjacent weld marks 111 here can also refer to the column spacing between adjacent columns in the weld marks 111 distributed in the array (ie, Figure 3 L2 shown), in other words, 0.4mm≤L1≤1.0mm, 0.4mm≤L2≤1.0mm.

[0070] Preferably, the span of the weld mark 111 in a direction perpendicular to the first direction F1 may be 0.2 mm to 0.8 mm.

[0071] Referring to Tables 1 and 2, the data from Examples 1 to 16 in Table 1 show that when the distance between two adjacent weld marks 111 falls within the range of 0.4 mm to 1.0 mm and the span of the weld marks 111 perpendicular to the first direction F1 falls within the range of 0.2 mm to 0.8 mm, the weld marks 111 of the multi-layer foil can withstand tensile forces exceeding 50 N without delamination, effectively ensuring the connection strength between the layers of foil and thereby improving the connection stability of the layers of the connecting body. The data from Examples 33 to 48 in Table 2 show that even if the ratio h / H of the weld mark 111 depth to the connecting sheet thickness falls within the aforementioned range of 50% to 80%, if the distance between two adjacent weld marks 111 does not fall within the range of 0.4 mm to 1.0 mm or the span of the weld marks 111 perpendicular to the first direction F1 does not fall within the range of 0.2 mm to 0.8 mm, the weld marks 111 of the multi-layer foil still cannot withstand tensile forces exceeding 50 N without delamination.

[0072] Table 2:

[0073]

[0074] Preferably, Figure 3 Taking the example of the above-mentioned pit being a square pit as an example, the span of the above-mentioned welding mark 111 in the direction perpendicular to the first direction F1 can be understood as the side length of the square pit (i.e. Figure 3 S1 and S2 shown).

[0075] Optionally, not shown in the figure, the above-mentioned pit can also be a circular pit (such as Figure 15 As shown), correspondingly, the span of the above-mentioned weld mark in the direction perpendicular to the first direction F1 can be understood as the diameter of the circular pit.

[0076] However, the shape of the above-mentioned pit is not limited to the above-mentioned square pit and circular pit, and can also be a triangular pit (such as Figure 16 as shown), five-pointed star-shaped pits or other regular / irregular shaped pits.

[0077] Optionally, the foil material may be aluminum foil, copper foil, etc.

[0078] Optionally, the thickness of the foil in the first direction F1 may be 0.1 mm, 0.2 mm, or 0.3 mm.

[0079] In an embodiment, preferably, Figures 6 to 8 As shown in the figure, an example of forming a connection body by stacking multiple layers of foil in three different ways along a first direction F1 is shown.

[0080] Example 1, such as Figure 6As shown in the figure, an example is shown in which the connection body is formed by stacking multiple U-shaped foil groups, wherein the U-shaped foil group is formed by stacking multiple layers of foil and folding them along the center line. Figure 6 An example is shown in which the U-shaped foil group includes two layers of foil and the connecting body includes two U-shaped foil groups. However, this is not limited to this. The number of foil layers and the number of U-shaped foil groups can be adaptively adjusted according to the size of the connecting body in the first direction F1 and the size of the foil in the first direction F1.

[0081] Example 2, such as Figure 7 As shown in the figure, an example is shown in which a base material is formed by stacking multiple layers of foil materials, and the base material is wound back and forth in a serpentine manner to form a connection body. Figure 7 An example is shown in which the substrate includes two layers of foil, but this is not limited thereto. The number of foil layers and the number of reciprocating paths of the substrate can be adaptively adjusted according to the size of the connecting body in the first direction F1 and the size of the foil in the first direction F1.

[0082] Example 3, such as Figure 8 As shown in the figure, an example of a connection body formed by simply stacking multiple layers of foils is shown. It should be noted that as long as the multi-layer foil structure of the connection body can be achieved, the stacking method of the above foils is not limited to the above form.

[0083] In an embodiment, Figures 1 to 4 As shown, an indentation is formed on one side of the connecting body in the first direction F1, recessed into the connecting body, to form a bending region 13. The first connecting region 11, the bending region 13, and the second connecting region 12 are sequentially arranged along the second direction F2. The bending region 13 extends along the third direction F3. This indentation, on the one hand, further improves the connection stability between the various layers of foil. On the other hand, the indentation-formed bending region 13 allows for pre-bending and shaping of the bending region 13, further facilitating the bending and forming of the connecting body.

[0084] Preferably, if Figure 5 As shown, the size of the indentation in the first direction F1 (i.e., the f value shown in the figure) can be 0.15mm~0.25mm. For example, the size of the indentation in the first direction F1 can be 2mm, so as to facilitate the bending of the first connecting area 11 and the second connecting area 12 along the bending area 13, so that the connecting piece 1 is formed as shown in the figure by bending. Figure 11 The connecting piece 1 is shown in a bent state.

[0085] Preferably, if Figure 1 and Figure 4 As shown, the size of the indentation in the second direction F2 (ie, the value e shown in the figure) can be 2 mm to 10 mm to adapt to the installation space of the connecting piece 1.

[0086] Preferably, if Figure 1 、 Figure 2 、 Figure 10 and Figure 11 As shown, the above-mentioned bending zone 13 can also be provided with a hole 131 passing through the connecting body along the first direction F1. In this way, on the one hand, the hole 131 can effectively improve the bending sensitivity of the bending zone 13 to facilitate the bending operation of the connecting piece 1; on the other hand, the hole 131 can effectively release the internal stress generated between the layers of foil during the bending process to improve the stability of the bending zone 13.

[0087] like Figure 1 、 Figure 2 、 Figure 10 and Figure 11 As shown in the figure, an example is shown in which the number of the above-mentioned holes 131 is two, and the two holes 131 are arranged at intervals along the third direction F3 to ensure that the holes 131 release the internal stress of the bending area 13 uniformly.

[0088] However, it is not limited thereto, and the number of holes 131 may be adaptively adjusted according to the size of the connecting piece 1 in the third direction F3 and the designed flow capacity of the connecting piece 1. For example, the number of holes 131 may be 1, 3, 4 or more.

[0089] In an embodiment, Figures 12 to 14 As shown, two different connection modes of the tab 21 and the second connection area 12 are shown in the figure.

[0090] Optionally, method 1, such as Figure 12 and Figure 14 As shown, the tab 21 may be in contact with one side of the second connection region 12 in the first direction F1 .

[0091] Preferably, the second method is as follows: Figure 13 As shown, at least a portion of the tab 21 is sandwiched between the multi-layer foil in the second connection area 12, which not only improves the connection stability between the tab 21 and the connecting piece 1, but also increases the connection area between the tab 21 and the connecting piece 1, thereby ensuring the flow capacity between the tab 21 and the connecting piece 1.

[0092] Optionally, not shown in the figures, the tab 21 and the second connection area 12 may be connected via laser ultrasonic welding to ensure the connection stability between the tab 21 and the connection sheet 1 .

[0093] See also Figures 9 to 14 The embodiment of the second aspect of the present application further provides a battery, comprising the connecting piece described in any of the above embodiments, and thus having all the beneficial technical effects of the connecting piece, which will not be repeated here.

[0094] Preferably, if Figure 9 As shown, the battery may further include a housing 5, an electrode group 2, and a cover plate 3. The housing 5 encloses a space for accommodating the electrode group 2, and the cover plate 3 is disposed at opposite ends of the housing 5. The cover plate 3 is provided with a terminal post 31, and the opposite ends of the electrode group 2 and the cover plate 3 are each provided with a tab 21. The tab 21 is electrically connected to the corresponding terminal post 31 on the cover plate 3 via the connecting piece 1.

[0095] like Figure 9 and Figure 10 As shown in the figure, an example is shown in which the pole 31 includes a connection block 312 and two bottom plates 311. The two bottom plates 311 pass through the cover plate 3 and are connected to the connection block 312. Correspondingly, the first connection area 11 of the connecting piece 1 can include two welding areas 110 for welding to the two bottom plates 311 respectively.

[0096] Alternatively, as Figures 12 to 14 As shown, the battery may further include a first insulating member 32 . The first insulating member 32 may be disposed between the connecting block 312 and the cover plate 3 to achieve insulation between the connecting block 312 and the cover plate 3 .

[0097] Alternatively, as Figure 9 、 Figure 10 、 Figures 12 to 14 As shown, the battery may further include a second insulating member 4 , which may be provided on a side of the cover plate 3 facing the electrode group 2 to achieve insulation between the cover plate 3 and the electrode group 2 .

[0098] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A connecting piece, characterized in that: The connecting sheet (1) comprises a multilayer foil material, wherein the multilayer foil material is stacked along a first direction (F1) to form a connecting body, wherein the connecting body comprises a first connecting area (11), a bending area (13) and a second connecting area (12), wherein the bending area (13) is arranged between the first connecting area (11) and the second connecting area (12); The first connection area (11) is provided with a welding area (110) for connecting to the pole (31), and a welding mark (111) for welding the multi-layer foil is provided in the welding area (110); the second connection area (12) is used for connecting to the pole tab (21); The first connection area (11) includes one or more welding areas (110); A plurality of welding marks (111) are provided in each welding area (110), and the plurality of welding marks (111) are distributed in the welding area (110) in an array form; The welding mark (111) forms a pit on the surface of the connecting body; The weld mark (111) is formed by laser ultrasonic welding; The sum of the dimensions of the recess in the first direction (F1) accounts for 50% to 80% of the dimension of the connecting body in the first direction (F1); The distance between two adjacent weld marks (111) in the same weld zone (110) is greater than the span of the weld mark (111) in a direction perpendicular to the first direction (F1); The distance L1 between two adjacent welding marks (111) is 0.4 mm to 1.0 mm; The span of the weld mark (111) in a direction perpendicular to the first direction (F1) is 0.2 mm to 0.8 mm; The bending area (13) is further provided with a hole (131) penetrating the connecting body along the first direction (F1); The number of the holes (131) is one or more; When there are multiple holes (131), the multiple holes (131) are spaced apart along the third direction (F3); An indentation is formed on one side of the connecting body in the first direction (F1) and is recessed into the connecting body to form the bending area (13); The first connecting area (11), the bending area (13) and the second connecting area (12) are arranged in sequence along the second direction (F2); The bending zone (13) extends along a third direction (F3), the third direction (F3) intersects the second direction (F2), and the first direction (F1) is perpendicular to a plane defined by the second direction (F2) and the third direction (F3).

2. The connecting piece according to claim 1, characterized in that The dimension f of the indentation in the first direction (F1) is 0.15 mm to 0.25 mm; A dimension e of the indentation in the second direction (F2) is 2 mm to 10 mm.

3. The connecting piece according to claim 1, characterized in that The tab (21) is in contact with one side of the second connection region (12) in the first direction (F1); Alternatively, at least a portion of the tab (21) is sandwiched between the multiple layers of foil in the second connection area (12).

4. A battery, characterized in that: The invention comprises the connecting piece (1) according to any one of claims 1 to 3.

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