Welded body, battery shell, battery and electric equipment

Abstract

The invention provides a welding body, a battery shell, a battery and electric equipment, and relates to the technical field of batteries, welding tracks are formed between a first component and a second component of the welding body, and the welding tracks comprise at least one first welding track extending in a curve mode and at least one second welding track extending in a straight line mode. The first welding track comprises a plurality of first welding spots, every two adjacent first welding spots are at least partially overlapped, and the overlapping ratio of every two adjacent first welding spots is a first overlapping ratio; the second welding track comprises a plurality of second welding spots, every two adjacent second welding spots are at least partially overlapped, and the overlapping rate of every two adjacent first welding spots is a second overlapping rate; the first overlapping ratio is different from the second overlapping ratio. The first component and the second component of the welding body are not prone to deformation and pseudo soldering, and the sealing performance is good.

Description

Technical Field

[0001] The present application relates to the field of welding technology, and in particular to a welding body, a battery housing, a battery and an electrical device. Background Art

[0002] A battery generally consists of a cell, a housing, and a cover. The housing has an opening to facilitate installation of the cell, and the cover fits over the opening to seal it. The cover can be connected to the housing by welding.

[0003] However, when the cover plate is welded to the shell in the above-mentioned related art, the shell is easily deformed, resulting in a cold weld, which in turn leads to poor sealing performance of the battery. Summary of the Invention

[0004] The embodiments of the present application provide a welding body, a battery shell, a battery and an electrical device, which are used to solve the technical problem in the above-mentioned related technologies that when the cover plate and the shell are welded, the shell is easily deformed, resulting in a cold weld, which in turn leads to poor sealing performance of the battery.

[0005] In order to achieve the above objectives, the embodiments of the present application provide the following technical solutions:

[0006] A first aspect of an embodiment of the present application provides a welded body, comprising a first component and a second component.

[0007] A welding track is formed at the joint between the first component and the second component;

[0008] The welding track includes at least one first welding track extending in a curve and at least one second welding track extending in a straight line, the first welding track includes a plurality of first welding spots, each adjacent two of the first welding spots at least partially overlap, and the overlap rate between the adjacent two of the first welding spots is a first overlap rate; the second welding track includes a plurality of second welding spots, each adjacent two of the second welding spots at least partially overlap, and the overlap rate between the adjacent two of the first welding spots is a second overlap rate;

[0009] The first overlap ratio and the second overlap ratio are different.

[0010] The embodiments of the present application provide a welded body, a battery shell, a battery and an electrical device, wherein a welding track is formed at the joint between the first component and the second component of the welded body, and the welding track includes at least one first welding track extending in a curve and at least one second welding track extending in a straight line, and the first overlap rate between two adjacent first welding points in the first welding track is different from the second overlap rate between two adjacent second welding points in the second welding track, so that during the welding process, different welding methods are adopted for different welding positions, avoiding the inability to adjust the corresponding welding method according to different welding positions during continuous welding. For example, when welding is performed at a position extending in a straight line on the joint between the first component and the second component of the welded body, the second welding track extending in a straight line can be used for welding, and when welding is performed at a position extending in a curve on the joint between the first component and the second component of the welded body, the first welding track extending in a curve can be used for welding, so that different positions on the welded body are fully adapted to their respective strengths, avoiding deformation of the welded body due to concentrated welding heat, and reducing the probability of cold welds at the welding positions on the welded body, thereby improving the welding sealing at the welding positions of the welded body and improving the sealing performance of the battery shell.

[0011] Based on the above technical solution, this application can also be improved as follows.

[0012] In a possible implementation, a plurality of the first welding spots are sequentially arranged with an equal overlap rate along a curved extension direction; and a plurality of the second welding spots are sequentially arranged with an equal overlap rate along a straight extension direction.

[0013] In a possible implementation manner, the first overlap ratio is greater than the second overlap ratio.

[0014] In a possible implementation, the first overlap ratio is greater than or equal to 30% and less than or equal to 85%;

[0015] And / or, the second overlap ratio is greater than or equal to 25% and less than or equal to 80%.

[0016] In a possible implementation, the first welding trajectory is a circular arc trajectory, and the radius of the circular arc trajectory is greater than or equal to 0.5 mm and less than or equal to 3 mm.

[0017] In one possible implementation, the welding trajectory is a closed trajectory, comprising a plurality of first welding trajectories extending in a curve and a plurality of second welding trajectories extending in a straight line, the directions of the extension straight lines of two adjacent second welding trajectories intersecting, and the first welding trajectory being located at a corner position defined by the two adjacent second welding trajectories.

[0018] In one possible implementation, a third welding track is formed between the adjacent first welding track and the second welding track, the third welding track includes a plurality of third welding spots, each two adjacent third welding spots at least partially overlap, and an overlap ratio between the two adjacent third welding spots is a third overlap ratio;

[0019] The third overlap ratio is different from the first overlap ratio, and the third overlap ratio is different from the second overlap ratio.

[0020] In a possible implementation manner, the third overlap ratio is greater than the first overlap ratio.

[0021] In a possible implementation, the third overlap ratio is greater than or equal to 35% and less than or equal to 95%.

[0022] In a possible implementation, the third welding track extends along a straight line.

[0023] In a possible implementation, along the arrangement direction of the third welding points, a size of the third welding track is greater than 0 mm and less than or equal to 2 mm.

[0024] In a possible implementation, the first welding track includes a curved portion extending in a curve and a straight portion extending in a straight line, the curved portion is connected to the straight portion, and the straight portion is connected to the third welding track.

[0025] In a possible implementation, the third welding track includes a first welding layer and a second welding layer. Along a first direction, the first welding layer covers at least a portion of the second welding layer.

[0026] In a possible implementation, the extension curve of the first welding trajectory is an independent arc or a combination of a straight line and an arc.

[0027] In one possible implementation, the extension curve of the first welding trajectory is a combination of a straight line and an arc, and the first welding trajectory includes a curved portion extending in a curve and a straight portion extending in a straight line, the extension curve of the curved portion is an independent arc, the curved portion is connected to the straight portion, and the straight portion is arranged between the curved portion and the third welding trajectory.

[0028] In one possible implementation,

[0029] The first welding spots at both ends of the first welding track are respectively overlapped and connected with the second welding spots on the adjacent second welding track close to the first welding track.

[0030] In one possible implementation, along the first direction, the area of ​​the first weld point accounts for a percentage greater than or equal to 50% and less than or equal to 100% of the area of ​​a first reference circle determined by the outer contour of the first weld point, wherein the first reference circle is a circle determined based on the outer contour of the positive projection of the first weld point along the first direction.

[0031] In one possible implementation, along the first direction, the area of ​​the second weld point accounts for a percentage greater than or equal to 50% and less than or equal to 100% of the area of ​​a second reference circle determined by the outer contour of the second weld point, wherein the second reference circle is a circle determined based on the outer contour of the positive projection of the second weld point along the first direction.

[0032] and / or a diameter of a first reference circle is greater than or equal to 0.1 mm and less than or equal to 0.3 mm, wherein the first reference circle is a circle determined according to an outer contour of an orthographic projection of the second welding point in the first direction;

[0033] And / or, the diameter of the second reference circle is greater than or equal to 0.1 mm and less than or equal to 0.3 mm, wherein the second reference circle is a circle determined according to the outer contour of the positive projection of the second welding point in the first direction

[0034] A second aspect of an embodiment of the present application provides a battery housing, which constitutes the welded body as described above, and includes a shell and a cover plate, the shell constituting the first component of the welded body, and the cover plate constituting the second component of the welded body.

[0035] In a possible implementation, the thickness of the shell is greater than or equal to 0.1 mm and less than or equal to 0.3 mm;

[0036] And / or, the thickness of the cover plate is greater than or equal to 0.03 mm and less than or equal to 0.1 mm.

[0037] In a possible implementation, the housing has two openings arranged opposite to each other;

[0038] There are two cover plates, each of which is disposed on one of the openings. A first welding track and a second welding track of the welding body are formed between each of the cover plates and the shell.

[0039] A third aspect of the embodiments of the present application provides a battery, comprising a battery cell and the battery housing as described above;

[0040] The battery core is arranged in the battery casing.

[0041] A fourth aspect of an embodiment of the present application provides an electrical device, which includes an electrical device and the battery as described above, wherein the battery is used to supply power to the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0043] Figure 1 A schematic structural diagram of a battery housing is provided for an embodiment of the present application;

[0044] Figure 2 An exploded diagram of a battery provided in an embodiment of the present application;

[0045] Figure 3 A first schematic diagram of a welding track formed between a battery housing and a cover plate provided in an embodiment of the present application;

[0046] Figure 4 A schematic diagram of two first welding points partially overlapping provided in an embodiment of the present application;

[0047] Figure 5 A schematic diagram of two second welding points partially overlapping provided in an embodiment of the present application;

[0048] Figure 6 A schematic diagram of a first welding track formed between a battery housing and a cover plate provided in an embodiment of the present application;

[0049] Figure 7 A schematic diagram of a welding track formed between a battery housing and a cover plate provided in an embodiment of the present application;

[0050] Figure 8 A schematic diagram of two third welding points partially overlapping provided in an embodiment of the present application;

[0051] Figure 9 A schematic diagram of a welding track formed between a battery housing and a cover plate provided in an embodiment of the present application;

[0052] Figure 10 A partial cross-sectional view of a battery housing provided in an embodiment of the present application;

[0053] Figure 11 A partial cross-sectional view of another battery housing provided in an embodiment of the present application;

[0054] Figure 12A schematic diagram of a second welding track formed between a battery housing and a cover plate provided in an embodiment of the present application.

[0055] Description of reference numerals:

[0056] 10-battery housing; 10a-welding body; 20-battery core;

[0057] 100-housing; 100a-first component;

[0058] 110- opening; 120- connecting portion;

[0059] 121- curved segment; 122- straight segment;

[0060] 200-cover plate; 200a-second component;

[0061] 210-first welding track; 220-second welding track; 230-third welding track;

[0062] 211 - first welding point; 212 - curved portion; 213 - straight portion;

[0063] 221 - second welding point; 231 - third welding point; 232 - first welding layer. DETAILED DESCRIPTION

[0064] As described in the background art, when the cover plate is welded to the shell in the related art, the shell is easily deformed, resulting in a cold weld, which in turn leads to poor sealing performance of the battery. The reason for this problem is that when the cover plate is welded to the shell in the related art, the same welding method is used for welding, and the welding trajectories at different positions on the connection part are the same. On the one hand, this leads to heat concentration. On the other hand, due to the different structural strengths at different positions on the shell, the same welding method cannot adapt to the structural strengths at different positions, which causes the weaker structural strength positions to be easily deformed by heat during the welding process, and further leads to a cold weld problem between the cover plate and the connection part caused by deformation, and causes the sealing between the cover plate and the connection part to cross, which in turn leads to poor sealing performance of the battery shell.

[0065] In response to the above technical problems, an embodiment of the present application provides a welding body, a battery shell, a battery and an electrical device, wherein a welding track is formed at the joint between the first component and the second component of the welding body, and the welding track includes at least one first welding track extending in a curve and at least one second welding track extending in a straight line, and the first overlap rate between each two adjacent first welding points in the first welding track is different from the second overlap rate between each two adjacent second welding points in the second welding track, so that during the welding process, different welding methods are adopted for different welding positions, avoiding the inability to adjust the corresponding welding method according to different welding positions during continuous welding. For example, when welding is performed at a position extending in a straight line on the welding body, the second welding track extending in a straight line can be used for welding, and when welding is performed at a position extending in a curve on the welding body, the first welding track extending in a curve can be used for welding, so that different positions on the welding body are fully adapted to their respective strengths, avoiding deformation of the welding body due to concentrated welding heat, and reducing the probability of cold welding at the welding position on the welding body, thereby improving the welding sealing at the welding position of the welding body and improving the sealing performance of the battery shell.

[0066] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings 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 ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0067] refer to Figure 1 、 Figure 2 and Figure 3 An embodiment of the present application provides a welded body 10a, comprising a first component 100a and a second component 200a. A welding track is formed at the joint between the first component 100a and the second component 200a. The welding track comprises at least one first welding track 210 extending in a curve and at least one second welding track 220 extending in a straight line. The first welding track 210 comprises a plurality of first welding spots 211, wherein each two adjacent first welding spots 211 at least partially overlap, and the overlap ratio of the two adjacent first welding spots 211 is a first overlap ratio. The second welding track 220 comprises a plurality of second welding spots 221, wherein each two adjacent second welding spots 221 at least partially overlap, and the overlap ratio of the two adjacent first welding spots 211 is a second overlap ratio. The first overlap ratio and the second overlap ratio are different.

[0068] In some embodiments, the joint between the first component 100a and the second component 200a can have a straight segment 122 extending in a straight line and a curved segment 121 extending in a curved line. The first component 100a and the second component 200a at the corresponding position of the straight segment 122 can be connected through the second welding track 220 in the welding body, and the first component 100a and the second component 200a corresponding to the curved segment can be connected through the first welding track 210 in the welding body.

[0069] An embodiment of the present application provides a welding body 10a, which includes at least one first welding track 210 extending in a curve and at least one second welding track 220 extending in a straight line, and the first overlap rate between each two adjacent first welding points 211 in the first welding track 210 is different from the second overlap rate between each two adjacent second welding points 221 in the second welding track 220. Therefore, during the welding process, different welding methods are used for different welding positions, avoiding the inability to adjust the corresponding welding method according to different welding positions during continuous welding. For example, when welding is performed at a position extending in a straight line on the welding body 10a, the second welding track 220 extending in a straight line can be used for welding. When welding is performed at a position extending in a curve on the welding body 10a, the first welding track 210 extending in a curve can be used for welding. Different positions on the welding body 10a are fully adapted to their respective strengths, avoiding deformation of the welding body 10a due to concentrated welding heat, and reducing the probability of cold welding at the welding position on the welding body 10a, thereby improving the welding sealing at the welding position of the welding body 10a and improving the sealing performance of the battery housing 10.

[0070] refer to Figure 2 and Figure 3 In some embodiments, the welding body 10a can be a battery housing 10, the first component 100a can be a shell 100, and the second component 200a can be a cover plate 200. The shell 100 and the cover plate 200 can be welded together by the welding body. The thickness direction of the cover plate 200 can be a first direction (such as Figure 2 The cover plate 200 and the housing 100 can be arranged along the first direction.

[0071] refer to Figure 1 、 Figure 2 and Figure 3The present invention provides a battery housing 10 in an embodiment. The battery housing 10 can constitute the aforementioned welded body 10a. The battery housing 10 may include a shell 100 and a cover plate 200. The shell 100 constitutes a first component 100a of the welded body 10a, and the cover plate 200 constitutes a second component 200a of the welded body 10a. The shell 100 and the cover plate 200 may both be metal parts. The shell 100 and the cover plate 200 may be connected by welding, for example, by laser penetration welding.

[0072] refer to Figure 2 and Figure 3 The shell 100 has at least one opening 110, and the shell 100 has a connecting portion 120. The inner edge of the connecting portion 120 surrounds the opening 110. The cover plate 200 can be placed on the connecting portion 120 at the opening 110, and the cover plate 200 and the connecting portion 120 of the shell 100 are welded together on the surface of the cover plate 200 facing away from the opening 110, and a welding track is formed between the cover plate 200 and the shell 100.

[0073] The welding track may include at least one first welding track 210 extending in a curve and at least one second welding track 220 extending in a straight line.

[0074] The welding trajectory is a closed trajectory, which includes multiple first welding trajectories 210 extending in a curve and multiple second welding trajectories 220 extending in a straight line. The directions of the extension straight lines of two adjacent second welding trajectories 220 intersect, and the first welding trajectory 210 is located at the corner position defined by the two adjacent second welding trajectories 220.

[0075] The connecting portion 120 may include a plurality of straight segments 122 and a plurality of curved segments 121 , and every two adjacent straight segments 122 are connected by a curved segment 121 .

[0076] refer to Figure 2 and Figure 3 In some embodiments, the outline of the opening 110 on the housing 100 can be a quadrilateral, such as a rectangle or a square. If the outline of the opening 110 is rectangular, the outline of the connecting portion 120 surrounding the opening 110 can also be approximately rectangular. The rectangular connecting portion 120 can have four straight segments 122 and four curved segments 121, with the curved segments 121 located at the corners defined by two adjacent straight segments 122.

[0077] The cover plate 200 can be placed on the connecting portion 120 and cover the opening 110. The cover plate 200 can be welded to the curved section 121 to form a first welding track 210. The cover plate 200 can be welded to the straight section 122 to form a second welding track 220. The first welding track 210 is connected to the second welding track 220. By connecting the first welding track 210 and the second welding track 220, it is possible to avoid the problem of interruption between the first welding track 210 and the second welding track 220, which would reduce the sealing performance of the battery housing 10.

[0078] The first welding track 210 may include multiple first welding points 211, each two adjacent first welding points 211 at least partially overlap, and the overlapping rate between the two adjacent first welding points 211 is a first overlapping rate. By making the two adjacent first welding points 211 at least partially overlap, the continuity of the first welding track 210 can be ensured, and the sealing performance of the cover plate 200 and the shell 100 at the curved section 121 of the connecting portion 120 can be ensured.

[0079] The second welding track 220 may include multiple second welding points 221, each two adjacent second welding points 221 at least partially overlap, and the overlapping rate between two adjacent first welding points 211 is a second overlapping rate. By making the two adjacent second welding points 221 at least partially overlap, the continuity of the second welding track 220 can be ensured, and the sealing performance of the cover plate 200 and the shell 100 at the straight section 122 of the connecting portion 120 can be guaranteed.

[0080] refer to Figure 4 It should be noted that if the reference circle determined by the outer contour of the first welding point 211 is the first reference circle, the overlap rate of the first welding point 211 can be understood as the overlap distance between two adjacent first welding points 211 (such as Figure 4 The ratio of the diameter of the first reference circle to the diameter of the first reference circle.

[0081] It can be understood that the overlap distance H1 may be the distance between the centers of the two first reference circles corresponding to two adjacent overlapping first welding points 211 at the overlapped position.

[0082] In some embodiments, the overlap distance can be adjusted by adjusting the distance between the centers of the first reference circles corresponding to two adjacent first welding points 211. The greater the first overlap ratio between two adjacent first welding points 211, the greater the overlap distance between the two adjacent first welding points 211.

[0083] It can be understood that the first reference circle can be a circle that can be drawn based on the arc-shaped contour part in the outer contour of the first weld point 211. For example, if the outer contour of the first weld point 211 is a semicircle, then the circle that can be drawn based on the arc-shaped contour part of the semicircle is the first reference circle of the first weld point 211.

[0084] refer to Figure 5 It should be noted that if the reference circle determined by the outer contour of the second welding point 221 is the second reference circle, the overlap rate of the second welding point 221 can be understood as the overlap distance between two adjacent second welding points 221 (such as Figure 5 The ratio of the diameter of the second reference circle (shown as H2 in FIG) to the diameter of the second reference circle. It is understood that the second reference circle can be a circle that can be described based on the arcuate portion of the outer contour of the second weld spot 221. For example, if the outer contour of the second weld spot 221 is a semicircle, then the circle that can be described based on the arcuate portion of the semicircle is the second reference circle of the second weld spot 221. The overlap spacing H2 can be the spacing at the overlap between the straight line connecting the centers of the two second reference circles corresponding to two adjacent overlapping second weld spots 221.

[0085] refer to Figure 4 and Figure 5 In some embodiments, the first overlap ratio and the second overlap ratio are different. Specifically, if the radius of the first reference circle corresponding to the first welding point 211 is equal to the radius of the second reference circle corresponding to the second welding point 221, then the difference between the first overlap ratio and the second overlap ratio can be understood as the overlap spacing of the two adjacent first welding points 211 (such as Figure 4 H1 in FIG) and the overlap distance between two adjacent second welding points 221 (as shown in FIG). Figure 5 (shown in H2) is different.

[0086] For example, when the first overlap ratio is greater than the second overlap ratio, the overlap distance H1 between two adjacent first welding spots 211 is greater than the overlap distance H2 between two adjacent second welding spots 221 .

[0087] An embodiment of the present application provides a battery housing 10, which forms at least one first welding track 210 extending in a curve and at least one second welding track 220 extending in a straight line between the housing 100 and the cover plate 200, and makes the first overlap rate of each two adjacent first welding points 211 in the first welding track 210 different from the second overlap rate of each two adjacent second welding points 221 in the second welding track 220, so that when the cover plate 200 is welded to the housing 100, different welding methods are used between the housing 100 and the cover plate 200, avoiding the inability to adjust the appropriate welding method according to different welding positions during continuous welding.

[0088] For example, when the joint between the cover plate 200 and the shell 100 extends in a straight line, a second welding track 220 extending in a straight line can be used for welding; when the joint between the cover plate 200 and the shell 100 extends in a curve, a first welding track 210 extending in a curve can be used for welding, so that different positions can fully adapt to their respective strengths, avoid deformation of the battery shell due to concentrated welding heat, and reduce the probability of cold welding between the shell 100 and the cover plate 200, thereby improving the welding sealing between the cover plate 200 and the shell 100 and improving the sealing performance of the battery shell 10.

[0089] refer to Figure 2 In some embodiments, the shell 100 has two oppositely arranged openings 110, and the cover plates 200 have two, each of which is covered on one opening 110, and each cover plate 200 is welded to the connecting portion 120 surrounding each opening 110, and a first welding track 210 and a second welding track 220 are formed between each cover plate 200 and the shell 100.

[0090] In this way, by providing multiple openings 110, welding the openings 110 to the cover plate 200, and forming a right angle at the connection, the space utilization rate inside the shell 100 can be improved, the flexibility of assembly between the shell 100 and the cover plate 200 can be improved, the flexibility of installing the battery cell 20 in the shell 100 can be improved, and the practicality of the battery shell 10 is improved.

[0091] In some embodiments, the two openings 110 disposed opposite to each other on the housing 100 are opened in the thickness direction of the housing 100 (eg Figure 2 Two surfaces opposite to each other in the Y direction.

[0092] refer to Figure 3 In some embodiments, the plurality of first welding spots 211 are sequentially arranged with equal overlap along the curved extension direction of the first welding track 210. Equal overlap can be understood as meaning that the first overlap between every two adjacent first welding spots 211 in the plurality of first welding spots 211 is substantially equal, and the first overlap between every two adjacent first welding spots 211 may have a certain error.

[0093] In this way, by overlapping and arranging multiple first welding points 211 in sequence along the curved extension direction of the first welding track 210, the continuity of the first welding track 210 can be achieved, and one-time welding from one end to the other end along the extension direction of the curved section 121 can be achieved, thereby improving the welding effect.

[0094] On the basis of the above embodiment, a plurality of second welding spots 221 are sequentially arranged with equal overlap ratios along the straight extension direction of the second welding track 220 .

[0095] In this way, by overlapping the plurality of second welding points 221 in sequence along the straight extension direction of the second welding track 220, the continuity of the second welding track 220 can be achieved, and one-time welding from one end to the other end in the extension direction of the straight line segment 122 can be achieved, thereby improving the welding effect.

[0096] In some embodiments, the overlapping direction of the multiple first welds 211 is consistent with the overlapping direction of the multiple second welds 221. In this way, after the first welding track 210 corresponding to the curved section 121 is formed, the second welding track 220 corresponding to the straight section 122 can be formed by adjusting the energy or frequency of the welding tool without moving the welding tool significantly, thereby improving welding efficiency.

[0097] refer to Figure 3 In some embodiments, the first welding spots 211 at both ends of the first welding track 210 partially overlap with the second welding spots 221 on two adjacent second welding tracks 220, each of which is closer to the first welding track 210. The overlap ratio between the first welding spot 211 and the second welding spot 221 is a fourth overlap ratio. In some embodiments, the fourth overlap ratio between the first welding spot 211 and the second welding spot 221 can be greater than or equal to 35% and less than or equal to 65%. The fourth overlap ratio can be the same as the overlap ratio between two adjacent second welding spots 221.

[0098] refer to Figure 3 In some embodiments, the first overlap ratio is greater than the second overlap ratio. The straight section 122 at the connection portion 120 of the housing 100 has lower strength than the curved section 121. Therefore, the straight section 122 is more likely to deform after being heated than the curved section 121, which can easily lead to a cold weld.

[0099] In this way, by making the first overlap rate of the two adjacent first welding points 211 at the curved section 121 greater than the second overlap rate of the two adjacent second welding points 221 at the straight section 122, the overlap rate between the two adjacent second welding points 221 in the second welding track 220 is smaller, which can help to dissipate the heat at the second welding point 221, and can reduce the heat concentration of the second welding track 220 corresponding to the straight section 122, thereby reducing the probability of deformation of the shell 100 at the corresponding part of the straight section 122, and reducing the probability of cold welding of the shell 100 in the straight section 122, thereby improving the sealing performance of the battery shell 10.

[0100] refer to Figure 3 In some embodiments, the first overlap ratio is greater than or equal to 30% and less than or equal to 85%. For example, the first overlap ratio can be one of 41%, 43%, 47%, 52%, 56%, 58%, 63%, and 66%. Alternatively, the first overlap ratio can be any value within the range of greater than or equal to 30% and less than or equal to 85%.

[0101] This can avoid excessive heat concentration caused by an excessively large first overlap ratio, and further prevent the problem of reduced sealing performance caused by thermal deformation of the housing 100 at the bent section 121. It can also avoid reduced connection stability between the cover plate 200 and the connecting portion 120 at the bent section 121 caused by an excessively small first overlap ratio.

[0102] The second overlap ratio is greater than or equal to 25% and less than or equal to 80%. For example, the second overlap ratio can be one of 27%, 36%, 39%, 41%, 43%, 49%, 53%, 57%, and 63%. Alternatively, the second overlap ratio can be any value within the range of greater than or equal to 25% and less than or equal to 80%.

[0103] This prevents excessive heat concentration caused by an excessively large second overlap ratio, and further prevents reduced sealing performance due to thermal deformation of the housing 100 at the straight section 122. It also prevents reduced connection stability between the cover plate 200 and the connecting portion 120 at the straight section 122 due to an excessively small second overlap ratio.

[0104] refer to Figure 3 and Figure 6 In some embodiments, the first welding track 210 is a circular arc track, and the radius of the circular arc track (eg Figure 6 The radius R of the arc track may be greater than or equal to 0.5 mm and less than or equal to 3 mm. For example, the radius R of the arc track may be one of 0.7 mm, 1.1 mm, 1.3 mm, 1.5 mm, 1.9 mm, 2.1 mm, 2.5 mm, and 2.9 mm. Alternatively, the radius R of the arc track may be any value within the range of greater than or equal to 0.5 mm and less than or equal to 3 mm.

[0105] In this way, by making the first welding trajectory 210 an arc trajectory with a radius greater than or equal to 0.5 mm and less than or equal to 3 mm, the stability of the welding process at the curved section 121 of the connecting portion 120 can be ensured, and the welding quality of the first welding trajectory 210 can be improved.

[0106] refer to Figure 7 In some embodiments, a third welding track 230 is formed between adjacent first welding tracks 210 and second welding tracks 220. The third welding track 230 includes a plurality of third welding spots 231. Every two adjacent third welding spots 231 at least partially overlap, and the overlap ratio between the two adjacent third welding spots 231 is a third overlap ratio. The third overlap ratio is different from the first overlap ratio, and the third overlap ratio is different from the second overlap ratio.

[0107] refer to Figure 7 and Figure 8It should be noted that if the reference circle determined by the outer contour of the third welding point 231 is the third reference circle, the overlap rate of the third welding point 231 can be understood as the overlap distance between two adjacent welding points (such as Figure 8 The ratio of the diameter of the third reference circle (shown as H3 in FIG) to the diameter of the third reference circle. It is understood that the third reference circle can be a circle that can be described by the arcuate portion of the outer contour of the third weld spot 231. For example, if the outer contour of the third weld spot 231 is a semicircle, then the circle that can be described by the arcuate portion of the semicircle is the third reference circle for the third weld spot 231. The overlap spacing H3 can be the distance between the straight line connecting the centers of the two third reference circles corresponding to two adjacent overlapping third weld spots 231 at the overlap location.

[0108] In this way, the adjacent first welding track 210 and the second welding track 220 can be connected through the third welding track 230, thereby ensuring the continuity of the first welding track 210 and the second welding track 220, and improving the connection stability between the shell 100 and the cover plate 200 at the junction of the first welding track 210 and the second welding track 220, thereby improving the sealing performance of the battery shell.

[0109] refer to Figure 7 In some embodiments, the third welding track 230 can extend along a straight line, and the third welding track 230 corresponds to the position of the straight line segment 122 on the connecting portion 120. The third overlap ratio can be greater than the first overlap ratio, thereby improving the connection stability and sealing performance between the straight line segment 122 on the connecting portion 120 corresponding to the third welding track 230 and the cover plate 200.

[0110] refer to Figure 4 and Figure 7 In some examples, if the radius of the first reference circle corresponding to the first welding point 211 is equal to the radius of the third reference circle corresponding to the third welding point 231, then the third overlap ratio is greater than the first overlap ratio. It can be understood that the overlap spacing of the two adjacent first welding points 211 (such as Figure 4 H1 in the figure) is smaller than the overlap distance between two adjacent third welding points 231 (as shown in FIG. Figure 7 (as shown in H3).

[0111] In some examples, the third overlap ratio can be greater than or equal to 35% and less than or equal to 95%. For example, the third overlap ratio can be one of 50%, 55%, 60%, 65%, 70%, 75%, and 85%. Alternatively, the third overlap ratio can be any value within a range of greater than or equal to 35% and less than or equal to 95%.

[0112] This can avoid the problem of excessive heat concentration and thermal deformation at the third welding track 230 due to an excessively large third overlap ratio. It can also avoid the problem of reduced connection stability between the cover plate 200 and the connecting portion 120 due to an excessively small third overlap ratio.

[0113] refer to Figure 7 In some embodiments, along the arrangement direction of the third welding points 231, the size of the third welding track 230 (eg Figure 7 The dimension L1 of the third welding track 230 is greater than 0 mm and less than or equal to 2 mm. For example, the dimension L1 of the third welding track 230 can be one of 0.5 mm, 0.6 mm, 1.2 mm, 1.4 mm, 1.7 mm, and 1.9 mm. Alternatively, the dimension L1 of the third welding track 230 can be any value within the range of greater than 0 mm and less than or equal to 2 mm.

[0114] Thus, because the third overlap ratio is greater than the first overlap ratio, and the third weld track 230 corresponds to a position not near the end of the straight segment 122 at the connection portion, by limiting the size of the third weld track 230 to a range of greater than or equal to 0 mm and less than or equal to 2 mm, it is possible to avoid excessive heat accumulation at the end of the straight segment 122 corresponding to the third weld track 230 due to the third weld track 230 being too large, thereby reducing the probability of deformation of the housing 100 caused by heat accumulation at the straight segment 122 of the connection portion 120. Furthermore, it is possible to avoid poor connection stability between the end of the straight segment 122 corresponding to the third weld track 230 and the cover plate 200 due to the third weld track 230 being too small.

[0115] refer to Figure 7 In some embodiments, the third welding track 230 includes a first welding layer 232 and a second welding layer ( Figure 7 (not shown), if the second component 200a is the cover plate 200, the first direction is the thickness direction of the cover plate 200, and the first welding layer 232 is located on the side of the second welding layer facing away from the cover plate 200 and covers at least a portion of the second welding layer.

[0116] In some embodiments, the extension curve of the first welding trajectory 210 is an independent arc line or a combination of a straight line and an arc line.

[0117] In some embodiments, the extension curve of the first welding trajectory 210 is a combination of a straight line and an arc. The first welding trajectory 210 includes a curved portion 212 extending in a curve and a straight portion 213 extending in a straight line. The extension curve of the curved portion 212 is an independent arc. The curved portion 212 is connected to the straight portion 213 and is arranged between the curved portion 212 and the third welding trajectory 230.

[0118] refer to Figure 9 、 Figure 10 and Figure 11 In some embodiments, along a first direction (e.g. Figure 10 In the Y direction), the first direction may be a direction perpendicular to the thickness of the cover plate 200, and the area of ​​the first weld point 211 accounts for a percentage greater than or equal to 50% and less than or equal to 100% of the area of ​​the first reference circle determined by the outer contour of the first weld point 211. It should be noted that the area of ​​the first weld point 211 here refers to the complete area of ​​the first weld point 211 in the direction perpendicular to the thickness of the cover plate 200, including the exposed area of ​​the first weld point 211 in the direction perpendicular to the thickness of the cover plate 200 and the part covered due to overlap, that is, the area corresponding to the first reference circle between the cover plate 200 and the shell 100 after the first reference circle completely overlaps with the exposed outer contour of the first weld point 211.

[0119] For example, the percentage of the area of ​​the first solder joint 211 to the area of ​​the first reference circle defined by the outer contour of the first solder joint 211 may be any one of 60%, 65%, 70%, 75%, 80%, 85%, 90%, and 95%. Alternatively, the percentage of the area of ​​the first solder joint 211 to the area of ​​the first reference circle defined by the outer contour of the first solder joint 211 may be any value within a range of greater than or equal to 50% and less than or equal to 100%.

[0120] refer to Figure 10 , in the direction perpendicular to the thickness of the cover plate 200, when the laser beam corresponds to the center position of the connecting portion 120 (such as Figure 10 When the area of ​​the first welding spot 211 is as shown by the arrow N in FIG, the percentage of the area of ​​the first welding spot 211 to the area of ​​the first reference circle determined by the outer contour of the first welding spot 211 may be 100%.

[0121] In this way, the first welding point 211 can be kept away from the inner edge of the connecting portion 120 on the shell 100, thereby preventing the portion of the cover plate 200 close to the inner edge of the connecting portion 120 from being welded through, improving welding stability, and reducing the chance of the cover plate 200 being damaged during the welding process.

[0122] In other embodiments, the extension direction of the laser beam may also form a certain angle with the surface of the connecting portion 120 , and the angle may be greater than 0° and less than 90°.

[0123] refer to Figure 11 In some embodiments, if the area of ​​the first welding point 211 accounts for 50% of the area of ​​the first reference circle determined by the outer contour of the first welding point 211, and the laser penetration welding process is used, when the laser beam is in the vertical direction close to the outer edge of the housing 100 (such as Figure 11The laser is emitted toward the cover plate 200 in the Y direction. At this time, only half of the first reference circle corresponding to the laser beam is located on the connecting portion 120 and close to the outer edge of the shell 100.

[0124] refer to Figure 9 、 Figure 10 and Figure 11 In some embodiments, in a direction perpendicular to the thickness of the cover plate 200, the area of ​​the second weld point 221 accounts for a percentage of greater than or equal to 50% and less than or equal to 100% of the area of ​​a second reference circle defined by the outer contour of the second weld point 221, where the second reference circle is a circle defined by the outer contour of the orthographic projection of the second weld point 221 in the thickness direction of the cover plate 200. It should be noted that the area of ​​the second weld point 221 herein refers to the complete area of ​​the second weld point 221 in the direction perpendicular to the thickness of the cover plate 200, including the exposed area of ​​the second weld point 221 in the direction perpendicular to the thickness of the cover plate 200 and the portion covered by the overlap, i.e., the area corresponding to the second reference circle between the cover plate 200 and the housing 100 after the second reference circle completely overlaps with the exposed outer contour of the second weld point 221.

[0125] For example, the percentage of the area of ​​the second weld point 221 to the area of ​​the second reference circle defined by the outer contour of the second weld point 221 may be one of 60%, 65%, 70%, 75%, 80%, 85%, 90%, and 95%. Alternatively, the percentage of the area of ​​the second weld point 221 to the area of ​​the second reference circle defined by the outer contour of the second weld point 221 may be any value within a range of greater than or equal to 50% and less than or equal to 100%.

[0126] In a direction perpendicular to the thickness of the cover plate 200 , when the laser beam corresponds to the center of the connection portion 120 , the area of ​​the second welding point 221 may account for 100% of the area of ​​the second reference circle defined by the outer contour of the second welding point 221 .

[0127] In this way, the second welding point 221 can be kept away from the inner edge of the connecting portion 120 on the shell 100, thereby preventing the portion of the cover plate 200 close to the inner edge of the connecting portion 120 from being welded through, improving welding stability, and reducing the chance of damage to the cover plate 200.

[0128] In some embodiments, the percentage of the area of ​​the second weld point 221 to the area of ​​the second reference circle determined by the outer contour of the second weld point 221 can be equal to the percentage of the area of ​​the first weld point 211 to the area of ​​the first reference circle determined by the outer contour of the first weld point 211.

[0129] refer to Figure 11In some embodiments, if the area of ​​the second welding point 221 accounts for 50% of the area of ​​the second reference circle determined by the outer contour of the second welding point 221, and the laser penetration welding process is used, when the laser beam is close to the outer edge of the housing 100 (such as Figure 11 The laser is emitted toward the cover plate 200 in the vertical direction of the arrow M in FIG. 2 . At this time, only half of the second reference circle corresponding to the laser beam is located on the connecting portion 120 and close to the outer edge of the housing 100.

[0130] refer to Figure 11 In some embodiments, the thickness of the housing 100 (eg Figure 11 The thickness W1 of the housing 100 at the connection portion 120 may be greater than or equal to 0.1 mm and less than or equal to 0.3 mm. The thickness W1 of the housing 100 at the connection portion 120 may also be within a range of greater than or equal to 0.1 mm and less than or equal to 0.3 mm. For example, the thickness W1 of the housing 100 at the connection portion 120 may be one of 0.15 mm, 0.17 mm, 0.21 mm, 0.23 mm, 0.25 mm, and 0.28 mm. Alternatively, the thickness W1 of the housing 100 at the connection portion 120 may be any value within a range of greater than or equal to 0.1 mm and less than or equal to 0.3 mm.

[0131] In this way, by making the thickness W1 of the shell 100 at the connection part 120 greater than or equal to 0.1 mm and less than or equal to 0.3 mm, it is possible to avoid the low welding stability between the cover plate 200 and the shell 100 due to the thickness W1 of the shell 100 at the connection part 120 being too narrow, and it is possible to avoid the increase in the material cost of the shell 100 due to the thickness W1 of the shell 100 at the connection part 120 being too large.

[0132] refer to Figure 11 In some embodiments, the thickness of the cover plate 200 (eg Figure 11 The thickness W2 of the cover plate 200 is greater than or equal to 0.03 mm and less than or equal to 0.1 mm. For example, the thickness W2 of the cover plate 200 may be one of 0.04 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, and 0.09 mm. Alternatively, the thickness W2 of the cover plate 200 may be any value within the range of greater than or equal to 0.03 mm and less than or equal to 0.1 mm.

[0133] In this way, the cover plate 200 can be prevented from being damaged by welding due to being too thin, thereby improving the weldability of the cover plate 200. It can also be prevented from being unable to be welded through due to being too thick, thereby avoiding the problem of cold welding.

[0134] refer to Figure 6 In some embodiments, the diameter of the first reference circle corresponding to the outer contour of the first welding point 211 (eg Figure 6The diameter W3 of the first reference circle is greater than or equal to 0.1 mm and less than or equal to 0.3 mm. For example, the diameter W3 of the first reference circle can be one of 0.15 mm, 0.17 mm, 0.21 mm, 0.23 mm, 0.25 mm, and 0.28 mm. Alternatively, the diameter W3 of the first reference circle can be any value within the range of greater than or equal to 0.1 mm and less than or equal to 0.3 mm.

[0135] In this way, it is possible to avoid the problem of the first welding spot 211 being too small due to the diameter of the first reference circle being too small, thereby avoiding the problem of reduced welding stability or the occurrence of cold welds between the cover plate 200 and the housing 100 at the curved section 121 due to the small first welding spot 211. It is also possible to avoid the problem of the first welding spot 211 being too large due to the diameter of the first reference circle being too large, thereby avoiding the problem of excessive heat during the welding process of the cover plate 200 and the housing 100 being easily deformed at the curved section 121 due to the excessive heat due to the excessive first welding spot 211, thereby improving the weldability between the cover plate 200 and the housing 100.

[0136] refer to Figure 12 In some embodiments, the diameter of the second reference circle determined by the second welding point 221 (eg Figure 12 The diameter W4 of the second reference circle is greater than or equal to 0.1 mm and less than or equal to 0.3 mm. For example, the diameter W4 of the second reference circle may be any value within the range of greater than or equal to 0.1 mm and less than or equal to 0.3 mm.

[0137] In this way, it is possible to avoid the problem of the second welding spot 221 being too small due to the diameter of the second reference circle being too small, thereby avoiding the problem of reduced welding stability or the occurrence of cold welds between the cover plate 200 and the housing 100 at the straight section 122 due to the second welding spot 221 being too small. It is also possible to avoid the problem of the second welding spot 221 being too large due to the diameter of the second reference circle being too large, thereby avoiding the problem of excessive heat during the welding process of the cover plate 200 and the housing 100 being easily deformed at the straight section 122 due to the second welding spot 221 being too large, thereby improving the weldability between the cover plate 200 and the housing 100.

[0138] refer to Figure 2 An embodiment of the present application further provides a battery, which may include a battery cell 20 and a battery casing 10 as described above, wherein the battery cell 20 is disposed in the battery casing 10.

[0139] In this way, by assembling the battery cell 20 in the above-mentioned battery shell 10, the sealing performance of the battery cell 20 in the shell 100 can be improved. If there is electrolyte in the shell 100, the probability of electrolyte leakage can be reduced, thereby improving the sealing performance and safety performance of the battery.

[0140] It should be noted that the battery can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, or a nickel-cadmium battery. This embodiment of the present application does not impose any limitation on this.

[0141] An embodiment of the present application further provides an electrical device, which may include an electrical apparatus and a battery as described above, wherein the battery is used to power the electrical apparatus.

[0142] In this way, by using the above-mentioned battery to power the electrical device, the stability of the process of the battery powering the electrical device can be improved, and the safety of the electrical equipment can be improved.

[0143] Among them, the electrical device can be a mobile phone, a tablet computer or a wearable device, or it can be a vehicle or an energy storage device. Among them, the vehicle can be a new energy vehicle (New Energy Vehicle), such as a pure electric vehicle (Pure Electric Vehicle / Battery Electric Vehicle; abbreviated as: PEV / BEV), a range extended electric vehicle (Range Extended Electric Vehicle; abbreviated as: REEV), a hybrid electric vehicle (Hybrid Electric Vehicle; abbreviated as: HEV), a fuel cell electric vehicle), and the vehicle can also be any vehicle with a battery.

[0144] The electrical device may be a motor or an electronically controlled device, such as vehicle-mounted equipment or air-conditioning components.

[0145] The various embodiments or implementation methods in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referenced to each other.

[0146] It should be noted that phrases such as "in a specific implementation," "in some embodiments," "in this embodiment," and "exemplarily" mentioned in the specification indicate that the described embodiment may include a particular feature, structure, or characteristic, but not every embodiment necessarily includes that particular feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not.

[0147] Generally speaking, terms should be understood, at least in part, based on the context in which they are used. For example, as used herein, the term "one or more" can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense, depending at least in part on the context. Similarly, terms such as "a," "an," or "the" can also be understood to convey either singular or plural usage, depending at least in part on the context.

[0148] It should be readily understood that “on,” “above,” and “over” in this disclosure should be interpreted in the broadest manner, such that “on” means not only “directly on something,” but also includes “on something” with intervening features or layers therebetween, and “above” or “over” includes not only the meaning of “above” or “over,” but also includes “above” or “over” with no intervening features or layers therebetween (i.e., directly on something).

[0149] Additionally, spatially relative terms, such as "below," "beneath," "beneath," "above," and the like, may be used herein for ease of description to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may be in other orientations (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein should be interpreted accordingly.

[0150] 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 welded body, characterized in that: comprising a first component and a second component, A welding track is formed at the joint between the first component and the second component; The welding track includes at least one first welding track extending in a curve and at least one second welding track extending in a straight line, the first welding track includes a plurality of first welding spots, two adjacent first welding spots at least partially overlap, and the overlap ratio of two adjacent first welding spots is a first overlap ratio; the second welding track includes a plurality of second welding spots, two adjacent second welding spots at least partially overlap, and the overlap ratio of two adjacent first welding spots is a second overlap ratio; The first overlap ratio and the second overlap ratio are different.

2. The welded body according to claim 1, wherein: The plurality of first welding spots are sequentially arranged with an equal overlap rate along the extension direction of the curve; the plurality of second welding spots are sequentially arranged with an equal overlap rate along the extension direction of the straight line.

3. The welded body according to claim 1, wherein: The first overlap ratio is greater than the second overlap ratio.

4. The welded body according to claim 3, wherein: The first overlap ratio is greater than or equal to 30% and less than or equal to 85%; And / or, the second overlap ratio is greater than or equal to 25% and less than or equal to 80%.

5. The welded body according to claim 1, wherein: The first welding trajectory is an arc trajectory, and the radius of the arc trajectory is greater than or equal to 0.5 mm and less than or equal to 3 mm.

6. The welded body according to any one of claims 1 to 5, characterized in that: The welding trajectory is a closed trajectory, and the welding trajectory includes multiple first welding trajectories extending in curves and multiple second welding trajectories extending in straight lines. The directions of the extension straight lines of two adjacent second welding trajectories intersect, and the first welding trajectory is located at the corner position defined by the two adjacent second welding trajectories.

7. The welded body according to claim 6, wherein: A third welding track is formed between the adjacent first welding track and the second welding track, the third welding track includes a plurality of third welding spots, each two adjacent third welding spots at least partially overlap, and an overlapping ratio of the two adjacent third welding spots is a third overlapping ratio; The third overlap ratio is different from the first overlap ratio, and the third overlap ratio is different from the second overlap ratio.

8. The welded body according to claim 7, wherein: The third overlap ratio is greater than the first overlap ratio.

9. The welded body according to claim 7, wherein: The third overlap ratio is greater than or equal to 35% and less than or equal to 95%.

10. The welded body according to claim 7, wherein: The third welding trajectory extends along a straight line.

11. The welded body according to claim 7, wherein: Along the arrangement direction of the third welding points, a size of the third welding track is greater than 0 mm and less than or equal to 2 mm.

12. The welded body according to claim 7, wherein: The third welding track includes a first welding layer and a second welding layer. Along a first direction, the first welding layer covers at least a portion of the second welding layer.

13. The welded body according to claim 7, wherein: The extension curve of the first welding trajectory is an independent arc or a combination of a straight line and an arc.

14. The welded body according to claim 13, wherein: The extension curve of the first welding trajectory is a combination of a straight line and an arc. The first welding trajectory includes a curved portion extending in a curve and a straight portion extending in a straight line. The extension curve of the curved portion is an independent arc. The curved portion is connected to the straight portion, and the straight portion is arranged between the curved portion and the third welding trajectory.

15. The welded body according to any one of claims 6, characterized in that: The first welding spots at both ends of the first welding track are respectively overlapped and connected with the second welding spots on two adjacent second welding tracks close to one side of the first welding track.

16. The welded body according to any one of claims 1 to 5, characterized in that: Along the first direction, the area of ​​the first welding spot accounts for a percentage greater than or equal to 50% and less than or equal to 100% of the area of ​​a first reference circle, wherein the first reference circle is a circle determined according to the outer contour of the positive projection of the first welding spot in the first direction.

17. The welded body according to any one of claims 1 to 5, characterized in that: Along the first direction, the area of ​​the second weld point accounts for a percentage of an area of ​​a second reference circle that is greater than or equal to 50% and less than or equal to 100%, wherein the second reference circle is a circle determined by an outer contour of an orthographic projection of the second weld point in the first direction; and / or the diameter of the first reference circle is greater than or equal to 0.1 mm and less than or equal to 0.3 mm, wherein the first reference circle is a circle determined by an outer contour of an orthographic projection of the second weld point in the first direction; And / or, a diameter of the second reference circle is greater than or equal to 0.1 mm and less than or equal to 0.3 mm, wherein the second reference circle is a circle determined according to an outer contour of an orthographic projection of the second welding point in the first direction.

18. A battery casing, characterized in that: The battery case constitutes the welded body according to any one of claims 1 to 16, and includes a shell and a cover plate. The shell constitutes the first member of the welded body, and the cover plate constitutes the second member of the welded body.

19. The battery housing according to claim 18, wherein: The thickness of the shell is greater than or equal to 0.1 mm and less than or equal to 0.3 mm; And / or, the thickness of the cover plate is greater than or equal to 0.03 mm and less than or equal to 0.1 mm.

20. The battery housing according to claim 18, wherein The housing has two openings arranged opposite to each other; There are two cover plates, each of which is disposed on one of the openings, and a first welding track and a second welding track of the welding body are formed between each of the cover plates and the shell.

21. A battery, characterized in that: A battery cell and a battery casing according to any one of claims 18 to 20; The battery core is arranged in the battery casing.

22. An electrical device, characterized in that: It comprises an electric device and the battery as claimed in claim 21, wherein the battery is used to power the electric device.

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