Cylindrical battery and electronic equipment

Abstract

The utility model provides a cylindrical battery and electronic equipment, and relates to the technical field of batteries, one first edge of a connecting piece is connected with a main body of a current collecting component in a shell, the connecting piece is welded with the inner wall of the shell, a welding mark is formed at the welding position of the connecting piece and the shell, and the shortest distance from the welding mark to the first edge is a first distance; the distance between the two first edges is a second distance, the ratio of the first distance to the second distance is larger than or equal to 0.1 and smaller than 0.5, the shortest distance between the welding marks and the second edges is a third distance, the distance between the two second edges oppositely arranged on the connecting piece is a fourth distance, and the ratio of the third distance to the fourth distance is larger than or equal to 0.2 and smaller than 0.5. According to the cylindrical battery disclosed by the invention, a relatively good welding effect and a relatively good overflowing effect between the current collecting component and the shell can be realized at the connecting piece, and the use performance and the use stability of the cylindrical battery are improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a cylindrical battery and an electronic device. Background Art

[0002] Cylindrical batteries are widely used in the lithium battery industry. Cylindrical batteries use the metal shell as the negative electrode, the electrode assembly is welded to the current collector and placed in the shell, and the connecting piece on the current collector is welded to the inner wall of the steel shell by laser penetration welding, so that the negative electrode of the electrode assembly is connected to the steel shell, so that the steel shell of the battery can be used as the negative electrode of the cylindrical battery.

[0003] However, the welding effect between the connecting piece and the inner wall of the shell in the above-mentioned related art is poor, which affects the connection stability between the connecting piece and the shell and the current flow effect. Utility Model Content

[0004] The embodiments of the present application provide a cylindrical battery and an electronic device, which are used to solve the technical problem that the welding effect between the connecting piece and the shell is poor, affecting the connection stability between the connecting piece and the shell and the overcurrent effect of the current.

[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 cylindrical battery, comprising:

[0007] a housing including an opening;

[0008] Electrode assembly, including tabs;

[0009] The current collecting component comprises a main body and a connecting piece connected to the edge of the main body, the main body is connected to the pole ear, the connecting piece is welded to the inner wall of the shell, and a weld mark is formed at the welding point between the connecting piece and the shell;

[0010] The connecting piece has two first edges arranged opposite to each other along its width direction, and two second edges arranged opposite to each other along its length direction, wherein one of the first edges is connected to the main body;

[0011] Along the width direction, the shortest distance from the weld mark to the first edge is a first distance, and the distance between two first edges is a second distance; the ratio of the first distance to the second distance is greater than or equal to 0.1 and less than 0.5;

[0012] Along the length direction, the shortest distance from the weld mark to the second edge is a third distance, and the distance between two second edges is a fourth distance; the ratio of the third distance to the fourth distance is greater than or equal to 0.2 and less than 0.5.

[0013] Based on the above technical solution, the present application can also be improved as follows.

[0014] In a possible implementation, the first distance is greater than or equal to 0.5 mm and less than or equal to 1 mm;

[0015] The third distance is greater than or equal to 3 mm and less than or equal to 5 mm.

[0016] In a possible implementation, the second distance is greater than or equal to 2 mm and less than or equal to 5 mm; and the fourth distance is greater than or equal to 6 mm and less than or equal to 15 mm.

[0017] In a possible implementation, in the width direction of the connecting piece, the width of the weld mark is greater than or equal to 0.2 mm and less than or equal to 3 mm;

[0018] In the length direction of the connecting piece, the length of the weld mark is greater than or equal to 4 mm and less than or equal to 10 mm.

[0019] In a possible implementation, the connecting piece further includes a fixing portion, the fixing portion is located between the weld mark and the second edge, and the fixing portion is configured to allow a fixing device to abut the connecting piece against an inner wall of the housing;

[0020] The fixing parts are two and are respectively arranged at two sides of the connecting piece along the length direction.

[0021] In a possible implementation, the welding mark includes a plurality of welding lines, the plurality of welding lines all extend along the length direction of the connecting piece, and the plurality of welding lines are arranged at intervals along the width direction of the connecting piece;

[0022] In a possible implementation, the welding mark includes a plurality of welding lines, the plurality of welding lines all extend along the width direction of the connecting piece, and the plurality of welding lines are arranged at intervals along the length direction of the connecting piece;

[0023] In a possible implementation, the distance between any two adjacent welding lines is greater than or equal to 0.05 mm and less than or equal to 0.5 mm.

[0024] In a possible implementation, the weld mark is a straight weld line;

[0025] A second aspect of an embodiment of the present application provides an electronic device, which includes the above-mentioned cylindrical battery.

[0026] The embodiments of the present application provide a cylindrical battery and an electronic device. The cylindrical battery includes a shell, an electrode assembly, and a current collecting member, and the ratio of the first distance to the second distance is greater than or equal to 0.1 and less than 0.5. When the connecting piece is welded to the inner wall of the shell, it is possible to avoid welding the first edge of the connecting piece to the inner wall of the shell with a weld mark, and it is possible to avoid affecting the connection strength between the connecting piece and the shell due to the low connection strength of the weld mark between the first edge and the inner wall of the shell, thereby improving the connection strength between the connecting piece and the shell, and the current flow effect at the welding point between the connecting piece and the shell.

[0027] Furthermore, by making the ratio of the third distance to the fourth distance greater than or equal to 0.2 and less than 0.5, a certain space can be reserved on the connecting piece between the weld mark and the second edge of the connecting piece in the length direction of the connecting piece, so as to provide an area for the fixing device to relatively fix the connecting piece and the inner wall of the shell during the welding process of the connecting piece, so that the welding between the connecting piece and the inner wall of the shell is more stable, thereby improving the connection stability between the connecting piece and the inner wall of the shell, and the current flow effect at the welding point between the connecting piece and the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] 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 paying any creative work.

[0029] Figure 1 A schematic diagram of the installation structure of a current collecting component of a cylindrical battery provided in an embodiment of the present application;

[0030] Figure 2 A schematic diagram of a partial structure of a cylindrical battery provided in an embodiment of the present application;

[0031] Figure 3 A schematic diagram of the welding form of the first connecting piece provided in the embodiment of the present application;

[0032] Figure 4 A schematic diagram of the welding form of the second connecting piece provided in the embodiment of the present application;

[0033] Figure 5 A schematic diagram of the welding form of the third connecting piece provided in the embodiment of the present application;

[0034] Figure 6 A schematic diagram of the welding form of the fourth connecting piece provided in the embodiment of the present application;

[0035] Figure 7A schematic diagram of the structure of a battery pack provided in an embodiment of the present application;

[0036] Figure 8 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application.

[0037] Description of reference numerals:

[0038] 1-Electronic equipment; 10-Cylindrical battery; 20-Laser penetration welding equipment; 30-Battery pack;

[0039] 11-working part; 31-box body; 32-box cover;

[0040] 100-housing;

[0041] 110-opening;

[0042] 200-connecting piece;

[0043] 210 - first edge; 220 - second edge; 230 - weld mark; 240 - fixing portion;

[0044] 231-welding wire;

[0045] 300-current collecting component;

[0046] 310-Main body. DETAILED DESCRIPTION

[0047] As described in the background art, the welding effect between the connecting piece and the inner wall of the shell in the prior art is poor, which affects the connection stability between the connecting piece and the shell and the current flow effect.

[0048] The reason for this problem is that when the connecting piece is connected to the inner wall of the shell, it is generally necessary to first relatively fix the connecting piece and the inner wall of the shell through a fixing device. If the area to be welded is close to the edge of the connecting piece, the area on the connecting piece used to contact the fixing device will be too small, which is not conducive to the fixing device to fix the connecting piece, or the fixing device can only relatively fix one end of the connecting piece to the inner wall of the shell, which will cause the other end of the connecting piece away from the fixed end to tilt up, or the connecting piece cannot be effectively fixed to the inner wall of the shell, resulting in poor connection between the welding area and the inner wall of the shell after laser welding in the welding area, affecting the connection stability between the connecting piece and the shell.

[0049] Furthermore, when welding the connecting piece to the inner wall of the shell, if the welding area on the connecting piece is too close to the edge of the connecting piece, the edge of the connecting piece and the inner wall of the shell may be welded together. Since the connection strength of the weld mark here is low, the connection strength between the connecting piece and the inner wall of the shell will be low, and the connection stability between the rigid connecting piece and the inner wall of the shell will be reduced.

[0050] In response to the above technical problems, the embodiments of the present application provide a cylindrical battery and an electronic device. The cylindrical battery includes a shell, an electrode assembly and a current collecting member, and the ratio of the first distance to the second distance is greater than or equal to 0.1 and less than 0.5. When the connecting piece is welded to the inner wall of the shell, it is possible to avoid welding the first edge of the connecting piece to the inner wall of the shell. The connection strength between the connecting piece and the shell is not affected by the low connection strength of the weld mark between the first edge and the inner wall of the shell, thereby improving the connection strength between the connecting piece and the shell, as well as the current flow effect at the welding point between the connecting piece and the shell.

[0051] Furthermore, by making the ratio of the third distance to the fourth distance greater than or equal to 0.2 and less than 0.5, a certain space can be reserved on the connecting piece between the weld mark and the second edge of the connecting piece in the length direction of the connecting piece, so as to provide an area for the fixing device to relatively fix the connecting piece and the inner wall of the shell during the welding process of the connecting piece, so that the welding between the connecting piece and the inner wall of the shell is more stable, thereby improving the connection stability between the connecting piece and the inner wall of the shell, and the current flow effect at the welding point between the connecting piece and the shell.

[0052] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present application more obvious and understandable, 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 creative work belong to the scope of protection of this application.

[0053] refer to Figure 1 and Figure 2 The embodiment of the present application provides a cylindrical battery 10, which may include a housing 100. The cylindrical battery 10 may also include an electrode assembly and a current collecting member 300. The current collecting member 300 may include a main body 310 and a connecting piece 200 connected to the edge of the main body 310. The electrode assembly may include a tab, which may be welded to the main body 310 so that the tab can transmit current through the current collecting member 300 and the housing 100 of the cylindrical battery.

[0054] The shell 100 has an opening 110, and the electrode assembly can be arranged in the shell 100 through the opening 110. The current collecting component 300 is connected to the negative electrode tab of the electrode assembly, the connecting piece 200 is connected to the outer edge of the current collecting component 300, and the connecting piece 200 is connected to the inner wall of the shell 100 by laser penetration welding, so that the shell 100 of the cylindrical battery 10 is used as the negative electrode.

[0055] In a specific implementation, the laser penetration welding device can perform laser penetration welding from the connecting piece 200 to the inner wall of the shell 100 in the opening 110 on the shell 100 , so as to weld the connecting piece 200 to the inner wall of the shell 100 .

[0056] refer to Figure 1 and Figure 2 The connecting piece 200 has two first edges 210 arranged opposite to each other along its own width direction, and two second edges 220 arranged opposite to each other along its own length direction, one of the first edges 210 is used to be connected to the current collecting component 300 in the shell 100, and the other first edge 210 abuts against the inner wall of the shell 100.

[0057] refer to Figure 2 The connecting piece 200 may include a welding mark 230 having the same length extension direction and width extension direction as the connecting piece 200 , and the welding mark 230 has a plurality of welding lines 231 , and the connecting piece 200 is connected to the inner wall of the shell 100 through the welding lines 231 .

[0058] It can be understood that the welding line 231 is a welding mark left on the welding mark 230 of the connecting piece 200 when the laser penetration welding equipment 20 performs laser penetration welding on the connecting piece 200 and the inner wall of the shell 100 .

[0059] refer to Figure 2 and Figure 3 In the width direction of the connecting piece 200, the shortest distance from the welding mark 230 to the first edge 210 is a first distance (eg Figure 3 The distance between the two first edges 210 is the second distance (as shown in FIG. Figure 3 The ratio of the first distance to the second distance is greater than or equal to 0.1 and less than 0.5.

[0060] In this way, by making the ratio of the first distance to the second distance greater than or equal to 0.1 and less than 0.5, it is possible to avoid the weld mark 230 connecting the first edge 210 of the connecting piece 200 to the inner wall of the shell 100 when the connecting piece 200 is welded to the inner wall of the shell 100, and it is possible to avoid the connection strength between the connecting piece 200 and the shell 100 being affected by the low connection strength of the weld mark 230 between the first edge 210 and the inner wall of the shell 100, thereby improving the connection strength between the connecting piece 200 and the shell 100, as well as the overcurrent effect of the current at the welding point between the connecting piece 200 and the shell 100.

[0061] Furthermore, since the connecting piece 200 and the inner wall of the shell 100 are arranged at a relative inclination, there is a gap between the connecting piece 200 and the inner wall of the shell 100, and the closer the connecting piece 200 is to the current collecting component 300 in the width direction, the larger the gap between the connecting piece 200 and the inner wall of the shell 100, which is less conducive to the laser penetration welding process between the connecting piece 200 and the inner wall of the shell 100.

[0062] By making the weld mark 230 not too close to the first edge 210 connected to the current collecting member 300 , the problem of reduced welding strength due to an excessively large gap between the connecting sheet 200 and the inner wall of the housing 100 can be avoided.

[0063] In some embodiments, the ratio of the first distance to the second distance may be 0.2, 0.3, 0.4, or 0.45. If the ratio of the first distance to the second distance is too small, the weld mark 230 may be too close to the first edge 210 of the connecting piece 200, and the joint between the first edge 210 and the inner wall of the housing 100 may be welded easily. Since the welding strength at this point is relatively low, the connection strength between the connecting piece 200 and the inner wall of the housing 100 may be affected.

[0064] If the ratio between the first distance and the second distance is too large, the width of the weld mark 230 will be too small, thereby reducing the area ratio of the weld mark 230 on the connecting piece 200, affecting the welding area on the connecting piece 200, and also affecting the connection strength between the connecting piece 200 and the inner wall of the shell 100, thereby reducing the conductivity between the electrode assembly and the shell 100.

[0065] refer to Figure 2 and Figure 3 In the length direction of the connecting piece 200, the shortest distance from the welding mark 230 to the second edge 220 is the third distance (eg Figure 3 The distance between the two second edges 220 is a fourth distance (as shown in FIG. Figure 3 The ratio of the third distance to the fourth distance is greater than or equal to 0.2 and less than 0.5.

[0066] In this way, by making the ratio between the third distance and the fourth distance greater than or equal to 0.2 and less than 0.5, a certain space can be reserved on the connecting piece 200 between the weld mark 230 and the second edge 220 in the length direction of the weld mark 230, so that the connecting piece 200 and the inner wall of the shell 100 can be relatively fixed by a fixing device during the process of providing the welding connecting piece 200, so that the welding of the weld mark 230 on the connecting piece 200 and the inner wall of the shell 100 is more stable, thereby improving the connection stability between the connecting piece 200 and the inner wall of the shell 100, and the current flow effect at the welding point between the connecting piece 200 and the shell 100.

[0067] In some embodiments, the ratio between the third distance and the fourth distance may be 0.2, 0.3, 0.4 or 0.46. If the ratio between the third distance and the fourth distance is less than 0.2, it is not conducive to the fixing device to fix the connecting piece 200, and the abutment stability between the connecting piece 200 and the inner wall of the housing 100 during the welding process is reduced. In addition, when fixing, it is easy to cause the connecting piece 200 to be warped and generate a gap between it and the inner wall of the housing 100, reducing the welding effect between the connecting piece 200 and the housing 100.

[0068] If the ratio between the first distance and the second distance is too large, the length of the weld mark 230 will be too short, reducing the area ratio of the weld mark 230 on the connecting piece 200 and the welding area on the connecting piece 200, thus affecting the connection strength between the connecting piece 200 and the shell 100.

[0069] refer to Figure 1 In some embodiments, there are multiple connecting sheets 200 , and the multiple connecting sheets 200 are arranged at intervals on the outer peripheral side of the current collecting component 300 .

[0070] In this way, by providing multiple connecting sheets 200, the current collecting component 300 can be connected to the shell 100 through multiple connecting sheets 200, which can improve the connection strength and connection stability between the current collecting component 300 and the shell 100, and can improve the flow effect between the electrode assembly and the shell 100.

[0071] refer to Figure 3 In some embodiments, the first distance is greater than or equal to 0.5 mm and less than or equal to 1 mm. For example, the first distance may be 0.5 mm, 0.6 mm, 0.7 mm, or 0.8 mm.

[0072] In this way, when the width of the connecting sheet 200 is constant, it is possible to avoid the problem that the welding mark 230 is too close to the first edge 210 due to the first distance being too small, thereby preventing the welding mark 230 from welding the joint between the first edge 210 and the inner wall of the housing 100. It is also possible to avoid the problem that the width of the welding mark 230 is too small due to the first distance being too large, thereby reducing the area ratio of the welding line 231 on the connecting sheet 200 and affecting the connection strength between the connecting sheet 200 and the inner wall of the housing 100.

[0073] In some embodiments, the third distance is greater than or equal to 3 mm and less than or equal to 5 mm. For example, the third distance may be 3 mm, 4 mm, 4.5 mm or 5 mm.

[0074] In this way, when the length of the connecting piece 200 is constant, it is possible to avoid the welding mark 230 being too close to the second edge 220 due to the third distance being too small, thereby preventing the fixing device from being unable to abut the connecting piece 200 against the inner wall of the housing 100, and it is possible to avoid the problem that the connecting piece 200 is easily lifted up during fixing, resulting in a gap between the inner wall of the housing 100 and reducing the welding effect between the connecting piece 200 and the housing 100. It is also possible to avoid the problem that the length of the welding mark 230 is too short due to the third distance being too large, reducing the area ratio of the welding mark 230 on the connecting piece 200, and affecting the connection strength between the connecting piece 200 and the housing 100.

[0075] refer to Figure 3 In some embodiments, the second distance is greater than or equal to 2 mm and less than or equal to 5 mm. For example, the second distance may be 2 mm, 3 mm, 4 mm, or 5 mm. The fourth distance is greater than or equal to 6 mm and less than or equal to 15 mm. For example, the fourth distance may be 6 mm, 7 mm, 8 mm, 9 mm, 11 mm, 13 mm, or 14 mm.

[0076] In some embodiments, if the ratio between the first distance and the second distance remains unchanged, and the ratio between the third distance and the fourth distance remains unchanged, the size of the weld mark 230 will increase as the size of the connecting piece 200 increases, or the size of the weld mark 230 will decrease as the size of the connecting piece 200 decreases.

[0077] In this way, it is possible to avoid the situation where the size of the welding mark 230 is too small due to the size of the connecting piece 200 being too small, and further avoid the situation where the connection strength between the connecting piece 200 and the inner wall of the shell 100 is reduced due to the welding mark 230 being too small, and the connection stability between the connecting piece 200 and the inner wall of the shell 100 can be improved.

[0078] refer to Figure 3 In some embodiments, in the width direction of the connecting piece 200, the width of the weld mark 230 (eg Figure 3 The width of the weld mark 230 may be 0.3 mm, 0.5 mm, 1.2 mm, 1.7 mm, 2.5 mm, or 2.9 mm.

[0079] In this way, it is possible to avoid the problem that the welding area between the connecting piece 200 and the inner wall of the housing 100 is reduced due to the width of the welding mark 230 being too small, thereby reducing the connection stability between the connecting piece 200 and the housing 100. It is also possible to avoid the problem that the welding mark 230 is too close to the first edge 210 of the connecting piece 200 due to the width of the welding mark 230 being too large, thereby possibly causing the welding mark 230 to extend to the joint between the first edge 210 and the inner wall of the housing 100, thereby affecting the connection strength between the connecting piece 200 and the housing 100.

[0080] refer to Figure 3 , in the length direction of the connecting piece 200, the length of the weld mark 230 (eg Figure 3 The length of the weld mark 230 may be 5 mm, 6 mm, 7 mm, 8 mm or 9 mm.

[0081] In this way, the problem that the welding area is reduced and the connection stability between the connecting piece 200 and the housing 100 is reduced due to the length of the welding mark 230 being too small can be avoided. The problem that the welding mark 230 is too close to the second edge 220 of the connecting piece 200 due to the length of the welding mark 230 being too large can also be avoided, thereby causing the connecting piece 200 to be tilted and a gap to be generated between the connecting piece 200 and the inside of the housing 100 when the fixing device abuts the connecting piece 200 against the inner wall of the housing 100 can be avoided.

[0082] refer to Figure 3 In some embodiments, the connecting piece 200 may further include a fixing portion 240 , which is located between the weld mark 230 and the second edge 220 , and the fixing portion 240 is configured to allow a fixing device to abut the connecting piece 200 against the inner wall of the shell 100 .

[0083] In this way, by setting a fixing portion 240 between the weld mark 230 and the second edge 220, during the welding process of the connecting piece 200 and the shell 100, the connecting piece 200 can be pressed against the inner wall of the shell 100 at the fixing portion 240 by using a fixing device, and the probability of the connecting piece 200 moving relative to the shell 100 during the welding process is reduced, thereby improving the welding quality and further improving the connection stability between the connecting piece 200 and the shell 100.

[0084] In some embodiments, there are two fixing portions 240 , and the two fixing portions 240 are respectively disposed on two sides of the welding mark 230 along the length direction.

[0085] In this way, by providing two fixing parts 240, the connecting piece 200 can be fixed simultaneously on both sides of the length direction of the welding mark 230, further reducing the probability of the connecting piece 200 being offset during the welding process, and further improving the welding effect and connection stability between the connecting piece 200 and the shell 100.

[0086] refer to Figure 3 and Figure 4 In some embodiments, the plurality of welding lines 231 extend along the length direction of the welding mark 230 , and the plurality of welding lines 231 are arranged at intervals along the width direction of the welding mark 230 .

[0087] In this way, by forming a plurality of welding lines 231 spaced apart from each other and extending in the length direction on the welding mark 230, the connection piece 200 can be connected to the inner wall of the housing 100 through the welding lines 231, thereby improving the connection stability between the connection piece 200 and the housing 100. Compared with the arrangement in which the welding lines 231 extend in the width direction of the welding mark 230, by extending the plurality of welding lines 231 in the length direction of the welding mark 230, the probability of the connection piece 200 being lifted in the length direction can be reduced.

[0088] In some embodiments, the plurality of welding wires 231 are evenly and spaced apart along the width direction of the welding mark 230. Thus, by evenly and spaced apart along the width direction of the welding mark 230, the distribution uniformity of the welding wires 231 can be improved, thereby improving the uniformity of welding between the connecting piece 200 and the inner wall of the housing 100, improving the welding quality and the connection stability of the connecting piece 200 and the housing 100.

[0089] refer to Figure 5 and Figure 6 In some embodiments, the plurality of welding lines 231 extend along the width direction of the welding mark 230 , and the plurality of welding lines 231 are arranged at intervals along the length direction of the welding mark 230 .

[0090] Thus, by forming a plurality of welding lines 231 spaced apart from each other and extending in the width direction on the welding mark 230 , the connecting piece 200 can be connected to the inner wall of the shell 100 through the welding lines 231 , and the probability of the connecting piece 200 warping in the width direction can be reduced.

[0091] In some embodiments, the plurality of welding wires 231 are evenly and spaced apart along the length direction of the welding mark 230. Thus, by evenly and spaced apart along the length direction of the welding mark 230, the distribution uniformity of the welding wires 231 can be improved, thereby improving the uniformity of welding between the connecting piece 200 and the inner wall of the housing 100, improving the welding quality and the connection stability of the connecting piece 200 and the housing 100.

[0092] refer to Figure 3 In some embodiments, the distance between each two adjacent welding lines 231 (eg Figure 3 (as shown in L7 in FIG. 1 ) is greater than or equal to 0.05 mm and less than or equal to 0.5 mm. For example, the distance between each two adjacent welding lines 231 may be 0.1 mm, 0.2 mm, 0.3 mm or 0.4 mm.

[0093] In this way, it is possible to avoid the heat generated by the weld line 231 being formed from diffusing to the adjacent previous weld line 231 due to the distance between two adjacent weld lines 231 being too small, thereby affecting the cooling rate of the completed weld line 231. It is also possible to avoid the number of weld lines 231 in the weld mark 230 being too small due to the distance between two adjacent weld lines 231 being too large, thereby affecting the welding strength and connection stability between the connecting piece 200 and the inner wall of the housing 100.

[0094] refer to Figures 3 to 6 In some embodiments, each line segment with an arrow may be a welding line 231, wherein the direction of the arrow is the end of the welding line 231, and the other end opposite is the beginning of the welding line 231. The welding lines 231 are in a discontinuous state.

[0095] refer to Figure 3 and Figure 5 When the welding wires 231 extend along the length direction of the welding mark 230 or along the width direction of the welding mark 230, the starting end of each welding wire 231 can be arranged on the same side, and the end of each welding wire 231 can also be arranged on the same side. In this way, sufficient cooling time can be provided for the previous welding wire 231, so as to avoid the formation process of the starting end of the next welding wire 231 affecting the cooling process of the end of the previous welding wire 231, thereby reducing the probability of the welding strength between the connecting piece 200 and the inner wall of the housing 100 being reduced due to the failure of the previous welding wire 231 to cool in time.

[0096] refer to Figure 4 and Figure 6 When the welding wire 231 extends along the length direction of the welding mark 230 or along the width direction of the welding mark 230, the starting ends of two adjacent welding wires 231 can be relatively arranged in the extension direction of the welding wire 231, and the ends of two adjacent welding wires 231 can also be relatively arranged in the extension direction of the welding wire 231.

[0097] In this way, when the laser penetration welding device 20 completes the previous welding line 231 , the next welding line 231 can be formed by moving the interval between two adjacent welding lines 231 , thereby improving the welding efficiency.

[0098] refer to Figures 3 to 6In a possible implementation, the welding wire 231 is a straight welding wire 231. In this way, compared with the use of sinusoidal welding wires 231 in the prior art, the number of welding wires 231 on the welding mark 230 can be increased, thereby improving the welding strength between the connecting piece 200 and the welding mark 230, and further improving the connection stability between the connecting piece 200 and the housing 100.

[0099] Furthermore, by increasing the number of welding wires 231 on the welding mark 230, the welding area between the connecting sheet 200 and the shell 100 can be effectively increased, thereby improving the current flow effect of the electrode assembly transmitting current to the shell 100 through the current collecting member 300 and the connecting sheet 200.

[0100] refer to Figure 7 and Figure 8 The embodiment of the present application further provides an electronic device 1, which may include the cylindrical battery 10 mentioned above.

[0101] Specifically, a plurality of cylindrical batteries 10 are connected in series or in parallel, or in a mixture of series and parallel to form a battery pack 30 , and the working part 11 is electrically connected to the battery pack 30 to obtain electrical energy support.

[0102] refer to Figure 7 and Figure 8 As an example, the battery pack 30 may also include a box body 31 and a box cover 32. A plurality of cylindrical batteries 10 are placed in the box body 31, and the box cover 32 is sealed on the box body 31 to protect the plurality of cylindrical batteries 10. It should be noted that the battery pack 30 may also include a battery pack thermal management system, a circuit board, and other parts in addition to the cylindrical batteries 10 of the present application. The battery pack 30 may be a battery module, a battery pack, an energy storage cabinet, etc.; they will not be described one by one here.

[0103] As an example, the electronic device 1 is a vehicle, which can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc., but is not limited thereto. The working part 11 is the vehicle body, and the battery pack 30 is arranged at the bottom of the vehicle body, and provides power support for the driving of the vehicle or the operation of the electrical components in the vehicle. However, in some other embodiments, the electronic device 1 can also be a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecrafts, etc.; the working part 11 can be a unit component that can obtain the power of the battery pack 30 and perform corresponding work, such as a fan blade rotation unit, a vacuum cleaner working unit, etc.

[0104] Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The present application embodiment does not impose any special restrictions on the above-mentioned electronic device 1.

[0105] 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.

[0106] It should be noted that the phrases "in specific implementation", "in some embodiments", "in this embodiment", "exemplarily" and the like mentioned in the specification indicate that the described embodiment may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when describing specific features, structures or characteristics in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in conjunction with other embodiments that are explicitly or not explicitly described.

[0107] In general, terms should be understood, at least in part, by the context in which they are used. For example, the term "one or more" as used herein may be used to describe any feature, structure, or characteristic in a singular sense, or may be used to describe a combination of features, structures, or characteristics in a plural sense, depending, at least in part, on the context. Similarly, terms such as "a," "an," or "the" may also be understood to convey singular usage or to convey plural usage, depending, at least in part, on the context.

[0108] It should be easily understood that “on,” “above,” and “over” in the present disclosure should be interpreted in the broadest manner, so that “on” not only means “directly on something,” but also includes the meaning of “on something” with intervening features or layers therebetween, and “above” or “over” not only includes the meaning of “above” or “over,” but also may include the meaning of “above” or “over something” with no intervening features or layers therebetween (i.e., directly on something).

[0109] In addition, spatially relative terms, such as "below," "below," "beneath," "above," "above," etc., 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 shown in the figures. The device may have other orientations (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein may likewise be interpreted accordingly.

[0110] 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 it. 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 replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A cylindrical battery, characterized in that: include: a housing including an opening; Electrode assembly, including tabs; The current collecting component comprises a main body and a connecting piece connected to the edge of the main body, the main body is connected to the pole ear, the connecting piece is welded to the inner wall of the shell, and a weld mark is formed at the welding point between the connecting piece and the shell; The connecting piece has two first edges arranged opposite to each other along its width direction, and two second edges arranged opposite to each other along its length direction, wherein one of the first edges is connected to the main body; Along the width direction, the shortest distance from the weld mark to the first edge is a first distance, and the distance between two first edges is a second distance; the ratio of the first distance to the second distance is greater than or equal to 0.1 and less than 0.5; Along the length direction, the shortest distance from the weld mark to the second edge is a third distance, and the distance between two second edges is a fourth distance; the ratio of the third distance to the fourth distance is greater than or equal to 0.2 and less than 0.

5.

2. The cylindrical battery according to claim 1, characterized in that: The first distance is greater than or equal to 0.5 mm and less than or equal to 1 mm; The third distance is greater than or equal to 3 mm and less than or equal to 5 mm.

3. The cylindrical battery according to claim 2, characterized in that: The second distance is greater than or equal to 2 mm and less than or equal to 5 mm; the fourth distance is greater than or equal to 6 mm and less than or equal to 15 mm.

4. The cylindrical battery according to claim 1, characterized in that: In the width direction of the connecting piece, the width of the weld mark is greater than or equal to 0.2 mm and less than or equal to 3 mm; In the length direction of the connecting piece, the length of the weld mark is greater than or equal to 4 mm and less than or equal to 10 mm.

5. The cylindrical battery according to claim 1, characterized in that: The connecting piece further comprises a fixing portion, the fixing portion being located between the welding mark and the second edge, and the fixing portion being configured to allow a fixing device to abut the connecting piece against the inner wall of the housing; The fixing parts are two and are respectively arranged at two sides of the connecting piece along the length direction.

6. The cylindrical battery according to any one of claims 1 to 5, characterized in that: The welding mark includes a plurality of welding lines, each of which extends along the length direction of the connecting piece, and the plurality of welding lines are arranged at intervals along the width direction of the connecting piece.

7. The cylindrical battery according to any one of claims 1 to 5, characterized in that: The welding mark includes a plurality of welding lines, each of which extends along the width direction of the connecting piece, and the plurality of welding lines are arranged at intervals along the length direction of the connecting piece.

8. The cylindrical battery according to claim 6, characterized in that: The distance between any two adjacent welding lines is greater than or equal to 0.05 mm and less than or equal to 0.5 mm.

9. The cylindrical battery according to claim 6, characterized in that: The welding wire is a straight welding wire.

10. An electronic device, characterized in that: A cylindrical battery comprising any one of claims 1 to 9.

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