Current collector, top cover assembly, battery and electric equipment

Abstract

The utility model provides a current collector, a top cover assembly, a battery and electric equipment. The current collector comprises a first section, a second section and a welding part, the first section is used for being electrically connected with a pole; the second section comprises an overflowing part and a connecting part, the overflowing part is connected with the first section, the connecting part is connected to the end, away from the first section, of the overflowing part, the thickness of the connecting part is smaller than that of the overflowing part, the overflowing part comprises an outer side edge and a far side edge, the outer side edge is connected with the first section, and the far side edge is the edge of the side, away from the first section, of the overflowing part; the welding part is used for being welded with the tab and comprises a connecting side edge at least connected with the connecting part, the connecting side edge is located on the inner side of the outer side edge in the width direction of the current collecting piece, and the end, close to the first section, of the connecting side edge is located on the outer side of the far side edge in the width direction of the current collecting piece. According to the invention, the thickness of the over-current part is relatively large, so that the technical problem that the over-current part of the second section is easy to cause a safety accident due to over-high current-carrying temperature rise in the working process can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a current collecting piece, a top cover assembly, a battery and electrical equipment. Background Art

[0002] A battery is a device that converts chemical energy into electrical energy. It usually includes a core pack, a pole and a current collector. The tabs of the core pack are electrically connected to the pole through the current collector, so that the battery can supply power to external electrical equipment through the pole.

[0003] In the prior art, the current collector consists of a first and second connected section. The first section is connected to the terminal post, while the second section has a welded portion for welding to the terminal tab of the core pack. However, the current carrying capacity of the area between the welded portion and the first section is poor, resulting in excessive temperature rise during operation, which can cause safety accidents.

[0004] Therefore, the existing technology needs to be improved and enhanced. Utility Model Content

[0005] The embodiments of the present invention provide a battery current collector, a top cover assembly, a battery and an electrical device, which can improve the technical problem that the second section is prone to excessive current-carrying temperature rise during operation, thereby causing safety accidents.

[0006] In a first aspect, an embodiment of the present invention provides a current collecting member, comprising:

[0007] a first section, the first section being used for electrical connection to the pole;

[0008] a second section, wherein the second section includes a flow-through portion and a connecting portion, the flow-through portion is connected to the first section, the connecting portion is connected to an end of the flow-through portion away from the first section, the thickness of the connecting portion is less than the thickness of the flow-through portion, the flow-through portion includes an outer edge and a distal edge, the outer edge is connected to the first section and extends in a direction close to the connecting portion, and the distal edge is a side edge of the flow-through portion away from the first section; and

[0009] A welding portion, which is connected to the connecting portion and is used for welding to the tab, the welding portion includes a connecting side connected to the second section, the connecting side is at least partially connected to the connecting portion, the connecting side is located on the inner side of the outer edge along the width direction of the current collecting piece, and the end of the connecting side close to the first section is located on the outer side of the distal edge along the width direction of the current collecting piece.

[0010] In some embodiments, a surface of the flow-through portion facing away from the core package protrudes from a surface of the connection portion facing away from the core package, so that a thickness of the connection portion is smaller than a thickness of the flow-through portion.

[0011] In some embodiments, the welding portion is provided with an escape opening at one end close to the first section;

[0012] The welding portion can be bent to fit the connecting portion, so that the end of the flow portion away from the first section is at least partially located in the avoidance opening for avoidance.

[0013] In some embodiments, a step surface is formed between a surface of the flow portion facing away from the core package and a surface of the connection portion facing away from the core package, and an edge of the step surface facing away from the connection portion is inclined toward the first section.

[0014] In some embodiments, a step surface is formed between a surface of the flow portion facing away from the core package and a surface of the connection portion facing away from the core package.

[0015] The step surface includes a first inclined surface and a second inclined surface connected to each other, wherein an end of the first inclined surface facing away from the second inclined surface is inclined toward the direction close to the first section, and an end of the second inclined surface facing away from the first inclined surface is inclined toward the direction close to the first section;

[0016] The second section is connected to the welding portion on each side along the width direction of the current collecting piece, and the welding portion is provided with a weld print area for welding to the tab. The welding portion can be bent to fit the connecting portion so that the connecting portion of the first inclined surface and the second inclined surface is located between the weld print areas on different sides of the second section.

[0017] In some embodiments, a surface of the flow portion facing the core package protrudes from a surface of the connecting portion facing the core package, so that a thickness of the connecting portion is smaller than a thickness of the flow portion;

[0018] Wherein, one end of the connecting side of the welding portion close to the first section is connected to the flow-through portion.

[0019] In some embodiments, the flow-through portion is connected to the first section in a bend.

[0020] In some embodiments, the flow portion is a single-layer structure; or

[0021] The flow portion includes a first layer and a second layer attached to each other, the first section includes a third layer and a fourth layer attached to each other, the first layer is connected to the third layer by a bending, an end of the third layer away from the first layer is connected to an end of the fourth layer away from the first layer by a bending, and the fourth layer is connected to the second layer by a bending; or

[0022] The flow portion includes a first layer and a second layer that are attached to each other. Along the width direction of the current collecting member, a side of the first layer away from the connecting side edge is bent and connected to the second layer.

[0023] In some embodiments, the thickness of the flow-through portion is greater than the thickness of the first section and the connecting portion.

[0024] In some embodiments, the cross-sectional area of the portion of the flow portion between the welding portion and the first section is S1, and the cross-sectional area of the middle portion of the connecting portion is S2; wherein,

[0025] S1 / S2 ≥ 0.8; and / or

[0026] S1 / S2≤3.

[0027] In some embodiments, a bending groove is provided at the connection between the connecting side and the second section, the thickness of the welding portion is t0, the thickness of the bottom wall of the bending groove is t1, and the width of the bending groove along the width direction of the current collecting member is h; wherein,

[0028] 0.2 mm ≤ t0 ≤ 5 mm; and / or

[0029] 0.1 mm ≤ t1 ≤ 0.5 t0; and / or

[0030] t0≤h≤5 mm.

[0031] In a second aspect, an embodiment of the present application further provides a current collecting member, including:

[0032] a first section, the first section being used for electrical connection to the pole;

[0033] a second segment, the second segment being connected to the first segment; and

[0034] a welding portion connected to the second section and used for welding and fixing the tab;

[0035] The second section is further provided with a fuse structure, which is located on a side of the welding portion close to the first section.

[0036] In some embodiments, the fusing threshold of the second section at the fusing structure is 1 2 t≤80MA 2 s; and / or

[0037] The fuse structure is a fuse hole. Along the width direction of the current collecting member, the width of the second section at the fuse hole is W0, and the width of the fuse hole is W1, wherein W0-2>W1≥6 mm.

[0038] In some embodiments, the thickness of the first segment is greater than the thickness of the middle portion of the second segment.

[0039] In some embodiments, the second section includes a flow-through portion and a connecting portion, the flow-through portion is connected to the first section by a bend, the connecting portion is connected to an end of the flow-through portion away from the first section, the thickness of the connecting portion is smaller than the thickness of the flow-through portion, the connecting portion is connected to the welding portion and is provided with the fuse structure.

[0040] In some embodiments, the flow portion includes a first layer and a second layer attached to each other, the first section includes a third layer and a fourth layer attached to each other, the first layer is connected to the third layer in a bending manner, an end of the third layer away from the first layer is connected to an end of the fourth layer away from the first layer in a bending manner, and the fourth layer is connected to the second layer in a bending manner; or,

[0041] The flow portion includes a first layer and a second layer that are bonded to each other, and the first layer is connected to the second layer by a bend along one side of the width direction of the current collecting piece. The first section includes a third layer and a fourth layer that are bonded to each other, and the third layer is connected to the fourth layer by a bend along one side of the width direction of the current collecting piece.

[0042] In some embodiments, a bending groove is provided at the connection between the welding portion and the second section, the thickness of the welding portion is t0, the thickness of the bottom wall of the bending groove is t1, and the width of the bending groove along the width direction of the current collecting member is h; wherein,

[0043] 0.2 mm ≤ t0 ≤ 5 mm; and / or

[0044] 0.1 mm ≤ t1 ≤ 0.5 t0; and / or

[0045] t0≤h≤5 mm.

[0046] In a third aspect, an embodiment of the present application further provides a top cover assembly, comprising:

[0047] Cover body;

[0048] The current collecting member as described in any one of the above items, wherein the current collecting member is mounted on the cover; and

[0049] A pole is mounted on the cover and electrically connected to the first section.

[0050] In a fourth aspect, the present invention also provides a battery comprising

[0051] A housing, wherein the housing is provided with a mounting cavity;

[0052] A core package, the core package being arranged in the installation cavity and provided with a tab; and

[0053] As in the above-mentioned top cover assembly, the cover body is connected and fixed to the shell to close the installation cavity, and the second section is electrically connected to the tab.

[0054] In a fifth aspect, an embodiment of the present application further provides an electrical device comprising the battery as described above.

[0055] Beneficial effects of the embodiments of the present utility model:

[0056] In an embodiment of the present utility model, since the thickness of the overcurrent portion is greater than the thickness of the connecting portion, the current overcurrent capacity of the second section at the overcurrent portion can be improved, that is, the current overcurrent capacity of the second section from the inner side of one end of the welding portion close to the first section to the part between the first section can be improved, and thus the current-carrying temperature rise of the second section during operation can be reduced, thereby improving the technical problem that the second section is prone to excessive current-carrying temperature rise during operation and causing safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0058] Figure 1 This is a schematic structural diagram of the cooperation between the current collecting member, the pole lug and the pole provided in an embodiment of the present utility model.

[0059] Figure 2 for Figure 1 The diagram shows the welding part and the bent tab of the current collector in use.

[0060] Figure 3 for Figure 1 Schematic diagram of the structure of the current collecting part shown.

[0061] Figure 4 for Figure 3 Schematic diagram of the structure in which the welding portion of the current collecting member is bent to fit into the connecting portion.

[0062] Figure 5 This is a schematic structural diagram of a second current collecting member provided in an embodiment of the present utility model.

[0063] Figure 6 for Figure 3 A schematic structural diagram of the current collecting member from another perspective is shown.

[0064] Figure 7 for Figure 6 Cross-sectional view in the AA direction.

[0065] Figure 8 for Figure 6 Cross-sectional view in the BB direction.

[0066] Figure 9 This is a schematic structural diagram of a third current collecting member provided in an embodiment of the present utility model.

[0067] Figure 10 This is a schematic structural diagram of the fourth current collecting member provided by an embodiment of the present utility model in cooperation with the pole lug and pole.

[0068] Figure 11 for Figure 10 Schematic diagram of the structure of the current collecting part shown.

[0069] Figure 12 for Figure 10 A schematic structural diagram of the current collecting member from another perspective is shown.

[0070] Figure 13 A schematic structural diagram of a top cover assembly provided in an embodiment of the present utility model.

[0071] Figure 14 A schematic structural diagram of a battery provided in an embodiment of the present utility model.

[0072] The numbers in the figure are:

[0073] 100. Current collecting parts;

[0074] 11. First section; 111. Third layer; 112. Fourth layer; 113. Pole connection structure; 12. Second section; 121. Current-passing portion; 1211. Step surface; 1211a. First inclined surface; 1211b. Second inclined surface; 1212. First layer; 1213. Second layer; 1214. Outer edge; 1215. Distal edge; 122. Connecting portion; 123. Fuse structure; 13. Welding portion; 131. Connecting side edge; 132. Avoidance opening; 133. Welding mark area; 134. Bending groove; 14. Retaining section;

[0075] 200, pole;

[0076] 300, core package; 31, tab;

[0077] 400, cover;

[0078] 500, housing;

[0079] H1. Width direction of the current collecting piece. DETAILED DESCRIPTION

[0080] The technical solutions in the embodiments of the present application will be described clearly and completely 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 utility model, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; and "inside" and "outside" refer to the outline of the device.

[0081] In addition, in the embodiments of the present application, "plurality" refers to two or more. In view of this, in the embodiments of the present application, "plurality" can also be understood as "at least two". "At least one" can be understood as one or more, for example, one, two, or more. For example, "including at least one" means including one, two, or more, and does not limit which ones are included. For example, "including at least one of A, B, and C" means including A, B, C, A and B, A and C, B and C, or A, B, and C.

[0082] It should be noted that in the embodiments of the present application, "and / or" describes the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / ", unless otherwise specified, generally indicates that the associated objects are in an "or" relationship.

[0083] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a current collector, a tab, and a terminal provided in an embodiment of the present invention. This embodiment of the present application provides a current collector 100. Current collector 100 is used in a battery. Batteries are used in electrical devices, which may include battery-powered game controllers, household appliances, medical devices, and transportation vehicles, among others, though this embodiment of the present application does not limit this.

[0084] The current collecting member 100 includes a first section 11 , a second section 12 and a welding portion 13 .

[0085] The first section 11 is used to be electrically connected to the pole 200. The second section 12 includes a flow-through portion 121 and a connecting portion 122. The flow-through portion 121 is connected to the first section 11. The connecting portion 122 is connected to one end of the flow-through portion 121 that faces away from the first section 11. The thickness of the connecting portion 122 is less than the thickness of the flow-through portion 121, thereby improving the current flow-through capacity of the flow-through portion 121. The welding portion 13 is connected to the connecting portion 122 and is used to be welded and fixed to the pole lug 31. The welding portion 13 includes a connecting side 131 connected to the second section 12, the connecting side 131 is at least partially connected to the connecting portion 122, and the end of the connecting side 131 close to the first section 11 is located on the outside of the flow-through portion 121 along the width direction H1 of the current collector 100.

[0086] Therefore, since the thickness of the overcurrent portion 121 is greater than the thickness of the connecting portion 122, the current overcurrent capacity of the second section 12 at the overcurrent portion 121 can be improved, that is, the current overcurrent capacity of the second section 12 from the inner side of one end of the welding portion 13 close to the first section 11 to the part between the first section 11 can be improved, thereby reducing the current-carrying temperature rise of the second section 12 during operation, thereby improving the technical problem that the second section 12 is prone to excessive current-carrying temperature rise during operation and causing safety accidents.

[0087] Please refer to Figure 1 and Figure 4 ,, Figure 4 for Figure 3 Schematic diagram of the structure in which the welding portion of the current collecting part is bent to fit the connecting portion. In some embodiments, the flow portion 121 includes an outer edge 1214 and a distal edge 1215. The outer edge 1214 is connected to the first section 11 and extends in a direction close to the connecting portion 122. The distal edge 1215 is a side edge of the flow portion 121 away from the first section 11. The connecting side 131 is located on the inner side of the outer edge 1214 along the width direction H1 of the current collecting part 100, and the end of the connecting side 131 close to the first section 11 is located on the outer side of the distal edge 1215 along the width direction H1 of the current collecting part 100. Thereby, the current flow capacity of the second section 12 from the inner side of the end of the welding portion 13 close to the first section 11 to the first section 11 can be improved.

[0088] In some embodiments, the current-passing portion 121 is connected to the first section 11 in a curved manner. For example, the current-passing portion 121 is connected to the first section 11 vertically. Therefore, in actual use, the first section 11 may be disposed on the top surface of the core package for connection to the electrode 200, while the second section 12 may be disposed on the side of the core package to enable the welding portion 13 to be welded to the electrode tab 31 on the side of the core package.

[0089] The above is an overall description of the technical solution of the embodiment of the present application. The following will continue to illustrate the technical solution of the embodiment of the present application with examples in combination with the structure of the overflow portion 121.

[0090] Please refer to Figure 1 and Figure 2 , Figure 2 for Figure 1 The side of the flow portion 121 facing away from the core package 300 is protruding from the side of the connecting portion 122 facing away from the core package 300, so that the thickness of the connecting portion 122 is smaller than that of the flow portion 121.

[0091] Therefore, on the one hand, it can be understood that the side of the second section 12 facing away from the core package 300 forms a recessed space at the connection portion 122. On the other hand, after being welded and fixed to the tab 31 of the core package 300, the welding portion 13 generally needs to be bent to fit the side of the second section 12 facing away from the core package 300, so as to prevent the second section 12 from occupying too much space inside the battery. Then, the welding portion 13 can be bent into this recessed space to fit the side of the connection portion 122 facing away from the core package 300, thereby fully utilizing the space on the side of the second section 12 facing away from the core package 300, so that the current collector 100 occupies less space inside the battery, ultimately improving the battery's energy density.

[0092] Please continue to refer to Figure 3 and Figure 4 , Figure 3 for Figure 1 Schematic diagram of the structure of the current collecting member shown. In some embodiments, a avoidance opening 132 is provided at one end of the welding portion 13 close to the first section 11. The welding portion 13 can be bent to fit against the connecting portion 122, so that the end of the flow portion 121 away from the first section 11 is at least partially located in the avoidance opening 132 for avoidance. Furthermore, the avoidance opening 132 can prevent the welding portion 13 from being bent and fitted to the flow portion 121, thereby preventing the thickness of the current collecting member 100 at the flow portion 121 from being too large, and also prevent the portion of the welding portion 13 located at the junction of the flow portion 121 and the connecting portion 122 from being squeezed by the flow portion 121 and deformed, damaged, etc.

[0093] In some embodiments, a step surface 1211 is formed between the side surface of the flow portion 121 facing away from the core package 300 and the side surface of the connecting portion 122 facing away from the core package 300, and the side edge of the step surface 1211 facing away from the connecting portion 122 is inclined toward the first section 11.

[0094] Therefore, compared to the step surface 1211 being vertically connected to the connection portion 122, it can be understood that the straight edge formed at the connection between the step surface 1211 and the surface of the side of the flow portion 121 facing away from the core package 300 in the embodiment of the present application is offset in the direction away from the connection portion 122. Therefore, even if the welding portion 13 is offset to a certain extent during the process of being bent to fit the connection portion 122, it is not easily squeezed and damaged by the straight edge.

[0095] In some embodiments, a stepped surface 1211 is formed between a surface of the flow portion 121 facing away from the core package 300 and a surface of the connection portion 122 facing away from the core package 300. The stepped surface 1211 may include a first inclined surface 1211a and a second inclined surface 1211b connected to each other, wherein an end of the first inclined surface 1211a facing away from the second inclined surface 1211b is inclined toward the first section 11, and an end of the second inclined surface 1211b facing away from the first inclined surface 1211a is inclined toward the first section 11.

[0096] The second section 12 is connected to each side of the current collector 100 along the width direction H1 with a welding portion 13. The welding portion 13 has a weld imprint area 133 for welding to the tab 31. The welding portion 13 can be bent to fit against the connecting portion 122, so that the connecting portion 122 of the first inclined surface 1211a and the second inclined surface 1211b are located between the weld imprint areas 133 on different sides of the second section 12.

[0097] Therefore, when the overall length of the welding portion 13 remains unchanged, the welding mark area 133 can be made larger compared to the welding mark area 133 located on the side of the step surface 1211 away from the first section 11, thereby ensuring the reliability of welding the welding portion 13 and the tab 31.

[0098] Optionally, the step surface 1211 may also be a flat surface, and the weld mark area 133 of the welding portion 13 may be located on the side of the step surface 1211 away from the second section 12 , which is not limited in this embodiment of the present application.

[0099] The above are some examples of the embodiment of the present application in which the surface of the flow portion 121 facing away from the core package 300 protrudes beyond the surface of the connecting portion 122 facing away from the core package 300 .

[0100] Please continue to refer to Figure 5 , Figure 5 Schematic diagram of the structure of the second current collecting member provided in an embodiment of the present invention. In some embodiments, the surface of the flow portion 121 facing the core package 300 protrudes from the surface of the connecting portion 122 facing the core package 300, so that the thickness of the connecting portion 122 is less than the thickness of the flow portion 121.

[0101] Then, when the surface of the side of the flow portion 121 facing away from the core package 300 is flush with the surface of the side of the connecting portion 122 facing away from the core package 300, the flow portion 121 can be made thicker and the surface of the side of the flow portion 121 facing away from the core package 300 can be prevented from bulging outward and interfering with the bending of the welding portion 13 to fit the surface of the side of the second section 12 facing away from the core package 300. Of course, in some embodiments, the surface of the flow portion 121 facing the core package 300 can also bulge out from the surface of the side of the connecting portion 122 facing the core package 300, and at the same time, the surface of the flow portion 121 facing away from the core package 300 can also bulge out from the surface of the side of the connecting portion 122 facing away from the core package 300, so that the thickness of the connecting portion 122 is less than the thickness of the flow portion 121. This embodiment of the present application does not limit this.

[0102] In some embodiments, the connecting side 131 of the welding portion 13 is connected to the flow portion 121 near one end of the first section 11, so that the connecting side 131 of the welding portion 13 is located on the outside of the flow portion 121 along the width direction H1 of the current collecting member 100, thereby ensuring that the current flow capacity of the area of the second section 12 located on the inner side of one end of the welding portion 13 near the first section 11 can also be improved.

[0103] Next, the technical solution of the embodiment of the present application will be described with examples in combination with the thickness parameters of the flow-through portion 121 .

[0104] Please continue to refer to Figures 6 to 8 , Figure 6 for Figure 3 The structural diagram of the current collecting piece from another perspective is shown. Figure 7 for Figure 6 Cross-sectional view in the AA direction, Figure 8 for Figure 6 Cross-sectional view along the middle BB direction. The cross-sectional area of the portion of the flow portion 121 between the welding portion 13 and the first section 11 is S1, and the cross-sectional area of the middle portion of the connecting portion 122 is S2. Where, S1 / S2 ≥ 0.8, and / or S1 / S2 ≤ 3.

[0105] It can be understood that, in actual use, the width direction H1 of the current collecting part 100 is also the width direction of the overcurrent portion 121 and the connecting portion 22, wherein the width of some areas of the overcurrent portion 121 may be slightly narrower than the width of the middle part of the connecting portion 122. Therefore, by S1 / S2≥0.8, it can be ensured that the cross-sectional area of the overcurrent portion 121 is large enough, so that the overcurrent portion 121 has sufficient current passing capacity.

[0106] In addition, by setting S1 / S2≤3, it is possible to avoid the overflow portion 121 being too thick, which would cause the overall thickness of the current collecting member 100 to increase and waste too much space inside the battery, thereby effectively ensuring the energy density of the battery.

[0107] Illustratively, S1 / S2 (i.e., the ratio of S1 to S2) can be 0.8, 0.876, 0.95, 0.996, 1, 1.04, 1.15, 1.37, 1.5, 1.76, 2, 2.05, 2.3, 2.54, 2.76, 2.81, 2.9, 2.95 or 3, which is not limited in the implementation of this application.

[0108] Of course, in some implementations, 1.5≤S1 / S2≤3 may also be satisfied, and this embodiment of the present application does not limit this.

[0109] Next, the technical solution of the embodiment of the present application will be described with examples in combination with the formation method of the flow portion 121 .

[0110] In some embodiments, the flow portion 121 may be a single-layer structure.

[0111] For example, a portion of the second section 12 may be thinned by a stamping process to form the connecting portion 122 ; correspondingly, the flow portion 121 may be formed by at least a portion of the second section 12 that is not thinned.

[0112] Optional, please continue to refer to Figure 9 , Figure 9 This is a schematic diagram of the structure of a third current collecting member provided by an embodiment of the present invention. The flow portion 121 includes a first layer 1212 and a second layer 1213 that are bonded to each other. The first layer 1212 and the second layer 1213 are bent and connected, thereby being able to be bent and formed using a sheet metal bending process.

[0113] In some embodiments, along the width direction H1 of the current collecting member 100 , the side of the first layer 1212 away from the connecting side 131 is bent and connected to the second layer 1213 . That is, the first layer 1212 or the second layer 1213 can be bent from one side of the width direction H1 of the current collecting member 100 .

[0114] In some embodiments, the first section 11 includes a third layer 111 and a fourth layer 112 that are bonded to each other. The first layer 1212 is connected to the third layer 111 by a bend, and an end of the third layer 111 away from the first layer 1212 is connected to an end of the fourth layer 112 away from the first layer 1212 by a bend. The fourth layer 112 is connected to the second layer 1213 by a bend.

[0115] Then, continuing with the example of the current collecting part 100 being a sheet metal part, the first section, the second section, the third section and the fourth section connected in sequence along the length direction can be punched out first; then, the second section and the third section are bent 180° at the connection point, so that the first section and the fourth section are fitted together, and the second section and the third section are fitted together; then, the first section and the second section are bent 90° at the connection point, so that the first section, the second section, the third section and the fourth section are formed in sequence, the first layer 1212, the third layer 111, the fourth layer 112 and the second layer 1213.

[0116] The above are some examples of the formation of the flow portion 121 in the embodiment of the present application.

[0117] like Figure 8 As shown, a bending groove 134 is provided at the connection between the side edge 131 and the second section 12 , so that the welding portion 13 can be bent at the bending groove 134 to fit the second section 12 .

[0118] In some embodiments, the thickness of the weld 13 is t0.0.2 mm ≤ t0 ≤ 5 mm. This prevents the weld 13 from being too thin, which would result in insufficient current flow capacity, while also preventing the weld 13 from being too thick, which would result in the weld 13 occupying too much space inside the battery, thereby improving the battery's energy density.

[0119] Illustratively, t0 may be 0.2 mm, 0.24 mm, 0.25 mm, 0.297 mm, 0.3 mm, 0.3164 mm, 0.391 mm, 0.4 mm, 0.42 mm, 0.45 mm, 0.47 mm, 0.49 mm or 0.5 mm, which is not limited in the implementation of this application.

[0120] In some embodiments, the thickness of the bottom wall of the bending groove 134 is t1. 0.1 mm ≤ t1 ≤ 0.5t0, thereby preventing the wall thickness at the bending groove 134 from being too thin, resulting in insufficient current flow capacity, and preventing the wall thickness at the bending groove 134 from being too thick, resulting in the welding portion 13 being difficult to bend to fit the second section 12.

[0121] Illustratively, t1 may be 0.1 mm, 0.12 mm, 0.13 mm, 0.139 mm, 0.145 mm, 0.15 mm, 0.192 mm, 0.2 mm, 0.24 mm or 0.25 mm, which is not limited in the present application.

[0122] In some embodiments, the width of the bending groove 134 along the width direction H1 of the current collecting member 100 is h, where t0≤h≤5 mm. This can prevent the bending groove 134 from being too narrow, making it difficult to machine, and the bending groove 134 from being too wide, resulting in insufficient connection strength between the weld portion 13 and the second segment 12.

[0123] Illustratively, h can be 0.2 mm, 0.34 mm, 0.4 mm, 0.5 mm, 0.83 mm, 1 mm, 1.391 mm, 1.5 mm, 1.87 mm, 2 mm, 2.5 mm, 2.9 mm, 3 mm, 3.3 mm, 3.4 mm, 3.79 mm, 4 mm, 4.2 mm, 4.3 mm, 4.5 mm or 5 mm, which is not limited in the implementation of this application.

[0124] Next, the technical solution of the embodiment of the present application will be described with examples in combination with the structure of the welding portion 13 .

[0125] The number of the welding parts 13 may be one; the number of the welding parts 13 may also be at least two, such as two, three, four or even five, which is not limited in the embodiment of the present application.

[0126] For example, when the number of welding parts 13 is one, the connecting side 131 of the welding part 13 may be connected to one side edge of the second section 12 along the width direction H1 of the current collecting part 100, and the one side edge of the welding part 13 away from the connecting side 131 is adjacent to the other side edge of the second section 12 along the width direction H1 of the current collecting part 100.

[0127] Optionally, when there are two welding portions 13 , each side edge of the second segment 12 along the width direction H1 of the current collecting member 100 may be connected to a connecting side edge 131 of one welding portion 13 .

[0128] Next, the technical solution of the embodiment of the present application will be described with examples in conjunction with the structure of the first paragraph 11.

[0129] like Figure 9 As shown, the first section 11 is provided with a pole connection structure 113 for electrically connecting to the pole 200 , thereby achieving electrical connection between the first section 11 and the pole 200 .

[0130] For example, the pole connection structure 113 may include a pole mounting hole, which is used to mount the pole 200 to electrically connect with the pole 200. Furthermore, during the assembly process, the pole 200 may be inserted into the pole mounting hole for installation.

[0131] In some embodiments, the thickness of the first segment 11 may be greater than the thickness of the connecting portion 122 , thereby improving the current flow capacity of the first segment 11 .

[0132] For example, as mentioned above, the first section 11 may include a third layer 111 and a fourth layer 112 that are bonded to each other, so that the thickness of the first section 11 is greater than the thickness of the connecting portion 122 through the at least two-layer structure. Accordingly, the pole mounting hole may penetrate the third layer 111 and the fourth layer 112.

[0133] Of course, in some other embodiments, the third layer 111 may be bent and connected to the fourth layer 112 along one side of the width direction H1 of the current collecting member 100 , and this embodiment of the present application does not limit this.

[0134] It can also be understood that in some other embodiments, the pole mounting hole may also be a blind hole, which is not limited in the embodiment of the present application.

[0135] In some embodiments, the thickness of the first section 11 may be less than or equal to the thickness of the flow-through portion 121 .

[0136] In some embodiments, the first segment 11 may further include a positioning hole (not shown). The positioning hole is located between the terminal connection structure 113 and the second segment 12. Accordingly, other structures within the battery (such as the cover, which will be explained later) may be provided with positioning posts that engage with the positioning holes. The engagement of the positioning holes with the positioning posts can restrict the rotation or movement of the current collector 100 relative to the battery cover.

[0137] In some embodiments, the current collecting member 100 further includes a retaining section 14 , which protrudes from an end of the second section 12 away from the first section 11 , so as to be clamped and fixed by an external instrument.

[0138] Furthermore, after the welding portion 13 and the tab 31 are welded, the holding section 14 can be clamped by an external instrument, and then the tab 31 and the welding portion 13 can be bent externally until the entire assembly is folded onto the second section 12. Furthermore, the provision of the holding section 14 can improve the bending accuracy of the welding portion 13 and the tab 31. Furthermore, the force applied to the current collector 100 during the bending of the welding portion 13 and the tab 31 can be transferred to the external instrument, thereby preventing the current collector 100 from crushing the core package 300.

[0139] Please continue to refer to Figure 10 , Figure 10This is a schematic diagram of the structure of the fourth current collector provided by an embodiment of the present invention in cooperation with the pole tab and pole. The embodiment of the present application also provides a current collector 100, including a first section 11, a second section 12 and a welding portion 13. The first section 11 is used to electrically connect to the pole 200. The second section 12 is connected to the first section 11. The welding portion 13 is connected to the second section 12 and is used to be welded and fixed to the pole tab 31. Among them, the second section 12 is also provided with a fuse structure 123, and the fuse structure 123 is located on the side of the welding portion 13 close to the first section 11.

[0140] Therefore, when the current-carrying temperature rise of the part of the second section 12 located between the welding portion 13 and the first section 11 is too high, the second section 12 can be fused at the fuse structure 123, thereby improving the technical problem that the second section 12 is prone to excessive current-carrying temperature rise during operation and causing safety accidents.

[0141] In some embodiments, the fusing threshold of the second section 12 at the fusing structure 123 is 1 2 t≤80MA 2 s, so that the second section 12 can be fused in time before the current-carrying temperature rises too high, so as to improve the technical problem that the second section 12 temperature is too high and the battery is prone to fire.

[0142] In some embodiments, the fuse structure 123 is a fuse hole, so that the cross-sectional area of the fuse structure 123 can be reduced by the fuse hole, so that the second section 12 can be fused in time at the fuse hole when the current carrying temperature rises high.

[0143] For example, the fuse hole may be located in the middle of the second section 12 along the width direction H1 of the current collector 100. Of course, the fuse hole may also be offset along one side of the width direction H1 of the current collector 100, which is not limited in this embodiment of the application.

[0144] Please continue to refer to Figure 11 , Figure 11 for Figure 10 The schematic diagram of the current collector structure is shown. In some embodiments, along the width direction H1 of the current collector 100, the width of the second segment 12 at the fuse hole is W0, and the width of the fuse hole is W1, where W0-2>W1≥6 mm. Thus, a sufficiently large fuse hole ensures that the second segment 12 fuses before the current-carrying temperature rises excessively, thereby alleviating the technical problem of the second segment 12 overheating and causing battery fires. This also prevents an overly large fuse hole from reducing the current carrying capacity of the second segment 12 and ultimately affecting battery performance.

[0145] Please continue to refer to Figure 12 , Figure 12 for Figure 10In some embodiments, the thickness of the first section 11 is greater than the thickness of the middle portion of the second section 12 , thereby improving the current flow capacity of the first section 11 .

[0146] In some embodiments, the first section 11 may be a single-layer structure.

[0147] Optionally, the first section 11 may also include a third layer 111 and a fourth layer 112 that are bonded to each other, thereby increasing the thickness of the first section 11 through the multi-layer structure.

[0148] In some embodiments, the first section 11 is provided with a pole connection structure 113 for electrically connecting to the pole 200 , thereby achieving electrical connection between the first section 11 and the pole 200 .

[0149] For example, the pole connection structure 113 may include a pole mounting hole, which is used to mount the pole 200 to electrically connect with the pole 200. Furthermore, during the assembly process, the pole 200 may be inserted into the pole mounting hole for installation.

[0150] Then, the pole mounting hole may pass through the third layer 111 and the fourth layer 112. Of course, the pole mounting hole may also be a blind hole, which is not limited in the embodiment of the present application.

[0151] In some embodiments, the second segment 12 includes a flow-through portion 121 and a connecting portion 122. The flow-through portion 121 is connected to the first segment 11 by a bend, and the connecting portion 122 is connected to the end of the flow-through portion 121 facing away from the first segment 11. The connecting portion 122 is thinner than the flow-through portion 121. The connecting portion 122 is connected to the welding portion 13 and is provided with a fuse structure 123. As a result, the thickness of the portion of the second segment 12 located between the fuse structure 123 and the first segment 11 can be greater, thereby improving the structural strength and current-passing capacity of this portion of the second segment 12.

[0152] Exemplarily, the flow portion 121 includes a first layer 1212 and a second layer 1213 that are bonded to each other. The first layer 1212 is connected to the third layer 111 by a bend, and an end of the third layer 111 away from the first layer 1212 is connected to an end of the fourth layer 112 away from the first layer 1212 by a bend. The fourth layer 112 is connected to the second layer 1213 by a bend.

[0153] Then, taking the current collecting part 100 as a sheet metal part as an example, the first section, the second section, the third section and the fourth section connected in sequence along the length direction can be punched out first; then, the second section and the third section are bent 180° at the connection point, so that the first section and the fourth section are fitted together, and the second section and the third section are fitted together; then, the first section and the second section are bent 90° at the connection point, so that the first section, the second section, the third section and the fourth section are formed in sequence, the first layer 1212, the third layer 111, the fourth layer 112 and the second layer 1213.

[0154] In some other embodiments, the flow portion 121 includes a first layer 1212 and a second layer 1213 that are bonded to each other, and the first layer 1212 is bent and connected to the second layer 1213 on one side along the width direction H1 of the current collecting member 100, so that the thickness of the flow portion 121 is greater than the thickness of the connecting portion 122 through the double structure.

[0155] In some embodiments, a bending groove 134 may be provided at the connection between the welding portion 13 and the second section 12 . The specific structure of the bending groove 134 may refer to the bending groove 134 described above, and will not be described in detail in the embodiment of the present application.

[0156] In some embodiments, the current collecting member 100 may further include a retaining section 14 . The specific structure of the retaining section 14 may refer to the retaining section 14 described above, and will not be further described in the embodiments of the present application.

[0157] The above are some examples of the current collecting member 100 according to the embodiment of the present application.

[0158] Please continue to refer to Figure 13 , Figure 13 A schematic diagram of the structure of a top cover assembly according to an embodiment of the present invention. The top cover assembly may include a cover 400, a current collector 100, and a terminal 200. The current collector 100 is as described above. The current collector 100 is mounted on the cover 400. The terminal 200 is mounted on the cover 400 and electrically connected to the first section 11.

[0159] The above are some examples of the top cover assembly of the embodiment of the present application.

[0160] Please continue to refer to Figure 14 , Figure 14 This is a schematic diagram of the structure of a battery provided in an embodiment of the present invention. This embodiment of the present application also provides a top cover assembly. This embodiment of the present application also provides a battery, which may include the top cover assembly as described above.

[0161] Exemplarily, a battery may include a housing 500, a core pack 300, and a top cap assembly. The housing 500 defines a mounting cavity, within which the core pack 300 is disposed. The core pack 300 is provided with a tab 31. The cover 400 of the top cap assembly is connected to the housing 500 to enclose the mounting cavity. The second section 12 of the current collector 100 of the top cap assembly is electrically connected to the tab 31 of the core pack 300. This allows the top cap assembly to supply power to external devices via the pole 200.

[0162] In some embodiments, the battery may further include an insulating film (not shown in the figure), which wraps the second section 12 and the core package 300 to insulate the shell 500 from the second section 12 and the core package 300, respectively, thereby reducing the risk of internal short circuit in the battery.

[0163] The above are some examples of the batteries according to the embodiments of the present application.

[0164] An embodiment of the present application further provides an electrical device, which may include the battery as described above.

[0165] Electrical equipment may be, but is not limited to, vehicles, smart wearable devices, mobile terminals, household appliances, and medical devices, and the embodiments of this application do not limit this. Vehicles include, but are not limited to, cars, buses, trains, ships, aircraft equipment, and the like. Smart wearable devices include, but are not limited to, smart watches, smart bracelets, cervical massagers, and the like. Mobile terminals include, but are not limited to, smartphones, laptops, tablets, and POS (point of sales terminals). Household appliances include, but are not limited to, televisions, washing machines, air conditioners, rice cookers, smart sweepers, smart lights, and the like. Medical devices include, but are not limited to, infrared electronic thermometers, pulse oximeters, body composition analyzers, and the like.

[0166] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of the present invention. At the same time, for those skilled in the art, based on the idea of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A current collecting member, characterized in that: include: a first section, the first section being used for electrical connection to the pole; a second section, wherein the second section includes a flow-through portion and a connecting portion, the flow-through portion being connected to the first section, the connecting portion being connected to an end of the flow-through portion facing away from the first section, the connecting portion having a thickness smaller than that of the flow-through portion, the flow-through portion including an outer edge and a distal edge, the outer edge being connected to the first section and extending in a direction close to the connecting portion, and the distal edge being an edge of a side of the flow-through portion facing away from the first section; and A welding portion, which is connected to the connecting portion and is used for welding to the tab, the welding portion includes a connecting side connected to the second section, the connecting side is at least partially connected to the connecting portion, the connecting side is located on the inner side of the outer edge along the width direction of the current collecting piece, and the end of the connecting side close to the first section is located on the outer side of the distal edge along the width direction of the current collecting piece.

2. The current collecting member according to claim 1, characterized in that: A surface of the flow portion facing away from the core package protrudes from a surface of the connection portion facing away from the core package, so that a thickness of the connection portion is smaller than a thickness of the flow portion.

3. The current collecting member according to claim 2, characterized in that: The welding portion is provided with a relief opening at one end close to the first section; The welding portion can be bent to fit the connecting portion, so that the end of the flow portion away from the first section is at least partially located in the avoidance opening for avoidance.

4. The current collecting member according to claim 2, characterized in that: A step surface is formed between a surface of the flow portion facing away from the core package and a surface of the connection portion facing away from the core package. An edge of the step surface facing away from the connection portion is inclined toward the first section.

5. The current collecting member according to claim 2, characterized in that: A step surface is formed between a surface of the flow portion facing away from the core package and a surface of the connection portion facing away from the core package; The step surface includes a first inclined surface and a second inclined surface connected to each other, wherein an end of the first inclined surface facing away from the second inclined surface is inclined toward the direction close to the first section, and an end of the second inclined surface facing away from the first inclined surface is inclined toward the direction close to the first section; The second section is connected to the welding portion on each side along the width direction of the current collecting piece, and the welding portion is provided with a weld print area for welding to the tab. The welding portion can be bent to fit the connecting portion so that the connecting portion of the first inclined surface and the second inclined surface is located between the weld print areas on different sides of the second section.

6. The current collecting member according to claim 1, characterized in that: A surface of the flow portion facing the core package protrudes from a surface of the connecting portion facing the core package, so that a thickness of the connecting portion is smaller than a thickness of the flow portion; Wherein, one end of the connecting side of the welding portion close to the first section is connected to the flow-through portion.

7. The current collecting member according to claim 1, characterized in that: The flow-through portion is connected to the first section in a bend.

8. The current collecting member according to any one of claims 1 to 7, characterized in that: The flow passage is a single-layer structure; or The flow portion includes a first layer and a second layer attached to each other, the first section includes a third layer and a fourth layer attached to each other, the first layer is connected to the third layer by a bending, an end of the third layer away from the first layer is connected to an end of the fourth layer away from the first layer by a bending, and the fourth layer is connected to the second layer by a bending; or The flow portion includes a first layer and a second layer that are attached to each other. Along the width direction of the current collecting member, a side of the first layer away from the connecting side edge is bent and connected to the second layer.

9. The current collecting member according to claim 8, characterized in that: The thickness of the flow-through portion is greater than the thickness of the first section and the connecting portion.

10. The current collecting member according to any one of claims 1 to 7, characterized in that: The cross-sectional area of the portion of the flow portion between the welding portion and the first section is S1, and the cross-sectional area of the middle portion of the connecting portion is S2; wherein, S1 / S2 ≥ 0.8; and / or S1 / S2≤3.

11. The current collecting member according to any one of claims 1 to 7, characterized in that: A bending groove is provided at the connection between the connecting side and the second section, the thickness of the welding portion is t0, the thickness of the bottom wall of the bending groove is t1, and the width of the bending groove along the width direction of the current collecting member is h; wherein, 0.2 mm ≤ t0 ≤ 5 mm; and / or 0.1 mm ≤ t1 ≤ 0.5 t0; and / or t0≤h≤5 mm.

12. A current collecting member, characterized in that: include: a first section, the first section being used for electrical connection to the pole; a second segment, the second segment being connected to the first segment; and a welding portion connected to the second section and used for welding and fixing the tab; The second section is further provided with a fuse structure, which is located on a side of the welding portion close to the first section.

13. The current collecting member according to claim 12, characterized in that: The second section has a melting threshold of I at the melting structure. 2 t≤80MA 2 s; and / or The fuse structure is a fuse hole. Along the width direction of the current collecting member, the width of the second section at the fuse hole is W0, and the width of the fuse hole is W1, wherein W0-2>W1≥6 mm.

14. The current collecting member according to claim 12 or 13, characterized in that: The thickness of the first section is greater than the thickness of the middle portion of the second section.

15. The current collecting member according to claim 14, characterized in that: The second section includes a flow-through portion and a connecting portion. The flow-through portion is connected to the first section by a bend. The connecting portion is connected to one end of the flow-through portion away from the first section. The thickness of the connecting portion is smaller than the thickness of the flow-through portion. The connecting portion is connected to the welding portion and is provided with the fuse structure.

16. The current collecting member according to claim 15, characterized in that: The flow portion includes a first layer and a second layer attached to each other, the first section includes a third layer and a fourth layer attached to each other, the first layer is connected to the third layer in a bending manner, an end of the third layer away from the first layer is connected to an end of the fourth layer away from the first layer in a bending manner, and the fourth layer is connected to the second layer in a bending manner; or The flow portion includes a first layer and a second layer that are bonded to each other, and the first layer is connected to the second layer by a bend along one side of the width direction of the current collecting piece. The first section includes a third layer and a fourth layer that are bonded to each other, and the third layer is connected to the fourth layer by a bend along one side of the width direction of the current collecting piece.

17. The current collecting member according to claim 12 or 13, characterized in that: A bending groove is provided at the connection between the welding portion and the second section, the thickness of the welding portion is t0, the thickness of the bottom wall of the bending groove is t1, and the width of the bending groove along the width direction of the current collecting member is h; wherein, 0.2 mm ≤ t0 ≤ 5 mm; and / or 0.1 mm ≤ t1 ≤ 0.5 t0; and / or t0≤h≤5 mm.

18. A top cover assembly, characterized in that: include: Cover body; The current collecting member according to any one of claims 1 to 17, wherein the current collecting member is mounted on the cover; and A pole is mounted on the cover and electrically connected to the first section.

19. A battery, characterized in that: include A housing, wherein the housing is provided with a mounting cavity; A core package, the core package being arranged in the installation cavity and provided with a tab; and The top cover assembly as described in claim 18, wherein the cover body is connected and fixed to the shell to close the installation cavity, and the second section is electrically connected to the tab.

20. An electrical device, characterized in that: Comprising the battery of claim 19.

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