Battery cell, battery, battery module, battery pack and power utilization device

Abstract

The utility model discloses a battery cell, a battery, a battery module, a battery pack and an electric device, the battery cell comprises a pole core, a first collector plate and a second collector plate, and one end of the pole core is provided with a first tab and a second tab; the first current collecting plate is arranged at one end of the pole core, and the first current collecting plate is connected with the first pole lug; the second current collecting plate is arranged at one end of the pole core, the second current collecting plate is connected with the second pole lug, and at least one of the second current collecting plate and the first current collecting plate is a single-layer structural part. According to the battery cell disclosed by the utility model, the structural impedance of the battery cell is reduced, the normal use of the battery cell is facilitated, and the utilization rate of the internal space of the battery cell is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicles, and in particular to a battery cell, a battery, a battery module, a battery pack and an electric device. Background Art

[0002] As the core component of power batteries, battery cells play a significant role in power batteries. For power batteries, battery cells determine the quality of power battery products, and of course, they also affect the battery life and capacity of the vehicle.

[0003] In the related art, the battery cell includes a tab and a current collecting plate, and the tab is connected to the current collecting plate to facilitate the smooth flow of current from the tab. Generally, the current collecting plate has a complex structure and a long current flow path, which makes the impedance of the battery cell high and is not convenient for normal use of the battery cell. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a battery cell that reduces the structural impedance of the battery cell, facilitates the normal use of the battery cell, and improves the utilization rate of the internal space of the battery cell.

[0005] The second purpose of the utility model is to provide a battery using the above-mentioned battery cell.

[0006] The third object of the present invention is to provide a battery module using the above-mentioned battery.

[0007] The fourth objective of the present invention is to provide a battery pack using the above-mentioned battery or battery module.

[0008] The fifth objective of the present utility model is to provide an electrical device using the above-mentioned battery pack.

[0009] According to the first aspect of the utility model, the battery cell includes: a pole core, one end of which is provided with a first pole ear and a second pole ear; a first current collecting disk, the first current collecting disk is arranged at the one end of the pole core, and the first current collecting disk is connected to the first pole ear; a second current collecting disk, the second current collecting disk is arranged at the one end of the pole core, and the second current collecting disk is connected to the second pole ear, and at least one of the second current collecting disk and the first current collecting disk is a single-layer structural component.

[0010] According to the battery cell of the utility model, by setting at least one of the second current collecting disk and the first current collecting disk as a single-layer structural member, the current carrying energy of the first pole ear or the second pole ear can directly pass through the second current collecting disk or the first current collecting disk along the thickness direction of the first current collecting disk or the second current collecting disk, respectively, thereby reducing the structural impedance of the battery cell, facilitating the normal use of the battery cell, and improving the performance of the battery cell. In addition, the single-layer structure has a simple structure and uses less material, thereby reducing the production cost of the battery cell. In addition, the battery cell is led out on the same side, thereby improving the space utilization rate in the battery cell.

[0011] According to some embodiments of the present invention, the first current collecting disk is located on a side of the first pole lug away from the pole core, and the second current collecting disk is located on a side of the second pole lug away from the pole core.

[0012] According to some embodiments of the present invention, the second current collecting disc includes: a first connecting portion, through which the second current collecting disc is connected to the second pole ear; a second connecting portion, which is arranged on a side of the first connecting portion away from the second pole ear; and a third connecting portion, which is connected to a side of the second connecting portion away from the first connecting portion.

[0013] According to some embodiments of the present invention, the first connection portion and the third connection portion both extend in a direction perpendicular to the central axis of the pole core, and the second connection portion is vertically connected between the first connection portion and the third connection portion.

[0014] According to some embodiments of the utility model, the first connection part includes two first sub-connection parts arranged at intervals, each of the first sub-connection parts includes a first side and a second side, the first side and the second side are not on the same plane, the first sides of the two first sub-connection parts are opposite to each other, and the second sides of the two first sub-connection parts are located on the same straight line; the second connection part includes two second sub-connection parts arranged at intervals, one side of one of the second sub-connection parts is connected to the first side and the second side of one of the first sub-connection parts, and one side of the other second sub-connection part is connected to the first side and the second side of the other first sub-connection part; the third connection part includes a third sub-connection part and a fourth sub-connection part, the third sub-connection part is connected between the other side of the two second sub-connection parts opposite to the first side of the two first sub-connection parts, one side of the fourth sub-connection part is connected to the other side of the two second sub-connection parts opposite to the second side of the two first sub-connection parts and the third sub-connection part, and the other side of the fourth sub-connection part extends in a direction away from the first connection part.

[0015] According to some embodiments of the present invention, the first side edge and the second side edge are perpendicular to each other.

[0016] According to some embodiments of the present invention, the second current collecting plate is symmetrically arranged with respect to the extension direction of the third sub-connecting portion.

[0017] According to some embodiments of the present invention, the minimum distance between the first connecting portion and the central axis of the pole core is d1, wherein d1 satisfies: 2mm≤d1≤7.7mm.

[0018] According to some embodiments of the present invention, the first connection portion is located radially inward of the outer periphery of the pole core, and the distance between the first connection portion and the outer periphery of the pole core is d2, wherein d2 satisfies: 0.5mm≤d2≤2mm.

[0019] According to some embodiments of the present invention, the second current collecting plate is a negative electrode current collecting plate, and the second current collecting plate is a stamped part made of steel or copper.

[0020] According to some embodiments of the present invention, a connection protrusion is provided on a surface of one side of the first current collecting disk adjacent to the first pole lug, and the first current collecting disk is connected to the first pole lug via the connection protrusion.

[0021] According to some embodiments of the present invention, the connecting protrusion includes a first protrusion portion and a second protrusion portion, one end of the first protrusion portion is connected to one end of the second protrusion portion, and the other end of the first protrusion portion and the other end of the second protrusion portion extend in a direction away from each other.

[0022] According to some embodiments of the present invention, the angle between the first protrusion and the second protrusion is β, wherein β satisfies: 20°≤β≤80°.

[0023] According to some embodiments of the present invention, one end of the first protrusion and one end of the second protrusion are adjacent to the center of the one end of the pole core, and the other end of the first protrusion and the other end of the second protrusion extend in a direction away from the center of the one end of the pole core and pass through the outer periphery of the first current collecting disk.

[0024] According to some embodiments of the present invention, a notch is formed on the central edge of the end of the first current collecting plate away from the pole core.

[0025] According to some embodiments of the present invention, the notch is located between the other end of the first protrusion and the other end of the second protrusion. According to some embodiments of the present invention, the minimum distance between the connecting protrusion and the central axis of the pole core is d3, wherein d3 satisfies: 2mm≤d3≤8mm.

[0026] According to some embodiments of the present invention, the connecting protrusion is formed by a portion of a side surface of the first current collecting disk away from the first pole lug protruding toward a side surface adjacent to the first pole lug.

[0027] According to some embodiments of the present invention, the connecting protrusion forms a groove on the side surface of the first current collecting plate away from the first pole ear to form the connecting protrusion on the side surface adjacent to the first pole ear, and the depth of the groove is h, wherein h satisfies: 0mm<h≤2mm.

[0028] According to some embodiments of the present invention, a minimum distance between a side of the first current collecting disk away from the central axis of the pole core and an outer peripheral surface of the pole core is d4, wherein d4 satisfies: 0.5mm≤d4≤2mm.

[0029] According to some embodiments of the present invention, the first current collecting disc is a positive electrode current collecting disc, and the first current collecting disc is a stamped aluminum sheet part.

[0030] According to some embodiments of the present invention, the battery cell further comprises: a cover plate assembly, wherein the cover plate assembly is disposed on a side of the first current collecting plate away from the pole core.

[0031] According to some embodiments of the utility model, the cover plate assembly includes: a cover plate body, the second current collecting plate is connected to the cover plate body; a positive electrode pole, the positive electrode pole is penetrated through the cover plate body, the positive electrode pole is insulated and connected to the cover plate body, and the first current collecting plate is connected to the positive electrode pole.

[0032] According to some embodiments of the utility model, the positive pole includes a first pole segment and a second pole segment connected to each other, and the first pole segment is passed through the cover body; the cover assembly further includes: an insulating separator, and the insulating separator is arranged between the cover body and the second pole segment.

[0033] According to some embodiments of the utility model, a stop groove is formed on the insulating separator, and the second pole segment fits in the stop groove; a mating portion extending toward the stop groove is provided on the first current collecting plate, and the mating portion fits in the stop groove, and the mating portion is located on the side of the second pole segment away from the cover plate body.

[0034] According to some embodiments of the utility model, a stop protrusion is provided on the side surface of the insulating separator adjacent to the first current collecting disk, and the stop protrusion and the side surface of the insulating separator adjacent to the first current collecting disk jointly define the stop groove, and the side of the stop groove adjacent to the center of the first current collecting disk is open.

[0035] According to some embodiments of the present invention, the second current collecting plate is interference fit between the second pole lug and the cover plate body.

[0036] According to some embodiments of the present invention, the height of the second current collecting plate is h1, and the distance between the side surface of the cover body facing the first current collecting plate and the side surface of the first current collecting plate away from the cover is h2, wherein h1 and h2 satisfy: 0mm≤h1-h2≤1mm.

[0037] A battery according to an embodiment of the second aspect of the utility model includes a battery cell according to an embodiment of the first aspect of the utility model.

[0038] A battery module according to an embodiment of the third aspect of the utility model includes a battery according to an embodiment of the second aspect of the utility model.

[0039] The battery pack according to the fourth aspect of the present invention comprises the battery according to the second aspect of the present invention or the battery module according to the third aspect of the present invention.

[0040] The electrical device according to the fifth aspect of the present invention comprises a battery pack according to the fourth aspect of the present invention.

[0041] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0043] Figure 1 is a schematic diagram of a battery cell according to an embodiment of the utility model;

[0044] Figure 2 is an exploded view of a battery cell according to an embodiment of the utility model;

[0045] Figure 3 is a cross-sectional view of the end of a battery cell according to an embodiment of the utility model;

[0046] Figure 4is a partial schematic diagram of a battery cell according to an embodiment of the utility model, wherein the substrate is not shown;

[0047] Figure 5 is a schematic diagram of a second current collecting plate of a battery cell according to an embodiment of the utility model;

[0048] Figure 6 It is a top view of the assembly of the second current collecting disk, the first current collecting disk and the pole core of the battery cell according to an embodiment of the utility model;

[0049] Figure 7 It is a schematic diagram of assembling the cover plate assembly and the first current collecting plate of the battery cell according to an embodiment of the utility model;

[0050] Figure 8 is an exploded view of a cover plate assembly and a first current collecting plate of a battery cell according to an embodiment of the utility model;

[0051] Fig. 9 is a schematic diagram of a first current collecting plate of a battery cell according to an embodiment of the utility model;

[0052] Fig.10 is a schematic diagram of a cover plate assembly of a battery cell according to an embodiment of the utility model;

[0053] Fig.11 is a schematic diagram of a battery cell according to an embodiment of the utility model from another angle;

[0054] Fig.12 is an exploded view of a battery cell according to an embodiment of the utility model from another angle;

[0055] Fig.13 It is a schematic diagram of the sealing structure of the battery cell according to an embodiment of the utility model.

[0056] Reference numerals:

[0057] 100. Battery cell;

[0058] 1. Pole core; 11. First pole ear; 12. Second pole ear; 13. Center hole;

[0059] 2. first current collecting plate; 21. connecting protrusion; 211. first protrusion;

[0060] 212, second protrusion; 22, notch; 23, groove; 24, matching portion;

[0061] 3. Second current collecting plate; 31. First connecting portion; 311. First sub-connecting portion;

[0062] 3111, first side; 3112, second side;

[0063] 32. Second connection portion; 321. Second sub-connection portion;

[0064] 33. third connection part; 331. third sub-connection part; 332. fourth sub-connection part;

[0065] 4. Cover plate assembly; 41. Cover plate body; 42. Positive electrode column;

[0066] 421, first pole segment; 422, second pole segment;

[0067] 43. Insulating separator; 431. Anti-rotation groove; 432. Anti-rotation protrusion;

[0068] 5. Shell; 50. Shell body; 51. Bottom cover plate; 511. Liquid injection hole; 512. Sealing structure;

[0069] 5121, elastic sealing pad; 5122, sealing cover;

[0070] 6. A first insulating member; 7. A second insulating member;

[0071] 8. Base plate; 9. Separator. DETAILED DESCRIPTION

[0072] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figure 1-Figure 13 A battery cell 100 according to an embodiment of the first aspect of the present utility model is described.

[0073] like Figure 1 and Figure 2 As shown, the battery cell 100 according to the first embodiment of the utility model includes a pole core 1, a first current collecting plate 2 and a second current collecting plate 3.

[0074] Specifically, one end of the pole core 1 is provided with a first pole lug 11 and a second pole lug 12. Figure 1 and Figure 2 In the example, the first pole tab 11 and the second pole tab 12 are both located at the upper end of the pole core 1. The first pole tab 11 can be set as a positive pole tab, and the second pole tab 12 can be set as a negative pole tab. Therefore, the battery cell 100 is led out at the same end, so that the battery cell 100 only needs to set an exhaust channel at the above-mentioned one end of the pole core 1, thereby improving the space utilization rate in the battery cell 100.

[0075] Combination Figure 2 , the first current collecting disc 2 is provided at the above-mentioned end of the pole core 1, and the first current collecting disc 2 is connected to the first pole lug 11. The second current collecting disc 3 is provided at the above-mentioned end of the pole core 1, and the second current collecting disc 3 is connected to the second pole lug 12, and at least one of the second current collecting disc 3 and the first current collecting disc 2 is a single-layer structural member. For example, in Figure 2In the example, the first current collecting disc 2 and the second current collecting disc 3 are both arranged at the upper end of the pole core 1. The above-mentioned arrangement of the first current collecting disc 2 and the second current collecting disc 3 includes the following situations: first, only the first current collecting disc 2 is a single-layer structural member; second, only the second current collecting disc 3 is a single-layer structural member; third, the first current collecting disc 2 and the second current collecting disc 3 are both single-layer structural members. "Single-layer structural member" refers to: the part of the structural member itself that has no bending or overlapping along the thickness direction of the structural member, that is, the first current collecting disc 2 itself is a single-layer part without bending or overlapping, and the second current collecting disc 3 itself is a single-layer part without bending or overlapping.

[0076] Thus, the current on the first pole ear 11 can flow out through the first current collecting disk 3, and the current on the second pole ear 12 can flow out through the second current collecting disk 3, and the current can directly pass through the second current collecting disk 3 or the first current collecting disk 2 along the thickness direction of the first current collecting disk 2 or the second current collecting disk 3, thereby shortening the current flow path, reducing the structural impedance of the battery cell 100, facilitating the normal use of the battery cell 100, and improving the performance of the battery cell 100. In addition, the structure of the single-layer structural member is simple and the material used is less, thereby reducing the production cost of the second current collecting disk 3 and the first current collecting disk 2, and further reducing the production cost of the battery cell 100.

[0077] According to the battery cell 100 of the utility model, by setting at least one of the second current collecting disc 3 and the first current collecting disc 2 as a single-layer structural member, the current carrying energy of the first pole ear 11 or the second pole ear 12 can directly pass through the second current collecting disc 3 or the first current collecting disc 2 along the thickness direction of the first current collecting disc 2 or the second current collecting disc 3, respectively, thereby reducing the structural impedance of the battery cell 100, facilitating the normal use of the battery cell 100, and improving the performance of the battery cell 100. In addition, the single-layer structure is simple in structure and uses less material, thereby reducing the production cost of the battery cell 100. In addition, the battery cell 100 is led out on the same side, thereby improving the space utilization rate in the battery cell 100.

[0078] According to some embodiments of the present invention, referring to Figure 2 and Figure 3 , the first current collecting plate 2 is located on the side of the first pole lug 11 away from the pole core 1, and the second current collecting plate 3 is located on the side of the second pole lug 12 away from the pole core 1. Figure 2 and Figure 3In the example, the first current collecting disc 2 is arranged on the upper side of the first pole lug 11, and the lower side of the first current collecting disc 2 is connected to the upper side of the first pole lug 11. The second current collecting disc 3 is arranged on the upper side of the second pole lug 12, and the lower side of the second current collecting disc 3 is connected to the upper side of the second pole lug 12. Such an arrangement facilitates the assembly of the first current collecting disc 2 with the first pole lug 11, and also facilitates the assembly of the second current collecting disc 3 with the second pole lug 12, thereby improving the assembly efficiency of the battery cell 100. Moreover, the layout of the pole core 1, the first current collecting disc 2, and the second current collecting disc 3 is reasonable, so that the integration of the battery cell 100 is higher. In addition, after the battery cell 100 is installed, the second current collecting disc 3 and the first current collecting disc 2 are located at the end of the pole core 1, so that the second current collecting disc 3 and the first current collecting disc 2 are easy to detect, thereby improving the detectability of the second current collecting disc 3 and the first current collecting disc 2.

[0079] Optionally, the second current collecting disc 3 is connected to the second pole lug 12 by welding, and the first current collecting disc 2 is connected to the first pole lug 11 by welding. For example, the second current collecting disc 3 is laser welded to the second pole lug 12, and the first current collecting disc 2 is laser welded to the first pole lug 11. As a result, the connection between the second current collecting disc 3 and the second pole lug 12 is relatively firm, and the connection between the first current collecting disc 2 and the first pole lug 11 is relatively firm, thereby preventing the second current collecting disc 3 from falling off from the second pole lug 12, and preventing the first current collecting disc 2 from falling off from the first pole lug 11, thereby improving the connection stability of the first current collecting disc 2 and the second current collecting disc 3. Moreover, compared with traditional torque welding, the connection is made by laser welding, and the current flowing through the first current collecting disc 2 and the second current collecting disc 3 is not restricted, and the welding cost is low, thereby further reducing the production cost of the battery cell 100, and improving the welding yield and detectability of the battery cell 100. In addition, the welding method is simple, thereby improving the feasibility of the welding machine process.

[0080] According to some embodiments of the present invention, referring to Figure 5 The second current collecting plate 3 includes a first connecting portion 31 , a second connecting portion 32 and a third connecting portion 33 .

[0081] Specifically, the second current collecting plate 3 is connected to the second pole lug 12 via the first connecting portion 31, the second connecting portion 32 is arranged on a side of the first connecting portion 31 away from the second pole lug 12, and the third connecting portion 33 is connected to a side of the second connecting portion 32 away from the first connecting portion 31. Figure 5In the example, the lower side of the first connection part 31 is connected to the upper side of the second pole lug 12, the lower end of the second connection part 32 is connected to the upper side of the first connection part 31, the lower side of the third connection part 33 is connected to the upper end of the second connection part 32, the first connection part 31 can be formed by protruding in the direction of the second pole lug 12, the third connection part 33 can be formed by protruding in the direction away from the second pole lug 12, and there is a height difference between the third connection part 33 and the first connection part 31. As a result, the first connection part 31 is connected to the second pole lug 12, and the contact area between the first connection part 31 and the second pole lug 12 is large, so that the first connection part 31 and the second pole lug 12 are conveniently connected and firmly connected. In addition, the second connection part 32 acts as a reinforcing rib, and the second connection part 32 can support the first connection part 31 and the third connection part 33, thereby improving the structural strength of the second current collecting disk 3, which is conducive to the long-term and stable use of the second current collecting disk 3. Moreover, the connection between the first connecting portion 31 and the first pole lug 11 is strengthened, and the connection between the third connecting portion 33 and other components of the battery cell 100 (such as the cover body 41 and other electrical lead-out parts) is also strengthened to lead out the current of the second pole lug 12, thereby improving the connection flatness between the second current collecting disk 3 and the second pole lug 12, avoiding the collapse of the second current collecting disk 3 when subjected to force, and further improving the performance of the second current collecting disk 3.

[0082] In conventional technology, the single-layer current collector used is usually a flat sheet-shaped current collector without reinforcing ribs. The flatness of the contact surface between the second current collector and the second pole ear is poor, and the yield is poor during welding. In the solution of the present application, the first connection portion 31 of the second current collector 3 protrudes toward the second pole ear 12, and the second connection portion 32 protrudes away from the second pole ear 12. The first connection portion 31 is used to connect with the second pole ear 12, and the second connection portion 32 is used to connect with the cover body 41 and other electrical lead-out parts to lead out the current of the second pole ear 12. The second connection portion 32 plays a role in strengthening the structural strength of the second current collector 2, and at the same time supports and strengthens the connection between the first connection portion 31 and the second pole ear 12, as well as the connection with other electrical connectors. This makes the connection flatness between the second current collector 3 and the second pole ear 12 better, and it is not easy to collapse when subjected to force.

[0083] According to some embodiments of the present invention, referring to Figure 5 , the first connection portion 31 and the third connection portion 33 both extend in a direction perpendicular to the central axis of the pole core 1, and the second connection portion 32 is vertically connected between the first connection portion 31 and the third connection portion 33. Figure 5In the example, the first connection portion 31 and the third connection portion 33 are parallel to the upper side of the second pole lug 12, and the second connection portion 32 is perpendicular to the upper side of the second pole lug 12. Such a configuration improves the flatness of the second current collecting disc 3, thereby facilitating the second current collecting disc 3 to be connected to other components of the battery cell 100 through the third connection portion 33, improving the welding yield of the second current collecting disc 3 and other components of the battery cell 100, and effectively preventing the second current collecting disc 3 from falling off the battery cell 100, thereby improving the use stability of the second current collecting disc 3. In addition, the second current collecting disc 3 has a simple structure and is easy to produce and process, thereby improving the production efficiency of the second current collecting disc 3 and reducing the production cost of the second current collecting disc 3.

[0084] According to some embodiments of the present invention, referring to Figure 5 , the first connection portion 31 includes two first sub-connection portions 311 spaced apart from each other, each first sub-connection portion 311 includes a first side edge 3111 and a second side edge 3112, the first side edge 3111 and the second side edge 3112 are not on the same plane (i.e., the first side edge 3111 and the second side edge 3112 are arranged at an angle), the first side edges 3111 of the two first sub-connection portions 311 are opposite to each other, and the second side edges 3112 of the two first sub-connection portions 311 are located on the same straight line. For example, in Figure 5 In the example, the two first sub-connecting parts 311 are respectively located on both sides of the second connecting part 32, and the first sub-connecting part 311 can be arranged in a fan shape, and the first side 3111 and the second side 3112 are two straight sides of the fan shape. As a result, the two opposite side surfaces of the second current collecting disk 3 along the extension direction of the second side 3112 can be connected to the second pole lug 12, thereby improving the overall stability of the connection between the second current collecting disk 3 and the second pole lug 12, and the connection is firm, thereby preventing the second current collecting disk 3 from falling off the second pole lug 12, thereby improving the performance of the battery cell 100. In addition, the contact area between the second current collecting disk 3 and the second pole lug 12 is increased through the two first sub-connecting parts 311, thereby improving the connection strength between the second current collecting disk 3 and the second pole lug 12 and reducing the structural impedance of the battery cell 100.

[0085] Combination Figure 5 The second connection part 32 includes two second sub-connection parts 321 spaced apart from each other, one side of one second sub-connection part 321 is connected to the first side edge 3111 and the second side edge 3112 of one first sub-connection part 311, and one side of the other second sub-connection part 321 is connected to the first side edge 3111 and the second side edge 3112 of the other first sub-connection part 311. Figure 5In the example, the two second sub-connecting parts 321 correspond to the two first sub-connecting parts 311 one by one, and the two second sub-connecting parts 321 are arranged at intervals along the arrangement direction of the two first sub-connecting parts 311. The second sub-connecting parts 321 can be arranged vertically, and the second sub-connecting parts 321 are bent and extended along the first side edge 3111 and the second side edge 3112, and the bend is an arc-shaped transition. In this way, the structure of the second sub-connecting part 321 is simple, thereby simplifying the structure of the second current collecting disk 3, reducing the production difficulty of the second current collecting disk 3, and improving the production efficiency of the second current collecting disk 3. In addition, the structural strength of the second sub-connecting part 321 is strengthened, thereby further improving the supporting effect of the second connecting part 32 on the first connecting part 31 and the third connecting part 33, thereby improving the structural strength of the second current collecting disk 3.

[0086] Combination Figure 5 The third connection part 33 includes a third sub-connection part 331, and the third sub-connection part 331 is connected to the other side of the two second sub-connection parts 321 opposite to the first side edges 3111 of the two first sub-connection parts 311. For example, the lower surface of the third sub-connection part 331 is connected to the upper side of the second sub-connection part 321 opposite to the first side edges 3111, and the third sub-connection part 331 can be connected between the two second sub-connection parts 321, and both sides of the third sub-connection part 331 along the width direction of the third sub-connection part 331 extend beyond the second sub-connection part 321. Thus, the second current collecting plate 3 can be connected to the cover plate body 41 through the third sub-connection part 331.

[0087] Further, the third connection portion 33 includes a fourth sub-connection portion 332, one side of the fourth sub-connection portion 332 is connected to the other side of the two second sub-connection portions 321 opposite to the second side edges 3112 of the two first sub-connection portions 311 and the third sub-connection portion 331, and the other side of the fourth sub-connection portion 332 extends in a direction away from the first connection portion 31.

[0088] For example, in Figure 5In the example, the third connection part 33 is roughly in a "T" shape, the third sub-connection part 331 is a vertical section of the "T", the fourth sub-connection part 332 is a horizontal section of the "T", and the two sides of the width direction of the third sub-connection part 331 are respectively connected to the side of the two second sub-connection parts 321 away from the two first side edges 3111 (that is, the upper side of the second sub-connection part 321 opposite to the first side edges 3111). The plane where the fourth sub-connection part 332 is located is parallel to the plane where the first sub-connection part 311 is located, and the side of the fourth sub-connection part 332 facing the first connection part 31 is connected to the side of the two second sub-connection parts 321 away from the two second side edges 3112, and the side of the fourth sub-connection part 332 facing the first connection part 31 is connected to the side of the third sub-connection part 331 flush with the second side edges 3112. In this way, the two second sub-connection parts 321 are connected together through the third sub-connection part 331, so that the second current collecting plate 3 is connected as a whole, thereby improving the structural strength of the second current collecting plate 3. In addition, the fourth sub-connection portion 332 is provided to increase the area of ​​the third connection portion 33, and when the second current collecting disc 3 is connected to other components of the battery cell 100, the connection stability between the upper surface of the second current collecting disc 3 and other components of the battery cell 100 is improved. In addition, the second current collecting disc 3 has a simple structure and is easy to produce, thereby improving the production efficiency of the second current collecting disc 3. Moreover, the fourth sub-connection portion 332 has a reinforcing rib function, which improves the strength and flatness of the second current collecting disc 3 and improves the welding yield.

[0089] According to some embodiments of the present invention, referring to Figure 5 , the first side 3111 and the second side 3112 are perpendicular to each other. Figure 5 In the example, the two first sub-connecting parts 311 have substantially the same shape, and are both substantially in the shape of a right-angled sector. With such a configuration, the structure is simple, and the difficulty of adding the two first sub-connecting parts 311 is reduced, thereby increasing the production rate of the second current collecting plate 3. In addition, the two second sub-connecting parts 321 are substantially in a right-angle structure, thereby further increasing the supporting effect of the two second sub-connecting parts 321, and further increasing the structural strength of the second current collecting plate 3.

[0090] According to some embodiments of the present invention, referring to Figure 5 , the second current collecting disc 3 is symmetrically arranged with respect to the extension direction of the third sub-connecting portion 331 (that is, the extension direction of the first side 3111). In this arrangement, the third sub-connecting portion 311 and the second sub-connecting portion 321 corresponding to the lower portion of the third sub-connecting portion 311 are both located in the middle of the second current collecting disc 3, further improving the reinforcing support function of the second connecting portion 32, so that under pressure, the force on the second current collecting disc 3 is uniform, which can avoid the second current collecting disc 3 from being toppled and torn, thereby helping to further improve the connection strength between the second current collecting disc 3 and the second pole lug 12.

[0091] According to some embodiments of the present invention, referring to Figure 6 , the minimum distance between the first connecting portion 31 and the central axis of the pole core 1 is d1, where d1 satisfies: 2mm≤d1≤7.7mm. Figure 6 In the example, the minimum distance between the second side 3112 and the central axis of the pole core 1 is d1. For example, when the minimum distance between the first connection portion 31 and the central axis of the pole core 1 is greater than 7.7 mm, the contact area between the first connection portion 31 and the second pole lug 12 is small, thereby reducing the uniformity of the distribution of the welding points and improving the structural impedance of the pole core 1. When the minimum distance between the first connection portion 31 and the central axis of the pole core 1 is less than 2 mm, the spacing between the first connection portion 31 and the first current collecting disk 2 is small, so that the second current collecting disk 3 is easy to contact with the first current collecting disk 2, and the second current collecting disk 3 and the first current collecting disk 2 are prone to short circuit, thereby affecting the normal use of the battery cell 100. Therefore, by setting the minimum distance d1 between the first connection portion 31 and the central axis of the pole core 1 to satisfy 2 mm ≤ d1 ≤ 7.7 mm, the uniformity of the distribution of the welding points at the connection between the first connection portion 31 and the second current collecting disk 3 is improved, and the structural impedance of the pole core 1 is reduced. In addition, the second current collecting disc 3 and the first current collecting disc 2 are prevented from contacting and causing a short circuit, thereby facilitating the normal use of the battery cell 100 for a long time.

[0092] According to some embodiments of the present invention, referring to Figure 6 , the first connection portion 31 is located radially inward of the outer periphery of the pole core 1, and the distance between the first connection portion 31 and the outer periphery of the pole core 1 is d2, wherein d2 satisfies: 0.5mm≤d2≤2mm. For example, when the distance d2 between the first connection portion 31 and the outer periphery of the pole core 1 is greater than 2mm, the connection area between the first connection portion 31 and the second pole tab 12 is small, the connection stability between the second current collecting disk 3 and the second pole tab 12 is reduced, and it is not conducive to the passage of the current, thereby increasing the structural impedance of the battery cell 100. When the distance d2 between the first connection portion 31 and the outer periphery of the pole core 1 is less than 0.5mm, the first connection portion 31 is easy to contact the outer shell 5 provided on the outer periphery of the pole core 1, so that the current of the battery cell 100 will pass through the outer shell 5, resulting in a higher structural impedance of the battery cell 100. Thus, by setting the distance d2 between the first connection portion 31 and the outer periphery of the pole core 1 to satisfy 0.5 mm ≤ d2 ≤ 2 mm, the connection area between the first connection portion 31 and the second pole tab 12 is large, the second current collecting plate 3 and the second pole tab 12 are firmly connected, and the structural impedance of the battery cell 100 is reduced. In addition, the first connection portion 31 can be effectively prevented from contacting the outer shell 5 of the battery cell 100, thereby preventing the current of the battery cell 100 from passing through the outer shell 5, thereby further reducing the structural impedance of the battery cell 100.

[0093] According to some embodiments of the utility model, the second current collecting disc 3 is a negative electrode current collecting disc, and the second current collecting disc 3 is a steel or copper stamping part. Steel has corrosion resistance and electrical conductivity, and copper has good ductility and high electrical conductivity. Therefore, when the second current collecting disc 3 is a steel part, it is conducive to the normal use of the second current collecting disc 3, and the structural strength of the second current collecting disc 3 is improved, which is conducive to the long-term and stable use of the second current collecting disc 3. In addition, when the second current collecting disc 3 is a copper stamping part, the flatness of the second current collecting disc 3 is improved by copper stamping, thereby improving the use performance of the second current collecting disc 3, and the second current collecting disc 3 is easy to form, which reduces the production difficulty of the second current collecting disc 3, thereby facilitating the improvement of the production efficiency of the second current collecting disc 3.

[0094] According to some embodiments of the present invention, referring to Figure 2-Figure 4 A connection protrusion 21 is provided on one side of the surface of the first current collecting disc 2 adjacent to the first pole lug 11, and the first current collecting disc 2 is connected to the first pole lug 11 via the connection protrusion 21. Figure 2-Figure 4 In the example, the connection protrusion 21 is formed by a part of the first current collecting disc 2 protruding toward the direction of the first pole lug 11. In this way, the first current collecting disc 2 is connected to the first pole lug 11 through the contact of the connection protrusion 21, which facilitates the interference fit of the first current collecting disc 2 and the first pole lug 11, thereby improving the welding yield when the first current collecting disc 2 is connected to the first pole lug 11 by welding, thereby improving the connection strength between the first current collecting disc 2 and the first pole lug 11. In addition, the structure of the connection protrusion 21 is simple, thereby simplifying the structure of the first current collecting disc 2, which is conducive to the mass production of the first current collecting disc 2.

[0095] Further, refer to Fig. 9 The connecting protrusion 21 includes a first protrusion portion 211 and a second protrusion portion 212, one end of the first protrusion portion 211 is connected to one end of the second protrusion portion 212, and the other end of the first protrusion portion 211 and the other end of the second protrusion portion 212 extend in a direction away from each other.

[0096] For example, in Fig. 9In the example, the connection protrusion 21 can be set in a "V" shape, and one end of the first protrusion 211 close to the center of the first current collecting disk 2 is connected to one end of the second protrusion 212 close to the center of the first current collecting disk 2, and the other end of the first protrusion 211 and the other end of the second protrusion 212 both extend in a direction away from the center of the first current collecting disk 2, and the first protrusion 211 and the second protrusion 212 are symmetrical about the center line of the first current collecting disk 2. In this way, the connection protrusion 21 has a simple structure and a reasonable design, so that after the first current collecting disk 2 is connected to the first pole lug 11, the stability of the overall connection between the first current collecting disk 2 and the first pole lug 11 is improved, and the first current collecting disk 2 is prevented from shaking or rotating, thereby improving the use stability of the battery cell 100. In addition, the connection protrusion 21 has low processing difficulty, thereby reducing the processing difficulty of the first current collecting disk 2 and improving the production efficiency of the first current collecting disk 2.

[0097] According to some embodiments of the present invention, referring to Fig. 9 , the angle between the first protrusion 211 and the second protrusion 212 is β, wherein β satisfies: 20°≤β≤80°. For example, when the angle β between the first protrusion 211 and the second protrusion 212 is greater than 80°, the distance between the other end of the first protrusion 211 and the other end of the second protrusion 212 is large, so that the distance between the welding points at the edge of the first current collecting disk 2 is large, which reduces the connection stability between the first current collecting disk 2 and the first pole lug 11 of the battery cell 100. When the angle β between the first protrusion 211 and the second protrusion 212 is less than 20°, the distance between the other end of the first protrusion 211 and the other end of the second protrusion 212 is small, and the distance between the two opposite sides of the first protrusion 211 and the second protrusion 212 is small, which reduces the uniformity of the distribution of the welding points of the first current collecting disk 2, thereby reducing the connection stability of the first current collecting disk 2. Therefore, by setting the included angle β between the first protrusion 211 and the second protrusion 212 to satisfy 20°≤β≤80°, the positions of the first protrusion 211 and the second protrusion 212 are moderately distributed, thereby improving the uniformity of the distribution of the welding points of the first collecting disc 2, thereby improving the connection stability of the first collecting disc 2, and facilitating the long-term use of the first collecting disc 2.

[0098] According to some embodiments of the present invention, referring to Fig. 9 , the one end of the first protrusion 211 and the one end of the second protrusion 212 are adjacent to the center of the one end of the pole core 1, and the other end of the first protrusion 211 and the other end of the second protrusion 212 extend in a direction away from the center of the one end of the pole core 1 and pass through the outer periphery of the first current collecting plate 2. For example, Fig. 9In the example, the above-mentioned one end of the first protrusion 211 and the above-mentioned one end of the second protrusion 212 are connected. In this way, the overlapping area between the first protrusion 211 and the second protrusion 212 and the first pole ear 11 is increased, thereby increasing the contact area and further reducing the structural impedance of the battery cell 100. In addition, the structure of the first protrusion 211 and the second protrusion 212 is simple, which is convenient for the production of the connecting protrusion 21, thereby improving the production efficiency of the first current collecting disk 2. In addition, by arranging the ends of the first protrusion 211 and the second protrusion 212 that are away from each other to pass through the outer periphery of the first current collecting disk 2, the thickness of the edge of the first current collecting disk 2 is reduced, which is more conducive to the passage of current and further reduces the structural impedance. According to some embodiments of the utility model, with reference to Fig. 9 A notch 22 is formed at the center edge of the first current collecting plate 2 away from the end of the pole core 1. Fig. 9 In the example, the notch 22 is recessed toward the center of the first current collecting disc 2, and the notch 22 can be set in a semicircular shape. Therefore, when the first current collecting disc 2 is connected to the first pole lug 11 by laser welding, during the cooling process of the first current collecting disc 2 after welding, due to different thermal expansion coefficients, some areas shrink more than other areas, which will cause residual stress in the welding area. The notch 22 can relieve the above residual stress, thereby preventing the first current collecting disc 2 and the first pole lug 11 from being thermally deformed during welding and causing poor welding, thereby further improving the connection strength between the first current collecting disc 2 and the first pole lug 11.

[0099] According to some embodiments of the present invention, referring to Fig. 9 , the notch 22 is located between the other end of the first protrusion 211 and the other end of the second protrusion 212. Therefore, the position of the notch 22 is reasonably set, roughly in the middle of the center edge of the one end of the first current collecting disc 2 away from the pole core 1. When the first current collecting disc 2 is welded to the first pole lug 11 through the first protrusion 211 and the second protrusion 212, the notch 22 can better relieve the above residual stress, thereby further improving the welding yield of the first current collecting disc 2 and the first pole lug 11, and further contributing to further strengthening the connection strength between the first current collecting disc 2 and the first pole lug 11.

[0100] According to some embodiments of the present invention, referring to Figure 6, the minimum distance between the connecting protrusion 21 and the central axis of the pole core 1 is d3, wherein d3 satisfies: 2mm≤d3≤8mm. For example, when the minimum distance d3 between the connecting protrusion 21 and the central axis of the pole core 1 is greater than 8mm, the overlap area between the first current collecting disc 2 and the first pole lug 11 is reduced, and the contact area between the first current collecting disc 2 and the first pole lug 11 is reduced, thereby improving the structural impedance of the battery cell 100. When the minimum distance d3 between the connecting protrusion 21 and the central axis of the pole core 1 is less than 2mm, the spacing between the first current collecting disc 2 and the second current collecting disc 3 is small, so that the first current collecting disc 2 is easy to contact with the second current collecting disc 3, and the second current collecting disc 3 and the first current collecting disc 2 are prone to short circuit, thereby affecting the normal use of the battery cell 100. Therefore, by setting the minimum distance d3 between the connecting protrusion 21 and the central axis of the pole core 1 to satisfy 2mm≤d3≤8mm, the contact area between the first current collecting disc 2 and the first pole lug 11 is increased, thereby reducing the structural impedance of the battery cell 100. In addition, a short circuit between the first current collecting disc 2 and the second current collecting disc 3 can be effectively avoided, which is beneficial to the normal use of the battery cell 100. In addition, the welding point track between the first current collecting disc 2 and the first pole lug 11 is close to the inner side of the pole core 1, thereby improving the distribution uniformity of the welding points, which is more beneficial to the connection between the first current collecting disc 2 and the first pole lug 11.

[0101] According to some embodiments of the present invention, referring to Figure 3 and Figure 4 The connection protrusion 21 is formed by a portion of the side surface of the first current collecting plate 2 away from the first pole lug 11 protruding toward the side surface adjacent to the first pole lug 11. Figure 3 and Figure 4 In the example, the connection protrusion 21 is formed by a portion of the upper surface of the first current collecting disc 2 protruding downward. In this way, the thickness of the area where the connection protrusion 21 is located on the first current collecting disc 2 is reduced, thereby shortening the path of the current flowing through the connection protrusion 21, which is more conducive to the use of the first current collecting disc 2 and further reduces the structural impedance. In addition, the connection protrusion 21 has a simple structure and low processing difficulty, which reduces the production cost of the first current collecting disc 2 and improves the production efficiency of the first current collecting disc 2.

[0102] According to some embodiments of the present invention, referring to Figure 3 and Fig. 9 The connecting protrusion 21 forms a groove 23 on the side surface of the first current collecting plate 2 away from the first pole lug 11 to form a connecting protrusion 21 on the side surface adjacent to the first pole lug 11, and the depth of the groove 23 is h, where h satisfies: 0mm<h≤2mm. For example, Figure 3 and Fig. 9In the example, the connecting protrusion 21 forms a V-shaped groove on the upper surface of the first current collecting disc 2. When the depth h of the groove 23 is greater than 2 mm, the height of the side wall of the groove 23 is high, thereby reducing the structural strength of the connecting protrusion 21, and further reducing the structural strength of the first current collecting disc 2. When the depth of the groove 23 is equal to 0 mm, the lower surface of the first current collecting disc 2 is completely in contact with the first pole ear 11 and welded, the welding area is large, the welding cost is high, and it is not conducive to the connection between the first current collecting disc 2 and other components of the battery cell 100. Therefore, by setting the depth h of the groove 23 to satisfy 0 mm < h ≤ 2 mm, the structural strength of the connecting protrusion 21 is improved, and further the structural strength of the first current collecting disc 2 is improved. In addition, the welding cost of the first current collecting disc 2 is reduced, which is also conducive to the connection between the first current collecting disc 2 and other components of the battery cell 100.

[0103] Optionally, refer to Figure 6 , the minimum distance between the side of the first current collecting disk 2 away from the central axis of the pole core 1 and the outer peripheral surface of the pole core 1 is d4, where d4 satisfies: 0.5mm≤d4≤2mm. For example, when the minimum distance d4 between the side of the first current collecting disk 2 away from the central axis of the pole core 1 and the outer peripheral surface of the pole core 1 is greater than 2mm, the connection area between the first current collecting disk 2 and the first pole lug 11 is small, which is not conducive to the flow of current between the first pole lug 11 and the first current collecting disk 2, thereby increasing the structural impedance of the battery cell 100. When the minimum distance d4 between the first current collecting disk 2 and the outer peripheral surface of the pole core 1 is less than 0.5mm, the first current collecting disk 2 is easy to contact the outer shell 5 of the outer periphery of the pole core 1, so that the current of the battery cell 100 will pass through the outer shell 5, resulting in a high structural impedance of the battery cell 100. Thus, by setting the distance d4 between the first current collecting disc 2 and the outer periphery of the pole core 1 to satisfy 0.5 mm ≤ d4 ≤ 2 mm, the connection area between the first current collecting disc 2 and the first pole lug 11 is large, the connection between the first current collecting disc 2 and the first pole lug 11 is stable, and it is conducive to the flow of the current, thereby reducing the structural impedance of the battery cell 100. In addition, the first current collecting disc 2 is effectively prevented from contacting the outer shell 5 of the battery cell 100, thereby preventing the current of the battery cell 100 from passing through the outer shell 5, thereby further reducing the structural impedance of the battery cell 100. In addition, the welding track between the first current collecting disc 2 and the first pole lug 11 is closer to the inner side of the pole core 1, thereby improving the uniformity of the distribution of the welding points of the first current collecting disc 2.

[0104] According to some optional embodiments of the utility model, the first current collecting disc 2 is a positive current collecting disc, and the first current collecting disc 2 can be set as an aluminum sheet stamping part. The aluminum part has a certain structural strength. As a result, the structural strength of the first current collecting disc 2 is improved, which is conducive to the long-term and stable use of the first current collecting disc 2. In addition, the aluminum part is conductive, so it is easy to carry current through the first current collecting disc 2. In addition, the flatness of the first current collecting disc 2 is improved by aluminum stamping, thereby improving the performance of the first current collecting disc 2. But it is not limited to this.

[0105] Further, refer to Figure 4 The battery cell 100 includes a cover plate assembly 4, which is disposed on a side of the first current collecting plate 2 away from the pole core 1. Figure 4 In the example, the cover plate assembly 4 is connected to the first current collecting disc 2, and the cover plate assembly 4 is connected to the pole core 1 through the first current collecting disc 2. When assembling the battery cell 100, the first current collecting disc 2 is first connected to the first pole lug 11, and then the first current collecting disc 2 is connected to the cover plate assembly 4, so that the current carrying capacity of the first current collecting disc 2 is led out to the outside of the battery cell 100 through the cover plate assembly 4, so as to facilitate the normal use of the battery cell 100. In addition, the assembly operation of the cover plate assembly 4 with the first current collecting disc 2 and the pole core 1 is simple, thereby improving the assembly efficiency of the battery cell 100.

[0106] According to some embodiments of the present invention, referring to Figure 7 and Figure 8 The cover plate assembly 4 includes a cover plate body 41 and a positive electrode column 42 .

[0107] Specifically, the second current collecting plate 3 is connected to the cover plate body 41, the positive pole 42 is passed through the cover plate body 41, the positive pole 42 is insulated and connected to the cover plate body 41, and the first current collecting plate 2 is connected to the positive pole 42. Figure 7 and Figure 8 In the example, the upper surface of the third connection portion 33 of the second current collecting disk 3 is connected to the lower surface of the cover body 41 (for example, by welding). The upper surface of the first current collecting disk 2 is connected to the lower end face of the positive electrode column 42 (for example, by welding). As a result, the current-carrying flow path for the positive electrode of the battery cell 100 flows through the first pole ear 11, the first current collecting disk 2 and the positive electrode column 42 in sequence and then leads out, and the current-carrying flow path for the negative electrode of the battery cell 100 flows through the second pole ear 12 and the cover body 41 in sequence and then leads out, so that the current-carrying flow paths at the positive and negative electrodes of the battery cell 100 are both short, further reducing the structural impedance of the battery cell 100, which is more conducive to the use of the battery cell 100. In addition, the positive electrode column 42 is insulated and connected to the cover body 41, thereby avoiding a short circuit between the positive electrode column 42 and the cover body 41, and further avoiding a short circuit between the first current collecting disk 2 and the second current collecting disk 3, so as to facilitate the long-term normal use of the battery cell 100.

[0108] According to some embodiments of the present invention, referring to Figure 3 and 8 The positive pole 42 includes a first pole segment 421 and a second pole segment 422 connected to each other, and the first pole segment 421 is disposed on the cover body 41. Figure 3 and Figure 8 In the example, the lower end of the first pole segment 421 is connected to the upper surface of the second pole segment 422, the cross section of the second pole segment 422 is larger than the cross section of the first pole segment 421, and the lower surface of the second pole segment 422 is welded to a portion of the upper surface of the first current collecting disk 2. In this way, the first pole segment 421 is conducive to the connection between the positive pole 42 and the cover body 41, and the second pole segment 422 is conducive to the connection between the positive pole 42 and the first current collecting disk 2, thereby facilitating the connection between the positive pole 42 and the cover body 41 and the first current collecting disk 2, and the connection is stable, which is conducive to the long-term use of the positive pole 42. In addition, the structure of the positive pole 42 is simple, which is conducive to the use of the positive pole 42 and also to the production and processing of the positive pole 42.

[0109] Combination Figure 3 and Figure 8 The cover assembly 4 further includes an insulating spacer 43, which is disposed between the cover body 41 and the second pole segment 422. Figure 3 and Figure 8 In the example, the first pole segment 421 passes through the insulating separator 43 and is connected to the cover body 41, and the second pole segment 422 is located below the insulating separator 43 and is connected to the first current collecting disc 2. Therefore, by providing the insulating separator 43, on the one hand, the cover body 41 and the second pole segment 422 can be insulated to prevent a short circuit between the cover body 41 and the positive pole 42, thereby preventing a short circuit between the first current collecting disc 2 and the second current collecting disc 3. On the other hand, the cover body 41 and the first current collecting disc 2 are insulated, so that the current on the first current collecting disc 2 can only flow through the positive pole 42 and then be led out, and will not flow to the cover body 41, thereby avoiding a short circuit between the first current collecting disc 2 and the cover body 41, which is more conducive to the normal use of the battery cell 100.

[0110] Further, refer to Figure 3 and Fig.10 The insulating separator 43 is formed with a rotation-stopping groove 431, and the second pole segment 422 fits in the rotation-stopping groove 431. The first current collecting plate 2 is provided with a matching portion 24 extending toward the rotation-stopping groove 431, and the matching portion 24 fits in the rotation-stopping groove 431. The matching portion 24 is located on the side of the second pole segment 422 away from the cover body 41. For example, Figure 3 and Fig.10In the example, the anti-rotation groove 431 is formed on the lower surface of the insulating separator 43, and the outer peripheral surface of the second pole segment 422 is in contact with the side wall of the anti-rotation groove 431. The matching portion 24 is located in the anti-rotation groove 431, and the outer peripheral surface of the matching portion 24 is in contact with the side wall of the anti-rotation groove 431, and the upper surface of the matching portion 24 is in contact with the lower surface of the second pole segment 422. In this way, after the insulating separator 43 is assembled with the positive pole 42 and the first current collecting disk 2, the anti-rotation groove 431 has a limiting effect on the second pole segment 422 and the matching portion 24, which can effectively prevent the positive pole 42 and the first current collecting disk 2 from rotating in a plane perpendicular to the central axis of the pole core 1, thereby improving the assembly stability of the cover plate assembly 4 and the first current collecting disk 2, and also avoiding the contact between the first current collecting disk 2 and the second current collecting disk 3 during rotation, thereby reducing the requirements for the processing accuracy of the pole core 1, the first pole lug 11 and the second pole lug 12, and improving the production efficiency of the pole core 1. In addition, when the insulating separator 43 is assembled with the second pole segment 422 and the mating portion 24, the stop groove 431 facilitates the positioning of the second pole segment 422 and the mating portion 24, thereby helping to improve the rapid assembly of the insulating separator 43 with the positive pole 42 and the first current collecting plate 2, thereby improving the assembly efficiency of the battery cell 100.

[0111] According to some embodiments of the present invention, referring to Figure 3 and Fig.10 , a stop protrusion 432 is provided on a side surface of the insulating separator 43 adjacent to the first current collecting disc 2, and the stop protrusion 432 and the side surface of the insulating separator 43 adjacent to the first current collecting disc 2 jointly define a stop groove 431, and the side of the stop groove 431 adjacent to the center of the first current collecting disc 2 is open. For example, in 3 and Fig.10 In the example, the stop protrusion 432 can be set in a "C" shape, and the shape of the stop protrusion 432 corresponds to the end of the second pole segment 422 facing the second current collecting disk 3 and the side of the matching portion 24 facing the second current collecting disk 3. Such a configuration facilitates the insertion of the matching portion 24 of the first current collecting disk 2 from the open side of the stop groove 431 into the stop groove 431 in the direction perpendicular to the axis of the pole core 1, thereby facilitating the assembly of the matching portion 24 and the stop protrusion 432, thereby improving the assembly efficiency of the insulating separator 43 and the first current collecting disk 2. In addition, it is also beneficial for the stop protrusion 432 to fully contact with the second pole segment 422 and the matching portion 24, so as to improve the connection stability of the insulating separator 43 with the positive pole 42 and the first current collecting disk 2. In addition, the structure of the stop protrusion 432 is simple, thereby simplifying the structure of the insulating separator 43, which is more conducive to the mass production of the insulating separator 43.

[0112] Optionally, the cover plate assembly 4 is connected to the first current collecting plate 2 by welding. Thus, the connection between the cover plate assembly 4 and the first current collecting plate 2 is relatively firm, thereby preventing the first current collecting plate 2 from falling off the cover plate assembly 4, thereby ensuring the stability of the cover plate assembly 4 and the first current collecting plate 2 in long-term use. However, it is not limited thereto.

[0113] According to some embodiments of the present invention, referring to Figure 3 , the second current collecting plate 3 is interference fit between the second pole ear 12 and the cover plate body 41. Figure 3 In the example, the upper surface of the second current collecting disc 3 is connected to the lower surface of the cover body 41, and the lower surface of the second current collecting disc 3 is connected to the second pole lug 12. As a result, the contact between the second current collecting disc 3 and the second pole lug 12 and the cover body 41 is more compact, thereby improving the sealing of the contact between the second current collecting disc 3 and the cover body 41, and further improving the welding yield of the second current collecting disc 3 and the second pole lug 12 and the cover body 41.

[0114] According to some optional embodiments of the present invention, referring to Figure 3 , the height of the second current collecting disc 3 is h1, and the distance between the side surface of the cover plate body 41 facing the first current collecting disc 2 and the side surface of the first current collecting disc 2 away from the cover plate is h2, wherein h1 and h2 satisfy: 0mm≤h1-h2≤1mm. In other words, h2 refers to the vertical distance between the lower surface of the cover plate body 41 and the lower surface of the connecting protrusion 21. During the assembly process of the battery cell 100, the cover plate assembly 4 is first connected to the first current collecting disc 2 and then to the second current collecting disc 3. For example, when the height h1 of the second current collecting disc 3 and the distance h2 between the side surface of the cover body 41 facing the first current collecting disc 2 and the side surface of the first current collecting disc 2 away from the cover plate satisfy that h1-h2 is greater than 1 mm, the height of the second current collecting disc 3 is relatively large, which is not conducive to the contact between the cover body 41 and the upper surface of the second current collecting disc 3, and will reduce the contact area between the cover body 41 and the second current collecting disc 3, reduce the connection stability between the cover body 41 and the second current collecting disc 3, and is not conducive to the normal use of the battery cell 100. Therefore, by setting the height h1 of the second current collecting disc 3 and the distance h2 between the side surface of the cover body 41 facing the first current collecting disc 2 and the side surface of the first current collecting disc 2 away from the cover plate to satisfy 0mm≤h1-h2≤1mm, the sealing of the contact between the second current collecting disc 3 and the cover body 41 and the second pole lug 12 is improved, and the welding yield and connection stability of the second current collecting disc 3 and the cover body 41 and the second pole lug 12 are improved, which is conducive to the long-term and stable use of the second current collecting disc 3.

[0115] Optionally, the pole core 1 is formed by winding, and the pole ear is a flattened pole ear or a cut and stacked pole ear, and the pole ear is divided into two sides, one side is a first pole ear 11, and the first pole ear 11 is connected to the first current collecting disk 2, and the other side is a second pole ear 12, and the second pole ear 12 is connected to the first current collecting disk 2, and the first pole ear 11 and the second pole ear 12 are arranged at intervals along the radial direction of the pole core 1. Thus, the production of the pole core 1 is facilitated. In addition, the first pole ear 11 and the second pole ear 12 can be prevented from overlapping and short-circuiting, so that the battery cell 100 can be used normally for a long time, and the service life of the battery cell 100 is extended.

[0116] Further optionally, referring to Figure 2 , a center hole 13 is provided in the center area of ​​the pole core 1, and the center hole 13 is located between the first pole lug 11 and the second pole lug 12, and the sides opposite to the first pole lug 11 and the second pole lug 12 are tangent to the edge of the center hole 13, and the diameter of the center hole 13 is d5, wherein d5 satisfies: 2mm≤d5≤10mm. When the diameter d5 of the center hole 13 is greater than 10mm, the area of ​​the first pole lug 11 and the second pole lug 12 is small, thereby reducing the contact area between the first pole lug 11 and the second pole lug 12 and the corresponding first current collecting disk 2 and the second current collecting disk 3, which is not conducive to the normal use of the battery cell 100. When the diameter d5 of the center hole 13 is less than 2mm, the distance between the first pole lug 11 and the second pole lug 12 is small, and overlapping short circuit is prone to occur, which is not conducive to the normal use of the battery cell 100. Therefore, by setting the diameter d5 of the center hole 13 to satisfy 2mm≤d5≤10mm, the contact area between the first pole ear 11 and the second pole ear 12 and the pole core 1 can be increased, thereby reducing the impedance of the battery cell 100, and the first pole ear 11 and the second pole ear 12 can be prevented from overlapping and short-circuiting, thereby extending the service life of the battery cell 100.

[0117] Optionally, refer to Figure 3 , a first insulating member 6 is provided between the first pole lug 11 and the second pole lug 12, the lower surfaces of the first insulating member 6 on both sides in the width direction are respectively connected to the upper surfaces of the two opposite ends of the first pole lug 11 and the second pole lug 12, and the upper surface of the first insulating member 6 is connected to the lower surface of the matching portion 24 of the first current collecting disk 2. In this way, the first insulating member 6 insulates the first pole lug 11 and the second pole lug 12, thereby avoiding a short circuit between the first pole lug 11 and the second pole lug 12. For example, the first insulating member 6 can be set as an insulating glue so that the first insulating member 6 has a bonding effect, so that the first insulating member 6 is easy to use and has a low cost.

[0118] According to some optional embodiments of the present invention, referring to Figure 2 and Figure 3, a second insulating member 7 is provided on the side of the first current collecting disc 2 away from the first pole ear 11, a substrate 8 is connected to the side of the cover plate assembly 4 away from the pole core 1, the outer peripheral edge of the substrate 8 is connected to the shell 5, and the pole core 1, the second current collecting disc 3, the first current collecting disc 2 and the cover plate assembly 4 are all located in the shell 5. Thus, the second insulating member 7 wraps the upper side and outer peripheral surface of the first current collecting disc 2, the side of the second insulating member 7 is located between the first current collecting disc 2 and the shell 5 of the battery cell 100, and the side of the second insulating member 7 away from the first pole ear 11 is connected to the substrate 8, so that the second insulating member 7 insulates and connects the first current collecting disc 2 with the substrate 8 and the shell 5 respectively, so as to prevent the first current collecting disc 2 from short-circuiting with the substrate 8 and the shell 5, and also ensures that the current-carrying flow of the first current collecting disc 2 flows out after passing through the positive pole column 42, thereby ensuring that the impedance of the battery cell 100 is low. In addition, the substrate 8 shields the internal components of the housing 5 , which can protect the components inside the housing 5 and prevent the components inside the housing 5 from being damaged, while making it difficult to view the internal structure of the housing 5 , thereby improving the aesthetics of the battery cell 100 .

[0119] Further, refer to Figure 1 and Figure 2 The battery cell 100 includes a separator 9. The pole core 1 and the separator 9 are both arranged in the housing 5. The separator 9 is located between the pole core 1 and the inner wall of the housing 5. The pole core 1 is separated from the inner wall of the housing 5 by the separator 9. Figure 1 and Figure 2 In the example, the separator 9 is arranged at one end of the outer shell 5 along the up-down direction, and the separator 9 is located between the lower end of the pole core 1 and the bottom wall of the outer shell 5. In this way, the separator 9 separates the pole core 1 from the outer shell 5, so that the current on the pole core 1 cannot pass through the outer shell 5, thereby reducing the structural impedance of the battery cell 100. In addition, the end of the pole core 1 adjacent to the separator 9 does not contact the bottom wall of the outer shell 5, and the separator 9 has a protective effect on the pole core 1, which can prevent the pole core 1 from being directly in contact with the outer shell 5 and causing damage to the pole core 1, thereby extending the service life of the pole core 1, and then extending the service life of the battery cell 100. In addition, the separator 9 is simple to install and operate, and the separator 9 can be placed in the outer shell 5, thereby improving the assembly efficiency of the battery cell 100.

[0120] Optionally, refer to Figure 11-13The shell 5 includes a shell body 50 and a bottom cover plate 51. The bottom cover plate 51 is connected to the lower end of the shell body 50 to define a space for placing the pole core 1. The bottom cover plate 51 is connected to the shell body 50 by welding. A liquid injection hole 511 is provided on the bottom cover plate 51. A sealing structure 512 matched with the liquid injection hole 511 is provided at the liquid injection hole 511. The sealing structure 512 includes an elastic sealing pad 5121 and a sealing cover 5122. The side of the elastic sealing pad 5121 away from the pole core 1 is connected to the sealing cover 5122. The sealing cover 5122 is welded to the elastic sealing pad 5121 and the inner wall of the liquid injection hole 511. As a result, the connection strength between the bottom cover plate 51 and the circumferential side wall of the shell body 50 is strengthened, thereby improving the structural strength of the shell 5, which is conducive to the long-term and stable use of the shell 5. In addition, the processing accuracy of the shell body 50 and the bottom cover plate 51 is improved, thereby improving the processing accuracy of the shell 5. In addition, after the electrolyte is injected into the battery cell 100 through the injection hole 511, the elastic sealing gasket 5121 is used to seal the injection hole 511, thereby preventing the electrolyte from flowing out, thereby preventing damage to the battery cell 100. The sealing cover 5122 further improves the sealing performance between the elastic sealing gasket 5121 and the injection hole 511, thereby further preventing the electrolyte from flowing out, thereby further preventing damage to the battery cell 100.

[0121] A battery according to an embodiment of the second aspect of the utility model (not shown) comprises a battery cell 100 according to an embodiment of the first aspect of the utility model.

[0122] According to the battery of the embodiment of the utility model, by adopting the above-mentioned battery core 100, the service life of the battery is prolonged and the use performance of the battery is improved.

[0123] A battery module (not shown) according to an embodiment of the third aspect of the utility model comprises a battery according to an embodiment of the second aspect of the utility model.

[0124] According to the battery module of the embodiment of the utility model, by adopting the above-mentioned battery, the service life of the battery module is prolonged and the use performance of the battery module is improved.

[0125] A battery pack (not shown) according to an embodiment of the fourth aspect of the utility model comprises a battery according to an embodiment of the second aspect of the utility model or a battery module according to an embodiment of the third aspect of the utility model.

[0126] According to the battery pack of the embodiment of the present invention, by adopting the above-mentioned battery or the above-mentioned battery module, the service life of the battery pack is extended, and the impedance inside the battery is reduced, thereby improving the performance of the battery pack.

[0127] An electrical device (not shown) according to an embodiment of the fifth aspect of the utility model comprises a battery pack according to an embodiment of the fourth aspect of the utility model.

[0128] According to the electric device of the embodiment of the utility model, the use performance of the electric device is improved by adopting the above-mentioned battery pack. The electric device can be a vehicle, an electric two-wheeled vehicle, an electric multi-wheeled vehicle, an energy storage cabinet, an unmanned aerial vehicle, a ship, etc.

[0129] Other structures and operations of the battery cell 100, battery, battery module, battery pack and electrical device according to the embodiment of the present invention are well known to those skilled in the art and will not be described in detail here.

[0130] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside", "axial", "circumferential", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0131] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0132] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that: include: A pole core, one end of which is provided with a first pole lug and a second pole lug; A first current collecting disk, the first current collecting disk is arranged at the one end of the pole core, and the first current collecting disk is connected to the first pole lug; A second current collecting disk, wherein the second current collecting disk is arranged at the one end of the pole core, the second current collecting disk is connected to the second pole lug, and at least one of the second current collecting disk and the first current collecting disk is a single-layer structural member.

2. The battery cell according to claim 1, characterized in that: The first current collecting disk is located on a side of the first pole tab away from the pole core, and the second current collecting disk is located on a side of the second pole tab away from the pole core.

3. The battery cell according to claim 1, characterized in that: The second current collecting plate comprises: a first connecting portion, wherein the second current collecting plate is connected to the second electrode tab via the first connecting portion; a second connecting portion, the second connecting portion being arranged on a side of the first connecting portion away from the second electrode tab; A third connection portion, wherein the third connection portion is connected to a side of the second connection portion away from the first connection portion.

4. The battery cell according to claim 3, characterized in that: The first connection portion and the third connection portion both extend in a direction perpendicular to the central axis of the pole core, and the second connection portion is vertically connected between the first connection portion and the third connection portion.

5. The battery cell according to claim 3, characterized in that: The first connection portion includes two first sub-connection portions arranged at intervals, each of the first sub-connection portions includes a first side edge and a second side edge, the first side edge and the second side edge are not on the same plane, the first side edges of the two first sub-connection portions are opposite to each other, and the second side edges of the two first sub-connection portions are located on the same straight line; The second connection portion includes two second sub-connection portions arranged at intervals, wherein one side of one of the second sub-connection portions is connected to the first side edge and the second side edge of one of the first sub-connection portions, and one side of another of the second sub-connection portions is connected to the first side edge and the second side edge of another of the first sub-connection portions; The third connection portion includes a third sub-connection portion and a fourth sub-connection portion, the third sub-connection portion is connected between the other side of the two second sub-connection portions opposite to the first side edges of the two first sub-connection portions, one side of the fourth sub-connection portion is connected to the other side of the two second sub-connection portions opposite to the second side edges of the two first sub-connection portions and the third sub-connection portion, and the other side of the fourth sub-connection portion extends in a direction away from the first connection portion.

6. The battery cell according to claim 5, characterized in that: The first side edge and the second side edge are perpendicular to each other.

7. The battery cell according to claim 5, characterized in that: The second current collecting plate is symmetrically arranged with respect to an extending direction of the third sub-connecting portion.

8. The battery cell according to claim 3, characterized in that: The minimum distance between the first connecting portion and the central axis of the pole core is d1, wherein d1 satisfies: 2mm≤d1≤7.7mm.

9. The battery cell according to claim 3, characterized in that: The first connection portion is located radially inward of the outer periphery of the pole core, and a distance between the first connection portion and the outer periphery of the pole core is d2, wherein d2 satisfies: 0.5 mm ≤ d2 ≤ 2 mm.

10. The battery cell according to claim 1, characterized in that: The second current collecting plate is a negative electrode current collecting plate, and the second current collecting plate is a stamped part made of steel or copper.

11. The battery cell according to claim 1, characterized in that: A connection protrusion is provided on a surface of one side of the first current collecting disk adjacent to the first pole lug, and the first current collecting disk is connected to the first pole lug via the connection protrusion.

12. The battery cell according to claim 11, characterized in that: The connecting protrusion includes a first protrusion portion and a second protrusion portion, one end of the first protrusion portion is connected to one end of the second protrusion portion, and the other end of the first protrusion portion and the other end of the second protrusion portion extend in a direction away from each other.

13. The battery cell according to claim 12, characterized in that: An included angle between the first protrusion and the second protrusion is β, wherein β satisfies: 20°≤β≤80°.

14. The battery cell according to claim 12, characterized in that: The one end of the first protrusion and the one end of the second protrusion are adjacent to the center of the one end of the pole core, and the other end of the first protrusion and the other end of the second protrusion extend in a direction away from the center of the one end of the pole core and penetrate the outer periphery of the first current collecting plate.

15. The battery cell according to claim 12, characterized in that: A notch is formed at a central edge of the end of the first current collecting plate away from the pole core.

16. The battery cell according to claim 15, characterized in that: The notch is located between the other end of the first protrusion and the other end of the second protrusion.

17. The battery cell according to claim 11, characterized in that: The minimum distance between the connecting protrusion and the central axis of the pole core is d3, wherein d3 satisfies: 2mm≤d3≤8mm.

18. The battery cell according to claim 11, characterized in that: The connecting protrusion is formed by a portion of a side surface of the first current collecting plate away from the first electrode tab protruding toward a side surface adjacent to the first electrode tab.

19. The battery cell according to claim 18, characterized in that: The connection protrusion forms a groove on the surface of the first current collecting plate away from the first pole lug to form the connection protrusion on the surface of the first pole lug, and the depth of the groove is h, wherein h satisfies: 0mm<h≤2mm.

20. The battery cell according to claim 1, characterized in that: The minimum distance between the side of the first current collecting disk away from the central axis of the pole core and the outer peripheral surface of the pole core is d4, wherein d4 satisfies: 0.5mm≤d4≤2mm.

21. The battery cell according to claim 1, characterized in that: The first current collecting disc is a positive electrode current collecting disc, and the first current collecting disc is a stamped aluminum sheet part.

22. The battery cell according to any one of claims 1 to 21, characterized in that: Further including: A cover plate assembly is arranged on a side of the first current collecting disk away from the pole core.

23. The battery cell according to claim 22, characterized in that: The cover plate assembly comprises: A cover plate body, wherein the second current collecting plate is connected to the cover plate body; A positive electrode column, wherein the positive electrode column is passed through the cover body, the positive electrode column is insulated and connected to the cover body, and the first current collecting plate is connected to the positive electrode column.

24. The battery cell according to claim 23, characterized in that: The positive electrode column comprises a first electrode column section and a second electrode column section connected to each other, and the first electrode column section is penetrated on the cover plate body; The cover plate assembly further comprises: An insulating spacer is provided between the cover plate body and the second pole segment.

25. The battery cell according to claim 24, characterized in that: A rotation-stop groove is formed on the insulating partition, and the second pole section is fitted in the rotation-stop groove; The first current collecting plate is provided with a matching portion extending toward the anti-rotation groove, the matching portion is matched in the anti-rotation groove, and the matching portion is located on a side of the second pole segment away from the cover plate body.

26. The battery cell according to claim 25, characterized in that: A stop protrusion is provided on a surface of one side of the insulating separator adjacent to the first current collecting disk, and the stop protrusion and the surface of one side of the insulating separator adjacent to the first current collecting disk together define the stop groove, and the side of the stop groove adjacent to the center of the first current collecting disk is open.

27. The battery cell according to claim 23, characterized in that: The second current collecting plate is interference-fitted between the second pole lug and the cover plate body.

28. The battery cell according to claim 23, characterized in that: The height of the second current collecting plate is h1, and the distance between the side surface of the cover plate body facing the first current collecting plate and the side surface of the first current collecting plate away from the cover plate is h2, wherein h1 and h2 satisfy: 0mm≤h1-h2≤1mm.

29. A battery, characterized in that: Comprising a battery cell according to any one of claims 1-28.

30. A battery module, characterized in that: Comprising a battery according to claim 29.

31. A battery pack, characterized in that: Comprising the battery according to claim 29 or the battery module according to claim 30.

32. An electrical device, characterized in that: Comprising a battery pack according to claim 31.

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